Prof.Nandakumaran V Mhttp://dyuthi.cusat.ac.in:80/xmlui/handle/purl/18192014-09-23T16:25:33Z2014-09-23T16:25:33ZFrustrated limit cycle and irregular behaviour in a nonlinear pendulumAmbika, GNandakumaran, V Mhttp://dyuthi.cusat.ac.in:80/xmlui/handle/purl/27072012-01-31T20:30:11Z1990-01-25T00:00:00ZFrustrated limit cycle and irregular behaviour in a nonlinear pendulum
Ambika, G; Nandakumaran, V M
We discuss how the presence of frustration brings about
irregular behaviour in a pendulum with nonlinear
dissipation. Here frustration arises owing to
particular choice of the dissipation. A preliminary
numerical analysis is presented which indicates the transition
to chaos at low frequencies of the driving force.
1990-01-25T00:00:00ZUniversal behaviour in a ``modulated'' logistic mapHarikrishnan, K PNandakumaran, V Mhttp://dyuthi.cusat.ac.in:80/xmlui/handle/purl/25712011-11-30T20:30:21Z1987-12-07T00:00:00ZUniversal behaviour in a ``modulated'' logistic map
Harikrishnan, K P; Nandakumaran, V M
We study the period-doubling bifurcations to chaos in a logistic map with a nonlinearly modulated parameter and show that the bifurcation structure is modified significantly. Using the renormalisation method due to Derrida et al. we establish the universal behaviour of the system at the onset of chaos.
1987-12-07T00:00:00ZOn the role of acoustic plasmons in high Tc superconductorsNandakumaran, V Mhttp://dyuthi.cusat.ac.in:80/xmlui/handle/purl/25702011-11-30T20:30:20Z1987-07-01T00:00:00ZOn the role of acoustic plasmons in high Tc superconductors
Nandakumaran, V M
The role of acoustic plasmons in the recently discovered high Tc superconductors
is discussed. It is shown that the exchange of acoustic plasmons together with the
usual phonon exchange between electrons can give rise to a Tc - 100 K.
1987-07-01T00:00:00ZEvidence for the existence of Sarkovskii ordering in a two-dimensional mapHarikrishnan, K PNandakumaran, V Mhttp://dyuthi.cusat.ac.in:80/xmlui/handle/purl/25692011-11-30T20:30:20Z1988-11-21T00:00:00ZEvidence for the existence of Sarkovskii ordering in a two-dimensional map
Harikrishnan, K P; Nandakumaran, V M
We analyse numerically the bifurcation structure of a two-dimensional noninvertible map and show that different periodic cycles are arranged in it exactly in the same order as in the case of the logistic map. We also show that this map satisfies the general criteria for the existence of Sarkovskii ordering, which supports our numerical result. Incidently, this is the first report of the existence of Sarkovskii ordering in a two-dimensional map.
1988-11-21T00:00:00Z