咨询与建议

限定检索结果

文献类型

  • 5,595 篇 期刊文献
  • 1,768 篇 会议

馆藏范围

  • 7,363 篇 电子文献
  • 0 种 纸本馆藏

日期分布

学科分类号

  • 3,543 篇 工学
    • 482 篇 材料科学与工程(可...
    • 365 篇 化学工程与技术
    • 305 篇 计算机科学与技术...
    • 298 篇 机械工程
    • 287 篇 仪器科学与技术
    • 253 篇 地质资源与地质工...
    • 249 篇 环境科学与工程(可...
    • 247 篇 电子科学与技术(可...
    • 226 篇 控制科学与工程
    • 195 篇 软件工程
    • 174 篇 信息与通信工程
    • 172 篇 水利工程
    • 171 篇 农业工程
  • 2,104 篇 理学
    • 389 篇 生物学
    • 311 篇 大气科学
    • 258 篇 化学
    • 236 篇 物理学
    • 205 篇 地质学
    • 187 篇 生态学
    • 147 篇 数学
  • 1,539 篇 医学
    • 824 篇 临床医学
    • 250 篇 公共卫生与预防医...
    • 195 篇 中西医结合
    • 189 篇 基础医学(可授医学...
    • 178 篇 药学(可授医学、理...
  • 738 篇 农学
    • 263 篇 作物学
    • 245 篇 农业资源与环境
  • 488 篇 管理学
    • 236 篇 管理科学与工程(可...
    • 151 篇 公共管理
  • 187 篇 经济学
    • 156 篇 应用经济学
  • 184 篇 教育学
  • 79 篇 法学
  • 54 篇 军事学
  • 51 篇 文学
  • 37 篇 艺术学
  • 29 篇 历史学
  • 16 篇 哲学

主题

  • 76 篇 中国
  • 65 篇 指南
  • 35 篇 model
  • 34 篇 and
  • 33 篇 共识
  • 33 篇 of
  • 28 篇 稀土
  • 25 篇 simulation
  • 24 篇 专家共识
  • 22 篇 diagnosis
  • 22 篇 treatment
  • 22 篇 china
  • 19 篇 老年人
  • 16 篇 analysis
  • 16 篇 美国
  • 16 篇 soil
  • 16 篇 诊断
  • 15 篇 质量控制
  • 15 篇 shrimp
  • 14 篇 sustainable deve...

机构

  • 211 篇 北京大学
  • 109 篇 清华大学
  • 87 篇 北京师范大学
  • 85 篇 中国科学院大学
  • 63 篇 石油大学
  • 61 篇 解放军总医院
  • 60 篇 中国农业大学
  • 57 篇 中国地质大学
  • 50 篇 北京邮电大学
  • 49 篇 北京理工大学
  • 46 篇 中国科学院生态环...
  • 43 篇 北京航空航天大学
  • 41 篇 中国医学科学院
  • 38 篇 北京大学人民医院
  • 36 篇 中国人民大学
  • 34 篇 北京医院
  • 34 篇 北京科技大学
  • 30 篇 北京大学第一医院
  • 29 篇 首都师范大学
  • 29 篇 北京工业大学

作者

  • 269 篇 china
  • 67 篇 beijing
  • 34 篇 p.r.china
  • 28 篇 china)
  • 24 篇 陈君石
  • 22 篇 beijing 100083
  • 22 篇 陈铮鸣
  • 21 篇 tsinghua univers...
  • 18 篇 赫捷
  • 17 篇 china.
  • 16 篇 李兆申
  • 16 篇 成军
  • 15 篇 2 graduate unive...
  • 15 篇 马飞
  • 15 篇 陈万青
  • 15 篇 国家老年医学中心
  • 15 篇 peking universit...
  • 14 篇 杨方廷
  • 14 篇 p. r. china
  • 14 篇 beijing 100084

语言

  • 4,029 篇 英文
  • 3,334 篇 中文
检索条件"作者=3. beijing center of shrimp, {13., China"
7363 条 记 录,以下是71-80 订阅
排序:
Isomerization of B_6,B_6^- and B_6^+ clusters
收藏 引用
Science china Chemistry 2010年 第1期53卷 202-209页
作者: WEI GongMin1,PU ZhiFeng2,ZOU Rong3.LI GuoLiang2,3.& LUO Qiong2,3.1Department of Physics,Capital Normal University,beijing 100048,china 2State Key Laboratory of Explosion Science and Technology beijing Institute of Technology,beijing 100081,china 3.5} for Computational Quantum Chemistry,South china Normal University,Guangzhou 51063.,china 1. Department of Physics Capital Normal University Beijing 100048 China2. State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China3. Center for Computational Quantum Chemistry South China Normal University Guangzhou 510631 China
The interconversions between isomers with the same spin multiplicity of neutral B6 and charged B6-and B6+ clusters have been investigated at the B3.YP/6-3.1+G level of theory,including determination of the minimum ene... 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
BRST quantization and canonical Ward identity of the supersymmetric electromagnetic interaction system
收藏 引用
Science china(Physics,Mechanics & Astronomy) 2007年 第3期50卷 339-347页
作者: HUANG YongChang1,3.4, JIANG YunGuo1 & LI XinGuo2,3.1 Institute of Theoretical Physics, College of Applied Sciences, beijing University of Technology, beijing 100022, china 2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73.000, china 3.center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Collisions, Chinese Academy of Sciences, Lanzhou 73.000, china 4 china center of Advanced Science and Technology (World Laboratory), beijing 100080, china 1. Institute of Theoretical Physics College of Applied Sciences Beijing University of Technology Beijing 100022 China 3. center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Collisions Chinese Academy of Sciences Lanzhou 730000 China 4. china center of Advanced Science and Technology (World Laboratory) Beijing 100080 China 2. Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China
According to the method of path integral quantization for the canonical constrained system in Becchi-Rouet-Stora-Tyutin scheme, the supersymmetric electromagnetic interaction system was quantized. Both the Hamiltonian... 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
Carbon isotope ratios of C_(4) plants in loess areas of North china
收藏 引用
Science china Earth Sciences 2006年 第1期49卷 97-102页
作者: WANG Guoan1,2,3. HAN Jiamao 2, ZHOU Liping3. XIONG Xiaogang4, TAN Ming2, WU Zhenhai5 & PENG Jun6 1. Department of Plant Nutrition, china Agricultural University, beijing 100094, china 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, beijing 100029, china 3. College of Environmental Sciences, MOE Laboratory for Earth Surface Processes, Peking University, beijing 100871, china 4. Institute of Botany, Chinese Academy of Sciences, beijing 100093. china 5. Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, china 6. Network center, china Agricultural University, beijing 100094, china 1. Department of Plant Nutrition China Agricultural University Beijing 100094 China 2. Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China 3. College of Environmental Sciences MOE Laboratory for Earth Surface Processes Peking University Beijing 100871 China 4. Institute of Botany Chinese Academy of Sciences Beijing 100093 China 5. Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100 China 6. Network center China Agricultural University Beijing 100094 China
Carbon isotope ratios (δ^(13.C) of 89 C_4 plant samples were determined fromthe loess area in North china. δ^(13.C values vary between -10.5per thousand and -14.6per thousandwith a mean of -12.6per thousand. Along 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
A TTCN-3.based protocol testing system and its extension
收藏 引用
Science in china(Series F) 2008年 第11期51卷 1703-1722页
作者: YIN Xia1,3.WANG ZhiLiang2,3.JING ChuanMing1,3.& SHI XinGang2,3.1 Department of Computer Science and Technology,Tsinghua University,beijing 100084,china 2 Network Research center,Tsinghua University,beijing 100084,china 3.Tsinghua National Laboratory for Information Science and Technology(TNList) ,beijing 100084,china 1. Department of Computer Science and Technology Tsinghua University Beijing 100084 China 3. ]Tsinghua National Laboratory for Information Science and Technology (TNList) Beijing 100084 China 2. Network Research center Tsinghua University Beijing 100084 China
The protocol testing technology used in the next generation Internet should satisfy some new challenges and requirements. This paper focuses on the test suite description and test implementation techniques. TTCN-3.is ... 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
Joint exploration of crustal structure in Fuzhou basin and its vicinities by deep seismic reflection and high-resolution refraction as well as wide-angle reflection/refraction
收藏 引用
Science china Earth Sciences 2005年 第7期48卷 925-938页
作者: ZHU Jinfang1, XU Xiwei2, ZHANG Xiankang3. HUANG Zonglin1, CHEN Xiangxiong1, FANG Shengming3. LIU Baojin3. ZHENG Rongzhang2,4 1. Seismological Bureau of Fujian Province,Fuzhou 3.0003.china 2. Institute of Geology,china Earthquake Administration,beijing 100029,china 3. Research center for Exploration Geophysics,china Earthquake Administration,Zhengzhou 450002,china 4. State Key Laboratory of Earthquake Dynamics,Institute of Geology,china Earthquake Administration,beijing 100029,china Seismological Bureau of Fujian Province Fuzhou 350003 China Institute of Geology China Earthquake Administration Beijing 100029 China Research center for Exploration Geophysics China Earthquake Administration Zhengzhou 450002 China State Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing 100029 China
The Fuzhou basin and its vicinities are located at the northern end of the southeastern coastal seismic zone of the mainland of china. By the joint explorations of high-resolution seismic refraction and wide-angle ref... 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
Multi-level decollement zones and detachment deformation of Longmenshan thrust belt,Sichuan Basin,southwest china
收藏 引用
Science china Earth Sciences 2008年 第S2期51卷 32-43页
作者: TANG LiangJie1,2,3.YANG KeMing4,JIN WenZheng1,2,3.L ZhiZhou4 & YU YiXin1,2,3.1 State Key Laboratory of Petroleum Resource and Prospecting,china University of Petroleum,beijing 102249,china 2 Key Laboratory for Hydrocarbon Accumulation Mechanism,china University of Petroleum,Ministry of Education,beijing 102249,china 3.Basin and Reservoir Research center,china University of Petroleum,beijing 102249,china 4 Southwest Division Company,SINOPEC,Chengdu 610081,china 1. State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China 2. Key Laboratory for Hydrocarbon Accumulation Mechanism China University of Petroleum Ministry of Education Beijing 102249 China 3. Basin and Reservoir Research center China University of Petroleum Beijing 102249 China 4. Southwest Division Company SINOPEC Chengdu 610081 China
As is well known that many decollement layers were developed in the Longmenshan thrust belt,Si-chuan Basin,china. Through field investigation,explanation of seismic profiles and analysis of the balanced sections,we ca... 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
Archean relic body at lower crust in Sulu area:Evidence from magnetic data
收藏 引用
Chinese Science Bulletin 2003年 第6期48卷 589-593页
作者: WU Qifan1,2, LU Fengxiang3. LIU Qingsheng3. ZHENG Jianping3. WANG Maoji2 & WU Wenli4 1. Department of Engineering Physics, Tsinghua University, beijing 100084, china 2. Aero Geophysical Survey & Remote Sensing center, beijing 100083. china 3. china University of Geosciences, Wuhan 43.074, china 4. Institute of Geophysical & Geochemical Exploration, Langfang 065000, china Aero Geophysical Survey & Remote Sensing center Beijing 100083 China china University of Geosciences Wuhan 430074 China Institute of Geophysical & Geochemical Exploration Langfang 065000 China Department of Engineering Physics Tsinghua University Beijing 100084 China
After the new 1︰1000000 aero magnetic data were processed and the three-dimensional inversion work was carried out, a vast high magnetic body northwestward was discovered. The magnetic body is located at the depth of... 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
Nontrivial homoclinic orbits for second-order singular and periodic Hamiltonian systems
收藏 引用
Chinese Science Bulletin 1999年 第2期44卷 123-129页
作者: LI Chengyue , FAN Tianyou TONG MingshengResearch center of Materials Science, beijing Institute of Technology, beijing 100081,{3. Department of Mathematics, Central University for Nationalities, beijing 100081,{3. Computer center, beijing Institute of Technology, beijing 100081,{3. Research center of Materials Science Beijing Institute of Technology Beijing China Department of Mathematics Central University for Nationalities Beijing China Computer center Beijing Institute of Technology Beijing China
The existence of nontrivial homoclinic orbits of periodic Hamiltonian systems: is proved, where q=(q1,q2,’',qn), n>2; V(t, q):R1×Rn\{e}→R1 is a potential With a singularity, i.e. -V(t, q)→+∞, as q→e. 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
Dense coding scheme using superpositions of Bell-states and its NMR implementation
收藏 引用
Science china(Physics,Mechanics & Astronomy) 2005年 第1期48卷 57-67页
作者: ZHANG Jingfu, XIE Jingyi, DENG Zhiwei & LU Zhiheng Key Laboratory for Quantum Information and Measurements, Department of Physics, Tsinghua University, beijing 100084, china center for Quantum Information, Tsinghua University, beijing 100084, china Department of Materials Science and Engineering, beijing Normal University, beijing 100875, china Testing and Analytical center, beijing Normal University, beijing 100875, china Department of Physics, beijing Normal University, beijing 100875, china 1. Key Laboratory for Quantum Information and Measurements Department of Physics Tsinghua University 100084 Beijing China 2. center for Quantum Information Tsinghua University 100084 Beijing China 3. Department of Materials Science and Engineering Beijing Normal University 100875 Beijing China 4. Testing and Analytical center Beijing Normal University 100875 Beijing China 5. Department of Physics Beijing Normal University 100875 Beijing China
Dense coding using superpositions of Bell-states is proposed. The generalized Grover's algorithm is used to prepare the initial entangled states, and the reverse process of the quantum algorithm is used to determine t... 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 improvement to the data processing course of electrochemical impedance technique
收藏 引用
Journal of University of Science and Technology beijing 2003年 第6期10卷 57-60页
作者: Yinglv Jiang, Yinshun Wu, and Hong ChuCorrosion and Protection center, University of Science and Technology beijing, beijing 100083.{3. Corrosion and Protection Ctr. Univ. of Sci. and Technol. Beijing Beijing 100083 China
For some electrochemical systems the traditional data processing methods cannot be met, so it is necessary to develop a new method to deal with these problems. When processingthe electrochemical AC impedance data of t... 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