一种基于单片机的半导体激光器电源控制系统的设计

介绍了一种以C8051F高速单片机为核心的半导体激光器驱动电源的控制系统。半导体激光器的工作电流是通过恒流源及光功率反馈控制的,其中恒流源采用达林顿管作为调整管,他可调整大范围的输出电流,可为半导体激光器提供稳定、连续的电流,并且具有慢启动和保护电路等功能。     

Energetics of Donor‐Doping,Metal Vacancies,and Oxygen‐Loss in A‐Site Rare‐Earth‐Doped BaTiO3

The energetics of La‐doping in BaTiO₃ are reported for both (electronic) donor‐doping with the creation of Ti³⁺ cations and ionic doping with the creation of Ti vacancies. The experiments (for samples prepared in air) and simulations demonstrate that ionic doping is the preferred mechanism for all concentrations of La‐doping. The apparent disagreement with electrical conduction of these ionic doped samples is explained by subsequent oxygen‐loss, which leads to the creation of Ti³⁺ cations. Simulations show that oxygen‐loss is much more favorable in the ionic‐doped system than undoped BaTiO₃ due to the unique local structure created around the defect site. These findings resolve the so‐called “donor‐doping” anomaly in BaTiO₃ and explain the source of semiconductivity in positive temperature coefficient of resistance (PTCR) BaTiO₃ thermistors.     

临床路径在住院医生工作站的应用

目的：通过临床路径系统在医生工作站中的应用,对我院实施临床路径的医院的情况进行描述、分析,发现其中存在的问题,提出个人建议。对单病种进行有效管理,能规范各项诊疗程序,提高医疗质量,保证医疗安全。方法：采用．NET架构的应用设计方案,完全融合于原有医院信息系统之中,实现无缝链接,对多病区单病种进行有效实施。结论：临床路径管理系统是保证医疗质量,减轻患者负担,增加患者满意度,又能降低医疗成本的新型的病种管理模式。     

浅述“双系统”质量管理方法——军用加固计算机研制项目中的实际运用

该文介绍了质量管理在军工加固计算机研制项目中的重要性,并提出了“双系统”质量管理方法.详细阐述了“双系统”在论证、方案、工程研制、设计和生产定型阶段的实施方法.     

淮河防洪模型控制与检测系统

淮河防洪模型面积４０００ｍ２，应用计算机模型控制与检测系统，可自动地完成７处入流流量控制，互处尾水位控制，６个水闸的启闭控制，１１个行洪口门控制，可设定开门速度，模拟决口冲刷过程；水位采集３７点，流速采集３２点。主控计算机可对试验过程进行实时监控。经应用表明，该系统性能完善，控制与检测准确可靠，为淮河大型防洪模型这一复杂防洪体系试验研究的顺利进行提供了必要的手段。     

船闸水力学试验数据采集处理系统

本文介绍的以ＰＣ微机为中心的船闸水力学试验数据采集和处理系统，适用于各种船闸水力学试验中水动力特性的测量和处理。该系统在ＤＯＳ３．１以上版本下运行，全部功能采用下拉式中文菜单操作，可实现６４通道的数据采集，同时可对采集数据进行在线或事后处理，并绘制成图表。     

连铸机结晶器液位控制系统的设计及仿真分析

本文详细讨论了连铸机结晶器液位自动控制系统的基本构成及设计的有关问题。提出了两种自适应控制方案,并对所提出的设计方案进行了仿真分析。     

Effect of 0.1 at.% zirconium on the cyclic oxidation resistance ofβ-NiAl

The effect of 0.1 at.% Zr (0.2 wt.% Zr) on the cyclic oxidation of hipped -NiAl was studied. Oxidation testing was performed in static air at 1100–1200 °C, using 1-hr exposure cycles for test times up to 3000 hr. The weight change versus time data were modeled with the COSP computer program to analyze and predict cyclic-oxidation behavior. Zr additions significantly change the nature of the scale-spalling process during cooling so that the oxide spalls near the oxide-air interface at a relatively low depth within the scale. Without Zr, the predominantly -Al₂O₃ scale tends to spall randomly to bare metal at relatively high effective-scale-loss rates, particularly at 1150°C and 1200°C. This leads to higher rates of Al consumption for the Zr-free aluminide and much earlier depletion of Al, leading to eventual breakaway (i.e., failure).     

基于单片机的空气消毒机控制系统

针对传统空气消毒方法的缺陷,提出基于红外遥控和低功耗的AT89C2051单片机的动态紫外线空气消毒机控制系统,给出系统的硬件组成和硬软件设计方法。该空气消毒控制系统具有消毒无死角,耗电低、速度快、效能高、性价比高,适用范围广等特点。系统在实际使用,证明其方便、可靠并具有实用价值。     

Intramolecular Dipole Coupling and Depolarization in Self‐Assembled Monolayers

Quantum mechanical and classical atomistic computational methods are used to simulate the chain‐length dependence of depolarization effects in S(CH₂)_n?1CH₃ and S(CH₂)_n?1COOH self‐assembled monolayers on gold (111) surface. These calculations show that due to weak cooperative effects, the electrostatic properties of alkanethiol monolayers are well described by the gas phase dipole moments of the molecules. However, depolarization in monolayers with the molecules carrying head‐ and tail‐group dipoles, such as COOH‐terminated monolayers, strongly depends on the degree of intramolecular dipole coupling. Thus the electrostatic properties of self‐assembled monolayers can be engineered by changing the length of the aliphatic spacer between the polar groups. The transition from strong to weak coupling regime was found to be accompanied by the change in the sign of the asymptotic value of electrostatic potential above the surface of the monolayers and hence in the sign of the metal work function change. Therefore, the use of weakly polarizable spacers between the polar groups inside the molecules forming the SAM is beneficial for accessing a wider range of work‐function changes.