首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   38834篇
  免费   252篇
  国内免费   183篇
测绘学   752篇
大气科学   1875篇
地球物理   7413篇
地质学   15118篇
海洋学   3671篇
天文学   9096篇
综合类   110篇
自然地理   1234篇
  2022年   497篇
  2021年   745篇
  2020年   805篇
  2019年   883篇
  2018年   1741篇
  2017年   1579篇
  2016年   1689篇
  2015年   647篇
  2014年   1467篇
  2013年   2105篇
  2012年   1660篇
  2011年   1976篇
  2010年   1852篇
  2009年   2076篇
  2008年   1837篇
  2007年   2046篇
  2006年   1801篇
  2005年   957篇
  2004年   858篇
  2003年   874篇
  2002年   771篇
  2001年   794篇
  2000年   664篇
  1999年   441篇
  1998年   455篇
  1997年   493篇
  1996年   355篇
  1995年   375篇
  1994年   353篇
  1993年   300篇
  1992年   301篇
  1991年   305篇
  1990年   348篇
  1989年   280篇
  1988年   269篇
  1987年   273篇
  1986年   205篇
  1985年   324篇
  1984年   328篇
  1983年   320篇
  1982年   302篇
  1981年   260篇
  1980年   289篇
  1979年   218篇
  1978年   254篇
  1977年   210篇
  1976年   178篇
  1975年   188篇
  1974年   177篇
  1973年   210篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
Churkin  K. O.  Nefedyev  Yu. A.  Andreev  A. O.  Demina  N. Yu.  Kronrod  E. V. 《Astronomy Reports》2021,65(7):580-587
Astronomy Reports - One of the priority tasks of modern astronomy is the observation and study of transient celestial processes, which also concerns photoelectric observations of lunar occultations...  相似文献   
82.
The results of the electromagnetic studies, obtained on the North Pole drifting stations, are reviewed. These results are still of current interest. The aspects of similar future works are discussed.  相似文献   
83.
Peculiarities of the dynamics and the structure formation in the estuary run-off lenses have been analysed based on field data obtained at the Guinean coast (the central eastern Atlantic Ocean). Attention was paid to the processes of restratification, internal mixing, and exchange in the areas of the frontal zone of the run-off lens and the tidal frontal zone. The stabilization of the front of the estuary run-off lens by means of the periodic washing out of its forepart by tidal upwelling is described. The mechanisms of the energy transformation in the leading part of the lens have been revealed. Effects of run-off and loczalization of transformed waters in the small-scale frontal zones are found. The energy estimations represented will be useful in considering analogous phenomena in other coastal regions.Translated by Mikhail M. Trufanov.  相似文献   
84.
Results of the studies of the ionospheric D region during spring periods of 2004 and 2005 using partial reflections and radiowave scattering by artificial periodical irregularities are presented. It has been found that the vertical profile of the electron density during this period has a local minimum at a height of ~75 km, which is absent in summer. The causes of the minimum appearance are discussed.  相似文献   
85.
A method has been proposed for detecting hidden periodicities in nonstationary finite time series with strong noise. The successive application of the spectral singular expansion and wavelet transform makes it possible to calculate the energy of short signals with an arbitrary form against a suppressing noise back-ground, the amplitude of which is several times as large as that of a useful signal. This method has been used to identify variations in the galactic cosmic ray (GCR) flux related to IMF disturbances due to the earthward propagation of solar magnetic clouds in the heliosphere.  相似文献   
86.
Onboard the International Space Station (ISS), two instruments are observing the solar spectral irradiance (SSI) at wavelengths from 16 to 2900 nm. Although the ISS platform orientation generally precludes pointing at the Sun more than 10?–?14 days per month, in November/December 2012 a continuous period of measurements was obtained by implementing an ISS ‘bridging’ maneuver. This enabled observations to be made of the solar spectral irradiance (SSI) during a complete solar rotation. We present these measurements, which quantify the impact of active regions on SSI, and compare them with data simultaneously gathered from other platforms, and with models of spectral irradiance variability. Our analysis demonstrates that the instruments onboard the ISS have the capability to measure SSI variations consistent with other instruments in space. A comparison among all available SSI measurements during November–December 2012 in absolute units with reconstructions using solar proxies and observed solar activity features is presented and discussed in terms of accuracy.  相似文献   
87.
The transient response of a conductive shell-shell model in the one-loop version was obtained analytically. The results indicate that four zones, namely early, late early, intermediate, and late zone can be identified in the total transient characteristic of the model. In case the measurements are carried out in the late early zone, a conductive target appears as a resistive one. It is suggested that the optimum time of measurement should be so selected as to fall in the intermediate zone.  相似文献   
88.
The impact of diffuse pollution, agricultural land use and climate change on the long-term response of subsurface–surface water quality is not well understood, but is a prerequisite for evaluation of water management options. The goal of this study is to model geochemical evolution of water chemistry from the infiltration through soil into the unsaturated zone, transport through bedrocks and granular aquifers to a river in order to identify zones of steep concentration gradients and high dynamics under transient flow conditions. A numerical model was constructed comprising a 2-D 1,500 m × 150 m vertical cross-section of typical sedimentary rock formations, a glacio-fluvial quaternary gravel aquifer in the valley and soil layers. The model coupled saturated/un-saturated flow and reactive transport under steady state and transient conditions. Geochemical interactions, include intra-aqueous kinetic reactions of oxygen with dissolved organic matter, as well as kinetics of carbonate dissolution/precipitation. This model section was chosen to provide insight in to the principal processes and time scales affecting water chemistry along different flow paths. The numerical simulator MIN3P was used, a finite volume program for variably saturated subsurface flow and multi-component reactive transport. The results show that subsurface water residence times range from approximately 2 to 2,000 years. Different zones are to be expected with respect to the development of mineral equilibria; namely, purely atmospherically influenced, as well as open and closed system carbonate dissolution. Short-term responses to daily averaged changes in precipitation, however, are only visible to some extent in the shallower and near-river parts of flow system and solute loads. This can most likely be explained by directional changes in flow paths, indicating that equilibrium geochemical condition predominate at the hillslope scale, i.e. water quality depends on transport pathways rather than on kinetic effects. The extent of reducing conditions is controlled by the presence of organic-rich layers (i.e. peat deposits), the dissolution kinetics of aquifer organic matter and the subsequent mixing with oxygenated water by hydrodynamic dispersion.  相似文献   
89.
Moroz  Yu. F.  Loginov  V. A. 《Doklady Earth Sciences》2018,482(2):1370-1374

The methods and results of magnetotelluric sounding in the range of 0.0001–1000 s and more with the use small portable magnetotelluric stations are considered. Data on the distribution of electrical conductivity at depths beneath the Avacha–Koryak zone of contemporary volcanism are obtained. The obtained data are interpreted using the modern techniques and methods.

  相似文献   
90.
Zakonnov  V. V.  Poddubnyi  S. A. 《Water Resources》2002,29(2):181-190
Long-standing variations in the structure of bottom sediments within typical habitats of the aquatic life are characterized using the Volzhskii Pool of the Rybinsk Reservoir as an example. The role of hydrodynamic processes of the littoral zone in the formation of the ground complex of shallow water areas of the pool is discussed. The trends in variation in the quality of bottom substrate in fish habitats are analyzed. The peculiarities of long-standing variations in the distribution of types of bottom sediments in the entire reservoir are shown.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号