Electrohydrodynamic effect on natural convection in horizontal channels is investigated from a numerical point of view. The EHD effect is induced by narrow strip electrodes placed at the bottom wall of the channel. The channel is subjected in a first stage only to the electric forces, and in a second stage to the simultaneous action of a temperature gradient and an electric field. The interacti...

A dusty radio-frequency argon discharge is simulated with the use of a two-dimensional fluid model. In the model, discharge quantities as the fluxes, densities and electric field are calculated self-consistently. The charge and the density of the dust are calculated with an iterative method. During the transport of the dust, its charge is kept constant in time. The dust influences the electric ...

We compute the statistical entropy of the three charge (D1-D5-p) five dimensional black hole to sub-leading order in a large charge expansion. We find an agreement with the macroscopic calculation of the Wald entropy in R corrected supergravity theory. The two calculations have a overlapping regime of validity which is not the Cardy regime in the microscopic conformal field theory. We use this ...

The influence of space charge on emittance growth is studied in simulations of a coasting beam exposed to a strong octupolar perturbation in an otherwise linear lattice, and under stationary parameters. We explore the importance of selfconsistency by comparing results with a non-self-consistent model, where the space charge electric field is kept “frozen-in” to its initial values. For Gaussian ...

DC-electric field, being screened in 3D semiconductors, normally decays monotonically in space. Experimental studies of the DC electric field screening in Si-SiO 2 multiple quantum wells by electric field induced optical second-harmonic generation show a non-monotonic, oscillatory-like decay. The model of electrons localized inside quantum wells, with the first subband occupied, allows a descri...

Using the result that an electric charge-magnetic charge system carries an internal field angular momentum of eg/4π we arrive at two restrictions on magnetic monopoles via the requirement of angular momentum quantization and/or conservation. First we show that magnetic charge should scale in the opposite way from electric charge. Second we show that free, unconfined monopoles seem to be inconsi...

Electromagnetic waves (EMW) are formed by electric and magnetic fields, both together solution of Maxwell's equations. The magnetic field is solenoidal always, while the electric field is solenoidal in charge-neutral regions only. Hence, conventionally, free-space electromagnetic fields are transverse to the direction of propagation; also, there exists a electric scalar potential but not a magn...

A numerical calculation code was developed by employing a two-dimensional continuum model for the detailed design of MWPC (Multi-Wire Proportional Chamber) detectors. The temporal evolutions of electron and ion density distributions were evaluated for the time period required by ions to travel between the anode and the cathode. The temporal evolution of the electric field was also calculated to...

Many applications in beam physics, particularly those concerning transverse beam dynamics, call for an approximate computation of the transverse electric field produced by the charge distribution of the beam, namely the field components in the plane perpendicular to the beam motion. Mathematically, this approximation becomes exact in the limit of an infinitely long charge distribution that is a...