全文获取类型
收费全文 | 4995篇 |
免费 | 957篇 |
国内免费 | 1068篇 |
专业分类
测绘学 | 188篇 |
大气科学 | 1139篇 |
地球物理 | 1438篇 |
地质学 | 2431篇 |
海洋学 | 445篇 |
天文学 | 275篇 |
综合类 | 492篇 |
自然地理 | 612篇 |
出版年
2024年 | 30篇 |
2023年 | 101篇 |
2022年 | 238篇 |
2021年 | 287篇 |
2020年 | 224篇 |
2019年 | 252篇 |
2018年 | 294篇 |
2017年 | 277篇 |
2016年 | 281篇 |
2015年 | 236篇 |
2014年 | 299篇 |
2013年 | 271篇 |
2012年 | 289篇 |
2011年 | 292篇 |
2010年 | 285篇 |
2009年 | 289篇 |
2008年 | 247篇 |
2007年 | 244篇 |
2006年 | 170篇 |
2005年 | 182篇 |
2004年 | 142篇 |
2003年 | 115篇 |
2002年 | 128篇 |
2001年 | 127篇 |
2000年 | 159篇 |
1999年 | 239篇 |
1998年 | 181篇 |
1997年 | 186篇 |
1996年 | 168篇 |
1995年 | 156篇 |
1994年 | 107篇 |
1993年 | 126篇 |
1992年 | 81篇 |
1991年 | 58篇 |
1990年 | 30篇 |
1989年 | 56篇 |
1988年 | 44篇 |
1987年 | 24篇 |
1986年 | 15篇 |
1985年 | 14篇 |
1984年 | 16篇 |
1983年 | 7篇 |
1982年 | 12篇 |
1981年 | 8篇 |
1980年 | 8篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1958年 | 9篇 |
排序方式: 共有7020条查询结果,搜索用时 15 毫秒
291.
Leiming Ma 《地球科学进展》1986,35(6):551-560
Numerical weather prediction, which is the major basis of current weather forecast, has some shortcomings, such as the understanding of the law of atmospheric motion, the assimilation and application of observation data, the expression of model physics, etc., leading to the forecast error of weather. The rapid development of artificial intelligence technology in recent years provides a new possibility for the advancement and innovation of weather forecast. In this paper, the background of the development of artificial intelligence, the current situation of the application of artificial intelligence technology to weather forecast and the future development trend are mainly described to account for this possibility. After that, the idea for development of weather forecast technology based on the integration of artificial intelligence and numerical forecast is put forward. Particularly, this study stresses that, in order to advance the AI algorithm of weather forecast in the future, it is requested to focus on the nonlinear and chaotic characteristics of atmospheric motion leading to the uncertainty of forecast. Starting from the essence of mathematics and physics, we need to realize the hybrid modeling of mathematics and physics, not only to establish the framework of input-output mapping, but also to provide solutions to the bottleneck problems of weather forecast. 相似文献
292.
我国地震的现今地球动力学研究的进展与方向 总被引:2,自引:0,他引:2
本文从活动构造、大陆地壳形变与现代地壳运动、地震活动区与大震震源区的深部探测及动力学、大陆强震区的地壳介质结构与地震成因、构造的物理及数值模拟、大陆岩石圈动力学以及地球动力学模型研究七个方面扼要介绍了近年来我国开展的与地震有关的现今地球动力学研究进展和取得的一系列新认识以及研究动向。在此基础上提出了微动态地球动力学,上地幔的非均匀性、深浅部构造关系及其动力学和地球动力学模型的理论研究三个应该优先发展的研究领域。 相似文献
293.
294.
准噶尔盆地第三纪磁性地层柱的建立 总被引:2,自引:2,他引:2
通过对新疆准噶尔盆地第三系3个剖面古地磁样品的分析、测试,在生物地层学研究的基础上,建立了一条较为完整的第三纪磁性地层柱,标定了各组地质年代,为在不同盆地进行对比,提供了新的依据。 相似文献
295.
1994年2月16日共和5.8级地震短临预报实况 总被引:5,自引:0,他引:5
本文真实地再了1994年2月16日青海共和5.8级地震前前兆异常的发展过程及对该地震的短临预报过程,同时系统地分析了前兆异常在时间,空间及种数上的分布特征。指出,在有一定前兆监测能力的地区,对一些较大地震作出一定的或成功的短临预报是有希望的。 相似文献
296.
297.
冻土蠕变过程中结构的CT分析 总被引:5,自引:1,他引:5
CT为非破坏的持续检测和定量描述不同实验条件下试样的内部结构提供了可能,本文利用这一手段观测分析了冻土蠕变过程结构的变化情况,认为冻土蠕变过程中所进行的发育微裂隙、颗粒集合体的破坏以及其它结构缺陷的增生与扩展,制约着土结构的强化与弱化作用,控制着蠕变过程的形态特征,同时还给出了CT值与物密度和含水量之间的定量关系。 相似文献
298.
本文是1:400万“中国及邻近海域岩石圈动力学图”说明书的节要。它对我国现今活动着或在新生代活动过的地质和地球物理作用过程作了综合概括,重点是板内现象,并从板块构造作用基本过程上对它们加以解释。 中国的岩石圈很不均匀。其动力学涉及8个活动亚板块和有关的17个构造块体的性质、它们的相对运动和构造应力场、以及新构造变形的特征。阐明了我国岩石圈现今运动和变形 相似文献
299.
We have compared the Haicheng foreshock sequence with several earthquake swarms which occurred in its neighborhood. The spatial distribution of the earthquakes is relatively concentrated. For the most part, the events occurred within a few kilometers of each other. The focal mechanisms are comparatively stable. However, there are several swarms in which the variations of focal mechanisms are quite obvious after the occurrence of the largest event of the sequence, which would allow it to be recognized as a swarm. However, there are also swarms whose focal mechanisms are no less stable throughout the sequence compared to the Haicheng foreshock sequence. This feature could thus not be used to identify a foreshock sequence. The temporal distributions of foreshocks and swarms are quite similar in some cases. This is again not a definite criterion for identifying foreshocks, but is worthy of further study. Thus, no definite criterion for identifying foreshock sequences has been found. However, some earthquake swarms may be recognized in their later stage.Finally, we introduced a magnitude sequence with gaps which can be used to see whether a large event is still forthcoming. This method (in conjunction with other methods) could be used in areas prone to large earthquakes, immediately before a large event, to improve the probability of predicting the occurrence of a large event. We also report that the temporal distribution of all the sequences showed a 12-hour recurrence pattern that corresponded with the earth tides, indicating that tidal forces might be influencing foreshocks and earthquake swarm occurrence. 相似文献
300.
By utilizing the magnetic interactions possessingC 3v symmetry, the author has deduced the general expressions for theg-factors, zero-field splitting and effective magnetic moment of the ground singlet orbital state in d3-complex. For ruby (Al2O3: Cr3+) the results are in good agreement with experiments: theoretical values:g ‖ =1.9835;g ⊥=1.9876; 2D=?0.3731 cm?1;μ ‖ =3.857β;μ ⊥=3.861β; experimental values:g ‖ =1.9840±0.006,g ⊥=1.9867±0.0006, 2D=?0.3831±0.0002 cm?1,μ=3.8?3.9β. 相似文献