Sol-gel preparation of transparent zinc oxide films with highly preferential crystal orientation

ZnO films highly orientated along the (0 0 2) plane were obtained by preheating the films at different temperatures for 10 min after each coating and postheating at 600 °C for 1 h. The pre-heat treatment conditions were found to strongly affect the crystallographic orientation, morphology and the optical properties of the resultant ZnO films. The more the films were oriented preferentially along (0 0 2) direction, the greater became their optical properties. By applying the preheating temperature of 300 °C, the grain size of films was increased and the average optical transmittance became about 80% in the visible range. The films showed smooth surface with a fine microstructure without cracks and voids.     

Statistical Inference about the Shape Parameter of the New Two‐parameter Bathtub‐shaped Lifetime Distribution

This paper proposes a simple and exact method for conducting a statistical test about the shape parameter of the new two‐parameter lifetime distribution with a bathtub‐shaped or increasing failure rate function, as well as an exact confidence interval for the same parameter. The necessary critical values of the test are given. The method provided in this paper can be used for type II right censored data. Moreover, Monte Carlo simulation and an example are used to compare this new method to the existing approach of Chen (Statistics and Probability Letters 2000; 49:155–161). Copyright © 2004 John Wiley & Sons, Ltd.     

磁场对粘胶纤维纺丝原液性能的影响

初步研究了钕铁硼磁性材料在粘胶纤维生产中的应用,结果表明在钕铁硼磁性材料磁场的作用下,粘胶原液的纺丝性能的某些指标发生了改变,磁场对纺丝原液的粘度,熟成度、过滤值以及酯化度都有影响。这一结果为选择合适的磁参数应用于实际的具体生产实践具有指导作用,同时为稀土永磁材料在化学纤维的生产中的应用进行了新的尝试。     

新型数控技术在鼓风机调速与保护系统中的应用

对邯钢1260m^3高炉风机机组原系统存在的问题进行了全面分析，采用新型数控技术进行改造，给出了详尽的改造方案，通过对其实际使用效果的说明，展示了其多处技术创新点和广阔的市场推广前景。     

Rapid fabrication and optical properties of zinc sulfide nanocrystallines in a heterogeneous system

ZnS nanoparticles about 3 nm in size were prepared by a simple, rapid and reliable route under microwave irradiation in a heterogeneous system, using ZnAc₂·2H₂O (AcCH₃COO) and Na₂S·9H₂O as the starting materials, ethylene glycol (EG) as the medium. The product was characterized with X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and ED, respectively. The optical properties of ZnS nanoparticles were studied.     

2003年云南金属材料与加工年评

评述了云南省在黑色金属、有色金属、稀贵金属和陶瓷材料等方面所取得的研究成果。     

物流GPS监控管理系统的设计和应用

物流GPS监控管理系统是一个基于GPS车载设备/监控中心/互联网的移动目标跟踪服务平台,以地理信息系统(GIS)为基础,借助互联网进行信息汇总,集监控、定位、报警及调度于一体的信息管理系统,它的应用能有效地提升物流企业的现代化管理水平。本文针对江铜集团永信运输有限公司物流GPS监控管理系统的特点、设计开发和应用作了详细的介绍。     

Correlations between the Optical Properties and the Microstructure of TiO_2 Thin Films Prepared by Reactive Electron-beam Evaporation

1　IntroductionInrecentyears ,theoreticalandexperimentalinvesti gationsonthetitaniumoxidefilmsareconductedonac countoftheirremarkableproperties .Titaniumdioxidefilmshaveattractedconsiderableattentiontoapplytomi croelectronicdevices ,opticalthin filmdevice…     

顾客让渡价值与企业价值双赢的模式和方法

通过对顾客让渡价值的概念和内涵的阐述，对企业提升顾客让渡价值的重要意义的分析，指出了多方位提升顾客让渡价值，也可以使企业价值达到最大化．建立了顾客让渡价值与企业价值双赢的模式，最后根据价值工程学提出了建立价值双赢互动机制的方式方法．