Visualisation-based analysis of structure and dynamics of liquid aluminosilicate under compression

Structure and dynamics of liquid aluminosilicate (Al₂O₃–2SiO₂, abbreviated as AS2) are investigated by molecular dynamics (MD) simulation and visualisation. The local structural characteristics are analysed via topology statistics of basic structural units TO_n and OT_m (T = Si, Al; n = 3, 4, 5, 6; m = 2, 3, 4, 5). The amount distribution as well as spatial distribution of the basic structural units under compression is also clarified. Regarding the intermediate range order, the amount and spatial distribution of all types of OT_m linkages as well as the bond statistics (corner-, edge-, and face-sharing) between two adjacent TO_n units are investigated in detail. The self-diffusion of Si, Al, and O is calculated via mean square displacement (MSD). The anomalous diffusion is explained in detail in relationship to structural characteristics. The structural and dynamical heterogeneities, micro-phase separation, and liquid–liquid phase transition are also discussed in this work.     

Rayleigh waves in an orthotropic elastic half-space overlaid by an elastic layer with spring contact

Meccanica - In this paper, the propagation of Rayleigh waves in an orthotropic elastic half-space overlaid by an orthotropic elastic layer of arbitrary uniform thickness is investigated. The layer...     

Prediction of bifurcations by varying critical parameters of COVID-19

Nonlinear Dynamics - Coronavirus disease 2019 is a recent strong challenge for the world. In this paper, an epidemiology model is investigated as a model for the development of COVID-19. The...     

An unstructured finite volume technique for the 3D Poisson equation on arbitrary geometry using a σ‐coordinate system

We present a solver for a three‐dimensional Poisson equation issued from the Navier–Stokes equations applied to model rivers, estuaries, and coastal flows. The three‐dimensional physical domain is composed of an arbitrary domain in the horizontal direction and is bounded by an irregular free surface and bottom in the vertical direction. The equations are transformed vertically to the σ‐coordinate system to obtain an accurate representation of top and bottom topographies. The method is based on a second‐order finite volume technique on prisms consisting of triangular grids in the horizontal direction. The algorithm is accompanied by an analysis of different linear system solvers in order to achieve fast solutions. Numerical experiments are conducted to test the numerical accuracy and the computational efficiency of the proposed method. Copyright © 2014 John Wiley & Sons, Ltd.     

Dynamics,circuit realization,control and synchronization of a hyperchaotic hyperjerk system with coexisting attractors

Although different hyperjerk systems have been discovered, a few hyperjerk systems can exhibit hyperchaotic behavior. In this work, we introduce a new hyperjerk system with hyperchaotic attractors. By investigating dynamics of the system, we have observed the different coexisting attractors such as coexistence of period-2 attractors, or coexistence of period-2 attractor and quasiperiodic attractor. It is worth noting that this striking phenomenon is rarely reported in a hyperjerk system. The proposed system has been realized with electronic components. The agreement between the simulation and experimental results indicates the feasibility of the hyperjerk system. Moreover, chaos control and synchronization of such hyperjerk system have been also reported.