全文获取类型
收费全文 | 113篇 |
免费 | 28篇 |
国内免费 | 53篇 |
专业分类
测绘学 | 2篇 |
大气科学 | 57篇 |
地球物理 | 40篇 |
地质学 | 48篇 |
海洋学 | 30篇 |
天文学 | 7篇 |
综合类 | 3篇 |
自然地理 | 7篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 9篇 |
2016年 | 4篇 |
2015年 | 4篇 |
2014年 | 3篇 |
2013年 | 10篇 |
2012年 | 2篇 |
2011年 | 5篇 |
2010年 | 6篇 |
2009年 | 12篇 |
2008年 | 4篇 |
2007年 | 10篇 |
2006年 | 8篇 |
2005年 | 10篇 |
2004年 | 2篇 |
2003年 | 9篇 |
2002年 | 9篇 |
2001年 | 9篇 |
2000年 | 9篇 |
1999年 | 6篇 |
1998年 | 11篇 |
1997年 | 5篇 |
1996年 | 7篇 |
1995年 | 12篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 7篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
排序方式: 共有194条查询结果,搜索用时 984 毫秒
71.
长江三角洲夏季海陆风与热岛环流的相互作用及城市化的影响 总被引:25,自引:12,他引:25
用三维中尺度模式研究长江三角洲夏季海陆风与城市热岛环流的相互作用,白天由于东海海风和太湖湖风环流与上海市热岛环流相互增强,最大垂直速度可达6.2cm/s;夜间则相反,由于海风(包括长江江风)与湖风的对撞,因而在上海到江阴市沿江出现一条水平辐合带,如果上海周围地区随着经济发展,大片农田被城市下垫面所取代,而使绿地覆盖率下降到15%以下,则睡季夜间地面气温可上升3℃,两个增温中心分别在苏州和嘉兴附近, 相似文献
72.
Important role of the Geodynamo theory playing in the Study on the Earth's Deep Interior in discussed briefly. The study of geomanetic field and its temporal-spatial change is one of the main tools obtaining knowlege about the Earth's deep interior especialy the coer一mantle interabtion. It is the key to advancing the Geodynamo theory to bring to light implication of core-mantle, particularly thermal and chamical , interaction on the model of Geodynamo. 相似文献
73.
寒区冻土环境与工程环境间的相互作用 总被引:18,自引:6,他引:18
从冻土环境和工程环境相互作用着手 ,分析了青藏公路建设过程中的冻土环境破坏、环境保护状况及冻土环境保护对工程建设的重要性 ,同时对正在拟建的青藏铁路 ,阐述了人类经济活动对冻土环境和工程环境的影响 ,并初步提出寒区冻土、工程环境质量监测、管理和评价系统的设计框架. 相似文献
74.
75.
The dynamic interaction of adjacent buildings in cities and urban areas through the soil medium is inevitable. This fact has been confirmed by various analytical and numerical studies. However, very little research is available on the physical modelling of the Structure-Soil-Structure Interaction (SSSI) problem and its effect on the dynamics of adjacent structures. In this paper, a series of shaking table tests was conducted at the Earthquake and Large Structures Laboratory (EQUALS) at the University of Bristol to examine the effects of SSSI on the response of a model building when bordered by up to two other model buildings under dynamic excitation. The results indicated that depending on their height, the presence of one or two adjacent building could positively or negatively alter seismic power and peak acceleration responses of a building in comparison to when it is tested in isolation. 相似文献
76.
Analysis of the exchange of groundwater and river water by using Radon-222 in the middle Heihe Basin of northwestern China 总被引:9,自引:1,他引:8
In arid regions of western China, water resources come from mountain watersheds and disappear in the desert plain. The exchange of surface water and groundwater takes place two or three times in a basin. It is essential to analyze the interaction of groundwater with surface water to use water resources effectively and predict the change in the water environment. The conventional method of analysis, however, measures only the flow of a stream and cannot determine groundwater seepage accurately. As the concentration of Radon-222 (222Rn) in groundwater is much higher than in surface water, the use of 222Rn was examined as an indicator for the analysis of the interaction between surface water and groundwater. Measurement of the 222Rn concentration in surface water was conducted to detect groundwater seepage into a stream in the middle Heihe Basin of northwestern China. Furthermore, the simultaneous groundwater flow into and out of a stream from the aquifers was quantified by solving the 222Rn mass balance equation, in which the losses of gas exchange and radioactive decay of 222Rn are considered. Meanwhile, river runoff was gauged to determine the exchange rates between surface water and groundwater. The result shows that 222Rn isotope can be used as a good environmental tracer with high sensitivity for the interaction between surface water and groundwater, especially in the fractured aquifer system, karst aquifer system and discharge basins. 相似文献
77.
分析浅海物理环境与浮游生物动力学过程的互相影响,讨论相互作用过程在生态系模型中的定量化表示方法,探讨胶州湾的生态系统动力学特征。 相似文献
78.
79.
地基土-桩基础-核电站辅助厂房结构相互作用体系的地震响应分析 总被引:1,自引:0,他引:1
本文研究了地基土-桩-核岛辅助厂房结构相互作用体系在地震激励时的“平-扭”耦联动力响应,在分析中分别采用M.Novak的近似理论,M.Novak常数法,M法,常数法计算了桩基础的阻抗函数,并考虑了在同一基础上的安全壳和另一辅助厂房对所研究的辅助厂房动力响应的影响。 相似文献