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Journal of Advanced Dielectrics 2019年第2期9卷 45-49页

作者： s.k.sinha s.kumari R.k.Chaudhary Department of Physics Birla Institute of TechnologyMesra Patna CampusPatna-800014India Department of Physics National Institute of Technology Jamshedpur-831016India

Incorporation of Te and Gd were done based on the stoicheometric formula PbTi_(0.8-x)Te_(0.2)Gd_(x)O_(3)(PTTeG).TG characterization of green powder revealed the completion of solid state reaction at temperature 450℃.XRD of modified PTTeG powders milled for 10 h was found most suitable as it gives pure single-phase tetragonal *** constant was found as 25 43 at curie temperature of 480℃in the case of 5 wt.%of Gd in *** Coefficient was found as 241×10^(-12)C/N at 39 kv/cm of poling *** results obtained were comparable and even better than so far reported in similar kind of materials.

关键词： Lead titanate high energy ball milling chalcogenide tellurium dielectrics.

some Experiments with Multivariate Objective Analysis scheme of Heights and Winds Using Optimum Interpolation

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Advances in Atmospheric sciences 1992年第4期9卷 431-440页

作者： s.k.sinha s.G.Narkhedkar D.R.Talwalkar s.Rajamani Indian Institute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 India

A two-dimensional, multitvariate objective analysis scheme for simultaneous analysis of geopotential height and wind fields has been developed over Indian and adjoining region for use in numerical weather prediction. The height-height correlations calculated using daily data of four July months (1976-1979), are used to derive the other autocorrelations and cross-correlations assuming geostropic relationship. A Gaussian function is used to model the autocorrelation function. since the scheme is multivariate the regression coefficients (weights) are *** the equator, the geostrophic approximation relating mass and wind is decoupled in a way similar to Bergman (1979). The objective analyses were made over Indian and adjoining region for 850, 700, 500, 300 and 200 hPa levels for the period from 4 July to 8 July 1979, 12 GMT. The analyses obtained using multivariate optimum interpolation scheme depict the synoptic situations satisfactorily. The analyses were also compared with the FGGE analyses (from ECMWF) and also with the station observations by computing the root mean square (RMs) errors and the RMs errors are comparable with those obtained in other similar studies.

关键词： In some Experiments with Multivariate Objective Analysis scheme of Heights and Winds Using Optimum Interpolation

Use of surface Observations to Estimate Upper Air Humidity for the Objective Analysis of Relative Humidity over Indian Region

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Advances in Atmospheric sciences 1990年第4期7卷 491-501页

作者： s.k.sinha D.R.Talwalkar s.G.Narkhedkar P.L.kulkarni s.Nair s.Rajamani Indian Institute of Tropical Meteorology Pune-411008 India Indian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 IndiaIndian Institute of Tropical Meteorology Pune-411008 India

In the present study objective analyses of relative humidity (RH) at surface and at the levels of 850, 700 and 500 hPa have been made using Gandin's (1963) optimum interpolation scheme. As the horizontal resolution of the radiosonde stations is rather inadequate for upper air humidity analysis, a scheme has been developed, following Rasmussen (1982) to estimate the upper air RH from the surface observations like surface RH, present weather and cloud cover. The relative humidities at the levels 850, 700 and 500 hPa were related to the surface observations through three separate regression relations. The RH values at 850, 700 and 500 hPa levels were estimated from the surface RH, cloud coverage and present weather using the above regression relations and subsequently the objective analyses at 00 GMT for the period from 4 July to 8 July 1979, were made using these estimated data along with the observed radiosonde data. Objective analyses were also made for the same period using only the radiosonde data for comparison to study the impact of those estimated data. Root mean square errors were computed for all the five days by interpolating RH at the observing stations from the objectively analysed field and comparing them with the actually observed RH to examine how best the analyses (with and without estimated data) fitted the observations. Lastly they were compared with satellite cloud pictures. This study shows that the estimated upper air RH values have positive impact on the analysis of upper air RH and could be used over radiosonde data sparse region and even over oceanic regions.

关键词： In RH over

Multivariate Objective Analysis of Wind and Height Fields in the Tropics

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Advances in Atmospheric sciences 1995年第2期12卷 233-244页

作者： s.k.sinha,s.G.Narkhedkar and s. Rajamani(Indian institute of Tropical Meteorology,Dr.Homi Bhabha Marg,Pashan,PUne-411008,India) Indian Institute of Tropical Meteorology Pashan India

The commollly used objective analysis scheme(scheme-A) for the analysis Of wind and geopotential height smoothen the divergent component of the wind which is rather important in the tropics,specifically over convective *** overcome this deficiellcy, a new analysis sCheme in which divergent component is included in the statistical model of the wind forecast errors,has been proposed by Daley(1985).Following this scheme,a new set of correlahon functions of forecast errors for the indian region during monsoon season which are suitable for analysing the tropical wind are *** analysis scheme(scheme--B) as well as scheme-A were used to make analyses for the period from 4 July to & July 1979(12 GMT) at 850,700 and 200 hpa levels over an area bounded by l.875'N to 39.375'N and 41.250'E to 108.750'E and subsequently divergent component,velocity potential are computed for both *** from both these schemes show that in the monsoon depression region the velocity potential and divergence have increased in the later case(scheme-B).This suggests that the divergent component has been enhanced in scheme-B and that the objechve of this study is realized to some extent.

关键词： Multivariate optimum interpolation scheme Divergent part of the wind Tropics Objective analysis

surface Crystals of Liquid Alkanes

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Surface Crystals of Liquid Alkanes

电子计算机辅助设计在柴油机设计中的应用——Rk系列发动机的发展

1996年中国青年学者物理学讨论会

作者： B.M.Ocko E.B.sirota s.k.sinha M.Deutsch Physics Dept. Brookhaven National Laboratory UptonNY 11973USA Exxon Research and Engineering Co. Route 22 East AnnandaleNJ 08801USA Advanced Photon source Argonne National Laboratory ArgonneIL 60439USA Physics Dept. Bar Ilan University Ramat Can 52900Israel

＜正＞Introduction Normal-alkanes are linear hydrocarbon chains,some of the simplest organic *** are also the main building blocks of lipids,surfactants,liquid crystals,polymers and many others, more complex organic *...

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国外内燃机车 1981年第4期 14-23页

作者： s.k.sinha 董尧青

拉斯顿(Ruston)柴油机公司生产三种系列发动机,AP系列发动机功率范围为500～1400马力,RΚ系列发动机功率范围为1410～4200马力,AT系列发动机功率范围为1650～4950马力。其中AT系列发动机转速可到600转/分,而AP和RΚ系列发动机转速范围为... 详细信息

拉斯顿(Ruston)柴油机公司生产三种系列发动机,AP系列发动机功率范围为500～1400马力,RΚ系列发动机功率范围为1410～4200马力,AT系列发动机功率范围为1650～4950马力。其中AT系列发动机转速可到600转/分,而AP和RΚ系列发动机转速范围为600～1000转/分。本文论述RΚ系列发动机的设计宗旨及其发展。RΚ系列发动机的缸径为264毫米,行程为305毫米,6缸机直列布置,8、12和16缸机V形布置。有关该机的主要参数在许多论文中有所报道~[1、2、3],已为众知。RΚ系列发动机的特点是具有一个铸铁的曲轴箱和底座配以锻钢曲轴。燃烧室零件中具有一个铸铁缸盖和一个铸铁缸套,钢制进排气门,整体式铝活塞。RΚ系列发动机经历了30年来在发电、铁路牵引和船舶动力等许多应用场合中的运用考核,其耐久性和可靠性已得到充分证实。

关键词：曲轴箱铸铁悬挂式工业铁发动机零件设计 Rk 压燃发动机柴油机

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水稻白叶枯病抗性的遗传

国外作物育种 2004年第4期23卷 7-8页

作者： s.k.sinha 向平

在60多种为害水稻的病害中，由Xanthomonas oryze ***引起的白叶枯病是整个水稻生长阶段危害性最大的病害之一。该病害随着在改良农艺措施下栽种的高产品种的推广而迅速蔓延。由于未能获得该病害有效的化学防治。

关键词：水稻白叶枯病抗性遗传性状生长发育

具大尺度比区域上表面剪力和浮力驱动流的二维非定常模型

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河海大学科技情报 1989年第1期9卷 109-117页

作者： s.k.sinha s.sengupta 俞国青

本文提出了具大尺度比(长度:深度)区域上流动的二维数值模型,该模型在静压分布假设,鲍辛涅斯克(Boussinesq)假设和刚盖假设基础上求解二维纳维-斯托克斯(Navier-stokes)方程和能量方程,同时利用可变的涡动系数考虑素流动量及热扩散。流... 详细信息

本文提出了具大尺度比(长度:深度)区域上流动的二维数值模型,该模型在静压分布假设,鲍辛涅斯克(Boussinesq)假设和刚盖假设基础上求解二维纳维-斯托克斯(Navier-stokes)方程和能量方程,同时利用可变的涡动系数考虑素流动量及热扩散。流动由表面风剪应力及热输运所引起。文中对矩形域计算了二种情况,计算条件是当表面和底部分别保持为常温时,表面上突然施加一个剪应力,二种计算情况的差别仅仅在于预测涡动粘性和涡动扩散系数时所用的公式不同。文中给出了流速和温度随时间的变化。计算表明,在达到恒定态之前而在一个初始缓慢变化的时期以后,流速和温度均有突然迅速的变化。文中根据对流和扩散的时间尺度的差异及控制方程彼此间的耦合性质解释了这一现象。

关键词：表面剪力浮力驱动流宽浅区域