First Principle Calculation for the Electronic Bands and Absorption of CdTe_（1-x）Sb_x

The lattice parameters for the derivatives of cadmium telluride, CdTe1-xSbx, with the zinc blend crystal structure are calculated using the generalized gradient approximation method; which is based on the density functional theory (DFT). The effects of antimony (Sb) on the lattices, electric bands, electronic state density, absorption spectroscopy, and band gap between the valence band maximum (VBM) and the conduction band minimum (CBM) of CdTe1-xSbx are discussed. The results show that the antimonic atoms in the lattice are advantageous in promoting the hole concentration and conductivities of CdTe1-xSbx. The increase of the Sb content in CdTe1-xSbx reduces the interaction among Cd, Te, and Sb; resulting in a decreased binding energy within CdTe1-xSbx as well as an increase in the electronic gap. Also discussed are the mechanics for the lattice phase change of CdTe1-xSbx at x=0.5.     

Position control for asymmetrical hydraulic cylinder system using a single on/off valve

A single on/off valve is used to carry out the position control of the asymmetrical hydraulic cylinder. The influence of the nominal flow rate on the positional accuracy of piston is investigated and the proximate formula for calculating the nominal flow rate of on/off valve is introduced. The system structure proposed in this paper could avoid cavitation and hyper pressure in two chambers to some extent. The simulation results indicated that the control method in this paper could satisfy the expected control requirements.     

模糊系统知识模型（Ⅱ）：范畴、知识及其近似与度量

讨论了建立在模糊系统知识模型之上的范畴与知识的概念,并通过引入粗糙集中上、下近似等基本且重要的概念,在知识模型中给出了标号集关于复合关系的上、下近似等定义,以及给出了知识模型中范畴与知识的近似及其度量方法.对于所给出的有关概念及度量方法通过举例给出了具体说明,为模糊系统知识模型一致性和完备性的讨论奠定基础.     

基于区间数规划的汽车乘员约束系统不确定优化

文中基于区间数规划法研究了汽车乘员约束系统的不确定优化问题.首先,利用MADYMO软件建立了乘员约束系统的仿真模型,并通过试验验证.接着确定以加权伤害准则为目标,安全带刚度、安全带上挂点位置和限力器的撕裂力与撕裂伸长等为设计变量,座椅和膝盖挡板的刚度为不确定量,并基于区间数规划法将不确定优化问题转化为确定性优化问题.通过拉丁超立方试验设计,建立目标函数和约束函数的近似模型,再利用序列二次规划算法和遗传算法分别作为内外层的求解器进行优化.最终,获得乘员约束系统参数的近似最优解.     

全新朗逸超越期待

2008年朗逸上市,4年来销量突破80万辆,成为A级车市的领军车型,如今全新朗逸的到来,将用全面升级的产品力回应消费者的信任,超越市场的期待。亲民的价格,硬朗大气的外观设计,堪与B级车比肩的前瞻配置,全方位的安全系统,为当代社会中流砥柱们提供了一款高性价比的全能高端中级轿车。     

奔驰SMART“精灵跑车”

以独特车身设计及饶富驾驭乐趣为诉求之Smart，自上市以来即话题不断，路上能见度日渐增加，代表着其个性化的设计，着实掳获不少年轻车主目光，Smart Roadster延续上世纪50及60年代即已销声匿迹的纯种小型敞篷跑车风潮，就如同原厂宣称一般，以紧凑且精采的方式去重新诠释道路之理念出发。     

本田太子"威猛"来袭--新大洲本田SDH125-42摩托车

在中国,越来越多的年轻人都希望能够拥有一辆属于自己的太子车,2003年,"威猛"(SDH125-42)的出现,使这一梦想触手可及。"威猛"是新大洲本田公司和本田技研共同开发的一款做工精良、品质优异、性价比极佳、外观美观的豪华CM款太子车,它拥有日本本田授权的全"HONDA"品牌。 VALKYRIE、VTX1300S、MAGANA 750、SHADOW 750、     

打造精品--大阳DY200摩托车

在广大用户持久的信赖与支持下,这几年洛阳北方易初摩托车有限公司集中了大批科技人员,不断推陈出新。最近他们又开发的大阳DY200两轮摩托车,融入了现代化的设计理念与技术,使其拥有更多与众不同的特点,堪称一款时尚的精品,相信该车一定会赢得更多车迷的青睐! 该车刚劲与大方的骨架奠定了其迷人的外形,再加上主色是浪漫而