教学课程资源库 更多>>

关键词： Solubility parameter   transport   rough hard-sphere   perturbed hard-trimmer chain   drug-like  

摘要： In this paper, density, solubility parameter and transport properties viscosity, thermal conductivity and diffusion coefficient at infinite dilution in water (diffusivity) of drug-like fluids including two groups have been calculated. We have studied the modified perturbed hard trimmer chain equation of state combined with statistical model and modified rough hard-sphere (RHS) theory to model the solubility parameter and transport properties of drug-like fluids for temperature ranging from 129.95 to 1090.15 K and atmosphere pressure. From 838 experimental data points examined, the average absolute relative deviation (AARD) of calculated density was found to be 1.05%. In the case of solubility parameter, the new statistical-based model correlated 234 experimental data points with AARD equal to 0.70%. RHS-based model has also been extended to calculated 601, 771 and 261 experimental data points of viscosity, thermal conductivity and diffusivity with AARD equal to 3.11%, 2.12% and 7.69%, respectively.

关键词： 电子能级   无机化学   物理化学   分子结构特征   量子限域效应   分子性质   绿色催化   多学科交叉  

摘要： 金属纳米团簇(MNC)是一类直径小于3 nm的超小纳米粒子,是当前无机化学、物理化学、材料科学等多学科交叉领域的研究前沿与热点.由于在这一超小尺度下受强量子限域效应影响,MNC表现出一系列与纳米晶体迥异的类分子性质,例如:离散的电子能级、强荧光、本征手性等,使其在绿色催化、清洁能源、智能传感以及生物医药等重要领域具有广阔的应用前景.除此之外,MNC还表现出类分子结构特征.

关键词： 课程思政   物理化学   爱国情怀   教学改革  

摘要： “立德树人”是高等教育的根本任务,思政教育能培养青年大学生树立正确的价值观。以近三年的《物理化学》课程教学实践为基础,举例说明《物理化学》课程的思政元素提炼,讨论了如何在授课教学环节有机融入课程思政内容。结果表明,思政元素的融入不仅能有效提高教学质量,更能激发学生的爱国热情,培养学生的辩证思维,有利于培养有理想、有素养的高素质人才。

关键词： 物理化学   雨课堂   教学改革   教学质量  

摘要： 物理化学是化工、化学和药学类专业基础课之一,将雨课堂这一智慧教学工具融入物理化学课程的教学过程中,可以有效提高教学质量。教师使用雨课堂课前发布预习材料,课上提供随堂测试,课下发布复习材料等可以提高物理化学的教学效果。同时要预防在雨课堂使用过程中带来的负面问题,如增加学生学习负担、影响课堂纪律等。

关键词： 土壤安全   重金属污染   修复方法   物理化学  

摘要： 土地污染是我国面临的重大问题,尤其是土壤重金属污染对土地资源的损害严重,可直接或间接对生态系统产生危害。笔者从重金属污染物来源及现状出发,对重金属的危害进行了阐述,并针对性地提出了应用物理、化学和生物方法对土壤重金属污染的修复,以期为污损土地修复工作尤其是重金属污染引发的各类生态问题提供一定参考。

关键词： 物理化学教学   翻转课堂   微课   双路径模式  

摘要： 面对物理化学难教难学、课时有限、学生数多等问题,本文基于翻转课堂理念、微课辅助手段、智慧教学工具,提出一种“理论-应用”双路径教学模式。该模式利用双课件强化提升知识的传授,采用阶梯式测验辅助理论和应用教学,根据教评反馈推动学生主动思考及解决问题能力的锻炼,在螺旋上升中实现“教-学-用”之集成。文章以电化学教学为示例,展示了这种模式的具体实施方法,旨在为类似课程教学质量的提升提供新的教学思路。

关键词： Hydrothermal carbonization   Blast furnace injection   Physicochemical structure   Combustion performance   Kinetics  

摘要： To improve the quality of low-rank coal to meet requirements of blast furnace, hydrothermal carbon-ization (HTC) was used to treat low-rank coal to analyze the change rule of physicochemical properties, structural characteristics and combustion performance. Results showed that with an increase in HTC temperature, the calorific value increased from 25.29 to 28.85 MJ/kg. The ash content dropped from 11.74 of raw coal to 7.16. In addition, the atomic ratio of O/C and H/C decreased from 0.21 to 0.79 to 0.12 and 0.56, respectively. Structural analysis revealed that the aromaticity was improved, but the aliphatic carbon content reduced. The coal property was closer to bituminous coal with medium metamorphic degree. The carbon ordering degree also increased, indicating an increase in energy density. Combustion and kinetic analyses showed that with an increase in HTC temperature, compared with raw coal, the combustion curve first moved to the low temperature zone and then gradually shifted to the high temperature zone. Furthermore, the comprehensive combustion characteristics were improved. And the burnout time, which had a certain relationship with ash removal, was shortened. The average reaction activation energies all showed a trend of increasing first and then decreasing, with a range between 114.2 and 147.6 kJ/mol. (c) 2021 Elsevier Ltd. All rights reserved.

关键词： 思维导图   物理化学   教学方法  

摘要： 本文阐述了思维导图在物理化学课程教学中的重要地位,并以绪论课和热力学第二定律知识体系的思维导图为例,介绍了思维导图的建立过程,通过实践取得了很好的教学效果。

关键词： Radionanoparticles   Luminescent nanoparticles   Lu2O3 nanoparticles   Sm2O3 nanoparticles  

摘要： This study synthesized peptide-functionalized Lu and Sm sesquioxide nanoparticles by precipitation-calcination (P-C) and pulsed laser ablation in liquids (PLAL) to evaluate their physicochemical properties after neutron activation. Nanoparticles were obtained by precipitation in an alkaline solution, followed by centrifugation, drying, calcination, and functionalization with peptides (three or eighteen amino acids). For the PLAL nanoparticle synthesis, tablets made of Lu2O3 and Sm2O3 powders were immersed in peptide solutions and laserirradiated (Nd:YAG) for 30 min, followed by ultracentrifugation as a purification process. The nanosystems were analyzed using transmission electron microscopy, high-resolution transmission electron microscopy, selected area electron diffraction, X-ray diffraction, differential scanning calorimetry-thermogravimetry, and FTIR and UV-Vis spectroscopies. Luminescence was evaluated after nanoparticle neutron activation using an optical imaging device (CCD camera). The Lu(2)O(3 )and Sm2O3 nanoparticles synthesized by P-C showed a quasispherical and well-defined morphology, with a monomodal and monodispersed size distribution (30.05-44.83 nm) and highly crystalline patterns (cubic m (3) over bar space group). In contrast, the micrographs of the Lu and Sm sesquioxide nanoparticles obtained by PLAL showed two distinct populations, namely, one of well-defined and dispersed spherical particles (62.35-75.02 nm), and the other of precursor material fragments without defined form or size (>2 mu m). The diffractograms of the PLAL synthesis products were wide and not well defined due to the amorphous material that was simultaneously produced with the crystalline nanoparticles, which affected the detection of luminescence. The nanosystems prepared by P-C were obtained in high yields (70% for Lu2O3 and 90% for Sm2O3) and with optimal physicochemical characteristics, significantly impacting the radio-luminescence properties of the nanoparticles (emissio

关键词： Soybean hull   Micronization   Gamma irradiation   Steam explosion   Physicochemical properties   In vitro digestibility  

摘要： The objective of this study was to compare the effects of the micronization (MT), steam explosion (SE), and gamma irradiation (GI) treatment on the chemical composition, structure, physicochemical properties, and in vitro digestibility of dietary fiber from soybean hulls. GI (1200 kGy) treatment exerted the optimum effects on improving soluble dietary fiber content, in vitro gross energy digestibility (IVGED), and reducing sugar yield (RS) in the three modification methods, increased by 342.88%, 55.24%, and 117.02%, respectively. Compared with GI treatment, MT-GI combined treatment could further enhance the degradation effect of irradiation and improve the physicochemical properties (p < 0.05) in soybean fibers. From the results of correlation analysis, RS was a significant positive correlation (p < 0.05) with IVGED, and RS = -112.24 + 4.90 x IVGED (r(2) = 0.82, p < 0.01). In summary, MT-GI combined treatment could be considered the ideal modification method to improve the quality of soybean fiber.