共查询到20条相似文献，搜索用时 250 毫秒
1.
中国天文学会天文学名词审定委员会 《天文学进展》2008,26(1):95-99
中国天文学会名词审定委员会从1985年开始在<天文学进展>发表天文学名词的推荐译名,到2007年已公布了14批2280个名词.现再推荐第十五批151个名词,其中大多数是近年来出现的天文学新词.希望读者在试用过程中对译名提出改进意见. 相似文献
2.
3.
中国天文学会天文学名词审定委员会 《天文学进展》2007,25(1):96-99
中国天文学会名词审定委员会从1985年起开始在《天文学进展》发表天文学名词的推荐译名,到2006年已公布了13批共2151个名词。现再推荐第14批129个名词,其中大多数是近年出现的天文学新词,希望读者在使用过程中对译名提出改进意见． 相似文献
4.
中国天文学会天文学名词审定委员会 《天文学进展》2006,24(1):89-92
中国天文学会名词审定委员会从1985年起开始在《天文学进展》发表天文学名词的推荐译名,到2004 年已公布了12批共2025个名词。现再推荐第13批126个名词,其中大多数是近年出现的天文学新词。希望读者在使用过程中对译名提出改进意见。 相似文献
5.
中国天文学会天文学名词审定委员会 《天文学进展》2010,28(1)
中国天文学会名词审定委员会从1985年起开始在<天文学进展>发表天文学名词的推荐译名,到2009年已公布16批共2536个名词.现再推荐第17批114个名词,其中大多数是近年出现的天文学新词.希望读者在使用过程中对译名提出改进意见. 相似文献
6.
中国天文学会天文学名词审定委员会 《天文学进展》2009,27(2)
中国天文学会名词审定委员会从1985年起开始在<天文学进展>发表天文学名词的推荐译名,到2008年已公布15批共2431个名词.现再推荐第16批105个名词,其中大多数是近年出现的天文学新词.希望读者在使用过程中对译名提出改进意见. 相似文献
7.
8.
9.
《天文学进展》1994,(2)
中国天文学名词审定委员会在《天文学进展》第3卷第4期（1985）、第7卷第2期（1989）和第9卷第2期（1991）上刊登了本委员会提供的466个天文学名词的推荐译名。现再推荐第四批220个，其中大多数是近年出现在文献上的天文学新名词。希望读者在使用过程中对译名提出改进意见。第四批新词的提供者是天文学名词审定委员会委员沈良照（125个）、李竞、何妙福、叶式、林元章、朱慈。以及热心读者天文学家黄磷。The4thDraftfortheChinese-TranslationofSomeAstronomicalTerms（TheAstronomicalTerminologyCommitteeoftheCAS）英文名推荐译名a… 相似文献
10.
《天文学进展》1998,(2)
中国天文学名词审定委员会在《天文学进展》第3卷第4期（1985）、第7卷第2期（1989）、第9卷第2期（1991）、第12卷第2期（1994和第15卷第1期（1997）上刊登了本委员会提供的1038个天文学名词的推荐译名．现再推荐第七批149个,其中大多数是近年出现在文献上的天文学新名词．希望读者在使用过程中对译名提出改进意见．第七批新词的提供者是天文学名词审定委员会委员沈良照和李竟．##C168||^^The7thDraftfortheChinese-ThanslationofSomeAstronomicalTerms$$$$（TheAstronomicalTerminologyCommitteeoftheCAS）英文名推荐译名absolutee… 相似文献
11.
A new class of exact solutions of Einstein’s field equations with a bulk viscous fluid for an LRS Bianchi type-Ia obtained
by using a time dependent deceleration parameter and cosmological term Λ. The coefficient of bulk viscosity is assumed to
be a power function of mass density (ξ=ξ
0
ρ
n
). We have obtained a general solution of the field equations from which six models of the universe are derived: exponential,
polynomial and sinusoidal form respectively. The behaviour of these models of the universe are also discussed in the frame
of reference of recent supernovae Ia observations.
相似文献
12.
可用于带耗散力卫星轨道长间隔积分的数值积分方法 总被引：2，自引：0，他引：2
本文分析了对称方法不适合带耗散力的卫星轨道长间隔积分的缺陷和本质原因,并针对这个问题,采用文所介绍的方法,构造并推荐了一组积分公式。 相似文献
13.
R. K. Tiwari 《Astrophysics and Space Science》2009,321(2):147-150
Einstein field equations with variable gravitational and cosmological constants are considered in the presence of perfect
fluid for Robertson-Walker universe by assuming the cosmological term proportional to the Hubble parameter. This variation
law for vacuum density has recently been proposed by Schützhold on the basis of quantum field estimations in the curved and
expanding background. The cosmological term tends asymptotically to a genuine cosmological constant and the model tends to
a deSitter universe. We obtain that the present universe is accelerating with a large fraction of cosmological density in
the form of cosmological term. 相似文献
14.
A new class of exact solutions of Einstein's field equations with perfect fluid for an LRS Bianchi type-I spacetime is obtained by using a time dependent deceleration parameter. We have obtained a general solution of the field equations from which three models of the universe are derived: exponential, polynomial and sinusoidal form respectively. The behaviour of these models of the universe are also discussed in the frame of reference of recent supernovae Ia observations. 相似文献
15.
E. Pilat-Lohinger R. Dvorak Ch. Burger 《Celestial Mechanics and Dynamical Astronomy》1999,73(1-4):117-126
The orbits of 13 Trojan asteroids have been calculated numerically in the model of the outer solar system for a time interval
of 100 million years. For these asteroids Milani et al. (1997) determined Lyapunov times less than 100 000 years and introduced
the notion "asteroids in stable chaotic motion". We studied the dynamical behavior of these Trojan asteroids (except the asteroid
Thersites which escaped after 26 million years) within 11 time intervals - i.e. subintervals of the whole time - by means
of: (1) a numerical frequency analysis (2) the root mean square (r.m.s.) of the orbital elements and (3) the proper elements.
For each time interval we compared the root mean squares of the orbital elements (a, e and i) with the corresponding proper
element. It turned out that the variations of the proper elements ep in the different time intervals are correlated with the corresponding r.m.s.(e); this is not the case for sin Ip with r.m.s.(i).
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
16.
A statistical analysis of the contemporary (1954-1975) solar flare particle events has been made for the parametersF (integrated, proton fluence in cm-2 in an event with kinetic energy above 10 MeV) andR
0 (the characteristic rigidity). These data are compared with the long-term averaged values determined from stable- and radio-nuclide
measurements of lunar samples. The analysis shows that the ancient solar flare proton spectrum was harder (higher R0 values) compared to that observed in contemporary flares. A similar analysis can not be made for the mean long-term averaged
flux (ˉJ, cm-2 S-1), since the contemporary averages suffer from an uncertainty due to the statistics of a single event. However, the average
flux estimates for time durations 〈T〉 exceeding 103 yr, are free from such uncertainties. The long-term averaged ˉJ values obtained over different time scales (104 - 106 yr) suggest a possible periodic variation in solar flare activity, with enhanced flux level during the last 105 yr. The available data rule out the occurrence of giant flares, with proton fluence exceeding 1015 cm-2 during the last million years. 相似文献
17.
讨论了非刚体地球受迫章动奥波策项与简正模表达式中倾斜模的关系。结果表明天球历书极章动中倾斜振项对应于角动量极的章动,在球历书极章动与角动量极的章动奥波策项之和。同时还给出了岁差速率与自转极的章动奥波策项间的数学关系。 相似文献
18.
Einstein’s field equations with variable gravitational and cosmological “constant” are considered in presence of perfect fluid
for Bianchi type-I space-time. Consequences of the four cases of the phenomenological decay of Λ have been discussed which
are consistent with observations. The physical significance of the cosmological models have also been discussed.
相似文献
19.
地球自转变化非潮汐项的冰期后地壳反弹解释 总被引：6，自引：0，他引：6
本文采用地球上四个最大的冰帽参数，计算了冰帽的融化对地球转动惯量的影响．根据冰期后地壳反弹理论，由现代天体测量空间技术观测资料分析得到的地球自转变化非潮汐项，估计给出了基于１０６６Ｂ地球模型的下地幔粘性系数为１．３５×１０（２２）≥Ｖ（ＬＭ）≤１．９１×１０（２２）Ｐａｓ．结果表明，用冰期后的地壳反弹理论和上述的地球下地幔粘性系数基本可以解释现代空间技术观测得到的地球自转变化中的非潮汐项． 相似文献
20.
Ram Gopal Vishwakarma 《Astrophysics and Space Science》2009,321(2):151-156
The mysterious ‘dark energy’ needed to explain the current observations, poses a serious confrontation between fundamental
physics and cosmology. The present crisis may be an outcome of the (so far untested) prediction of the general theory of relativity
that the pressure of the matter source also gravitates. In this view, a theoretical analysis reveals some surprising inconsistencies
and paradoxes faced by the energy-stress tensor (in the presence of pressure) which is used to model the matter content of
the universe, including dark energy.
相似文献