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1994

Physics Faculty Research and Scholarship

Articles 1 - 4 of 4

Full-Text Articles in Physics

The Algorithmic Complexity Of Neural Spike Trains Increases During Focal Seizures, P. E. Rapp, I. D. Zimmerman, E. P. Vining, N. Cohn, Alfonso M. Albano, M. A. Jimenez Montano Aug 1994

The Algorithmic Complexity Of Neural Spike Trains Increases During Focal Seizures, P. E. Rapp, I. D. Zimmerman, E. P. Vining, N. Cohn, Alfonso M. Albano, M. A. Jimenez Montano

Physics Faculty Research and Scholarship

The interspike interval spike trains of spontaneously active cortical neurons can display nonrandom internal structure. The degree of nonrandom structure can be quantified and was found to decrease during focal epileptic seizures. Greater statistical discrimination between the two physiological conditions (normal vs seizure) was obtained with,measurements of context-free grammar complexity than by measures of the distribution of the interspike intervals such as the mean interval, its standard deviation, skewness, or kurtosis. An examination of fixed epoch data sets showed that two factors contribute to the complexity: the firing rate and the internal structure of the spike train. However, calculations ...


Excitation Of The Classical-Limit State Of An Atom, Z. D. Gaeta, Michael W. Noel, C. R. Stroud Jr. Jan 1994

Excitation Of The Classical-Limit State Of An Atom, Z. D. Gaeta, Michael W. Noel, C. R. Stroud Jr.

Physics Faculty Research and Scholarship

We describe a technique designed to excite a classical-limit state of an atom. A picosecond electric field pulse converts a circular state into a Rydberg wave packet which is localized in all three dimensions and travels along a classical Kepler orbit with arbitrary ellipticity.


Solid State Proton Spin Relaxation And Methyl And T-Butyl Reorientation, Peter A. Beckmann, Hania A. Al‐Hallaq, Anne M. Fry, Amy L. Plofker, Brian A. Roe, Jessica A. Weiss Jan 1994

Solid State Proton Spin Relaxation And Methyl And T-Butyl Reorientation, Peter A. Beckmann, Hania A. Al‐Hallaq, Anne M. Fry, Amy L. Plofker, Brian A. Roe, Jessica A. Weiss

Physics Faculty Research and Scholarship

We have measured the temperature T and Larmor frequency ω/2π dependence of the proton spin‐lattice relaxation rate R in solid 1‐hydroxy‐2,4,6‐tri‐butylbenzene. The data is interpreted in terms of the rotational motion of the t‐butyl groups and their constituent methyl groups. Our data is much more extensive than a previous report [J. Yamauchi and C. A. McDowell, J. Chem. Phys. 75, 1051 (1981)] resulting in a revised dynamical model and considerably larger rotational barriers. Interesting thermal history effects are discussed.


Solid State Proton Spin Relaxation And Methyl And T-Butyl Reorientation, Peter A. Beckmann, Hania A. Al-Hallaq, Anne M. Fry, Amy L. Plofker, Brian A. Roe, Jessica A. Weiss Jan 1994

Solid State Proton Spin Relaxation And Methyl And T-Butyl Reorientation, Peter A. Beckmann, Hania A. Al-Hallaq, Anne M. Fry, Amy L. Plofker, Brian A. Roe, Jessica A. Weiss

Physics Faculty Research and Scholarship

No abstract provided.