检索结果-南通市图书馆

Acta Geologica Sinica(English Edition) 2001年第4期75卷 364-374页

作者： BIAN Qiantao, GAO Shanlin, li Dihui, YE Zhengren, chang Chengfa, LUO Xiaoquan institute of Geology and Geophysics, chinese academy of sciences, Beijing 100029 Science Press, chinese academy of sciences, Beijing 100717 institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 Science Press Chinese Academy of Sciences Beijing 100717 [?]3Bian Qiantao Born in 1945 graduated from the Department of Geology South-Central University of Technology in 1970 and obtained his master's degree and doctor's degree at the Graduate School and the Institute of Geology Chinese Academy of Sciences in 1981 and 1987 respectively. He is currently a professor of the Institute of Geology and Geophysics Chinese Academy of Sciences and has long been engaged in the research of tectonics petrology mineral deposits and geochemistry. Tel: (010) 62008058 E-mail: bianqt@***

The Late Neoproterozoic-Early Palaeozoic suture zones within the Central Orogenic Belt of China can be considered a system—the Kunlun-Qilian-Qinling suture system (KQQ suture system). It is basically divided into the western, central and eastern sectors. The western sector consists of the Küda-Subashi suture zone, the Mazar-Kangxiwar suture and the central west Kunlun microblock. The central sector covers the following five suture zones: the Altun, North Qilian, Qaidam northern marginal, Qimantag-wutuo and East Kunlun southern marginal sutures, in addition to some microblocks such as the mid-south Qilian, Qaidam, Ayakkum and Maqen microblocks. The eastern sector is composed of the Shangdan suture zone, Mianlüe suture zone and central Qinling-Dabie microblock. The KQQ suture system experienced (1) extending-rifting of the Rodinia super-continent in the early-middle Sinian (～780–600 Ma); (2) the formation and evolution of the KQQ archipelagic ocean during the Late Sinian-Ordovician (～600–440 Ma), and (3) closing of the KQQ ocean and forming of the KQQ suture system during the Late Ordovician—early Silurian (～440–400 Ma). As a system comprising many suture zones and microblocks, the KQQ suture system constitutes the foundation of the Central Orogenic Belt of China.

关键词： A Study of the Kunlun-Qilian-Qinling Suture System

POLYMERIZATION OF ETHYLENE wITH UNSYMMETRIC 2,6-BIS(IMINO)PYRIDINE IRON(Ⅱ)COMPLEX

在线全文

学校读者我要写书评

暂无评论

chinese journal of Polymer Science 2002年第3期20卷 205-211页

作者： Zhi Ma wen-hua Sun Zi-long li chang-xing Shao You-liang Hu State Key Laboratory of Engineering Plastics and the Center for Molecular sciences institute of Chemistry chinese academy of sciences, Beijing 100080 China State Key Lab. of Engineering Plast. Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

An unsymmetric 2,6-bis(imino)pyridine iron(II) complex 1' was synthesized. The relationship between catalyststructure and its activity in ethylene polymerization is discussed. The kinetic behavior of ethylene polymerization and theeffects of polymerization conditions such as temperature, aluminum/iron molar ratio on the activity of catalyst and thecharacteristics of polyethylene were reported. The unsymmetric catalyst 1' has a good catalytic performance of 3.47×10~6 gPE·mol^(-1)·Fe·h^(-1) at 40℃ with aluminum/iron molar ratio = 2500. A dependence of catalyst activity on themethylaluminoxane (MAO) concentration and reaction temperature was found. The molecular weight (Mw) of polyethylenewith broad dispersity is about 10~4-10~5 g/mol. The melting temperature and branching of polyethylenes vary with changingreaction temperature and aluminum/iron molar ratio.

关键词： Unsymmetric 2,6-bis(imino)pyridine iron(Ⅱ) complex Ethylene polymerization Catalyst structure Catalytic activity

CO-DEPOSITION OF li(Ⅰ)wITH RE(Ⅲ)AND ITS APPliCATION IN THE PRODUCTION OF Al-li-Cu-RE ALLOY BY MOLTEN SALT ELECTROLYSIS

在线全文

学校读者我要写书评

暂无评论

chinese Chemical Letters 1991年第2期2卷 163-166页

作者： kai Guo chang Min Shou ZHAO changchun institute of Applied Chemistry,chinese academy of sciences,changchun 130022

The possibility of co-deposition of li(Ⅰ)and RE(Ⅲ)has been estimated by both theoretical analysis and experimental study on the influences of temperature and concen- tration of chloride on the deposition *** the electrochemical and electrolytic results clearly show that li(Ⅰ)and RE(Ⅲ)can co-deposit on the Al-Cu electrode under selected conditions.

关键词： li AND ITS APPliCATION IN THE PRODUCTION OF Al-li-Cu-RE ALLOY BY MOLTEN SALT ELECTROLYSIS wITH RE Al Cu ITS

Crystal and Molecular Structure of Quinide

在线全文

学校读者我要写书评

暂无评论

chinese journal of Structural Chemistry 1996年第5期15卷 400-403页

作者： wANG Gang-li ZHAO Shu-jie CHEN De-chang(National institute for the Control of Pharmaceutical and Biological Product, Beijing, 100050)LU yang wU Nan ZHENG Qi-Tai(institute of Material Medical,the chinese academy of Medical sciences, Beijing, 100050) Natl. Inst. Contr. Pharmaceut./B.P. Beijing 100050 institute of Material Medical Chinese Academy of Medical Sciences Beijing 100050

A pure title compound was isolated from water soluble extraction of the fruits of Gardenia sootepensis Hutch.,and its crystal structure was determined by X-ray diffraction. The crystal, chemical formula C_7H_(10)O_5 and Mr 174. 15, is colorless,transparent and belongs to monoclinic system, space group P2_1. The crystal data are as follows:a=6.467(4), b=18.349(4), c=7. 041(4), β= 116. 21 (5)°,V=749.7(6), Z=4,Dx=1.543 g/cm￣3,F(000)=368,μ=0.08 mm-1,λ(MoKα) =0. 7106,R=0.063. It is weak hydrobonds that result in slight conformation difference between the intermolecular H-bond associated molecules.

关键词： gardenia sootepensis quinide crystal structure

Molecular and Crystal Structure of 1-(2-chloro)-Benzoyl-3-(4-methylphenyl) Thiourea

在线全文

学校读者我要写书评

暂无评论

chinese journal of Structural Chemistry 2000年第2期19卷 99-102页

作者： li Shu jin * ZHANG De Chun CAO Yan GE li Qin (Department of Chemistry, Suzhou University, Suzhou, 215006) YU kai Bei (Chengdu institute of Organic Chemistry, the chinese academy of sciences, Chengdu 610041) 苏州大学江苏苏州 2 1 50 0 6 中科院成都有机化学所四川成都 6 1 0 0 41

The title compound (C 15 H 13 ClN 2OS, M r =304.9) crystallizes in the triclinic system space group P1, a=7.984(2), b=9.712(1), c=11.140(1),α=97.58(1),β=110.55(1), γ=106.14(1)°, V=751.2(2) 3 , Z=2, D c =1.347g/cm 3, μ (Mo Kα )=0.389cm -1 , F (000)=316. The final R and wR are 0.0349 and 0 0894 for 2008 observed reflections (I≥2σ(I )), respectively. In the molecule of the title compound , there is an intramolecular hydrogen bond between the amide N and benzyl O atoms , forming a six membered ring in the central part of molecule. In the crystal, molecules are connected into infinite zigzag chains by N-H…S (- x, -y+1, -z ) and weak interaction N-H…O ( -x+1,-y+1,-z+1 ) along the direction 〔101〕(a+c). The weak intermolecular interaction Cl…Cl (- x, -y, -z ) links the chains into a layer. Between the resulting layers there are mainly van der waals interactions.

关键词： benzoylphenyl thiourea molecular structure crystal structure

Low genetic diversity and high genetic differentiation in the critically endangered Omphalogramma souliei (Primulaceae):implications for its conservation

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 Systematics and Evolution 2009年第2期47卷 103-109页

作者： Yuan HUANG chang-Qin ZHANG De-Zhu li(Key Laboratory of Biodiversity and Biogeography,Kunming institute of Botany,chinese academy of sciences,Kunming 650204,China) ( Key Laboratory of Biodiversity and Biogeography Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China )

Omphalogramma souliei *** an endangered perennial herb only distributed in alpine areas of Sw *** markers were applied to determine the genetic variation and genetic structure of 60 individuals of three populations of *** in Nw Yunnan,*** genetic diversity at the species level is low with P= 42.5%(percentage of polymorphic bands) and Hsp=0.1762(total genetic diversity).However,a high level of genetic differentiation among populations was detected based on different measures(Nei’s genetic diversity analysis:Gst=0.6038;AMOVA analysis:Fst=0.6797).Low level of genetic diversity within populations and significant genetic differentiation among populations might be due to the mixed mating system in which xenog-amy predominated and autogamy played an assistant role in *** genetic drift due to small population size and limited current gene flow also resulted in significant genetic *** assessment of genetic variation and differentiation of the endangered species provides important information for conservation on a genetic *** strategies for this rare endemic species are proposed.

关键词： genetic differentiation genetic diversity ISSR markers mating system Omphalogramma souliei

铀对α-Al_(2)O_(3)中氢与本征点缺陷相互作用的影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第5期42卷 123-129页

作者：杨飞龙向鑫胡立张桂凯陈长安中国工程物理研究院材料研究所江油621908

在长期高温服役过程中,铀床的氚渗透泄露问题是聚变堆涉氚系统中需要关注的焦点之一,而一种行之有效的解决思路是在内壁制备阻氚涂层.然而,服役过程中通过热扩散渗入涂层内部的铀可能在阻氚涂层氢行为中起作用,进而影响其服役可靠性.基... 详细信息

在长期高温服役过程中,铀床的氚渗透泄露问题是聚变堆涉氚系统中需要关注的焦点之一,而一种行之有效的解决思路是在内壁制备阻氚涂层.然而,服役过程中通过热扩散渗入涂层内部的铀可能在阻氚涂层氢行为中起作用,进而影响其服役可靠性.基于此,采用第一性原理计算方法,研究了铀对α-Al_(2)O_(3)中氢与本征点缺陷相互作用的影响.结果发现,铀对α-Al_(2)O_(3)中空位型本征点缺陷及氢相关缺陷的存在形式、电荷态及相对稳定性有重要影响.从形成能观点来看,铀对α-Al_(2)O_(3)中空位型本征点缺陷及氢相关缺陷的形成有利,且α-Al_(2)O_(3)中空位型点缺陷对氢的捕陷能力因铀的引入显著增加.研究结果对α-Al_(2)O_(3)基内壁阻氚涂层在氚工艺系统铀床中应用的可靠性评估具有重要的指导意义.

关键词：铀本征点缺陷氢相关缺陷相互作用 α-Al_(2)O_(3)

维普期刊数据库博看期刊

Growth and Characteristics of Nd^(3+):GdAl_3(BO_3)_4 Crystal

在线全文

学校读者我要写书评

暂无评论

chinese journal of Structural Chemistry 2003年第2期22卷 169-173页

作者： TU Chao-yang② ZHU Zhao-jie li jian-Fu wU Bai-chang (Fujian institute of Research on the Structure of Matter, The chinese academy of sciences, Fuzhou, Fujian 350002, China) BRENIER Alain (Laboratoire de Physico-Chimie des Mat閞iaux Luminescents, Universit?Claude Bernard-Lyon1,UMR CNRS 5620, France) Fujian institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China

Nd3+:GdAl3(BO3)4 (NGAB) crystal with the size of 30 mm was grown from the solvent system of K2O-Gd2O3-MoO3-B2O3 by combining accelerated seed rotation technology with medium seeded solution growth (MSSG) method, and its crystal structure has been determined by X-ray powder diffraction. It crystallizes in the trigonal system, space group R32 with a = 9.2734(2), c = 7.2438(1) ? V = 538 ?, Z = 3 and Dc = 4.379 g/cm3. The absorption and emission spectra of NGAB in the function of s and polarizations at room temperature have been measured. UV generation tuneable in 378～382 nm, green (531 nm) generation and blue generation tuneable in 436～443 nm as well as red (669 nm) generation by self-frequency changing were obtained with the output of 105, 119.5, 445 and 19 mj/pulse, respectively, when the crystal was pumped by a dye laser.

关键词： flux crystal growth Nd3+:GdAl3(BO3)4 crystal self-frequency changing laser

Molecular and Crystal Structure of 3′, 4′-Dimethoxy-4-N-methylstilbazonium lodide Hydrate C_(16)H_(18)NO_2^+· I^-· H_2O

在线全文

学校读者我要写书评

暂无评论

chinese journal of Structural Chemistry 1998年第4期17卷 309-312页

作者： ZHANG De-Chun FEI Zheng-Hao YU kai-Bei ZHANG Tian-Zhu GE li-Qin(Department of Chemistry, Suzhou University, Suzhou, 215006)(Chengdu institute of Organic Chemistry,the chinese academy of sciences, Chengdu, 610041) Departtnent of Chemistry Suzhou University Suzhou 215006 China Chengdu Inst. of Organic Chemistry Chinese Academy of Sciences Chengdu 610041 China

The title compound, C16H20INo3, crystallizes in space group P1 (#2),triclinic, a=7. 970(1), b=9. 098(1), c= 12. 910(2) A, a=90. 00(1), β=81. 63(1), γ=65. 75(1)°, V=842. 6(2) A 3, Z=2, Dc= 1. 581 g/cm3,μ(MoKa) = 1. 909mm-1, F(000) =400. The final R and (F2)R are 0. 0269 and0. 0632 for 2903 observed reflections (I>2σ(I) ), respectively. In the title molecule, two configurations,A and B were found for the slightly twisted cations, which take the same occupancy inthe crystal equally. Cations are connected through anions 1- and crystallized water,and anti-parallelly packed through intermolecular weak hydrogen bonding, van derwaals interactions and strong π-π interaction.

关键词： molecular structure crystal structure SHG material iodide hydrate