Phenomenological Theory of the Molecular Absorption and Dispersion of Sound in Fluids and the Relation between the Relaxation Time of the Internal Energy and the Relaxation Time of the Internal Specific Heat

1957 ◽  
Vol 12 (1) ◽  
pp. 85-99 ◽  
Author(s):  
Otohiko Nomoto
Keyword(s):  
Relaxation Time ◽  
Specific Heat ◽  
Internal Energy ◽  
Phenomenological Theory ◽  
Molecular Absorption ◽  
Absorption And Dispersion

Magnetic properties, internal energy and specific heat of a three-layer Heisenberg system with six sublattices

2010 ◽  
Vol 405 (7) ◽  
pp. 1677-1685 ◽  
Author(s):  
Cheng-Bo Zhu ◽  
Wei Jiang ◽  
Veng-cheong Lo ◽  
Jun Yang ◽  
Wei Wang
Keyword(s):  
Magnetic Properties ◽  
Specific Heat ◽  
Internal Energy

QUANTUM CURRENT MAGNIFICATION EFFECTS FOR MUTUAL INDUCTANCES: THERMODYNAMIC CONSIDERATIONS

2009 ◽  
Vol 23 (28) ◽  
pp. 3333-3340 ◽  
Author(s):  
J. C. FLORES
Keyword(s):  
Specific Heat ◽  
Internal Energy ◽  
Spectral Band ◽  
Electrical Current ◽  
Quantum Circuits ◽  
The Face ◽  
Quantum Current

The robustness of quantum electrical current magnification in the face of thermodynamical decoherence is studied. Thermodynamical calculations for the specific heat, internal energy and electrical current suggest that magnification is decimated by temperature. The range of validity of the phenomenon is at order of the equivalent spectral band. With respect to the Milburn theory of decoherence, electrical current magnification is robust. Moreover, magnification phenomenon is widely exhibited in a large variety of quantum circuits and a wide variety of experimental setups can be envisaged.

Fast Dynamics in Glass-Formers: Relation to Fragility and the Kohlrausch Exponent

1996 ◽  
Vol 455 ◽  
Author(s):  
K. L. Ngai ◽  
C. M. Roland
Keyword(s):  
Relaxation Time ◽  
Low Temperature ◽  
Specific Heat ◽  
Raman Spectra ◽  
Low Temperatures ◽  
Coupling Model ◽  
Boson Peak ◽  
Specific Heat Data ◽  
Low Temperature Specific Heat ◽  
Heat Data

ABSTRACTFrom the Raman spectra and related inferences from low temperature specific heat data, Sokolov and coworkers have established that the ratio of the quasielastic and vibrational contributions at low temperatures (5∼10K) up to Tg correlates well with the degree of fragility and β of the glass-former. As pointed out by Sokolov (see his contribution in this Volume) such a correlation between the fast dynamics and structural a-relaxation at Tg(i.e., m and β) is intriguing, since at and below Tg, the α-relaxation time τα is more than twelve orders of magnitude longer than the quasielastic contribution and the boson peak. We show in this paper how the Coupling Model (CM) may provide an explanation for this correlation.

Ultrasonic relaxation of the vibrational specific heat of carbon dioxide, sulphur hexafluoride, nitrous oxide, cyclo propane and methyl chloride in the liquid state

1958 ◽  
Vol 247 (1249) ◽  
pp. 168-185 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
Relaxation Time ◽  
Specific Heat ◽  
Methyl Chloride ◽  
Substantial Part ◽  
Sulphur Hexafluoride ◽  
Single Relaxation Time ◽  
Full Analysis ◽  
Liquid States

Measurements have been made of the ultrasonic absorption and the velocity of propagation in a number of liquefied gases at temperatures from 0 to 50°C and over the frequency range 1 to 50 Mc/s. The observations in liquid carbon dioxide cover the major part of a relaxation region, centred about a frequency of approximately 10 Mc/s, and a full analysis is therefore possible in this case. The results are adequately described in terms of a relaxation of the total vibrational specific heat associated with a single relaxation time. For sulphur hexafluoride, nitrous oxide, cyclo propane and methyl chloride it was not possible to cover a substantial part of the relaxation region. In each case, however, the results are consistent with the assumption that the observed non-classical absorption is entirely due to vibrational relaxation and that the total vibrational specific heat relaxes with a single relaxation time. The corresponding characteristic frequencies are calculated and fall within the range 60 to 250 Mc/s. Comparisons are made between the values of the product, density ( ρ ) times relaxation time at constant temperature (ז T ), in the gaseous and liquid states for the above substances and for others, where adequate data is available. It is found that for a given temperature the ratio ( ρז T ) liquid ( ρז T ) gas is greater than, but close to, unity. It is concluded that vibrational transitions in liquids which are not highly associated occur by the mechanism of binary collisions between molecules. The quantity ( ρז T √ T ) –1 , which can be taken as a measure of the collision efficiency, increases with increasing temperature for non-polar liquids, but appears to depend very little on temperature for highly polar ones.

Enthalpy Relaxation Near the Glass Transition of a Supercooled Liquid [Ca(NO 3) 2]0.4[KNO3]0.6

1995 ◽  
Vol 407 ◽  
Author(s):  
I. K. Moon ◽  
Yoon-Hee Jeong
Keyword(s):  
Relaxation Time ◽  
Glass Transition ◽  
Specific Heat ◽  
Transition Region ◽  
Exponential Function ◽  
Supercooled Liquid ◽  
Frequency Range ◽  
Slow Dynamics ◽  
Glass Transition Region ◽  
Equilibrium Dynamics

ABSTRACTWe have investigated the slow dynamics in the glass transition region of a supercooled liquid [Ca(NO3)2]0.4[KN3]0.6 by measuring the dynamic specific heat in the frequency range from 0.01 Hz to 5 kHz. The equilibrium dynamics of the system in this range is well described by the stretched exponential function, exp[-(t/τ)β], and the Vogel-Fulcher type relaxation time, τ = τ0exp[Δ/(T − T0)].

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