反射内存网在EAST极向场电源控制系统中的实现

核聚变装置EAST对极向场电源控制实时性要求特别高,必须在一个控制周期（1 ms）内完成对12套电源设备的通信、反馈控制、采集、测量等闭环控制环节的操作。介绍反射内存网的工作原理,选用VMIPCI-5565反射内存卡和VMIACC-5595网络集线器搭建了由10个节点构成的反射内存实时网络,并在QNX6.30实时操作系统下测试了反射内存网的实时性、延迟确定性和可靠性。EAST实验结果表明该网络完全满足极向场电源控制系统的实时要求。     

EAST极向场电源控制系统的EMC滤波设计与应用

滤波器是由电感、电容、电阻或铁氧体器件构成的频率选择性二端口网络,可以插入传输线中,抑制不需要的频率进行传播。结合电力电子系统电磁兼容理论和极向场电源的实际运行状况,对传导干扰和信号滤波的设计与应用进行介绍。     

零磁通霍尔电流传感器磁路仿真

在分析霍尔电流传感器磁路的基础上,推导出零磁通霍尔电流传感器的直流传递函数,并根据这个传递函数,运用ANSYS对该类传感器的磁路进行三维空间电磁场仿真,得到了磁场强度和磁感应强度矢量的仿真模型,与磁路模型和传感器电路模型的分析结果进行对比,该模型可用于闭环霍尔电流传感器对极向场电源系统±15kA双向直流大电流的检测.     

基于QNX的启动和终止远程进程方法的研究与实现

针对目前EAST极向场电源控制系统操作方式所存在的问题，通过对QNX的Photon micro GUI（微图形用户接口）的运行机理及QNX网络体系结构的分析，重点对如何利用spawn（）和PtTty控件启动和终止远程进程的方法进行了研究，通过对比分析，总结出一种既简便易行，又能可靠地启动和终止远程进程的方法。     

喷雾抑尘系统在水泥行业上的应用

解决水泥企业扬尘污染问题是水泥企业实现文明生产、绿色生产的关键。基于PLC喷雾抑尘控制系统,通过工业以太网,远程实时控制现场各作业点喷雾抑尘系统,实现喷雾抑尘系统远程集中控制,实现作业场地降温、降尘、加湿,有效解决水泥企业料棚现场粉尘治理。文章对喷雾抑尘系统集中控制设计方案作了详细阐述。     

单层高速电渣堆焊技术研究

本文以SA387Gr22CL2为基层材料,采用进口的SOUDOTAPE 24.12.LNB焊带配RECORD EST129焊剂对单层高速带极电渣堆焊技术进行研究,通过一系列工艺试验,摸索出最佳的工艺参数和技术措施.单层高速带极电渣堆焊技术在国内鲜有研究,目前还未得到广泛推广.通过试验得知该技术对焊接设备的稳定性和电源容...     

基于STM32微控制器的无线水塔远程监控系统

针对目前农村集中供水实时监控自动化水平低下、人力成本较高和施工布线繁重的问题,提出基于STM32微控制器的无线水塔远程监控解决方案。根据方案进行了系统硬件和软件设计。系统以STM32F103RC微控制器作为下位机控制核心,通过Keil u Vision3集成开发环境,采用C语言设计了智能数据采集终端和智能网关MCU应用软件,实现了现场多个水塔水位信息的实时采集和水泵实时控制。整个系统采用PC机作为上位机监控中心,基于Lab VIEW 2012开发环境进行上位机监控中心数据管理软件开发,实现向下位机发送监控命令,同时对现场多个数据采集终端的采样数据进行存储、处理、显示及统计等功能。     

罗克韦尔双冗余集成控制系统在田庄选煤厂的应用

田庄选煤厂采用罗克韦尔双冗余PLC集成控制系统对选煤厂进行了改造,本系统选用了冗余电源、冗余控制器、冗余控制网的三层网络架构。实现信息层工业EtherNet、控制层ControlNet、设备层DeviceNet,多系统互联、综合信息管理。全厂设备实现可靠稳定的集中控制、闭锁运行,有效保证了选煤作业的正常运行。     

基于蚁群算法的消防应急照明和疏散指示系统的设计

蚁群算法是一种用来寻找优化路径的启发式全局优化算法,将其应用到消防应急照明和疏散指示系统中具有可行性。在消防应急照明控制器中使用蚁群算法,实现实时控制相关应急电源、配电装置和应急照明灯具和疏散指示标志,确保所选最佳逃生路径的安全开通。提供的配电系统设计和软件设计流程,及软件的测试分析和实验成果报告,实现了简单优良的人机交互图形界面系统结构,将“就近疏散”转变为“安全智能疏散”,实现监测与控制一体化。     

基于电源装备的电镀工艺过程控制系统

阐述了电镀工艺过程控制系统的研究现状和发展概况,介绍了电镀工艺条件对镀件质量的影响。提出了一个基于电源装备的电镀工艺参数控制系统。该系统主要由数字化电镀电源、上位机、现场控制器构成。实践表明,该系统可以实现能量的合理配置,达到节能增效的目的。     

PF系列反击式破碎机在水泥企业中的应用

南京凯盛设计开发了具有自主知识产权的新型PF系列反击式破碎机,应用于水泥企业的石灰石破碎,具有产量高、电耗低、出料粒度稳定、检修方便、维护工作量小、过铁能力强、液压在线自动控制等优点,部分性能达到甚至超过了国际先进水平。     

Novel in situ mucoadhesive gels based on Pluronic F127 and xyloglucan containing metronidazole for treatment of periodontal disease

Novel thermoresponsive in situ-forming hydrogels were prepared from co-solutions of Pluronic F127 (PF; triblock-copolymer of polyethylene oxide, polypropylene oxide and polyethylene oxide) and 0.1 wt% tamarind seed xyloglucan (0.1TSX). Based on test tube inversion method, co-solutions comprising 18 or 20 wt% PF and 0.1TSX (18PF/0.1TSX or 20PF/0.1TSX) gelled at 29 and 26 °C compared with 28 and 25 °C for equivalent concentration of PF solutions. DSC analyses indicated that 18PF/0.1TSX and 20PF/0.1TSX exhibited micellization temperatures of 15.5 and 14.9 °C, respectively, compared with 16.2 and 15.7 °C, respectively, for 18PF and 20PF. The lower micellization temperature but higher gel formation temperature suggests that 0.1TSX assists micelle formation but may interrupt order pack structure of micelle that is necessary for gelling. SEM revealed the cylindrical pore structure of lyophilized gels with diameters around 35 μm for 18PF, 20PF and 42 μm for 18PF/0.1TSX and approximately 78 μm for 20PF/0.1TSX. Extractables, released from PF/0.1TSX gels in phosphate buffered saline, did not reduce the viability of mouse osteoblast-like (MC3T3-E1) cells compared with the control, whereas those from PF gels were very cytotoxic with cell viability of 54–60% compared with the control. Therefore, the addition of 0.1TSX resulted in a significant decrease in cytotoxicity of PF. PF/0.1TSX gels exhibited improved mucoadhesive strength compared with PF gels and sustained the release of incorporated metronidazole antibacterial. These biocompatible systems which are in the liquid state before administration and undergo gelation in situ to form a gel at body temperature may, therefore, be injected into periodontal pockets to achieve sustained local delivery of antibacterials for the treatment of periodontitis.     

信息化在水泥厂电能管理方面的几点应用

以某水泥厂电能数字化管理平台应用为例,结合工厂生产及设备管理需求,对信息化在设备用电数据实时监控,功率因数管理、峰谷平电控制及电能考核等方面的应用及效果进行阐述.     

微波辅助离子液体测定环境中残留红霉素的研究

用微波辅助疏水性离子液体[Bmim]PF6萃取分离红霉素,考察了微波辐射功率、辐射时间、离子液体用量、pH值对红霉素萃取率的影响。结果表明,微波辅助离子液体萃取分离红霉素的最佳工艺条件为:在303.15 K的温度下,调节体系pH=6～7,微波辐射功率为210 W,采用间歇辐射的方式,单次辐射时间为20 s,辐射3次,离子液体的用量为3 g,萃取率为90.7%。同时,建立微波辅助离子液体富集分离分析牛奶中红霉素的方法,该方法的检出限为4μg/kg,线性范围在5～50μg/L,RSD=1.7。     

基于无差拍电压空间矢量控制的SVG仿真研究

提出一种静止无功发生器无功补偿的新方法——基于无差拍电压空间矢量控制.该方法通过瞬时无功功率理论的无功电流检测法实时检测无功电流,提高了系统响应速度.针对直接电流控制开关频率过高的不足,引入了电压空间矢量技术,分析了电压空间矢量在静止无功发生器中的应用原理.为了消除采样及计算等带来的延时,引入了无差拍控制技术.最后通过Matlab对控制方案做了系统仿真,将无差拍与电压空间矢量SVPWM相结合,分析实时的仿真波形,仿真结果验证了所选控制方案的有效性和可行性.     

Genetic Labeling of Cells Allows Identification and Tracking of Transgenic Platelets in Mice

Background: The use of knock-out mouse models is crucial to understand platelet activation and aggregation. Methods: Analysis of the global double fluorescent Cre reporter mouse mT/mG that has been crossbred with the megakaryocyte/platelet specific PF4-Cre mouse. Results: Platelets show bright mT (PF4-Cre negative) and mG (PF4-Cre positive) fluorescence. However, a small proportion of leukocytes was positive for mG fluorescence in PF4-Cre positive mice. In mT/mG;PF4-Cre mice, platelets, and megakaryocytes can be tracked by their specific fluorescence in blood smear, hematopoietic organs and upon thrombus formation. No differences in platelet activation and thrombus formation was observed between mT/mG;PF4-Cre positive and negative mice. Furthermore, hemostasis and in vivo thrombus formation was comparable between genotypes as analyzed by intravital microscopy. Transplantation studies revealed that bone marrow of mT/mG;PF4-Cre mice can be transferred to C57BL/6 mice. Conclusions: The mT/mG Cre reporter mouse is an appropriate model for real-time visualization of platelets, the analysis of cell morphology and the identification of non-recombined platelets. Thus, mT/mG;PF4-Cre mice are important for the analysis of platelet-specific knockout mice. However, a small proportion of leukocytes exhibit mG fluorescence. Therefore, the analysis of platelets beyond hemostasis and thrombosis should be critically evaluated when recombination of immune cells is increased.     

Wood Pulp Fiber Wrapped by Fish-Scale Graphene as Flexible and Free-Standing Supercapacitor Electrode

Poplar wood pulp was adopted as both frame and precursor for the synthesis of pulp fiber (PF)/reduced graphene oxide composite via a simple and low-cost method. In this method, the PF based on graphene (PFG) composite film electrode was prepared by a simple vacuum filtration process with various ratios (PF: reduced graphene oxide (RGO)?=?5:1, PF:RGO?=?5:2, PF:RGO?=?5:3, PF:RGO?=?5:4, PF:RGO?=?5:5). In terms of special structures, the PFG can be used as electrodes without metal-collector, adhesives, and additives. The optimal ratio (PF:RGO?=?5:4) film electrode displayed a high areal-specific capacitance of 683 mF/cm² at 1?mA/cm² with a mass of 5.3?mg/cm² (specific capacitance of 129?F/g) and good cycling stability (87.5% capacitance retention after 10,000 cycles at 5?mA/cm²) as well as excellent rate capability and high flexibility (suitable for any angle, even 180°). Moreover, the device could possess a maximum energy density of 47.71?μWh/cm² and a maximum power density of 1251?μW/cm². These results suggest that the composite PGF film is a promising electrode material.     

Eucalyptus bark lignin substituted phenol formaldehyde adhesives: A study on optimization of reaction parameters and characterization

The major adhesive resin worldwide used in the manufacture of plywood is phenol formaldehyde resole (PF) resin. The raw material for this kind of adhesive is derived from petroleum oil. Because of rising prices of crude oil and the scarcity of petroleum products, their replacement by natural resource–based raw material has become a necessity. In the present work, the possibility of replacing phenol in PF resin with lignin was explored. The parameters for preparation of bark lignin substituted PF (LPF) adhesive, such as lignin concentration, formaldehyde to phenol molar ratio, catalyst concentration, reaction time, and reaction temperature, were optimized. It was found that up to 50 wt % of phenol can be substituted by lignin to give an LPF adhesive with better bonding strength compared to that of control PF resin. Prepared resins were characterized using IR, DSC, and TGA. IR spectra of LPF adhesive showed structural similarity with that of PF adhesives. Thermal stability of LPF adhesive was found to be lower compared to that of control PF (CPF) adhesive. DSC studies revealed a lower curing temperature for LPF resin than that for CPF resin. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3514–3523, 2004     

Properties of flowable sand concretes reinforced by polypropylene fibers

This paper presents an experimental research on fresh and hardened properties of flowable sand concretes (FSC) reinforced by polypropylene fibers (PF). Tests were conducted on both plain and fiber-reinforced FSC. The fresh properties are tested for viscosity using a programmable DV-II?+?viscometer. For the physical and mechanical properties, drying shrinkage, flexural, and compressive strengths, as well as micro-structural analyses have been studied. Results indicate that all studied mixtures have a pseudo-plastic behavior in fresh state and can be well fitted using power law model. Results also confirmed that PF incorporation increases the viscosity and reduces free shrinkage of FSC. In terms of mechanical strength, results show that incorporating PF would enhance flexural strength. However, a reduction in compressive strength is observed.