The Analysis and Improving of the Microwave Exciter in the Lower Hybrid Wave System

When we carry out lower hybrid wave heating and current driving plasma experiment at tokamak, we need mega-watt order of microwave power. The microwave signal at frequency of 2450 MHz is generated by a microwave exciter. According to the experiment＇s demands, the microwave exciter must provide output power of 1.5～ 2. 5 W with stabilized frequency and amplitude tobe used as the klystron input. Being amplified by the klystron, the microwave signal is transmitted through the transmitting system to the antenna and is emitted into the HL-2A tokamak. So we can see that the microwave exciter＇s function is very important to the lower hybrid wave heating and current driving plasma experiment.     

Deposition of Hydrogen-Free Silicon Nitride Thin Films by Microwave ECR plasma Enhanced Magnetron Sputtering at Room Temperature

Hydrogen-free silicon nitride （SiNx） films were deposited at room temperature by microwave electron cyclotron resonance （MW-ECR） plasma enhanced unbalance magnetron sputtering system. Both Fourier-transform infrared spectroscopy and x-ray photoelectron spectroscopy are used to study the bonding type and the change of bonding structures of the silicon nitride films. The results indicate that the chemical structure and composition of SiNx films deposited by this technique depend strongly on the N2 flow rates, the stoichiometric SiNx film, which has the highest hardness of 22.9 GPa, could be obtained at lower N2 flow rate of 4 sccm.     

A Compact Magnetically Insulated Line Oscillator with New-Type Beam Dump

We present a compact improved model of the magnetically insulated line oscillator with new-type beam dump and other novel features. In the experiments, high-power microwave of the TM01 mode is generated from the device with a frequency range of 1.73-1.78 GHz and a peak power level of above 2 GW, when the diode voltage is taken in the range 520-540kV, and the diode current is in the range 58-62kA. This confirms the simulation results.     

中国电子行业的元器件积压现状与解决方案

市场形势瞬息万变，供应链管理对于电子企业降低运营成本．减少经营风险非常重要。特别是在目前我国企业管理手段相对落后．电子元器件库存和积压问题日益突出的情况下，加强电子供应链与物料信息管理，对于保证电子信息产业的稳定．安全和可持续发展，具有非常重要的现实意义。[编按]     

A Generalization of the Mean Size Formula of Wavelet Packets in Lp

The purpose of this paper is to investigate the mean size formula of wavelet packets in Lp for 0 〈 p ≤ ∞. We generalize a mean size formula of wavelet packets given in terms of the p-norm joint spectral radius and we also give some asymptotic formulas for the Lp-norm or quasi-norm on the subdivision trees. All results will be given in the general setting,     

技术释疑——为您解决SMT生产技术困惑

问题1：请问你们工厂的PCBA在过锡炉后是否有很高的不良率。我们工厂最近几个月过锡后的不良率极高，严重影响了我们的制程合格率，主要问题有：     

新型电子信息功能陶瓷材料的发展趋势——电子元器件小型化、高频化、集成化的希望之星

3C融合对功能陶瓷提出挑战 集计算机机（Computer）、通信（Communication）、消费类（Consumption）电子于一体的数字3C产品近年来得到了快速发展，3C融合产品已成为今后重要的发展方向，据预测，3C融合将创造出一个高达4000亿美元的产业，3C产业的高速发展，极大地推动着电子基础产品和元器件的同步协调发展，同时，电对电子元器件的基础材料——信息功能陶瓷提出了严峻的挑战，当然，也提供了良好的发展机遇。     

IDT推出预处理交换芯片增强无线基础设施效能

Silicon Laboratories日前针对以太网络用电装置（Powered Device，PD）应用推出业界最高集成度的IEEE802．3af以太网络供电（Powerover Ethernet，PoE）控制器。Si3400是唯一内置二极管桥式电路（diode bridge）、瞬时突波抑制电路和开关稳压器FET晶体管的PD控制器。Si3400控制器的高集成度大幅减少元器件用料和电路板面积，     

电力管理产品的领导厂商共同签署太阳能的备忘录

专业电子元器件代理商益登科技宣布，与Silicon Laboratories携手合作，于11月28日在西安举办“C8051F系列单片机技术研讨会”，向用户呈现这些产品独特的功能。     

深耕中国——解读分销巨头安富利

作为电子元器件分销行业的强手之一,安富利始终深耕中国市场,我们看到,近年来安富利的运作经验,本土化程度及并购力度都非常值得称道。目前,该公司在中国拥有超过500名员工,设有22个办事处及4个物流中心,并在上海及深圳设有设计中心,与20多家独立设计公司合作开发适应市场需求的设计项目,包括网络解决方案、消费电子、音频、视频及数字图像产品,提供一站式设计服务。EDN China此次特别采访了安富利高级副总裁Ed Kamins和安富利电子元件部亚太区营运副总裁林忠明,为大家带来电子分销巨头的观点。