气泡直径与气浮净水效果关系的分析

分析了气泡尺寸与气浮净水效果的研究成果,并通过不同直径气泡对污粒捕获气泡几率及不同直径气泡对挟气污粒上浮速度影响等的分析,认为并非气泡直径越小,气浮净水效果就越好。     

全屋净水 全家健康--家庭中央净水系统

介绍了一种全屋净水、全家健康的全新净水新观念,对这种净水方式的优势进行了详细阐述.并与目前的分质供水系统进行了比较和分析.研究结论是,全屋净水是目前家庭净水的最佳方案,与目前普遍实行的小区分质供水(仅解决饮用水水质问题)相比,不仅节省了投资,降低了成本,而且提高了全部生活饮用水水质,便于今后与国际接轨.     

RSH型一体化净水设备在化工中的应用

介绍了一种新型一体化净水设备的原理、结构、操作要点及其在化工生产中的应用。根据实际使用情况作了技经分析。     

高稳定性氧化石墨烯净水分离膜的制备和应用进展

利用氧化石墨烯特殊的纳米片层结构,可以实现对有机物分子、无机盐离子等污染物的截留,达到净水的目的.从提高稳定性和改善性能的角度出发,综述了层间支撑型氧化石墨烯净水分离膜、交联型氧化石墨烯净水分离膜、还原型氧化石墨烯净水分离膜及多手段协同作用型氧化石墨烯净水分离膜的制备及应用,为获得具有高稳定性、优异截留选择性的氧化石墨烯净水分离膜提供了思路.     

粉末活性炭（PAC）在给水处理中的应用

由于水质标准的提高和受污染水源的不断增加,水厂一般用常规净水工艺难以将水中微量有毒、有害物质处理到符合安全、卫生要求的生活饮用水水质.活性炭.常与某些常规净水工艺适当结合,作为一种理想的深度净水手段.受到水处理工作者的高度重视.     

家用净水器净水材料标准与卫生安全性探讨

文章介绍了家用净水器的净水工艺流程,将常见的净水材料按照吸附过滤材料、膜材料、杀菌消毒材料进行了分类,讲解了其制作工艺和特点,列举出了国内外关于净水材料卫生安全的标准,并从试验方法、检测项目等方面进行了对比。同时,综述了国内在净水材料安全性方面的研究进展,对如何完善国内卫生安全评价标准提出了4条建议,为实现科学、客观、定量地评价净水材料的卫生安全性提供重要依据。     

净水设备用新型反渗透功能膜制备及应用研究

反渗透膜在使用过程中,常出现易结垢、寿命短、脱盐率低、水通量小等问题。主要针对净水设备用反渗透膜出现的问题进行改性实验研究,通过工艺设计并对其性能影响因素进行分析。通过含浸界面接枝法改性的新型反渗透功能膜通量和脱盐率达到了最佳的平衡状态,亲水性可控。据此方法进行中试后生产的新型反渗透功能膜脱盐率99.52%,水通量大于31.5 L/m²·h,净水产水量3000 L;节水率(净水产水率)57.5%。     

生态混凝土净水技术处理污水

介绍了生态混凝土的分类、性质、净水机理,并讨论了目前研究中存在的问题.     

美国对净水生产中主要设备和容器用化学品的规定（1998年）

目前国内市场上饮用水种类繁多,包括纯净水、蒸馏水、去离子水、太空水等。随着人们生活水平的提高,对直接饮用水(净水)的质量要求也越来越高,这就对生产净水的设备及容器提出了严格的要求。现将美国FDA所规定的生产净水用设备及容器中化学品的有关条文摘译如下,供国内相关行业读者借鉴。     

净水数学模型研究

1、引言 探求混凝剂的投加量与原水浊度及相关指标之间本质上的关系(净水数字模型)是自来水行业的专家和工程技术人员一向追求的目标,前人曾为此作了种种的努力,力求找出相应的定量关系,以揭示净水的本质。采用回归分析法推导净水数学模型是一种较常用的方法,但这些数学模型大多是一些多项展开式,一定程度上仪具有统计意义,而不具物理意义。较长一段时间来,笔者通过对搅拌试验     

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。