MnO2 reduction by calcium lignosulfonate: the kinetics and mechanism studies
作者:
Wu, Fangfang;Deng, Jie;Kuang, Jiaqi;Xiao, Zhu;Liu, Hui;...
期刊:
Canadian Metallurgical Quarterly ,2020年59(1):78-84 ISSN:0008-4433
通讯作者:
Yu, Peng;Mi, Baobin
作者机构:
[Kuang, Jiaqi; Yu, Peng; Xiao, Zhu; Deng, Jie; Liu, Hui; Wu, Fangfang; Liang, Min] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;[Mi, Baobin] Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Peoples R China.
通讯机构:
[Yu, Peng; Mi, Baobin] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Peoples R China.
关键词:
adsorption;calcium lignosulfonate;internal diffusion;kinetic model;leaching;Manganese dioxide ore;reductive process mechanism;sulphuric acid
摘要:
The kinetics and mechanism of the reduction of manganese dioxide ore by calcium lignosulfonate (CLS) in acid solution were investigated. The results showed that the reducing process mainly occurred after the adsorption and then decomposition of CLS by ore and the concentration of sulphuric acid exerted an enhancing effect on both CLS adsorption and manganese extraction. The effects of leaching temperature, the mass ratio of CLS to MnO2 in ore, concentration of sulphuric acid as well as leaching time on per cent leached of Mn were also discussed. The experimental data were well interpreted with a shrinking core model of internal diffusion, and an overall kinetic model was established. The reaction rate constant was found to be proportional to the mass ratio of CLS to MnO2 in ore and concentration of sulphuric acid, and the apparent activation energy was determined to be 69.4 kJ mol−1 by using Arrhenius expression. © 2020, © 2020 Canadian Institute of Mining, Metallurgy and Petroleum.
语种:
英文
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葛根淀粉生产水中葛根素的富集纯化工艺优化
作者:
徐梦玮;肖力;李漪锦;董新荣;刘德明;...
期刊:
湖北农业科学 ,2020年59(18):107-111 ISSN:0439-8114
作者机构:
湖南农业大学理学院,长沙410128;湖南农业大学理学院分析测试中心,长沙410128;张家界越天然农产品开发有限公司,湖南张家界427200
关键词:
葛根;葛根素;分离纯化;大孔吸附树脂;总异黄酮
摘要:
研究了大孔吸附树脂富集纯化葛根淀粉生产排放水中葛根素的方法,并考察了15种型号的树脂对葛根总异黄酮的动态吸附容量及乙醇的洗脱效果。结果表明,HPD-300树脂对葛根总异黄酮的动态吸附容量可达到39.41 mg/mL,吸附后的树脂以70%乙醇1.0 BV/h流速进行梯度洗脱的洗脱率可达到91.42%。从3 L排放水中可回收总异黄酮样品4.7 g,总异黄酮含量(UV比色法)可达到61.67%,葛根素含量(HPLC法)可达31.80%。总异黄酮粗品经5%盐酸水解及重结晶,得到了96.37%高纯度的葛根素样品,相对总异黄酮粗品的回收率为15.91%。以上方法为从葛根淀粉生产排放水中富集纯化葛根素的最佳优化工艺条件。
语种:
中文
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A review of public and environmental consequences of organic germanium
作者:
Zheng, Jiangfu;Yang, Lihua;Deng, Yaocheng* ;Zhang, Chenyu;Zhang, Yang;...
期刊:
Critical Reviews in Environmental Science and Technology ,2020年50(13):1384-1409 ISSN:1064-3389
通讯作者:
Deng, Yaocheng;Gong, Daoxin
作者机构:
[Zhang, Yang; Liao, Chanjuan; Deng, Yaocheng; Gong, Daoxin; Yang, Lihua; Xiong, Sheng; Zhang, Chenyu; Zhao, Jia; Gong, DX; Zheng, Jiangfu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Zhang, Yang; Liao, Chanjuan; Deng, Yaocheng; Gong, Daoxin; Yang, Lihua; Xiong, Sheng; Zhang, Chenyu; Zhao, Jia; Zheng, Jiangfu] Hunan Agr Univ, Inst Agr Environm Protect, Changsha, Hunan, Peoples R China.;[Ding, Chunxia] Hunan Agr Univ, Coll Sci, Changsha, Hunan, Peoples R China.
通讯机构:
[Deng, YC; Gong, DX] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.
关键词:
Environmental impact;environmental pollutants;organic germanium;recycling and removal technology;toxicity of heavy metal
摘要:
Germanium (Ge) is a widely distributed but rare element on earth. Organic germanium is the most widely used form of germanium. Compared to the common metal (mercury, cadmium, lead, etc.), organic germanium is much less toxic to humans than others. Since its discovery in 1886, organic germanium and relative compounds have caused many medically related problems across the globe. In most cases, organic germanium exists in the natural environment in an oxidation state. The size of organic germanium and its compounds is extremely small in natural water, for which organic germanium can easily enter the environment through the flow of water. Because organic germanium owns unique chemical properties and is potentially ecotoxic, so there are have special environmental problems. Considering the fact that people does not know much about organic germanium, along with the lack of systematic research, this paper starts with a brief introduction of the chemical composition, distribution, and threat to human health of organic germanium. Then, the new and common technologies for the recovery and removal of germanium as referred to in various literatures introduced and with detail description of their performance, advantages, disadvantages, and applications. It is of great significance for people to understand organic germanium and its pollution control. © 2019, © 2019 Taylor & Francis Group, LLC.
语种:
英文
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Raising the capacity of lithium vanadium phosphate via anion and cation co-substitution
作者:
Zeng, Xian-Xiang;Chen, Hui;Guo, Gang;Li, Sheng-Yi;Liu, Jin-Ying;...
期刊:
中国科学:化学英文版 ,2020年63(2):203-207 ISSN:1674-7291
通讯作者:
Wu, Xiong-Wei;Guo, Yu-Guo
作者机构:
[Ma, Qiang; Chen, Hui; Wu, Xiong-Wei; Liu, Jin-Ying; Guo, Gang; Zeng, Xian-Xiang] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;[Li, Sheng-Yi; Yin, Ya-Xia; Guo, Yu-Guo] Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China.;[Li, Sheng-Yi; Yin, Ya-Xia; Guo, Yu-Guo] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Liu, Guote] Foshan Univ, Coll Elect Engn & Automat, Foshan 528225, Peoples R China.
通讯机构:
[Wu, Xiong-Wei] H;[Guo, Yu-Guo] C;[Guo, Yu-Guo] U;Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China.
关键词:
polyanion cathode;ion substitution;carbon coating;high rate;theoretical capacity
摘要:
The pursuit for batteries with high specific energy provokes the research of high-voltage/capacity cathode materials with superior stability and safety as the alternative for lithium iron phosphate. Herein, using the sol-gel method, a lithium vanadium phosphate with higher average discharge voltage (3.8 V, vs. Li~+/Li) was obtained from a single source for Mg~(2+) and Cl~- co-substitution and uniform carbon coating, and a nearly theoretical capacity (130.1 mA h g~(-1)) and outstanding rate performance (25 C) are acquired together with splendid capacity retention (80%) after 650 cycles. This work reveals that the well-sized anion and cation substitution and uniform carbon coating are of both importance to accelerate kinetic performance in the context of nearly undisturbed crystal structure for other analogue materials. It is anticipated that the electrochemistry comprehension will shed light on preparing cathode materials with high energy density in the future.
语种:
英文
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Palindromic probe-mediated strand displacement amplification for highly sensitive and selective microRNA imaging
作者:
Xu, Huo;Niu, Huimin;Liu, Jingtao;Zhang, Yafeng;Yin, Hongwei;...
期刊:
Talanta ,2020年219:121295 ISSN:0039-9140
通讯作者:
Yu, Suhong;Wu, Zai-Sheng;Liu, Dengyou
作者机构:
[Liu, Jingtao; Xu, Huo; Yu, Suhong; Wu, Zai-Sheng; Yin, Hongwei; Niu, Huimin; Zhang, Yafeng; Jiang, Zhou] Fuzhou Univ, Coll Chem, Biopharmaceut Photocatalysis State Key Lab Photoc, Canc Metastasis Alert & Prevent Ctr, Fuzhou 350002, Peoples R China.;[Liu, Jingtao; Xu, Huo; Yu, Suhong; Wu, Zai-Sheng; Yin, Hongwei; Niu, Huimin; Zhang, Yafeng; Jiang, Zhou] Fuzhou Univ, Coll Chem, Fujian Prov Key Lab Canc Metastasis Chemoprevent, Fuzhou 350002, Peoples R China.;[Liu, Dengyou] Hunan Agr Univ, Sci Coll, Changsha 410128, Peoples R China.;[Xu, Huo] Minjiang Univ, Inst Oceanog, Fuzhou 350108, Fujian, Peoples R China.
通讯机构:
[Yu, SH; Wu, ZS] F;[Liu, Dengyou] H;Fuzhou Univ, Coll Chem, Biopharmaceut Photocatalysis State Key Lab Photoc, Canc Metastasis Alert & Prevent Ctr, Fuzhou 350002, Peoples R China.;Fuzhou Univ, Coll Chem, Fujian Prov Key Lab Canc Metastasis Chemoprevent, Fuzhou 350002, Peoples R China.;Hunan Agr Univ, Sci Coll, Changsha 410128, Peoples R China.
关键词:
Palindromic probe-mediated strand displacement amplification (pSDA);miRNAs;Tumor cells;Confocal scanning microscopy
摘要:
MicroRNAs (miRNAs) are involved in a variety of biological processes, and the accurate detection of miRNAs is of great importance for early diagnosis of various cancers. Herein, we have developed a highly sensitive method for the intracellular imaging of miRNAs based on a palindromic probe-induced strand displacement amplification (pSDA). The sensing element is a partly complementary hybrid consisting of two DNA components: one fluorescent dye-labeled signaling probe containing a palindromic sequence and loop-based target recognition site and one quencher moiety-attached locking probe. In the presence of target miRNA, the target species can hybridize with the loop site and release the terminal palindromic fragment, initiating the pSDA reaction. Thus, a considerable amount of fluorescent moieties are spatially separated from the quenchers, generating a dramatically enhanced fluorescence signal. As a result, the target miRNAs can be quantified down to 25 pM with the linear response range over four orders of magnitude. The detection specificity is high enough to eliminate the interference from nontarget miRNAs and other biospecies co-existing in samples, and thus the diseased cells are easily distinguished from healthy cells. Strikingly, the pSDA-based system possesses the desirable capability to discriminate tumor cells from healthy cells, indicating a promising diagnostic tool for the detection of cancers and other diseases in early stage.
语种:
英文
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基础物理实验教学与学生创新能力培养的探索
作者:
龙卧云
期刊:
教书育人(高教论坛) ,2020年(21):106-107 ISSN:1008-2549
作者机构:
湖南农业大学应用物理系
关键词:
物理实验;创新;教学模式
摘要:
物理实验课程对于培养学生的实践能力和创新能力起着非常重要的作用。结合学校自身特色,针对目前的教学现状,提出改革措施,探讨基础物理实验在加强学生创新思维训练与创新能力培养方面的实践。
语种:
中文
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Bronsted acid-promoted thiazole synthesis under metal-free conditions using sulfur powder as the sulfur source
作者:
Ni, Penghui;Tan, Jing;Li, Rong;Huang, Huawen;Zhang, Feng* ;...
期刊:
RSC Advances ,2020年10(7):3931-3935 ISSN:2046-2069
通讯作者:
Deng, Guo-Jun;Zhang, Feng
作者机构:
[Li, Rong; Tan, Jing; Deng, Guo-Jun; Huang, Huawen; Ni, Penghui] Xiangtan Univ, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat, Minist Educ,Coll Chem, Xiangtan 411105, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
通讯机构:
[Deng, Guo-Jun] X;[Zhang, Feng] H;Xiangtan Univ, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat, Minist Educ,Coll Chem, Xiangtan 411105, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
摘要:
A Bronsted acid-promoted sulfuration/annulation reaction for the one-pot synthesis of bis-substituted thiazoles from benzylamines, acetophenones, and sulfur powder has been developed. One C-N bond and multi C-S bonds were selectively formed in one pot. The choice of the Bronsted acid was the key to the high efficiency of this transformation under metal-free conditions.
语种:
英文
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柑橘叶片类胡萝卜素提取方法研究(英文)
作者:
张薇;谢丹;文志勇;钟广炎
期刊:
Agricultural Science & Technology ,2020年21(02):26-31 ISSN:1009-4229
作者机构:
湖南农业大学理学院,湖南 长沙 410128;广东省农科院果树研究所,广东 广州514640;[张薇; 谢丹; 文志勇] 湖南农业大学;[钟广炎] 广东省农业科学院果树研究所
关键词:
柑橘;叶片;类胡萝卜素;提取方法
摘要:
为了探究柑橘叶片类胡萝卜素提取方法,通过单因素试验和正交试验考察超声波辅助法提取三红蜜柚叶片中类胡萝卜素的效果.结果表明:最佳提取方法为提取剂选用乙醇:丙酮=1:1(v/v,含0.1%BHT),料液比1:30(g/mL),提取时间7 min,超声波功率240 W,提取次数3次.在此提取工艺条件下,得到柑橘叶片类胡萝卜素的提取率为85.98%.
语种:
中文
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Preparation and characterisation of carbon-coated Magneli phase Ti4O7 by modified carbon-thermal reduction route
作者:
Bao, Xinjun;Zhang, Zejie;Yi, Shijie;Yang, Qingshan;Yu, Peng;...
期刊:
Micro & Nano Letters ,2020年15(14):984-987 ISSN:1750-0443
通讯作者:
Zhou, Debi
作者机构:
[Zhou, Debi; Yi, Shijie; Zhang, Zejie; Bao, Xinjun] Cent South Univ, Sch Chem & Chem Engn, Changsha 410083, Peoples R China.;[Yang, Qingshan] Hunan Nonferrous Met Vocat & Tech Coll, Zhuzhou 412006, Peoples R China.;[Yu, Peng] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
通讯机构:
[Zhou, Debi] C;Cent South Univ, Sch Chem & Chem Engn, Changsha 410083, Peoples R China.
关键词:
mesoporous materials;carbon;titanium compounds;electrolytes;catalysis;heat treatment;reduction (chemical);scanning electron microscopy;semiconductor materials;composite materials;catalysts;oxygen;surface chemistry;high-pressure pelleted treatment;oxygen reduction reaction catalytic activity;titanium sulphate;polyvinyl alcohol;heat treatment temperature;carbon-coated Magnéli phase;carbon-thermal reduction route;Ti4O7 composite;carbonthermal reduction;hydrolysis;oxide ions;scanning electron microscopy;spherical morphology;mesopore structure;BET surface area;electrochemical stability;alkaline electrolyte;C-Ti4O7;O2
摘要:
A carbon-coated Magnéli phase Ti4O7 composite has been successfully synthesised, via modified carbonthermal reduction of amorphous TiO2, which was prepared from hydrolysis of titanium sulphate and polyvinyl alcohol, at a relatively low temperature and fast reaction rate. Moreover, the effect of heat treatment temperature and time on the reduced phases is revealed. Despite removal of oxide ions, scanning electron microscopic images clearly show the obtained carbon-coated Ti4O7 composite retains well the spherical morphology of the precursor, and the high-pressure pelleted treatment effectively inhibits the growth of the final product during the heat treatment process. In addition, the prepared composite with mesopore structure exhibits a Brunauer, Emmett, and Teller (BET) surface area as high as 84.495 m2 g−1 and good electrochemical stability in alkaline electrolyte, as well as some oxygen reduction reaction catalytic activity. The results presented in this work open an avenue for its potential electrochemical applications. © The Institution of Engineering and Technology 2020
语种:
英文
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Ductile-brittle transition of open-cell nanoporous Cu in tension: A reliance of specific surface area
作者:
Wang, L.;Bi, W. B.;Deng, L.;Xiao, S. F.;Li, B.;...
期刊:
Scripta Materialia ,2020年175:43-48 ISSN:1359-6462
通讯作者:
Zhang, X. M.;Tang, J. F.
作者机构:
[Zhang, XM; Tang, J. F.; Bi, W. B.; Zhang, X. M.; Deng, L.; Wang, L.] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Li, B.; Deng, X. L.] China Acad Engn Phys, Inst Fluid Phys, Natl Key Lab Shock Wave & Detonat Phys Res, Mianyan 621900, Peoples R China.;[Xiao, S. F.] Hunan Univ, Coll Phys & Micro Elect, Changsha 410082, Hunan, Peoples R China.;[Hu, W. Y.] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构:
[Zhang, XM; Tang, JF] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词:
Nanoporous;Uniaxial tension;Ductile-brittle transition;Dislocation networks
摘要:
We report the ductile-brittle transitions and their reliances on specific surface area (gamma), for the bicontinuous and open-cell nanoporous (NP) Cu in tension, using molecular dynamics simulations. With an increase of gamma, NP Cu undergo the first ductile-to-brittle (gamma <= 2.13 nm(-1)) and subsequent brittle-to-ductile (gamma <= 2.13 nm(-1)) transitions. Two different plasticity modes are governing such two ductile-brittle transitions: dislocation activities inhibition for the former and dislocation networks formation contributes to the latter. Serving as the origin of dislocations/stacking faults, the surface characteristic plays a key role in such ductile-brittle transition and deformation modes. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
语种:
英文
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Iron-Catalyzed Cleavage Reaction of Keto Acids with Aliphatic Aldehydes for the Synthesis of Ketones and Ketone Esters
作者:
Zhou, Fangyuan;Li, Lesong;Lin, Kao;Zhang, Feng;Deng, Guo-Jun;...
期刊:
Chemistry - A European Journal ,2020年26(19):4246-4250 ISSN:0947-6539
通讯作者:
Gong, Hang
作者机构:
[Zhou, Fangyuan; Li, Lesong; Deng, Guo-Jun; Lin, Kao; Gong, Hang] Xiangtan Univ, Coll Chem, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat,Minist, Xiangtan 411105, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
通讯机构:
[Gong, Hang] X;Xiangtan Univ, Coll Chem, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat,Minist, Xiangtan 411105, Peoples R China.
关键词:
catalysis;decarbonylation;decarboxylation;cross-coupling;synthetic methods
摘要:
The radical–radical coupling reaction is an important synthetic strategy. In this study, the iron-catalyzed radical–radical cross-coupling reaction based on the decarboxylation of keto acids and decarbonylation of aliphatic aldehydes to obtain valuable aryl ketones is reported for the first time. Remarkably, when tertiary aldehydes were used as carbonyl sources, ketone esters were selectively obtained instead of ketones. The gram-scale preparation of aryl ketone through this strategy was easily achieved by using only 3 mol % of the iron catalyst. As a proof-of-concept, the bioactive molecule flurprimidol was synthesized in two steps by using this strategy. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
语种:
英文
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Carbon encapsulation and chlorine doping enable Na3V2(PO4)3 superior sodium ion storage properties as cathode material for sodium ion battery
作者:
Liu, Xiaoying;Li, Muyi;Yang, Xiang;Zeng, Xiang;Wang, Huixian;...
期刊:
Powder Technology ,2020年364:70-77 ISSN:0032-5910
通讯作者:
Jiang, Hongmei
作者机构:
[Liu, Xiaoying; Zeng, Xiang; Yang, Xiang; Wang, Huixian; Li, Muyi; Jiang, Hongmei] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
通讯机构:
[Jiang, Hongmei] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
关键词:
Sodium ion battery;Na3V2(PO4)(3);Carbon encapsulation;Chlorine doping;Sodium storage performance
摘要:
NASICON-structured Na3V2(PO4)3 possessing three-dimensional channel for sodium ion migration demonstrates promising prospect as cathode for sodium ion battery due to good thermal stability and large theoretical capacity. Herein, carbon encapsulation and chlorine doping are employed to improve sodium storage performances of Na3V2(PO4)3 through sol-gel method. Carbon-encapsulated chlorine-doped Na3V2(PO4)3 composites reveal raised electrochemical performance. Among composites, Na3V2(PO4)2.9Cl0.3@C ([email protected]/Cl-30) with proper chlorine exhibits the best performance. [email protected]/Cl-30 delivers the discharge capacity of 104.2, 86.4, 52.2 mAh g−1 at 40, 1000, 4000 mA g−1, severally, much higher than those of chlorine-undoped composite ([email protected], 74.2, 46.4, 21.1 mAh g−1). Moreover, [email protected]/Cl-30 demonstrates excellent cycling performance (capacity retention: 93.0%, 500 cycles, 800 mA g−1). Outstanding performances is attributed to nanostructure from sol-gel route and synergetic effect of carbon encapsulation and chlorine doping for Na3V2(PO4)3. Nanostructure can shorten migration pathway of sodium ion. Carbon encapsulation and chlorine doping raise electrical and ionic conductivity, respectively. © 2020 Elsevier B.V.
语种:
英文
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Co-pyrolysis characteristics of different reworked synthetic polymer types
作者:
Luo, Wei;Hu, Qing;Fan, Zhong-yi;Wan, Jun;Luo, Bin;...
期刊:
Journal of the Energy Institute ,2020年93(6):2232-2237 ISSN:1743-9671
通讯作者:
Zhou, Zhi
作者机构:
[Fan, Zhong-yi; Wan, Jun; Luo, Wei; Luo, Bin; Zhou, Zhi; Yan, Zhi-xiang; Huang, Sheng-Xiong; Hu, Qing] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;[Luo, Wei] Cent South Univ, Powder Met Res Inst, Changsha 410083, Peoples R China.;[Zhou, Zhi] Hunan Kegu Environm Protect Technol Co Ltd, Changsha 410128, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Sch Chem & Mat Sci, Changsha 410128, Peoples R China.
通讯机构:
[Zhou, Zhi] H;Hunan Agr Univ, Sch Chem & Mat Sci, Changsha 410128, Peoples R China.
关键词:
Reworked synthetic polymer;Co-pyrolysis;Liquid oils;Gases
摘要:
Reworked synthetic polymers (RSPs) are industrial raw materials obtained from waste synthetic polymer (WSP) through physical or chemical means. Different reworked synthetic polymers have different pyrolysis characteristics and synergistic reactions during co-pyrolysis process. The effect of reworked polyamide 6 (PA6), thermoplastic elastomer (TPE), black polypropylene (PP1) and green polypropylene (PP2) co-pyrolysis on the yield and quality of pyrolysis products has been conducted. The results show that co-pyrolysis promotes the degradation of RSPs into more gases. Co-pyrolysis improves the light component of liquid oils and reduces the O content, which is beneficial for liquid fuels. Except for TPE + PP2, co-pyrolysis of RSPs increased di-aromatics, poly-aromatics and aromatic compounds. TPE + PP2 and PP1+PP2 produced high aliphatic compounds including the long chain aliphatic compounds without sufficient degradation, which resulted in the contents of over C-20 were high. In the pyrolysis gases, the relative content of H-2 was increased in all mixed RSPs co-pyrolysis, which can be used as clean fuels. The X-ray diffraction (XRD) analysis shown that new components were found and old components disappeared in co-pyrolysis, indicating chemical reaction had occurred between two different types of RSPs. (C) 2020 Energy Institute. Published by Elsevier Ltd. All rights reserved.
语种:
英文
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Interconnected structure Si@TiO2-B/CNTs composite anode applied for high-energy lithium-ion batteries
作者:
Zhou, Nan;Wu, Yufan;Li, Yiran;Yang, Jiankui;Zhou, Qing;...
期刊:
Applied Surface Science ,2020年500:144026- ISSN:0169-4332
通讯作者:
Xia, Mao;Zhou, Zhi
作者机构:
[Wu, Yufan; Xia, Mao; Zhou, Qing; Yang, Jiankui; Guo, Yuwei; Zhou, Nan; Zhou, Zhi; Xia, M; Li, Yiran] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Wu, Yufan; Xia, Mao; Zhou, Qing; Yang, Jiankui; Guo, Yuwei; Zhou, Nan; Zhou, Zhi; Xia, M; Li, Yiran] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;[Xia, Mao; Yang, Jiankui; Zhou, Nan; Zhou, Zhi; Xia, M] Hunan Agr Univ, Hunan Engn Res Ctr Biochar, Changsha, Hunan, Peoples R China.
通讯机构:
[Xia, M; Zhou, Z] H;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.;Hunan Agr Univ, Hunan Engn Res Ctr Biochar, Changsha, Hunan, Peoples R China.
关键词:
Lithium-ion batteries;[email protected]2-B/CNTs composite;Anode;Coating;Electrochemical kinetics
摘要:
As an anode with ultrahigh capacity (4200 mAh g−1), silicon (Si) has inherent defects, such as drastic volume change (~300%) and poor conductivity. To cope with these problems, constructing a rigid shell (e.g. TiO2) on the surface of Si particles is an effective method. Typically, monoclinic titanium dioxide (TiO2-B) has the more excellent electrochemical performance among the various crystalline of TiO2 (anatase, rutile, etc.) for its open channel and characteristic pseudocapacitive effect. In addition, carbon nanotubes (CNTs) are good conductor of electricity. It is hopeful to increase the conductivity of the Si anode by adding CNTs. In this work, therefore, a Si@TiO2-B/CNTs composite is prepared by hydrothermal method. The composite exhibits superior electrochemical properties during the half-cell test (1184 mAh g−1 under 0.1 A g−1 at 200th cycles). Furthermore, the electrochemical kinetics of the materials were studied by cyclic voltammetry, which demonstrated that coating TiO2-B could increase the capacitive effects of the composite (68.75%). © 2019 Elsevier B.V.
语种:
英文
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In situ synthesis of high-efficiency CsPbBr3/CsPb2Br5composite nanocrystals in aqueous solution of microemulsion
作者:
Lou, Sunqi;Zhou, Zhi* ;Gan, Weijiang;Xuan, Tongtong;Bao, Zhen;...
期刊:
Green Chemistry ,2020年22(16):5257-5261 ISSN:1463-9262
通讯作者:
Wang, Jing;Zhou, Zhi;Liu, Ru-Shi
作者机构:
[Gan, Weijiang; Cao, Luyu; Lou, Sunqi; Si, Shuaichen; Wang, Jing] Sun Yat Sen Univ, Sch Chem, Sch Mat Sci & Engn, Minist Educ,Key Lab Bioinorgan & Synthet Chem,Sta, Guangzhou 510275, Guangdong, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha 10128, Hunan, Peoples R China.;[Xuan, Tongtong] Xiamen Univ, Coll Mat, Xiamen 361005, Peoples R China.;[Bao, Zhen; Liu, Ru-Shi] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan.;[Bao, Zhen; Liu, Ru-Shi] Natl Taiwan Univ, Adv Res Ctr Green Mat Sci & Technol, Taipei 106, Taiwan.
通讯机构:
[Wang, Jing] S;[Zhou, Zhi] H;[Liu, Ru-Shi] N;Sun Yat Sen Univ, Sch Chem, Sch Mat Sci & Engn, Minist Educ,Key Lab Bioinorgan & Synthet Chem,Sta, Guangzhou 510275, Guangdong, Peoples R China.;Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha 10128, Hunan, Peoples R China.
摘要:
Here, we present the microemulsion method using sodium dodecylbenzenesulfonate and hydrofluoric acid for the in situ synthesis of brightly luminescent CsPbBr3/CsPb2Br5 composite nanocrystals (NCs) in aqueous solution. The obtained CsPbBr3/CsPb2Br5 composite NCs exhibit a photoluminescence quantum yield of 77.0% and a full width at half maximum of 16.0 nm. And solid-state back-lighting devices were fabricated by combining CsPbBr3/CsPb2Br5 composite NCs and red-emitting K2SiF6:Mn4+ phosphors with blue light. The as-fabricated device exhibits a wide color gamut of about 95.8% of the Rec. 2020. This work provides a green, low-cost, and in situ water-phase route to synthesize high-quality cesium lead halide NCs for their practical applications in solid-state back-lighting devices. This journal is © The Royal Society of Chemistry.
语种:
英文
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应急救援专业人才理性素养及其培育路径研究
作者:
刘淑贞;张开福;徐波
期刊:
湖南安全与防灾 ,2020年(4):42-44 ISSN:1007-9947
作者机构:
湖南安全技术职业学院基础教育学院;湖南安全技术职业学院安全保障学院;湖南农业大学公共管理学院;[徐波] 湖南农业大学;[张开福; 刘淑贞] 湖南安全技术职业学院
关键词:
应急救援;专业人才;理性素养;培育路径
摘要:
高质量的应急救援专业人才不仅要具有专业的救援知识、救援技能,还需要有面临现实救援任务情境的理性素养,理性素养能促进救援人员临危不惧、有序有章、科学动态地处理问题,高效率的完成任务。为提应急救援专业人才理性素养,需要从理论上探究理性素养的内涵定义及特征,分析应急救援专业人才理性素养的现状和存在的问题,在此基础上,对应急救援专业人才理性素养的培育路径提出建议。
语种:
中文
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Influence of Adding Chinese Yam (Dioscorea opposita Thunb.) Flour on Dough Rheology, Gluten Structure, Baking Performance, and Antioxidant Properties of Bread
作者:
Li, Qing-Ming;Li, Yan;Zou, Jin-Hao;Guo, Shi-Yin;Wang, Feng;...
期刊:
Foods ,2020年9(3) ISSN:2304-8158
通讯作者:
Su, Xiao-Jun
作者机构:
[Zou, Jin-Hao; Li, Qing-Ming; Su, Xiao-Jun; Guo, Shi-Yin; Li, Yan; Wang, Feng] Hunan Agr Univ, Coll Food Sci & Technol, Changsha 410128, Peoples R China.;[Li, Qing-Ming; Su, Xiao-Jun; Wang, Feng] Hunan Prov Res Ctr Engn & Technol Fermented Food, Changsha 410128, Peoples R China.;[Yu, Peng] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
通讯机构:
[Su, Xiao-Jun] H;Hunan Agr Univ, Coll Food Sci & Technol, Changsha 410128, Peoples R China.;Hunan Prov Res Ctr Engn & Technol Fermented Food, Changsha 410128, Peoples R China.
关键词:
antioxidant property;bread;gluten structure;rheology;yam
摘要:
Impacts of wheat flour substituted with various levels of Chinese yam (Dioscorea opposita Thunb.) flour (from 0% to 25%) on the dough rheological characteristics, gluten structure, baking performance, and antioxidant properties of bread were investigated. The water absorption increased significantly (p < 0.05), while development time and stability decreased remarkably (p < 0.05) as the proportion of yam flour increased. SEM results indicated that the addition of yam flour destroyed the gluten network structure in the dough. Fourier Transform Infrared Spectroscopy (FTIR) spectra showed that addition of yam flour decreased the content of α-helix and β-sheet in gluten. With the increase in the proportion of yam flour, the specific volume and overall acceptability decreased (p < 0.05) whereas the total phenolics content (TPC), polysaccharides content, total flavonoids content (TFC), allantoin content, The 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging capability, fractal dimension, and hardness increased (p < 0.05). Overall, breads made of wheat flour replacement with no more than 15% Guihuai number 2 yam flour were of a high quality and had more antioxidant properties. These showed that Guihuai number 2 had broad application prospects in baked products. © 2020 by the authors.
语种:
英文
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不同产地多花黄精生物活性成分含量差异比较研究(英文)
作者:
王丹;张鸿;刘嘉丽;满琪;董新荣;...
期刊:
农业科学与技术(英文版) ,2020年21(04):50-57 ISSN:1009-4229
作者机构:
湖南农业大学理学院,湖南 长沙 410128;湖南农业大学分析测试中心,湖南 长沙 410128;湖南崇舜堂科技有限公司,湖南长沙 410208;[满琪; 刘嘉丽; 王丹; 刘德明; 张鸿; 董新荣] 湖南农业大学;[黄立新] 湖南崇舜堂科技有限公司
关键词:
多花黄精;多糖;总皂苷;总黄酮
摘要:
以5个不同产地的多花黄精为试验材料,采用比色法对其多糖、总皂苷、总黄酮3种生物活性成分的含量进行了测定与分析比较.结果表明:多花黄精中的生物活性成分含量因产地不同而存在着较大差异,多糖含量在8.09%~11.78%范围内变化,以娄底地区的最高;总皂苷含量范围为2.73%~5.01%,以永州地区的最高;总黄酮含量范围为0.21%~0.71%,以张家界地区及四川省的较高.总体来看,不同产地多花黄精中多糖含量均较高,总皂苷含量居中,总黄酮含量均较低.
语种:
中文
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Julia sets as buried Julia components
作者:
Wang, Youming* ;Yang, Fei
期刊:
TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY ,2020年373(10):7287-7326 ISSN:0002-9947
通讯作者:
Wang, Youming
作者机构:
[Wang, Youming] Hunan Agr Univ, Dept Appl Math, Changsha 410128, Peoples R China.;[Yang, Fei] Nanjing Univ, Dept Math, Nanjing 210093, Peoples R China.
通讯机构:
[Wang, Youming] H;Hunan Agr Univ, Dept Appl Math, Changsha 410128, Peoples R China.
关键词:
Julia sets;buried component;singular perturbations
摘要:
Let f be a rational map with degree d\geq 2 whose Julia set is connected but not equal to the whole Riemann sphere. It is proved that there exists a rational map g such that g contains a buried Julia component on which the dynamics is quasiconformally conjugate to that of f on the Julia set if and only if f does not have parabolic basins and Siegel disks. If such g exists, then the degree can be chosen such that \deg (g)\leq 7d-2. In particular, if f is a polynomial, then g can be chosen such that \deg (g)\leq 4d+4. Moreover, some quartic and cubic rational maps whose Julia sets contain buried Jordan curves are also constructed.
语种:
英文
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High thermal stability and blue-violet emitting phosphor CaYAlO_4:Ti~(4+) with enhanced emission by Ca~(2+) vacancies
作者:
Xia, Mao;Zhang, Yongli;Li, Minghui;Zhong, Yuan;Gu, Simin;...
期刊:
稀土学报(英文版) ,2020年38(3):227-233 ISSN:1002-0721
通讯作者:
Zhou, Nan;Zhou, Zhi
作者机构:
[Xia, Mao; Zhang, Yongli; Zhong, Yuan; Zhou, Nan; Zhou, Zhi; Li, Minghui; Gu, Simin] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;[Xia, Mao; Zhang, Yongli; Zhong, Yuan; Zhou, Nan; Zhou, Zhi; Gu, Simin] Hunan Opt Agr Engn Technol Res Ctr, Changsha 410128, Peoples R China.;[Xia, Mao] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.
通讯机构:
[Zhou, N; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.
关键词:
Blue-violet-emitting;Ca2+ vacancies;Phosphors;Plant growth lighting;Ti4+-activated
摘要:
Blue-violet light can not only enhance the total content of biomass and glucoside but also enrich the taste of the fruit. Thus, it is meaningful to study the blue-violet luminescent materials for plant cultivation. In this study, titanium (IV) -activated CaYAlO4 (CYAO) phosphors were synthesized by conventional high-temperature solid-state reaction. X-ray powder diffraction was employed to analyze the crystal-structure of CYAO. It is found that the doped Ti4+ ions do not change obviously the crystal structure of phosphors. Upon 246 nm excitation, CaYAl1-xO4:xTi(4+) phosphors exhibit broad blue-violet emission band peaking at 395 nm, which can be attributed to the charge transfer of Ti4+-O2-. Moreover, this phosphor exhibits strong thermal stability. The luminescence emission intensity at 150 degrees C maintained about 91 mol% of its initial value at room temperature. Additionally, the electron transition process and concentration quenching mechanism of CaYAl1-xO4:xTi(4+)are discussed in detail. The excellent luminescent properties indicate that CaYAl1-xO4:xTi(4+) phosphor may have promising application in indoor plant cultivation. Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.
语种:
英文
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