全文获取类型
收费全文 | 13583篇 |
免费 | 3037篇 |
国内免费 | 3831篇 |
专业分类
测绘学 | 1662篇 |
大气科学 | 1517篇 |
地球物理 | 4269篇 |
地质学 | 8449篇 |
海洋学 | 2021篇 |
天文学 | 235篇 |
综合类 | 1075篇 |
自然地理 | 1223篇 |
出版年
2024年 | 34篇 |
2023年 | 145篇 |
2022年 | 365篇 |
2021年 | 515篇 |
2020年 | 547篇 |
2019年 | 764篇 |
2018年 | 591篇 |
2017年 | 678篇 |
2016年 | 683篇 |
2015年 | 792篇 |
2014年 | 990篇 |
2013年 | 890篇 |
2012年 | 984篇 |
2011年 | 1044篇 |
2010年 | 937篇 |
2009年 | 981篇 |
2008年 | 921篇 |
2007年 | 1027篇 |
2006年 | 1008篇 |
2005年 | 852篇 |
2004年 | 806篇 |
2003年 | 671篇 |
2002年 | 529篇 |
2001年 | 451篇 |
2000年 | 451篇 |
1999年 | 427篇 |
1998年 | 402篇 |
1997年 | 342篇 |
1996年 | 291篇 |
1995年 | 247篇 |
1994年 | 242篇 |
1993年 | 179篇 |
1992年 | 171篇 |
1991年 | 111篇 |
1990年 | 87篇 |
1989年 | 117篇 |
1988年 | 60篇 |
1987年 | 46篇 |
1986年 | 25篇 |
1985年 | 14篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1972年 | 1篇 |
1954年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 22 毫秒
141.
142.
1998年夏季季风爆发前后南海上层环流的诊断分析 总被引:4,自引:0,他引:4
基于1998年南海季风试验(SCSMEX,South China Sea Monsoon Experiment)期间2个强化观测航次(4-5月及6-7)所获温盐深(CTD)资料,利用一个改进逆模式研究了夏季季风爆发前后南海环流的演变特征。诊断计算表明,在此期间南海环流主要表现为两脊两槽型,即越南以东和菲律宾以西呈反气旋式环流,南海北部和南海中部呈气旋式环流。但对局部区域而言,可以发现在季风爆发前后其环流结构有明显的差异。上述计算结果亦与等压面上海水密度分布的定性分析结果及同期观测的ADCP资料进行了比较,结果表明模式计算所得到的南海上层环流主要特征与定性分析结果及实测资料大体一致,诊断结果可作为南海上层季风环流演变机制研究的依据。 相似文献
143.
This paper describes the simulation of the flow of a viscous incompressible Newtonian liquid with a free surface. The Navier–Stokes equations are formulated using a streamline upwind Petrov–Galerkin scheme, and solved on a Q-tree-based finite element mesh that adapts to the moving free surface of the liquid. Special attention is given to fitting the mesh correctly to the free surface and solid wall boundaries. Fully non-linear free surface boundary conditions are implemented. Test cases include sloshing free surface motions in a rectangular tank and progressive waves over submerged cylinders. 相似文献
144.
随机激励下非线性海洋结构物响应分析方法研究进展 总被引:1,自引:0,他引:1
对在随机载荷作用下非线性海洋结构物的运动响应分析的各种方法进行了综述,对有些方法的基本原理做了阐述,并指出一些最新的研究进展和今后进一步研究的方向。 相似文献
145.
146.
A numerical procedure is described for predicting the motion and structural responses of tension leg platforms (TLPs) in waves. The developed numerical approach, in a TLP is assumed to be flexible instead of rigid, is based on a combination of the three dimensional source distribution method and the finite-element method. The hydrodynamic interactions among TLP members, such as columns and pontoons, are included in the motion and structural response analysis. Numerical results are compared with the experimental and numerical ones. The results of comparison confirmed the validity of the proposed approach. 相似文献
147.
A higher order panel method based on B-spline representation for both the geometry and the solution is developed for the analysis of steady flow around marine propellers. The self-influence functions due to the normal dipole and the source are desingularized through the quadratic transformation, and then shown to be evaluated using conventional numerical quadrature. By selecting a proper order for numerical quadrature, the accuracy of the present method can be increased to the machine limit. The far- and near-field influences are shown to be evaluated based on the same far-field approximation, but the near-field solution requires subdividing the panels into smaller subpanels continuously, which can be effectively implemented due to the B-spline representation of the geometry. A null pressure jump Kutta condition at the trailing edge is found to be effective in stabilizing the solution process and in predicting the correct solution. Numerical experiments indicate that the present method is robust and predicts the pressure distribution on the blade surface, including very close to the tip and trailing edge regions, with far fewer panels than existing low-order panel methods. 相似文献
148.
吹扫-捕集气相色谱法测定海水中挥发性卤代烃 总被引:6,自引:0,他引:6
挥发性卤代烃(VHC)是大气中的痕量气体,对臭氧层损耗和温室效应有重要作用。海洋是大气中VHC的主要自然排放源,开展海洋VHC的研究有助于了解海洋对大气VHC和全球变暖的贡献。本文建立了吹扫-捕集与气相色谱-微池电子捕获检测器联用技术(P-T-GC-(ECD)分析海水中6种VHC的方法,确定了吹扫-捕集条件和气相色谱分离条件。该方法的检测限在0.003~0.369 ng.L-1之间;相对标准偏差是1.83~3.97;加标回收率为98.1%~110.2%;相关系数在0.997 3~0.999 8之间。可准确地测定海水中6种VHC。 相似文献
149.
150.
A Reconstruction of Observed Profiles in the Sea East of Japan Using Vertical Coupled Temperature-Salinity EOF Modes 总被引:4,自引:0,他引:4
It is important to estimate hard-to-observe parameters in the ocean interior from easy-to-observe parameters. This study therefore
demostrates a reconstruction of observed temperature and salinity profiles of the sea east of Japan (30°≈40°N, 140°≈150°E).
The reconstruction was done by estimating suboptimal state from several values of the observed profiles and/or sea surface
dynamic height (SDH) calculated from the profiles. The estimation used a variational method with vertical coupled temperature-salinity
empirical orthogonal function (EOF) modes. Profiles of temperature and salinity in the subtropical region are effectively
reconstructed from in situ temperature profile data, or sea surface temperature (SST) and SDH. For example, the analyzed temperature field from SST
and SDH has an accuracy to within 1°C in the subtropical region. Salinity in the sea north of Kuroshio, however, is difficult
to estimate because of its complex variability which is less correlated with temperature than in the subtropical region. Sea
surface salinity is useful to estimate the subsurface structure. We also show the possibility that the estimation is improved
by considering nonlinearity in the equation calculating SDH from temperature and salinity analysis values in order to examine
the misfit between analysis and observation. Analysis using TOPEX/POSEIDON altimetry data instead of SDH was also performed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献