OSCILLATION THEOREM TO SYSTEMS OF IMPULSIVE NEUTRAL DELAY PARABOLIC PARTIAL DIFFERENTIAL EQUATIONS

In this paper,we study the oscillation of solutions to the systems of impul- sive neutral delay parabolic partial differential equations.Under two different boundary conditions,we obtain some sufficient conditions for oscillation of all solutions to the systems.     

First principles study on the structural, electronic and optical properties of diluted magnetic semiconductors Zn1-xCoxX （X=S, Se, Te）

The electronic and optical properties of zincblende ZnX（X=S, Se, Te） and ZnX：Co are studied from density functional theory （DFT） based first principles calculations. The local crystal structure changes around the Co atoms in the lattice are studied after Co atoms are doped. It is shown that the Co-doped materials have smaller lattice constant （about 0.6%-0.9%）. This is mainly due to the shortened Co-X bond length. The （partial） density of states （DOS） is calculated and differences between the pure and doped materials are studied. Results show that for the Co-doped materials, the valence bands are moving upward due to the existence of Co 3d electron states while the conductance bands are moving downward due to the reduced lattice constants. This results in the narrowed band gap of the doped materials. The complex dielectric indices and the absorption coefficients are calculated to examine the influences of the Co atoms on the optical properties. Results show that for the Co-doped materials, the absorption peaks in the high wavelength region are not as sharp and distinct as the undoped materials, and the absorption ranges are extended to even higher wavelength region.     

On an EOQ model for deteriorating items with time-varying demand and partial backlogging

For seasonal products, fashionable commodities and high-tech products with a short product life cycle, the willingness of a customer to wait for backlogging during a shortage period is diminishing with the length of waiting time. Recently, Chang and Dye developed an inventory model in which the backlogging rate declines as the waiting time increases. In this paper, we complement the shortcoming of their model by adding the non-constant purchase cost into the model. In addition, we show that the total cost is a convex function of the number of replenishments. We further simplify the search process by providing an intuitively good starting value, which reduces the computational complexity significantly. Finally, we characterize the influences of the demand patterns over the replenishment cycles and others.     

MIS二维报表自动生成工具的设计与实现

提出了一种用于管理信息系统(MIS)的二维报表方法,它根据抽象描述自动生成并具有全屏幕编辑功能,且阐述了软件自动生成工具的设计思路与实现方法。此软件工具面向ORA-CLE,DBASEⅢ,FOXBASE,FOXPRO。     

交变磁场下磁光薄膜动态法拉第效应特性的测量

论述了在交变磁场下测量磁光薄膜动态法拉第效应的原理和方法，利用此方法，在不同的调制磁场强度和频率下测量磁光薄膜的动态法拉第旋转特性，获得了较好的测量结果，并对测量误差进行了分析。     

Nonlinear Analysis of Relativistic Motion of Electrons in Self-Amplified Spontaneous Emission Free-Electron Laser in Ultraviolet and X-Ray Spectral Regions

The free-electron laser (FEL) based on the self-amplified spontaneous emission (SASE) is an effective candidate of the coherent optical sources at wavelengths in ultraviolet and x-rays. It requires a relativistic electron beam with extremely high quality and extremely stable transmission. In this paper we analyze the dynamic behavior of the relativistic electron in that device by calculating the entropy-like quantity. Results show that if there is no adiabatic field of the wiggler, the electron beam may have great fluctuation in velocity space and diverge in configuration space.     

炸药爆轰温度的瞬时多光谱测量

从多光谱测温的基本原理出发,对瞬时多光谱爆温测量装置的工作原理、系统结构、爆温计算以及测量过程中可能引入的误差和进一步提高测量精度的方法进行了阐述和分析.利用该装置对液体炸药硝基甲烷的爆温进行了实际测量,取得了满意的测量结果,其爆温为3672 K,扩展不确定度为100 K(k＝2),该温度下的光谱发射率为0.69.     

奇数阶超级幻方

在 [2 ]中已定义了超级幻方 ,本文将证明只要 n是个奇数 (n>1) ,n2 阶的超级幻方就存在。     

水对800℃下CH4在Ar气中分解制备单壁碳纳米管的影响

利用透射电子显微镜和拉曼光谱方法研究了水对800℃下Ar气中催化分解CH4制备单壁碳纳米管（SWCNTs）的影响.结果表明，反应气中少量水（室温下反应气的湿度约5%）的引入提高了产物中SWCNTs的含量.初步分析认为，水在反应过程中起到了提纯作用，从而降低无定形碳生成率.此外，还发现水的引入缩小了产物中SWCNTs的管径分布. 关键词： 单壁碳纳米管 水 拉曼光谱