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射孔新技术--高性能射孔模型

石油工业计算机应用 2017年第3期25卷 16-25页

作者： carlos baumann alfredo fayard brenden grove jeremy harvey wenbo yang amit govil andy martin roberto franco mendez garcia arturo ramirez rodriquez jock munro cesar velez terrazas lang zhan 美国得克萨斯州Rosharon 挪威Tananger 英国剑桥墨西哥国家石油公司(pemex) 墨西哥韦拉克鲁斯Agua Dulce 苏格兰阿伯丁墨西哥塔巴斯科州Villahermosa 壳牌石油公司得克萨斯州休斯顿

爆炸聚能射孔是一种在油气井中射穿套管来形成井筒和套管外岩石之间通道的技术。服务公司通过地面试验，将聚能射孔弹射入无应力水泥靶中，以了解其在已知条件下的射孔性能在认识到模拟程序可能无法正确预测井下聚能射孔弹的性能后，斯... 详细信息

爆炸聚能射孔是一种在油气井中射穿套管来形成井筒和套管外岩石之间通道的技术。服务公司通过地面试验，将聚能射孔弹射入无应力水泥靶中，以了解其在已知条件下的射孔性能在认识到模拟程序可能无法正确预测井下聚能射孔弹的性能后，斯伦贝谢的科研人员开发出了可精确计算射孔深度、射孔效率和系统动态响应的软件，并以此来优化在高应力岩石中聚能射孔弹的性能。

关键词：聚能射孔弹孔性能技术孔模型地面试验服务公司模拟程序已知条件

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射孔新技术——高性能射孔模型

国外测井技术 2017年第1期38卷 61-71页

作者： Carlos Baumann Alfredo Fayard Brenden Grove Jeremy Harvey Wenbo Yang amit govil Andy Martin Roberto Franco Mendez Garcia Arturo Ramirez Rodriquez Jock Munro Cesar Velez Terrazas Lang Zhan 斯伦贝谢公司

爆炸聚能射孔是一种在油气井中射穿套管来形成井筒和套管外岩石之间通道的技术。服务公司通过地面试验，将聚能射孔弹射入无应力水泥靶中，以了解其在已知条件下的射孔性能。在认识到模拟程序可能无法正确预测井下聚能射孔弹的性能后，... 详细信息

爆炸聚能射孔是一种在油气井中射穿套管来形成井筒和套管外岩石之间通道的技术。服务公司通过地面试验，将聚能射孔弹射入无应力水泥靶中，以了解其在已知条件下的射孔性能。在认识到模拟程序可能无法正确预测井下聚能射孔弹的性能后，斯伦贝谢的科研人员开发出了可精确计算射孔深度、射孔效率和系统动态响应的软件，并以此来优化在高应力岩石中聚能射孔弹的性能。

关键词：射孔弹射孔枪模型分析井下条件射孔效率射孔密度作业者套管射孔预测模型渗透率

On Sharpening of a Theorem of Ankeny and Rivlin

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Analysis in Theory and Applications 2020年第2期36卷 225-234页

作者： Aseem Dalal N.K.govil Assistant Commissioner of Income Tax Ministry of FinanceGovernment of India Department of Mathematics&Statistics Auburn UniversityAuburnAL 36849-5108USA

Let p(z)=∑v^n=0avz^v anzn be a polynomial of degree n,M(p,R)=:max|z|=R≥0|p(z)|and M(p,1)=:||P||.Then according to a well-known result of Ankeny and Rivlin[1],we have for R≥1,M(p,R≤(R^n+1/2)||p||.This inequality has been sharpened by govil[4],who proved that for R≥1,M(p,R)≤(R^N+1/2)||p||-n/2(||p||^2-4|an|^2/||p||){(R-1)||p||/||p||+2|an|-ln(1+(R-1)||p||/||p||+2|an|)}.In this paper,we sharpen the above inequality of govil[4],which in turn sharpens the inequality of Ankeny and Rivlin[1].

关键词： Inequalities polynomials zeros

Solar insolation driven periodicities in southwest monsoon and its impact on NE Arabian Sea paleoceanography

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Geoscience Frontiers 2019年第6期10卷 2251-2263页

作者： Syed Azharuddin Pawan govil Arun Deo Singh Ravi Mishra Mayank Shekhar Birbal Sahni Institute of Palaeosciences LucknowU.P.226007India Department of Geology Banaras Hindu UniversityVaranasi221005India National Centre for Antarctic and Ocean Research Vasco-da-GamaGoa403804India

In the northeastern(NE) Arabian Sea,the fluctuation in terrestrial and freshwater runoff directly depends on southwest monsoon(SWM) precipitation as well as the meltwater flux provided by Indus River.Therefore,analysis of multi-proxy spectral signatures was carried out to trace the high-resolution SWM periodicities and their influence on the productivity,regional sea level fluctuations and depositional processes in the NE Arabian Sea.The time series data of stable isotopes of oxygen(δ^18 O(G.ruber)).carbon(δ^13 C(G.ruber) and δ^13 C(org)) and nitrogen(δ^15 N).Total Organic Carbon(TOC),planktic-benthic foraminiferal ratio(P/B ratio) and>63 μm coarse fraction(CF) were used from two coastal sedimentary cores located offshore Saurashtra,NE Arabian Sea(Core SK-240/485 having 88 m water depth;Core GC/SK-240/496 having 174 m water depth).The REDFIT based spectral analysis recorded significant periodicities(>90% significance) in δ^18 0 time series centered at^1609,~667,~525,~296,~290 and^256 years.Further,the significant periodicities recorded in carbon isotopes time series(δ^13 C(G.ruber) and δ^13 C(org))centered at^681,~512,~471,~452,~438,~360,~292,~275,~269,~245 and^209 years.The significant periodicities in TOC include^471 and-322 years whereas δ^15 N time series recorded significant periodicity centered at-360 years.The significant periodicities in P/B ratio time series centered at^512,~388,~304,~250,~235,~217,~152,~139 and^135 years while CF recorded^268,~216,~209,~198,~188,~173 and^140 years significant periodicities.The observed periodicities in the multi-proxy record consist of similar cycles(within the radiocarbon dating error) which also natch with previously reported solar insolation influenced SWM and other global and regional cycles.Further,the stationarity of the data has been verified using wavelet analysis and shows similar periodicities as observed in REDFIT analysis.Thereafter,the depositional behaviour was studied using correlation analysis of the common periods of δ^18 0 time series of both the cores

关键词： Southwest monsoon Periodicities Arabian sea Spectral analysis Foraminifera

Learning Computer Graphics: From 3D Models to Animated Movies on Your PC 1

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Some Sharpening and Generalizations of a Result of T. J. Rivlin

1998年

作者： Shalini govil-Pai Rajesh Pai (auth.)

来源：畅想之星图书光盘版（南... 评论

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Analysis in Theory and Applications 2017年第3期33卷 219-228页

作者： N.K.govil Eze R.Nwaeze Department of Mathematics and Statistics Auburn University Department of Mathematics Tuskegee University

Let p（z） = a0＋a1z＋a2z^2＋a3z3＋…＋anz^n be a polynomial of degree n. Rivlin [12] proved that if p （z） ≠ 0 in the unit disk, then for 0 〈 r ≤ 1,max（｜r＋1｜/2）^n max｜p（z）｜.｜z｜=1In this paper, we prove a sharpening and generalization of this result and show by means of examples that for some polynomials our result can significantly improve the bound obtained by the Rivlin＇s Theorem.

关键词： Inequalities polynomials zeros.

Evaluation of an asymptomatic COVID-19 patient post-surgery with chest radiography: A surgeon’s dilemma

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World Journal of Virology 2021年第6期10卷 326-328页

作者： Gaurav govil Lavindra Tomar Pawan Dhawan Department of Orthopaedics Max Super Speciality HospitalPatparganjDelhi 110092India

Routine chest radiography is not a requirement in post-surgery cardiac bypass patients.However,the safety of abandoning routine chest radiographs in critically ill patients remains uncertain.Surgery in an asymptomatic coronavirus disease 2019(COVID-19)patient presents additional challenges in postoperative management.Chest radiography remains a valuable tool for assessment of all patients,even a stable one.Management of surgical patients as an emergency in an asymptomatic COVID-19 case remains a surgeon’s dilemma.

关键词： COVID-19 Cardiac surgery Radiography Critical care Chest radiography Intensive care Postoperative

Domestic Violence against Elderly People: A Case Study of India

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Advances in Aging Research 2016年第5期5卷 110-121页

作者： Punita govil Swati Gupta Aligarh Muslim University (A.M.U.) Aligarh India

The present demographic scenario of the country shows the rising trend of adult population. According to census report 2011, there are 60.3% people belonging to 15 to 59 years of age group and the percentage of people above 60+ age is 8.6%. Our country fails to provide due respect, care, affection, security and health related facilities, which elderly people utmost require. A number of cases of adult abuses are reported in news papers as these people are easy victims of violence and criminal activities. The society comes to know about only those problems, which are reported, the innumerable cases of disrespect and neglect are not given any consideration. The situation becomes all the more worst when perpetrators are very near relatives and in some cases blood relatives also. This growing insensitiveness is a threat to our society. Sincere efforts are needed to tackle this alarming problem. The present paper describes the available data [1]-[3] on the old people, their dependence ratio, the problems being faced by them and suggestive measures to provide social and emotional security to them.

关键词： Domestic Violence Elderly Abuse Violent Offenders Bullying against Elders

SOME INEQUALITIES FOR POLYNOMIALS SATISFYING p(z)=z^n p(1/z)

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Analysis in Theory and Applications 1996年第2期12卷 40-44页

作者： B.Datt N.K.govil Haryana Agricultural University IndiaAuburn University USA

Let p(z)=be a polynomial degree n and let Then accord-ing to Bernstein's inequality ||p'|| 详细信息

Let p(z)=be a polynomial degree n and let Then accord-ing to Bernstein's inequality ||p'||

关键词： SOME INEQUALITIES FOR POLYNOMIALS SATISFYING p z~n p