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The messier objects as a tool in teaching astronomy
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作者 Jesus Rodrigo F. Torres 《Natural Science》 2013年第3期321-325,共5页
The French astronomer Charles Messier (1730- 1817) compiled a catalogue [1] of astronomical objects which reached109 innumber after additions by later astronomers were added. The catalogue contains galaxies, emission ... The French astronomer Charles Messier (1730- 1817) compiled a catalogue [1] of astronomical objects which reached109 innumber after additions by later astronomers were added. The catalogue contains galaxies, emission nebulae, a supernova remnant, a double star, globular clusters, open clusters, an asterism, a star cloud, and planetary nebulae. While the objective of Messier in compiling the catalogue was to guide comet hunters not to be confused by his objects which he thought looked like comets [2], the Messier Catalogue as it later became known became a standard guide to astronomers for a study of the sky’s “greatest hits” or the best samples of objects which can be observed and studied. This paper explores the value of the Messier Catalogue in the teaching of Astronomy and Earth Science. The range of objects is wide and contains some of the best examples of their type. The teaching method I propose is the actual observations of the objects through a telescope, with the corresponding explanation. Some principles which will be covered through this process are stellar evolution from the birth and death of stars, galaxy types, formation of galaxies, galactic interactions, life in the Universe, cosmology, and our place in the Universe. 展开更多
关键词 ASTRONOMY EARTH SCIENCE Education Astronomical Observing messier OBJECTS
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Messier撞击坑辐射纹形成及斜撞击研究
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作者 张新琴 夏秀文 王永江 《地球物理学进展》 CSCD 北大核心 2015年第2期488-492,共5页
具有辐射纹的撞击坑是一种特殊的撞击构造,只形成于某些区域一定规模的撞击事件.由于大部分撞击事件都是斜撞击,本文以Messier复合撞击坑为例研究并模拟了斜撞击抛射和辐射纹形成物理过程.Messier复合撞击坑包含Messier撞击坑和Messier ... 具有辐射纹的撞击坑是一种特殊的撞击构造,只形成于某些区域一定规模的撞击事件.由于大部分撞击事件都是斜撞击,本文以Messier复合撞击坑为例研究并模拟了斜撞击抛射和辐射纹形成物理过程.Messier复合撞击坑包含Messier撞击坑和Messier A撞击坑,是月球上典型的小角度斜撞击形成的撞击坑.对Messier复合撞击坑的对称性分析发现,Messier A撞击坑对称轴相对于Messier撞击坑对称轴存在一个逆时针小角度偏转,这个小角度偏转说明Messier复合撞击坑起源于一次非理想斜撞击.基于对辐射纹形成过程的认识,本文建立了斜撞击抛射模型,合理解释了Messier复合撞击坑的南北方向辐射纹以及朝西方向辐射纹成因;并利用蒙特卡洛方法数值模拟了斜撞击产生的辐射纹分布,为Messier复合撞击坑的形成提供了一种新的合理解释. 展开更多
关键词 messier复合撞击坑 溅射堆积 辐射纹 蒙特卡洛方法
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企业实施《计量保证方案》的必要性及作用
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作者 卢世萍 《电子质量》 1996年第8期13-16,共4页
介绍了《计量保证方案》的产生、原理及其在企业中的应用,概括了企业实施《计量保证方案》的必要性及作用。
关键词 ISO10012标准 计量保证方案 企业
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