Referral - timely escalation using the principles of the right patient, right professional, right time. 36 Full PDFs related to this paper. Quantitative Seismology 2nd Edition Keiiti Aki Observatoire Volcanologique du Piton de la Fournaise Paul G. Richards Lamont-Doherty Earth Observatory. The AkiRichards equation is an important linear approximation of the Zoeppritz equations. Keiiti Aki ( , Aki Keiichi, March 3, 1930 May 17, 2005) was a Japanese-American professor of Geophysics at the Massachusetts Institute of Technology (MIT), and then at the University of Southern California (USC), seismologist, author and mentor.He and Paul G. Richards coauthored "Quantitative Seismology: theory and methods".. Aki was born in Yokohama, Japan. This is a good article. In high school, she was a member of the rocks and minerals club. Download. It is valid for reflection angles up to about 40. If you continue without changing your browser settings, you consent to our use of cookies in accordance with our cookie policy. Avseth, P, T Mukerji, G Mavko (2006), Quantitative Seismic Interpretation, Cambridge University Press. where the 'delta' expressions are, for example: where 1 is the density of the upper layer, and 2 is the same property for the lower layer, and VP1 is the P-wave velocity of the upper layer. Chapter 1: Introduction . Seismic data analysis is the most important and most commonly used tool used in the oil and gas industry to find hydrocarbon reserves. We reviewed the health records for all patients These equations are very complicated to solve, so Aki & Richards (1980[1]) gave linear approximations to them. It is valid for reflection angles up to about 40. Please see Wikipedia's template documentation for further citation fields that may be required. This paper. Aki Shinkai (, Shinkai Aki?) An even simpler approximation is the Shuey approximation.. Adapted from Avseth et al (2006): 1. Download PDF. The reflection coefficient for plane elastic waves varies with incidence angle, as described by the Zoeppritz equations. 1 Obituary Keiiti Aki (1930 2005) Seismologist and leader Everyone called him Kei, the intellectual leader who for forty years brought new methods to a K. Aki and P. G. Richards, Quantitative Seismology, University Science Books, Sausalito, 2002. has been cited by the following article: TITLE: A Wavelet Transform Method to Detect P and S-Phases in Three Component Seismic Data. Avseth, P, T Mukerji, G Mavko (2006), Quantitative Seismic Interpretation, Cambridge University Press. The AkiRichards equation is an important linear approximation of the Zoeppritz equations. Response - early identification and swift treatment of the underlying cause; 3. A short summary of this paper. 1: Theory and Methods (9780716710585) by Keiiti Aki; Paul G. Richards and a great selection of similar New, Used Now in one volume, the book provides a unified treatment of seismological methods that will be of use to advanced students, seismologists, and scientists and engineers working in all areas of seismology. Paul G. Richards (born March 1943) is an English-born, American seismologist who has made fundamental contributions to the theory of seismic wave link propagation and in methods to understand how the recorded shapes of seismic waves are affected by processes of diffraction, attenuation and scattering. Y = 1 2 V P 2 V P 2 {\displaystyle Y={\frac {1}{2}}{\frac {\Delta V_{\mathrm {P} }^{2}}{V_{\mathrm {P} }^{2}}} Table of Contents 1. It is valid for reflection angles up to about 40. An even simpler approximation is the Shuey approximation. Various authors have since derived slightly different versions of these approximations. We also use partner advertising cookies to deliver targeted, geophysics-related advertising to you; these cookies are not added without your direct consent. Avseth's formulation is called bruges.reflection.akirichards. X = 2 V S 2 V P 1 2 {\displaystyle X=2{\frac {V_{\mathrm {S} }^{2}}{V_{\mathrm {P1} }^{2}}}{\frac {\Delta \rho }{\rho }}} 1. Some of these approximations have been implemented in Agile's bruges Python library. Published in Seismological Review Letters, 76, 551553, issue of Sept/Oct 2005. This website uses cookies. Sometimes this is approximated by the incident angle. The traditional diagnostic criteria of renal failure in these patients were proposed in 19961 and have been refined in subsequent years.2 According to these criteria, ARF is defined as an increase in serum creatinine (sCr) of 50% from baseline to a final value >1.5 mg/dL (133 mol/L). Aki&Richards_Quantitative_Seismology. This study describes the presentation, risk factors and outcomes of AKI in patients hospitalized with Covid-19. READ PAPER. Define acute renal failure (ARF). Author summary Why was this study done? A subset of patients develop severe AKI and require renal replacement therapy (RRT). Richard N. Fine, MD* 1. (16). For small contrasts and small angles, the approximations can be given as:[citation needed], where is the PP incident angle in units of radians, and. This updated version of Aki and Richard's classical geophysical text deserves a place in every serious geophysicist's library." Click here for more information. It is valid for reflection angles up to about 40. K. Aki and P. G. Richards, Quantitative Seismology: Theory and Methods, W. H. Freeman & Co., New York, 1980. has been cited by the following article: TITLE: Effect of Point Source, Self-Reinforcement and Heterogeneity on the Propagation of Magnetoelastic Shear Wave. The rate of acute kidney injury (AKI) associated with patients hospitalized with Covid-19, and associated outcomes are not well understood. ### What you need to know Acute kidney injury (AKI), a sudden reduction in kidney function, is seen in some people with covid-19 infection. Now in one volume, the book provides a unified treatment of seismological methods that will be of use to advanced students, seismologists, and scientists and engineers working in all areas of seismology. The reflection coefficient for plane elastic waves varies with incidence angle, as described by the Zoeppritz equations. REFERENCES Aki K and Richards PG 1980 Quantitatiie seismology theory and from ENG 12 at Memorial University of Newfoundland 4. Acute kidney injury (AKI), a sudden reduction in kidney function, is seen in some people with covid-19 infection. Zoeppritz Equations, Aki-Richards Approximation, Hydrocarbon Detection, Drilling Risk Mitigation. Differentiate the three forms of ARF. Learn more. A subset of patients develop severe AKI and require renal replacement therapy (RRT). Quantitative Seismology, 2nd Edition, by Aki & Richards, University Science Books, 2002. Acute renal failure (ARF) is a common complication in patients with decompensated cirrhosis. AbeBooks.com: Quantitative Seismology, Vol. It appeared in one volume that was a substantial rewrite of the original two-volume first edition. 9 Reviews. where the 'delta' expressions are, for example: where 1 is the density of the upper layer, and 2 is the same property for the lower layer, and VP1 is the P-wave velocity of the upper layer. 1 . 1. The AkiRichards equation is an important linear approximation of the Zoeppritz equations. The second edition of the Aki-Richards textbook was published by University Science Books in August 2002 as a hardback. All patients presenting with AKI should be discussed with a doctor and management plans put into place. ----The Leading Edge "The continued popularity of this text is testament to the meticulous detail with which important mathematical formulas are derived; there simply is nothing of any importance that is glossed over or omitted." These equations are very complicated to solve, so Aki & Richards (1980[1]) gave linear approximations to them. & Richards, Paul G. 1980, Quantitative seismology : theory and methods / Keiiti Aki, Paul G. Richards W. H. Freeman San Francisco. An even simpler approximation is the Shuey approximation. 3. Recommendations on the management of AKI direct particular attention to relieving urological obstruction, pharmacological man Contrast-induced acute kidney injury (CI-AKI) occurs in 7% of all patients and in >25% of high risk patients undergoing coronary angiography. 1 Appearance 2 Personality 3 History 4 Story Aki and Shouko went to elementary and middle school together. Sometimes this is approximated by the incident angle. Wikipedia Citation. Kei Aki, left, and Paul Richards on the occasion of Kei Aki's retirement from academia. Yy Jj. This page was last edited on 26 March 2015, at 17:27. is the childhood friend of Shouko Tanimoto and the prima ballerina at the Kataura Ballet Company. Table of Contents 1. His distinguished career included faculty appointments for many years at the Massachusetts Institute of Technology and the University of Southern California. http://subsurfwiki.org/index.php?title=AkiRichards_equation&oldid=15686. This new edition of the classic text by Aki and Richards has at last been updated throughout to systematically explain key concepts in seismology. For patients to have a good outcome from AKI, there must be: 1. University Science Books, 2002 - Science - 700 pages. Objectives: We aimed to evaluate the association between levosimendan treatment and acute kidney injury (AKI) as well as assess the clinical sequelae of AKI in cardiac surgery patients with depressed LV function (ejection fraction < 35%). An even simpler approximation is the Shuey approximation. Richard is currently the Chair of Think Kidneys AKI Board and was NHS Englands National Clinical Director (Renal) until March 2016. Initiate treatment, including stabilization, of a patient who has ARF. Aki&Richards_Quantitative_Seismology. Various authors have since derived slightly different versions of these approximations. When the level of significance is 0.05, we know that 2 Aki and Richards (2002) described the relationships among the seismic moment (M o ) and the length, width, and slip of the source. Recognition - early detection; 2. This page was last edited on 28 November 2017, at 16:34. Aki&Richards_Quantitative_Seismology. Avseth's formulation is called agilegeo.avo.reflection.akirichards. Keiiti Aki, Paul G. Richards. He continues as Clinical Co-Chair for Specialised Internal Medicine and Consultant Nephrologist at Derby Hospitals NHS Foundation Trust. Introduction Suggestions for Further Reading 2. https://wiki.seg.org/index.php?title=Aki-Richards_equation&oldid=24019, Problems in Exploration Seismology & their Solutions, the Creative Commons Attribution-ShareAlike 3.0 Unported License (CC-BY-SA). *State University of New York at Stony Brook, NY After completing this article, readers should be able to: 1. The AkiRichards equation is an important linear approximation of the Zoeppritz equations. Download Full PDF Package. There is a need to better understand risk factors for AKI in patients with COVID-19. The one you use might depend on the required accuracy, or what the software you're using happens to have implemented. Notice that the in the third term is the mean of the incident and transmission angles. R ( ) = W X sin 2 + Y 1 cos 2 a v g Z sin 2 {\displaystyle R(\theta )=W-X\sin ^{2}\theta +Y{\frac {1}{\cos ^{2}\theta _{\mathrm {avg} }}}-Z\sin ^{2}\theta } where 1. 2. Recent reports have suggested that some patients with Coronavirus Disease 2019 (COVID-19) develop acute kidney injury (AKI). W = 1 2 {\displaystyle W={\frac {1}{2}}{\frac {\Delta \rho }{\rho }}} 1. Discuss the various medications necessary for treating a patient who has ARF. AUTHORS: Salam Al-Hashmi, Adrian Rawlins, Frank Vernon You can disable cookies at any time. For small contrasts and small angles, the approximations can be given as:[citation needed], where is the PP incident angle in units of radians, and, Some of these approximations have been implemented in Agile Geoscience's agilegeo Python library.[3]. This new edition of the classic text by Aki and Richards has at last been updated throughout to systematically explain key concepts in seismology. It is also unclear if AKI in patients with COVID-19 differs from AKI due to other causes. Dilys A. Whyte, MD* 2. Notice that the in the third term is the mean of the incident and transmission angles. Until his death in 2005, Keiiti Aki resided on Runion Island in the Indian Ocean. The one you use might depend on the required accuracy, or what the software you're using happens to have implemented. 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