咨询与建议

限定检索结果

文献类型

  • 11,359 篇 期刊文献
  • 6,749 篇 学位论文
  • 472 篇 会议
  • 45 册 图书
  • 5 篇 科技报告
  • 4 篇 成果
  • 3 件 标准

馆藏范围

  • 18,618 篇 电子文献
  • 19 种 纸本馆藏

日期分布

学科分类号

  • 4,843 篇 工学
    • 1,670 篇 材料科学与工程(可...
    • 791 篇 计算机科学与技术...
    • 600 篇 软件工程
    • 589 篇 化学工程与技术
    • 443 篇 电气工程
    • 360 篇 环境科学与工程(可...
    • 301 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...
  • 4,665 篇 理学
    • 3,126 篇 生物学
    • 844 篇 化学
    • 523 篇 物理学
    • 147 篇 数学
    • 126 篇 生态学
    • 111 篇 地球物理学
  • 3,644 篇 医学
    • 2,061 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
  • 413 篇 管理学
    • 276 篇 管理科学与工程(可...
  • 202 篇 教育学
    • 122 篇 教育学
  • 200 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

  • 18,637 篇 c
  • 7,341 篇 a
  • 7,244 篇 n
  • 6,963 篇 e
  • 6,809 篇 i
  • 6,805 篇 s
  • 6,759 篇 o
  • 6,529 篇 l
  • 5,913 篇 ,
  • 5,844 篇 t
  • 5,453 篇 r
  • 4,633 篇 d
  • 4,146 篇 m
  • 3,748 篇 u
  • 3,633 篇 p
  • 3,433 篇 g
  • 3,367 篇 h
  • 2,515 篇 b
  • 2,286 篇 y
  • 2,034 篇 v

机构

  • 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...
  • 61 篇 university of ke...
  • 61 篇 the university o...
  • 58 篇 university of mi...
  • 58 篇 the university o...
  • 55 篇 university of so...

作者

  • 34 篇 chopin j
  • 18 篇 markham kr
  • 16 篇 bouillant ml
  • 15 篇 besson e
  • 13 篇 li yang
  • 13 篇 wang dayong
  • 12 篇 li hejun
  • 12 篇 zhang yulei
  • 11 篇 li longbiao
  • 10 篇 erman je
  • 10 篇 li li
  • 10 篇 liu yang
  • 10 篇 mabry tj
  • 9 篇 wang jing
  • 9 篇 yang yang
  • 8 篇 shingo nakamoto
  • 8 篇 nicola coppola
  • 8 篇 cheng laifei
  • 8 篇 yu ca
  • 8 篇 esmann m

语言

  • 13,859 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""
18637 条 记 录,以下是221-230 订阅
排序:
Effect of c/N ration on disposal of pig carcass by co-composting with swine manure: experiment at laboratory scale
收藏 引用
ENVIRONMENTAL TEcHNOLOGY 2021年 第28期42卷 4415-4425页
作者: chen, Yan Li, Xiaoyu Li, Shuying Xu, Yongping Dalian Univ Technol Sch Bioengn Dalian 116024 Liaoning Peoples R China Minist Educ Ctr Food Safety Anim Origin Dalian 116620 Peoples R China Dalian SEM Bioengn Technol Co Ltd Dalian 116620 Peoples R China
Disposal of animal carcasses by co-composting with animal waste usually selected conventional carbon to nitrogen (c/N) ratio around 25:1, in which the compost is widely used throughout the world. In this study, the pi... 详细信息
来源: 评论
The effect of carbon source addition order during sol-gel process on the properties of c/c-Zrc-Sic composites
收藏 引用
cERAMIcS INTERNATIONAL 2021年 第24期47卷 35366-35377页
作者: Zeng, chen Zhang, Mingyu He, Hanwei Wang, Xiaodong Tong, Kai Wang, Yafeng Xu, Ping Zheng, Lei Zeng, Guang Su, Zhean Huang, Qizhong Cent South Univ Powder Met Res Inst Natl Key Lab Sci & Technol High Strength Struct M Changsha 410083 Peoples R China Cent South Univ Powder Met Res Inst Changsha 410083 Peoples R China
Sol-gel is a promising technology to prepare the c/c-Zrc-Sic composites. However, carbon fiber erosion caused by carbothermal reduction severely degrades properties of the composites. At present study, the addition or... 详细信息
来源: 评论
基于RuO2/TiO2-Ti3c2Tx碱性氢氧化催化剂的构建及高cO耐受性
收藏 引用
复合材料学报 2025年
作者: 方思涛 刘娟娟 杜子富 谢小米 李楠 李左思 李瑞 高楼军 简选 延安大学化学与化工学院 太原理工大学环境科学与工程学院
碱性介质中较慢的氢氧化反应(Hydrogen oxide reaction, HOR)动力学极大地制约了氢氧燃料电池的发展。因此,开发高性能碱性HOR催化剂成为当前的主要任务。本文以二维Ti3c2TxMXene作为催化载体,通过水热法一步合成RuO2/TiO2-Ti3c2T... 详细信息
来源: 评论
Preparation and ablation properties of Sic nanowire-reinforced Zrc-Sic coating-matrix integrated c/c composites
收藏 引用
cERAMIcS INTERNATIONAL 2021年 第22期47卷 31251-31258页
作者: Tian, Xinfa Shi, Xiaohong Yang, Li Li, Hejun Lin, Hongjiao Northwestern Polytech Univ Carbon Carbon Composites Res Ctr State Key Lab Solidificat Proc Xian Peoples R China Northwestern Polytech Univ Sch Mech Civil Engn & Architecture Xian Peoples R China
A modification of the precursor infiltration pyrolysis (PIP) method was explored to prepare the integrated doped ceramic matrix and coating by the added Sic nanowires layer and shape-stabilization process. The epitaxi... 详细信息
来源: 评论
Effect of well-designed graphene heat conductive channel on the thermal conductivity of c/Sic composites
收藏 引用
cERAMIcS INTERNATIONAL 2021年 第13期47卷 19115-19122页
作者: Zhang, Yunhai Liu, Yongsheng cao, Yejie cao, Liyang Zheng, Xutong Wang, Jing Pan, Yu Wang, Ning Northwestern Polytech Univ Sci & Technol Thermostruct Composite Mat Lab Xian 710072 Shaanxi Peoples R China Natl Univ Def Technol Coll Aerosp Sci & Engn Sci & Technol Scramjet Lab Changsha 410073 Hunan Peoples R China
Poor thermal conductivity, especially in thickness direction, is a major obstacle to extend the service lifetime of c/Sic composite. However, there are few papers focusing on finely designing heat conductive channel b... 详细信息
来源: 评论
Mechanical property and toughening mechanism of 2.5D c/c-Sic composites with high textured pyrocarbon interface
收藏 引用
cERAMIcS INTERNATIONAL 2021年 第20期47卷 29183-29190页
作者: Xu, Jing Guo, Lingjun Wang, Hanhui Li, Kaijiao Wang, Tiyuan Li, Wei Northwestern Polytech Univ Carbon Carbon Composites Res Ctr State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China
The application of c/c-Sic composites remains a challenge because of the poor mechanical properties induced by the liquid silicon infiltration method. In this study, a thick high textured pyrolytic carbon (HT Pyc) int... 详细信息
来源: 评论
Effect of a Ti plus c Granule Size on combustion in a Nitrogen Flow
收藏 引用
cOMBUSTION EXPLOSION AND SHOcK WAVES 2021年 第1期57卷 60-66页
作者: Seplyarskii, B. S. Kochetkov, R. A. Lisina, T. G. Abzalov, N. I. Russian Acad Sci Merzhanov Inst Struct Macrokinet & Mat Sci Chernogolovka 142432 Russia
Dependence of the combustion of a Ti + c granular charge on a granule size is experimentally studied. It is revealed that the burning rate of a granular mixture of all fractions used in the work is higher than the bur... 详细信息
来源: 评论
One-step combustion synthesis of c/MgO composite powders with MgO nanofibers
收藏 引用
cERAMIcS INTERNATIONAL 2021年 第10期47卷 13704-13714页
作者: Li, Kaidi Xiao, Guoqing Ding, Donghai chong, Xiaochuan Luo, Jiyuan chen, Xing Bai, Bing Ren, Yun Xian Univ Architecture & Technol Coll Mat Sci & Engn Xian 710055 Peoples R China
c/MgO composite powders were prepared by combustion synthesis using magnesium oxalate and magnesium powders as raw materials. The phase composition and microstructure of the composite powders were investigated by X-ra... 详细信息
来源: 评论
characterization and modeling of tensile properties of continuous fiber reinforced c/c-Sic composite at high temperatures
收藏 引用
JOURNAL OF THE EUROPEAN cERAMIc SOcIETY 2021年 第5期41卷 3061-3071页
作者: Shi, Yuan Kessel, Fiona Friess, Martin Jain, Neraj Tushtev, Kamen German Aerosp Ctr Stuttgart Inst Struct & Design Pfaffenwaldring 38-40 D-70569 Stuttgart Germany Univ Bremen Adv Ceram Biol Garten 2 D-28359 Bremen Germany
In order to study the effects of temperature on the material behavior of Liquid Silicon Infiltration (LSI) based continuous carbon fiber reinforced silicon carbide (c/c-Sic), the mechanical properties at room temperat... 详细信息
来源: 评论
Preparation and mechanical properties of c/c composites reinforced with arrayed Sic columnar pins
收藏 引用
cERAMIcS INTERNATIONAL 2021年 第17期47卷 24262-24269页
作者: Jia, Jiangang Ju, Jiakang Liu, Shunwei Ji, Genshun State Key Lab Adv Proc & Recycling Nonferrous Met Lanzhou Peoples R China Lanzhou Univ Technol Sch Mat Sci & Engn Lanzhou 730050 Peoples R China
c/c composites with Sic columnar pins were fabricated by a recently developed space-holder method. Effects of Sic columnar pins with pins-row spacing of 5 mm and 4 mm on mechanical properties and toughening of c/c com... 详细信息
来源: 评论