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Asymptotic behavior of the divergence on loop spaces over a compact Riemannian manifold

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Chinese Science Bulletin 1998年第4期43卷 272-274页

作者： LI Xiangdong Probability Laboratory, Institute of Applied Mathematics, Chinese Academy of Sciences, beijing 100080, china Probability Laboratory Institute of Applied Mathematics Chinese Academy of Sciences Beijing China

The asymptotic behavior of the divergence on loop space is studied over a compact Riemannian manifold via quasi_sure analysis. A Sobolev estimate plays a crucial role.

关键词： divergence exponential integrability Sobolev estimate.

Linear relationship between the interdecadal and interannual variabilities of North china rainfall in rainy season

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Chinese Science Bulletin 2003年第10期48卷 1040-1044页

作者： LU Riyu Institute of Atmospheric Physics, Chinese Academy of Sciences, beijing 100080, china Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100080 China

Interdecadal and interannual timescales are dominant in the North china rainfall in rainy season (July and August). On the interdecadal timescale, the North china rainfall exhibited an abrupt decrease at the end of 1970s. In this study, we examined the effect of this abrupt rainfall decrease on the association between rainfall and circulation on the interannual timescale, and found that the interdecadal variation does not change the physical mechanism responsible for the interannual variation of North china rainfall. There is a linear relationship between the interdecadal and interannual variabilities of North china rainfall in rainy season.

关键词：线性关系中国北部降雨量大气环流

Construction of High-Efficiency and Low-Cost Clean Steel Production System in Shougang Jingtang

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Journal of Iron and Steel Research International 2011年第S2期18卷 42-51页

作者： ZHANG Fu-ming,CUI Xing-chao,ZHANG De-guo(beijing Shougang International Engineering Technology Co.,ltd.,beijing 100043,china) beijing Shougang Int Engn Technol Co ltd Beijing 100043 Peoples R China

This paper analyzes the technology for clean steel production in modern iron and steel plant,a philosophy with production efficiency,manufacturing cost and product performance in its *** also makes a review on functions of high-efficiency,low-cost and high-quality steel products manufactured by the new generation iron and steel plant,in combination with the study on design of steelmaking-continuous casting process of Shougang Jingtang iron and steel *** applying precise and dynamic design system to optimize and allocate systems and working procedures of hot metal pretreatment,converter smelting,secondary refining,continuous casting process,etc,a platform of high-efficiency,low-cost and high-quality clean steel production is built.

关键词： steelmaking continuous casting clean steel hot metal pretreatment secondary refining

Hyperbolic geometry with geometric algebra

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Chinese Science Bulletin 1997年第3期42卷 262-263页

作者： LI Hong boInstitute of Systems Science, Chinese Academy of Sciences, beijing 100080, china Institute of Systems Science Chinese Academy of Sciences Beijing China

WE use the geometric algebra in refs. [1, 2] to study hyperbolic geometry. The n-dimensional hyperbolic space Hn is taken to be the unit sphere of G1 (I-n,1) with antipodal points identified. We study typically H2: the dualities between generalized point and generalized line, between generalized triangle and imaginary triangle; convex generalized triangles; Lorentz transformations; generalized circles and double-cycles, etc. Below we list some of the results.

关键词： line Hyperbolic geometry with geometric algebra

Single－Mode　CW　532nm　Output　of　1．3W　by　Internal　Frequency　Doubling　with　Ti：MgO：LiNbO3

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Chinese Journal of Lasers 1994年第1期B3卷 17-20页

作者： LI Jian WU Ling-An(Institute of Physics,Academia Sinica,beijing 100080, china) Acad Sinica Beijing China

Ｓｉｎｇｌｅ－ＭｏｄｅＣＷ５３２ｎｍＯｕｔｐｕｔｏｆ１．３ＷｂｙＩｎｔｅｒｎａｌＦｒｅｑｕｅｎｃｙＤｏｕｂｌｉｎｇｗｉｔｈＴｉ：ＭｇＯ：ＬｉＮｂＯ３￥ＬＩＪｉａｎ；ＷＵＬｉｎｇ－Ａｎ(ＩｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉ... 详细信息

Ｓｉｎｇｌｅ－ＭｏｄｅＣＷ５３２ｎｍＯｕｔｐｕｔｏｆ１．３ＷｂｙＩｎｔｅｒｎａｌＦｒｅｑｕｅｎｃｙＤｏｕｂｌｉｎｇｗｉｔｈＴｉ：ＭｇＯ：ＬｉＮｂＯ３￥ＬＩＪｉａｎ；ＷＵＬｉｎｇ－Ａｎ(ＩｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉｃｓ，ＡｃａｄｅｍｉａＳｉｎｉｃ?..

关键词： Ti:MgO:LiNbO3 stabilized internal frequency doubling

SYNTHESIS OF POLY(ETHYLENE TEREPHTHALATE)-POLYCAPROLACTONE BLOCK COPOLYMER BY DIRECT COPOLYMERIZATION

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Chinese Journal of Polymer Science 1999年第3期17卷 231-235页

作者： Shen-guo Wang Kai Tang Institute of Chemistry, Chinese Academy of Sciences, beijing 100080, china 中科院化学所北京 100080 中科院化学所北京

Po ly(ethylene terephthalate)-polycaprolactone block copolymer (PCL-b-PET) is a polyester with improved biodegradability. In the present paper, a new direct copolymerization method of epsilon-caprolactone (epsilon-CL) and bishydroxyethylene terephthalate (BHET) in the presence of Ti(OBu)(4) was proposed for the synthesis of PCL-b-PET. The PCL-b-PET copolymer was characterized by IR, GPC and H-1-NMR techniques, and the effects of synthesis conditions, such as temperature, reaction time and concentration of catalyst on the copolymerization were discussed.

关键词： poly(ethylene terephthalate)-polycaprolactone block copolymer direct copolymerization biodegradable polymer

Quasi-Homeomorphisms and Measures of Finite Energy Integrals of Generalized Dirichlet Forms

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Acta Mathematica Sinica,English Series 2000年第2期16卷 325-336页

作者： Wei Sun Institute of Applied Mathematics,Chinese Academy of Sciences,beijing,100080,P.R.china Institute of Applied Mathematics Chinese Academy of Sciences Beijing 100080 P. R. China

We introduce the quasi-homeomorphisms of generalized Dirichlet forms and prove that any quasi-regular generalized Dirichlet form is quasi-homeomorphic to a semi-regular generalized Dirichlet form. Moreover. we apply this quasi-homeomorphism method to study the measures of finite energy integrals of generalized Dirichlet forms. We show that any 1-coexcessive function which is dominated by a function in is associated with a measure of finite energy integral. Consequently, we prove that a Borel set B is-exceptional if and only if μ(B)=0 for any measure μ of finite energy integral.

关键词： Generalized Dirichlet form Quasi-homeomorphism Measure of finite energy integral

Neurospora NADP-glutamate dehydrogenases and its expression in *** and trans-genie plants

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Chinese Science Bulletin 2001年第12期46卷 1029-1032页

作者： WANG Fang & TIAN BoInstitute of Microbiology, Chinese Academy of Sciences, beijing 100080, china Institute of Microbiology Chinese Academy of Sciences Beijing China

Genes of NADP-glutamate dehydrogenase (NADP-GDH) were cloned from Neurospora intermedia (Ni), N. crassa (Nc), and N. sitophila (Ns). The sequences showed a high degree of homology at the cDNA and protein level. The three GDH genes were cloned into pET30a and expressed in E. coli. The activity assay of purified GDH showed that the Ni-GDH had a higher activity and affinity to ammonia than Ns-GDH, and Nc-GDH. The Km value of Ni-GDH ranges from 0.3 to 0.45 nimol/L. Ni-gdh gene was transformed to Nicotiana bethamiana plants. The transformed plants grew much better in low nitrogen media than the only ROKII vector transformed control.

关键词： Neurospora GDH expression transgenic tobacco.

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泮塘五约微改造,广州,广东,中国

世界建筑 2024年第8期 58-63页

作者： Urban Elephant Architectural Design & Planning (Guangzhou) Co.,ltd. Guangzhou Urban Renewal Planning & Design Institute Co.,ltd. 象城建筑规划设计(广州)有限公司广州市城市更新规划设计研究院

广州荔湾泮塘五约更新计划始于2011年底,至今仍在持续。本项目展示了2016-2024年间针对建筑和环境空间的历次设计、改造,反映了广州历史街区改造中出现的城市遗产整体观念,以及更新设计方法、修缮技术的不断尝试和逐渐进步。泮塘五约更... 详细信息

广州荔湾泮塘五约更新计划始于2011年底,至今仍在持续。本项目展示了2016-2024年间针对建筑和环境空间的历次设计、改造,反映了广州历史街区改造中出现的城市遗产整体观念,以及更新设计方法、修缮技术的不断尝试和逐渐进步。泮塘五约更新计划是在城市历史景观视角下,通过对建成遗产与环境、历史与当代生活记忆的阅读、理解,建立景观、遗产与传统文化的整体关联,并通过公众参与式的设计与共同缔造,实现多主体共同愿景下的保护、活化与发展。

关键词：项目展示城市历史景观整体观念广州荔湾更新设计公众参与泮塘共同愿景