全文获取类型
收费全文 | 10416篇 |
免费 | 2715篇 |
国内免费 | 4770篇 |
专业分类
测绘学 | 1308篇 |
大气科学 | 1220篇 |
地球物理 | 2344篇 |
地质学 | 8966篇 |
海洋学 | 1589篇 |
天文学 | 247篇 |
综合类 | 1165篇 |
自然地理 | 1062篇 |
出版年
2024年 | 38篇 |
2023年 | 143篇 |
2022年 | 402篇 |
2021年 | 479篇 |
2020年 | 379篇 |
2019年 | 418篇 |
2018年 | 366篇 |
2017年 | 348篇 |
2016年 | 373篇 |
2015年 | 480篇 |
2014年 | 425篇 |
2013年 | 515篇 |
2012年 | 602篇 |
2011年 | 1106篇 |
2010年 | 831篇 |
2009年 | 985篇 |
2008年 | 656篇 |
2007年 | 873篇 |
2006年 | 1020篇 |
2005年 | 965篇 |
2004年 | 1411篇 |
2003年 | 930篇 |
2002年 | 699篇 |
2001年 | 585篇 |
2000年 | 390篇 |
1999年 | 294篇 |
1998年 | 307篇 |
1997年 | 282篇 |
1996年 | 184篇 |
1995年 | 149篇 |
1994年 | 119篇 |
1993年 | 313篇 |
1992年 | 286篇 |
1991年 | 133篇 |
1990年 | 44篇 |
1989年 | 70篇 |
1988年 | 22篇 |
1987年 | 59篇 |
1986年 | 33篇 |
1984年 | 11篇 |
1982年 | 7篇 |
1978年 | 7篇 |
1977年 | 14篇 |
1976年 | 11篇 |
1954年 | 9篇 |
1950年 | 10篇 |
1943年 | 7篇 |
1940年 | 9篇 |
1937年 | 15篇 |
1933年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
81.
A Computational Model for Velocity Separation in Shallow Sea 总被引:1,自引:0,他引:1
Based on the hydrodynamical feature and the theoretical velocity profiles of tidal flow and vvind-induced flow in shal-low sea, a computational model is established for the first time, which can separate observed velocity into tidal velocity and wind-induced velocity by use of the least square method. With the model, not only the surface velocities of tidal flow and vvind-induced flow are obtained, but also the bed roughness height is determined and the wind velocity above the wa-ter surface is estimated. For verification of the model, the observed velocity in the Yellow River Estuary and the laborato-ry test is separated, then it is applied to the Yangtze River Estuary. All the results are satisfactory. The research results show that the model is simple in method, feasible in process and reasonable in result. The model is a valid approach to analysis and computation of field dala, and can be applied to separate the observed velocity in shallow sea; at the same time, reasonable boundary conditions of th 相似文献
82.
Nicholas Dodd 《中国海洋工程》1995,(2)
A nonlinear short-wave-averaged (surf beat) model is presented. The model is based on that of Roelvink (1993), but the numerical techniques used in the solution are based on the so-called weighted-averaged flux (WAF) method (eg Watson et al., 1992), with time-operator splitting used for the treatment of some of the source terms. This method allows a small number of computational points to be used, and is particularly efficient in modelling breaking long waves. The short-wave (or primary-wave) energy equation is solved using a more traditional Lax-Wendroff technique. Results of validation indicate that the model performs satisfactorily in most respects. 相似文献
83.
You Yage
YuZhi Associated Professor Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou
. Professor Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 《中国海洋工程》1995,(4)
In this paper, the extreme wave loads on an on-shore wave power device are investigated. First, boundary element method is applied to solve the three dimensional potential problem based on the small amplitude wave assumption. Then the motion of the Oscillating Water Column (OWC) inside the device and its laods on the device are calculated in time domain. Several protective techniques often applied are simulated by changing the constraint of the upper end of the chamber of the device. Numerical results are used to judge the effectiveness of these techniques. The investigation shows that damping can not effectively restrain the motion of OWC when the period of incident wave is long, which may cause dangerous loads on the structure. The shut chamber can effectively restrain the motion of OWC, but alternatively cause high pressure in the chamber. A Contracting opening with a Taper (CT) can exhaust a great amount of kinetic energy of OWC, and significantly decrease the loads. It is a promising protective tec 相似文献
84.
The modified hybrid element method (MHEM) is utilized to predict and analyze wave forces on arbitrarily shaped multiple bodies. This method can be applied to waves of all water depths, i. e. shallow, intermediate, and deep waters, on slowly varying seabed. The MHEM employs the ICCG method to save CPU and storage, thus the computation of wave forces for large multi-body systems can be carried out on microcomputers. Numerical results of the present method are compared with experimental data and other solutions. It is shown that the MHEM provides more accurate solutions of the wave forces than other numerical methods do. Therefore, the methodology presented herein can be used in the design of coastal and ocean structures. 相似文献
85.
A vertical two-dimensional turbulence numerical model for the interaction of waves and currents is developed in the paper based on the nonlinear two-equation k-ε model with the VOF method.The one-dimensional equivalent advection velocity and equivalent mixing coefficient are defined and the solving process is introduced:The pollutant concentration field,generated by an instant source in waves and currents,is calculated with the model,and then the equivalent advection velocity and equivalent mixing coefficient are obtained by calculating the time derivative of the mean and variance of pollutant concentration probability distribution.The effects of wave period and wave height on the equivalent mixing coefficient for waves and wave-currents are also investigated. 相似文献
86.
珠江口近30a的SST变化特征分析 总被引:5,自引:0,他引:5
根据珠江口多个定点站近30a表层海水温度(SST)实测资料和气象站观测的气温资料,使用功率谱和小波分析方法,计算分析珠江口SST变化特点、上升趋势及其与El Nino/La Nino的响应关系.结果表明各月SST存在着1-2℃的海域差异,SST的年较差达10~11℃,SST的季节变化与全球气候变暖呈显著相关.1971-2003年SST呈显著上升趋势,其线性上升率为0.019~0.034℃/a,且珠江口外高于口内.El Nino/La Nino事件对珠江口SST变化的影响并非单一的对应关系. 相似文献
87.
88.
Li Yucheng He Ming Professor Dalian University of Technology Dalian Former master student Dalian University of Technology Dalian 《中国海洋工程》1994,(3)
-Based on the extended Morison Equation and model tests, the in-line forces on small square cylinders caused by waves (regular and irregular) and currents are analyzed in detail in this paper. The hydrodynamic coefficient CD and Cu related to KC number and the effect of direction of wave incidence are also given, which can be used in engineering practice. 相似文献
89.
Zhang Jianguo Yan Chi Yan Shuwang
Lecturer Dept. of Hydraulic Eng. Tianjin University Tianjin Associate Professor Dept. of Hydraulic Eng. Tianjin University Tianjin Professor Dept. of Hydraulic Eng. Tianjin University Tianjin 《中国海洋工程》1996,(1)
This paper describes the model tests for determining the axial friction and the lateral resistance of sand to pipeline by using fine sand and prototype pipeline, and the calculation method based on limit analysis theory is verified. The effect of cyclic loading is considered in the test. 相似文献
90.
Wang Deyu Zhang Shanyuan
Associate Prof. Depart of Naval Archi. Ocean Engineering Shanghai Jiaotong University Shanghai
Prof. Research Institute of Applied Mechanics Taiyuan University of Technology Taiyuan 《中国海洋工程》1996,(2)
- The shear failure of a rigid-plastic dented clamped tubular beam under the lateral impact of a mass is investigated. Both the denting and the impact point are in the middle span of the beam. It is assumed that denting does not spread during the shear sliding. Numerical results show that the axial force and lateral deflection of the beam are very small at the moment of the occurence of shear failure, which means that the finite deformation effect can be neglected in the shear failure analysis. Also, some aspects of the initial impact energy are investigated. 相似文献