D P Ahalpara
Articles written in Pramana – Journal of Physics
Volume 6 Issue 2 February 1976 pp 59-63 Nuclear And Particle Physics
The deformation producing tendency of (
The effective matrix elements in (
Volume 6 Issue 4 April 1976 pp 222-225 Nuclear And Particle Physics
Shell model spectra of^{92}Tc and^{93}Ru
Shell model calculations for the nuclei^{91}Mo,^{92}Tc and^{93}Ru in the Talmi approach have been done. The ground state binding energies and the excitation spectra agree with experiment.
Volume 10 Issue 4 April 1978 pp 399-408 Nuclear And Particle Physics
Collective bands of the positive parity states in
Collective bands of the positive parity states in odd-
Volume 11 Issue 1 July 1978 pp 35-37
Enhanced isospin dependence of the empirical particle-hole effective interaction
The separation between
Volume 12 Issue 2 February 1979 pp 179-201 Nuclear And Particle Physics
The collective bands of positive parity states in odd-
The low-lying collective bands of positive parity states in (
The collective bands of states are in general well reproduced by the effective interactions. The excitation energies of the band head states are however off by about one MeV. The calculated magnetic moments of the band head
Volume 35 Issue 3 September 1990 pp 287-301 Research Articles
Model equations from a chaotic time series
A K Agarwal D P Ahalpara P K Kaw H R Prabhakara A Sen
We present a method for obtaining a set of dynamical equations for a system that exhibits a chaotic time series. The time series data is first embedded in an appropriate phase space by using the improved time delay technique of Broomhead and King (1986). Next, assuming that the flow in this space is governed by a set of coupled first order nonlinear ordinary differential equations, a least squares fitting method is employed to derive values for the various unknown coefficients. The ability of the resulting model equations to reproduce global properties like the geometry of the attractor and Lyapunov exponents is demonstrated by treating the numerical solution of a single variable of the Lorenz and Rossler systems in the chaotic regime as the test time series. The equations are found to provide good short term prediction (a few cycle times) but display large errors over large prediction time. The source of this shortcoming and some possible improvements are discussed.
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