全文获取类型
| 收费全文 | 14325篇 |
| 免费 | 2808篇 |
| 国内免费 | 2605篇 |
专业分类
| 测绘学 | 717篇 |
| 大气科学 | 1088篇 |
| 地球物理 | 4371篇 |
| 地质学 | 6607篇 |
| 海洋学 | 1956篇 |
| 天文学 | 2016篇 |
| 综合类 | 716篇 |
| 自然地理 | 2267篇 |
出版年
| 2024年 | 33篇 |
| 2023年 | 153篇 |
| 2022年 | 408篇 |
| 2021年 | 444篇 |
| 2020年 | 504篇 |
| 2019年 | 569篇 |
| 2018年 | 492篇 |
| 2017年 | 518篇 |
| 2016年 | 555篇 |
| 2015年 | 599篇 |
| 2014年 | 711篇 |
| 2013年 | 665篇 |
| 2012年 | 759篇 |
| 2011年 | 851篇 |
| 2010年 | 689篇 |
| 2009年 | 1014篇 |
| 2008年 | 928篇 |
| 2007年 | 1009篇 |
| 2006年 | 991篇 |
| 2005年 | 848篇 |
| 2004年 | 854篇 |
| 2003年 | 851篇 |
| 2002年 | 681篇 |
| 2001年 | 631篇 |
| 2000年 | 616篇 |
| 1999年 | 542篇 |
| 1998年 | 590篇 |
| 1997年 | 344篇 |
| 1996年 | 314篇 |
| 1995年 | 312篇 |
| 1994年 | 284篇 |
| 1993年 | 230篇 |
| 1992年 | 198篇 |
| 1991年 | 124篇 |
| 1990年 | 84篇 |
| 1989年 | 84篇 |
| 1988年 | 57篇 |
| 1987年 | 67篇 |
| 1986年 | 39篇 |
| 1985年 | 21篇 |
| 1984年 | 5篇 |
| 1983年 | 5篇 |
| 1982年 | 4篇 |
| 1981年 | 5篇 |
| 1980年 | 7篇 |
| 1979年 | 12篇 |
| 1978年 | 4篇 |
| 1977年 | 7篇 |
| 1976年 | 5篇 |
| 1954年 | 14篇 |
排序方式： 共有10000条查询结果，搜索用时 400 毫秒
81.
张小波 《广东海洋大学学报》2004,24(5):70-74
通过对辜鸿铭所翻译的《中庸》、《论语》进行分析和研究 ,反映出社会背景对中国古典文化经典翻译的不同策略的影响。从而证明辜鸿铭译文的别出心裁出于强势语下的无奈。从翻译理论上揭示归化翻译的历史意义以及译品存在的价值。 相似文献
82.
S.W. Allen 《Astrophysics and Space Science》2003,285(1):247-256
Chandra X-ray observations of rich, dynamically relaxed galaxy clusters allow the properties of the X-ray gas and the total
gravitating mass to be determined precisely. Here, we discuss how Chandra observations may be used as a powerful tool for
cosmological studies. By combining Chandra X-ray results on the X-ray gas mass fractions in clusters with independent measurements
of the Hubble constant and the mean baryonic matter density of the universe, we obtain a tight constraint on the mean total
matter density of the universe, Οm, and an interesting constraint on the cosmological constant, ΟΛ. Using these results, together with the observed local X-ray luminosity function of the most X-ray luminous galaxy clusters,
a mass-luminosity relation determined from Chandra and ROSAT X-ray data and weak gravitational lensing observations, and the
mass function predicted by numerical simulations, we obtain a precise constraint on the normalization of the power spectrum
of density fluctuations in the nearby universe,σ8. We compare our results with those obtained from other, independent methods.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
83.
We describe how a local plasma structure can be changed by a transverse shear flow using numerical simulation to investigate the disturbance process near the magnetopause. The results show that magnetic field lines are bent by transverse shear flow disturbance near the current sheet region. There are multiple bipolar structures of the normal magnetic field in the numerical simulation. We term this new feature as K-point magnetic reconnection, realistic for discussing space observations. 相似文献
84.
85.
1IntroductionOne of the key factors related to basin geody-namics is deep process controlling formation and evolution of sedimentary basin. Depth and tempera-ture of asthenosphere,existence of mantle plume,occurrence of mantle melting,and amounts of melts under depressurization during thinning of lithosphere are controlling factors influenced formation and characteristics of extensional basin directly (Li,1994). Rifting is probably governed by frictional forces exerted on the base of litho… 相似文献
86.
87.
1INTRODUCTION Since the first use in human genetic research in1966,allozyme has become the most popular genetic marker for population genetics studies for almost all groups of animals and plants(Lewontin and Hubby,1966;Murphy et al.,1996).In the past seve… 相似文献
88.
89.
辽宁东、西部地质上诸多差异并非是原地升降运动造成的，而是二个异地岩块经郯庐断裂大规模左旋平移运动迁移到一起的结果。辽东半岛原曾与鲁西－徐淮地区处于相同的古纬度。郯庐断裂北延的主干断裂应是抚顺－敦化断裂，它在辽宁境内是地层区划的重要界线。郯庐断裂在太古宙末期即已出现，曾多次变换其平移方向，最近一次大规模左行平移活动的高峰期是在晚侏罗世晚期－早白垩世，结束于孙家湾组或泉头组堆积之前。 相似文献
90.
D. Kilkenny L. A. Crause F. van Wyk 《Monthly notices of the Royal Astronomical Society》2005,361(2):559-564
A new statement of the eigenvalue problem of studying small perturbations in arbitrary integrable self-gravitating systems is presented. An example of such a system, a 2D stellar disc, is considered in detail. The theory, based on the general equation for disc eigenmodes, reveals mechanisms for the formation and growth of global galactic structures. This new point of view specifies the limits of the unified theory of bar-like and spiral modes that was based on the assumption that global galactic structures could be understood in terms of low-frequency disc modes. 相似文献