多媒体网络环境下的大学英语教学模式探讨

为了能够促进大学英语教学过程,保证教学质量,合理地利用多媒体网络环境成为很多授课教师的必然选择。多媒体网络环境有着得天独厚的教学优势,是互联网和科学技术发展的综合产物。从目前的情况来看,虽然多媒体网络技术已经发展了很多年,但是其在大学英语教学环节中的作用并没有充分地发挥出来,当前大学英语教学环节仍然存在一些问题。因此,本文首先对当前大学英语教学过程中存在的问题进行阐述,而后基于多媒体网络环境,对改善大学英语教学模式的策略进行论述,这对于更充分地在多媒体网络环境下促进大学英语教学具有一定的理论指导意义。     

如何使网络和多媒体技术更好地服务于大学英语教学

网络和多媒体技术在大学英语教学中发挥着极其重要的作用,也是当前大学英语教学改革的需要。但是网络和多媒体技术辅助下的大学英语教学中仍存在一些问题,因此如何更好地发挥网络和多媒体技术在大学英语教学中的优势很重要。     

如何在英语教学中树立以人为本的思想

随着信息时代的发展,网络的普及,英语正日趋国际化,了解外国文化,培养人文素质,增强竞争意识,对大学英语教学提出了更高的要求。本文在分析了国内大学英语教学存在的问题的基础上,提出了如何在英语教学中树立以人为本思想的措施。     

大学英语微课教学创新模式研究—评《新编化学化工专业英语》

英语课是大学教学中的一门基础性课程,同时也是一门必修课,但是由于英语是一门外语,所以在教学当中还存在着一些问题,导致大学英语教学效果不是特别理想.进入信息化时代后,新媒体技术在高等教育中取得了广泛的应用,基于微课为大学英语教学模式进行改革和创新,符合信息化时代的要求,同时对于大学英语教学效果的提升也具有重要的推广价值和...     

跨文化交际型大学英语课堂模式构建

本文通过回顾英语教学流派的发展，说明了跨文化交际型大学英语课堂模式构建的必要性和必然性，并通过提出具体的方法，达到构建合理、可行的跨文化交际型大学英语课堂模式的目的。     

自媒体环境下大学英语教学初探

随着网络技术的不断发展,在我们生活、学习和工作中接触的自媒体工具越来越多,影响了我们的方方面面,逐渐成为我们日常生活中不可或缺的一部分。身处自媒体环境下的大学英语教学过程也发生了转变,并且逐渐向着人们所希望的方向发展。自媒体有着很多的优势,而这是鉴于自媒体技术的这些优势,自媒体在大学英语教学过程中扮演着越来越重要的角色。     

提高理工科大学生英语听说能力的有效途径--华东理工大学英语第二专业的教学设计及实践

本文结合大学英语教学现状,对照了<大学英语课程教学要求>和<英语专业英语教学大纲>,阐述了华东理工大学英语二专以专业教学模式为理工类学生提供四年不断线的高层次的英语教学的实践.我们突出听说能力和跨文化意识培养的教学模式所取得的成绩,指出了一条达到大学英语教学更高要求的有效途径.     

计算机多媒体技术与大学英语教学相结合路径探索

大学英语教学是大学生必修课程中的一部分,虽然大学英语教学工作已经进行了很多年,但是很多授课教师仍然以传统的教学方式为主,大大忽视了计算机多媒体技术在教学过程中的应用。计算机多媒体是很多高校硬件设施中不可或缺的一部分,但是真正能够实现大学英语教学与计算机多媒体相结合目标的高校很少。所以,必须对大学英语教学如何实现与计算机多媒体相结合的路径进行研究论述,为实现两者的有机结合提供理论基础。为此,本文首先对大学英语教学现状进行阐述,而后提出将大学英语教学过程与计算机多媒体技术相结合的策略。     

以大学英语四级考试促进教学

自国家教委颁布理工科英语教学大纲和在大学英语中实行四级统一考试以来,大学英语教学水平的教学质量有了长足提高。我     

理工科专业英语教学改革探讨

专业英语是大学英语教学的重要组成部分,但目前专业英语的教学由于重视不够,严重落后于基础英语的教学和全球化浪潮对新时代大学毕业生综合英语能力的需要。通过分析专业英语教学现状和存在问题,以教育部颁布的《大学英语教学大纲（修订版）》和《大学英语教学要求》为指导,探索了理工科专业英语教学在课程设置、教学内容、教学模式、师资队伍以及教学管理和考核等方面的改革措施,为深化专业英语教学改革提供依据。     

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。