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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Influence of Component Size on the Corrosion Behavior of Ti6Al4V Alloy Fabricated by Electron Beam Powder Bed Fusion 期刊论文  OAI收割
ACTA METALLURGICA SINICA-ENGLISH LETTERS, 2023, 页码: 10
作者:  
Zheng, Hongyu;  Gai, Xin;  Bai, Yun;  Hou, Wentao;  Li, Shujun
  |  收藏  |  浏览/下载:19/0  |  提交时间:2024/01/07
Evaluation of trace elements and identification of pollution sources in particle size fractions of soil from iron ore areas along the Chao River 期刊论文  OAI收割
Journal of Geochemical Exploration, 2014, 卷号: 138, 期号: 1, 页码: 33-49
Fei Qin; Hongbing Ji; Qian Li; Xinyue Guo; Lei Tang; Jinguo Feng
收藏  |  浏览/下载:33/0  |  提交时间:2016/01/08
Distinguishing aeolian signature from lacustrine sediments of the Qaidam Basin in northeastern Qinghai-Tibetan Plateau and its palaeoclimatic implications 期刊论文  OAI收割
AEOLIAN RESEARCH, 2012, 卷号: 4, 页码: 17-30
作者:  
An, FuYuan;  Ma, HaiZhou;  Wei, HaiCheng;  Lai, ZhongPing
  |  收藏  |  浏览/下载:54/0  |  提交时间:2018/06/20
Miniaturize photoelectric stable platform (EI CONFERENCE) 会议论文  OAI收割
2010 International Conference on Computer Application and System Modeling, ICCASM 2010, October 22, 2010 - October 24, 2010, Shanxi, Taiyuan, China
Xue W.-Q.; Wang Y.-Y.; Dai M.
收藏  |  浏览/下载:79/0  |  提交时间:2013/03/25
In order to reduce the size and weight of the gimbal in a traditional stable platform and correct the disadvantage in size of the payload  the paper first improves the gimbal which is an important component of a stable photoelectric platform  that also is an important factor in affecting the size and weight of a stability platform. In this paper  a closed-form solution of 3-DOF manipulator is designed according mechanical arm design principles. This manipulator is formed by a three joint axes whose extended line is intersected at one point. A standard orthogonal coordinate system is set up for each rod in the manipulator. And then  rotation transformation matrix expression is obtained. At last in this paper  the manipulator arm-shaped method for solving solutions is description  and also  each parameter of the gimbal is calculated when the photoelectric detection devices at bottom reach the expected position. Test results show that the photoelectric stability platform with gimbal we designed is smaller  lighter and simpler than that traditional. Also  the packaging and size of the photoelectric will not be affected with this open structure. 2010 IEEE.  
Soybean yield and yield component distribution across the main axis in response to light enrichment and shading under different densities 期刊论文  iSwitch采集
Plant soil and environment, 2010, 卷号: 56, 期号: 8, 页码: 384-392
作者:  
Liu, B.;  Liu, X. B.;  Wang, C.;  Li, Y. S.;  Jin, J.
收藏  |  浏览/下载:35/0  |  提交时间:2019/05/10
An improved two-dimensional entropy method for star trail tracing in deep sky (EI CONFERENCE) 会议论文  OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者:  
Wang Y.-J.;  Yao Z.-J.
收藏  |  浏览/下载:32/0  |  提交时间:2013/03/25
The trace of star trail is an important component of deep sky detection. The stars are low contrast targets  and their self-rotation will make their brightness change in cycle. Above all  the trail trace is vulnerable to the block and disturbance of other stars. Traditional one-dimensional maximum entropy thresholding algorithm is vulnerable to the noise  and the calculation of two-dimensional entropy methods is too large and takes too much time. This paper proposes an improved two-dimensional entropy threshold algorithm. We use recursion iteration method to eliminate the redundancy calculation  and reduce the size of two-dimensional histogram based on the deep sky stars characteristic  such as low contrast  fuzziness and the centralized histogram. We also combine our algorithm with the space trail trace model to forecast the star trace. Experiments results show  when the star are blocked or they turn dark  the method still can well extrapolate the star trace. Our method improves the capability of trailing the ebb and small star  and increases the precision of tracing. It is also robust to the noise  so there is a good application foreground for the method.  
East Asia Winter Monsoon changes inferred from environmentally sensitive grain-size component records during the last 2300 years in mud area southwest off Cheju Island, ECS 期刊论文  OAI收割
SCIENCE IN CHINA SERIES D-EARTH SCIENCES, 2006, 卷号: 49, 期号: 6, 页码: 604-614
Xiang, R; Yang, ZS; Saito, Y; Guo, ZG; Fan, DJ; Li, YH; Xiao, SB; Shi, XF; Chen, MH
收藏  |  浏览/下载:43/0  |  提交时间:2011/07/03