全文获取类型
收费全文 | 22967篇 |
免费 | 191篇 |
国内免费 | 130篇 |
专业分类
测绘学 | 354篇 |
大气科学 | 1203篇 |
地球物理 | 4354篇 |
地质学 | 9011篇 |
海洋学 | 2230篇 |
天文学 | 5266篇 |
综合类 | 42篇 |
自然地理 | 828篇 |
出版年
2022年 | 263篇 |
2021年 | 431篇 |
2020年 | 396篇 |
2019年 | 464篇 |
2018年 | 940篇 |
2017年 | 864篇 |
2016年 | 880篇 |
2015年 | 366篇 |
2014年 | 766篇 |
2013年 | 1288篇 |
2012年 | 897篇 |
2011年 | 1092篇 |
2010年 | 1054篇 |
2009年 | 1212篇 |
2008年 | 1038篇 |
2007年 | 1218篇 |
2006年 | 1062篇 |
2005年 | 565篇 |
2004年 | 533篇 |
2003年 | 540篇 |
2002年 | 560篇 |
2001年 | 508篇 |
2000年 | 409篇 |
1999年 | 334篇 |
1998年 | 322篇 |
1997年 | 328篇 |
1996年 | 254篇 |
1995年 | 263篇 |
1994年 | 236篇 |
1993年 | 182篇 |
1992年 | 208篇 |
1991年 | 181篇 |
1990年 | 195篇 |
1989年 | 188篇 |
1988年 | 156篇 |
1987年 | 183篇 |
1986年 | 170篇 |
1985年 | 205篇 |
1984年 | 198篇 |
1983年 | 197篇 |
1982年 | 189篇 |
1981年 | 172篇 |
1980年 | 162篇 |
1979年 | 182篇 |
1978年 | 159篇 |
1977年 | 142篇 |
1976年 | 133篇 |
1975年 | 136篇 |
1974年 | 125篇 |
1973年 | 165篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
Chung-Lin SHIE Long S. CHIU Robert ADLER Eric NELKIN I-I LIN Pingping XIE Feng-Chin WANG R. CHOKNGAMWONG William OLSON D. Allen CHU 《大气科学进展》2009,26(6):1071-1080
Accurate sea surface flux measurements are crucial for
understanding the global water and energy cycles. The oceanic
evaporation, which is a major component of the global oceanic fresh
water flux, is useful for predicting oceanic circulation and
transport. The global Goddard Satellite-based Surface Turbulent
Fluxes Version-2 (GSSTF2; July 1987--December 2000) dateset that was
officially released in 2001 has been widely used by scientific
community for global energy and water cycle research, and regional
and short period data analyses. We have recently been funded by NASA
to resume processing the GSSTF dataset with an objective of
continually producing a uniform dataset of sea surface turbulent
fluxes, derived from remote sensing data. The dataset is to be
reprocessed and brought up-to-date (GSSTF2b) using improved input
datasets such as a recently upgraded NCEP/DOE sea surface
temperature reanalysis, and an upgraded surface wind and microwave
brightness temperature V6 dataset (Version 6) from the Special
Sensor Microwave Imager (SSM/I) produced by Remote Sensing Systems
(RSS). A second new product (GSSTF3) is further proposed with a
finer temporal (12-h) and spatial (0.25ox0.25o)
resolution. GSSTF2b (July 1987--December 2008) and GSSTF3 (July
1999--December 2009) will be released for the research community to
use by late 2009 and early 2011, respectively. 相似文献
82.
T. Ibungochouba Singh I. Ablu Meitei K. Yugindro Singh 《Astrophysics and Space Science》2013,345(1):177-181
Hawking radiation of Kerr-de Sitter black hole is investigated using Hamilton-Jacobi method. When the well-behaved Painleve coordinate system and Eddington coordinate are used, we get the correct result of Bekenstein-Hawking entropy before and after radiation but a direct computation will lead to a wrong result via Hamilton-Jacobi method. Our results show that the tunneling probability is related to the change of Bekenstein-Hawking entropy and the derived emission spectrum deviates from the pure thermal but it is consistent with underlying unitary theory. 相似文献
83.
Tropospheric lapse rate and its relation to surface temperature from reanalysis data 总被引:2,自引:0,他引:2
Estimates of the tropospheric lapse rate γ and analysis of its relation to the surface temperature T s in the annual cycle and interannual variability have been made using the global monthly mean data of the NCEP/NCAR reanalysis (1948–2001). The tropospheric lapse rate γ is about 6.1 K/km in the Northern Hemisphere (NH) as a whole and over the ocean and about 6.2 K/km over the continents. The value of γ decreases from 6.5 K/km at low latitudes to 4.5 K/km at polar latitudes. The values of dγ/dT s, the parameter of sensitivity of γ to the variation of T s for the NH in the interannual variability, are found to be about 0.04 km?1 (0.041 km?1 for the NH as a whole, 0.042 km?1 over the ocean, and 0.038 km?1 over the continents). This corresponds to an increase in γ of approximately 0.7% when the surface temperature of the NH is increased by 1 K. Estimates of dγ/dT s vary from about 0.05 km?1 in the subtropics to 0.10 km?1 at polar latitudes. When dγ/dT s is positive, the surface and tropospheric warming means a temperature decrease above a certain critical level H cr. The height of the level H cr with constant temperature, which is defined by the inverse value (dγ/dT s)?1, is about 25 km for the NH as a whole, i.e., above the tropopause. In the subtropics, H cr is about 20 km. At polar latitudes, H cr decreases to about 10 km. Positive values of dγ/dT s characterize a positive climatic feedback through the lapse rate and indicate a general decrease in the static stability of the troposphere during global warming. Along with a general tendency of γ to increase with rising T s, there are regional regimes with the opposite tendency, mainly over the ocean. The negative correlation of γ with T s is found over the oceanic tropics and midlatitudes, in particular, over the oceanic belt around Antarctica. 相似文献
84.
I. Xanthakis I. Liritzis B. Petropoulos C. Banos E. Sarris 《Earth, Moon, and Planets》1994,66(2):189-212
The atmospheric activity of Jupiter exhibits quasi-periodic character attributed to the stochastic nature of the involved mechanisms. Periodicities between 4–33 years are obtained employing four spectrum analysis methods, (power spectrum employing the Blackman-Tukey window, maximum entropy, Fourier, autocorrelation), whilst, their significance and their stationarity has been established with the application of general statistical tests (Kolmogorov-Smirnov, one sample and two sample test, randomness test, chi-square, various orders of autoregressive process, analysis of truncated records).Deceased. 相似文献
85.
86.
M. deCastro M. Gómez-Gesteira I. Alvarez J.L.G. Gesteira 《Continental Shelf Research》2009,29(8):1053-1059
The warming trend observed during the last decades in the Bay of Biscay is put within the context of sea surface temperature (SST) changes observed in the area since 1854. Macroscopically, two consecutive warming–cooling cycles were detected during this period of time: cooling from 1867 to 1910; warming from 1910 to 1945; cooling from 1945 to 1974; and warming from 1974 to nowadays. Warming rates of 0.17 and 0.22 °C per decade were measured during the warming sub-periods and cooling rates of ?0.14 and ?0.10 °C per decade were measured during the cooling sub-periods. The present warming period is on the same order of magnitude although slightly more intense than the one observed from 1910 to 1945, which is consistent with previous analysis carried for the North Atlantic. Finally, the thermal amplitude defined as the difference between the maximum and minimum annual values has increased since 1974 at a rate of 0.06 °C per decade due to the different increasing rates of the maximum (0.26 °C per decade) and minimum (0.20 °C per decade) SSTs. 相似文献
87.
I. M. Chertok 《Astronomy Reports》2006,50(1):68-78
Data obtained with the EIT UV telescope and LASCO coronagraph of the SOHO satellite are used to analyze large-scale solar disturbances associated with a series of major flares and coronal mass ejections that occurred in the late decline phase of cycle 23, on November 3–10, 2004, and gave rise to strong geomagnetic storms. Derotated fixed-base difference heliograms taken in the 195 Å coronal channel at 12-min intervals and in the various-temperature 171, 195, 284, and 304 Å channels at 6-h intervals indicate that these disturbances were global and homologous; i.e., they had similar characteristics and affected the same structures. Almost all of the nine events of this series included two recurrent systems of large-scale dimmings (regions of reduced intensity with lifetimes of 10–15 h): (a) transequatorial dimmings connecting a northern near-equatorial eruption center with a southern active region and (b) northern dimmings covering a large sector between two coronal holes. In this northern sector, coronal waves (brightenings propagated from the eruption center at speeds of several hundred km/s) were observed ahead of the expanding dimmings. The brightest, central part of the halo-type coronal mass ejection in each event corresponded to the northern dimming system. The properties of the dimmings and coronal waves and the relationship between them are discussed on the basis of the results obtained. We find that the eruption of large coronal mass ejections involves structures of the global solar magnetosphere with spatial scales far exceeding the sizes of active regions and normal activity complexes. 相似文献
88.
A problem of estimation of shock wave attenuation in an obstacle under an explosion of a high-energy material (explosive) charge on its surface is considered. An algorithm for its solution is proposed using the analytical and semiempirical dependences generally recognized in explosion physics. 相似文献
89.
I. A. Klimishin 《Astrophysics and Space Science》1973,22(1):3-12
The regularities of strong thermal waves moving in non-uniform media are considered in some detail. The application of thermal wave theory to Nova outburst interpretation is discussed. 相似文献
90.
The investigation of the bottom of Lake Baikal carried out during the 2008 summer season by means of Mir manned deep-submergence
vehicles resulted in the recovery of a series of sediments, ferruginous crusts, and peculiar mineralized tubes several centimeters
high and up to 2–6 cm in diameter. According to the scanning electron investigation, these formations consist mainly of the
enclosing sediment particles and biogcnie silica cemented by iron and minor manganese hydroxides. The chemical composition
of the tubes is similar to both that of the enclosing sediments and slightly ferruginous crusts and nodules, but the tubes
and crusts are somewhat richer relative to the sediments in some microelements, namely, arsenic, cadmium, and uranium. In
general, the structure and composition of these tubes reminds one of the worm tubes common in the sediments of a number of
seas. The investigation of the rare earth elements in some samples or ferruginous formations and sediments revealed a positive
europium anomaly, which might be related to either the composition of the surrounding continental magmatic rocks or to the
influence of hypothetical hydrothermal solutions. 相似文献