全文获取类型
收费全文 | 12934篇 |
免费 | 2746篇 |
国内免费 | 4229篇 |
专业分类
测绘学 | 1760篇 |
大气科学 | 2273篇 |
地球物理 | 2916篇 |
地质学 | 7374篇 |
海洋学 | 2094篇 |
天文学 | 315篇 |
综合类 | 1323篇 |
自然地理 | 1854篇 |
出版年
2024年 | 91篇 |
2023年 | 269篇 |
2022年 | 768篇 |
2021年 | 920篇 |
2020年 | 694篇 |
2019年 | 917篇 |
2018年 | 869篇 |
2017年 | 872篇 |
2016年 | 868篇 |
2015年 | 818篇 |
2014年 | 986篇 |
2013年 | 1033篇 |
2012年 | 1037篇 |
2011年 | 1060篇 |
2010年 | 1054篇 |
2009年 | 917篇 |
2008年 | 890篇 |
2007年 | 773篇 |
2006年 | 704篇 |
2005年 | 577篇 |
2004年 | 466篇 |
2003年 | 390篇 |
2002年 | 358篇 |
2001年 | 331篇 |
2000年 | 278篇 |
1999年 | 315篇 |
1998年 | 236篇 |
1997年 | 233篇 |
1996年 | 171篇 |
1995年 | 174篇 |
1994年 | 166篇 |
1993年 | 145篇 |
1992年 | 125篇 |
1991年 | 73篇 |
1990年 | 65篇 |
1989年 | 55篇 |
1988年 | 54篇 |
1987年 | 31篇 |
1986年 | 21篇 |
1985年 | 12篇 |
1984年 | 11篇 |
1983年 | 10篇 |
1982年 | 13篇 |
1981年 | 11篇 |
1980年 | 17篇 |
1979年 | 11篇 |
1976年 | 2篇 |
1958年 | 7篇 |
1957年 | 1篇 |
1954年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
941.
942.
943.
Summary Annual and seasonal changes of the urban heat island magnitude in Washington, D.C. and a close-in suburb were analyzed for the period of 1945 through 1979. Monthly and annual mean temperature data, corrected for elevation, from three stations (National Airport, D.C.—downtown, Silver Spring, MD—suburban, and Beltsville, MD—rural) were evaluated by testing the statistical significance of temperature differences between the different data sets.The analysis indicated that the absolute heat island magnitudes have increased at the rate of 0.020 and 0.019 C/yr at Washington National Airport and Silver Spring, respectively during the study period. The differences between these two rates were not statistically significant at the 0.95 confidence level. However, the increase of the heat island magnitude from 1945 to 1979 at the suburban station was 20% greater than that at the downtown station. Those results indicate that as urbanization progresses, the suburban site, Silver Spring, has become incorporated into the Washington, D.C. urban heat island. The data also indicate that the magnitude of the heat island near the city center has continued to increase despite a significant population decrease since 1950.With 5 Figures 相似文献
944.
This article, on the basis of the expert’s analyses and theories of the forecast of heavy-rain, summarizes a variety of the current instruments and methods of forecast and, according to the train of thought of the high-rank forecasters, distills their experiences in forecasting heavy-rain into an inference-tree of 106 junctures from which 101 rule-bases are derived. The logical calculation is automatically carried out with our introduced and developed PROLOG, one of the intelligent languagas by means of micro-computer. This process adopts the uncertain inferential method based on the theory of fuzzy sets, breaks through the limits of two-value logic and is characteristic of the thinking of human brain. 相似文献
945.
本文利用北京气象中心的业务预报模式(B模式),采用全风速调整方案,进行了绕流、爬坡等各种数值试验,研究青藏高原和落基山对气旋的动力影响。结果表明,气流绕青藏高原而行,产生的散度场与东亚的气旋生成区和路径匹配;在青藏高原主体下游,高层辐合,抑制了我国大陆东部的气旋发展。在北美,落基山对大气的动力影响以爬坡为主,由于气流在迎风坡上升,空气绝热冷却,在背风面大规模下沉增温,对流层低层形成暖脊,这对背风锋生和背风气旋的发生发展有着直接的影响;另外爬坡作用也是美国中西部干线形成的主要原因。 相似文献
946.
947.
The properties of rock resitivity were studied under pressure, particularly with “stress reversal”, a procedure in which the
pressure applied was increased and decreased.
It was observed that, 1) With pressure increasing, the main feature of resistivity change was increase-steady-decrease for
high-saturation rock samples (saturation 70–100%). But the main feature for low-saturation samples was different. 2) In 10
out of 11 cases of “stress reversal” for high-saturation samples the resistivity droped (about 2%). Such drop could explain
the anomalies in geoelectricity terms, which are commonly observed before earthquakes in China. 3) It was also observed shortly
before rock failure that, a) the resistivity drops more dramatically (about 20%) during “stress reversal” period, which is
much more than ordinary drops. b) these drops occurred not only during stress decrease but also during stress increase. c)
Resistivity exhibits anisotropy: the resistivity along different directions may differ by 10%. These three features may indicate
that the rock is nearing failure, while ordinary resistivity drops are only connected with “stress reversal” and may not mean
the imminence of rock failure. 4) Resistivity increase was observed during the “stress reversal” period for low-saturation
rock samples.
The results mentioned above were explained with the effect of water flowing in and out of the cracks of rock. The temporary
factors which yield a reduction of the maximum main stress, may enhence the possibility of earthquake occurrence. 相似文献
948.
China's Loess Plateau was formed under special conditions. The tectonic movement, topographical characteristics, and monsoon patterns combined to create a favourable environment for the accumulation of thick loessic deposits. The Loess Plateau itself is part of the ‘Monsoon Triangle’ of China, a region very susceptible to climatic changes. Throughout the Upper Pleistocene the palaeoenvironment on the Loess Plateau alternated from steppe, to deciduous forest and coniferous forest, in response to shifts in the atmospheric circulation. Three monsoon patterns appear to be indicated: (1) a full glacial monsoon pattern (18000–15000 yr BP) which induced a cold and dry climate favouring loess accumulation in steppe conditions; (2) an interglacial monsoon pattern (last interglacial and Holocene) in which a warm humid climate prevailed with deciduous forests, leaving palaeosols interbedded within the loess sequence; and (3) a transitional or interstadial monsoon pattern (50 000–23 000 yr BP) in which the climate was cold and humid in the Loess Plateau, encouraging the development of coniferous forest. 相似文献
949.
Rui Feng Jun Wang Shuzhen Zheng Guifang Huang Huifen Yan Hainan Zhou Ruoshui Zhang 《地震学报(英文版)》1988,1(4):73-84
Following Airy and Pratt principles, five kinds of local-compensation models are analysed and a rapid 3-D gravity formula
is utilized to calculate isostatic anomalies for 66 models with different parameters. It is noted that isostatic gravity maps
appear nearly identical in their main patterns and features. The optimum compensation model in North China is one of modified
Airy models in which the different density distribution in the surface, upper crust and lower crust is taken into account
and the standard crustal thickness is about 50km. The position of the complete compensation interface is located in the upper
mantle. The North China platform as a whole is under sub-isostatic equilibrium status with an isostatic anomaly of about 18·10−5 m/s2 on an average. The distribution of isostatic gravity anomaly shows an obvious blockwise pattern. Most positive anomaly areas
occur over the eastern part, the Jiao-Liao Block, Mt. Yan block and northern margin of the Hebei-Shandong block, whereas a
negative area occurs in the Shanxi graben. The comparison of models indicates that the Moho discontinuity is not suitable
to be taken as a compensation interface, and the compensation effects in Airy model are better than that in Pratt model, which
is consistent with the feature of dominant layered structure and less lateral inhomogeneity in crust. Some results about composite
compensation, the basic characteristics of isostatic anomaly and deep stucture will be published later in the second part
of this paper.
Wang Bowen took part in some work in this paper. 相似文献
950.