全文获取类型
收费全文 | 951篇 |
免费 | 37篇 |
国内免费 | 31篇 |
专业分类
测绘学 | 41篇 |
大气科学 | 18篇 |
地球物理 | 43篇 |
地质学 | 95篇 |
海洋学 | 16篇 |
天文学 | 741篇 |
综合类 | 26篇 |
自然地理 | 39篇 |
出版年
2024年 | 2篇 |
2023年 | 2篇 |
2022年 | 1篇 |
2021年 | 4篇 |
2020年 | 8篇 |
2019年 | 12篇 |
2018年 | 8篇 |
2017年 | 6篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 18篇 |
2013年 | 14篇 |
2012年 | 20篇 |
2011年 | 15篇 |
2010年 | 16篇 |
2009年 | 79篇 |
2008年 | 58篇 |
2007年 | 77篇 |
2006年 | 94篇 |
2005年 | 72篇 |
2004年 | 79篇 |
2003年 | 86篇 |
2002年 | 67篇 |
2001年 | 64篇 |
2000年 | 42篇 |
1999年 | 41篇 |
1998年 | 58篇 |
1997年 | 7篇 |
1996年 | 10篇 |
1995年 | 9篇 |
1994年 | 9篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1990年 | 7篇 |
1989年 | 5篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1984年 | 3篇 |
1981年 | 1篇 |
排序方式: 共有1019条查询结果,搜索用时 671 毫秒
131.
132.
Franz E. Schunck Burkhard Fuchs Eckehard W. Mielke 《Monthly notices of the Royal Astronomical Society》2006,369(1):485-491
A non-topological soliton model with a repulsive scalar self-interaction of the Emden type provides a constant-density core, similarly as the empirical Burkert profile of dark matter (DM) haloes. As a further test, we derive the gravitational lens properties of our model, in particular, the demarcation curves between 'weak' and 'strong' lensing. Accordingly, strong lensing with typically three images is almost three times more probable for our solitonic model than for the Burkert fit. Moreover, some prospective consequences of a possible flattening of DM haloes are indicated. 相似文献
133.
134.
135.
陆惠卿 《中国天文和天体物理学报》1988,(2)
本文讨论了宇宙常数Λ≠0时的平面引力波问题。在弱场近似下,得到了平面引力波传播方程及色散方程。通过对Kretschmann曲率标量的讨论发现,不同于Λ=0时h_(μv)仅有横场这一众所周知的结果,Λ<0时不存在一个坐标系,使h_(μv)的标量场、纵场、混合场分量全为零。最后讨论引力波辐射,结论是与Λ=0时无偶极辐射这一结果不同,Λ<0时,混合场的辐射有偶极辐射。 相似文献
136.
137.
138.
Paul J. Wiita 《Journal of Astrophysics and Astronomy》1981,2(4):387-403
Previous first-order analytic treatments of rotation acting upon stellar equilibria are extended to include later, post-Helium
burning, stages of stellar evolution. Strong differential rotation is capable of substantially increasing the photon luminosities
of post-main sequence stars, and thus accelerating their evolution. On the other hand, uniform rotation reduces the photon
flux for a wide range of stellar interior types and conditions. Similar conclusions are drawn regarding the effects of rotation
on the emission of neutrinos in pre-collapse phases of evolution. A brief discussion of the gravitational radiation emitted
during these phases is also given. 相似文献
139.
140.
Yu. P. Ilyasov M. Imae Y. Hanado V. V. Oreshko V. A. Potapov A. E. Rodin M. Sekido 《Astronomy Letters》2005,31(1):30-36
We present the results from our timing of the millisecond pulsar B1937+21, performed jointly since 1997 on two radio telescopes: the RT-64 in Kalyazin (Russia) at a frequency of 0.6GHz and RT-34 in Kashima (Japan) at a frequency of 2.15 GHz. The rms value of the pulse time of arrival (TOA) residuals for the pulsar at the barycenter of the Solar system is 1.8 μs (the relative variation is ≈10?14 over the observing period). The TOA residuals are shown to be dominated by white phase noise, which allows this pulsar to be used as an independent time scale keeper. The upper limit for the gravitational background energy density Ωgh2 at frequencies ≈6.5 × 10?9 Hz is estimated to be no higher than 10?6. Based on the long-term timing of the pulsar, we have improved its parameters and accurately determined the dispersion measure and its time variation over the period 1984–2002, which was, on average, ?0.00114(3) pc cm?3 yr?1. 相似文献