C49 defect influence on the C49–C54 transition

The C49–C54 transformation has been studied in TiSi₂ thin films having different concentration of defects. The defect concentration in the C49 phase has been varied using different thermal processes in the 460–540 °C temperature range; in fact, the defect concentration decreases with increasing the temperature and/or the duration of the thermal process as attested by the large variation of the silicide residual resistivity at 4 K. The kinetics of the transformation at 650 °C has been followed by in situ resistivity measurements and, for each sample, the transition time decreases as the defect concentration in the metastable phase decreases.     

单片机串行通信波特率的自适应实现方法

串行数据通信是各种单片机多机应用系统和开发系统中不可或缺的功能，而如何实现通信双方速率的匹配极为重要。文中提出了一种由从机自动适应主机波特率的新方法，此法方便实用，握手时间快。此方法成功地应用于SST89C54／58构成的IAP编程系统中，同样也适用于各种类型的单片机系统。     

Influence of mechanical surface treatments on the high cycle fatigue performance of TIMETAL 54M

TIMETAL 54M (in the following Ti-54M) is a newly developed (α + β) titanium alloy with nominal composition Ti-5Al-4V-0.6Mo-0.4Fe. The alloy can provide a cost benefit over Ti-6Al-4V due to improved machinability and formability. These attractive properties might be a driving force for replacing Ti-6Al-4V in many aircraft as well as biomedical applications. Since HCF performance is one of the most important requirements for these applications, it is essential to improve this property by microstructural optimization and by mechanical surface treatments such as shot peening or ball burnishing. The latter improvement is mainly the result of induced near-surface severe plastic deformation which results in work-hardening and the generation of compressive residual stresses that retard fatigue crack propagation. The main aim of the present study was to investigate the potential fatigue life improvements in Ti-54M due to shot peening and ball-burnishing. The process-induced residual stresses and stress-depth profiles were determined by energy-dispersive X-ray diffraction (ED) of synchrotron radiation with the beam energy of 10-80 keV. Results on Ti-54M and Ti-6Al-4V will be compared and correlated with the mean stress and environmental sensitivities of the fatigue strengths in the microstructures.     

基于单片机控制的时钟芯片SD2203AP的应用设计

时钟芯片SD2203AP具有内置晶振、两线式I^C总线通讯方式、高精度免调校,且与MCU的通讯接口电路简单,内部时钟精度高且功耗低的特点。文中详细介绍该模块的工作原理、应用举例（单片机STC89C54控制SD2203AP的硬件接口电路设计和软件编程方法）及应用中的一些注意事项。     

DSP外部FLASH烧写的两种方法

通过烧写DSP外部程序存储器的实例,阐述了TMS320C54x系列DSP芯片在线烧写外部存储器和编程器烧写外部存储器两种通用的烧写方法。在TMS320C5409外挂AT29LV1024的硬件结构基础上,给出部分硬件连接方案和C语言在线烧写程序以及编程器烧写的关键步骤。     

Ungeregelter Baulandbereich; auffallende Abweichungen zu anderen Bauwerken; Sachverständigengutachten

Die Feststellung auffallender Abweichungen betreffend die Geb?udeh?he erfordert eine begründete Festlegung des Bezugsbereiches sowie eine Auflistung der erhobenen Geb?udeh?hen.     

CCS集成环境下C与汇编的混合编程实现

本文对在TI公司提供的CCS集成开发环境下，编写采用C与汇编的混合编程实现的工程设计程序需要注意的问题，做了较完整的论述。详细地介绍了C与汇编的混合编程接口，并给出了实例。     

基于RBFNN和GA优化设计DGS微带*线

采用神经网络与遗传算法相结合的方法,对一种缺陷接地结构微带线进行优化设计。整个优化设计过程分为两步进行：首先采用基于混合递阶遗传算法优化训练的RBF神经网络对缺陷接地结构微带线进行建模,当神经网络模型训练成功后就实现了对这种缺陷地结构微带线传输系数快速和精确的输出仿真;然后利用该神经网络模型,并结合遗传算法共同优化设计这种缺陷地结构微带线的传输系数和尺寸参数。仿真结果验证了该方法的有效性和准确性。     

改性凹凸棒石对碱性蓝54的吸附试验研究

用静态吸附法研究了改性凹凸棒石对碱性蓝54的吸附特性,探讨了初始pH值、温度以及染料初始浓度等因素的影响。结果表明吸附动力学较好地符合Lagergren二级吸附速率方程。利用两种等温线方程对吸附过程进行拟合,显示不同温度下的吸附等温式都与Langmuir方程符合。热力学分析表明,吸附过程吸热,吸附焓变△H和熵变△S均为正值,吸附自由能变△G为负值。