检索结果-南通市图书馆

Science china Earth sciences 2006年第6期49卷 597-603页

作者： XIE Yuling1, HOU Zengqian2, XU Jiuhua1, YUAN Zhongxin2, BAI Ge2 & LI Xiaoyu3 1. Civil and Environmental Engineering school, university of Science and Technology Beijing, Beijing 100083, china 2. Institute of Geology, Chinese Academy of Geological sciences, Beijing 100037, china 3. The 109th Geological Team, Sichuan Bureau of Mineral Exploration, Chengdu 610100, china Civil and Environmental Engineering school University of Science and Technology Beijing Beijing China Institute of Geology Chinese Academy of Geological Sciences Beijing China The 109th Geological Team Sichuan Bureau of Mineral Exploration Chengdu China

Mianning-Dechang Himalayan REE Metallogenetic Belt in Sichuan Province lies along the western margin of the Yangtze Craton. We have conducted detailed mineralogical studies on ore minerals collected from Maoniuping and Dalucao, the two largest deposits in the belt. With optical microscope, SEM/EDS, and EPMA, three rare intermetallic minerals, i.e., zinccopperite (Cu2Zn), Sn- bearing native copper, and Cu-bearing jupiter were found to occur in the main ore along with barite, fluorite, apatite, sulfide and bastnaesite. Since the conditions under which zinccopperite and Sn- bearing native copper formed are quite unique, finding of these minerals, for the first time in domestic REE deposits, has significant implications for the genesis of the ore deposits in which they occur. In comparison with Cu-Zn intermetallic minerals in other occurrences, we propose that the formation of this REE metallogenetic belt is associated with fast upwelling of the Himalayan magma from deep source.

关键词： Mianning-Dechang REE metallogenetic belt, Cu-bearing intermetallic minerals, EPMA, genesis significance, deep source magmatic activity.

在线全文

学校读者我要写书评

暂无评论

利用表面元素绘制图形的方法

吉林大学学报（理学版） 2004年第4期42卷 554-558页

作者：权勇李文辉庞云阶吉林大学计算机科学与技术学院长春130012

讨论计算机生成真实感图形的新方法.针对某些非解析曲面,研究了基于表面元素的造型方法和绘制方法.在全局光照模型下,采用光线跟踪技术,结合所提出的新方法绘制了几幅真实感图形,取得了良好的效果,有效解决了传统方法中存在的一些问题.

关键词：真实感图形光线跟踪绘制方法计算机生成全局光照制图模型有效解解析曲面表面

Effect of Lamellar Orientation on Crack Paths in PST Crystals of γ-TiAl BasedAlloys

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 1999年第4期13卷 272-276页

作者： Yonghao Lu Lijie Qiao Yanbin ining chang Chu(Material Science and Engineering school, university of Science and Technology’ Beijing, Beijing 100083, china) Material Science and Engineering school University of Science and Technology Beijing Beijing 100083 China

The effect of lamellar orientation on crack paths in PST crystals of y-TiAl based alloys was investigated by in-situ SEM technique. The results indicate that the crack paths in PST crystals of y-TiAl based alloys are strongly dependent on lamellar orientation ofPST crystals, and the differently oriented PST crystals show different nucleation and propagation mechanisms of crack, resulting in different levels of fracture toughness.

关键词： γ-TiAl based alloy PST crystal lamellar orientation crack path

Synthesis of the Novel Fluoride-containing Organic Silane

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials Science) 2009年第4期24卷 644-646页

作者：汪水平 school of Materials Science and Technology Wuhan University of Technology

A fluoride-containing organic silane was synthesized by the reaction of N-ethyl- N-hydroxy-etbyl perfluorinated octyl sulfonamide （EHPOS）, N-（β-aminoethyl）-γ-aminopropyl trimethoxy silane （ATS） and cis-butenedioic anhydride （CA）. The experimental results show that the yield of product is up to 87% when the molar ratio ofEHPOS ： CA ： ATS is 1 ： 1.05 ： 1.1. EHPOS and CA were maintained at 115 ℃ for 3 hours, then after cooling the reaction solution to 75 ℃, ATS was added and reacted for another 3.5 hours at 145 ℃. The structure of the product and thermal properties were characterized by Fourier transform infrared （FTIR） and thermogravimetric analysis （TGA）, respectively. Results show that fluoride-containing organic silane has excellent thermal stability below 185℃.

关键词： N-ethyl-N-hydroxyethyl perfluorinated octyl sulfonamide cis-butenedioic anhydride N-(β-arninoethyl)-γ-aminopropyl trimethoxy silane

Creation Conditions and Development Model for Lithologic and Stratigraphic Traps in the West Sag of the Beach Area,Liaohe Depression

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 139-139页

作者： Cong Zhang school of Earth sciences and Resources,china university of Geosciences(Beijing),Beijing 100083,china

At present the Eocene reservoir is the focus of exploration in the west sag of the beach area,Liaohe Depression,and lithologic and stratigraphic traps are the most important in the future *** regional geological background indicated that lithologic and stratigraphic traps might be created in the study area. Studies on creation conditions and distribution pattern of lithologic and stratigraphic traps are

关键词： Hthologic and stratigraphic traps slope-break zone sequence development model

Pharmacokinetics and tissue distribution of 5-fluorouracil encapsulated by galactosylceramide liposomes in mice

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2005年第2期26卷 250-256页

作者： Yong JIN,Jun LI~2,Long-fu RONG,Xiong-wen L(?),Yan HUANG,Shu-yun XUInstitute of Clinical Pharmacology,school of Pharmacy,Anhui Medical university,Hefei 230032,china Institute of Clinical Pharmacology School of Pharmacy Anhui Medical University Hefei China

Aim:To study the pharmacokinetics and tissue distribution of 5-fluorouracil en-capsulated by galactosylceramide liposomes(5-Fu-GCL)in ***:Theconcentration of 5-fluorouracil(5-Fu)in serum was detected by high performanceliquid chromatography after 5-Fu-GCL(80,40,20 mg/kg)and free 5-Fu(40mg/kg)were injected intravenously into *** tissue distribution of 5-Fu-GCL(40mg/kg)and free 5-Fu(40mg/kg)was investigated,and concentration-timeprofile of the two preparations in the liver were *** were analyzed by3p97 ***:Serum concentration-time curves of 5-Fu-GCL and free5-Fu conformed to one compartment model of first order absorption.5-Fu-GCLat 80,40,and 20 mg/kg had T1/2Keof 25.8±4.2,27.3±4.4,and 28.2±5.6 min;C0of24.9±4.9,17.7±3.6,and 11.5±2.7 mg/L;and AUC of 990.0±45.2,622.5±38.3,and 340.4±25.6 ***.L-1,*** contrast free 5-Fu at 40 kg/mg hadT1/2Keof 15.8±2.2min,C0of 35.8±6.2mg/L,AUC of 639.0±35.9 *** distribution of 5-Fu-GCL in the liver and immune organs was significantlyincreased,while in heart and kidney it was remarkably *** AUC of 5-Fu-GCL in the liver was 3 times higher than that of free ***:Thepharmacokinetics and tissue distribution of 5-Fu-GCL appears to be linear-re-lated and dose-dependent,and exhibits sustained-release and hepatic targetcharacteristics.

关键词： 5-fluorouracil galactosylceramide liposomes pharmacokinetics

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

用启发式策略检测口令安全

吉林大学学报（理学版） 2004年第4期42卷 529-533页

作者：杨可新鞠九滨胡亮吉林大学计算机科学与技术学院长春130012

针对现有口令安全措施中存在的问题进行了分析,提出一种利用启发式策略检测口令安全的方法,该方法模拟社交工程破解口令的逻辑推理过程,利用启发式策略指导口令核的检测过程,从而有针对性的选择口令核字典,缩小搜索空间,再利用计算机的... 详细信息

针对现有口令安全措施中存在的问题进行了分析,提出一种利用启发式策略检测口令安全的方法,该方法模拟社交工程破解口令的逻辑推理过程,利用启发式策略指导口令核的检测过程,从而有针对性的选择口令核字典,缩小搜索空间,再利用计算机的强计算能力完成变形重组工作,提高效率.以攻击者的思维、角度来考虑安全问题,假定攻击者在了解用户有关信息的情况下,模拟攻击者破解口令的智能推导过程来检验口令的安全性.同时,还描述了利用此方法实现的一个原型系统,实验表明,它可以改进口令检测的效果和效率.

关键词：口令安全攻击者破解启发式原型系统计算机搜索空间策略进口缩小

Isolation and Characteristics of a Microbial Consortium for Effectively Degrading Phenanthrene

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2007年第3期4卷 68-75页

作者： Wang Jing Xu Hongke Guo Shaohui school of Chemical Science ＆ Engineering China University of Petroleum Beijing 102249 China

A microbial consortium （named W4） capable of aerobic biodegradation of solid phenanthrene as the sole source of carbon and energy was isolated by selective enrichment from petroleum-contaminated soil in the Henan oilfield, china. The strains of the consortium were identified as Sphingomonas cloacae, Rhizobium sp., Pseudomonas aeruginosa and Achromobacter xylosoxidans respectively by means of genetic methods. The major metabolites of phenanthrene were analyzed by gas chromatography-mass spectrometry （GC-MS）. The biodegradation percentage of solid phenanthrene at 200 mg/L in liquid medium after 7 days of growth was greater than 99%. The degradation of phenanthrene was compared between individual predominant strains and the microbial consortium in different treatment processes. The microbial consortium showed a significant improvement of phenanthrene degradation rates in either static or shaking culture. The degradation percentage of phenanthrene by the consortium W4 decreased to some degree when C 16 coexisted, however it was hardly affected by C30. Furthermore, the ability of consortium W4 to remediate oil sludge from the Dagang oil refinery was studied by composting, and it was found that the consortium W4 could obviously remove polycyclic aromatic hydrocarbons （PAils） and paraffinic hydrocarbons. All the results indicated that the microbial consortium W4 had a promising application in bioremediation of oil-contaminated environments and could be potentially used in microbial enhanced oil recovery （MEOR）.

关键词： Phenanthrene consortium biodegradation bioremediation

Study of chemical forms of phosphorus and their bioavailability in the sediments

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2004年第2期23卷 317-327页

作者： ZHENGAirong SHENHaiwei LIWenquan DepartmentofOceanography／InstituteofSubtropicalOceanography XiamenUniversityXiamen361005China GraduateschoolofOceanography UniversityofRhodeIslandNarragansett02882USA

Chemical forms of phosphorus in the sediments of the Daya Bay, the Zhujiang River estuary , and the Xiamen Bay are measured with extraction solutions of MgCl2, NaOH, and HC1. Their availabilities to Chlorella sp. and Isochrysis galbana are estimated by using sediments as the sole source of P in the bioassays. The results show that the contents of total phosphorus (TP) in these sediments are 449.3, 650.1 and 643.9 mg/kg, respectively. The contents of non-apatite inorganic P (NAIP) extracted with MgCl2 and NaOH from 3 sediments are 168.8, 146.6 and 118.1 mg/kg, respectively, and account for 18.3% -32.6% of TP. The phosphorus extracted with HC1 solution is greater than that extracted with NaOH solution and the lowest extracted P is MgCl2-extractable P. The greatest relative growth rates of Chlorella sp. and Isochrysis galbana cultured with sediments are in the range of 4.3% -26.9%. The increasing biomasses of these algae correspond to NAIP and AAPP (the estimated algal-available particulate P). AAPP accounts for 42.4% -78.2% of NAIP, 21.1 % - 27.1% of total inorganic P, and 11.8% - 20.3% of TP, respectively.

关键词： chemical forms phosphorus bioavailability,sediment

Existence and Uniqueness of Solutions to a Class of Quantum Hydrodynamic Model for Semiconductors

在线全文

学校读者我要写书评

暂无评论

Existence and Uniqueness of Solutions to a Class of Quantum ...