Concepts for possible use of high temperature superconductors in millimeter/submillimeter wave cavities, mode convertors and waveguides are described. Reduction of the ohmic loss in the cavities could remove a major constraint on the power produced by high frequency gyrotrons. Significant benefits could be obtained without the need for ultra high values of cavity Q. Improved mode convertor perf...

voltage fluctuation is one of the important types of power quality aspects originated from heavy fluctuating loads. this phenomenon can influence the behavior of induction motors, produce excessive vibration and increase the ohmic losses. in this paper a simplified model to evaluate the electrical characteristics of three phase induction motors under voltage fluctuation conditions will be prese...

A general condition for sharp transition of decay rate from quantum to thermal regimes is derived in dissipative tunneling models when positiondependent mass is involved. It is shown that the effect of dissipation in general changes the order of the phase transition. Especially, for the models with constant mass the Ohmic dissipation enlarges the range of parameters for first order phase transi...

In recent years, the world’s food industry has focused increasing attention on electrical techniques of food processing. Ohmic heating is one of these techniques that can be considered as a high temperature short time and a purely bulk heating method, having potential applications in processes such as blanching, evaporation and pasteurization in the food industry. However such technology would ...

Radio frequency Ohmic loss due to non-ideal conductor boundaries seriously limits the performance of electronic devices. In this paper, losses two simple models are calculated by particle-in-cell (PIC) simulation, which is also verified theoretical calculation. Thereafter, based on PIC we have studied variation relativistic backward wave oscillators (RBWOs) with operating and material conductiv...

Ohmic heating is an alternative fast heating technique for food products, which takes its name from Ohm's law. The basic principle of ohmic heating is the conversion of electrical energy into heat, resulting in internal energy generation. In this study, an experimental ohmic heating unit was designed and fabricated. Four kinds of liquid food materials (tap water, fruit-vegetable juice, yogurt a...

For a good THz waveguide, both low propagating loss and small mode width are usually very important. However, the high ohmic loss of metals and the high absorption loss of dielectric materials result in that it still remains a challenge to obtain the two capabilities at the same time. In this paper, planar dielectric-gap-metal (DGM) waveguides are presented to guide THz wave. According to the d...

In this article we present infinitely many 3–manifolds admitting infinitely many universally tight contact structures each with trivial Ozsváth–Szabó contact invariants. By known properties of these invariants the contact structures constructed in this article are non weakly symplectically fillable.

We report on top-illuminated, fluorine tin oxide/indium tin oxide-free (FTO/ITO-free), dye-sensitized solar cells (DSCs) using room-temperature-processed ZnO layers on metal substrates as the working electrodes and Pt-coated Ga-doped ZnO layers (GZO) as the counter electrodes. These top-illuminated DSCs with GZO render comparable efficiency to those employing commercial FTO counter electrodes. ...