基于C8051F020型单片机的仿真随动舵轮的转角检测

介绍了航海模拟训练系统中仿真随动舵轮的转角、转向的检测方法,给出了该方法的工作原理和硬件设计,并进行了软件编程。该设计成本低廉、简单可靠,可推广至任何角度检测系统中。     

M ecanum 轮全方位移动小车嵌入式控制系统的设计

在对Mecanum轮移动小车进行运动学分析的基础上,设计了一种基于模糊PID算法的全方位移动小车嵌入式控制系统．其中,上位机控制软件用 VB．NET 编写,通过蓝牙方式无线操控小车的运动．小车控制系统以高性能单片机STM32F103ZE为核心控制器,采用了模糊自整定PID控制算法,实现了Mecanum轮转速的闭环控制．通过实验对小车运行的稳定性、重复性等进行了测试分析．运行结果表明,所建立的小车运动学模型合理,控制系统运行可靠,模糊自整定PID算法的实时性及其控制精度可满足工程化应用的要求．     

Differential fault analysis and meet-in-the-middle attack on the block cipher KATAN32

We investigate the lightweight block cipher KATAN family which consists of three variants with 32, 48 and 64-bit block sizes, called KATAN32, KATAN48 and KATAN64 respectively. However, three variants all have the same key length of 80 bits. On the basis of the bit-oriented faulty model and the differential analysis principle, we describe the attack that combines differential fault attack with the meet-in-the-middle (MITM) attack on the KATAN32. More precisely, inducing a fault at a bit, we can recover some linear differential fault equations on the key bits. During solving equations, without the help of computer, we need only algebraic deduction to obtain relations of some key bits. The complexity in this process is neglectable. The secret key of the full cipher can be recovered faster than exhaustive search for all three block sizes in the KATAN family. Our result describes that KATAN32 is vulnerable.     

基于模糊聚类的城市快速路交通流状态划分

针对城市快速路交通流状态分类的问题,提出了一种改进的模糊C均值(FCM)算法.结合层次聚类算法和FCM聚类算法,运用层次聚类算法得到最佳聚类数和初始聚类中心,并通过Relief F特征加权对影响交通状态的不同特征指标赋予相应的权值,最终用FCM算法再次聚类得出交通流状态的分类结果.以VISSIM为工具,对该方法进行了模拟.对比分析结果显示,所提出的方法能够提高城市快速路交通流状态分类的效果.     

Improvement the electrochemical performance of Li1.2Ni0.2Mn0.6O2 electrode with AlF3 added

Layered solid solution material Li_1.2Ni_0.2Mn_0.6O₂ is synthesized and the AlF₃ is added to improve the electrochemical performance. X-ray diffraction (XRD) results show that the Li_1.2Ni_0.2Mn_0.6O₂ samples exhibit layered characteristics. The AlF₃ additive is detected by transmission electron microscope (TEM) technology. The electrochemical tests show that Li_1.2Ni_0.2Mn_0.6O₂ electrode with AlF₃ added delivers better discharge capacity (240mA· h/g), first coulomb efficiency 79.2%, cyclic performance (capacity retention ratio of 100.6% after 50 cycles), and rate capacity (68mA · h/g at 10 capacity (C)) than the pristine sample. Electrochemical impedance spectroscopy (EIS) results show that the charge transfer resistance of Li_1.2Ni_0.2Mn_0.6O₂ electrode with AlF₃ added increases slower than that of pristine Li_1.2Ni_0.2Mn_0.6O₂ after cycling, which is responsible for better cyclic and rate performance.     

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影响城市交通出行方式选择的因素有很多,本文致力于分析具有随机特性的因素对出行方式选择的影响程度,即随机弹性.使用具有较好收敛性的集计交通战略STM模型作为分析出行方式选择的工具,并根据对道路实测数据的统计分析,验证了作为影响出行方式选择的重要因素——小汽车出行速度为随机变量并服从k阶爱尔朗分布.根据经济学的随机弹性理论,推导出小汽车出行速度对出行方式选择的随机弹性计算模型,利用北京市的实际数据验证了模型的有效性.并得出结论：交通政策指标（影响因素）的可靠度越高,政策目标对政策指标的弹性值越稳定、集中,即政策目标达到的可靠度越高,随机弹性分析模型可作为一种交通政策量化分析的工具.     

排水性沥青混合料空隙率与连通空隙率相关性研究

排水性沥青混凝土路面的重要特点就是空隙率比一般沥青混合料都要高,研究表明：排水性沥青混合料空隙率越大,路面结构内部的连通空隙就越多,且空隙率与连通空隙率具有一定的相关性。     

Capillary electrophoresis with inhibited electrochemiluminescent detection for the trace analysis of epinephrine and dopamine

In this paper, a novel electrochemiluminescent (ECL) detection approach was developed for highly sensitive detection of ECL inhibitors based on the ECL inhibition of Ru(bpy)32+/2-(Dibutylamino)ethanol (DBAE) system. A microfluidic ECL detection cell was fabricated to couple with the capillary electrophoresis system, the electrochemical system and the postcolumn injection system. Both Ru(bpy)32+ and DBAE solutions were injected directly to the working electrode surface by a micro-infusion system to obtain a high and stable ECL signal. The performance of this setup was demonstrated by the analysis of two typical ECL inhibitors, dopamine and epinephrine. Under the optimal conditions, the limit of detection (LOD) for dopamine and epinephrine was 50nM and 5nM respectively. The proposed method was also successfully used for the trace analysis of dopamine and epinephrine in human serum samples.     

F3000车型总装配线工艺改造

通过对总装配线现状和F3000车型的主要结构特征进行分析,从工艺流程、设备、工装等方面对总装配线进行改造,实现F3000车型批量装配的目标。     

煤层气发动机电控单元的CAN总线设计

为便于发动机电控系统更好地融入到整车通讯控制体系中,文章采用PIC18F448型单片机和PCA82C250型芯片,以原有煤层气发动机电控系统为模板,对集成式的CAN总线通讯模块进行了研究,完成了硬件电路和程序的设计;数据收发包括标准帧和扩展帧,均采用中断控制方式实现。指出该CAN模块可作为一个独立的CAN节点使用,为煤层气发动机ECU融入整车控制ECU的通讯体系奠定了基础。