全文获取类型
收费全文 | 1654篇 |
免费 | 335篇 |
国内免费 | 407篇 |
专业分类
测绘学 | 84篇 |
大气科学 | 461篇 |
地球物理 | 436篇 |
地质学 | 748篇 |
海洋学 | 214篇 |
天文学 | 121篇 |
综合类 | 169篇 |
自然地理 | 163篇 |
出版年
2024年 | 7篇 |
2023年 | 29篇 |
2022年 | 62篇 |
2021年 | 70篇 |
2020年 | 55篇 |
2019年 | 66篇 |
2018年 | 63篇 |
2017年 | 64篇 |
2016年 | 79篇 |
2015年 | 71篇 |
2014年 | 64篇 |
2013年 | 82篇 |
2012年 | 84篇 |
2011年 | 94篇 |
2010年 | 87篇 |
2009年 | 83篇 |
2008年 | 83篇 |
2007年 | 111篇 |
2006年 | 85篇 |
2005年 | 51篇 |
2004年 | 47篇 |
2003年 | 63篇 |
2002年 | 45篇 |
2001年 | 46篇 |
2000年 | 74篇 |
1999年 | 99篇 |
1998年 | 93篇 |
1997年 | 74篇 |
1996年 | 78篇 |
1995年 | 60篇 |
1994年 | 52篇 |
1993年 | 53篇 |
1992年 | 30篇 |
1991年 | 28篇 |
1990年 | 26篇 |
1989年 | 20篇 |
1988年 | 31篇 |
1987年 | 11篇 |
1986年 | 13篇 |
1985年 | 10篇 |
1984年 | 12篇 |
1983年 | 11篇 |
1982年 | 8篇 |
1981年 | 5篇 |
1980年 | 7篇 |
1978年 | 3篇 |
1976年 | 3篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有2396条查询结果,搜索用时 0 毫秒
61.
利用FY-1C连续两年的遥感资料,以敦煌辐射校正场为分析区,系统分析了FY-1C可见光、近红外通道的衰减特征,开展了通道衰减订正试验。分析结果表明,FY-1C除可见光通道1衰减强烈外,其它各可见光、近红外通道衰减性能稳定。利用统计分析法,可以建立定标系数衰减订正量随时间的变化关系。订正后的定标系数与2000年辐射校正场外定标实验结果一致性很好。更新后的定标系数可以有效克服通道衰减带来的通道反射率测值误差,提高FY-1C可见光、近红外通道遥感资料定量应用的精度。 相似文献
62.
63.
Hairu Li Gang Liu Ju Gu Hong Chen Hongqiang Shi Mohamed A. M. Abd Elbasit Feinan Hu 《水文研究》2021,35(2):e14060
Aggregate disintegration is a critical process in soil splash erosion. However, the effect of soil organic carbon (SOC) and its fractions on soil aggregates disintegration is still not clear. In this study, five soils with similar clay contents and different contents of SOC have been used. The effects of slaking and mechanical striking on splash erosion were distinguished by using deionized water and 95% ethanol as raindrops. The simulated rainfall experiments were carried out in four heights (0.5, 1.0, 1.5 and 2.0 m). The result indicated that the soil aggregate stability increased with the increases of SOC and light fraction organic carbon (LFOC). The relative slaking and the mechanical striking index increased with the decreases of SOC and LFOC. The reduction of macroaggregates in eroded soil gradually decreased with the increase of SOC and LFOC, especially in alcohol test. The amount of macroaggregates (>0.25 mm) in deionized water tests were significantly less than that in alcohol tests under the same rainfall heights. The contribution of slaking to splash erosion increased with the decrease of heavy fractions organic carbon. The contribution of mechanical striking was dominant when the rainfall kinetic energy increased to a range of threshold between 9 J m−2 mm−1 and 12 m−2 mm−1. This study could provide the scientific basis for deeply understanding the mechanism of soil aggregates disintegration and splash erosion. 相似文献
64.
GPS Solutions - Recently, 3D building models have become an important aid to many positioning methods such as LiDAR and GPS positioning. Creating an accurate 3D building model requires accurate 2D... 相似文献
65.
66.
Olivier Moine Pierre Antoine Sylvie Coutard Gilles Guérin Christine Hatté Clément Paris Ségolène Saulnier-Copard 《第四纪科学杂志》2021,36(8):1322-1340
The Amiens-Renancourt 1 site recently yielded one of the most important Upper Palaeolithic human occupations of northern France by the number of flint artefacts and especially by the presence of Venus figurines. All the material comes from a single archaeological layer located in a tundra gley bracketed by loess units. A multi-proxy study combining a detailed stratigraphy, luminescence and radiocarbon datings and high-resolution (5 cm per sample) grain size and molluscan analyses was therefore carried out to reconstruct and date the associated environmental changes and to determine the exact context of the human occupation. The chronological frame thus established supports the correlations of the archaeology-bearing tundra gley and of an underlying arctic brown soil with Greenland interstadials GI-4 and GI-3. Composition changes in the molluscan population enabled the identification of transitional and optimum phases and sub-phases within these two pedogenetic horizons. A conceptual correlation model linking molluscan phases with millennial-scale variations of Greenland ice-core and Sieben Hengste speleothem climate records is proposed. The Human occupation appears contemporaneous to the end of the stadial–interstadial transition of GI-3. Synchronous in Amiens-Renancourt 1 and Nussloch, subsequent micro-gleys may also result from a regional/global forcing. Such a level of detail is unprecedented in a loess sequence. 相似文献
67.
68.
69.
为改善风云三号 (FY-3) 微波成像仪10.6 GHz通道空间分辨率,提出利用超分辨率图像重建算法进行图像重建。分析并指出FY-3微波成像仪10.6 GHz通道具有过采样特征,具备重建得到高于瞬时视场图像的潜力;基于超分辨率图像重建理论,根据FY-3气象卫星轨道、姿态,微波成像仪性能参数以及工作模式等物理约束,建立微波成像仪的超分辨率成像模型,并推导计算出超分辨率成像模型参数;采用POCS算法重建得到10.6 GHz通道的超分辨率图像,采用目视比较分析、图像统计分析对重建图像进行质量评价:重建图像像元平均梯度提高26.5%,功率谱分量和提高5.7%,重建图像具有更高的空间分辨率;台风亮温分析应用显示了从重建图像可发现更微小的景物细节目标。采用超分辨率图像重建算法对FY-3微波成像仪10.6 GHz通道进行重建处理,结果有效且正确,可为数据用户提供更多可用的遥感数据,对微波遥感数据应用具有提升作用。 相似文献
70.
In organic-rich gas shales, clay minerals and organic matter (OM) have significant influences on the origin, preservation, and production of shale gas. Because of the substantial role of nanoscale pores in the generation, storage, and seepage of shale gas, we examined the effects of clay minerals and OM on nanoscale pore distribution characteristics in Lower Paleozoic shale gas reservoirs. Using the Niutitang and Longmaxi shales as examples, we determined the effects of clay minerals and OM on pores through sedimentation experiments. Field emission–scanning electron microscopy combined with low-pressure N2 adsorption of the samples before and after sedimentation showed significant differences in pore location and pore size distribution between the Niutitang and Longmaxi shales. Nanoscale pores mostly existed in OM in the Longmaxi shale and in clay minerals or OM–clay composites in the Niutitang shale. The distribution differences were attributed largely to variability in thermal evolution and tectonic development and might account for the difference in gas-bearing capacity between the Niutitang and Longmaxi reservoirs. In the nanoscale range, mesopores accounted for 61–76% of total nanoscale pore volume. Considerably developed nanoscale pores in OM were distributed in a broad size range in the Longmaxi shale, which led to good pore connectivity and gas production. Numerous narrow pores (i.e., pores?<?20 nm) in OM–clay composites were found in the Niutitang shale, and might account for this shale’s poor pore connectivity and low gas production efficiency. Enhancing the connectivity of the mesopores (especially pores?<?20 nm and those developed in OM–clay composites) might be the key to improving development of the Niutitang shale. The findings provide new insight into the formation and evolutionary mechanism of nanoscale pores developed in OM and clay minerals. 相似文献