基于短信传输方式的无线工业模块设计

介绍了美国德州仪器(TI)公司的16位超低功耗单片机MSP430F135和Siemens公司TC35系列的MC37i。详细介绍了各个部分电路组成和原理。设计并实现了一种基于短信传输方式的无线工业模块。     

车用甲醇汽油燃烧控制器

为了解决甲醇汽油燃料在汽车发动机上冷启动困难,使用范围小等问题,提出了一种带有温度检测的自适应型补偿喷油控制方法,并基于MC9S12系列单片杌完成了控制器的设计。该控制器主要通过采集发动机启动时的进气口温度和转速,实时的调整汽车ECU原始喷油信号的有效喷油时长,使发动机快速平稳的启动,最终实现多比例甲醇汽油在汽车发动机上对汽油的替代。实验应用表明,该控制器具有冷启动顺利、适应燃料多样、控制精确、运行平稳安全、节约燃料开支、节能减排的特点,达到了设计要求。     

A novel multicarrier CDMA transmission scheme for cognitive radios with sidelobe suppression

Noncontiguous multicarrier code division multiple access (MC‐CDMA) is an effective multiple access method for cognitive radio systems that can deploy the noncontiguous vacant parts of a certain spectrum shared with the users of a primary system. However, the large spectral sidelobes of the Fourier transform based implementation of the MC‐CDMA interfere with the adjacent primary transmission. In this paper, a novel complex signature sequence set is proposed for synchronous downlink MC‐CDMA based cognitive radio networks to suppress the sidelobes. To do so, the minimization of the sidelobes power is developed as an eigen‐optimization problem that is optimally solved by using the eigenvalue decomposition method. The optimal complex signature sequences are chosen as the eigenvectors attained by the eigenvalue decomposition of a symmetric matrix that is dependent of the spectral characteristics of the primary users. Simulation results show that by a slight decrease in the maximum number of active users compared with full load, the sidelobes can be considerably suppressed. The effect of cyclic prefix length, the bandwidth of the primary system and the number of active users on the sidelobe suppression performance is analyzed through numerical simulations. Copyright © 2012 John Wiley & Sons, Ltd.     

MC9S08QE4在有源RFID中的应用

正RFID标签分为被动标签(Passive Tags)和主动标签(Active Tags)两种。被动标签即非接触式IC卡,由于被动标签识读距离短,在许多应用中受到限制。主动标签也称有源RFID,由于采用无线射频识别技术,识读距离可达几十米,逐渐成为一种主流应用技术,已经成功应用到生产制造、物流管理、公共安全等各个领域。     

MC56F8013在雷达供电系统中的应用

在雷达供电系统中,基于MC56F8013设计了一款控制器。该控制器能根据外部信号状态及上位机通讯命令,通过继电器驱动交流接触器的方式,控制配电柜输入交流的通断。该监控器利用了MC56F8013端口类型丰富、运算速度快的特点,使得系统硬件简单、灵活。文中简要介绍了MC56F8013的基本架构,系统的电路组成,并给出了软件设计过程中的流程。实际使用验证了系统的有效性。     

Solvent effect on the syn/anti conformational stability: A comparison between conformational bias Monte Carlo and molecular dynamics methods

The solvent effect on the syn/anti population ratio of the mesityl oxide (MOx) was investigated using a new implementation of conformational bias Monte Carlo (CBMC) and molecular dynamics (MD) methods. It was observed by a previous theoretical work (Theor. Chem. Acc. (2012) 131:1214) that in gas-phase the MOx exists dominantly in syn-form and in aqueous solution in anti-form. The syn/anti free energy difference in the gas phase was used in the intramolecular parametrization and a rotational barrier of approximately 10 kcal mol⁻¹ was found. Molecular systems with barriers of this order of magnitude have been studied by experimental techniques. However, they have not been discussed yet comparing CBMC and MD simulations. In this work, we show that the intramolecular geometrical information such as bond lengths, angles and torsional angles sampled with CBMC and MD methods are equivalent. Nonetheless, only the CBMC simulations sample appropriately the syn/anti population ratio. With the CBMC configurations in gas phase, it was obtained 95% in syn-form and 5% in anti-form regardless the initial conformation. An inversion of the population was found in water, 25% in syn-form and 75% in anti-form. Comparing the gas phase and in-water CBMC sampling, it was observed that the MOx spends typically approximately 110 successive MC cycles in anti-form and approximately 2300 in syn-form in gas phase. While it was much larger with explicit water, approximately 400 times more for anti-form and approximately 6 times more for syn-form. We argue that this strong stabilization of the anti-form in aqueous solution, does not come from the MOx-water hydrogen bonds interactions, because they are the same for both conformations. Instead, the stabilization comes from the dipole-dipole interaction caused by a larger dipole moment of the MOx in the anti-form, 7.2 D, than in the syn-form, 5.2 D. With the MD sampled configurations in both conditions, we observe that the syn/anti conformational change is a very rare event due to the rotational barrier, which is approximately 17 times larger than the thermal energy. Therefore, the MD sampling of the MOx is not appropriated because it is strongly dependent on the initial conformation even for large simulations with 150 ns up to 400 ns for the isolated solute and for solute–solvent systems.     

单芯片嵌人式网关在煤矿井下人员定位中的应用

设计并实现了单芯片嵌入式网关(TCP/IP转RS 485)以及在煤矿井下人员定位中的应用.在嵌入式以太网的网关构架下设计了嵌入式硬件和软件,并在实际应用中证明该系统具有成本低、集成度高、速率快以及开发周期短等特点.首次将单芯片以太网引入煤矿井下光纤环网,并设计了简化、实用、高效率的服务器/客服端应用程序.     

基于MC68HC908RF2的无线温度传感器

针对不能直接布线的旋转设备的温度检测问题,设计了一款低成本、微功耗的无线温度传感器.详细阐述了实现方法和设计要点,对系统中采用的关键元器件进行了介绍,给出了系统的硬件结构及软件流程图.设计中充分利用了各芯片的低功耗特性,有效地延长了电池的使用时间.实验证明,此传感器具有良好的可靠性和性价比,有广阔的应用前景.     

基于嵌入式技术的GPS车载终端

本文介绍了基于嵌入式技术的GPS车载终端的设计与实现.首先分析了GPS技术原理,介绍了LPC2131单片机、MC39I和Lassen IQ模块的性能,叙述了车载终端的硬件设计思路,并给出了关键软件代码和编程思路.