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## Harlan j. smith 1924–1991

### Journal of Astrophysics and Astronomy (1992-03-01) 13: 145-149 , March 01, 1992

## Editorial

### Journal of Astrophysics and Astronomy (1992-03-01) 13: 1 , March 01, 1992

## Globular clusters as gamma ray sources

### Journal of Astrophysics and Astronomy (1992-12-01) 13: 287-291 , December 01, 1992

There are indications now that globular clusters contain a large number of low magnetic field millisecond pulsars. Since millisecond pulsars are expected to emit γ-rays due to curvature radiation, it is likely that globular clusters will themselves be sources of γ-rays bright enough to be detectable by present day instruments. Using the expression derived by Scharlemann, Arons & Fawley (1978) of the energy acquired by the electrons moving along the open magnetic field lines of the pulsars we have calculated the likely luminosity of γ-rays from globular clusters. We discuss our results in the light of the calculations reported in the literature based on some of the other models.

## State generators and complex neural memories

### Pramana (1992-03-01) 38: 271-278 , March 01, 1992

The mechanism of self-indexing for feedback neural networks that generates memories from short subsequences is generalized so that a single bit together with an appropriate update order suffices for each memory. This mechanism explains how stimulating an appropriate neuron can recall a memory. Although information is distributed in this model, yet our self-indexing mechanism makes it appear localized. Also a new complex valued neuron model is presented to generalize McCulloch-Pitts neurons.

## Quantum cosmology inR 1×S 1×S n space time

### Pramana (1992-09-01) 39: 265-271 , September 01, 1992

Classical and quantum cosmological aspects for (*n* + 2) dimensional anisotropic spherically symmetric space-time with topology of (*n* + 1) space*S*^{1}×*S*^{n} have been studied. The Lorentzian field equations are reduced to an autonomous system by a change of field variables and are discussed near the critical points. The path integral expression for propagation amplitude is converted to a single ordinary integration over the lapse function by the usual technique and is evaluated in terms of Bessel functions.

## q-Anharmonic oscillator with quartic interaction

### Pramana (1992-11-01) 39: 521-528 , November 01, 1992

The first order perturbative correction to the energy levels of a boson realization of a*q*-oscillator due to a quartic term in the potential energy is evaluated. We also discuss the statistical mechanics of*q*-anharmonic oscillators in the case where the parameter*q* deviates slightly from unity.

## Phase-function method for complex potentials

### Pramana (1992-11-01) 39: 501-508 , November 01, 1992

We consider the scattering problem for absorptive interactions within the framework of phase-function method. A Green’s function approach is used to derive the phase equation. As a case study we apply the algorithm presented on a shallow α-α potential, the real and imaginary parts of which have been deduced from experimental data. The real and imaginary parts of the*S*-wave phase shift are found to vary smoothly with energy while those for*D* and*G* waves show some fluctuations in the low-energy region. It is shown that studies in spatial behaviour of the phase function provide a plausible explanation for the dynamical origin of these fluctuations.

## A novel study of charged carbon clusters using a tandem Van de Graaff accelerator

### Pramana (1992-11-01) 39: L583-L587 , November 01, 1992

A conventional tandem Van de Graaff accelerator is used to produce charged carbon cluster beams. The unique capability of the method for studying highly charged clusters unaccessible to other methods of producing cluster beams is demonstrated.

## Non-adiabatic gravitational collapse of charged radiating fluid spheres

### Pramana (1992-07-01) 39: 17-25 , July 01, 1992

Dynamical equations governing the non-adiabatic collapse of a shear-free spherical distribution of unisotropic matter in the presence of charge are obtained. A brief outline of constructing a model describing collapse of a charged radiating fluid sphere in the set up developed is given.