Peristaltic motion of a magnetohydrodynamic micropolar fluid in a tube

This study is concerned with the magnetohydrodynamic flow of a micropolar fluid in a circular cylindrical tube. The equations governing the flow are modeled using the assumptions of long wavelength and low Reynolds number. It is found that the governing equations are coupled partial differential equations for the flow velocity and the microrotation. The finite difference scheme is used to integrate the equations and the results are graphically presented and discussed. Special emphasis is given to the effects of micropolar fluid parameters, tube wall peristaltic amplitude and magnetic parameter on the transverse profiles of velocity and microrotation as well as pumping characteristics and trapping phenomena.     

Modeling and analysis of peristalsis of hybrid nanofluid with entropy generation

Journal of Thermal Analysis and Calorimetry - This investigation intends to explore the peristaltic transport of rotating fluid in a channel. The channel is considered symmetric with flexible...     

Poly(amidoxime) functionalized MoS2 for efficient adsorption of uranium(VI) in aqueous solutions

Journal of Radioanalytical and Nuclear Chemistry - A novel adsorbent for enrichment of trace uranium (U(VI)) ions in aqueous solution is designed based on the excellent adsorption capacity of...     

Electromagnetic Time Reversal Algorithms and Source Localization in Lossy Dielectric Media

The problem of reconstructing the spatial support of an extended radiating electric current source density in a lossy dielectric medium from transient boundary measurements of the electric fields is studied. A time reversal algorithm is proposed to localize a source density from loss-less wave-field measurements. Further, in order to recover source densities in a lossy medium, we first build attenuation operators thereby relating loss-less waves with lossy ones. Then based on asymptotic expansions of attenuation operators with respect to attenuation parameter, we propose two time reversal strategies for localization. The losses in electromagnetic wave propagation are incorporated using the Debye's complex permittivity, which is well-adopted for low frequencies (radio and microwave) associated with polarization in dielectrics.     

Dynamics of a hepatitis B model with saturated incidence

In this article, we present a hepatitis B epidemic model with saturated incidence. The dynamic behaviors of the deterministic and stochastic system are studied. To this end, we first establish the local and global stability conditions of the equilibrium of the deterministic model. Second, by constructing suitable stochastic Lyapunov functions, the sufficient conditions for the existence of ergodic stationary distribution as well as extinction of hepatitis B are obtained.     

Stationary Distribution and Extinction of a Stochastic HIV-1 Infection Model with Distributed Delay and Logistic Growth

Journal of Nonlinear Science - In this paper, we propose a stochastic HIV-1 infection model with distributed delay and logistic growth. Firstly, we transfer the stochastic model with weak kernel...     

Fixed-time synchronization of four-dimensional energy resource systems with mismatched parameters

In this paper, we establish sufficient conditions for the existence of positive solutions for a class of higher order Riemann–Liouville fractional initial value problems. First, we construct an appropriate Banach space and prove the equivalence between the posed problem and the associated Volterra integral equation, then by means of Guo–Krasnoselskii fixed point theorem, we investigate the existence of at least one positive solution under sublinearity conditions.     

Can Hamilton energy feedback suppress the chameleon chaotic flow?

Nonlinear Dynamics - The dynamical behaviors of nonlinear systems are much dependent on the parameter setting and nonlinear terms, and some controllable parameters can be adjusted to modulate the...     

Entanglement Purification of Nonlocal Quantum‐Dot‐Confined Electrons Assisted by Double‐Sided Optical Microcavities

A nondestructive parity‐check detector (PCD) scheme for two single‐electron quantum dots embedded in double‐sided optical microcavities is presented here. Using a polarization‐entangled photon pair, the PCD works in a parallel style and is robust to the phase fluctuation of the optical path length. In addition, based on this nondestructive PCD, an economic entanglement purification protocol for electron pairs is presented. The parties in quantum communication can increase the purification efficiency and simultaneously decrease the quantum source consumed for some particular fidelity thresholds. Therefore, this protocol has good applications in the future quantum communication and distributed quantum networks.     

A chaotic map with infinite number of equilibria in a bounded domain

The European Physical Journal Special Topics - Although chaotic flows with special properties in their equilibria have been investigated widely, such an effort about chaotic maps has been...