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A new method for imaging faint objects nearby a bright source

chinese Science Bulletin 2000年第3期45卷 201-207页

作者： YE Binxun & CHU Yi1. beijing astronomical Observatory, chinese academy of sciences, beijing 100012. china 2. NAOCAS, beijing 100012. china 3. Department of Astronomy, Nanjing University, Nanjing china correspondence should be addressed to Ye Binxun beijing astronomical Observatory Chinese Academy of Sciences Beijing China NAOCAS Beijing China Department of Astronomy Nanjing University Nanjing China

In astronomical observation, it is difficult to obtain the image of faint objects in the peripheral area around a bright celestial body. in order to solve the problem, a new method is designed and experimented, which is called the separation readout technique (SRT). SRT is different from either the traditional coronagraphy or the newly-developed anti-blooming CCD technique, and allows an enough-long exposure to the faint objects in the area around a bright celestial body with the well-preserved bright body’s image in one frame. This paper describes in detail the principle of SRT, the computer simulation, the experimental devising and result of SRT observation on a telescope.

关键词： astronomyical methods CCD imaging SRT.

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Population information extraction in Chaohu watershed based on RS and GIS

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chinese Science Bulletin 2003年第2期48卷 181-183页

作者： liu jianjun1,2 & LI Chunlai3.1. Institute of Geochemistry, chinese academy of sciences, Guiyang 550002, {3. 2. Graduate School, chinese academy of sciences, beijing 10003., {3. 3. national astronomical observatories, chinese academy of sciences, beijing 100012. china correspondence should be addressed to liu jianjun (e-mail: dhsliujj@ ***) Institute of Geochemistry Chinese Academy of Sciences Guiyang China Graduate School Chinese Academy of Sciences Beijing China national astronomical observatories Chinese Academy of Sciences Beijing China

It is always difficult to extract population in-formation of small watershed during the region environment assessment. The report adopted compound areal interpola-tion to study the population in Chaohu watershed with the GIS technique and landuse interpretation data from remote sensing. The result indicated that the method is effective to extract population information of small watershed.

关键词：巢湖流域人口分布信息提取 RS GIS 小流域生态环境评价

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Possible triggering of solar activity to big earthquakes (Ms ≥ 8) in faults with near west-east strike in china

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Science china(Physics,Mechanics & Astronomy) 2004年第2期47卷 173-181页

作者： HAN Yanben1, GUO Zengjian1,2, WU Jinbing1,2 & MA Lihua1 1. national astronomical observatories,{3., beijing 100012. china 2. Earthquake Research Institute of Lanzhou, CSB, Lanzhou 73.00, china correspondence should be addressed to Han Yanben (email: hyb@***) national astronomical observatories Chinese Academy of Sciences Beijing China Earthquake Research Institute of Lanzhou CSB Lanzhou China

This paper studies the relationship between solar activity and big earthquakes (Ms≥8) that occurred in china and western Mongolia. It is discovered that the occurrence dates of most of the big earthquakes in and near faults with west-east strike are close to the maximum years of sunspot numbers, whereas dates of some big earthquakes which are not in such faults are not close to the maximum years. We consider that it is possibly because of the appearance of many magnetic storms in the maximum years of solar activity. The magnetic storms result in anomalies of geomagnetic field and then produce eddy current in the faults gestating earthquake with near west-east strike. Perhaps the gestated big earthquakes occur easily since the eddy current heats the rocks in the faults and therefore decreases the shear resistant intensity and the static friction limit of the rocks .

关键词： earthquake, solar activity, magnetic storm, eddy current.

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