全文获取类型
收费全文 | 93篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
化学 | 64篇 |
力学 | 2篇 |
数学 | 9篇 |
物理学 | 19篇 |
出版年
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2014年 | 1篇 |
2013年 | 12篇 |
2012年 | 3篇 |
2011年 | 4篇 |
2010年 | 3篇 |
2008年 | 5篇 |
2007年 | 2篇 |
2006年 | 5篇 |
2005年 | 8篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1995年 | 4篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1981年 | 2篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1975年 | 3篇 |
排序方式: 共有94条查询结果,搜索用时 0 毫秒
91.
Chaya Losada M. Paola Scaparra Jesse R. O’Hanley 《European Journal of Operational Research》2012,217(3):519-530
Optimizing system resilience is concerned with the development of strategies to restore a system to normal operations as quickly and efficiently as possible following potential disruption. To this end, we present in this article a bilevel mixed integer linear program for protecting an uncapacitated median type facility network against worst-case losses, taking into account the role of facility recovery time on system performance and the possibility of multiple disruptions over time. The model differs from previous types of facility protection models in that protection is not necessarily assumed to prevent facility failure altogether, but more precisely to speed up recovery time following a potential disruption. Three different decomposition approaches are devised to optimally solve medium to large problem instances. Computational results provide a cross comparison of the efficiency of each algorithm. Additionally, we present an analysis to estimate cost-efficient levels of investments in protection resources. 相似文献
92.
93.
The effect of agitation on the adsorption of acetic acid by activated carbon was tested utilizing an external mass transfer-diffusion
model. Simulated pretreated biomass was contacted with activated carbon under prescribed conditions of temperature and agitation.
Adsorption isotherm studies are presented as well as batch kinetic rate studies. Use of these data enabled the determination
of isotherm constants, an external mass transfer coefficient, and an effective diffusivity for each agitation rate studied.
The external film coefficient results ranged from 33.62 μm/s to a complete absence of external mass transfer resistance, and
the diffusivity results ranged from 0.8625 to 10.70 μm2/s. The optimum combination of no external film resistance, and highest diffusivity, 10.70 μm2/s, occurred at 250 rpm and 25°C. The results of these models and the experimental parameters suggested an efficacious method
and conditions for the removal of this undesirable chemical. 相似文献
94.
Stephen J. Gardiner Mary Hanley 《Proceedings of the American Mathematical Society》2003,131(3):773-779
Let denote a relatively closed subset of the unit ball of . The purpose of this paper is to characterize those sets which have the following property: any harmonic function on which satisfies on (where 0$">) can be locally uniformly approximated on by a sequence of harmonic polynomials which satisfy the same inequality on . This answers a question posed by Stray, who had earlier solved the corresponding problem for holomorphic functions on the unit disc.