CCD传感器用于球面光学零件参数测量的新装置及方法

为了实现球面光学零件的数字化测量,介绍了一种用高性能CCD代替人眼,结合测量软件自动测量的新方法。可测量的参数包括正负透镜的焦距、球面曲率半径、中心偏等,具有精度高和重复性好的优点。数字化测量减轻了测量劳动强度,提高了工作效率。     

激光全息照相实验技巧(五)

总结了用于激光彩虹全息防伪标识光学加密的几种方法。     

由面积-周长关系测量的分形维数与材料韧性的关系

本文分析与研究了 Slit Island Method(SIM)测量断口磨面“小岛”周长-面积关系,指出由这种方法所测得的分形维数 Dm 不是金属断裂表面的真正分形维数 D_o,D_m 取决于测量“小岛”时的码尺长度并与 D_o 有定量关系。只有当测量码尺足够小时,D_m 才接近真正的分形维数 D_o。同时指出,许多作者所得到的 D_m 与韧性之间相反变化的原因是由于测量码尺太大造成的,当测量码尺的绝对长度小于临界长度,即“小岛”周长 Koch 曲线始图的边长时,D_m 与韧性之间才会呈现正变化的关系。     

Experimental investigation of maldistribution in vertical plate falling film tower

Falling film towers are popular in process industries due to moderate air side pressure drop, less energy ingesting liquid distribution and easy cleanup features. Two major limitations of falling film towers are the uneven distribution of liquid across solid surfaces (maldistribution) and contraction of falling liquid film on the solid surface (poor wetting). Maldistribution of liquid is primarily dependent on the type of liquid distributor and scope of liquid flow (slit opening) across solid surfaces. In the current communication; the influence of liquid distributor on maldistribution problem for vertical plate falling film tower has been experimentally investigated. Four types of liquid distributors: plain tube, spray nozzle, perforated plate, and branch tube distributor have been tested. Effect of parameters: slit opening, liquid flow rate, and the number of plates on maldistribution are also explored. It is found that branch tube distributor is best suited for vertical plate falling film tower application.     

ADS模式低存储电容像素设计

高级超维场转换技术(Advanced Super Dimension Switch,简称ADS)是以宽视角技术为代表的核心技术统称,其显示模式过大的存储电容(C_(st))成为限制Dual Gate GOA 4K TV应用的主要因素。在较短的充电时间内,像素为了维持相同的充电率,需要降低C_(st)。本文采用一种双条形电极ADS结构(Dual Slit ADS),其中像素电极与公共电极交叠区域形成ADS结构,像素电极与公共电极间隔区域形成共面转换(IPS)结构,通过减少像素电极与公共电极的交叠面积,起到降低ADS模式C_(st)的目的。模拟结果表明:当ADS显示模式采用Dual Slit ADS设计时,像素的C_(st)可以下降30%~40%。实验结果表明:采用Low Cst Pixel ADS设计时,VGH Margin可以增大2.5 V,但受到像素电极和公共电极的对位影响,透过率下降5%。     

Micro electro-discharge machining using water as a working fluid 2: Narrow slit fabrication

Micro-electro discharge machining (MEDM) using water as a working fluid, with its advantages of high removal rate and low electrode wear without formation of carbonaceous material, for deep micro-hole drilling with large ratios of depth to diameter is applied to the fabrication of narrow slits used for ultra-violet spectrometers. The optimum condition for narrow slit fabrication is investigated concerning the electric discharge circuit and combinations of electrode, workpiece materials and electrode polarity.

As a result, it is possible to fabricate fine slits as narrow as 20 μm wide and 3 mm long with fairly fine surface roughness of around 1 μm. Comparative estimation with an optical diffraction method shows that slits made by MEDM and commercially available ones made by photoetching are both of the same level in quality as determined from the higher order spots of the diffraction pattern. The MEDM method is superior to photoetching in fabricating finer and more accurate slits much faster.     

MNS煤泥管道输送系统设计研究

为解决煤泥浆的远距离输送和流化床锅炉长期稳定燃烧的问题，一种新型的MNS煤泥管道输送系统研制成功。主要介绍了煤泥管道输送系统的国内外现状，MNS煤泥管道输送系统组成、工艺流程原理以及关键技术设备等。该系统为长期困扰煤炭行业的煤泥综合利用和环境保护问题提供了一条有效的途径，在煤泥高效利用和环境保护方面创造了巨大的社会效益和经济效益。     

多线切分轧制对棒材连轧的影响

介绍了棒材多线切分轧制的原理和方法，并与常规的棒材连轧工艺和切分轮切分轧制工艺作了比较。同时，从物流衔接、工艺衔接、温度衔接等方面分析了多线切分轧制对棒材连铸连轧的影响；从设备选型、加热炉设计和生产规模等方面分析了多线切分轧制对连轧棒材车间设计的影响。     

带缝钢板剪力墙结构的性能分析

带缝钢板剪力墙作为一种新型的抗侧力构件,有着良好的综合效益.结合国内外部分相关的研究成果,如试件情况,试验结论和影响其性能的因素等,明确阐述了带缝钢板剪力墙结构的性能.     

狭缝规格对透气砖热机械应力的影响

为延长透气砖的使用寿命,对其热机械应力场进行了模拟分析,确定了狭缝的合理规格.首先根据透气砖工作特点及研究目的,在适当简化结构和边界条件的基础上,建立了二维平面应变有限元模型.然后在保持透气砖规格和狭缝分布形式一定的前提下,研究了狭缝尺寸和数量变化对透气砖热机械应力场的影响.研究结果表明,透气砖的高应力区集中于狭缝端部很小范围,应力变化较大的区域位于狭缝四周.缩短狭缝长度可降低透气砖的整体热机械应力;有限增大狭缝宽度可以降低狭缝端部热应力;增加狭缝数量可以降低其端部热应力,但会造成透气砖其他区域热应力的增大.