Download PDF. 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 Adapted from Avseth et al (2006): 1. 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). Avseth's formulation is called agilegeo.avo.reflection.akirichards. The Aki–Richards equation is an important linear approximation of the Zoeppritz equations. AbeBooks.com: Quantitative Seismology, Vol. When the level of significance is α ¼ 0.05, we know that χ 2 Aki and Richards (2002) described the relationships among the seismic moment (M o ) and the length, width, and slip of the source. Differentiate the three forms of ARF. For small contrasts and small angles, the approximations can be given as:[citation needed], where θ 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]. Aki Shinkai (新海亜貴, Shinkai Aki?) *State University of New York at Stony Brook, NY After completing this article, readers should be able to: 1. Aki&Richards_Quantitative_Seismology. Y = 1 2 Δ V P 2 V P 2 {\displaystyle Y={\frac {1}{2}}{\frac {\Delta V_{\mathrm {P} }^{2}}{V_{\mathrm {P} }^{2}}}… R ( θ ) = W − X sin 2 θ + Y 1 cos 2 θ a v g − Z sin 2 θ {\displaystyle R(\theta )=W-X\sin ^{2}\theta +Y{\frac {1}{\cos ^{2}\theta _{\mathrm {avg} }}}-Z\sin ^{2}\theta } where 1. Table of Contents 1. This study describes the presentation, risk factors and outcomes of AKI in patients hospitalized with Covid-19. 1 . These equations are very complicated to solve, so Aki & Richards (1980[1]) gave linear approximations to them. This paper. This is a good article. ----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." Wikipedia Citation. This page was last edited on 26 March 2015, at 17:27. (16). This updated version of Aki and Richard's classical geophysical text deserves a place in every serious geophysicist's library." Some of these approximations have been implemented in Agile's bruges Python library. Avseth, P, T Mukerji, G Mavko (2006), Quantitative Seismic Interpretation, Cambridge University Press. If you continue without changing your browser settings, you consent to our use of cookies in accordance with our cookie policy. An even simpler approximation is the Shuey approximation. Author summary Why was this study done? Sometimes this is approximated by the incident angle. Discuss the various medications necessary for treating a patient who has ARF. Avseth's formulation is called bruges.reflection.akirichards. The second edition of the Aki-Richards textbook was published by University Science Books in August 2002 as a hardback. It is also unclear if AKI in patients with COVID-19 differs from AKI due to other causes. Table of Contents 1. There is a need to better understand risk factors for AKI in patients with COVID-19. where the 'delta' expressions are, for example: where ρ1 is the density of the upper layer, and ρ2 is the same property for the lower layer, and VP1 is the P-wave velocity of the upper layer. Acute kidney injury (AKI), a sudden reduction in kidney function, is seen in some people with covid-19 infection. Learn more. The one you use might depend on the required accuracy, or what the software you're using happens to have implemented. You can disable cookies at any time. We also use partner advertising cookies to deliver targeted, geophysics-related advertising to you; these cookies are not added without your direct consent. A subset of patients develop severe AKI and require renal replacement therapy (RRT). 1 Appearance 2 Personality 3 History 4 Story Aki and Shouko went to elementary and middle school together. Download. An even simpler approximation is the Shuey approximation.. 9 Reviews. Recent reports have suggested that some patients with Coronavirus Disease 2019 (COVID-19) develop acute kidney injury (AKI). X = 2 V S 2 V P 1 2 Δ ρ ρ {\displaystyle X=2{\frac {V_{\mathrm {S} }^{2}}{V_{\mathrm {P1} }^{2}}}{\frac {\Delta \rho }{\rho }}} 1. Quantitative Seismology, 2nd Edition, by Aki & Richards, University Science Books, 2002. Seismic data analysis is the most important and most commonly used tool used in the oil and gas industry to find hydrocarbon reserves. 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%). http://subsurfwiki.org/index.php?title=Aki–Richards_equation&oldid=15686. 4. All patients presenting with AKI should be discussed with a doctor and management plans put into place. 3. Initiate treatment, including stabilization, of a patient who has ARF. 36 Full PDFs related to this paper. Avseth, P, T Mukerji, G Mavko (2006), Quantitative Seismic Interpretation, Cambridge University Press. Zoeppritz Equations, Aki-Richards Approximation, Hydrocarbon Detection, Drilling Risk Mitigation. Define acute renal failure (ARF). 1: Theory and Methods (9780716710585) by Keiiti Aki; Paul G. Richards and a great selection of similar New, Used … It is valid for reflection angles up to about 40°. Quantitative Seismology 2nd Edition Keiiti Aki Observatoire Volcanologique du Piton de la Fournaise Paul G. Richards Lamont-Doherty Earth Observatory. A subset of patients develop severe AKI and require renal replacement therapy (RRT). In high school, she was a member of the rocks and minerals club. READ PAPER. We reviewed the health records for all patients … University Science Books, 2002 - Science - 700 pages. where the 'delta' expressions are, for example: where ρ1 is the density of the upper layer, and ρ2 is the same property for the lower layer, and VP1 is the P-wave velocity of the upper layer. Yy Jj. This new edition of the classic text by Aki and Richards has at last been updated throughout to systematically explain key concepts in seismology. Response - early identification and swift treatment of the underlying cause; 3. Notice that the θ in the third term is the mean of the incident and transmission angles. It is valid for reflection angles up to about 40°. The one you use might depend on the required accuracy, or what the software you're using happens to have implemented. Until his death in 2005, Keiiti Aki resided on Réunion Island in the Indian Ocean. Notice that the θ in the third term is the mean of the incident and transmission angles. The reflection coefficient for plane elastic waves varies with incidence angle, as described by the Zoeppritz equations. AUTHORS: Salam Al-Hashmi, Adrian Rawlins, Frank Vernon The Aki–Richards equation is an important linear approximation of the Zoeppritz equations. Please see Wikipedia's template documentation for further citation fields that may be required. 2. 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. A short summary of this paper. The Aki–Richards equation is an important linear approximation of the Zoeppritz equations. It is valid for reflection angles up to about 40°. The Aki–Richards equation is an important linear approximation of the Zoeppritz equations. For small contrasts and small angles, the approximations can be given as:[citation needed], where θ is the PP incident angle in units of radians, and. 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. It appeared in one volume that was a substantial rewrite of the original two-volume first edition. 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 µmol/L). REFERENCES Aki K and Richards PG 1980 Quantitatiie seismology theory and from ENG 12 at Memorial University of Newfoundland An even simpler approximation is the Shuey approximation. 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. Contrast-induced acute kidney injury (CI-AKI) occurs in ≈7% of all patients and in >25% of high risk patients undergoing coronary angiography. The rate of acute kidney injury (AKI) associated with patients hospitalized with Covid-19, and associated outcomes are not well understood. This website uses cookies. 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. It is valid for reflection angles up to about 40°. Richard is currently the Chair of Think Kidneys AKI Board and was NHS England’s National Clinical Director (Renal) until March 2016. Aki&Richards_Quantitative_Seismology. His distinguished career included faculty appointments for many years at the Massachusetts Institute of Technology and the University of Southern California. Acute renal failure (ARF) is a common complication in patients with decompensated cirrhosis. An even simpler approximation is the Shuey approximation. 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. Richard N. Fine, MD* 1. Dilys A. Whyte, MD* 2. & Richards, Paul G. 1980, Quantitative seismology : theory and methods / Keiiti Aki, Paul G. Richards W. H. Freeman San Francisco. Various authors have since derived slightly different versions of these approximations. 1. Various authors have since derived slightly different versions of these approximations. Referral - timely escalation using the principles of the “right patient, right professional, right time”. Published in Seismological Review Letters, 76, 551–553, issue of Sept/Oct 2005. ### What you need to know Acute kidney injury (AKI), a sudden reduction in kidney function, is seen in some people with covid-19 infection. This page was last edited on 28 November 2017, at 16:34. These equations are very complicated to solve, so Aki & Richards (1980[1]) gave linear approximations to them. Click here for more information. is the childhood friend of Shouko Tanimoto and the prima ballerina at the Kataura Ballet Company. This new edition of the classic text by Aki and Richards has at last been updated throughout to systematically explain key concepts in seismology. Recommendations on the management of AKI direct particular attention to relieving urological obstruction, pharmacological man… The reflection coefficient for plane elastic waves varies with incidence angle, as described by the Zoeppritz equations. Introduction Suggestions for Further Reading 2. Kei Aki, left, and Paul Richards on the occasion of Kei Aki's retirement from academia. Chapter 1: Introduction . W = 1 2 Δ ρ ρ {\displaystyle W={\frac {1}{2}}{\frac {\Delta \rho }{\rho }}} 1. Keiiti Aki (安芸 敬一, 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. Download Full PDF Package. He continues as Clinical Co-Chair for Specialised Internal Medicine and Consultant Nephrologist at Derby Hospitals NHS Foundation Trust. Aki&Richards_Quantitative_Seismology. For patients to have a good outcome from AKI, there must be: 1. Recognition - early detection; 2. Sometimes this is approximated by the incident angle. Keiiti Aki, Paul G. Richards. Use might depend on the required accuracy, or what the software you using. In 2005, Keiiti AKI resided on Réunion Island in the third is... March 2015, at 17:27 the θ in the third term is the mean of the equations... 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