“双一流”背景下复合材料与工程专业思政类“金课”建设
作者：
杨泛明;贺国文;刘赛文
期刊：
云南化工 ,2023年50(05):198-200 ISSN：1004-275X
作者机构：
湖南城市学院 材料与化学工程学院,湖南 益阳 413000;[杨泛明; 刘赛文; 贺国文] 湖南城市学院
关键词：
双一流;课程思政;金课;教学
摘要：
思政类“金课”建设是高等学校教学改革的重要环节。复合材料与工程专业为新工科专业，主要涉及复合材料设计、制备、表征与应用等内容，与国家科技发展关联性较强。“双一流”背景下，建设好复合材料与工程专业思政类“金课”,对教学质量的提升和应用型高校发展具有重要意义。从素材库、课程群、评价机制三方面对思政类“金课”建设进行了探讨。
语种：
中文
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Aqueous two-phase systems coupled with chemometrics-enhanced HPLC-DAD for simultaneous extraction and determination of flavonoids in honey
作者：
Zhang, Xiao-Hua* ;Qing, Xiang-Dong;Zheng, Jing-Jing;Yu, Yan;Huang, Jiaojiao;...
期刊：
Food Chemistry: X ,2023年19:100766 ISSN：2590-1575
通讯作者：
Zhang, Xiao-Hua;Liu, Z
作者机构：
[Zhang, Xiao-Hua; Liu, Zhi; Zhang, XH] Hunan Inst Sci & Technol, Dept Chem & Chem Engn, Yueyang 414006, Hunan, Peoples R China.;[Zhang, Xiao-Hua; Zheng, Jing-Jing; Yu, Yan] Xuchang Univ, Food & Pharm Coll, Henan Key Lab Biomarker Based Rapid Detect Technol, Xuchang, Peoples R China.;[Qing, Xiang-Dong] Hunan City Univ, Coll Mat & Chem Engn, Hunan Prov Key Lab Dark Tea & Jin Hua, Yiyang, Peoples R China.;[Huang, Jiaojiao; Liu, Zhi] Hunan Univ Humanities, Coll Agr & Biotechnol, Sci & Technol, Loudi, Peoples R China.;[Kang, Chao] Guizhou Univ, Sch Chem & Chem Engn, Guiyang, Peoples R China.
通讯机构：
[Liu, Z ; Zhang, XH] H;Hunan Inst Sci & Technol, Dept Chem & Chem Engn, Yueyang 414006, Hunan, Peoples R China.
关键词：
Honey;Flavonoids;Aqueous two-phase systems;Chemometrics;HPLC-DAD
摘要：
In this study, an accurate, rapid, green, and environment friendly method for the extraction and quantitative analysis of flavonoids in honey was established by using the aqueous two-phase extraction combined with the chemometrics-assisted HPLC-DAD. The first purpose of this study was to extract seven flavonoids in five different types of honey using alcohol/salt aqueous two-phase system (ATPS). The system with 2.82 mL sodium citrate (30%), 1.58 mL water, and 3.10 mL isopropanol, showed the highest flavonoids extraction yields in the top phase (87.66–101.50%). Additionally, the three-way array of honey samples based on HPLC-DAD was decomposed mathematically by the alternating trilinear decomposition (ATLD) algorithm to obtain reasonable chromatograms, spectra, and concentration profiles for each analyte. Compared with the traditional solid-phase extraction method, the ATPS-ATLD-based method showed satisfactory spiked recoveries, lower limit of detection, and higher sensitivity, further verifying its accuracy and stability. © 2023 The Authors
语种：
英文
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Near-Infrared Hemicyanine Fluorophores with Optically Tunable Groups: A 'Leap Forward' for in Vivo Sensing and Imaging
作者：
Huang, Jing;He, Long;Wang, Jiaoliang;Xu, Junchao* ;Yuan, Lin
期刊：
SYNLETT ,2023年35(01):21-28 ISSN：0936-5214
通讯作者：
Xu, Junchao;Yuan, L;Wang, JL
作者机构：
[Xu, Junchao; Yuan, Lin; Xu, JC; Huang, Jing; He, Long] Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Wang, Jiaoliang; Wang, JL] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Hunan, Peoples R China.
通讯机构：
[Xu, JC; Wang, JL ; Yuan, L ] H;Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Hunan, Peoples R China.
关键词：
near-infrared;fluorophore;hemicyanine;molecular probe;fluorescence imaging
摘要：
<jats:title>Abstract</jats:title><jats:p>Hemicyanine dyes, with a tunable optical site and high wavelength tailorability, are of significant importance in the fields of sensing and diagnosis. Following the discovery of the near-infrared (NIR) (650–900 nm) fluorescent dyes Changsha (CS) and Huda (HD) by our group, remarkable progress has been made in the development of hemicyanine-based probes for in vivo imaging and detecting. In this review, we summarize the key contributions made by our group in developing long-wavelength (650–1700 nm) hemicyanines and utilizing them to construct functional probes. Finally, potential drawbacks and future prospects of hemicyanine dyes/probes are discussed.</jats:p><jats:p>1 Introduction</jats:p><jats:p>2 Changsha (CS) Dyes</jats:p><jats:p>3 Huda (HD) Dyes</jats:p><jats:p>4 Construction of Hemicyanine Fluorophores in the NIR-II Region</jats:p><jats:p>5 Summary and Outlook</jats:p>
语种：
英文
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基于岗位要求分析“碳排放管理”融入环境工程专业课程体系路径的思考
作者：
黄毅;林立;彭映林;徐玲;李必才;...
期刊：
化工时刊 ,2023年37(04):82-84 ISSN：1002-154X
作者机构：
[黄毅; 林立; 彭映林; 徐玲; 李必才; 卿湘东] 湖南城市学院材料与化学工程学院
关键词：
碳排放管理;减污降碳;融入;路径
摘要：
“碳排放管理员”新职业在“碳达峰、碳中和”国家战略背景下应运而生。环境工程专业应抢抓发展新机遇,积极将“碳排放管理”融入环境工程专业课程体系,培养适应“减污降碳”生态环保工作新形势的专业人才,增强学生就业竞争力。在分析“碳排放管理”岗位知识、能力和情感要求的基础上,对“碳排放管理”融入环境工程专业课程体系的必要性进行了分析,提出了“碳排放管理”融入环境工程专业理论、实践和第二课堂课程体系的路径,从而形成“知识-能力-情感”三层次一体化人才培养体系。
语种：
中文
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波谱分析教学中核磁共振氢谱解析的教学设计
作者：
刘赛文;刘正;殷志红
期刊：
云南化工 ,2023年50(07):187-190 ISSN：1004-275X
作者机构：
[刘赛文; 刘正; 殷志红] 湖南城市学院材料与化学工程学院
关键词：
核磁共振氢谱;波谱分析;教学设计
摘要：
波谱分析课程是运用紫外光谱、红外光谱、核磁共振波谱和质谱等现代物理手段研究有机物化学结构的一门学科，其中核磁共振氢谱用于获取有机物结构中的氢原子的个数及种类。为了达到教学目标，在进行教学设计时，引入屠呦呦发现青蒿素的艰辛历程内容，培养学生不畏困难的科学探索精神；注重相关实例及其分析，将所学理论知识融入其中，培养了学生分析问题和解决问题的能力。
语种：
中文
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Shape-controlled synthesis of varied bismuth nanostructures and their size-dependent photocatalytic removal of organic dyes under visible light irradiation
作者：
Ma, Dechong* ;Pan, Sai;Tan, Mingjun;He, Guowen;Zhao, Jingzhe
期刊：
Optical Materials ,2023年145:114433 ISSN：0925-3467
通讯作者：
Ma, Dechong;He, GW
作者机构：
[Ma, Dechong; Pan, Sai; Ma, DC; He, Guowen; Tan, Mingjun] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.;[Zhao, Jingzhe] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.
通讯机构：
[Ma, DC; He, GW ] H;Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.
关键词：
Absorption spectroscopy;Bismuth;Bismuth compounds;Catalyst activity;Chlorine compounds;Dyes;Fourier transform infrared spectroscopy;Irradiation;Morphology;Nanoparticles;Nanorods;pH;Photodegradation;Photoelectrons;Photons;Rhodium compounds;Scanning electron microscopy;Synthesis (chemical);X ray photoelectron spectroscopy;Bismuth nanoparticles;Bismuth nanostructure;Grainsize;Micro sphere;Morphologies-controlled synthesis;Nanocubes;Organic dye;pH value;Photocatalytic activities;Visible-light irradiation;Photocatalytic activity
摘要：
The catalytic activity of photocatalyst is strongly dependent on the phase structures, grain size and particle morphology of the catalyst. In this paper, the controlled synthesis of bismuth(Bi) with different morphologies (nanoparticles, nanorods, nanocubes and micro-spheres) has been successfully realized by adjusting different experimental parameters. The Bi nanostructures were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET), photoluminescence (PL), UV–vis absorption spectroscopy (UV–Vis). The PL spectra shown that the reduction of the size of Bi nanomaterials can decrease the recombination rate of photoelectrons and holes, which leads to the effective separation of photocharge carriers and the better photocatalytic performance of Bi nanomaterials. The energy gaps of Bi nanoparticles, nanorods, nanocubes and microspheres are 2.57 eV, 2.69 eV, 2.99 eV and 3.16 eV respectively. The degradation activity of Bi nanostructures with different sizes on organic dyes showed that 99.9%, 98.9%, 97% and 68.3% degradation of RhB was observed after 90-min visible light irradiation for Bi nanoparticles (20–50 nm), nanorods (20 nm in diameter and 1 μm in length) nanocubes (150–200 nm) and micro-spheres (10 μm), respectively. The results indicated that if the grain sizes of the Bi samples are reduced from micro-size to nano-size, their catalytic activities dramatically increase. At the same time, the achieved results also reveal that Bi2O3 and BiOCl were found in Bi surfaces before and after catalytic degradation, which was confirmed by XPS and FTIR technology. In addition, the catalytic activity of Bi with the same morphology increased with the decrease of pH value. Furthermore, the Bi samples still retained excellent catalytic activity after 40 cycles, the removal rate could also reach 73.5% for the 40th cycling. © 2023 Elsevier B.V.
语种：
英文
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Discrimination of the harvesting season of green tea by alcohol/salt-based aqueous two-phase systems combined with chemometric analysis
作者：
Zhang, Xiao-Hua;Cui, Hui-Na;Zheng, Jing-Jing;Qing, Xiang-Dong;Yang, Kai-Long;...
期刊：
Food Research International ,2023年163:112278 ISSN：0963-9969
通讯作者：
Xiao-Hua Zhang<&wdkj&>Xiao-Li Yin
作者机构：
[Zhang, Xiao-Hua; Zhang, Ya-Qian; Pan, Le-Yuan; Zheng, Jing-Jing; Yang, Kai-Long; Ren, Lu-Meng] Xuchang Univ, Food & Pharm Coll, Henan Key Lab Biomarker Based Rapid detect Technol, Xuchang 461000, Peoples R China.;[Cui, Hui-Na; Yin, Xiao-Li] Yangtze Univ, Coll Life Sci, Jingzhou 434023, Peoples R China.;[Qing, Xiang-Dong] Hunan City Univ, Coll Mat & Chem Engn, Hunan Prov Key Lab Dark Tea & Jin Hua, Yiyang 413049, Peoples R China.
通讯机构：
[Xiao-Hua Zhang] H;[Xiao-Li Yin] C;College of Life Sciences, Yangtze University, Jingzhou 434023, China<&wdkj&>Henan Key Laboratory of Biomarker Based Rapid-detection Technology for Food Safety, Food and Pharmacy College, Xuchang University, Xuchang 461000, PR China
关键词：
Aqueous two-phase systems;Chemometrics;Green tea;HPLC-DAD;Harvesting season
摘要：
The flavor and aroma quality of green tea are closely related to the harvest season. The aim of this study was to identify the harvesting season of green tea by alcohol/salt-based aqueous two-phase system (ATPS) combined with chemometric analysis. In this paper, the single factor experiments (SFM) and response surface methodology (RSM) optimization were designed to investigate and select the optimal ATPS. A total of 180 green tea samples were studied in this work, including 86 spring tea and 94 autumn tea. After the active components in green tea samples were extracted by the optimal ethanol/(NH 4 ) 2 SO 4 ATPS, the qualitative and quantitative analysis was realized based on HPLC-DAD combined with alternating trilinear decomposition-assisted multivariate curve resolution (ATLD-MCR) algorithm, with satisfactory spiked recoveries (86.00 %–112.45 %). The quantitative results obtained from ATLD-MCR model were subjected to chemometric pattern recognition analysis. The constructed partial least squares-discriminant analysis (PLS-DA) and orthogonal partial least squares-discriminant analysis (OPLS-DA) models showed better results than the principal component analysis (PCA) model, and the R 2 X cum values (>0.835) and R 2 Y cum (>0.937) were close to 1, the Q 2 cum values were greater than 0.75 (>0.933), and the differences between R 2 Y cum and Q 2 cum were not larger than 0.2, indicating excellent cross-validation prediction performance of the models. Furthermore, the classification results based on the hierarchical clustering analysis (HCA) were consistent with the PCA, PLS-DA and OPLS-DA results, establishing a good correlation between tea active components and the harvesting seasons of green tea. Overall, the combination of ATPS and chemometric methods is accurate, sensitive, fast and reliable for the qualitative and quantitative determination of tea active components, providing guidance for the quality control of green tea.
The flavor and aroma quality of green tea are closely related to the harvest season. The aim of this study was to identify the harvesting season of green tea by alcohol/salt-based aqueous two-phase system (ATPS) combined with chemometric analysis. In this paper, the single factor experiments (SFM) and response surface methodology (RSM) optimization were designed to investigate and select the optimal ATPS. A total of 180 green tea samples were studied in this work, including 86 spring tea and 94 autumn tea. After the active components in green tea samples were extracted by the optimal ethanol/(NH 4 ) 2 SO 4 ATPS, the qualitative and quantitative analysis was realized based on HPLC-DAD combined with alternating trilinear decomposition-assisted multivariate curve resolution (ATLD-MCR) algorithm, with satisfactory spiked recoveries (86.00 %–112.45 %). The quantitative results obtained from ATLD-MCR model were subjected to chemometric pattern recognition analysis. The constructed partial least squares-discriminant analysis (PLS-DA) and orthogonal partial least squares-discriminant analysis (OPLS-DA) models showed better results than the principal component analysis (PCA) model, and the R 2 X cum values (>0.835) and R 2 Y cum (>0.937) were close to 1, the Q 2 cum values were greater than 0.75 (>0.933), and the differences between R 2 Y cum and Q 2 cum were not larger than 0.2, indicating excellent cross-validation prediction performance of the models. Furthermore, the classification results based on the hierarchical clustering analysis (HCA) were consistent with the PCA, PLS-DA and OPLS-DA results, establishing a good correlation between tea active components and the harvesting seasons of green tea. Overall, the combination of ATPS and chemometric methods is accurate, sensitive, fast and reliable for the qualitative and quantitative determination of tea active components, providing guidance for the quality control of green tea.
语种：
英文
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基于产教融合背景下分析化学实践类课程教学的优化研究
作者：
刘蓉;张子彤;齐风佩;刘石泉;钟桐生;...
期刊：
化工时刊 ,2023年37(06):56-59 ISSN：1002-154X
作者机构：
湖南城市学院材料与化学工程学院,湖南益阳 413000;[齐风佩; 王立勤; 刘蓉; 钟桐生; 刘石泉; 张子彤] 湖南城市学院
关键词：
分析化学;实践类课程;产教融合;企业;优化教学
摘要：
本科生的分析化学实践类课程教学应注重强调解决实际生产问题时的原理性及应对实际难题的实用性,以便学生能够解决检测样品时遇到的难题.作者针对分析化学实践类课程教学的基本特点,通过与相关企业有机融合,从依照产业需求、利用企业场地、依托产业技术和根据产业标准几方面出发,介绍了理论联系实际的教学模式的实施及其效果,以达到夯实理论基础、强化动手能力、激发创新思维和提升工作技能的目的,并为基于产教融合、校企合作背景下地方本科院校分析化学实践类课程教学的优化提供新的思路.
语种：
中文
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A comprehensive review of the current trends and recent advancements on the authenticity of honey
作者：
Zhang, Xiao-Hua;Gu, Hui-Wen;Liu, Ren-Jun;Qing, Xiang-Dong;Nie, Jin-Fang
期刊：
Food Chemistry: X ,2023年19:100850 ISSN：2590-1575
通讯作者：
Zhang, XH;Nie, JF
作者机构：
[Zhang, Xiao-Hua; Zhang, XH] Hunan Inst Sci & Technol, Dept Chem & Chem Engn, Yueyang, Peoples R China.;[Zhang, Xiao-Hua] Xuchang Univ, Food & Pharm Coll, Key Lab Biomarker Based Rapid Detect Technol Food, Xuchang, Peoples R China.;[Gu, Hui-Wen] Yangtze Univ, Coll Chem & Environm Engn, Jingzhou, Peoples R China.;[Nie, Jin-Fang; Nie, JF; Liu, Ren-Jun] Guilin Univ Technol, Coll Chem & Bioengn, Collaborat Innovat Ctr Water Pollut Control & Wate, Guilin, Peoples R China.;[Qing, Xiang-Dong] Hunan City Univ, Coll Mat & Chem Engn, Hunan Prov Key Lab Dark Tea & Jin Hua, Yiyang, Peoples R China.
通讯机构：
[Nie, JF ] G;[Zhang, XH ] H;Hunan Inst Sci & Technol, Dept Chem & Chem Engn, Yueyang, Peoples R China.;Guilin Univ Technol, Coll Chem & Bioengn, Collaborat Innovat Ctr Water Pollut Control & Wate, Guilin, Peoples R China.
关键词：
Honey;Authenticity;Analytical methods;Sample extraction techniques;Chemometrics
摘要：
The authenticity of honey currently poses challenges to food quality control, thus requiring continuous modernization and improvement of related analytical methodologies. This review provides a comprehensively overview of honey authenticity challenges and related analytical methods. Firstly, direct and indirect methods of honey adulteration were described in detail, commenting the existing challenges in current detection methods and market supervision approaches. As an important part, the integrated metabolomic workflow involving sample processing procedures, instrumental analysis techniques, and chemometric tools in honey authenticity studies were discussed, with a focus on their advantages, disadvantages, and scopes. Among them, various improved microscale extraction methods, combined with hyphenated instrumental analysis techniques and chemometric data processing tools, have broad application potential in honey authenticity research. The future of honey authenticity determination will involve the use of simplified and portable methods, which will enable on-site rapid detection and transfer detection technologies from the laboratory to the industry.
语种：
英文
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净味剂对橡胶沥青的影响研究
作者：
殷传峰;马德崇
期刊：
山西交通科技 ,2023年(5):1-3 ISSN：1006-3528
作者机构：
[殷传峰] 山西省交通科技研发有限公司;湖南城市学院材料与化学工程学院;[马德崇] 湖南城市学院
关键词：
橡胶沥青;净味剂;非甲烷总烃;硫化氢
摘要：
橡胶沥青作为一种较为理想的环保路面材料,其在有效解决废旧轮胎污染问题的同时具有提升道路使用性能的有益效果,因而在国内外得到了较多应用。但橡胶沥青在制备及施工过程中较重的气体污染物排放问题一直是制约其更广泛应用的因素之一。...展开更多 橡胶沥青作为一种较为理想的环保路面材料,其在有效解决废旧轮胎污染问题的同时具有提升道路使用性能的有益效果,因而在国内外得到了较多应用。但橡胶沥青在制备及施工过程中较重的气体污染物排放问题一直是制约其更广泛应用的因素之一。研究制备出外掺25%的橡胶沥青,分析了净味剂加入橡胶沥青前后的主要技术指标、气体污染物排放情况,并研究了作用机理。试验结果显示,所加净味剂在不显著影响橡胶沥青相关技术指标情况下,明显改善气体污染物的排放情况。该研究成果可为橡胶沥青绿色环保化应用提供借鉴和指导。收起
语种：
中文
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“学、问、思、践”一体化的分析化学课程思政“金课”教改探索
作者：
祝小艳;钟桐生;贺国文;夏莉;李媛
期刊：
当代教育实践与教学研究 ,2023年(8):168-170 ISSN：2095-6711
作者机构：
[夏莉; 祝小艳; 钟桐生; 李媛; 贺国文] 湖南城市学院材料与化学工程学院
关键词：
“学、问、思、践”;分析化学;课程思政;金课
摘要：
课程思政视域下，秉承“以学生为主体”的教学理念，强化问题情境教学，加强理论与实践的结合。从教学模式、教学设计、课程思政、过程化考核四个维度对分析化学课程教学进行改革，打造“学、问、思、践”一体化的分析化学课程思政“金课”。课程的一系列改革极大程度上激发了学生内在学习动力，为培养兼具扎实学识、过硬能力和良好素养的应用型人才奠定了坚实的基础。
语种：
中文
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(R)-1-(3-(二苄基甲基氨基)-2-羟丙基)-1-甲基哌啶碘化铵的合成与应用
作者：
张劲;胡拥军;彭天英;刘赛文
期刊：
湖南城市学院学报(自然科学版) ,2023年32(02):68-72 ISSN：1672-7304
作者机构：
[张劲; 胡拥军; 彭天英; 刘赛文] 湖南城市学院材料与化学工程学院
关键词：
合成;手性胺醇;手性季铵盐;不对称催化
摘要：
首先,以二苄胺和(R)-环氧氯丙烷为原料合成了(R)-3-二苄胺基-1,2-环氧丙烷,再与哌啶反应合成了(R)-1-二苄胺基-3-哌啶基-2-丙醇(ligand 1),并研究了ligand 1诱导二乙基锌对苯甲醛的对映选...展开更多 首先,以二苄胺和(R)-环氧氯丙烷为原料合成了(R)-3-二苄胺基-1,2-环氧丙烷,再与哌啶反应合成了(R)-1-二苄胺基-3-哌啶基-2-丙醇(ligand 1),并研究了ligand 1诱导二乙基锌对苯甲醛的对映选择性加成反应;其次,用(R)-1-二苄胺基-3-哌啶基-2-丙醇和碘甲烷反应合成了(R)-1-(3-(二苄基甲基氨基)-2-羟丙基)-1-甲基哌啶碘化铵(ligand 2),同时研究了ligand 2在不对称相转移催化反应中的应用,并利用核磁共振对上述产物进行了表征.试验结果显示,上述手性配体均具有一定的不对称诱导效果.收起
语种：
中文
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不同条件下聚酰胺6复合材料的摩擦磨损性能
作者：
王利俊;游一兰;贺国文;叶媛;肖阳
期刊：
工程塑料应用 ,2023年51(05):110-115+152 ISSN：1001-3539
作者机构：
[王利俊; 游一兰; 贺国文; 叶媛; 肖阳] 湖南城市学院材料与化学工程学院材料系
关键词：
聚酰胺6;摩擦磨损;水润滑;油润滑;载荷;转速
摘要：
为探究聚酰胺6(PA6)在不同工况条件下的摩擦磨损性能,采用MMX-2型摩擦磨损试验机研究了水润滑和油润滑条件下纳米二氧化硅(nano-SiO2)含量、载荷、转速对PA6摩擦磨损性能的影响规律。结果...展开更多 为探究聚酰胺6(PA6)在不同工况条件下的摩擦磨损性能,采用MMX-2型摩擦磨损试验机研究了水润滑和油润滑条件下纳米二氧化硅(nano-SiO2)含量、载荷、转速对PA6摩擦磨损性能的影响规律。结果表明:载荷为60 N,转速200 r/min的条件下,nano-SiO2能降低PA6的摩擦系数和质量磨损率,且同等条件下,油润滑时具有更好的摩擦磨损性能。考察了载荷和转速对PA6/nano-SiO2(质量分数为5%)复合材料摩擦磨损性能的影响,结果表明,水润滑条件下:摩擦系数随载荷和转速的增大先减小后增大,质量磨损率随载荷增大先增大后减小、随转速增大却先减小后增大,磨损机理表现为黏着磨损和磨粒磨损。油润滑条件下:摩擦系数受载荷影响不大、随转速的增大先减小后增大,质量磨损率随载荷增大而降低、随转速增大而增大,摩擦表面以犁沟分布为主,属犁沟磨损机制。收起
语种：
中文
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Metal- and Solvent-Free Synthesis of Substituted Pyrimidines via an NH4I‑Promoted Three-Component Tandem Reaction
作者：
Fang, Fang;Xia, Jie;Quan, Siying;Chen, Shanping* ;Deng, Guo-Jun
期刊：
JOURNAL OF ORGANIC CHEMISTRY ,2023年88(20):14697-14707 ISSN：0022-3263
通讯作者：
Chen, Shanping;Deng, GJ
作者机构：
[Quan, Siying; Fang, Fang; Xia, Jie; Chen, Shanping; Deng, Guo-Jun; Chen, SP; Deng, GJ] Xiangtan Univ, Key Lab Green Organ Synth & Applicat, Key Lab Environm Friendly Chem & Applicat, Coll Chem,Minist Educ Hunan Prov, Xiangtan 411105, Peoples R China.;[Fang, Fang] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.;[Deng, Guo-Jun; Deng, GJ] Henan Normal Univ, Sch Chem & Chem Engn, Xinxiang 453007, Peoples R China.
通讯机构：
[Chen, SP; Deng, GJ ] X;Xiangtan Univ, Key Lab Green Organ Synth & Applicat, Key Lab Environm Friendly Chem & Applicat, Coll Chem,Minist Educ Hunan Prov, Xiangtan 411105, Peoples R China.;Henan Normal Univ, Sch Chem & Chem Engn, Xinxiang 453007, Peoples R China.
关键词：
Aromatic compounds;Dimethylformamide;Solvents;Dimethyl acetal;Gram-scale synthesis;Metal-free conditions;Metal-free synthesis;N-N-dimethylformamide;Simple++;Solvent free conditions;Solvent free synthesis;Tandem reaction;Three-component;Ketones;acetal;aliphatic ketone;functional group;ketone;n,n dimethylformamide;pyrimidine derivative;quinazoline derivative;Article;controlled study;derivatization;methodology;reaction analysis;reaction temperature;synthesis
摘要：
A facile and practical approach for the preparation of substituted pyrimidines from ketones, NH4OAc, and N,N-dimethylformamide dimethyl acetal has been described. This NH4I-promoted three-component tandem reaction affords a broad range of substituted pyrimidines in acceptable yields under metal- and solvent-free conditions. The present methodology features the advantages of simple and easily available starting materials, metal- and solvent-free conditions, a broad substrate scope with good functional group tolerance, and gram-scale synthesis. © 2023 American Chemical Society.
语种：
英文
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认证背景下《波谱分析》课程教学体系的构建
作者：
刘赛文;刘正;陈超
期刊：
云南化工 ,2023年50(02):183-185 ISSN：1004-275X
作者机构：
湖南城市学院材料与化学工程学院,湖南 益阳 413000;[刘正; 刘赛文; 陈超] 湖南城市学院
关键词：
工程教育专业认证;波谱分析;教学体系
摘要：
《波谱分析》是化工、药学和材料等专业的必修课程,如何使学生真正掌握课程知识并能学以致用是教学的关键.在工程教育专业认证背景下,对《波谱分析》课程的教学进行了改革,并从修订大纲、打造常态化的O2 O教学平台、改革课程教学模式、构建合理的评价体系等方面进行了阐述.
语种：
中文
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多维校正辅助激发-发射矩阵荧光法快速定量及动力学分析土壤中9-羟基芴
作者：
曾庆斌;胡婷;刘添鑫;姜浪;安蓉;...
期刊：
中国科学.化学 ,2023年53(6):1020-1030 ISSN：1674-7224
作者机构：
[曾庆斌; 胡婷; 刘添鑫; 姜浪; 安蓉; 张劲; 卿湘东] 湖南城市学院材料与化学工程学院,黑茶金花湖南省重点实验室
关键词：
9-羟基芴;多环芳烃;交替惩罚三线性分解;交替惩罚四线性分解;荧光;土壤
摘要：
9-羟基芴(9-OHF)是一种常见的多环芳烃类环境有机污染物.本文提出了一种基于交替惩罚三线性分解(APTLD)和交替惩罚四线性分解(APQLD)的多维校正与三维荧光技术相结合的新策略,用于快速定量和动力学分析土壤样中9...展开更多 9-羟基芴(9-OHF)是一种常见的多环芳烃类环境有机污染物.本文提出了一种基于交替惩罚三线性分解(APTLD)和交替惩罚四线性分解(APQLD)的多维校正与三维荧光技术相结合的新策略,用于快速定量和动力学分析土壤样中9-OHF.选取因子数(F)为5和6,采用基于APTLD的三维校正方法分析拓展的三维数阵,所得土壤样中9-OHF平均回收率分别为(117.6±5.6)%和(111.1±5.1)%,半衰期分别为126.0和111.8 min,但T检验表明其预测值存在显著性差异.接着,采用基于APQLD的四维校正方法解析四维数阵.选取F=5和6,所得土壤样中9-OHF平均回收率分别为(107.8±10.6)%和(104.5±10.3)%,半衰期分别为121.6和105.0 min,T检验表明其预测结果准确可靠.此外,APQLD还给出了较好的选择性和更低的检测下限.结果表明基于APQLD的四维校正方法具有“高阶优势”,通过对四维数阵的唯一性分解,可提供准确可靠的结果,为研究复杂体系分析物的动力学过程提供了一种很有潜力的分析手段.收起
语种：
中文
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A novel wavelength interval selection based on split regularized regression for spectroscopic data
作者：
Huang, Xin;Xia, Li
期刊：
Journal of Mathematical Chemistry ,2023年61(4):877-892 ISSN：0259-9791
通讯作者：
Xin Huang
作者机构：
[Huang, Xin] Hunan City Univ, Management Sch, Yiyang 413000, Peoples R China.;[Xia, Li] Hunan City Univ, Sch Chem & Environm Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Xin Huang] M;Management School, Hunan City University, Yiyang, People’s Republic of China
关键词：
Split regularized regression;Wavelength interval selection;Partial least squares;Near-infrared spectroscopy
摘要：
Wavelength selection has become a critical step in the analysis for near-infrared (NIR) spectroscopy with high co-linearity and large number of spectral variables. In this study, a novel wavelength interval selection method based on split regularized regression and partial least squares (SplitReg-PLS) is developed. SplitReg-PLS is a two-step approach, which combines the advantage of the SplitReg and PLS methods. SplitReg presents interesting properties, which can split the variables into groups and pool the regularized estimation of the regression coefficients together as groups. The PLS regression is one of the most popular methods for multivariate calibration, and is performed on the selected group variables by using the SplitReg. The SplitReg-PLS method can automatically select successive strongly correlated and interpretable spectral variables related to the response, which provides a flexible framework for variable selection. The performance of the proposed procedure is evaluated by three real NIR datasets. The results indicate that SplitReg-PLS is a good wavelength interval selection strategy. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
语种：
英文
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Different shape-controlled synthesis and catalytic property studies on bismuth nanomaterials
作者：
Ma, Dechong* ;Pan, Sai;Tan, Mingjun;He, Guowen;Zhao, Jingzhe
期刊：
Materials Chemistry and Physics ,2023年310:128454 ISSN：0254-0584
通讯作者：
Ma, Dechong;He, GW
作者机构：
[Ma, Dechong; Pan, Sai; Ma, DC; He, Guowen; Tan, Mingjun] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.;[Zhao, Jingzhe] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.
通讯机构：
[Ma, DC; He, GW ] H;Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.
关键词：
Absorption spectroscopy;Bismuth;Bismuth compounds;Catalysis;Catalyst activity;Chemical oxygen demand;Chlorine compounds;Efficiency;Energy gap;Fourier transform infrared spectroscopy;Morphology;Nanoparticles;Nanowires;Optical properties;pH;Photodegradation;Photoelectrons;Photons;Scanning electron microscopy;Synthesis (chemical);Bi nanostructure;Catalysis degradations;Controlling agent;Morphologies-controlled synthesis;Nanoplates;pH value;Recombination rate;Rhodamine-B;Shuttle-like structures;Total Organic Carbon;X ray photoelectron spectroscopy
摘要：
Bi with four different morphologies (zero-dimensional (0D) nanoparticles, one-dimensional (1D) nanowires, two-dimensional (2D) nanoplates, and three-dimensional (3D) shuttle like structures) was successfully synthesized by changing the synthetic conditions. The Bi nanostructures were characterized in terms of structure, morphology, surface characteristics, optical properties and catalytic activity using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET), photoluminescence (PL), UV–vis absorption spectroscopy (UV–Vis) and total organic carbon (TOC) analyzer techniques, respectively. The PL spectra is shown that the reduction of the size of Bi nanomaterials can reduce the recombination rate of photoelectrons and holes, which leads to the effective separation of photocharge carriers and the lowest photoelectron and hole recombination rates. The band gap values of Bi nanoparticles, nanowires, nanoplates and shuttle like structures are 2.71 eV, 2.76 eV, 2.92 eV and 3.22 eV respectively, favouring the harvesting of visible-light. The experimental results of the degradation performance of Bi with different morphologies exhibited that 99.9%, 97.9%, 96.2% and 74.4% degradations of the Rhodamine B (Rh B) was observed for Bi nanoparticles, nanowires, nanoplates and shuttle like structures, respectively. During the degradation of RhB, with the prolongation of treatment time to 90 min, the highest removal rates of chemical oxygen demand (COD) and TOC was 73.5% and 68.4%, respectively. According to TOC analysis, more than 68% of the carbon in the dyes will produce CO2 products. The removal efficiency is attributed to the production of ·O2−, ·OH and h+ and their mineralization to RhB. At the same time, the achieved results also reveal that Bi2O3 and BiOCl was found in Bi surfaces before and after catalytic degradation, which was confirmed by XPS and FTIR technology. In addition, Bi with the same morphology performed different catalytic activities in Rh B solution with different pH values. It was found that the degradation efficiency increased evidently when the pH value decreased. The mechanism of Bi photocatalytic activity was proposed based on the results of product analysis, radical capture and XPS analysis. © 2023 Elsevier B.V.
语种：
英文
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改性磷钨酸及其在生物柴油合成中的催化活性研究
作者：
王立勤;唐钰;王锋;曹文秀
期刊：
湖南城市学院学报(自然科学版) ,2023年32(05):73-78 ISSN：1672-7304
作者机构：
[王立勤; 唐钰; 王锋; 曹文秀] 湖南城市学院材料与化学工程学院
关键词：
催化;磷钨酸;油酸;酯化反应
摘要：
采用改变焙烧温度的方式，制备不同酸量、结构的改性磷钨酸催化剂，研究其在生物柴油合成反应中的催化活性，并建立催化剂活性与性质的关系；利用X射线衍射仪和傅里叶变换红外光谱仪对催化剂的结构进行表征，采用间接滴定法对催化剂的总酸量进行表征，以甲醇和油酸的酯化反应为模型反应合成生物柴油﹒结果表明：1)随着焙烧温度的增加，催化剂酸量呈先增加后减小趋势；当焙烧温度为300℃时，磷钨酸酸量达最大值5.63 mmol/g；当焙烧温度小于等于500℃时，磷钨酸依然保持Keggin结构，且随着焙烧温度的提高，结晶度下降；当焙烧温度达600℃时，磷钨酸分解为产物WO3，其酸量仅为0.29 mmol/g﹒2)随着催化剂酸量的增加，其在油酸酯化反应中的催化活性提高，且当焙烧温度为300℃时，改性的磷钨酸催化活性最高﹒3)单因素优化试验结果表明，当催化剂用量为2 wt.%，醇油比为10：1，反应温度为90℃，反应时间为3 h时，油酸转化率达最大值97.2%﹒
语种：
中文
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Submicron Ti(C,N)-based cermets with improved microstructure using high-energy milled and subsequent heat-treated ultrafine Ti(C,N) powders
作者：
Xie, Dan;Shang, Kepeng;Yi, Zhonghuai;Xiong, Huiwen;Li, Zhiyou;...
期刊：
Ceramics International ,2023年49(3):4064-4073 ISSN：0272-8842
通讯作者：
Gan, Xueping(ganxueping@csu.edu.cn);Xiong, Huiwen(huiwenxiong@csu.edu.cn)
作者机构：
[Gan, Xueping; Xie, Dan; Zhou, Kechao; Li, Zhiyou; Xiong, Huiwen; Shang, Kepeng; Yi, Zhonghuai] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.;[Xie, Dan] Hunan City Univ, Coll Mat & Chem Engn, All Solid State Energy Storage Mat & Devices Key L, Yiyang, Peoples R China.
通讯机构：
[Huiwen Xiong; Xueping Gan] S;State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China
关键词：
Ti(C;N)-based cermet;High energy milling;Ultrafine;Core -rim grain
摘要：
Ti(C,N)-based cermets with ultrafine or submicron black core-rim grains are attracting candidates for high-quality tools and dies, due to their high hardness and strength. However, high chemical activity of ultrafine Ti(C,N) powders lead to the increased instability and difficulty to control the sintering process, since the denitrification and interface diffusion are accelerated during the solid-state reaction. Based on this, owing to the unrealized commercial ultrafine-grade powders, ultrafine Ti(C,N) powders with an average grain size around 150 nm, low oxygen content and few dislocations are fabricated via the high-energy ball milling and subsequent heat treatment of commercial micron Ti(C,N) powders. Related morphology evolution, microstructure and composition of the ultrafine Ti(C,N) powders are investigated. Dense submicron Ti(C,N)-based cermets with grain size of 0.62 μm and uniform core-rim phases are successfully prepared by using the as-fabricated ultrafine Ti(C,N) powders. Compared to cermets via the conventional high-energy milling route, submicron Ti(C,N)-based cermets exhibit higher hardness of 1750 ± 40 N/mm2, bending strength of 1960 ± 135 MPa, and satisfactory fracture toughness of 9.2 MPa m1/2, owing to smaller grain size, uniform microstructure and partial black core-rim grains. © 2022
语种：
英文
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