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