共查询到20条相似文献,搜索用时 78 毫秒
1.
利用相对论平均场理论,考虑了σ*,Ф介子及重子八重态{N,P,A,∑^-,∑0,∑+,Ξ^-,Ξ^0},研究了中子星的性质.发现当考虑了σ*,Ф介子的贡献时,超子出现的临界重子数密度降低了,超子数目增加了,超子星的转变密度poH降低了,物态方程变软,最大质量变小而相应的中子星半径增大,中子星的中心重子数密度、中心能量密度和中心压强均降低. 相似文献
2.
3.
4.
BN纳米管——一种新型的纳米材料 总被引:1,自引:0,他引:1
文章综述了BN纳米管的最新进展,介绍了BN纳米管的结构和制备技术发展情况,包括电弧放电,电弧熔融,激光烧蚀,机械球磨,碳纳米管取代反应答经学反应法,探讨了BN纳米管的机械和电学性质,并展望了BN纳米管的应用前景,提出了BN纳米管的发展方向。 相似文献
5.
6.
7.
矩孔金属光栅矢量模式理论的数值计算 总被引:1,自引:0,他引:1
根据矩孔金属光栅的矢量模式理论,计算了不同入射方向,波长及偏振态情况下衍射场的分布,研究了不同光栅结构对衍射效率,偏振态变化的影响;同时,根据实际需要,加工制作了一批不同深度的矩孔光栅样品,进行了实验测量,并将计算值与实验值进行了比较,两者基本相符。 相似文献
8.
L.B.Magalas 《物理学进展》2006,26(3):258-276
本文广泛地收集了有关内耗,力学谱,超声衰减方面的专著及会议文集。反映了20世纪在此领域的英文,俄文出版的书籍。也列出了历次国际会议及前苏联,乌克兰,中国的国内会议。文中包括了点缺陷,电,声子,位错,晶界,电畴等诸方面在内的内耗与力学谱工作。 相似文献
9.
用光线矩阵元描述X射线激光输出特性 总被引:1,自引:1,他引:0
采用矩阵光学方法,研究了串接多靶,弯曲靶加反射镜“双程放大”X射线激光输出特性,给出了发散角普遍公式,分析了电子密度梯度分布,反射镜角失调对X射线激光输出场分布的影响,所得结果与已有实验符合较好,最后,对如何从靶,X光学元件空间排布来实现衍射极限的输出发散角提出了新的设想,作了半定量的探讨。 相似文献
10.
简介了物理学家阿贝的生平,回顾了阿贝对成像原理的研究,对显微镜理论和技术的发展,特别是他提出了正弦条件,进行了复消色差的设计,介绍了他研制一些其他光学仪器装置,以及了为物理学发展作出的卓越贡献。 相似文献
11.
12.
Summary After a critical analysis of the literature, the traditional formulation of the phase rule proposed by Gibbs is stated in
a different form and is proved rigorously, together with Gibbs' conjecture on the maximum number of coexisting phases. A new
statement of Gibbs' phase rule is proved for closed systems. Then, Hatsopoulos-Keenan's formulation of the phase rule is restated
and proved, both for open and for closed systems. The whole treatment of the phase rule presented in this paper holds both
in the presence and in the absence of chemical reactions. 相似文献
13.
Here we give a natural extension of the duality principle for the curvature tensor of pointwise pseudo-Riemannian Osserman manifolds. We proved that this extended duality principle holds under certain additional assumptions. Also, it is proved that duality principle holds for every four-dimensional Osserman manifold. 相似文献
14.
Masuo Suzuki 《Communications in Mathematical Physics》1994,163(3):491-508
A general theorem is proved concerning the convergence of decompositions of exponential operators in a Banach space (or normed space). As a corollary, the convergence of fractal decompositions is proved. The convergence of generalized. Trotter-like formulas is also shown to result from the general theorem. 相似文献
15.
Pierre-A. Vuillermot 《Physics letters. A》1977,61(1):9-12
Absence of ordering is proved for a class of one- and two-dimensional quenched random systems including the Edwards-Anderson model for spin-glasses; a new inequality for random ferromagnets is proved using FKGP-inequalities and very recent correlation inequalities due to Sherman. 相似文献
16.
V. A. Malyshev 《Communications in Mathematical Physics》1975,40(1):75-82
The existence of a phase transition of the first kind is proved for anisotropic classical Heisenberg ferromagnet in two or more dimensions and with arbitrary parameter of anisotropy α, |α|<1; a similar fact is proved for much more general lattice spin systems. 相似文献
17.
18.
For the Enskog equation in a box an existence theorem is proved for initial data with finite mass, energy, and entropy. Then, by letting the diameter of the molecules go to zero, the weak convergence of solutions of the Enskog equation to solutions of the Boltzmann equation is proved. 相似文献
19.
The eigenfunction system of infinite-dimensional Hamiltonian operators appearing in the bending problem of rectangular plate with two opposites simply supported is studied. At first, the completeness of the extended eigenfunction system in the sense of Cauchy's principal value is proved. Then the incompleteness of the extended eigenfunction system in general sense is proved. So the completeness of the symplectic orthogonal system of the infinite-dimensional Hamiltonian operator of this kind of plate bending equation is proved. At last the general solution of the infinite dimensional Hamiltonian system is equivalent to the solution function system series expansion, so it gives to theoretical basis of the methods of separation of variables based on Hamiltonian system for this kind of equations. 相似文献
20.
A. Verbeure 《Communications in Mathematical Physics》1984,95(3):301-305
For classical lattice systems, an infinite set of jump-processes satisfying the condition of detailed balance is found. It is proved that any state invariant for these processes is an equilibrium state, providing a new characterization of DLR-states by means of the notion of detailed balance. This extends previous results, proved in one and two dimensions. 相似文献