Noise In Nonohmic Regimes Of Disordered Systems

We present here a short review of mainly experimental properties of noise as disordered systems are driven into non-ohmic regimes by applying voltages of few volts only. It is found that the noise does not simply follow the resistance in that the direction of change of noise could be opposite to that of resistance. It is discussed how this and other properties make the noise a complementary and incisive tool for studying complex systems, particularly its dynamic properties. Study of noise in non-ohmic regimes in physical systems is rather in a nascent stage. Some of the open issues are highlighted.Comment: 9 Pages, 7 figures. Reported in Unsolved Problems of Noise and Fluctuations: UPoN 2005, Gallipoli, Italy, June 6-10, 200

Present Trend on Refractory uses for Reheating Furnaces

The Reheating Furnaces play an important role in proce-ssing steel and its alloys for the production of finished products. The steel ingots, slabs or bars are heated in these furnaces to an even temperature throughout their body so that they can be properly rolled or pressed into strip, plate, rod, angle or any other shape as required. The temperature generally varies from 1130° to 1425°C, depending upon the quality of the steel, size of the product, etc Although the consumption of refractories per tonne of steel for the reheating furnaces Is not much, the object for the consumers is to have better and better refractories for getting longer life with less number of shutdowns for intermediate repairs. This will ultimately lead to reduced cost for refractories

Spin and the Coulomb Gap in the Half-Filled Lowest Landau Level

The Coulomb gap observed in tunneling between parallel two-dimensional electron systems, each at half filling of the lowest Landau level, is found to depend sensitively on the presence of an in-plane magnetic field. Especially at low electron density, the width of the Coulomb gap at first increases sharply with in-plane field, but then abruptly levels off. This behavior appears to coincide with the known transition from partial to complete spin polarization of the half-filled lowest Landau level. The tunneling gap therefore opens a new window onto the spin configuration of two-dimensional electron systems at high magnetic field.Comment: 6 pages, 4 postscript figures. Minor changes. To appear in Physical Review