和谐融洽师生关系的建立及其对大学有机化学教学效果的影响

和谐融洽的师生关系在教学过程中具有重要的作用,直接影响到教师教学和学生学习的效果。本文讨论了目前大学师生关系所存在的问题及构建和谐融洽师生关系的对策,并以大学有机化学的课程教学为实例,验证了和谐融洽的师生关系对大学课程教学具有重要的影响。     

浅谈《化工工艺学》课程教学中和谐课堂的构建

以《化工工艺学》课程教学为载体,探索如何营造平等师生关系,构建和谐教学课堂,提高授课时效。实践表明:营造平等、和谐、民主的新型师生关系,激发学生学习兴趣,使学生在轻松的学习中获得知识,可以构建和谐课堂追求学习与教学的最大有效性。     

浅谈体育课教学中如何建立和谐的师生关系

建立良好的师生关系,创立良好的教学情境,师生在和谐的氛围中学习。努力提高学习效率。构建一个人道的、和谐的、民主的、平等的师生关系,为每一个学生的全面发展尽自己最大的努力。     

博士生奖学金体系在构建和谐师生关系中的作用分析

依照研究生培养机制改革指导精神,在提炼奖学金体系构建要义的基础上,新的博士生奖学金体系将会大大改善师生关系,构建新型和谐师生关系。本文分析了两者的相互作用,从民主、平等、自主的师生关系,形成研究性互动这一内核,得力于德治和法治的双重保障,构建师生心灵性交往之共同愿景等四个方面做出了论述和分析,以期形成有利于博士生培养和教育管理的生动局面。     

构建新型师生关系 提高学生学习积极性

师生关系是教育教学活动中最基本、最重要的人际关系,对教育教学活动的效果和学生的身心发展有着重要影响。高校作为和谐社会的组成部分,应是体现中国特色社会主义高校本质的、新型的、和谐的高校。高校的教师和学生作为高校的核心角色,他们的关系也应呼应建设社会主义和谐社会这一时代主题,应该呈现出和谐、民主、平等的特征。本文从三个方面提出了构建高校新型师生关系的对策。     

构建高职院校和谐师生关系的主要目标与有效途径

随着我国高等教育大众化和发展方式转变,和谐师生关系的问题凸现在高职教育工作者面前.影响高职院校师生关系和谐的主要因素是学生就业能力培养的有效性.建立和谐师生关系的基本目标是建构师生共同学习体,基本途径是在学习型组织框架下提高师生的组织学习能力.     

构建和谐化学课堂的几点想法

良好、宽松的和谐课堂,是教师教学顺利进行的保证,是学生创新和实践能力发展的温床。在课堂教学中,我们应该积极营造和谐课堂,使学生善思乐学,全面提高学生的素质,培养学生的创新精神和实践能力。那么如何构建和谐课堂呢?我们可以通过创造和谐师生关系、创造愉悦的问题情境、提高教师自身素质,共建和谐课堂。     

读图时代如何构建和谐师生关系

分析了衍生的读图时代的文化因素影响着师生关系,师生关系出现了短暂化、虚化、固定化、庸俗化等现象,试图从中找到读图时代下的和谐师生关系的办法和建议,以加深对师生关系的进一步认识,有助于我们清晰读图时代下各种观念的冲击,明确教育背景,从而更好地发展高等教育。     

日用化学品与健康教学中培养学生学习兴趣的探讨

结合以往的教学实践,针对学生学习《日用化学品与健康》过程中存在的一些问题,就如何培养学生的学习兴趣,本文从充分了解授课对象知识基础、构建良好、和谐的师生关系、改变教学方式和手段、联系日常生活实际和改变评价方式五个方面进行了探讨,提出了激发学生学习兴趣的可行性途径。     

构建仪器分析的高效课堂

构建高效课堂一直是教育者关心和思考的问题。如何构建仪器分析的高效课堂，文中从师生关系、教师能力、学生兴趣、个体差异和实验教学5个方面进行了讨论。     

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。