全文获取类型
收费全文 | 10105篇 |
免费 | 2244篇 |
国内免费 | 723篇 |
专业分类
测绘学 | 283篇 |
大气科学 | 91篇 |
地球物理 | 7458篇 |
地质学 | 3060篇 |
海洋学 | 514篇 |
天文学 | 25篇 |
综合类 | 464篇 |
自然地理 | 1177篇 |
出版年
2024年 | 15篇 |
2023年 | 73篇 |
2022年 | 236篇 |
2021年 | 306篇 |
2020年 | 370篇 |
2019年 | 449篇 |
2018年 | 349篇 |
2017年 | 346篇 |
2016年 | 296篇 |
2015年 | 357篇 |
2014年 | 459篇 |
2013年 | 557篇 |
2012年 | 550篇 |
2011年 | 578篇 |
2010年 | 481篇 |
2009年 | 571篇 |
2008年 | 599篇 |
2007年 | 717篇 |
2006年 | 732篇 |
2005年 | 609篇 |
2004年 | 612篇 |
2003年 | 528篇 |
2002年 | 441篇 |
2001年 | 340篇 |
2000年 | 358篇 |
1999年 | 304篇 |
1998年 | 290篇 |
1997年 | 238篇 |
1996年 | 275篇 |
1995年 | 212篇 |
1994年 | 202篇 |
1993年 | 180篇 |
1992年 | 113篇 |
1991年 | 70篇 |
1990年 | 51篇 |
1989年 | 54篇 |
1988年 | 46篇 |
1987年 | 32篇 |
1986年 | 26篇 |
1985年 | 8篇 |
1984年 | 4篇 |
1982年 | 2篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1979年 | 16篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1954年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
341.
In this study the inelastic behavior of steel arch bridges subjected to strong ground motions from major earthquakes is investigated by dynamic analyses of a typical steel arch bridge using a three‐dimensional (3D) analytical model, since checking seismic performance against severe earthquakes is not usually performed when designing such kinds of bridge. The bridge considered is an upper‐deck steel arch bridge having a reinforced concrete (RC) deck, steel I‐section girders and steel arch ribs. The input ground motions are accelerograms which are modified ground motions based on the records from the 1995 Hyogoken‐Nanbu earthquake. Both the longitudinal and transverse dynamic characteristics of the bridge are studied by investigation of time‐history responses of the main parameters. It is found that seismic responses are small when subjected to the longitudinal excitation, but significantly large under the transverse ground motion due to plasticization formed in some segments such as arch rib ends and side pier bases where axial force levels are very high. Finally, a seismic performance evaluation method based on the response strain index is proposed for such steel bridge structures. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
342.
Seismic tests have been conducted on two 3‐storey structures protected with pressurized fluid‐viscous spring damper devices. One of the structures was a reinforced concrete frame with clay elements in the slabs, while the other one was a steel frame with steel/concrete composite slabs. The spring dampers were installed through K bracing in between the floors. The tests were performed by means of the pseudodynamic method, which allowed the use of large and full‐size specimens, and by implementing a specific compensation strategy for the strain‐rate effect at the devices. The test results allowed the verification of the adequacy of the attachment system as well as the comparison of the behaviour of the unprotected buildings with several protected configurations, showing the benefits of the application of the devices and the characteristics of their performance. The response of the protected structures was always safer than that of the unprotected ones mainly due to a significant increase of equivalent damping. The increase in the damping ratio depends on the level of deformation. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
343.
344.
345.
地震动作用下滑坡稳定性分析 总被引:2,自引:0,他引:2
李忠生 《水文地质工程地质》2004,31(2):4-8
应用地震危险性分析理论和地震动人工合成技术,给出Newmark法中所需的地震动时程。通过滑坡实例计算,得出了坡体中地震动峰值加速度与深度存在负指数关系;坡体对地震动放大倍数与坡体厚度近似呈线性关系。通过对Ne wmark法中不同地震动时程作用位置的计算对比,发现使用地面地震动时程得到的结果虽有些偏于安全,但基本是合理的。 相似文献
346.
347.
本文以动三轴试验和原位测试数据为基础,以天津地区砂性土为例,探讨砂性土振动液化机理及孔隙水压力变化规律,采用多种方法分析判别砂性土液化,为高烈度地区重要工程建筑抗震设计提供重要数据。 相似文献
348.
The Zhangjiakou–Penglai seismotectonic zone (ZPSZ) lies in the northern part of North China and extends along the Zhangjiakou–Beijing–Tianjin–Bohai Bay–Penglai–Yellow Sea. It is about 900 km long and some 250 km wide in a northwest direction. The great Sanhe-Pinggu (MS=8.0) earthquake occurred on September 1679 and the Tangshan (MS=7.8) earthquake on July 1976 caused serious economic and life losses. According to some differences in crust structure and regional tectonic stress field, the ZPSZ is divided into western and eastern segment by the 117°E line for study on long-term seismic hazard analysis. An analysis of Gutenberg–Richter's empirical relation of earthquake-frequency and time process of historic and recent earthquakes along the eastern and western segments shows that the earthquake activity obeys a Poisson process, and these calculations indicate that the earthquake occurrence probability of MS=6.0–6.9 is 0.77–0.83 in the eastern segment and the earthquake occurrence probability of MS=7.0–7.9 is 0.78–0.80 in the western segment of the ZPSZ during a period from 2005 to 2015. 相似文献
349.
Management of Historical Seismic Data Using GIS: The Island of Ischia (Southern Italy) 总被引:1,自引:0,他引:1
This paper presents the results of the use of Geographic Information Systems (GIS) inmanaging information on the effects of earthquakes in historical times on the island ofIschia. The unpublished sources on the Casamicciola earthquake of 28 July 1883 andthe extensive bibliography documenting the island's seismicity from 1228 showed theneed to proceed towards a type of data storage that would also allow management ofthe same data. Application of GIS techniques allowed us to insert, extract, handle,manage and analyse the data for the zoning of seismic damage on the island of Ischia.The end-product consists of information layers, such as maps of isoseismals, the damage, and hazard involved, as well as numerical tables associated to maps.The study was developed using GIS Arc-View 3.2 software (ESRI) and is structured inthematic vectorial levels and rasters. The overlapping themes constitute a cartographicdata base of the island. The damaged sites are located on a map at a scale of 1:10,000,with all the information on the 1883 earthquake (total number of houses, number ofcollapsed houses, collapsed or damaged rooms, photographs, plans of buildings, etc.)being associated to each site. The GIS is structured in such a way as to be able to beintegrated with further georeferenced data and with other databases. It is thus able toprovide support both for in-depth analyses of the dynamic processes on the island andextend the assessment to other natural risks (volcanic, landslides, flooding, etc.). 相似文献
350.
While laboratory and analytical studies can provide valuable information about earthquake hazard mitigation, the most effective educator is the impact of a full-scale earthquake on a full-scale city. The recent earthquakes in Turkey showed that the governmental as well as individual attitudes towards earthquakes did not represent proportionate responses to the risk levels concerned. Turkey had weaknesses in preparing, planning, mitigating and responding to disasters in spite of the known seismic vulnerability of the country. Many steps have been taken after 1999 earthquakes in Turkey, however, the preparations largely concentrate on the response and recovery phases and a fundamental step to reform the current disaster management system and steps to rehabilitate the vulnerable building stock has not been undertaken until today. This would involve changing the present laws and regulations and de-centralising the disaster management system. The aim of this paper is to propose a national mitigation strategy for Turkey for a time-frame of 10 years. The model proposed is a very comprehensive model for earthquake risk reduction in Turkey and within this context, the legislative and technical aspects of mitigation will be discussed in detail. Strategies for mitigating and retrofitting the existing building stock will also be proposed. 相似文献