健康安全环境(HSE)概论课程的混合式教学探索

在工程教育专业认证背景下,将混合式教学模式引入化工类课程有利于提升课程的教学质量。文章在阐述混合式教学模式的内涵、探讨混合式教学模式优势的基础上,以健康安全环境(HSE)概论课程为例,提出了混合式教学模式应用于化工类课程教学中的思路,以期为相关课程教学提供借鉴。     

基于混合式教学的无机化学课程改革与实践

通过分析大一学生对无机化学课程的学习现状以及混合式教学的优势,对无机化学课程进行混合式教学改革。对无机化学的部分内容进行了在线课程开发,线下采用多种教学方式教学的混合式教学,课程采用多元化的考核方式。经过对无机化学课程的混合式教学改革与实践,学生的课堂参与度与思考的深度得到了提升,期末考核区分明显。     

线上线下混合式教学在储运施工课程中的应用

随着信息技术的发展,线上线下混合式教学成为有效利用网络教学资源、丰富课堂教学方式、提升学生学习效果的有效手段。以油气储运工程施工课程建设为例,分析了线上线下混合式教学模式的内涵,构建了混合式教学的策略设计,探讨了课程实施情况和效果。实践证明,采取线上线下混合式教学获得了学生的普遍认可,对油气储运工程施工课程教学质量具有良好促进作用。     

《玻璃工艺学》混合式教学的几点体会

基于网络教学平台的混合式教学融合了课堂教学和网络教学两种教学模式的优势,是课程发展及改革的尝试性探索。本文结合《玻璃工艺学》课程混合式教学的开展就混合式教学的理解、网络资源建设、教学设计等方面谈了几点体会。     

现代学徒制背景下校企"双导师"混合式课程的教学探索与实践 ——以《煤化学》课程为例

现代学徒制"双导师"混合式课程的实施,实现了教学目标与产业需求的对接.以《煤化学》课程为例,从"双导师"混合式课程设计、"双导师"教学分工与"双导师"教学评价等方面,探索了现代学徒制背景下校企"双导师"混合式课程的实践,重点介绍了校内教师与企业导师共同完成课程教学的实施过程.     

《医用化学》课程混合式教学的探究

探讨混合式教学在《医用化学》课程中的应用及效果。阐明了在医用化学课程中引入混合式教学的必要性。从教学资源设计、数字资源建设、课堂教学、学习活动及教学评价等方面入手,进行了线上+线下的混合式教学。混合式教学满足学生的个性化学习的需求,学生学习积极性显著提高,教学质量得到了提升。此教学模式可为《医用化学》教学提供新的方法和思路。     

《化工原理》线上线下混合式教学模式的探索及实践

在当前高等学校一流本科课程建设的教育改革背景下,建设具有地方高校专业特色的线上线下混合式一流课程具有重要的实用价值。作者在化工类专业课程“化工原理”的教学实践中通过建立线上线下混合式课程的一体化教学体系,多种教学方法的综合运用,在实际的教学过程中进行了混合式教学模式的探索和实践。论文列举了混合式教学模式的过程、实施结果,分析了部分知识点的教学方法和教学特色。     

课程学习中心网络资源的混合式教学研究

基于课程学习中心的网络资源和基于翻转课堂的混合式教学,是高等教育在互联网时代课程教学改革的热点。基于课程学习中心网络资源的混合式教学实践,通过课程学习中心在线统计功能及时了解学生的在线学习情况等,以学生为本,分层次教学,以学生在课程学习中心的主观体验为主,为基于翻转课堂的混合式教学设计等提供基础数据。     

“高分子化学”混合式教学模式探索与实践

分析了郑州大学材料科学与工程学院《高分子化学》课程教学中传统模式遇到的痛点难点问题,并介绍了混合式教学模式引入《高分子化学》课程后的改革实施情况,包括线上线下资源的综合运用、课堂教学活动的适度翻转、教学软件辅助教学和过程评价等方面,总结了混合式教学过程中关系到教学效果提升和教学目标达成的四个核心方面,对混合式教学模式在材料类专业课程教学中的推广应用具有参考价值。     

专业认证背景下工程材料及成形课程教学改革

混合式教学模式将传统课堂和慕课学习的优势相结合,能够实现“线上”与“线下”课程的优势互补,提升了教学活动的灵活性。基于工程认证要求提出的“以学为中心”原则,本文以“工程材料及成形”课程为例,通过对课程基本情况和教学目标的分析,探讨了混合式课程建设中需要解决的关键问题,依据线上线下教学的建设思路,从课程资源建设、教学环节设计和课程考核评价方面,提出了混合式教学的改革思路与措施。     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

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.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009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、环氧树脂、不饱和聚酯树脂)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。     

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.     

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.     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.