Chinese Physics B,2010年19(3):55-60 ISSN：1674-1056
[Kang Guo-Dong; Ouyang Xi-Cheng; Deng Xiao-Juan; Fang Mao-Fa] Hunan Normal Univ, Coll Phys & Informat Sci, Changsha 410081, Hunan, Peoples R China.;[Ouyang Xi-Cheng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Huang Li-Yuan] Changsha Univ, Dept Elect & Commun Engn, Changsha 410003, Hunan, Peoples R China.
[Fang Mao-Fa] Hunan Normal Univ, Coll Phys & Informat Sci, Changsha 410081, Hunan, Peoples R China.
entanglement sudden death;concurrence;two-photon Jaynes-Cummings model;Kerr-like medium
In this paper, the entanglement dynamics of a double two-photon Jaynes-Cummings model with Kerr-like medium is investigated. It is shown that initial entanglement has an interesting subsequent time evolution, including the so-called entanglement sudden death effect. It is also shown analytically that the Kerr-like medium can repress entanglement sudden death and enhance the degree of atom-atom entanglement. A more interesting fact is that the Kerr effect is more obvious when each of the two cavities with have the Kerr-like medium than only one of them with the Kerr-like medium.
We performed first-principles calculations to quantify the effect of 26 transition metals on the mechanical properties of vanadium (V) alloys. The generalized stacking-fault (GSF) energies of the solutes were evaluated in three slip systems. Solutes with similar atomic radii to that of V present high GSF energies, which increase the energy barrier for double-kink nucleation and result in excellent strengthening effect. This size effect indicates that noble metals can significantly improve the mechanical strength of V alloys.
Computers & Mathematics with Applications,2011年61(6):1687-1699 ISSN：0898-1221
[Chen, Haibo; Liu, Zhisu] Cent S Univ, Dept Math, Changsha 410075, Hunan, Peoples R China.;[Zhou, Tiejun] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
[Chen, Haibo] Cent S Univ, Dept Math, Changsha 410075, Hunan, Peoples R China.
Dirichlet boundary value problem;Impulsive effects;Variational methods;Critical points
In this paper, we study the existence of solutions for a class of second-order impulsive differential equation. By using the critical point theorem of Y. Jabri and an even functional theorem, we give some new criteria to guarantee that the impulsive differential equation has at least one solution, infinitely many solutions under the assumption that a nonlinear term satisfies sublinear, superlinear, asymptotically linear, respectively. Some recent results are extended and conditions of assumptions are simplified. Finally, some examples are presented to illustrate our main results.
Stage extraction;Capsaicinoids;Red pigments;Carotenoids;Fresh red pepper (Capsicum)
A method for stage extraction of capsaicinoids and red pigments from fresh red peppers (FRPs) was developed in this work. Firstly, capsaicinoids were extracted from FRPs without any drying process by 40%-50% ethanol. Then red colorants without piquancy were extracted from the residues after removal of capsaicinoids using 95% ethanol as solvent with the conditions of 90 degrees C of temperature of water bath, 4 mL/g of ratio of solvent to material and 120 min of extraction time. The yield of red pigments were 89.8% of total content of red colorants in FRPs, which is about 2.2 times that of dry red peppers (DRPs) dried from equivalent FRPs. Compared with conventional methods, the new processes were simple, but gave a high yield of red pigments without remain of toxic solvent. (C) 2014 Elsevier Ltd. All rights reserved.