基于GP32的射频读写模块的设计

本文基于模块化设计思想、应用在线编程技术,设计了一种基于Freescale 8位微控制器MC68HC908GP32的射频识别卡Mifare1的读写模块。给出了该模块的设计方案和硬件系统组成,并介绍了其软硬件实现过程。该读写模块不仅能完成对射频识别卡的控制和读写操作,而且可供用户进行二次开发。     

ISP技术在智能仪器中的应用

介绍了ISP技术及其在智能仪器中的应用，得出了ISP技术的优势是不需要编程器就可以进行单片机的实验和开发，单片机芯片可以直接焊接到电路板上，调试结束即为成品，免去了调试时由于频繁地插入取出芯片对芯片和电路板带来的不便。     

Isolation of salmonellae using two forms of Rappaport-Vassiliadis medium and brilliant green agar

The relative efficiencies of Rappaport-Vassiliadis medium containing tryptone (RV medium) or soya peptone (RV-soya) were compared for the isolation of salmonellae from 518 naturally contaminated chicken livers. RV-soya (299 of 518) gave slightly better recoveries than the standard RV medium (295 of 518) although the difference was not statistically significant (P> 0.05). 60% of the samples which were found to be positive after 24 h enrichment in RV-soya were also positive after just 6 h incubation. It was shown that the use of 14 cm plates of brilliant green agar gave better Salmonella recoveries than did 9 cm plates of the same medium. However, when sulphamandelate supplement was incorporated into the medium, recoveries were further increased. We conclude that RV-soya is an effective alternative to the standard RV medium for the isolation of salmonellae from poultry and would recommend a protocol of pre-enrichment in buffered peptone water, enrichment in RV-soya for 24 h at 43°C and plating on brilliant green agar containing sulphamandelate supplement.     

利用锰硅合金粉生产低磷中碳锰铁的理论研究与实验

利用锰硅合金破碎产生的残粉作为生产低磷中碳锰铁的主要原材料,通过分析电硅热法(冷装法)生产中碳锰铁存在的问题和产品碳高、磷高的质量状况,提出了“二步法”脱磷、“二步法”脱硅生产中低碳锰铁的新工艺。根据拟定的工艺实验方案,完成了台架实验和现场模拟实验。实验表明：采用脱磷合金和No．3造渣剂,可以实现MnSi合金同时脱磷、脱碳,合金中磷含量降至0．15％、碳含量降至1．40％以下;脱磷合金用量6％～14％,脱磷率约为18．5％～43．1％;低磷富锰渣预脱硅和锰矿终脱硅的“二步法”熔炼工艺能满足生产低磷中碳锰铁的技术要求。     

MC68CH908QL4在LIN从机系统中的应用

LIN(局部互联网络)是汽车通讯网络中的一种协议标准,简单易行,功能强大,成本低廉。在不要求高传输带宽的情况下,它可以取代成本为其2～3倍的CAN总线网络,并且它还能应用到许多工业控制领域,有很好的发展前景。本文主要介绍了最新的增强型LIN微控制器MC68HC908QL4在LIN总线从机节点上的应用,以及其相比一般UART设备的优势。     

电感电流断续模式下的功率因数校正数字控制解决方案

基于DSP的数字控制逐渐和电力电子应用紧密结合,功率因数校正是电力电子技术的一个重要应用,文中利用FREESCALE新型号MC56F8013的高性能特性,针对电感电流断续工作模式下的功率因数校正应用,完成对应的数字控制解决方案,并用500W实验样机验证了数字控制所带来的优良的系统性能。     

基于简化LSCMA算法的STBCMC—CDMA系统盲多用户检测

在空时分组编码（STBC）的MC—CDMA系统中，根据STBC正交编码的特点，提出了一种简单可行的基于常模（CM）准则的盲多用户检测算法。该算法基于最小二乘常模算法（LSCMA）的盲多用户检测算法，算法大为简化，抽头系数减少了一半，性能略有下降。     

Defining a test coverage criterion for model-level testing of FBD programs

ContextThe Programmable Logic Controller (PLC) is being integrated into the automation and control of computer systems in safety–critical domains at an increasing rate. Thoroughly testing such software to ensure safety is crucial. Function Block Diagram (FBD) is a popular data-flow programming language for PLC. Current practice often involves translating an FBD program into an equivalent C program for testing. Little research has been conducted on coverage of direct testing a data-flow program, such as an FBD program, at the model level. There are no commonly accepted structural test coverage criteria for data-flow programs. The objective of this study is to develop effective structural test coverage criterion for testing model-level FBD programs. The proposed testing scheme can be used to detect mutation errors at the logical function level.ObjectiveThe purpose of this study is to design a new test coverage criterion that can directly test FBD programs and effectively detect logical function mutation errors.MethodA complete test set for each function and function block in an FBD program are defined. Moreover, this method augments the data-flow path concept with a sensitivity check to avoid fault masking and effectively detect logical function mutation errors.ResultsPreliminary experiments show that this test coverage criterion is comprehensive and effective for error detection.ConclusionThe proposed coverage criterion is general and can be applied to real cases to improve the quality of data-flow program design.     

等值面抽取技术在超声探头声场模拟中的应用

为了更好地研究超声波声场,提出了以等值面方式来表现超声探头的声场分布;运用并改进了经典的MC（Marching Cubes）算法得出了圆盘和矩形两种超声探头声源的三维声场等值面描述.实验表明改进后的算法能获得较好的效果.     

基于磁阻传感器的电子罗盘设计

社会生产、生活的许多方面需要用到地磁定向,本文以磁阻传感器为基础,组合加速度计、温度传感器、A/D转换芯片(ADS8364)以及DSP微控制器(MC56F8366)等器件构建了一个具有倾角补偿的电子罗盘,试验表明该系统具有良好的指向能力。