全文获取类型
收费全文 | 3839篇 |
免费 | 358篇 |
国内免费 | 870篇 |
专业分类
测绘学 | 244篇 |
大气科学 | 308篇 |
地球物理 | 1523篇 |
地质学 | 1726篇 |
海洋学 | 557篇 |
天文学 | 145篇 |
综合类 | 183篇 |
自然地理 | 381篇 |
出版年
2024年 | 21篇 |
2023年 | 68篇 |
2022年 | 52篇 |
2021年 | 88篇 |
2020年 | 60篇 |
2019年 | 76篇 |
2018年 | 93篇 |
2017年 | 39篇 |
2016年 | 78篇 |
2015年 | 81篇 |
2014年 | 100篇 |
2013年 | 99篇 |
2012年 | 181篇 |
2011年 | 258篇 |
2010年 | 121篇 |
2009年 | 112篇 |
2008年 | 214篇 |
2007年 | 223篇 |
2006年 | 217篇 |
2005年 | 203篇 |
2004年 | 200篇 |
2003年 | 165篇 |
2002年 | 163篇 |
2001年 | 150篇 |
2000年 | 158篇 |
1999年 | 112篇 |
1998年 | 109篇 |
1997年 | 102篇 |
1996年 | 98篇 |
1995年 | 99篇 |
1994年 | 102篇 |
1993年 | 135篇 |
1992年 | 140篇 |
1991年 | 131篇 |
1990年 | 123篇 |
1989年 | 105篇 |
1988年 | 99篇 |
1987年 | 73篇 |
1986年 | 60篇 |
1985年 | 59篇 |
1984年 | 57篇 |
1983年 | 28篇 |
1982年 | 32篇 |
1981年 | 27篇 |
1980年 | 40篇 |
1964年 | 6篇 |
1959年 | 7篇 |
1958年 | 15篇 |
1957年 | 11篇 |
1954年 | 6篇 |
排序方式: 共有5067条查询结果,搜索用时 218 毫秒
941.
根据室内外大量调查测试资料,对重庆市丰都县弹子台水库特殊的工程地质问题,进行了阐述和深入系统分析,所得结论为该水库的论证和设计提供了依据。 相似文献
942.
南极冰盖和冰帽的过去范围和将来稳定性是理解气候变化后果的主要依据,因为南极大陆的99%被冰覆盖,冰下侵蚀和搬运为大量陆源沉积物输送到海底提供了唯一的手段,在以前的冰川地形中,无论在陆地上还是海洋中,带状地貌形态与先前的冰流平行非常普遍,并且可用于重建古冰流方向。这种地形形成于运动的冰流之下,由于它出现于大约21ka的末次冰期极盛时,无论是岸上和浅海冰盖的全球范围和厚度都比目前大。从那时起,在南极西部冰盖失去了2/3的质量。冰川后退引起了陆地上和海底之上这种大规模构造的出露,它们或多或少地被后来地质作用重塑… 相似文献
943.
944.
Ronan Connolly Willie Soon Michael Connolly Sallie Baliunas Johan Berglund C. J. Butler Rodolfo Gustavo Cionco Ana G. Elias Valery M. Fedorov Hermann Harde Gregory W. Henry Douglas V. Hoyt Ole Humlum David R. Legates Nicola Scafetta Jan-Erik Solheim László Szarka Víctor M. Velasco Herrera Hong Yan Weijia Zhang 《天文和天体物理学研究(英文版)》2023,(10):369-388
Since 2007, the Intergovernmental Panel on Climate Change(IPCC) has heavily relied on the comparison between global climate model hindcasts and global surface temperature(ST) estimates for concluding that post-1950s global warming is mostly human-caused. In Connolly et al., we cautioned that this approach to the detection and attribution of climate change was highly dependent on the choice of Total Solar Irradiance(TSI) and ST data sets.We compiled 16 TSI and five ST data sets and found by alter... 相似文献
945.
For high-precision pulsar timing analysis and low-frequency gravitational wave detection, it is essential to accurately determine pulsar pulse times of arrival(ToAs) and associated uncertainties. To measure the ToAs and their uncertainties, various cross-correlation-based techniques can be employed. We develop methodologies to investigate the impact of the template-matching method, profile shape, signal-to-noise ratio of both template and observation on ToA uncertainties. These methodologies are... 相似文献
946.
本文通过分析目前限制城市地图服务的关键问题,设计一套城市大比例尺快速供图服务体系。该体系以1∶10000数字线划图为基础,通过对多源数据融合、改造、缩编,形成1∶10000地图数据库,并在此基础上缩编形成1∶25000、1∶50000、1∶100000、1∶200000 4个地图数据库,融合改造后的5个数据库可兼顾1∶5000~1∶280000尺度内的出图需求,通过配套生产、缩编及制图软件等,完成图件的制作。该体系成果已为四川省多个区县的政府部门提供服务,经过多次实践证明,该体系有效解决了临时用图需求下编辑繁琐、效率低下的问题,为应急及行业决策等常态化用图需求提供保障,提升了地图服务能力。 相似文献
947.
948.
Caurant F Aubail A Lahaye V Van Canneyt O Rogan E López A Addink M Churlaud C Robert M Bustamante P 《Marine environmental research》2006,62(2):131-148
Lead concentrations and isotopic composition have been measured in bone and teeth of small cetaceans belonging to three species (Delphinus delphis, Phocoena phocoena and Stenella coeruleoalba), to evaluate the toxicological risk and to determine sources of lead in the European waters. Lead concentrations, far lower than threshold value inducing toxic effects in human, were higher in teeth than in bones, but highly correlated between the two tissues (r=0.92, p<0.001). Large variations of 206Pb/207Pb values in bone tissue showed that cetaceans must be submitted to various atmospheric influences. No geographical differences appeared which is consistent with studies on their distribution indicating seasonal movements between Brittany waters and the Bay of Biscay. The negative correlation between 206Pb/207Pb ratios and age of the individuals reflected the decrease in the production of alkyl lead in Europe, i.e., the increasing use of unleaded gasoline. 相似文献
949.
Estuarine soft sediments support a diverse group of eukaryotic and prokaryotic organisms though the role of the sediment per se for the functioning of these organisms remains largely unknown. The present study aimed to test the effect of sediment grain size on the grazing activities of harpacticoid copepods. In controlled experiments, two common intertidal harpacticoid species (Paramphiascella fulvofasciata and Nitokra spinipes) were each offered a mix of two benthic diatom species (Navicula phyllepta and Seminavis robusta) in different sedimentary conditions. Several microcosms were created using a variety of sediment types, including fine silt (<63 microm), coarser grained sands (125-250, 250-450, 100-300 microm), artificial 'sediments' of glass beads (250-500, 2000 microm) and even the absence of sediment was tested. The diatoms were enriched in the stable carbon (13)C to facilitate tracing in the harpacticoids. Both copepod species were able to graze on the diatoms with highest uptake when sediment was absent. In contrast, both harpacticoid species showed no uptake in silty conditions. In general, grazing was favoured when mean sediment grain size increased. The strong negative effect of fine grains on the grazer's efficiency can be explained by the resulting differences in the structure (and accessibility) of the diatom biofilm on the one hand and the mobility of the grazer on the other hand. In view of the subtle equilibrium between primary producers and grazers, these results might have important implications for the effect of siltation of tidal flats due to, e.g., human activities. 相似文献
950.
1993年7~8月,湖北省咸宁地区发生了一系列ML≤4.1的地震。从地震系列、地表破坏状况和地震宏观等烈度线展布特征出发,深入研究了地震与地质构造及地下水动态变化的关系,得出结论地震群可能为抽取地下水引起的构造变动而诱发。 相似文献