压力容器焊接工艺评定计算机管理软件的开发及应用

本文介绍了“压力容器焊接工艺评定计算机管理软件”的主要功能及特点。 该软件适用于钢制压力容器焊接工艺评定的各项管理工作。经实际使用证明,该软件对于压力容器制造企业非常实用,显著的提高了压力容器制造中焊接工艺评定的工作效率、经济效益,以及管理水平和质量。     

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。     

中外焊接工艺评定方法以及焊接工艺规程和焊接工艺评定的标准体系

本文阐述了中外五种焊接工艺评定的方法和标准,对焊接工艺规程和焊接工艺评定的国家标准和国际标准体系进行综合分析对比,明确了我国压力容器焊接工艺评定方法类别。     

关于执行JB4708—2000《钢制压力容器焊接工艺评定》标准意见

各省、自治区、直辖市质量技术监督局: 《钢制压力容器接工艺评定》(以下简称《焊接工艺评定》)JB4708—2000,已经批准发布,并于2000年10月1日起实施。2000版《焊接工艺评定》标准与92版《焊接工艺评定》标准相比,内容有较大的变化,为既能有效地贯彻执行2000版《焊接工艺评定》,又尽量减少压力容器制造单位不必要的重复评定工作,经研究,提出如下意见,请各有关单位严格执行: 1、自发文之日起,制造压力容器的单位进行焊接工艺评定时,应按2000版《焊接工艺评定》标准进行。     

国家质量技术监督局办公室文质技监办发 [2001]003号 关于执行 JB4708— 2000《钢制压力容器焊接工艺评定》标准的意见

《钢制压力容器焊接工艺评定》 (以下简称《焊接工艺评定》 )JB4708— 2000,已经批准发布,并于 2000年 10月 1日起实施。 2000版《焊接工艺评定》标准与 92版《焊接工艺评定》标准相比,内容有较大的变化,为既能有效地贯彻执行 2000版《焊接工艺评定》又尽量减少压力容器制造单位不必要的重复评定工作,经研究,提出如下意见,请各单位严格执行： 1．自发文之日起,制造压力容器的单位进行焊接工艺评定时,应按 2000版《焊接工艺评定》标准进行。 2．按 92版《焊接工艺评定》标准评定合格的对接焊缝双面焊试件和堆焊试件的评定项目,继续有效。 3．按 92版《焊接工艺评定》标准评定合格的对接焊缝单面焊的评定项目,属于下列情况之一的,可继续有效： ①对接焊缝单面焊试件,试样的实际弯曲角度已达到双面焊试件要求的弯曲角度; ②原评定合格的焊接工艺评定项目,按 2000版《焊接工艺评定》要求,只补作弯曲试验的评定,并经检验合格。 4．对 2000版《焊接工艺评定》标准 4.3中型式试验件的评定,如焊接条件与 92版《焊接工艺评定》中组合焊缝试件相同时,则组合焊缝试件评定合格的项目适用该型式试验件。 5．上述可继续有效的评定项目和需补做弯曲试验的评定项目,对有冲击要求的,如其常温冲击平均值小于 27J,按 2000版《焊接工艺评定》标准要求,还须补做冲击试验的评定,并经检验合格。 6．继续有效的焊接工艺评定项目,其“焊接工艺指导书”和“焊接工艺评定报告”应按 2000版《焊接工艺评定》标准规定进行转化。 请将此文转发至本辖区内有关的压力容器设计、制造和检验单位。     

焊接工艺评定试验与焊接性试验的区别与联系--压力容器制造焊接质量控制(二)

本文指出焊接工艺评定是压力容器制造焊接质量控制的重要控制环节,焊接工艺评定应以可靠的焊接性为依据,比较了焊接工艺评定试验与焊接性试验的目的、方法、作用的区别,也指出了焊接工艺评定试验与焊接性试验的联系。     

征订《压力容器焊接工艺评定的制作指导》

为进一步提高行业准确执行焊接工艺评定有关标准的能力,保证焊接工艺的正确性和符合性,提高压力容器产品的焊接质量,中国化工装备协会组织有关人员依据NB/T47014-2011(JB/T4708)《承压设备焊接工艺规程》、NB/T47015-2011(JB/T4709)《压力容器焊接规程》等标准编写了《压力容器焊     

压力容器焊接工艺评定常见问题分析及解决措施

对有关压力容器制造焊接工艺评定中的常见问题进行了梳理,并给出了相应的解决措施,希望能对焊接工艺评定制作有一定的参考意义。     

加强压力容器制造过程控制提高产品焊接质量

对压力容器的制造过程控制作了系统的论述,包括焊前准备、焊接过程控制、焊接工艺评定及焊接工艺、焊缝返修和焊后检查等内容。     

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。