mass n. 彌撒;彌撒的儀式[禱告、音樂(lè)];彌撒曲。 a high [solemn] Mass (有燒香、奏樂(lè)等的)大彌撒。 a low [private] Mass (無(wú)燒香、奏樂(lè)的)小彌撒。 by the Mass 一定,的確。 say [read] Mass 作彌撒,念經(jīng)。 n. 1.塊,堆,團(tuán)。 2.群眾,集團(tuán);〔the masses〕群眾;民眾。 3.大量;大宗;眾多;〔the mass〕大部分,大半;主體;總體。 4.【物理學(xué)】質(zhì)量。 5.【軍事】集團(tuán)縱隊(duì),密集隊(duì)形。 6.【礦物】體。 a mass of earth 一大塊泥土。 a mass of letters 一大堆信件。 The masses have boundless creative power. 人民群眾有無(wú)限的創(chuàng)造力。 a mass of manoeuvre 實(shí)施機(jī)動(dòng)集團(tuán)。 proper mass 靜質(zhì)量。 the masses 群眾,大眾。 be mass of 一團(tuán)…,全身…,遍體…(He is a mass of bruises. 他遍體鱗傷)。 from the masses, to the masses 從群眾中來(lái),到群眾中去。 in the mass 整個(gè)兒地;總體上,合計(jì)。 the (great) mass of... …的大部分。 to be at one with the masses 同群眾打成一片。 vt. 使成一團(tuán);集中(力量等);【軍事】使密集。 vi. 集中,聚集。 massed body 【軍事】密集部隊(duì)。 massed formation 【軍事】密集隊(duì)形。 mass action 【物理學(xué)】質(zhì)量作用;濃度作用。
Comparing with the current observations , which include the number density distribution in space , mass function , etc . , the so - called standard modes for both the power law and gaussian cluster initial mass functions are selected among many runs of simulations . the deviation from the standard modes , which is resulted from the change of the parameter for the initial conditions , is discussed in detail . the discussion of the model parameters is also presented although they are adopted as the typical values based on previous work 對(duì)應(yīng)一定的初始分布我們發(fā)現(xiàn)無(wú)論是冪律的還是對(duì)數(shù)高斯的球狀星團(tuán)初始質(zhì)量譜經(jīng)過(guò)長(zhǎng)時(shí)間的動(dòng)力學(xué)演化都會(huì)得到和現(xiàn)在銀河系觀(guān)測(cè)到的球狀星團(tuán)系統(tǒng)相符的對(duì)數(shù)高斯的質(zhì)量分布;動(dòng)力學(xué)演化會(huì)明顯地改變球狀星團(tuán)系統(tǒng)的空間密度分布,靠近銀心區(qū)域的球狀星團(tuán)瓦解得更多;經(jīng)過(guò)動(dòng)力學(xué)演化后的球狀星團(tuán)速度分布函數(shù)在靠近銀心的區(qū)域明顯得不同于初始分布,初始擁有較大軌道偏心率的球狀星團(tuán)更容易瓦解。
The number density distribution of globular cluster in space will change with time due to the dynamic evolution , especially for those in the central region of the galaxy ; 5 . for the power law initial cluster mass function , the peak value of the mass function after the dynamic evolution is sensitive to the lower limit of the initial mass function we adopt . the suggested value in this paper is - 104m , which is consistent with that reduced from the dynamical analyses for the giant molecular clouds 對(duì)于冪率的初始質(zhì)量譜,球狀星團(tuán)系統(tǒng)動(dòng)力學(xué)演化后質(zhì)量分布的轉(zhuǎn)折點(diǎn)質(zhì)量主要是由初始質(zhì)量函數(shù)的質(zhì)量下限決定的,最為適合的值為10 ~ 4m _ ;冪率的初始質(zhì)量譜的譜指數(shù)對(duì)球狀星團(tuán)系統(tǒng)動(dòng)力學(xué)演化后質(zhì)量分布的轉(zhuǎn)折點(diǎn)質(zhì)量也有影響,其最佳值為1 . 5 2 . 0 ;經(jīng)過(guò)大約5gyr的動(dòng)力學(xué)演化,冪率的初始質(zhì)量譜就會(huì)演化成為高斯的對(duì)數(shù)質(zhì)量分布并具有在隨后的動(dòng)力學(xué)演化中保持對(duì)數(shù)高斯形式質(zhì)量分布的特性。
百科解釋
The initial mass function (IMF) is an empirical function that describes the distribution of initial masses for a population of stars. The IMF is often given as a probability distribution function (PDF) for the mass at which a star enters the main sequence (begins hydrogen fusion).