We present a detailed numerical study of a microscopic artificial swimmer realized recently by Dreyfus in experiments [Dreyfus, Nature 437, 862 (2005)]. It consists of an elastic filament composed of superparamagnetic particles that are linked together by DNA strands. Attached to a load particle, the resulting swimmer is actuated by an oscillating external magnetic field so that it performs a n...

We design, analyse and test a class of incomplete orthogonal factorization preconditioners constructed from Givens rotations, incorporating some dropping strategies and updating tricks, for the solution of large sparse systems of linear equations. Comprehensive accounts about how the preconditioners are coded, what storage is required and how the computation is executed for a given accuracy are...

A systematic process analysis was conducted to study the effect of main variables in an industrial electrostatic desalter, such as electric field intensity, wash water content, droplet size, and oil viscosity, on efficiency separation from oil. The assessed through already published validated CFD multiphase numerical model that considers expression frequency collisions a function mentioned vari...

AIM The aim of this study was to evaluate the biomechanical effects of the Maverick(R) disc prosthesis at the implanted and adjacent level by the finite element (FE) method. MATERIALS AND METHODS A 3D FE model of the L3-L5 segment was built. To simulate the different physiological movements (flexion, extension, lateral bending, axial rotation) pure moments of 10 Nm were applied. To evaluate t...

The Cox-Ingersoll-Ross (CIR) interest rate model is one of the most celebrated models in financial industry. The CIR interest rate model always has been the focus of study in mathematical finance litrature [2] as well as in the financial industry. It is also the area of interest in numerical science litrature [3 4 6 8 9 10 13 14 15 16 20] because of its non-explicit analytical solution. Signifi...

A simulation of 2-D turbulence in a square region with periodic boundary conditions has been performed using a highly accurate approximation of the inviscid Navier-Stokes equations to which a modified viscosity has reen added. A series of flow pictures show how a random initial vorticity distribution quickly a.ssumes a stringlike pattern which persists as the flow simplifies into a few "cyclone...

The particle filter method has been used in data assimilation problems for estimating states of nonlinear dynamic systems when both system errors and observation errors are present, and are possibly non-Gaussian. Weighted particles are used to represent the probability density function of the system states at any time. The particles are propagated through the system evolvement and the weights a...

The main point of proposed approach to study ants’ cognitive abilities is that our experiments provide a situation in which insects have to transmit information quantitatively known to the experimentalist, in order to obtain food. One may measure the complexity of tasks they solved in order to pass definite pieces of information from scout ants to foragers. Our previous experiments, basing on i...

Using COMSOL Multiphysics 3.5, a numerical model has been developed to determine the effect of the channel geometry and electrode configuration on cell performance based on polarization curves. The Butler-Volmer equation was implemented to determine the reaction rates at the electrodes. The Conductive Media DC module is used to model the electric fields within the fuel cell. The concentration d...

We study numerically essentially unsteady evaporation and heat transfer of a rarefied gas using the S-model kinetic equation. Three particular cases are considered: one-dimensional flow from a flat surface and purely radial flows from the surface of a cylinder or a sphere. We present numerical results for different values of the evaporation coefficient and saturatedvapor density which demonstra...