在量变中等待质变——CES2009国际消费电子产品展（下）

薄是为了…… 追求超薄电视并不是为了切菜，也不仅仅是感官愉悦．其本质是创造电视安装的更多可能，譬如镶嵌在家具板材中、挂在绳上、飘在杆上等等。JVC在竞争CES最薄称号失败之后，便更直白地喊出了最轻的口号——5kg！     

HDIUV雷射之实用制程

一、前言 在有机质封装载板与HDI电路板领域中，过去数年中UV雷射的用途已呈现显著的增加，其主要的推手应归功于小号（4mil之下）微盲孔（Microvias）用途的扩增。此外也还有其他用途的出现，例如：精密切外形与精准烧蚀绿漆成像之工程，也都带动了UV雷射的盛行。本文将举例某些系统机组之工作，     

EVA基无卤阻燃复合材料的研究进展

分别介绍了采用金属氢氧化物阻燃剂、蒙脱石型阻燃剂、磷系阻燃剂、氮系阻燃剂、膨胀型阻燃剂、有机硅阻燃剂、碱式硫酸镁晶须（MOS）阻燃剂和辐射交联技术制备的无卤阻燃乙烯―乙酸乙烯共聚物（EVA）复合材料的研究开发现状,并展望了无卤阻燃EVA复合材料的发展趋势。     

无卤阻燃光维护套料及光缆的研究

阐述了无卤阻燃光缆的阻燃理，护套和光缆的制备工艺，以及主要性能的测试结果。     

印制线路板用无卤型覆铜箔玻纤布环氧树脂层压板（JPCA—ES04—20071）

1适用范围 按照JPCA—ES-01（无卤型覆铜箔层压板试验方法）进行测定，氯（Cl）、溴（Br）含量分别小于0．09wt％且含量之和在0．15wt％（1500×10^-6）以下的定义为无卤型覆铜箔层压板。本标准适用于印制线路板用无卤型覆铜箔玻纤布环氧树脂层压板（以下简称覆铜板）。但多层印制线路板用的覆铜板除外。     

低烟无卤阻燃色条光缆的研制

本文主要介绍了低烟无卤阻燃色条光缆的研制，包括该产品的护套工艺流程、低烟无卤阻燃护套料的性能、对挤出机的要求、烘干工艺、温度控制、色母料配比、色条缆模具设计等。     

高端PCB板材打破国际垄断

在4月深圳全国电子展(65th CEF)的“印制电路板高科技材料新闻发布会”上，上海慧峰科贸宣布其研发的氰酸酯树脂已经通过科技鉴定，并被广东生益科技采用量产验证，打破了PCB产业高端材料CCL板被国外垄断的局面。     

板材冲压成形有限元数值模拟界面摩擦约束处理方法

基于弹塑性大变形板材冲压成形增量有限元法,采用线性弹簧单元提出一种空间三维板材冲压成形等效界面摩擦力的处理方法.这种方法的优点是可以反映界面摩擦力的同步、被动产生效果,同时它还可以保证约束后刚度矩阵的对称性.将提出的摩擦约束处理算法引入自主开发的板材成形模拟软件FASTAMP,计算了汽车油底壳的成形过程,计算结果的厚度分布与实际冲压件吻合比较好,验证了等效界面摩擦力约束处理方法的有效性.     

PARALLEL FINITE ELEMENT ANALYSIS OF HIGH FREQUENCY VIBRATIONS OF QUARTZ CRYSTAL RESONATORS ON LINUX CLUSTER

Quartz crystal resonators are typical piezoelectric acoustic wave devices for frequency control applications with mechanical vibration frequency at the radio-frequency （RF） range. Precise analyses of the vibration and deformation are generally required in the resonator design and improvement process. The considerations include the presence of electrodes, mountings, bias fields such as temperature, initial stresses, and acceleration. Naturally, the finite element method is the only effective tool for such a coupled problem with multi-physics nature. The main challenge is the extremely large size of resulted linear equations. For this reason, we have been employing the Mindlin plate equations to reduce the computational difficulty. In addition, we have to utilize the parallel computing techniques on Linux clusters, which are widely available for academic and industrial applications nowadays, to improve the computing efficiency. The general principle of our research is to use open source software components and public domain technology to reduce cost for developers and users on a Linux cluster. We start with a mesh generator specifically for quartz crystal resonators of rectangular and circular types, and the Mindlin plate equations are implemented for the finite element analysis. Computing techniques like parallel processing, sparse matrix handling, and the latest eigenvalue extraction package are integrated into the program. It is clear from our computation that the combination of these algorithms and methods on a cluster can meet the memory requirement and reduce computing time significantly.     

ELECTRICALLY FORCED THICKNESS-SHEAR VIBRATIONS OF QUARTZ PLATE WITH NONLINEAR COUPLING TO EXTENSION

We study electrically forced nonlinear thickness-shear vibrations of a quartz plate resonator with relatively large amplitude. It is shown that thickness-shear is nonlinearly coupled to extension due to the well-known Poynting effect in nonlinear elasticity. This coupling is relatively strong when the resonant frequency of the extensional mode is about twice the resonant frequency of the thickness-shear mode. This happens when the plate length/thickness ratio assumes certain values. With this nonlinear coupling, the thickness-shear motion is no longer sinusoidal. Coupling to extension also affects energy trapping which is related to device mounting. When damping is 0.01, nonlinear coupling causes a frequency shift of the order of 10^-6 which is not insignificant,and an amplitude change of the order of 10^-8. The effects are expected to be stronger under real damping of 10^-5 or larger. To avoid nonlinear coupling to extension, certain values of the aspect ratio of the plate should be avoided.