《有机分析》课程模块式教学初探

随着职业教育的不断发展,老的教学模式已经不能适应现代教学的需要,教学改革势在必行。本文从模块化教学出发,分析了模块化教学的内涵,介绍了在有机分析课程中实施模块化教学的过程,探讨了实施模块化教学的效果与问题。     

基于国际视野的机械应用课程模块化混合教学模式的探索与实践

课程模块化设计,是为了便于模块化教学,集中时间系统地培训人才的某些特定技术技能。本文从机电人才培养体系和模块化教学的要求出发,以一门制图课程为例,阐述了课程目标的规划、课程体系的优化,最终形成机械应用模块的架构;展示了该模块的教学组织与实施流程,并举例说明了模块化课程的实施过程;给出了线上课程的考核实施办法和技术技能人才评价的双轨模型;最后对模块化混合式教学模式的应用效果进行了分析。实践表明,这一教学模式能有效实现国际技术技能人才的培养目标。     

《油气储运自动化》模块化教学模式探索

信息技术在教育领域的广泛应用,催生了线上教育的快速发展,疫情期间,各地教育部门积极响应教育部号召,对线上教学实践进行了积极有效的探索,促使线上教学模式发生了根本转变,本文以翻转课堂教学模式实践了线上教学,以此为契机,探讨了线上线下混合式模块化教学模式在职业教育实践类课程中的应用,试图使线上线下混合式模块化教学模式常态化...     

《毒物分析》模块化多层次实验课程体系的构建

将模块化多层次教学模式用于毒物分析实验课程体系建设,构建由基础型、提高型和研究型实验为内涵的多层次、模块化实验课程体系。模块化多层系教学模式在该课程教学中的实施,将会极大的提高学生学习兴趣与主动性,提高教学质量,进而培养出适应能力强、具有创新精神的公安特色专业人才     

公安院校《毒物分析》模块化多层次教学体系的构建

将模块化多层次教学模式用于公安院校《毒物分析》课程教学体系建设,通过课程体系建设、立体化教学资源建设和实验课程构建等环节的改革,实现模块化多层次教学模式,提高教学效率,整体优化该课程,使其成为具有公安特色的个性化课程。     

高职院校“建筑与装饰工程预算”课程模块化教学的几点辨析

在高职院校教学中,传统的教学模式已不能适应现代发展的需要,教学改革也呈现多样化。本文就"建筑与装饰工程预算"模块化教学的教学改革出发,从课程性质,课程设计以及模块化教学的实现条件等几个方面对模块化教学进行了分析。     

谈化工节能技术课程模块式的改革

模块化教学模式方便学生根据知识点的难易程度以及学习需求进行规划和学习,并且,也可以满足不同层次学生的学习要求。本文主要是对化工节能课程模块化改革进行了综合的分析,提炼出了化工节能课程模块式改革的必要性,并对其优点进行了简单的阐述。     

民族院校化学专业英语课堂与网络结合的教学模式探索

对我校化学专业英语教学现状进行了分析,结合化学专业英语的特点和教学经验,提出采用课堂教学和网络教学相结合的教学模式,并着重对网络教学模式进行了分析.按照模块化方式开发网络教学网站,依托校园网来实现化学专业英语的网络教学,作为课堂教学的空间和时间的扩展,以达到丰富教学模式,提高教学效果的目的.     

课程重组与模块教学模式的探讨

从职业教育的培养方向、模式要求等方面，阐述了课程重组，即课程整合与模块化教学在高等职业教育中的地位、作用。对机电技术应用专业的课程整合、模块化教学模式从整合的依据、整合的要求、模块的划分、专业能力要求的设定、师资、设备配备、教材的编写等方面进行了探讨。     

信息化背景下《化工原理》模块化教学的实践探索

通过构建《化工原理》模块化课程体系,借助信息化教学手段和资源,采用"理—虚—实"模块化教学模式实施教学过程,有效解决了高职院校生源结构发生变化之后,《化工原理》课程理论和实践分步实施过程中存在的问题,提升了课堂的教学质量,强化了学生的基本理论知识,也增强了学生的实践能力。     

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.     

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.     

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。     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。     

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.     

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.