作者:
Xiang Dong Qing;Lin Da Yin;Xiao Hua Zhang;Yi Huang;Ling Xu;...
期刊:
Science Journal of Analytical Chemistry,2020年8(3):93-106
作者机构:
College of Materials and Chemical Engineering, Hunan City University, Yiyang, China;Hunan Provincial Key Laboratory of Dark Tea and Jin-hua, Hunan City University, Yiyang, China;School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi, China;Food and Bioengineering College, Xuchang University, Xuchang, China;School of Chemical Engineering, Xiangtan University, Xiangtan, China
摘要:
A new receptor model based on the alternating trilinear decomposition followed by a score matrix reconstruction (ATLD-SMR) was developed for the source apportionment of urban PM10 for the first time. First, simulated three-way data arrays of gas chromatography-mass spectrometry (GC-MS) were used to verify the feasibility of the ATLD-SMR method. Then, PM10 samples (receptor) at five locations and TSP samples of ten pollution sources were collected during July and August, 2018 in Loudi City, China. The collected samples were measured by GC-MS. PAHs were used as tracers and their concentrations were accurately obtained by the ATLD-SMR analysis of GC-MS data of these samples after the problems of GC-MS including baseline drift, retention-time shift and unexpected peaks overlapping were successfully resolved. The highest concentrations of individual PAH in these samples were for phenanthrene and benzo [a] pyrene (40.76 ng m-3 and 39.63 ng m-3 in Liangang steel-making workshop, respectively). Last, a relative contribution matrix of the source to the receptor was estimated by the ATLD-SMR method. The proposed method was employed to apportion the source contributions to PM10 particles at five locations and reasonable results were obtained, thus presenting a promising tool for source apportionment of complex ambient particulate matter.
摘要:
The synthetic methodology for direct indole functionalizations is of great significance in indole chemistry and has been intensively investigated in the last few decades. From the perspective of green chemistry, oxygen is the best choice as the terminal oxidant in molecular synthesis. Hence, aerobic oxidative functionalization of indoles became a hot research topic in the last decade. Numerous efficient protocols in this field have been discovered that enable facile and efficient transformations of indoles to related valuable compounds, which are summarized and discussed in detail in this review.
作者机构:
[Chen, Xiaohua; Xu, Yali; Tang, Qunli; Li, Weize; Hu, Aiping; Li, Yanhua; Zhang, Yan; Fan, Binbin; Liu, Jilei] Hunan Univ, Coll Mat Sci & Engn, Hunan Prov Key Lab Adv Carbon Mat & Appl Technol, Changsha 410082, Hunan, Peoples R China.;[Yan, Jiaxu] Nanjing Tech Univ Nanjing Tech, Key Lab Flexible Elect KLOFE, Jiangsu Natl Synergist Innovat Ctr Adv Mat SICAM, 30 South Puzhu Rd, Nanjing 211816, Peoples R China.;[Yan, Jiaxu] Nanjing Tech Univ Nanjing Tech, Inst Adv Mat IAM, Jiangsu Natl Synergist Innovat Ctr Adv Mat SICAM, 30 South Puzhu Rd, Nanjing 211816, Peoples R China.;[Liu, Zheng] Hunan City Univ, Coll Mat & Chem Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413000, Peoples R China.
通讯机构:
[Chen, XH; Liu, JL] H;Hunan Univ, Coll Mat Sci & Engn, Hunan Prov Key Lab Adv Carbon Mat & Appl Technol, Changsha 410082, Hunan, Peoples R China.
摘要:
Potassium ion hybrid capacitors (PIHCs) have drawn considerable attention due to the fact that they can combine the merits of high energy density of potassium ion batteries (KIBs) and high power density of supercapacitors. However, the sluggish kinetics caused by the large radius of K+ largely hinder the practical application of PIHCs. In this work, we report a nitrogen and sulfur co-doped 3D hierarchical porous carbon (N, S-3DHPC-600) as an anode for KIBs, possessing boosted potassium storage performance in terms of high reversible capacity, superior durability and rate capability. This N, S-3DHPC-600 electrode provides a large surface area, highly interconnected micro/mesoporosity, high ratio of pyridinic N/pyrrolic N and enlarged interlayer distance, which could promote the fast intercalation/deintercalation of K+, improve the surface charge capacity and maintain the structural stability of electrode material. As expected, a PIHCs device is constructed by employing this N, S-3DHPC-600 as an anode and AC-800 as a cathode, delivering exceptionally high energy/power densities (130.6 Wh Kg(-1)/16800W Kg(-1)), as well as a long cycle life (86.8% capacity retention after 5000cycles). (C) 2020 Published by Elsevier Ltd.
摘要:
Abstract: In this study, in order to achieve the goal of new engineering, a phased and progressive practical teaching system to strengthen post skills training was constructed. The system is of a “2 + 3” mode, i.e. two practice platforms of inside and outside school and three links of basic operation skills including basic operation skills, comprehensive application skills, employment innovation ability. The cultivation system of university independent practice ability is also discussed. The evaluation mechanism of practice teaching effect and feedback mechanism of continuous improvement are established. The gap between school and society on talent training and demand was effectively narrowed. It provides a reference for the cultivation of applied talents of science and engineering majors.#@#@#摘要: 本研究在新工科建设目标下摸索并构建强化岗位技能培训的实践教学体系,构建由校内和校外两个实践平台体系和基本操作技能、综合应用技能、就业创新能力3个环节相结合的分阶段、递进式的“2 + 3”实践教学体系和大学自主实践能力培养体系,建立了实践教学效果评价机制和持续改进的反馈机制,有效缩小学校与社会对人才培养与需求之间的差距,为理工科专业的应用型人才培养提供参考。