提高实验教学效果探索

高等职业教育的特点是突出实验实训教学,为了得到较好的实践教学效果,文章就个人的工作经验结合我院的实验教学改革与实践成果,从教师综合素质、教学经验、教学模式等方面进行总结归纳。     

情景学习视角下眼视光技术实践教学的课程思政设计与实施——以“视力检查实践教学”为例

实践教学是高等职业教育院校眼视光技术专业教学中的重要组成部分,为解决人才综合实践能力不足的问题,将思政教育融入实践教学。以视力检查实践教学为例,在情景学习视角下设计“三师共建、三段育人”的课程思政教学案例,为实施眼视光技术专业实践教学提供参考。     

基于工作过程的高职化工实践教学改革探讨

文章阐述了高等职业教育特点,针对当前高职化工类专业实践教学存在的主要问题,并基于工作过程理念,富有成效地探讨了化工实践教学改革的一些思路,改变实践教学方式,考核方法等。     

关于高职院校几点教学改革的思考

高等职业技术教育要求把握好理论教学与实践教学的关系，探索适合培养目标的教学方法，综合运用多种教学方法，十分重视搞好实践教学，适度调整教材结构和测评方法，把教书与育人结合起来。     

高职实践环节教学过程评价指标体系的构建——以《化工产品合成》课程为例

工作过程导向的实践环节教学目标定位在工作过程所需职业技能的培养、所需职业素养的养成以及职业生涯发展所需素质的提高上。传统的教学评价手段已不能客观、全面评价这种教学模式的教学质量,因此亟需探索出一套既符合高等职业教育教学规律、又便于操作的实践教学环节的评价指标体系。本文以《化工产品合成》课程实践环节教学过程为例,探讨了其教学过程评价指标体系构建过程。     

高职化工专业课教学中行动导向教学体系的建构思考

德国是"行为导向"理念的起源国家,这一理念的成熟与发展为德国职业教育教学的指导思想,为德国职业教育的发展作出了巨大贡献。近几年来我国高等职业教育发展迅猛,高等职业教育教学方式也在改革当中。以高等职业教育教学中化工专业课的教学引进行为导向理念,分析行为导向教学体系在高职化工专业课教学中的构建。     

高等职业教育建筑装饰实践教学体系建设研究

随着科技和经济不断的发展,我国对高职教育越来越重视。高职教育是我国高等教育的重要部分,是为各类技术提供专业技术人才的重要渠道,所以高等职业教育显得越来越重要。在高等职业教育中,有关建筑装饰实践教学部分还需要做出调整,尤其是教学实践体系的建设问题。本文针对高等职业教育建筑装饰实践教学构建进行探讨,研究了如何开展建设环节,并提出一些意见。     

在《有机化学》课程中进行项目化教学实践后的思考

课程项目化教学改革是促使高等职业教育课程走向优质的一条有效途径,结合《有机化学》课程项目化教学改革实践,对在教学项目设施与实施、基于工作过程的教学情境构建、职教师资建设、教学资源建设与利用中出现的问题进行了思考,并初步提出了解决这些问题的对策。     

搞好高等职业技术学校教学工作思考

高等职业技术教育是改革开放以来中国高等教育的一项突破性的革命,据了解,我省高等职业教育学院在2003年将发展到20所,1999年职业高中招生将扩大到1万人。这是一个令人兴奋和鼓舞的形势。高等职业技术学院在教学上的思考主要集中在应如何突出高等职业教育的特点,寻找一条适合于高等职业技术教学的道路。教学是学校工作的重点,高等职业教育与传统的教育有较大的区别。我对教学工作的思考与设想主要从以下几个方面进行说明。 1 学校的培养目标 高等职业教育培养目标已经达成较为统一的看法,这主要集中于下列观点:     

浅析高职院校实践教学改革

本文分析了我国高等职业教育实践教学的现状,指出高职教育实现人才培养目标的有效途径,是高职教育实践教学改革和发展,同时也是社会经济发展对高职教育实践教学提出的客观要求。     

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。