Fabrication of Dicing-Free Vertical-Structured High-Power GaN-Based Light-Emitting Diodes With Selective Nickel Electroplating and Patterned Laser Liftoff Techniques

Through the use of selective nickel (Ni) electroplating, patterned laser liftoff technique, and surface roughing of the top n-GaN epilayer, a novel process for the fabrication of vertical-structured metal-substrate GaN-based light-emitting diodes (VM-LEDs) to avoid difficulties in Ni substrate dicing and improve device yield was proposed and demonstrated. In conjunction with a sidewall passivation with SiO₂ and keeping the size of epilayer smaller than that of Ni island, a considerable improvement in yield and device performance were shown. As compared to conventional lateral-structured GaN-based LEDs, VM-LEDs show an increase in light output power about 174% at 350 mA with a significant decrease in forward voltage from 3.5 to 3.17 V     

The use of transparent conducting indium-zinc oxide film as a current spreading layer for vertical-structured high-power GaN-based light-emitting diodes

In this study, the performance of vertical-structured high-power GaN-based light-emitting diodes (VM-LEDs) with a transparent and low-resistant indium-zinc oxide (IZO) film as a current spreading layer (CSL) was investigated. Nickel electroplating and patterned laser liftoff techniques were employed for the transfer of sapphire substrate to nickel substrate. The novel IZO CSL atop n-side-up VM-LEDs offering benefits of superior current spreading ability, larger extraction efficiency, and lower forward voltage drop was demonstrated. As compared to the regular LED without IZO CSL, the use of an IZO CSL with an optimum thickness of around 300 nm leads to an increase in light output power by 97.1 (67.8)% and a decrease in forward voltage drop by 4.9 (15.5)% under an injection current of 350 (800) mA.     

Shift-invariant interpattern association neural network

A shift-invariant neural network that uses the translation-invariant property of the modulus Fourier spectra with the heteroassociation interpattern association memory is proposed. A binary encoding of a spectral sampling of the training set is used to preserve the main features. Computer simulations and experimental demonstrations are provided that show the shift-invariant property of the proposed optical neural network.     

露天矿机械铲采宽优化问题的研究

本文分析了露天矿机械铲采宽与其效率、采宽与工作线长度、采宽与工作帮坡角以及采宽与霉天矿运输道路长度的关系，并给出了它们之间的关系表达式、绘制出了函数曲线。通过对矿山费用随采宽变化的研究，确定了露天矿最优的采宽值。     

更换废热锅炉对流管束的工艺方法探讨

废热锅炉对流管束更换的工艺方法选择,直接影响到废热锅炉的维修质量和日后的使用,本文对施工中重要的更换工序包括对流管束的拆除、管子及管板硬度试验、管子退火、管端打磨到更换新对流管束等施工方法进行介绍.     

Al—Si—Cr—Mo合金蠕铁热物性的研究

采用正交设计法，对Ａｌ－Ｓｉ－Ｃｒ－Ｍｏ合金蠕铁的热物理性能进行了测试，并分别结合方差分析，对Ａｌ、Ｓｉ、Ｃｒ、Ｍｏ各项性能影响的显著性进行了判断．结果表明，Ａｌ－Ｓｉ－Ｃｒ－Ｍｏ蠕铁具有很好的抗氧化性、抗生长性和抗热疲劳性能，是一种较好的玻璃模具材料．     

Experimental demonstration of fast simultaneous wavelength switching and time demultiplexing using a nonlinear optical loop mirror

Simultaneous all-optical high-speed wavelength switching and time demultiplexing is experimentally demonstrated using a nonlinear optical loop mirror, an integrated passive wavelength router, and fast optical space switches. With >1.2-GHz wavelength switching speeds and 2.5 Gb/s time demultiplexing speeds, both packet switching and isolated-bit extraction are demonstrated. The time switching can potentially be applied to data rates >100 Gb/s.     

基于虚拟仪器的网络化机械装备检测实验系统

提出了网络化机械装备检测实验室的整体设计方案,对系统的整体功能、主体框架和部分功能模块进行了具体实现.基于B/S网络结构,应用ASP技术和虚拟仪器技术,对检测实验系统的结构和功能进行了整体设计,并完成了网络化实验室系统网站的整体框架设计和界面设计.所开发的检测实验系统具有良好的维护性和扩展性,能够在实验教学和研究中应用...