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翟红村  李晓凤  杜军毅  姬广富 《中国物理 B》2012,21(5):57102-057102
The mechanical stability,elastic,and thermodynamic properties of the anti-perovskite superconductors MNNi 3(M=Zn,Mg,Al) are investigated by means of the first-principles calculations.The calculated structural parameters and elastic properties of MNNi 3 are in good agreement with the experimental and the other theoretical results.From the elastic constants under high pressure,we predict that ZnNNi 3,MgNNi 3,and AlNNi 3 are not stable at the pressures above 61.2 GPa,113.3 GPa,and 122.4 GPa,respectively.By employing the Debye model,the thermodynamic properties,such as the heat capacity and the thermal expansion coefficient,under pressures and at finite temperatures are also obtained successfully.  相似文献   
2.
夹心半群S(X,Y,θ)上的α-同余   总被引:5,自引:0,他引:5  
裴惠生  翟红村  金勇 《数学学报》2004,47(2):371-378
本文讨论了夹心半群T(X,Y,θ)上的α-同余与集合Y上Tθ-等价关系之间的联系,证明了对于每个Tθ-等价关系E,夹心半群同余格C(T(X,Y,θ))的完全子格γ-1(E)中的最大元是一个α-同余,并判明Symons同余l,d都是α-同余.对于某些拓扑空间X,Y,确定了夹心半群S(X,Y,θ)上的最小(最大)真α-同余.  相似文献   
3.
A first-principles study on the mechanical stability, elastic and thermodynamic properties of WN2 with P63/mmc and P-6m2 phases are reported using the pseudo potential plane wave method within the generalized gradient approximation. The calculated equilibrium parameters are in good agreement with the available theoretical data. A complete elastic tensor and crystal anisotropies of the ultra-incompressible WN2 are determined in the wide pressure range. By the elastic stability criteria, it is predicted that P63/mmc and P-6m2 phases in WN2 are not stable above 175.1 GPa and 170.1 GPa, respectively. Finally, by using the quasiharmonic Debye model, the isothermal and adiabatic bulk modulus, and the heat capacity of WN2 are also successfully obtained.  相似文献   
4.
水发汗冷却控制模型解的稳定性   总被引:1,自引:0,他引:1  
本文研究了带活动边界的水发汗控制系统解对初边值条件及控制参数的连续依赖性 ,稳定性 .  相似文献   
5.
夹心半群T(X,Y,θ)上的最小真同余   总被引:4,自引:0,他引:4  
裴惠生  翟红村  金勇 《数学进展》2004,33(3):284-290
本文讨论了夹心半群T(X,Y,θ)上的同余与集合Y上T^θ-等价关系之间的联系,建立了从夹心半群的同余格C(T(X,Y,θ))到Y上的T^θ-等价关系格吃(y)的满同态C和从Teq^θ(Y)到C(T(X,Y,θ))的单同态γ-讨论了Y上最小真T^θ-等价关系以及半群T(X,Y,θ)上最小真同余存在的条件.  相似文献   
6.
The mechanical stability,elastic,and thermodynamic properties of the anti-perovskite superconductors MNNi 3(M=Zn,Mg,Al) are investigated by means of the first-principles calculations.The calculated structural parameters and elastic properties of MNNi 3 are in good agreement with the experimental and the other theoretical results.From the elastic constants under high pressure,we predict that ZnNNi 3,MgNNi 3,and AlNNi 3 are not stable at the pressures above 61.2 GPa,113.3 GPa,and 122.4 GPa,respectively.By employing the Debye model,the thermodynamic properties,such as the heat capacity and the thermal expansion coefficient,under pressures and at finite temperatures are also obtained successfully.  相似文献   
7.
本文研究了带活动边界的水发汗控制系统 ,用动态有限元的方法建立了水发汗控制模型  相似文献   
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