Multiple steady solutions and hysteresis phenomenon in the square cavity flows driven by the surface with antisymmetric velocity profile are investigated by numerical simulation and bifurcation analysis.A high order s...
详细信息
Multiple steady solutions and hysteresis phenomenon in the square cavity flows driven by the surface with antisymmetric velocity profile are investigated by numerical simulation and bifurcation analysis.A high order spectral element method with the matrix-free pseudo-arclength technique is used for the steady-state solution and numerical *** complex flow patterns beyond the symmetry-breaking at Re≈320 are presented by a bifurcation diagram for Re<*** results of stable symmetric and asymmetric solutions are consistent with those reported in literature,and a new unstable asymmetric branch is obtained besides the stable branches.A novel hysteresis phenomenon is observed in the range of 2208
Since entangled multiple optical fields were identified as the building blocks of quantum networks,the quadripartite entangled optical fields have been produced by using four degenerate optical parametric amplifiers o...
详细信息
Since entangled multiple optical fields were identified as the building blocks of quantum networks,the quadripartite entangled optical fields have been produced by using four degenerate optical parametric amplifiers or two nondegenerate optical parametric amplifiers(NOPAs).However,realizing an efficient and compact source for multiple quantum users has remained an outstanding challenge,hindering their practical ***,we proposed a compact and feasible scheme to deterministically entangle four spatially separated optical fields,employing only a single ***,two-sided output NOPA-based optical fields were coupled on a beam splitter network to form the quadripartite entangled state,causing the deterministic generation of both the Greenberger–Horne–Zeilinger(GHZ)and the linear cluster states in this compact entanglement *** also obtained the optimal experimental parameters based on the simulation results,thereby providing a direct reference for experimental *** findings propose that the resultant GHZ and linear cluster states can be potentially applied in quantum-enhanced information science,specifically in quantum secret sharing,controlled quantum teleportation networks,and quantum-entangled atomic ensemble networks.
Global in time weak solutions to the α-model regularization for the three dimensional Euler-Poisson equations are considered in this paper. We prove the existence of global weak solutions to α-model regularization f...
详细信息
Global in time weak solutions to the α-model regularization for the three dimensional Euler-Poisson equations are considered in this paper. We prove the existence of global weak solutions to α-model regularization for the three dimension compressible EulerPoisson equations by using the Fadeo-Galerkin method and the compactness arguments on the condition that the adiabatic constant satisfies γ >4/3.
This article is concerned with the $$L^2$$ norm error analysis of high-order BDF methods for the incompressible Navier–Stokes equation subjected to no-slip boundary conditions. To mitigate the complexity of high-orde...
This article is concerned with the $$L^2$$ norm error analysis of high-order BDF methods for the incompressible Navier–Stokes equation subjected to no-slip boundary conditions. To mitigate the complexity of high-order time-stepping algorithms caused by decoupling strategies, we combine the prediction–correction technique with a generalized scalar auxiliary variable approach to devise a family of linear, energy stable BDF schemes up to fifth-order accuracy in time. All the proposed schemes can be decoupled into a sequence of Poisson-type equations for the pressure and velocity fields, which significantly reduces the size of the linear systems at each time step. To deal with the essential difficulty raised by the non-A-stability of high-order BDF schemes, we introduce a class of discrete orthogonal convolution kernels to develop a unified framework for the $$L^2$$ norm convergence analysis of the proposed high-order BDF schemes. The velocity attains optimal rate of convergence in the $$L^2$$ norm under some mild mesh restrictions. Furthermore, building on the recent results concerning the positive definiteness of high-order BDF convolution kernels, we also provide an error estimate of the pressure in a weak $$L^2$$ norm. Benchmark examples including the Taylor–Green vortex problem and the regularized lid-driven cavity flow with Reynolds numbers up to 5000 are included to verify the stability and high accuracy of our numerical schemes.
We propose new seven-equation model and related solution methods for compressible two-phase flows. The model is built on new closure laws for the interaction between the coexisting two phases. It takes a symmetric for...
详细信息
We investigate the nonequilibrium steady state of the anisotropic open quantum Rabi model, which exhibits first-order and second-order dissipative phase transitions upon varying the degree of anisotropy between the co...
详细信息
We investigate the nonequilibrium steady state of the anisotropic open quantum Rabi model, which exhibits first-order and second-order dissipative phase transitions upon varying the degree of anisotropy between the coupling strengths of rotating and counter-rotating terms. Using both semiclassical and quantum approaches, we find a rich phase diagram resulting from the interplay between the anisotropy and the dissipation. First, there exists a bistable phase where both the normal and superradiant phases are stable. Second, there are multicritical points where the phase boundaries for the first- and second-order phase transitions meet. We show that a new set of critical exponents governs the scaling of the multicritical points. Finally, we discuss the feasibility of observing the multicritical transitions and bistability using a pair of trapped ions where the anisotropy can be tuned by controlling the intensity of the Raman transitions. Our study enlarges the scope of critical phenomena that may occur in finite-component quantum systems, which could be useful for applications in critical quantum sensing.
NiCo-based superalloys exhibit higher strength and creep resistance over conventional *** effects on elastic properties of the γ and γ' phases in newly-developed NiCo-based superalloys were investigated by first...
详细信息
NiCo-based superalloys exhibit higher strength and creep resistance over conventional *** effects on elastic properties of the γ and γ' phases in newly-developed NiCo-based superalloys were investigated by first-principles calculation combined with special quasi-random *** lattice constant,bulk modulus,and elastic constants vary linearly with the Co concentration in the NiCo *** the selected(Ni,Co)3(Al,W)and(Ni,Co)3(Al,Ti)model γ' phase,the lattice constant,and bulk modulus show a linear trend with alloying element *** addition of Co,Ti,and W can regulate lattice mismatch and increase the bulk modulus,simultaneously.W-addition shows excellent performance in strengthening the elastic properties in the γ' *** become unstable with higher W and Ni contents,e.g.,(Ni0.75Co0.25)3(Al0.25 W0.75),and become brittle with higher W and Co addition,e.g.,Co3(Al0.25 W0.75).Furthermore,Co,Ti,and W can increase the elastic constants on the whole,and such high elastic constants always correspond to a high elastic *** anisotropy index always corresponds to the nature of Young's modulus in a specific direction.
The elastic anisotropy and superconductivity upon hydrostatic compression ofα,ω,and β Hf are investigated using first-principle *** results of elastic anisotropies show that they increase with increasing pressure f...
详细信息
The elastic anisotropy and superconductivity upon hydrostatic compression ofα,ω,and β Hf are investigated using first-principle *** results of elastic anisotropies show that they increase with increasing pressure for α and ω phases,while decrease upon compression forβ*** calculated superconducting transition temperatures are in excellent agreement with ***-phonon coupling constants(λ)are increasing with pressure for α and ω phases,while decreasing for β *** β phase,the large values ofλare mainly due to the obvious TA1 soft *** further compression,the TA1 soft vibrational mode will disappear gradually.
The Voronoi tessellation is a fundamental geometric data structure which has numerous applications in various scientific and technological fields. For large particle datasets, computing Voronoi tessellations must be c...
详细信息
Fusion reactions induced by the weakly bound nucleus 6Li with targets 28Si, 64Ni, 144Sm and 209Bi at energies around the Coulomb barrier are investigated within a three-body model where 6Li is described with an α + d...
详细信息
暂无评论