冻融循环下云母石英片岩三轴力学特性与强度预测模型

为探究云母石英片岩物理力学特性受冻融循环作用的影响,对饱水云母石英片岩开展了0、25、50、75、100次冻融循环试验,并对试样分别进行了4级围压下的常规三轴压缩试验,研究了其动弹性参数、三轴压缩破坏形式及三轴抗压强度的变化规律,取得如下成果:①随着冻融循环次数的增加,三轴抗压强度、动弹性模量、动剪切模量及动体积模量呈指数衰减,黏聚力及内摩擦角则呈线性衰减趋势;②随着冻融循环的进行,围压对试样强度的增大作用逐渐削弱,冻融循环对试样强度的劣化作用逐渐凸显;③冻融作用使云母石英片岩三轴压缩破坏形态由张拉破坏逐步演化为顺片理剪切破坏;④基于Jaeger破坏准则建立了一种以冻融循环次数、片理面倾角及围压为控制参数的斜交片理云母石英片岩三轴抗压强度预测模型,预测结果与实测数据具有较好的一致性。研究成果可为研究云母石英片岩冻融损伤劣化规律提供参考。     

Differential Evolution Algorithm Based Self-adaptive Control Strategy for Fed-batch Cultivation of Yeast

In the fed-batch cultivation of Saccharomyces cerevisiae, excessive glucose addition leads to increased ethanol accumulation, which will reduce the efficiency of glucose utilization and inhibit product synthesis. Insufficient glucose addition limits cell growth. To properly regulate glucose feed, a different evolution algorithm based on self-adaptive control strategy was proposed, consisting of three modules (PID, system identification and parameter optimization). Performance of the proposed and conventional PID controllers was validated and compared in simulated and experimental cultivations. In the simulation, cultivation with the self-adaptive control strategy had a more stable glucose feed rate and concentration, more stable ethanol concentration around the set-point (1.0 g•L^-1), and final biomass concentration of 34.5 g-DCW•L^-1, 29.2% higher than that with a conventional PID control strategy. In the experiment, the cultivation with the self-adaptive control strategy also had more stable glucose and ethanol concentrations, as well as a final biomass concentration that was 37.4% higher than that using the conventional strategy.     

中置式高压电容器柜改进设计

分析了南屯煤矿白马河风井变电所高压电容器柜原设计方案存在的问题,并对其进行了改进设计:选用适用于容性负载的真空断路器;添加放电线圈,并将放电线圈与电容器直接并联,使放电线圈与电容器组成一个完整的放电回路;添加接地开关,接地开关既有机械闭锁又有电气联锁,操作方便,安全性高。实际应用表明,改进设计后的高压电容器柜功能更加完善,更加安全、可靠。     

基于WebGIS和3G的警务指挥调度系统研究与设计

该文针对公安系统的实际需求设计了一个基于WebGIS和3G的警务指挥调度系统。论文首先介绍了警务指挥调度系统的设计思路和总体架构,然后分析了Android开发平台和J2EE开发架构的优点,最后完成了移动终端和中心平台的软件设计并对其实现方法进行了研究。     

基于ENC424J600的以太网与串行接口转换技术

论述了在STM32系列的MCU上移植TCP/IP协议栈LwIP,并利用新型以太网控制器ENC424J600实现网络数据传输功能。该系统主要完成的功能是接收上位机发送的数据,并将这些数据转换成通用串行接口输出。ENC424J600是Microchip新推出的一款以太网控制器,其速度优于ENC28J60,同时为用户提供两种接口模式。本文介绍了其基于SPI接口模式下的实现过程,详细描述了该网卡驱动的硬件电路和软件流程。     

A fuzzy cerebellar model articulation controller based visual servo system for robot

This paper presents a novel online learning visual servo controller integrating the FCMAC with proportion controller for the control of position of manipulator end-effector. Since the FCMAC has good learning capability and fast learning speed, and can save much computer memory space by fuzzy processing of input space division and memory unit activation, it is used to develop an adaptive control law by learning the relationship between the image feature errors and manipulator input, and the aim of online learning of the FCMAC is to minimize the output of proportion controller. Furthermore, the FCMAC has no need for models of robot manipulator and image feature extraction, so that the capability of proposed controller for tasks under uncertain environment can be improved. Finally, the proposed controller is proved to be effective by the experiment, and compared with BP neural network.     

Improved stability conditions for systems with interval time-varying delay

The paper is concerned with the stability of linear systems with interval time-varying delay. Through constructing a new augmented Lyapunov-Krasovskii functional (LKF) which contains some quadruple-integral terms and estimating the time derivative of the LKF less conservatively, new stability criteria are derived without introducing any free matrices. Moreover, by proving the positive definiteness of the LKF with some integral inequalities, the constraints on some functional parameters are relaxed and the conservatism of the obtained results are further reduced. Numerical examples are also given to demonstrate the effectiveness and reduced conservatism of the obtained results.     

基于内容的静态语义概念视频检索方法研究

本文针对互联网视频检索技术的发展,阐述了目前主流视频搜索引擎的技术现状,分析了互联网视频检索的关键技术,特别是对于视频特征的提取技术。本文的创新点是提出了一种通用的基于内容的静态语义视频检索方法,该方法可以弥补基于文本视频检索的有关不足,并且在TRECVID的视频概念检索数据的静态语义概念中得到验证,运行稳定。     

信息融合技术在变压器油气识别故障诊断中的研究

变压器故障分为放电性故障和过热性故障两大类别,它们均会在变压器油中有所反映。本文通过对变压器油中主要气体的分析,判断变压器的故障类型。具体方法是:利用改进算法的BP网络和信息融合技术,以变压器油中五种主要特征气体作为神经网络的输入,以六种变压器状态作为相应的输出,通过加入动量因子,可以提高学习率系数,充分发挥改进算法的BP网络具有自适应学习能力的优势。仿真测试结果表明,本方法能够在较大范围内准确有效地进行变压器的故障诊断。     

热轧态Si—Mn系双相钢的组织转变

利用Ｇｌｅｅｂｌｅ－１５００热模拟试验机对试验钢进行了热模拟轧制。研究了在不同热轧工艺参数与合金化程度条件下Ｓｉ－Ｍｎ双相钢的组织转变。获得了估算热轧态Ｓｉ－Ｍｎ双相钢马氏体体积百分数和先共翁素体体积百分数的计算式。计算值与实测值相吻合，给出了ｆｍ－Ｔ－Ｖ和ｆＦｐ－Ｔ－Ｖ关系的三维图及相应的ｆＭ和ｆＦｐ等值线图。