基于RFID和GPRS的远程监控系统设计与实现

针对目前监控系统监测点分散、数量大、信息统计难的问题,提出了一种基于射频识别(RFID)技术和GPRS技术的远程监控系统,进行了系统的总体设计,给出了详细的手持读写器硬件和软件设计,主要包括射频读写模块、GPRS模块、主控制器模块等。射频读写模块采集数据后,通过GPRS模块将数据上传至上位机进行分类管理,实现了监控系统自动化,提高了管理效率。整个系统采用锂电池供电,成本低,使用方便,安全可靠。     

凝固过程微观组织模拟研究进展

综述了凝固过程微观组织模拟的研究现状,重点介绍了微观组织演变过程中晶粒形核、长大、相关的理论模型和常用的数值模拟方法,并对微观组织模拟的未来发展进行了评价和展望.     

DSM系统中共享存储抽象机制的实现

虽然ＤＳＭ系统相互之间差异很大，但ＤＳＭ存在一个共同特征，即提供共享存储抽象机制。本文分析了ＤＳＭ系统共享存储抽象机制的实现，总结了各种不同的实现途径、实现细节及各自的优缺点，指出了ＤＳＭ发展的趋势及一些亟待解决的问题。     

Using rotary contact method for 5-axis convex sculptured surfaces machining

The 5-axis tool positioning strategy named rotary contact method (RCM) for sculptured surfaces machining has been developed in our previous paper (Wengang Fan et al., J Manuf Sci E-T ASME 134(2):021004.1-021004.6, 2012). The RCM finds the optimal tool positions by rotating the tool backward based on the offset surface instead of the design surface, and can generate big machined strip width without gouging. However, the RCM only deals with concave sculptured surfaces machining well at present, and the special property of convex sculptured surfaces machining has not been fully exploited. To resolve this problem, the general convex sculptured surfaces machining using the RCM is implemented in this paper. Firstly, the tool position error distribution for different tool feed directions is deeply investigated. It is concluded that the best tool feed direction is collinear with the maximum direction of curvature, which is completely opposite to the case for concave sculptured surfaces machining. Then the relationship between the key parameters in the RCM and the tool position error distribution as well as the tool path generation is totally discussed. Finally, machining simulation and cutting experiment of a convex sculptured surface example are performed. The results show that the RCM can apparently raise the efficiency of manufacturing process by contrast with the algorithm in the software UG for convex sculptured surfaces machining.     

“微时代”的大学生思想政治教育创新研究

随着网络的迅速普及,各种各样的网络交流平台不断涌现,给人们及时交流提供了很大便利,而以微博为代表的微媒体就是这样网络化了的交流平台。微博等微媒体的快速发展已经成为网上信息传播、交流的不可忽视的力量,不仅成为人们之间信息共享的重要交际工具,同时对在校大学生的日常生活学习、思想、价值观等都产生着深刻影响。本文拟在探讨"微时代"下微博等微媒体对大学生思想政治教育带来的挑战和机遇的基础上,研究"微时代"下大学生思想政治教育的创新,以期为今后我国大学生思想政治教育的进一步提高提供一点有益借鉴。     

基于邻域粗糙集的大规模层次分类在线流特征选择

在分类学习任务中,数据的类标记空间存在层次化结构,特征空间伴随着未知性和演化性.因此,文中提出面向大规模层次分类学习的在线流特征选择框架.定义面向层次化结构数据的邻域粗糙模型,基于特征相关性进行重要特征动态选择.最后,基于特征冗余性进行鉴别冗余动态特征.实验验证文中算法的有效性.     

Fluid flow and heat transfer with nail dipping method in mould during continuous casting process

ABSTRACT

The character and cause of sliver defect on IF steel sheet surface are studied by means of SEM, unstable flow in mould could induce surface velocity and level fluctuations, leading to surface defects during continuous casting of steel. The nozzle clogging is a serious problem during the continuous casting of steel, due to its influence on the casting operations and products quality. In this study, the nail dipping method for measuring surface velocity and flow direction in molten steel were employed. The fluid flow in mould of whole casting sequence was investigated, especially during the nozzle clogging conditions. The results showed that when nozzle clogging occurred in the 7th heat, the flow velocities on R and L side of nozzle were 0.280 and 0.402?m/s, respectively. The surface defect ratio of hot-rolled and cold-rolled plates increases with the increase of heat flux deviation on both sides of the mould copper. The different clogging per cent on both sides of the nozzle will lead to asymmetry flow, the surface velocity is higher with the small clogging per cent side compared to that of relatively large per cent clogging side.     

昼夜节律睡眠-觉醒障碍与恶性肿瘤发生发展的关系

昼夜节律睡眠-觉醒障碍是指睡眠-觉醒周期与人体24 h生物节律失调所致的一类睡眠疾病,它可以影响人体的认知功能和代谢等过程,还能促进恶性肿瘤的发生发展——通过改变时钟基因表达直接促进肿瘤增殖,并通过抑制褪黑素的分泌等内分泌机制间接加速肿瘤发展。本文阐述了昼夜节律睡眠-觉醒障碍的定义、它导致的病理状态以及它对恶性肿瘤发生发展的影响,以期为昼夜节律性睡眠-觉醒障碍影响的肿瘤发生发展的防治提供可能的治疗措施。     

电信企业数据驱动存量营销发展策略

基于电信行业新增市场逐渐缩小,存量经营成为企业营销重点这一趋势,阐述了电信企业要实现数据驱动存量营销所需具备的条件以及目前尚存在的问题,并针对存量营销四大目标提出数据驱动存量营销发展策略建议:进行数据驱动存量营销IT系统的能力架构设计;梳理并建立电信企业存量营销运营管理流程;建立客户需求标签库和营销/策略资源库两个基础库;完善并建立需求资源配置、渠道触发和数据化管理三大存量营销核心能力.     

Design of parallel cyclones based on stability analysis

The uniform distribution of gas solids flow across parallel cyclones is required for high efficiency. In this study, we introduced mass flow rate ratio between solids and gas (C_T) to present multi‐phase interaction. And the direct Liapunov method is used to detect the instability of uniformity. Due to the special symmetry in this system, the criterion can be simplified into identifying the concavity (concave or convex) of pressure drop across a single cyclone with respect to C_T. Then, based on the stability analysis of uniformity, a novel design principle is provided to prevent non‐uniform distribution at dense phase. The effect of geometrical factor, i.e. dimensionless vortex finder diameter d_r, on the stability of uniformity has been further investigated. The phase diagram, illustrating the effects of both operational parameter (C_T) and geometrical parameter (d_r) on stability of uniformity is calculated to give a clue of designing a robust parallel cyclones system. © 2016 American Institute of Chemical Engineers AIChE J, 62: 4251–4258, 2016