SHORT TIME TRANSIENT TEMPERATURE PROFILES IN HIGH PURITY VITREOUS SILICA : A TIME DEPENDENT SPECIFIC HEAT

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-967-C6-969 ◽  
Author(s):  
J. E. Lewis ◽  
J. C. Lasjaunias ◽  
G. Shumacher
Keyword(s):  
Specific Heat ◽  
High Purity ◽  
Vitreous Silica ◽  
Time Dependent ◽  
Transient Temperature ◽  
Temperature Profiles ◽  
Short Time

scholarly journals Short-Time Photodissociation Dynamics of 1-Chloro-2-Iodoethane From Resonance Raman Spectroscopy

1999 ◽  
Vol 19 (1-4) ◽  
pp. 71-74 ◽  
Author(s):  
Xuming Zheng ◽  
David Lee Phillips
Keyword(s):  
Raman Spectroscopy ◽  
Absorption Spectrum ◽  
Raman Spectra ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman ◽  
Time Dependent ◽  
Internal Excitation ◽  
Band Absorption ◽  
Resonance Raman Spectra ◽  
Short Time

We have obtained A-band absorption resonance Raman spectra of 1-chloro-2- iodoethane in cyclohexane solution. We have done preliminary time-dependent wavepacket calculations to simulate the resonance Raman intensities and absorption spectrum in order to learn more about the short-time photodissociation dynamics. We compare our preliminary results for 1-chloro-2-iodoethane with previous resonance Raman results for iodoethane and find that there appears to be more motion along non- C—I stretch modes for 1-chloro-2-iodoethane than for iodoethane. This is consistent with results of TOF photofragment spectroscopy experiments which indicate much more internal excitation of the photoproducts from 1-chloro-2-iodoethane photodissociation than the photoproducts from iodoethane photodissociation.

Time-dependent specific heat in spin-glasses

1984 ◽  
Vol 29 (7) ◽  
pp. 4182-4184 ◽  
Author(s):  
I. Morgenstern
Keyword(s):  
Specific Heat ◽  
Spin Glasses ◽  
Time Dependent

A Harmonic Tracking Technique for Recovery of Gear Motion From Non-Stationary Vibration Signals

1995 ◽  
Author(s):  
Christopher A. Lerch ◽  
Richard H. Lyon
Keyword(s):  
Diagnostic System ◽  
Time Spectrum ◽  
Time Dependent ◽  
Invasive Technique ◽  
Signal Distortion ◽  
Vibration Signals ◽  
Tracking Method ◽  
Non Invasive ◽  
Stationary Vibration ◽  
Short Time

Abstract A method termed harmonic tracking is developed to recover time dependent gear motion from machine casing vibration. The harmonic tracking method uses short-time spectral generation and a subsequent set of algorithms to locate and track gear meshing frequencies as functions of time. The meshing frequencies are then integrated with respect to time to obtain the rotation of individual gears. More specifically, spectral generation is performed using the discrete Fourier transform, and the locating and tracking algorithms involve locating tones in each short-time spectrum and tracking them through successive spectra to recover gear meshing harmonics. The harmonic tracking method is found to be more robust than demodulation-based methods in the presence of measurement noise and signal distortion from the structural transfer function between gears and the casing. The harmonic tracking method is tested, both through simulation and experiments involving motor-operated valves (MOV’s) as part of the development of a diagnostic system for MOV’s. In all cases, the harmonic tracking method is found to recover gear motion with sufficient accuracy to perform diagnostics. The harmonic tracking method should be generally applicable to situations in which a non-invasive technique is required for determining the time-dependent angular speeds and displacements of gearbox input, intermediary, and output shafts.

The time dependent specific heat of dielectric glasses

Physica B+C ◽  
1982 ◽  
Vol 109-110 ◽  
pp. 1873-1879 ◽  
Author(s):  
M.T. Loponen ◽  
R.C. Dynes ◽  
V. Narayanamurti ◽  
J.P. Garno
Keyword(s):  
Specific Heat ◽  
Time Dependent
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