检索结果-南通市图书馆

research on Jiuquan-Jiayuguan-Yumen Region's Dynamic Changing of Urbanization Based on Self-Organizing Model

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 Journal of Population,Resources and Environment 2005年第3期3卷 22-28页

作者： Li Ming 1,2.& Fang Chuanglin 2.1 Graduate School of the Chinese Academy of Sciences, Beijing 100039,china 2.institute of Geographical Sciences and Natural Resources {2., CAS, Beijing 100101, china Graduate School of the Chinese Academy of Sciences Beijing 100039 China institute of Geographical Sciences and Natural Resources research CAS Beijing 100101 China

Based on the self-organizing modeling principle in the dissipative structure theory, the paper regards the migration coupling between the regions as the influence factor to create the model of regional urbanization simulation and prediction, which is more practical to simulate the space-time and dynamic evolvement characteristics of regional urbanization level. According to the historical data about the population and urbanization of Jiuquan, Jiayuguan andYumen cities, the past 50 years' dynamic evolvement trend is simulated and the following 50 years' dynamic evolvement trend is predicted with the urbanization dynamic evolvement model based on the self-organizing model. The analysis of effective factors such as economic increase, resources exploitation, ecosystem construction, traffic location, national policies, population migration are given, then the reasons of the dynamic evolvement differences of the three cities' urbanization are drawn. The study suggests that the self-organizing model is fit for the simulation of Jiuquan-Jiayuguan-Yumen regional urbanization level in the past 50 years, and the departure between the stimulant and the actual data is under 5%, so it can be used to predict the urbanization future of the three cities. The predicted results show that the regional population will reach 1.074 million and the regional urbanization level will be 72.56%.

关键词： self-organizing urbanization dynamic evolvement Jiuquan-Jiayuguan-Yumen region

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中建滨湖设计总部,成都,四川,中国

世界建筑 2024年第4期 16-19页

作者： china Southwest Architectural Design and research {2. Corp. Ltd. 中国建筑西南设计研究院有限公司

作为西南地区首个近零能耗建筑项目,中建滨湖设计总部从地域气候适应性的节能研究出发,考虑冬夏不同工况,突破体型系数的限制,提出了夏热冬冷地区超低能耗建筑设计的理论及方法。项目综合运用被动式策略、主动式技术与可再生能源,结合... 详细信息

作为西南地区首个近零能耗建筑项目,中建滨湖设计总部从地域气候适应性的节能研究出发,考虑冬夏不同工况,突破体型系数的限制,提出了夏热冬冷地区超低能耗建筑设计的理论及方法。项目综合运用被动式策略、主动式技术与可再生能源,结合工业化技术与新材料研发,最终实现形式空间、建筑技术与能耗性能的良好匹配。

关键词：可再生能源工业化技术体型系数气候适应性新材料研发西南地区

The research of Controlling Inclusions in Middle and High Carbon Steel During TSCR

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel research International 2011年第S2期18卷 365-370页

作者： LI Lie-jun1, GAO Ji-xiang1,2.(1. School of Mechanical and Automotive Engineering, South china University of Technology, Guangzhou 510640, Guangdong, china 2. CSP applying technology {2., GISE, Guangzhou 510730, Guangdong,china) S china Univ Technol Sch Mech & Automot Engn Guangzhou 510640 Guangdong Peoples R China GISE CSP Applying Technol Inst Guangzhou 510730 Guangdong Peoples R China

Based on the characteristics of Thin slab casting and rolling (TSCR) process,using test methods such as SEM,EDS and measuring content of inclusions, the influencing factor of controlling inclusions during producing middle and high carbon steel was studied. The technologies of electric furnace smelting, LF refining and controlling inclusions of tundish were proposed. The inclusions control level of middle and high carbon steel in which the carbon content is 0.3-1.0%, The level reached and even exceeded the level of like product producing with conventional process at home and abroad.

关键词： thin slab casting and rolling (TSCR) middle and high carbon steel inclusions

Trace element geochemistry of the Lower Cambrian black rock series from northwestern Hunan, South china

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2004年第1期14卷 65-71页

作者： PAN Jiayong 1,2. *, MA Dongsheng 1 and CAO Shuanglin 1,2. (1.The State Key Laboratory for Mineral Deposits research, Nanjing University, Nanjing 2.0093,{2. 2. East{2. institute of Technology, Fuzhou 344000,{2.) Nanjing Univ State Key Lab Mineral Deposit Res Nanjing 210093 Peoples R China E china Inst Technol Fuzhou 344000 Peoples R China

Samples of black rock series collected from the Lower Cambrian Niutitang Formation, northwestern Hunan Province, china, were analyzed for trace elements. The trace element geochemical characteristics of the ore layer (high enrichments of Ni, Mo, V, U, Cu, Pb, Zn, Cd, Tl and Ba; high U/Th ratios and LREE enriched patterns with positive Eu and Y anomalies) support the assumption that the Ni Mo polymetallic layer is of submarine hydrothermal origin. High field strength elements (HFSE) and lithophile elements such as Nb, Ta, Zr, Hf, Li, Be, Rb, Cs, Th and Sc are remarkably higher in the upper unit than those in the lower unit of the Niutitang Formation. These features may reflect that hydrothermal contributions were diminished, and terrigenous constituents were increased in the sediments of the upper unit of the Niutitang Formation.

关键词： black rock series Early Cambrian trace elements northwestern Hunan china

Numerical research on the 3D fiber orientation distribution in arbitrary planar flows

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第11期17卷 1357-1362页

作者： Zhou Kun1 and Lin Jianzhong1,2.1. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 31002., china 2. china Jiliang University, Hangzhou 310018, china) State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China china Jiliang University Hangzhou 310018 China

The fiber orientation distribution in a fiber suspension flow was investigated by a finite difference scheme in spherical coordinates. The diffusivity was transformed between Cartesian and spherical coordinates through tensor analysis to obtain efficiency. It is found that under simple shear flow condition the diffusivity in the azimuthal direction, Dr, has greater effect on the orientation distribution than that in the colatitude direction, Drθθ.

关键词： fiber suspension flow orientation distribution diffusivity

research OF THE MEAN COOK DISTANCE AND THE ROBUST ESTIMATE OF SCALE PARAMETER

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 University 1997年第1期9卷 61-64页

作者： Wang Zhizhong(institute of Surverying Engineering and Land Information, Central SouthUniversity of Technology, changsha 410083,{2.) institute of Surverying Engineering and Land Information Central South University of Technology Changsha 410083 China

Based on the principle of statistics and the research results by Zhu Jianjun, the paper establishesthe mean Cook distance of scale parameter and studies its properties. The paper still presents the robust estimate of scale parameter with minimum mean Cook distance and theoretically shows that scale parameter isnot "nuisance parameter" and it determined by the plus weight squared sums of the residuals of observations.A simple numerical example is given.

关键词： Cook distance robust estimate scale parameter

In situ reproductive organs of Early Cretaceous ferns from Northeast china

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第23期42卷 1977-1980,2026页

作者： DENG Shenghui and CHEN Fen1. research institute of Petroleum and Development, Beijing 100083 2.{2. University of Geosciences, Beijing 100083,{2. research institute of Petroleum and Development Beijing china University of Geosciences Beijing China

FILICOPSIDA is a predominant group of the Early Cretaceous floras of Northeast china, whichapproximates 100 species and accounts for more than one third of the floras. The majority ofthis group are of great importance and significance in stratigraphy. The previous studies ofthese ferns are mainly morphological, with only a few concerning the in situ spores andsporangia. In recent years. the authors have carried out a research project on the in situreproductive organs of the Early Cretaceous ferns from/ basins of Inner Mongolia, Liaoning,Jilin and Heilongjiang of Northeast china. The study focuses on 35 species of 17 genera be-longing to 10 families. The present note briefly introduces the results of this study by listingsome representative species.

关键词： Northeast china Early Cretaceous Filicopsida in situ reproductive organs.

research of Interaction Force Coefficients Based on Model Test in Loading Condition

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2010年第2期15卷 168-171页

作者：刘小健黄国樑邓德衡 Ship Hydrodynamic Laboratory Division Marine Design and Research Institute of China State Key Laboratory of Ocean Engineering Shanghai Jiaotong University

It is very difficult,for the component-type ship mathematical model,to estimate the interaction force coefficients among the hull,propeller and rudder. Some coefficients such as wake fraction and flow straightening coefficient were studied from the model tests in diffierent loading conditions and the normal force of rudder was tested in captive model tests to obtain the coefficients. From these results of the tests,the flow straightening coefficients increase with the increase of trims or drafts. Similarly,wake fraction coefficients are larger for the large drafts,however,become small as the trims increase. The resistance is obviously different in fully loaded condition with the trims by stern,however ,the difference is not evident when the draft decreases and the bulbous bow is above the water surface.

关键词： interaction force coefficient rudder normal force loading condition model test

Fabrication of Ni-decorated helical ribbon composite microstructure from self-assembled lipid tubule by electroless metallization

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2006年第3期49卷 238-245页

作者： FU Yubin1,2. ZHANG Lide1 & ZHENG Jiyong2.1. institute of Solid State Physics, china Academy of Sciences, Hefei {2.031, china 2. Luoyang Ship Material research institute, Luoyang 471039, china 1. institute of Solid State Physics China Academy of Sciences Hefei 230031 China 2. Luoyang Ship Material research institute Luoyang 471039 China

Lipid molecules can self-assemble into a tubular structure, which is formed by tightly wound helical ribbons. Lipid tubules are utilized as a precursor to fabricate a novel Ni-decorated helical ribbon composite microstructure in a high yield by electroless deposition. The microstructure carries Ni nanoparticles on the flat face and wires at the edge of helical ribbon, in which the average size of nanoparticles is about 40―60 nm, and the wires are of a layered structure strongly correlated with a multi-bilayer structure in the lipid membrane. Compared with the tubular precursor, the Ni-decorated composite microstructure becomes short and irregular shapes due to the breakage in the deposition, and its formation is largely bound up with the tubular helical structure and the different catalytic process. Finally, the helical composite microstructure would have a potential application in the development of electric active materials.

关键词： molecular self-assembly, lipid tubule, helical ribbon, electroless deposition, nanoparticles and wires, composite microstructure.