Transparent Polycrystalline ZnS and ZnSe Growth by CVT Method

ZnS and ZnSe are important infrared windows materials, which are grown by CVD method traditionally. Comparing with CVD method, the device of CVT (chemical vapor transport) method is much simpler. Transparent polycrystalline ZnS and ZnSe were grown by CVT method successfully. The grown ZnS and ZnSe shows that their transparencies exceed 40% in infrared region. After HIP treatment, the transmittance of as-grown CVT ZnS is improved greatly, which is better than 60%. The defects which effect transparency were studied.     

汽车金属带式无级变速传动技术

 无级变速器是汽车传动技术的重要发展领域之一．介绍了金属带式无级变速传动技术的发展概况，阐述了
金属带式无级变速器的基本结构、传动原理，比较分析了其性能、可靠性、寿命与成本等一些技术特性．对金属带式
无级变速传动中的电液控制技术进行了分析，指出具有电液控制技术的无级变速综合控制系统才能满足现代汽车
发展的要求．     

单收发器分布式多跳认知媒体接入控制协议优化设计

针对移动自组网（MANET）媒体接入控制（MAC）协议中存在的多收发器限制、信道负载失衡等问题,并兼顾多跳和控制开销等性能,提出一种单收发器多跳分布式认知MAC协议优化模型。首先基于功率节省模式（PSM）机制,利用通知传输指示消息（ATIM）窗口和DATA窗口时间分割实现认知MAC协议的信道感知和数据传输功能;其次对功率值非均匀量化和格雷编码,降低移动性导致的浮点型开销;然后设计了多跳分布式信道协作机制,以此为基础,重定义信道切换规则,确保信道之间负载均衡;最后对信道空出时间（CVT）、信道开启时间（COT）、吞吐量和信道负载时间进行仿真。结果表明,新协议无需多收发器支撑,各信道之间CVT、COT、负载时间差值分别降低了13 ms、20 ms和100 s,对应吞吐量提高了1.5%,实现了协议在收发器数、信道负载均衡、吞吐量和控制开销等性能方面的优化。     

基于CVT的混合动力汽车建模与仿真

建立了基于无级变速器 (Continously Variable Transmission,CVT) 的前向并联式混合动力电动汽车动力系统模型,为了研究整车动力性、经济性,根据行驶动力学方程,采用极值原理和曲面拟合法对发动机台架试验得到的数据进行了多项式拟合,建立了发动机万有特性与最佳操作曲线(Optimal Operating Line,OOL) 模型,并建立了牵引用三相感应电机动力模型以及牵引蓄电池(State of Charge,SOC)模型.同时,提出了燃油消耗最低、蓄电池充放电平衡的能量分配控制策略,进行整车动力性仿真计算,仿真结果表明在保证循环结束电池充放电基本平衡的同时发动机燃油消耗最低,仿真试验对比结果验证了建立的模型的精确性.     

脉动式无级变速器的现状和发展动向综述

脉动式无级变速器以其结构简单、传动可靠等优点而得到广泛应用。文章详细的综述了目前国内外脉动式无级变速器的发展现状及趋势。根据脉动发生机构的性能要求、结构特点和过去机构存在的不足,据此提出了采用凸轮连杆组合机构作为脉动发生机构。对对心式样机进行了性能测试和分析样机存在不足并提出改进。实验数据验证了设想可行性,效果明显优于过去产品。     

金属推快V—带型CVT的研究部分4：速比变化时金属块上的作用力

６个力作用于金属推块Ｖ－带的推块上,前文我们采用测量推块和遥测装置成功地测出了稳态下这６个作用力。本文采用相同的试验和测量装置测出速比变化从低到高或相反的不稳定状态下的６个作用力。实验结果表示除法向力和环与推块间的摩擦力外其余４个力的分布形式是稳态不同的。     

VT1--一种适用于中国的无级变速器

本文介绍了ZFST的VT1型无级变速器及与常规自动变速器相比所具有的优点.并介绍了电控型VT1和进一步开发的过程.     

金属带式无级变速器的力学分析

论述了金属带式无级变速器的力学分析模型，建立了金属环、金属块的力学分析模型。运用相关工具就金属环张力和金属块挤推力进行计算分析，得出了重要的结果，可直接用于金属带CVT的设计分析。     

Optimal engine operation by shift speed control of a CVT

In this paper, an algorithm to increase the shift speed is suggested by increasing the line pressure for a metal belt CVT. In order to control the shift speed, an algorithm to calculate the target shift speed is presented from the modified CVT shift dynamics. In applying the shift speed control algorithm, a criterion is proposed to prevent the excessive hydraulic loss due to the increased line pressure. Simulations are performed based on the dynamic models of the hydraulic control valves, powertrain and the vehicle. It is found from the simulation results that performance of the engine operation can be improved by the faster shift speed, which results in the improved fuel economy by 2% compared with that of the conventional electronic control CVT in spite of the increased hydraulic loss due to the increased line pressure.     

Characteristics of island growth of Hg1−xCdx Te on (100) CdTe substrates by chemical vapor transport

The characteristics of island growth of Hg_1−xCd_xTe (MCT) by chemical vapor transport on (100) CdTe substrates have been studied, for the first time, by optical microscopy, by infrared transmission spectroscopy, and by chemical etching. Nonuniformities of the growth thickness, of the growth rate, and of the composition of islands are observed. Based on the experimental results, the origin and the inhibition of island growth of MCT on (100) CdTe substrates are discussed.