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star cluster 【天文學】星團。

star grass

In the process of building the multidimensional data model , we made some mends on the time dimension , adapted the time model based on competition , and this model provided enough information for the later analysis based on time . and contempary , this paper used a new schema called star cluster schema as the basic structure of the multidimensional data model . the cluster schema is the joint of star schema and snowflake schema , it inherits their merits , and mends their disadvantages 在具體的建模過程中,對時間維作了一定的修正,提出了一種基于競爭機制的時間維模型,為基于時間的分析提供了更加充分的信息;同時本文也對常用的多維數據模型的結構作了改進,采用了一種稱作為星族模式的結構,這種結構結合了星型模式和雪片模式的優點,同時又對各自的缺點進行了修正,并在實際中得到了很好的應用。

Topics include : planets , planet formation ; stars , the sun , “ normal “ stars , star formation ; stellar evolution , supernovae , compact objects ( white dwarfs , neutron stars , and black holes ) , plusars , binary x - ray sources ; star clusters , globular and open clusters ; interstellar medium , gas , dust , magnetic fields , cosmic rays ; distance ladder ; galaxies , normal and active galaxies , jets ; gravitational lensing ; large scaling structure ; newtonian cosmology , dynamical expansion and thermal history of the universe ; cosmic microwave background radiation ; big - bang nucleosynthesis 課程的主題包含了:行星、行星形成;恒星、太陽、正常的恒星、恒星形成;恒星演化、超新星、致密天體(白矮星、中子星及黑洞) 、波霎、雙x -射線源;星團、球狀及疏散星團;星際介質、氣體、塵埃、磁場、宇宙射線;距離階梯;星系、正常及活躍星系、噴流;重力透鏡;大尺度結構;牛頓宇宙學、宇宙的動力膨脹及溫度發展歷史;宇宙背景微波輻射;大霹靂核合成。

When taking photographs of the sun , the slowest film of speed iso25 is used . for moon , lunar eclipses and total solar eclipses , film of speed from iso100 to iso400 is suitable . whereas film of speed from iso400 to iso3200 fits for shooting star field , the milky way , nebulae , star clusters , galaxies and comets 拍攝太陽可以選用最慢速的底片2 5度拍攝月球日食及月食可選用中速1 0 0度至高速4 0 0度底片拍攝星野銀河星云星系或彗星可選用高速4 0 0度至超高速3 2 0 0度底片。

Allowing for selection effect , about 1 per cent of all f and g dwarfs are w uma systems , and so understanding the origin and evolution of w uma stars are of importance for investigations in the evolution of the star clusters and galaxies 如果考慮了觀測選擇效應的影響,約1左右的f和g型矮星都是wuma型相接雙星。因此,了解wuma型相接雙星的起源和演化對研究星系和星團的演化有十分重要的意義。

Overview of universe ; solar system ; inter - stellar distance ; properties of stars ; classification and evolution ; star nebulae ; star cluster , structure and classification of glaxies ; cosmology ; observateries and telescopes 宇宙概觀、太陽系、星距量測、星的性質、分類與演化、星云、星團、銀河、系結構分類、宇宙論、天文臺及望遠鏡。

The fantasy - like landscape of the nebula is sculpted by the intense pressure of starlight from monster stars and their accompanying star clusters , as well as the hydrodynamics of their stellar winds of charged particles 這夢幻般的景象是由巨星及其伴生星協發出的強烈光壓,以及其帶電粒子的星風產生的流體力學所塑造出的。

This thesis brings forward a weighted star cluster algorithm that can reflect the users “ information requirements better through focusing on the documents in which users are most interested to build clusters 本文提出的加權的星型聚類算法傾向于圍繞用戶興趣度高的文檔來構造文檔簇,從而更好地反映用戶的信息需求。

Theoretical modeling suggests that the star cluster mgg - 11 is the first intermediate mass black hole candidate of 1000 times the mass of the sun 理論模型顯示mgg - 11星團很可能是首個被發現的中型質量黑洞,它的質量是太陽的一千倍

Shara ' s research interests include stellar collisions , novae and supernovae , and the populations of stars that inhabit star clusters and galaxies 夏拉的研究興趣包括恒星碰撞、新星與超新星,以及星團和星系內恒星的數目分布。

Based on some traditional algorithms , this thesis provides a weighted star cluster algorithm to learn user profile 對已有算法進行改進,提出了一種加權的星型聚類算法以學習用戶的興趣特征。

That is to say , the larger the star clusters or galaxies , the more massive the black hole in the centre 也就是說,越大的恒星集團,中心就擁有質量越大的黑洞。

One way to see more massive stars have shorter lives is to study the star clusters 大質量恒星壽命較短的直接證據可以在星團中找到。

We can also talk about the absolute magnitudes of objects like star clusters , galaxies , etc 絕對星等的概念可推廣至星團星系等。

Nebulae , star cluster and galaxies 星云星團及星系

Dense star clusters are a veritable demolition derby 稠密的星團里,簡直就像在上演一場爆破大賽。

The star cluster of the pleiades is located at 28 degrees taurus 昂宿星團的星群位于金牛座28度。

A galaxy or a star cluster consists mainly of the stars 星系和星團主要由恒星組成。