全文获取类型
收费全文 | 122篇 |
免费 | 3篇 |
国内免费 | 2篇 |
专业分类
化学 | 52篇 |
晶体学 | 2篇 |
力学 | 5篇 |
数学 | 25篇 |
物理学 | 43篇 |
出版年
2022年 | 3篇 |
2021年 | 16篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 16篇 |
2015年 | 7篇 |
2014年 | 3篇 |
2013年 | 9篇 |
2012年 | 11篇 |
2011年 | 7篇 |
2010年 | 5篇 |
2009年 | 5篇 |
2008年 | 1篇 |
2007年 | 1篇 |
2006年 | 3篇 |
2005年 | 4篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 1篇 |
1995年 | 4篇 |
1990年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 3篇 |
排序方式: 共有127条查询结果,搜索用时 390 毫秒
71.
We provide a complete classification of all tilting modules and tilting classes over almost perfect domains, which generalizes the classifications of tilting modules and tilting classes over Dedekind and 1-Gorenstein domains. Assuming the APD is Noetherian, a complete classification of all cotilting modules is obtained (as duals of the tilting ones). 相似文献
72.
Jawad Y. Abuhlail 《代数通讯》2013,41(11):4801-4838
In this paper, we introduce and investigate semicorings over associative semirings and their categories of semicomodules. Our results generalize old and recent ones on corings over rings and their categories of comodules. The generalization is not straightforward and even subtle at several places due to the nature of the base category of commutative monoids which is neither Abelian (not even additive) nor homological, and has no nonzero injective objects. To overcome these and other difficulties, a combination of methods and techniques from categorical, homological and universal algebra is used including a new notion of exact sequences of semimodules over semirings. 相似文献
73.
Mirza Jawad Ghafoor Salman Ahmad Waqas Salman Ahmad Qureshi Khurram Karim 《Optical Review》2021,28(5):525-537
Optical Review - Nodes in a body area network (BAN) are miniature wearable or implantable battery-powered wireless sensors which continuously transmit real-time vital physiological data of a... 相似文献
74.
Optical Review - In this paper, we propose a cost-efficient single mode fiber-free space optics (SMF-FSO) based hybrid $$32 \times 2~\text{Gbps}$$ wavelength division multiplexed passive optical... 相似文献
75.
76.
An axisymmetric formulation for modeling three-dimensional deformation
of structures of revolution is presented. The axisymmetric deformation
model is described using the cylindrical coordinate system. Large
displacement effects and material nonlinearities and anisotropy are
accommodated by the formulation. Mathematical derivation of the
formulation is given, and an example is presented to demonstrate
the capabilities and efficiency of the technique compared to the
full three-dimensional model. 相似文献
77.
This paper is devoted to study the modified holographic dark energy model by taking its different aspects in the flat Kaluza-Klein universe. We construct the equation of state parameter which evolutes the universe from quintessence region towards the vacuum. It is found that the modified holographic model exhibits instability against small perturbations in the early epoch of the universe but becomes stable in the later times. We also develop its correspondence with some scalar field dark energy models. It is interesting to mention here that all the results are consistent with the present observations. 相似文献
78.
79.
This paper carries out the integration of a few nonlinear wave equations to obtain topological as well as non-topological soliton solutions. The mathematical techniques used to obtain the soliton solutions are He’s variational iteration method, the tanh method and the ansatz method. The nonlinear wave equations that are studied are coupled mKdV equations, Drinfeld-Sokolov equation and its generalized version. Finally, some numerical simulations are given to support the analytical solutions. 相似文献
80.
Effect of bond-length alternation in molecular wires 总被引:2,自引:0,他引:2
Kushmerick JG Holt DB Pollack SK Ratner MA Yang JC Schull TL Naciri J Moore MH Shashidhar R 《Journal of the American Chemical Society》2002,124(36):10654-10655
Current-voltage (I-V) characteristics for metal-molecule-metal junctions formed from three classes of molecules measured with a simple crossed-wire molecular electronics test-bed are reported. Junction conductance as a function of molecular structure is consistent with I-V characteristics calculated from extended Hückel theory coupled with a Green's function approach, and can be understood on the basis of bond-length alternation. 相似文献