分析ZnO压敏电阻器漏电流爬坡现象的影响因素及其解决措施

分析了实际生产中对ＺｎＯ压敏电阻器的漏电流爬坡产生影响的主要因素，提出了解决漏电流爬坡的措施，为ＺｎＯ压敏电阻器的生产提供了一定的理论依据。     

氧化铟对ZnO压敏陶瓷压敏特性及微观结构的影响

用粒度为０．１－０．３ｍｍ的氧化锌偻末为原料，制得了氧化锌压敏陶瓷片，研究了Ｉｎ２Ｏ３掺杂对其压敏特性和微观结构的影响。结果表明；这种氧化锌粉末具有很高的烧结活性，适合作低压压敏电阻器。     

提高ZnO压敏电阻器的可靠性的分析

分析了ＺｎＯ压敏电阻器在可靠性方面的影响因素，提出了提高产品可靠性的途径。     

分析ZnO压敏电阻器漏电流爬坡现象的影响因素及其解决措施

分析了实际生产中对ＺｎＯ压敏电阻器的漏电流爬坡产生影响的主要因素,提出了解决漏电流爬坡的措施,为ＺｎＯ压敏电阻器的生产提供了一定的理论依据。     

Y系掺杂的TiO2压敏陶瓷性能研究

通过在TiO2压敏陶瓷制备过程中引入Y系作为受主掺杂,讨论了以Y取代Bi受主掺杂对双功能TiO2压敏陶瓷性能的影响.实验结果表明:以Y系掺杂的Ti-Nb基压敏陶瓷可获得较好的低的压敏电压与高的电容双功能特性.其中,以Y+Cu为受主掺杂剂,SiO2为烧结助剂的配方,在1300℃温度下烧结,获得压敏电压V1mA＝9.4V/mm,非线性系数α＝4.8,介电常数ε＝21300,介电损耗tanδ＝0.09较优异的压敏介电性能.同时Y系掺杂也避免了掺杂Bi的高温挥发性.     

压敏电阻器的应用与发展

概述了压敏电阻器尤其是氧化锌压敏电阻器的应用及发展动向。     

ZnO压敏电阻器低压化浅谈

国内外有关ZnO压敏电阻器低压化方法方面的研究报道很多。本文在整理诸多文献资料的基础上，按照各种方法的理论依据对它们进行了较为系统的归类及评述，并对ZnO压敏电阻器低压化方法的发展趋势作了初步探讨。     

氧化铟对ZnO压敏陶瓷压敏特性及微观结构的影响

用粘度为0．1～0．3mm的氧化锌粉末为原料，制得了氧化锌压敏陶瓷片，研究了In_2O_3掺杂对其压敏特性和微观结构的影响、结果表明：这种氧化锌粉末具有很高的烧结活性，适合作低压压敏电阻器。当烧结温度一定（1240℃）时。阀值电压Vc随着In_2O_3含量的增高而增加，其原自是由于In_2O_3含量的增加，在高温时烧结体内In_2O_3的分解量增加，从而使烧结体中的孔隙率增加。导电性降低。     

低压ZnO压敏陶瓷晶粒边界电子陷阱态的研究

应用４１９２Ａ低频阻抗分析仪测量了低压ＺｎＯ压敏陶瓷的复电容曲线,研究了烧结温度对复电容曲线压低角的影响规律,探讨了晶粒边界耗尽层中电子陷阱的种类和起因并对电子陷阱的特征参数进行了表征．实验发现：在低压ＺｎＯ压敏陶瓷中存在两种非理想的Ｄｅｂｙｅ弛豫现象,对于每一种弛豫,其复电容曲线存在压低现象,且其压低角随着烧结温度的升高而迅速减小．在低压ＺｎＯ压敏陶瓷的耗尽层区域内存在两种电子陷阱,它们分别位于导带底０．２０９和０．３４２ｅＶ处,其中０．２０９ｅＶ处的陷阱能级对应于本征施主Ｚｎ×ｉ的二次电离,而０．３４２ｅＶ处的陷阱能级对应于氧空位ＶＯ的一次电离．     

水热合成钛酸锶粉体增强压敏电阻器电性能的研究

以硝酸锶Sr(NO3)2为锶源、酞酸四丁酯Ti(OC4H9)4为钛源,加入矿化剂NaOH/KOH,在130℃下反应24h水热合成了SrTiO3粉体。将水热粉体应用到压敏电阻器中,分别采用XRD、电性能测试、SEM等手段对产物进行表征。电性能测试结果显示,与传统固相法制备的SrTiO3压敏电阻器相比,同配方下此类压敏电阻器电性能获得显著提高,压敏电压V1mA和非线性系数ɑ分别达到120V和8。     

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.     

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.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.