全文获取类型
收费全文 | 3191篇 |
免费 | 669篇 |
国内免费 | 848篇 |
专业分类
测绘学 | 226篇 |
大气科学 | 606篇 |
地球物理 | 1356篇 |
地质学 | 1365篇 |
海洋学 | 496篇 |
天文学 | 136篇 |
综合类 | 224篇 |
自然地理 | 299篇 |
出版年
2024年 | 17篇 |
2023年 | 45篇 |
2022年 | 114篇 |
2021年 | 115篇 |
2020年 | 183篇 |
2019年 | 192篇 |
2018年 | 176篇 |
2017年 | 134篇 |
2016年 | 159篇 |
2015年 | 175篇 |
2014年 | 178篇 |
2013年 | 256篇 |
2012年 | 228篇 |
2011年 | 233篇 |
2010年 | 195篇 |
2009年 | 197篇 |
2008年 | 186篇 |
2007年 | 204篇 |
2006年 | 192篇 |
2005年 | 183篇 |
2004年 | 170篇 |
2003年 | 138篇 |
2002年 | 138篇 |
2001年 | 106篇 |
2000年 | 103篇 |
1999年 | 89篇 |
1998年 | 86篇 |
1997年 | 85篇 |
1996年 | 87篇 |
1995年 | 61篇 |
1994年 | 70篇 |
1993年 | 74篇 |
1992年 | 36篇 |
1991年 | 21篇 |
1990年 | 14篇 |
1989年 | 16篇 |
1988年 | 17篇 |
1987年 | 15篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1972年 | 2篇 |
1954年 | 1篇 |
排序方式: 共有4708条查询结果,搜索用时 281 毫秒
21.
Surface waves are the roughness element of the ocean surface. The parameterization of the drag coefficient of the ocean surface is simplified by referencing to wind speed at an elevation proportional to the characteristic wavelength. The dynamic roughness is analytically related to the drag coefficient. Under the assumption of fetch limited wave growth condition, various empirical functions of the dynamic roughness can be converted to equivalent expressions for comparison. For datasets covering a wide range of the dimensionless frequency (inverse wave age), it is important to account for the variable rate of wave development at different wave ages. As a result, the dependence of the Charnock parameter on wave age is nonmonotonic. Finally, the analysis presented here suggests that the significant wave steepness is a sensitive property of the ocean surface and a single variable normalization of the dynamic roughness using a wavelength or wave height parameter actually produces more robust functions than bi-variable normalizations using wave height and wave slope. 相似文献
22.
In this paper, a new definition of structure system redundancy is proposed in view of the various measures for structure redundancy. By introducing the terms of structure system failure at the mechanism level and equivalent reliability index, the safety for existing offshore platforms can be evaluated by the semi-probabilistic method presented in this paper. Some numerical examples are given and satisfactory results have been obtained. 相似文献
23.
24.
动荷载作用下海底粉土的孔压响应及其动强度 总被引:5,自引:0,他引:5
本文选用近海分布较广的粉土为研究对象 ,利用室内动三轴试验结果 ,找出动荷载作用下粉土的动应力应变关系 ,分析模拟波浪荷载作用下粉土中的孔压响应、临界循环次数 ,确定波浪作用下粉土的应力状态、破坏临界循环次数 ,判断不同深度处的粉土发生液化的可能性及发生液化所需要的时间 ;研究粉土在动荷载作用下的强度降低 ,为海上工程设计和施工提供科学依据。 相似文献
25.
The effect of the cone spacing of a conieal structure on the ice force is studied by model experiments. The ice force reduction coefficient presented in this paper expresses the relationship between the ice force and the arrangement of cones. The experiments prove that the mode of the ice failure before the boundary of upward-downward bending cone (UDBC) is crushing. A conclusion can also be drawn from the experiments that the ice force on the boundary of UDBC is by far less than that on a vertical pile with the same diameter. Moreover, the ice force frequencies on upright and inve-rted cones are obtained under the field condition of the platform JZ20-2, respectively. The results show that the alterna-tion of the ice force on UDBC can hardly induce resonance of platform JZ20-2. 相似文献
26.
Analysis of Dynamic Characteristics of Submarine Free Spanning Pipelines by Complex Damping Method 总被引:2,自引:0,他引:2
Considering the effect of the internal flowing fluid and the external marine environmental condition, the differential equation for the vortex-induced vibration (V1V) of the free spanning pipeline is derived and is discretized by the Hermit interpolation function. The free vibration equation with the damping term is solved by the complex damping method for the natural frequency, and then the effect of fluid damping on the natural frequency of the free spanning pipeline is analyzed.The results show that fluid damping has a significant influence on the damped natural frequency of the free spanning pipeline in the lock-in state, while it has little influence when the pipeline is out of the lock-in state. In the meantime,the change of the free span length has the same effect on the damped natural frequency and the undamped natural frequency. 相似文献
27.
应用多组有理数时滞离散系统的比较原理和频域法,将多组有理数时滞区间系数离散系统化为多组有理数时滞定常离散系统,以判定其时滞无关稳定性,并举例说明了新定理的有效性和实用性。 相似文献
28.
若把河口潮位时间序列简单地看为单输入和输出线性系统模型的输入输出信号,借助频谱分析可以将它们在频域内的关系建立起来,用来进行潮位序列的插补,带通滤波技术的应用可使模型的计算精度大大提高 相似文献
29.
30.
Sloshing in a two-dimensional rectangular tank in horizontal motion is analysed based on the velocity potential theory. It is found that even when the first-order excitation is away from all the natural frequencies of the tank, second-order resonance can still occur when the sum-frequency or the difference-frequency is equal to one of the natural frequencies corresponding to the even mode. However, such resonance is not excited when the sum or difference frequency is equal to the natural frequency of an odd mode. 相似文献