ETAP仿真软件在化工企业电力系统设计中的应用

结合小型化工企业电力系统,应用ETAP软件对其进行潮流仿真分析、短路仿真分析、电机启动仿真分析和暂态稳定性仿真分析。ETAP软件进行电力系统仿真分析时具有速度快、结果准确等优点,其仿真结果为电力系统的设计、运行及继电保护设置等提供了依据。     

电泳仿真技术在发盖开发中的应用

运用电泳仿真CAE技术对车身电泳膜厚进行了仿真分析,结合实车拆车漆膜测试对实车结果与仿真分析结果比较,结果基本一致,仿真分析能够准确、有效地反映车身漆膜状况。针对发盖模型进行结构调整,再次运用CAE仿真分析,得出合理的设计方案,从而提升了产品的强度和防腐性能。     

船用天线罩的冲击响应分析与试验验证

采用ANSYS有限元分析软件,对某船用天线罩进行冲击响应分析.考察罩体结构的危险区,分析敏感部位的应力、位移和加速度等的时间历程,并且通过冲击试验验证仿真分析的正确性,最终仿真结果与测试结果基本符合,验证了仿真分析的准确性.     

基于符号有向图分析的炼油厂中渣油催化裂化危险与可操作性

作为危险与可操作性(HAZOP)研究的一门辅助技术,符号有向图(SDG)分析技术迅速得到普及.仿真工厂数据是流程工业在线数据最理想的近似,能够体现过程变量之间的相互关系.本文以石油化工典型的渣油催化裂化装置为例,将SDG分析与基于机理模型的动态流程模拟仿真工厂结合起来,通过仿真工厂数据形成专家经验,进而在SDG辅助平台实施HAZOP分析,此外,分析结果也可以进一步作为HAZOP分析的知识库.同时,仿真工厂又可以验证事故传播路径,从而起到筛选SDG生成的事故序列的作用.相比于传统的专家组会议而言,将仿真工厂模拟数据运用于SDG分析中,能大幅缩短HAZOP分析时间,减少人员及投资,并且获得更为全面、准确的分析结果.     

基于Adams和Matlab二自由度系统振动的仿真分析研究

以一个二自由度无阻尼振动系统为研究对象,通过分析该系统的振动形式及受力状况,利用ADAMS对二自由度无阻尼振动系统建立模型,合理的进行仿真及分析,并运用MATLAB仿真软件验证该模型的振动轨迹曲线的正确性。再通过ADAMS和MATLAB仿真软件对仿真结果进行联合仿真,仿真数据进行对比验证,分析二自由度系统受迫振动的运动轨迹,对实际工程研究受迫振动具有一定的参考实用价值。     

数值仿真技术在轮胎硫化定型工艺中的应用

以有限元分析软件Abaqus为仿真计算平台,开发了一整套进行胶囊硫化变形行为的仿真分析方法,模拟胶囊从收囊筒到充气定型的整个过程,就定型压力等工艺参数对定型效果的影响进行仿真分析和对比。结果表明,定型压力及上压盘的定型高度和直径等对定型效果影响明显,证明仿真分析结果与实际情况符合较好。     

碟式分离机自动化仿真分析研究

有限元方法是碟式分离机应力和变形计算的有效方法,但要求较高的专业基础。大部分仿真软件无法实现与CAD的无缝连接,造成了大量的重复劳动,研发人员对仿真自动化的要求越来越高。针对碟式分离机仿真的现状,对碟式分离机的各种工况进行了详细地分析,基于VB的接口技术和ANSYS Workbench平台,开发出了碟式分离机的自动化仿真分析软件AutoSim。详述了自动化仿真分析方案的实施,并通过具体优化实例,验证其方法的可靠性与高效性。     

颤振模型对稳态误差分析的影响

通过理论分析和计算机仿真研究了经典切削颤振模型的稳态误差,发现该误差值随切削条件的变化而大幅度变化,这导致数控机床切削动态特性的仿真结果严重失实。在分析经典模型不足的基础上建立了一个新的切削颤振模型,理论分析和仿真表明新模型的稳态误差趋于零,它为数控机床的切削动态特性仿真提供了可靠的数学模型。     

TNS／ODS系列低噪声轮胎花纹仿真分析与优化软件的应用

介绍TNS／ODS系列低噪声轮胎花纹仿真分析与优化软件的应用。经相关企业多年使用证明,TNS／ODS系列低噪声轮胎花纹仿真分析与优化软件功能全,使用方便,智能化程度高,可以对轮胎花纹噪声进行评价诊断、仿真分析、放声鉴听和优化设计,实用性好。     

虚拟仿真实验在仪器分析实验教学中的应用

卫生检验与检疫专业的 《仪器分析》 课程,注重培养学生实践能力和综合知识运用能力.在传统实验教学模式基础引入虚拟仿真实验克服了传统实验教学条件短缺,实验效率偏低等弊端.通过分析虚拟仿真实验的特点和优势,结合虚拟仿真实验在我校卫生检验检疫专业的《仪器分析》课程的具体应用情况进行阐述,研究虚拟仿真实验教学方法在仪器分析实验...     

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。