全文获取类型
收费全文 | 3132篇 |
免费 | 595篇 |
国内免费 | 688篇 |
专业分类
测绘学 | 72篇 |
大气科学 | 25篇 |
地球物理 | 295篇 |
地质学 | 3060篇 |
海洋学 | 682篇 |
天文学 | 1篇 |
综合类 | 164篇 |
自然地理 | 116篇 |
出版年
2024年 | 21篇 |
2023年 | 81篇 |
2022年 | 121篇 |
2021年 | 134篇 |
2020年 | 111篇 |
2019年 | 145篇 |
2018年 | 118篇 |
2017年 | 147篇 |
2016年 | 176篇 |
2015年 | 144篇 |
2014年 | 182篇 |
2013年 | 156篇 |
2012年 | 211篇 |
2011年 | 190篇 |
2010年 | 178篇 |
2009年 | 226篇 |
2008年 | 196篇 |
2007年 | 204篇 |
2006年 | 230篇 |
2005年 | 162篇 |
2004年 | 148篇 |
2003年 | 138篇 |
2002年 | 166篇 |
2001年 | 116篇 |
2000年 | 139篇 |
1999年 | 94篇 |
1998年 | 99篇 |
1997年 | 80篇 |
1996年 | 58篇 |
1995年 | 50篇 |
1994年 | 38篇 |
1993年 | 32篇 |
1992年 | 27篇 |
1991年 | 15篇 |
1990年 | 19篇 |
1989年 | 6篇 |
1988年 | 17篇 |
1987年 | 5篇 |
1986年 | 11篇 |
1985年 | 5篇 |
1984年 | 8篇 |
1983年 | 1篇 |
1982年 | 6篇 |
1981年 | 3篇 |
1977年 | 1篇 |
排序方式: 共有4415条查询结果,搜索用时 15 毫秒
941.
942.
LI Yaohu WANG Yang SHI Yu YANG Leilei CUI Qiliang BI Caiqin XU Yinbo WANG Qianyou SHAN Yansheng LIU Weibin MIAO Miao WANG Ting 《《地质学报》英文版》2023,97(3):873-888
Because it is necessary to focus on differences in regional oil reservoirs and determine the priority of the CCUSEOR(Carbon capture, utilization, and storage-enhanced oil recovery) deployment under China’s net-zero CO2 emission target, systematic and regional evaluations of CO2 sequestration capacity in major oil basins are needed considering the geofluid properties―carbon sequestration capacity in place(CSCIP)―where the ’in place’ indicates actual geological formation cond... 相似文献
943.
在我国油气资源对外依存度不断攀升,能源安全形势日益严峻的背景下,油气调查评价和勘探开发仍是能源工作的重中之重.近年来,公益性油气调查工作聚焦自身优势,积极服务于国家能源安全,支撑油气资源管理与矿权体制改革成效显著,在油气勘探的新区、新层、新类型方面不断取得突破性成果.公益性油气调查在新疆塔里木盆地西北部温宿凸起新近系、沙井子构造带志留系,准噶尔盆地南缘的二叠系和三叠系均获得了工业油(气)流;在南方鄂西宜昌、黔北武陵山等复杂构造区的页岩气、松辽盆地的页岩油、四川盆地南部煤层气等资源的勘探均取得了重大突破,这些成果有力带动了能源企业的积极投入与勘探,有效彰显了公益性油气地质调查的引领和示范作用.深层油气资源的安全勘探、油气矿权空白区的基础地质调查及非常规油气的调查与勘探将是我国未来油气勘探重要的接替领域.公益性油气调查将以油气基础地质问题为抓手,积极探索油气勘探接替领域,为油气资源规划和管理做好支撑,力争为国家能源安全保障与重大发展战略做出更大的贡献. 相似文献
944.
《Marine Policy》2015
The international compensation regime for tanker oil pollution has been successful in providing adequate and prompt compensation to pollution victims in its member states. Nevertheless, the attitudes of different countries toward acceptance of this regime have varied considerably. This paper aims to explain three main factors in the acceptance of the regime, including: (1) The level of economic development; (2) the risk of exposure to tanker oil spills; and (3) the financial burden associated with adherence to the International Oil Pollution Compensation Fund (IOPC). Using both fuzzy-set Qualitative Comparative Analysis and an Ordered Probit model, this study found two patterns causing upper-middle and high income countries to have a high acceptance level: (a) Those facing a medium risk of oil spills and having a low financial burden; and (b) those facing a high risk of oil spills. The study reveals that, for a country with a high risk of exposure to tanker oil spills, such as China, with its improvement in economic status it is far better for it to join the IOPC Fund, so as to provide better protection both for potential pollution victims and for the marine environment. The results of this study can also be applied to other countries that are considering whether or not to accept the international compensation regime for tanker oil pollution. 相似文献
945.
946.
947.
Peter Suedfeld 《Planetary and Space Science》2010,58(4):639-645
The simulation and analogue environments used by psychologists to circumvent the difficulties of conducting research in space lack many of the unique characteristics of future explorations, especially the mission to Mars. This paper suggests that appropriate additional analogues would be the multi-year maritime and terrestrial explorations that mapped the surface of the Earth in previous centuries. These, like Mars, often involved a hazardous trek through unknown territory, flanked by extended, dangerous voyages to and from the exploration sites. Characteristic issues included interpersonal relationships under prolonged stress, stretches of boredom interspersed with intense work demands, the impossibility of rescue, resupply, or other help from home, chronic danger, physical discomfort and lack of privacy, and the crucial role of the leader. Illustrative examples of one important factor, leadership style, are discussed. The examination of such expeditions can help to identify the psychological stressors that are likely to be experienced by Mars explorers, and can also indicate countermeasures to reduce the damaging impact of those stressors. 相似文献
948.
芳香族分子示踪在海洋油气勘探中的开发和应用 总被引:5,自引:0,他引:5
苯 (benzene)、甲苯 (toluene)、乙苯 (ethylbenzene)和二甲苯 (xylene) (缩写为BTEX)等单环芳烃化合物是原油的主要成分。地层水中苯的痕量分布作为油气藏分子示踪的研究 ,得到国外石油地球化学家们的广泛重视。Burtell等人利用测试海洋石油钻井附近地层水中苯系化合物的含量确定新井位 ,在海洋油气资源勘探方面获得了巨大成功。文中主要介绍了国内在海洋石油勘探的随钻检测和面积化探中应用该类指标的效果和相关方法。通过渤中凹陷试验区取得的地球化学成果 ,验证并揭示了芳香族化合物中分子量级的BTEX指标与油气藏的关系。BTEX指标异常与油气藏直接相关 ,与烷烃类指标相比具有高分辨、高精度特点 ,是有价值的海洋油气地球化学勘探指标。BETX指标应用的关键是高精度测试出样品中芳香族化合物的分子级含量 ,激光单原子高技术为该技术的应用提供了技术保证。在油气资源勘探中 ,利用此指标 ,结合测井、地震等地球物理方法综合分析研究可以减小多解性 ,获得较好的预测效果。 相似文献
949.
Most practical reservoir simulation studies are performed using the so-called black oil model, in which the phase behavior
is represented using solubilities and formation volume factors. We extend the multiscale finite-volume (MSFV) method to deal
with nonlinear immiscible three-phase compressible flow in the presence of gravity and capillary forces (i.e., black oil model).
Consistent with the MSFV framework, flow and transport are treated separately and differently using a sequential implicit
algorithm. A multiscale operator splitting strategy is used to solve the overall mass balance (i.e., the pressure equation).
The black-oil pressure equation, which is nonlinear and parabolic, is decomposed into three parts. The first is a homo geneous
elliptic equation, for which the original MSFV method is used to compute the dual basis functions and the coarse-scale transmissibilities.
The second equation accounts for gravity and capillary effects; the third equation accounts for mass accumulation and sources/
sinks (wells). With the basis functions of the elliptic part, the coarse-scale operator can be assembled. The gravity/capillary
pressure part is made up of an elliptic part and a correction term, which is computed using solutions of gravity-driven local
problems. A particular solution represents accumulation and wells. The reconstructed fine-scale pressure is used to compute
the fine-scale phase fluxes, which are then used to solve the nonlinear saturation equations. For this purpose, a Schwarz
iterative scheme is used on the primal coarse grid. The framework is demonstrated using challenging black-oil examples of
nonlinear compressible multiphase flow in strongly heterogeneous formations. 相似文献
950.