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## Current trends in the theories of gas-surface interaction

### Pramana (1986-10-01) 27: 613 , October 01, 1986

## Remarks on binding energy of fermions in Newtonian gravity

### Pramana (1986-06-01) 26: 561 , June 01, 1986

The clarifications made regarding the binding energy in connection with a model for the internal structure of black holes are shown to be incorrect.

## Dynamic response and frequency dependent local field corrections for an electron gas system

### Pramana (1986-09-01) 27: 483 , September 01, 1986

## Further examples of integrable systems in two dimensions

### Pramana (1986-02-01) 26: 109-115 , February 01, 1986

The construction of the second constant of motion of second order for two-dimensional classical systems is carried out in terms of*z*=*q*_{1} +*iq*_{2} and*q*=*q*_{1} −*iq*_{2}. As a result a class of Toda-type potentials admitting second order invariants is explored.

## Higher-order effects in large-angle coplanar symmetric (e, 2e) processes at high energies

### Pramana (1986-09-01) 27: 409-412 , September 01, 1986

The triple differential cross-sections for the ionization of atomic hydrogen by fast electrons are considered in the case of a coplanar symmetric energy-sharing geometry. They are estimated in the modified Glauber (MG) approximation. It is found that MG results are significantly different from those in the second Born approximation only for 90°⩽*ϑ*⩽110°. Outside this range they are almost identical.

## Accurate measurement of thermal expansion of solids between 77 K and 350 K by 3-terminal capacitance method

### Pramana (1986-11-01) 27: 647-660 , November 01, 1986

The construction of a three-terminal capacitance cell and a bath type cryostat to measure thermal expansion of solids in the temperature range 77 K to 350 K is described. Calculation of the thermal expansion coefficients by using spline approximation is discussed along with the various errors involved in the measurement. The capacitance cell is calibrated by using aluminium and germanium as standard reference materials. The cell has an accuracy of 4% in the measurement of thermal expansion coefficient and a resolution of 1 Å change in length of sample of length 1 cm.

## Baryon asymmetry generation through preonic monopoles

### Pramana (1986-09-01) 27: 479-482 , September 01, 1986

A scheme is presented for baryon asymmetry generation in early universe through monpole-induced baryon number violating processes in the context of a preonic model.

## Paramagnetic nematic liquid crystals

### Pramana (1986-11-01) 27: L713-L715 , November 01, 1986

The paper reports new nematic liquid crystals that are paramagnetic.

## Effect of polymerization and depolymerization reactions on molecular size distribution in living polymers

### Pramana (1986-07-01) 27: 43-45 , July 01, 1986

In this paper we have derived an exact expression for the molecular size distribution in living polymers for batch polymerization when depropagation is simultaneously operative. This expression is valid at a point of time when inhomogeneity is slightly greater than half that of the final equilibrium distribution.

## Charged particle orbits in the field of two charges placed symmetrically near a schwarzschild black hole

### Pramana (1986-10-01) 27: 485-495 , October 01, 1986

From the Copson and Linet solution for the electrostatic field due to a point charge near a Schwarzschild black hole, we have deduced the field due to two equal charges placed symmetrically (diametrically opposite) about the hole. It turns out that the motion of a test-charged particle is completely solvable only in the equatorial plane, because the*ϑ*-equation does not yield the first integral for*ϑ* ≠*π*/2. We have however considered circular orbits about the axis for*ϑ*=constant ≠*π*/2 by requiring both*ϑ* and*r* to remain fixed all through the motion. For*ϑ* ≠*π*/2 orbits, in contrast to the similar classical situation, there occur forbidden*ϑ*-ranges. This seems to be a relativistic effect.