咨询与建议

限定检索结果

文献类型

  • 11,364 篇 期刊文献
  • 6,914 篇 学位论文
  • 472 篇 会议
  • 46 册 图书
  • 5 篇 科技报告
  • 4 篇 成果
  • 3 件 标准

馆藏范围

  • 18,788 篇 电子文献
  • 20 种 纸本馆藏

日期分布

学科分类号

  • 4,848 篇 工学
    • 1,671 篇 材料科学与工程(可...
    • 792 篇 计算机科学与技术...
    • 600 篇 软件工程
    • 591 篇 化学工程与技术
    • 443 篇 电气工程
    • 360 篇 环境科学与工程(可...
    • 302 篇 冶金工程
    • 293 篇 机械工程
    • 236 篇 生物工程
    • 198 篇 电子科学与技术(可...
    • 154 篇 仪器科学与技术
    • 150 篇 信息与通信工程
    • 123 篇 生物医学工程(可授...
  • 4,669 篇 理学
    • 3,127 篇 生物学
    • 845 篇 化学
    • 524 篇 物理学
    • 148 篇 数学
    • 126 篇 生态学
    • 111 篇 地球物理学
  • 3,642 篇 医学
    • 2,059 篇 临床医学
    • 1,010 篇 基础医学(可授医学...
    • 485 篇 药学(可授医学、理...
    • 447 篇 公共卫生与预防医...
    • 220 篇 中西医结合
    • 138 篇 医学技术(可授医学...
  • 967 篇 农学
    • 274 篇 作物学
    • 130 篇 农业资源与环境
  • 412 篇 管理学
    • 276 篇 管理科学与工程(可...
  • 202 篇 教育学
    • 122 篇 教育学
  • 199 篇 经济学
    • 139 篇 应用经济学
  • 127 篇 法学
  • 82 篇 文学
  • 47 篇 历史学
  • 44 篇 哲学
  • 40 篇 艺术学
  • 2 篇 军事学

主题

  • 18,808 篇 c
  • 7,359 篇 a
  • 7,264 篇 n
  • 6,981 篇 e
  • 6,828 篇 i
  • 6,824 篇 s
  • 6,779 篇 o
  • 6,548 篇 l
  • 5,917 篇 ,
  • 5,848 篇 t
  • 5,455 篇 r
  • 4,634 篇 d
  • 4,148 篇 m
  • 3,749 篇 u
  • 3,634 篇 p
  • 3,433 篇 g
  • 3,369 篇 h
  • 2,517 篇 b
  • 2,286 篇 y
  • 2,034 篇 v

机构

  • 147 篇 brno university ...
  • 136 篇 university of ca...
  • 117 篇 harvard universi...
  • 112 篇 state university...
  • 106 篇 the university o...
  • 96 篇 capella universi...
  • 93 篇 columbia univers...
  • 92 篇 yale university
  • 85 篇 the george washi...
  • 84 篇 university of il...
  • 82 篇 indiana universi...
  • 75 篇 university of ph...
  • 69 篇 princeton univer...
  • 68 篇 the university o...
  • 67 篇 ohio state unive...
  • 67 篇 university of ca...
  • 67 篇 university of ne...
  • 61 篇 university of ke...
  • 61 篇 the university o...
  • 59 篇 the university o...

作者

  • 34 篇 chopin j
  • 18 篇 markham kr
  • 17 篇 li hejun
  • 16 篇 bouillant ml
  • 15 篇 li yang
  • 15 篇 besson e
  • 14 篇 wang jing
  • 14 篇 li li
  • 14 篇 liu yang
  • 13 篇 wang dayong
  • 12 篇 cheng laifei
  • 11 篇 li longbiao
  • 11 篇 wang jian
  • 11 篇 zhang yulei
  • 10 篇 erman je
  • 10 篇 wang qing
  • 10 篇 liu lei
  • 10 篇 zhang yan
  • 10 篇 mabry tj
  • 9 篇 zhang lei

语言

  • 14,031 篇 英文
  • 2,852 篇 中文
  • 1,874 篇 其他
  • 18 篇 荷兰文
  • 14 篇 法文
  • 13 篇 德文
  • 8 篇 日文
  • 5 篇 西班牙文
  • 3 篇 俄文
  • 1 篇 波兰文
  • 1 篇 塞尔维亚文
  • 1 篇 土耳其文
检索条件""
18808 条 记 录,以下是271-280 订阅
排序:
High-T-c SQUIDs
收藏 引用
cURRENT OPINION IN SOLID STATE & MATERIALS ScIENcE 1997年 第1期2卷 3-10页
作者: clarke, J LAWRENCE BERKELEY NATL LAB DIV SCI MAT BERKELEY CA 94720 USA
Magnetometers based on superconducting quantum interference devices (SQUIDs), fabricated from thin films of YBa2cu3O7-x and operated in liquid nitrogen at 77K, have achieved a magnetic field noise below 10 fT Hz(-1/2)... 详细信息
来源: 评论
Design and sustainable production of natural carbon incorporated cuO/c nanocomposite using cyperus rotundus biomass
收藏 引用
BIOMASS cONVERSION AND BIOREFINERY 2023年 第20期14卷 25223-25237页
作者: Priya, D. Devi Surendra, T. V. Shajahan, Shanavas Muthuraja, S. Roopan, Selvaraj Mohana Vellore Inst Technol Sch Adv Sci Dept Chem Vellore 632014 Tamil Nadu India Chaitanya Bharathi Inst Technol A Dept Chem Hyderabad 500090 Telangana India Khalifa Univ Dept Chem POB 127788 Abu Dhabi U Arab Emirates Vellore Inst Technol Sch Elect Engn Dept Sensor & Biomed Technol Vellore 632014 Tamil Nadu India Vellore Inst Technol Sch Adv Sci Dept Chem Chem Heterocycles & Nat Prod Res Lab Vellore 632014 Tamil Nadu India
The synthesis of cuO/c nanocomposites was fabricated using an uncomplicated and eco-friendly method by cyperus rotundus (c. rotundus) leaf extract. The formation of nanocomposites and their size were optimized with va... 详细信息
来源: 评论
Influence of methyl-modified silyl groups on the properties of polymers and Si/B/N/c ceramics derived from N-silylated borazine derivatives
收藏 引用
APPLIED ORGANOMETALLIc cHEMISTRY 2012年 第9期26卷 483-492页
作者: Schurz, Fanny Jansen, Martin Max Planck Inst Solid State Res D-70569 Stuttgart Germany
Thermal silazane cleavage of dichloroboryldisilylamines (SiclmMe3-m)N(SiMe3)(Bcl2) (1: m?=?1;2: m?=?2) at 196 degrees c leads to the borazine derivates [(SiclmMe3-m)NB(clnMe1-n)]3 (3: m?=?1, n?=?0.185;4: m?=?2, n?=?0.... 详细信息
来源: 评论
Ablation behaviors of Sic nanowire-reinforced Zrc-Sic coating-matrix integrated c/c composites with different ratios of precursors
收藏 引用
JOURNAL OF THE EUROPEAN cERAMIc SOcIETY 2022年 第15期42卷 6774-6784页
作者: Tian, Xinfa Yang, Li Li, Bo Li, Hejun Shi, Xiaohong Lin, Hongjiao Northwestern Polytech Univ Shaanxi Prov Key Lab Fiber Reinforced Light Compos Xian 710072 Shaanxi Peoples R China Northwestern Polytech Univ Sch Mech Civil Engn & Architecture Xian Peoples R China
A novel method to prepare a coating on the c/c composite is discussed. The precursor infiltration pyrolysis method is usually applied to prepare interior ceramic matrix, thus Sic nanowires that can absorb the surficia... 详细信息
来源: 评论
Optimized ablation resistance behavior and mechanism of c/Sic composites with high thermal conductive channels
收藏 引用
JOURNAL OF THE AMERIcAN cERAMIc SOcIETY 2023年 第11期106卷 6937-6950页
作者: cao, Yejie Zhang, Yunhai Liu, Yongsheng cao, Liyang Shao, Xiongjian Wang, Jing Northwestern Polytech Univ Sci & Technol Thermostructural Composites Mat Lab Xian Shaanxi Peoples R China Natl Univ Def Technol Sci & Technol Adv Ceram Fibers & Composites Lab Changsha Hunan Peoples R China China Acad Launch Vehicle Technol Beijing Inst Astronaut Syst Engn Beijing Peoples R China
Aimed to enhance the high-temperature service performance of c/Sic composites in high-speed aircraft thermal protection system, in this article, pitch-based carbon fibers were used to construct high thermal conductive... 详细信息
来源: 评论
Ablation behavior of c/c-Zr1-xHfxc-Sic composites under an oxyacetylene flame at above 2500 °c
收藏 引用
JOURNAL OF MATERIALS RESEARcH AND TEcHNOLOGY-JMR&T 2023年 24卷 3235-3251页
作者: Jiao, Xiaoyang He, Qinchuan Qing, Mingcong Wang, Yiqun Yin, Xuemin Chengdu Univ Technol Coll Mat & Chem & Chem Engn Chengdu 610059 Peoples R China Northwestern Polytech Univ Sch Mat Sci & Engn Xian 710072 Peoples R China
In order to enhance ablation resistance of c/c composites, Zr1-xHfxc and Sic were intro-duced into c/c composites, and ablation behavior of the composites was studied. In the composites (cHZS), Hfc and Zrc produced a ... 详细信息
来源: 评论
An Ultrathin Microwave Metamaterial Absorber for c, X, and Ku Band Applications
收藏 引用
JOURNAL OF ELEcTRONIc MATERIALS 2021年 第12期50卷 7275-7282页
作者: Elakkiya, A. Radha, S. Sreeja, B. S. Manikandan, E. Sri Sivasubramaniya Nadar Coll Engn Dept ECE Chennai 603110 Tamil Nadu India VIT Univ Sch SENSE Dept ECE Chennai Campus Chennai 600127 Tamil Nadu India
A five-band polarization-insensitive microwave metamaterial absorber (MMA) is discussed in this paper. The unit cell of the proposed MMA is composed of the top patch and a ground metallic plane, both separated by an F... 详细信息
来源: 评论
Histone Deacetylase 3 Inhibitor Suppresses Hepatitis c Virus Replication by Regulating Apo-A1 and LEAP-1 Expression
收藏 引用
Virologica Sinica 2018年 第5期33卷 418-428页
作者: Yuan Zhou Qian Wang Qi Yang Jielin Tang chonghui Xu Dongwei Gai Xinwen chen Jizheng chen State Key Laboratory of Virology Wuhan Institute of VirologyChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100101China Jiangsu Province Key Laboratory of Human Functional Genomies Department of Biochemistry and Molecular BiologyNanjing Medical UniversityNanjing 210029China
Histone deacetylase (HDAc) inhibitors show clinical promise for the treatment of cancers, including hepatocellular carcinoma (Hcc). In this study, we investigated the effect of HDAc inhibitor treatment on hepatitis c ... 详细信息
来源: 评论
A Dual Protection System for Heterostructured 3D cNT/coSe2/c as High Areal capacity Anode for Sodium Storage
收藏 引用
ADVANcED ScIENcE 2020年 第5期7卷 1902907页
作者: Yousaf, Muhammad chen, Yijun Tabassum, Hassina Wang, Zhipeng Wang, Yunsong Abid, Adeel Y. Mahmood, Asif Mahmood, Nasir Guo, Shaojun Han, Ray P. S. Gao, Peng Peking Univ Dept Mat Sci & Engn Beijing 100871 Peoples R China Peking Univ Sch Phys Int Ctr Quantum Mat Beijing 100871 Peoples R China Peking Univ Electron Microscopy Lab Beijing 100871 Peoples R China Univ Sydney Sch Chem & Biomol Engn Sydney NSW 2006 Australia RMIT Univ Sch Engn 124 La Trobe St Melbourne Vic 3001 Australia
3D electrode design is normally opted for multiple advantages, however, instability/detachment of active material causes the pulverization and degradation of the structure, and ultimately poor cyclic stability. Here, ... 详细信息
来源: 评论
Rh-catalyzed Intramolecular Hydroarylation of Unactivated Alkenes via c-c Bond Activation
收藏 引用
AcS cATALYSIS 2023年 第7期13卷 4362-4368页
作者: cheng, Lang Tang, Qi Dai, Ya-Mei Wang, Bi-Qin Hu, Ping cao, Peng Song, Feijie Sichuan Normal Univ Coll Chem & Mat Sci Chengdu 610066 Sichuan Peoples R China
The transition-metal-catalyzed intramolecular hydroarylation of alkenes has been recognized as a straightforward approach for the construction of 3,3-disubstituted 2,3-dihydrobenzofurans. The reactions mainly rely on ... 详细信息
来源: 评论