A continuous-wave hybrid AlGaInAs-silicon evanescent laser

We report a novel laser architecture, the hybrid silicon evanescent laser (SEL), that utilizes offset AlGaInAs quantum wells (QWs) bonded to a silicon waveguide. The silicon waveguide is fabricated on a silicon-on-insulator wafer using a complimentary metal-oxide-semiconductor-compatible process, and is subsequently bonded with the AlGaInAs QW structure using low temperature O/sub 2/ plasma-assisted wafer bonding. The optical mode in the SEL is predominantly confined in the passive silicon waveguide and evanescently couples into the III-V active region providing optical gain. The SEL lases continuous wave (CW) at 1568 nm with a threshold of 23 mW. The maximum temperature for CW operation is 60/spl deg/C. The maximum single-sided fiber-coupled CW output power at room temperature is 4.5 mW.     

虚拟仪器技术在模拟电子技术实验中的应用

给出了虚拟仪器技术的概念。并提出了一种用于模拟电子技术实验的虚拟仪器设计方案。     

1-(2-吡啶偶氮)-2-萘酚分光光度法测定硫酸阳极氧化液中铜

研究了铜与1-(2-吡啶偶氮)-2-萘酚(PAN)的显色反应,建立了测定硫酸阳极氧化液中铜的新方法。以TritonX-100为增溶增敏剂,明胶作稳定保护剂,在酸性条件下Cu-PAN络合物稳定保持在水相中,直接进行光度分析。该络合物在558nm处有最大吸收峰,其表观摩尔吸光系数ε=2.25×104L.mol-1.cm-1。方法检出限为0.028μg/mL,线性范围为0～3.2μg/mL,用于测定硫酸阳极氧化液中的铜,加标回收率为98.2%～105.6%,相对标准偏差≤0.34%。     

时间分解光谱技术在钢铁分析中的应用

研究了单火花光谱在不同采样时间段分析灵敏度与窗口的关系,P、S、Al、Ni、Ti、B、Mg、Sb、Pb、As、Bi、Ta、Sn应用TRS技术检出限明显降低,而C、Si、Mn、Cr、Mo、V、W、Co、Nb则不显著;合适的采样窗口能提高Sb的分析准确度,Mg则可减少背景波动带来的影响,Cu可扩大分析线性范围;采用TRS技术在诸有效元素中分析灵敏度可提高1.36～5.00倍,能更好地满足品种钢的研究开发与生产检验的需求.     

高校学报科学化管理问题研究

高校学报目前的发展受到诸如学术导向性定位缺失的影响、管理因素的影响和其它非正常因素的影响，而改变这一状况的最有效的方法是科学化的管理，包括准确的特色风格定位、优化的系统要素关系和良好的编者素质等。经济规律和系统理论则表明实行科学化管理是高校学报生存与发展的唯一选择。     

Java虚拟机中类装载机制的原理分析与应用研究

Java类的动态装载机制是Java虚拟机的一项核心技术,可以在运行时刻动态地加载或替换系统的某些功能模块,而不影响系统其它功能模块的正常运行。本文介绍了Java虚拟机中类的动态装载机制的原理、实现及应用,分析了类装载器的结构、用途,阐述了利用自定义类装载器装载并执行Java类的过程。     

钢丝圈的失效分析

对72B纺织用钢丝圈进行失效分析，发现钢丝圈使用性能不合格的主要原因是热处理炉仪表指示温度偏差太大及热处理工艺规范不合理，使得球化退火后的金相组织出现粗晶铁素体，淬火和回火后的金相组织出现铁素体、粒状渗碳体，使材料塑性增加，满足不了使用性能。     

Development of grain boundary allotriomorphic ferrite/granular bainite duplex steel

A new hot-rolled low alloy high strength steel with grain boundary allotriomorphic ferrite/granular bainite duplex micro-structure has been developed through novel microstructure and alloying designs without any noble metal elements such as nickel and molybdenum. Its as-rolled microstructure and mechanical properties, fatigue crack propagation behavior compared with single granular bainitic steel as well as continuous cooling transformation, were investigated in detail. The measured result of CCT (continuous cooling transformation) curve shows that such duplex microstructure can be easily obtained within a wide air-cooling rate range. More importantly, this duplex microstructure has much better combination of toughness and strength than the single granular bainite microstructure. It is found that the grain boundary allotriomorphic ferrite in this duplex microstructure can blunt the rni-crocrack tip, cause fatigue crack propagation route branching and curving, and thus it increases the resistance to fati     

多线程通信方法在高频幅度控制中的应用

高频系统幅度控制环路开环时，束流将会在腔上引入与正常工作腔压可比的场，流强升高时束流要从腔上得到更多功率，此时腔自身消耗的功率保持不变，这就要求高频幅度控制发挥作用，满足束流和腔功率的要求。作为高频系统监控程序的一个组成部分，本文采用了多线程串口通信的方法实现了对SSRF高频系统激励电平的控制。     

The AC losses measurement and analysis of superconducting NbTi CICC for HT-TU superconducting Tokamak

Superconducting TF and PF coils have been measured in SULTAN test facility. Segregated copper strands are included in four NbTi CICC and this is a technical innovation. Two AC losses measurement methods, calorimetric and electromagnetic methods, have been used in the experiments, and a broad frequency range (from 0.05 Hz to 6 Hz) is covered in sample test. The purpose of this experiment was to investigate AC losses of TF and PF CICC conductor including segregated copper and to check the design of PF and TF CICC coated with different resistive barriers (Pb-30Sn-2Sb and Ni plating on NbTi strands).