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Investigation on property and mechanism of redox wave of methylhesperidine at Hg electrode

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Science China Chemistry 2005年第Z1期48卷 20-24页

作者： ZHENG Jianbin MENG Zuchao zhang hongfang Institute of Analytical Science/Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry Northwest University Xi'an 710069 China Institute of Analytical Science/Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry Northwest University Xi'an 710069 China Institute of Analytical Science/Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry Northwest University Xi'an 710069 China

The voltammetric behaviors of methylhesperidine (MH) were studied by means of linear sweep voltammetry, cyclic voltammetry and normal pulse voltammetry. In the Brit ton-Robinson buffer solutions with pH values from 2.05 to 6.37, MH could yield three reduction waves PC1, PC2 and PC3. PC1 wave is an adsorptive pre-wave. PC2 wave is an irreversible reduc tion of pre-protonated MH involving one electron and one proton. PC3 wave is an irreversible wave of reduction species radical of MH involving one electron.

关键词： voltammetric behavior, polarography, mechanism, reduction, methylhesperidine.

Enhanced pyrocatalysis of the pyroelectric BiFeO_(3)/g-C_(3)N_(4) heterostructure for dye decomposition driven by cold–hot temperature alternation

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Journal of Advanced Ceramics 2021年第2期10卷 338-346页

作者： Mingzi Chen Yanmin Jia Huamei Li Zheng Wu Tianyin Huang hongfang zhang College of Physics and Electronic Information Engineering Zhejiang Normal UniversityJinhua321004China School of Science Xi’an University of Posts and TelecommunicationsXi’an710121China College of Environmental and Chemical Engineering Xi’an Polytechnic UniversityXi’an710048China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and Technology and School of Environmental Science and EngineeringSuzhou University of Science and TechnologySuzhou215009China

The BiFeO_(3)/g-C_(3)N_(4) heterostructure,which is fabricated via a simple mixing–calcining method,benefits the significant enhancement of the pyrocatalytic *** the growth of g-C_(3)N_(4) content in the heterostructure pyrocatalysts from 0 to 25%,the decomposition ratio of Rhodamine B(RhB)dye after 18 cold-hot temperature fluctuation(25-65℃)cycles increases at first and then decreases,reaching a maximum value of~94.2%at 10%while that of the pure BiFeO_(3) is~67.7%.The enhanced dye decomposition may be due to the generation of the internal electric field which strengthens the separation of the positive and negative carriers and further accelerates their *** intermediate products in the pyrocatalytic reaction also have been detected and confirmed,which proves the key role of the pyroelectric effect in realizing the dye decomposition using BiFeO_(3)/g-C_(3)N_(4) heterostructure *** pyroelectric BiFeO_(3)/g-C_(3)N_(4) heterostructure shows the potential application in pyrocatalytically degrading dye wastewater.

关键词： pyroelectric material BiFeO_(3) g-C_(3)N_(4) heterostructure pyrocatalysis

A Hydrogen Peroxide Sensor Based on Silver Nanoparticles Biosynthesized by Bacillus subtilis

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Chinese Journal of Chemistry 2013年第12期31卷 1519-1525页

作者： Ruixiao Liu Yahui Wei Jianbin Zheng hongfang zhang Qinglin Sheng Institute of Analytical Science/Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry Northwest University Xi'an Shaanxi 710069 China Key Laboratory of Resources Biology and Biotechnology in Western China Ministry of Educational Northwest University Xi' an Shaanxi 710069 China

In this study, silver nanoparticles （AgNPs） were biosynthesized by Bacillus subtilis and used to construct a nonenzymatic hydrogen peroxide （H202） sensor, Scanning electron microscopy, transmission electron microscopy and energy dispersive spectroscopy confirmed that the AgNPs were prepared successfully with spherical morphol- ogy. The electrochemical properties of the resulted sensor were investigated by cyclic voltammetry, chronoam- perometry and electrochemical impedance spectroscopy. It was found that the sensor exhibited good electrocatalytic activity towards H202 reduction with a wider linear range from 0.05 to 120 mmol.L-1, a detection limit of 8 gmol.L-1 and a fast response time less than 2 s. The sensor exhibited good selectivity for H202 determination in the presence of glucose, acetaminophen, ascorbic acid and uric acid.

关键词： sensor biosynthesis Bacillus subtilis silver nanoparticles hydrogen peroxide

Progress in oscillographic chronopotentiometry

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Science China Chemistry 2005年第Z1期48卷 1-8页

作者： GAO Hong zhang hongfang ZHOU Yuanzhen ZHENG Xiaohui ZHENG Jianbin Institute of Analytical Science/Shaanxi Provincial Key Lab of Electroanalytical Chemistry Northwest University Xi'an 710069 China Institute of Analytical Science/Shaanxi Provincial Key Lab of Electroanalytical Chemistry Northwest University Xi'an 710069 China Institute of Analytical Science/Shaanxi Provincial Key Lab of Electroanalytical Chemistry Northwest University Xi'an 710069 China Institute of Analytical Science/Shaanxi Provincial Key Lab of Electroanalytical Chemistry Northwest University Xi'an 710069 China Institute of Analytical Science/Shaanxi Provincial Key Lab of Electroanalytical Chemistry Northwest University Xi'an 710069 China

The investigation on oscillographic chronopotentiometry after 2000 is reviewed. The development course of oscillographic chronopotentiometry is looked back. Some new instrumentations and new methods about oscillographic chronopotentiometry as well as applications of chemometrics in oscilloanalysis are introduced. The prospects of oscillographic chronopotentiometry development are also discussed in this paper.

关键词： virtual instrument, chemometrics, oscillographic chronopotentiometry, oscillographic analysis.

Conflict Resolution Based on Collaborative Design of Grid Services

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Wuhan University Journal of Natural Sciences 2008年第4期13卷 490-494页

作者： LUO Zuomin zhang Jing ZHOU hongfang CHEN Xinhua School of Computer Science and Engineering Xi＇an University of Technology Xi＇an 710048 Shaanxi China

To the issues of low efficiency of conflict resolution method in collaborative design, we proposed a method, which is conflict resolution about collaborative design based on grid *** uses the grid services from the current design points, uses the method of retrospective thinking to find the conflict point by detecting, and then uses the corresponding method to resolve the conflict point according to the conflict characteristic, after that carried on the conflict detection again. If there is still the conflict, resolve the conflict point again, until the conflict no longer exists. This method combines various traditional resolution methods, makes full use of the grid idle high-performance large-scale sharing resources. With this method the collaborative design conflict resolution cost reduced and the conflict resolution efficiency was raised. And then the problem which is not handled completely was then solved, so that the conflict resolution Quality was guaranteed.

关键词： grid services collaborative design conflict resolution conflict characteristic conflict detection

The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

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Eye and Vision 2020年第5期7卷 300-311页

作者： Yune Zhao Ding Chen Giacomo Savini Qing Wang hongfang zhang Yili Jin Benhao Song Rui Ning Jinhai Huang Chenyang Mei School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical UniversityWenzhouZhejiangChina Key Laboratory of Vision Science Ministry of Health P.R.ChinaWenzhouZhejiangChina G.B.Bietti Foundation IRCCS RomeItaly Eye Hospital of Wenzhou Medical University 270 West Xueyuan RoadWenzhou 325027ZhejiangChina

Purpose:To assess the repeatability and reproducibility of swept-source optical coherence tomography(SS-OCT)and Scheimpflug system and evaluate the agreement between the two systems in measuring multiple corneal regions in ***:Pachymetric and keratometric maps for both systems were ***,midperipheral and peripheral corneal thickness(CT),keratometry and astigmatism power vectors were *** three outcomes yielded by the same observer were used to assess intraobserver *** differences in the mean values provided by each observer were used to evaluate interobserver ***-subject standard deviation,test-retest repeatability(TRT)and coefficient of variation(CoV)were used to analyze the intraobserver repeatability and interobserver *** T-test and Bland-Altman were used to appraise interdevice ***:Seventy-eight eyes of 78 children were *** CoV was≤2.12 and 1.10%,respectively,for repeatability and *** and CoV were lower for central and paracentral CT measurements than for peripheral *** SS-OCT device generated higher precision when acquiring CT data,whereas Scheimpflug system showed higher reliability when measuring corneal *** the CT readings measured using SS-OCT were significantly thinner than Scheimpflug device(P<0.001),the central and thinnest CT values were still of high *** interdevice agreement of keratometry measurement was high for the central corneal region and moderate for the paracentral and peripheral ***:The precision of CT measurements by SS-OCT was higher,while the reliability of keratometry measurements by the Scheimpflug system was higher in *** from the measured values in the central corneal region,the thickness and keratometry readings should not be considered interchangeable between the two systems.

关键词： Central corneal thickness Children Precision Paracentral corneal thickness Peripheral corneal thickness Keratometry Swept-source optical coherence tomography Scheimpflug imaging

Modulating low-frequency tribocatalytic performance through defects in uni-doped and bi-doped SrTiO_(3)

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Journal of Advanced Ceramics 2024年第8期13卷 1153-1163页

作者： Yjing Xu Yingzhi Meng Xu Xiang Qing Tang hongfang zhang Lajun Liu Ju Gao Bo Xu Renhong Liang Longlong Shu Yanmin Jia Wanping Chen School of Physical Science and Technology Suzhou University of Science and TechnologySuzhou 215009China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004China Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China School of Science and Key Laboratory of Biomedical Functional Materials China Pharmaceutical UniversityNanjing 211198China School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China School of Physics and Materials Science Nanchang UniversityNanchang 330031China School of Physics and Information Technology Shaanxi Normal UniversityXi'an 710062China School of Physics and Technology Wuhan UniversityWuhan 430072China

Triboelectrification,a process that transforms mechanical energy into electrical energy through friction,holds promise for eco-friendly wastewater *** study delves into the enhancement of tribocatalytic dye degradation using SrTiO_(3),a material notable for its non-piezoelectric and centrosymmetric *** synthesis of uni-and bi-doped SrTiOs particles,achieved through a solid-state reaction at 100℃,results in a high-purity cubic perovskite *** with rhodium(Rh)and carbon(C)causes crystal lattice contraction,internal stress,and significant oxygen *** changes notably improve tribocatalytic efficiency under solar irradiation,with Rh-doped SrTiO_(3) demonstrating an impressive degradation rate of approximately 88% for Rhodamine B(RhB),along with reaction rate constants near 0.9 h^(-1) at 554 nm and a noticeable *** study highlights that defects introduced by doping are integral to this process,boosting catalytic activity through energy state modification and enhancing surface redox radical ***,these defects are instrumental in generating a flexoelectric field,which markedly influences the separation of electron-hole pairs under solar *** findings illuminate the complex interplay between material composition,defect states,and environmental conditions,paving the way for advanced strategies in environmental remediation through optimized tribocatalytic activity.

关键词： tribocatalysis SrTiO_(3)(STO) doping-induced defects blueshift flexoelectric field

Simultaneous achievement of large electrocaloric effect and ultrawide operating temperature range in BaTiO_(3)-based lead-free ceramic

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Journal of Advanced Ceramics 2024年第8期13卷 1234-1241页

作者： Zhaojie Wang Yingzhi Meng Silin Tang Xiang Niu hongfang zhang Dingyuan Wang Yisong Bai Bialin Peng Xue Chen Qingqing Ke Sheng-Guo Lu Laijun Liu Guangxi Key Lab of Optical and Electronic Functional Materials and Devices Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of ResourcesCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China School of Microelectronics Science and Technology Sun Yat-sen UniversityZhuhai 519082China Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China School of Physical Science and Technology&Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China Qingdao Haier Smart Technology R&D Co. Ltd.Qingdao 266100China School of Advanced Materials and Nanotechnology Xidian UniversityXi'an 710071China Guangxi Key Laboratory of Manufacturing System&Advanced Manufacturing Technology Guilin University of Electronic TechnologyGuilin 541004China

The electrocaloric effect(ECE),known for its environmentally friendly characteristics,holds significant promise for advancing next-generation solid-state refrigeration *** a large ECE along with a wide working temperature range near room temperature remains a key developmental *** this study,we successfully obtained a substantial ECE of 1.78 K and an extensive working temperature range of 103 K(AT>1.52 K)near room temperature in CaZrO_(3)-modified BaTiO_(3) lead-free ferroelectric ***,this achievement was verified using direct *** piezoresponse force microscopy(PFM)results suggest that the broad temperature range is attributed to the formation of ferroelectric microdomains and polar nanoregions(PNRs).Furthermore,X-ray photoelectron spectroscopy(XPS)and ultraviolet-visible(UV-Vis)spectroscopy reveal a decrease in the oxygen vacancy concentration and an increase in the bandgap for higher CaZrO_(3) doping *** changes synergistically enhance the maximum applied electric field,helping to achieve a high-performance EcE near room *** research presents a straightforward and effective approach for achieving high-performance ECEs in BaTiOg lead-free ceramics,offering promising prospects for application in next-generation solid-state refrigeration technologies.

关键词： BaTiO_(3) electrocaloric effect oxygen vacancy band-gap

专利权质押出质企业和非专利权质押出质企业融资效率比较分析研究

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科学学与科学技术管理 2018年第12期39卷 111-122页

作者：张红芳同济大学经济与管理学院上海200092

应用数据包络法通过DEA-BCC静态模型和DEA-Malmquist动态模型,从静态角度分析了2014年—2016年新三板上100家专利权质押出质企业和100家基础层以及100家创新层非专利权质押出质企业的静态效率中综合技术效率、纯技术效率和规模效率在不... 详细信息

应用数据包络法通过DEA-BCC静态模型和DEA-Malmquist动态模型,从静态角度分析了2014年—2016年新三板上100家专利权质押出质企业和100家基础层以及100家创新层非专利权质押出质企业的静态效率中综合技术效率、纯技术效率和规模效率在不同融资效率区间变化趋势,以及从动态角度分析了这些企业动态融资效率中全要素生产指数变动、技术效率变化、技术变化、纯技术效率变化、规模效率变化在不同年份的变化趋势。

关键词：数据包络分析法专利权质押出质企业融资效率