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Biomedical subjects

I Triandaf

Publications and source records attributed to I Triandaf.

At least 19 recordsLinked to original sources
PubMed2000

Quality factor control in a lasing microcavity model

We consider a dynamics model of lasing microcavities, a class of optical resonators (1-10 &mgr;m in diameter) used in microlasers and for optical coupling of optical fibers. Inside such a cavity light circulates around the perimeter and is trapped by internal reflection. This is known as "whispering gallery" or high-Q modes. The cavity is a deformable cylindrical (or spherical) dielectric and at certain deformations light can escape by refraction. The quality of the resonator or Q factor, is defined as Q=omegatau, where tau is the escape time and omega is the frequency of light. We show that by appropriately deforming the cavity, the Q factor can be controlled by prolonging or shortening the average length of time spent by light trajectories inside the cavity.

Journal Article↗
PubMed2000

Origin of quasiperiodic dynamics in excitable media.

Analysis of the dynamic instabilities of periodic waves in a one-dimensional excitable ring medium demonstrates that driven oscillations of a pulse width display different oscillatory behavior at different values of stimulation frequency. Initial periodicity evolves to quasiperiodic dynamics when the propagation speed of a pulse approaches its minimal value determined by the dispersion relation of a medium.

Computer Simulation↗
PubMed2000

Tracking sustained chaos: A segmentation method

We introduce a segmentation control method to sustain chaotic transients in dynamical systems. The sustained transient can be tracked as a system parameter is substantially varied, allowing sustained chaotic transients far away from crisis parameter values. The method is applied to a chaotic CO2 laser as well as to a hyperchaotic continuum mechanics model.

Journal Article↗
PubMed1975

[Myocardial fibroelastosis].

One case of chronic non-obstructive cardiomyopathy diagnosed clinically died suddenly. Post-mortem examination established the diagnosis of endomyocardial fibroelastosis. It was insisted upon the extreme rarity of this form, on the criteria of clinical diagnosis, the diagnosis of cardiomyopathy being one of exclusion, and on the peculiar anatomical characteristics.

Adult↗