基于FPGA的CAN总线网络故障检测修复系统研究

提出了一种新型的基于现场可编程门阵列多处理系统芯片的智能电子控制单元,该控制单元兼容CAN总线协议,通过对CAN总线网络出现的故障进行实时检测和分析,实现故障隔离,提高CAN总线网络的安全性和可靠性。     

CAN总线的冗余方法在MMB系统上的研究与设计

基于MMB系统提出CAN总线的冗余设计,包括硬件和软件设计方案,实现CAN总线的监控、自动换线、检测等功能。     

基于CAN总线和ZigBee的矿井瓦斯监测系统设计

针对目前煤矿瓦斯监控系统信号传输的弊端,提出一种新型煤矿井下瓦斯气体浓度监测无线网络的设计方法.系统主要包括ZigBee便携式采集终端和CAN通信节点.便携式采集终端具有显示瓦斯气体浓度和报警功能,并将信息通过ZigBee无线网络传输给CAN总线,最终将信息传给井上监控中心,实现对全矿的瓦斯实时监测.     

基于STM32的分布式烟温探测器设计

以STM32控制器为任务控制与数据处理核心,根据烟雾粒子对光线的吸收和散射原理,通过光敏元件检测烟雾浓度,通过DS18B20检测温度,设计了烟温探测器。该烟温探测器具有CAN总线接口,作为智能节点分布于远程测控系统中。还介绍了CAN总线收发电路和RS232收发电路。经过测试:该烟温探测器工作可靠、灵敏度高,具有实用价值。     

基于ARM的智能仪表系统的设计

介绍了一种基于Cortex-m3核的ARM STM32F103RC芯片的智能仪表系统。系统采用了微控制器模块及其外围模块而构建的嵌入式智能仪表系统的模块设计方法,其中包括8路模拟量输入（涉及ADC）、4路数字量输入和4路模拟量输出（涉及DAC）、2路数字量输出,还有CAN控制器部分。目的是完成与现场之间数据信息的传输、数据处理以及通过CAN总线与上位机通信等任务。本文设计重点突出其通用性强、高性能、高可靠性、低成本的优势。     

CAN总线技术在船舶监控系统的应用

介绍基于CAN总线的船舶监控系统的基本结构。重点论述智能测控单元CAN通讯接口设计、CAN控制器外围硬件电路和CAN通信软件的实现。     

检测陶瓷墙地砖误差的计算机系统的设计

本文介绍了对陶瓷墙地砖综合误差进行测量的电子检测系统的设计,阐述了其系统组成、检测原理和数据处理等方面。这种检测系统对于提高瓷砖误差检测的准确性和效率具有实际意义。     

基于射频识别技术的电力设备规约检测系统

为解决电力设备因通信规约异构而导致的互联互通障碍和数据孤岛问题,提出一种基于无线射频识别(RFID)技术的电力设备规约检测系统设计方案,融合规约信息和设备信息形成电子产品编码(EPC),然后将编码写入RFID电子标签中,再建立一个规约检测数据库,通过对电子标签的自动识别和编码查询,使得设备与应用服务器建立起相应规约的通信连接,实现对规约的分析和检测,并着重对系统的工作原理、总体框架、编码方案和规约检测数据库进行了设计和分析。利用该系统设计方案,能使设备和应用服务器间的通信连接更自动化,适应智能电网的发展趋势,为电力规约通信研究提供参考。     

基于STM32的CO气体便携检测装置设计

在汽车驾驶室等含有CO气体环境中对其CO浓度的实时监测具有重要的意义。本文提出一种便携式基于实时监测的CO气体检测装置。构建了检测装置的系统框架,选定了STM32F103作为主控芯片,设计了CO化学传感器、CAN通信模块以及无线传输模块调理电路,并设计了软件系统。该系统采用嵌入式的设计,结构简单、可靠性高、便于携带,具有一定的应用意义。     

振动监测系统中CAN总线通信模块设计

介绍一种基于CAN总线的振动数据采集监测系统,重点介绍其CAN总线通信模块的设计.对该振动监测系统的整体结构,通信模块的硬件配置和软件实现思路均作了详细地说明,并将设计中重点需要注意的事项也作了介绍,可供同样正在从事CAN总线系统开发的同行们交流使用.实验表明,该装置具有结构简单、可靠性高的特点.     

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。