基于FPGA的全自动故障诊断装置

设计了一种基于FPGA的全自动故障诊断装置,由FPGA提供多路指令信号和两路同步时钟信号。多路指令信号在被测设备中被编码后转换为串行数据输出,自动诊断装置在同步时钟作用下将接收到的串行数据转换为异步信号发送给上位机,上位机接收信号后对设备进行诊断。实测结果表明:该设备可全自动提供激励信号和诊断结果,有效提高了测试效率。     

基于VB的多路温度检测系统设计

为了实现温度的多点检测,采用传感器将温度数据转换为数字信号,以单片机为核心,读取并显示温度数据,同时采用RS485串行通信,使下位机测温模块与上位机实现双向通信,继而完成上/下位机的温度显示、报警及上位机报警控制等。上位机界面采用VB编写而成,作为系统中心,联络各下位机模块。由于RS458可以一对多双向远距离通信,多个下位机模块与上位机相连,实现常规温度（0～120℃）下的温度值多点远程监测。     

移动式压力容器安全监测系统的设计与实现

针对移动式压力容器储运过程中的安全问题,介绍了一种基于LabVIEW平台的安全监测系统。该系统采用89C52型单片机作为数据采集系统(下位机)的核心,利用RS485协议将数据上传并通过USB接口送至PC机(上位机),上位机监控系统运用图形化编程语言LabVIEW建立的虚拟仪器面板,完成数据显示、分析与处理。     

基于物联网的化工厂环境监测系统

基于物联网的化工厂环境监测系统,系统由数据采集模块、3G传输模块、上位机模块三部分组成。此化工厂环境监测系统的终端是以ARM微处理器为核心来控制底层采集模块,传感器将各类模拟信号采集完,通过A/D转换器,对模拟信号进行数字转换,处理编码并打包数据,数据被打包成适合于传输的IP包后,经3G模块对数据进行传输,移动通信服务的基站将数据传输到Internet网络,然后将数据连接到监测中心的局域网中,由上位机的数据接收程序接收并处理,最后数据被存入到服务器的数据表中。     

S7-300和S7-400系列PLC组合在双挤出内衬层生产线控制系统中的应用

介绍双挤出内衬层生产线的工艺流程和控制系统。该生产线控制系统采用S7-300和S7-400系列PLC组合进行3CPU组合控制,上位机采用Windows2000操作系统进行配方管理,可通过通讯卡与下位机通讯,进行设备状态显示和报警,为防止上位机故障影响生产,配方同时存于PLC的DB数据块中,并可用拨码开关进行选择。     

海上采油平台固频电潜泵控制系统的PLC改造

本次改造是针对海上采油平台旧的固频电潜泵控制系统进行,将原有的马达控制器替换为PLC控制。PLC与智能电力检测仪之间使用Modbus RTU协议通讯;PLC、触摸屏和上位机之间组成西门子PROFINET工业以太网;上位机通过双网卡之一连接到企业局域网,现场和远程均可实时监控电潜泵的各种运行参数。新系统可长期存储电潜泵运行参数,具有故障时数据记忆功能,有利于电潜泵运行数据的集中监视、分析及管理。     

简单数据监测技术在石墨化送电中的应用

采用压力传感器与位移传感器在石墨化送电中对电极的位移变化量及当前压力值进行实时测量,并将测得的变化状态数据经过PLC进行数据处理,最后将数据传给上位机,达到实时监测的目的。     

浮选矿浆pH值和温度的在线检测系统

分析了浮选生产工艺中对矿浆pH值和温度参数检测的特点，在此基础上，采用AST386为上位机，MCS－51系列单片机为下位机构造了一种集散型分布式检测系统。下位机控制仪表完成现场数据的实时采集和处理任务，上位机集中巡回监测各检测点的参数变化并进行各种管理操作。运行情况表明，该系统性能可靠、使用方便，并可推广应用于其它工业领域。     

基于LabVIEW的单片机与PC机串口通信显示系统设计

为了实现上位机与下位机通信,设计了基于Lab VIEW的单片机与PC机串口通信显示系统。系统的显示模块可直观地显示通信数据,并解决了串口通信与字符液晶显示时序冲突的问题。本系统可作为NI系列板卡的显示模块,具有实际工程应用价值。     

常压储罐表面形貌视觉检测机器人技术研究

为替代人工高空检测作业,基于线性激光传感器设计常压储罐表面形貌视觉检测机器人.机器人包括运动平台、上位机与激光扫描系统三大模块,通过上位机控制运动平台实现机器人的灵活移动,利用激光传感器和视频监控摄像头进行全方位扫描和监控,采用Python数据处理软件和Matlab软件将测量数据进行拼接,获得物体表面形貌三维图,实现对...     

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。