关于度量加的一个定理及一个矩阵不等式

关于度量加的一个定理及一个矩阵不等式苏化明（合肥工业大学数学力学系２３０００９）§１关于度量加的一个定理Ｒ。Ａｌｅｘａｎｄｅｒ在［１］中曾提出如下猜想：设两个单形的顶点分别为ｐ＿１，Ｐ＿２，…，Ｐ＿（ｎ＋１），和构作第三个单形，使得测应当有不等式这里...     

Singular Points Near an X_0-breaking Double Singular Fold Point in Z_2-symmetric Nonlinear Equations

ＳｉｎｇｕｌａｒＰｏｉｎｔｓＮｅａｒａｎＸ_０－ｂｒｅａｋｉｎｇＤｏｕｂｌｅＳｉｎｇｕｌａｒＦｏｌｄＰｏｉｎｔｉｎＺ_２－ｓｙｍｍｅｔｒｉｃＮｏｎｌｉｎｅａｒＥｑｕａｔｉｏｎｓＳｕＹｉ（苏毅）ａｎｄＷｕｗｅｉ（吴微）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅ...     

系统可靠性与最优检测周期的综合研究

本文研究可修系统的一个模型,假定系统可能因为各种原因造成失效率增大,并且这种情况需要检测之后才能发现,本文利用概率分析、补充变量和最优化方法,求出了系统的可靠性指标,并给出了计算最优检测周期的方法。     

大孔膦酸树脂吸附钇的研究

大孔膦酸树脂吸附钇的研究舒增年熊春华（丽水师范专科学校化学系浙江３２３０００）林峰（杭州大学化学系杭州３１００２８）关键词大孔膦酸树脂钇吸附机理中图分类号Ｏ６１４．３２２本文在ＨＡｃ－ＮａＡｃ体系中，研究了树脂吸附钇的性能及其机理，获得了诸多的结果，...     

局部域上的局部Hardy空间

文献［１］，［２］，［３］中讨论了Ｒ^ｎ上的局部Ｈａｒｄｙ空间，并利用乘子定理证明了ｈ_ｐ（Ｒ^ｎ）＝Ｆ_p.2⁰（Ｒ^ｎ）．本文利用Ｃｈｅｂｙｓｈｅｖ等式及正则函数的性质证明了在局部域上有类似的结果ｈ_ｐ（Ｒ^ｎ）＝Ｆ_p.2⁰（Ｒ^ｎ），从而建立起函数空间之间的关系，并由此给出一个乘子定理．     

1-(2,6-二溴-4-硝基苯)-3-(4-硝基苯)-三氮烯与锌的显色反应研究

研究了 1- (2 ,6-二溴 - 4 -硝基苯 ) - 3- (4 -硝基苯 ) -三氮烯 (DBNPNPT)与锌的显色反应。在表面活性剂Triton X- 10 0的存在下 ,p H=9.0— 11.0的 Na2 B4 O7- Na OH介质中 ,DBNPNPT与锌 ( )可生成橙黄色络合物。建立以 5 35 nm为参比波长 ,4 4 0 nm为测定波长的双峰双波长测定法 ,该络合物的表观摩尔吸光系数为 1.34× 10 5L· mol-1· cm-1。对葡萄糖酸锌中的锌直接测定 ,结果令人满意     

Axisymmetric three-dimensional finger solutions in Mullins-Sekerka equation

In this paper, we study the existence problem of axisymmetricthree-dimensional finger solutions of Mullins–Sekerkaequation. The finger solutions are travelling wave solutionswhose finger-shaped interfaces are moving along a certain directionat a constant speed within a cylindrical domain. The existenceof at least one axisymmetric three-dimensional finger solutionis obtained through a fixed-point argument of the Hilbert transformation.     

Ba2RV3O11(R=Y,Gd,La):Eu3+(或Dy3+,Bi3+)的合成及发光性能的研究

本文报导了Eu3+,Dy3+在Ba2RV3O11(R=Y,Gd,La)基质中的光谱性质、Bi3+对Dy3+发射强度的影响及温度对Dy3+发射强度的猝灭情况.研究了被取代离子R3+(R=Y,Gd,La)对基质电行迁移带、Eu3+的红橙比、Dy3+黄蓝比的影响,还给出了Dy3+的浓度猝灭值.     

The structure and distances in Yule recursive trees

Based on uniform recursive trees, we introduce random trees with the factor of time, which are named Yule recursive trees. The structure and the distance between the vertices in Yule recursive trees are investigated in this paper. For arbitrary time t > 0, we first give the probability that a Yule recursive tree Y_t is isomorphic to a given rooted tree γ; and then prove that the asymptotic distribution of ζ_t,m, the number of the branches of size m, is the Poisson distribution with parameter λ = 1/m. Finally, two types of distance between vertices in Yule recursive trees are studied, and some limit theorems for them are established.© 2007 Wiley Periodicals, Inc. Random Struct. Alg., 2007     

New instabilities of free-electron laser with an axial guide magnetic field

In this paper, the unperturbed orbits, their stable conditions and the single-pass gain of a free-electron laser have been treated with a single-particle theory to show the existence of a couple of new instabilities and moreover, to discuss their effects. Numerical analyses reveal that the new instabilities will probably affect the operation of free-electron laser when the guide field increases and get into the vicinity of its stability boundary.