流变时代的信息化挑战

流变时代的企业管理没有所谓“最佳管理”,响应流变环境的柔性与弹性就是其最为明显的管理特点,这种特点不仅直接影响到管理软件供应商的战略调整,也是企业管理信息化市场新一轮角逐与企业需求重心转移的焦点问题     

初三化学“绪言”教法的研究

我是一个走上教育岗位刚两年的化学教师。初三化学已教过两次,每次都有不同的体会。初三的同学是第一次上化学课,这一课上的好坏就直接关系到同学们以后学习化学的兴趣和态度。第一课是“绪言”,教时往往有困难。现在刚开学,又要教“绪言”了,我且把我的意见写出来供大家研究。     

沥青搅拌储罐加热节能技术分析与试验研究

分析了安装搅拌装置的沥青储罐动态加热原理和加热过程,初步建立了梯次动态加热模型,确定了多个沥青罐的加热时序和节点,并对沥青罐加热节能技术进行了试验研究.结果表明,在保证搅拌设备连续生产的条件下,沥青罐加热的时间节点为在用罐内沥青剩余34.5%时.与传统加热工艺比较,采用梯次动态加热工艺能减少热量损失19.23%,可有效降低加热能耗.该研究对提高沥青温度均化速度、减少能量消耗和改善沥青加热质量有重要的参考意义.     

超临界CO2固相接枝法制备马来酸酐改性聚丙烯的分级与表征

采用不同溶剂的连续萃取法,对超临界CO2固相接枝法制备的马来酸酐改性聚丙烯(PP-g-MAH)进行分级并获得了等规度不同的级份。对所得级份用傅立叶变换红外光谱仪(FT-IR)、差示扫描量热仪(DSC)和偏光显微镜(POM)表征,结果表明:接枝率不同的级份所对应的材料性能存在明显差异,接枝反应更易发生在非晶区或结晶不完善的区域,但接枝率越高的PP-g-MAH接枝越均匀。     

浅谈静压管桩的施工质量控制

静压管桩具有的单桩承载力高、施工方便、低噪音、穿透力强、造价便宜等特点,近几年来得到了迅猛发展及推广应用。同时由于锤击法施工在环保等方面（如施工噪音大）的缺点日益突出,故而静压法施工越来越普遍。由此而引发的许多关于静压管桩的质量问题也倍受人们的关注,本文就静压管桩施工质量控制作分析与探讨。     

球铰式引伸仪已成批生产

引伸仪是测量拉伸试件的伸长变形,用以确定材料的一些重要的力学性能的仪器.我们研制了一种新型的引伸仲仪—球铰式引伸仪.它     

Dielectrophoretic assembly of ZnO nanowires

The synthesis of zinc oxide （ZnO） nanowires is achieved by vapor phase transportation （VPT） method. The designed quartz tube, whose both ends are narrow and the middle is wider, is used to control the growth of ZnO nanowires. Dielectrophoresis （DEP） method is employed to align and manipulate ZnO nanowires which are ultrasonic dispersed and suspended in ethanol solution. Under the dielectrophoretic force, the nanowires are trapped on the pre-patterned electrodes, and further aligned along the electric field and bridge the electrode gap. The dependence of the alignment yield on the applied voltage and frequency is investigated.     

Analysis of Nanostructural Waveguides Using Fourth-Order Accurate Finite Difference Methods with Nonuniform Scheme

We successfully apply fourth-order accurate finite difference methods with nonuniform scheme to analysis the symmetric slot waveguides. The results of numerical simulations show that the present nonuniform formula offers the results more accurate than the previously presented second order schemes.     

Stimulated Emission from a TiO2 Particle-Dispersed Dye Polymer Plane Waveguide

We report the stimulated emission from a dye doped polymer plane waveguide with TiO2 particles. This waveguide consists of a poly （methylmethacrylate） （PMMA） film containing laser dye DCM as a gain medium. The emission spectrum of the film pumped by the Nd：YAG laser is different from the amplified spontaneous emission of the dye-doped film without particles. It is shown that when the excitation intensity reaches the threshold 9.6 μJ, the broad band emission spectrum narrows into multiple separate peaks with central wavelength of 608 nm. The linewidth of the sharp peak is 0.5 nm. According to our analyses, this phenomenon is due to the multiscattering of the disordered TiO2 particles inside the gain polymer film.     

一种通带平坦的粗波分复用/解复用器件的研制

随着粗波分复用(CWDM)系统在城域网和接入网中日益广泛的应用,人们对粗波分复用／解复用器的研究也逐渐展开。报道了一种8通道波长间隔为20nm的粗复用／解复用器。该器件基于阵列波导光栅(AWG)原理设计,利用平面光波导技术(PLC)制作,采用多模干涉输入结构和“S”形阵列波导结构,实现了较宽的通带宽度和较低的串扰。实验测得1dB带宽大于10nm,相邻串扰大于24dB,非相邻串扰大于32dB。介绍了其设计原理和制作过程,给出了光束传播法(BPM)数值模拟结果,并和实验结果进行了对比。