凝胶注模成型制备大尺寸臭氧发生器陶瓷基板

讨论了用凝胶注模成型制备大尺寸臭氧发生器陶瓷基板的过程。本实验以化学式为Ba（Sm，Nd）2Ti5O14的介电陶瓷为固相粉末．以丙烯酰胺（MBAM）为凝胶有机单体，用传统球磨的方法制备出了高固相、低粘度的陶瓷浆料（浓悬浮体）。分析了凝胶注模成型与干压成型制备的Ba（Sm，Nd）2Ti5O14陶瓷基板的体积密度、结构均匀性以及电学性能不同的原因。结果表明：凝胶注模成型制备的Ba（Sm，Nd）2Ti5O14陶瓷基板具有体积密度商、结构均匀的特点。合理使用凝胶注模成型工艺可以提高陶瓷介电常数、抗电强度和降低介质损耗。     

凝胶注模成型制备BaNd2Ti5O14介电陶瓷的电学性能

讨论了用凝胶注模成型制备BaNd2Ti5O14介电陶瓷的过程。本实验以化学式为BaNd2Ti5O14的介电陶瓷为固相粉末,以丙烯酰胺(MBAM)为凝胶有机单体,用传统球磨的方法制备出了高固相、低粘度的陶瓷浆料(浓悬浮体);采用正交实验设计法,优化出生坯密度最大的配方。分析了凝胶注模成型与干压成型制备的BaNd2Ti5O14介电陶瓷的体积密度、结构均匀性以及电学性能不同的原因。结果表明:凝胶注模成型制备的BaNd2Ti5O14介电陶瓷具有体积密度高、结构均匀的特点。合理使用凝胶注模成型工艺可以提高陶瓷介电常数、降低介质损耗。     

最新风冷式陶瓷高效臭氧发生器研制成功

结构特点：（无需水冷，高效臭氧发生器）1、双冷陶瓷板式臭氧发生器介质选用高品质99瓷，介电常数高。高频特性好，陶瓷板的击穿电压为12000V，放电电压仅为3000V，绝不会击穿。     

臭氧发生器用Al2O3陶瓷基板材料的改性研究

研究了掺杂成分MgO,TiO2,Y2O3,MgTiO3,CaTiO3对臭氧发生器用Al2O3陶瓷基板材料的体积密度、介电常数、介质损耗、热导率等性能的影响,实验结果表明,较合适的掺杂配方是Y2O3 0.6wt%,MgTiO3 0.2wt%,CaTiO3 0.2wt%。     

臭氧发生器用AlN陶瓷基板材料的研究

为了提高臭氧发生器的臭氧产量,要求臭氧发生器用的陶瓷基板材料具有较高的介电性能和热导率.本文研究了掺杂成分CaO、Y2O3、YF3、(Y,Ca)F3对臭氧发生器用AlN陶瓷基板材料的相对密度、热导率、介电常数、介质损耗等性能的影响.采用XRD分析其物相和SEM观察其显微结构,结果表明,掺杂成分对改善陶瓷基板材料性能的作用大小依次排列为(Y,Ca)F3>YF3>Y2O3>CaO,最适合的掺杂配方是(Y,Ca)F33.0wt%,YF32.0wt%,Y2O31.0wt%,CaO1.0wt%.     

臭氧发生器用Al_2O_3陶瓷基板材料的改性研究

研究了掺杂成分MgO、TiO2 、Y2 O3 、MgTiO3 、CaTiO3 对臭氧发生器用Al2 O3 陶瓷基板材料的体积密度、介电常数、介质损耗、热导率等性能的影响 ,实验结果表明 ,较合适的掺杂配方是Y2 O3 0 .6wt %、MgTiO3 0 .2wt %、CaTiO3 0 .2wt%     

用改性淀粉原位凝固成型制备Al2O3陶瓷

陶瓷凝胶注模成型工艺是一种新颖的成型工艺,它将高分子化学单体聚合的思路引入到陶瓷的成型工艺中.本文用改性淀粉原位凝胶注模成型技术制备了具有较高强度和均匀性良好的氧化铝陶瓷坯体.研究了氧化铝陶瓷的凝胶注模成型工艺中低粘度高固相体积分数浓悬浮体的制备、浓悬浮体的固化、成型坯体的显微结构及性能.     

臭氧发生器用金红石陶瓷薄壁管的研制

采用陶瓷胶态注射成型工艺及装备,成功制备了壁厚1.0mm,直径47.6mm,长度300～500mm的臭氧发生器用、性能优异的大尺寸陶瓷薄壁管,用该薄壁管装配臭氧发生器,臭氧产生效率达170g/kWh,起晕电压从通常的4000～10000V降低至约1000V左右,为臭氧发生器的安全运行提供了有利条件;对臭氧发生器的低压起晕原理进行了分析.     

陶瓷凝胶注模成型技术及其应用研究

凝胶注模成型技术是一种近净尺寸陶瓷成型技术，它为解决陶瓷材料的加工成型问题提供了一条十分有效的工艺途径。介绍了陶瓷凝胶注模成型技术的基本原理和工艺过程，着重介绍了目前凝胶注模成型技术的应用研究。     

陶瓷凝胶注模成型技术及其应用研究

凝胶注模成型技术是一种近净尺寸陶瓷成型技术，它为解决陶瓷材料的加工成型问题提供了一条十分有效的的工艺途径。介绍了陶瓷凝胶注模成型技术的基本原理和工艺过程，着重介绍了目前凝胶注模成型技术的应用研究。     

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.     

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。     

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.