检索结果-南通市图书馆

chinese Journal of Population,Resources and Environment 2004年第4期2卷 53-56页

作者： Li Zhongxue & Xia Qing university of Science and Technology beijing, beijing 700083. China university of Science and Technology beijing Beijing 100083 China

In view of sustainable development, this paper presents the challenges faced by the global mining sectors, outlines an integrated approach of the global minerals industry for sustainable development, introduces actions for the mineral professionals toward sustainable development, and proposes changes in the mineral operations, management, and governance practices in the chinese perspective.

关键词： Sustainable development mining mineral sector mineral industry

在线全文

学校读者我要写书评

暂无评论

基于H.2.3.频解码的错误检测和掩盖

通信学报 2001年第12期22卷 82-87页

作者：高绍帅涂国防中国科学院研究生院信息与工程学院北京100039 中国科学院研究生院信息安全国家重点实验室北京100039

本文提出了一种应用于H.2.3.频编码传输的纠错方法,即基于H.2.3.频解码的错误检测和掩盖算法。这种算法可应用于公共交换电话网(PSTN),Internet或移动信道的视频通信。模拟结果表明,这种纠错方法在不降低编码效率的前提下,使在有噪声... 详细信息

本文提出了一种应用于H.2.3.频编码传输的纠错方法,即基于H.2.3.频解码的错误检测和掩盖算法。这种算法可应用于公共交换电话网(PSTN),Internet或移动信道的视频通信。模拟结果表明,这种纠错方法在不降低编码效率的前提下,使在有噪声干扰的信道上传输图像的质量有显著的改善。

关键词：错误掩盖错误检测 H.2.3.议视频解码

Characteristics of plasma jet in laser driven magnetic reconnections

在线全文

学校读者我要写书评

暂无评论

Characteristics of plasma jet in laser driven magnetic recon...

A STUDY ON THE MECHANISM AND CHARACTEROF THE INDUSTRIALAND SPATIAL TRANSFERENCE OF FDI IN CHINA

第十五届全国等离子体科学技术会议

作者： Xun Liu1,~,Yutong Li1,+,Jiayong Zhong2.Quanli Dong1,Shoujun Wang1,Lei Zhang1,Jianqiang Zhu3.Gang Zhao2.and Jie Zhang1,4,+ 1 beijing National Laboratory for Condensed Matter Physics,Institute of Physics,{3. {2. of {3.,beijing 100190,China, 2.Key Laboratory of Optical Astronomy,National Astronomical Observatories,{3. {2. of {3.,beijing 100012.China, 3.National Laboratory on High Power Lasers and Physics,Shanghai,2.1800,China, 4 Key Laboratory for Laser Plasmas(Ministry of Education) and Department of Physics,Shanghai Jiao Tong university,Shanghai 2.02.0,China.

The jet driven by magnetic reconnection in laser-plasma interactions is investigated *** diagnostics in the optical and x-ray ranges provide detailed information about the jet *** plasma jets perpendicular to and alon... 详细信息

关键词： laboratory astrophysics jet magnetic reconnection laser-plasma

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

chinese Geographical Science 2001年第1期11卷 1-10页

作者： LI Guo-ping, YANG Kai-zhong, HE Qi-chun, SUN Tie-shan (Department of Urban and Environmental sciences, Peking university, {2. 100871, P. R. China) Department of Urban and Environmental sciences Peking University Beijing P. R. China

In the last two decades, China has become one of the areas that have the greatest potential in industrial production, thus it has ranked second only to USA in the flow of international capital. By the end of 1998, the real value of FDI (Foreign Direct Investment) in China has utilized has added up to $2.8.1 billion. The big flow of FDI has not only promoted the development of social economy, but also worsened the existing regional difference by choosing spatial location. Under this circumstance, China’s economy faces new restrictions and opportunities while adjusting its regional structure and industrial structure. So it is more and more important for us how to seize the opportunity, to seek the regularity of FDI in choosing location from the aspect of space, to set up relevant strategy to direct FDI at inland regions (areas deficient of capital), and to make appropriate policies, esp. the industrial and regional policies so as for FDI to exert positive influence and avoid negative influence on China and its regional economy and society. Based on the latest domestic and overseas materials and data of the FDI in China, combining with the investigation of the enterprises, this paper has systematically revealed the progress of development of the FDI in China and the developing conditions of the main enterprises directly invested by foreign capital since the reform and opening-up in China. The characters of FDI such as spatial concentration, transference as time goes on, change of the technical content and up-gradation of industrial structure and their forming mechanism have been studied. Then the basic conclusions have been made as follows. Firstly, FDI has been highly concentrated in space. But as time goes by, it has been transferring from coastal regions to inland ones, from big cities to their surrounding districts, and the degree of concentration is decreasing. Secondly, the technical content of the invested projects has gradually increased and the up-gradation of

关键词： FDI in China industrial transference spatial transference character mechanism

小鼠热休克蛋白gp96羧基端片段的克隆、表达及纯化

在线全文

学校读者我要写书评

暂无评论

生物工程学报 2004年第4期20卷 619-622页

作者：韩金乐李宏涛李集林田波中国科学院微生物研究所北京100080 哈尔滨师范大学哈尔滨150080

热休克蛋白 (Heatshockprotein )gp96 (Grp94 )是近年来新发现的一类糖蛋白 ,除了分子伴侣的功能外 ,现有越来越多的文献报道了它在先天性免疫和获得性免疫中的重要作用。gp96可以促进抗原呈递细胞的成熟以及细胞因子的分泌。热休克蛋... 详细信息

热休克蛋白 (Heatshockprotein )gp96 (Grp94 )是近年来新发现的一类糖蛋白 ,除了分子伴侣的功能外 ,现有越来越多的文献报道了它在先天性免疫和获得性免疫中的重要作用。gp96可以促进抗原呈递细胞的成熟以及细胞因子的分泌。热休克蛋白抗原肽复合体可以引起特异性的细胞毒T淋巴细胞效应 ,应用这个特点可以设计抗病毒及抗肿瘤药物[1 ] 。但是gp96全长分子量大 ,蛋白在大肠杆菌中表达量低 ,不稳定 ,难纯化。组织提取的gp96又受组织来源和样品量的限制。对gp96的结构和功能的研究带来困难。克隆并表达了小鼠热休克蛋白gp96的羧基端 5 6 0 75 1aa约四分之一长的功能片段 ,该段包含gp96的一个肽结合区和二聚化位点[2.] 。将该功能片段在大肠杆菌中进行融合表达 ,纯化后将融合的片段切掉 ,并对目的片段进行了分析 ,结果表明该段可能是形成二聚体密切相关的片段。

关键词：热休克蛋白 gp96 融合表达

在线全文

学校读者我要写书评

暂无评论

基于串行背板技术的声呐数据传输系统设计

微计算机应用 2004年第3期25卷 257-261页

作者：郑剑锋李启虎孙长瑜中国科学院研究生院北京100039 中国科学院声学研究所北京100080

根据拖曳线列阵声呐工作特点和水声信号传输的特殊要求 ,提出了一种基于高速背板串行传输技术的全数字式水声信号多路传输方法。该方法选用CY7B92.3.CY7B93.作为物理层芯片解决水声信号的高速串行传输 ,采用复用 /竞争的思想实现多路数... 详细信息

根据拖曳线列阵声呐工作特点和水声信号传输的特殊要求 ,提出了一种基于高速背板串行传输技术的全数字式水声信号多路传输方法。该方法选用CY7B92.3.CY7B93.作为物理层芯片解决水声信号的高速串行传输 ,采用复用 /竞争的思想实现多路数据混合传输 ,并通过同步互联技术解决模块间的同步采集问题。硬件上设计了以可编程逻辑器件为核心的数据采集模块和串行背板传输模块。该系统可适用于传输电缆体积受到严格限制。

关键词：串行背板拖曳线列阵声呐数据传输同步互联 CY7892./CY7893. 可编程逻辑器件

在线全文

学校读者我要写书评

暂无评论

2.糖尿病患者卒中预防及血糖管理专家共识

中华内科杂志 2024年第7期63卷 649-659页

作者：《2.糖尿病患者卒中预防及血糖管理专家共识》编写委员会陈莉明母义明不详天津医科大学朱宪彝纪念医院内分泌科天津300134 解放军总医院第一医学中心内分泌科北京100853

糖代谢异常与卒中关系密切,对卒中的发生、发展及预后均有不良影响。良好的血糖控制对改善卒中预后具有重要意义。部分降糖药物能够减少2.糖尿病患者卒中的发生及复发风险。2.糖尿病合并卒中患者应控制血压、血脂,合理应用抗血小板药... 详细信息

糖代谢异常与卒中关系密切,对卒中的发生、发展及预后均有不良影响。良好的血糖控制对改善卒中预后具有重要意义。部分降糖药物能够减少2.糖尿病患者卒中的发生及复发风险。2.糖尿病合并卒中患者应控制血压、血脂,合理应用抗血小板药物。共识专家组基于循证医学证据和临床实践,并经过多次讨论最终形成本共识,以期为临床提供参考。

关键词：糖尿病 2. 卒中预防血糖管理专家共识

Lactonization of 5-Phenylfuran-4-arylcarbinol-3.carboxylic Acids under the Catalysis of Boron Trifluoridc Etherate

在线全文

学校读者我要写书评

暂无评论

chinese Chemical Letters 1999年第2期10卷 103-104页

作者： Xiao Ping NIE Xiu Lin YE (Department of Chemistry, Peking university． beijing， 100871) Department of Chemistry Peking University Beijing 100871 China

?-Phenyl－4－aroylfuran－3.carboxylic acids were reduced in aqueous alkaline solutions ofNaBH4 to afford hydroxy acids in excellent yields． Under the catalysis of boron trifluoride etherate，the hydroxy acids were c... 详细信息

关键词： Lactonization boron trifluoride etherate hydroxy acid

A new cubic equation of state and its applications to the modeling of vapor-liquid equilibria and *** of natural fluids

在线全文

学校读者我要写书评

暂无评论

A new cubic equation of state and its applications to the mo...