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浏览/检索结果: 共14条，第1-10条 帮助

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Assessment of the pollution levels of potential toxic elements in urban vegetable gardens in southwest China 期刊论文  OAI收割
SCIENTIFIC REPORTS, 2021, 卷号: 11, 期号: 1, 页码: 13
作者:  Gao, Jianing;  Zhang, Dan;  Proshad, Ram;  Uwiringiyimana, Ernest;  Wang, Zifa
  |  收藏  |  浏览/下载：112/0  |  提交时间：2022/01/04
A global analysis of agricultural productivity and water resource consumption changes over cropland expansion regions 期刊论文  OAI收割
AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 2021, 卷号: 321, 页码: 9
作者:  Liu, Zhengjia;  Liu, Yansui;  Wang, Jieyong
  |  收藏  |  浏览/下载：20/0  |  提交时间：2022/09/21
A global analysis of agricultural productivity and water resource consumption changes over cropland expansion regions 期刊论文  OAI收割
AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 2021, 卷号: 321, 页码: 9
作者:  Liu, Zhengjia;  Liu, Yansui;  Wang, Jieyong
  |  收藏  |  浏览/下载：32/0  |  提交时间：2022/09/21
Spatial and temporal patterns as well as major influencing factors of global and diffuse Horizontal Irradiance over China: 1960-2014 期刊论文  OAI收割
SOLAR ENERGY, 2018, 卷号: 159, 页码: 601-615
作者:  Wang, Hong;  Sun, Fubao;  Liu, Wenbin
  |  收藏  |  浏览/下载：20/0  |  提交时间：2019/05/30
Spatial and temporal patterns as well as major influencing factors of global and diffuse Horizontal Irradiance over China: 1960-2014 期刊论文  OAI收割
SOLAR ENERGY, 2018, 卷号: 159, 页码: 601-615
作者:  Wang, Hong;  Sun, Fubao;  Liu, Wenbin
  |  收藏  |  浏览/下载：20/0  |  提交时间：2019/05/30
Spatial and temporal patterns as well as major influencing factors of global and diffuse Horizontal Irradiance over China: 1960-2014 期刊论文  OAI收割
SOLAR ENERGY, 2018, 卷号: 159, 页码: 601-615
作者:  Wang, Hong;  Sun, Fubao;  Liu, Wenbin
  |  收藏  |  浏览/下载：13/0  |  提交时间：2019/05/30
The research on statistical properties of TDI-CCD imaging noise (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Gu Y.-Y.; Shen X.-H.; He G.-X.
收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25
TDI-CCD can improve the sensitivity of space camera without any degradation of spatial resolution which is widely used in aerospace imaging devices. The article describes the basic working principle and application characteristics of TDI-CCD devices  analyses the composition of TDI-CCD imaging noise  and propose a new method to analyze TDI-CCD imaging noise with statistical probability distribution. In order to estimate the distribution of gray values affect by noise we introduced the concept of skewness and kurtosis. We design an experiment using constant illumination light source  take image with TDI-CCD working at different stage such as stage 16  stage 32  stage 48  stage 64 and stage 96  analyse the characteristics of image noise with the method we proposed  experimental results show that the gray values approximately meet normal distribution in large sample cases. 2011 SPIE.  
Progress in global ecological modelling SCI/SSCI论文  OAI收割
2011
Yue T. X.; Jorgensen S. E.; Larocque G. R.
收藏  |  浏览/下载：100/0  |  提交时间：2012/06/08
An ice-core proxy for Antarctic circumpolar zonal wind intensity 会议论文  OAI收割
28th Symposium of the Scientific-Committee-on-Antarctic-Research, Bremen, GERMANY, JUL 28-29, 2004
作者:  Kang SC(康世昌)
收藏  |  浏览/下载：31/0  |  提交时间：2010/06/08
Land use dynamics and landscape change pattern in Hetao irrigation district, Inner Mongolia, China 会议论文  OAI收割
6th International Symposium on Digital Earth: Data Processing and Applications, Beijing, China, September 9, 2009 - September 12,2009
Zhang, Yinhui; Luo, Yi; Zhao, Wenwu
收藏  |  浏览/下载：27/0  |  提交时间：2014/12/07
This study analyzed spatial and temporal changes in land use in an irrigation district covering an area of 1.7 million ha in Northern China by GIS analyses and also investigated changes in landscape pattern using the landscape structure analysis program FRAGSTATS over the study period from 1986 to 2000. The decreases in farmland and the increases in grassland area mainly resulted from the policy of grain for green and converting slope farmland into pasture from China government. In spite of the efforts to conserve the fragile ecosystem  the land degradation  including soil salinization and grassland degradation  was spreading rapidly. The area of alkali-saline land increased by 22493 ha and about 50555 ha of dense grassland degraded into mid-density grassland. In terms of landscape fragmentation  both farmland and dense grassland showed the tendency of increased fragmentation. Both adverse natural conditions and human activities are responsible for the land degradation expansion in Hetao irrigation district  but the root causes are increasing population pressure and irrational human activities  such as flooding irrigation method and over-grazing. To prevent land degradation from spreading  population control and improvement of the management are prerequisite approaches. 2010 SPIE.