全文获取类型
收费全文 | 14924篇 |
免费 | 2129篇 |
国内免费 | 2679篇 |
专业分类
测绘学 | 3316篇 |
大气科学 | 2200篇 |
地球物理 | 2215篇 |
地质学 | 6238篇 |
海洋学 | 1711篇 |
天文学 | 411篇 |
综合类 | 1315篇 |
自然地理 | 2326篇 |
出版年
2024年 | 35篇 |
2023年 | 121篇 |
2022年 | 342篇 |
2021年 | 454篇 |
2020年 | 473篇 |
2019年 | 582篇 |
2018年 | 405篇 |
2017年 | 555篇 |
2016年 | 522篇 |
2015年 | 633篇 |
2014年 | 780篇 |
2013年 | 789篇 |
2012年 | 900篇 |
2011年 | 1014篇 |
2010年 | 809篇 |
2009年 | 854篇 |
2008年 | 891篇 |
2007年 | 1075篇 |
2006年 | 1014篇 |
2005年 | 979篇 |
2004年 | 905篇 |
2003年 | 767篇 |
2002年 | 768篇 |
2001年 | 589篇 |
2000年 | 568篇 |
1999年 | 462篇 |
1998年 | 451篇 |
1997年 | 382篇 |
1996年 | 330篇 |
1995年 | 288篇 |
1994年 | 269篇 |
1993年 | 190篇 |
1992年 | 142篇 |
1991年 | 106篇 |
1990年 | 81篇 |
1989年 | 80篇 |
1988年 | 45篇 |
1987年 | 38篇 |
1986年 | 19篇 |
1985年 | 10篇 |
1984年 | 5篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1954年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
992.
993.
Vulnerability of groundwater in Quaternary aquifers to organic contaminants: a case study in Wuhan City,China 总被引:5,自引:0,他引:5
Yanxin Wang Broder J. Merkel Yilian Li Hui Ye Surong Fu Dana Ihm 《Environmental Geology》2007,53(3):479-484
More than 30 organic contaminants were detected in shallow groundwaters at Wuhan, the largest city in central China. Seriously
contaminated groundwaters were from densely populated, industrial and commercial areas. Abnormal concentrations were found
in groundwater from Hankou, downtown Wuhan: trimethylbenzene up to 29 μg/L, tetramethylbenzene up to 866 μg/L, and trichloroethene
up to 9.5 μg/L. Benzene, Toluene, Ethylene and Xylene (BTEX) contamination of groundwater is serious and widespread at Wuhan,
ranging between 0.14 and 25.0 μg/L. Considering the hydrogeological conditions of most Chinese cities, DRAMIC, a modified
version of the widely used DRASTIC model, was proposed by the authors for assessing vulnerability of groundwater to contamination.
The factors D, R, A and I in DRAMIC model are the same as in DRASTIC. The factor topography is ignored. The factor soil media is substituted by a new factor aquifer thickness (M) and the factor hydraulic conductivity of the aquifer by a new factor impact of contaminant (C). The equation for determining the DRAMIC Index is: DRAMIC = 5D
R + 3R
R + 4A
R + 2M
R + 5I
R + 1C
R. The calculated DRAMIC Index can be used to identify areas that are more likely to be susceptible to groundwater contamination
relative to each other. The higher the DRAMIC Index is, the greater the groundwater pollution potential. Applying DRAMIC,
a GIS-based vulnerability map for Wuhan city was prepared. Interestingly, places such as downtown Hankou, where enhanced concentrations
of BTEX have been detected, correspond quite well with those with higher DRAMIC ratings. 相似文献
994.
野外露头沉积学描述计算机辅助系统的任务是要帮助地质工作者实现野外露头沉积学描述信息的数字化处理,即利用计算机实现方便的数据录入、存储、管理、输出、辅助分析等。从地质模型分析入手,给出了系统的功能模型、模块划分和数据库模型。本系统的特点是实现了有关地质信息标准化采集、管理和处理分析,可为盆地分析、成岩成矿分析和区域地质调查工作提供技术支持。 相似文献
995.
天然气藏勘探的成功或失利,取决于气藏圈闭的封堵系统和散失系统。介绍了四川盆地气藏圈闭封堵系统和散失系统的类型、分布范围和对气藏圈闭的保存和破坏作用。气藏圈闭封堵系统的优劣取决于圈闭的有效封堵面与区域盖层的有效整体封闭条件和区域水动力停滞带环境条件,封堵系统良好的圈闭,勘探成功率高。气藏圈闭散失系统由缺乏区域盖层有效整体封闭条件的剥蚀区、区域水动力自由交替带环境、通天断层或潜伏通天断层组成。散失系统导致圈闭失效,从而造成勘探失利。通过对四川盆地天然气藏的破坏与保存条件的多个实例剖析,提出在四川盆地及我国南方海相天然气勘探中应当重视对天然气藏破坏与保存条件的研究,以利于天然气藏勘探区块、目标的选择和勘探效率的提高。 相似文献
996.
裂陷盆地中的构造变换带及其石油地质意义 总被引:16,自引:0,他引:16
构造变换带是裂陷盆地中的重要构造变形。讨论了构造变换带的含义、类型及对油气聚集的意义。裂陷盆地主干正断层之间的几何关系可以分为同向倾斜、背向倾斜和相向倾斜共3种组合方式;正断层之间的构造变换方式可以分为缓冲式、接力式、消长式、传递式和消减式等5种形式,构成15种类型的构造变换带。不同方式的断裂组合所形成的不同构造变换带类型会随着主干正断层位移的渐进增大发生相应的转变。构造变换带是有利的油气聚集区带:(1)它常常是主边界断裂带上地形高差变化较小的部位,是主要碎屑物源注入裂陷盆地的入口处,有利于发育储集层;(2)长期处于盆地内部相对高的构造部位,而且近邻生油凹陷,是油气运移指向区带;(3)它是裂陷盆地构造变形相对复杂的区带,有利于发育多种样式的油气圈闭。 相似文献
997.
Wang Yong Hou Zengqian Mo Xuanxue Dong Fangliu Bi Xianmei Zeng Pusheng 《Frontiers of Earth Science》2007,1(3):322-332
More than 140 middle-small sized deposits or minerals are present in the Weishan-Yongping ore concentration area which is
located in the southern part of a typical Lanping strike-slip and pull-apart basin. It has plenty of mineral resources derived
from the collision between the Indian and Asian plates. The ore-forming fluid system in the Weishan-Yongping ore concentration
area can be divided into two subsystems, namely, the Zijinshan subsystem and Gonglang arc subsystem. The ore-forming fluids
of Cu, Co deposits in the Gonglang arc fluid subsystem have δD values between −83.8‰ and −69‰, δ18O values between 4.17‰ and 10.45‰, and δ13C values between −13.6‰ and 3.7‰, suggesting that the ore-forming fluids of Cu, Co deposits were derived mainly from magmatic
water and partly from formation water. The ore-forming fluids of Au, Pb, Zn, Fe deposits in the Zijinshan subsystem have δD
values between −117.4‰ and −76‰, δ18O values between 5.32‰ and 9.56‰, and Δ13C values between −10.07‰ and −1.5‰. The ore-forming fluids of Sb deposits have δD values between −95‰ and −78‰, δ18O values between 4.5‰ and 32.3‰, and Δ13C values between −26.4‰ and −1.9‰. Hence, the ore-forming fluids of the Zijinshan subsystem must have been derived mainly
from formation water and partly from magmatic water. Affected by the collision between the Indian and Asian plates, ore-forming
fluids in Weishan-Yongping basin migrated considerably from southwest to northeast. At first, the Gonglang arc subsystem with
high temperature and high salinity was formed. With the development of the ore-forming fluids, the Zijinshan subsystem with
lower temperature and lower salinity was subsequently formed.
Translated from Mineral Deposits, 2006, 25(1): 60–70 [译自: 矿床地质] 相似文献
998.
When galvanic interactions between pyrite and chalcopyrite occur in solution, pyrite, with the higher rest potential, acts
as a cathode and is protected whereas chalcopyrite, with the lower rest potential, acts as an anode and its oxidation is increased.
In this work a three-electrode system was used to investigate the corrosion current density and mixed potential of a galvanic
cell comprising a pyrite cathode and a chalcopyrite anode in a flowing system. The results showed that with increasing concentration
of ferric ion in the solution, with increasing acidity, and with increasing flow rate of the solution, the corrosion current
density increased and the mixed potential of the galvanic cell became more positive. These experimental results are of direct
significance to the control of environmental pollution in mining activity. By using the galvanic model, mixed potential theory,
and the Butler–Volmer equation, the experimental results were explained theoretically. 相似文献
999.
Simulation-optimization approach to assess groundwater availability in Refugio County, TX 总被引:10,自引:0,他引:10
Sustainable management of groundwater resources is critical for viable development of semi-arid regions. Refugio County, TX,
is predominantly a rural community that is in close proximity to two large urban areas of Corpus Christi and San Antonio.
Large-scale water supply projects are being planned to export surplus water available in Refugio County to nearby growing
cities. Being a coastal county with several sensitive bays and estuaries, these projects have caused concerns with regard
to decreases in freshwater inflows to coastal bodies and raised the possibility of saltwater intrusion. A simulation model
characterizing groundwater flow in the shallower unconfined and the deeper semi-confined formations of the Gulf coast aquifer
was calibrated and evaluated. The model results were used in conjunction with a mathematical programming scheme to estimate
maximum available groundwater in the county. Stakeholder concerns were incorporated as constraints, which included prevention
of saltwater intrusion in the aquifer, limiting the amount of allowable drawdown in shallow aquifers, as well as maintaining
current flow gradients especially near baseflow-dependent streams and rivers. For the conditions assumed in this study, the
model results indicate that roughly 4.93 × 107 m3 of water can be extracted in a typical year. The management model was noted to be very sensitive to the imposed saltwater
intrusion constraint. 相似文献
1000.
在总结大量实际工作的基础上,就区域生态环境遥感监测的指标与分类系统问题进行了探讨,提出了尽可能与现有的土地利用分类衔接,又较容易进行遥感判读和分类的土地利用分类系统;根据目前国内遥感数据获取和使用情况提出了遥感影像选择、处理以及合成的最佳方案,推荐了通过目视判读和自动分类获得土地利用状况的方法等,以期生态环境遥感监测能真正纳入环保部门常规的监测工作中. 相似文献