检索结果-南通市图书馆

METALLOGENIC CHARACTERISTICS AND OREPROSPECTINGFUTURE OF PRECAMBRIAN GOLD DEPOSITSIN MUFUJIULING DISTRICT

在线全文

学校读者我要写书评

暂无评论

Journal of central south univ.rsity 1996年第1期8卷 11-13页

作者： Wu Yanzhi(Department of Geology, central south univ.rsity of Technology,Changsha 410083, China) Department of Geology Central South University of Technology Changsha 410083 China

MufuJiuling district is an important placer gold producing land since the ancient time. In recent years, some primary gold deposits and mineralizations, e. g., Huangjindong and Tulongshan gold deposits, have been found. But the metallogenic conditions and regularities as well as the oreprospecting future remain to be recognized. Through the study on the metallogenic background and condition, the auriferous source bed and the mineralizing characteristics, three types of primary gold deposits are confirmed to be prospective in this district and some key problems about their prospecting and evaluating are put forward.

关键词： primary gold deposit PreCambrian age metallogenic marker

Predictor-corrector interior-point algorithm for linearly constrained convex programming

在线全文

学校读者我要写书评

暂无评论

Journal of central south univ.rsity 2001年第3期13卷 208-212页

作者： LIANG Xi-ming (College of Information Science & Engineering, central south univ.rsity, Changsh a 410083, China) 1. College of Information Science & Engineering Central South University 410083 Changsha China

Active set method and gradient projection method are curre nt ly the main approaches for linearly constrained convex programming. Interior-po int method is one of the most effective choices for linear programming. In the p aper a predictor-corrector interior-point algorithm for linearly constrained c onvex programming under the predictor-corrector motivation was proposed. In eac h iteration, the algorithm first performs a predictor-step to reduce the dualit y gap and then a corrector-step to keep the points close to the central traject ory. Computations in the algorithm only require that the initial iterate be nonn egative while feasibility or strict feasibility is not required. It is proved th at the algorithm is equivalent to a level-1 perturbed composite Newton method. Numerical experiments on twenty-six standard test problems are made. The result s show that the proposed algorithm is stable and robust.

关键词： linearly constrained convex programming predictor corrector interior point algorithm numerical experiment

DRILLING OF EXTRA-HARD FORMATIONS

在线全文

学校读者我要写书评

暂无评论

Journal of central south univ.rsity 1996年第1期8卷 33-35页

作者： Lu Fan(Department of Geology, central south univ.rsity ofTechnology, Changsha 410083, China) Department of Geology Central South University of Technology Changsha 410083 China

The reason for bit slipping in extrahard formations has been analysed, and a new type of antislipping bit for extrahard formations have been recommended.

关键词： bit slipping extrahard formation diamond〖J

Mathematical model of oxygen outdiffusion

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1994年第3期4卷 71-76页

作者： Liu Rong Cheng, Qiuping Li Yidong She Siming(central south univ.rsity of Techology Chngsha 410083) central south univ.of Technology Changsha China

ＭＡＴＨＥＭＡＴＩＣＡＬＭＯＤＥＬＯＦＯＸＹＧＥＮＯＵＴＤＩＦＦＵＳＩＯＮＯＮＬｉｕＲｏｎｇ；Ｃｈｅｎｇ，ＱｉｕｐｉｎｇＬｉ；ＹｉｄｏｎｇＳｈｅＳｉｍｉｎｇ（ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｏ... 详细信息

ＭＡＴＨＥＭＡＴＩＣＡＬＭＯＤＥＬＯＦＯＸＹＧＥＮＯＵＴＤＩＦＦＵＳＩＯＮＯＮＬｉｕＲｏｎｇ；Ｃｈｅｎｇ，ＱｉｕｐｉｎｇＬｉ；ＹｉｄｏｎｇＳｈｅＳｉｍｉｎｇ（ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｏｌｏｇｙＣｈｎｇｓｈａ４１００８３...

关键词： CZSi outdiffusion intrinsic gettering

Synthesis and purification of trialkyl compounds of gallium and indium

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2002年第1期21卷 1-6页

作者： SHU Wangen, ZHOU Zhongcheng and LI Xiong Chemistry and Chemical Engineering College, central south univ.rsity, Changsha 410083, China Chemistry and Chemistry Engineering College Central South University Changsha 410083 Chemistry and Chemical Engineering College Central South University Changsha 410083

The The research progress in trialkyl compounds of gallium andindium was discussed from two aspect, one was the chemical synthesisof the compounds and the other was the purification of them. Thereare three synthesis routes be- ing reported in the first aspect, *** route staring form pure metal, the route starting from the puremetal trihalides, and the electrochemical route. In the secondaspect, the purifying methods of decomposition-distillation and zonerefining were reviewed.

关键词： trialkyl compounds gallium nd indium synthesis purification

SYNTHESIS OF TiAl+TiB_2 COMPOSITE AND-ITS THERMAL STABILITY

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1993年第12期6卷 427-431页

作者： QU Xuanhui HUANC Baiyun LEI Changming CHEN Shiqi central south univ.rsity of Technology,Changsha,China professor,Powder Metallurgy Research Institute,central south univ.rsity of Technology,Changsha 410083,China central south univ.of Technology Changsha China

Synthesis process of a TiAl+TiB_2 composite from the elemental powders was studied by means of differential scanning calorimetry and X-ray ***_2 particles may form in TiAl matrix at temperature even below 700℃ owing to the exothermic reactions between Ti and Al ***_2 particles are very thermally stable,and they almost did not change in their relative amount,morphology and size after the synthesized composite was *** addition,the existence of TiB_2 particles has obvious refining effect in the as-cast microstructure of TiAl-base alloys.

关键词： TiAl alloy TiB_2 composite thermal stability

Which Democracy? How to Go beyond It:Response to Wang Shaoguang

在线全文

学校读者我要写书评

暂无评论

学术界 2011年第2期 260-263页

作者： Dong shanmin School of Public Administration,central south univ.rsity

*** and beyond,written by Wang Shaoguang,absolutely,is an interesting and enlightening masterwork in recent *** was published by China Citic Press in *** of the topics he investigated is how to understand democracy and the relations between state-building and *** brings up two important conceptions of democracy issue in those ***,democracy,as a regime,is filled with much more fault from

关键词： Wang How to Go beyond It Which Democracy

ON　THE　CARBONIFEROUS－PERMIAN　BOUNDARY

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of central south univ.rsity 1996年第1期8卷 60-62页

作者： Zhang Zuqi(Department of Geology, central south univ.rsity of Technology, Changsha 410083, China) Dezpartment of Geology Central South University of Technology Changsha 410083 China

An objection has been lodged against the traditional P/C boundary which were still upholded by International Subcommission on Permian Stratigraphy, International Commission on Stratigraphy, IUGS. And the rationali... 详细信息

关键词： stratigraphy stratigraphic boundary Carbonifeous Permian allglobe.〖

LIQUID SEPARATION OF TUNGSTEN-TIN-BEARING GRANITIC MELT AT 85℃ AND 150 MPa

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1995年第4期5卷 8-13,17页

作者： Chen Zilong Peng Shenglin(Department of Geology,central south univ.rsity of Technology,Changsha 410083) CENT S univ.TECHNOL DEPT GEOLCHANGSHA 410083PEOPLES R CHINA

ＬＩＱＵＩＤＳＥＰＡＲＡＴＩＯＮＯＦＴＵＮＧＳＴＥＮ－ＴＩＮ－ＢＥＡＲＩＮＧＧＲＡＮＩＴＩＣＭＥＬＴＡＴ８５℃ＡＮＤ１５０ＭＰａＣｈｅｎＺｉｌｏｎｇ；ＰｅｎｇＳｈｅｎｇｌｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙ，... 详细信息

ＬＩＱＵＩＤＳＥＰＡＲＡＴＩＯＮＯＦＴＵＮＧＳＴＥＮ－ＴＩＮ－ＢＥＡＲＩＮＧＧＲＡＮＩＴＩＣＭＥＬＴＡＴ８５℃ＡＮＤ１５０ＭＰａＣｈｅｎＺｉｌｏｎｇ；ＰｅｎｇＳｈｅｎｇｌｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅ...

关键词： liquid separation W-Sn-bearing granitic melt experimental method