检索结果-南通市图书馆

Wave Interaction and Resonance in a Non-Ideal Gas

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2012年第12期29卷 5-8页

作者： Rajan Arora Mohd.Junaid Siddiqui v.p.singh Department of Applied Science and Engineering IIT RoorkeeSaharanpur CampusSaharanpurUP-247001India

The method of multiple time scales is used to obtain the asymptotic solutions to the planar and non-planar flows into a non-ideal *** transport equations for the amplitudes of resonantly interacting high frequency wav... 详细信息

关键词： resonant planar asymptotic

Assessment of the role of slit as a safety valve in failure of levees

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2008年第4期23卷 361-375页

作者： C.S.p.OJHA v.p.singh D.D.ADRIAN Department of Civil Engineering Indian Institute of TechnologyRoorkee Uttaranchal 247667 IndiaProf. Caroline and William N. Lehrer Distinguished Chair in Water Engineering Professor of Civil & Environmental Engineering and Professor of Biological and Agricultural Engineering Texas A & M University2117 TAMU Dept. of Biological & Agric. Engineering 321 Scoates Hall College Station Texas 77843-2117 USA Department of Civil and Environmental Engineering Louisiana State UniversityBaton Rouge LA 70803-6405 U. S. A.Rubicon Professor

The development of a narrow channel or slit due to piping just underneath the base of levees channel has been reported to be useful to withstand the increase in the head beyond critical head conditions. Also, the maximum slit length has been emphasized to be up to half of the base width. By developing a model of critical head considering slit, it is found that the critical head can increase with the development of slit length only under certain conditions. Analysis of piping failure data indicates that the critical head expressions considering slit length constitute a potentially useful model for critical head.

关键词： Failure of levee piping Flood defense Water head seepage erosion

Influence of tool rotational speed on mechanical and corrosion behaviour of friction stir processed AZ31/Al_(2)O_(3)nanocomposite

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

镁合金学报(英文) 2023年第7期11卷 2585-2599页

作者： Ashish Kumar v.p.singh Akhileshwar Nirala R.C.singh Rajiv Chaudhary Abdel-Hamid I.Mourad B.K.Sahoo Deepak Kumar Department of Mechanical Engineering Delhi Technological UniversityDelhi 110042India Department of Mechanical Engineering Galgotias College of Engineering and Technology Greater Noida 201310India Department of Mechanical Engineering National Institute of Technology MizoramAizawl 796012India Department of Mechanical Engineering IES College of Technology Bhopal462044India Mechanical and Aerospace Engineering Department College of EngineeringUnited Arab Emirates UniversityAl-Ain 15551United Arab Emirates Materials Engineering Division CSIR-National Metallurgical Laboratory(NML)Jamshedpur831007India Department of Mechanical Engineering Carnegie Mellon UniversityPittsburghPA 15213USA

Nano-sized reinforcements improved the mechanical characteristics efficiently by promoting more implicit particle hardening mechanisms compared to micron-sized ***-sized particles lessen the critical particle solidification velocity for swamp and thus offers better *** the present investigation,the friction stir processing(FSp)is utilized to produce AZ31/Al_(2)O_(3)nanocomposites at various tool rotation speeds(i.e.,900,1200,and 1500 rpm)with an optimized 1.5%volume alumina(Al_(2)O_(3))reinforcement *** mechanical and corrosion behavior of AZ31/Al_(2)O_(3)-developed nanocomposites was investigated and compared with that of the AZ31 base *** AZ31 alloy experienced a comprehensive dynamic recrystallization during FSp,causing substantial grain ***-size strengthening is the primary factor contributed to the enhancement in the strength of the fabricated *** strength and yield strength values were lower than those for the base metal matrix,although an upward trend in both values has been observed with an increase in tool rotation *** 19.72%increase in hardness along with superior corrosion resistance was achieved compared to the base alloy at a tool rotational speed of 1500 *** corrosion currents(Jcorr)of all samples dropped with increase in the rotational speed,in contrast to the corrosion potentials(Ecorr),which *** values of Jcorr of AZ31/Al_(2)O_(3)were 42.3%,56.8%,and 65.5%lower than those of AZ31 alloy at the chosen rotating speeds of 900,1200,and 1500 rpm,*** corrosion behavior of friction stir processed nanocomposites have been addressed in this manuscript which has not been given sufficient attention in the existing ***,this work offers an effective choice for the quality assurance of the FSp process of AZ31/Al_(2)O_(3)*** obtained results are relevant to the development of lightweight automobile and aerospace structures and components

关键词： Friction stir processing AZ31 alloy Al_(2)O_(3) Nanocomposite Mechanical properties Corrosion resistance

Shielding effectiveness of boron-containing ores in Liaoning province of China against gamma rays and thermal neutrons

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2018年第4期29卷 155-162页

作者： Meng-Ge Dong Xiang-Xin Xue v.p.singh He Yang Zhe-Fu Li M.I.Sayyed Department of Resource and Environment School of Metallurgy Northeastern University Shenyang 110819China Department of physics Karnatak UniversityDharwad 580003 India Shanghai Institute of Applied physics Shanghai 201800China physics Department University of Tabuk Tabuk Saudi Arabia

In this study, the mass attenuation coefficient of boron-containing ores in the Liaoning province of China was calculated using Win XCOM software to investigate the shielding effectiveness of these ores against gamma rays. The mass attenuation coefficients were also calculated using MCNp-4 B code and compared with Win XCOM results; consequently, a good consistency between the results of Win XCOM and MCNp-4 B was observed. Furthermore, the G-p fitting method was used to evaluate the values of exposure buildup factor(EBF) in the energy range of 0.015–15 Me v up to 40 mean free paths. Among the selected ores, boron-bearing iron concentrate ore(M3)was determined to be the best gamma ray shielding ore owing to its higher values of mass attenuation coefficient and equivalent atomic number and lower value of ***, American Evaluated Nuclear Data File(ENDF/B-vII) was used to analyze the shielding effectivenessagainst thermal neutrons. It was determined that Szaibelyite(M2) is the best thermal neutron shielding *** study would be useful for demonstrating the potential of boron-containing ores for applications in the field of nuclear engineering and technology.

关键词： Exposure buildup factors Gamma ray Neutron Boron-containing ores G-p fitting method

Gamma-ray and neutron shielding efficiency of pb-free gadolinium-based glasses

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2016年第4期27卷 206-213页

作者： v.p.singh N.M.Badiger S.Kothan S.Kaewjaeng T.Korkut H.J.Kim J.Kaewkhao Department of physics Karnatak University Department of Radiologic Technology Faculty of Associated Medical SciencesChiang Mai University Department of Nuclear Energy Engineering Faculty of Engineering Sinop University Department of physics Kyungpook National University Center of Excellence in Glass Technology and Materials Science Nakhon Pathom Rajabhat University

The radiation shielding efficiency of material depends upon photon attenuation, exposure buildup factors and neutron removal capacity. A newly developed pb-free gadolinium-based glasses in compositions(80-x) B_2O_3-10 Si O_2-10 Ca O-x Gd_2O_3(where x = 15, 20, 25, 30 and35 mol%) had completely been investigated for their shielding efficiency with Geant4 simulation for mass attenuation coefficients and neutron total macroscopic cross section and by calculating exposure buildup *** exposure buildup factors for photon energy from 0.015 to 15 Me v had been calculated up to 40 mean free paths using five factors geometric progression method. The mass attenuation coefficients of the pb-free glasses were simulated for energies from 223 to 2614 ke v and compared with the possible available experimental results. The neutron shielding efficiency of these glasses was discussed by calculating neutron total macroscopic cross section for energies from 1 e v to 14.1 Me v. present investigations are found to be very useful for applications in nuclear engineering.

关键词：无铅玻璃屏蔽效率中子质量衰减系数 γ射线光子能量截面计算 Geant4

在线全文

学校读者我要写书评

暂无评论

水库洪水波传播的波速分析

水电能源科学 1993年第3期11卷 152-164页

作者：李记译 v.p.singh 武汉水利电力大学路易斯安那州立大学

本文对水库洪水波传播的波速进行了研究。结果表明:运动波波速代表洪峰处的传播速度,而惯性波波速则代表波锋处的传播速度;天然河道或水库河流区观测的洪峰波速是运动波波速,而在水库平水区通过闸门启闭观测到的波速则是惯性波波锋处的... 详细信息

本文对水库洪水波传播的波速进行了研究。结果表明:运动波波速代表洪峰处的传播速度,而惯性波波速则代表波锋处的传播速度;天然河道或水库河流区观测的洪峰波速是运动波波速,而在水库平水区通过闸门启闭观测到的波速则是惯性波波锋处的传播速度。

关键词：水库洪水波波速分析

关于缅甸——四川地区三个地震序列的可能的前兆震群

在线全文

学校读者我要写书评

暂无评论

地震地质译丛 1983年第4期 28-31页

作者： v.p.singh 郑怡

Evison（1977）建立了前兆震群的震级（m;）与主震震级（m;）和前兆平静期之间的两种关系。本文选择了缅甸—四川地区进行研究,因为这个地区地震非常活跃。Kaila 和 Narain（1971）研究了该区的地震活动性,并指出,地震活动性的"A"值是6.... 详细信息

Evison（1977）建立了前兆震群的震级（m;）与主震震级（m;）和前兆平静期之间的两种关系。本文选择了缅甸—四川地区进行研究,因为这个地区地震非常活跃。Kaila 和 Narain（1971）研究了该区的地震活动性,并指出,地震活动性的"A"值是6.8-2.4。正如古登堡和里希特（1965）所报道的,该区发生过许多破坏性地震。鉴于地震活动性高和破坏性地震的频繁发生,可以认为该区是研究地震前兆最

关键词：前兆震群四川主震地震地震序列缅甸

一个具有蒸煮后米粒高度伸长和basmati品质的水稻品系——pusa 1121

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国外作物育种 2003年第1期22卷 12-13页

作者： v.p.singh 向平

培育basmati和非basmati杂交稻所有的恢复系和保持系的鉴定

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国外作物育种 2001年第1期20卷 5-7页

作者： A.K.Sarial v.p.singh