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Full-Text Articles in Physics
Liquid Crystal Displays, Peter J. Collings
Liquid Crystal Displays, Peter J. Collings
Physics & Astronomy Faculty Works
No abstract provided.
Autocorrelation Of Electrical Noise - An Undergraduate Experiment, J. Loren Passmore , '94, B. C. Collings, Peter J. Collings
Autocorrelation Of Electrical Noise - An Undergraduate Experiment, J. Loren Passmore , '94, B. C. Collings, Peter J. Collings
Physics & Astronomy Faculty Works
An undergraduate experiment is described in which the output of a noise generator is sampled by a computer equipped with a data acquisition board, after which the autocorrelation function is calculated. If the output of the noise generator passes through a low‐pass filter before it is sampled by the computer, then the autocorrelation function is a decreasing exponential function with a decay constant equal to the time constant of the low‐pass filter. The theory necessary to understand this phenomenon involves basic concepts in electrical noise, the analysis of linear systems, and Fourier transforms. In this paper the theoretical background for …
Evidence For A Supercritical ‘Transition’ To The Isotropic Phase In A Highly Chiral Liquid Crystal, Z. Kutnjak, C. W. Garland, John Loren Passmore , '94, Peter J. Collings
Evidence For A Supercritical ‘Transition’ To The Isotropic Phase In A Highly Chiral Liquid Crystal, Z. Kutnjak, C. W. Garland, John Loren Passmore , '94, Peter J. Collings
Physics & Astronomy Faculty Works
The results of two independent experiments in the vicinity of the “transition” from the third blue phase (BPIII) to isotropic phase (I) are reported for a highly chiral liquid crystal. Heat capacity measurements using a high-resolution calorimeter and dynamic light-scattering measurements using circularly polarized light have been performed. The data show a continuous evolution of BPIII into I with no critical fluctuations. This is strong evidence that the BPIII-I transition in this compound is supercritical, indicating that the BPIII and I phases possess the same macroscopic symmetry.
Supercritical Conversion Of The 3rd Blue Phase To The Isotropic-Phase In A Highly Chiral Liquid-Crystal, Z. Kutnjak, C. W. Garland, J. Loren Passmore, Peter J. Collings
Supercritical Conversion Of The 3rd Blue Phase To The Isotropic-Phase In A Highly Chiral Liquid-Crystal, Z. Kutnjak, C. W. Garland, J. Loren Passmore, Peter J. Collings
Physics & Astronomy Faculty Works
The results of two independent experiments in the vicinity of the “transition” from the third blue phase ( BPIII) to isotropic phase ( I) are reported for a highly chiral liquid crystal. Heat capacity measurements using a high-resolution calorimeter and dynamic light-scattering measurements using circularly polarized light have been performed. The data show a continuous evolution of BPIII into I with no critical fluctuations. This is strong evidence that the BPIII-I transition in this compound is supercritical, indicating that the BPIII and I phases possess the same macroscopic symmetry.
On Science Schooling, Seminar Style, Peter J. Collings
On Science Schooling, Seminar Style, Peter J. Collings
Physics & Astronomy Faculty Works
No abstract provided.
Performance Characterization Of The Caltech Compact Torus Injector, P. K. Loewenhardt, Michael R. Brown, J. Yee, P. M. Bellan
Performance Characterization Of The Caltech Compact Torus Injector, P. K. Loewenhardt, Michael R. Brown, J. Yee, P. M. Bellan
Physics & Astronomy Faculty Works
A device is described which is designed to refuel tokamaks of major radius [approximately-equal-to]1 m and magnetic field [approximately-equal-to]1 T by the injection of a compact torus. The injector utilizes an acceleration stage which adds kinetic energy to the compact torus so that it can penetrate the tokamak magnetic field. The performance of the device was found to be optimized in an unexpected parameter regime. It is theorized that in this regime the accelerator takes part in the formation of the CT. A performance threshold with respect to accelerator current will be presented and methods of impurity reduction will be …
Optical Measurements On The Bp Iii To Isotropic Phase Transition In Highly Chiral Liquid Crystals, Jonathan Brent Becker , '92, Peter J. Collings
Optical Measurements On The Bp Iii To Isotropic Phase Transition In Highly Chiral Liquid Crystals, Jonathan Brent Becker , '92, Peter J. Collings
Physics & Astronomy Faculty Works
Optical activity and light scattering measurements in the chiral-racemic system of 4-(2-methylbutyl) phenyl-4-hexyloxybenzoate (CE4) reveal a much larger decrease in the discontinuity at the third blue phase (BP III) to isotropic phase transition than reported previously using adiabatic scanning calorimetry on another compound. Whereas these new data show that the transition is still slightly discontinuous for the pure optical isomer of CE4, similar light scattering measurements on the pure optical isomer of 4″-(2- methylbutylphenyl)-4′-(2-methylbutyl)-4-biphenyl-carboxylate (CE2), which is more chiral than CE4, show no discontinuity at all.