检索结果-南通市图书馆

Propulsion and Power Research 2016年第4期5卷 326-337页

作者： Shweta Mishra Dulal Pal Hiranmoy Mondal precious Sibanda School of Engineering and Technology Amity UniversityNew TownKolkataWest Bengal 700135India Department of Mathematics Institute of ScienceVisva-Bharati(A Central University)SantiniketanWest Bengal 731235India School af Mathematics Statistics and Computer ScienceUniversity of KwaZulu-NatalPrivate Bag X01ScottsviUePietermaritzburg 3209South Africa

In this paper magnetoconvective heat and mass transfer characteristics of a two-dimensional steady flow of a nanofluid over a non-linear stretching sheet in the presence of thermal radiation,Ohmic heating and viscous dissipation have been investigated *** model used for the nanofluid incorporates the effects of the Brownian motion and the presence of nanopanicles in the base *** governing equations are transformed into a system of nonlinear oidinary differential equations by using similarity *** numerical solutions are obtained by using fifth order Runge-Kutta-Fehlberg method with shooting *** non-dimensional parameters on velocity,temperature and concentration profiles and also on local Nusselt number and Sherwood number are *** results indicate that the local skin friction coefficient decreases as the value of the magnetic parameter increases whereas the Nusselt number and Sherwood number increase as the values of the Brownian motion parameter and magnetic parameter increase.

关键词： Nanofluid Magnetoconvection Thermal radiation Non-linear stretching sheet Ohmic heating

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

微量钐对银铜基合金再结晶的影响

稀土 1997年第6期18卷 52-55页

作者：陈藜莉张康侯徐云昆明贵金属研究所

研究了在银铜基合金中添加轻稀土元素钐对合金再结晶温度、再结晶激活能及再结晶速度的影响，并与添加重稀土元素钆的情况进行了比较。结果表明：在Ａｇ－Ｃｕ合金中添加０．２ｗｔ％Ｓｍ后，其再结晶温度比含铜量相同的Ａｇ－Ｃｕ和Ａ... 详细信息

研究了在银铜基合金中添加轻稀土元素钐对合金再结晶温度、再结晶激活能及再结晶速度的影响，并与添加重稀土元素钆的情况进行了比较。结果表明：在Ａｇ－Ｃｕ合金中添加０．２ｗｔ％Ｓｍ后，其再结晶温度比含铜量相同的Ａｇ－Ｃｕ和Ａｇ－Ｃｕ－０．２Ｇｄ合金均有大幅度提高；再结晶激活能高于相应的Ａｇ－Ｃｕ合金，但比Ａｇ－Ｃｕ－０．２Ｇｄ合金低；再结晶速度快于Ａｇ－Ｃｕ－０．２Ｇｄ合金且与Ａｇ－Ｃｕ合金相近。

关键词：钐银铜基合金再结晶

在线全文

学校读者我要写书评

暂无评论

认识经验训练发展理性训练

体育科学 2004年第9期24卷 41-47页

作者：邓运龙八一军体大队科研所北京100072

对“经验训练”的认识 ,不仅涉及到评价 ,更重要的是关系到运动训练的发展方向。从对“经验训练”与“科学训练”辨析入手 ,较系统地提出了对“经验训练”的 6点认识 :经验训练是运动训练发展进程中的基础阶段 ;经验成分始终伴随着运动... 详细信息

对“经验训练”的认识 ,不仅涉及到评价 ,更重要的是关系到运动训练的发展方向。从对“经验训练”与“科学训练”辨析入手 ,较系统地提出了对“经验训练”的 6点认识 :经验训练是运动训练发展进程中的基础阶段 ;经验成分始终伴随着运动训练发展的全部过程 ;经验行为包含有理性认识因素 ;经验材料是运动训练发展的宝贵资源 ;经验训练阶段必须发展到理性训练阶段 ;经验积累与理性训练阶段交替循环发展。并提出了发展理性训练的 3个重点环节 :发展专项运动训练理论 ;畅通理论指导运动训练实践的中介 ;形成科学的“训练观念”。

关键词：运动训练科学训练理论

Property and provenance study of fancy celadon samples excavated from the Noble Burials of the Yue State at Hongshan, china

在线全文

学校读者我要写书评

暂无评论

Science china.Technological Sciences) 2010年第2期53卷 369-374页

作者： WU Juan1, WU JunMing1 , LI QiJiang1, ZHANG MaoLin1, LI JiaZhi2, LU XiaoKe2 & DENG ZeQun2 1 Jingdezhen Ceramics institute, Jingdezhen 333001, china.2 Shanghai institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, china 1. Jingdezhen Ceramics institute Jingdezhen 333001 China2. Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

The Noble Burials of the Yue State at Hongshan in Wuxi City with many fancy burial objects were excavated by Archaeology institute of Jiangsu Province and Xishan District Committee for Administration of Cultural Relics of china. It was appraised as one of the ten major archaeological excavations in 2004. Some precious ceramic samples excavated from this site are very important for studying the development history of Chinese ceramics, especially for studying the origin of porcelain. With the cooperation of Archaeology institute of Nanjing Museum, the ceramic samples excavated from the Noble Burials of the Yue State at Hongshan were collected and systematically analyzed. Compared with the celadon samples produced in Yue-kiln site during later Eastern Han Dynasty (25–220 A.D.), some important topics such as the provenance and properties of the ceramic samples excavated from the Noble Burials of the Yue State at Hongshan were deeply studied.

关键词： Noble Burials of the Yue State at Hongshan multivariate statistical analysis method origin of porcelain celadon

在线全文

学校读者我要写书评

暂无评论

玻璃对Pt合金的接触角与其粘度的关系

金属学报 1981年第6期 695-698页

作者：宁远涛冶金工业部贵金属研究所

在实践中发现,一定温度范围内,熔融玻璃的粘度和对Pt合金的接触角,二者与温度的关系是相似的,促使我们对此进行研究。研究用的无碱和中碱玻璃的成分列于表1.玻璃粘度η与温度T的关系示如图1,

关键词：接触角润湿角碱玻璃 Pt 粘度粘滞度流动特性

混合热对Zr基金属玻璃体形成和稳定性的影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

金属学报 1984年第4期 352-357页

作者：冯本政朱应华杨汝森冶金工业部贵金属研究所

用熔融自旋技术制备了Zr1-xMx（M=Fe,Co,Ni,Cu和Pd）和Cu67.5Ti32.5合金玻璃体。用变换转鼓切线速度的方法,确定了上述合金形成玻璃态的临界切线速度为31m/s。所有合金玻璃体经X射线衍射分析证明为玻璃态结构。用示差扫描量热器,以不同... 详细信息

用熔融自旋技术制备了Zr1-xMx（M=Fe,Co,Ni,Cu和Pd）和Cu67.5Ti32.5合金玻璃体。用变换转鼓切线速度的方法,确定了上述合金形成玻璃态的临界切线速度为31m/s。所有合金玻璃体经X射线衍射分析证明为玻璃态结构。用示差扫描量热器,以不同的升温速率测量了它们的热行为。在Fe24Zr76,Ni24Zr76合金玻璃体中呈现出一个放热峰,而Co21Zr79,Pd24.5Zr75.5,Cu45Zr55和Cu67.5Ti32.5则有两个或三个放热峰。用Kissinger技术确定了各个合金玻璃的结晶激活能。最后讨论了由Miedema模型计算的二元合金的混合热对合金玻璃体形成和稳定性的影响。

关键词：玻璃体混合热热化学 Zr 基金属

Effects of ethanol extract of leaves of Helianthus annus on the fecundity of Wistar rats

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2010年第6期3卷 435-438页

作者： Ejebe Daniel Emamuzo Siminialayi Iyeopu Miniakiri Emudainohwo Joseph Oghenebrorie Tedwin Kagbo Hope Delesi Amadi precious Department of Pharmacology Delta State University AbrakaNigeria Department of Pharmacology University of Port HarcourtNigeria institute of Science Laboratory and Technology Delta State UniversityAbraka Nigeria

Objective:To evaluate the effects of ethanol extract of leaves of Helianthus annus(***) on the fecundity of Wistar ***:Forty(20 male and 20 female) Wistar rats,grouped into control,ethanol extract treated rats and untreated,were used for the *** rats had 0.5 g/kg of ethanol extract orally for 2 weeks;control rats had 5%alcoholic water(solvent);and untreated rats had their normal feed and clean drinking *** treatment,the animals were sub-grouped into 5 mating groups to observe the coital frequency,pregnancy rate and average number of pups per group in ***:The results showed that coital frequency was unaffected by the extract treatment but pregnancy rate and number of pups per rat and per group were reduced significantly in groupsⅡ,ⅢandⅣcompared to those of groupⅠandⅤrats which were not treated with the ethanol extract of leaves of ***:The histodegenerative in the gonads reportedly induced by this ethanol extract in previous studies may be responsible for the reduced fecundity observed in treated adult rats.

关键词： Ethanol extract Helianthus annus Leaves Fecundity Rats

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

YG001型电拉试验机拉力系统柔度分析

贵金属 1987年第4期 43-51页

作者：周学智胡冰昆明贵金属研究所

国家标准（GB2610—81）中没有测量微小拉力试验机系统柔度的规定。本文提出一种用光学读数显微镜装置测量YG001微电拉试验机系统柔度的方法。当样品不能附装应变仪的情况下,此法有助于研究细薄样品的力学性能和描绘真实负荷变形曲线,... 详细信息

国家标准（GB2610—81）中没有测量微小拉力试验机系统柔度的规定。本文提出一种用光学读数显微镜装置测量YG001微电拉试验机系统柔度的方法。当样品不能附装应变仪的情况下,此法有助于研究细薄样品的力学性能和描绘真实负荷变形曲线,特别适合用微机对试验机的实时控制。试验表明,试验机系统柔度比通用的万能材料试验机系统柔度大得多,其数量级为2.5×10-3至3.6×10-3mm/gf。最后对测量精度进行估算。

关键词：试验机试验设备柔度 YG001

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

熔体淬火形成非晶态的判据

金属学报 1981年第3期 278-284页

作者：宁远涛周新铭冶金工业部贵金属研究所

本文提出了合金熔体淬火形成非晶态的新判据:I/ΔS0.0044,其中I=1-Tm/（?）m,△S=1/100CB（（?）m-Tm）。Tm是合金的熔点,（?）m是组元加权平均熔点,CB是合金溶质B的at%。新判据考虑了合金成分和中间相的影响,提高了准确性。在全部所讨... 详细信息

本文提出了合金熔体淬火形成非晶态的新判据:I/ΔS0.0044,其中I=1-Tm/（?）m,△S=1/100CB（（?）m-Tm）。Tm是合金的熔点,（?）m是组元加权平均熔点,CB是合金溶质B的at%。新判据考虑了合金成分和中间相的影响,提高了准确性。在全部所讨论的127个合金中,只有一个明显例外。此外还讨论了形成非晶态合金的浓度分布和相图特征。

关键词：非晶态合金中间相相图合金熔体金属玻璃精密合金金相相组成平衡图判据溶质浓度合金成分

Origin and age of Mn deposits of the Nantuo Formation in the Sinian System

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第24期42卷 2072-2075页

作者： YANG Jiedong, WANG Zongzhe, XUE Yaosong, SUN Weiguo, TAO Xiancong and ZHOU Chuanming1. Center of Modern Analysis, Nanjing University, Nanjing 210093, china.2. Nanjing institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, china Center of Modern Analysis Nanjing University Nanjing China Nanjing institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing China

THE tillites in the Nantuo Formation of the Sinian System is considered contemporary with theVaranger ice age. The manganese deposits in the Nantuo Formation are most suitable to iso-topic dating and may record the precious information on paleo-ocean chemistry. However,there have heen different views and disputations about their origin and age for a long time. The Sinian System in the Yangtze region is divided into 3 formations from base to top:the Nantuo Formation, the Doushantuo Formation and the Dengying Formation. The

关键词： Neoproterozoie ice age Mn deposit isotopic age.