全文获取类型
收费全文 | 209篇 |
免费 | 20篇 |
国内免费 | 7篇 |
专业分类
测绘学 | 1篇 |
大气科学 | 14篇 |
地球物理 | 82篇 |
地质学 | 7篇 |
海洋学 | 86篇 |
天文学 | 44篇 |
综合类 | 1篇 |
自然地理 | 1篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 5篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 2篇 |
2015年 | 3篇 |
2014年 | 3篇 |
2013年 | 18篇 |
2012年 | 6篇 |
2011年 | 12篇 |
2010年 | 12篇 |
2009年 | 24篇 |
2008年 | 15篇 |
2007年 | 13篇 |
2006年 | 11篇 |
2005年 | 5篇 |
2004年 | 7篇 |
2003年 | 15篇 |
2002年 | 7篇 |
2001年 | 5篇 |
2000年 | 15篇 |
1999年 | 4篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 19篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1977年 | 2篇 |
排序方式: 共有236条查询结果,搜索用时 31 毫秒
231.
Evelyne Roueff Guillaume Pineau Des Forêts David R. Flower 《Astrophysics and Space Science》1995,233(1-2):125-137
Shock waves perturb the chemical state of the interstellar gas. We consider the effects of C-shocks on the composition of molecular clouds, for a range of values of the pre-shock gas density and magnetic induction. The time required to re-establish equilibrium in the post-shock gas depends on the initial conditions and can become very large. The significance of the two known chemical phases of dark clouds and of bistability is considered in this context. 相似文献
232.
Effect of turbulence on interplanetary shock waves propagation is considered. It is shown that background turbulence results in the additional shock wave deceleration which may be comparable with the deceleration due to plasma sweeping. The turbulent deceleration is connected with the energy losses due to the strong turbulence amplification behind the moving shock front. 相似文献
233.
Diana J. M. Greenslade Eric W. Schulz Jeff D. Kepert Graham R. Warren 《Journal of Atmospheric & Ocean Science》2005,10(3):261-287
Recent work has demonstrated that surface marine winds from the Bureau of Meteorology's operational Numerical Weather Prediction (NWP) systems are typically underestimated by 5 to 10%. This is likely to cause significant bias in modelled wave fields that are forced by these winds. A simple statistical adjustment of the wind components is shown to reduce the observed bias in Significant Wave Height considerably. The impact of increasing the vertical resolution of the NWP model and assimilating scatterometer data into the model is assessed by comparing the resulting forecast wind and waves to observations. It is found that, in general, the inclusion of scatterometer observations improves the accuracy of the surface wind forecasts. However, most of the improvement is shown to arise from the increased number of vertical levels in the atmospheric model, rather than directly from the use of the observations. When the wave model is forced with surface winds from the NWP model that includes scatterometer data, it is found that the scatterometer assimilation does not reduce the systematic bias in surface wave forecasts, but that the random errors are reduced. 相似文献
234.
超低频地质遥感探测装置在瓦斯气探测中的应用 总被引:5,自引:0,他引:5
由于瓦斯气的富集,引起富集区域的视电阻率升高。瓦斯气压力越大,其视电阻率就越高。在同一地区,瓦斯气的赋存导致物性异常,特别是视电阻率及密度异常与瓦斯气的富集程度有非常密切的关系,呈现一定的规律。据此,在地面使用超低频地质遥感探测仪,即可探测出地下瓦斯气的富集范围,预测其富集程度。勘探成果可做为煤矿开采时采取抽排瓦斯气措施的依据,做好瓦斯事故的预防工作。 相似文献
235.
Déborah Idier Rodrigo Pedreros Carlos Oliveros Aldo Sottolichio Lorraine Choppin Xavier Bertin 《Comptes Rendus Geoscience》2006,338(10):718-726
This paper investigates the relative influence of waves, wind-induced current and tidal current on the sediment mobility of a macro-tidal environment belonging to the inner shelf seaward of the ‘pertuis Charentais’ (France). This study, mainly based on three-week hydrodynamic in-situ measurements, shows that, for a water depth of 23 m, the swell (rather than wind waves) orbital velocity is large enough to initiate the motion of medium sands that are then transported by currents. Estimations show that medium sand of 0.2 mm is transported during 92% of the measurements, whereas coarse sand and gravel move sporadically, during storm, synchronously with spring tides. Further more, bedload fluxes appear strongly larger when waves are taken into account (370 times larger for 0.2-mm sands). To cite this article: D. Idier et al., C. R. Geoscience 338 (2006). 相似文献
236.
Wind- and current-driven flotsam, oil spills, pollutants, and nutrients, approaching the nearshore will frequently appear to slow down/park just beyond the break zone, where waves break. Moreover, the portion of these tracers that beach will do so only after a long time. Explaining why these tracers park and at what rate they reach the shore has important implications on a variety of different nearshore environmental issues, including the determination of what subscale processes are essential in computer models for the simulation of pollutant transport in the nearshore. Using a simple model we provide an explanation for the underlying mechanism responsible for the parking of tracers, not subject to inertial effects, the role played by the bottom topography, and the non-uniform dispersion which leads, in some circumstances, to the eventual landing of all or a portion of the tracers. We refer to the parking phenomenon in this environment as nearshore sticky waters. 相似文献