咨询与建议

限定检索结果

文献类型

  • 49,525 篇 期刊文献
  • 10,688 篇 会议
  • 1 册 图书

馆藏范围

  • 60,213 篇 电子文献
  • 1 种 纸本馆藏

日期分布

学科分类号

  • 25,159 篇 工学
    • 5,307 篇 化学工程与技术
    • 3,598 篇 材料科学与工程(可...
    • 1,850 篇 机械工程
    • 1,840 篇 控制科学与工程
    • 1,825 篇 电子科学与技术(可...
    • 1,781 篇 计算机科学与技术...
    • 1,671 篇 仪器科学与技术
    • 1,403 篇 软件工程
    • 1,284 篇 地质资源与地质工...
    • 1,141 篇 水利工程
    • 1,041 篇 光学工程
    • 1,030 篇 生物工程
  • 18,414 篇 理学
    • 5,162 篇 化学
    • 3,398 篇 生物学
    • 2,809 篇 数学
    • 1,883 篇 物理学
    • 1,426 篇 地质学
    • 1,000 篇 生态学
    • 996 篇 系统科学
  • 16,495 篇 医学
    • 7,993 篇 临床医学
    • 3,725 篇 中西医结合
    • 2,460 篇 药学(可授医学、理...
    • 2,173 篇 中药学(可授医学、...
    • 1,462 篇 基础医学(可授医学...
    • 1,363 篇 中医学
    • 1,092 篇 公共卫生与预防医...
  • 6,285 篇 农学
    • 2,028 篇 作物学
    • 1,664 篇 农业资源与环境
  • 3,066 篇 管理学
    • 1,562 篇 管理科学与工程(可...
  • 2,114 篇 教育学
  • 1,410 篇 经济学
    • 1,250 篇 应用经济学
  • 792 篇 文学
  • 742 篇 法学
  • 273 篇 历史学
  • 267 篇 哲学
  • 254 篇 艺术学
  • 152 篇 军事学

主题

  • 448 篇 稀土
  • 427 篇 治疗
  • 363 篇 中国
  • 239 篇 诊断
  • 226 篇 of
  • 180 篇 大鼠
  • 152 篇 专家共识
  • 137 篇 and
  • 125 篇 合成
  • 111 篇 实验研究
  • 110 篇 china
  • 108 篇 配合物
  • 107 篇 儿童
  • 100 篇 crystal structur...
  • 94 篇 synthesis
  • 87 篇 analysis
  • 85 篇 化学成分
  • 82 篇 表达
  • 81 篇 中药
  • 80 篇 指南

机构

  • 1,509 篇 北京大学
  • 1,318 篇 清华大学
  • 1,018 篇 北京师范大学
  • 580 篇 中国科学院大学
  • 405 篇 中国农业大学
  • 355 篇 首都师范大学
  • 331 篇 北京航空航天大学
  • 327 篇 中国地质大学
  • 326 篇 南京大学
  • 315 篇 北京科技大学
  • 284 篇 山东大学
  • 262 篇 北京中医药大学
  • 261 篇 石油大学
  • 223 篇 浙江大学
  • 219 篇 复旦大学
  • 210 篇 北京交通大学
  • 203 篇 四川大学
  • 193 篇 中国人民大学
  • 183 篇 中国科学院研究生...
  • 182 篇 北京工业大学

作者

  • 1,357 篇 china
  • 275 篇 beijing
  • 175 篇 tsinghua univers...
  • 106 篇 p.r.china
  • 93 篇 chinese academy ...
  • 89 篇 2 graduate unive...
  • 64 篇 shanghai
  • 64 篇 china.
  • 47 篇 张杰
  • 42 篇 哈木拉提·吾甫尔
  • 40 篇 china)
  • 37 篇 张敏
  • 34 篇 张波
  • 30 篇 刘杰
  • 30 篇 beijing 100094
  • 30 篇 zhejiang univers...
  • 23 篇 张岩
  • 23 篇 李燕
  • 23 篇 王建华
  • 22 篇 王慧

语言

  • 36,032 篇 中文
  • 24,182 篇 英文
检索条件"作者=2. {1. university of Chinese Academy of Sciences, Beijing 1.0049, China"
60214 条 记 录,以下是1-10 订阅
排序:
Mineralogy and crystal structure determination of Mg-fillowite
收藏 引用
Science china Earth {1. 2005年 第5期48卷 635-646页
作者: MA Zhesheng 1., SHI Nicheng 1.& YE Danian 2.1.{1. university of Geo{2., beijing 1.0083,{1. 2. Institute of Geology, chinese academy of {2., beijing 1.002.,{1. 1. china {1. of Geo{2. 100083 Beijing China 2. Institute of Geology Chinese Academy of Sciences 100029 Beijing China
Accurate crystal structure determination of complex phosphate Mg-fillowite ? Na2.a(Mn4Mg2.e)7[PO4]6 has been finished. Mg-fillowite occurs in muscovite-pegmatite in the Altay area, Xinjiang, china. It is of the trigon... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Research on the method for retrieving soil moisture using thermal inertia model
收藏 引用
Science china Earth {1. 2006年 第5期49卷 539-545页
作者: LIU Zhenhua1 & ZHAO Yingshi2.1. Information College, South china Agricultural university, Guangzhou 510642. china 2. Graduate university of chinese academy of sciences, beijing 1.0049, china 1. Information College South China Agricultural University Guangzhou 510642 China 2. Graduate {1. of chinese {2. of sciences Beijing 100049 China
In order to improve accuracy of soil moisture inversion using remote sensing, a new thermal inertia model is proposed in this paper. The improved model needs only surface maximum temperature as the temperature paramet... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Explicit analytical solutions of the anisotropic Brinkman model for the natural convection in porous media(Ⅱ)
收藏 引用
Science china(Physics,Mechanics & Astronomy) 2005年 第4期48卷 422-430页
作者: CAI Ruixian1. GOU Chenhua1. 2.& ZHANG Na1.1. Institute of Engineering Thermophysics, {1. academy of {2., beijing 1.0080, china 2. Graduate School, {1. academy of {2., beijing 1.0080, china 1. Institute of Engineering Thermophysics Chinese Academy of Sciences 100080 Beijing China 2. Graduate School Chinese Academy of Sciences 10080 Beijing China
Some algebraically explicit analytical solutions are derived for the anisotropic Brinkman model―an improved Darcy model―describing the natural convection in porous media. Besides their important theoretical meaning ... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Nonlinear interactions between gravity waves and background winds
收藏 引用
Progress in Natural Science:Materials International 2007年 第6期17卷 639-644页
作者: Liu Xiao1.2.and Xu Jiyao1.1. State Key Laboratory for Space Weather, Center for Space Science and Applied Research, {1. academy of {2., beijing 1.0080, china 2. Graduate university of {1. academy of {2., beijing 1.0039, china) [a]State Key Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing China [b]Graduate university of {1. {2. of sciences Beijing China
Using the nonlinear propagating gravity waves (GW) model in the two-dimensional compressible atmosphere and the linear GW theory, the process of GW propagation in different background winds, e.g. the direction of the ... 详细信息
来源: 同方期刊数据库 同方期刊数据库 评论
Algebraically explicit analytical solu-tions for the unsteady non-Newtonian swirling flow in an annular pipe
收藏 引用
Science china(Physics,Mechanics & Astronomy) 2006年 第4期49卷 396-400页
作者: CAI Ruixian1.& GOU Chenhua1.2.1. Institute of Engineering Thermophysics, {1. academy of {2., beijing 1.0080, china 2. Graduate School, {1. academy of {2., beijing 1.0080, china 1. Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100080 China 2. Graduate School Chinese Academy of Sciences Beijing 100080 China
This paper presents two algebraically explicit analytical solutions for the incompressible unsteady rotational flow of Oldroyd-B type in an annular pipe. The first solution is derived with the common method of separat... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
An integrated decision method for prediction of tropical cyclone movement by using genetic algorithm
收藏 引用
Science china Earth {1. 2005年 第3期48卷 429-440页
作者: YANG Yuanqin1.& WANG Jizhi2.1. National Meteorological Center, {1. 1.0081.china 2. {2. academy of Meteorological sciences, {1. 1.0081. china 1. National Meteorological Center 100081 Beijing China 2. {1. academy of Meteorological {2. 100081 Beijing China
In this study an integrated decision method for the multi-prediction results of tropical cyclone movements by using genetic algorithm (GA) has been adopted. A genetic learning artifi- cial neural network (GLANN) as a ... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Structures and physical properties of rigid polyurethane foams with water as the sole blowing agent
收藏 引用
Science china Chemistry 2006年 第4期49卷 363-370页
作者: LI Xiaobin1.2. CAO Hongbin1.& ZHANG Yi1.1. Institute of Process Engineering, {1. academy of {2., beijing 1.0080, china 2. Graduate School of the {1. academy of {2., beijing 1.0039, china 1. Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China 2. Graduate School of the {1. academy of {2. Beijing 100039 China
Rigid polyurethane foams blown by varying water level were prepared in this study. The structures and physical properties of rigid polyurethane foams blown by water were measured with FT-IR, universal testing machine ... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Cloning and characterization of interferon stimulated genes Viperin and ISG1.,and their promoters from snakehead Channa argus
收藏 引用
Progress in Natural Science:Materials International 2007年 第12期17卷 1425-1435页
作者: Jia Weizhang1,2. Zhou Xiuxia1,2. Huang Rong1,2.and Guo Qionglin1(1. Institute of Hydrobiololgy, chinese academy of {2., Wuhan 430072. china 2. Graduate university of chinese academy of {2., beijing 100039, china) Institute of Hydrobiololgy Chinese Academy of Sciences Wuhan 430072 China Graduate university of {1. {2. of sciences Beijing 100039 China
By suppression subtractive hybridization, rapid amplification of cDNA ends and gene walking methods, interferon stimulated genes (ISGs), Viperin and ISG1., and their promoters have been cloned and characterized from s... 详细信息
来源: 同方期刊数据库 同方期刊数据库 评论
Some key technics of drop tower experiment device of National Microgravity Laboratory (china) (NMLC)
收藏 引用
Science china(Technological {1.) 2005年 第3期48卷 305-316页
作者: ZHANG Xiaoqian 1., YUAN Longgen 1., WU Wendong 1., TIAN Lanqiao 2.& YAO Kangzhuang 2.1. Institute of Engineering Thermophysics, chinese academy of {2., beijing 1.0080, china 2. Institute of Mechanics, chinese academy of {2., beijing 1.0080, china 1. Institute of Engineering Thermophysics Chinese Academy of Sciences 100080 Beijing China 2. Institute of Mechanics Chinese Academy of Sciences 100080 Beijing China
Drop tower is an important ground based facility for microgravity science experiment. The technical performances of the drop tower NMLC are advanced compared with similar facilities in the US, Germany and Japan. The m... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Wind vector retrieval using dual polarization imagery of ASAR
收藏 引用
Progress in Natural Science:Materials International 2006年 第11期16卷 1183-1187页
作者: SONG Guiting~ 1,2., HOU Yijun~1** and QI Peng~1(1. Institute of Oceanology, chinese academy of {2., Qingdao 2.6071, china 2. Graduate School, chinese academy of {2., beijing 100039, china) [a]Institute of Oceanology Chinese Academy of Science Qingdao China [b]Graduate School Chinese Academy of Sciences Beijing China
A new algorithm for retrieving wind vector using dual polarization imagery of advanced synthetic aperture radar (ASAR) is developed and tested. Based on the combination of co-polarization and cross-polarization, this ... 详细信息
来源: 同方期刊数据库 同方期刊数据库 评论