全文获取类型
收费全文 | 144篇 |
免费 | 17篇 |
国内免费 | 8篇 |
专业分类
测绘学 | 7篇 |
大气科学 | 15篇 |
地球物理 | 44篇 |
地质学 | 66篇 |
海洋学 | 7篇 |
天文学 | 19篇 |
综合类 | 6篇 |
自然地理 | 5篇 |
出版年
2022年 | 4篇 |
2021年 | 4篇 |
2020年 | 8篇 |
2019年 | 5篇 |
2018年 | 4篇 |
2017年 | 15篇 |
2016年 | 10篇 |
2015年 | 8篇 |
2014年 | 5篇 |
2013年 | 5篇 |
2012年 | 12篇 |
2011年 | 10篇 |
2010年 | 5篇 |
2009年 | 8篇 |
2008年 | 3篇 |
2007年 | 9篇 |
2006年 | 6篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 6篇 |
2002年 | 4篇 |
2001年 | 9篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1995年 | 2篇 |
1994年 | 5篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1990年 | 3篇 |
1988年 | 2篇 |
1976年 | 1篇 |
排序方式: 共有169条查询结果,搜索用时 31 毫秒
1.
为查明文昌B凹陷油气富集差异性的原因,基于断裂展布和形成期次、构造样式组合、构造演化和断层活动的差异等标志,建立了差异伸展- 走滑机制,识别出19洼为伸展- 强走滑、14洼为伸展- 中等走滑、30洼为伸展- 弱走滑。差异伸展- 走滑作用控制了优质烃源岩的展布和供烃方向,控制输导体系类型和运移动力,提供物源通道和改造储层,还控制了圈闭类型和力学性质。进一步深化了走滑增压理论,基于先存断裂形态、伸展应力场右旋演化和应变差异,建立了走滑增压圈闭识别方法,识别出S型增压、右行左阶增压、斜交型增压3种走滑增压构造。研究表明,文昌B凹陷的油气富集受伸展- 走滑构造背景、源- 运时空配置关系所控制,强—中等走滑变形、发育优质中深湖源岩的文昌19洼和14洼是油气富集区。该研究成果成功推动了文昌凹陷近期的多个勘探发现。 相似文献
2.
Wang Minfang Zhang Xubo Guo Xiaonan Pi Daohui Yang Meijun 《Mineralogy and Petrology》2018,112(1):85-103
Mineralogy and Petrology - Electron probe microanalysis (EPMA) results are reported for newly identified silver–bearing minerals from the Xinhua deposit, Yunkaidashan area, South China. The... 相似文献
3.
二十多年来,南海天然气水合物勘查评价均主要集中在南海北部大陆边缘陆坡深水区,且先后在珠江口盆地神狐、珠江口盆地东部海域调查区和琼东南盆地陵水-松南调查区取得了天然气水合物勘查试采的重大突破及进展,陆续发现了两个大规模的天然气水合物藏,初步评价预测南海天然气水合物资源规模达800亿吨油当量左右,取得了南海天然气水合物勘探的阶段性重大成果.然而,南海天然气水合物资源进一步深化和拓展勘探的有利领域在哪里?尤其是可持续滚动勘探的战略接替区及选区在何处?其与目前陆坡深水油气及水合物勘探紧密相邻的外陆坡-洋陆过渡带(OCT)乃至洋盆区是否具有天然气水合物形成的地质条件?根据海洋地质调查及初步的地质综合分析研究,认为外陆坡-洋陆过渡带乃至洋盆区具备天然气水合物成藏的基本地质条件,可作为南海未来天然气水合物勘查的战略接替区和可持续滚动勘探的战略选区及资源远景区.针对这些影响和决定将来天然气水合物勘探决策部署及走向等关键问题进行初步分析与探讨,抛砖引玉希望能够对未来南海天然气水合物资源勘查评价及战略接替区之选择有所裨益! 相似文献
4.
Low‐frequency passive integrated transponders (PIT tags), are commonly used for monitoring pebble mobility in gravel‐bed rivers. Although early studies reported high recovery rates for PIT tags used in small streams, recovery rates in larger systems remain low, substantially limiting the possibilities for their use in such rivers. These low recovery rates are potentially due to missed detections caused by tag signal collision, burial in the sediment layer deeper than the maximum detection range and insufficient (but still exhausting) field effort to cover the concerned areas. A potential solution for addressing these problems is to use active ultra‐high frequency (a‐UHF) transponders as these have a greater detection range and anti‐collision protocols. In order to assess the potential of such transponders for pebble tracking in rivers, we used 433.92 MHz COIN‐ID and COIN‐HC models (ELA Innovation Company, Montpellier, France). We completed several tests to (i) characterize transponder detection ranges in the water and in saturated sediment and (ii) develop field protocols for locating tags by combining global positioning systems (GPS) sites and transponder received signal strength indication (RSSI) levels. The results showed that (i) the maximum detection ranges are about 2.4 m in the water column and more than 2.6 m in a column of saturated gravelly‐sandy sediment, (ii) RSSI spatial interpolation can be used to determine transponder position with good accuracy (< 1 m), (iii) the desired minimal level of accuracy can be adjusted depending on in‐field effort and signal impulse interval, (iv) the RSSI maximal value observed cannot yet be used to determine transponder burial depth because of the multipath propagation of radio frequencies and the semi‐directional emission of the tag signal. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
5.
Multidimensional Toxicity of Rhamnolipid Extracts Obtained From Creosote‐Contaminated Soil 下载免费PDF全文
6.
7.
介绍了2013~2014中国大陆构造环境监测网络的基本情况及西部地区绝对重力观测的情况,并对观测结果进行分析。结果表明,成果稳定性良好,89.5%的成果观测精度优于±5.00μGal,能够满足"陆态网络"的技术要求。 相似文献
8.
9.
Performance of ENSEMBLES regional climate models over Central Europe using various metrics 总被引:1,自引:1,他引:0
Eva Holtanová Ji?í Mik?ovsky Jaroslava Kalvová Petr Pi?oft Martin Motl 《Theoretical and Applied Climatology》2012,108(3-4):463-470
We show the evaluation of ENSEMBLES regional climate models (RCMs) driven by reanalysis ERA40 over a region centered at the Czech Republic. Attention is paid especially to the model ALADIN-CLIMATE/CZ, being used as the basis of the new climate change scenarios simulation for the Czech Republic. The validation criteria used here are based on monthly or seasonal mean air temperature and precipitation. We concentrate not only on spatiotemporal mean values but also on temporal standard deviation, inter-annual variability, the mean annual cycle, and the skill of the models to represent the observed spatial patterns of these quantities. Model ALADIN-CLIMATE/CZ performs quite well in comparison to the other RCMs; we find its performance satisfactory for further use for impact studies. However, it is also shown that the results of evaluation of the RCMs’ skill in simulating observed climate strongly depend on the criteria incorporated for the evaluation. 相似文献
10.
Christopher Packham Keith L. Thompson Almudena Zurita Johan H. Knapen Ian Smail Robert Greimel Daniel F. M. Folha Chris Benn rew Humphrey Rene Rutten David Ciardi Matthieu Bec Richard Bingham Simon Craig Kevin Dee Derek Ives Paul Jolley Peter Moore Marti Pi i Puig Simon Rees Gordon Talbot Sue Worswick 《Monthly notices of the Royal Astronomical Society》2003,345(2):395-405