Ionization of hydrogen atoms by electron impact at 1eV, 0.5eV and 0.3eV above threshold

We present here triple differential cross sections for ionization of hydrogen atoms by electron impact at 1eV, 0.5eV and 0.3eV energy above threshold, calculated in the hyperspherical partial wave theory. The results are in very good agreement with the available semiclassical results of Deb and Crothers \cite{DC02} for these energies. With this, we are able to demonstrate that the hyperspherical partial wave theory yields good cross sections from 30 eV \cite{DPC03} down to near threshold for equal energy sharing kinematics.Comment: 6 pages, 9 figure

M\"{o}ller and Bhabha scattering in the noncommutative standard model

We study the M\"{o}ller and Bhabha scattering in the noncommutative extension of the standard model(SM) using the Seiberg-Witten maps of this to first order of the noncommutative parameter $\theta_{\mu \nu}$. We look at the angular distribution $d\sigma/d\Omega$ to explore the noncommutativity of space-time at around $\Lambda_{NC} \sim$ TeV and find that the distribution deviates significantly from the one obtained from the commutative version of the standard model.Comment: 15 pages, 14 eps figures.Text is modified a little and version to appear in Phys.Rev.

Choice of Sampled Waves for Time-Division Multiplex Telephone Systems

We can have multiplex telephone Systems by using sampled voice signals on time division basis. These sampled voice signals may be used to operate the telephone receivers directly. The paper deals with the choice of the optimum frequency and width at which the voice signals are to be sampled in order that the telephone receivers may give the maximum output without having any appreciable distortion

Viscosity & Apparent Molal Volume of Potassium Chloride in Acetone-, Dioxane- & Methyl Alcohol-Water Mixtures

824-82

Ion-Solvent Interaction Studies of Chlorides, Bromides & Nitrates of Sodium & Potassium in Dioxane-Water Mixtures at Different Temperatures

826-82