AM29F800B与MC68376的接口方式及其在线编程

详细介绍了AM29IZ800BT与Motorola32位单片机MC68376的特性及其接口设计,采用C语言编写FLASH擦写程序,并通过MCU将用户程序代码写入FLASH,来实现在系统编程。     

On the convergence of He's variational iteration method

In this work we will consider He's variational iteration method for solving second-order initial value problems. We will discuss the use of this approach for solving several important partial differential equations. This method is based on the use of Lagrange multipliers for identification of optimal value of a parameter in a functional. This procedure is a powerful tool for solving the large amount of problems. Using the variational iteration method, it is possible to find the exact solution or an approximate solution of the problem. This technique provides a sequence of functions which converges to the exact solution of the problem. Our emphasis will be on the convergence of the variational iteration method. In the current paper this scheme will be investigated in details and efficiency of the approach will be shown by applying the procedure on several interesting and important models.     

SPEED方法萃取高温合金中的MC碳化物晶体生长的研究

利用SPEED方法萃取定向凝固镍基高温合金中的MC碳化物晶体后进行SEM-EDX分析,其结果在似稳场条件下的MC碳化物晶体与从高温合金熔体中的生长的MC碳化物的浓度分布规律相一致。     

薄煤层高档工作面单体柱钻底问题的研究

对晋普山煤矿9#煤顶板压力大、底板松软、支柱钻底严重、初撑力达不到标准化的问题进行了研究,提出了采用MC尼龙柱鞋进行试验的建议,并证明了它对解决薄煤层高档工作面单体柱钻底的问题有较好的效果。     

MC1R天然拮抗剂的高通量初步筛选

为了寻找高效稳定的黑色素皮质激素受体1(melanocortin 1 receptor, MC1R)的拮抗剂,利用作者前期工作中建立的高通量筛选方法对 1 000种中草药提取物进行了筛选,并检测了这些提取物对小鼠B16-F1细胞系黑色素生成量的影响.结果表明,补骨脂等10种粗提物具有拮抗促黑激素（MSH）激活MC1R的作用.其中,补骨脂、破茎松萝、桑根和太白树粗提物能明显降低B16-F1细胞的产黑色素能力,但其机制有所不同,补骨脂主要作用于MSH对C1R的激活过程,而其余3种提取物基本上直接作用于cAMP通路.本实验为利用上述中草药调控皮肤细胞中的黑色素生成提供了初步线索.     

基于FlexRay总线的汽车发动机控制系统设计

本文在深入学习FlexRay总线的基础之上,研究分析汽车发动机控制系统的构成,并提出一种用FlexRay总线来实现对其控制的设计。文中采用飞思卡尔高性能单片机MC9S12XF512,独立通信控制器MFR4310和FlexRay总线驱动器TJA1080,给出电路整体设计方案及软件设计流程,对汽车FlexRay总线的发动机控制系统节点开发具有一定的参考价值。     

基于MC9S12XS单片机的直流电机PWM调速系统设计

为了实现直流电动机的无极调速,提出了以MC9S12XS128单片机为核心,利用MC33887H桥功率驱动芯片构建PWM无级调速控制系统。该系统可以减少主回路电子器件,起停时对直流系统的冲击小,能够满足调速范围大、精度高的性能需求。     

Structure formation in monolayers composed of hard bent-core molecules

ABSTRACT

We investigate the role of excluded volume interactions instabilising different structures in monolayers filled with bent-shaped molecules using the Onsager type of density functional theory supplemented by constant-pressure Monte-Carlo simulations. We study influence of molecular features, like the apex angle, thickness of the arm and the type of the arm edges on the stability of layered structures. For simple molecular shapes taken the observed phases are dominated by the lamellar antiferroelectric type as observed experimentally, but a considerable sensitivity of the ordering to details of the molecular shape is found for order parameters and wave vectors of the structures. Interestingly, for large opening angles and not too thick molecules, a window of stable nematic splay-bend phase is shown to exist.     

基于飞思卡尔单片机的双电机定位控制系统

本文介绍了一种以飞思卡尔单片机系列MC9S12DG128控制两个直流无刷电机以实现定位的方法。结合PID算法,通过MATLAB仿真和实验,该系统成功地控制了两台电机的运行,并取得了很好的控制效果。     

凹凸棒土改性MC尼龙的研制

为提高MC尼龙的综合性能,通过碱催化阴离子聚合反应制备凹土填充尼龙复合材料。采用扫描电镜对复合材料的微观形貌进行观察,研究改变凹土添加量对聚合反应的影响,并利用DSC测试其热性能。结果表明,经活化偶联处理的凹土与尼龙基体的界面结合良好,凹土的加入提高了复合材料的耐热性能,凹土的最佳投加量为0.5 g,这样制得的复合材料耐热性能最好。