Characterization of one-step,chromate-free,primer systems using liquid-state Si and C NMR

Coatings derived from organofunctional silanes have been investigated as possible replacements for the chromate-based systems used in the aerospace industry. In this study, organofunctional silanes [bis-(triethoxysilylpropyl)ethane and bis(triethoxysilylpropyl) tetrasulfide] were reacted with commercially available acrylate (ECO-CRYL™ 9790) and epoxy (EPI-REZ™ WD-510) resins, resulting in a one-step, low-VOC, chromate-free primer. Liquid-state ²⁹Si and ¹³C NMR were used to determine structural characteristics of various optimized formulations.     

Validity of dynamic electrochemical impedance spectra of some amine corrosion inhibitors in petroleum/water corrosive mixtures by Kramers-Kronig transformation

In our previous works, the corrosion inhibition properties of propylamine (PA), iso-propylamine (i-PA), butylamine (BA), tert-butylamine (t-BA), hexylamine (HA), ethylenediamine (EDA), diethanolamine (DEA), 3-amino-1-propanol (3-AP), 2-dimethylethanolamine (2-DEA), cyclohexylamine (CHA), N-methylcyclohexylamine (N-MCA) and dicyclohexylamine (DCHA) have been investigated by means of electrochemical impedance spectroscopy (EIS) with a carbon steel rotating disc electrode in some petroleum/water corrosive mixtures containing acetic acid and NaCl at 25 °C. In this work, the Kramers-Kronig transformations (KKTs) were applied to evaluate the validity of the impedance data of these amine compounds in hydrodynamic condition. The results obtained showed that experimental impedance data did not satisfy in K-K relations completely viz. indicated some errors. These errors were related to stray capacitances, external transmission line effects, pits formation and change in interface during data acquisition at high and low frequencies regions. In addition, the selection of a suitable equivalent circuit strongly emphasized to better interpret of EIS data which in turn cause better resulted KKTs spectra. With considering obtained transformations, more effective inhibitor was selected with regard to its charge transfer resistance, the corrosion capacitance and well satisfying in K-K relations.     

Debugging programs that use macro-oriented data abstractions

Enhanced C (EC) is a set-oriented, extensible, C-like language. EC uses data abstractions to define new types. These data abstractions, called clusters, are macro-like devices that perform substitution on the typed syntax tree. Debugging programs that use clusters raise problems that are not encountered in ordinary programming languages. At compile time there is a need to determine and report whether the macro expansion will result in a legal program before this expansion actually takes place. At run-time the problems are how to account for replaced statements and how to handle variables whose types have been established by the clusters, variables that disappear, or variables whose names have been changed. This article presents these problems and their solutions as implemented by the EC compiler and the EC symbolic debugger. Similar debugging problems appear in other languages: The need to handle variables at run time is common to all languages that support data abstraction even if the abstractions are procedure oriented; also, a mild form of the problem of the replaced statement appears in inline procedure substitution of Ada. The solutions developed for the EC debugger apply to these cases as well.     

用C++ Builder实现数字图像的平滑处理

介绍了图像增强技术中，空间域处理方法中的邻域平均法的原理、算法，及该原理在windows平台上以C＋＋ Builder为开发工具的具体程序实现。     

从模式I2C总线接口电路设计及其VLSI实现

提出了一种从模式的I^2C总线接口电路，该接口电路实现了对可变参数ASIC芯片的配置。该电路的设计使得可配置的ASIC芯片中参数配置所需要的芯片管脚大大减少。该方案已通过行为仿真和综合后门级时序仿真，并且用无锡上华0.6μmCMOS工艺实现。     

Development of a single loop EPR test method and its relation to grain boundary microchemistry for alloy 600

A single loop electrochemical potentiokinetic reactivation test method has been developed for alloy 600 that produces good passivation on all the surfaces, good etching during the reactivation scan and no appreciable pitting. It is able to quantify and discriminate between samples with a wide range of degree of sensitization. The Pa value correlates well with the minimum level of chromium in the depletion regions at the grain boundaries. It has been shown that the width of the attacked regions is much larger than the width of chromium depletion regions and it does not show any direct correlation with either depth or width or with a volume parameter of chromium depletion regions. It has been shown that the chromium carbides are not attacked during the test and that the intragranular regions attacked during the test are the sites of chromium carbides in the grain matrix. A modified Pa parameter is shown to be sensitive down to 7.5 wt% chromium in the depletion regions and indicates that the intragranular carbides have shallower depletion profiles than those at grain boundaries. Comparison of the results of the single loop and the double loop tests showed a good correlation.     

B4C涂层作为等离子体面对材料的一些性质

介绍了利用等离子喷涂设备,B4C/Cu梯度功能涂层及非梯度涂层的制备技术,在模拟实验装置中测量了在高能粒子(3 keV,D+)的作用下,B4C涂层的化学溅射产额、热解吸性能、热冲击性能及热导率.结果表明B4C是一种有希望为未来聚变装置中等离子体面对的材料.     

多任务调度算法在单片机控制系统中的应用

为了满足单片机控制系统的复杂要求 ,提出了多任务调度算法 ,通过与单任务程序结构的对比和分析 ,详细说明了多任务调度算法的实现 ,指出了应用该算法的必要性 ,并且以科研生产的实例说明其具体应用。     

表达式句法分析及求值算法在优化设计中的应用

针对优化设计技术在机械工程领域的使用特点提出了一种应用表达式分析与求值原理以避免对每个优化模型或实例均需编程求解的解决方法,论述了该方法的要求、原理、实现过程及应用程序框架。     

TMS320C2XX的软件堆栈

介绍了对德州仪器（TI）公司的TMS320C2XX系列DSP芯片的8级硬件堆栈进行软件扩展的方法，给出了在内存在扩展堆栈的两个宏定义和中断服务程序。