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Dynamical Suppression of Nonlocal Decoherence in Two-State Quantum Systems

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Communications in Theoretical Physics 2009年第11期52卷 832-834页

作者： WANG Zhong-Jie zhang kan Department of Physics Anhui Normal University Wuhu 241000 China

Nonlocal decoherence of two qubits due to pure phase damping has been *** have proposeda scheme to keep the entanglement of two qubits from nonlocal *** applying a series of±π pulses,nonlocaldecoherence can be thoro... 详细信息

关键词： entanglement quantum bits dynamical suppression

Stability of Time-delay System with Time-varying Uncertainties via Homogeneous Polynomial Lyapunov-Krasovskii Functions

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International Journal of Automation and computing 2015年第6期12卷 657-663页

作者： Guo-Chen Pang kan-Jian zhang Key Laboratory of Measurement and Control of CSE Ministry of Education School of Automation Southeast University

This paper deals with the robust stability of time-delay system with time-varying uncertainties via homogeneous polynomial Lyapunov-Krasovskii functions(HPLKF). We give a sufficient condition to demonstrate that the system is asymptotically stable.A new class of Lyapunov-Krasovskii function is introduced, whose main feature is that the conservativeness due to uncertainties is reduced. Numerical examples illustrate the effectiveness of our method.

关键词： Asymptotically stable time-delay uncertainties lin

Mono-dispersed Ag nanoparticles decorated graphitic carbon nitride:An excellent lubricating additive as PPESK composite film

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Friction 2022年第5期10卷 717-731页

作者： Beibei CHEN Mengjie zhang kan zhang Zhe DONG Jiaye LI Gai ZHAO School of Materials and Science Engineering Institute for Advanced MaterialsJiangsu UniversityZhenjiang 212013China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Studies show that two dimensional(2D)nanomaterial and its hybrid have a great promise in tribology for the special laminar ***,the majority of performed investigations about 2D graphitic carbon nitride(g-C_(3)N_(4))nanosheets are most focused on energy storage,catalysis,adsorption,rarely *** the present study,g-C_(3)N_(4) supporting mono-dispersed Ag nanoparticle hybrid(g-C_(3)N_(4)/Ag)is prepared,and its microstructure and chemical composition are *** specifically,the tribological performance as the lubricating additive of poly phthalazinone ether sulfone ketone(PPESK)composite is investigated using the ball-on-disc friction ***,the corresponding enhancement mechanism is well proposed based on the experimental analysis and theoretical *** results show that Ag nanoparticles with a size of about 10-20 nm are homogeneously anchored on g-C_(3)N_(4) nanosheets,favoring for good compatibility between g-C_(3)N_(4)/Ag and *** is found that when 0.3 wt%of g-C_(3)N_(4)/Ag is added to PPESK,the friction coefficient and wear rate of PPESK decrease by 68.9%and 97.1%,*** reductions are mainly attributed to the synergistic self-lubricating effect of Ag nanoparticles and g-C_(3)N_(4) nanosheet,the formation of transfer film,as well as the limited effect of g-C_(3)N_(4)/Ag on the shear deformation of PPESK composite ***,it is found that the proposed g-C_(3)N_(4)/Ag-PPESK composite still keeps reasonable friction-reducing and wear-resistant properties under heavy loads and high rotating *** present study demonstrates that the proposed g-C_(3)N_(4)/Ag hybrid is an excellent lubricating additive for polymer composites.

关键词： g-C_(3)N_(4)/Ag hybrid poly phthalazine ether sulfone ketone(PPESK)composite film friction wear theoretical simulation

Electrolysis of Direct Seawater: Challenges,Strategies,and Future Prospects

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Chinese Journal of Chemistry 2023年第23期41卷 3484-3492页

作者： Lin Hu Xiao Tan Xuhao Yang kan zhang School of Chemistry and Environmental Engineering Yancheng Teachers UniversityYanchengJiangsu224051 China MIIT Key Laboratory of Advanced Display Material and Devices College of Materials Science and EngineeringNanjing University of Science and TechnologyNanjingJiangsu210094 China

The use of renewable sources such as solar,ocean,geothermal,and wind energy to drive water electrolysis reactions to obtain green and clean hydrogen fuels is one of the important paths to achieve sustainable energy *** present,most water electrolysis technologies need to conduct corresponding pre-processing,such as diluting water sources and purifying dehydration,which will greatly increase operating *** development of direct seawater electrolytic process can effectively solve the above ***,we review the latest progress of the electrode materials and catalysts of the direct electrolysis process of seawater,and discuss how to design high activity and high-selective electrode materials for water electrolysis with familiar impurities (such as chloride,metal ions and biological organisms) existing in the future.

关键词： Electrocatalysis Water splitting Catalytic activity Oxygen evolution reaction Hydrogen evolution reaction

LAMINAR DEVELOPING FLOW IN THE ENTRANCE REGION OF ROTATING CURVED PIPES

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Journal of Hydrodynamics 2006年第4期18卷 418-423页

作者： MA Jian-feng SHEN Xin-rong zhang Ming-kan zhang Ben-Zhao Department of Mechanics Zhejiang University Hangzhou 310027 China

Three-dimensional laminar flow in the entrance region of rotating curved pipes was investigated. The governing equations were written in an orthogonal curvilinear coordinate system and solved with a fully three-dimensional numerical method. The development of secondary flow, axial velocity, local and average friction factors for different cases of rotation were given and discussed in detail. The results show that rotation influences the flow structure and friction factor greatly and that the secondary flow is sink-type in the early stage of development and then turns to vortex structure. The average friction factor and the intensity of secondary flow have drastic decrease near the entrance. At some proper rotation, the average friction factor can be noticeably reduced.

关键词： developing flow secondary flow rotating curved pipe

Boosting bulk charge transport of CuWO_(4) photoanodes via Cs doping for solar water oxidation

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Chinese Journal of Structural Chemistry 2024年第2期43卷 31-37页

作者： Xinyi Fan Xiaojia Yuan kan zhang School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China

Copper tungstate(CuWO_(4))is a promising photoanode for photoelectrochemical(PEC)water splitting due to its appropriate energy band position and broad light absorption ***,the inherent unfilled 3d atomic orbital of Cu acts as a natural electron-hole recombination site,significantly constraining the PEC performance of CuWO_(4).Herein,Cs atoms with complete atomic orbitals are doped into CuWO_(4)in order to obtain better bulk charge separation *** a result,the photocurrent of Cs@CuWO_(4)increases from 0.57 to 0.99 mA cm^(-2)compared to CuWO_(4)at 1.23 V *** hydrogen electrode(RHE)under AM 1.5G illumination,as well as the bulk charge transfer efficiencies rising from 13.5%to 19.3%.In addition,density of states(DOS)calculations further prove that the introduction of Cs atoms effectively suppresses the contribution of Cu 3d orbitals at the Fermi *** work offers a valuable reference for the advancement of CuWO_(4)as the next-generation PEC photoanode material.

关键词： Photoanode Water splitting Photoelectrochemical Charge separation

Toeplitz Operators with BMO Symbols on the Weighted Bergman Space of the Unit Ball

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Acta Mathematica Sinica,English Series 2011年第11期27卷 2129-2142页

作者： kan zhang Chao Mei LIU Yu Feng LU School of Mathematical Sciences Dalian University of Technology Dalian 116024 P. R. China College of Sciences Shenyang Agricultural University Shenyang 110161 P. R. China School of Science Dalian Jiaotong University Dalian 116028 P. R. China

In this paper we prove that the boundedness and compactness of Toeplitz operator with a BMOα1 symbol on the weighted Bergman space Aα2（Bn） of the unit ball is completely determined by the behavior of its Berezin t... 详细信息

关键词： Toeplitz operator BMO Berezin transform

Graphene oxide as a hole extraction layer loaded on BiVO_(4)photoanode for highly efficient photoelectrochemical water splitting

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Rare Metals 2022年第11期41卷 3795-3802页

作者： Min-Li Guo Shi-Peng Wan Cao-Long Li kan zhang Key Laboratory of Biomedical Functional Materials School of ScienceChina Pharmaceutical UniversityNanjing211198China Institute of Optoelectronics and Nanomaterials MIIT Key Laboratory of Advanced Display Material and DevicesCollege of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China

The tailor-made oxygen evolution catalysts(OECs)paired with photoanodes offer a path to promote water oxidation kinetics;however,the unsatisfied interface between OECs and photoanode sets a barrier for efficient charge ***,a graphene oxide(GO)layer to promote the charge transfer from BiVO_(4)(BVO)to NiOOH OEC is *** is found that GO layer inserted between BVO and NiOOH can not only serve as hole extraction layer due to its hole storage capability,but also improve the ***,the rationally designed NiOOH/GO/BVO photoanode achieves a photocurrent density of 3.81 mA·cm^(-2)at 1.23 V(*** hydrogen electrode(RHE)),which is 3.85 times as high as that of bare *** work opens up low-cost auxiliary materials for enhancing photoelectrochemical water splitting.

关键词： BiVO_(4) Water splitting Charge extraction Oxygen evolution catalyst Graphene oxide

Catalytic oxidation of low concentration formaldehyde over Pt/TiO_(2) catalyst

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Chinese Journal of Chemical Engineering 2021年第1期34卷 190-195页

作者： Yuan Su Keming Ji Jiayao Xun kan zhang Ping Liu Liang Zhao State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China

Formaldehyde(HCHO) is an important indoor *** oxidize low concentration HCHO is an effective way to eliminate indoor *** this study,a series of Pt/TiO_(2) catalysts are prepared by impregnation and reduced by NaBH_*** effects of loading amount of Pt and cry stal type of TiO_(2) on the physical and chemical properties and the catalytic performance in HCHO oxidation reaction are *** results show that the quantity of active site and the oxygen vacancy of catalysts increa sed with increasing Pt content,which is beneficial to promote the further performance of ***,with the further rises of Pt content,the specific surface area further decreases,and the proportion of Pt^(2+) species on the catalyst surface which is significant to catalytic properties also decreases,causing catalytic performance *** with the catalyst supporting on rutile,the Pt/α-TiO_(2) catalyst supporting on anatase has larger specific surface area,more Pt^(2+) phase and easier to form oxygen vacancy in the support,which cause better catalytic *** catalyst with Pt content of0.1 wt% and supported by anatase TiO_(2) has the best catalytic *** HCHO conversion efficiency reaches 98% and 100% at 50℃ and 100 ℃, and the stabilization time is longer than 140 h.

关键词： Catalyst support Catalysis Fixed-bed Pt/TiO_(2)