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关键词： 化学教学   物理化学   电化学   电极反应  

摘要： 提出酸碱条件下电极反应书写的策略,对电池反应式和设计电池具有高度普适性,而且简单、快捷、容易操作,有利于学生对电化学知识的理解及提升学生学习物理化学的兴趣。

关键词： 物理化学实验   地沟油   电导率   电容   分光光度   凝固点  

摘要： 介绍了一个综合型物理化学实验:地沟油的鉴定。地沟油的鉴定用电导率法、电容法、分光光度法以及凝固点等四种方法来进行,这四种方法都能够显著地判断油质量的好坏。该实验来源于实际生活,是有机化学实验操作、电化学、结构化学和热力学等理论知识的综合应用。综合实验有效增强了学生对物理化学实验课程的学习兴趣,提高了学生的综合操作能力、创新能力和应用能力。

关键词： 课程思政   物理化学   映射数据库   辩证唯物主义   社会主义核心价值观  

摘要： 《高温物理化学》是冶金工程专业本科生的专业基础课。课程思政是高校教师立德树人的关键环节。从《高温物理化学》知识的哲理性特点出发,系统挖掘了该课程有关辩证唯物主义的思政元素,建立了"专业知识点-思政映射点"数据库。通过课程思政,使学生对物理化学知识的学习与思政内容的学习相互促进、共同提升,引导学生掌握物理化学知识的同时亦形成辩证唯物主义世界观。

关键词： Myofibrillar proteins   Microwave combined with air convection thawing   Protein properties   Tertiary structure   Moisture migration  

摘要： The effect of microwave combined with air convection thawing (MAT) on the properties and tertiary structure of myofibrillar proteins (MPs) from porcine longissimus dorsi muscle was investigated and compared with single treatments (air thawing, microwave thawing) and fresh meat (FM). Among the thawing treatments, the carbonyl content, dityrosine content, and surface hydrophobicity of MPs in MAT were the lowest, whereas the total sulfhydryl content, water-holding capacity, and Ca2+-ATPase activity were the highest, suggesting that MAT retained MPs properties better. MAT possessed a more stable tertiary structure and exhibited slight changes in MPs aggregation and degradation. There was an insignificant difference (P > 0.05) in the immobilized water and free water between the MAT samples and FM, indicating a tighter interaction between water and muscle protein in MAT. Thus, MAT could retain the physicochemical and structural properties of MPs, which provided a combination of thawing treatments for application in meat industry.

关键词： Adsorption   Synthesis   Zeolite   Degradation   TiO_(2)   Crystal   violet  

摘要： Different preparation routes for TiO_(2)-supported natural and synthetic clinoptilolite(TiO_(2)/CP)composites were thoroughly investigated on the basis of sol-gel,hydrothermal,and in-situ hydrothermal *** micro-structural features and physicochemical properties of resultant TiO_(2)/CPs were characterized via X-ray diffraction patterns,scanning(transmission)electron microscope images,Fourier transform infrared spectra,inductively coupled plasma-optical emission spectrometry methods,BET-isotherms,UV-visible spectra,and surface charge potential *** results showed that in-situ hydrothermal method led to well dispersions of loaded-TiO_(2) particles on the surface of leaf-like CP,while obviously aggregated TiO_(2) on a relatively distorted structure of CP was obtained using sol-gel and hydrothermal *** adsorptive and photocatalytic efficiencies for removal of crystal violet(CV)dye in aqueous solution were also explored under *** results demonstrated that TiO_(2)/CPs synthesized via sol-gel and in-situ hydrothermal methods presented the excellent performances with 98% removal efficiencies as compare to the bare commercial TiO_(2) which achieved 53%removal of CV ***,the in-situ hydrothermally synthesized TiO_(2)/CPs were the best due to their moderate energy cost,highest adsorption capacities and removal ***,the synthetic CPs as supports exhibited synergetic photocatalytic activities for the degradation of CV dye,which is attributed to their high surface areas,better adsorption capability,and fine dispersion of TiO_(2) *** and degradation kinetics of CV dye were found to follow the pseudo-second and pseudo-first order models,respectively.

关键词： OBE   物理化学   课堂主导  

摘要： 在OBE(Outcome-Based Education)模式下,确认课堂主导将是授课的关键。我国的工科物理化学课堂有不同于其他工科课程的特点,教师对课堂的主导需要更多的条件。

关键词： Pumpkin seed oil   Polyunsaturated fatty acids   Tocopherol   Low energy emulsification   Oil-in-water nanoemulsions   Long-term storage  

摘要： We present the chemical composition, quality parameters and antioxidant capacity of pumpkin seed oils (PSO) from Cucurbita pepo, Cucurbita maxima, and Cucurbita moschata cultivated in Brazil. In addition, PSO nano emulsions (nanopepo, nanomax and nanomosc) were developed and their physical stabilities were assessed under long-term storage at two temperatures. Among the PSO, C. pepo presented the highest contents of polyunsaturated fatty acids, total carotenoids, and chlorophylls, but the lowest oxidative stability. Conversely, C. maxima PSO showed highest oxidative stability and total tocopherol content but the lowest chlorophyll content. Nanomax and nanopepo were more stable to droplet growth at 4 degrees C, while nanomosc was more stable at 25 degrees C. Nanopepo was the most stable formulation after the heating-cooling cycles, whereas nanomax was the most stable under centrifugation regardless the temperature. Overall, all nanoemulsions presented droplet diameter lower than 200 nm and zeta-potential approaching-30 mV until the end of storage.

关键词： 浓缩液   垃圾渗沥液   回灌   混凝   蒸发  

摘要： 浓缩液是生活垃圾渗沥液处理时膜分离过程产生的二次污染物,其含有大量难降解有机物、重金属以及无机盐。本文重点讨论了物理化学处理技术对浓缩液中污染物去除效果及各处理技术的优缺点,本论文可为浓缩液的科学管理提供参考。

关键词： 物理化学实验   教学改革   创新思维  

摘要： 目前,学生在学习过程中缺乏对课程实验的重视和关注,缺乏自主学习、深入思考的习惯,缺乏主观能动性,只是单纯地模仿操作而无独立思考能力。针对《物化学实验》课程的特点,结合多年教学实践经验,对物化学实验教学改革进行了思考和探索。教学实践中,根据实验类型制定具体的教学方案,进行综合研究和探究式深入的实验教学改革,采用多元立体化教学模式,以生活实例和前沿科研成果促进学生的学习。引导学生进行自主、合作的探究学习,促进学生创造性思维的形成。

关键词： 物理化学实验   MATLAB   混合编程   网络信息系统   实验数据评价  

摘要： 应用MATLAB软件和***混合编程,构建评价学生物理化学实验结果的平台,具有重要的现实意义。本文以物理化学实验"最大泡压法测定溶液的表面张力"和"电导法测定乙酸乙酯皂化反应速率常数"为例,探讨了所构建网络系统在评价实验结果中的应用。该系统不仅能对实验数据进行分析和计算,还能直观地绘制出相应的图形,从而方便学生在完成实验后快捷、客观、准确地评价所获得的实验数据,有效提升了物理化学实验的质量。