中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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浏览/检索结果: 共7条,第1-7条 帮助

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Temporal variations and potential sources of organophosphate esters in PM2.5 in Xinxiang, North China 期刊论文  OAI收割
CHEMOSPHERE, 2019, 卷号: 215, 页码: 500-506
作者:  
Yang, Kong;  Li, Qilu;  Yuan, Meng;  Guo, Mengran;  Wang, Yanqiang
  |  收藏  |  浏览/下载:10/0  |  提交时间:2020/07/08
Mineral and trace element analysis in dustfall collected in the Hexi Corridor and its significance as an indicator of environmental changes 期刊论文  iSwitch采集
ENVIRONMENTAL EARTH SCIENCES, 2010, 卷号: 60, 期号: 1, 页码: 1-10
作者:  
Wang, Xunming;  Huang, Ning;  Dong, Zhibao;  Zhang, Caixia
收藏  |  浏览/下载:42/0  |  提交时间:2019/10/08
Tectonic Evolution and Hydrocarbon Potential in Northern Area of the South Yellow Sea 期刊论文  OAI收割
JOURNAL OF EARTH SCIENCE, 2010, 卷号: 21, 期号: 1, 页码: 71-82
作者:  
Yao Yongjian;  Chen Chunfeng;  Feng Zhiqiang;  Zhang Shiying;  Hao Tianyao
  |  收藏  |  浏览/下载:26/0  |  提交时间:2018/09/26
Tectonic Evolution and Hydrocarbon Potential in Northern Area of the South Yellow Sea 期刊论文  OAI收割
JOURNAL OF EARTH SCIENCE, 2010, 卷号: 21, 期号: 1, 页码: 71-82
作者:  
Yao Yongjian;  Chen Chunfeng;  Feng Zhiqiang;  Zhang Shiying;  Hao Tianyao
  |  收藏  |  浏览/下载:20/0  |  提交时间:2018/09/26
Characterization of the composition of dust fallout and identification of dust sources in arid and semiarid North China 期刊论文  iSwitch采集
GEOMORPHOLOGY, 2009, 卷号: 112, 期号: 1-2, 页码: 144-157
作者:  
Wang, Xunming;  Dong, Zhibao;  Zhang, Caixia;  Qian, Guangqiang;  Luo, Wanyin
收藏  |  浏览/下载:20/0  |  提交时间:2019/10/08
Multi-source remote sensing supported large scale fully distributed hydrological modelling of the tarim river basin in central asia 会议论文  OAI收割
Proceedings of SPIE - The International Society for Optical Engineering, Second International Conference on Earth Observation for Global Changes, Chengdu, China, 2009
Feng; Xianwei1; 2; Chen; Xi1; Willems; Patrick3; Liu; Tie3; Li; Lanhai1; Bao; Anming1; Huang; Yue1
收藏  |  浏览/下载:24/0  |  提交时间:2011/08/23
The synthesis and field emission property of carbon nanotubes on carbon fibers substrate (EI CONFERENCE) 会议论文  OAI收割
Technical Digest of the 20th International Vacuum Nanoelectronics Conference, IVNC 07, July 8, 2008 - July 12, 2008, Chicago, IL, United states
Leyong Z.; Weibiao W.; Jingqiu L.; Yuxue X.; Da L.; Song C.; Haifeng Z.
收藏  |  浏览/下载:33/0  |  提交时间:2013/03/25
Using ferrocene as catalyst precursor  C2H2 as carbon source  carbon nanotubes (CNTs) with uniform density were synthesized on carbon fibers substrate by floating catalyst method. The morphology and microstructure were characterized by field emission scanning electron microscope (FESEM) and high-resolution transmission electron microscopy (HRTEM). The observation showed that the length of CNTs is about 2 m  the average space between adjacent CNTs is about 300 nm and the diameter of CNT is about 45 nm. The less dense "short and stubby" aligned CNTs films should have good electron field emission characteristics. The results of field emission showed that the emission current of CNTs/carbon fibers was 5 A at the field of 2.5 V/m  and the emission current can be 280 A with a field of 7 V/m (the specimen area is 0.25 cm2 and the distance between cathode and anode is 200 m). The calculation based on the F-N plot indicated that the field enhancement factor of CNTs tip is 499122. Using the conductivity and chemical stability of carbon fibers and the uniform and sparse density distribution of CNTs on carbon fibers substrate  the tip predominance of carbon nanotubes can be exerted  and simultaneously the effect of screening effects between adjacent carbon nanotubes on the field emission performance can also be effectively decreased. The CNTs synthesized on carbon fibers substrate has many predominances for the fabrication of cold cathode devices. For example  using the removability of carbon fibers  the cathode of CNTs/carbon fibers can be arbitrarily moved  enlaced or combined to form different patterns  and the cathode of CNTs/carbon fibers can be also fabricated in large size. Therefore  CNTs/carbon fibers may have potential application in field emission displays.