浅谈物理教学与想象力的培养

想象力的培养是素质教育的一个重要方面,培养学生的想象力,造就开拓型、创造型的人才,是现代教育的主要目标之一。而物理学是一门概念性、逻辑性和系统性都很强的基础课程,在培养学生的想象力方面有其独到之处。本文基于上述背景,对想像力的本质特征及其意义进行分析,并结合教学实践,提出了在物理教学中培养学生的想像力的一些尝试和探索。     

Liquid-phase catalytic hydrogenation of furfural in variable solvent media

Water is the most abundant compound inherently existing in bio-oils. Thus understanding the role of water within bio-oils upgrading process is essential for future engineering scale-up design. In this study, furfural was chosen as bio-oils model compound, and the catalytic hydrogenation of furfural over commercial 5%, Ru/C catalyst was firstly investigated in a series of gradient variable water/ethanol mixture solvents. Water had a significant effect on the distribution of product yields. The dominant reaction pathways varied with the water contents in the water/ethanol mixture solvents. Typically, when ethanol was used as the solvent, the main products were obtained by the hydrogenation of carbonyl group or furan ring. When pure water was used as the solvent, the rearrangement reaction of furfural to cyclopentanone should be selectively promoted theoretically. However, serious polymerization and resinification were observed herein in catalytic hydrogenation system of pure water. The catalyst surface was modified by the water-insoluble polymers, and consequently, a relative low yield of cyclopentanone was obtained. A plausible multiple competitive reaction mechanism between polymerization reaction and the hydrogenation of furfural was suggested in this study. Characterizations(TG,FT-IR,SEM)were employed to analyze and explain our experiments.     

高职新生现状调研及其数据分析——以广东轻工职业技术学院为例

以广东轻工职业技术学院新生为研究对象,主要采用分层抽样调查法和深度个案访谈法,了解新生心理、人际关系、经济状况、学习、生活情况等。调研数据及其分析为高校学生工作创新发展提供参考。     

高校贫困大学生心理健康状况分析及对策

高校贫困生问题是不容回避的社会问题.在对贫困生进行生活上关心和经济上资助的同时,贫困生的心理健康状况也值得我们分析研究并寻求对策.本文首先分析高校贫困大学生的心理特点,其次剖析了贫困大学生心理特点成因,最后提出解决高校贫困大学生的"心理脱贫"对策.     

云南贫困山区农村剩余劳动力流动与减贫的实证分析——基于昭通市贫困山区的调查

农村剩余劳动力向城市地区的迁移日益普遍,贫困地区也不例外。利用对云南昭通市国家扶贫开发重点县的调查资料,分析劳动力流动与缓解贫困的关系。研究表明劳动力流动从总体上改善了贫困地区的贫困程度,这主要体现在劳动力流动在增加农民收入、减少贫困发生率、缓解人文贫困、提高农业劳动生产率、缓解农村生态贫困等方面都有显著影响。但同时也存在一些负面影响,需要相应的政策措施进行调整。     

崇左市小学科学课程教学现状调查研究

本文在对崇左市小学科学教育的现状进行调查的基础上,对调查结果进行了分析研究,提出了深化小学科学教育改革的一些设想。     

"模拟-实践"教学模式在中等职业学校的运用

"模拟—实践"教学模式包括创设模拟情境、分组讨论编排、现场模拟表演、评议讲解示范、巩固练习总结等环节。在具体应用过程中,要求学生主动合作、积极参与,教师要以激励为主,模拟情境要逼真,要有充分的教学准备和充足的课堂教学时间。     

分析中发现 探究中创新

本文通过对高等师范专科数学教育专业的《常微分方程》课程的教学过程分析,阐明了在高等师范专科数学教育专业教学过程中,要通过引导学生认真分析学习内容,探究因果关系,尝试自己定义问题,敢于公布自己的想法,勇于创新等教学方法改革。对优化师范专科数学教育学与教的方式,创新能力培养等教学问题进行了研究。     

Calculation of the Phase Equilibrium of CO_2–Hydrocarbon Binary Mixtures by PR-BM EOS and PR EOS

The phase equilibrium data of CO_2 –hydrocarbon binary mixtures are important for the design and operation of CO_2 flooding, coal liquefaction, and supercritical extraction processes. Numerous pieces of binary phase equilibrium data have been obtained. Thus, models for the accurate calculation of binary and multicomponent mixtures must be developed on the basis of existing data. In this work, 3578 vapor–liquid phase equilibrium data points for 10 CO_2 –hydrocarbon binary mixtures, including CO_2 –butane, CO_2 –pentane, CO_2 –isopentane, CO_2 –hexane, CO_2 –benzene, CO_2 –heptane, CO_2 –octane, CO_2 –nonane, CO_2 –decane, and CO_2 –undecane, were collected. The PR and PR-BM equations of state(EOS) in combination with relevant mixing rules were used to calculate the phase equilibrium data of the CO_2 –hydrocarbon binary mixtures. The binary interaction parameter k ij in the PR EOS was temperature independent, whereas parameters in the PR-BM EOS were functions of temperature. Thus, the phase equilibrium data and other thermodynamic properties of the binary and multicomponent mixtures at different temperatures and pressures can be calculated by using the parameters obtained in this work. The PR-BM EOS performed better than the PR EOS, and the average absolute deviations over the temperature range of 255.98–408.15 K calculated by the PR EOS and PR-BM EOS were less than 5.74% and 3.36%, respectively. The results calculated by the two EOS were compared with those calculated by other models, such as PPR78, PR + LCVM + UNIFAC, KIE + PR EOS + HV, and PSRK. The phase equilibrium data of CO_2 –butane–decane, CO_2 –hexane–decane, and CO_2 –octane–decane ternary mixtures were calculated by the two EOS. The average overall deviations for the CO_2 mole fractions calculated by the two EOS were less than 7.66%.     

浅谈大学物理协作学习模式的构建

大学物理作为一门基础学科,其涵盖的知识面非常广,不仅包括基础理论部分,如力学、热学、光学、电磁学及近代物理等,而且还有大量的实验操作部分．如一级物理实验、二级物理实验、近代物理实验等。其中有很多知识点与现实生活联系得比较紧密,涉及到许多应用领域,具有很强的实践操作性。高师院校大学物理可以为协作学习的开展提供很好的研究载体与研究内容。