组态王与PLC控制的交流闭环变频调速系统

由PC、PLC、变频器和轴编码器构建交流闭环变频调速系统:PLC运用PID闭环控制变频调速,PC基于组态软件实现远程监控。采用PC和PLC构成上、下位机联合控制,可实现工业级的控制可靠且监控便利的综合自动化系统。     

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。     

基于WinCC6．0及ABPLC的可控硅整流监控系统

介绍一种应用于大电流整流系统的动态计算机监控系统,该系统以上位机的西门子WinCC6．0和下位机的ABSLC5／04系列PLC为核心进行动态监控。论述监控系统中上位机软件的设计与实现,以及人机界面动画的制作．介绍了上位机与下位机PLC的通信方式,阐述了镍、铜大电流整流系统的结构和特点。     

热电厂水处理监控系统的设计与实现

设计了以工控机为上位机、PLC为下位机的某热电厂水处理监控系统.详细分析了基于WinCC的上位机监控系统的设计思路,叙述了通过监控软件实现水处理监控的方法.     

基于PLC的火电厂输煤程控系统

在分析火电厂输煤程控系统工艺流程和控制需求的基础上,针对输煤系统的特点给出了以S7-300 PLC为系统主站、S7-200 PLC为远程从站,并利用MCGS组态软件在上位机进行实时监测的控制方案。主要由卸煤、堆煤、上煤和配煤部分组成的输煤控制系统,利用上位机组态软件和下位机PLC实现了对整个输煤程控系统运行状况的监控。     

基于工业组态软件WinCC的化工工业监控系统

介绍一种应用于化工厂的动态计算机监控系统,该系统以上位机的西门子WinCC5.1和下位机的西门子S7-300系列PLC为核心进行动态监视与控制.详细论述了监控系统中上位机软件的设计与实现,以及人机界面动画的制作,介绍了上位机与下位机PLC的通讯方式.概述了丁酯合成与回收系统的结构和特点.     

基于PLC的给料分拣自控系统

设计了一种基于PLC的物料分拣自控系统,实现了对不同物料的自动分拣。利用下位机STEP7-300进行程序的编程和对组态监控系统配置的设计。同时利用上位机WinCC对下位机进行监控。仿真结果表明：该系统分拣操作准确性高、操作稳定且易于控制。     

膜法油气回收装置控制系统的设计

针对膜法油气（及化学品）回收装置的运行特点,采用PLC为下位机、嵌入式工控机为上位机的控制结构,实现了对油气回收运行系统的自动控制、现场及远程监控（如图1）。采用WINCC组态软件开发的现场和监控软件,能实现过程参数的实时显示和历史数据处理等功能。运行试验结果表明,该装置能使在装车过程中的挥发油气大量回收,油气排放浓度降至20g/m3。     

SCADA系统在公路隧道电力监控中的应用

以秦岭终南山公路隧道的电力设施监控为例,以SCADA软件作为系统的主监控软件,设计了完整的系统解决方案。重点论述了该系统的体系结构、系统的上位机和下位机配置以及整个系统的功能和特点。     

基于专家分段PID注塑机远程监控系统设计

针对注塑机料筒温度控制存在超调、震荡和自动化监控水平低的问题,设计一套基于专家分段PID的注塑机远程监控系统。利用专家知识和经验,设计PID参数分段规则库,实现PID控制器参数的在线整定。以Siemens CPU315–2PN/DP控制器和ET200S从站为核心,以Step7+WinCC平台开发监控系统下位机程序和上位机HMI界面,实现生产报表、故障诊断及历史趋势功能;搭建了车间环形光纤工业以太网,实现了资源整合、数据共享,完成了注塑机自动监控系统的升级。MATLAB仿真和现场验证表明,专家分段PID控制器超调量小、抗干扰能力强、鲁棒性好,能够提升塑件质量。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。