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ZnO/CeO_(2)/carbon xerogel composites with direct Z-scheme heterojunctions:Enhancing photocatalytic remediation of 4-chlorophenol under visible light

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Journal of Rare Earths 2024年第2期42卷 314-322,I0003页

作者： Nicolas Perciani de Moraes Maite Birkett de Campos Sanmartin Robson da Silva Rocha Abner de Siervo Marcos Roberto de Vasconcelos Lanza D.Amaranatha Reddy Lianqing Yu Liana Alvares Rodrigues escola de engenharia de lorena-EEL/USP Estrada Municipal do Campinho S/NCEP 12602-810LorenaSao PauloBrazil Institute of Physics"Gleb Wataghin" Applied Physics DepartmentState University of Campinas13083-859CampinasSPBrazi Instituto de Quimica de Sao Carlos Universidade de Sao PauloAv.Trab.Sao Carlense400-Parque Arnold SchimidtSao CarlosSP13566-590Spain department of Sciences Indian Institute of Information Technology Design and ManufacturingKurnoolAndhra Pradesh518007India School of Materials Science and Engineering China University of PetroleumQingdao266580China

This paper aims to create visible light driven ternary photocatalysts using zinc oxide(ZnO),cerium(IV)oxide(CeO_(2)),and carbon xerogel(CX) as constituent *** use of CeO_(2) is based on the creation of direct-Z-scheme heterojunctions with the ZnO and the consequent diminishing of charge recombination,whereas the carbon xerogel inclusion is predicted to minimize bandgap energy,decrease electro n-hole reco mbination,and boost specific surface *** re,the choice of the black-wattle tannin as a carbonaceous precursor was targeted at the development of an environmentally friendly and affordable *** existence of the hexagonal phase of zinc oxide and cubic structure of the cerium(IV) oxide in the ternary material was confirmed by X-ray diffractometry and X-ray photoelectron spectroscopy,with the latter also suggesting chemical bonding between the ZnO and the CX due to the creation of zinc oxycarbide *** inclusion of the carbon xerogel provokes a significant modification in the morphology of the ternary material,resulting in an increased surface area and smaller particle *** CX/ZnO-CeO_(2) ternary composite obtains the highest photocatalytic efficiency among all the materials studied,degrading 100% of 4-chlorophenol under simulated sunlight and 68% under visible radiation,after 5 *** increased photocatalytic activity can be attributed to the formation of direct Z-scheme heterojunctions between the semiconductors,higher visible light response,and higher specific surface area,as evidenced by the results obtained by active radical scavenging,chronoamperometry,diffuse reflectance spectroscopy,and N_(2) adsorption-desorption isotherms.

关键词： Zinc oxide Cerium(Ⅳ)oxide Carbon xerogel Photocatalysis Direct Z-scheme heterojunction 4-Chlorophenol Rare earths

detecting secondary spin with extreme mass ratio inspirals in scalar-tensor theory

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Chinese Physics C 2024年第9期48卷 210-224页

作者： Hong Guo Chao Zhang Yunqi Liu Rui-Hong Yue Yun-Gui Gong Bin Wang Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China escola de engenharia de lorena Universidade de São PauloLorenaSP 12602-810Brazil Shanghai Frontier Research Center for Gravitational Wave detection Shanghai Jiao Tong UniversitySha nghai 200240 China 4 School of Aeronautics and AstronauticsShanghai Jiao Tong UniversityShanghai 200240China School of Physics Huazhong University of Science and TechnologyWuhan 430074China department of Physics School of Physical Science and TechnologyNingbo UniversityNingbo 315211China

In this study,we investigate the detectability of the secondary spin in an extreme mass ratio inspiral(EMRI) system within a modified gravity model coupled with a scalar *** central black hole,which reduces to a Kerr one,is circularly spiralled by a scalar-charged spinning secondary body on the equatorial *** analysis reveals that the presence of the scalar field amplifies the secondary spin effect,allowing for a lower limit of the detectability and an improved resolution of the secondary spin when the scalar charge is sufficiently *** findings suggest that secondary spin detection is more feasible when the primary mass is not large,and TianQin is the optimal choice for detection.

关键词： Gravitational wave EMRI secondary spin scalar radiation

Quasinormal Modes of the Planar Black Holes of a Particular Lovelock Theory

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Communications in Theoretical Physics 2018年第12期69卷 689-694页

作者： Dan Wen Kai Lin Wei-Liang Qian Faculdade de engenharia de Guaratingueta Universidade Estadual Paulista Hubei Subsurface Multi-Scale Imaging Key Laboratory Institute of Geophysics and GeoinformaticsChina University of Geosciences escola de engenharia de lorena Universidade de Sao Paulo

In this work, we study the scalar quasinormal modes of a planar black hole metric in asymptotic anti-de Sitter spacetime derived from a particular Lovelock theory. The quasinormal frequencies are evaluated by adopting the Horowitz-Hubeny method as well as a matrix formalism. Also, the temporal evolution of small perturbations is studied by using finite difference method. The roles of the dimension of the spacetime, the parameter of the metric k, as well as the temperature of the background black hole, are discussed. It is observed that the particular form of the metric leads to quasinormal frequencies whose real parts are numerically insignificant. The black hole metric is found to be stable against small scalar perturbations.

关键词： quasinormal modes Lovelock theory Horowitz-Hubeny method matrix method

Shadows of magnetically charged rotating black holes surrounded by quintessence

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Chinese Physics C 2022年第6期46卷 246-256页

作者： Chengxiang Sun Yunqi Liu Wei-Liang Qian Ruihong Yue Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China escola de engenharia de lorena Universidade de Sao Paulo12602-810LorenaSPBrazil School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China Faculdade de engenharia de Guaratingueta Universidade Estadual Paulista12516-410GuaratingueiaSPBrazil

In this work,we study the optical properties of a class of magnetically charged rotating black hole *** black holes in question are assumed to be immersed in the quintessence field,and subsequently,the resulting black hole shadows are expected to be modified by the presence of dark *** investigate the photon region and the black hole shadow,especially their dependence on the relevant physical conditions,such as the quintessence state parameter,angular momentum,and magnetic charge *** photon regions depend sensitively on the horizon structure and possess intricate ***,from the viewpoint of a static observer,we explore a few observables,especially those associated with the distortion of the observed black hole shadows.

关键词： black hole shadow quintessence magnetically charged rotating black hole

A derivation of the Entropy-Based Relativistic Smoothed Particle Hydrodynamics by Variational Principle

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Communications in Theoretical Physics 2017年第9期67卷 382-386页

作者： Philipe Mota Wei-Xian Chen Wei-Liang Qian Centro Brasileiro de Pesquisas Fisicas R J Brazil escola de engenharia de lorena Universidade de Sgo Paulo SP Brazil Instituto de Ffsica e Qufmica Universidade Estadual Paulista Jdlio de Mesquita Filho SP Brazil

In this work, a second order smoothed particle hydrodynamics is derived for the study of relativistic heavy ion collisions. The hydrodynamical equation of motion is formulated in terms of the variational principle. In order to describe the fluid of high energy density but of low baryon density, the entropy is taken as the base quantity for the interpolation. The smoothed particle hydrodynamics algorithm employed in this study is of the second order, which guarantees better particle consistency. Furthermore, it is shown that the variational principle preserves the translational invariance of the system, and therefore improves the accuracy of the method. A brief discussion on the potential implications of the model in heavy ion physics as well as in general relativity are also presented.

关键词： hydrodynamics SPH method variational principle

The matrix method for black hole quasinormal modes

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Chinese Physics C 2019年第3期43卷 117-125页

作者： Kai Lin Wei-Liang Qian Hubei Subsurface Multi-scale Imaging Key Lab. Institute of Geophysics and GeomaticsChina University of GeosciencesHubei 430074China escola de engenharia de lorena Universidade de S?o Paulo12602-810LorenaSPBrazil Faculdade de engenharia de Guaratinguetá Universidade Estadual Paulista12516-410GuaratinguetáSPBrazil School of Physical Science and Technology Yangzhou UniversityJiangsu 225002China

We provide a comprehensive survey of possible applications of the matrix method for black hole quasinormal modes. The proposed algorithm can generally be applied to various background metrics, and in particular, it accommodates both analytic and numerical forms of the tortoise coordinates, as well as black hole spacetimes. We give a detailed account of different types of black hole metrics, master equations, and the corresponding boundary conditions. Besides, we argue that the method can readily be applied to cases where the master equation is a system of coupled equations. By adjusting the number of interpolation points, the present method provides a desirable degree of precision, in reasonable balance with its efficiency. The method is flexible and can easily be adopted to various distinct physical scenarios.

关键词： quasinormal modes black hole spacetime matrix method quasinormal frequency

Scalar and Dirac quasinormal modes of scalar-tensor-Gauss-Bonnet black holes

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Chinese Physics C 2022年第4期46卷 156-163页

作者： Tong-Zheng Wang Wei-Liang Qian Juan Fernando Zapata Zapata Kai Lin Hubei Subsurface Multi-scale Imaging Key Laboratory Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China escola de engenharia de lorena Universidade de São Paulo12602-810LorenaSPBrazil Faculdade de engenharia de Guaratinguetá Universidade Estadual Paulista12516-410GuaratinguetáSPBrazil Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

This study explores the scalar and Dirac quasinormal modes pertaining to a class of black hole solutions in the scalar-tensor-Gauss-Bonnet *** black hole metrics in question are novel analytic solutions recently derived in the extended version of the theory,which effectively follows at the level of the action of string *** to the existence of a nonlinear electromagnetic field,the black hole solution possesses a nonvanishing magnetic *** particular,the metric is capable of describing black holes with distinct characteristics by assuming different values of the ADM mass and the magnetic *** study investigates the scalar and Dirac perturbations in these black hole spacetimes;in particular,we focus on two different types of solutions,based on distinct horizon *** properties of the complex frequencies of the obtained dissipative oscillations are investigated,and the stability of the metric is subsequently *** also elaborate on the possible implications of this study.

关键词： quasinormal modes scalar-tensor-Gauss-Bonnet theory modified gravity

On the Boundary Condition and Related Instability in the Smoothed Particle Hydrodynamics

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Communications in Theoretical Physics 2019年第11期71卷 1281-1292页

作者： Chong Ye Jin Li Kai Lin Wei-Liang Qian College of Physics Chongqing UniversityChongqing 401331China Centro Brasileiro de Pesquisas Fisicas 22290-180Rio de JaneiroRJBrazil Institute of Geophysics and Geoinforma tics China University of GeosciencesWuhan 430074China escola de engenharia de lorena Universidade de Sao Paulo12602-810LorenaSPBrazil Faculdade de engenharia de Guaratinguetá Universidade Estadual Paulista12516-410GuaratinguetaSPBrazil School of Physical Science and Technology Yangzhou UniversityYangzhou 225002China

In this work, we explore various relevant aspects of the Smoothed Particle Hydrodynamics regarding Burger's equation. The stability, precision, and efficiency of the algorithm are investigated in terms of different *** particular, we argue that the boundary condition plays an essential role in the stability of numerical ***, the issue is shown to be closely associated with the initial particle distribution and the interpolation *** others, we introduce an interpolation scheme termed symmetrized finite particle method. The main advantage of the scheme is that its implementation does not involve any derivative of the kernel function. Concerning the equation of motion, the calculations are carried out using two distinct scenarios, where the particles are chosen to be either stationary or dynamically evolved. The obtained results are compared with those obtained by using the standard finite difference method for spatial derivatives. Our numerical results indicate subtle differences between different schemes regarding the choice of boundary condition. In particular, a novel type of instability is observed where the regular distribution is compromised as the particles start to traverse each other. Implications and further discussions of the present study are also addressed.

关键词： hydrodynamic model SPH algorithm pair instability

Neutral regular black hole solution in generalized Rastall gravity

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Chinese Physics C 2019年第8期43卷 81-85页

作者： Kai Lin Wei-Liang Qian Hubei Subsurface Multi-scale Imaging Key Laboratory Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074HubeiChina escola de engenharia de lorena Universidade de S?o Paulo12602-810LorenaSPBrazil Faculdade de engenharia de Guaratingueta Universidade Estadual Paulista12516-410GuaratinguetaSPBrazil Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

We investigate the static, spherically symmetric regular black hole solutions in the generalized Rastall gravity. In particular, the prescription of Rastall gravity implies that the present approach does not necessarily involve nonlinear electrodynamics. Subsequently, the resulting regular black hole solutions can be electrically and magnetically neutral. The general properties of the regular black hole solutions are explored. Moreover, specific solutions are derived and discussed, particularly regarding the parameter related to the degree of violation of the energy-momentum conservation in the Rastall theory.

关键词： regular black hole generalized Rastall gravity static spherically symmetrical spacetime