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。     

玻璃钢导流罩插入损失仿真研究

玻璃钢材料的声学特性与海水匹配良好,同时玻璃钢材料具有较低的传播损失,因而广泛应用于水声设备导流罩的制作。对于部分水声设备,导流罩带来的能量损失仍不可忽略。基于此,应用有限元软件建立玻璃钢导流罩模型,对玻璃钢导流罩的声压透射系数和插入损失进行计算,并与实测结果进行对比,明确玻璃钢导流罩的插入损失,为后续导流罩的改进设计与性能提升提供参考。     

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。     

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。     

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。     

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.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.