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61.
为了明确天津市软土地基对地铁车站的结构地震反应的影响规律,以天津市地铁3号线的昆明路站为工程背景,采用数值模拟分析的方法,研究了该地铁站的地震反应。通过建立二维平面有限元模型,分析了结构抗震薄弱环节及结构抗震性能的影响因素。研究结果表明:天津宁河波作用下结构中柱内力响应明显大于其他构件,且柱底连接处内力幅值最大,为结构抗震薄弱环节;周围土层的弹性模量及上覆土层厚度对结构抗震性能的影响更明显,而结构自身的等效弹性模量对结构抗震性能影响不明显。研究成果丰富了软土地区地铁车站抗震设计理论,对地铁车站的优化设计具有重要意义。 相似文献
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大型地下洞室不同开挖效应的动态仿真分析 总被引:3,自引:0,他引:3
针对云南锡业集团公司个旧锡矿地下采场洞室的开挖技术条件,采用非线性三维有限元法,对其动态开挖过程进行了仿真模拟分析,并优化选择了地下采场洞室的开挖顺序.结果表明,不同的开挖顺序,对围岩的稳定性具有显著的影响. 相似文献
64.
Integrated method of RS and GPR for monitoring the changes in the soil moisture and groundwater environment due to underground coal mining 总被引:3,自引:0,他引:3
Zhengfu Bian Shaogang Lei Hilary I. Inyang Luqun Chang Richen Zhang Chengjun Zhou Xiao He 《Environmental Geology》2009,57(1):131-142
Mining affects the environment in different ways depending on the physical context in which the mining occurs. In mining areas
with an arid environment, mining affects plants’ growth by changing the amount of available water. This paper discusses the
effects of mining on two important determinants of plant growth—soil moisture and groundwater table (GWT)—which were investigated
using an integrated approach involving a field sampling investigation with remote sensing (RS) and ground-penetrating radar
(GPR). To calculate and map the distribution of soil moisture for a target area, we initially analyzed four models for regression
analysis between soil moisture and apparent thermal inertia and finally selected a linear model for modeling the soil moisture
at a depth 10 cm; the relative error of the modeled soil moisture was about 6.3% and correlation coefficient 0.7794. A comparison
of mined and unmined areas based on the results of limited field sampling tests or RS monitoring of Landsat 5-thermatic mapping
(TM) data indicated that soil moisture did not undergo remarkable changes following mining. This result indicates that mining
does not have an effect on soil moisture in the Shendong coal mining area. The coverage of vegetation in 2005 was compared
with that in 1995 by means of the normalized difference vegetation index (NDVI) deduced from TM data, and the results showed
that the coverage of vegetation in Shendong coal mining area has improved greatly since 1995 because of policy input RMB¥0.4
per ton coal production by Shendong Coal Mining Company. The factor most affected by coal mining was GWT, which dropped from
a depth of 35.41 m before mining to a depth of 43.38 m after mining at the Bulianta Coal Mine based on water well measurements.
Ground-penetrating radar at frequencies of 25 and 50 MHz revealed that the deepest GWT was at about 43.4 m. There was a weak
water linkage between the unsaturated zone and groundwater, and the decline of water table primarily resulted from the well
pumping for mining safety rather than the movement of cracking strata. This result is in agreement with the measurements of
the water wells. The roots of nine typical plants in the study area were investigated. Populus was found to have the deepest
root system with a depth of about 26 m. Based on an assessment of plant growth demands and the effect of mining on environmental
factors, we concluded that mining will have less of an effect on plant growth at those sites where the primary GWT depth before
mining was deep enough to be unavailable to plants. If the primary GWT was available for plant growth before mining, especially
to those plants with deeper roots, mining will have a significant effect on the growth of plants and the mechanism of this
effect will include the loss of water to roots and damage to the root system. 相似文献
65.
本文概述了探测地下管线的基本方法、地下管线探测仪的选择及地球物理探测方法的选择,介绍了在非开挖工地调查探测地下管线的步骤和方法。 相似文献
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Liu Yi nan Sun Fengxia Cui Yueju Pan Xiaodong Ma Mingzhi Zhang Xin Du Jianguo 《地球科学进展》2017,32(8):810-817
The hydrochemical types and origins of underground water in Songyuan and vicinity, Liaoning Province were discussed based on the hydrochemical composition, δD and δ18O. The water samples from eight wells were collected 4 times during 2014 to 2015. The main ion concentrations of water were analyzed with an Ion Chromatography. Isotopic compositions of hydrogen and oxygen were analyzed with the Liquid Water Isotope Analyzer. The mineralization (TDS) of the water ranged from 125.4 mg/L to 19 350.9 mg/L. Values of δD and δ18O ranged from -71.7‰ to -98.1‰ and from -9.0‰ to -12.5‰, respectively. The isotopic data indicated that the water originated from meteorological precipitation. The chemical compositions of Taolaizhao phreatic water were influenced by the human activity while the other water samples collected from artesian well were less affected by the human activity. Water in Changling, Dongdashi, Taohaotai, Qianan and Ningjiang were characterized by HCO3-Na with low TDS values. Such chemical types of water with fluctuations of Na+, SO 4 2 - and δ18O drift were resulted from dissolving silicate minerals and adding surfactant during oil exploitation. Fresh water in Fuyu well was Cl-Na type, which was influenced by acid injection during oil exploitation. Water in Qianguo well was characterized by Cl-Na type with TDS up to 19 350.9 mg/L, the obvious fluctuations of hydrogen and oxygen isotopes and increasing ion concentrations in the Qianguo well may be caused by the earthquakes that occurred in the sampling duration. The results will provide the background of hydrochemistry, and will be of benefit to monitoring earthquake and certificating seismic-chemical anomalies in the future. 相似文献
69.
落马洞暗河发育特征及其洪涝成因分析 总被引:1,自引:1,他引:0
根据区域岩溶发育史分析认为,湖北宣恩县落马洞暗河的形成总体上可分为两个阶段:第一阶段发生在白垩纪末至晚第三纪。在该阶段中,降水主要通过发育于卧西坪岩溶坡立谷地两侧的小型洼地、落水洞汇入地下管道,往卧西坪谷地排泄,在卧西坪一带形成一小型岩溶湖泊的同时,还在谷地西侧形成了下黑槽、铜锣坪、扁洞三个近东西向地下暗河系统。第二个阶段发生在晚第三纪至今。在这一期间,随着区域构造运动的振荡性抬升,岩溶侵蚀基准面不断下降,在谷地内形成了上、下黑槽、铜锣坪落水洞与卧西坪消水洞等垂向岩溶管道,贯通早期形成的东西向管道并袭夺卧西坪和铜锣坪一带的地表岩溶湖水,使得原分散的岩溶水系统通过南北向的主管道集中排泄,形成了多进口的树枝状复杂管道暗河系统。卧西坪岩溶坡立谷内常年遭受洪涝的原因主要是由于落马洞地下暗河形成年代较晚,管道规模较小,且洞内坍塌淤积严重,排水能力小。在此基础上,提出了加强流域水土流失管理、疏通河道和新建排水隧洞等治理措施与防治对策。 相似文献
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