民族地区高校材料化学专业英语教学现状及对策

专业英语教学在培养材料化学专业创新型人才具有重要地位。文章结合自己的教学实践,针对民族地区高校材料化学专业英语教学现状,通过对学生英语基础、教材建设、教学内容设置、师资队伍、教学方法、考核方式等方面进行分析,提出相关教学建议,以提高民族地区高校材料化学专业英语教学水平。     

师范院校化学专业英语教学改革

化学专业英语是师范院校化学教育专业的一门必修课,文章重新定位了师范院校化学专业英语的教学目标.探讨了从教材建设、词汇及教学形式等方面进行改革实现这种教学目标的方法.     

浅谈地方性院校化学专业英语教学的现状与改革

化学专业英语是化学专业学生一门重要的课程,对学生英语素养和能力的提升具有很大的帮助。本文总结了当前地方性院校中化学专业英语教学中存在的问题,结合多年的实际教学经验,并对这门课程的教学现状做出了研究。从教材改进、教学方法改革、激发学生学习兴趣等方面对该课程的教学提出一些解决方案,探讨了化学专业英语教学改革,希望对该课程的教学能够一定的帮助作用。     

浅谈化学化工专业英语教学改革

专业英语是大学英语教学的一个重要组成部分.本文结合<大学英语教学大纲(修订版)>和<大学英语课程教学要求(试行)>对专业英语教学的要求,从教育管理、教材建设、师资队伍、教学方法、考核方式等方面探讨了化学化工专业英语教学的教改之路.     

论化学化工专业英语教学改革

化学化工专业英语是大学专业英语不可缺少的一部分,是培养21世纪复合型化工人才的关键之一。目前我国化学化工专业英语教学存着许多问题,化工专业英语教学应明确培养目标、加强教材建设、优化课程设置、提高教师素质、改革教学模式、注重培育学生的应用能力。     

化学专业英语课程教学改革与实践

化学专业英语是化学专业必不可少的一门课程,是学生继续深造、毕业工作以及查阅科技文献和解决相关课题的基本交流工具。因此,如何高效地向学生传授化学专业英语,是这门课程必须要面对的问题。结合当前化学专业英语教学的存在的现状,文章提出从化学专业英语教学目标、优质教材、教学方法、灵活评定成绩、拓展教学资源和双语教学等方面进行改进措施,以促进化学专业英语的教学能力水平的提高,从而培养高素质人才。     

化学专业英语教学改革的实践与探索

化学专业英语是英语与化学专业知识的结合,对提高学生的专业学术修养、培养复合型人才起着重要作用。阐述了化学专业英语的特点及其教学现状和存在的问题,并结合教学实践,介绍了化学专业英语的一些改革举措。     

关于化学化工专业英语教学的思考与探索

化学化工专业英语是我院化学化工专业本科生的一门非常重要的专业必修课,课程注重学生英语实际运用能力的培养。文章结合专业英语课程的特点,对教学过程中常出现的问题与难点进行剖析,并结合教师的教学经验,从教材和教学内容的改革、教学模式调整和如何调动学生的学习积极性、创新师资组合和发挥教师特长、注重专业英语课程与科技文献检索课程和毕业设计环节的结合等方面进行了探索和改革,提出了一些中肯的建议。     

《化学专业英语》多维联动教学模式探讨

化学专业英语是一门建立在大学英语、化学专业核心课程基础上,旨在提高学生在化学专业领域英语应用能力的重要课程。为了使化学专业英语教学更好地适应新形势下化学专业人才培养需要并有效达成人才培养目标,本文在分析当前化学专业英语课程教学现状的基础上,结合讲授化学专业英语的实践,就如何从多维联动角度有效加强课程与课程、第一课堂与第二课堂、教与学互动配合进行尝试和探讨,以期不断提高化学专业英语教学质量,促进学生化学专业素质和语言交流应用能力的全面发展。     

化学专业英语的教学感悟

为了有效提高化学专业英语的教学质量,在化学专业英语教学的实践基础上,结合该课程的特点及教学现状和存在问题,有针对性地研究化学专业英语教学方法。通过寓乐于学,培养学生的学习兴趣;通过精选教材,体现教学内容的实用性;采取形式多样的教学方法,突出学生的参与性,激发学生学习的积极性,培养学生自主学习的能力和语言运用能力。     

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。