咨询与建议

限定检索结果

文献类型

  • 48,782 篇 期刊文献
  • 3,371 篇 会议
  • 2,864 册 图书
  • 62 篇 学位论文
  • 22 篇 报纸

馆藏范围

  • 53,815 篇 电子文献
  • 1,338 种 纸本馆藏

日期分布

学科分类号

  • 19,301 篇 工学
    • 3,757 篇 材料科学与工程(可...
    • 2,060 篇 化学工程与技术
    • 2,054 篇 生物医学工程(可授...
    • 1,404 篇 机械工程
    • 1,341 篇 电子科学与技术(可...
    • 1,183 篇 计算机科学与技术...
    • 1,023 篇 地质资源与地质工...
    • 867 篇 仪器科学与技术
    • 845 篇 动力工程及工程热...
    • 713 篇 水利工程
    • 670 篇 光学工程
    • 632 篇 电气工程
  • 17,530 篇 医学
    • 14,419 篇 临床医学
    • 2,215 篇 医学技术(可授医学...
    • 1,535 篇 基础医学(可授医学...
    • 1,353 篇 中西医结合
    • 1,084 篇 公共卫生与预防医...
    • 779 篇 药学(可授医学、理...
  • 8,987 篇 理学
    • 1,656 篇 物理学
    • 1,460 篇 化学
    • 1,448 篇 生物学
    • 1,109 篇 数学
    • 1,106 篇 地质学
  • 4,514 篇 农学
    • 1,129 篇 畜牧学
    • 1,021 篇 作物学
    • 685 篇 农业资源与环境
  • 2,324 篇 管理学
    • 1,116 篇 管理科学与工程(可...
    • 678 篇 公共管理
  • 1,553 篇 经济学
    • 1,364 篇 应用经济学
  • 1,304 篇 教育学
    • 917 篇 教育学
  • 1,034 篇 文学
  • 922 篇 法学
  • 476 篇 艺术学
  • 376 篇 历史学
  • 269 篇 哲学
  • 128 篇 军事学

主题

  • 422 篇 ct
  • 414 篇 美国
  • 349 篇 mri
  • 258 篇 患者
  • 241 篇 病人
  • 198 篇 mr
  • 159 篇 北美洲
  • 118 篇 analysis
  • 115 篇 美利坚合众国
  • 105 篇 covid-19
  • 104 篇 of
  • 101 篇 治疗
  • 81 篇 cancer
  • 76 篇 中国
  • 72 篇 and
  • 69 篇 诊断
  • 66 篇 大洋洲
  • 66 篇 疾病
  • 60 篇 acid
  • 56 篇 发生率

机构

  • 81 篇 同济医科大学附属...
  • 79 篇 中国科学院大学
  • 70 篇 北京大学
  • 68 篇 university of mi...
  • 67 篇 institute for pa...
  • 67 篇 albert einstein ...
  • 67 篇 dipartimento di ...
  • 67 篇 nikhef p.o.box 4...
  • 67 篇 fysikum stockhol...
  • 66 篇 michigan state u...
  • 66 篇 NOT FOUND
  • 64 篇 national researc...
  • 64 篇 institut fur the...
  • 62 篇 dept.of physics ...
  • 62 篇 compas group ins...
  • 60 篇 rudolf peierls c...
  • 59 篇 department of ph...
  • 56 篇 max-planck-insti...
  • 55 篇 nstitucio catala...
  • 53 篇 cern european or...

作者

  • 85 篇 f.krauss
  • 85 篇 g.weiglein
  • 85 篇 h.murayama
  • 85 篇 j.parsons
  • 85 篇 j.d.jackson
  • 85 篇 g.d'ambrosio
  • 85 篇 r.s.chivukula
  • 85 篇 y.kwon
  • 82 篇 m.white
  • 81 篇 叶鹏
  • 79 篇 m.drees
  • 75 篇 kevin d.hyde
  • 71 篇 s.blusk
  • 69 篇 郭战宏
  • 61 篇 k.monig
  • 45 篇 李开
  • 44 篇 阿d
  • 41 篇 中远海运研发
  • 40 篇 郭俊
  • 38 篇 王亭忠

语言

  • 36,633 篇 中文
  • 18,452 篇 英文
  • 2 篇 其他
  • 1 篇 德文
  • 1 篇 日文
检索条件"作者=D.G"
55101 条 记 录,以下是91-100 订阅
排序:
NUMERICAL SIMULATION OF MOLTEN POOL ANd CONTROL STRATEgY OF KISS POINT IN A TWIN-ROLL STRIP CASTINg PROCESS
收藏 引用
Acta Metallurgica Sinica(English Letters) 2008年 第6期21卷 459-468页
作者: g.M. Cao C.g. Li Z. Y. Liu d. Wu g.d. Wang X.H. Liu State Key Laboratory of Rolling & Automation Northeastern University Shenyang 110004 China
Coupled turbulent flow, temperature fields of the twin-roll casting strip process were simulated by three-dimensional finite element method. Based on the heat balance calculation and using inverse methods between the ... 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
grafting affects yield and phenolic prof ile of Solanum melongena L. landraces
收藏 引用
Journal of Integrative Agriculture 2016年 第5期15卷 1017-1024页
作者: L Sabatino g Iapichino A Maggio E d’ Anna M Bruno F d’ Anna department of Agricultural and Forest Sciences University of Palermo department of Biological Chemical and Pharmaceutical Sciences and Technologies University of Palermo Regional Centres for Agricultural Technologies (Ce.R.T.A.) University of Foggia
The influence of grafting on agronomical and qualitative characteristics of four Sicilian eggplant landraces was investigated. grafted and ungrafted plants were compared in the open field in the northern coast of Sici... 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
APPLICATION OF A NOVEL ALgORITHM FOR MOVINg SURFACE FLOWS
收藏 引用
Journal of Hydrodynamics 1997年 第1期9卷 87-95页
作者: Xu Wei-xing, g. d. Raithby, g. d. Stubleydepartment of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, CanadaN2L3g1 Univ of Waterloo Waterloo Canada
Purpose:To demonstrate a novel algorithm for simulating moving surface flows. Methods: A fully conservative control volume method, on an adaptive Eulerian grid, has been developed to guarantee that the 'kinematic free... 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 efficient technique for two-dimensional fractional order biological population model
收藏 引用
International Journal of Modeling, Simulation, and Scientific Computing 2020年 第1期11卷 96-112页
作者: P.Veeresha d.g.Prakasha department of Mathematics Karnatak University Dharwad 580003India department of Mathematics Faculty of Science Davangere University ShivagangothriDavangere 577007India
In this paper,we find the solutions for two-dimensional biological population model having fractional order using fractional natural decomposition method(FNdM).The proposed method is a graceful blend of decomposition ... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
Analysis of Lakes pollution model with Mittag-Leffler kernel
收藏 引用
Journal of Ocean Engineering and Science 2020年 第4期5卷 310-322页
作者: d.g.Prakasha P.Veeresha department of Mathematics Faculty of ScienceDavangere UniversityShivagangothriDavangere-577007KarnatakaIndia department of Mathematics Karnatak UniversityDharwad-580003KarnatakaIndia
The pivotal aim of the present investigation is to find an approximate analytical solution for the system of three fractional differential equations describing the Lakes pollution using q-homotopy analysis transform m... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
EXPERIMENTAL STUdY ON BEd RESISTANCE CHARACTERISTICS OF NONUNIFORM SEdIMENT
收藏 引用
Journal of Hydrodynamics 2000年 第4期12卷 66-74页
作者: Zhou, g.d. Liu, Q.Y. Wang, g.X. Hui, Y.J. Pang, d.M. Tsinghua Univ. Beijing 100084 China
Under natural circumstances, the bed of fluvial river is composed of nonuniform sediment, and its nonuniform property influences very much the bed resistance and flow characteristics. By using a one-dimensional laser ... 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
FRACTAL INVESTIgATION OF THE MICROSTRUCTURE IN Alnico8 THERMOMAgNETICALLY TREATEd
收藏 引用
Acta Metallurgica Sinica(English Letters) 2000年 第4期13卷 932-936页
作者: Fei, W.d. Chu, W.g. Yang, d.Z. Harbin Inst of Technology Harbin China
Fe-Co rich particles in the Alnico8 samples thermomagnetically treated for various times at 800 °C have been found to be of self-similarity and of fractal characteristics both in two-dimensional space and three-dimen... 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
Maternal effects, malaria infections and the badge size of the house sparrow
收藏 引用
Chinese Birds 2015年 第4期6卷 215-224页
作者: Philip L.g.Birget Stephen d.Larcombe St Peter’s College University of Oxford Institute of Evolutionary Biology University of Edinburgh Edward.grey Institute of Field Ornithology University of Oxford Centre de Recherche de la Tour du Valat Jesus College University of Oxford Institute of Biodiversity Animal Health and Comparative Medicine University of Glasgow
Background: The evolution of sexual signals is not only determined by immediate sexual selection but also by selection arising from the environment and the interaction with developmental *** this study we aimed to inv... 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
Optimal Placement and Sizing of distributed.generation Using Metaheuristic Algorithm
收藏 引用
Computer Systems Science & Engineering 2022年 第5期41卷 493-509页
作者: d.Nageswari N.Kalaiarasi g.geethamahalakshmi department of Electrical and Electronics Engineering RMK College of Engineering and Technology(RMKCET)Thiruvallur601206India department of Electrical and Electronics Engineering RMK Engineering CollegeGummidipoondi601206India
Power loss and voltage uncertainty are the major issues prevalently faced in the design of distribution *** such issues can be resolved through effective usage of networking reconfiguration that has a combination of d... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
A Shrinkage Estimator for Combination of Bioassays
收藏 引用
Acta Mathematicae Applicatae Sinica 2007年 第3期23卷 467-476页
作者: Jian Xiong d.g. Chen Zhen-hai Yang College of Applied Sciences Beijing University of Technology Beijing 100022 China School of Mathematics and Information Science Guangzhou University Guangzhou 510006 China department of Mathematics and Statistics South Dakota State University Brookings SD 57007 USA
A shrinkage estimator and a maximum likelihood estimator are proposed in this paper for combination of bioassays. The shrinkage estimator is obtained in closed form which incorporates prior information just on the com... 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