全文获取类型
收费全文 | 11384篇 |
免费 | 2736篇 |
国内免费 | 3641篇 |
专业分类
测绘学 | 2374篇 |
大气科学 | 1549篇 |
地球物理 | 2213篇 |
地质学 | 7340篇 |
海洋学 | 1892篇 |
天文学 | 160篇 |
综合类 | 841篇 |
自然地理 | 1392篇 |
出版年
2024年 | 119篇 |
2023年 | 283篇 |
2022年 | 663篇 |
2021年 | 845篇 |
2020年 | 642篇 |
2019年 | 805篇 |
2018年 | 708篇 |
2017年 | 734篇 |
2016年 | 646篇 |
2015年 | 789篇 |
2014年 | 779篇 |
2013年 | 900篇 |
2012年 | 993篇 |
2011年 | 936篇 |
2010年 | 908篇 |
2009年 | 863篇 |
2008年 | 871篇 |
2007年 | 775篇 |
2006年 | 757篇 |
2005年 | 662篇 |
2004年 | 545篇 |
2003年 | 447篇 |
2002年 | 641篇 |
2001年 | 587篇 |
2000年 | 345篇 |
1999年 | 165篇 |
1998年 | 60篇 |
1997年 | 66篇 |
1996年 | 41篇 |
1995年 | 23篇 |
1994年 | 25篇 |
1993年 | 11篇 |
1992年 | 18篇 |
1991年 | 13篇 |
1990年 | 15篇 |
1989年 | 7篇 |
1988年 | 14篇 |
1987年 | 6篇 |
1986年 | 8篇 |
1985年 | 3篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1980年 | 2篇 |
1979年 | 8篇 |
1977年 | 2篇 |
1965年 | 2篇 |
1963年 | 1篇 |
1958年 | 1篇 |
1957年 | 4篇 |
1954年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Zhi Xu Cheng Fang Wei-Qun Can Astronomy Department of Nanjing University Nanjing Purple Mountain Observatory Chinese Academy of Sciences Nanjing 《中国天文和天体物理学报》2005,5(5):519-530
Chromospheric lines, including Ha, Lyα, Lyβand CaⅡK, CaⅡ8542, are systemically and quantitatively investigated with respect to the non-thermal excitation and ionization due to particle beam bombardment for a series of solar semi-empirical atmospheric models. As a result we propose to use the contrast in the integrated intensity of hydrogen lines to estimate the total energy flux of the bombarding beam during the solar flare impulsive phase. Partial frequency redistribution is considered in the Lyαline calculation and a smaller intensity enhancement in the Ha line-centers is found than in the previous results of Fang et al. 相似文献
2.
Heat-shock protein 70 expression in shrimp Fenneropenaeus chinensis during thermal and immune-challenged stress 总被引:4,自引:0,他引:4
Using western immunoblotting, we obtained heat-shock protein 70 (HSP70) induction data and distribution in different tissues from shrimp Fenneropenaeus chinensis during thermal and immune-challenged stresses. This is probably the first report of the effects of various stressors on the expression of HSP70 in shrimp.HSP70 was prominently induced in hepatopancreas and gills, but not in muscle, eyestalk and hemolymph, when the shrimp were exposed to heat shock and Vibrio anguillavium-challenged stresses. Cold shock and WSSV treatment had no significant effects on the levels of HSP70 expression in all tissues examined. HSP70 induction was greatest after 2 h exposure to heat shock stress, which was elevated after acute heat shock exposure of 10℃ above ambient temperature. 相似文献
3.
GPS/LEO掩星观测的变分同化技术 总被引:6,自引:0,他引:6
在简单介绍GPS/LEO掩星探测大气的发展历史和科学意义之后,详细阐述了反演的基本原理;分析了标准反演中存在的问题,并说明一维变分同化(1DVAR)在反演方法中的重要性;给出了一维变分同化中价值函数的求解,以及各种同化因子;简单介绍了对当前气象学中普遍使用的四维变分同化(4DVAR);重点讨论了各种同化方法,以及使用各种同化因子的优缺点。最后,通过CHAMP卫星的观测实例分析,验证了GPS数据在数值天气预报(NWP)中的作用,以及相对于标准反演法一维变分对气象要素的改进。 相似文献
4.
The Tamtsag Basin is located in the extreme eastern portion of the Mongolia. The Basin and its counterpart in China (the Hailar Basin) are united a whole basin on the structural setting. In recent years, the Tamtsag Basin attracts more and more attention with the important exploration discovered in the 19th block by SOCO and in Hailar Basin of China. This paper discusses the exploration potential of Tamtsag Basin from the viewpoint of petroleum geology. 相似文献
5.
罗卫敏 《成都信息工程学院学报》2004,19(2):209-213
针对信息系统安全的考虑,介绍在PowerBuilder环境中对用户权限的具体控制. 相似文献
6.
本文讨论了彗星中尘埃粒子的充电机制 ,带电特性和平衡电势的变化规律 ,分析了彗星尘埃的破碎特性和临界半径 ,得出了很有意义的结果 相似文献
7.
1 INTRODUCTIONIn the previous paper (on et al. 1999, hereafter Paper I), we investigated the wavelength-dependence of four colltribution functions (CFs) derived from dmerent formal solutions andreferring to different emergellt quantities in the unpolarized case. Because one cannot generallyassign a single formation region to the whole line band in a real stellar atmosphere, e.g., the solaratmosphere, instead, the line formation region can be defined as the layers deviating farthestfrom t… 相似文献
8.
本文叙述南天区 5GHzVLBI普查中新发现的视超光速射电源 ,0 4 2 0— 0 1 4,1 334—1 2 7和 2 345— 1 67,这些结果尚待进一步的观测加以证实 相似文献
9.
There are more than 600 Cenozoic volcanic cones and craters with abeut 50 000 km2of lava flows in northeast China, which formed many volcanic clusters and shown the features of the continental rift - type volcanoes. Most volcanic activities in this area, especially in the east part of Songliao graben, were usually controlled by rifts and faults with the main direction of NE / NNE in parallel and become younger from the central graben towards its both sides, especially to the east continental margin. It is revealed that the volcanism occurred in northeast China was as strong as that occurred in Japan during the Miocene and the Quaternary. The Quaternary basalt that is usually distributed along river valley is called "valley basalt"while Neogene basalt usually distributed in the top of mounts is called "high position basalt". These volcanoes and volcanic rocks are usually composed of alkaline basalts with ultramafic inclusions, except Changbaishan volcano that is built by trachyte and pantellerite. 相似文献
10.
数字图像压缩方法在天文上的应用 总被引:1,自引:0,他引:1
概述了数字图像压缩技术在天文领域应用的必要性。针对天文观测的特点和研究的需要,经过研究、分析和比较,提出了天文图像压缩的可行方案。通过应用计算机编程及压缩实验并给出相应的结果。 相似文献