机构

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

采集方式

• OAI收割 [4]

内容类型

• EI期刊论文 [2]
• 会议论文 [1]
• 期刊论文 [1]

发表日期

• 2013 [1]
• 2012 [1]
• 2006 [1]
• 2004 [1]

学科主题

筛选

浏览/检索结果: 共4条，第1-4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 Improved continuous wavelet analysis of variation in the dominant period of hydrological time series EI期刊论文  OAI收割 2013 作者:  Sang Yan-Fang 收藏  |  浏览/下载：24/0  |  提交时间：2014/12/31 Maximum entropy methods  Spectrum analysis  Time series  Wavelet analysis  Wavelet transforms   Period identification in hydrologic time series using empirical mode decomposition and maximum entropy spectral analysis EI期刊论文  OAI收割 2012 作者:  Sang Yan-Fang;  Liu Changming;  Wang Zhonggen 收藏  |  浏览/下载：31/0  |  提交时间：2012/11/23 Maximum entropy methods  Functions  Signal processing  Spectrum analysis  Time series analysis  White noise   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.   SAD phasing by combination of direct methods with the SOLVE/RESOLVE procedure 期刊论文  OAI收割 ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY, 2004, 卷号: 60, 页码: 1244 Wang, JW; Chen, JR; Gu, YX; Zheng, CD; Jiang, F; Fan, HF; Terwilliger, TC; Hao, Q 收藏  |  浏览/下载：23/0  |  提交时间：2013/09/24 ANOMALOUS-SCATTERING DATA  COMBINING DIRECT METHODS  STATISTICAL DENSITY MODIFICATION  PROTEIN CRYSTAL-STRUCTURES  ISOMORPHOUS REPLACEMENT  S-ATOMS  ENTROPY MAXIMIZATION  MAXIMUM-ENTROPY  SULFUR  RESOLUTION