全文获取类型
收费全文 | 2763篇 |
免费 | 572篇 |
国内免费 | 779篇 |
专业分类
测绘学 | 139篇 |
大气科学 | 797篇 |
地球物理 | 646篇 |
地质学 | 1498篇 |
海洋学 | 257篇 |
天文学 | 137篇 |
综合类 | 294篇 |
自然地理 | 346篇 |
出版年
2024年 | 7篇 |
2023年 | 58篇 |
2022年 | 145篇 |
2021年 | 117篇 |
2020年 | 94篇 |
2019年 | 125篇 |
2018年 | 129篇 |
2017年 | 120篇 |
2016年 | 151篇 |
2015年 | 136篇 |
2014年 | 182篇 |
2013年 | 182篇 |
2012年 | 154篇 |
2011年 | 156篇 |
2010年 | 170篇 |
2009年 | 141篇 |
2008年 | 136篇 |
2007年 | 130篇 |
2006年 | 105篇 |
2005年 | 99篇 |
2004年 | 69篇 |
2003年 | 61篇 |
2002年 | 67篇 |
2001年 | 84篇 |
2000年 | 99篇 |
1999年 | 157篇 |
1998年 | 134篇 |
1997年 | 141篇 |
1996年 | 132篇 |
1995年 | 129篇 |
1994年 | 107篇 |
1993年 | 81篇 |
1992年 | 59篇 |
1991年 | 60篇 |
1990年 | 39篇 |
1989年 | 36篇 |
1988年 | 32篇 |
1987年 | 19篇 |
1986年 | 16篇 |
1985年 | 14篇 |
1984年 | 13篇 |
1983年 | 10篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1974年 | 1篇 |
1962年 | 2篇 |
排序方式: 共有4114条查询结果,搜索用时 93 毫秒
941.
中国北方大陆下的地幔热柱与岩石圈运动 总被引:36,自引:1,他引:35
本文首次提出中国北方大陆下存在一个地幔热柱的论证,并提出亚热柱(sub—plume)的新概念。热柱的中心与边缘部分的隙间熔浆分别为苦橄质玄武岩与碱性玄武岩。在渐新世到中新世约18.4 Ma内,北方大陆以3.26cm/a的速率向东南飘移了约600km,使日本海、渤海—华北平原等脱离热柱。导致晚第三纪日本海扩张的停止,渤海—华北平原等早第三纪火山喷发的突然中止。火山喷发期间,在热柱头部若干个亚热柱的形成,好似若干个“铆钉”穿入岩石圈,有效地阻止了岩石圈的飘移(这时的飘移速率只有0.05cm/a),我们把火山喷发称为固定岩石圈的“铆钉效应”。 相似文献
942.
During the deformation of continental blocks, the magnitude of tectonic stress generally decreases with increasing distance from the margin of the block. However, the timing and kinematics of stress transmission from the margins to the interiors of continents are poorly resolved, even though this information is critical to our understanding of the dynamics of continental deformation. Here, we present a case study of Mesozoic deformation of the North China Craton (NCC). Field investigations of Mesozoic thrust faults and folds, granitic intrusions and dykes, combined with zircon SHRIMP and LA–ICP–MS dating and muscovite 40Ar/39Ar plateau ages, reveal the age of the NE–SW‐trending tectonic belts as ~180–155 Ma, where the deformation of the craton margin occurred 10–20 Ma earlier than that of the craton's interior. Although the kinematics of deformation are similar for the interior and the margin of the NCC, strain decreases with increasing distance from the margin. Notably, the bulk of the strain in the cratonic interior was focused in zones of pre‐existing weakness. Overall, we determined that the NCC deformed under conditions of uniaxial compression, a conclusion that is compatible with simple rheological models, and that the stress magnitude attained in the cratonic interior was much less than that along its margin. 相似文献
943.
Qi Luo Laiping Zhao Ce Yu Jian Xiao Jizhou Sun Ming Zhu Yi Zhong 《Experimental Astronomy》2018,45(1):107-126
A cost-efficient schedule for the Five-hundred-meter Aperture Spherical radio Telescope (FAST) requires to maximize the number of observable proposals and the overall scientific priority, and minimize the overall slew-cost generated by telescope shifting, while taking into account the constraints including the astronomical objects visibility, user-defined observable times, avoiding Radio Frequency Interference (RFI). In this contribution, first we solve the problem of maximizing the number of observable proposals and scientific priority by modeling it as a Minimum Cost Maximum Flow (MCMF) problem. The optimal schedule can be found by any MCMF solution algorithm. Then, for minimizing the slew-cost of the generated schedule, we devise a maximally-matchable edges detection-based method to reduce the problem size, and propose a backtracking algorithm to find the perfect matching with minimum slew-cost. Experiments on a real dataset from NASA/IPAC Extragalactic Database (NED) show that, the proposed scheduler can increase the usage of available times with high scientific priority and reduce the slew-cost significantly in a very short time. 相似文献
944.
945.
Yang Xiaoqian Wen Xin Zhou Chengxu Zhu Xiaojuan Meng Ran Luo Qijun Yan Xiaojun 《中国海洋湖沼学报》2018,36(5):1697-1706
Journal of Oceanology and Limnology - Typical harmful micro-algal species constantly occurred in high density in marine aquaculture ponds in Xiangshan and Sanmen Bay, Zhejiang Province. Fates of... 相似文献
946.
Baojing Gu Ying Ge Scott X. Chang Weidong Luo Jie Chang 《Global Environmental Change》2013,23(5):1112-1121
Identifying the sources of reactive nitrogen (N) and quantifying their contributions to groundwater nitrate concentrations are critical to understanding the dynamics of groundwater nitrate contamination. Here we assessed groundwater nitrate contamination in China using literature analysis and N balance calculation in coupled human and natural systems. The source appointment via N balance was well validated by field data via literature analysis. Nitrate was detected in 96% of groundwater samples based on a common detection threshold of 0.2 mg N L?1, and 28% of groundwater samples exceeded WHO's maximum contaminant level (10 mg N L?1). Groundwater nitrate concentrations were the highest beneath industrial land (median: 34.6 mg N L?1), followed by urban land (10.2 mg N L?1), cropland (4.8 mg N L?1), and rural human settlement (4.0 mg N L?1), with the lowest found beneath natural land (0.8 mg N L?1). During the period 1980–2008, total reactive N leakage to groundwater increased about 1.5 times, from 2.0 to 5.0 Tg N year?1, in China. Despite that the contribution of cropland to the total amount of reactive N leakage to groundwater was reduced from 50 to 40% during the past three decades, cropland still was the single largest source, while the contribution from landfill rapidly increased from 10 to 34%. High reactive N leakage mainly occurred in relatively developed agricultural or urbanized regions with a large population. The amount of reactive N leakage to groundwater was mainly driven by anthropogenic factors (population, gross domestic product, urbanization rate and land use type). We constructed a high resolution map of reactive N source appointment and this could be the basis for future modeling of groundwater nitrate dynamics and for policy development on mitigation of groundwater contamination. 相似文献
947.
948.
Spatial pattern reconstruction of regional habitat quality based on the simulation of land use changes from 1975 to 2010 总被引:3,自引:0,他引:3
Reconstruction of the spatial pattern of regional habitat quality can revivify the ecological environment background at certain historical periods and provide scientific support for revealing the evolution of regional ecological environmental quality.In this study,we selected 10 driving factors of land use changes,including elevation,slope,aspect,GDP,population,temperature,precipitation,river distance,urban distance,and coastline distance,to construct the CA-Markov model parameters and acquired the land use spatial data for 1975,1980,1985,1990,and 1995 by simulation based on the land use status map for 2010.On this basis,we used the InVEST model to reconstruct the spatial pattern of habitat quality in the study area and conducted classification division and statistical analysis on the computed habitat degradation degree index and the habitat quality index.(1)The results showed that from 1975 to 2010,the habitat degradation degree gradually increased,and the habitat degradation grade spatially presented a layered progressive distribution.Habitat quality presented a constantly decreasing trend.The high-value zones were mainly distributed in the mountainous areas,while the low-value zones were mostly located in built-up areas.During the period of 1975-2010,low-value zones gradually expanded to their surrounding high-value zones,and the high-value zones of habitat quality tended to be fragmented.(2)The spatial-temporal variation characteristics of habitat quality from 1975 to 2010 showed that the regions with low habitat quality were difficult to be restored and mostly maintained their original state;the regions with poor habitat quality,which accounted for 6.40%of the total study area,continued to deteriorate,mainly around built-up areas;the regions with good and superior habitat quality,which accounted for 5.68%of the total study area,were easily converted to regions with bad or poor habitat quality,thus leading to the fragmentation of the regional habitat.(3)From 1975 to 2010,land use changes in the study area were significant and had a huge influence on habitat quality;the habitat quality in the study area decreased consistently,and the area of the regions with bad and poor habitat quality accounted for more than 60%of the total study area.Construction land was the largest factor threatening habitat quality. 相似文献
949.
950.
2006年 9月17~22日在秭归泄滩镇西侧发生了一次极微震群活动,其中最大地震为9月20日21时10分 ML1.8级.分析结果表明:本次震群的震中主要集中于泄滩镇老石门村至老泄滩一线,震源深度为海平面以上0.5 km范围内,为正倾滑机制解;该震群频谱最佳频率主要集中在2 Hz左右,初步推断该震群为地表层重力作用下矿塌型地震并伴有几次浅层微滑坡. 相似文献