基于K型热电偶的瞬态高温测试调理电路

本文针对导弹爆炸场瞬态高温度测试系统的特定要求,设计了一套基于K型热电偶的单电源传感器调理电路。该电路以单电源仪表放大器INA155、模拟开关MAX4638、二阶有源压控低通滤波器为核心,实现了对热电偶输出信号的可控放大,以及滤波去噪。经过验证,该调理电路配合采集电路,可记录完整的爆炸场温度变化。     

基于单片机的汽车刹车片实时温控系统

温度是影响刹车片性能的一个重要的环境变量,它直接制约着刹车片的制动性、耐磨性等各方面的性能。为了提高汽车行车制动安全,一方面可从材料上提高其制动性、耐磨性,另一方面也可利用现代电子技术引入刹车片实时温控的概念改善刹车片工作性能。文中提出了一个利用AT89C2051单片机对温度传感器MAX6577输出的信号频率进行计算处理,控制引自汽车水箱的冷却管线上的电磁阀开关,从而实现汽车刹车片温度实时监控的设计方案。该设计包括温度控制,水箱液位检测和报警等内容。     

单片机开发最小系统实验板

本文设计了一个单片机最小开发系统实验板,该实验板可以进行多种项目开发,例如液晶显示、智能汽车、LED等多种控制,是一款实用性强的开发系统。     

Prediction of superconductivity of Ta2AlC: in situ Raman spectrometry and density functional investigations

In this paper, in situ Raman spectra of Ta₂AlC are measured in the temperature range of 80–500 K at ambient pressure. The frequencies of the Raman modes decrease with increasing temperature, which have been explained by the anharmonic and thermal expansion effects. The line‐width of E_2g (ω₃) mode increases at elevated temperatures, which is found to be due to the anharmonic phonon–phonon scatterings. On the other hand, the line‐widths of E_2g (ω₁) and A_1g (ω₄) modes decrease continuously with increasing temperature, which is explained by the electron–phonon couplings of these two phonon modes with the Ta 5d electrons. The electron–phonon coupling strengths are obtained both in experiments and density functional calculations. Finally, Ta₂AlC is predicted to be a new superconductive MAX phase. Copyright © 2014 John Wiley & Sons, Ltd.     

将VHDL语言引入数字电路教学的探讨

论述了在＂数字电路＂教学和实验中普及VHDL语言的必然性和必要性,对VHDL硬件描述语言的授课和实验方法作了初步探索。     

Efficient 2 and 3-Flip Neighborhood Search Algorithms for the MAX SAT: Experimental Evaluation

For problems SAT and MAX SAT, local search algorithms are widely acknowledged as one of the most effective approaches. Most of the local search algorithms are based on the 1-flip neighborhood, which is the set of solutions obtainable by flipping the truth assignment of one variable. In this paper, we consider r-flip neighborhoods for r = 2, 3, and examine their effectiveness by computational experiments. In the accompanying paper, we proposed new implementations of these neighborhoods, and showed that the expected size of 2-flip neighborhood is O(n + m) and that of 3-flip neighborhood is O(m + t ² n), compared to their original size O(n ²) andO(n ³), respectively, where n is the number of variables, m is the number of clauses and t is the maximum number of appearances of one variable. These are used in this paper under the framework of tabu search and other metaheuristic methods, and compared with other existing algorithms with 1-flip neighborhood. The results exhibit good prospects of larger neighborhoods.     

VRML及其在远程多媒体教学系统中的应用

虚拟现实在当今国际上是一个倍受关注的课题,ＶＲＭＬ作为其重要的开发工具,在社会生活的诸多领域得以广泛地应用。本文重点介绍了虚拟现实技术的特征和发展现状,虚拟现实建模语言ＶＲＭＬ的基本概念、特色功能及其应用的范围。在此基础上,论述了ＶＲＭＬ在现代远程多媒体教学系统中的应用途径和方法,并通过用插值器操作对象、构造视点动画等方法,结合三维动画制作软件设计了一个切实可行的动态模型实例,很好地实现了远程教学过程中的抽象教学内容具体化,进而阐明虚拟现实建模语言ＶＲＭＬ在未来生活中必将得到多样化的应用。     

基于MAX1320的多通道同步数据采集卡的实现

设计了基于MAX1320的多通道同步数据采集卡,通过CPLD逻辑控制,采用C 设计驱动程序,实现了对多达8路信号的同步采样,满足了多点温度信号同步采样的要求.数据采集卡结构简单、可靠,符合PC104总线规范,相关软件编制方便.     

DSP的直接存储控制器DMA的接口设计

介绍了TMS320VC5410DSP的直接存储控制器DMA的特点，给出了一种适用的DMA结合外部中断组成的数据采集系统的设计方案，该设计具有设计灵活、硬件简单、CPU执行效率高的特点。     

基于MAX125的多路数据采集芯片在电力系统中的应用

介绍了基于MAX125的14位双4路准同步数据采集系统的设计 ,该系统以89C52单片机为控制器 ,通过ISA总线与PC机之间实现数据交换 ,可实现多路电流、电压的同步测量。