全文获取类型
收费全文 | 1549篇 |
免费 | 266篇 |
国内免费 | 333篇 |
专业分类
测绘学 | 225篇 |
大气科学 | 311篇 |
地球物理 | 327篇 |
地质学 | 722篇 |
海洋学 | 172篇 |
天文学 | 62篇 |
综合类 | 151篇 |
自然地理 | 178篇 |
出版年
2024年 | 8篇 |
2023年 | 29篇 |
2022年 | 70篇 |
2021年 | 91篇 |
2020年 | 67篇 |
2019年 | 67篇 |
2018年 | 93篇 |
2017年 | 85篇 |
2016年 | 83篇 |
2015年 | 84篇 |
2014年 | 88篇 |
2013年 | 98篇 |
2012年 | 79篇 |
2011年 | 84篇 |
2010年 | 79篇 |
2009年 | 67篇 |
2008年 | 66篇 |
2007年 | 63篇 |
2006年 | 67篇 |
2005年 | 60篇 |
2004年 | 45篇 |
2003年 | 35篇 |
2002年 | 52篇 |
2001年 | 50篇 |
2000年 | 46篇 |
1999年 | 83篇 |
1998年 | 68篇 |
1997年 | 75篇 |
1996年 | 52篇 |
1995年 | 30篇 |
1994年 | 25篇 |
1993年 | 38篇 |
1992年 | 28篇 |
1991年 | 24篇 |
1990年 | 11篇 |
1989年 | 14篇 |
1988年 | 5篇 |
1987年 | 10篇 |
1986年 | 9篇 |
1985年 | 2篇 |
1984年 | 5篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 5篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1958年 | 2篇 |
排序方式: 共有2148条查询结果,搜索用时 797 毫秒
161.
锚索的预应力损失在工程建设中不可忽视,工程的场地环境条件成为影响锚索预应力损失的主因。饱和粉细砂层较其他地质条件更为复杂敏感,更易引起锚索预应力值的损失。通过对廊坊市某深基坑工程锚索预应力值的实时监测,结合工程环境,分析饱和粉细砂层中造成锚索预应力值变化的原因。结果表明,施工过程、张拉过程以及环境因素都影响锚索预应力的变化,其中开挖过程的影响最明显,预应力值的变化率最大值达79.1%;瞬时卸载造成预应力值22.8%59.2%的损失。对饱和粉细砂层中锚索预应力变化规律的研究分析结论可为类似地质环境的工程建设提供经验。 相似文献
162.
Mobilization and redistribution of elements in soils developed from extreme weathering basalt on Hainan Island 总被引:1,自引:0,他引:1
Major, trace and organic elements of a South China were reported to investigate elements laterite profile developed on Neogene basalt on Hainan Island, mobilization and redistribution in tropical regions. The results indicate that strong acid environment and organic matter (OM) can remarkably improve the transfer of insoluble elements. Among all the elements, Th is the least mobile. As for the general conservative elements during incipient chemical weathering, such as Ti, Zr, Hf and Nb, the removals are up to 30%-40% in the upper profile. And for Fe, A1, Cu and Ni, that tend to be combined with secondary minerals and to be retained in temperate zone, they are re- moved from the upper profile, transferred downwards, and then precipitated in the lower profile. In addition, atmos- pheric inputs, including sea salt aerosols and dust, have a profound effect on the budgets of elements that are susceptible to leaching losses (e.g. K, Na and Sr). Excluding the possibilities of groundwater and erosion, the remarkable increase of K, Na and Sr concentrations in the upper profile, together with dramatically upward increasing trends of the percentage changes of Sr/Th, K/Th and Na/Th ratios, show that atmospheric inputs, especially sea salt aerosols, contribute much extraneous seawater derived elements, such as K, Na and Sr to the soils. The overall elemental be- haviors in this profile suggest that organic matter and atmospheric inputs play a very important role in the mobiliza- tion and redistribution of elements during extreme weathering in tropical regions. 相似文献
163.
164.
The research area is located in the western part of Sichuan basin as a Yangtze ecotope of Cathaysian Tethyan area. It is dominated by benthic fauna, including brachiopods, Fusulinids, corals, bivalves, foraminifers, ammonites, bryozoans,Crinoids and pleopods which are less common with traces of trilobites, stromatoporas, nautilus and sporopollens seen in one or two areas,which are obviously controlled by sedimentary environments and in accordance with sedimentary facies.Through the analysis of fossils and research on burial characteristics from middle Permian middleTriassic, based on the combination of the feature of fossils in time and space, seventeen communities are recognized, the coposition, construction and palaeoenvironment of each community are expounded. Study shows that different ecological type biocoenose are distributed in different locations, which are mainly represented by sessile benthic community in the main research area, composed of Mianzhu, Mianyang, Deyang and Santai and nektonic community in marginal areas in the research area subdivided into two parts: Areas around Guangyuan-Nanjiang-Tongjiang, located at the margins in the northeast of the research area, and areas around Wenchuan-Maoxian-Dayidafeishui situated at the western borders of the research area. According to the combination of communities with sedimentary characteristics,six kinds of biofacies have been recognized and described in the study area and biofacies pattern are established. Category,ecotype, typical community and sedimentary facies of each biofacies are elucidated in this paper. The subdivision and analysis of community are meaningful for the studies of paleoenvironment ,paleogeography and their evolutions,The research of biaofacies is important for the recovery of paleobiogeography and paleoplate tectonic characteristics. 相似文献
165.
166.
根据宜昌站、汉口站和大通站的径流量数据,运用M-K检验和小波分析等方法,对1900年以来长江流域径流量的趋势和周期变化进行分析,探究径流量变化对厄尔尼诺?南方涛动(ENSO)和太平洋年代际振荡(PDO)的响应。结果表明:1900 年以来长江流域径流量呈显著的减少趋势,并具有2~8 a的年际周期变化和14~17 a的年代际周期变化。流域径流量与ENSO具有相同的2~8 a周期变化,在El Ni?o发生期,径流量较低,在La Ni?a发生期,径流量较高。14~17 a的周期变化与PDO相关,在暖位相期径流量偏少,在冷位相期径流量偏多。PDO影响着ENSO和径流量之间的相关性,在暖位相期,El Ni?o对径流量的影响增强,在冷位相期,La Ni?a对径流量的影响增强。因此,在分析和预测流域径流量长时间尺度上的变化时要综合考虑ENSO和PDO的影响。 相似文献
167.
168.
GPS Solutions - Carrier phase ambiguity resolution over long baselines is challenging in BDS data processing. This is partially due to the variations of the hardware biases in BDS code signals and... 相似文献
169.
宫同伦 《地球科学与环境学报》1991,(1)
本文用动力成矿观点对小秦岭金矿田富矿体的形成提出了新的解释,对本区的动力成矿特点作了较详细的说明。文中联系到地壳演化的不同阶段对金矿的富化过程进行了较深入的讨论,并提出了新的成矿系列。笔者以基础地质、大地构造和同位素年龄资料为依据对小秦岭金矿田含金石英脉的成因提出了与前人不同的新观点,认为它是晋宁晚期岩浆期后热液矿床。 相似文献
170.