全文获取类型
收费全文 | 578篇 |
免费 | 24篇 |
国内免费 | 11篇 |
专业分类
测绘学 | 15篇 |
大气科学 | 90篇 |
地球物理 | 121篇 |
地质学 | 235篇 |
海洋学 | 51篇 |
天文学 | 69篇 |
自然地理 | 32篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 7篇 |
2021年 | 9篇 |
2020年 | 12篇 |
2019年 | 14篇 |
2018年 | 15篇 |
2017年 | 12篇 |
2016年 | 20篇 |
2015年 | 15篇 |
2014年 | 28篇 |
2013年 | 43篇 |
2012年 | 34篇 |
2011年 | 45篇 |
2010年 | 29篇 |
2009年 | 60篇 |
2008年 | 37篇 |
2007年 | 34篇 |
2006年 | 33篇 |
2005年 | 33篇 |
2004年 | 20篇 |
2003年 | 9篇 |
2002年 | 31篇 |
2001年 | 9篇 |
2000年 | 5篇 |
1999年 | 7篇 |
1998年 | 3篇 |
1997年 | 9篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 6篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有613条查询结果,搜索用时 0 毫秒
611.
Stephen Taylor Laurent Mavinga Moise Bashiga 《Singapore journal of tropical geography》2023,44(2):339-355
As international health organizations have increasingly acknowledged the global burden of psychological trauma, global health experts have sought to appraise and organize the treatment of trauma through objective, neutral forms of classification and calculation. Rather than see trauma as a singular thing whose biological, social and psychological formation is bracketed by expert perspectives, this paper focuses on how psychological trauma is enacted—that is, brought into being and sustained—in particular contexts and practices. If trauma can be made and unmade in practices, rather than assumed to be a stable thing, then these practices become a matter of concern rather than fact for geographers. We take as our empirical focus the province of North Kivu in the eastern Democratic Republic of Congo, where trauma has become a matter of growing local, national and international concern. Working with and beyond the conceptual work of Annemarie Mol, we demonstrate how different ‘versions’ of trauma uneasily co-exist in the region. Interrogating these versions, we explore the tensions that arise from attempting to explain and summate the incidence of trauma that is not singular or stable but is, instead, emergent and enacted in a variety of practices. 相似文献
612.
Steeve Gréaux Denis Andrault Laurent Gautron Nathalie Bolfan-Casanova Mohamed Mezouar 《Physics and Chemistry of Minerals》2014,41(6):419-429
Compressibility of perovskite-structured Ca3Al2Si3O12 grossular (GrPv) was investigated at high pressure and high temperature by means of angle-dispersive powder X-ray diffraction using a laser-heated diamond anvil cell. We observed the Pbnm orthorhombic distortion for the pure phase above 50 GPa, whereas below this pressure, Al-bearing CaSiO3 perovskite coexists with an excess of corundum. GrPv has a bulk modulus (K 0 = 229 ± 5 GPa; \(K_{0}^{{\prime }}\) fixed to 4) almost similar to that reported for pure CaSiO3 perovskite. Its unit-cell volume extrapolated to ambient conditions (V 0 = 187.1 ± 0.4 Å3) is found to be ~2.5 % larger than for the Al-free phase. We observe an increasing unit-cell anisotropy with increasing pressure, which could have implications for the shear properties of Ca-bearing perovskite in cold slabs subducted into the Earth’s mantle. 相似文献
613.
Review of solutions for 3D hydrodynamic modeling applied to aquaculture in South Pacific atoll lagoons 总被引:1,自引:0,他引:1
Andréfouët S Ouillon S Brinkman R Falter J Douillet P Wolk F Smith R Garen P Martinez E Laurent V Lo C Remoissenet G Scourzic B Gilbert A Deleersnijder E Steinberg C Choukroun S Buestel D 《Marine pollution bulletin》2006,52(10):1138-1155
A workshop organized in French Polynesia in November 2004 allowed reviewing the current methods to model the three-dimensional hydrodynamic circulation in semi-enclosed atoll lagoons for aquaculture applications. Mollusk (e.g. pearl oyster, clam) aquaculture is a major source of income for South Pacific countries such as French Polynesia or Cook Islands. This aquaculture now requires a better understanding of circulation patterns to improve the spatial use of the lagoons, especially to define the best area to set larvae collectors. The pelagic larval duration of the relevant species (<20 days) and the size of the semi-closed lagoons (few hundreds of km2) drive the specifications of the model in terms of the spatial and temporal scale. It is considered that, in contrast with fish, mollusk larvae movements are limited and that their cycle occurs completely in the lagoon, without an oceanic stage. Atolls where aquaculture is productive are generally well-bounded, or semi-closed, without significant large and deep openings to the ocean. Nevertheless part of the lagoon circulation is driven by oceanic water inputs through the rim, ocean swells, tides and winds. Therefore, boundary conditions of the lagoon system are defined by the spatial structure of a very shallow rim (exposition and number of hoas), the deep ocean swell climate, tides and wind regimes. To obtain a realistic 3D numerical model of lagoon circulation with adequate forcing, it is thus necessary to connect in an interdisciplinary way a variety of methods (models, remote sensing and in situ data collection) to accurately represent the different components of the lagoon system and its specific boundary conditions. We review here the current methods and tools used to address these different components for a hypothetical atoll of the Tuamotu Archipelago (French Polynesia), representative of the semi-closed lagoons of the South Pacific Ocean. We hope this paper will serve as a guide for similar studies elsewhere and we provide guidelines in terms of costs for all the different stages involved. 相似文献