全文获取类型
收费全文 | 4888篇 |
免费 | 807篇 |
国内免费 | 1023篇 |
专业分类
测绘学 | 683篇 |
大气科学 | 705篇 |
地球物理 | 711篇 |
地质学 | 2698篇 |
海洋学 | 464篇 |
天文学 | 5篇 |
综合类 | 463篇 |
自然地理 | 989篇 |
出版年
2024年 | 30篇 |
2023年 | 74篇 |
2022年 | 206篇 |
2021年 | 264篇 |
2020年 | 232篇 |
2019年 | 233篇 |
2018年 | 184篇 |
2017年 | 247篇 |
2016年 | 257篇 |
2015年 | 279篇 |
2014年 | 351篇 |
2013年 | 318篇 |
2012年 | 365篇 |
2011年 | 396篇 |
2010年 | 307篇 |
2009年 | 329篇 |
2008年 | 349篇 |
2007年 | 361篇 |
2006年 | 293篇 |
2005年 | 245篇 |
2004年 | 204篇 |
2003年 | 172篇 |
2002年 | 156篇 |
2001年 | 157篇 |
2000年 | 119篇 |
1999年 | 109篇 |
1998年 | 103篇 |
1997年 | 95篇 |
1996年 | 65篇 |
1995年 | 55篇 |
1994年 | 42篇 |
1993年 | 35篇 |
1992年 | 34篇 |
1991年 | 9篇 |
1990年 | 9篇 |
1989年 | 7篇 |
1988年 | 6篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1977年 | 2篇 |
排序方式: 共有6718条查询结果,搜索用时 328 毫秒
11.
气相色谱法测定地下水中六六六结果的不确定度评定 总被引:7,自引:4,他引:3
依照《测量不确定度评定与表示》,对气相色谱法测定地下水中六六六(HCH)四种单体结果进行了不确定度评定。分析了测量过程中引入的不确定度来源,包括提取液体积的量取、样品提取溶液的定容体积、分析仪器的进样量、标准系列溶液的测量以及仪器重复测定等分量引入不确定度及其各参数的采集和计算方法,最后合成标准不确定度,通过乘以95%概率下的扩展因子2,获得测量结果的扩展不确定度。 相似文献
12.
13.
M. Draoui J. Vias B. Andreo K. Targuisti J. Stitou El Messari 《Environmental Geology》2008,54(3):455-463
This paper presents the results of a comparative study relating to the application of four vulnerability mapping methods,
GOD, AVI, DRASTIC and SINTACS, in a pilot detritic aquifer situated in NW Morocco, known as the Martil–Alila aquifer. The
principal objective of this work is to determine the most suitable such methods for this aquifer type within a Mediterranean
context, and to show the effect of the rainfall variations that are characteristic of the Mediterranean climate on the degree
of vulnerability. The methods applied distinguish five classes of vulnerability, these being irregularly divided up in space,
with the division varying according to the method in question. The vulnerability maps obtained by the different methods strongly
suggest that the eastern half of the aquifer is more vulnerable to contamination than the western half, for all hydrological
situations. The effect of climatic conditions on the degree of vulnerability is well represented by the DRASTIC, according
to which the aquifer is moderately to strongly vulnerable during humid hydrological years and weakly to moderately vulnerable
during dry ones. For the other methods, this climatic effect is limited to the area occupied by the two predominant classes
(“High” and “Low” for GOD and “High” and “Moderate” for SINTACS) while it is null for AVI. In conclusion, DRASTIC appears
the most suitable for mapping the vulnerability to contamination of Mediterranean coastal detritic aquifers such as the Martil–Alila
aquifer. 相似文献
14.
David King 《Natural Hazards》2008,47(3):497-508
The concept of a natural hazard is a human construct. It is the interaction with human communities and settlements that defines
a natural phenomenon as a natural hazard. Thus the end point of hazard mitigation and hazard vulnerability assessment must
involve an attempt to reduce, or mitigate, the impact of the natural hazard on human communities. The responsibility to mitigate
hazard impact falls primarily upon governments and closely connected non-government and private institutional agencies. In
particular, it is most often local government that takes the responsibility for safeguarding its own communities, infrastructure
and people. Hazard vulnerability of specific local communities is best assessed by the local government or council, which
then faces the responsibility to translate that assessment into community education and infrastructural safeguards for hazard
mitigation. This paper illustrates the process of local government engagement in hazard mitigation in Australia, through the
Natural Disaster Risk Management Studies, as a first step towards natural disaster reduction. 相似文献
15.
海底管道开沟机械的技术经济性能评定与选型 总被引:1,自引:0,他引:1
本文在对水下管道开沟机械的需求市场、实际应用和研制开发动向作深入调研的基础上,选择水下管道开沟机械特有的技术先进性、适用性、安全可靠性以及经济性评价指标,构造评价模型,对水下管道施工作业中广为应用的水力冲射开沟机械、海底管道犁、机械开沟机和土壤液化法埋管设备及其机型的技术经济性能作了较为详尽地分析对比及综合评价。在此基础上,笔者提出了水下管道开沟机械的一般选型原则和对我国海底管道开沟机械研究开发工 相似文献
16.
贡湖水质富营养化综合评价及初步预测 总被引:13,自引:0,他引:13
对1996年7月贡湖三次调查资料进行的水质和富营养化现状综合评价显示:贡湖水质以Ⅲ-Ⅳ类为主,局部已出发V类,凯氏氮,非离子氨和总磷为主要污染物;营养型以中营养和中富营养类型分布面积较广。 相似文献
17.
18.
19.
20.
A. Mascle R. Vially E. Deville B. Biju-Duval J.P. Roy 《Marine and Petroleum Geology》1996,13(8):941-961
The Southeast Basin of France is the thickest onshore French sedimentary basin which contains locally as much as 10 km of Mesozoic-Cenozoic sediment. Basin development occurred in several stages between late Carboniferous and late Cretaceous times. Partial tectonic inversion took place during two compressive events, the so-called ‘Pyrenean’ and ‘Alpine’ phases of late Cretaceous-early Tertiary and late Tertiary ages respectively. They are separated by an intervening stretching event of Oligocene age, which further south resulted in the opening of the western Mediterranean oceanic basin. As a result of this complex tectonic history, structural traps were difficult to image on the seismic data shot during the first phase of exploration prior to 1980. Oil and gas natural seeps, and shows in several wells, indicate that some petroleum systems are, or have been active, at least in some places.The present erosional western margin of the basin is more or less superimposed on the initial Triassic-Jurassic margin. Margin subsidence and Tertiary inversion are discussed using regional sections on which the polyphase history of the entire basin is well shown. These sections are located on three major segments where the Mesozoic margin is either partly preserved (Ardèche), or has been partly inverted in late Tertiary times (Vercors-Chartreuse), or has been completely inverted in early Tertiary times (Corbières-eastern Pyrenees). 1-D ‘Genex’ basin modelling on the Ardèche segment, and 2-D ‘Thrustpack’ structural-maturity modelling in the Vercors-Chartreuse segment are used to further assess the remaining petroleum plays. 相似文献