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Biocompatible carbon nitride quantum dots nanozymes with high nitrogen vacancies enhance peroxidase-like activity for broadspectrum antibacterial

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Nano Research 2023年第5期16卷 7237-7247页

作者： Xiaohui Dai Huan Liu Wenxiao Du Jie Su Lingshuai Kong Shouqing ni Jinhua zhan Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China School of Environmental Science and Engineering Shandong UniversityJinan 250100China Institute of Eco-Environmental Forensics Shandong UniversityQingdao 266237China

Nanozyme antibacterial agents with high enzyme-like catalytic activity and strong bacteria-binding ability have provided an alternative method to efficiently disinfect drug-resistance ***,the carbon nitride quantum dots(CNQDs)nanozymes with high nitrogen vacancies(NVs)were mass-productively prepared by a simple ultrasonic-crushing method assisted by propylene *** was found that the NVs of CNQDs were stemmed from the selective breaking of surface N-(C)_(2)sites,accounting for 6.2%.Experiments and density functional theory(DFT)simulations have demonstrated that the presence of NVs can alter the local electron distribution and extend theπ-electron delocalization to enhance the peroxidase-like *** CNQDs could enter inside microorganisms by diffusion and elevate the bacteria-binding ability,which enhanced the accurate and rapid attack of·OH to the *** sterilization rate of CNQDs against Gram-negative bacteria(***),Gram-positive bacteria(***,***),fungi(***)reaches more than 99%.Thus,this work showed great potential for engineered nanozymes for broad-spectrum antibacterial in biomedicine and environmental protection.

关键词： carbon nitride quantum dots(CNQDs) nitrogen vacancies(NVs) peroxidase-like activity biocompatible broad-spectrum antibacterial

Cyber-attack Detection Strategy Based on Distribution System State Estimation

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Journal of Modern Power Systems and Clean Energy 2020年第4期8卷 669-678页

作者： Huan Long zhi Wu Chen Fang Wei Gu Xinchi Wei Huiyu zhan IEEE School of Electrical Engineering Southeast UniversityNanjingChina State Grid Shanghai Electric Power Company Electric Power Research InstituteShanghaiChina China Electric Power Research Institute BeijingChina

Cyber-attacks that tamper with measurement information threaten the security of state estimation for the current distribution *** paper proposes a cyber-attack detection strategy based on distribution system state estimation(DSSE).The uncertainty of the distribution network is represented by the interval of each state variable.A three-phase interval DSSE model is proposed to construct the interval of each state *** improved iterative algorithm(IIA)is developed to solve the interval DSSE model and to obtain the lower and upper bounds of the interval.A cyber-attack is detected when the value of the state variable estimated by the traditional DSSE is out of the corresponding interval determined by the interval *** validate the proposed cyber-attack detection strategy,the basic principle of the cyber-attack is studied,and its general model is *** proposed cyber-attack model and detection strategy are conducted on the IEEE 33-bus and 123-bus *** experiments of the proposed IIA,Monte Carlo simulation algorithm,and interval Gauss elimination algorithm prove the validation of the proposed method.

关键词： Cyber-attack detection distribution network interval state estimation distribution system state estimation cyber-attack model

Multilayer Antireflection Coating for Triple Junction Solar Cells

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Chinese Physics Letters 2011年第4期28卷 209-212页

作者： zhan Feng WANG Hai-Li HE Ji-Fang WANG Juan HUANG She-Song ni Hai-Qiao niU zhi-Chuan State Key Lab for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083

According to the theory of optical films,we simulate the reflectivity of antireflection coatings(ARCS)for solar cells of Gao.51no.5P/GaAs/Ge based on an optical transfer *** order to provide sufficient consideration of the refractive index dispersion effect of multilayer ARCS,we use multi-dimensional matrix data for reliable *** the reflection curves are obtained,the effective average reflectance Re is introduced to optimize the film system by minimizing *** of single layer(A1_(2)0_(3)),double layer(MgF_(2)/ZnS)and triple layer(MgF_(2)/A1_(2)0_(3)/ZnS)ARCS is realized by using this method for space and terrestrial *** of these ARCS are compared after *** theoretical parameters can be used to guide experiments.

关键词： Solar layer multilayer

Experimental study on ceramic balls impact composite armor

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Defence Technology（防务技术） 2020年第2期16卷 408-416页

作者： Wei-zhan Wang zhi-gang Chen Shun-shan Feng Tai-yong Zhao Underground Target Damage Technology National Defense Key Discipline Laboratory North University of ChinaTaiyuan 030051ShanxiChina State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology100081BeijingChina

Ceramic balls represent a new type of damaging element,and studies on their damaging power of composite armor are required for a comprehensive evaluation of the effectiveness of various types of *** goal of this study was to determine the impact ofφ7 mm toughened Al2 O3 ceramic balls on a composite ceramic/metal *** influences of the ceramic panel and the thickness of the metal backing material on the destroying power of the ceramic balls were first *** on the agreement between numerical simulation,experimental results,and calculation models of the target plate resistance,the response mechanism of the ceramic balls was further *** results indicate that for a back plate of Q235 steel,with an increasing thickness of the ceramic panel,the piercing speed limit of the ceramic balls gradually increases and the diameter of the out-going hole on the metal back *** conditions were tested to assess the effects on the piercing speed,the diameter of the out-going hole,the micro-element stress,and the integrity of the recovered ceramic bowl.

关键词： Impact Penetration Infinitesimal Interface collapse

Polymerization of Methyl Methacrylate with Samarocene Complex Supported on Mesoporous Silica

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Chinese Chemical Letters 2001年第9期12卷 821-822页

作者： Xu Feng ni zhi Quan SHEN Hajime YASUDA Institute of Polymer Science Zhejiang UniversityHangzhou 310027 Department of Applied Chemistry Faculty of EngineeringHiroshima UniversityHigashi-Hiroshima 724Japan

Samarocene complex was supported on a series of mesoporous silica with various pore sizes. Polymerization of methyl methacrylate (MMA) by these catalysts provide highly syndiotactic PMMAs with higher molecular weights... 详细信息

关键词： Mesoporous silica supported catalyst samarocene complex

Preparation of amphiphilic graft copolymer with polyisoprene backbone by combination of anionic polymerization and "click" reaction

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Chinese Chemical Letters 2012年第3期23卷 347-350页

作者： Fei Shao Xu Feng ni zhi Quan Shen MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

A novel graft copolymer consisting of polyisoprene backbone and hydrophilic side chain with carbamic acid ester functional group was prepared via thiol-ene＂click＂reaction and alcohol-isocyanate *** was synthesized by anionic polymerization using n-butyl lithium as initiator,and the pendant hydroxyl groups were introduced by the thiol-ene reaction of mercaptoethanol with the double bond of 1,2-addition units of PI backbone in the presence of radical initiator azobisisobutyronitrile. Isocyanate end group capped poly（ethylene glycol）（mPEG-NCO） was grafted onto the PI backbone through alcoholisocyanate reaction between the pendant hydroxyl groups and isocyanate group of *** structure of the graft copolymer were characterized and confirmed by means of size-exclusion chromatography,~1H NMR and FTIR spectroscopy.

关键词： Graft-copolymer Thiol-ene addition Isocyanate Click reaction

Precipitates in Steels With Ti Additive Produced by CSP Process

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Journal of Iron and Steel Research International 2009年第4期16卷 60-66页

作者： LOU Yan-zhi LIU De-lu ni Xiao-qing Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China

Hot strips of low carbon steels with Ti additive [-contain C 0.04 % -0. 07 % , Si≤0.6%, Mn≤0.6%, Ti 0. 060/00- 0.14% （mass percent）] prodvced by EAF-CSP （Electric Arc Furnaces-Compact Strip Production） process were examined by TEM, HREM and XRD. Carbonitrides with different N/C ratio were found in the sam- ples. The varying composition of the Ti-carbonitrides resulted from the supersaturation of Ti and temperature at which the compound was formed. In the tested steel, total mass fraction of the precipitates including cementite, carbonitride and a small quantity of Fe3O4, AO2O3 , Ti2 CS and A1N was about 0. 305 %. XRD results showed that about a quarter of the powder extracted by electrolysis was titanium nitrides, carbonitrides and carbides. Particle arrays formed by interphase precipitation could be observed either in slabs or in hot strips. The dominant reaction mecha- nisms were discussed. Compared with the conventional cold charge process, small amount of Ti addition would be more effective for orecipitation of fine orecioitates in the steels oroduced by CSP process.

关键词： compact strip production steel with Ti additive titanium carbonitride precipitation interphase precipitation

Mechanism of Janus Polymerization: A DFT StudyFig. S3 Energy profiles of anionic polymerization in Stage I under B3LYP/6-31G(d,p)(blue) and B3LYP/aug-cc-p VTZ//B3LYP/6-31G(d,p)(red). Scheme S1. Propagation process of CL/THF on cationic side in Stage I of J

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Chinese Journal of Polymer Science 2019年第10期37卷 990-994,I0004页

作者： Tian-Wen Bai Xu-Feng ni Jun Ling zhi-Quan Shen Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University

Janus polymerization is featured as a combination of cationic and anionic growing ends in one living polymer chain. In the copolymerization of THF and CL catalyzed by lutetium triflates and initiated by propylene oxide, three stages are identified by kinetic study including(1) fast cationic polymerization with slow anionic one,(2) fast anionic polymerization with dormant cationic one, and(3)reactivation of cationic polymerization with coupling of anionic and cationic chain ends. In this work, density functional theory(DFT)calculation is employed to investigate the reaction details of ionic polymerization and dormancy. A “tripedal crow” configuration is proposed to illustrate the unique high-coordinated ligand exchange configuration in anionic polymerization in different stages. The trigger of dormancy is determined as chain structures rather than concentration of triflate anion according to both calculation and experimental results.

关键词： Rare earth metal catalysts Ring-opening polymerization Ionic polymerization Reaction mechanism Quantum chemicalcomputation

Propagation of Few-Cycle Pulse Laser in Two-Level Atom Medium

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Chinese Physics Letters 2001年第7期18卷 912-914页

作者： XIAO Jian WANG Zhong-Yang XU zhi-zhan Laboratory for High Intensity Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800

By comparing the numerical solutions of Maxwell-Bloch equations beyond and within the slowly-varying envelope approximation and the rotating-wave approximation for the propagation of few-cycle pulse laser in a resonant two-level atom medium,we found that both the Rabi flopping and the refractive index,and subsequently the carrier and the propagation velocity of the few-cycle pulse,are closely connected with the time-derivative behaviour of the electric *** is because of the Rabi flopping is such that soliton pulse splits during propagation and that a shorter pulse propagates faster than a broader one.

关键词： approximation soliton faster