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High-Efficiency Photo-Induced Charge Transfer for SERS Sensing in N-Doped 3D-Graphene on Si Heterojunction

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Energy & Environmental materials 2024年第2期7卷 268-276页

作者： Guanglin Zhang Jie Sun Genwang Wei Shan Zhang Zhengyi He Huijuan Wu Bingkun Wang Siwei Yang Guqiao Ding Zhiduo Liu Zhiwen Jin Caichao Ye Gang Wang Department of Microelectronic science and Engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China Department of Biochemistry and Molecular Biology School of Basic Medical SciencesShenzhen UniversityShenzhen 518071China Academy for Advanced Interdisciplinary Studies&Department of materials science and Engineering Guangdong Provincial Key Laboratory of Computational Science and Material DesignSouthern University of Science and TechnologyShenzhen 518055China State key laboratory of Functional materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Physical science and Technology&key laboratory for Magnetism and Magnetic materials of the Ministry of Education Lanzhou UniversityLanzhou 730000China

Nitrogen-doped three-dimensional graphene(N-doped 3D-graphene)is a graphene derivative with excellent adsorption capacity,large specific surface area,high porosity,and optoelectronic ***,N-doped 3D-graphene/Si heterojunctions were grown in situ directly on silicon(Si)substrates via plasma-assisted chemical vapor deposition(PACVD),which is promising for surface-enhanced Raman scattering(SERS)substrates *** analyses of theoretical simulation,incorporating N atoms in 3D-graphene are beneficial to increase the electronic state density of the system and enhance the charge transfer between the substrate and the target *** enhancement of the optical and electric fields benefits from the stronger light-matter interaction improved by the natural nano-resonator structure of N-doped *** as-prepared SERS substrates based on N-doped 3D-graphene/Si heterojunctions achieve ultra-low detection for various molecules:10^(-8)M for methylene blue(MB)and 10^(-9)M for crystal violet(CRV)with rhodamine(R6G)of 10^(10)*** practical detected,10^(-8)M thiram was precisely detected in apple peel *** results indicate that N-doped 3D-graphene/Si heterojunctions based-SERS substrates have promising applications in low-concentration molecular detection and food safety.

关键词： charge transfer DFT simulation N-doped 3D-graphene SERS Thiram detection

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Control of temperature dependent viscosity for manufacturing of Bi-doped active fiber

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international Journal of Extreme Manufacturing 2024年第3期6卷 522-530页

作者： Rui Duan Jingfei Chen Hao Ke Tianxia Wei Ke Zhang Xueliang Li Xu Feng Qiuju Zheng Zhixue He Jianrong Qiu Shifeng Zhou State key laboratory of Luminescent materials and Devices School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640People’s Republic of China guangdong provincial key laboratory of Fiber Laser materials and Applied Techniques Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangzhou 510640People’s Republic of China School of materials science and Engineering Qilu University of TechnologyJinanPeople’s Republic of China Peng Cheng laboratory Shenzhen 518000People’s Republic of China College of Optical science and Engineering State Key Laboratory of Modern Optical InstrumentationZhejiang UniversityHangzhou 310027People’s Republic of China

Bi-activated photonic materials are promising for various applications in high-capacity telecommunication,tunable laser,and advanced bioimaging and *** various Bi-doped material candidates have been explored,manufacturing of Bi heavily doped fiber with excellent optical activity remains a long-standing ***,a novel viscosity evolutional behavior mediated strategy for manufacturing of Bi-doped active fiber with high dopant solubility is *** intrinsic relation among the evolution of Bi,reaction temperature and viscosity of the glass system is ***,the effective avenue to prevent the undesired deactivation of Bi during fiber drawing by tuning the temperature dependent viscosity evolution is *** applying the strategy,for the first time we demonstrate the success in fabrication of heavily doped Bi active ***,the principal fiber amplifier device is constructed and broadband optical signal amplification is *** findings indicate the effectiveness of the proposed temperature dependent viscosity mediated strategy for developing novel photonic active fiber,and they also demonstrate the great potential for application in the next-generation high-capacity telecommunication system.

关键词： infrared luminescence active fiber optical amplification

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A Local Deep Learning Method for Solving High Order Partial Differential Equations

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Numerical mathematics(Theory,Methods and Applications) 2022年第1期15卷 42-67页

作者： Jiang Yang Quanhui Zhu international center of mathematics Southern University of Science and TechnologyShenzhen 518055China Department of mathematics Southern University of Science and TechnologyShenzhen 518055China guangdong provincial key laboratory of computational science and material design Southern University of Science and TechnologyShenzhen 518055China

At present, deep learning based methods are being employed to resolvethe computational challenges of high-dimensional partial differential equations(PDEs). But the computation of the high order derivatives of neural networks iscostly, and high order derivatives lack robustness for training purposes. We proposea novel approach to solving PDEs with high order derivatives by simultaneously approximating the function value and derivatives. We introduce intermediate variablesto rewrite the PDEs into a system of low order differential equations as what is donein the local discontinuous Galerkin method. The intermediate variables and the solutions to the PDEs are simultaneously approximated by a multi-output deep neuralnetwork. By taking the residual of the system as a loss function, we can optimizethe network parameters to approximate the solution. The whole process relies onlow order derivatives. Numerous numerical examples are carried out to demonstrate that our local deep learning is efficient, robust, flexible, and is particularlywell-suited for high-dimensional PDEs with high order derivatives.

关键词： Deep learning deep neural network high order PDEs reduction of order deep Galerkin method

Symmetry-Assisted Protection and Compensation of Hidden Spin Polarization in Centrosymmetric Systems

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Chinese Physics Letters 2020年第8期37卷 94-100页

作者： Yingjie Zhang Pengfei Liu Hongyi Sun Shixuan Zhao Hu Xu Qihang liu shenzhen Institute for Quantum science and Technology and Department of Physics Southern University of Science and TechnologyShenzhen 518055China guangdong provincial key laboratory for computational science and material design Southern University of Science and TechnologyShenzhen 518055China center for Quantum Computing Peng Cheng LaboratoryShenzhen 518055China

It was recently noted that in certain nonmagnetic centrosymmetric compounds,spin–orbit interactions couple each local sector that lacks inversion symmetry,leading to visible spin polarization effects in the real space,dubbed“hidden spin polarization(HSP)”.However,observable spin polarization of a given local sector suffers interference from its inversion partner,impeding material realization and potential applications of *** from a single-orbital tight-binding model,we propose a nontrivial way to obtain strong sector-projected spin texture through the vanishing hybridization between inversion partners protected by nonsymmorphic *** HSP effect is generally compensated by inversion partners near the Г point but immune from the hopping effect around the boundary of the Brillouin *** further summarize 17 layer groups that support such symmetry-assisted HSP and identify hundreds of quasi-2D materials from the existing databases by first-principle calculations,among which a group of rare-earth compounds LnIO(Ln=Pr,Nd,Ho,Tm,and Lu)serves as great candidates showing strong Rashba-and Dresselhaus-type *** findings expand the material pool for potential spintronic applications and shed light on controlling HSP properties for emergent quantum phenomena.

关键词： symmetry Polarization hundreds

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A Well-Balanced Partial Relaxation Scheme for the Two-Dimensional Saint-Venant System

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Communications in computational Physics 2023年第5期33卷 1432-1465页

作者： Xi Chen Alexander Kurganov Department ofmathematics Harbin Institute of TechnologyHarbin150001China and Department of MathematicsSouthern University of Science and TechnologyShenzhen518055China Department of mathematics SUSTech International Center for Mathematics and Guangdong Provincial Key Laboratory of Computational Science and Material DesignSouthern University of Science and TechnologyShenzhen518055China

We develop a new moving-water equilibria preserving partial relaxation(PR)scheme for the two-dimensional(2-D)Saint-Venant systemof shallowwater *** new scheme is a 2-D generalization of the one-dimensional(1-D)PR scheme recently proposed in[***,***,***,***,***,***.,42(2020),pp.A2206–A2229].Our scheme is based on the PR approximation,which is designed in two ***,the geometric source terms are incorporated into the discharge fluxes,which results in a hyperbolic system with global ***,the discharge equations are relaxed so that the nonlinearity is moved into the stiff right-hand side of the four added auxiliary *** obtained PR system is then numerically integrated using a semi-discrete hybrid upwind/central-upwind finitevolume method combined with an efficient semi-implicit ODE *** new 2-D PR scheme inherits the main advantages of the 1-D PR scheme:(i)no special treatment of the geometric source terms is required,(ii)no nonlinear(cubic)equations should be solved to obtain the point values of the water depth out of the reconstructed *** performance of the proposed PR scheme is illustrated on a number of numerical examples,in which we demonstrate that the PR scheme not only capable of exactly preserving quasi 1-D moving-water steady states and accurately capturing their small perturbations,but can also handle genuinely 2-D steady states and their small perturbations in a non-oscillatory manner.

关键词： Saint-Venant system of shallow water equations partial relaxation scheme wellbalanced method steady-state solutions(equilibria) moving-water and still-water equilibria

Schur Complement Based Preconditioners for Twofold and Block Tridiagonal Saddle Point Problems

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Communications in Mathematical Research 2024年第2期40卷 214-244页

作者： Mingchao Cai Guoliang Ju Jingzhi Li Department of mathematics Morgan State UniversityBaltimoreMD 21251USA. Solid State R&D Department Shenzhen Tenfong Co.Ltd.Shenzhen 518055P.R.China. Department of mathematics Southern University of Science and TechnologyShenzhen 518055P.R.China.

In this paper,we consider using Schur complements to design preconditioners for twofold and block tridiagonal saddle point *** type of the preconditioners are based on the nested(or recursive)Schur complement,the other is based on an additive type Schur complement after permuting the original saddle point *** analyze different preconditioners incorporating the exact Schur *** show that some of them will lead to positively stable preconditioned systems if proper signs are selected in front of the Schur *** positive-stable preconditioners outperform other preconditioners if the Schur complements are further approximated *** experiments for a 3-field formulation of the Biot model are provided to verify our predictions.

关键词： Schur complement block tridiagonal systems positively stable preconditioners Routh-Hurwitz stability criterion.

A Decreasing Upper Bound of the Energy for Time-Fractional Phase-Field Equations

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Communications in computational Physics 2023年第4期33卷 962-991页

作者： Chaoyu Quan Tao Tang Boyi Wang Jiang Yang international center for mathematics Southern University of Science and TechnologyShenzhen 518055China Division of science and Technology BNU-HKBU United International CollegeZhuhai 519087China guangdong provincial key laboratory of Interdisciplinary Research and Application for Data science BNU-HKBU United International CollegeZhuhai 519087China Department of mathematics Southern University of Science and TechnologyShenzhen 518055GuangdongChina Department of mathematics National University of SingaporeSingapore 119076Singapore guangdong provincial key laboratory of computational science and material design Southern University of Science and TechnologyShenzhen 518055China

In this article,we study the energy dissipation property of time-fractional Allen–Cahn *** the continuous level,we propose an upper bound of energy that decreases with respect to time and coincides with the original energy at t=0 and as t tends to∞.This upper bound can also be viewed as a nonlocal-in-time modified energy which is the summation of the original energy and an accumulation term due to the memory effect of time-fractional *** particular,the decrease of the modified energy indicates that the original energy indeed decays *** in a small neighborhood at t=*** illustrate the theory mainly with the time-fractional Allen-Cahn equation but it could also be applied to other time-fractional phase-field models such as the Cahn-Hilliard *** the discrete level,the decreasing upper bound of energy is useful for proving energy dissipation of numerical ***-order L1 and second-order L2 schemes for the time-fractional Allen-Cahn equation have similar decreasing modified energies,so that stability can be *** numerical results are provided to illustrate the behavior of this modified energy and to verify our theoretical results.

关键词： Time-fractional Allen-Cahn equation energy dissipation L1 approximation L2 approximation

Fifth-Order A-WENO Schemes Based on the Adaptive Diffusion Central-Upwind Rankine-Hugoniot Fluxes

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Communications on Applied mathematics and Computation 2023年第1期5卷 295-314页

作者： Bao-Shan Wang Wai Sun Don Alexander Kurganov Yongle Liu School of Mathematical sciences Ocean University of ChinaQingdao 266100ShandongChina Department of mathematics SUSTech International Center for Mathematics and Guangdong Provincial Key Laboratory of Computational Science and Material DesignSouthern University of Science and TechnologyShenzhen 518055GuangdongChina Department of mathematics Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Department of mathematics Southern University of Science and TechnologyShenzhen 518055GuangdongChina

We construct new fifth-order alternative WENO(A-WENO)schemes for the Euler equations of gas *** new scheme is based on a new adaptive diffusion centralupwind Rankine-Hugoniot(CURH)numerical *** CURH numerical fluxes have been recently proposed in[Garg et al.J Comput Phys 428,2021]in the context of secondorder semi-discrete finite-volume *** proposed adaptive diffusion CURH flux contains a smaller amount of numerical dissipation compared with the adaptive diffusion central numerical flux,which was also developed with the help of the discrete RankineHugoniot conditions and used in the fifth-order A-WENO scheme recently introduced in[Wang et *** J Sci Comput 42,2020].As in that work,we here use the fifth-order characteristic-wise WENO-Z interpolations to evaluate the fifth-order point values required by the numerical *** resulting one-and two-dimensional schemes are tested on a number of numerical examples,which clearly demonstrate that the new schemes outperform the existing fifth-order A-WENO schemes without compromising the robustness.

关键词： A-WENO schemes Central-upwind schemes Discrete Rankine-Hugoniot conditions Numerical dissipation switch Local speeds of propagation Euler equations of gas dynamics

Fifth-Order A-WENO Path-Conservative Central-Upwind Scheme for Behavioral Non-Equilibrium Traffic Models

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Communications in computational Physics 2023年第3期33卷 692-732页

作者： Shaoshuai Chu Alexander Kurganov Saeed Mohammadian Zuduo Zheng Department of mathematics Southern University of Science and TechnologyShenzhen518055P.R.China shenzhen international center for mathematics and guangdong provincial key laboratory of computational science and material design Southern University of Science and TechnologyShenzhen518055P.R.China School of Civil Engineering the University of QueenslandBrisbane Qld4072Australia.

Non-equilibrium hyperbolic traffic models can be derived as continuum approximations of car-following models and in many cases the resulting continuum models are *** leads to numerical difficulties,which seem to have discouraged further development of complex behavioral continuum models,which is a significant research *** this paper,we develop a robust numerical scheme that solves hyperbolic traffic flow models based on their non-conservative *** develop a fifth-order alternative weighted essentially non-oscillatory(A-WENO)finite-difference scheme based on the path-conservative central-upwind(PCCU)method for several non-equilibrium traffic flow *** order to treat the non-conservative product terms,we use a path-conservative *** this end,we first apply the recently proposed secondorder finite-volume PCCU scheme to the traffic flow models,and then extend this scheme to the fifth-order of accuracy via the finite-difference A-WENO *** designed schemes are applied to three different traffic flow models and tested on a number of challenging numerical *** schemes produce quite accurate results though the resolution achieved by the fifth-order A-WENO scheme is *** proposed scheme in this paper sets the stage for developing more robust and complex continuum traffic flow models with respect to human psychological factors.

关键词： Finite-difference A-WENO schemes finite-volume central-upwind schemes pathconservative central-upwind schemes non-oscillatory schemes continuum traffic flow model driver behavior.