全文获取类型
收费全文 | 21632篇 |
免费 | 3290篇 |
国内免费 | 1966篇 |
专业分类
测绘学 | 3864篇 |
大气科学 | 1203篇 |
地球物理 | 9018篇 |
地质学 | 5705篇 |
海洋学 | 1204篇 |
天文学 | 105篇 |
综合类 | 1572篇 |
自然地理 | 4217篇 |
出版年
2024年 | 46篇 |
2023年 | 198篇 |
2022年 | 653篇 |
2021年 | 807篇 |
2020年 | 840篇 |
2019年 | 951篇 |
2018年 | 655篇 |
2017年 | 772篇 |
2016年 | 753篇 |
2015年 | 841篇 |
2014年 | 1063篇 |
2013年 | 1310篇 |
2012年 | 1270篇 |
2011年 | 1312篇 |
2010年 | 975篇 |
2009年 | 1150篇 |
2008年 | 1269篇 |
2007年 | 1488篇 |
2006年 | 1468篇 |
2005年 | 1187篇 |
2004年 | 1167篇 |
2003年 | 1028篇 |
2002年 | 874篇 |
2001年 | 690篇 |
2000年 | 654篇 |
1999年 | 550篇 |
1998年 | 537篇 |
1997年 | 419篇 |
1996年 | 397篇 |
1995年 | 331篇 |
1994年 | 310篇 |
1993年 | 258篇 |
1992年 | 163篇 |
1991年 | 105篇 |
1990年 | 89篇 |
1989年 | 81篇 |
1988年 | 69篇 |
1987年 | 49篇 |
1986年 | 38篇 |
1985年 | 16篇 |
1984年 | 10篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 4篇 |
1980年 | 5篇 |
1979年 | 16篇 |
1977年 | 4篇 |
1954年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
中国台湾地区地处欧亚板块与菲律宾海板块之间,地震活动频繁.本文报道了 我国台湾地区及其邻近海域1985~2002年间5.5级以上地震的条带内外频度比分 布,并着重研究了1999—2002年中发生的3次7.5级以上地震前的条带现象.其结 果表明:台湾地区近期发生的3次7.5级以上大地震前,5.5级以上地震呈条带分 布.这些条带符合条带内地震个数Nin≥6的条件,符合条带内、外频度比Nin/(Nin Nout)≥75%的条件,也符合条带长宽比大于5的要求,只是与板内地震条带相比,条 带的长度较短. 相似文献
72.
海底油气集输管网可靠性评估 总被引:1,自引:0,他引:1
对海底油气集输管网进行了可靠性评估,提出了一种适用于树状海底油气集输管网可靠性评价的方法,将流可靠度和单元重要度的概念引入到海底油气集输管网可靠性的分析中,该方法能够有效地评价海底油气集输管网的可靠性。 相似文献
73.
D. C. Mason I. J. Davenport R. A. Flather C. Gurney G. J. Robinson J. A. Smith 《Estuarine, Coastal and Shelf Science》2001,53(6):759
A sensitivity analysis of the waterline method of constructing a Digital Elevation Model (DEM) of an intertidal zone using remote sensing and hydrodynamic modelling is described. Variation in vertical height accuracy as a function of beach slope is investigated using a set of nine ERS Synthetic Aperture Radar (SAR) images of the Humber/Wash area on the English east coast acquired between 1992 and 1994. Waterlines from these images are heighted using a hydrodynamic tide-surge model and interpolated using block kriging. On 1:500 slope beaches, an average block height estimation standard deviation of 18–22 cm is achieved. This rises to 27 cm on 1:100 slope beaches, and 32 cm on 1:30 slope beaches. The average heighting error at different slopes is decomposed into components due to waterline heighting error, inadequate sensor resolution and interpolation inaccuracy. It is shown that, at 1:500 slope, waterline heighting error and interpolation inaccuracy are the main error sources, whilst at 1:30 slope, errors due to inadequate sensor resolution become dominant. The ability of the technique to generate intertidal DEMs for almost the entire coastal zone in a complete ERS SAR scene covering 100×100 km is demonstrated. 相似文献
74.
在综合的科学考察船上以异步通讯口实现的IBM-PC局部网具有较好的性能价格比。本文介绍了该网的联网环境、网络系统的组成及其拓扑结构、网络的服务功能以及网络软、硬件的安装和配置。 相似文献
75.
76.
可靠性约束下的海底油气集输管网系统优化 总被引:1,自引:0,他引:1
在管网系统满足一定可靠度的基础上,以费用最小为优化目标,对系统进行了优化,求出了满足一定可靠度指标的费用最小的管网布置方案。对树状网络可靠性进行了评估,提出了一个0-l规划模型,并运用图论和网络理论将管网系统的优化问题转变为求可靠度至少为α的网络固的最小生成树问题。 相似文献
77.
78.
Crustal Structures of the Northernmost South China Sea: Seismic Reflection and Gravity Modeling 总被引:2,自引:0,他引:2
The South China Sea (SCS) is a marginal sea off shore Southeast Asia. Based on magnetic study, oceanic crust has been suggested in the northernmost SCS. However, the crustal structure of the northernmost SCS was poorly known. To elaborate the crustal structures in the northernmost SCS and off southwest Taiwan, we have analyzed 20 multi-channel seismic profiles of the region. We have also performed gravity modeling to understand the Moho depth variation. The volcanic basement deepens southeastwards while the Moho depth shoals southeastwards. Except for the continental margin, the northernmost SCS can be divided into three tectonic regions: the disturbed and undisturbed oceanic crust (8–12 km thick) in the southwest, a trapped oceanic crust (8 km thick) between the Luzon-Ryukyu Transform Plate Boundary (LRTPB) and Formosa Canyon, and the area to the north of the Formosa Canyon which has the thickest sediments. Instead of faulting, the sediments across the LRTPB have only displayed differential subsidence offset of about 0.5–1 s in the northeast side, indicating that the LRTPB is no longer active. The gravity modeling has shown a relatively thin crust beneath the LRTPB, demonstrating the sheared zone character along the LRTPB. However, probably because of post-spreading volcanism, only the transtension-shearing phenomenon of volcanic basement in the northwest and southeast ends of the LRTPB can be observed. These two basement-fractured sites coincide with low gravity anomalies. Intensive erosion has prevailed over the whole channel of the Formosa Canyon. 相似文献
79.
1 .IntroductionNowadays tremendous efforts have been devotedtothe analysis of randomseismic responses .Forexample ,American PetroleumInstitute (API) has declared that the analysis of randomseismic re-sponsesis a useful tool for safety inspection. Owing to the complexity of platformand randomness ofload,it is difficult to carry out the randomresponse analysis of a jacket platform. The conventionalrandomvibration methods ,such as square root of the sumof squares (SRSS) and complete quadratic… 相似文献
80.