Novel orange–red emitting phosphor Sr8ZnY(PO4)7:Sm3+ with enhanced emission based on Mg2+ and Al3+ incorporation for plant growth LED lighting
作者：
Zhou, Nan;Gao, Peixing;Yang, Yimei;Zhong, Yuan* ;Xia, Mao;...
期刊：
Journal of the Taiwan Institute of Chemical Engineers ,2019年104:360-368 ISSN：1876-1070
通讯作者：
Zhong, Yuan;Zhou, Zhi
作者机构：
[Xia, Mao; Zhong, Yuan; Zhou, Zhi; Zhang, Ye; Yang, Yimei; Zhou, Nan; Gao, Peixing] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Zhang, Ye; Yang, Yimei; Zhong, Yuan; Zhou, Nan; Gao, Peixing; Zhou, Zhi] Hunan Prov Engn Technol Res Ctr Opt Agr, Changsha 410128, Hunan, Peoples R China.;[Tian, Yun; Lu, Xiangyang] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Zhong, Y; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Activation energy;Citrus fruits;Emission spectroscopy;High temperature applications;Light emitting diodes;Phosphors;Solid state reactions;Thermodynamic stability;Chromaticity coordinates;Concentration quenching;Concentration-dependent;Diffuse reflection spectra;Excitation and emission spectra;High temperature solid-state reaction;Internal quantum efficiency;Plant growth;Light emission
摘要：
In this paper, a series of novel orange-red emission phosphors Sr8ZnY(PO4)(7):Sm3+ (SZYP:Sm3+) were synthesized by high-temperature solid-state reaction. The photoluminescence and concentration-dependent properties of this phosphor were investigated carefully through diffuse reflection spectra, excitation and emission spectra, Commission Internationale de l'Eclairage (CIE) chromaticity coordinate and decay times. SZYP:Sm3+ could be efficiently excited by n-UV and blue lights which center at 318, 345, 363, 376, 401, 410, 440 and 475 nm, respectively. The characteristic orange-red emission peaking at 563, 601 and 647 nm had been detected, which should be attributed to the characteristic f-f forbidden transition of Sm3+. The internal quantum efficiency (IQE) of ideal phosphor of SZYP:0.09Sm(3+) reached as high as 47%. In addition, The concentration quenching mechanism and thermal stability of SZYP:Sm3+ were further investigated. It was found SZYP:Sm3+ can maintain 93% of initial emission intensity at 150 degrees C and the corresponding activation energy was calculated to be 0.26 eV based on Arrhenius formula. The emission intensity of 1.0Mg(2+) and 0.02Al(3+) incorporated SZYP:0.09Sm(3+) reached up to 134% and 117% of the initial value, respectively. Moreover, (light-emitting diodes) LED devices were fabricated by employing the optimized samples as orange-red component with 365 nm n-UV chips. The desired emission in plant absorption region and extremely high thermal stability imply that SZYP:Sm3+ is suitable for the application in plant growth LED lighting. (C) 2019 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
语种：
英文
展开
Carbon-based materials as adsorbent for antibiotics removal: Mechanisms and influencing factors
作者：
Xiang, Yujia;Xu, Zhangyi;Wei, Yuyi;Zhou, Yaoyu* ;Yang, Xiao;...
期刊：
Journal of Environmental Management ,2019年237:128-138 ISSN：0301-4797
通讯作者：
Zhou, Yaoyu;Yang, Jian
作者机构：
[Xu, Zhangyi; Wei, Yuyi; Xiang, Yujia; Yang, Yuan; Yang, Jian; Zhou, Yaoyu; Zhang, Jiachao; Zhou, YY; Yang, J; Luo, Lin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Xu, Zhangyi; Wei, Yuyi; Xiang, Yujia; Yang, Yuan; Yang, Jian; Zhou, Yaoyu; Zhang, Jiachao; Luo, Lin] Hunan Agr Univ, Hunan Int Sci & Technol Cooperat Base Agr Typ Pol, Changsha 410028, Hunan, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhou, Yaoyu; Yang, Xiao] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China.
通讯机构：
[Zhou, YY; Yang, J] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.
关键词：
Activated carbon;Activated carbon treatment;Amides;Antibiotics;Environmental technology;Organic pollutants;Sulfur compounds;Water pollution;Adsorption mechanism;Adsorption process;Antibiotic removal;Biochar;Carbon based materials;Carbonaceous materials;Influencing factor;Removal mechanism;Soil and water;Soil environment;Adsorption;activated carbon;adsorbent;antibiotic agent;carbon;carbon nanotube;chloramphenicol;graphene;quinoline derived antiinfective agent;sulfonamide;tetracycline derivative;antiinfective agent;carbon nanotube;charcoal;graphite;activated carbon;adsorption;antibiotics;carbon;carbon nanotube;factor analysis;organic pollutant;pollutant removal;adsorption kinetics;Article;process optimization;waste component removal;adsorption;water pollutant;Adsorption;Anti-Bacterial Agents;Charcoal;Graphite;Nanotubes, Carbon;Water Pollutants, Chemical
摘要：
With the development of the removal of organic pollutants in the soil and water environment, antibiotics have been considered as emerging pollutants and received considerable attention among the scientific community. Thus, there is a need for an effective, economical, fast, operational feasible and environmental-friendly technology to remove antibiotics. Adsorption technology would be one of the most promising option on the basis that it best meets the criteria we set out above. From the most primitive activated carbon to the most innovative modified biochar, carbon-based materials have played a significant role in the adsorption process of antibiotics all the time. This paper reviews the adsorption behavior of some representative antibiotics (e.g., chloramphenicols, sulfonamides, tetracyclines, flouroquinolones) over various carbonaceous materials (i.e., activated carbon, carbon nanotubes, graphene, and biochar). Nevertheless, in addition to the structural characteristics and adsorption capacities of carbon-based materials, a special emphasis was placed on the underlying adsorption mechanisms and roles of different influencing factors in the adsorption process. Moreover, the knowledge gaps and research challenges have been highlighted, including design and optimization of the carbonaceous materials for antibiotics adsorption. © 2019 Elsevier Ltd
语种：
英文
展开
Discovery of nitropyridyl-based dichloropropene ethers as insecticides
作者：
Liu, Aiping;Liu, Minhua;Yu, Hong;Ou, Xiaoming;Liu, Xinping;...
期刊：
Bioorganic & Medicinal Chemistry Letters ,2019年29(11):1430-1433 ISSN：0960-894X
通讯作者：
Huang, Mingzhi;Shi, Guorong
作者机构：
[Huang, Lu; Huang, Mingzhi; Liu, Xinping; Yu, Wanqi; Liu, Minhua; Liu, Aiping; Yu, Hong; Ren, Yeguo; Long, Chuyun; Ou, Xiaoming] Hunan Res Inst Chem Ind, Natl Engn Res Ctr Agrochem, Changsha 410007, Hunan, Peoples R China.;[Liu, Aiping] Hunan Prov Key Lab Agrochem, Changsha 410014, Hunan, Peoples R China.;[Yu, Wanqi] Carleton Coll, Dept Chem, Northfield, MN 55057 USA.;[Shi, Guorong] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Huang, Mingzhi; Shi, Guorong] H;Hunan Res Inst Chem Ind, Natl Engn Res Ctr Agrochem, Changsha 410007, Hunan, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Nitropyridyl-based dichloropropene ether;Discovery;Insecticide;Pyridalyl
摘要：
A series of nitropyridyl-based dichloropropene ethers were prepared and evaluated for their insecticidal activities against main lepidopteran pests such as M. separate, P. xylostella and P. litura. The compounds showed a broad-spectrum of remarkable insecticidal activities. Especially 4a (2,6-dichloro-4-(3,3-dichloroallyloxy) phenyl 3-[5-nitro-2-pyridyloxy] propyl ether) and 11a (2-(4-(3-(2,6-dichloro-4-((3,3-dichloroallyl)oxy)phenoxy) propoxy) phenoxy)-5-nitropyridine) displayed potent activities comparable to that of Pyridalyl, the only commercialized dichloropropene ether insecticide thus far. The structure-activity relationship was also discussed.
语种：
英文
展开
Polyoxometalate-coupled graphene nanohybrid via gemini surfactants and its electrocatalytic property for nitrite
作者：
Chen, Shu;Xiang, Yuanfang;Banks, M. Katherine;Xu, Weijian;Peng, Chang* ;...
期刊：
Applied Surface Science ,2019年466:110-118 ISSN：0169-4332
通讯作者：
Peng, Chang;Wu, Ruoxi
作者机构：
[Xu, Weijian; Peng, C; Wu, Ruoxi; Peng, Chang; Chen, Shu; Xiang, Yuanfang] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Peng, Chang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Banks, M. Katherine; Wu, Ruoxi] Texas A&M Univ, Zachry Dept Civil Engn, College Stn, TX 77843 USA.
通讯机构：
[Peng, C; Wu, RX] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Catalyst;Gemini surfactants;Graphene;Polyoxometalate;Stabilizers
摘要：
A novel graphene oxide (GO)-polyoxometalate (POM) nanohybrid is prepared using gemini surfactants (Gem) as stabilizers for the first time. The electrostatic interactions, chemical structure, and morphology of this Gem-GO-POM nanohybrid are systematically characterized, which have been manifested that the Gem-GO-POM nanohybrid provides uniform distribution of POM nanoparticles on the GO nanosheets and exhibits excellent electrochemical activity and stability due to the use of Gem as linkers and stabilizers. The prepared Gem-GO-POM catalyst used as electrode displays an enhanced electro-oxidation of nitrite compared with pure GO and DTAB-GO-POM hybrid using dodecyl trimethyl ammonium bromide (DTAB) as stabilizers. The proposed nanohybrid structure capitalizes on the enhancing in the oxidation reactions ability of the POM through the Gem linkers to provide more binding sites for POM on the surface of GO. © 2018
语种：
英文
展开
材料化学专业课程实验教学改革与探究
作者：
周智;吴贤波;钟美娥;周南
期刊：
化工时刊 ,2019年33(02):51-52 ISSN：1002-154X
作者机构：
湖南农业大学 理学院,湖南 长沙,410128;[钟美娥; 周南; 周智; 吴贤波] 湖南农业大学
关键词：
材料化学;实验教学;改革
摘要：
实验教学是高校教学的重要环节之一, 亦是材料化学专业人才培养的一个重要组成部分, 对材料化学专业课程实验教学进行改革与探究, 对培养高素质的创新型人才具有非常重要的意义.随着新时代的发展, 实验课程教学早已从书本转移到实际操作.进行实际实验操作不仅可以提高大学生的实践能力, 还可以开拓其创新思维、提高创新能力.但是, 现在的材料化学专业课程实验教学已经不能完全满足新时代的发展对材料化学专业学生的要求.通过实践证明, 实验教学与专业科研软件教学能够更加全面的提高材料化学专业学生的综合能力, 更加满足社会对学生能力的要求.
语种：
中文
展开
棒状结构的LiNi1/3Co1/3Mn1/3O2的合成及研究
作者：
刘俊杰;冯永来;吴雄伟
期刊：
广州化工 ,2019年47(5):37-39,42 ISSN：1001-9677
作者机构：
湖南农业大学理学院,湖南 长沙,410128;[吴雄伟; 刘俊杰; 冯永来] 湖南农业大学
关键词：
棒状;锂离子电池;电化学
摘要：
用VGCF为模板,用共沉淀方法辅助合成了棒状结构的LiNi1/3Co1/3Mn1/3O2。通过X-射线衍射仪(XRD)、X射线能谱仪(EDX)、扫描电子显微镜(SEM)对其结构进行了表征,并研究了其电化学性能。结果表明:该材料为棒状且表面多孔,并表现出了良好的电化学性能。在0. 2 C(1 C=170 m A/g)的电流密度下,其容量为160 m Ah/g以上,在1 C下经过250个循环后容量仍然有115. 2 m Ah/g,对于制备其他棒状结构的锂离子正极材料提供了一定的借鉴。
语种：
中文
展开
如何做好有机化学教学
作者：
桂清文;刘卓靓;蒋红梅;王辉宪;刘晓颖
期刊：
广州化工 ,2019年47(21):136-137 ISSN：1001-9677
作者机构：
湖南农业大学理学院,湖南 长沙,410128;国防科技大学文理学院,湖南 长沙,410072;[蒋红梅; 刘晓颖; 桂清文; 王辉宪] 湖南农业大学;[刘卓靓] 中国人民解放军国防科技大学
关键词：
有机化学教学;教学方法;翻转课堂
摘要：
有机化学作为化学化工以及材料等专业的基础必修课,是一门引导学生走进与更深入理解化学的专业学科。但是由于此门课程的知识结构的复杂性以及系统性,和此学科在学生以后的专业发展中的重要性,对高校教师的教学提出了更高的要求。就现今发展的新的教学方法与原有传统教学方法结合,提出一些在有机化学教学上课提高的方法。
语种：
中文
展开
溶剂热法合成Li3V2(PO4)3的形貌及粒径控制研究
作者：
刘德明;李诗凯;唐佳杰;周南;钟美娥
期刊：
广州化工 ,2019年47(20):55-58 ISSN：1001-9677
作者机构：
湖南农业大学分析测试中心,湖南 长沙,410128;湖南农业大学理学院,湖南 长沙,410128;[唐佳杰; 钟美娥; 周南; 李诗凯; 刘德明] 湖南农业大学
关键词：
溶剂热法;影响因素;磷酸钒锂;微球
摘要：
Li3V2(PO4)3因其突出的理论比容量和较高的工作电压,被认为是极具应用潜力的新一代锂离子电池正极材料之一.本实验以LiOH,NH4H2PO4和NH4VO3为反应原料,通过溶剂热法合成Li3V2(PO4)3(LVP)正极材料.探讨了原料的添加顺序,溶剂的种类和比例,反应温度以及保温时间对LVP形貌和粒径的影响.利用扫描电镜观察其形貌和粒径,采用X射线衍射仪表征其晶体结构.实验结果表明:所用溶剂对LVP材料的结构和形貌有显著影响.当选择乙二醇与水混合物(EG:H2 O=1:1)作溶剂,在200℃下反应6 h时,可获得粒径小而均匀的LVP微球.
语种：
中文
展开
紫甘薯α-淀粉酶酶解液中紫色素的分离与糖液发酵生产乙醇的研究
作者：
张杨波;兰时乐;董新荣;黄建安;刘仲华
期刊：
食品工业科技 ,2019年40(9):184-188 ISSN：1002-0306
作者机构：
湖南农业大学园艺园林学院,湖南农业大学茶学教育部重点实验室,湖南长沙410128;湖南农业大学生物科学技术学院,湖南长沙,410128;湖南农业大学理学院,湖南长沙,410128;湖南农业大学园艺园林学院,国家植物功能成分利用工程技术研究中心,湖南长沙410128;[刘仲华; 兰时乐; 张杨波; 黄建安; 董新荣] 湖南农业大学
关键词：
紫甘薯;α-淀粉酶;紫色素;发酵;乙醇
摘要：
本文综合利用紫甘薯资源,同时获得紫色素和糖液,糖液发酵制备乙醇。以大孔树脂分离紫甘薯α-淀粉酶酶解液后获得紫色素与糖液,考察氮源种类与添加量、酵母接种量、发酵时间对糖液发酵产乙醇含量的影响,通过正交实验优化糖液发酵生产乙醇工艺。实验结果表明,紫甘薯酶解液经HPD400型大孔树脂分离,紫色素的色价(E1 cm1%)达到86.3（波长为530 nm）,糖液中总糖含量达到55.5 mg/L;（NH4）2SO4作为发酵氮源,（NH4）2SO4添加量为3.0 g/100 mL、酵母接种量为1.5 mL、发酵时间为7 d,可得到13.0%vol乙醇。此方法获得了紫甘薯色素,副产物糖液发酵可生产乙醇,为紫甘薯的综合利用提供了思路。
语种：
中文
展开
Existence of multiple breathers for discrete nonlinear SchrÖdinger equations
作者：
Zhou, T.;Liu, X.I.A.;Shi, H.;Wen, Z.O.N.G.L.I.A.N.G.
期刊：
ELECTRONIC JOURNAL OF DIFFERENTIAL EQUATIONS ,2019年2019 ISSN：1072-6691
作者机构：
School of Public Administration and Emergency Management, Jinan University, Guangzhou, 510632, China;College of Continuing Education and Open College, Guangdong University of Foreign Studies, Guangzhou, 510420, China;Science College, Hunan Agricultural University, Changsha, 410128, China;Modern Business and Management Department, Guangdong Construction Polytechnic, Guangzhou, 510440, China;School of Mathematics and Statistics, Central South University, Changsha, 410083, China
关键词：
Breather;Critical point;Discrete nonlinear Schrödinger equation;Subquadratic
摘要：
In this article we study discrete nonlinear Schrödinger equations without periodicity assumptions. We show the existence of multiple solutions of the form u n e −iωt (called breathers) by using Clark’s Theorem in critical point theory. © 2019 Texas State University.
语种：
英文
展开
EXISTENCE OF MULTIPLE BREATHERS FOR DISCRETE NONLINEAR SCHRODINGER EQUATIONS
作者：
Zhou, Tao* ;Liu, Xia;Shi, Haiping;Wen, Zongliang
期刊：
ELECTRONIC JOURNAL OF DIFFERENTIAL EQUATIONS ,2019年 ISSN：1072-6691
通讯作者：
Zhou, Tao
作者机构：
[Zhou, Tao] Jinan Univ, Sch Publ Adm & Emergency Management, Guangzhou 510632, Guangdong, Peoples R China.;[Liu, Xia] Guangdong Univ Foreign Studies, Coll Continuing Educ, Guangzhou 510420, Guangdong, Peoples R China.;[Liu, Xia] Guangdong Univ Foreign Studies, Open Coll, Guangzhou 510420, Guangdong, Peoples R China.;[Liu, Xia] Hunan Agr Univ, Sci Coll, Changsha 410128, Hunan, Peoples R China.;[Shi, Haiping] Guangdong Construct Polytech, Modern Business & Management Dept, Guangzhou 510440, Guangdong, Peoples R China.
通讯机构：
[Zhou, Tao] J;Jinan Univ, Sch Publ Adm & Emergency Management, Guangzhou 510632, Guangdong, Peoples R China.
关键词：
Breather;discrete nonlinear Schrodinger equation;subquadratic;critical point
摘要：
In this article we study discrete nonlinear Schrodinger equations without periodicity assumptions. We show the existence of multiple solutions of the form u(n)e(-iwt) (called breathers) by using Clark's Theorem in critical point theory.
语种：
英文
展开
“新工科”背景下农业院校材料化学专业《材料科学基础》教学内容的改革
作者：
刘辉;喻鹏;王志国
期刊：
教育教学论坛 ,2019年(37):118-119 ISSN：1674-9324
作者机构：
湖南农业大学理学院 化学与材料科学系,湖南 长沙,410128;[刘辉; 王志国; 喻鹏] 湖南农业大学
关键词：
材料化学专业;《材料科学基础》;教学内容
摘要：
在着力建设和发展"新工科"的背景下,材料学科的主干基础课程《材料科学基础》的教学内容具有一定的局限性。文章以湖南农业大学材料化学专业的《材料科学基础》教学为例,遵循"重基础、宽口径、求特色"的改革原则,从理论教学内容和实验教学内容两个方面探讨了农业院校材料化学专业《材料科学基础》教学内容的改革。
语种：
中文
展开
Anharmonicity Extends Carrier Lifetimes in Lead Halide Perovskites at Elevated Temperatures.
作者：
Li, Wei;Vasenko, Andrey S.;Tang, Jianfeng* ;Prezhdo, Oleg V.*
期刊：
Journal of Physical Chemistry Letters ,2019年10(20):6219-6226 ISSN：1948-7185
通讯作者：
Tang, Jianfeng;Prezhdo, Oleg V.
作者机构：
[Tang, Jianfeng; Li, Wei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Vasenko, Andrey S.] Natl Res Univ Higher Sch Econ, Moscow 101000, Russia.;[Prezhdo, Oleg V.] Univ Southern Calif, Dept Chem, Los Angeles, CA 90089 USA.
通讯机构：
[Tang, Jianfeng] H;[Prezhdo, Oleg V.] U;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Univ Southern Calif, Dept Chem, Los Angeles, CA 90089 USA.
关键词：
Carrier lifetime;Density functional theory;Energy harvesting;Lead compounds;Molecular dynamics;organic-inorganic materials;Photocatalytic activity;Solar energy;Temperature distribution;Electron-hole recombination;Electronic subsystems;Equilibrium geometries;Hybrid organic-inorganic;In-depth understanding;Nonadiabatic molecular dynamics;Optoelectronic applications;Temperature dependence;Perovskite
摘要：
Lead halide perovskites constitute a very promising class of materials for a broad range of solar and optoelectronic applications. Perovskites exhibit many unusual properties, and recent experiments demonstrate an unusual temperature dependence of charge carrier lifetimes. Focusing on the all-inorganic CsPbBr3, and using a combination of ab initio nonadiabatic molecular dynamics and time-domain density functional theory, we demonstrate that the unconventional behavior arises because of a highly anharmonic nature of atomic motions in perovskites. As temperature increases, perovskite structure undergoes a notable deformation, reflected in tilting of octahedral units, and experiences large-scale anharmonic movements away from the equilibrium geometry. As a result, the electronic energy gap increases, and phonon-induced loss of coherence within the electronic subsystem accelerates. These two factors slow down nonradiative electron-hole recombination, which constitutes the main limitation on efficiencies of perovskite solar, optical, and electronic devices. The increase of charge carrier lifetimes with temperature is particularly beneficial in applications, because materials heat up, for instance, from sunlight during solar energy harvesting. The behavior of the all-inorganic halide perovskite investigated here is different from that of hybrid organic-inorganic perovskites, which exhibit additional disorder associated with reorientations of the asymmetric organic cations. The reported simulations generate an in-depth understanding of the unusual properties of inorganic perovskites, relevant for photocatalytic, photovoltaic, electronic, and optical applications. © 2019 American Chemical Society.
语种：
英文
展开
Chemical pre-reduction and electro-reduction guided preparation of a porous graphene bionanocomposite for indole-3-acetic acid detection.
作者：
Su, Zhaohong;Xu, Xiaolin;Cheng, Yongbing;Tan, Yueming;Xiao, Langtao;...
期刊：
Nanoscale ,2019年11(3):962-967 ISSN：2040-3364
通讯作者：
Qin, Xiaoli;Wang, Huixian
作者机构：
[Qin, Xiaoli; Wang, Huixian; Su, Zhaohong; Xu, Xiaolin; Cheng, Yongbing; Tang, Daili; Jiang, Hongmei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Tan, Yueming] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.;[Xiao, Langtao] Hunan Agr Univ, Coll Biosci & Biotechnol, Hunan Prov Key Lab Phytohormones & Growth Dev, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Qin, XL; Wang, HX] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Acetic acid;Antibodies;Chemical detection;Chemical modification;Cyclic voltammetry;Energy dispersive spectroscopy;Fourier transform infrared spectroscopy;Glass membrane electrodes;Gold nanoparticles;Graphene;High performance liquid chromatography;High resolution transmission electron microscopy;Immunosensors;Nanocomposite films;pH;Polycyclic aromatic hydrocarbons;Reduction;Scanning electron microscopy;Transmission electron microscopy;Ultraviolet visible spectroscopy;Bio-nanocomposite;Chemical impedance spectroscopy;Differential pulse voltammetry;Electrochemical immunosensors;Electrostatic adsorption;Energy dispersive spectroscopies (EDS);Glassy carbon electrodes;Indole-3-acetic acid;Film preparation;gold;graphite;immobilized antibody;indoleacetic acid;indoleacetic acid derivative;metal nanoparticle;nanocomposite;chemistry;electrochemical analysis;electrode;genetic procedures;immunology;limit of detection;oxidation reduction reaction;porosity;static electricity;Antibodies, Immobilized;Biosensing Techniques;Electrochemical Techniques;Electrodes;Gold;Graphite;Indoleacetic Acids;Limit of Detection;Metal Nanoparticles;Nanocomposites;Oxidation-Reduction;Porosity;Static Electricity
摘要：
A porous graphene (PG) bionanocomposite of PG, gold nanoparticles (AuNPs) and anti-indole-3-acetic acid (anti-IAA) antibody for sensitive and label-free amperometric immunoassay of IAA was reported. A PG film was produced by a pre-reduction/electrochemical reduction process on a glassy carbon electrode (GCE) and then a homogeneous AuNPs layer electrodeposition on the PG film. The anti-IAA antibody was immobilized onto the AuNPs through electrostatic adsorption and covalent conjugation. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), cyclic voltammetry (CV), elecro-chemical impedance spectroscopy (EIS), ultraviolet visible spectroscopy (UV-vis) and differential pulse voltammetry (DPV) were used to characterize the PG film and the stepwise modification of the immunosensor. The electrochemical immunosensor exhibited a wide linear range from 2 × 10 -11 to 2 × 10 -8 g mL -1 with a detection limit of 0.016 ng mL -1 (S/N = 3) and showed significant linearity R 2 = 0.9970. In addition, the proposed immunosensor showed acceptable selectivity and has been applied to the determination of IAA in the extract samples of several plant seeds with acceptable relative derivation (%) ranging from -5.25% to 4.24% between the immunosensor and high performance liquid chromatography. The proposed chemical pre-reduction and electro-reduction guided protocol can be extended to the preparation of many other functionalized PG nanocomposite films for wide applications. © 2019 The Royal Society of Chemistry.
语种：
英文
展开
Photoluminescence properties and energy transfer in a novel Sr8ZnY(PO4)7:Tb3+,Eu3+ phosphor with high thermal stability and its great potential for application in warm white light emitting diodes
作者：
Xia, Mao;Wu, Xianbo;Zhong, Yuan;Hintzen, H. T. (Bert);Zhou, Zhi* ;...
期刊：
Journal of Materials Chemistry C ,2019年7(10):2927-2935 ISSN：2050-7526
通讯作者：
Zhou, Zhi;Wang, Jing
作者机构：
[Xia, Mao; Zhong, Yuan; Wu, Xianbo; Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Zhong, Yuan; Wu, Xianbo; Zhou, Zhi; Wang, Jing] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;[Xia, Mao] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.;[Hintzen, H. T. (Bert)] Delft Univ Technol, Fac Sci Appl, Sect Fundamental Aspects Mat & Energy, Grp Luminescent Mat, Delft, Netherlands.;[Wang, Jing] Sun Yat Sen Univ, Sch Chem, Sch Mat Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China.
通讯机构：
[Zhou, Zhi; Zhou, Z; Wang, J] H;[Wang, Jing] S;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;Sun Yat Sen Univ, Sch Chem, Sch Mat Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China.
关键词：
Crystal structure;Energy transfer;High temperature applications;Light emission;Light emitting diodes;Phosphors;Solid state reactions;Strontium compounds;Thermodynamic stability;X ray powder diffraction;Correlated color temperature;Dipole dipole interactions;Energy transfer mechanisms;High temperature solid-state reaction;Internal quantum efficiency;Photoluminescence properties;Temperature-dependent spectra;White light emitting diodes;Zinc compounds
摘要：
Terbium and europium co-doped Sr8ZnY(PO4)7 phosphors are successfully prepared through a high temperature solid-state reaction (SSR). The crystal structure of the as-prepared samples was identified to be Sr8ZnY(PO4)7 (SZYP) pure phase by an X-ray powder diffraction technique. Under near-ultraviolet light excitation (378 nm), the SZYP:Tb3+ and SZYP:Eu3+ phosphors show green and red emission peaking at 545 and 618 nm, respectively. Moreover, an effective energy transfer process from Tb3+ to Eu3+ could be verified by the concentration dependence of emission intensity and lifetime. The energy transfer mechanism between Tb3+ and Eu3+ is determined to be governed by dipole-dipole interactions. The internal quantum efficiency (IQE) is evaluated to be as high as about 91%. The temperature-dependent spectra indicate that the SZYP:Tb3+,Eu3+ phosphor shows a high thermal stability. Furthermore, the as-fabricated white LED devices exhibit an excellent correlated color temperature (CCT) of 3223 K, a color rendering index (Ra) of 85.8 and a luminance efficiency of 37.4 lm W-1. All results imply that the SZYP:Tb3+,Eu3+ phosphors have a great potential for application in white LEDs. © 2019 The Royal Society of Chemistry.
语种：
英文
展开
红黄土谷壳混配基质培育机插秧技术探索与实践
作者：
李绪孟;熊朝晖;陈胜文;周长庚;程乐根;...
期刊：
中国稻米 ,2019年25(3):57-59 ISSN：1006-8082
作者机构：
湖南农业大学理学院;沅江市农业农村局;[陈胜文] 益阳市赫山区种子技术推广与储备中心;[傅志强; 李绪孟] 湖南农业大学;[周长庚; 刘志清; 程乐根; 熊朝晖] 湖南省沅江市农业农村局
会议名称：
全国第十八届水稻优质高产理论与技术研讨会
会议时间：
2019-06-23
会议地点：
中国广西南宁
会议论文集名称：
全国第十八届水稻优质高产理论与技术研讨会 论文集
关键词：
红黄土;谷壳;混配基质;机插秧
摘要：
规模化培育机插秧必须使用育秧基质。目前生产上普遍采用的商品有机基质,能培育出素质较好的秧苗,但成本过高,制约了机插秧的大面积推广。笔者通过试验探索了红黄土谷壳混配基质规模化培育机插秧新技术,与高质量的有机商品基质育秧相比,红黄土谷壳混配基质亦可培育出同等质量的机插秧苗,并显著降低成本,适合工厂化、规模化培育机插秧。
语种：
中文
展开
Intelligent RGV Dynamic Scheduling Strategy
作者：
钟卓辉;高雨彤;周嘉欣;李纯
期刊：
计算机科学与应用 ,2019年09(01):89-95 ISSN：2161-8801
作者机构：
湖南农业大学，理学院，湖南 长沙;湖南农业大学，经济学院，湖南 长沙
关键词：
Intelligent Processing System;Dynamic Scheduling Strategy;Monte Carlo Algorithm
摘要：
In this paper, aiming at the material processing operations of one and two processes of the linear track RGV intelligent processing system, the dynamic scheduling model and algorithm of RGV are given by taking the actual number of finished products, RGV operating efficiency and CNC operating efficiency as the objective functions. In the former, the overall efficiency of the intelligent processing system is higher and the moving mode of the trolley is basically similar under the experimental data with little time difference between different operations. The latter obtained that the operation time of different processes would affect the number of CNC allocated in different processes and the operation mode of moving trolley. The data simulation results showed that the established model and algorithm were feasible.
语种：
英文
展开
基于因子分析的各省市环境综合水平研究
作者：
胡锐玲
期刊：
中国经贸导刊 ,2019年(03):133-134 ISSN：1007-9777
作者机构：
湖南农业大学理学院;[胡锐玲] 湖南农业大学
关键词：
因子分析;环境水平;综合评价指标
摘要：
对2017年31个省市的综合反映水资源污染程度和空气污染程度的8个因素进行实证研究,建立因子模型,综合分析且对比全国各省市的环境综合水平,由综合得分排名得出我国环境综合水平差别悬殊;具体表现为广东省、河北省环境综合水平较差,西藏自治区、海南省环境综合水平较好;提出在环境治理的过程中要全面控制好水资源和空气质量水平。
语种：
中文
展开
Theoretical study on organic dyes with tunable π-spacers for dye-sensitized solar cells: Inspired by the organic polymer photovoltaics
作者：
Xie, Xiaoyin;Liu, Zhihai;Li, Wei;Bai, Fu-Quan* ;Lee, Eun-Cheol* ;...
期刊：
Chemical Physics Letters ,2019年719:39-44 ISSN：0009-2614
通讯作者：
Bai, Fu-Quan;Zhang, Hong-Xing;Lee, Eun-Cheol
作者机构：
[Bai, Fu-Quan; Zhang, Hong-Xing; Xie, Xiaoyin; Zhang, HX] Jilin Univ, Inst Theoret Chem, Int Joint Res Lab Nanomicro Architecture Chem, Changchun 130023, Jilin, Peoples R China.;[Xie, Xiaoyin] Jilin Inst Chem Technol, Dept Chem Technol, Jilin 132022, Jilin, Peoples R China.;[Liu, Zhihai] Yantai Univ, Sch Optoelect Informat Sci & Technol, Yantai 264005, Shandong, Peoples R China.;[Li, Wei] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Lee, Eun-Cheol] Gachon Univ, Dept Nanophys, Gyeonggi 13120, South Korea.
通讯机构：
[Bai, FQ; Zhang, HX] J;[Lee, Eun-Cheol] G;Jilin Univ, Inst Theoret Chem, Int Joint Res Lab Nanomicro Architecture Chem, Changchun 130023, Jilin, Peoples R China.;Gachon Univ, Dept Nanophys, Gyeonggi 13120, South Korea.
关键词：
Dye-sensitized solar cells;Organic dyes;Polymer photovoltaics;Theoretical investigation;π-spacer
摘要：
We present the theoretical investigation on tuning π-spacers in D-π-A organic dyes for dye-sensitized solar cells (DSSCs). The validity of three series of conjugate units (12 types) conventionally used in polymer photovoltaics are utilized as the π-spacers of organic dyes. Our results indicate that the extension of π conjugation can efficiently improve the absorption intensity. The absorption spectra red-shifts is because the increased π-spacers significantly destabilize the highest occupied molecular orbital level, whereas the lowest unoccupied molecular orbital level has negligible changed. Our simulation is expected to assist the design high performance dyes for dye-sensitized solar cells applications. © 2019 Elsevier B.V.
语种：
英文
展开
Unveiling the Role of Heteroatom Gradient-Distributed Carbon Fibers for Vanadium Redox Flow Batteries with Long Service Life
作者：
Wu, Xiong-Wei;Deng, Qi* ;Peng, Chang;Zeng, Xian-Xiang;Wu, An-Jun;...
期刊：
ACS Applied Materials & Interfaces ,2019年11(12):11451-11458 ISSN：1944-8244
通讯作者：
Deng, Qi;Lu, Xiang-Yang;Guo, Yu-Guo
作者机构：
[Wu, An-Jun; Ma, Qiang; Wu, Xiong-Wei; Peng, Chang; Deng, Q; Lu, Xiang-Yang; Deng, Qi; Zeng, Xian-Xiang; Zhou, Chun-Jiao] Hunan Agr Univ, Coll Sci, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;[Yin, Ya-Xia; Guo, Yu-Guo] Chinese Acad Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, CAS Res Educ Ctr Excellence Mol Sci,BNLMS, Beijing 100190, Peoples R China.;[Yin, Ya-Xia; Guo, Yu-Guo] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
通讯机构：
[Deng, Q; Lu, XY] H;[Guo, Yu-Guo] C;[Guo, Yu-Guo] U;Hunan Agr Univ, Coll Sci, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.;Chinese Acad Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, CAS Res Educ Ctr Excellence Mol Sci,BNLMS, Beijing 100190, Peoples R China.
关键词：
vanadium redox flow batteries;electrocatalysis;carbon fibers;heteroatoms gradient distribution;long service life
摘要：
The fundamental understanding of electrocatalytic reaction process is anticipated to guide electrode upgradation and acquirement of high-performance vanadium redox flow batteries (VRFBs). Herein, a carbon fiber prototype system with a heteroatom gradient distribution has been developed with enlarged interlayer spacing and a high graphitization that improve the electronic conductivity and accelerate the electrocatalytic reaction, and the mechanism by which gradient-distributed heteroatoms enhance vanadium redox reactions was elucidated with the assistance of density functional theory calculations. All these contributions endow the obtained electrode prominent redox reversibility and durability with only 1.7% decay in energy efficiency over 1000 cycles at 150 mA cm(-2) in the VRFBs. Our work sheds light on the significance of elaborated electrode design and impels the in-depth investigation of VRFBs with long service life.
语种：
英文
展开
