咨询与建议

限定检索结果

文献类型

  • 187,624 篇 期刊文献
  • 11,969 篇 会议
  • 288 篇 学位论文

馆藏范围

  • 199,881 篇 电子文献
  • 0 种 纸本馆藏

日期分布

学科分类号

  • 114,006 篇 工学
    • 24,900 篇 材料科学与工程(可...
    • 15,787 篇 电子科学与技术(可...
    • 14,004 篇 化学工程与技术
    • 12,908 篇 计算机科学与技术...
    • 11,755 篇 机械工程
    • 9,946 篇 控制科学与工程
    • 9,042 篇 软件工程
    • 8,990 篇 仪器科学与技术
    • 8,512 篇 光学工程
    • 6,264 篇 力学(可授工学、理...
    • 5,913 篇 动力工程及工程热...
    • 5,767 篇 电气工程
    • 4,262 篇 信息与通信工程
    • 4,032 篇 水利工程
    • 3,777 篇 地质资源与地质工...
    • 3,131 篇 土木工程
  • 83,942 篇 理学
    • 25,834 篇 物理学
    • 19,233 篇 数学
    • 9,176 篇 化学
    • 8,154 篇 生物学
    • 5,704 篇 大气科学
    • 4,829 篇 地质学
    • 4,050 篇 系统科学
    • 3,172 篇 天文学
  • 26,737 篇 医学
    • 16,839 篇 临床医学
    • 3,179 篇 中西医结合
    • 2,913 篇 药学(可授医学、理...
  • 12,131 篇 农学
    • 4,151 篇 作物学
  • 10,661 篇 管理学
    • 8,661 篇 管理科学与工程(可...
  • 4,608 篇 经济学
    • 4,366 篇 应用经济学
  • 956 篇 军事学
  • 891 篇 教育学
  • 782 篇 文学
  • 663 篇 艺术学
  • 606 篇 法学
  • 290 篇 历史学
  • 202 篇 哲学

主题

  • 1,336 篇 of
  • 1,040 篇 deep learning
  • 914 篇 china
  • 881 篇 microstructure
  • 840 篇 stability
  • 827 篇 numerical simula...
  • 824 篇 model
  • 711 篇 cancer
  • 699 篇 machine learning
  • 662 篇 structure
  • 659 篇 simulation
  • 584 篇 system
  • 574 篇 and
  • 568 篇 method
  • 547 篇 mechanical prope...
  • 542 篇 temperature
  • 538 篇 quantum
  • 529 篇 in
  • 499 篇 precipitation
  • 492 篇 analysis

机构

  • 4,208 篇 university of ch...
  • 755 篇 graduate univers...
  • 735 篇 beijing national...
  • 471 篇 北京大学
  • 441 篇 school of physic...
  • 415 篇 state key labora...
  • 402 篇 national astrono...
  • 335 篇 songshan lake ma...
  • 281 篇 institute of phy...
  • 235 篇 university of sc...
  • 218 篇 institute of hig...
  • 212 篇 institute of mod...
  • 200 篇 center of materi...
  • 194 篇 national mobile ...
  • 188 篇 graduate school ...
  • 187 篇 collaborative in...
  • 179 篇 institute of geo...
  • 178 篇 institute of app...
  • 171 篇 state key labora...
  • 163 篇 state key labora...

作者

  • 416 篇 wei wang
  • 357 篇 wei zhang
  • 282 篇 yang liu
  • 268 篇 wei li
  • 242 篇 lei wang
  • 233 篇 lei zhang
  • 230 篇 wei chen
  • 205 篇 yu zhang
  • 196 篇 xin wang
  • 195 篇 jun wang
  • 182 篇 yang li
  • 164 篇 yang yang
  • 157 篇 jun li
  • 156 篇 jing wang
  • 154 篇 wei liu
  • 152 篇 li li
  • 151 篇 jing li
  • 143 篇 jing zhang
  • 143 篇 yan zhang
  • 142 篇 jian wang

语言

  • 175,081 篇 英文
  • 24,782 篇 中文
  • 16 篇 法文
  • 2 篇 日文
检索条件"基金资助= grant"
199881 条 记 录,以下是1-10 订阅
排序:
supported by the National Natural Science Foundation ofChina(grant No.41476131),the Innovation Program of Shanghai Municipal Education Commission(grant No.14ZZ143), the Shanghai Universities Plateau Discipline Project of Marine Sciences and the Peak Discip
收藏 引用
Science China Earth Sciences 2017年 第2期60卷 391-396页
作者: LI Jing SUN Lei YU ZhiMing SONG XiuXian Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChina Academy of Science Laboratory of Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology College of Earth Sciences University of Chinese Academy of Sciences College of Environmental Science and Engineering Ocean University of China
Prevention of annual"green tides"caused by blooms of the green macroalga Ulva prolifera,which have occurred in the Yellow Sea since 2007,has received much *** evidence indicates that micro-propagules on the rafts used... 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
Outage analysis of aerial semi-grant-free NOMA systems
收藏 引用
Digital Communications and Networks 2024年 第5期10卷 1529-1541页
作者: Hongjiang Lei Chen Zhu Ki-Hong Park Imran Shafique Ansari Weijia Lei Hong Tang Kyeong Jin Kim School of Communications and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China Chongqing Key Lab of Mobile Communications Technology Chongqing 400065China CEMSE Division King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia James Watt School of Engineering University of GlasgowGlasgow G128QQUnited Kingdom Samsung Research America(SRA) PlanoTX75023USA
In this paper,we analyze the outage performance of Unmanned Aerial Vehicles(UAVs)-enabled downlink Non-Orthogonal Multiple Access(NOMA)communication systems with the Semi-grant-Free(SGF)transmission scheme.A UAV provi... 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
Activity Detection for Enhanced Configured-grant:A Practical Perspective
收藏 引用
China Communications 2022年 第3期19卷 181-191页
作者: Chenmin Sha Shidong Zhou Department of Electronic Engineering Tsinghua UniversityBeijing 100084China
We try to extend the current configuredgrant(CG)uplink scheme in 5G New Radio(NR)to support massive potential users and study activity detection under this *** of the continuously varying channel and the multiple repe... 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
grant-Free Random Access in Pilot-Reused Multicell Massive MIMO Systems with Backoff Mechanisms
收藏 引用
China Communications 2023年 第9期20卷 185-195页
作者: Qi Zhang Jun Zhang Shi Jin Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing 210003China National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China
grant-free random access(RA)is attractive for future network due to the minimized access *** this paper,we investigate the grantfree RA in multicell massive multiple-input multipleoutput(MIMO)systems with pilot *** ba... 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
Evaluating grant proposals:lessons from using metrics as screening device
收藏 引用
Journal of Data and Information Science 2023年 第2期8卷 66-92页
作者: Katerina Guba Alexey Zheleznov Elena Chechik Center for Institutional Analysis of Science and Education European University at Saint PetersburgGagarinskaya 6/1A Saint Petersburg 191178Russian Federation
Purpose:This study examines the effects of using publication-based metrics for the initial screening in the application process for a project *** key questions are whether formal policy affects the allocation of funds... 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 Joint Activity and Data Detection Scheme for Asynchronous grant-Free Rateless Multiple Access
收藏 引用
China Communications 2024年 第1期21卷 34-52页
作者: Wei Zhang Xiaofeng Zhong Shidong Zhou Department of Electronic Engineering Tsinghua UniversityBeijing 100084China
This paper considers the frameasynchronous grant-free rateless multiple access(FAGF-RMA)scenario,where users can initiate access at any symbol time,using shared channel resources to transmit data to the base *** codin... 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
Achievements and challenges of the World Bank Loan/Department for International Development grant-assisted Tuberculosis Control Project in China
收藏 引用
Chinese Medical Journal 2011年 第14期000卷 2216-2218页
作者: KONG Peng JIANG Xu ZHANG Ben JIANG Shi-wen LIU Bo Center for Health Management and Policy Shandong UniversityJinan Shandong 250012 China Department of Foreign Language Shandong Jiaotong UniversityJinan Shandong 250014 China Foreign Loan Office Ministry of Health Beijing 100009 China National Tuberculosis Center Chinese Center for DiseasePrevention and Control Beijing 100050 China
In March 2002,the government of China launched the World Bank Loan/ Department for International Development-supported Tuberculosis (TB) Control Project to reduce the prevalence and mortality of TB. The project gene... 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
Pilot Domain NOMA for grant-Free Massive Random Access in Massive MIMO Marine Communication System
收藏 引用
China Communications 2020年 第6期17卷 131-144页
作者: Yongxin Liu Ming Zhao Limin Xiao Shidong Zhou Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Tsinghua National Laboratory for Information Science and Technology Tsinghua UniversityBeijing 100084China
We propose a pilot domain non-orthogonal multiple access(NOMA)for uplink massive devices grant-free random access scenarios in massive multiple-input multiple-output(MIMO)maritime communication *** scenarios are chara... 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
the 973 Program of China(Nos.2013CB632704 and 2013CB922404);the Knowledge Innovation Program of the Chinese Academy of Sciences(***2-EW-W02);the National Natural Science Foundation of China under grant Nos.11104342 and 61265010.
收藏 引用
Photonics Research 2013年 第1期1卷 47-51页
作者: K.D.Leake A.R.Hawkins H.Schmidt School of Engineering University of California Santa Cruz1156 High StreetSanta CruzCalifornia 95064USA Electrical and Computer Engineering Department Brigham Young UniversityProvoUtah 84602USA
We analyze the properties of a dual-beam trap of orthogonally intersecting beams in the geometrical optics *** derive analytical expressions for the trapping location and stability criteria for trapping a microparticl... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
Active User and Data Detection for Uplink grant-free NOMA Systems
收藏 引用
China Communications 2020年 第11期17卷 12-28页
作者: Donghong Cai Jinming Wen Pingzhi Fan Yanqing Xu Lisu Yu The College of Cyber Security Jinan UniversityGuangzhou 510632China The Institute of Mobile Communications Southwest Jiaotong UniversityChengdu 610031China The State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China The School of Information Engineering Nanchang UniversityNanchang 330031China
This paper proposes some low complexity algorithms for active user detection(AUD),channel estimation(CE)and multi-user detection(MUD)in uplink non-orthogonal multiple access(NOMA)systems,including single-carrier and 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