从对称矩阵代数到全矩阵代数的线性群逆保持

设F是一个特征不为2的域,Mn(F)和Sn(F)分别记F上的n×n全矩阵代数和对称矩阵代数.所有的从Sn(F)到Mn(F)的保群逆的线性映射被刻划,作为一个中间步骤,三个矩阵的同时相似标准形也被证明.这个标准形简化了从Sn(F)到Mn(F)的保群逆的线性映射的刻划.     

D→Kl■_l衰变过程的研究

用光锥QCD求和规则研究D→Kl■_l衰变过程,首先计算D→K跃迁形状因子,通过构造新的关联函数,消除了twist_3波函数的不确定性给计算结果所带来的影响,从而使计算结果更加精确.计算得到的分支比与最近的实验数据相一致.     

GEOMETRIC INEQUALITIES FOR CERTAIN SUBMANIFOLDS IN A PINCHED RIEMANNIAN MANIFOLD

This article gives some geometric inequalities for a submanifold with parallel second fundamental form in a pinched Riemannian manifold and the distribution for the square norm of its second fundamental form.     

REMARKS ON THE EXISTENCE OF WEAK SOLUTIONS TO 2-D INCOMPRESSIBLE NAVIER-STOKES EQUATIONS

1.IntroductionConsiderthefollowinghomogeneous2-DincompressibleNavier-Stokesequations:whereV=(VI(t,x),VZ(t,x))isthevelocityofthefluid,Pisthescalarpressure,V'V=V101 V202,andtheconstantu>0isthekineticviscosityofthefluid(whenu=0,thissystemiscalledEulerequations,andwedenoteitby(1.1)).Byactingtheoperationofcurlon(1.1),wecanobtaintheevolutionequationforvorticityw=(a1VZ--02VI).Itisthevorticity-streamformof(1.1)(whenu=0,wedenoteitby(1.2)).For(1.1),in[4],R.DipernaandA.Majdaprovedtheglobalexiste…     

On <Emphasis Type="Italic">τ</Emphasis>-adic representations of integers

Elliptic curve cryptosystems (ECCs) have become increasingly popular due to their efficiency and the small size of the keys they use. Particularly, the anomalous curves introduced by Koblitz allow a complex representation of the keys, denoted τNAF, that make the computations over these curves more efficient. In this article, we propose an efficient method for randomizing a τNAF to produce different equivalent representations of the same key to the same complex base τ. We prove that the average Hamming density of the resulting representations is 0.5. We identify the pattern of the τNAFs yielding the maximum number of representations and the formula governing this number. We also present deterministic methods to compute the average and the exact number of possible representations of a τNAF.      

Static and dynamic properties of heavy light mesons in infinite mass limit

We summarize the consequences of the infinite limit of heavy quark mass in the results of form factors, charge radii and decay constants of heavy light mesons within a QCD inspired quark model recently reported.     

四元数矢丛的辛Pontryagin示性式和它的积分公式

设ρ（Ｍ）是微分流形Ｍ上的左四元数矢丛，文中给出ρ（Ｍ）的辛Ｐｏｎｔｒｙａｇｉｎ示性类和辛Ｐｏｎｔｒｙａｇｉｎ示性式的定义，并给出说明它们之间的联系的积分公式。     

Incoherent scattering of 59.5 keV gamma-rays by light,medium and heavy elements

Summary Total atomic incoherent-scattering differential cross-sections were determined experimentally for 59.5 keV gamma-rays in Ti, Ni, Zn, Se, Mo, Ru, Cd, Sn, Te, Yt, W and Pb at 120° scattering angle using Ge(Li) detector. The background correction and detection efficiency are also included in the study. The experimental values have been compared with those estimated on the basis of the non-relativistic Hartree-Fock wave functions. Good agreement is observed between theory and experiment.     

B~n的（0，1）型热核形式及应用

本文构造了Ｃ￣ｎ中单位球Ｂ￣ｎ和多圆盘△￣ｎ的（０，１）型热核形式，作为应用，我们给出了多圆盘上方程解的积分表示．     

Analysis of discrete time queues via the reversed process

A class of discrete-timeM/G/1 queues, including both round robin and last come first served service, in which customers are subject to permutations is considered. These time slotted queues, analogous to the symmetric queues of Kelly, are analyzed by examination of the time reversed process. Product form stationary distributions are found for a type of doubly stochastic server of Schassberger [5] and for a Bernoulli arrival process queue model of Henderson and Taylor [2].