Dipole mode photonic crystal point defect laser on InGaAsP/InP

In this paper, we focus on the dipole mode of the two-dimensional (2D) photonic crystal (PC) single point defect cavity (SPDC) lasers and we report the fabrication and characterization of 2D PC SPDC lasers with the structure of adjusted innermost air holes. The photonic band and cavity Q factors are simulated by means of plane wave expansion (PWE) and finite-difference time-domain (FDTD), respectively. In order to improve the optical confinement of the SPDC, the diameter of the innermost holes was adjusted. Different lasing performances are observed experimentally. The experimental results agree with the theoretical prediction very well. (c) 2006 Elsevier B.V. All rights reserved.

Abatement of waste gases and water during the processes of semiconductor fabrication

The purpose of this article is to examine the methods and equipment for abating waste gases and water produced during the manufacture of semiconductor materials and devices. Three separating methods and equipment are used to control three different groups of electronic wastes. The first group includes arsine and phosphine emitted during the processes of semiconductor materials manufacture. The abatement procedure for this group of pollutants consists of adding iodates, cupric and manganese salts to a multiple shower tower (MST) structure. The second group includes pollutants containing arsenic, phosphorus, HF, HCl, NO2, and SO3 emitted during the manufacture of semiconductor materials and devices. The abatement procedure involves mixing oxidants and bases in an oval column with a separator in the middle. The third group consists of the ions of As, P and heavy metals contained in the waste water. The abatement procedure includes adding CaCO3 and ferric salts in a flocculation-sedimentation compact device equipment. Test results showed that all waste gases and water after the abatement procedures presented in this article passed the discharge standards set by the State Environmental Protection Administration of China.

Raman study of low-temperature-grown Al0.29Ga0.71As/GaAs photorefractive materials

We report on the observation of resonant Raman scattering in low-temperature-grown AlGaAs/GaAs structure. Two kinds of excitation lights, 632.8 and 488 nm laser lines, were used to detect scattering signal from different regions based on different penetration depths. Under the outgoing resonant condition, up to fourth-order resonant Raman peaks were observed in the low-temperature-grown AlGaAs alloy, owing to a broad exciton luminescence in low-temperature-grown AlGaAs alloy induced by intrinsic defects and As cluster after post-annealing. These resonant peaks were assigned according to their fundamental modes. Among the resonant peaks, besides the overtones of the GaAs- or AlAs-like mode, there exist combination bands of these two kinds of modes. In addition, a weak scattering peak similar to the bulk GaAs longitudinal optical mode was observed in low-temperature Raman experiments. We consider the weak signal correlated with GaAs clusters appearing in AlGaAs alloys. The accumulation of GaAs in AlGaAs alloys was enhanced after annealing at high temperatures. A detailed study of the dependence of vibration modes on measuring temperature and post-annealing conditions is given also. In light of our experiments, it is suggested that a Raman scattering experiment is a sensitive microscopic probe of local disorder and, especially performed at low temperature, is a superior method in detecting and analyzing the weak interaction between phonons and electrons.

Two-dimensional ordering of self-assembled InxGa1-xAs quantum dots grown on GaAs(311)B surfaces

The two-dimensional (2D) ordering of self-assembled InxGa1-xAs quantum dots (QDs) fabricated on GaAs(3 1 1)B surface by molecular beam epitaxy (MBE) are reported. The QDs are aligned into rows differing from the direction of the misorientation of the substrate, and strongly dependent on the mole In content x of InxGa1-As-x solid solution. The ordering alignment deteriorates significantly as the In content is increased to above 0.5. The 2D ordering can be described as a centered rectangular unit mesh with the two sides parallel to [0 1 (1) over bar] and [(2) over bar 3 3], respectively. Their relative arrangement seems to be determined by a combination of the strongly repulsive elastic interaction between the neighboring islands and the minimization of the strain energy of the whole system. The ordering also helps to improve the size homogeneity of the InGaAs islands. The photoluminescence (PL) result demonstrates that QDs grown on (3 1 1)B have the narrowest linewidth and the strongest integrated intensity, compared to those on (1 0 0) and other high-index planes under the same condition. (C) 1999 Elsevier Science B.V. All rights reserved.

Application of ICA in on-line verification of the phase difference of the current sensor

The performance of the current sensor in power equipment may become worse affected by the environment. In this paper, based on ICA, we propose a method for on-line verification of the phase difference of the current sensor. However, not all source components are mutually independent in our application. In order to get an exact result, we have proposed a relative likelihood index to choose an optimal result from different runs. The index is based on the maximum likelihood evaluation theory and the independent subspace analysis. The feasibility of our method has been confirmed by experimental results.

Dipole mode photonic crystal point defect laser on InGaAsP/InP

In this paper, we focus on the dipole mode of the two-dimensional (2D) photonic crystal (PC) single point defect cavity (SPDC) lasers and we report the fabrication and characterization of 2D PC SPDC lasers with the structure of adjusted innermost air holes. The photonic band and cavity Q factors are simulated by means of plane wave expansion (PWE) and finite-difference time-domain (FDTD), respectively. In order to improve the optical confinement of the SPDC, the diameter of the innermost holes was adjusted. Different lasing performances are observed experimentally. The experimental results agree with the theoretical prediction very well. (c) 2006 Elsevier B.V. All rights reserved.

基于ActiveX Scripting技术的测试软件开发

测试软件(Tester)的开发不同于一般的软件开发,在测试软件开发的过程中,涉及到测试软件本身和测试用例(Testcase)两者之间的划分和协作.目前的测试用例脚本大都是一些自定义的格式文本,通过测试软件的分析来执行测试逻辑,不仅需要编写大量复杂的脚本解析程序,而且难以阅读和维护.为了解决这个问题,提出了一种基于ActiveX Scripting技术的测试软件开发方法,该方法可以将测试逻辑按照需求分配到测试软件和测试用例,提供了一种统一的编程接口,易于学习和使用.

认证测试的一个扩展

对Guttman等人提出的3种测试中的输入测试（incomingtest）进行扩展，使其能够用来分析使用签名和验证的协议，如CCITTX．509协议等．使用扩展后的输入测试来分析CCITTX．509协议的正确性，发现它的不足之处．

医院制剂生产管理系统的设计与实现

目的设计开发完整的医院制剂生产管理系统,使其满足物资的入出存管理和生产管理的需求。方法在细致分析医院制剂生产的管理流程的基础上,结合企业资源规划系统,采用客户端/服务器模式,应用SQLServer数据库管理系统和PowerBuilder开发工具设计、开发了该系统,主要由库存管理模块和生产管理模块组成,同时具有综合查询、报表输出和系统维护等功能。结果该系统能够与HIS连接,根据HIS销售情况制定生产计划,通过生产计划和现有库存快速制定采购计划,理顺了医院制剂室的工作流程,能够准确、快捷地输出相应的报表。结论该系统设计方案可行,系统操作简单,提高了工作效率,加强了医院的管理工作。

基于实时数据库的卫星测试平台的设计与实现

卫星测试数据的有效存储与展现对卫星测试有着重要的意义,同时随着卫星技术的发展,一颗卫星的多阶段测试,多颗卫星同时测试是不可避免的。而及时有效的处理测试产生大量的实时数据将是极大的挑战。设计并实现了基于实时数据库的分布式卫星测试平台,可以有效地管理多颗卫星的测试,同时结合ACE框架的通讯结构可以有效的对测试间内外的测试人员提供实时的数据监视与精确的历史查询统计。

石油化工行业生产执行系统应用研究

分析了国内外石油化工行业生产执行系统的特点,采用分布对象技术,提出了灵活的可组态的生产执行系统体系结构,该体系结构主要由数据平台、业务逻辑和用户界面3个层次构成;针对物料平衡与数据整合的关键问题,提出了基于多维物料移动模型的多层递阶平衡方法;结合石油化工行业的业务知识和领域知识,设计开发了一个炼化一体化的生产执行软件系统--石油化工企业生产执行系统,并在典型企业进行了应用验证.