全文获取类型
收费全文 | 1344篇 |
免费 | 241篇 |
国内免费 | 229篇 |
专业分类
测绘学 | 58篇 |
大气科学 | 226篇 |
地球物理 | 381篇 |
地质学 | 693篇 |
海洋学 | 127篇 |
天文学 | 52篇 |
综合类 | 129篇 |
自然地理 | 148篇 |
出版年
2024年 | 5篇 |
2023年 | 17篇 |
2022年 | 42篇 |
2021年 | 48篇 |
2020年 | 45篇 |
2019年 | 53篇 |
2018年 | 59篇 |
2017年 | 56篇 |
2016年 | 80篇 |
2015年 | 68篇 |
2014年 | 82篇 |
2013年 | 75篇 |
2012年 | 73篇 |
2011年 | 71篇 |
2010年 | 76篇 |
2009年 | 68篇 |
2008年 | 59篇 |
2007年 | 50篇 |
2006年 | 55篇 |
2005年 | 37篇 |
2004年 | 34篇 |
2003年 | 56篇 |
2002年 | 86篇 |
2001年 | 71篇 |
2000年 | 68篇 |
1999年 | 59篇 |
1998年 | 45篇 |
1997年 | 37篇 |
1996年 | 43篇 |
1995年 | 42篇 |
1994年 | 35篇 |
1993年 | 24篇 |
1992年 | 21篇 |
1991年 | 17篇 |
1990年 | 11篇 |
1989年 | 11篇 |
1988年 | 14篇 |
1987年 | 9篇 |
1986年 | 3篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1981年 | 3篇 |
1978年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有1814条查询结果,搜索用时 140 毫秒
141.
142.
143.
颜色是钻石4C评估中的一个重要指标,也是决定钻石档次和价格的一个重要依据。作者结合实践体会对颜色分级条件进行了分析,并提出了注意要点。 相似文献
144.
145.
This study investigates the effect of a heat‐treatment upon the thermo‐mechanical behaviour of a model cement‐based material, i.e. a normalized mortar, with a (w/c) ratio of 0.5. First, a whole set of varied experimental results is provided, in order to either identify or validate a thermo‐mechanical constitutive model, presented in the second paper part. Experimental responses of both hydraulic and mechanical behaviour are given after different heating/cooling cycling levels (105, 200, 300, 400°C). The reference state, used for comparison purposes, is taken after mass stabilization at 60°C. Typical uniaxial compression tests are provided, and original triaxial deviatoric compressive test responses are also given. Hydraulic behaviour is identified simultaneously to triaxial deviatoric compressive loading through gas permeability Kgas assessment. Kgas is well correlated with volumetric strain evolution: gas permeability increases hugely when εv testifies of a dilatant material behaviour, instead of contractile from the test start. Finally, the thermo‐mechanical model, based on a thermodynamics approach, is identified using the experimental results on uniaxial and triaxial deviatoric compression. It is also positively validated at residual state for triaxial deviatoric compression, but also by using a different stress path in lateral extension, which is at the origin of noticeable plasticity. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
146.
This paper is devoted to micromechanical modeling of induced anisotropic damage in brittle geomaterials. The formulation of the model is based on a proper homogenization procedure by taking into account unilateral effects and interactions between microcracks. The homogenization procedure is developed in the framework of Eshelby's inclusion solution and Ponte‐Castaneda and Willis (J. Mech. Phys. Solids 1995; 43 :1919–1951) estimate. The homogenization technique is combined with the thermodynamics framework at microscopic level for the determination of damage evolution law. A rigorous crack opening–closure transition condition is established and an energy‐release‐rate‐based damage criterion is proposed. Computational aspects on the implementation of micromechanical model are also discussed. The proposed model is evaluated by comparing numerical predictions with experimental data for various laboratory tests on concrete. Parametric studies on unilateral effects and influences of microcracks interactions are finally performed and analyzed. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
147.
At the interface between the lower atmosphere and sea surface, sea spray might significantly influence air-sea heat fluxes and subsequently, modulate upper ocean temperature during a typhoon passage. The effects of sea spray were introduced into the parameterization of sea surface roughness in a 1-D turbulent model, to investigate the effects of sea spray on upper ocean temperature in the Kuroshio Extension area, for the cases of two real typhoons from 2006, Yagi and Soulik. Model output was compared with data from the Kuroshio Extension Observatory (KEO), and Reynolds and AMSRE satellite remote sensing sea surface temperatures. The results indicate drag coefficients that include the spray effect are closer to observations than those without, and that sea spray can enhance the heat fluxes (especially latent heat flux) considerably during a typhoon passage. Consequently, the model results with heat fluxes enhanced by sea spray simulate better the cooling process of the SST and upper-layer temperature profiles. Additionally, results from the simulation of the passage of typhoon Soulik (that passed KEO quickly), which included the sea spray effect, were better than for the simulated passage of typhoon Yagi (that crossed KEO slowly). These promising 1-D results could provide insight into the application of sea spray in general circulation models for typhoon studies. 相似文献
148.
陈吴敏 《国土资源导刊(湖南)》2015,(1):80-83
本文结合湖南省地理国情普查成果质量检查与验收的实际工作情况,根据相关标准规范,对改进和细化后的地理国情普查成果检查验收流程进行总结阐述。 相似文献
149.
150.