P2O5对阿利特—硫铝酸水泥熟产矿物形成及性能的影响

探讨了Ｐ２Ｏ５对阿特利－硫铝酸盐水泥熟料烧成，矿物形成及水泥性能的影响。结果表明，少量Ｐ２Ｏ５能改善生料的易烧性，降低烧成温度，但影响熟料矿物形成，使水泥３ｄ强度降低而７ｄ，２８ｄ强度增进较大；当Ｐ２Ｏ５大于０．５％，主要矿物Ｃ４Ａ３Ｓ和Ｃ３Ｓ的形成量明显减少，ｆＣａＯ升高，水泥各龄期强度均明显降低，凝结时间延长。     

3,4,5,三甲氧基苯甲醛的合成

３，４，５，三甲氧基苯甲醛的合成杨云澎，鹿贵波ＳＹＮＴＨＥＳＩＳＯＦ３，４，５，－ＴＲＩＭＥＴＨＯＸＹＰＨＥＮＹＬＢＵＴＹＲＡＬＤＥＨＹＤＥ１前言３，４，５－三甲氧基苯甲醛（ＴＭＢ）是３，４，５－三甲氧苄氨嘧啶（ＴＰＭ）的中间体，由于ＴＭＰ对黄胺类药...     

优化熟料配料方案提高熟料强度

为了获得较高的熟料强度、良好的物料易烧性,以及易于控制生产,选择适宜的熟料三率值是非常必要的。为此,本文将根据我厂２０００ｔ／ｄ窑尾带５级双系列旋风预热器和ＤＤ型分解炉的预分解窑（Φ４ｍ×６０ｍ）近几年的实际生产数据进行统计,寻求熟料强度与熟料三率值的关系。１根据熟料强度确定理论ＫＨ值的最佳范围众所周知,Ｃ３Ｓ是熟料的主要矿物,在水泥水化过程中水化速度较快,对熟料的３ｄ（Ｒ３）、２８天（Ｒ２８）强度起着关键性的作用。而在实际生产控制中,熟料中Ｃ３Ｓ的含量,是由熟料的ＫＨ值来决定的,去掉因ｆＣａＯ存在而未形…     

MgO对高钙硫铝酸盐水泥性能影响的研究

研究了ＭｇＯ对高钙硫铝酸盐水泥矿物形成及性能的影响,结果表明,含有０．５％的ＭｇＯ即可显著改善生料的易烧性,降低熟料中ｆＣａＯ的含量,促进Ｃ３Ｓ及Ｃ４Ａ３Ｓ两种主要矿物的形成。即ＭｇＯ含量这８％,熟料中ｆＣａＯ的含量亦显著降低,掺加ＭｇＯ使矿物的水化活性提高;当熟料中ＭｇＯ含量为０．５％～５％时,不泥强度显著提高,而达８％时,水泥强度则有所降低。     

P_2O_5对阿利特—硫铝酸盐水泥熟料矿物形成及性能的影响

探讨了Ｐ_２Ｏ_５对阿特利—硫铝酸盐水泥熟料烧成、矿物形成及水泥性能的影响。结果表明，少量Ｐ_２Ｏ_５能改善生料的易烧性，降低烧成温度，但影响熟料矿物形成，使水泥３ｄ强度降低而７ｄ、２８ｄ强度增进较大；当Ｐ_２Ｏ_５大于０．５％时，主要矿物Ｃ_４Ａ_３　和Ｃ_３Ｓ的形成量明显减少，ｆＣａＯ升高，水泥各龄期强度均明显降低，凝结时间延长。     

低碱度水泥早强剂的研制及其机理

研究发现，在含微量氟的ＣａＯ－Ａｌ２Ｏ３－ＳｉＯ２－ＢａＳＯ４系统中，于１２００～１３５０℃合成的含钡硫铝酸盐熟料，对低标号水泥具有促进凝结和提高早强的作用，将其与有机物复合后可制备一种对水泥早、后期强度具有显著增强作用的新型低碱度复合早强剂。采用ＸＲＤ、ＳＥＭ、压汞法、结合水测定等测试方法进行研究表明，水泥熟料矿物水化的加速，水化早期较多数量钙矾石的形成和水化产物间的较好连结，以及水泥石结构的致密化是水泥强度得以提高的主要原因。     

钙矾石在湿热环境下结构变异性的研究

通过ＤＴＡ，ＳＥＭ观察和大量Ｘ射线衍射分析，给出钙矾石稳定存在和结构脱水变异的温度范围以及变异后的结构特征；得出了以钙矾石为膨胀源的自应力水泥混凝土的稳定使用范围。     

锰对硅酸盐水泥熟料燃烧的影响

通过高温差热分析,ＸＲＤ,高温显微镜分析,ＳＥＭ,ＥＰＭＡ以及测定ｆＣａＯ等方法研究了ＭｎＯ２对硅酸盐水泥熟料煅烧的影响。试验结果表明,锰主要分布在中间相,随着ＭｎＯ２外掺量的增多,熟料中铁相含量增多,Ｃ３Ａ及Ｃ３Ｓ含量减少,液相量大量出现的温度升高。     

一种新形态钙矾石—管状钙矾石

用扫描电镜、Ｘ射线能谱仪观测和分析了硫铝酸盐水泥系列的水化产物钙矾石的一种特殊显微形貌－管状钙矾石。在水泥净浆试体中、界面上、不同石膏掺量的水泥浆试体、砂浆试体、水化的熟料颗粒中均可观测到管状钙矾石。它的形成可能与非平衡状态生产的熟料中Ｃ４Ａ３Ｓ矿相的某种晶体结构有关。     

膨胀抑制剂的作用与机理

使用实际生产与工业窑特制的两种水泥样品，通过 ＸＲＤ分析、ＳＥＭ观测以及 Ｒ２Ｏ、膨胀性能的测定，研究了硅灰、矿渣对自应力硫铝酸盐水泥前期胀裂和自由膨胀的抑制作用与机理；提出了膨胀抑制剂的观点；认为在限制水泥Ｒ２Ｏ含量的同时引入矿渣作膨胀抑制剂构成水泥的基本组分，可加速钙矾石形成及Ｃ２Ｓ的水化反应，增加Ｃ－Ｓ－Ｈ凝胶量，显著降低无效膨胀，具有充分的使用安全性；用该水泥制造的压力管，可以同时避免前期与后期两类爆管事故。     

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。