Two new genera of the ant subfamilies Dorylinae and Ponerinae are collected and described from the tropical rain forest of Xishuangbanna Nature Reserve,Yunnan Province,China. Yunodorylus gen nov belongs to the subf...Two new genera of the ant subfamilies Dorylinae and Ponerinae are collected and described from the tropical rain forest of Xishuangbanna Nature Reserve,Yunnan Province,China. Yunodorylus gen nov belongs to the subfamily Dorylinae,which is monotypic and terrestrial with 2 colonies of the species Y sexspinus sp nov. collected from the soil sample of seasonal rain forest and deciduous monsoon forest. Bannapone gen nov. belongs to the tribe Amblyoponini of Ponerinae,which is also monotypic and known only from a dealate female of the species B mulanae sp nov.collected from a soil sample in semi evergreen monsoon forest.展开更多
An improved transverse Ising model is proposed by taking the depolarization field effect into account. Within the framework of mean-held theory we investigate the behavior of the ferroelectric thin film. Our results s...An improved transverse Ising model is proposed by taking the depolarization field effect into account. Within the framework of mean-held theory we investigate the behavior of the ferroelectric thin film. Our results show that the influence of the depolarization field is to flatten the spontaneous polarization profile and make the films more homogeneous, which is consistent with Ginzburg Landau theory. This fact shows that this model can be taken as an effective model to deal with the ferroelectric film and can be further extended to refer to quantum effect. The competition between quantum effect and depolarization field induces some interesting phenomena on ferroelectric thin films.展开更多
文摘Two new genera of the ant subfamilies Dorylinae and Ponerinae are collected and described from the tropical rain forest of Xishuangbanna Nature Reserve,Yunnan Province,China. Yunodorylus gen nov belongs to the subfamily Dorylinae,which is monotypic and terrestrial with 2 colonies of the species Y sexspinus sp nov. collected from the soil sample of seasonal rain forest and deciduous monsoon forest. Bannapone gen nov. belongs to the tribe Amblyoponini of Ponerinae,which is also monotypic and known only from a dealate female of the species B mulanae sp nov.collected from a soil sample in semi evergreen monsoon forest.
文摘An improved transverse Ising model is proposed by taking the depolarization field effect into account. Within the framework of mean-held theory we investigate the behavior of the ferroelectric thin film. Our results show that the influence of the depolarization field is to flatten the spontaneous polarization profile and make the films more homogeneous, which is consistent with Ginzburg Landau theory. This fact shows that this model can be taken as an effective model to deal with the ferroelectric film and can be further extended to refer to quantum effect. The competition between quantum effect and depolarization field induces some interesting phenomena on ferroelectric thin films.
