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根据以往的实验课教学经验,总结了应从完善实验课纲要和计划、做好实验课程的准备工作、要注重实验过程、教师必须有过硬的操作技术、采取灵活多样的实验考核形式和及时对实验课进行总结等方面去做,上好医疗美容技术实验课。 相似文献
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大学的物理实验课教学是培养适应现代化建设人才的重要环节,为了完成这样一个战略任务,需要实验教学工作者更新教育观念,深化实验课程体系和课程内容改革,改进实验课教学方法,加强实验课队伍的建设。本文围绕这一个战略任务,从实验内容、仪器设备、教学方法入手,提出了物理实验教学改革的几点思考。 相似文献
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电子政务作为公共管理专业应用技能类课程,其实验课的建设对于培养符合社会需求的复合型人才显得相当重要。针对现阶段以教为主,缺乏系统实验、实践设计的现状,论文探讨了电子政务实验课在教材建设、实验设计和师资力量知识结构方面存在的问题。通过案例分析构建了以优化传统电子政务实验平台运用为基础,以案例分析讨论为补充,以情景模拟实验、决策分析模拟实验为提升的多形式实验课框架;探讨建立电子政务实验与社会实践相互补充的模式;提出了以多学科互联、互动丰富实验内容为支撑,以紧贴需求,横纵联动拓展实验、实践为途径,以“新文科”建设为契机,完善实验软硬件设施、提升教师队伍素质为基础的产学结合、注重效益产出的电子政务实验课建设支持和发展策略。 相似文献
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化学实验教学是学生理解化学理论知识的关键,也是培养学生实际操作能力的重要手段,结合教学实践,提出要上好化学实验课,必须注意的几个关键环节:有计划地备好实验课;做好实验课前的准备工作;合理安排实验时间;实验操作中精心指导;实验课后及时总结. 相似文献
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培养学生的创新能力和自我学习能力是素质教育的其中一个重点。而培养创新能力就需要多引导学生去主动地思考问题并动手实验和验证。计算机实验课给学生提供了一个很好的思考、实验和验证的平台。文章结合计算机学科实验课的教学模式和教学方法,探讨了如何在计算机实验课中培养学生的创新兴趣,提出并分析了相应的教学方法及其发展趋势。 相似文献
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实验也课是计算机教学中的重要环节,为了能更好地指导计算机实验课教学,在计算机实验课教学基本方法的基础上提出了一种新思路--层次性的计算机实验课教学,并对其方法、原则、实施关键和优越性进行了分析和阐述. 相似文献
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通过对近几年我校非物理专业本科学生大学物理实验课学习兴趣的详细调查,发现学生对传统物理实验的兴趣明显下滑,而对半定量和定性实验、计算机仿真实验等表现出很高的学习积极性。对非物理专业物理实验课兴趣培养作了一些尝试,提出了一些新的教学改革设想。 相似文献
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本文简要分析了当今大学实验课的现状,针对传统实验预习存在的问题,提出了新的实验预习机制。结合二阶系统校正设计实验预习实例,介绍了实验原理和实验内容,应用Multisim分析了未校正系统的性能指标,设计了串联校正网络,通过Multisim仿真验证了校正后系统的性能完全满足设计要求。结论是新的实验预习机制锻炼了学生的自学能力,提高了实验课的效率。 相似文献
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樊宝元 《内蒙古科技与经济》2002,(8)
本文就物理实验教学中 ,影响做好实验的心理活动做了初步探讨 ,对这些心理因素的解决 ,将会提高学生对实验课的积极性 ,收到良好的实验课的教学效果 相似文献
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动物繁殖学实验是动物科学专业重要的基础课程,对培养学生的创新精神和实践能力起着十分重要的作用。通过对动物繁殖学实验内容的调整,将实验内容划分为两大模块：室内实验4个,室外实验3个。实验包括验证性实验、综合性实验、设计性实验和开放性实验,重点突出综合实验。实验重视设计性及创新性,引入多媒体辅助教学,并建立全面灵活的考核体系。通过这些改革措施,提高了学生的实验兴趣、增强了学生在实验中的主动性,培养了学生的创新能力。 相似文献
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张民觉是世界著名的生殖生理学家,一生致力于生殖生理学的实验研究,以科学实验为基础,为人类的生殖健康作出了卓越的贡献,被誉为＂试管婴儿之父＂和＂口服避孕药之父＂。在他的科学实验中,精巧地运用了科学选题、科学假设、对照比较、理论思维等方法,为他实验的成功起着至关重要的作用。对张民觉的科学实验及其方法进行深入的实证研究,在现今的生殖生理学研究领域中具有深远而广泛的借鉴意义。 相似文献
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《Information processing & management》2001,37(3):507-520
The results from a series of three experiments that used Text Retrieval Conference (TREC) data and TREC search topics are compared. These experiments each involved three novel user interfaces (one per experiment). User interfaces that made it easier for users to view text were found to improve recall in all three experiments. A distinction was found between a cluster of subjects (a majority of whom were search experts) who tended to read fewer documents more carefully (readers, or exclusives) and subjects who skimmed through more documents without reading them as carefully (skimmers, or inclusives). Skimmers were found to have significantly better recall overall. A major outcome from our experiments at TREC and with the TREC data, is that hypertext interfaces to information retrieval (IR) tasks tend to increase recall. Our interpretation of this pattern of results across the three experiments is that increased interaction with the text (more pages viewed) generally improves recall. Findings from one of the experiments indicated that viewing a greater diversity of text on a single screen (i.e., not just more text per se, but more articles available at once) may also improve recall. In an experiment where a traditional (type-in) query interface was contrasted with a condition where queries were marked up on the text, the improvement in recall due to viewing more text was more pronounced with search novices. Our results demonstrate that markup and hypertext interfaces to text retrieval systems can benefit recall and can also benefit novices. The challenge now will be to find modified versions of hypertext interfaces that can improve precision, as well as recall and that can work with users who prefer to use different types of search strategy or have different types of training and experience. 相似文献
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以羽毛为底物发酵产角蛋白酶培养基的优化 总被引：1，自引：0，他引：1
以角蛋白酶为考察指标,采用正交试验对以羽毛为底物,利用枯草芽孢杆菌菌株KD-N2生产角蛋白酶的培养基组成进行了优化试验.结果表明在NaCl含量为0.5 g/L,MgSO4含量为0.2 g/L,KH2PO4/K2HPO4含量为0.35/0.7 g/L时有利于角蛋白酶的产生,验证试验证明发酵24 h时角蛋白酶活性为(66.5±2.04)U/mL:各组发酵液pH值均呈上升趋势,发酵残留物重量也随发酵培养基组成不同而呈现一定的差异,表明以羽毛为底物发酵产角蛋白酶为一复杂过程.以天青角蛋白和酪蛋白为底物对酶活测定的结果表明了实验方法和结果的可靠性. 相似文献
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Alternating-current (AC) electrokinetics involve the movement and behaviors of particles or cells. Many applications, including dielectrophoretic manipulations, are dependent upon charge interactions between the cell or particle and the surrounding medium. Medium concentrations are traditionally treated as spatially uniform in both theoretical models and experiments. Human red blood cells (RBCs) are observed to crenate, or shrink due to changing osmotic pressure, over 10 min experiments in non-uniform AC electric fields. Cell crenation magnitude is examined as functions of frequency from 250 kHz to 1 MHz and potential from 10 Vpp to 17.5 Vpp over a 100 μm perpendicular electrode gap. Experimental results show higher peak to peak potential and lower frequency lead to greater cell volume crenation up to a maximum volume loss of 20%. A series of experiments are conducted to elucidate the physical mechanisms behind the red blood cell crenation. Non-uniform and uniform electrode systems as well as high and low ion concentration experiments are compared and illustrate that AC electroporation, system temperature, rapid temperature changes, medium pH, electrode reactions, and convection do not account for the crenation behaviors observed. AC electroosmotic was found to be negligible at these conditions and AC electrothermal fluid flows were found to reduce RBC crenation behaviors. These cell deformations were attributed to medium hypertonicity induced by ion concentration gradients in the spatially nonuniform AC electric fields. 相似文献
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科学探究,不仅限于课堂,课外实验同样可作为化学课堂的拓展和延伸。本文结合笔者的化学新课程教学实践,就初中化学课外实验的问题做一探讨,主要包括：化学实验的功能;课外实验的分类;化学课外实验的开展和设想几方面。 相似文献
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This paper discusses the results of a series of experimental investigations that have been conducted at The Johns Hopkins University on the effects of electric shock. Rats and dogs were used as the experimental animals. They were completely anesthetized before the experiments. Studies of the effects produced by electric current upon the nervous system and upon the heart are reported. Three types of circuits were used in the work, namely, direct current, alternating current, and the discharge of an impulse generator.In the first series of experiments, the effect of voltage was studied and it was found that low voltage alternating current circuits are much more deadly than direct current circuits of the same voltage. At voltages of 1,000 and higher the reverse is the case. In this work, the importance of the size of the animal as related to the injury was definitely established, larger animals being able to withstand a greater current than those small in size.The resistance offered by a body in an electrical circuit was determined. The resistance is made up of two parts—the contact resistance, and the ohmic resistance of the body proper. The resistances offered at the contacts are of the nature of a voltage drop and are largely independent of the current flowing. The importance of contact resistances in industrial accidents is emphasized.In a second series of experiments the effect of the current path through the 相似文献
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This paper describes our novel retrieval model that is based on contexts of query terms in documents (i.e., document contexts). Our model is novel because it explicitly takes into account of the document contexts instead of implicitly using the document contexts to find query expansion terms. Our model is based on simulating a user making relevance decisions, and it is a hybrid of various existing effective models and techniques. It estimates the relevance decision preference of a document context as the log-odds and uses smoothing techniques as found in language models to solve the problem of zero probabilities. It combines these estimated preferences of document contexts using different types of aggregation operators that comply with different relevance decision principles (e.g., aggregate relevance principle). Our model is evaluated using retrospective experiments (i.e., with full relevance information), because such experiments can (a) reveal the potential of our model, (b) isolate the problems of the model from those of the parameter estimation, (c) provide information about the major factors affecting the retrieval effectiveness of the model, and (d) show that whether the model obeys the probability ranking principle. Our model is promising as its mean average precision is 60–80% in our experiments using different TREC ad hoc English collections and the NTCIR-5 ad hoc Chinese collection. Our experiments showed that (a) the operators that are consistent with aggregate relevance principle were effective in combining the estimated preferences, and (b) that estimating probabilities using the contexts in the relevant documents can produce better retrieval effectiveness than using the entire relevant documents. 相似文献