利用红外热像仪检测玻璃钢内部缺陷

实验表明，红外热成像技术可以有效地检查玻璃钢内部脱胶。对玻璃钢内部缺陷的检测来说，本方法优于其它常规方法。     

解密车载玻璃钢天线

近年来业余无线电市场上上悄然出现一类车载型玻璃钢天线,其外形与基地玻璃钢类似,只是直径要细一些,同时重量也轻一些。很多销售商家都向HAM推销这种天线,并称这种天线采用特殊结构,效果比传统钢线制成的车载天线要好,就像固定架设的玻璃钢"棒子"天线一样。那么,事实是否如此呢?车载玻璃钢天线与以钢线为主体的传统车载天线孰优孰劣,下文中笔者将为大家一窥究竟。车载型玻璃钢天线在网上几乎找不到任何制作资料和内部结构图,为了探究车载玻璃钢天线的内部真实结构,笔者在市场购买了一付有一定知名度品牌的高增益玻璃钢车载天线进行测试和解剖。     

漫谈天线性能测试

以常见的玻璃钢垂直天线为例,其内部电气结构与天线的射频性能密切相关,每一单元振子的尺寸决定了天线的工作频率,阵列单元数量决定了天线的增益,阵列结构与实现方法决定了带宽,整体结构形式决定了天线波瓣特性,部件的耐压水平和连接固定工艺决定了天线的最大承受功率。     

基于红外脉冲相位热成像技术的玻璃钢深度测量

为探索红外热成像技术用于玻璃钢材料厚度测量的方法,文中使用闪光灯脉冲激励热成像的方法对玻璃钢平底洞标准件进行检测,通过脉冲相位法(PPT)进行数据处理,提取频域信息、消除噪声,并在试验设备采样频率不能满足盲频测量要求的限制条件下,建立相位阈值,完成了厚度测量。试验结果表明,玻璃钢试件的物理特性会对测量结果造成误差,但经数值优化后可在一定厚度范围内得到和实际深度接近的探测值,该方法可以作为玻璃钢厚度测量的有效手段。     

树脂含量对裱糊玻璃钢的影响

通过对手工裱糊成型工艺中玻璃钢树脂含量的实验，研究玻璃钢树脂含量对裱糊成型工艺中出现的玻璃钢制品发白现象的影响，确定了裱糊工艺的树脂用量，对玻璃钢手工裱糊工艺有一定指导作用。     

变频器在玻璃钢化设备中的应用

本文主要讲述了玻璃钢化的主要原理及变频调速技术在玻璃钢化设备中的应用。     

玻璃钢内衬式人井施工技术

玻璃钢内衬式人井,其玻璃钢内衬具有防污水腐蚀、抗冲刷和寿命长的特点,主要运用于城市给排水设施中的排污管道。本文主要介绍国外城市管网工程中的玻璃钢内衬式人井的施工技术,以供同行参考。     

五米通信天线面板玻璃钢铆胎的设计和制造

采用玻璃钢成型工艺技术制造天线面板铆胎有许多优点，它不仅缩短制造周期而且降低了生产成本。本文从设计和制造两个方面总结了五米通信天线面板玻璃钢铆胎研制过程，研制出的玻璃钢铆胎型面精度为0.2mm(r.m.s.)，达到了设计要求。     

脉冲红外热波检测技术的影响因素分析

利用ANSYS有限元仿真与试验研究了脉冲红外热波检测技术的影响因素。以玻璃钢、碳纤维及热障涂层三种材料为例进行了仿真,重点研究了环境、被测材料自身缺陷等因素对脉冲红外热波检测的影响,并对玻璃钢和碳纤维两种材料的检测能力进行了判定。对碳纤维和玻璃钢材料进行了试验,研究了实验条件对检测效果的影响,并给出了玻璃钢和碳纤维两种材料的最佳实验参数。     

聚脂树脂玻璃钢在卫星电视接收天线中的应用

本文介绍了聚脂树脂玻璃钢天线的结构设计、性能、制造工艺，以及在卫星电视接收天线中的应用情况，供大家广开思路，拓展聚脂树脂玻璃钢的应用领域。     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.