微三维结构型腔的微细电火花加工

利用简单截面形状电极,建立在在分层制造思想上的电极等损耗微细电火花加工技术是实现微三维结构微细加工的有效手段。分析了该方法的工艺特点;研究了实现该技术的条件及电极损耗补偿策略。     

电火花加工中电极损耗自动测量及自动补偿

介绍了对电火花成形加工中产生的电极损耗进行自动测量及自动补偿的方法。运用这一方法能提高产品尺寸、形状精度。同时实现了自动连续无人化的加工，尤其适用于单电极多型腔的加工，保证各个型腔尺寸一致。     

LIGA和微细EDM技术制造不锈钢微结构的研究

通过LIGA技术与微细电火花技术相结合，可以在硬质合金、不锈钢等材料上加工出微结构，这一新的方法必将拓宽微细加工的能力和应用范围。利用LIGA技术制备线宽70μm、厚度达730μm的铜工具电极，采用微细电火花技术在不锈钢片上加工出线宽90μm、具有复杂形状的微结构。     

正极性电火花加工的损耗机理及其参数分析

本文基于场致发射电子对阳极表面材的料溅射能量分析,研究了引起正极性电火花加工时阳极材料的损耗机理,并给出了正极性加工时电极损耗率的理论极大值与极小值方程。设计并进行了不同工艺参数下紫铜电极和A3＃钢电极单孔电火花加工对比实验,实验表明：相同工艺参数下,紫铜电极比A3＃钢电极加工时的极间放电能量大,加工效率对比上前者是后者的极的75倍多,但电极材料的损耗率对比上,前者是后者的近10倍;不同工艺参数下,极间有效放电时间和放电能量越大,加工效率越高,相应的电极的损耗率也增加,但损耗率的增加程度要远小于加工效率的提高程度。     

微纳米薄膜的悬浮腐蚀法

介绍了一种腐蚀薄膜的研制方法及其装置.为制备带有各种金属引线及电极的大面积超薄悬浮薄膜(厚度:50～500nm、1～5μm;面积:3mm×2mm、10mm×5mm)提供了一种有效的方法.提高成品率30%,具有装置结构简单、支架体积小、质量轻、易于加工、操作方便、经济耐用、造型可根据器件需要加工设计等优点.     

负极性电火花加工时的电极损耗机理及积碳层的减损作用研究

本文基于场致发射理论,对负极性电火花加工时电极材料的损耗情况及极间做功能量进行了研究,设计并分别进行了不同工艺参数下紫铜电极和A3#钢电极单孔负极性电火花加工对比实验.实验研究结果表明:相同工艺参数下,紫铜电极比A3#钢电极加工时的极间放电能量大,加工效率高且电极材料的损耗率低:表面积碳层对紫铜电极材料有着良好的减损作用,而对A3#钢电极则作用甚微;且对紫铜电极而言,在保证有效消电离的情况下,极间有效放电时间比越高,加工效率越高,电极的损耗率越低,而相应的积碳层对电极材料的减损率则减小.     

电火花铣削钛合金电极损耗在线补偿研究

根据电火花铣削等损耗理论，对用电火花铣削钛合金的加工中电极损耗补偿作了分析阐述。并根据正交试验的数据对理论分析结果进行对比，同时给出了一定的结论和建议。     

一种集成式压电驱动微型电火花加工装置

首先概括了压电微驱动技术在电极直接驱动的微小型电火花加工装置中的应用现状。在此基础上，结合线电极电火花磨削技术，提出了一种压电驱动的、可实现多种形式的电极旋转和轴向进给的集成式电极直接驱动微小型电火花加工装置。介绍了该新型机构的原理并对其进行了初步的建模与有限元分析。该机构具有结构简单，可实现多种运动形式合成的特点，可应用于多种微驱动场合。     

基于氮化铝技术的表贴型微波封装

采用氮化铝多层布线技术,运用垂直过渡方式实现微波信号从基板底部到表面的信号传输,完成表贴式微波封装设计。在DC-18GHz内,该表贴互连反射损耗小于-15dB,插入损耗小于1.0dB。采用该技术封装了6～18GHz宽带放大器,封装尺寸为5mm×5mm×1.2mm,频带内反射损耗小于-10dB,增益15dB,平坦度小于1dB;另外还封装C波段5W功率放大器,封装尺寸为8mm×8mm×1.2mm,带内增益大于25dB,反射损耗小于-10dB,饱和输出功率37dBm,效率35%。采用技术的表面贴装放大器性能上能够满足微波通信、雷达应用,可用回流焊安装,适合规模生产。     

微凸起及微坑结构的放电加工基础性研究

机械零件表面形成微凸起及微坑结构在摩擦学、仿生制造等领域具有重要意义.微细电火花加工是一种重要的精密微细加工技术,已经成为微三维实体制造的有效手段之一.通过选用合适的切割轨迹和电参数,能以电火花线切割微精加工多种形状的微凸起电极,继而以电火花成形加工出微坑结构;或者直接用电火花线切割加工微凸起结构.分析了加工电参数对电极制备精度的影响及加工前后电极形状尺寸的变化,研究了所获微坑的几何参数及表面形貌特性,并对微凸起、微坑以及平面结构的摩擦磨损性能进行了初步分析比较.     

Technology innovation and process integrations for sub-100nm gate patterning

This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration.     

White organic light-emitting devices based on fac tris（2- phenylpyridine） iridium sensitized 5,6,11,12-tetraphenylnap -hthacene

We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.     

Complete approach to automatic identification and sub-pixel center location for ellipse feature

To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

A Versatile Mixed-Signal Pin Approach for Cost-Effective Test of Automotive ICs

Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.     

INTEGRATION OF OPTICAL AND WIRELESS NETWORKS

正For a long time,optical and wireless systems/net-works are developed in separate communities witha few attempts for in-depth convergence.In fact,it prom-ises many advantages to combine the optical and wire-less technologies in the levels of systems and networks.Recently,both academia and industry have made manyefforts to enter a new phase of development to take op-tical and wireless systems as fully integrated networks.To provide high bandwidth and reliable service for bothfixed and mobile users,a well-designed network must     

社长序言（英文）

正Happy New Year!As we step into a new year,we take a look back at the key feature topics covered in China Communications over the past 12 months and set out our expecta-     

云计算专题（英文）

正Cloud computing is a novel computing paradigm that utilizes remote cloud resources to achieve a high-performance computation.Cloud provides infrastructure,platform and software as different on-demand services.China has made remarkable progress in cloudbased products and operating system technology.The government,enterprises and research institutions are all active in the development of cloud computing-related projects.Despite the progress,many important problems     

Call for Papers—Feature Topic,Vol.12,No.3,2015

正Smart Grid Communications The electric power industry is undergoing profound changes as the industry aims to capture the promise of a smart grid for a sustainable energy future.Enabled by the advanced sensing devices such as Phasor Measurement Units(PMUs),increasingly powerful