N-策略休假GI-X／G／1排队系统队长的瞬时分布

本文应用Markov骨架过程理论研究了N-休假策略GI~X/G/1排队系统,并得到了队长的瞬时分布.     

KINETIC FLUX VECTOR SPLITTING FOR THE EULER EQUATIONS WITH GENERAL PRESSURE LAWS

This paper attempts to develop kinetic flux vector splitting(KFVS)for the Euler equa-tions with general pressure laws.It is well known that the gas distribution function forthe local equilibrium state plays an important role in the construction of the gas-kineticschemes.To recover the Euler equations with a general equation of state(EOS),a newlocal equilibrium distribution is introduced with two parameters of temperature approx-imation decided uniquely by macroscopic variables.Utilizing the well-known connectionthat the Euler equations of motion are the moments of the Boltzmann equation wheneverthe velocity distribution function is a local equilibrium state,a class of high resolutionMUSCL-type KFVS schemes are presented to approximate the Euler equations of gas dy-namics with a general EOS.The schemes are finally applied to several test problems for ageneral EOS.In comparison with the exact solutions,our schemes give correct location andmore accurate resolution of discontinuities.The extension of our idea to multidimensionalcase is natural.     

激光脉冲放大器的增益通量曲线研究

提出利用放大器的增益通量曲线来全面描述放大器增益特性的方法.并对单台放大器的增益 通量曲线进行了研究，从而进一步加深了对放大器的认识.为功率平衡研究提供有力工具. 关键词： 放大器 增益通量曲线 功率平衡     

以直代曲 精妙纷呈

以直代曲在微积分中是最基本、最朴素的思想方法,在新的课程准标中也被提到了相当的高度,因此,新教材中(如苏教版必修②及选修2-2)安排了丰富的例题和习题,旨在引导学生体会无限逼近、量变到质变与近似与精确的哲学原理,为教师和学生的活动提供了广阔的思维空间,以期促     

基于异步光取样的频率空间压缩法瞬时测频方法

瞬时测频技术是一项重要的电子技术。首次提出了一种基于异步光取样的频率空间压缩法瞬时测频方法。测量带宽可以从直流到40GHz,实验结果表明,响应曲线基本保持平坦响应,测频精度超过0.5MHz,可同时测量多个载波信号频率,在0.2μs或者更短时间内就可以完成一次测频。数值模拟表明,抗噪声性能可达-13dB以上,可以提取掩藏在100倍功率人为干扰中的有用信号频率。     

磁暴主相期间环电流分布特性模拟研究

磁暴主相期间对流电场驱动等离子体片中的能量粒子经历E×B漂移，被地磁场俘获形成环电流，在此理论基础上充分考虑电荷交换造成的环电流损失与离子沉降的影响，改善并验证了磁暴主相期间环电流离子分布模式.模拟了不同强度磁暴主相期间磁层环电流离子的分布特征，研究了部分环电流离子对对流电场的响应.结果表明：不对称的环电流是磁暴主相期间环电流的重要组成部分，其分布特性表现为晨昏不对称和日夜不对称以及离子投掷角分布的各向异性等.对流电场与能量离子通量强度和分布范围之间正相关.模拟结果与观测有很好的一致性，证明了模型的可行性 关键词： 部分(不对称)环电流 磁暴主相 离子通量分布 对流电场     

Radiative Energy Shifts of an Accelerated Multilevel Atom Coupled to the Derivative of a Scalar Field

We study the energy level shifts of an accelerated multilevel atom in dipole coupling to the derivative of a quantum massless scalar field and separately calculate the contributions of vacuum fluctuations and radiation reaction to the shifts. It is found that, in contrast to the case of a monopole-like interaction, both the vacuum fluctuations and radiation reaction contributions are changed by acceleration, and they all contain non-thermal correction terms. Our results suggest that the effect of acceleration on the energy shifts is dependent on the type of the interaction between the atom and the quantum field.     

Instantaneous coherent polarization and coherent polarimetric spectra

The statistics of polarization in electromagnetic waves or target vector has been studied deeply, generally using Stokes parameters. Unfortunately, all the data-processing includes the assumption that the sampling data are independent of time, without a consideration of the time coherence of the polarization data, such as instantaneous Stokes parameters. In this paper, the definitions of the instantaneous coherent polarization function and polarimetric spectrum are presented for the first time, which shows the coherences of the instantaneous Stokes parameters in both time and frequency domain, even in spatial coherence. The new formula of definition can be extended to spatial propagation coherence, both in free space or any linear medium.     

破产论研究综述

本文在保险数学（亦称为精算数学）的范畴内,对破产论近百年的研究进展作了综述性的回顾.首先,给出了Lundbeg-Cramér经典破产模型的确切表述、基本假定和主要结论,并以当代研究破产论的两种主要途径:Feller的更新论证和 Gerber的鞅方法给出了这一模型主要结论的严格证明.其次,重点阐述了当代研究破产论的权威学者 Gerber及其合作者的主要研究成果,并更为简明地介绍了当代破产论研究中其他的主要进展和理论研究热点.最后,以精算学术界泰斗HansBühlmann关于第三类精算师的评述作为全文的总结.     

INSTANTANEOUS SHRINKING AND LOCALIZATION OF FUNCTIONS IN Yλ （m,p,q,N） AND THEIR APPLICATIONS

61. IntroductionAs well knoWn, the solutionS of semilinear Parabolic equations at = An -- ac, 0 < q < 1have the ISS (the thetantaneous shrinking of the support) ~erty (see 11--5]).Such PrOPerty is d~d as follows.Defiallion 1.1. A hoction u E La(Q) is sold to haw the ISS p~rty, ijjor augr > 0, there hots a POsiboe n~ber R = R(T) such thatu(z, t) = 0for a. e. (z,t) e (R" \ Ba) x (T, co), tDhere AN is the N-dimensional Euclidean space,and Q = AN X (0, co).UP to the preseDt, there…