检索结果-南通市图书馆

Degradation of nitrobenzene-containing wastewater by sequential nanoscale zero valent iron-persulfate process

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2021年第6期6卷 910-919页

作者： Jingjuan qiao Weizhou Jiao Youzhi Liu Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuanShanxi030051China

As nitrobenzene(NB)is structurally stable and difficult to degrade due to the presence of an electron withdrawing group(nitro group).The sequential nanoscale zero valent iron-persulfate(NZVI-Na_(2)S_(2)O_(8))process was proposed in this study for the degradation NB-containing *** results showed that the NB degradation efficiency and the total organic carbon removal efficiency in the sequential NZVINa_(2)S_(2)O_(8)process were 100%and 49.25%,respectively,at a NB concentration of 200 mg L^(-1),a NZVI concentration of 0.75 g L^(-1),a Na_(2)S_(2)O_(8)concentration of 26.8 mmol L^(-1),an initial pH of 5,and a reaction time of 30 min,which were higher than those(88.53%and 35.24%,respectively)obtained in the NZVI/Na_(2)S_(2)O_(8)*** radicals(SO_(4)·-)and hydroxyl radicals(·OH)generated in the reaction were identified directly by electron paramagnetic resonance spectroscopy and indirectly by radical capture experiments,and it was shown that both SO_(4)^(·-)and·OH played a major role in the sequential NZVI-Na_(2)S_(2)O_(8)*** possible pathways involved in the reduction of NB to aniline(AN)and the further oxidative degradation of AN were determined by gas chromatography-mass spectrometry.

关键词： Nanoscale zero valent iron Impinging stream-rotating packed bed Sequential NZVI-Na2S2O8process Nitrobenzene Degradation pathways

First measurement of strong interaction between antiprotons

在线全文

学校读者我要写书评

暂无评论

National Science Review 2016年第2期3卷 154-155页

作者： Huan-qiao Zhang China Institute of Atomic Energy

Our world is made of matter,but matter has a counterpart called antimatter,in which the subatomic particles(protons and electrons)of antimatter have charges opposite to those of ordinary *** an ordinary matter,the protons are positively charged,and the electrons carry negative *** antimatter,the antiprotons are negatively charged,while the antielectrons(called positrons)are positively *** antimatter and matter ever meet,they annihilate in a flash of light.

关键词： First measurement of strong interaction between antiprotons

Sulfide-driven nitrous oxide recovery during the mixotrophic denitrification process

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第3期125卷 443-452页

作者： Cong Yu Sen qiao Jiti Zhou Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education China)School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

We propose a novel sulfide-driven process to recover N_(2)O during the traditional denitrification *** optimum initial sulfide concentration was 120 mg/L,and the N_(2)O percentage in the gaseous products (N_(2)O+N_(2)) was up to 82.9%.Moreover,sulfide involved in denitrification processes could substitute for organic carbon as an electron donor,e.g.,1g sulfide was equivalent to 0.5-2 g COD when sulfide was oxidized to sulfur and *** accumulation of N_(2)O was mainly due to the inhibiting effect of sulfide on nitrous oxide reductase (N_(2)OR),which was induced by the supply insufficiency of electrons from cytochrome c (cyt c) to N_(2)*** the initial sulfide concentration was 120 mg/L,the N_(2)OR activity was only 36.8%of its original *** to the results of cyclic voltammetry,circular dichroism spectra and fluorescence spectra,significant changes in the conformations and protein structures of cyt c were caused by sulfide,and cyt c completely lost its electron transport *** study provides a new concept for N_(2)O recovery driven by sulfide in the denitrification *** addition,the findings regarding the mechanism of the inhibition of N_(2)OR activity have important implications both for reducing emissions of N_(2)O and recovering N_(2)O in the sulfide-driven denitrification process.

关键词： N_(2)O recovery N_(2)OR inhibition Cytochrome c Electron transfer capacity

Modeling and analysis of an inextensible beam with inertial and geometric nonlinearities

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2024年第12期45卷 2113-2130页

作者： Zhanhuan YAO Tieding GUO Wanzhi qiao College of Civil and Architecture Engineering Guangxi UniversityNanning 530005China School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China School of Civil and Environment Engineering Harbin Institute of TechnologyShenzhenShenzhen 518000Guangdong ProvinceChina

The present study focuses on an inextensible beam and its relevant inertia nonlinearity,which are essentially distinct from the commonly treated extensible beam that is dominated by the geometric ***,by considering a weakly constrained or free end(in the longitudinal direction),the inextensibility assumption and inertial nonlinearity(with and without an initial curvature)are *** a straight beam,a multi-scale analysis of hardening/softening dynamics reveals the effects of the end stiffness/*** the straight scenario,a refined inextensible curved beam model is further proposed,accounting for both its inertial nonlinearity and geometric nonlinearity induced by the initial *** numerical results for the frequency responses are also presented to illustrate the dynamic effects of the initial curvature and axial constraint,i.e.,the end mass and end stiffness.

关键词： inextensible beam inertia nonlinearity initial curvature geometric nonlinearity hardening/softening dynamics

Multi-Cluster Flocking Behavior Analysis for a Delayed Cucker-Smale Model with Short-Range Communication Weight

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2022年第1期35卷 137-158页

作者： qiao Zhengyang LIU Yicheng WANG Xiao Department of Mathematics National University of Defense TechnologyChangsha 410073China

This paper analyzes the multi-cluster flocking behavior of a Cucker-Smale model involving delays and a short-range communication *** each sub-flocking group,the velocity between agents is alignment and the position locates at a limited domain;but in different sub-flocking groups,the position between agents is *** constructing dissipative differential inequalities of subensembles together with Lyapunov functional methods,the authors provide the sufficient condition for the multi-cluster flocking *** sufficient condition includes the estimation of the range of coupling strength and the upper bound of time *** a result,the authors show that the coupling strength among agents and initial threshold value determine the multi-cluster flocking behavior of the delayed Cucker-Smale model.

关键词： Cucker-Smale model Lyapunov functional multi-cluster flocking short-range communication weight time-delay systems

Mean estimation over numeric data with personalized local differential privacy

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2022年第3期16卷 183-192页

作者： qiao XUE Youwen ZHU Jian WANG College of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China Guangxi Key Laboratory of Trusted Software Guilin University of Electronic TechnologyGuilin 541004China School of Cyber Security Gansu University of Political Science and LawLanzhou 730070China

The fast development of the Internet and mobile devices results in a crowdsensing business model,where individuals(users)are willing to contribute their data to help the institution(data collector)analyze and release useful ***,the reveal of personal data will bring huge privacy threats to users,which will impede the wide application of the crowdsensing *** settle the problem,the definition of local differential privacy(LDP)is ***,to respond to the varied privacy preference of users,resear-chers propose a new model,i.e.,personalized local differential privacy(PLDP),which allow users to specify their own privacy *** this paper,we focus on a basic task of calculating the mean value over a single numeric attribute with *** on the previous schemes for mean estimation under LDP,we employ PLDP model to design novel schemes(LAP,DCP,PWP)to provide personalized privacy for each *** then theoretically analysis the worst-case variance of three proposed schemes and conduct experiments on synthetic and real datasets to evaluate the performance of three *** theoretical and experimental results show the optimality of PWP in the low privacy regime and a slight advantage of DCP in the high privacy regime.

关键词： personalized local differential privacy mean estimation crowdsensing model

A silylene-stabilized distannavinylidene with a highly labile substituent

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第12期66卷 3555-3561页

作者： Zihao qiao Ming Chen Zhenbo Mo State Key Laboratory and Institute of Elemento-Organic Chemistry Frontiers Science Center for New Organic MatterCollege of ChemistryNankai UniversityTianjin 300071China

Vinylidene and its heavier analogues are fundamentally important in synthetic chemistry,but their stabilization and structural characterization remains extremely *** we describe that the reduction of an NHSi-stabilized stannyl-stannylene(2)with one molar equivalent of[(^(Mes)Nacnac)Mg]_(2)affords an NHSi-stabilized distannavinylidene(3).Single-crystal X-ray crystallography and density functional theory(DFT)calculations show that compound 3 features a pronounced Sn=Sn double bond and one lone pair of electrons at the two-coordinate Sn *** strikingly,3 undergoes an interconversion with distannyne(4)upon the addition and removal of one molar equivalent of N-heterocyclic *** 3 readily reacts with Ph_(2)C=C=O,Ad C≡P and(Al Cp^(*))_(4)to give the structurally interesting stannacycles(5,6)and an aluminyl distannyne(7),demonstrating its unique reactivity derived from the high substituent lability.

关键词： distannavinylidene silylenes stannacycles distannyne carboranes

Theoretical insights into influence of additives on sulfamethoxazole crystal growth kinetics and mechanisms

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2023年第10期17卷 1503-1515页

作者： qiao Chen Mingdong Zhang Yuanhui Ji Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing 211189China

In this work,the influence of the initial chemical potential gradient,stirring speed,and polymer type on sulfamethoxazole(SMX)crystal growth kinetics was systematically investigated through density functional theory(DFT)calculations,experimental measurements and the two-step chemical potential gradient *** investigate the influence of different conditions on the thermodynamic driving force of SMX crystal growth,SMX solubilities in different polymer solutions were *** model polymers effectively improved SMX *** was further found that polyvinylpyrrolidone(PVP)and hydroxypropyl methyl cellulose(HPMC)played a crucial role in inhibiting SMX crystal ***,polyethylene glycol(PEG)promoted SMX crystal *** effect of the polymer on the crystal growth mechanisms of SMX was further analyzed by the two-step chemical potential gradient *** the system containing PEG 6000,crystal growth is dominated by the surface ***,in the system containing PEG 20000,crystal growth is dominated by both the surface reaction and *** addition,DFT calculations results showed that HPMC and PVP could form strong and stable binding energies with SMX,indicating that PVP and HPMC had the potential ability to inhibit SMX crystal growth.

关键词： insoluble drugs polymer inhibition crystallization crystal growth kinetics DFT calculations

All-optically integrated photoacoustic and optical coherence tomography:A review

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2017年第4期10卷 42-51页

作者： Wei qiao Zhongjiang Chen Ministry of Education Key Laboratory of Laser Life Science and Institute of Laser Life Science College of Biophotonics South China Normal University Guangzhou 510631 China

All-optically integrated photoacoustic(PA)and optical coherence tomography(OCT)dualmode imaging technology that could o®er comprehensive pathological information for accurate diagnosis in clinic has gradually become a promising imaging technology in the aspect of biomedical imaging during the recent *** review refers to the technology aspects of alloptical PA detection and system evolution of optically integrated PA and OCT,including Michelson interferometer dual-mode imaging system,Fabry–Perot(FP)interferometer dualmode imaging system and Mach–Zehnder interferometer dual-mode imaging *** is believed that the optically integrated PA and OCT has great potential applications in biomedical imaging.

关键词： All-optical photoacoustic optical coherence tomography dual-mode imaging