Upwind finite volume element methods for one-dimensional semiconductor device

A fully discrete implicit Euler upwind finite volume element method is derived and studied for one-dimensional semiconductor device. Upwind scheme is introduced to deal with the convection-dominated diffusion equations in the semiconductor model. With different time steps for the electrostatic potential and the other unknown quantities, the computational procedure of the method is obtained. The local mass conservation laws are preserved under the framework of the upwind finite volume element schemes. A first-order accuracy in the L ²-norm is proved. Numerical experiments are given to validate the usefulness and efficiency of the method.     

Discusses the Highway Construction Project Cost Effective Way to Control

成本控制在公路工程施工中非常重要,成本控制得好,对于整个工程项目来说也是质量的一个确保.文章从几个方面论述了成本控制的有效途径.     

Sufficient Reason and Reason Enough

I offer an analysis of the Principle of Sufficient Reason and its relevancy for the scientific endeavour. I submit that the world is not, and cannot be, rational—only some brained beings are. The Principle of Sufficient Reason is not a necessary truth nor a physical law. It is just a guiding metanomological hypothesis justified a posteriori by its success in helping us to unveil the mechanisms that operate in Nature.     

Semi-global stabilization via homogeneous output feedback for a class of nonlinear time-delay systems

The semi-global stabilization problem for a class of nonlinear systems with state time-delay is addressed in this paper. By using Lyapunov-Krasovskii functional method and homogeneous domination approach, a homogeneous observer and an output feedback controller with a scaling gain are designed. Then the scaling gain is adjusted such that the closed-loop system is semi-global asymptotically stable. A numerical example is presented to illustrate the effectiveness of the obtained results in this paper.     

初级任职教育更需具有引领性

我军初级任职教育在具有针对性和实效性的同时，更应当具有引领性，要充分发挥院校是新理论、新科技、新知识、新战法的重要策源地和创新源的作用，不能仅限于跟着部队走，做部队训练的“影子”。要搞好学科专业建设，整合优化教学内容、课程设置，提高教员队伍水平，从而以先进的理论和方法，引领部队建设和军事训练。     

电力系统服务器实时保护系统的研究与实现

指出了目前电力信息系统存在的各种问题,提出了一种基于存储型的数据一体化保护方案,分析了基于存储型的数据一体化保护技术和相应的体系架构,并实现了该系统.系统测试结果表明了该系统的可行性和可靠性.     

Attentional negativity bias moderated by positive mood arousal

Automatically allocation of more attention to negative stimuli is called emotional negativity bias. An event-related potentials (ERPs) experiment investigated whether or not this bias was altered by positive mood arousal. The results suggested that the attention bias towards negative stimuli was attenuated when positive information was accessible.     

甲状腺冰对蜡块与冰剩蜡块免疫组织化学染色效果比较

目的通过对甲状腺冰对蜡块与冰剩蜡块免疫组织化学染色效果进行对照观察．发现冰对蜡块与冰剩蜡块对免疫组织化学染包效果的差异，为选择冰对蜡块与冰剩蜡块做免疫组织化学提供理论实践依据。方法3冰对蜡块与冰剩蜡块分别切片用EnVision法做TTF-1，CK19，Gal—3，HBME—1．TPO,TG免疫组织化学染色。结果对TTF—1．CK19．Gal-3，HBME-1，TPO，TG免疫组织化学染色结果的背景．定位进行分析．冰对蜡块与冰剩蜡块免疫组织化学染色各项指标阳性率完全一致。结论冰对蜡块与冰剩蜡块分别做免疫组织化学染色结果无明显差别．在没有冰剩蜡块或冰剩蜡块不符合要求时选择冰对蜡块做免坡组化．结果对诊断无影响。     

Hydrochemical Characteristics and the Suitability of Groundwater in the Coastal Region of Tangshan,China

Through collecting groundwater samples from the coastal region of Tangshan, China, the hydrochemical processes that affect the chemical composition of groundwater and the quality of resources were anal...     

Teeming stream protection using an argon shroud during casting of steel ingots

Two kinds of argon shroud protection devices with two different basic structures were designed and investigated. Industrial experiments and numerical simulations were used to examine the protection effect, and the mechanism of air entrapment during the casting of steel ingots was analyzed. The influence of the structure of the argon shroud protection device on the protection effect was investigated. An argon shroud protection device mounted to the nozzle holder on the bottom of the ladle does not provide a good protection effect because air can easily flow into the teeming system and cause reoxidation of molten steel during teeming. By contrast, an argon shroud protection device seated on the top of the central trumpet provides an excellent protection effect, where air has little chance of flowing into the teeming system during casting. The feasibilities of the argon shroud protection devices are discussed.