机构

• 金属研究所 [2]
• 地理科学与资源研究所 [2]
• 长春光学精密机械与物... [1]
• 植物研究所 [1]

采集方式

• OAI收割 [6]

内容类型

• 期刊论文 [4]
• SCI/SSCI论文 [1]
• 会议论文 [1]

发表日期

• 2020 [2]
• 2011 [1]
• 2009 [2]
• 2006 [1]

学科主题

• Environmen... [1]

筛选

浏览/检索结果: 共6条，第1-6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 Assessing the collapse risk of Stipa bungeana grassland in China based on its distribution changes 期刊论文  OAI收割 JOURNAL OF ARID LAND, 2020, 页码: 15 作者:  Qiao, Xianguo;  Guo, Ke;  Li, Guoqing;  Zhao, Liqing;  Li, Frank Yonghong   |  收藏  |  浏览/下载：21/0  |  提交时间：2020/05/19 climate change  limiting factors  maximum entropy algorithm  potential distribution  realizable distribution   Assessing the collapse risk of Stipa bungeana grassland in China based on its distribution changes 期刊论文  OAI收割 JOURNAL OF ARID LAND, 2020, 卷号: 12, 期号: 2, 页码: 303-317 作者:  Qiao, Xianguo;  Guo, Ke;  Li, Guoqing;  Zhao, Liqing;  Li, Frank Yonghong   |  收藏  |  浏览/下载：19/0  |  提交时间：2022/03/01 climate change  limiting factors  maximum entropy algorithm  potential distribution  realizable distribution   Predicting potential distribution of Tibetan spruce (Picea smithiana) in Qomolangma (Mount Everest) National Nature Preserve using maximum entropy niche-based model SCI/SSCI论文  OAI收割 2011 Zhang J. P.; Zhang Y. L.; Liu L. S.; Nie Y. 收藏  |  浏览/下载：44/0  |  提交时间：2012/06/08 Picea smithiana  maximum entropy niche-based model  potential  distribution  Qomolangma (Mount Everest) National Nature Preserve (QNNP)  species distributions  rare  algorithm  improve  reserve  maxent   IMPROVEMENT ON THE MODIFIED MAXIMUM ENTROPY METHOD FOR TEXTURE ANALYSIS BY PARTICLE SWARM OPTIMIZATION 期刊论文  OAI收割 ACTA METALLURGICA SINICA, 2009, 卷号: 45, 期号: 1, 页码: 63-66 作者:  Wang Dapeng;  Wang Dazhi;  Wu Baolin;  Zuo Liang;  Wang Fu   |  收藏  |  浏览/下载：14/0  |  提交时间：2021/02/02 ALGORITHM  ODF  particle swarm optimization  texture  orientation distribution function  modified maximum entropy method   IMPROVEMENT ON THE MODIFIED MAXIMUM ENTROPY METHOD FOR TEXTURE ANALYSIS BY PARTICLE SWARM OPTIMIZATION 期刊论文  OAI收割 ACTA METALLURGICA SINICA, 2009, 卷号: 45, 期号: 1, 页码: 63-66 作者:     |  收藏  |  浏览/下载：14/0  |  提交时间：2021/02/02 ALGORITHM  ODF  particle swarm optimization  texture  orientation distribution function  modified maximum entropy method   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.