星體演化 的英文怎麼說
中文拼音 [xīngtǐyǎnhuà]
星體演化
英文
stellar evolution-
The extreme carbon stars, whose derived mass loss rates and optical depths are both very high, are more evolved than infrared carbon stars. these stars are expected to evolve into protoplanatary nebula soon
極端碳星是高度演化后的紅外碳星，它的質量損失率及光深都非常高，幾乎沒有其光學對應體，並將很快演化為前行星狀星雲。A quantitative analysis of this idea led to the prediction that a star remaining about three times the mass of the sun at the end of its evolution ( usually as a neutron star ), will almost inevitably shrink to the critical size needed to undergo a gravitational collapse
該想法的定量分析導致預言一顆恆星在終止它演化時候保持大約三倍太陽的質量（通常看做一顆中子星） ，將會幾乎不可避免收縮到臨界體積必須遭受引力坍塌。Evolution of stars of all masses takes place on a hydrodynamic time scale.
各種質量的恆星的演化，均以流體力學的時間尺度進行。On the bases of the galaxy evolution theory, we use the therotical chemical evolution model of three zone ( such as halo, thick disk and thin isk ) and multi - phase ( diffuse gas, molecular clouds, stars of both low and high mass, the remnants ). by comparing with the observational constraints, such assurface densities, age - metallicity relation, g - dwarf metallicity distribution in the solar neighbourhood and the correlation between [ a / fe ] and [ fe / h ], supernovae rates, infall rates. the rationality of the model is verified. based on the theory model, we calculate the abundance of neutron capture element
本文正是在銀河系化學演化的基礎上，利用銀河系的三成分（ threezone ） （即暈、厚盤和薄盤）多相（ multi - phase ） （氣體，分子云，大、小質量恆星以及剩餘物質）的化學演化的理論模型，通過與觀測約束（質量面密度、場星的年齡-金屬豐度關系、太陽附近g矮星金屬含量分佈函數、三成份的特徵量、元素的星系化學演化、超新星的爆炸率、內落速率等）的比較，來檢驗模型的合理性。" this questions our understanding of how giant planets are formed and evolve, " said robert noyes, a senior physicist at the harvard - smithsonian center for astrophysics ( cfa )
"這向我們對于大行星是如何行成演化的理解提出了置疑. "羅伯特?諾伊斯說.他是哈佛-史密森納天體物理中心的一名資深物理學家The asteroids are the most important small bodies in the solarsystem, and they mainly lies in the two locations - a main belt between the mars ' s orbit and the jupiter ' s and the near - earth space. the most feature of the orbits of near - earth asteroids ( neas ) is that the semi - major axes of the orbits are nearly equal to that of the earth or the perihelia distances are approximate to or even less than the mean distance between the sun and the earth, thus they could move into inside of the earth ' s orbit, so that they might close approach or even colliside with the earth ( or other planets, such as the venus, the mars, etc. ). the characteristic brings about some difficulties in the numerical research during their orbital evolution, which leads to the failure of the normalization technique in the general removal impact singularities of celestial mechanics methods and the symplectic algorithm which is successfully applied to the investigation in quality. by comparing the computation effects of several common numerical methods ( including symplectic algorithm ), and considering the nature of the movement of the small bodies, the corresponding treatments are provided here to improve the reliability of the computation
小行星是太陽系最重要的一類小天體，主要分佈在兩個區域；火星和木星軌道之間的一條主帶和近地空間.近地小行星軌道的最大特點是其軌道半長徑與地球軌道半長徑相近，或近日距離接近甚至小於日地平均距離，其運動可深入到地球軌道的內部，這將導致該類小行星與地球（還有金星、火星等）十分靠近甚至發生碰撞.這一特徵給其軌道演化數值研究帶來一些困難，包括天體力學方法中一般消除碰撞奇點的正規化處理以及對定性研究十分成功的辛演算法都將在不同程度上失效.通過對幾種常用數值方法（包括辛演算法）計算效果的比較，根據小天體運動自身的特性，給出了相應處理措施，從而可提高計算結果的可靠性We form a ly a line sample from spectra of 19 qsos in the literature. in this analysis, we demonstrate that a proximity effect is present in the data ; i. e., there exists a significant deficit of lines at zabs = zem, within 4h - 1 mpc of the qso emission redshift. and the deficit depends on the rest equivalent width of the lines, with weak lines showing a relatively weaker effect
我們發現所選樣本中確實存在接近效應，特別在z _ （ abs ） z _ （ em ）附近距類星體4h ~ （ - 1 ） mpc范圍內， ly森林的線數相對演化規律估計得到的線數缺少很顯著，並且與譜線的靜止等值寬度有關，弱線的接近效應較弱。Two also lie near very dense clusters of massive young stars, intimating that sgrs tend to form from such stars
其中兩顆還與由大質量的年輕恆星所組成的緻密星團距離很近，這表示sgr可能是由這類星體所演化而來的。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；恆星、太陽、正常的恆星、恆星形成；恆星演化、超新星、緻密天體（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。The aim of the galaxy chemical evolution research is to reproduce the element abundance patter of stars and gas in the galaxy
銀河系化學演化研究的任務，從根本來說，是重現銀河系中恆星與氣體的元素豐度分布圖象。The average abundance distributions of heavy elements in metal - poor stars can provide fairly direct and detailed information on the nucleosynthesis in every stage after the formation of galaxies. furthermore, it can put more accurate constraints on the chemical evolution of neutron - capture elements. the solution to this problem will have important effect on the solution to a series of problems about nuclear astrophysics and the galactic evolution
貧金屬星的中子俘獲元素豐度分佈能提供星系形成后各個階段核合成的較為直接和詳細的信息，並為星系化學演化的研究提供更為準確的約束，這一問題的解決將對核天體物理及星系化學演化的一系列問題的解決產生重要影響。92km3 in 94 - 95. the comparison indicate that interannual variability of simulated and estimated outflow are very close, both of them have an upward trend in the 20 years. but 20 years average quantity of simulated outflow is less than the quantity of estimated outflow. the simulated outflow is about 90 % of estimated. for study the relationship between temperature and sea ice of arctic and the velocity of wind how to influence arctic sea ice, some ideal modeling are run
與衛星資料反演流出量比較結果表明，模擬流出量和衛星反演流出量的年際變化非常一致，總體上都有增多的趨勢，但在數值上有一定差距，平均而言冬季海冰面積流出量，反演值小於模擬值，而全年則是模擬值小於反演值，約是衛星反演流出量的90 。Simple laws of physics suggest, that gas-dust complexes in the interstellar medium may evolve, first into protostars and subsequently into stars.
簡單的物理學定律揭示出，星際介質中的氣塵復合體可以進化，先是演化為原恆星，接下去再演化為恆星。British mathematician, astronomer, and physicist who was an early exponent of the theory of relativity and conducted research on the evolution, structure, and motion of stars
愛丁頓，阿瑟?斯坦利1882 1944英國數學家、天文學家和物理學家，相對論的早期擁護者，在星體演化、結構和運動方面有很深研究In this area, visitors can select videodisc programmes on stellar evolution and star systems. they can also visualize the spatial relationship between component stars of such famous celestial configurations as the orion and the big dipper
觀眾可選看關于恆星演化和恆星系統的影碟節目，他們亦可看到著名的獵戶座和北斗七星內各星體之間的空間關系。Mars was covered in large minerals and was a place of spiritual retreat and evolution for those incarnate upon maldek
火星上覆蓋著大量的礦物，是馬爾戴克上的個體們進行精神靜修和演化的地方。Professor kwok enjoys high international standing in the field of stellar evolution and astrochemistry
郭教授在星體演化及天文化學領域上的國際地位甚高。These findings, on one side, broaden current knowledge about the early evolutionary history of the lycopsid characters, and on the other side, indicate that those satellite taxa should also be taken into consideration besides those whole or almost whole species when making a phylogenetic analysis
這些植物既拓寬了對石松植物整個譜系的性狀演化的認識，也暗示在進行譜系分析及分類時不僅要基於一些整體植物種或者接近完整的屬種，而且必須重視眾多衛星分類單元的系統位置以及它們的演化意義。Our model introduces the general equations of chemical evolution used in galaxies to studies of gcs. in this model the important gas outflow caused by the supernova explosion and other processes during the formation of globular clusters is included. based on such a self - enrichment model, monte carlo method is used to simulate the formation and chemical evolution of globular cluster systems, from which a new explanation of the bimodal metallicity distribution can be given
本文把星系演化中通用的化學演化方程引入到球狀星團這一系統中來，特別考慮到球狀星團中恆星形成過程中超新星爆發等因素引發的氣體外流，把這一重要的物理過程包含到化學演化方程中，並用蒙特卡羅方法來模擬球狀星團系統的自增豐演化。They are important objects in studying stellar evolutions
這些天體都和恆星的演化有密切的關系。分享友人