大长径比固体火箭发动机壳体轻量化设计

针对目前对大长径比碳纤维复合材料壳体封头部位补强及壳体轻量化减重问题,基于网格理论,完成?180 mm固体发动机燃烧室壳体的铺层设计,然后设计壳体螺旋缠绕层厚度减薄,采用碳布、碳纤维编织预浸封头帽两种方式对封头补强;根据三次样条公式,计算出封头位置厚度曲线;通过有限元ABAQUS仿真软件对三种结构形式进行模型分析计算,研究壳体应力状态及爆破压强;进行壳体试制及水压爆破试验,研究分析碳布补强和碳纤维编织预浸封头帽对封头补强的影响。结果表明:碳布补强效果不明显,而按照一定纵环比编织的碳纤维预浸封头帽强度远大于碳布增强,其补强强度与螺旋缠绕强度基本一致;采用碳纤维编织预浸料封头帽补强较基础样本成型方式重量降低14.1%。     

碳纤维／环氧固体火箭发动机壳体补强现状

论述了碳纤维缠绕固体火箭发动机壳体的主要特点,碳纤维／环氧树脂复合材料壳体在实际应用中,影响壳体内压性能的因素,介绍了当前在碳纤维／环氧树脂复合材料壳体补强方面的主要工作和不足之处,并指出今后工作的主要努力方向。     

碳纤维复合材料补强技术在燃气管道上的应用研究

碳纤维复合材料补强技术,在当前燃气管道的修复和维护工作中能起到良好的作用和效果。补强主要是针对燃气管道的一些缺陷进行有效地修复,积极采用有效地方法,提升燃气管道的使用效果,延长其使用寿命。主要从碳纤维复合材料补强技术的修复原理和具体应用优势入手,针对碳纤维复合材料补强技术的相关情况进行详细介绍,同时还针对碳纤维复合材料补强技术在燃气管道上的应用情况进行了全面说明和分析,并用实际案例作了说明。     

碳纤维复合材料在基础设施和土木建筑上的应用

本文介绍碳纤维复合材料在基础设施和土木建筑上的应用，包括在基础设施和土木建筑上采用复合材料的优点，用碳纤维复合材料修复补强技术与应用，碳纤维复合材料应用在基础设施和土木建筑的研究推广计划和复合材料在基础设施和土木建筑上应用的标准和法规。     

基于ANSYS的复合材料壳体封头内压变形数值模拟分析

为了分析复合材料壳体封头在内压作用下的变形规律,本文针对椭球比为1.7的复合材料壳体前封头,采用ANSYS商业软件中的层合单元对其进行分析,数值模拟与水压试验结果基本一致。首先模拟了椭球比为2.0的复合材料壳体前封头,结果表明,前开口至赤道部位经线方向顺纤维应变表现为先增加后较小的规律,同时,前封头部位的最大位移发生在封头部位经线方向的中部;另外,对比分析了椭球比为1.7的封头比和椭球比为2的封头内压应变,前者应力变化更均匀,符合复合材料壳体的等应力封头设计要求。     

碳纤维复合材料在基础设施和土木建筑中的应用

本文介绍碳纤维复合材料在基础设施和土木建筑上的应用,包括在基础设施和土木建筑上采用复合材料的优点,用碳纤维复合材料修复补强技术与应用,碳纤维复合材料应用在基础设施和土木建筑的研究推广计划和复合材料在基础设施和土木建筑上应用的标准和法规.     

浅谈碳纤维补强技术在工业管道中的应用实践

简述了碳纤维复合材料补强技术的基本原理、适用范围、方案设计及其施工工艺要点。介绍了在役含缺陷工业管道应用该技术的可行性,分析认为,碳纤维复合材料补强技术在管道修复领域具有较好的应用前景。呼吁建立一套完善的符合我国国情的现场施工规范及验收评价标准,以提升国内在役管道维修水平。     

基于RCC-M规范的压力容器开孔补强计算

容器壳体或封头上的开孔会削弱容器壁的强度,且在开孔附近会形成应力集中,因此需要对容器开孔进行补强设计。RCC-M规范是压水堆核岛压力容器设计的常用规范,本文介绍了基于RCC-M规范的容器壳体开孔补强计算方法和补强要求,并结合具体算例讲解所需补强面积、补强边界、可用作补强金属的计算方法,为类似化工容器的设计计算提供了参考。     

碳纤维复合材料加固混凝土板的有限元计算与分析

建筑工程中广泛采用混凝土板,而对大面积板采用碳纤维复合材料(CFRP)对混凝土结构进行加固补强是一项先进的技术.本文介绍了碳纤维布材料的性能及碳纤维加固技术的主要功能、特点,并用ANSYS有限元软件进行了计算分析.     

用碳纤维复合材料层压板修复、补强混凝土结构

本文介绍了用碳纤维复合材料（CFRP）层压板修复，补强混凝土结构的方法特点，使用的材料，施工程序和使用情况，说明了这种方法和碳纤维片材修复，补强法各有特点，可以相互补充，共同发展     

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。