\r\n\tIn sum, the book presents a reflective analysis of the pedagogical hubs for a changing world, considering the most fundamental areas of the current contingencies in education.
",isbn:"978-1-83968-793-8",printIsbn:"978-1-83968-792-1",pdfIsbn:"978-1-83968-794-5",doi:null,price:0,priceEur:0,priceUsd:0,slug:null,numberOfPages:0,isOpenForSubmission:!1,hash:"b01f9136149277b7e4cbc1e52bce78ec",bookSignature:"Dr. María Jose Hernandez-Serrano",publishedDate:null,coverURL:"https://cdn.intechopen.com/books/images_new/10229.jpg",keywords:"Teacher Digital Competences, Flipped Learning, Online Resources Design, Neuroscientific Literacy (Myths), Emotions and Learning, Multisensory Stimulation, Citizen Skills, Violence Prevention, Moral Development, Universal Design for Learning, Sensitizing on Diversity, Supportive Strategies",numberOfDownloads:null,numberOfWosCitations:0,numberOfCrossrefCitations:null,numberOfDimensionsCitations:null,numberOfTotalCitations:null,isAvailableForWebshopOrdering:!0,dateEndFirstStepPublish:"September 14th 2020",dateEndSecondStepPublish:"October 12th 2020",dateEndThirdStepPublish:"December 11th 2020",dateEndFourthStepPublish:"March 1st 2021",dateEndFifthStepPublish:"April 30th 2021",remainingDaysToSecondStep:"4 months",secondStepPassed:!0,currentStepOfPublishingProcess:4,editedByType:null,kuFlag:!1,biosketch:"Dr. Phil. Maria Jose Hernandez Serrano is a tenured lecturer in the Department of Theory and History of Education at the University of Salamanca, where she currently teaches on Teacher Education. She graduated in Social Education (2000) and Psycho-Pedagogy (2003) at the University of Salamanca. Then, she obtained her European Ph.D. in Education and Training in Virtual Environments by research with the University of Manchester, UK (2009).",coeditorOneBiosketch:null,coeditorTwoBiosketch:null,coeditorThreeBiosketch:null,coeditorFourBiosketch:null,coeditorFiveBiosketch:null,editors:[{id:"187893",title:"Dr.",name:"María Jose",middleName:null,surname:"Hernandez-Serrano",slug:"maria-jose-hernandez-serrano",fullName:"María Jose Hernandez-Serrano",profilePictureURL:"https://mts.intechopen.com/storage/users/187893/images/system/187893.jpg",biography:"DPhil Maria Jose Hernandez Serrano is a tenured Lecturer in the Department of Theory and History of Education at the University of Salamanca (Spain), where she currently teaches on Teacher Education. She graduated in Social Education (2000) and Psycho-Pedagogy (2003) at the University of Salamanca. Then, she obtained her European Ph.D. on Education and Training in Virtual Environments by research with the University of Manchester, UK (2009). She obtained a Visiting Scholar Postdoctoral Grant (of the British Academy, UK) at the Oxford Internet Institute of the University of Oxford (2011) and was granted with a postdoctoral research (in 2021) at London Birbeck University.\n \nShe is author of more than 20 research papers, and more than 35 book chapters (H Index 10). She is interested in the study of the educational process and the analysis of cognitive and affective processes in the context of neuroeducation and neurotechnologies, along with the study of social contingencies affecting the educational institutions and requiring new skills for educators.\n\nHer publications are mainly of the educational process mediated by technologies and digital competences. Currently, her new research interests are: the transdisciplinary application of the brain-based research to the educational context and virtual environments, and the neuropedagogical implications of the technologies on the development of the brain in younger students. Also, she is interested in the promotion of creative and critical uses of digital technologies, the emerging uses of social media and transmedia, and the informal learning through technologies.\n\nShe is a member of several research Networks and Scientific Committees in international journals on Educational Technologies and Educommunication, and collaborates as a reviewer in several prestigious journals (see public profile in Publons).\n\nUntil March 2010 she was in charge of the Adult University of Salamanca, by coordinating teaching activities of more than a thousand adult students. She currently is, since 2014, the Secretary of the Department of Theory and History of Education. Since 2015 she collaborates with the Council Educational Program by training teachers and families in the translation of advances from educational neuroscience.",institutionString:"University of Salamanca",position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"0",totalChapterViews:"0",totalEditedBooks:"0",institution:{name:"University of Salamanca",institutionURL:null,country:{name:"Spain"}}}],coeditorOne:null,coeditorTwo:null,coeditorThree:null,coeditorFour:null,coeditorFive:null,topics:[{id:"23",title:"Social Sciences",slug:"social-sciences"}],chapters:null,productType:{id:"1",title:"Edited Volume",chapterContentType:"chapter",authoredCaption:"Edited by"},personalPublishingAssistant:{id:"301331",firstName:"Mia",lastName:"Vulovic",middleName:null,title:"Mrs.",imageUrl:"https://mts.intechopen.com/storage/users/301331/images/8498_n.jpg",email:"mia.v@intechopen.com",biography:"As an Author Service Manager, my responsibilities include monitoring and facilitating all publishing activities for authors and editors. From chapter submission and review to approval and revision, copyediting and design, until final publication, I work closely with authors and editors to ensure a simple and easy publishing process. I maintain constant and effective communication with authors, editors and reviewers, which allows for a level of personal support that enables contributors to fully commit and concentrate on the chapters they are writing, editing, or reviewing. I assist authors in the preparation of their full chapter submissions and track important deadlines and ensure they are met. I help to coordinate internal processes such as linguistic review, and monitor the technical aspects of the process. As an ASM I am also involved in the acquisition of editors. Whether that be identifying an exceptional author and proposing an editorship collaboration, or contacting researchers who would like the opportunity to work with IntechOpen, I establish and help manage author and editor acquisition and contact."}},relatedBooks:[{type:"book",id:"6942",title:"Global Social Work",subtitle:"Cutting Edge Issues and Critical Reflections",isOpenForSubmission:!1,hash:"222c8a66edfc7a4a6537af7565bcb3de",slug:"global-social-work-cutting-edge-issues-and-critical-reflections",bookSignature:"Bala Raju Nikku",coverURL:"https://cdn.intechopen.com/books/images_new/6942.jpg",editedByType:"Edited by",editors:[{id:"263576",title:"Dr.",name:"Bala",surname:"Nikku",slug:"bala-nikku",fullName:"Bala Nikku"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"1591",title:"Infrared Spectroscopy",subtitle:"Materials Science, Engineering and Technology",isOpenForSubmission:!1,hash:"99b4b7b71a8caeb693ed762b40b017f4",slug:"infrared-spectroscopy-materials-science-engineering-and-technology",bookSignature:"Theophile Theophanides",coverURL:"https://cdn.intechopen.com/books/images_new/1591.jpg",editedByType:"Edited by",editors:[{id:"37194",title:"Dr.",name:"Theophanides",surname:"Theophile",slug:"theophanides-theophile",fullName:"Theophanides Theophile"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"3092",title:"Anopheles mosquitoes",subtitle:"New insights into malaria vectors",isOpenForSubmission:!1,hash:"c9e622485316d5e296288bf24d2b0d64",slug:"anopheles-mosquitoes-new-insights-into-malaria-vectors",bookSignature:"Sylvie Manguin",coverURL:"https://cdn.intechopen.com/books/images_new/3092.jpg",editedByType:"Edited by",editors:[{id:"50017",title:"Prof.",name:"Sylvie",surname:"Manguin",slug:"sylvie-manguin",fullName:"Sylvie Manguin"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"3161",title:"Frontiers in Guided Wave Optics and Optoelectronics",subtitle:null,isOpenForSubmission:!1,hash:"deb44e9c99f82bbce1083abea743146c",slug:"frontiers-in-guided-wave-optics-and-optoelectronics",bookSignature:"Bishnu Pal",coverURL:"https://cdn.intechopen.com/books/images_new/3161.jpg",editedByType:"Edited by",editors:[{id:"4782",title:"Prof.",name:"Bishnu",surname:"Pal",slug:"bishnu-pal",fullName:"Bishnu Pal"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"72",title:"Ionic Liquids",subtitle:"Theory, Properties, New Approaches",isOpenForSubmission:!1,hash:"d94ffa3cfa10505e3b1d676d46fcd3f5",slug:"ionic-liquids-theory-properties-new-approaches",bookSignature:"Alexander Kokorin",coverURL:"https://cdn.intechopen.com/books/images_new/72.jpg",editedByType:"Edited by",editors:[{id:"19816",title:"Prof.",name:"Alexander",surname:"Kokorin",slug:"alexander-kokorin",fullName:"Alexander Kokorin"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"1373",title:"Ionic Liquids",subtitle:"Applications and Perspectives",isOpenForSubmission:!1,hash:"5e9ae5ae9167cde4b344e499a792c41c",slug:"ionic-liquids-applications-and-perspectives",bookSignature:"Alexander Kokorin",coverURL:"https://cdn.intechopen.com/books/images_new/1373.jpg",editedByType:"Edited by",editors:[{id:"19816",title:"Prof.",name:"Alexander",surname:"Kokorin",slug:"alexander-kokorin",fullName:"Alexander Kokorin"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"57",title:"Physics and Applications of Graphene",subtitle:"Experiments",isOpenForSubmission:!1,hash:"0e6622a71cf4f02f45bfdd5691e1189a",slug:"physics-and-applications-of-graphene-experiments",bookSignature:"Sergey Mikhailov",coverURL:"https://cdn.intechopen.com/books/images_new/57.jpg",editedByType:"Edited by",editors:[{id:"16042",title:"Dr.",name:"Sergey",surname:"Mikhailov",slug:"sergey-mikhailov",fullName:"Sergey Mikhailov"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"371",title:"Abiotic Stress in Plants",subtitle:"Mechanisms and Adaptations",isOpenForSubmission:!1,hash:"588466f487e307619849d72389178a74",slug:"abiotic-stress-in-plants-mechanisms-and-adaptations",bookSignature:"Arun Shanker and B. Venkateswarlu",coverURL:"https://cdn.intechopen.com/books/images_new/371.jpg",editedByType:"Edited by",editors:[{id:"58592",title:"Dr.",name:"Arun",surname:"Shanker",slug:"arun-shanker",fullName:"Arun Shanker"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"878",title:"Phytochemicals",subtitle:"A Global Perspective of Their Role in Nutrition and Health",isOpenForSubmission:!1,hash:"ec77671f63975ef2d16192897deb6835",slug:"phytochemicals-a-global-perspective-of-their-role-in-nutrition-and-health",bookSignature:"Venketeshwer Rao",coverURL:"https://cdn.intechopen.com/books/images_new/878.jpg",editedByType:"Edited by",editors:[{id:"82663",title:"Dr.",name:"Venketeshwer",surname:"Rao",slug:"venketeshwer-rao",fullName:"Venketeshwer Rao"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"4816",title:"Face Recognition",subtitle:null,isOpenForSubmission:!1,hash:"146063b5359146b7718ea86bad47c8eb",slug:"face_recognition",bookSignature:"Kresimir Delac and Mislav Grgic",coverURL:"https://cdn.intechopen.com/books/images_new/4816.jpg",editedByType:"Edited by",editors:[{id:"528",title:"Dr.",name:"Kresimir",surname:"Delac",slug:"kresimir-delac",fullName:"Kresimir Delac"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}]},chapter:{item:{type:"chapter",id:"44691",title:"Microseismic Monitoring Developments in Hydraulic Fracture Stimulation",doi:"10.5772/56444",slug:"microseismic-monitoring-developments-in-hydraulic-fracture-stimulation",body:'Microseismic events are very small earthquakes of generally negative moment magnitude[1] - that are often associated with hydraulic fracturing or fluid flow in reservoirs. Building upon long-standing applications of microseismic methods, such as monitoring of stability in underground mines (e.g., Gibowicz and Kijko, 1994; Urbancic and Trifu, 2000) and enhanced geothermal systems (e.g., Häring et al., 2008), microseismic monitoring techniques are being used increasingly by the oil and gas industry to monitor hydraulic stimulation of "tight" (very low permeability) hydrocarbon reservoirs and steam injection into heavy-oil fields. As such, it is one of the technologies underpinning the recent upswing of oil production in Western Canada, as well as the development of new tight-gas fields, monitoring of caprock integrity during in situ heavy-oil exploitation, and carbon capture and storage (McGillivray, 2005; Maxwell et al., 2010; Verdon et al., 2010; Maxwell, 2011; Clarkson et al., 2011).
This paper reviews some of the current questions and research in microseismicity, ranging from acquisition, processing to interpretation. However, before reviewing these aspects, it is important to consider the wider context first and the economic impact of hydraulic fracturing in tight-hydrocarbon fields.
Security of energy supplies, the continuous growth in energy demand, and climate change are among the greatest global challenges that we face. Nearly all projections agree that we will remain heavily reliant on fossil fuels for many years. For example, the International Energy Agency’s ‘business-as-usual’ analysis from 2008 indicates that in 2030 approximately 83% of the world’s energy demand will still be met by fossil fuels. In 2011 this was revised downward to 55% due to high oil prices, government incentives for renewable energies and environmental concerns (EIA, 2011). Technological innovations will therefore be required to (i) find new hydrocarbon reserves or enable recovery from proven resources previously inaccessible or uneconomic; (ii) maximize recovery from producing reservoirs, and (iii) deal with CO2 emissions. Microseismic monitoring and hydraulic fracturing are mainly related to the first two points.
Recovery of hydrocarbons from previously uneconomic yet proven resources such as shale-gas and other tight-gas plays has become possible due to significant improvements in the last 10 years in two key technologies, namely horizontal drilling and hydraulic fracturing. Tight-gas reservoirs are characterized by low porosity and permeability, indicating that little pore space is present and that fluid flow is guaranteed to be slow and difficult, thus severely complicating reservoir drainage. On the other hand, this gas is often located in very thick lithologic units such that the resource volume is large. Horizontal drilling into these units enables drainage over a larger well contact area (2-3 km instead of 100-200m), thus improving fluid flow. In hydraulic-fracture well treatments, fluids possibly mixed with proppants (slurry) are injected under high pressure to induce fracturing of the reservoir, thereby further enhancing reservoir drainage by increasing the effective permeability through the creation of an interconnected fracture network.
The technological advances in these two key technologies have been such that in 2000 only 1% of the total gas production in the US came from shale-gas fields, whereas currently this is estimated to be 20% (IHS CERA, 2010). Figure 1 shows the extent of current and potential shale-gas plays in North America. It is clear that tight-gas and shale gas will remain an important resource for many years to come and further technological improvements will enable economic drainage of additional reservoirs. One of these emerging technologies is microseismic monitoring.
Current shale plays in North America. Source: EIA http://www.eia.gov/pub/oil_gas/natural_gas/analysis_publications/maps/maps.htm
Hydraulic fracturing (also known as fraccing or fracking) leads to brittle failure inside a reservoir, which is typically accompanied by microseismicity. Microseismicity refers to discrete rock-deformation events, analogous to tiny earthquakes, that are generally of moment magnitude < 0. For reference, magnitude 0.2 is the equivalent of the energy released by a large hand grenade (30 g TNT equivalent), whereas a typical small mining blast has a magnitude around 1-1.5, corresponding to 2-2.5kg of TNT. Since magnitude scales are logarithmic, negative magnitude events thus correspond to the energy yield equivalent of milligrams or even micrograms of TNT.
Monitoring of microseismic activity is a geophysical remote-sensing technology that provides the ability to detect and map associated fracturing processes, either in real-time or in post-processing mode. A typical field deployment involves the installation of an array of continuous-recording 3-component geophones within observation well(s) near the zone of interest, and/or a large number of surface sensors. Although relatively new to the oil and gas industry, similar monitoring technologies for earthquakes have been honed and developed by the seismological and mining research communities for decades (e.g. Gibowicz and Kijko, 1994; Bolt, 1984; Stein and Wysession, 2003). The goal of microseismic monitoring is to detect, locate and characterize microseismic events, which often occur in large numbers within cloud-like distributions that reflect underlying fracture networks. This approach enables monitoring of frac treatments in real-time in order to detect the extent of the stimulated rock volume and thus the success of the treatment, as well as predict likely improvements in subsequent reservoir drainage.
Applications of microseismic monitoring within industry, particularly in oil and gas, have seen remarkable growth during the past 10 years (Warpinski, 2009; Maxwell, 2010). This has not been limited to hydraulic fracture treatment for shale-gas and other tight-gas plays, but has included stimulation technologies such as fracturing or steam injection applied to tight-oil or heavy-oil fields and also techniques for maximizing recovery from producing reservoirs. It is estimated that over one million hydraulic fracture treatments have been performed in the US in the past 60 years (King, 2012), and that currently 3-5% of fracs in North America involve microseismic monitoring. Oil and gas companies have made significant expenditures (conservatively $100’s MM) for microseismic monitoring, but face extraordinary technological challenges to fully utilize the results. Their efforts are hampered by a number of factors, including an incomplete understanding of seismological and geomechanical processes associated with induced microseismicity.
In the next sections we will review current pertinent research questions on microseismic acquisition, processing and interpretation. Since many items are intimately intertwined it is inescapable that some points may be revisited throughout the chapter.
Based on the current state-of-the-art for microseismic monitoring, a number of important technological questions are presently under debate, such as:
What conditions favour surface versus borehole microseismic acquisition? Surface acquisition involves the deployment of large numbers of receivers and has the inherent advantage of more extensive azimuthal coverage (solid angle); in principle, this should improve the condition number for hypocentre inversion and moment-tensor analysis (Eaton and Forouhideh, 2011). On the other hand, placement of geophones in deep boreholes (currently the norm for microseismic monitoring in western Canada) has the advantage of better signal-to-noise characteristics due to the closer proximity to the microseismic sources, generally quieter background noise levels (less anthropogenic noise), often better instrument coupling and predominantly horizontal (layer-parallel) instead of vertical (layer-perpendicular) wave propagation leading to less wave scattering. Conversely, surface acquisition is significantly more cost effective as there is no need to drill observation wells or deploy instrumentation inside wells, and permits deployment of one or two orders of magnitudes more instruments.
The current strategy for hydraulic fracturing of tight-gas reservoirs is to minimize acquisition durations to reduce costs. Recently recognized phenomena, such as long-period long-duration events (Das and Zoback, 2011), indicate that much can be learned from the use of exceptionally long deployment times (i.e., weeks rather than days) in order to enable more complete characterization of background noise spectra. Such long recording durations would also enable the evaluation of technology for noise interferometry (cf. de Ridder and Delinger, 2011) to reveal not only what happens during stimulation, but also in the period before and immediately following the slurry injection.
Various formulas are currently used within industry to calculate the magnitude of microseismic events (Shemata and Anderson, 2010). Since magnitude formulas were developed for describing earthquake phenomena, they are calibrated for significantly larger magnitudes. The extrapolation of different formulas to 4-5 orders of magnitude below their calibration range leads to discrepancies in reported values. Accurate magnitude determination is of practical importance for various reasons, including (i) the determination of the stimulated rock volume (Maxwell et al., 2006); (ii) recently implemented controls in the UK on hydraulic fracturing operations are based on a “traffic-light system” (de Pater and Baisch, 2011) in which operations are suspended for several days if any event exceeds ML = 0, and stopped if any event exceeds ML = 1.7; and (iii) on liability issues related to induced seismicity (Cypster and Davis, 1998).
Currently the emphasis is on mapping brittle failure, yet it is hypothesized that the cumulative energy released via brittle failure represents only a minute fraction of the total injected energy, indicating that a large portion of energy release may occur aseismically (i.e., plastically or at very slow deformation rates) (Maxwell et al., 2009). This suggests that there may be an advantage to acquisition of continuous recordings for analysis of the ultra-low frequency spectral content of microseismic activity, which may be diagnostic of certain types of aseismic rock failure (Benson et al., 2008; Pettit et al., 2009; Beroza and Satoshi, 2011).
A university-led project to acquire microseismic data was undertaken in northern British Columbia, Canada. This experiment involved the recording of several multistage hydraulic fracture treatments performed in two horizontal wells (Figure 2). The microseismic data were collected using both surface and borehole sensors. The borehole tool string consisted of a 6-level broadband system with downhole digitization. Surface sensors included a 12-channel array with a mix of vertical-component and 3-C geophones, and 22 broadband sensors deployed in 7 localized arrays over an area of ~ 0.5 km2.
Experimental setup of the microseismic experiment, as well as the time-frequency transforms of stage H1-4 for one downhole geophone and one broadband station (hot colors correspond to high amplitudes). The stars indicate the position of the perforation shots and hence of the horizontal part of the wells. H1 and H2 are two different horizontal wells. After: Tary and Van der Baan (2013).
The unusual setup was designed to investigate multiple objectives. First, microseismic monitoring was performed using both surface and borehole equipment to compare acquisition strategies and determine their respective advantages and inconveniences such as ease of deployment, costs, detectability of events, other signals and associated noise levels. In addition, the experiment is unique in that both broadband and short-period equipment are deployed. The approximate lowest recording frequencies for the various equipment are; broadband surface-based seismometers: 0.0083 Hz (= 120 s); borehole equipment: 0.1 Hz; short-period surface array: 5 Hz. Data analysis of the variously recorded signal thus helps reveal if significant energy is present below the 5 Hz limit imposed by most standard monitoring equipment. This may help resolve the observed energy imbalance between injected and seismically released energy.
Conventional analysis of microseismic recordings involves first identifying and extracting individual events, e.g., via a semi-automatic triggering system. This poses problems if many overlapping events are simultaneously recorded and if individual event strengths hover around the noise level. It also may obscure proper identification of so-called slow earthquakes (Ide et al., 2007) occurring on much longer time scales than conventional earthquakes resulting from abrupt brittle failure.
Direct analysis of continuous data streams on the other hand offers much greater flexibility and is not subject to the shortcomings described above. For instance, analysis of continuous recordings of acoustic emissions generated during laboratory rock-fracturing experiments have greatly aided in improving our understanding of active microcracking and deformation processes in volcanoes and the earth in general (Benson et al., 2008; Thompson et al., 2009). These continuous data streams are analyzed using various time-frequency transforms such as short-time Fourier transforms, S-transforms and wavelet transforms (Reine et al., 2009) to examine variations in local frequency content and highlight slow deformation processes. Obviously it remains possible to dissect the recordings to extract individual events as well.
Initial analysis of these data reveals the existence of numerous high-frequency (> 100 Hz) microseismic events with moment magnitudes ranging from -2.3 to -1.4. These events are detected to distances of up to 1.2 km using the borehole system. In addition, perforation shots are well recorded to distances of about 2 km. More interestingly spectral analysis shows the existence of complex rupture patterns such as rapid opening and closing of tensile cracks (Eaton, 2012). Moment tensor analysis on other experiments has shown complex deformation as well in hydraulic-fracturing experiments (Baig and Urbancic, 2010); yet such moment-tensor analysis normally requires two or more observation wells (Eaton and Forouhideh, 2011). The current observations are obtained using a single observation well.
Time-frequency analysis of the continuous recordings demonstrates the existence of resonance frequencies during hydraulic fracturing (Tary and Van der Baan, 2013). The resonances are mainly in the frequency band between 5 and 20 Hz. Other resonances are visible on the broadband recordings. They likely correspond to environmental or anthropogenic noises. Noticeably, the resonances are recorded by the downhole geophones, which are close to the horizontal part of the injection well at depth, and by the broadband arrays A and B, which are near the well head. The broadband arrays C or D, closest to the fluid injection during the first stages, do not exhibit any resonance frequencies. This indicates that the injection well is likely the cause of these resonance frequencies (Figure 2). In other cases, however, resonance frequencies may be indicative of the extent of the induced, interconnected fracture network (Tary and Van der Baan, 2012).
It is clear from the above discussion that many key acquisition questions are intimately linked to the need to enhance our arsenal of tools for processing and interpretation of microseismic data.
Rapid turnaround has been a high priority within the microseismic industry to reduce acquisition durations and deliver analysis results such as event locations in near real-time to completion engineers, who are required to make decisions such as starting a new fracturing stage based on assessment of a microseismic event “cloud” distribution. This requirement has led to the development of near real-time event-picking, classification and hypocentre-location algorithms; such rapid turnarounds demand robust techniques based on straightforward assumptions, often accompanied by large reductions in information content. For instance, in the case of hydraulic fracture stimulations, the fracture size and orientation are often inferred using a few events comprising the edges of the “cloud” of microseismic hypocentres.
Before discussing picking and event location it is important to realize that a principal aspect of microseismic data processing is the recognition and attenuation of coherent noise. Coherent noise is defined here as any repeatedly recorded energy on one or more traces that is not a body wave (P or S) arrival. The noise is often persistent, repeatable, and may be caused by various types of waves travelling in the borehole. A cemented wellbore with steel casing has the potential to propagate many types of waves. P and S waves can be transmitted in a wellbore in the steel casing, or the cement (Raggio et. al., 2007). The P wave can also be transmitted in the fluid in the wellbore. There are also a number of modes of tube waves (Rayleigh waves travelling at the wellbore fluid and adjacent solid interface) that can be transmitted.
St-Onge and Eaton (2011) have observed another type of coherent noise source that may be related to the tuned response of a clamped geophone array. This response is manifested as discrete, high-amplitude spectral peaks that can have a negative effect on weak signals recorded within the primary bandwidth of borehole microseismic recordings (i.e., several hundred Hz). These observations show that noise can be high in amplitude, persistent in time, and may adversely affect the recording of P and S wave signal energy in microseismic data (St-Onge and Eaton, 2011). Due to the nature of the data acquisition, the types of noise observed in microseismic surveys differ from typical noise sources in conventional seismic profiling. In many cases, datasets are contaminated by Lamb waves, which are a type of elastic guided wave that travels along a plate surface such as the cylindrical surface of borehole casing. These coupled longitudinal and transverse waves were first described by Lamb (1917) and in a cylindrical casing exhibit longitudinal, torsional and flexural modes. Lamb waves are dispersive, and their frequency characteristics have been described by Karpfinger (2009). St-Onge and Eaton (Lamb waves recorded in wellbores and their potential to predict cement bond failure, in preparation for Geophysics) are exploring various ways in which these harmonic signals can be suppressed or even exploited to characterize the borehole environment as their propagation velocity is influenced by the bonding characteristics of the cement.
Tary and Van der Baan (2012) divide resonance frequencies into three broad categories, namely those generated by source, receiver or path effects. This categorization can also be applied to microseismic noise if we are interested solely in the microseismic direct arrivals for location purposes and estimation of the associated source mechanism. At the receiver side, resonance frequencies and other noise result from wave reverberations in the borehole (Sun and McMechan, 1988), either the whole borehole or between secondary sources such as the geophones (St-Onge and Eaton, 2011). Resonances and noise can also be due to internal resonance of the geophone if its clamping or damping is flawed.
Along the ray path, resonances arise from constructive and destructive interferences of seismic waves, waves focusing in low-velocity waveguides or multiple wave scattering. Which frequency band is favored depends on the layer spacing, thickness and mechanical properties (van der Baan et al., 2007, van der Baan, 2009). Likewise (multiple) reflections and refractions can also confound the picking of direct arrivals. A prime example on how such secondary arrivals can complicate event picking and location is shown in Kocon and Van der Baan (2012) who demonstrate that mis-identification of arrivals is a prominent source of event mislocations.
At the source side, resonance frequencies can be generated by repetitive events if perfectly periodic, or by the resonance of fluid-filled cracks as in the case of volcanic tremors (Aki et al., 1977). Resonances in fluid-filled cracks are generated by interface waves and depend mainly on the crack geometry, the crack stiffness and the source parameters that trigger the resonance (Ferrazzini and Aki, 1987). The latter are significantly less likely to mask strong direct arrivals; yet they offer promise for enhancing our understanding of the geomechanical reservoir deformations during hydraulic fracturing (Tary and Van der Baan, 2012, 2013) as indicated in the previous section.
Event-detection and time-picking are critical steps for microseismic data processing. Due to the large volume of data acquired during a microseismic survey, these steps are typically performed using an automated method. These steps have been implemented using various algorithms, such as the short- and long-time average ratio (STA/LTA) technique (e.g. Sharma et al., 2010), modified energy-ratio (MER) (Han et al., 2009) and Akaike information criterion (AIC) (Oye and Roth, 2003). Akram et al. (Automatic event-detection and time-picking algorithms for downhole microseismic data processing, manuscript in preparation for Geophysical Prospecting) have developed a dynamic-threshold approach for event detection that reduces false detections and offers improved capability to identify weak signals. They have also developed several hybrid approaches for automatic arrival-time picking that combine existing methods to improve performance with real microseismic data.
Calculation and interpretation of the locations of seismic events (hypocentres) are critical first-order components of microseismic monitoring. Compared to conventional earthquake methods, borehole microseismic surveys are relatively poorly constrained because of the fewer number of geophones and less desirable azimuthal coverage (Han, 2010; Jones et al., 2010). Most hypocentre localization methods require knowledge of P- and S-wave arrival times (Xuan and Sava, 2009). For borehole microseismic surveys, the distance between source and receiver can be computed using the arrival time difference of P- and S- waves and azimuth and dip information obtained from polarization analysis (Albright and Pearson, 1982; Eisner et al., 2009; Han, 2010; Jones et al., 2010). A probability density function can also be computed from the observed and modeled arrival time delays of P- and S-waves (Michaud et al., 2004). Surface microseismic methods are better suited to migration-based methods, which do not require P- and S-wave arrivals time picking information and can locate weak events by focusing energy at the source using time reversal (Gajewski, 2005; Chambers et al., 2009; Fu and Luo, 2009; Xuan and Sava, 2009). The drawbacks of the migration-based methods include high computational cost and their requirement of data redundancy (Xuan and Sava, 2009; Han, 2010). A semblance-weighted stacking method can also be used for microseismic source location, where the maximum value of the product of P- and S-wave semblances on a time window define the location of microseismic source (Eaton et al., 2011).
There are also several techniques (for example, hypocentroidal decomposition and double-difference tomography), which determine the relative location of the seismic source (Shearer, 1999). It has been recognized that the near real-time hypocentre locations may have large associated uncertainties, preventing high-resolution post-treatment interpretation (Figure 3). A first concern is that different service companies may obtain different event locations, even for the same dataset. This is caused by fundamental uncertainties in how to determine the most appropriate velocity model, the use of different event location algorithms but also elemental problems on how to pick consistently P- and S-wave arrivals in large datasets (sometimes consisting of 1000s of events recorded by 10s or 100s of 3-component receivers).
Much current research focuses on improved workflows for direct estimation of absolute hypocentres and on accurate relative event locations. Multiplet analysis can for instance be used to address the issues of unknown velocity models as well as inconsistent picking on final event locations (De Meersman et al., 2009; Kocon and Van der Baan, 2012). A doublet is a pair of events produced by nearly identical source mechanisms from closely spaced locations; a multiplet is a group of three or more of such events. The waveforms of multiplets are nearly identical, with the principal exception of additive random noise. Multiplets can be readily identified using cross correlation (Poupinet et al. 1984; Arrowsmith and Eisner, 2006). All events in each multiplet group are then relocated to improve their relative location accuracy (Figure 3), thereby revealing lineations and active faults planes.
Microseismic events contain a wealth of information that can be used to determine planes of weakness along which fluid migration could occur. (a) Original source locations; (b) new source locations after application of a high-resolution relocation technique; (c) multiplets extracted and best fault plane solutions depicted in two major clusters; (d) obtained fault planes overlain onto the top-reservoir fault map interpreted from 3D surface seismic data (after De Meersman et al., 2009).
This approach has two important advantages. First the method is rather insensitive to the chosen velocity model since any inaccuracies will not obscure revealed geologic features but only change their size (Got, 1994, De Meersman et al., 2009). Secondly, mispicks and missing picks are automatically corrected for via the cross-correlation procedure. In addition, a crossplot of waveform correlation coefficients versus hypocentre separation distances of every event pair automatically reveals hypocentre location errors by examining location distances of identified multiplets. This technique enabled Kocon and Van der Baan (2012) to ascertain that events could be mislocated by 350m in a heavy-oil dataset due to erroneous traveltime picks.
Once the multiplet groups are detected, the double-difference method can be applied. This is a relative relocation method that seeks to reduce the effects of errors due to unanticipated velocity heterogeneities in the structure (Waldhauser and Ellsworth, 2000). An advantage of this method is that no master event is needed, which induces spatial limitations, since all events must be correlated with the reference event. The main assumption in this method is that ray paths between two events will be very similar if their hypocentral separation is small compared to the source-receiver distances; therefore, the relative travel-time difference at a common station will be mainly due to the spatial offset between both events. In other words, the effects of most velocity heterogeneities will cancel out, such that only knowledge of the velocities in the source region is required. Castellanos and Van der Baan (2012) apply this method to data from a mining environment. Results clearly reveal a linear feature after relocation, possibly related to horizontal drilling activities.
Likewise, De Meersman et al. (2009) use relative locations to delineate a graben-like extensional structure in the caprock of a producing reservoir in the North Sea, UK (Figure 3). This graben-like structure was not visible in the original absolute locations which revealed solely two large microseismic clusters. Next they re-examine temporal changes in anisotropy as found by Teanby et al. (2004a) using the automated shear-wave splitting methodology of Teanby et al. (2004b) for this same dataset. They then argue that their integrated analysis of relocated sources, seismic multiplets, and S-wave splitting supports a model whereby stresses in this reservoir recharge cyclically. Effective stress builds up in response to reservoir compaction as a result of oil production, and stress is released by means of microseismic activity once criticality is reached on slip planes. These changes cause variations in seismic anisotropy and the microseismic source mechanisms over time.
The microseismic case studies by De Meerman et al. (2009) andCastellanos and Van der Baan (2012) do not include fluid injection; yet they already demonstrate that analysis of the microseismic cloud of event locations can reveal important insights into the local geology and subsurface deformations. Pore pressure and stress changes during hydraulic fracturing lead to a propagating cloud of microseismic events, which can be recorded and analyzed to constrain the volume of the stimulated zone. Because pressures and stresses diffuse/propagate beyond the fluid-filled fractures and affect the (generally jointed) rock mass in all directions, the microseismic cloud represents a volumetric map of the extent of shear and opening of naturally fractured rock.
A key element in current research is to develop interpretation methods that bridge the gap between geophysical data analysis and engineering applications of microseismic data. Ultimately, operators would like to know how to optimize the fracturing treatment given the in situ stress regime, dominant natural fracture orientations, pre-existing faults and other zones of weaknesses, and the prevailing lithologies. Phsyically, there exists an intimate link between the above geologic features, employed stimulation strategies and resulting microseismicity. Existing unknowns can be summarized using the following two fundamental questions: (1) Given a known stress field, geology, rock mass fabric and injection strategy, what are the most likely resulting microseismic characteristics (e.g., hypocentres, source mechanisms and magnitudes)? (2) What does measured microseismicity reveal about the existing stress field and local geomechanical properties of the rockmass? The first question involves solving the forward model (given the physical parameters, what are the resulting observations?) The second question involves solving the inversion problem (given our observations, what can we determine about the current physical state?).
From an engineering point of view, answering these questions will have an immediate impact on first creating optimal drainage and fracturing strategies and then confirming their success or failure prior to starting production. From a geophysical perspective, recorded microseismicity and integration of the results with surface seismic data should significantly enhance our understanding of the existing subsurface geologic conditions and the geomechanical behavior of the reservoir, thus providing pertinent information to the completion engineers.
Pertinent considerations include: (1) Obtaining accurate locations for microseismic events to support meaningful volumetric analysis of the associated microseismic cloud. (2) Inferring the failure mechanism (i.e., are fractures opening, closing or shearing?). (3) Determination of why failure is occurring in specific locations but not in others (why are fractures not always symmetric with respect to the injection well and what is the geomechanical behavior of the reservoir)? The last question, in particular, is difficult to answer from the recorded seismicity alone since the geomechanical behavior depends on the in-situ stress field, the local rock properties (lithologies), and any existing areas of weakness including faults, fractures and joints (Grob and Van der Baan, 2011, Chorney et al., 2012).
Robust characterization of microseismic sources has the potential to provide important information about deformation mechanisms. Borrowing from earthquake seismology, seismic moment tensors can be used to describe microseismic point sources in general terms of a set of force couples. Moment tensors can be represented in terms of source type (Hudson et al., 1989), a classification scheme that includes shear slip (double couple), dipole, compensated linear vector dipole and volumetric sources. The reliability of these classification schemes depends critically upon the use of a recording array with a suitable geometry that satisfies geometrical requirements for azimuthal coverage of the source region (Eaton and Forouhideh, 2011).
Other fundamental descriptions of microseismic sources include the seismic moment and associated energy release, in addition to spectral source characteristics that reveal the time- and spatial-scales of rupture. Recent developments in earthquake seismology suggest that rock-deformation processes commonly occur across a broad spectrum of time scales (and frequency), wherein earthquakes merely represent a high-frequency end member (e.g., Beroza and Ide, 2011). We postulate that rock deformation processes associated with hydraulic fracturing obey scaling laws that are similar to earthquakes. If so, microseismic activity recorded conventionally using geophones, which are relatively insensitive to ground motion below their natural frequency (typically ~ 10 Hz), could represent a high-frequency end member of the complete deformation spectrum.
Seismic moment-tensors provide a general mathematical representation of seismic point sources (Ben-Menahem and Singh, 2000). Inversion techniques to estimate moment tensors from seismic recordings are well developed in earthquake seismology, but are only starting to be used in microseismic monitoring applications (Baig and Urbancic, 2010). The determination of moment tensors can potentially provide useful insights into rupture processes, but care is required to ensure that survey design is adequate (Eaton and Forouhideh, 2010; 2011).
The spatial dimensions of microseismic events are encoded in the spectra of the radiated seismic waves. Microseismic events can therefore be analyzed using spectral methods (e.g. Eaton, 2011), providing an alternative approach for characterizing sources. For example, models for shear slip on a circular crack (Brune 1970, 1971; Madariaga, 1977) predict the shape of source spectra and provide scaling relationships between spectral parameters and source parameters (slip area and seismic moment). These source attributes complement those derived from moment-tensor inversion.
Tensile microseismic events are believed to play an important role during hydraulic fracture treatment of unconventional reservoirs (Baig and Urbancic, 2010). Tensile microseismic events may be associated with self-propping (remnant aperture), or wedging open of natural fractures because of the induced strain field. Walter and Brune (1993) developed a model for far-field source spectra for tensile rupture, and compared these with modeled far-field spectra for shear-slip events and showed that anomalously low S/P spectral amplitude ratios are a diagnostic characteristic of tensile rupture. Building on this approach, Eaton et al. (“Scaling relations and spectral characteristics of tensile microseisms”, manuscript in preparation for Geophysics) investigate source characteristics of microseismic events induced by hydraulic-fracturing, with application to microseismic data from the previously described multistage treatment in northeastern British Columbia. They show that although spectral estimates of magnitude are relatively unaffected by uncertainty in seismic attenuation, for typical microseismic magnitudes accurate knowledge of seismic attenuation is necessary to estimate some spectral parameters. They also document microseismic events with spectral characteristics that reflect a complex rupture pattern, such as rapid opening and closing of tensile cracks.
As indicated above, the reliability with which moment tensors can be determined depends strongly on the acquisition geometry (Eaton and Forouhideh, 2010; 2011). There is thus a need for alternative and complementary analysis methods to reveal more about the in situ stress field. Fortunately, independent information on the in situ stress field can also be obtained by analyzing the frequency-magnitude distribution of microseismic events. This is achieved by plotting the distribution of event magnitudes on a semi-log plot (Figure 4). This distribution, also called the Gutenberg-Richter relation, usually shows a power law behavior. Its linear slope gives the so-called b-value. Schorlemmer et al. (2005) have shown that this b-value changes depending on the stress regime by plotting b-values versus rake angles (indicating slip direction of the hanging wall) for a large variety of earthquakes. For a b-value less than 1, the vertical stress is the least principal compressive stress and we are in a thrust-fault regime. If the vertical stress is intermediate, the b-value will likely be around 1, indicating a strike-slip faulting regime. And if it exceeds 1, then the stress regime is extensional, with the maximum principal stress vertical, creating a normal fault regime.
The case study of Grob and Van der Baan (2011) using a microseismic dataset recorded over a heavy oil field drained using cyclic steam stimulation revealed that the in situ stress state changed from extensional to compressive with an intermediate strike-slip regime, indicating initial opening and then closing of fractures. This occurred over an 8-month period where pure injection in the first four months was followed by combined injection and production in different parts of the field (Figure 4). We postulate that analysis of the statistical b-values will provide complementary information to temporal and spatial variations in the in situ stress field as determined by moment-tensors inversions, and therefore contains a wealth of information to facilitate reservoir management.
Analysis of frequency-magnitude variations in microseismic events recorded over a heavy-oil field drained using cyclic-steam stimulation (after Grob and Van der Baan, 2011). Top: Distribution of event sizes for the whole dataset. Shown is the cumulative number of events smaller than a given magnitude. A fit on the linear part of the curve gives a b-value of 1.35 indicating overall extensional faulting. Bottom: Temporal evolution of b-values for this dataset. Three stages are visible: at the beginning high b-values larger than 1.0 (implying extensional faulting or opening of fractures) until November 2009, followed by b-values around 1.0 and finally a last stage with values around 0.65 (indicating closing of fractures or compressive faulting), starting end of January 2010. Pure steam injection took place prior to November 2009, followed by a combined injection and production in different parts of the field. The statistical analysis of frequency-magnitude variations in microseismic data provide us with invaluable information on changes in the underlying stress fields.
Various observations suggest that microseismic events tend to occur preferentially in specific lithologies only (e.g., a sand) but not in some others (e.g., a shale), even if fluids are known to traverse both lithologies in a hydraulic fracturing experiment, shown in Figure 5 (Rutledge et al., 2004, Pettitt et al., 2009). This suggests that deformation in some rock types may occur aseismically, especially in higher-permeability, ductile shales, or simply that the radiated elastic energy for microseismic events in some rock types may occur at frequencies that are too low to be detected using conventional recording systems. Moreover, anecdotal information suggests that the abundance and intensity of microseismic events may not necessarily correlate to the effectiveness of the fracture treatments (Maxwell et al., 2008; Boroumand and Eaton, 2012).
Hydraulic fracturing of a tight-gas sand. 1408 events are recorded over 5 hours. Events are colour shaded by time: green (earliest) to red (latest). Events occur in two formations with very few detected events in between. Yet the event history reveals that brittle failure occurs first in the right-most part of the bottom formation, and then suddenly jumps to the top formation indicating the presence of a possible aseismic fault. After Pettitt et al. (2009).
The concept of microseismic efficiency represents the ratio of radiated seismic energy (Vassiliou and Kanamori, 1982) to the total deformation energy. Analysis of deformation energy is being done by using pressure, rate, fluid/proppant volume and other relevant data curves produced from the surface equipment in order to calculate the total energy/work produced to generate fractures in the ground. Often substantial differences are estimated between the total input energy inferred from fluid injection rates and pressures, the fracture energy to pry apart the walls of a single very large fracture, and the radiated energy observed from recorded seismicity. The injected energy is 104–107 times larger than the estimated radiated seismic energy, and the fracture energy is inferred to be 15–40% of the input energy (Maxwell et al., 2008; Boroumand and Eaton, 2012).
The three most likely factors to dominate the geomechanical behavior of a reservoir are the local in situ stress regime, pre-existing fractures (and other zones of weaknesses), and the actual rock properties (e.g., whether they are more ductile or brittle as expressed by their Young’s modulus or Poisson’s ratio and thus the Lamé parameters). In order to better understand why the seismic efficiency is so low, and what precisely happens when we are injecting fluids at high pressures into rocks we need to improve our understanding of what the various geophysical observations (moment tensors, hypocentres, resonance frequencies, etc.) truly reveal of the newly induced fracture networks specifically, and the geomechanical reservoir response in general. Three general options to achieve this objective are analogues, computational modelling, and physical modelling in the laboratory.
Dusseault et al. (2011) use analogues to explain many of the fracturing processes that may occur when fluids and/or proppants are injected at high pressure into intact and naturally fractured rock. They consider a medium composed of rigid blocks and injection of a solid. This leads to many insights despite the fact that this is clearly a great simplification of reality.
In Figure 6 a solid material is injected into a material composed of rigid blocks, producing tensile mode I fracturing (i.e., wedging) at the tips of the proppant inclusions, and mode II (i.e., shearing) in the surrounding areas due to block rotations. Wedging creates fracture openings well beyond the proppant tips (or infiltration extents) due to normal extensional forces on the surfaces of the joint leading to tensile (mode I) failure and facilitating slurry/proppant penetration. It also leads to a large increase in the effective permeability in a zone beyond the proppant infiltration.
Analogues can help us understand how fluid and/or proppant injection into a reservoir zone affects the resulting rock deformation. In this case a solid material is injected into a material comprised of rigid blocks, showing clearly where propping, wedging, rotation and shearing will occur. Such observations provide important clues on the anticipated moment tensors throughout the resulting microseismic event cloud. From: Dusseault et al. (2011).
Block rotation continues beyond the area of proppant infiltration and tensile opening at the proppant tips. It involves large changes in both the normal and shear forces excited on the joint surfaces, yielding predominantly mode II fracturing (i.e., shearing). This may cause slip on existing joints in naturally fractured rocks, and even facilitate fault reactivation if the effective stresses are sufficiently to close to criticality. Shear displacement along natural fractures is associated with self-propping where irregular joint surfaces after slip create remnant apertures, facilitating subsequent fluid flow (Dusseault et al., 2011). Such observations provide important clues on the anticipated moment tensors throughout the resulting microseismic event cloud, demonstrating that tensile source mechanism are likely to dominate close to the proppant tips, but double-couple events in all other areas.
Fluid and/or proppant injection into a reservoir zone will create new fractures, as well as close, shear or pop open existing fractures. The various failure mechanisms may lead to a larger microseismic cloud surrounding the area of injected fluids, thereby improving reservoir drainage. The microseismic events are therefore also characterized by a variety of earthquake mechanisms. Their analysis can yield a wealth of knowledge on the underlying failure mechanisms beyond mere locations. From: Dusseault et al. (2011).
Obviously fluid and/or proppant infiltration into naturally fractured rock is significantly more complex since the exact behaviour will depend on the situ stress field, pre-existing in natural fractures and lithologies. The interaction of brittle failure in intact rock and the slip/shearing in naturally fractured areas can be complex (Figure 7); yet the principles deduced from the study of analogues should help unravel the various competing processes.
Analogues provide a first understanding on how fluid and/or proppant injection is likely to deform the surrounding rock mass (Figures 6 and 7). They also provide pertinent clues on where to expect brittle failure (and thus microseismic events) and their most probable failure mechanism (source mechanism). Geomechanical modeling is subsequently a great aid for improving our understanding on links between fluid-induced rock failure, the occurrence of microseismicity and underlying geomechanical behaviour, beyond the assumption of rigid blocks and no fluid diffusion (i.e., no leak off).
Bonded-particle modeling is becoming an important computational tool for modeling the complex dynamical behavior of rocks rupturing given a set of boundary conditions (Potyondy and Cundall, 2004). This approach simulates rock deformation using an assemblage of rigid, round particles that are bonded together. This grid of particles can deform freely and bonds can be broken to represent local failure. Bonds are characterized by normal and shear strengths as well as friction coefficients to model respectively tensile and shear failure. Such a discontinuum-based approach seems more appropriate to model rock deformation through failure since it eliminates the need for complex constitute relations required for continuum approaches (Hazzard and Young, 2000). Also microseismic moment tensors can be inferred by integrating local bond failure in both space and time (Hazzard and Young, 2004).
Chorney et al. (2012) use bonded-particle modelling to examine resulting seismicity for triaxial compression tests using different confining pressures. The resulting Hudson plots (i.e., moment-tensor distribution) show a surprising similarity with those obtained for real data by Baig and Urbancic (2010) from field observations of hydraulic fracturing (Figure 8). Baig and Urbancic (2010) find dominant failure mechanisms of double couple (shearing) and fracture opening and closing (tensile failure and closing). This confirms insights gained from the analogues (Figures 6 and 7) where shearing and tensile failure seem to dominate, respectively, in the surrounding area and at the tips of the proppant infiltrations.
Hudson plots of the failure mechanisms for microseismic events in the bonded-particle simulations for triaxial compression tests with confining pressures of 0 MPa (left) and 40 MPa (right). The colors represent the time: pre-peak stress events are in black; events happening around peak stress are in red and post-peak events are displayed in blue (modified from Chorney et al., 2012). Both fracture opening and closing (tensile failure and closing) occurs. CLVD: Compensated-linear vector dipole. The simulated seismicity shows a surprising correspondence with real field measurements from hydraulic fracturing experiments (e.g., Baig and Urbancic, 2010).
Chorney et al. (2012) also monitor the total input energy of the system, the total kinetic energy emitted from bond breakages, and the energy deduced from the moment magnitudes of the microseismic events. The kinetic energy represents approximately 5% of the input energy; the radiated seismic energy is 50-100 times smaller than the kinetic energy. The radiated energy calculated using the Gutenberg-Richter relationship between moment magnitude and energy may thus underestimate the energy incurred from brittle failure. Both the radiated and kinetic energy from brittle failure are substantially lower than the input energy. This confirms observations by Maxwell et al. (2009) and Boroumand and Eaton (2012). Ductile or slow, aseismic deformation must thus constitute a significant term in the energy budget for both these numerical simulations of triaxial compression and for hydraulic fracturing experiments in general.
Approaches such as bonded-particle models are thus useful to study the anticipated geomechanical behavior of a reservoir; in particular anticipated brittle failure (as expressed by a microseismic event) as well as any aseismic deformation (due to semi-brittle or plastic flow). Ultimately, they may help to investigate how resulting deformation and microseismic emissions depend on (1) in the in situ stress regime, which relates to the magnitude and ratio of the vertical stress Sv and the maximum and minimum horizontal stresses SH and Sh; (2) pre-existing fractures and other zones of weakness most likely to break; and finally (3) the local rock properties defined by the Young’s modulus and Poisson’s ratio (both related to the Lamé parameters). Constraints on many of these factors can be obtained using the processing and interpretation techniques described previously.
Unfortunately, discontinuum-based methods such as bonded-particle approaches may be less suitable to simulate fluid injection as fluids can only be described as small particles. Continuum-based approaches such as finite-element methods may be required for coupled fluid-flow and geomechanical simulation (Dean et al., 2003; Minkoff et al., 2003; Angus et al., 2010). On the other hand, particle-based methods are highly appropriate to modelling crack propagation and brittle failure. Although this is feasible with continuum-based approaches it leads to highly expensive computations. Angus et al. (2010), for instance, circumvent the requirement for modelling fracture propagation by assuming that the differential effective stress tensor at the local point of failure is a first-order approximation to the local failure mechanism (Zoback and Zoback, 1980). For failure in intact rock this is likely a reasonable assumption, but not for failure along pre-existing weaknesses (Gephart and Forsyth, 1984).
Ultimately physical modelling in the laboratory is required to confirm our inferences from the study of analogues and numerical simulations, thereby completing the circle between fluid-induced rock failure, the occurrence of microseismicity and underlying geomechanical deformation. Many authors have studied the links between microseismic event locations and fracture growth in both triaxial compression and hydraulic fracturing tests (Solberg et al., 1980; Sondergeld and Estey, 1981; Kranz et al., 1990; Lockner et al., 1991; Lockner, 1993; Chitrala et al., 2010). Most of these studies were successful in determining the event hypocenters; yet few provided reliable full moment tensor solutions. The latter are essential for better understanding the actual rock failure mechanisms.
The analogues are very useful for building a first understanding on what to expect when injecting fluids and/or proppants into the rock matrix (Figures 6 and 7) but the combination of numerical simulations and their verification using physical experiments in the laboratory will help to bridge the gap between geophysical data analysis and engineering applications of microseismic data by providing a framework for advanced interpretation strategies, thereby facilitating completion of the the circle between acquisition, processing and interpretation.
The recent surge in development of unconventional resources such as shale-gas and heavy-oil plays has created renewed interest in microseismic monitoring. Pore pressure and stress changes during fluid and/or proppant injection lead to an expanding cloud of microseismic events, due to brittle failure in intact rock and additional slip/shearing in naturally fractured rock. The microseismic cloud represents thus a volumetric map of the extent of induced fracture shearing and opening; yet integration of event locations with moment tensors, other geophysical observations and geomechanical constraints is required to determine ultimately the size of the interconnected fracture network, thereby excluding isolated fracturing/shearing, since only the former contributes to the enhanced effective porosity and permeability, required for predicting actual reservoir drainage.
Due to a strong desire for near-real time information by completion engineers, acquisition and service companies have focused predominantly on providing hypocentre locations and moment magnitudes. Microseismic recordings contain, however, a wealth of information beyond event locations, including moment tensors and resonance frequencies. Thus, many pertinent research questions on microseismic acquisition, processing and interpretation remain to be answered before full use of microseismic recordings can be achieved.
Nonetheless, microseismic monitoring has a bright future with long-standing applications such as monitoring of shaft stability in mines and the creation of engineered geothermal systems; more recent applications involve monitoring of hydraulic stimulation of "tight" hydrocarbon reservoirs and steam-injection in heavy-oil fields. Future applications may incorporate surveillance of CO2 storage as well as slurried waste solids disposal through continuous injection.
The first two authors would like to thank the sponsors of the Microseismic Industry Consortium for financial support. Arc Resources, Nanometrics and ESG Solutions are particularly thanked for their support of the field project. All authors would like to thank their collaborators, students and postdocs whose work has contributed tremendously to this paper.
Occupation Safety and Health (OSH) is a multidisciplinary sector dedicated to worker safety and welfare [1, 2]. The goal of this organization is to promote a safe, healthy work environment through a workplace health and safety program. Common law enforces employers to take proper care of employee safety [3, 4]. The legal system can also impose other general functions, set specific tasks, and setup government regulatory bodies. [5] OSH can also protect coworkers, families, workers, employers, and many others who affected by the working environment. As hospitals focus on disease transmission, they are also places for the sick. Everyone with a health problem is more vulnerable to infection, so controlling infection is crucial in patient care [6, 7]. As a medical team member, the infection control policy considers as one of radiography worker’s professional duties. This promotes patient safety, radiographers and other health team members. The emergence of new diseases, their return, and the development of hospital-acquired multi-drug - resistant infections make it even more important to implement such policies and to play a role in preventing spread of infection [8]. Microorganisms are living organisms that are too small to see. Including bacteria, viruses, protozoa, fungi, and prions. Most microorganisms are not infectious or disease-free and essential to our well-being. Normal microbial flora is known through non-infection or disease-free microorganisms within or within the body. They protect and digest the skin, protect it against dangerous organisms that can cause infection or disease. Pathogens are called infection-causing microorganisms. Sometimes the factors that help spread the condition are called the cycle of infection. It is necessary to provide the infectious organ, infectious tank, exit portal, host, front door and move from tank to infectious person [9, 10].
It’s not the infectious organism that transfers it from storage to recipients that interferes most directly with the infection cycle. To do so, the six main transmission routes should be understood. Direct contact is the first itinerary. This means that an infected person must contact the host and directly contact organisms with the sensitive tissue. For example, if an infectious organism contains the mucous membrane of an individual, syphilis, HIV infections may occur directly in the mucous membrane of a susceptible host [11, 12]. Furthermore, the frequent contact with staphylococcal and streptococcal patients is often associated with skin infections of hospital workers. The five other major paths of transmission are indirect and include transport of fluids, vectors, vehicles, airborne media, and droplets. An object of a pathogenic organism is known as a fomite. The catheter contaminated with urine is a typical example. Also included may be the x-ray table, Bucky vertical, image receptors, sponsor positioning with infectious fluids or, perhaps, gloves. Vectors are an arthropod whose organism develops or multiplies an infectious organism before it becomes a new host. Such infected patients can spread diseases to individuals. Examples of vectors include malaria- or dengue-carrying mosquitoes, bubonic fleas, and spotted fever spreading Lyrne or Rocky Mountain disease [13, 14]. Every vehicle with microorganisms is a medium. For example, contaminated food, water, medicines, or blood. The airborne air is contaminated either by five microns of dust or droplet nuclei (a micrometer, μm 0.001 mm) evaporated by an air-microorganism with long suspended air or by a smaller spore. Air currents and a sensitive host inhale these particles. Special air handling and ventilation is needed to avoid airborne transmission of these infected particles. M. Airborne infections include tuberculosis, rubeola, and varicella. Varicella may also contract these viruses by contacting vesicles. Goutlet contamination is usually experienced by host cough, sneezing, talking, or singing [15, 16]. Droplet transmission involves contact with susceptible person’s large eye droplets, nose, and oral microorganisms with mucosal membranes. Unusually long, not air-suspended, 3 feet or less. Examples include influenza, meningitis, diphtheria, pertussis, pulmonary gout spread. Although many organisms may need constant warmth, humidity and concentration of nutrients, bacterial heating, cold and dry endosphorus. Endospores can float in poisonous corners awaiting an invading host. Bacterial spore-forming organisms cause serious but rare diseases like tetanus, anthrax, and botulism. Spores inhaled, eaten or contacted [17, 18]. The host provides moisture, warmth, and nutrients in an endocrine cell. Epidemiological studies show that for weeks, some viruses can resist drying at once. One case is that spores or viral infections cannot overestimate herpes virus cleanliness (orally and genitally).
Radiation exposure measures ionizing air by ionizing photon radiation, i.e. gamma and x-rays. it is defined as the power emitted by radiation within the given volume of air, divided by air mass [19].
The three ways the human body is protected from invasion by microorganisms is to apply natural resilience and defense, resistance (also known as active immunity), and a temporary passive immune system. Mechanical barriers such as intact skin and mucous membranes are natural. Natural power. Natural power. Injuries such as severe burns, abrasion, and cuts can interfere with this skin protective barrier and increase infection risk. Respiratory, urinary, gastrointestinal and reproductive membranes trap foreign particles. The respiratory tract is also bordered by cilia carrying body mucus. Urinary tract is protected against increased urinary composition and external flow infections. Chemicals like lysozyme are also used to destroy invasive microorganisms in human tear, stomach, vagina, and skin acids [20].
Skin pH, salt, and dryness decrease the number of skin bacteria and prevent unwanted flora overgrowth. Nonetheless, microorganisms have access to the body. This results from daily activities like shaving and brushing [21].
This invasion begins with our second line, the inflammatory reaction. The flux of fluids and white blood cells through tissues increases blood flow to the site and allows swallowing and destroying invasive pathogens. That’s called phagocytosis. When viruses infect the body, virus-infected cells create interferons, small protein molecules that protect non-infected cells and others from intrusion. Interferons are species-specific, currently in herpes and chronic hepatitis B and C treatment laboratories.
People are born with some immunity, but most people become disease resistant by becoming infected with a particular organism. This infection may or may not be an obvious disease. Immunity may also be granted from dead or weakened microorganic strains infections or from inactivated toxin. This is known as immunity to some infection. Immunity is acquired because the body differs from the body ‘s foreign proteins. These substances are called antigens. Specific antigen-formed protein substances are antibodies. Antibodies. Antibodies B-cells, a white blood cell, are created to kill invasive alien substances with other white blood cells and avoid re-infection with that antigen. Because the body forms its own antibodies, it has long-term immunity.
Passive immunity follows a specific infection with preformed antibodies. In this case, individuals receive pooled immune globulin (human blood and general population antibodies) before and after exposure to hepatitis A. Antibodies act promptly, but weaken over time to prevent disease. Neonate is temporarily immune to infections due to mother-to-fetus antibodies passing through the uterus. After birth, the infant continues to receive passive immunity. Since the body does not produce these antibodies, passive immunity is short-term [22].
Ergonomics investigates the working environment of the human body. In recent years, ergonomic awareness and training have reduced workplace injustice, but concern remains. The U.S. Labor Statistics Bureau reports hospital workers suffering similar injuries from industrial workers. The most commonly reported injuries are musculoskeletal disorders (MSDs). OSHA classified MSDs are sub-categories of recurrence motion injury (RMIs), repeated strain wound (RSIs), and cumulative trauma (CTDs). RMIs and RSIs, as their names suggest, result from repetitive or extensive pressure application. Stress from repetitive movement, excessive expansion, or long-term maintenance of the same position leads to muscle tissue-developing microtrauma. This microtrauma is the basis of cumulative trauma disorder, leading to chronic malaise and increased musculoskeletal lesions. CTD symptoms are pain, numbness, tingling, shyness, swelling, weakening, loss of function or overdeveloped muscle group (especially in hand and wrist). All health workers are at risk from lifting and moving patients and devices due to back strain. In addition, top neck and shoulders and rotating rashes often tighten the x-ray tube. Computerized technologists are more likely to experience spinal stress and RSI from intensive keyboard work. Intense keyboard work. RSI keyboard affects CTD ‘s hands and grips. Like tendinitis, carpal and ganglion syndrome. Imaging technologies, whose work takes longer to view the cathode ray tube monitor, also have vision problems. While ergonomic awareness is important for all employees, it’s especially important for sonographers. RMIs and RSIs often affect Radiographer shoulder, arm, or wrist 80% of sonographers suffer work injuries. Sonographers number 80 percent. The root causes of these problems include equipment design, low posture, constant transducer pressure, difficult movements, unsatisfactory breaks, and overall stress. In recent years, high-end sonographic injuries have increased due to changes in equipment design and work characteristics [23].
Older transducers were heavier, but the patient had a stable arm that supported the transducer ‘s weight. New transductors are smaller and lighter, but their pressure and motor skills are needed. Furthermore, digital systems eliminated the need to change cassettes and process films to reduce activity. Imaging takes longer and specialization increases resemblance and recurrence. There are more tests; with techniques evolving, many tests are longer, harder and more repetitive. OSHA works with hospitals and equipment manufacturers to improve sonographic ergonomics, and education programs emphasize sonographers’ role in postures, change positions, and breaks. Work injuries are minimized when enough equipment is available and properly used, and workers support each other. Frequent breaks and changes in position help minimize stress and position. Studies show that the right approach is continuing training programs and employer responses to employee ergonomic interests [6, 24].
About 2 million patients are infected with nosocomial every year. Although many of these infections pose life-threats, CDC estimates that 90,000 people die from hospital-acquired infections every year and most of them are preventable. Medical conditions are ideal for developing and transmitting nosocomial infections. Typical sources of nosocomial infection include contaminated hands, instruments, and urinary catheters that facilitate microbes entering the body. Invasive methods allow pathogens to enter bloodstream and overcome patients’ defensive mechanisms. The extensive and inappropriate use of wide-spectrum antibiotics has resulted in either hospital or community drug-resistant infections. Some of these infections can not be treated because they resist existing medicines. Developing a new medicinal product takes time, is expensive, and does not seem a lasting solution to this complex issue. Several nosocomial infections involve medical and multidrug-resistant patients. This means more than one antibiotic resistant. Staphylococcus aureus (MRSA) methicillin and enterococci resistant to vancomycin cause injury surgery, urinary tract and blood fluid infections. MRSA may also cause respiratory infections. Penicillin-resistant aeruginosa causes streptococcal and pseudomonas respiratory infection. The development and spread of these multi-drug-resistant infections was associated with antimicrobial overuse and poor infection management practices. Intensive infection control is required to reduce spread. These pathogens are hard to treat. Over the last 20 years, MRSA was recognized as a health problem. MRSA has been a community issue in recent years and is known as a community-related issue, or CA-MRSA. The CDC has created a relationship between new antibiotic use and sharing of personal contaminated objects, people in crowded environments, and poor hygiene. MRSA is associated with skin and soft tissue infections that can be treated with alternative antibiotics. These groups affected drug users, men who have sex with men, prisoners, military personnel, children in nursing facilities and athletes. Even when we write, other organisms adapt [2, 3, 17].
If there is a sudden needle stick or a contaminated object breaks the skin, let the wound bleed under cold soap water. When the patient’s body fluids sprinkle x-ray eyes, nose, or mouth, rinse your mucosal membranes with water. Even if the injury might seem trifling. In addition to the incident report, most hospitals now look for a baseline blood sample to prevent occupational infections. In addition, the health care provider will need to advise the X-ray technician on post-exposure prophylaxis (PEP) therapy after contaminated needle puncture. If treatment is recommended, it should take 2 hours for blood to become exposed. A four-week dos-drug regime is currently recommended for most PEP-defined HIV and several drug options. Hepatitis B and C are also tested using the x-ray HIV test. If radiologists have not used a vaccine for hepatitis B, the immune globulin and hepatitis B vaccines initiate immunity immediately. There is currently no effective hepatitis C therapy, therefore a follow-up HCV test is required to determine if the radiograph is exposed to a positive source. Because the blood cannot see HIV infection for about three months, it takes six months to get another HIV test [11, 17, 20].
Objects or linens soiled with body secretions or excretions can be considered contaminated, but not visible, and can be used as fomites. The linen of every patient should be treated as lowly as possible. Place the edges of the linen in the center without throwing or flapping, and place balled linen immediately in the barrier to prevent contamination from the air. Most institutions today treat linen equally irrespective of the contamination. Place the linen in plastic bags, and use washing agents to prevent infection. Many hospitals offer hot water bags for cleaning, and laundry personnel process the linen several times [7, 9].
A modern hospital uses numerous devices to deliver contaminated waste, from simple objects such as cups and fabrics to complex objects such as catheterization. Contaminated disposal of waste only disposable items is used once, and then discarded. The only exception is that the same patient reuses the same non-sterile product immediately (e.g., the emesis basin). Each hospital has protocol for the disposal of devices. Some are split into containers covered with glass, plastic or paper, and others are combined. Follow procedure with x-rays. For disposal of objects contaminated with blood or liquid body, the Regulations require a biohazard symbol in the relevant container and marking. The needles and syringes used are placed in special, non-syringe recovery containers. New requirements for safer OSHA medical devices could reduce the high number of needle sticks that more unprotected, sharp workers had previously produced. There are lots of safe medical equipment. Some have a sheath to protect the contaminated needle, others have a needle which is retracting. When the needle is removed from the vein, the medical practitioner may take the needle back into the syringe. Use those safety features to avoid accidental needle sticks. When initial venous access is established, the needle-free system offers maximum needle stick protection and should be used in drugs and contrast media. Contaminated bandages and dressings are treated with gloves, they are directly sealed and disposed of in red plastic biohazard bags. Before being sent to the laboratory, place the specimens in safe containers and in a plastic bag marked with a biohazard symbol [21, 22].
Before UP, diagnosis or suspected transmissible disease was the reason patients were isolated. All patients indicated that UP and BSP were potentially infectious. These new precautions were used in hospitals, in conjunction with their isolation policies. Hence, this text identifies several types of isolation systems previously used and describes the CDC recommendations as they stand. Initially, the hospital guidelines recommended one of two hospital systems: a category-specific system with seven different types of isolation, or a system specific to the disease. These two systems replace the current Guidelines. In addition to a synopsis of precautionary types and patients requiring precautions, Annex G is a CDC document reproducing reconciliations in order to prevent hospital isolations [3, 9, 12].
The CDC has recommended that patients be isolated by transmission precautions as part of the standard precautions. This system replaces precautions for older categorized diseases that are based on transmission. These sets aim to minimize airborne transmission, droplets and risk of contact. They can be used individually or with standard precautions, on a number of disease pathways [4, 9].
Airborne precautions aim to reduce the risk of transferring infectious or gout nuclei particles (5 ppm or less) to a susceptible person. They take airborne precautions to prevent tuberculosis and rubeola. Medical professionals and visitors in a room of an infectious person must wear NIOSH-approved particulate breathers. These masks must filter 1 micron with an efficiency of 95 percent. Patients undergo airborne treatment in rooms with negative airflows and special air circulation, with more than six external air interchanges per hour or via HEPA filters. These rooms are forever closed [3, 7].
Droplet precautions have been designed to reduce sensitive nose or mouth contact with particles of large droplet connectivity (over 5 microns). Precautions are applied to prevent transmission of diseases such as diphtheria, pneumonia, and influenza. Medical staff and visitors in contact with these patients must wear surgical masks but they do not require special circulation of air in these rooms. Contact precautions are designed to minimize the risk of pathogen transmission through direct skin-to-skin contact, or indirect contact with a contaminated object. Contact precautions are used to prevent MRSA- and new VRE-resistant infections. (H7:0157) Coli. It must be worn by doctors in close contact with infected patients who cause gastrointestinal and renal problems and various sunlike infections such as glove, and clothing. Contact precautions when merging airborne. Airborne and contact precautions are combined to minimize the risk of airborne droplet nodes transmitting pathogens and direct contact with the skin. These precautions are used to prevent the spread of the chicken pox and herpes zoster by SARS and varicella viruses. Health care workers without a pox should avoid contact with patients who are infected. Infected personnel do not need to have any masks beforehand [7, 9, 23].
Using friendly patient interest in protective radiation functions and avoiding fear or repulsion, radiographers can help alleviate those sensations. Isolation Two patients require x-rays, two rays preferred. Patient belongs to the ‘dirty’ team, and the device is managed by the ‘clean’ Member. Although both radiographers must take all the prescribed isolation precautions, the ‘clean’ member does not have direct contact with the patient, bed or any item that the patient may have touched. Only the X-ray machine and uncovered image receptors (IR) use this radiogram. This team method minimizes contamination with the x-rays, which is difficult to disinfect completely. Radiographer and his colleagues shall prepare the required IRs before entering the insulation room by putting each in a smoothly fitting plastic bag and the lead table of Don Radiographer. The jewelry should be removed from the x-ray, view it in the pocket or pin it in the uniform of the x-ray [9, 12, 25].
\nAt the door, radiographer shall take the necessary precautions (e.g., gloves, dresses, and masks). Apply the recommended guidelines for isolation and donate protective clothing for the specified type of isolation. It can be carried out in a hallway adjacent to the area in which the room is isolated. Now the radiographers are ready to go to bed. Welcome to the procedure, explain, and introduce yourself. The dirty team member places the IR properly, so that the exposure side is toward the radiation tube. Team cleaner locates the machine and displays controls. After each exposure has finished, the IR is recovered with partial deletion of the protective cover. It then offers an edge-clean teammate. The contaminated cover is placed in the appropriate container which keeps the IR in the cabinet of the engine. The radiology technologist must make sure the patient is safe and comfortable, before removing the x-ray dress at the end of the test. Radiology technologist must firstly remove the gloves [13, 15, 26].
The immunity of the patient is very limited, and it takes special precautions to prevent inflammation. Organ transplants may be received, along with immunosuppressive medicines. The burning of patients and neonates may also require these precautions. Patients undergoing chemotherapy sometimes use these precautions to reduce resistance. Once this is called reverse isolation, or isolation from protection. The 1983 Federal Isolation Directive removed the protection class, mainly because it differs in purpose and procedure from other categories I of isolation. The basics are identical! Those terms may still be used in the clinical environment by the radiograph. Precautions for an affected patient require that the equipment be cleaned before they enter the room. Hand hygiene is required before the patient touches the bed or the patient’s items. Masks, caps, sterile robes and handkerchiefs can be worn as an operation or modified. Modified technique leads to very high sterile-protocol aseptic medical therapy. Specific precautions are taken outside of the room for patients. Team member is the “clean” X-ray that puts the patient under guard. This X-ray user avoids contact with uncovered IRs, X-rays and other potentially contaminated objects using the right protective clothing. This X-ray folds the edges, keeping it open if the second X-ray is to properly cover the IR inside the sterile cassettlement. It’s important that there is no contamination outside the cover. The patient, bed, clean object and IR only affect the clean x-ray and only the filtered x-ray affects the device. That is precisely the opposite of isolation.
In this chapter, we defined aseptic medical systems as a means of reducing and interfering with the process of spreading pathogenic microorganisms across the environment. Operational asepsis however constitutes destruction of equipment or spores and organisms for patient care. In the first case, sterile linen, gloves, and surgical devices are examples, but many other operations require sterile treatment, such as lumbar perforations, catheterization, and injections, as well as some patients who are immunocompromised. Too few naked microorganisms are visible, like bacteria, protozoa, prions, and fungi [2, 3]. Some microorganisms protect and benefit individuals and are called normal flora: some are hazardous, cause disease and infection, and are known to be pathogenic. The infectious organism, infection tank, exit and entry portals, transmission mode and sensitive home are all part of the infectious cycle. Include body protection in three ways: resistance, defense, immunity, short-term immunity, and microorganism infestations. Body protection includes factors propagating disease. New diseases, existing effects or geographical conditions, and repeated old diseases caused by old diseases or mutated diseases are the emerging conditions. Emerging diseases are a major issue. Many factors can lead to emerging diseases, including increased exposure to vectors, population growth, migration to crowded cities, global travel, antimicrobial overuse, public safety crashes, and biological terror [7, 8]. The total number of cases in the U.S. and worldwide continues to increase. HIV/AIDS is a major public health issue. MSM and IDUs are the most common cases. Transmission routes include sex, infected blood, body and needle fluids, placenta, fetal mother, and breast-milk babies. As a blood borne pathogen, transmission risk to health workers is very low. The main concerns are health workers, both bloodborne and diagnosed with hepatitis B and C. 0 Vaccines and preventive therapies, but C is not available. Medical workers are less likely to contract C, but you get more chronic liver infection and cirrhosis. Contamination of feces and water transmits A and E. Hepatitis A is the disease’s most common vaccine. If needles are infected with the patient’s eye needle, nose, or mouth splashes with the patient’s fluid, post-exposure healthcare practitioners should use procedures. Tuberculosis is primarily M-induced pulmonary disease. Air pollution and tuberculosis. Foreign-born residents are America is most common. Tuberculin skin testing is the easiest way to test TB infection. Real TB hospitals must undergo procedures such as tuberculin skin testing, personal breathing facilities, one or more negative air pressure and special ventilation isolation rooms. Aseptic therapy aims to reduce transmission risk to sensitive people of infectious organisms. Frequent hand hygiene is the best aseptic practice [1, 2, 23]. Hand hygiene includes soap and water washing your hands, taking spumes or gels if no visible soil is present. Good household management reduces airborne infections and pathogens. Examples of possible forms of medical aseptic include dust, disinfection, and good liner management, dry and wet waste disposal, and sharp container use. Current isolation and infection management policies have evolved in home quarantining families. Initially, infection was only diagnosed in isolated patients, but HIV and AIDS changed. Besides infectious diseases, new treatment processes were introduced for all patients in hospitals. The current system has two areas: (1) Defense and hygiene barriers are standard precautions for all patients based on patient contact. (2) Transmission-based precautions apply to patients with infectious diseases [13, 26].
Health workers must wear protective clothing, regardless of patient contact. Airborne, droplet and contact transmission risk can be reduced independently or in combination by using three categories of precautions. The isolating patient’s x-rays involve two individuals: (1) the x-rays are placed as “clean x-rays” (2) the receptive image is “dirty” and the patient as infectious. If they remember their roles, cross-contamination is minimized. Both X-rays give the inspection and testing room clothing. X-rays are carefully removed, imaging, recording equipment disinfected, and hand hygiene after testing is done. Radiology Department may refer isolated patients for imaging studies [23, 24]. To wear protective clothing and work as a team to complete the exam, at least two radiation are needed. The first is patient placement, and the second is equipment placement and control. After transportation, the stretcher or wheelchair is covered in paper. The linen, wet and dry waste should be properly disinfected in the X-ray room. Immunosuppression requires safeguards for endangered patients, including weakened immune systems, drugs, brandy, and neonates [17, 19]. The patient is in control as “clean ray” and “dirty.” Easy hands smooth clothing, gloves and sterile clothing are safeguards. All organisms, spores, and procedures, including aseptic surgical disease, must be destroyed. Operational aseptics are often surgery-related but also used when an invasive procedure such as lobster punctures or urinary catheterization is performed. Aseptic surgical therapy also treats patients with immune problems. Operations involve sterile fields, operational sprinkling, and invasive clothing. Four different sterilization techniques and equipment can be used for chemical, dry, ethylene-oxide gas, plasma gas and autoclave. Each method recommends advantages, disadvantages, and uses. Sterility and biological indicators are reused to ensure that all packages are properly sterilized, damaging all forms of microbial life during sterilization. Micro-organisms can use sterile fields without sterile equipment. Sterility and supply of the packet must be adequately confirmed and opened before establishing a sterile field to prevent contamination. If a sterile field is established, additional sterile objects and liquids may follow suitable procedures [12, 24].
I would like to express my gratitude toward Dr. Yousif Abdallah (
You have been successfully unsubscribed.
",metaTitle:"Unsubscribe Successful",metaDescription:"You have been successfully unsubscribed.",metaKeywords:null,canonicalURL:"/page/unsubscribe-successful",contentRaw:'[{"type":"htmlEditorComponent","content":""}]'},components:[{type:"htmlEditorComponent",content:""}]},successStories:{items:[]},authorsAndEditors:{filterParams:{sort:"featured,name"},profiles:[{id:"6700",title:"Dr.",name:"Abbass A.",middleName:null,surname:"Hashim",slug:"abbass-a.-hashim",fullName:"Abbass A. Hashim",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/6700/images/1864_n.jpg",biography:"Currently I am carrying out research in several areas of interest, mainly covering work on chemical and bio-sensors, semiconductor thin film device fabrication and characterisation.\nAt the moment I have very strong interest in radiation environmental pollution and bacteriology treatment. The teams of researchers are working very hard to bring novel results in this field. I am also a member of the team in charge for the supervision of Ph.D. students in the fields of development of silicon based planar waveguide sensor devices, study of inelastic electron tunnelling in planar tunnelling nanostructures for sensing applications and development of organotellurium(IV) compounds for semiconductor applications. I am a specialist in data analysis techniques and nanosurface structure. I have served as the editor for many books, been a member of the editorial board in science journals, have published many papers and hold many patents.",institutionString:null,institution:{name:"Sheffield Hallam University",country:{name:"United Kingdom"}}},{id:"54525",title:"Prof.",name:"Abdul Latif",middleName:null,surname:"Ahmad",slug:"abdul-latif-ahmad",fullName:"Abdul Latif Ahmad",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:null},{id:"20567",title:"Prof.",name:"Ado",middleName:null,surname:"Jorio",slug:"ado-jorio",fullName:"Ado Jorio",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Universidade Federal de Minas Gerais",country:{name:"Brazil"}}},{id:"47940",title:"Dr.",name:"Alberto",middleName:null,surname:"Mantovani",slug:"alberto-mantovani",fullName:"Alberto Mantovani",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:null},{id:"12392",title:"Mr.",name:"Alex",middleName:null,surname:"Lazinica",slug:"alex-lazinica",fullName:"Alex Lazinica",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/12392/images/7282_n.png",biography:"Alex Lazinica is the founder and CEO of IntechOpen. After obtaining a Master's degree in Mechanical Engineering, he continued his PhD studies in Robotics at the Vienna University of Technology. Here he worked as a robotic researcher with the university's Intelligent Manufacturing Systems Group as well as a guest researcher at various European universities, including the Swiss Federal Institute of Technology Lausanne (EPFL). During this time he published more than 20 scientific papers, gave presentations, served as a reviewer for major robotic journals and conferences and most importantly he co-founded and built the International Journal of Advanced Robotic Systems- world's first Open Access journal in the field of robotics. Starting this journal was a pivotal point in his career, since it was a pathway to founding IntechOpen - Open Access publisher focused on addressing academic researchers needs. Alex is a personification of IntechOpen key values being trusted, open and entrepreneurial. Today his focus is on defining the growth and development strategy for the company.",institutionString:null,institution:{name:"TU Wien",country:{name:"Austria"}}},{id:"19816",title:"Prof.",name:"Alexander",middleName:null,surname:"Kokorin",slug:"alexander-kokorin",fullName:"Alexander Kokorin",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/19816/images/1607_n.jpg",biography:"Alexander I. Kokorin: born: 1947, Moscow; DSc., PhD; Principal Research Fellow (Research Professor) of Department of Kinetics and Catalysis, N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow.\r\nArea of research interests: physical chemistry of complex-organized molecular and nanosized systems, including polymer-metal complexes; the surface of doped oxide semiconductors. He is an expert in structural, absorptive, catalytic and photocatalytic properties, in structural organization and dynamic features of ionic liquids, in magnetic interactions between paramagnetic centers. The author or co-author of 3 books, over 200 articles and reviews in scientific journals and books. He is an actual member of the International EPR/ESR Society, European Society on Quantum Solar Energy Conversion, Moscow House of Scientists, of the Board of Moscow Physical Society.",institutionString:null,institution:{name:"Semenov Institute of Chemical Physics",country:{name:"Russia"}}},{id:"62389",title:"PhD.",name:"Ali Demir",middleName:null,surname:"Sezer",slug:"ali-demir-sezer",fullName:"Ali Demir Sezer",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/62389/images/3413_n.jpg",biography:"Dr. Ali Demir Sezer has a Ph.D. from Pharmaceutical Biotechnology at the Faculty of Pharmacy, University of Marmara (Turkey). He is the member of many Pharmaceutical Associations and acts as a reviewer of scientific journals and European projects under different research areas such as: drug delivery systems, nanotechnology and pharmaceutical biotechnology. Dr. Sezer is the author of many scientific publications in peer-reviewed journals and poster communications. Focus of his research activity is drug delivery, physico-chemical characterization and biological evaluation of biopolymers micro and nanoparticles as modified drug delivery system, and colloidal drug carriers (liposomes, nanoparticles etc.).",institutionString:null,institution:{name:"Marmara University",country:{name:"Turkey"}}},{id:"61051",title:"Prof.",name:"Andrea",middleName:null,surname:"Natale",slug:"andrea-natale",fullName:"Andrea Natale",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:null},{id:"100762",title:"Prof.",name:"Andrea",middleName:null,surname:"Natale",slug:"andrea-natale",fullName:"Andrea Natale",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"St David's Medical Center",country:{name:"United States of America"}}},{id:"107416",title:"Dr.",name:"Andrea",middleName:null,surname:"Natale",slug:"andrea-natale",fullName:"Andrea Natale",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Texas Cardiac Arrhythmia",country:{name:"United States of America"}}},{id:"64434",title:"Dr.",name:"Angkoon",middleName:null,surname:"Phinyomark",slug:"angkoon-phinyomark",fullName:"Angkoon Phinyomark",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/64434/images/2619_n.jpg",biography:"My name is Angkoon Phinyomark. I received a B.Eng. degree in Computer Engineering with First Class Honors in 2008 from Prince of Songkla University, Songkhla, Thailand, where I received a Ph.D. degree in Electrical Engineering. My research interests are primarily in the area of biomedical signal processing and classification notably EMG (electromyography signal), EOG (electrooculography signal), and EEG (electroencephalography signal), image analysis notably breast cancer analysis and optical coherence tomography, and rehabilitation engineering. I became a student member of IEEE in 2008. During October 2011-March 2012, I had worked at School of Computer Science and Electronic Engineering, University of Essex, Colchester, Essex, United Kingdom. In addition, during a B.Eng. I had been a visiting research student at Faculty of Computer Science, University of Murcia, Murcia, Spain for three months.\n\nI have published over 40 papers during 5 years in refereed journals, books, and conference proceedings in the areas of electro-physiological signals processing and classification, notably EMG and EOG signals, fractal analysis, wavelet analysis, texture analysis, feature extraction and machine learning algorithms, and assistive and rehabilitative devices. I have several computer programming language certificates, i.e. Sun Certified Programmer for the Java 2 Platform 1.4 (SCJP), Microsoft Certified Professional Developer, Web Developer (MCPD), Microsoft Certified Technology Specialist, .NET Framework 2.0 Web (MCTS). I am a Reviewer for several refereed journals and international conferences, such as IEEE Transactions on Biomedical Engineering, IEEE Transactions on Industrial Electronics, Optic Letters, Measurement Science Review, and also a member of the International Advisory Committee for 2012 IEEE Business Engineering and Industrial Applications and 2012 IEEE Symposium on Business, Engineering and Industrial Applications.",institutionString:null,institution:{name:"Joseph Fourier University",country:{name:"France"}}},{id:"55578",title:"Dr.",name:"Antonio",middleName:null,surname:"Jurado-Navas",slug:"antonio-jurado-navas",fullName:"Antonio Jurado-Navas",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/55578/images/4574_n.png",biography:"Antonio Jurado-Navas received the M.S. degree (2002) and the Ph.D. degree (2009) in Telecommunication Engineering, both from the University of Málaga (Spain). He first worked as a consultant at Vodafone-Spain. From 2004 to 2011, he was a Research Assistant with the Communications Engineering Department at the University of Málaga. In 2011, he became an Assistant Professor in the same department. From 2012 to 2015, he was with Ericsson Spain, where he was working on geo-location\ntools for third generation mobile networks. Since 2015, he is a Marie-Curie fellow at the Denmark Technical University. His current research interests include the areas of mobile communication systems and channel modeling in addition to atmospheric optical communications, adaptive optics and statistics",institutionString:null,institution:{name:"University of Malaga",country:{name:"Spain"}}}],filtersByRegion:[{group:"region",caption:"North America",value:1,count:5717},{group:"region",caption:"Middle and South America",value:2,count:5179},{group:"region",caption:"Africa",value:3,count:1696},{group:"region",caption:"Asia",value:4,count:10260},{group:"region",caption:"Australia and Oceania",value:5,count:890},{group:"region",caption:"Europe",value:6,count:15670}],offset:12,limit:12,total:117458},chapterEmbeded:{data:{}},editorApplication:{success:null,errors:{}},ofsBooks:{filterParams:{sort:"dateendthirdsteppublish"},books:[],filtersByTopic:[{group:"topic",caption:"Agricultural and Biological Sciences",value:5,count:11},{group:"topic",caption:"Biochemistry, Genetics and Molecular Biology",value:6,count:14},{group:"topic",caption:"Business, Management and Economics",value:7,count:2},{group:"topic",caption:"Chemistry",value:8,count:7},{group:"topic",caption:"Computer and Information Science",value:9,count:10},{group:"topic",caption:"Earth and Planetary Sciences",value:10,count:4},{group:"topic",caption:"Engineering",value:11,count:16},{group:"topic",caption:"Environmental Sciences",value:12,count:2},{group:"topic",caption:"Immunology and Microbiology",value:13,count:4},{group:"topic",caption:"Materials Science",value:14,count:5},{group:"topic",caption:"Mathematics",value:15,count:1},{group:"topic",caption:"Medicine",value:16,count:51},{group:"topic",caption:"Neuroscience",value:18,count:1},{group:"topic",caption:"Pharmacology, Toxicology and Pharmaceutical Science",value:19,count:5},{group:"topic",caption:"Physics",value:20,count:3},{group:"topic",caption:"Psychology",value:21,count:3},{group:"topic",caption:"Robotics",value:22,count:1},{group:"topic",caption:"Social Sciences",value:23,count:3},{group:"topic",caption:"Technology",value:24,count:1},{group:"topic",caption:"Veterinary Medicine and Science",value:25,count:2}],offset:0,limit:12,total:null},popularBooks:{featuredBooks:[],offset:0,limit:12,total:null},hotBookTopics:{hotBooks:[],offset:0,limit:12,total:null},publish:{},publishingProposal:{success:null,errors:{}},books:{featuredBooks:[{type:"book",id:"7802",title:"Modern Slavery and Human Trafficking",subtitle:null,isOpenForSubmission:!1,hash:"587a0b7fb765f31cc98de33c6c07c2e0",slug:"modern-slavery-and-human-trafficking",bookSignature:"Jane Reeves",coverURL:"https://cdn.intechopen.com/books/images_new/7802.jpg",editors:[{id:"211328",title:"Prof.",name:"Jane",middleName:null,surname:"Reeves",slug:"jane-reeves",fullName:"Jane Reeves"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}},{type:"book",id:"9961",title:"Data Mining",subtitle:"Methods, Applications and Systems",isOpenForSubmission:!1,hash:"ed79fb6364f2caf464079f94a0387146",slug:"data-mining-methods-applications-and-systems",bookSignature:"Derya Birant",coverURL:"https://cdn.intechopen.com/books/images_new/9961.jpg",editors:[{id:"15609",title:"Dr.",name:"Derya",middleName:null,surname:"Birant",slug:"derya-birant",fullName:"Derya Birant"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}},{type:"book",id:"8545",title:"Animal Reproduction in Veterinary Medicine",subtitle:null,isOpenForSubmission:!1,hash:"13aaddf5fdbbc78387e77a7da2388bf6",slug:"animal-reproduction-in-veterinary-medicine",bookSignature:"Faruk Aral, Rita Payan-Carreira and Miguel Quaresma",coverURL:"https://cdn.intechopen.com/books/images_new/8545.jpg",editors:[{id:"25600",title:"Prof.",name:"Faruk",middleName:null,surname:"Aral",slug:"faruk-aral",fullName:"Faruk Aral"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}},{type:"book",id:"9157",title:"Neurodegenerative Diseases",subtitle:"Molecular Mechanisms and Current Therapeutic Approaches",isOpenForSubmission:!1,hash:"bc8be577966ef88735677d7e1e92ed28",slug:"neurodegenerative-diseases-molecular-mechanisms-and-current-therapeutic-approaches",bookSignature:"Nagehan Ersoy Tunalı",coverURL:"https://cdn.intechopen.com/books/images_new/9157.jpg",editors:[{id:"82778",title:"Ph.D.",name:"Nagehan",middleName:null,surname:"Ersoy Tunalı",slug:"nagehan-ersoy-tunali",fullName:"Nagehan Ersoy Tunalı"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}},{type:"book",id:"8686",title:"Direct Torque Control Strategies of Electrical Machines",subtitle:null,isOpenForSubmission:!1,hash:"b6ad22b14db2b8450228545d3d4f6b1a",slug:"direct-torque-control-strategies-of-electrical-machines",bookSignature:"Fatma Ben Salem",coverURL:"https://cdn.intechopen.com/books/images_new/8686.jpg",editors:[{id:"295623",title:"Associate Prof.",name:"Fatma",middleName:null,surname:"Ben Salem",slug:"fatma-ben-salem",fullName:"Fatma Ben Salem"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}},{type:"book",id:"7434",title:"Molecular Biotechnology",subtitle:null,isOpenForSubmission:!1,hash:"eceede809920e1ec7ecadd4691ede2ec",slug:"molecular-biotechnology",bookSignature:"Sergey Sedykh",coverURL:"https://cdn.intechopen.com/books/images_new/7434.jpg",editors:[{id:"178316",title:"Ph.D.",name:"Sergey",middleName:null,surname:"Sedykh",slug:"sergey-sedykh",fullName:"Sergey Sedykh"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}},{type:"book",id:"9208",title:"Welding",subtitle:"Modern Topics",isOpenForSubmission:!1,hash:"7d6be076ccf3a3f8bd2ca52d86d4506b",slug:"welding-modern-topics",bookSignature:"Sadek Crisóstomo Absi Alfaro, Wojciech Borek and Błażej Tomiczek",coverURL:"https://cdn.intechopen.com/books/images_new/9208.jpg",editors:[{id:"65292",title:"Prof.",name:"Sadek Crisostomo Absi",middleName:"C. Absi",surname:"Alfaro",slug:"sadek-crisostomo-absi-alfaro",fullName:"Sadek Crisostomo Absi Alfaro"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}},{type:"book",id:"7831",title:"Sustainability in Urban Planning and Design",subtitle:null,isOpenForSubmission:!1,hash:"c924420492c8c2c9751e178d025f4066",slug:"sustainability-in-urban-planning-and-design",bookSignature:"Amjad Almusaed, Asaad Almssad and Linh Truong - Hong",coverURL:"https://cdn.intechopen.com/books/images_new/7831.jpg",editors:[{id:"110471",title:"Dr.",name:"Amjad",middleName:"Zaki",surname:"Almusaed",slug:"amjad-almusaed",fullName:"Amjad Almusaed"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}},{type:"book",id:"9343",title:"Trace Metals in the Environment",subtitle:"New Approaches and Recent Advances",isOpenForSubmission:!1,hash:"ae07e345bc2ce1ebbda9f70c5cd12141",slug:"trace-metals-in-the-environment-new-approaches-and-recent-advances",bookSignature:"Mario Alfonso Murillo-Tovar, Hugo Saldarriaga-Noreña and Agnieszka Saeid",coverURL:"https://cdn.intechopen.com/books/images_new/9343.jpg",editors:[{id:"255959",title:"Dr.",name:"Mario Alfonso",middleName:null,surname:"Murillo-Tovar",slug:"mario-alfonso-murillo-tovar",fullName:"Mario Alfonso Murillo-Tovar"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}},{type:"book",id:"9139",title:"Topics in Primary Care Medicine",subtitle:null,isOpenForSubmission:!1,hash:"ea774a4d4c1179da92a782e0ae9cde92",slug:"topics-in-primary-care-medicine",bookSignature:"Thomas F. Heston",coverURL:"https://cdn.intechopen.com/books/images_new/9139.jpg",editors:[{id:"217926",title:"Dr.",name:"Thomas F.",middleName:null,surname:"Heston",slug:"thomas-f.-heston",fullName:"Thomas F. Heston"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}}],latestBooks:[{type:"book",id:"6934",title:"Psycho-Social Aspects of Human Sexuality and Ethics",subtitle:null,isOpenForSubmission:!1,hash:"44731b106aa0d1ab5c64a7394483c7d5",slug:"psycho-social-aspects-of-human-sexuality-and-ethics",bookSignature:"Dhastagir Sultan Sheriff",coverURL:"https://cdn.intechopen.com/books/images_new/6934.jpg",editedByType:"Edited by",editors:[{id:"167875",title:"Dr.",name:"Dhastagir Sultan",middleName:null,surname:"Sheriff",slug:"dhastagir-sultan-sheriff",fullName:"Dhastagir Sultan Sheriff"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"10062",title:"Forecasting in Mathematics",subtitle:"Recent Advances, New Perspectives and Applications",isOpenForSubmission:!1,hash:"9a3ad05fef0502040d2a238ad22487c0",slug:"forecasting-in-mathematics-recent-advances-new-perspectives-and-applications",bookSignature:"Abdo Abou Jaoude",coverURL:"https://cdn.intechopen.com/books/images_new/10062.jpg",editedByType:"Edited by",editors:[{id:"248271",title:"Dr.",name:"Abdo",middleName:null,surname:"Abou Jaoude",slug:"abdo-abou-jaoude",fullName:"Abdo Abou Jaoude"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"9043",title:"Parenting",subtitle:"Studies by an Ecocultural and Transactional Perspective",isOpenForSubmission:!1,hash:"6d21066c7438e459e4c6fb13217a5c8c",slug:"parenting-studies-by-an-ecocultural-and-transactional-perspective",bookSignature:"Loredana Benedetto and Massimo Ingrassia",coverURL:"https://cdn.intechopen.com/books/images_new/9043.jpg",editedByType:"Edited by",editors:[{id:"193200",title:"Prof.",name:"Loredana",middleName:null,surname:"Benedetto",slug:"loredana-benedetto",fullName:"Loredana Benedetto"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"10075",title:"Nonlinear Optics",subtitle:"From Solitons to Similaritons",isOpenForSubmission:!1,hash:"b034b2a060292c8511359aec0db1002c",slug:"nonlinear-optics-from-solitons-to-similaritons",bookSignature:"İlkay Bakırtaş and Nalan Antar",coverURL:"https://cdn.intechopen.com/books/images_new/10075.jpg",editedByType:"Edited by",editors:[{id:"186388",title:"Prof.",name:"İlkay",middleName:null,surname:"Bakırtaş",slug:"ilkay-bakirtas",fullName:"İlkay Bakırtaş"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"10116",title:"Nano- and Microencapsulation",subtitle:"Techniques and Applications",isOpenForSubmission:!1,hash:"8d92c5999718734b36a0cc3a6af7c7f6",slug:"nano-and-microencapsulation-techniques-and-applications",bookSignature:"Nedal Abu-Thabit",coverURL:"https://cdn.intechopen.com/books/images_new/10116.jpg",editedByType:"Edited by",editors:[{id:"308436",title:"Associate Prof.",name:"Nedal",middleName:null,surname:"Abu-Thabit",slug:"nedal-abu-thabit",fullName:"Nedal Abu-Thabit"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"9881",title:"Perovskite and Piezoelectric Materials",subtitle:null,isOpenForSubmission:!1,hash:"8fa0e0f48567bbc50fbb3bfdde6f9a0b",slug:"perovskite-and-piezoelectric-materials",bookSignature:"Someshwar Pola, Neeraj Panwar and Indrani Coondoo",coverURL:"https://cdn.intechopen.com/books/images_new/9881.jpg",editedByType:"Edited by",editors:[{id:"177037",title:"Dr.",name:"Someshwar",middleName:null,surname:"Pola",slug:"someshwar-pola",fullName:"Someshwar Pola"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"9394",title:"Genotoxicity and Mutagenicity",subtitle:"Mechanisms and Test Methods",isOpenForSubmission:!1,hash:"9ee7e597358dbbfb5e33d0beb76e6fff",slug:"genotoxicity-and-mutagenicity-mechanisms-and-test-methods",bookSignature:"Sonia Soloneski and Marcelo L. Larramendy",coverURL:"https://cdn.intechopen.com/books/images_new/9394.jpg",editedByType:"Edited by",editors:[{id:"14863",title:"Dr.",name:"Sonia",middleName:null,surname:"Soloneski",slug:"sonia-soloneski",fullName:"Sonia Soloneski"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"7434",title:"Molecular Biotechnology",subtitle:null,isOpenForSubmission:!1,hash:"eceede809920e1ec7ecadd4691ede2ec",slug:"molecular-biotechnology",bookSignature:"Sergey Sedykh",coverURL:"https://cdn.intechopen.com/books/images_new/7434.jpg",editedByType:"Edited by",editors:[{id:"178316",title:"Ph.D.",name:"Sergey",middleName:null,surname:"Sedykh",slug:"sergey-sedykh",fullName:"Sergey Sedykh"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"8545",title:"Animal Reproduction in Veterinary Medicine",subtitle:null,isOpenForSubmission:!1,hash:"13aaddf5fdbbc78387e77a7da2388bf6",slug:"animal-reproduction-in-veterinary-medicine",bookSignature:"Faruk Aral, Rita Payan-Carreira and Miguel Quaresma",coverURL:"https://cdn.intechopen.com/books/images_new/8545.jpg",editedByType:"Edited by",editors:[{id:"25600",title:"Prof.",name:"Faruk",middleName:null,surname:"Aral",slug:"faruk-aral",fullName:"Faruk Aral"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"9569",title:"Methods in Molecular Medicine",subtitle:null,isOpenForSubmission:!1,hash:"691d3f3c4ac25a8093414e9b270d2843",slug:"methods-in-molecular-medicine",bookSignature:"Yusuf Tutar",coverURL:"https://cdn.intechopen.com/books/images_new/9569.jpg",editedByType:"Edited by",editors:[{id:"158492",title:"Prof.",name:"Yusuf",middleName:null,surname:"Tutar",slug:"yusuf-tutar",fullName:"Yusuf Tutar"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}]},subject:{topic:{id:"1039",title:"Immunopathology",slug:"immunology-allergology-and-rheumatology-immunopathology",parent:{title:"Immunology, Allergology and Rheumatology",slug:"immunology-allergology-and-rheumatology"},numberOfBooks:5,numberOfAuthorsAndEditors:93,numberOfWosCitations:28,numberOfCrossrefCitations:22,numberOfDimensionsCitations:54,videoUrl:null,fallbackUrl:null,description:null},booksByTopicFilter:{topicSlug:"immunology-allergology-and-rheumatology-immunopathology",sort:"-publishedDate",limit:12,offset:0},booksByTopicCollection:[{type:"book",id:"9607",title:"Immunosuppression",subtitle:null,isOpenForSubmission:!1,hash:"9e4a6d6f6a85696f31c1afb3edba3306",slug:"immunosuppression",bookSignature:"Xuehui He",coverURL:"https://cdn.intechopen.com/books/images_new/9607.jpg",editedByType:"Edited by",editors:[{id:"284559",title:"Dr.",name:"Xuehui",middleName:null,surname:"He",slug:"xuehui-he",fullName:"Xuehui He"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"8269",title:"New Insights into Systemic Sclerosis",subtitle:null,isOpenForSubmission:!1,hash:"76a423b1edee17156cff61414de76079",slug:"new-insights-into-systemic-sclerosis",bookSignature:"Michal Tomcik",coverURL:"https://cdn.intechopen.com/books/images_new/8269.jpg",editedByType:"Edited by",editors:[{id:"193284",title:"Dr.",name:"Michal",middleName:null,surname:"Tomcik",slug:"michal-tomcik",fullName:"Michal Tomcik"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"4587",title:"Immunopathology and Immunomodulation",subtitle:null,isOpenForSubmission:!1,hash:"0346bffd3a481c57a940d89686b53e32",slug:"immunopathology-and-immunomodulation",bookSignature:"Krassimir Metodiev",coverURL:"https://cdn.intechopen.com/books/images_new/4587.jpg",editedByType:"Edited by",editors:[{id:"141685",title:"Distinguished Prof.",name:"Krassimir",middleName:null,surname:"Metodiev",slug:"krassimir-metodiev",fullName:"Krassimir Metodiev"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"2026",title:"Inflammatory Diseases",subtitle:"Immunopathology, Clinical and Pharmacological Bases",isOpenForSubmission:!1,hash:"55567318dc2901acbc8cdbab9c48feef",slug:"inflammatory-diseases-immunopathology-clinical-and-pharmacological-bases",bookSignature:"Mahin Khatami",coverURL:"https://cdn.intechopen.com/books/images_new/2026.jpg",editedByType:"Edited by",editors:[{id:"63956",title:"Dr.",name:"Mahin",middleName:null,surname:"Khatami",slug:"mahin-khatami",fullName:"Mahin Khatami"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"2027",title:"Inflammatory Diseases",subtitle:"A Modern Perspective",isOpenForSubmission:!1,hash:"eb1a244125407385f6b1151815c08f5f",slug:"inflammatory-diseases-a-modern-perspective",bookSignature:"Amit Nagal",coverURL:"https://cdn.intechopen.com/books/images_new/2027.jpg",editedByType:"Edited by",editors:[{id:"63003",title:"Dr.",name:"Amit",middleName:null,surname:"Nagal",slug:"amit-nagal",fullName:"Amit Nagal"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}],booksByTopicTotal:5,mostCitedChapters:[{id:"49169",doi:"10.5772/61326",title:"Platelet-rich Plasma (PRP) in Orthopedics and Traumatology — Review",slug:"platelet-rich-plasma-prp-in-orthopedics-and-traumatology-review",totalDownloads:1818,totalCrossrefCites:3,totalDimensionsCites:5,book:{slug:"immunopathology-and-immunomodulation",title:"Immunopathology and Immunomodulation",fullTitle:"Immunopathology and Immunomodulation"},signatures:"Pencho Kossev and Tsvetan Sokolov",authors:[{id:"175492",title:"Dr.",name:"Tsvetan",middleName:null,surname:"Sokolov",slug:"tsvetan-sokolov",fullName:"Tsvetan Sokolov"}]},{id:"28059",doi:"10.5772/25658",title:"Inflammation in Age-Related Macular Degeneration – Implications for Therapy",slug:"inflammation-in-age-related-macular-degeneration-implications-for-therapy",totalDownloads:2069,totalCrossrefCites:1,totalDimensionsCites:3,book:{slug:"inflammatory-diseases-immunopathology-clinical-and-pharmacological-bases",title:"Inflammatory Diseases",fullTitle:"Inflammatory Diseases - Immunopathology, Clinical and Pharmacological Bases"},signatures:"Mei Chen and Heping Xu",authors:[{id:"64019",title:"Dr.",name:"Heping",middleName:null,surname:"Xu",slug:"heping-xu",fullName:"Heping Xu"},{id:"64045",title:"Dr.",name:"Mei",middleName:null,surname:"Chen",slug:"mei-chen",fullName:"Mei Chen"}]},{id:"25194",doi:"10.5772/25707",title:"The Value of the Cytokinome Profile",slug:"the-value-of-the-cytokinome-profile",totalDownloads:1716,totalCrossrefCites:2,totalDimensionsCites:3,book:{slug:"inflammatory-diseases-a-modern-perspective",title:"Inflammatory Diseases",fullTitle:"Inflammatory Diseases - A Modern Perspective"},signatures:"Susan Costantini, Ankush Sharma and Giovanni Colonna",authors:[{id:"64250",title:"Dr.",name:"Susan",middleName:null,surname:"Costantini",slug:"susan-costantini",fullName:"Susan Costantini"},{id:"64931",title:"Dr.",name:"Giovanni",middleName:null,surname:"Colonna",slug:"giovanni-colonna",fullName:"Giovanni Colonna"},{id:"113473",title:"Dr.",name:"Ankush",middleName:null,surname:"Sharma",slug:"ankush-sharma",fullName:"Ankush Sharma"}]}],mostDownloadedChaptersLast30Days:[{id:"49383",title:"Probiotics and Immunity",slug:"probiotics-and-immunity",totalDownloads:1991,totalCrossrefCites:1,totalDimensionsCites:1,book:{slug:"immunopathology-and-immunomodulation",title:"Immunopathology and Immunomodulation",fullTitle:"Immunopathology and Immunomodulation"},signatures:"Marieta Georgieva, Kaloyan Georgiev and Peter Dobromirov",authors:[{id:"175562",title:"Dr.",name:"Kaloyan",middleName:"D.",surname:"Georgiev",slug:"kaloyan-georgiev",fullName:"Kaloyan Georgiev"},{id:"175564",title:"Dr.",name:"Marieta",middleName:null,surname:"Georgieva",slug:"marieta-georgieva",fullName:"Marieta Georgieva"},{id:"179750",title:"Dr.",name:"Peter",middleName:null,surname:"Dobromirov",slug:"peter-dobromirov",fullName:"Peter Dobromirov"}]},{id:"48875",title:"Bruton’s Disease",slug:"bruton-s-disease",totalDownloads:1538,totalCrossrefCites:0,totalDimensionsCites:0,book:{slug:"immunopathology-and-immunomodulation",title:"Immunopathology and Immunomodulation",fullTitle:"Immunopathology and Immunomodulation"},signatures:"Yıldız Camcıoğlu",authors:[{id:"147283",title:"Dr.",name:"Yildiz",middleName:null,surname:"Camcioglu",slug:"yildiz-camcioglu",fullName:"Yildiz Camcioglu"}]},{id:"49165",title:"Principles of Cancer Immunobiology and Immunotherapy of Solid Tumors",slug:"principles-of-cancer-immunobiology-and-immunotherapy-of-solid-tumors",totalDownloads:1750,totalCrossrefCites:1,totalDimensionsCites:3,book:{slug:"immunopathology-and-immunomodulation",title:"Immunopathology and Immunomodulation",fullTitle:"Immunopathology and Immunomodulation"},signatures:"Assia Konsoulova",authors:[{id:"175505",title:"Dr.",name:"Assia",middleName:null,surname:"Konsoulova",slug:"assia-konsoulova",fullName:"Assia Konsoulova"}]},{id:"49544",title:"Biological Concepts on Bisphosphonate Treated Patients in the Context of Increasing Patient Life Quality and the Need for Oral Surgical Procedures",slug:"biological-concepts-on-bisphosphonate-treated-patients-in-the-context-of-increasing-patient-life-qua",totalDownloads:1507,totalCrossrefCites:0,totalDimensionsCites:0,book:{slug:"immunopathology-and-immunomodulation",title:"Immunopathology and Immunomodulation",fullTitle:"Immunopathology and Immunomodulation"},signatures:"Metodi Abadzhiev",authors:[{id:"175617",title:"Dr.",name:"Metodi",middleName:null,surname:"Abadzhiev",slug:"metodi-abadzhiev",fullName:"Metodi Abadzhiev"}]},{id:"28066",title:"Relationship Between Protein Oxidation Markers and Oxidative Stress Biomarkers",slug:"relationship-between-protein-oxidation-markers-and-oxidative-stress-biomarkers",totalDownloads:2977,totalCrossrefCites:0,totalDimensionsCites:1,book:{slug:"inflammatory-diseases-immunopathology-clinical-and-pharmacological-bases",title:"Inflammatory Diseases",fullTitle:"Inflammatory Diseases - Immunopathology, Clinical and Pharmacological Bases"},signatures:"Silvia Clara Kivatinitz",authors:[{id:"63625",title:"Prof.",name:"Silvia",middleName:null,surname:"Kivatinitz",slug:"silvia-kivatinitz",fullName:"Silvia Kivatinitz"}]},{id:"49408",title:"Multicentric Castleman’s Disease",slug:"multicentric-castleman-s-disease",totalDownloads:1081,totalCrossrefCites:0,totalDimensionsCites:1,book:{slug:"immunopathology-and-immunomodulation",title:"Immunopathology and Immunomodulation",fullTitle:"Immunopathology and Immunomodulation"},signatures:"Moosa Patel, Vinitha Philip, Atul Lakha, Sugeshnee Pather,\nMuhammed Faadil Waja, Lucille Singh and Mohamed Arbee",authors:[{id:"149189",title:"Prof.",name:"Moosa",middleName:null,surname:"Patel",slug:"moosa-patel",fullName:"Moosa Patel"},{id:"177638",title:"Dr.",name:"Vinitha",middleName:null,surname:"Philip",slug:"vinitha-philip",fullName:"Vinitha Philip"},{id:"177639",title:"Dr.",name:"Atul",middleName:null,surname:"Lakha",slug:"atul-lakha",fullName:"Atul Lakha"},{id:"177640",title:"Dr.",name:"Sugeshnee",middleName:null,surname:"Pather",slug:"sugeshnee-pather",fullName:"Sugeshnee Pather"},{id:"177641",title:"Dr.",name:"Muhammed Faadil",middleName:null,surname:"Waja",slug:"muhammed-faadil-waja",fullName:"Muhammed Faadil Waja"},{id:"177642",title:"Dr.",name:"Lucille",middleName:null,surname:"Singh",slug:"lucille-singh",fullName:"Lucille Singh"},{id:"177643",title:"Dr.",name:"Mohamed",middleName:null,surname:"Arbee",slug:"mohamed-arbee",fullName:"Mohamed Arbee"}]},{id:"71107",title:"Role of Hybrid Operating Room: Present and Future",slug:"role-of-hybrid-operating-room-present-and-future",totalDownloads:191,totalCrossrefCites:0,totalDimensionsCites:0,book:{slug:"immunosuppression",title:"Immunosuppression",fullTitle:"Immunosuppression"},signatures:"Evan Qize Yuan and Calvin Sze Hang Ng",authors:null},{id:"68295",title:"Gastrointestinal Involvement in Systemic Sclerosis: Overview, Neglected Aspects, Malnutrition, Body Composition and Management",slug:"gastrointestinal-involvement-in-systemic-sclerosis-overview-neglected-aspects-malnutrition-body-comp",totalDownloads:361,totalCrossrefCites:0,totalDimensionsCites:0,book:{slug:"new-insights-into-systemic-sclerosis",title:"New Insights into Systemic Sclerosis",fullTitle:"New Insights into Systemic Sclerosis"},signatures:"Sabina Oreska and Michal Tomcik",authors:null},{id:"71922",title:"Immunosuppression and Viral Infections",slug:"immunosuppression-and-viral-infections",totalDownloads:162,totalCrossrefCites:0,totalDimensionsCites:0,book:{slug:"immunosuppression",title:"Immunosuppression",fullTitle:"Immunosuppression"},signatures:"Seema Naik, Kevin Rakszawski, Joseph Cioccio, Hong Zheng and Hiroko Shike",authors:null},{id:"25193",title:"Expression and Role of the TrkA Receptor in Pulmonary Inflammatory Diseases",slug:"expression-and-role-of-the-trka-receptor-in-pulmonary-inflammatory-diseases",totalDownloads:2372,totalCrossrefCites:2,totalDimensionsCites:2,book:{slug:"inflammatory-diseases-a-modern-perspective",title:"Inflammatory Diseases",fullTitle:"Inflammatory Diseases - A Modern Perspective"},signatures:"Véronique Freund-Michel, Bernard Muller and Nelly Frossard",authors:[{id:"64018",title:"Dr.",name:"Véronique",middleName:null,surname:"Freund-Michel",slug:"veronique-freund-michel",fullName:"Véronique Freund-Michel"},{id:"69340",title:"Prof.",name:"Bernard",middleName:null,surname:"Muller",slug:"bernard-muller",fullName:"Bernard Muller"},{id:"69341",title:"Dr.",name:"Nelly",middleName:null,surname:"Frossard",slug:"nelly-frossard",fullName:"Nelly Frossard"}]}],onlineFirstChaptersFilter:{topicSlug:"immunology-allergology-and-rheumatology-immunopathology",limit:3,offset:0},onlineFirstChaptersCollection:[],onlineFirstChaptersTotal:0},preDownload:{success:null,errors:{}},aboutIntechopen:{},privacyPolicy:{},peerReviewing:{},howOpenAccessPublishingWithIntechopenWorks:{},sponsorshipBooks:{sponsorshipBooks:[{type:"book",id:"10176",title:"Microgrids and Local Energy Systems",subtitle:null,isOpenForSubmission:!0,hash:"c32b4a5351a88f263074b0d0ca813a9c",slug:null,bookSignature:"Prof. Nick Jenkins",coverURL:"https://cdn.intechopen.com/books/images_new/10176.jpg",editedByType:null,editors:[{id:"55219",title:"Prof.",name:"Nick",middleName:null,surname:"Jenkins",slug:"nick-jenkins",fullName:"Nick Jenkins"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter"}}],offset:8,limit:8,total:1},route:{name:"profile.detail",path:"/profiles/13551/lorenzo-tardon",hash:"",query:{},params:{id:"13551",slug:"lorenzo-tardon"},fullPath:"/profiles/13551/lorenzo-tardon",meta:{},from:{name:null,path:"/",hash:"",query:{},params:{},fullPath:"/",meta:{}}}},function(){var e;(e=document.currentScript||document.scripts[document.scripts.length-1]).parentNode.removeChild(e)}()