旧修备修复中焊接问题的探讨

旧设备在进行焊接修理凤有必备的材料进行充分试验。通过对钢材料的特性分析，结果使用碳钢材料的化学与机械性能之间内在联系的研究结果及碳钢时拉性能的试验总结，建立一种比较可行的方法。     

煤气预热器管束浮动管板裂纹分析

压力容器在制造和使用过程中都有可能产生裂纹。简述压力容器制造和使用过程中产生裂纹的种类、产生的原因及预防措施。结合某压力容器制造公司多年来在不锈钢材料性能、焊接工艺试验和研究基础上及制造、修理国内外多家不锈钢设备的经验和实践,分析煤气预热器管束浮动管板裂纹产生的原因,为不锈钢压力容器制造、修理和应用提供宝贵的经验。     

自动埋弧焊在不锈钢压力容器生产中的应用

本厂自动埋弧焊在不锈钢压力容器生产中的应用，填补了省内空白，本文结合生产实际，对应用过程中自动埋弧焊设备性能、焊接工艺因素、焊接材料及工艺参数选择、对比试验等进行综述。     

16MnDR钢制低温压力容器焊接及热处理工艺研究

通过焊接材料的选择,焊接及热处理工艺的调整,对16MnDR钢制低温压力容器焊接及热处理工艺进行了研究试验,最后得出了该类设备应用SMAW、GTAW、SAW焊接方法的焊接及热处理工艺措施和工艺参数。     

浅谈压力容器焊接技术在油田施工中的应用

焊接压力容器是施工中的一项关键工作,压力容器焊接在油田施工中的应用广泛,本文从人员、设备、材料、工艺和环境等方面对其进行阐述。     

浅谈压力容器焊接技术在油田施工中的应用

焊接压力容器是施工中的一项关键工作,压力容器焊接在油田施工中的应用广泛,本文从人员、设备、材料、工艺和环境等方面对其进行阐述。     

石化设备制造中的材料质量控制

由于石化设备制造过程中涉及工艺手段众多,选用材料的制作质量影响着整体设备的安全性能,研究石化设备制造中的材料质量控制。采用外部设备测量法标定压力容器焊缝位置,引入蚁群算法规划压力容器焊接轨迹,通过激光多点寻位识别焊接轨迹,调整焊枪位置拟合焊接轨迹,实现压力容器焊接质量的控制。模拟焊接实验结果表明,本文设计方法可以确保压力容器材料的焊接质量,验证该方法控制性能优越。     

钢制压力容器常用焊接工艺评定项目简

本文根据《承压设备焊接工艺评定》标准,提出钢制压力容器制造所需焊接工艺评定项目,并对标准中重要条款进行拓展与延伸,望能为压力容器制造企业的焊接工艺评定工作提供参考。     

钢制压力容器常用焊接工艺评定项目

本文根据《承压设备焊接工艺评定》标准,提出钢制压力容器制造所需焊接工艺评定项目,并对标准中重要条款进行拓展与延伸,望能为压力容器制造企业的焊接工艺评定工作提供参考。     

S30408厚板奥氏体不锈钢低温容器的焊接工艺

通过对70mm厚板S30408奥氏体不锈钢低温压力容器的焊接工艺研究,针对焊接材料的选用进行了认真的分析,并确定了合理的焊接工艺,保证了超低温下焊缝的质量,经试验成功用于产品的焊接。     

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。