全文获取类型
收费全文 | 617篇 |
免费 | 122篇 |
国内免费 | 241篇 |
专业分类
测绘学 | 13篇 |
大气科学 | 56篇 |
地球物理 | 233篇 |
地质学 | 504篇 |
海洋学 | 106篇 |
天文学 | 6篇 |
综合类 | 51篇 |
自然地理 | 11篇 |
出版年
2020年 | 1篇 |
2016年 | 2篇 |
2015年 | 24篇 |
2014年 | 1篇 |
2013年 | 38篇 |
2012年 | 13篇 |
2011年 | 119篇 |
2010年 | 84篇 |
2009年 | 101篇 |
2008年 | 19篇 |
2007年 | 38篇 |
2006年 | 44篇 |
2005年 | 62篇 |
2004年 | 83篇 |
2003年 | 51篇 |
2002年 | 35篇 |
2001年 | 28篇 |
2000年 | 26篇 |
1999年 | 28篇 |
1998年 | 14篇 |
1997年 | 36篇 |
1996年 | 22篇 |
1995年 | 15篇 |
1994年 | 11篇 |
1993年 | 32篇 |
1992年 | 20篇 |
1991年 | 14篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1984年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有980条查询结果,搜索用时 15 毫秒
51.
库米什盆地的硝酸盐型钾盐矿床 总被引:1,自引:0,他引:1
库米什盆地的硝酸盐型钾盐矿床,是利用~(40)K具有放射性特点,通过航空、地面伽玛能谱测量发现的。本文介绍了具有代表性C矿床的一般地质特征,总结了乌尊布拉克硝酸盐型钾盐矿床地质特征。矿床按其赋存状态可分为固体矿和卤水矿两类。水硝碱镁矾为最主要的工业矿物,共生矿物有钾硝石、钠硝石、杂卤石、芒硝、钠镁矾、石膏、石盐、极少量的泻利盐等。 相似文献
52.
53.
The favourable synoptic situation and climate background for a sandstorm process,which occurred in theperiod 9—16 April 1988,have been studied through analyzing weather maps,meteorological elements,satellitecloud pictures and sandstorm trajectories.The sand dust origin area,the directions and the paths of sanddust transport,and the extent the sand dust reached are also investigated.The results of measurments andanalysis indicate that the concentration of sand dust particles is 10 times greater than the normal.It is also shownthat the elements in the sand dust are lithophylic and come from natural source through the chemical composi-tion analysis of the sand dust,so that the sand dust has not been polluted by human activities. 相似文献
54.
NUMERICAL EXPERIMENT OF THE INFLUENCES OF HEAT AND WIND STRESS ON THE EQUATORIAL OCEAN CIRCULATION 总被引:1,自引:0,他引:1 下载免费PDF全文
A time-dependent linear model on the equatorial beta plane is developed in this paper.Its verticalstructure consists of two active layers with equal density and temperature above the thermocline and aquasi-stationary layer with constant density below the thermocline.The results of nurnericat experiments show that the direct influence of heat on the equatorial ocean ismuch smaller than that of wind stress.Nevertheless,through the tropical ocean-atmosphere interaction,the change of wind stress resulting from the thermal forcing may set a determinant effect on the equilibriumand anomalous development of the ocean-almosphere circulation. 相似文献
55.
海底热液活动研究进展迅速,热液矿化作用已成为当前国际地球科学最为活跃的研究领域之一。本文叙述了:(1)热液调查新技术、新方法、矿床赋存状态、主要类型以及热液矿化作用的研究进展:(2)当前国际研究的热点,包括海底热液矿床和构造岩浆背景、热液流体形成和金属浸析作用、热液沉淀过程中的金属分馏作用、热液排放与大洋的质重平衡等。最后强调加强海洋地球科学国内外合作的必要性。 相似文献
56.
华北地区重力场与沉积层构造 总被引:12,自引:2,他引:12
位于中朝准地台的华北地区是由几个不同的断块组成的,重力异常场的分布具有很强的浅部效应、块状分布和深浅叠加场的特点。重力的高程效应很复杂,不同波长的起伏变化有不同的影响系数。本文对布格改正的有关问题进行了讨论,指出华北如区表浅层的密度值偏低(2520kg/m3),该区合理的布格改正公式为△g2=-0.0879H。将重力场的垂直导数和向上延拓结合起来,有利于揭示地壳上部构造特征。本文搜集整理了由第四系到寒武系的沉积层资料,给出了沉积层总厚度和视密度的分布。对深部重力异常的分析表明,华北沉积层的形成有深源性质,在均衡调节中起着一定的内载荷作用。 相似文献
57.
This paper discusses the Cretaceous-Tertiary magnetic polarity sequence of the the Hengyang Basin on the basis of magnetostratigraphic study. The age of each stratigraphic unit has been determined with the magnetic polarity time scale combined with 39Ar/40Ar dating, thus providing evidence for determining the geological ages of different formations. The authors assign the age of the Dongjing Formation of the Hengyang Basin to Early Cretaceous, the Shenhuangshan Formation to Early-Late Cretaceous, the Daijiaping Formation to Late Cretaceous, and the Dongtang and Xialiushi formations to Palaeocene. 相似文献
58.
59.
JIANG Yao-hui YANG Wanzhi State Key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing Nanjing Institute of Geology Mineral Resources Ministry of Land Resource. Nanjing Xinjian 《Continental Dynamics》2001,(2)
l. IntroductionGranite distributes widely in western KunlunMts. Many researches have been conducted byscientists (Wang Yuzhen et.al., l987; Zhang Yuquanet.al., l989, Fang Xilian et.al., I990, Jiang Chunfaet.al., 1992; Pan Yusheng, l992, Xu Ronghua et.al.,l 994; Jing Daogui et.al., l996, Zhang Yuquan et.al.,l998). But all of the researches have been donealong Sino-Pakistan road and Xinjiang-Tibet roadt"ith fOcus on isotopic dating of the intrusion andconducted a few on origin and tect… 相似文献
60.
A global two-dimensional chemistry model is developed to study long-term trends of CH_4 sinceindustrial revolution.The sources of CH_4,CO and NO_x are parameterized as functions of latitudeand time.With two long-term emission scenarios,long-term trends of CH_4 are simulated.The resultshave a good agreement with observation from ice cores.The modeled CH_4 increased from 760 ppbvin 1840 to 1611.9 ppbv in 1991, while the modeled number concentration of tropospheric OHdecreased from 7.17×10~5 cm~(-3)in 1840 to 5.79×10~5 cm~(-3) in 1991.The increase of atmosphericCH_4 can be explained by the increase of emission of CH_4 and build-up because of decrease of OHradicals that remove CH_4 from the atmosphere.The model is also used to simulate the distribution of CH_4.Comparisons between the modelresults and observations show that the model can simulate both latitudinal distribution and seasonalvariation of CH_4 well. 相似文献