One of the key issues in GaN-based devices is resistivity and technology ohmic contacts to n-type GaN. This work presents, for first time, effective intentional oxygen doping sputtered GaN films obtain highly conductive n+-GaN:O films. We have developed a novel simple method these The based on room temperature magnetron sputtering single crystal bulk target doped with oxygen. exhibit polycrysta...

Two models of the neocortex are developed to study normal and pathological neuronal activity. One model contains a detailed description of a neocortical microcolumn represented by 656 neurons, including superficial and deep pyramidal cells, four types of inhibitory neurons and realistic synaptic contacts. Simulations show that neurons of a given type exhibit similar behavior in this detailed mo...

The nature of fast magnetoacoustic and Alfvén waves is investigated in a zero β plasma. This gives an indication of wave propagation in the low β solar corona. It is found that for a two-dimensional null point, the fast wave is attracted to that point and the front of the wave slows down as it approaches the null point, causing the current density to accumulate there and rise rapidly. Ohmic dis...

Contact centres have been exemplars of scientific management in the discipline of operations management for more than a decade now. With the movement of industries from a resource based economy to knowledge based economy businesses have started to realize the customer eccentricity being the key to sustainability amidst high velocity of the market. However, as technologies have converged and adv...

The linear theory for the onset of convection in a rotating layer with an imposed vertical magnetic field is studied for large Taylor (Ta) and Chandrasekhar (Q) numbers. The velocity and magnetic field perturbations are in magnetostrophic balance. For small values of σ = ν/κ and ζ = η/κ, where ν, κ and η are the kinematic viscosity, and thermal and ohmic diffusivities, three oscillatory modes a...

We studied possible evolution of rotational period and magnetic field of the X-ray source RX J0720.4-3125 assuming this source to be an isolated neutron star accreting from interstellar medium. Magnetic field of the source is estimated to be 10 6 − 10 9 Gs (most probably ≈ 2 · 10 8 Gs), and it is difficult to explain the observable rotational period 8.38 s without invoking hypothesis of the mag...

The conductance coefficients of disordered mesoscopic devices with n probes are investigated within the noninteracting electron approximation at zero temperature. The probes are eliminated from the theoretical description at the expense of introducing non-local boundary conditions at the position of the contacts. Conductors with a large number of weak contacts are analyzed in detail. The ensemb...

This work deals with the determination of the inactivation kinetics of several enzymes, most of them used as time-temperature integrators in the food industry. The tested enzymes were polyphenoloxidase, lipoxygenase, pectinase, alkaline phosphatase, and -galactosidase, and the inactivation assays were performed under conventional and ohmic heating conditions. The thermal history of the samples ...

The Ohmic heating rate of a food is highly influenced by its electrical conductivity. In this study, electrical conductivities, colour changes and system performance of liquid whole egg, white egg and yolk were determined on a laboratory scale static Ohmic heater by applying 30 V/cm voltage gradient. The samples were heated from room temperature through to pasteurization temperature (19 – 60°C)...

Sustaining a plasma in a magnetron discharge requires energization of the plasma electrons. In this work, Ohmic heating of electrons outside the cathode sheath is demonstrated to be typically of the same order as sheath energization, and a simple physical explanation is given. We propose a generalized Thornton equation that includes both sheath energization and Ohmic heating of electrons. The s...