行星演化 的英文怎麼說
中文拼音 [hángxīngyǎnhuà]
行星演化
英文
planetary 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。Dealing with remote sensing data of different time ( 1987, 1996 landsat tm, and 2000 china - brazil earth resource satellite ccd ) and using the gis technology, the dissertation extracts the changing information of the desertification. the dissertation makes a dynamic remote sensing analysis on the desertification of the research region, and discusses the temporal and spatial evolving law of the desertification
在技術上主要採用了1987 、 1996年的陸地衛星tm數據以及2000年中巴資源衛星1號ccd數據三個不同時相的遙感數據進行圖像處理，並利用gis較強的空間分析功能，從中提取研究區土地沙漠化的變化信息，同時與研究區的其他信息數據進行疊加分析，探討了研究區土地沙漠化的時空演化特點。Given the initial conditions including ( 1 ) number density distribution in space which has the similar form to the present day ones, ( 2 ) both the power law and gaussian mass functions for clusters, and ( 3 ) two different velocity distributions which one has a constant dispersion and the other is described by the eddington formula, the dynamical evolution of globular clusters in our milky way galaxy is investigated in detail by means of monte carlo simulations
本文採用與觀測結果具有相同形式的球狀星團空間密度分佈函數，在給定兩種球狀星團系統的初始質量譜（冪律的和對數高斯的）和兩種球狀星團系統的初始速度分佈函數（愛丁頓速度分佈函數和常數的速度彌散度）條件下，我們採用montecarlo的方法對球狀星團系統的動力學演化進行討論。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。Many planets ( for example, ganymede, mercury, the earth, jupiter and saturn ) and stars ( for example, the sun ) possess intrinsic magnetic fields. the explanation for their existence and variation remains a great challenge to planetary scientists and astrophysicists. this article attempts to review some recent developments and difficulties in the study of magnetohydrodynamics for the electrically conducting fluid interiors of planets and stars. it is the fluid motions, usually driven by thermal convection, that generate and sustain magnetic fields through magnetohydrodynamic processes in planets and stars. in planets, the magnetohydrodynamic processes are strongly affected by the combined and inseparable effects of rotation, magnetic fields and spherical geometry. the key dynamics involves the interaction between the coriolis and lorentz forces. in the sun, it is the solar tachocline, a thin shear flow layer located at the base of the convection envelope, that plays an essential role in the solar magnetohydrodynamic processes which produce the 11 - year sunspot cycle. some results of a new nonlinear three - dimensional solar dynamo model are also presented
許多行星（如木衛三，水星，地球，木星和土星）和恆星（如太陽）具有內部磁場.對這些磁場的存在和變化的解釋對行星科學家和天體物理學家是一個巨大的挑戰.本文試圖總結行星和恆星的導電流體內部磁流體力學研究的新近發展和困難.一般由熱對流驅動的流動通過磁流體力學過程產生並維持在行星和恆星中的磁場.在行星中磁流體力學過程強烈地受到轉動，磁場和球幾何位型的綜合影響.其動力學的關鍵方面涉及科里奧利力和洛倫茲力間的相互作用.在太陽中其流線，即處于對流層的薄的剪切流層在太陽的磁流體力學過程中扮演了一個基本的角色，並由之產生了11年的太陽黑子周期.本文也給出了一個新的非線性三維太陽發電機模型This thesis studies the tidal creek system on the prograding mud flat in jiangsu province based on 16 pieces of mss, tm and spot images from 1973 to 2001, and analyses the growth, genetic classification, evolution and affecting factors of tidal creeks
本文結合1973年至2001年共16張不同時相的衛星影像對江蘇淤長型淤泥質潮灘上的潮溝系統進行了研究，對潮溝的發育、形成、演化和影響因素進行了初步探討。" 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During the early stages of planetary evolution they served to sweep the solar system.
在行星演化的早期，他們用來清掃太陽系。We had observed more than ten selected asteroids using 1 - meter telescope in yunnan observatory during 2000 to 2002. the observational data of seven asteroids had been reduced and analyzed. we have derived their synodic periods and estimated the shape and orientation of rotational axis for one asteroid
為此，我選定了一些直徑在125公里左右的小行星進行觀測和分析；一方面，測定它們的自轉周期，進行「角動量衰減」現象的研究，另一方面，對小行星形狀和自轉軸指向進行估算，為小行星碰撞演化研究提供更為有利的證據。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。These were the protoplanets from which the planets of the present developed.
這些就是原行星，現在的行星正是從它們演化而來的。We might therefore retrace the tectono - magmatic evolutionary history of orogenic belts in the light of characteristics of volcanic magmatism at different forming and evolutionary stages of orogenic belts and further explore some important scientific problems of global dynamics and comparative planetary dynamics by means of comparison on larger scales
因此，可以根據造山帶形成、演化不同階段火山巖漿作用的特點來重溯造山帶的構造巖漿演化歷史，進而從更大尺度上加以對比，探索全球動力學乃至比較行星動力學等重大科學問題。We might retrace the history of tectono - magmatic evolution of volcanic magmatism at different stages of formation - evolution of orogenic belts and further explore some important scientific problems of global dynamics and comparative planetary dynamics by means of comparison in larger scales
因此，我們可以根據造山帶形成演化不同階段火山巖漿作用的特點來重溯造山帶的構造-巖漿演化歷史，並進而從更大尺度上加以對比，探索全球動力學乃至比較行星動力學等重大科學問題。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。Borne on solar winds might have triggered the evolution of early planetary life
高能量的宇宙風暴之下可能會引發早期行星生命的演化This hourglass nebula is the closing phase of a sun - like star s life as its outer layers are ejected
沙漏星雲是與太陽相似的恆星演化最後階段，恆星把外殼噴出，形成行星狀星雲。If superintelligent aliens appeared and claimed credit for creating life on earth ( or even particular species ), the purely evolutionary explanation would be cast in doubt
要是智慧超人的外星人現身地球，宣稱地球上的生命（或某個生物）是他創造的，那麼想以演化作為地球生命史的唯一解釋，就行不通了。This phenomenon farther surport our conclusion in the analysis of evolution stars, i. e. the difference of stellar chromosphere and corona activity of evolution stars is bred by the energy balance and heating mechanism in stellar chromosphere and corona
M型主序星在演化恆星的冕球活動與色球活動行為的差異則是由於m型主序星的色球與冕球間存在的能量平衡和轉移過程產生的。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。分享友人