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   209篇
  免费   10篇
  国内免费   3篇
测绘学   1篇
大气科学   16篇
地球物理   46篇
地质学   88篇
海洋学   20篇
天文学   39篇
综合类   1篇
自然地理   11篇
  2024年   1篇
  2023年   2篇
  2022年   2篇
  2021年   2篇
  2020年   5篇
  2018年   8篇
  2017年   3篇
  2016年   13篇
  2015年   11篇
  2014年   2篇
  2013年   15篇
  2012年   7篇
  2011年   19篇
  2010年   13篇
  2009年   17篇
  2008年   10篇
  2007年   11篇
  2006年   15篇
  2005年   7篇
  2004年   5篇
  2003年   8篇
  2002年   9篇
  2001年   5篇
  2000年   4篇
  1999年   3篇
  1998年   4篇
  1997年   2篇
  1996年   3篇
  1995年   1篇
  1994年   2篇
  1991年   1篇
  1988年   1篇
  1987年   1篇
  1985年   2篇
  1984年   2篇
  1983年   1篇
  1981年   1篇
  1980年   2篇
  1978年   1篇
  1973年   1篇
排序方式: 共有222条查询结果,搜索用时 15 毫秒
221.
On August 19, 2020, at 13:18—UTC, a meteor event ended as a meteorite shower in Santa Filomena, a city in the Pernambuco State, northeast Brazil. The heliocentric orbital parameters resulting from images by cameras of the weather broadcasting system were semimajor axis a = 2.1 ± 0.1 au, eccentricity e = 0.55 ± 0.03, and inclination i = 0.15o ± 0.05. The data identified the body as an Apollo object, an Earth-crossing object with a pericenter interior to the Earth's orbit. The chemical, mineralogical, and petrological evaluations, as well as the physical analysis, followed several traditional techniques. The meteorite was identified as a H5-6 S4 W0 ordinary chondrite genomict breccia. The large amount of metal in the meteorite made a metallographic evaluation based on the opaque phases possible. The monocrystalline kamacite crystals suggest a higher petrological type and the distorted Neumann lines imply at least two different shock events. The absence of the plessite phase shows that the meteorite did not reach the highest shock levels S5 and S6. The well-defined polycrystalline taenite is indicative of petrologic types 4 and 5 due to the conserved internal tetrataenite rim at the boundaries. The presence of polycrystalline taenites and the characteristics of the Agrell Effect suggest that the Santa Filomena meteorite did not reheat above 700°C. The absence of martensite confirms reheating temperatures <800°C and a slow cooling rate. The Ni contents and sizes of the zoned taenite particles indicate a slow cooling rate ranging from 1 to 10 K Myr−1.  相似文献   
222.
Featuring 3 000-km-long large and hot orogen, the Mantiqueira Province provides a rare opportunity to study the process of gravitational collapse at mid to deep crustal levels. Distinct but contemporary (~500 Ma) post-collisional intrusions show structures and anisotropy of magnetic susceptibility (AMS) fabrics related to their emplacements, recording different flow patterns. In southern deep-seated intrusions, ellipsoidal-shaped roots with gabbroic-to-hybrid cores surrounded by granitic rocks show concentric patterns of AMS fabrics that cut across the NE-trending regional foliation. In contrast, northern intrusions, exposed as the upper sections of batholith-size bodies of coarse-grained granite emplaced at the shallow to mid-crust, show general NS-trending magnetic fabrics roughly parallel to strike of the orogen and the regional foliation of host rocks. These contrasting magnetic patterns from shallow to deeper crust suggest vertical magma migration from the overthickened orogenic core to be emplaced across its thinner stretched flanks during the gravitational collapse of the orogenic edifice.  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