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关键词： 物理化学   课程思政   教学改革  

摘要： 在推进新时代思想政治工作改革攻坚时期,课程思政创新改革也在逐步推进。项目组结合化学专业基础必修课物理化学的课程思政优质课程改革,探讨了物理化学知识体系中的思政元素,介绍了物理化学课程思政教学改革的具体措施和特色。初步改革效果表明,物理化学课程思政创新改革可以促进物理化学教学、提高教学效果和加强学生的思想政治修养。

关键词： DNA结合蛋白   物理化学性质   图形表示法   特征选择   支持向量机  

摘要： DNA结合蛋白在细胞内外的各种活动中起着重要作用。本文提出一种新的DNA结合蛋白预测方法(grDNA-Prot),使用20个氨基酸组成频率和基于AAindex数据库531个氨基酸物理化学性质的图形表示法描述蛋白质序列信息。此外,还采用三种特征选择方法来选择最优特征,并通过5折交叉验证,建立了基于支持向量机的DNA结合蛋白识别预测模型。为验证该方法的有效性,本文在独立测试数据集上与其他方法进行了比较。这些结果表明,Hydrophobicity (H)、Physicochemical properties (P)和Alpha and turn properties (A)是有效区分DNA结合蛋白和非DNA结合蛋白的主要氨基酸物理化学性质。

关键词： 新冠肺炎   中国传统文化   物理化学   教学设计  

摘要： 2020年新冠肺炎引发的疫情在全球蔓延。不同文化和观念在这场疫情中不断发生碰撞和交流,也引发人们对价值观的重新考量。在人类命运联系空前紧密的时代,在传统价值体系遭受争议和考验的时刻,文章立足于物理化学这门专业基础核心课程,围绕如何在大学课堂教学中贯穿社会主义核心价值观和中华文化的优秀传统,进行了深入的反思,并对课程模式进行了探讨。

关键词： MnFe2O4 solid nanospheres   Peroxymonosulfate activation   Pam-nitrophenol oxidation   n-C-7 asphaltene oxidation  

摘要： Manganese ferrite solid nanospheres (MSNs) were prepared by a solvothermal method and calcined at various temperatures up to 500 degrees C. Their surface area, morphology, particle size, weight change during calcination, surface coordination number of metal ions, oxidation state, crystal structure, crystallite size, and magnetic properties were studied. The MSNs were used as catalysts to activate potassium peroxymonosulfate (PMS) for the oxidative degradation of para-nitrophenol (PNP) from water and for the oxidation of n-C-7 asphaltenes in flowing air at atmospheric (0.084 MPa) and high pressure (6 MPa). Mn was in oxidation states (II) and (III) at calcination temperature of 200 degrees C, and the crystalline structure corresponded to jacobsite. Mn was in oxidation states (III) and (IV) at 350 degrees C and in oxidation states (II), (III), and (IV) at 500 degrees C, and the crystalline structure was maghemite at both temperatures. MSN catalysts generated hydroxyl (HO center dot) and sulfate (SO4 center dot-) radicals in the PMS activation and generated HO center dot radicals in the n-C-7 asphaltene oxidation. In both reactions, the best catalyst was MSN calcined at 350 degrees C (MSN350), because it has the highest concentration of Mn(III) in octahedral B sites, which are directly exposed to the catalyst surface, and the largest total and lattice oxygen contents, favoring oxygen mobility for Mn redox cycles. The MSN350 sample reduces the decomposition temperature of n-C-7 asphaltenes from 430 to 210 degrees C at 0.084 MPa and from 370 to 200 degrees C at 6.0 MPa. In addition, it reduces the effective activation energy by approximately 77.6% in the second combustion (SC) region, where high-temperature oxidation reactions take place.

关键词： 环境   物理化学   教学   改革  

摘要： 物理化学课程作为环境类课程中的一门基础课,在培养环境类人才、解决环境问题中发挥着至关重要的作用.因此,顺应环境类物理化学的课程特点,针对其教学现状中的不足进行改革十分必要.在进行课程教学时,教师应注意知识的连贯性与各章节间的衔接,教学与科研实践的结合,该课程与环境类其他课程的交叉及教学方法的改革.在进行课程学习时,学生应端正学习态度,紧跟课程进度,课后多做习题,并结合实际巩固提升.通过教学实践,在考核制度改革方面可安排小型测试、设置综合实践与期末测试.通过以上改革,使环境类物理化学课程在培养环境类人才、解决环境问题中更好地发挥作用.

关键词： Biocomponents   Harvest   Sugars   Acidity   Physico-chemical quality   Sensorial quality  

摘要： 'Tango' mandarin is becoming one of the most demanded varieties in the Mediterranean Region. However, no information on the quality of 'Tango' fruit in this citrus area has been reported. In this study, the physicochemical, nutritional and sensorial quality of 'Tango' mandarins grafted onto Carrizo Citrange and FA5 root-stocks from two locations (Sevilla and Huelva) was evaluated by harvest season. The fruit from Sevilla exhibited lower levels of acids and sugars than those from Huelva, which was associated with a higher sandy soil percentage in the Huelva orchard. In both orchards, the FA5-produced fruit had higher sugars and acids. Flavonoids were affected mainly by location, and the Huelva fruit exhibited the highest levels. The highest vitamin C was for the FA5 fruit. The decreased antioxidant capacity observed throughout the harvest season was related to reduced vitamin C. The sensorial evaluation corroborated changes in the quality parameters.

关键词： Phosphate   REEs   Waste   Clay   Environment  

摘要： The daily growing demand for critical materials has further highlighted the importance of secondary sources such as industrial waste streams. Waste clay, a phosphate ore process tailing, contains a remarkable amount of critical materials such as P and REEs so that comparing to different phosphate ore process streams, waste clay presents the highest concentration of REEs after phosphate rock. Due to the enormous volume of this waste accumulated in Florida to date, this reserve can satisfy a great portion of U.S. domestic demand for REEs, as an example. However, due to its troublesome nature, this reserve poses severe environmental problems along with economic loss. Two required attempts are the removal of extremely fine-sized clays, followed by the recovery of phosphate content, which can pave the path for the recovery of REE-bearing phases. Different possible remedies or combination of them have been considered by various research/ industrial trials, including froth flotation, selective-flocculation, floc-flotation, cycloning, gravity separation, magnetic separation, leaching, etc., most of which have shown no promising solution because of failing to address economic and of course environmental concerns. Moving from mostly chemical separation processes to the primarily physical/ physicochemical processes with low operational costs and environmental impacts could be a general solution. This requires detailed mineralogical and elemental characterization, physicochemical, rheological, electrochemistry, surface chemistry, crystal chemistry, solution chemistry, and quantum chemistry investigations on each single and then mixed phase systems composing waste clay. Such insights can help develop the fundamental knowledge, upon which more versatile and efficient solutions can be established.

关键词： 物理化学AISEC   项目教学   分析和改进  

摘要： 本文设计了ISEC物理化学翻转课堂教学模式,并就考核点小组项目环节进行了设置和分析。对化学工程与工艺专业ISEC物理化学教学过程中,项目部分的分数、对应大纲位置、考核方法和细则、结果分析和项目改进。为进一步探索和提高ISEC物理化学教学水平提供了相应的参考和经验。

关键词： Artificial neural network   Extrusion   Gluten free   Ready to eat   Protein addition   Response surface methodology  

摘要： Novel raw banana and defatted soy composite extrudates were formulated to combat celiac enteropathy. The influence of four independent parameters viz. barrel temperature (BT: 60-80 degrees C), screw speed (SS: 200-300 rpm), moisture content (MC: 10-20%, wb), and defatted soy flour content (SFC: 0-32%) on physicochemical properties of extrudates were evaluated. Response surface methodology (RSM) identified the optimum extrusion conditions (80 degrees C BT, 200 rpm SS, 10% MC, and 32% SFC). Compared to RSM (R-2:0.379-0.918), artificial neural network (R-2 :0.909-0.991) proved as a better tool for response prediction. Scanning electron microscopy confirmed the antagonistic effect of SFC addition on extrudate porosity. The addition of SFC decreased the crystallinity of the starch granules (71 to 49%), whereas, storage time had a positive effect (49 to 53%) on crystallinity of the composite extrudates. Fourier transform infrared spectroscopy analysis elucidated the secondary structures of protein in the composite flour which were degraded during the extrusion cooking.

关键词： 物理化学   MOOC   课程思政   三阶段教学模式  

摘要： 为实现全方位育人目标,借助MOOC教学新阵地,积极挖掘物理化学课程中蕴含的思政元素,对物理化学MOOC课程思政进行了探索和实践。文中列举了物理化学与哲学思维、走近化学家、赏古诗学物化、学物化倡环保等课程思政的实例并实践了"导学-研学-思学"三阶段物理化学MOOC课程思政教学新模式,从而促进学生思想道德和课程教学质量的全面提升。