Complex geometries can be embedded in a mesh by using an implicit boundary representation as in the level set method or any equivalent scalar field. Such approaches enable a much more flexible way for building complex multi-domain simulations than classical body-fitted techniques that required to constraint boundaries and interfaces into the volume mesh. However, the geometrical accuracy of imp...

Diagnostic technologies using X-rays and/or acoustic emissions for concrete infrastructures containing internal pores, defects, and cracks have attracted considerable interest. However, computerized tomography (CT) is challenging due to its radiation shielding characteristics. Electrical impedance (EIT), initially developed medical use, has recently shown a potential developing macro-CT techniq...

With the progress of society and diversification transportation modes, people are faced with more complicated travel choices, thus, multi-criteria route choosing optimization problems have drawn increased attention in recent years. A number traffic network equilibrium been proposed, but most them do not involve data uncertainty nor computational methods. This paper focuses on methods for solvin...

In order to accommodate solutions with multiple phases, corresponding to crossing rays, we formulate geometrical opties for the scalar wave équation as a kinetic transport équation set in phase space. If the maximum number of phases is finite and known a priori we can recover the exact multiphase solution from an associated System of moment équations, closed by an assumption on the form of the ...

A method to simulate bodies suspended in a Lattice Boltzmann solvent is proposed. It is based on a generalized reaction force that enforces no-slip boundary conditions at the fluid–body interface as the limiting case of an iterative procedure. A smooth version of the Heaviside function allows to treat spherical particles of arbitrary size and produces smooth hydrodynamic forces as particles mov...

A methodology for solving three-dimensional crack problems with geometries that are independent of the mesh is described. The method is based on the extended 5nite element method, in which the crack discontinuity is introduced as a Heaviside step function via a partition of unity. In addition, branch functions are introduced for all elements containing the crack front. The branch functions incl...

We present an algorithm to reduce the computational complexity for plane-wave codes used in electronic structure calculations. Our proposed algorithm avoids the diagonalization of large Hermitian matrices arising in such problems. The computational time for the diagonalization procedure typically grows as the cube of the number of atoms, or the number of eigenvalues required. To reduce this com...

As a first endeavour, nonlinear dynamic response of the glass fibre-reinforced​ epoxy (GRE) laminated composite cylindrical shells under an impulse load is investigated based on first-order shear deformation theory (FSDT) shells. Green’s strain and von Kármán hypothesis are assumed to consider geometrical nonlinearity due large in model. A new solution procedure composed differential quadrature...

In this letter, the genesis of spike-wave activity a hallmark of many generalized epileptic seizures is investigated in a reduced mean-field model of human neural activity. Drawing upon brain modelling and dynamical systems theory, we demonstrate that the thalamic circuitry of the system is crucial for the generation of these abnormal rhythms, observing that the combination of inhibition from r...