全文获取类型
收费全文 | 5216篇 |
免费 | 961篇 |
国内免费 | 1554篇 |
专业分类
测绘学 | 580篇 |
大气科学 | 1001篇 |
地球物理 | 1429篇 |
地质学 | 2593篇 |
海洋学 | 684篇 |
天文学 | 104篇 |
综合类 | 371篇 |
自然地理 | 969篇 |
出版年
2024年 | 37篇 |
2023年 | 111篇 |
2022年 | 234篇 |
2021年 | 239篇 |
2020年 | 288篇 |
2019年 | 289篇 |
2018年 | 231篇 |
2017年 | 277篇 |
2016年 | 254篇 |
2015年 | 311篇 |
2014年 | 341篇 |
2013年 | 320篇 |
2012年 | 368篇 |
2011年 | 387篇 |
2010年 | 295篇 |
2009年 | 360篇 |
2008年 | 313篇 |
2007年 | 372篇 |
2006年 | 363篇 |
2005年 | 316篇 |
2004年 | 282篇 |
2003年 | 236篇 |
2002年 | 205篇 |
2001年 | 161篇 |
2000年 | 167篇 |
1999年 | 128篇 |
1998年 | 142篇 |
1997年 | 119篇 |
1996年 | 101篇 |
1995年 | 82篇 |
1994年 | 90篇 |
1993年 | 84篇 |
1992年 | 55篇 |
1991年 | 46篇 |
1990年 | 25篇 |
1989年 | 34篇 |
1988年 | 20篇 |
1987年 | 17篇 |
1986年 | 7篇 |
1985年 | 6篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 1篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 3篇 |
1954年 | 1篇 |
排序方式: 共有7731条查询结果,搜索用时 62 毫秒
881.
Ji-Hoon Kim Jeongho Lee Tae-Jin Cheong Rak-Hyeon Kim Dong-Chan Koh Jong-Sik Ryu Ho-Wan Chang 《Journal of Hydrology》2005,300(1-4):188-198
The purpose of this study is to apply time series analysis to investigate whether the groundwater quality in the coastal area is affected by the tide. Continuous and regular in situ monitoring data of electrical conductivity (EC) and groundwater level, and tidal level data measured by the National Oceanographic Research Institute were used for the time series analysis. Through the time series analysis, it is known that EC and groundwater level conspicuously fluctuate with two periodicities (15.4 and 0.52-day), which is very similar to those of the tide. Also the behaviors of their fluctuations vary in accordance with the tidal period. These indicate that the groundwater quality has been mainly controlled by the tidal level, and the strength of tidal effect on the groundwater quality is different according to the tidal period. 相似文献
882.
The seasonal and interannual variations of Beijing urban heat island (UHI) are investigated in this paper using the temperature data from 1960 to 2000 at 20 meteorological stations in the Beijing region, and then the relationship between the intensity and spatial scale of UHI and Beijing urbanization indices is analyzed and discussed. Main conclusions are the followings. First, Beijing UHI shows obvious seasonal variations, and it is strongest in winter, next in spring and autumn, and least in summer. The seasonal variation of the UHI mainly occurs in the urban area. The UHI intensity at the center of Beijing is more than 0.8℃ in winter, and only 0.5℃ in summer. Second, the intensity of Beijing HUI exhibits a clear interannual warming trend with its mean growth rate (MGR) being 0.3088℃/10 a. The MGR of HUI is largest in winter, next in spring and autumn, and least in summer, and the urban temperature increase makes a major contribution to the growth of HUI intensity. Third, since the Reform and Opening, the urbanization indices have grown several ten times or even one hundred times, the intensity of HUI has increased dramatically, and its spatial scale also expanded distinctively along with the expansion of urban architectural complexes. Fourth, the interannual variation of urbanization indices is very similar with that of HUI intensity, and their linear correlation coefficients are significant at a more than 0.001 confidence level. 相似文献
883.
A new efficient method is developed for the analysis of pile-group effects on the seismic stiffness and strength design of buildings with pile foundations. An efficient continuum model consisting of a dynamic Winkler-type soil element and a pile is used to express the dynamic behavior of the structure-pile-soil system with only a small numerical error. The pile-group effect is taken into account through the influence coefficients among piles which are defined for interstory drifts and pile-head bending moments. It is shown that, while the pile-group effect reduces the interstory drift of buildings in general, it may increase the bending moment of piles at the head. This means that the treatment without the pile-group effect results in the conservative design for super-structures and requires a revised member design for piles. 相似文献
884.
人才聚集效应是人才聚集现象从量变到质变的过程,是在一定的时间和空间范围内,在和谐环境下,相关人才按照一定的相互联系相对集中在一起产生超过各自独立作用的效用。在汶川8.0级地震和青海玉树7.1级地震的抗震救灾过程中,人才聚集效应发挥了不可磨灭的作用,无数的生命被及时挽救,巨大的灾情得到有效的缓解。综合物理空间和虚拟空间两个角度,从人才规模、人才配置和激励因素等方面,就我国抗震救灾中人才聚集效应的发挥进行了研究,为人才聚集效应理论提供借鉴。 相似文献
885.
ZHAO Wenzhi WANG Zhaoyun HE Haiqing ZHANG Mingjie WANG Hongjun WANG Yunpeng & QIN Yong . Research Institute of Petroleum Exploration & Development PetroChina Beijing China . PetroChina Exploration & Production Beijing China . Department of Geology Lanzhou University Lanzhou China . Guangzhou Geochemical Institute Chinese Academy of Sciences Guangzhou China . China University of Mining Technology Xuzhou China 《中国科学D辑(英文版)》2005,48(4):441-453
It has been proven in exploration practice that thecarbonates in China not only can generate hydrocar-bons, but also form commercial reservoirs. The car-bonates are different from clastic rocks in view of theirdeposition environment as well as their sedimentaryand diagenetic processes. Therefore, the evaluationcriteria and hydrocarbon generation mechanism forcarbonates can not be the same as that for clasticrocks, and it is important to establish a special hydro-carbon generation mechanism and… 相似文献
886.
887.
INTRODUCTIONBased onthe results gathered after manyyears of seismic groundwater observation,itisfoundthatthe water level in deep wells responds to the earth’s tide and atmospheric pressure and changesaccordingly,not onlyin amplitude ,but also in the phase lag by different degrees .Some phase lagslast onlyfor several minutes ,while some last aslong as more than one hour (Zhang Zhaodong,1988 ;Wang Chengmin,1990) .The result of this theoretical research shows that the phase lag response to… 相似文献
888.
Distribution and fractionation mechanism of stable carbon isotope of coalbed methane 总被引:6,自引:0,他引:6
The stable carbon isotope values of coalbed methane range widely, and also are gener- ally lighter than that of gases in normal coal-formed gas fields with similar coal rank. There exists strong carbon isotope fractionation in coalbed methane and it makes the carbon isotope value lighter. The correlation between the carbon isotope value and Ro in coalbed methane is less obvious. The coaly source rock maturity cannot be judged by coalbed methane carbon isotope value. The carbon isotopes of coalbed methane become lighter in much different degree due to the hydrodynamics. The stronger the hydrodynamics is, the lighter the CBM carbon isotopic value becomes. Many previous investigations indicated that the desorption-diffusion effects make the carbon isotope value of coalbed methane lighter. However, the explanation has encountered many problems. The authors of this arti- cle suggest that the flowing groundwater dissolution to free methane in coal seams and the free methane exchange with absorbed one is the carbon isotope fractionation mechanism in coalbed methane. The flowing groundwater in coal can easily take more 13CH4 away from free gas and com- paratively leave more 12CH4. This will make 12CH4 density in free gas comparatively higher than that in absorbed gas. The remaining 12CH4 in free gas then exchanges with the adsorbed methane in coal matrix. Some absorbed 13CH4 can be replaced and become free gas. Some free 12CH4 can be ab- sorbed again into coal matrix and become absorbed gas. Part of the newly replaced 13CH4 in free gas will also be taken away by water, leaving preferentially more 12CH4. The remaining 12CH4 in free gas will exchange again with adsorbed methane in the coal matrix. These processes occur all the time. Through accumulative effect, the 12CH4 will be greatly concentrated in coal. Thus, the stable carbon isotope of coalbed methane becomes dramatically lighter. Through simulation experiment on wa- ter-dissolved methane, it had been proved that the flowing water could fractionate the carbon isotope of methane, and easily take heavy carbon isotope away through dissolution. 相似文献
889.
890.
逆断层地震近场地震动影响场和地表形变模拟 总被引:4,自引:0,他引:4
本文设计了一个MW7.0级地震的简单的逆断层有限移动源破裂模型,计算了断层周围64个观测点的加速度、速度和位移时程及峰值,简单讨论了近场地震动峰值、断层附近地表永久位移(或地表形变)的分布特点,并讨论了永久位移和地面运动速度大脉冲的关系。重点研究了断层附近三分量的永久位移(或地表形变)大小、方向和地震动作用特点。 相似文献