基于Profibus-DP总线分析器的高速数据采集系统

提出了一种基于Profibus-DP总线分析器的高速数据采集系统实现方案。采用FPGA定制化的通信控制器来实现分析器的功能需求和实时性要求,设计了数据采集系统的硬件电路,并给出了软件的总体设计流程。实验测试结果表明,系统结构灵活,抗干扰能力强,能够很好地完成高速数据采集系统的要求。     

便携式高精度注塑机数据采集系统的设计与实现

介绍了一种高精度的实时注塑机数据采集系统的设计结构与实现方法。该系统基于USB型高速数据采集卡和笔记本电脑硬件平台,采用了多线程、多媒体计数器等技术将数据采样精度从以前的20ms提高到了1ms。同以往的采集系统相比,该系统具有采集精度高、速度快、能大批量数据采集、使用方便等优点。     

基于VFC的过程参数信息采集系统设计

由LM331、80C51单片机及其他外围器件组成数据采集系统,对多路过程参数进行信息采集,不仅能提高系统的抗干扰能力,还可灵活提高数据采集的精度。讨论了ADC对信息采集系统的影响后,对基于VFC的数据采集系统的硬件结构、数据采集控制程序进行设计,系统具有良好的通用性和扩展性,应用范围广泛。     

二甲基二烯丙基氯化铵共聚物合成条件对其絮凝特性的影响

通过改变二甲基二烯丙基氯化铵(DMDAAC)与丙烯酰胺(AM)共聚反应的原料投加比、反应时间、反应温度及引发剂用量,制得不同性状的共聚产物(PDA),使用高岭土悬浊液对产物絮凝性能进行了考查。结果表明:在0.07%的过硫酸钠引发下,50℃条件下反应4h得到的共聚物PDA絮凝除浊性能最佳;同等用量的PDA比二甲基二烯丙基氯化铵均聚物(PDMDAAC)具有更优的絮凝除浊效果;PDA与无机絮凝剂硫酸铝联合使用时,硫酸铝可显著提升PDA的絮凝除浊效果。本研究有利于系统认识DMDAAC型有机高分子材料的混凝特性,为其在水处理工程中的应用提供理论依据。     

基于ZigBee与Android平台的功图量油系统

针对油田边远井不便使用原有功图量油系统的情况设计手持自动化量油系统。该系统采用ZigBee芯片JN5139、加速度传感器ADXL202和载荷传感器INA122U作为网络平台,设计了数据采集处理系统;采用Android 2.2平台开发数据采集、传输软件。将ZigBee网络以及Android 2.2平台的GPRS与蓝牙模块融合应用于系统无线传输方案的设计中,实现了功图量油系统的数据采集和远程数据传输。     

基于PDA的玻璃纤维产品仓存系统的设计与实现

深入分析了玻璃纤维产品的出入库业务流程特点,详细介绍了该应用系统的开发过程、系统整体设计思路,重点介绍了PDA程序开发过程中用到的开发工具以及重点模块的使用和特点。     

电网调度自动化主站系统数据采集改进方案

本文主要以郑州电网调度自动化主站系统为背景,介绍调度自动化系统数据采集现状,提出采用新技术新方法改变原有的数据采集模式,以提高数据采集效率和可靠性。     

铜表面聚多巴胺辅助功能化防腐涂层的构建及性能

为了提高金属铜在中性盐环境中的耐腐蚀性,采用聚多巴胺（PDA）辅助共沉积法构建了高性能防腐涂层。通过引入聚乙烯亚胺（PEI）促进多巴胺单体（DA）的交联聚合,并利用 8-羟基喹啉（8-HQ）缓蚀剂强化涂层防腐稳定性。采用衰减全反射傅立叶变换红外光谱（ATR-FTIR）、扫描电子显微镜（SEM）和电化学测试系统探究了不同种类PDA基涂层及不同DA/PEI比例的 PDA/PEI/8-HQ复合涂层成分、形貌和耐腐蚀性,并剖析了涂层的防腐机理。结果表明：DA与 PEI浓度比为1∶1时,结构致密的 PDA/PEI/8-HQ涂层可充分发挥 PDA、PEI与 8-HQ缓蚀剂的协同作用,涂层体系自腐蚀电流密度低至 0. 48 μA/cm²,并可对铜提供稳定、优异的腐蚀防护作用。     

基于PDA的便携式工程装备维修器材移动管理系统的设计

从设计的角度阐述了基于PDA的工程装备维修器材移动管理系统的开发.介绍了系统的开发流程,并且具体说明了条码开发的关键技术.     

数据采集系统的干扰分析及对策

介绍数据采集系统，分析了干扰数据采集的原因，提出对策性措施并做了改进。     

Simultaneous multiwavelength study of the reaction of phenolphthalein with sodium hydroxide

A photodiode array (PDA) spectrophotometer was used to study the fading reaction of phenolpthalein in dilute sodium hydroxide solution. The principal component analysis (PCA) method was employed to identify the number of light absorbing species in the kinetics system. The target factor analysis (TFA) procedure, coupled with the Broyden-Fletcher-Goldfard-Shanno (BFGS) optimization method, was applied to the observed data to deduce the rate constants and the concentration-time profile of the reaction. The internal referencing method was shown to be essential in improving the quality of data obtained by a single beam PDA spectrophotomer.     

Nonaqueous lithium/pyromellitic dianhydride cell

The new lithium/1 M LiClO₄ propylene carbonate/pyromellitic dianhydride (PDA) cell and the improved Li/PDA cell are presented. The Li/PDA cell system has an open circuit voltage of 3.1–3.2 V, and 0.246 Ah g^?1 theoretical capacity, which is based on two-electron transfer. When the pyromellitic acid (PA), which is insoluble in the electrolyte, is added in PDA cathode as proton donor, the specific capacity is roughly two times than that of PDA. The cathode of such improved Li/PDA cell consists of 42 wt% of PDA, 18 wt% of PA and 40 wt% of acetylene black. Such improved Li/PDA cell has about 1300 Wh kg^?1 of energy density.The cell performance of the improved Li/PDA cell is examined, and the self-discharge test is also done and proved the capacity loss to be negligible during two weeks of storage in spite of the solubility of PDA (0.07 mol l^?1) in an electrolyte solution.     

Gleichzeitige Erfassung von Partikelmerkmalen und Eigenschaften mehrphasiger Strömungen mit Hilfe der Phasen-Doppler-Anemometrie

While conventional phase-Doppler anemometry (PDA) is already widely used for nonintrusive and simultaneous particle sizing and particle velocity measurements as well as for particle flux measurements in two phase and multiphase flows, there is a lack of knowledge surrounding the additional potential of PDA for particle material recognition and for concentration as well as temperature measurements on the base of rainbow angle displacements, for particle shape diagnosis and – if PDA extensions are used – for submicron sizing. This potential makes PDA most attractive to chemical enginering, i. e. to industrial processing and to research and development. Evaluation of recent PDA literature trends and procedures for setup optimisation as well as for raw data processing will be discussed.     

基于PDA的控制系统无线移动监控软件开发

基于WiFi无线网络和PDA设备,在常规DCS中开发了基于Windows Mobile的手持式无线移动监控软件。结合现场设备调校、数据移动监控等应用需求,设计了符合控制系统网络协议和基于无线通讯的WindowsMobile软件结构,开发了基于PDA手持式设备的各种实时监控功能,如数据记录、棒状显示、过程趋势、流程图等。该解决方案在国产WebField ECS-100控制系统上进行了应用测试,结果表明具有较好的实时性和可用性,为现场工程师进行系统调试提供了便利,有效地提高工业现场调试与维护的效率。     

钴离子掺杂聚多巴胺/聚苯乙烯复合材料

为实现多巴胺的高效聚合,将Co~(2+)引入多巴胺反应体系中,Co~(2+)的催化作用实现了多巴胺的快速聚合。在聚苯乙烯(PS)微球上黏附聚多巴胺(PDA),与不加金属离子的反应相比,当添加的CoCl_2·6H_2O对多巴胺的物质的量分数为40%时,得到相同PDA含量的复合微球的反应时间可以从16 h缩短至1 h,并且复合微球中PDA以及Co含量随着CoCl_2·6H_2O添加量的增加以及反应时间的延长而增加。复合微球粉末经过热压得到的复合材料具有三维网络结构,Co~(2+)的加入使得PDA与PS具有更好的相容性。PDA·Co/PS复合材料的热性能和力学性能比PDA/PS有更多的提升。     

Preparation of 2,4-dichlorophenoxyacetic acid loaded on cysteamine-modified polydopamine and its release behaviors

With dopamine as the monomer, the model pesticide 2,4-dichlorophenoxyacetic acid (2,4D) was loaded on cysteamine (NHSH)-modified polydopamine (PDA) nanospheres [2,4-dichlorophenoxyacetic acid bound to cysteamine-modified polydopamine (2,4D–PDA–NHSH)] via the construction of amide bonds. We investigated the materials’ structure, adhesive capability, and release behaviors, especially the mechanism of the release processes. The results demonstrate that the materials were spherical in appearance and adhesive. 2,4D loaded on the PDA vehicle was amorphous in structure. The amide bond between PDA and 2,4D generated by NHSH not only enhanced the loading amount of PDA from 296.28 to 692.56 mg/g but also decreased the thermal stability from 291 to 230 °C. The 2,4D–PDA–NHSH showed no pH responsiveness, whereas the PDA system without NHSH modification exhibited pH sensitivity. A mechanism for the observed behaviors was suggested. First-order, logistic, Weibull, and Korsmeyer–Peppas models were applied to describe the release behaviors at different pH values. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47469.     

PDA/RGO复合材料对水中Fe（Ⅲ）的吸附行为

将多巴胺与氧化石墨烯纳米片层接枝复合制备了聚多巴胺/还原氧化石墨烯（PDA/RGO）复合材料,通过XRD、FTIR、FESEM和XPS等对该复合材料的结构和表面性质进行表征,并研究了其对水中Fe（Ⅲ）的吸附性能,考察了pH、吸附剂用量、吸附时间、Fe（Ⅲ）浓度和温度对其吸附性能的影响。结果表明：通过多巴胺与氧化石墨烯的仿生复合成功制备出具有优良吸附性能的PDA/RGO复合材料。pH为2,293 K时,该吸附材料对水中Fe（Ⅲ）的最大吸附量为59.1 mg·g^-1,其吸附等温线符合Freundlich方程,吸附动力学可用准二级动力学方程来描述。吸附热力学研究表明该复合材料对Fe（Ⅲ）的吸附过程为自发吸热过程,呈现非均质吸附特性。作为一种新型吸附材料,该复合材料在Fe（Ⅲ）等金属污染废水处理中将具有潜在的应用前景。     

Effect of ethanol on the color transition of the polydiacetylene vesicle of 10,12-pentacosadiynoic acid for butylamine detection

In this study, we estimated the color-transition behavior of a polydiacetylene (PDA) vesicle system for butylamine detection in an EtOH–water mixed solvent. The effect of the EtOH concentration in the vesicle system on the color transition of PDA was measured. 10,12-Pentacosadiynoic acid (PCDA) was used to form the PDA vesicle by sonication and photopolymerization. The results show that the vesicle formation of PCDA was accomplished with up to 13 wt % EtOH. As the concentration of EtOH increased from pure water (0 wt %) to 13 wt %, a larger size vesicle was formed, with the color transition occurring at a lower temperature and with a lower amount of butylamine. The color of the PDA vesicle solution started to change at 3 mM butylamine with pure water as the solvent and at 2.5 mM butylamine with 10 wt % EtOH. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47688.     

Investigation of the unsteady two-phase flow with small bubbles in a model bubble column using phase-Doppler anemometry

The unsteady two-phase flow of water laden with small air bubbles in a model bubble column is investigated experimentally. Phase-Doppler anemometry (PDA) is used for measuring the velocities of water and bubbles. The measured sizes of reflecting tracers in the water and of the air bubbles are used to discriminate between water and bubble data. The investigations are focussed on the unsteady behaviour of the flow and on the interaction between the two phases. The measurement of relative (slip) velocities between bubbles and water reveals information about the dynamic behaviour of the two-phase system under the action of buoyancy on the disperse phase. The evaluation of time series of bubble velocities yields insight into typical frequencies at which the flow fluctuates. It is shown that, at all locations in the flow field, the velocity probability density functions of bubbles and liquid can be described by two superimposed Gaussian functions. The bubbles belonging to the two Gaussians exhibit different slip velocities. The probability for the occurrence of bubble collisions is quantified on the basis of the PDA data.     

Improvements on electrical conductivity of the electrospun microfibers using the silver nanoparticles

Conductive electrospun polymer fibers have attracted a great deal of interest in recent years. This study describes the preparation of electrically conductive microfibers composed of polyethersulfone/polydopamine/silver nanoparticles (PES/PDA/Ag NPs). Ag NPs acted as conductive centers, while hydroxyl- and amino-rich functional groups and excellent adhesion properties of PDA served to connect the Ag NPs and PES microfibers. Fourier transform infrared spectroscopy and scanning electron microscopy (SEM) showed that PDA was firmly adhered to PES microfibers. PES/PDA microfibers absorbed considerable amounts of silver ion from AgNO₃ solution, resulting in Ag NPs. X-ray diffraction, X-ray photoelectron spectroscopy, and SEM data represented the successful formation of PES/PDA/Ag NPs microfibers. Microfibers with optimal conductivity were obtained using a solution of 2% AgNO₃ at pH 9 at 50 °C for 45 min. The electrical resistivity of our PES/PDA/Ag NPs microfibers was only 202 Ω/cm, much lower than that of regular PES microfibers (2.1 × 10⁹ Ω/cm). These results show that the PES/PDA/Ag NPs microfibers are suitable for use as conductive polymer fibers in electromagnetic shielding, and conductivity-sensing applications, and in flexible electronic devices and biosensors. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48788.