检索结果-南通市图书馆

Two-dimensional nanomaterials confined single atoms: New opportunities for environmental remediation

在线全文

学校读者我要写书评

暂无评论

Nano Materials Science 2023年第1期5卷 15-38页

作者： Yu Yin Lei Shi shu Zhang Xiaoguang Duan Jinqiang Zhang Hongqi Sun Shaobin wa.g School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212100China Joint International Research Laboratory of Biomass Energy and Materials College of Materials Science and EngineeringNanjing Forestry UniversityNanjing210037China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA5005Australia School of Science Edith Cowan UniversityJoondalupWA6027Australia

Two-dimensional(2D)supports confined single-atom catalysts(2D SACs)with unique geometric and electronic structures have been attractive candidates in different catalytic applications,such as energy conversion and storage,value-added chemical synthesis and environmental ***,their environmental appli-cations lack of a comprehensive summary and in-depth *** this review,recent progresses in synthesis routes and advanced characterization techniques for 2D SACs are introduced,and a comprehensive discussion on their applications in environmental remediation is ***,2D SACs can be effective in catalytic elimination of aqueous and gaseous pollutants via radical or non-radical routes and transformation of toxic pollutants into less poisonous species or highly value-added products,opening a new horizon for the contami-nant *** addition,in-depth reaction mechanisms and potential pathways are systematically discussed,and the relationship between the structure-performance is ***,several critical challenges within this field are presented,and possible directions for further explorations of 2D SACs in environmental remediation are *** the research of 2D SACs in the environmental application is still in its infancy,this review will provide a timely summary on the emerging field,and would stimulate tremendous interest for designing more attractive 2D SACs and promoting their wide applications.

关键词： Single-atom catalysis Two-dimensional material Advanced oxidation process Degradation Transformation Industrial wastewater

Electrolyte materials for protonic ceramic electrochemical cells:Main limitations and potential solutions

在线全文

学校读者我要写书评

暂无评论

Materials Reports(Energy) 2022年第4期2卷 19-35页

作者： Anna V.Kasyanova Inna A.Zvonareva natalia A.Tarasova Lei Bi Dmitry A.Medvedev Zongping Shao Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes Institute of High Temperature Electrochemistry620990YekaterinburgRussia Hydrogen Energy Laboratory Ural Federal University620002YekaterinburgRussia School of Resource and Environment and Safety Engineering University of South ChinaHengyangHunan421001China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing210009China wa School of Mines:Minerals Energy and Chemical Engineering(WASM-MECE)Curtin UniversityPerthWA6845Australia

Solid oxide fuel cells(SOFCs)and electrolysis cells(SOECs)are promising energy conversion devices,on whose basis green hydrogen energy technologies can be developed to support the transition to a carbon-free *** compared with oxygen-conducting cells,the operational temperatures of protonic ceramic fuel cells(PCFCs)and electrolysis cells(PCECs)can be reduced by several hundreds of degrees(down to low-and intermediatetemperature ranges of 400–700C)while maintaining high performance and *** is due to the distinctive characteristics of charge carriers for proton-conducting ***,despite achieving outstanding lab-scale performance,the prospects for industrial scaling of PCFCs and PCECs remain hazy,at least in the near future,in contrast to commercially available SOFCs and *** this review,we reveal the reasons for the delayed technological development,which need to be addressed in order to transfer fundamental findings into industrial *** solutions to the identified problems are also highlighted.

关键词： Protonic ceramic fuel cells(PCFCs) Protonic ceramic electrolysis cells(PCECs) Proton transport Electrochemistry Hydrogen energy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

胶束增敏荧光法测定大鼠血清中荜茇宁

分析测试学报 2016年第2期35卷 225-228,234页

作者：领小苗澍敖登高娃内蒙古大学化学化工学院内蒙古呼和浩特010021

蒙药荜茇有效成分荜茇宁具有荧光,且荧光可被表面活性剂吐温-20增敏,同时,其同步荧光光谱能消除血清样品的背景荧光对荜茇宁荧光光谱的干扰,据此建立了直接测定大鼠血清中荜茇宁浓度的新方法。荜茇宁的线性范围为5.47×10^(-3)~3.28μg... 详细信息

蒙药荜茇有效成分荜茇宁具有荧光,且荧光可被表面活性剂吐温-20增敏,同时,其同步荧光光谱能消除血清样品的背景荧光对荜茇宁荧光光谱的干扰,据此建立了直接测定大鼠血清中荜茇宁浓度的新方法。荜茇宁的线性范围为5.47×10^(-3)~3.28μg·m L^(-1),检出限为1.20×10^(-3)μg·m L^(-1),样品回收率为100.6%,相对标准偏差为2.7%。方法可用于大鼠血清样品中荜茇宁浓度的直接测定。

关键词：荜茇宁胶束体系荧光分析法血清

State Transition Induced by Self-Steepening and Self Phase-Modulation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2014年第1期31卷 33-36页

作者： Jing-Song, He shu-Wei, Xu Ruderman, M. S. Erdélyi, R. Department of Mathematics Ningbo University Ningbo 315211 DAMTP University of Cambridge Cambridge CB3 0WA UK School of Mathematics University of Science and Technology of China Hefei 230026 Solar Physics and Space Plasma Research Centre University of Sheffield Sheffield S3 7RH UK

We present a rational solution for a mixed nonlinear Schr6dinger （MNLS） equation. This solution has two free parameters, a and b, representing the contributions of self-steepening and self phase-modulation （SPM） of an associated physical system, respectively. It describes five soliton states： a paired bright-bright soliton, a single soliton, a paired bright-grey soliton, a paired bright-black soliton, and a rogue wave state. We show that the transition among these live states is induced by self-steepening and SPM through tuning the values of a and b. This is a unique and potentially fundamentally important phenomenon in a physical system described by the MNLS eauation.

关键词： SCHRODINgER equation SELF-phase modulation NONLINEAR optics RESEARCH SOLITONS

Transboundary hydrological effects of hydropower dam construction on the Lancang River

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2006年第B11期51卷 16-24页

作者： HE Daming FENg Yan gAN shu Darrin Magee YOU Weihong Asian International Rivers Center Yunnan University Kunming 650091 China Department of geography University of Washington Seattle WA 98195 USA School of Resource Environment and Earth Science Yunnan University Kunming 650091 China

Ecological and socioeconomic issues in the greater Mekong Subregion have in recent years attracted increasing regional and global attention. Much of this concern has been centered on construction of a cascade of hydropower dams on the Lancang River (upper Mekong River) in southwestern China's Yunnan Province. This article uses monthly runoff data of hydrologic monitoring stations in the Lancang River watershed from the 1950s onward and key data of the partially completed 2-dam cascade on the main stream of Lancang River to perform a comprehensive analysis of possible transboundary hydrologic effects of dam construction on Lower Mekong River. Results of the analysis show the following: (1) changes in flows over the Lancang-Mekong river's 4880 km course are exceedingly complex, and the two existing dams on the mainstream of Lancang River are but one of many factors influencing those flows, not a major factor; (2) significant downstream impacts of the two existing dams are limited in scale to changes in daily flow stages, and are limited geographically to the narrow channel north of Vientiane; (3) over timescales of several days or more, the primary factor in flow changes is climate change; (4) below the Yunjinghong hydrologic station in Lancang River basin, flow volumes can be as great as 113.7x10(8) m(3), or 15.44% of the average annual total runoff out of China, now are not influenced by the dam construction. These results provide a scientific basis for reasonable assessment of transboundary impact of dam construction on the mainstream of Lancang River to the lower Mekong River.

关键词：贯穿边界水文效应水坝建筑澜沧江-湄公河中国西南东亚

In situ preparation of visible-light-driven carbon quantum dots/NaBiO3 hybrid materials for the photoreduction of Cr(Ⅵ)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2021年第1期33卷 100-109页

作者： Yixiao Wu Chunlong Chen shu He Xuesong Zhao Shaobin Huang gongchang Zeng Yingying You Ying Cao Lishan Niu School of Environment and Energy South China University of TechnologyHigher Education Mega CenterGuangzhou 510006China Qiannan Normal University for Nationalities Duyun 558000China Physical Sciences Division Physical and Computational Sciences DirectoratePacific Northwest National LaboratoryRichlandWA 99354USA Department of Chemical Engineering University of WashingtonSeattleWA 98101USA School of Enuironment Higher Education Mega CenterHarbin Institute of TechnologyHarbin 150000China

In this study,different carbon quantum dots(CQDs)/NaBiO3 hybrid materials were synthesized as photocatalysts to effectively utilize visible light for the photocatalytic degradation of contaminants *** hybrid materials exhibit an enhanced photocatalytic reduction of hexavalent chromium(Cr(Ⅵ))in the aqueous ***-dimensional nanoparticles of CQDs were embedded within the two-dimensional NaBiO3 nanosheets by the hydrothermal *** with that of the pure NaBiO3 nanosheets,the photocatalytic performance of the hybrid catalysts was significantly high and 6 wt.%CQDs/NaBiO3 catalyst exhibited better photocatalytic *** performed the first-principles density functional theory calculations to study the interfacial properties of pure NaBiO3 nanosheets and hybrid photocatalysts,and confirmed the CQDs played an important role in the CQDs/NaBiO3 *** experimental results indicated that the enhanced reduction of Cr(Ⅵ)was probably due to the high loading of CQDs(electron acceptor)on NaBiO3,which made NaBiO3 nanomaterials to respond in visible light and significantly improved their electron-hole separation efficiency.

关键词： Carbon quantum dots/NaBiO3 Hybrid materials Visible light response Cr(Ⅵ)reduction

在线全文

学校读者我要写书评

暂无评论

快速测定生产中纳他霉素含量的方法探讨

中国食品添加剂 2010年第3期21卷 232-236页

作者：谢鹏梁淑娃黄宜辉广州市微生物研究所广州510250

针对目前国内外纳他霉素含量测定使用HPLC方法,对仪器和操作人员要求高,生产过程又需要快速测定其含量的实际情况,比较了用甲醇溶液、1%乙酸的甲醇溶液、丙二醇溶液三种萃取剂对含纳他霉素样品的萃取效果,最终确定以丙二醇溶液为萃取剂... 详细信息

针对目前国内外纳他霉素含量测定使用HPLC方法,对仪器和操作人员要求高,生产过程又需要快速测定其含量的实际情况,比较了用甲醇溶液、1%乙酸的甲醇溶液、丙二醇溶液三种萃取剂对含纳他霉素样品的萃取效果,最终确定以丙二醇溶液为萃取剂,萃取时间可选择9m in,用紫外分光光度法（UV）在303nm作为它的检测波长,来测定纳他霉素含量。制作的工作曲线相关系数r=0.9998,回归方程为y=0.1057x＋0.0074。UV法与HPLC法的测定结果经统计检验,认为无显著差异（ɑ=0.05）,回收率为99.54%~99.74%。该方法简单、快速、准确,分析过程对人体健康危害轻,可在生产中快速测定纳他霉素含量。为了防止纳他霉素在紫外线下降解生成的四氮烯纳他酸干扰UV法测定,使用该方法测定时必须定期用国家标准HPLC法来对照、校正。

关键词：纳他霉素萃取剂丙二醇紫外分光光度法

在线全文

学校读者我要写书评

暂无评论

基于谱-效关系的辽东楤木叶质量评价研究

中草药 2023年第7期54卷 2172-2181页

作者：邹淑君贾力维吕邵娃管庆霞张又天李靖许树军黑龙江中医药大学药学院黑龙江哈尔滨150040 黑龙江中医药大学实验实训中心黑龙江哈尔滨150040

目的建立辽东楤木Aralia elata叶指纹图谱,并寻找能够反映辽东楤木叶抗肿瘤活性能力的质量评价方法。方法采用70%乙醇和水饱和的正丁醇提取各批次辽东楤木叶总皂苷,运用HPLC-ELSD测试分析皂苷并建立指纹图谱,MTT法测试楤木叶总皂苷和单... 详细信息

目的建立辽东楤木Aralia elata叶指纹图谱,并寻找能够反映辽东楤木叶抗肿瘤活性能力的质量评价方法。方法采用70%乙醇和水饱和的正丁醇提取各批次辽东楤木叶总皂苷,运用HPLC-ELSD测试分析皂苷并建立指纹图谱,MTT法测试楤木叶总皂苷和单体皂苷对人肺腺癌A549细胞、人肝癌SMMC-7221细胞、人结肠癌HT-29细胞的抑制作用,用灰色关联法分析指纹图谱峰与抗肿瘤作用之间的关系。结果建立了含有28个共有峰的辽东楤木叶HPLC-ELSD指纹图谱,各批次图谱与共有模式图谱间相似度在0.850以上,指认并归属其中5个峰成分。各批次楤木叶总皂苷抗肿瘤作用的半数抑制浓度(half inhibitory concentration,IC50)为7.39~79.13 mg/L,其中,黑龙江凤凰山7月的样品抗肿瘤效果最佳。谱-效相关性表明28个共有峰成分与抗肿瘤活性的关联度为0.4692~0.8103,其中10个成分与抗肿瘤活性间的关联度大于0.70,8个成分与抗肿瘤活性间的关联度小于0.60。图谱中有2个峰成分在各批次药材中含量都相当大,但谱-效关联度却很小。5个已知的峰成分中,楤木皂苷TTP和楤木皂苷Ⅴ抗肿瘤作用的IC50均小于190 mg/L,楤木皂苷Ⅳ、Ⅵ、Ⅶ抗肿瘤作用的IC50均大于200 mg/L。结论辽东楤木叶HPLC指纹图谱及抗肿瘤相关性分析可以为辽东楤木叶的质量评价提供参考。若从已知的5种楤木皂苷中挑选质量控制成分,楤木皂苷TTP和Ⅴ要优于楤木皂苷Ⅳ、Ⅵ、Ⅶ。

关键词：辽东楤木叶 HPLC指纹图谱抗肿瘤作用灰关联分析楤木皂苷Ⅳ 楤木皂苷Ⅴ 楤木皂苷Ⅵ 楤木皂苷Ⅶ 楤木皂苷TTP

Structure Design and Properties of Three-Layer Particleboard Based on High Voltage Electrostatic Field(HVEF)

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2021年第8期9卷 1433-1445页

作者： Man Yuan Lu Hong Zehui Ju Wenli gu Biqing shu Jianxin Cui Xiaoning Lu Zhiqiang wa.g College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China

In this study,the effects of three different particle sizes of wood wastes(A=–8+12 mesh;B=–12+20 mesh;C=–20+30 mesh)and factory shavings(D)on the properties of particleboard were *** to the test results,three-layer particleboard was *** face layers made with mixture of A,B,and *** core layer made with *** ratio of core layer to face layers is 50:***-layer particleboard were fabricated with 12%urea-formaldehyde(UF)resins and three different high voltage electrostatic field intensities(0 kv,30 kv,60 kv).The internal bond(IB)strength,modulus of rupture(MOR),modulus of elasticity(MOE),thickness swelling(TS),and water absorption(wa)of particleboard were *** density distribution of the three-layer particleboard were examined by vertical density profiles(VDP),and the bonding mechanism and functional groups changes in the particles were analyzed by FTIR *** results showed that HVEF treatment intensity play a remarkable role in properties of *** particleboard with higher electrostatic field intensities treatment has higher MOE,MOR,IB,and *** HVEF treatment(60 kv),the MOR,modulus of MOE,and IB of three-layer particleboard were 23.61 N/mm^(2),2787.09 N/mm^(2),and 0.86 N/mm^(2),*** indicated that the surface activity of wood particles was increased electric field treatment.

关键词： High voltage electric field three-layer particleboard physical property mechanical property