全文获取类型
收费全文 | 10546篇 |
免费 | 1829篇 |
国内免费 | 2408篇 |
学科分类
地球科学 | 14783篇 |
出版年
2024年 | 38篇 |
2023年 | 178篇 |
2022年 | 401篇 |
2021年 | 468篇 |
2020年 | 386篇 |
2019年 | 452篇 |
2018年 | 470篇 |
2017年 | 463篇 |
2016年 | 579篇 |
2015年 | 459篇 |
2014年 | 599篇 |
2013年 | 555篇 |
2012年 | 532篇 |
2011年 | 535篇 |
2010年 | 639篇 |
2009年 | 537篇 |
2008年 | 528篇 |
2007年 | 491篇 |
2006年 | 378篇 |
2005年 | 379篇 |
2004年 | 290篇 |
2003年 | 302篇 |
2002年 | 277篇 |
2001年 | 334篇 |
2000年 | 342篇 |
1999年 | 538篇 |
1998年 | 477篇 |
1997年 | 432篇 |
1996年 | 444篇 |
1995年 | 377篇 |
1994年 | 317篇 |
1993年 | 310篇 |
1992年 | 254篇 |
1991年 | 200篇 |
1990年 | 160篇 |
1989年 | 130篇 |
1988年 | 131篇 |
1987年 | 66篇 |
1986年 | 61篇 |
1985年 | 46篇 |
1984年 | 32篇 |
1983年 | 24篇 |
1982年 | 37篇 |
1981年 | 32篇 |
1980年 | 22篇 |
1979年 | 20篇 |
1978年 | 7篇 |
1976年 | 9篇 |
1973年 | 5篇 |
1958年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
法国GUERET花岗岩内黑云母的结构特征研究 总被引:3,自引:0,他引:3
应用形态数学、图象分析及立体学原理,通过岩石薄片研究,对Gueret花岗岩内黑云母的结构特征进行了定量分析,揭示了黑云母矿物粒子在花岗岩中的密度、粒径、形状及空间分布的规律。根据岩石薄片上黑云母的灰度特征,应用直接成象方法获得其灰度图象,用自动阈值方法可用来提取黑云母粒子从而构成二值图象。借助MIPS图象分析系统,可以评价花岗岩薄片样本图象中所有黑云母粒子的参数,包括面积、周长等。花岗岩内黑云母矿物的密度、粒径 形状及空间分布的分析,揭示了其各向异性特征;同时,威布尔、正态及泊橙模型可分别用来描述黑云母矿物的粒径、形状及空间分布特征。 相似文献
32.
33.
34.
研究区自加里东期运动以来,经历了复杂的构造-岩浆-热演化过程。在分析岩浆活动特征及其形成的构造环境的基础上,探讨了研究区沉积岩系及其中有机质的热变质作用。 相似文献
35.
36.
山西省主要河流流域面雨量预报业务流程 总被引:3,自引:1,他引:3
以T213、HLAFS模式、MM5中尺度模式输出的格点资料以及日本降水量格点资料为基础,将影响山西降水的天气动力模型归纳为诊断模型,从中引出多个能够全面反映降水模型特征的综合物理因子;根据各种数值模式输出的降水量预报性能和质量优劣特点,依据数值模式的形势场预报优于要素场预报的现实,构造在不同环流形势背景下,启动不同预报方程的面雨量预报业务流程,有效地遏止了在环流形势调整时预报输出不能快速响应的弱点,提高了点和面雨量预报的准确度。 相似文献
37.
大厂矿区一条长1.5km的运输巷道内进行了高精度磁测找矿试验,并进行了地质钻探验证。结果表明:在将局部磁性干扰压抑后,所获相对磁异常是可以取得找矿效果的。 相似文献
38.
Fu-yuan Wu Simon A. Wilde Guang-liang Zhang De-you Sun 《Journal of Asian Earth Sciences》2004,23(5):781
Northeastern (NE) China is a well-documented example of a collisional zone characterized by widespread post-orogenic granites and mafic–ultramafic complexes. Based on a study of the Hongqiling and Piaohechuan Cu–Ni sulfide-bearing mafic–ultramafic complexes in central Jilin province, we present geological, petrological, geochemical and geochronological data which indicates their post-orogenic origin.The Hongqiling complex comprises pyroxenite, olivine websterite, lherzolite, gabbro and leucogabbro. Zircon U–Pb SHRIMP analyses on a leucogabbro of the Hongqiling complex yield a weighted mean 206Pb–238U age of 216±5 Ma. The Piaohechuan complex is composed of gabbro, pyroxenite and dolerite, exposed as dikes. A plagioclase-bearing pyroxenite has a U–Pb zircon weighted mean 206Pb–238U age of 217±3 Ma, identical to that of the Hongqiling complex. These ages are coeval with the emplacement of A-type granites in the area, but slightly younger than the regional metamorphism (240 Ma) and syn-orogenic granitic magmatism (246±4 Ma). This suggests that these mafic–ultramafic complexes are post-orogenic in origin. The age data also indicated a short period of lithospheric stabilization of about 30 Ma after cessation of orogenic activity.Geochemical investigation indicates that the primary mafic magma was a lithospheric mantle-derived basalt resulting from the upwelling of asthenosphere due to lithospheric delamination during post-orogenic processes. The magmatic source was contaminated by a small amount of crustal material, and subsequent crystal fractionation resulted in the Cu–Ni mineralization.The widespread occurrence of mafic–ultramafic complexes in the Xing'an–Mongolian Orogenic Belt of NE China and in the Altay–Tianshan–Junggar Orogenic Belt of Northern Xinjiang indicates that mafic intrusions are an important magmatic suite that evolved during post-orogenic processes. Portions of this mafic magma could have underplated the lower crust, and served as the heat source for associated late-stage granitic magmas. 相似文献
39.
We perform a global statistical investigation into the problem of Coulomb stress triggering of earthquakes by using the Harvard CMT catalogue of shallow earthquakes from 1976 to 2001. We consider ‘earthquake pairs’, i.e., pairs of successive earthquakes occurring near each other with similar focal mechanisms, and address the problem of whether or not the change of the Coulomb failure stress (CFS) produced by the first earthquake of the pair ‘encourages’ the occurrence of the second one. An interesting feature is that such a Coulomb stress-triggering phenomenon has an apparent focal mechanism dependence: for thrust earthquakes, a more evident triggering effect can be observed. 相似文献
40.
Chen-Tung Arthur Chen Jiunn-Tzong Wu Bing-Jye Wang Kuo-Ming Huang 《Aquatic Geochemistry》2004,10(1-2):33-57
One hundred and eighty lakes, ponds and reservoirs in Taiwan, and the offshore islands have been investigated since 1985. Effects such as warming/cooling, mixing, photosynthesis and respiration on pH have been identified. These effects were found to be less profound than those resulting from the geology. Since there is little rain or lake water pH data available prior to 1970, it was necessary to use proxy data in order to ascertain the history of lake acidification. In this study, we present data based on diatoms in a sediment core collected from a lake in the remote subalpine region of southern Taiwan. The acidity of this lake water was found to have increased since 1900. We measured the concentrations of 55 chemical species in lake water samples. In addition, concentrations of 26 chemical species were obtained from sediments. Conductivity, alkalinity (HCO3 ?), most other major and minor chemical species, as well as the non sea-salt SO4/Na ratio in lake water clearly decrease with elevation. Distribution of pH is similar, although the trend is less clear. Distribution of trace metals, however, shows a different trend as anthropogenic pollution, diagenetic reduction and lake acidification are at play. 相似文献