中国科学院机构知识库网格系统: 检索

Study on the variation mechanism of Zn isotope in polluted farmland soil 期刊论文 OAI收割
JOURNAL OF HAZARDOUS MATERIALS, 2024, 卷号: 479, 页码: 135561
作者: Kong, Jing; Huang, Fang; Wei, Rongfei; Zhang, Xingchao; Zhu, Guangxu

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收藏 | 浏览/下载：16/0 | 提交时间：2024/10/21

Zn isotope Agricultural soil Variation mechanism Isotopic tracing

Temporal variation and mechanism of the geogenic arsenic concentrations in global groundwater 期刊论文 OAI收割
APPLIED GEOCHEMISTRY, 2022, 卷号: 146, 页码: 11
作者: Yin, Shuhui; Yang, Linsheng; Wen, Qiqian; Wei, Binggan

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收藏 | 浏览/下载：39/0 | 提交时间：2022/11/29

Groundwater Arsenic Temporal variation Mechanism Surface environment

Spatiotemporal variation characteristics of ecosystem health and its driving mechanism in the mountains of southwest China 期刊论文 OAI收割
JOURNAL OF CLEANER PRODUCTION, 2022, 卷号: 345, 页码: 11
作者: Xiao, Zuolin; Liu, Rui; Gao, Yanghua; Yang, Qingyuan; Chen, Jilong

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收藏 | 浏览/下载：35/0 | 提交时间：2022/08/22

Ecosystem health Spatiotemporal variation Driving mechanism Migrant population

The variation of net primary productivity and underlying mechanisms vary under different drought stress in Central Asia from 1990 to 2020 期刊论文 OAI收割
AGRICULTURAL AND FOREST METEOROLOGY, 2022, 卷号: 314, 页码: 15
作者: Li, Saibo; He, Shaoyang

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收藏 | 浏览/下载：21/0 | 提交时间：2023/02/27

Net primary productivity (NPP) Spatiotemporal variation Driving mechanism Drought stress Central Asia

The variation of net primary productivity and underlying mechanisms vary under different drought stress in Central Asia from 1990 to 2020 期刊论文 OAI收割
AGRICULTURAL AND FOREST METEOROLOGY, 2022, 卷号: 314, 页码: 15
作者: Li, Saibo; He, Shaoyang

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收藏 | 浏览/下载：19/0 | 提交时间：2023/02/27

Net primary productivity (NPP) Spatiotemporal variation Driving mechanism Drought stress Central Asia

不同沙漠生境三种荒漠植物种内种子萌发差异及作用机制 学位论文 OAI收割
北京: 中国科学院大学, 2019
作者: 刘有军

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收藏 | 浏览/下载：89/0 | 提交时间：2021/12/10

种内种子萌发差异荒漠植物变化机制不同沙漠生境种皮纹饰 Intraspecific difference in seed germination desert plant variation mechanism of intraspcific seed germination different desert environments seed coat sculpture

Catalytic properties of different crystal sizes for zsm-5 zeolites on the alkylation of benzene with methanol and optimization of the reaction conditions 期刊论文 iSwitch采集
Acta physico-chimica sinica, 2016, 卷号: 32, 期号: 7, 页码: 1775-1784
作者: Yuan Ping; Wang Hao; Xue Yan-Feng; Li Yan-Chun; Wang Kai

收藏 | 浏览/下载：32/0 | 提交时间：2019/05/09

Benzene alkylation Zsm-5 molecular sieve Variation of crystal size Deactivation mechanism

Experiment analysis of CO2 laser disturbance on long-wave infrared HgCdTe detector (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
作者: Wang S.-W.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

Theoretical analysis and experimental study were carried out on the high-power CO2 laser disturbance to long-wave infrared (LWIR) HgCdTe detector in this paper. Based on the practical parameters of experiment the theoretical model of temperature-rise is adopted to calculate the variation of the temperature with the time and the power of laser for laser irradiation on the detector. After that the damage threshold is 110W/cm2. This experimental phenomenon well agrees with the results predicted by the theoretical calculation. The conclusions have a certain reference value for the laser defense of detector. 2011 IEEE. the high-power laser damage mechanism to LWIR detector is discussed and compares with the experimental results of laser irradiation the detector on the distance of 15km. The theoretical and experimental results demonstrate that the interference threshold of the detector is 20.5W/cm 2

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：27/0 | 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.

Numerical simulation on seasonal transport variations and mechanisms of suspended sediment discharged from the Yellow River to the Bohai Sea 期刊论文 OAI收割
JOURNAL OF GEOGRAPHICAL SCIENCES, 2010, 卷号: 20, 期号: 6, 页码: 923-937
作者: Li Guosheng(李国胜)

收藏 | 浏览/下载：26/0 | 提交时间：2011/06/10

The Yellow River suspended sediment transport seasonal variation dynamic mechanism numerical simulation