全文获取类型
收费全文 | 613篇 |
免费 | 186篇 |
国内免费 | 177篇 |
专业分类
测绘学 | 117篇 |
大气科学 | 201篇 |
地球物理 | 154篇 |
地质学 | 242篇 |
海洋学 | 60篇 |
天文学 | 48篇 |
综合类 | 55篇 |
自然地理 | 99篇 |
出版年
2023年 | 9篇 |
2022年 | 33篇 |
2021年 | 36篇 |
2020年 | 31篇 |
2019年 | 33篇 |
2018年 | 22篇 |
2017年 | 47篇 |
2016年 | 53篇 |
2015年 | 43篇 |
2014年 | 27篇 |
2013年 | 53篇 |
2012年 | 48篇 |
2011年 | 30篇 |
2010年 | 37篇 |
2009年 | 41篇 |
2008年 | 32篇 |
2007年 | 33篇 |
2006年 | 31篇 |
2005年 | 32篇 |
2004年 | 30篇 |
2003年 | 20篇 |
2002年 | 27篇 |
2001年 | 12篇 |
2000年 | 23篇 |
1999年 | 29篇 |
1998年 | 17篇 |
1997年 | 27篇 |
1996年 | 22篇 |
1995年 | 16篇 |
1994年 | 15篇 |
1993年 | 13篇 |
1992年 | 12篇 |
1991年 | 10篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 7篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1980年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有976条查询结果,搜索用时 15 毫秒
31.
A numerical study of mechanical behavior of a cement paste under mechanical loading and chemical leaching 下载免费PDF全文
Based on relevant experimental data of a petroleum cement paste under mechanical loading and chemical leaching, an elastic‐plastic model is first proposed by taking into account plastic shearing and pore collapse. The degradation of mechanical properties induced by the chemical leaching is characterized by a chemical damage variable which is defined as the increase of porosity. Both elastic and plastic properties of the cement paste are affected by the chemical damage. The proposed model is calibrated from and applied to describe mechanical responses in triaxial compression tests respectively on sound and fully leached samples. In the second part, a phenomenological chemical model is defined to establish the relationship between porosity change and calcium dissolution process. The dissolution kinetics is governed by a diffusion law taking into account the variation of diffusion coefficient with calcium concentration. The chemical model is coupled with the mechanical model, and both are applied to describe mechanical response of cement paste samples subjected to progressive chemical leaching and compressive stresses. Comparisons between experimental data and numerical results are presented. 相似文献
32.
青藏高原和亚洲夏季风动力学研究的新进展 总被引:4,自引:1,他引:3
亚洲夏季风环流受海陆和伊朗高原—青藏高原大地形的热力作用调控.亚洲季风所释放的巨大潜热又对大气环流形成反馈.这种相互反馈过程十分复杂,揭示其物理过程对理解气候变化格局的形成和变化以及提高天气预报及气候预测的准确率十分重要.夏季北半球副热带对流层上层环流的主要特征是存在庞大的南亚高压(SAH)以及强大的对流层上层温度暖中心(UTTM).本文介绍了温度—加热垂直梯度(T-QZ)理论的发展,并用以揭示SAH和UTTM的形成机制.指出沿副热带欧亚大陆东部的季风对流潜热加热及其中西部的表面感热加热和高层长波辐射冷却是导致SAH和UTTM在南亚上空发展的原因.文中还介绍了Gill模型用于上部对流层研究的局限性及解决的办法. 相似文献
33.
Geospatial services with different functions are assembled together to solve complex problems. Different taxonomies are developed to categorize these services into classes. As differences in granularity and semantics exist among these taxonomies, the identification of services across different taxonomies has become a challenge. In this paper, an approach to identify geospatial services across heterogeneous taxonomies is proposed. Using formal concept analysis, existing heterogeneous taxonomies are decomposed into semantic factors and their various combinations. With these semantic factors, a super taxonomy is established to integrate the original heterogeneous taxonomies. Finally, with the super taxonomy as a cross-referencing system, geospatial services with classes in original taxonomies are identifiable across taxonomies. Experiments in service registries and a social media-based spatial-temporal analysis project are presented to illustrate the effectiveness of this approach. 相似文献
34.
Hongguang Jiang Xuecheng Bian Chong Cheng Yunmin Chen Renpeng Chen 《Acta Geotechnica》2016,11(2):231-242
Ballastless high-speed railways have dynamic performances that are quite different from those of conventional ballasted railways. The essential dynamic characteristics of high-speed railways due to passing train wheels, such as the cyclic effect, moving effect, and speed effect, were put forward and discussed. A full-scale accelerated railway testing platform for ballastless high-speed railways was proposed in this study. The feasibility of the sequential loading method in simulating train moving loads, and the boundary effect of the proposed physical model of ballastless railways, was investigated using three-dimensional finite element models. A full-scale physical model, 5 m long, 15 m wide, and 6 m high, was then established according to practical engineering design methods. Using a sequential loading system composed of eight high-performance hydraulic actuators, loads of a moving train with highest speed of 360 km/h were simulated. Preliminary experimental results of vibration velocities were presented and compared with field measurements of the Wuguang high-speed railway in China. Results showed that the experimental results coincided with the field measurements, demonstrating that the full-scale accelerated railway testing platform can simulate the process of a moving train and realistically reproduce the dynamic behaviors of ballastless high-speed railways. 相似文献
35.
36.
东特提斯喜马拉雅在中生代位于东冈瓦纳大陆的结合部位,其古地理对于了解东冈瓦纳大陆裂解至关重要.对东特提斯喜马拉雅塔嘎地区沉积地层进行了详细的碎屑锆石U-Pb年代学研究.结果表明,东特提斯喜马拉雅塔嘎地区采样剖面沉积下限为126.6±2.7 Ma.碎屑锆石年龄谱显示东特提斯喜马拉雅塔嘎地区采样地层主要包含~520 Ma、~890 Ma和~1 200 Ma的特征峰值年龄,对比结果表明东特提斯喜马拉雅塔嘎地区沉积地层碎屑锆石年龄谱与印度东部和澳大利亚西南部地层碎屑锆石年龄谱具有一定的相似性.结合东冈瓦纳岩浆活动记录以及该剖面下部玄武岩年龄,东特提斯喜马拉雅塔嘎地区地层沉积于东特提斯喜马拉雅从东冈瓦纳大陆分离时期,其物质来源可能为印度东部、澳大利亚西南部以及南极大陆. 相似文献
37.
38.
39.
40.
川西北早志留世陆源碎屑──碳酸盐混积缓坡 总被引:10,自引:6,他引:10
研究区位于扬子地块西北缘,由一套巨厚的页岩、泥岩层夹生物礁及透镜状和不规则层状风暴生屑灰岩、瘤状灰岩组成。根据区内特征的岩石类型及其组合、分布和相应的化石生态,作者认为本区兰多维列期至早温洛克期时为一典型的陆源碎屑--碳酸盐混积均斜缓坡,并且从浅到深划分为滨岸、浅缓坡、深缓坡及盆地等亚环境。滨岸区位于潮间带,以潮坪碳酸盐岩为代表;浅缓坡位于浪基面至风暴浪基面之间,岩性组合为A、B类风暴岩,A、B类瘤状灰岩、生物礁灰岩及粘结岩;深缓坡位于风暴浪基面至最大风暴浪基面之间,岩性以D、E类风暴岩、C类瘤状灰岩及泥页岩组合为特征;盆地处于最大风暴浪基面之下,为黑色泥页岩沉积。结合早志留世时全球冰川作用,文中讨论了海平面变化的原因及对环境的影响。 相似文献