机构

• 成都山地灾害与环境研... [1]
• 长春光学精密机械与物... [1]
• 寒区旱区环境与工程研... [1]
• 水生生物研究所 [1]
• 生态环境研究中心 [1]

采集方式

• OAI收割 [4]
• iSwitch采集 [1]

内容类型

• 期刊论文 [4]
• 会议论文 [1]

发表日期

• 2020 [1]
• 2016 [2]
• 2015 [1]
• 2010 [1]

学科主题

筛选

浏览/检索结果: 共5条，第1-5条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 The importance of natural versus human factors for ecological conditions of streams and rivers 期刊论文  OAI收割 SCIENCE OF THE TOTAL ENVIRONMENT, 2020, 卷号: 704, 期号: 1, 页码: 13 作者:  Tang, Tao;  Stevenson, R. Jan;  Grace, James B.   |  收藏  |  浏览/下载：22/0  |  提交时间：2020/05/07 Covarying effects  Structural equation modeling  Macro-variables  Composite variable  In-stream environment  Biological condition   Influence of oxic/anoxic condition on sorption behavior of PFOS in sediment 期刊论文  OAI收割 CHEMOSPHERE, 2016, 卷号: 150, 期号: 0, 页码: 798-803 作者:  Ololade, Isaac Ayodele;  Zhou, Qin;  Pan, Gang 收藏  |  浏览/下载：21/0  |  提交时间：2017/03/28 Sediment components  Oxic condition  Anoxic environment  PFOS  Sorption   Climatic characteristics of thunderstorm days and the influence of atmospheric environment in Northwestern China 期刊论文  iSwitch采集 NATURAL HAZARDS, 2016, 卷号: 80, 期号: 2, 页码: 823-838 作者:  Yu, Ye;  Li, Jiang-lin;  Xie, Jin;  Liu, Chuan 收藏  |  浏览/下载：29/0  |  提交时间：2019/10/09 Northwestern China  Thunderstorm days  Water vapor flux  Environment condition   Debris flow formation process and critical hydrodynamic conditions in the meizoseismal area of the Wenchuan earthquake 期刊论文  OAI收割 JOURNAL OF MOUNTAIN SCIENCE, 2015, 卷号: 12, 期号: 3, 页码: 699-710 作者:  Wang Jun;  Yu Yan;  Pan Hua-li;  Qiao Cheng;  Ou Guo-qiang 收藏  |  浏览/下载：44/0  |  提交时间：2015/06/01 Wenchuan Earthquake  Debris flow  Disaster-prone environment  Permeability characteristics  Hydrodynamic condition   Inspection focus technology of space tridimensional mapping camera based on astigmatic method (EI CONFERENCE) 会议论文  OAI收割 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, April 26, 2010 - April 29, 2010, Dalian, China 作者:  Wang Z.;  Wang Z.;  Zhang L.;  Zhang L. 收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25 The CCD plane of the space tridimensional mapping camera will be deviated from the focal plane(including the CCD plane deviated due to camera focal length changed)  under the condition of space environment and vibration  impact when satellite is launching  image resolution ratio will be descended because defocusing. For tridimensional mapping camera  principal point position and focal length variation of the camera affect positioning accuracy of ground target  conventional solution is under the condition of vacuum and focusing range  calibrate the position of CCD plane with code of photoelectric encoder  when the camera defocusing in orbit  the magnitude and direction of defocusing amount are obtained by photoelectric encoder  then the focusing mechanism driven by step motor to compensate defocusing amount of the CCD plane. For tridimensional mapping camera  under the condition of space environment and vibration  impact when satellite is launching  if the camera focal length changes  above focusing method has been meaningless. Thus  the measuring and focusing method was put forward based on astigmation  a quadrant detector was adopted to measure the astigmation caused by the deviation of the CCD plane  refer to calibrated relation between the CCD plane poison and the asrigmation  the deviation vector of the CCD plane can be obtained. This method includes all factors caused deviation of the CCD plane  experimental results show that the focusing resolution of mapping camera focusing mechanism based on astigmatic method can reach 0.25 m. 2010 Copyright SPIE - The International Society for Optical Engineering.