全文获取类型
收费全文 | 7626篇 |
免费 | 1507篇 |
国内免费 | 2287篇 |
专业分类
测绘学 | 863篇 |
大气科学 | 1291篇 |
地球物理 | 1874篇 |
地质学 | 4171篇 |
海洋学 | 1252篇 |
天文学 | 226篇 |
综合类 | 732篇 |
自然地理 | 1011篇 |
出版年
2024年 | 59篇 |
2023年 | 194篇 |
2022年 | 419篇 |
2021年 | 496篇 |
2020年 | 374篇 |
2019年 | 475篇 |
2018年 | 468篇 |
2017年 | 484篇 |
2016年 | 520篇 |
2015年 | 461篇 |
2014年 | 538篇 |
2013年 | 537篇 |
2012年 | 581篇 |
2011年 | 582篇 |
2010年 | 631篇 |
2009年 | 525篇 |
2008年 | 498篇 |
2007年 | 442篇 |
2006年 | 374篇 |
2005年 | 296篇 |
2004年 | 258篇 |
2003年 | 227篇 |
2002年 | 211篇 |
2001年 | 236篇 |
2000年 | 186篇 |
1999年 | 227篇 |
1998年 | 157篇 |
1997年 | 158篇 |
1996年 | 113篇 |
1995年 | 120篇 |
1994年 | 116篇 |
1993年 | 109篇 |
1992年 | 75篇 |
1991年 | 49篇 |
1990年 | 37篇 |
1989年 | 38篇 |
1988年 | 39篇 |
1987年 | 21篇 |
1986年 | 17篇 |
1985年 | 10篇 |
1984年 | 8篇 |
1983年 | 7篇 |
1982年 | 11篇 |
1981年 | 7篇 |
1980年 | 15篇 |
1979年 | 4篇 |
1976年 | 2篇 |
1958年 | 4篇 |
1954年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
Maritime network dynamics before and after international events 总被引:1,自引:0,他引:1
Investigating the influence of international events on global maritime networks is a challenging task that must comprehensively incorporate geographical, political, and maritime sciences. Understanding global maritime network dynamics is an initial and critical step in this investigation. This study proposes an automatic identification system (AIS)-based approach to understanding maritime network dynamics before and after international events. In this approach, a spatiotemporal modeling method is introduced to measure the similarity in shipping trends before and after international events. Then, a spatiotemporal analytic framework is proposed to understand the maritime network dynamics by grouping similar situation, and assessing possible indirect effects within a network. Finally, three case studies of international events, military conflict, lifted economic sanctions, and government elections, were used to investigate the observed network dynamics possibly affected by international events. The results indicate that container, tanker, and bulk shipping between India and its connected countries all declined more than 69% after military conflicts between India and Pakistan in August 2015. Tanker shipping between Iran and the United Arab Emirates increased 51% after economic sanctions on Iran were lifted. Container shipping between Sri Lanka and Singapore, Malaysia, and India increased more than 74% after the general election in Sri Lanka. These investigations demonstrate the feasibility of the proposed approach in assessing the possible effects of international events on maritime network dynamics. 相似文献
942.
Ng Jing Lin Abd Aziz Samsuzana Huang Yuk Feng Wayayok Aimrun Rowshon MK 《Theoretical and Applied Climatology》2018,133(1-2):489-509
Theoretical and Applied Climatology - A tropical country like Malaysia is characterized by intense localized precipitation with temperatures remaining relatively constant throughout the year. A... 相似文献
943.
The anomalous behavior of the western Pacific subtropical high(WPSH) in El Nio developing summer is studied based on the composite results of eight major El Nio events during 1979–2013. It is shown that the WPSH tends to retreat eastwards with weak intensity during the developing summer. The anomaly exhibits an intraseasonal variation with a weaker anomaly in June and July and a stronger anomaly in August, indicating that different underlying physical mechanisms may be responsible for the anomalous WPSH during early and late summer periods. In June and July, owing to the cold advection anomaly characterized as a weak northerly anomaly from high latitudes, geopotential height in East Asia is reduced and the WPSH tends to retreat eastwards slightly. By contrast, enhanced convection over the warm pool in August makes the atmosphere more sensitive to El Nio forcing. Consequently, a cyclonic anomaly in the western Pacific is induced, which is consistent with the seasonal march of atmospheric circulation from July to August. Accordingly, geopotential height in the western Pacific is reduced significantly, and the WPSH tends to retreat eastwards remarkably in August. Different from the developing summer, geopotential height in the decaying summer over East Asia and the western Pacific tends to enhance and extend northwards from June to August consistently, reaching the maximum anomaly in August. Therefore, the seasonal march plays an important role in the WPSH anomaly for both the developing and decaying summer. 相似文献
944.
945.
随着对光纤中非线性效应研究的不断深入,光纤分布式传感器得到了广泛的研究和应用.本文介绍了光纤传感的应用领域,综述了基于布里渊散射、拉曼散射及瑞利散射3种散射光实现不同类型光纤分布式传感的原理,最后从光纤分布式传感优势方面对其未来发展方向进行了展望. 相似文献
946.
1 SignificanceofSolarStokesSpectrumObservationDuetothedevelopmentinobservinginstrument,theconceptofsolarspectrumshouldbegeneralized .Inthepast,itisonlyassignedtotheordinaryorunpolarizedspectrumrecordingthewavelength distributedintensityofthecontinuumand… 相似文献
947.
全球变化与浙江洪水大势 总被引:4,自引:1,他引:3
根据历史和实测资料分析,对于全球变化下浙江近期洪水的运作大势,可得如下几点认识:(1)在未来的十几年之内,浙江省将处在枯水年占优势的阶段,但全球变化将使浙江洪水的时空变化更为剧烈,使沿海地区的洪水灾害更为严重。(2)由于浙江省的大中洪水一般都集中在太阳黑子活动的峰谷年前后,而近期的2004年和2009年分别是黑子活动第23周期的峰年和谷年,因此这两年前后必须予以足够的重视。(3)浙江洪水对厄尔尼诺现象具有较好的响应,因此厄尔尼诺同年或次年也必须引起足够的重视。(4)根据浙江历史上的台风重灾年资料,利用灰色灾变预测分析,可得浙江未来第一、第二和第三个台风重灾年分别为2001、2004和2008年,其中后两个台风重灾年与太阳黑子活动第23周期的峰年和谷年是大致吻合的。(5)植被破坏、河道设障等人类活动会产生一定的增灾效应,从而使浙江未来的洪水灾害更为严重。 相似文献
948.
949.
青藏高原中部岩石圈结构及地球动力学的天然地震学研究研究生吕庆田导师管志宁(应用地球物理系北京100083)青藏高原的隆升和地壳缩短被普遍认为是印度板块和欧亚板块碰撞的结果,然而对隆升和地壳缩短的机制和动力学过程仍不清楚。已提出的动力学模式可分为3类:... 相似文献
950.