硫化机网络群控系统

对硫化机群采用分散控制-集中管理式中央监控系统.系统分底层网络和上层网络两部分.底层网络分二级控制,采集现场硫化机温度、压力等参数.上层网络用于对生产数据进行处理显示、打印报表等.各层控制系统实现相对独立,该系统运行多年,未发生异常现象.     

CAN网络控制系统网络时延分析及其控制

通过反复实验,捕获了大量由于CAN网络而引起的网络时延.通过对这些时延数据分析,归纳出基于CAN网络的网络时延统计特性.利用得到的网络时延统计特性,设计相应的控制系统.实验结果证明,在不同的网络负载下,网络控制系统设计需要采用不同的控制算法.尤其是在网络负载很重的情况下,现有的控制器设计已经不能保证系统的稳定性.     

一种简单的BP网络隐层扩展模型及其训练算法研究

为了提高神经网络的预测精度,设计一种动态扩展BP网络隐层的方法,在训练过的BP网络上动态增加一个具有线性激活函数的隐层,用改进的蚁群算法对新增权值进行训练,着重对算法的实现过程及算法分析进行论述.设计了算法改进前后用BP网络对催化剂活性进行预测的对比实验,结果表明,采用该模型及训练算法.可在不影响网络表达能力的基础上提高网络的训练精度及网络的泛化能力.     

基于GPFN网络的智能控制及其在碱回收炉中的应用

分析碱回收炉的控制难点和控制现状,提出运用GPFN网络来动态辨识碱回收炉的数学模型,并在线调整PID参数的控制方案,以提高系统的跟踪能力和抗干扰能力.在碱回收炉的控制中,以一、二次风量作为调节手段,把黑液固形物的流量和组分变化作为干扰,设计前馈控制器抵消这部分扰动,并根据烟气中过氧量的含量进行反馈控制,运用该控制方案实现了碱回收炉的智能控制.实践证明该方案是可行的,实现了碱炉燃烧的稳定、安全运行,提高了燃烧效率和热效率.     

基于网络的炼油装置腐蚀案例库的设计与开发

通过对腐蚀案例特征的分析,设计规范化的案例结构,并对案例库的功能系统进行分析与设计,建立基于网络的、可扩充的炼油装置腐蚀案例库.实现了从设备信息、关键词及工艺原则流程图等多层次、多角度对腐蚀案例的查询.     

CAN网络控制系统的网络时延分析与检测

针对CAN总线的实时特性,分析CAN网络控制系统的网络时延模型.结合CAN报文延迟时间在错误帧影响下的数学模型,分析了影响报文延迟时间的主要因素.通过所设计的CAN网络实验平台,在线检测CAN报文延迟时间,分析报文实际传输时延与理论分析的差异.实验表明错误帧及网络负载是造成较大网络时延的直接原因,进而验证了网络时延分析的有效性.     

基于ZigBee和Wifi的注塑机信息控制网络设计

为提高注塑机生产管理效率,基于ZigBee和Wifi设计了注塑机信息控制网络,并针对各项功能开发了应用软件。在ZigBee网络中设计了ZigBee终端,通过串口实现了注塑机面板控制;针对ZigBee网络和Wifi网络中不同协议的信息流通,设计了ZigBee-Wifi网关,解决了两种网络的联通问题,实现了注塑机远程监测和控制。该系统可以借助上位机对多台注塑机同时进行控制,有效提高了生产效率,确保了产品质量。     

大型油库罐区多网络自控系统设计及应用

给出了在大型油库罐区项目中使用多网络监控设备的有效解决方案.提出了整个系统分为管理级、过程级和现场级.从设计思想,网络结构及配置,通讯的设计、实现和系统优点4个方面进行了详细的论述.     

家校网络互联教学仿真设计

本文设计了一个家校网络互联仿真项目,并详细介绍了项目的设计、实现过程。经反复测试,所设计的网络运行稳定可靠,成功模拟了家校网络互联的过程。本项目简单明了,易于理解,有助于更好理解网络互联的原理,也为广大中小学科技辅导员提供了有益的参考。     

燃烧热的测定网络课程的教学设计

燃烧热的测定网络课程软件的教学设计,用于辅助学生进行网上预习,设计注重学生参与实验及数据处理过程,达到了相应的训练目的.本文介绍了该网络课程教学设计的开发和应用.     

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.     

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.     

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。     

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.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.