Scheme for implementing quantum dense coding with four-particle decoherence-free states in an ion trap

This paper proposes an experimentally feasible scheme for implementing quantum dense coding of trapped-ion system in decoherence-free states. As the phase changes due to time evolution of components with different eigenenergies of quantum superposition are completely frozen, quantum dense coding based on this model would be perfect. The scheme is insensitive to heating of vibrational mode and Bell states can be exactly distinguished via detecting the ionic state.     

Closely packed dense frequency selective surface

In order to realize wideband filtering properties of frequency selective surface （FSS）, FSS of closely packed elements is presented. The Y loop elements are chosen as the graphics elements. Based on the spectral domain method, the frequency response is analyzed for different incident angles and polarizations. The result of the numerical analysis shows that the dense FSS has wide passband with better independence of angle and polarization.     

Analysis of visual perception of light emitting diode brightness in dense fog with various droplet sizes

Road signs must provide a conspicuous signal to a wide variety of drivers over a broad range of environmental and geometric conditions. Recently, there are an increasing number of applications in which light emitting diodes (LEDs) are used as the light source, including critical transportation signaling. In the presence of fog, the resulting visual signal is disturbed due to light scattering by airborne water droplets. By measuring LED brightness with human spectral sensitivity in various densities and various droplet sizes (10, 30, 50, and 100 μm), it is understood that the particle size distribution (fog droplet size) and density of fog does affect visibility in fog. The colored LEDs that contain a yellow component had high brightness evaluation, blue component had low brightness evaluation in all densities and different droplet sizes. The result in this paper can contribute to air and land traffic safety and the prevention of accidents.     

可用于累煤层露天矿山的多周期目标规划模型

本文给出了一个可应用于复合煤层露天矿短期生产计划优化的目标规划模型.模型考虑了与煤质、煤产量及开采程序合理性有关的亏损与盈利.该方法利用了带有客观地确定权重系数的目标规划加权法.文后又给出了一个能说明该模型应用于实际采矿问题的例子.     

Job Shop单机多目标调度

研究了Ｊｏｂ Ｓｈｏｐ生产系统的单机调度问题，提出并建立了单机总的流通时间，延误工作数量、最大延误时间、总的延误时间、总的提前时间、总的准备时间、优衔关系等多目标通式模型，应用模拟退火方法进行了仿真实验。     

稠密、自反E－半群的局部化和最大幂等分离同余

定义了稠密、自反Ｅ－半群Ｓ，证明了Ｓ＇在其幂等元带上的局部化存在且唯一，当Ｅ（Ｓ）是左零带时，给出了Ｓ的最大幂等分离同余．     

单片机观众席调光台的设计

本文介绍观众席调光台的硬件结构和软件设计，并阐述电脑调光台实现可控硅数字触发的一种方法，提出了采用时间表解决数字触发实时性的问题。     

谈软件开发项目的进度控制

分析了影响软件开发项目进度的因素,提出了提高软件开发项目进度控制的措施以及项目进度控制中应注意的问题。     

一类对称Duffing方程的次调和解

证明了具有偶或奇对称性Duffing方程x″ g(x)=p(t,x)(=p(t 2π,x))在满足条件li mh∞∫2cc -((hh))h-dsG(s)=0 p(g(t,x)x)→→0 x ∞li m|x|∞sgn(x)g(x)= ∞时,存在无穷多个对称的次调和解,并且其次调和解具有某种稠密性分布.