全文获取类型
收费全文 | 68篇 |
免费 | 4篇 |
专业分类
测绘学 | 3篇 |
大气科学 | 6篇 |
地球物理 | 28篇 |
地质学 | 13篇 |
海洋学 | 6篇 |
天文学 | 8篇 |
综合类 | 1篇 |
自然地理 | 7篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2016年 | 5篇 |
2015年 | 1篇 |
2014年 | 3篇 |
2013年 | 4篇 |
2012年 | 3篇 |
2011年 | 5篇 |
2010年 | 1篇 |
2009年 | 4篇 |
2008年 | 8篇 |
2007年 | 7篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2000年 | 2篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1995年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1979年 | 1篇 |
1977年 | 3篇 |
1973年 | 1篇 |
排序方式: 共有72条查询结果,搜索用时 0 毫秒
71.
The study of nonequilibrium, self-gravitating, compressible, homogeneous and uniformly rotating gaseous ellipsoidal models
is extended from parallel to nonparallel angular velocity and vorticity. The differential equations of motion governing these
models are numerically integrated over ranges of initial values of angular velocity and vorticity.
The dynamical behaviour of the ellipsoid is found to be almost unchanged when the initial values of Ω3/Ω3,e and λ3/λ3,e are interchanged, where λ is a function of the vorticity, Ω3 is the angular velocity along the x3 axis, and Ω3,e and λ3,e are equilibrium values.
Models with the same initial value of | Ω3/Ω3,e - λ3/λ3,e | have similar dynamical behaviour. When this value becomes larger, the oscillations of the semi-axes are larger and are
more nonperiodic.
For all models, the ellipsoidal configuration is maintained at all times.
The magnitude of Ωl depends on the difference between the values of the semi-axes am and an, where l, m, and n are cyclic. The smaller this difference is, the larger the angular velocity along the third axis. Thus
whenever the model approaches a spheroidal configuration, there may be a large and rapid increase in the angular velocity
along the axis of ‘symmetry’.
The last two properties, namely the maintenance of the ellipsoidal configuration and the large increase in angular velocity
of the model, configuration also hold in the model (T.T.Chia and S.Y.Pung, 1995, Astrophys.\ Space Sci., 229, 215.) with parallel
angular velocity and vorticity.
However, unlike the earlier model, Ω2 and Ω3 are observed to reverse their directions at certain instants during the oscillations; this may have interesting astrophysical
implications.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
72.
With the concept of generalized plasticity, a constitutive model for describing the deformation behavior of sandstone is proposed in this paper. This proposed model is characterized by the following features: (i) nonlinear elasticity under hydrostatic and shear loading; (ii) associated flow rule for pre‐peak simulation; (iii) substantial plastic deformation during shear loading; and (iv) significant shear dilation and distortion prior to the failure state. This model requires 10 material parameters, including three for elasticity and seven for plasticity. All of the parameters can be determined, in a straightforward manner, by the suggested procedures. The proposed model has been validated by comparing the triaxial test results of the Mushan sandstone under different hydrostatic stress, different stress paths, and cyclic loading condition. It is also versatile in simulating the deformation behaviors of two other sandstones. Upon slight modification of the model, the post‐peak behavior of sandstone can be reasonably predicted using proposed model. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献