This article describes mathematical models for phase separated mixtures of materials that are in pressure and velocity equilibrium but not necessarily temperature equilibrium. General conditions for constitutive model...This article describes mathematical models for phase separated mixtures of materials that are in pressure and velocity equilibrium but not necessarily temperature equilibrium. General conditions for constitutive models for such mixtures that exhibit a single mixture sound speed are discussed and specific examples are described.展开更多
We use molecular dynamics simulations to compute the Lyapunov spectra of many-particle systems resembling simple fluids in thermal equilibrium and in non-equilibrium stationary states. Here we review some of the most ...We use molecular dynamics simulations to compute the Lyapunov spectra of many-particle systems resembling simple fluids in thermal equilibrium and in non-equilibrium stationary states. Here we review some of the most interesting results and point to open questions.展开更多
We have numerically calculated the thermal entanglement of a two-qubit system at low temperatures in a isotropic Ising chain under an inhomogeneous magnetic field. It is shown that in the homogeneous magnetic field, t...We have numerically calculated the thermal entanglement of a two-qubit system at low temperatures in a isotropic Ising chain under an inhomogeneous magnetic field. It is shown that in the homogeneous magnetic field, the two- qubit system has entangled states. It is concluded that the presence of the inhomogeneity in the magnetic field plays an effective role on the entangled states. Finally, it is suggested that the inhomogeneity in the magnetic field can be used to create two separated entangled formations in a two-qubit system.展开更多
Using mean-field theory, we have studied the effect of quantum transverse anisotropies with RKKY interaction on the multi-layer transition and magnetic properties of the spin-1 Blume-Capel model of a system formed by ...Using mean-field theory, we have studied the effect of quantum transverse anisotropies with RKKY interaction on the multi-layer transition and magnetic properties of the spin-1 Blume-Capel model of a system formed by two magnetic multi-layer materials, of different thicknesses, separated by a non-magnetic spacer of thickness M. It is found that the multilayer magnetic order-disorder transition temperature depends strongly on the value of the transverse anisotropy. The multilayer transition temperature decreases when increasing the transverse anisotropy. Furthermore, there exists a critical quantum transverse anisotropy △xL beyond which the separate transitions occur in the two magnetic layers. The critical transverse anisotropy AxL decreases （increases） on increasing the non-magnetic spacer of thickness M （on increasing the crystal field）, and AxL undergoes oscillations as a function of the Fermi level.展开更多
Recent advances in nuclear theory and new astrophysical observations have led to the need for specific theoretical models applicable to dense-matter physics phenomena.Quantum chromodynamics(QCD)predicts the existence ...Recent advances in nuclear theory and new astrophysical observations have led to the need for specific theoretical models applicable to dense-matter physics phenomena.Quantum chromodynamics(QCD)predicts the existence of non-nucleonic degrees of freedom at high densities in neutron-star matter,such as quark matter.Within a confining quark matter model,which consists of homogeneous,neutral 3-flavor interacting quark matter with O(m_(s)^(4))corrections,we examine the structure of compact stars composed of a charged perfect fluid in the context of f(R,T)gravity.The system of differential equations describing the structure of charged compact stars has been derived and numerically solved for a gravity model with f(R,T)=R+2βT.For simplicity,we assumed that the charge density is proportional to the energy density,namely,ρ_(ch)=αρ.It is demonstrated that the matter-geometry coupling constant β and charge parameter α affect the total gravitational mass and the radius of the star.展开更多
Controlled C-N configurations,i.e.,pyrrolic-N,pyridinic-N,and graphitic-N,are promising strategies to tailor the carbon dots’(CDs)optical properties into the first near infrared(NIR)window(650-900 nm),a responsive ra...Controlled C-N configurations,i.e.,pyrrolic-N,pyridinic-N,and graphitic-N,are promising strategies to tailor the carbon dots’(CDs)optical properties into the first near infrared(NIR)window(650-900 nm),a responsive range for biomedical application.However,a deep understanding of the role of the C-N configuration in the CDs’properties is still challenging and thoughtprovoking owing to their complex structure.Here,an underlying pyrrolic-N concentration and position effect on the pyrrolic-N-rich CDs’absorption was comprehensively elucidated based on the integrated experimental and computational studies.The assynthesized pyrrolic-N-rich CDs exhibit a first NIR window absorption centered at 650 nm with high photothermal conversion.Pyrrolic-N concentrations from 1.4%to 11.3%and positions(edge and mid-site)were systematically investigated.A mid-site pyrrolic-N was subsequently generated after the pyrrolic-N concentration more than 10%.Edge-site pyrrolic-N induces a frontier orbital hybridization,reducing bandgap energy,while mid-site pyrrolic-N plays a critical role in inducing a first NIR window absorption owing to their high charge transfer.Also,pyrrolic-N-rich CDs inherit a bowl-like topological feature,elevating the CDs’layer thickness as much as 0.71 nm.This study shed light on the design and optimization of pyrrolic-N on CDs for the first NIR window responsive materials in any biomedical application.展开更多
Recent low-redshift observations have yielded the present-time Hubble parameter value H0=74 kms^-1 Mpc^-1.This value is approximately 10%higher than the predicted value of Ho=67.4 kms^-1 Mpc^-1,based on Planck's o...Recent low-redshift observations have yielded the present-time Hubble parameter value H0=74 kms^-1 Mpc^-1.This value is approximately 10%higher than the predicted value of Ho=67.4 kms^-1 Mpc^-1,based on Planck's observations of the Cosmic Microwave Background radiatio n(CMB)and the AC DM model.Phenomenologically,we show that,by adding an extra component,X,with negative density to the Friedmann equation,it can address the Hubble tension without changing the Planck's constraint on the matter and dark energy densities.To achieve a sufficiently small extra negative density,its equation-of-state parameter must satisfy 1/3 ≤ wx ≤ 1.We propose a quintom model of two scalar fields that realizes this condition and potentially alleviate the Hubble tension.One scalar field acts as a quintessence,while another "Wphantom" scalar con formally couples to matter such that a viable cosmological scenario is achieved.The model only depends on two parameters,心and 6,which represent the rolling tendency of the self-interacting potential of the quintessenee and the strength of the conformal phantom-matter coupling,respectively.The toy quintom model with H0=73.4 kms^-1 Mpc^-1(Quintom I)yields a good Supernovae-Ia luminosity fit and acceptable rBAO fit but slightly small acoustic multipole lA=285.54.A full parameter scan revealed that the quintom model was superior to the ACDM model in certain regions of the parameter space,0.02<δ<0.10,Ω(0)m<0.31,while significantly alleviating the Hubble tension,although it is not completely resolved.A benchmark quintom model.Quintom II,is presented as an example.展开更多
基金supported by the Los Alamos National Laboratory,an affir mative action/equal opportunity employer,operated by Los Alamos National Security,LLC,for the National Nuclear Security Administration of the U.S.Department of Energy under contract DE-AC52-06NA25396
文摘This article describes mathematical models for phase separated mixtures of materials that are in pressure and velocity equilibrium but not necessarily temperature equilibrium. General conditions for constitutive models for such mixtures that exhibit a single mixture sound speed are discussed and specific examples are described.
文摘We use molecular dynamics simulations to compute the Lyapunov spectra of many-particle systems resembling simple fluids in thermal equilibrium and in non-equilibrium stationary states. Here we review some of the most interesting results and point to open questions.
文摘We have numerically calculated the thermal entanglement of a two-qubit system at low temperatures in a isotropic Ising chain under an inhomogeneous magnetic field. It is shown that in the homogeneous magnetic field, the two- qubit system has entangled states. It is concluded that the presence of the inhomogeneity in the magnetic field plays an effective role on the entangled states. Finally, it is suggested that the inhomogeneity in the magnetic field can be used to create two separated entangled formations in a two-qubit system.
文摘Using mean-field theory, we have studied the effect of quantum transverse anisotropies with RKKY interaction on the multi-layer transition and magnetic properties of the spin-1 Blume-Capel model of a system formed by two magnetic multi-layer materials, of different thicknesses, separated by a non-magnetic spacer of thickness M. It is found that the multilayer magnetic order-disorder transition temperature depends strongly on the value of the transverse anisotropy. The multilayer transition temperature decreases when increasing the transverse anisotropy. Furthermore, there exists a critical quantum transverse anisotropy △xL beyond which the separate transitions occur in the two magnetic layers. The critical transverse anisotropy AxL decreases （increases） on increasing the non-magnetic spacer of thickness M （on increasing the crystal field）, and AxL undergoes oscillations as a function of the Fermi level.
基金financial support from the PCI program of the Brazilian agency"Conselho Nacional de Desenvolvimento Científico e Tecnológico"-CNPqsupported by King Mongkut's University of Technology Thonburi's Post-doctoral Fellowship。
文摘Recent advances in nuclear theory and new astrophysical observations have led to the need for specific theoretical models applicable to dense-matter physics phenomena.Quantum chromodynamics(QCD)predicts the existence of non-nucleonic degrees of freedom at high densities in neutron-star matter,such as quark matter.Within a confining quark matter model,which consists of homogeneous,neutral 3-flavor interacting quark matter with O(m_(s)^(4))corrections,we examine the structure of compact stars composed of a charged perfect fluid in the context of f(R,T)gravity.The system of differential equations describing the structure of charged compact stars has been derived and numerically solved for a gravity model with f(R,T)=R+2βT.For simplicity,we assumed that the charge density is proportional to the energy density,namely,ρ_(ch)=αρ.It is demonstrated that the matter-geometry coupling constant β and charge parameter α affect the total gravitational mass and the radius of the star.
基金This work was fully supported by the Indonesian Endowment Fund for Education and the Indonesian Science Fund through the International Collaboration RISPRO Funding Program(No.RISPRO/KI/B1/KOM/11/4542/2/2020).
文摘Controlled C-N configurations,i.e.,pyrrolic-N,pyridinic-N,and graphitic-N,are promising strategies to tailor the carbon dots’(CDs)optical properties into the first near infrared(NIR)window(650-900 nm),a responsive range for biomedical application.However,a deep understanding of the role of the C-N configuration in the CDs’properties is still challenging and thoughtprovoking owing to their complex structure.Here,an underlying pyrrolic-N concentration and position effect on the pyrrolic-N-rich CDs’absorption was comprehensively elucidated based on the integrated experimental and computational studies.The assynthesized pyrrolic-N-rich CDs exhibit a first NIR window absorption centered at 650 nm with high photothermal conversion.Pyrrolic-N concentrations from 1.4%to 11.3%and positions(edge and mid-site)were systematically investigated.A mid-site pyrrolic-N was subsequently generated after the pyrrolic-N concentration more than 10%.Edge-site pyrrolic-N induces a frontier orbital hybridization,reducing bandgap energy,while mid-site pyrrolic-N plays a critical role in inducing a first NIR window absorption owing to their high charge transfer.Also,pyrrolic-N-rich CDs inherit a bowl-like topological feature,elevating the CDs’layer thickness as much as 0.71 nm.This study shed light on the design and optimization of pyrrolic-N on CDs for the first NIR window responsive materials in any biomedical application.
基金supported by Rachadapisek Sompote Fund for Postdoctoral Fellowship,Chulalongkorn Universitysupported in part by the Thailand Research Fund(TRF)+2 种基金Office of Higher Education Commission(OHEC)Chulalongkorn University under grant(RSA6180002)supported by Postdoctoral Fellowship of King Mongkut’s University of Technology Thonburi。
文摘Recent low-redshift observations have yielded the present-time Hubble parameter value H0=74 kms^-1 Mpc^-1.This value is approximately 10%higher than the predicted value of Ho=67.4 kms^-1 Mpc^-1,based on Planck's observations of the Cosmic Microwave Background radiatio n(CMB)and the AC DM model.Phenomenologically,we show that,by adding an extra component,X,with negative density to the Friedmann equation,it can address the Hubble tension without changing the Planck's constraint on the matter and dark energy densities.To achieve a sufficiently small extra negative density,its equation-of-state parameter must satisfy 1/3 ≤ wx ≤ 1.We propose a quintom model of two scalar fields that realizes this condition and potentially alleviate the Hubble tension.One scalar field acts as a quintessence,while another "Wphantom" scalar con formally couples to matter such that a viable cosmological scenario is achieved.The model only depends on two parameters,心and 6,which represent the rolling tendency of the self-interacting potential of the quintessenee and the strength of the conformal phantom-matter coupling,respectively.The toy quintom model with H0=73.4 kms^-1 Mpc^-1(Quintom I)yields a good Supernovae-Ia luminosity fit and acceptable rBAO fit but slightly small acoustic multipole lA=285.54.A full parameter scan revealed that the quintom model was superior to the ACDM model in certain regions of the parameter space,0.02<δ<0.10,Ω(0)m<0.31,while significantly alleviating the Hubble tension,although it is not completely resolved.A benchmark quintom model.Quintom II,is presented as an example.
