首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   52373篇
  免费   12266篇
  国内免费   19270篇
测绘学   9841篇
大气科学   6822篇
地球物理   9659篇
地质学   35415篇
海洋学   9917篇
天文学   596篇
综合类   4064篇
自然地理   7595篇
  2024年   659篇
  2023年   1683篇
  2022年   3416篇
  2021年   4144篇
  2020年   3310篇
  2019年   3919篇
  2018年   3267篇
  2017年   3087篇
  2016年   3301篇
  2015年   3766篇
  2014年   3587篇
  2013年   4298篇
  2012年   4989篇
  2011年   4836篇
  2010年   4832篇
  2009年   4542篇
  2008年   4339篇
  2007年   4056篇
  2006年   3993篇
  2005年   3236篇
  2004年   2378篇
  2003年   1683篇
  2002年   1765篇
  2001年   1644篇
  2000年   1297篇
  1999年   567篇
  1998年   191篇
  1997年   127篇
  1996年   108篇
  1995年   80篇
  1994年   69篇
  1993年   71篇
  1992年   82篇
  1991年   30篇
  1990年   51篇
  1989年   28篇
  1988年   37篇
  1987年   40篇
  1986年   61篇
  1985年   36篇
  1984年   52篇
  1983年   35篇
  1982年   35篇
  1981年   13篇
  1979年   39篇
  1978年   14篇
  1976年   11篇
  1975年   8篇
  1957年   18篇
  1954年   29篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
李保廷 《山西地震》2005,(Z1):36-37
社会发展包括社会经济、政治及文化进步的诸多方面,它与地震灾害带来的损失有着密切的关系.  相似文献   
992.
Introduction The anisotropy of the Earth crust medium is a common phenomenon(Crampin,1984).More and more observation materials and study results have proved that on most of the Earth′s upper crust is spread fluid-filled cracks and microcracks,which are aligned according to the contempo-rary stress-field.Such distributions of aligned cracks show effectively anisotropy to seismic wave and the phenomenon is called extensive-dilatancy anisotropy(EDA)(Crampin et al,1984).At the same time,it is …  相似文献   
993.
Introduction Ready and Renkin (1971) were the first to make the research on anisotropy problems in magnetotellurics (MT). The progress in the research is not evident because it is more complex and difficult than isotropic problems. Now, the one-dimensional (1D) anisotropy problems in MT have been well solved, while for the two-dimensional (2D) cases, the numerical solutions have only been obtained for some particular conditions (Ready and Renkin, 1975). As to the three-dimensional (3D) ani…  相似文献   
994.
运用地震活动标度ΔF对大华北地区MS≥6.0级地震震前资料进行时间扫描,结果表明,地震活动标度ΔF大多在震前1~2年出现超出一倍均方差的异常;运用该方法还对河南及邻区ML≥5.0级地震震前资料进行了探索,同样,中等地震震前也有一定的异常反映。  相似文献   
995.
This paper proposes a basic equation of thermal radiation interaction between surface objects on the basis of the principle of heat balance in the interface. The solution of this equation takes account of the contribution of sensible heat flux and latent heat flux more completely, compared with traditional solution for surface cooling and heating processes. By the aid of the experimental data conducted in the Xiaotangshan experimental site, Beijing, both the non-applicability of Kirchoff's law and the measurability of surface emissivity in a non-isothermal system have been highlighted. Two methods called ventilation and time-delay compensations have been proposed to reduce the error induced by change of surface temperatures of non-isothermal objects during the measurement of emissivity. Based on the solution of the basic equation, this paper has analyzed and pointed out the misunderstanding in comprehension and application of Kirchoff's law published in literature.  相似文献   
996.
Succeeding to multiply collisions of different blocks in Late Paleozoic[1―5], complex intracontinental structural deformation occurred in the Tianshan area during Mesozoic-Cenozoic[6―16], which controlled coeval basin-range evolution and resulted in intensive modi- fication and adjustment of the Paleozoic oil-gas reser- voirs[17―19]. The Kuqa Depression is a secendary struc- tural unit of the Tarim basin, in which Mesozoic- Ce- nozoic deposits occur in thickness of 6000―7000 m. The Kuq…  相似文献   
997.
Clastic sedimentary rocks record a number of in-formation about the compositions and paleoweathering conditions of the source areas, and the tectonic setting of the depositional basin[1―6]. The traditionallypetrological study commonly utilizes the major com-ponents (Quartz, Feldspar and Lithics) of the silici-clastic sedimentary rocks to investigate the source rock composition and tectonic setting[7]. However, thepetrological method is somewhat limited, because many of the mafic components f…  相似文献   
998.
The Kuoerzhenkuola gold field (including the Kuo- erzhenkuola and the Buerkesidai gold deposits), lo- cated 68 km east of Jimunai County in northern Xing- jiang, China, is an important component of the Sawuer gold belt which is the eastward extending part of the Zarma-Sawur gold-copper belt in Kazakhstan. Some studies are concerned with the geology of the gold ores[1―3], the associated volcanic rocks[4], radiogenic isotope[5―8], and the ore-forming environment[8]. Most researchers inferr…  相似文献   
999.
A large amount of nuclear wastes has been pro-duced due to nuclear weapon development and nuclear electricity generation. One possible resolution for the disposal of the nuclear wastes is to seal them in an underground repository, which requires detailed knowledge on the mobility, chemical behavior and immobilization of radionuclides in underground water. In addition, toxic heavy metals are extensively present in ground and underground water, how to immobilize and remedy these toxic heavy meta…  相似文献   
1000.
Isotopic evidence of TSR origin for natural gas bearing high H2S contents 1961 As the hazardous component of natural gas, the ex-istence of H2S, due to its extremely strong toxicity and corrosivity, not only decreases the percentage of hy-drocarbon gas within natural gas and reduces its in-dustrial value, it also threatens each aspect of drilling and exploitation. It frequently causes serious safety accidents[1] and leads to the E&P cost and risk of natural gas with higher H2S contents be…  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号