车用橡胶空气减震弹簧及其市场

根据橡胶空气减震弹簧的功用特点,介绍了橡胶空气减震弹簧的结构原理及其类型;论述了橡胶空气减震弹簧的主要性能特点和工作特性参数;同时指出了橡胶空气弹簧的发展前景。     

汽车橡胶空气弹簧的研制

汽车橡胶空气弹簧的研制本文简介了河南尉氏县橡胶厂Ｂ２６０－３４０型橡胶空气弹簧的研制。１结构尺寸橡胶空气弹簧是由外层胶、内层胶、帘布层、钢丝圈等组成的元件。本厂研制的橡胶空气弹簧结构尺寸见附图。附图Ｂ２６０－３４０型橡胶空气弹资的结构尺寸示意图２配方...     

汽车悬架空气弹簧静态力学性能有限元建模与计算

以一款膜式橡胶空气弹簧作为研究对象,进行了三维建模和静态力学特性有限元分析,并与实验测试结果对比,验证了采用有限元软件对空气弹簧的建模与力学性能计算结果的准确性与可行性。文中的有限元建模和计算方法对空气弹簧力学性能计算分析与优化设计具有一定的指导意义。     

橡胶空气弹簧的研制

橡胶空气弹簧的研制尉氏县橡胶厂张清俊近年来，我国从国外进口了大量的豪华客车，均采用橡胶空气弹簧，已成为汽车的重要配件和易损件。根据我国现有客车以及将来发展和改造的客车数量，如选用橡胶空气弹簧，估计其各种规格的年需求量将达１００万只左右，市场前景广阔。...     

橡胶空气弹簧

橡胶空气弹簧专利号ＺＬ９２２１０７３９．４公开日期１９９３年６月９日专利权人丹东市橡胶二厂地址辽宁省丹东市振安区浪头街３５２号（１１８００９）本实用新型橡胶空气弹簧是一种结构简单、通用性强、联接结构好的橡胶空气弹簧，特别适用于造纸、印染、纺织、化工机...     

复合减震橡胶空气弹簧总成的研制

介绍复合减震橡胶空气弹簧（由减震器、橡胶空气弹簧、上盖、上箍环、下箍环、下底座和密封圈组成）的研制。成品试验结果表明，本研制复合减震橡胶空气弹簧气密性、爆破压力、静态特性和疲劳寿命均满足国家或企业标准要求。     

现代汽车的脊梁——橡胶空气弹簧悬架

根据汽车用橡胶空气弹簧悬架的变迁,介绍了汽车用橡胶空气和油气弹簧的种类和结构特点及参数;同时,还指出了橡胶空气弹簧的发展趋势。     

基于ABAQUS的汽车橡胶空气弹簧振动特性有限元分析

针对汽车橡胶空气弹簧存在的流固耦合问题,采用ABAQUS软件对橡胶空气弹簧系统进行模拟,完成橡胶空气弹簧的特性有限元分析。利用Symm-Transform的功能优势,实现橡胶空气弹簧轴对称模型到3D模型的转换。为保证汽车橡胶空气弹簧橡胶气囊的隔震效果,将橡胶空气弹簧的动刚度无限趋近于静刚度。当工作气压为0.6 MPa时,动静刚度比为1.32;当工作气压为0.7 MPa时,动静刚度比为1.27。不同工作气压下的动静刚度比均小于1.4,可证明该汽车橡胶空气弹簧气囊具有良好的隔震效果。     

橡胶空气弹簧的应用和发展

橡胶空气弹簧已越来越广泛地应用于汽车、地铁、轻轨列车、磁悬浮列车和工业机械。随着我国公路的发展和运输量的增大以及政府对高速公路养护的重视,橡胶空气弹簧的应用将进一步扩展,且橡胶空气弹簧将向电控式空气弹簧方向发展。     

橡胶空气弹簧隔振设计及性能分析

橡胶空气弹簧是气囊减振器,随着各种精密仪器的广泛应用,这些精密仪器的使用对外界环境的要求也越来越高。在隔振方面,用橡胶空气弹簧进行隔振,减少了外界环境对各种精密仪器的影响。本文具体剖析了橡胶空气弹簧的隔振设计和隔振性能,表明橡胶空气弹簧在一些高精度仪器、工业设备以及车辆上的一些隔振设计是合理可行的。     

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。