Effect of Temperature on the Rotational and Vibrational Relaxation Times of Some Hydrocarbons

1968 ◽  
Vol 49 (1) ◽  
pp. 440-444 ◽  
Author(s):  
G. L. Hill ◽  
T. G. Winter
Keyword(s):  
Vibrational Relaxation ◽  
Relaxation Times ◽  
Effect Of Temperature

scholarly journals Theoretical Effect of Temperature on Threshold in the Hodgkin-Huxley Nerve Model

1966 ◽  
Vol 49 (5) ◽  
pp. 989-1005 ◽  
Author(s):  
Richard Fitzhugh
Keyword(s):  
Relaxation Time ◽  
Relaxation Times ◽  
Giant Axon ◽  
Temperature Curve ◽  
Effect Of Temperature ◽  
Threshold Temperature ◽  
Ionic Conductances ◽  
And Shifts ◽  
The Right ◽  
Increasing Temperature

In the squid giant axon, Sjodin and Mullins (1958), using 1 msec duration pulses, found a decrease of threshold with increasing temperature, while Guttman (1962), using 100 msec pulses, found an increase. Both results are qualitatively predicted by the Hodgkin-Huxley model. The threshold vs. temperature curve varies so much with the assumptions made regarding the temperature-dependence of the membrane ionic conductances that quantitative comparison between theory and experiment is not yet possible. For very short pulses, increasing temperature has two effects. (1) At lower temperatures the decrease of relaxation time of Na activation (m) relative to the electrical (RC) relaxation time favors excitation and decreases threshold. (2) For higher temperatures, effect (1) saturates, but the decreasing relaxation times of Na inactivation (h) and K activation (n) factor accommodation and increased threshold. The result is a U-shaped threshold temperature curve. R. Guttman has obtained such U-shaped curves for 50 µsec pulses. Assuming higher ionic conductances decreases the electrical relaxation time and shifts the curve to the right along the temperature axis. Making the conductances increase with temperature flattens the curve. Using very long pulses favors effect (2) over (1) and makes threshold increase monotonically with temperature.

Vibrational Relaxation Times in Oxygen

1959 ◽  
Vol 30 (6) ◽  
pp. 1614-1615 ◽  
Author(s):  
Morris Salkoff ◽  
Ernest Bauer
Keyword(s):  
Vibrational Relaxation ◽  
Relaxation Times

Vibrational Relaxation Times in Nitrogen

1957 ◽  
Vol 27 (5) ◽  
pp. 1149-1155 ◽  
Author(s):  
S. J. Lukasik ◽  
J. E. Young
Keyword(s):  
Vibrational Relaxation ◽  
Relaxation Times

NQR Relaxation Studies on Halogenomethyl Groups in Halogenoacetates

1998 ◽  
Vol 53 (6-7) ◽  
pp. 480-483 ◽  
Author(s):  
Maria Zdanowska-Fnjczek
Keyword(s):  
Room Temperature ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Effect Of Temperature ◽  
Relaxation Theory ◽  
Temperature Range ◽  
Spin Lattice ◽  
Relaxation Studies

Abstract The effect of temperature on the chlorine NQR spin-lattice relaxation times in CsH(ClH2-CCOO)2 , KH(Cl3 CCOO) 2 and N(CH3)4 H(ClF2CCOO)2 has been studied in the temperature range 77 K to room temperature. The results were discussed on the basis of NQR relaxation theory.

Vibrational Relaxation Times in Gases

1950 ◽  
Vol 21 (12) ◽  
pp. 1319-1325 ◽  
Author(s):  
Wayland Griffith
Keyword(s):  
Vibrational Relaxation ◽  
Relaxation Times
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