Many stormy events in astrophysics occur due to the sudden magnetic energy release. This is possible if a magnetic configuration abruptly changes its topology, an event usually referred to as magnetic reconnection. It is known that pure Ohmic decay is inefficient, occurring during cosmological times (due to the huge characteristic scales L). It is recognized that the presence of current sheets ...

The dependence of contact resistance on current has been measured for a large number of ohmic contacts to quantized Hall resistors under quantum Hall effect conditioDS.Five different functional forms of current dependence are observed at low currents. The trend from best to worst quality can be correlated with the density of defects in the contact, regardless of the physical cause of the defect...

Visible light-sensitive photocatalyst was developed by combining n-type silicon (n-Si) and tungsten trioxide (WO3, n-Si/WO3), yielding an ohmic contact in between. In this system, the ohmic contact acted as an electron-and-hole mediator for the transfer of electrons and holes in the conduction band (CB) of WO3 and in the valence band (VB) of n-Si, respectively. Utilizing thusconstructed n-Si/WO...

A multi-faceted study on the reduction of ohmic contact resistance to AlN/GaN-based heterostructures is presented. Minimum contact resistance of 0.5 X mm has been achieved by partially etching the AlN barrier layer using a chlorine-based plasma dry-etch prior to ohmic contact metallization. For thin GaNcapped AlN/GaN heterostructures, we find it is necessary to remove the GaN cap in the vicinit...

The magnetic field of the Earth is generated by convection in the liquid-core and the energy necessary for this process comes from the cooling of the core which provide several buoyancy sources. The thermodynamics of this system is used to relate the Ohmic dissipation in the core to all energy sources and to model the thermal evolution of the core. If the same dissipation is maintained just bef...

The kinematic evolution of axisymmetric magnetic and electric elds near a rotating black hole is investigated numerically in Kerr geometry. In the cases investigated it is found that a magnetic eld cannot be sustained against Ohmic dissipation. In at space, this result is known as Cowling's anti-dynamo theorem. No support is found for the possibility that a gravitomagnetic dynamo eeect could le...

We investigate a possibility of heating of the loops and other closed magnetic structures in active regions of the solar corona by the flow of solar wind (plus other flows that may be present) across the magnetic field lines (that are perpendicular to the flow), in a similar manner as a conventional MHD generator works. A simple model is formulated which allows to calculate the typical currents...

The ion temperature was estimated using measurements provided by optical system based on the two-grating spectrometer on the COMPASS tokamak. It was done by analysis of Doppler-broadened CIII spectral lines at about 465 nm. The ion temperature in the range of 30–35 eV was measured at the plasma edge in short low-current ohmic discharges.