The Fisher information matrix for the unknown moving targets velocity parameters is computed as function of the antenna radiation pattern. The resultant matrix is analysed and the characteristics that the antenna gain should exhibit in order to enhance the estimation of the unknown moving objects velocity vector are deduced. Simulation results comparing the various antenna radiation patterns en...

In this paper, we point out that the 4-vector force exerted on a particle by another particle is always in the direction orthogonal to the 4-vector velocity of the exerted particle in 4-dimensional space-time, rather than along the line joining the couple of the particles. This inference is obviously supported from the fact that the magnitude of the 4-vector velocity is always a constant. This ...

Fluids research often involves developing theories about the complex relationships between multiple scalar and vector quantities. We discuss strategies for effectively visualizing co-located vector fields, enabling the key physical structures of one vector field to be clearly understood within the context of a related vector field. We describe the range of effects that can be obtained by combin...

Abstract An algorithm is proposed for generalized mean curvature flow of closed two-dimensional surfaces, which include inverse and powers flow. Error estimates are proved semidiscretizations full discretizations the The studied here combines evolving surface finite elements, whose nodes determine discrete surface, linearly implicit backward difference formulae time integration. numerical metho...

Most of navigation techniques with obstacle avoidance do not consider the robot orientation at the target position. These techniques deal with the robot position only and are independent of its orientation and velocity. To solve these problems this paper proposes a novel univector field method for fast mobile robot navigation which introduces a normalized two-dimensional vector field. The metho...

Traditional artificial potential field method has the problem of local minimum and can not satisfy the requirements of real-time mobile robot path planning, security and accessibility in dynamic environment. To deal with the problems, through taking the advantage of velocity vector, modifying potential field force function, and integrating with the fuzzy control method, adjusting the factors of...

velocity vector fields by ultrasound particle imaging velocimetry: in vitro comparison with optical flow velocimetry. blood flow patterns in normal subjects: a quantitative analysis by three-dimensional magnetic resonance velocity mapping. A new echo-cardiographic method for identifying vortex flow in the left ventricle: numerical validation.dimensional intraventricular flow mapping by digital ...

This paper presents the two dimensional numerical modeling of the coupling electromagnetic-hydrodynamic phenomena in a conduction MHD pump using the Finite volume Method. Magnetohydrodynamic problems are, thus, interdisciplinary and coupled, since the effect of the velocity field appears in the magnetic transport equations, and the interaction between the electric current and the magnetic field...