Molar volumes and isentropic compressions of pluronics L64 and P123 in aqueous surfactant solutions, over the critical temperature range of aggregation

2005 ◽  
Vol 252 (1) ◽  
pp. 43-50 ◽  
Author(s):  
A.H. Roux ◽  
G. Douhéret ◽  
G. Roux-Desgranges
Keyword(s):  
Critical Temperature ◽  
Molar Volumes ◽  
Temperature Range ◽  
Surfactant Solutions

Densities and molar volumes of the Ca(NO3)2-CaBr2-H2O system

1980 ◽  
Vol 45 (1) ◽  
pp. 17-20 ◽  
Author(s):  
Zdeněk Kodejš ◽  
Ivo Sláma
Keyword(s):  
Calcium Nitrate ◽  
Molar Ratio ◽  
Molar Volumes ◽  
Temperature Range

Molar volumes and densities of mixtures consisting of water, calcium nitrate, and calcium bromide have been determined in the range of molar ratio of water within 3 to 18 and in the temperature range of 20 to 80° C. The obtained results have been described by an equation derived under the assumption that additivity of molar volumes of the components is valid.

Critical constants and density dependence of the Lorenz–Lorentz coefficient for germane

1978 ◽  
Vol 56 (9) ◽  
pp. 1140-1141 ◽  
Author(s):  
P. Palffy-Muhoray ◽  
D. Balzarini
Keyword(s):  
Critical Temperature ◽  
Density Dependence ◽  
Experimental Error ◽  
Critical Density ◽  
Coexistence Curve ◽  
Index Of Refraction ◽  
Density Range ◽  
Temperature Range ◽  
Critical Constants

The index of refraction at 6328 Å has been measured for germane in the density range 0.15 to 0.9 g/cm3. The temperature and density ranges over which measurements are made are near the coexistence curve. The coefficient in the Lorenz–Lorentz expression, [Formula: see text], is constant to within 0.5% within experimental error for the temperature range and density range studied. The coefficient is slightly higher near the critical density. The critical density is measured to be 0.503 g/cm3. The critical temperature is measured to be 38.92 °C.

Low-temperature storage of mammalian spermatozoa

1957 ◽  
Vol 147 (929) ◽  
pp. 498-508 ◽  
Keyword(s):  
Critical Temperature ◽  
Low Temperatures ◽  
Freezing Point ◽  
Egg Yolk ◽  
Slow Cooling ◽  
Temperature Range ◽  
Low Temperature Storage ◽  
The Media ◽  
Extent Of Damage ◽  
Mammalian Spermatozoa

Experiments in this and other countries on the preservation of spermatozoa at very low temperatures have shown that no mammalian spermatozoa so far examined survive freezing when they are cooled ultra-rapidly from temperatures above freezing point to temperatures of — 79° C or below. Slow cooling and the addition of glycerol to the media in which the spermatozoa are suspended, however, permits survival of the spermatozoa of many species. In different animals, there are marked variations in the resistance of their spermatozoa to freezing and the proportion of spermatozoa which can be revived from very low temperatures may be influenced both by the concentration of glycerol added to the semen and by the composition of the diluting fluid. In experiments with the spermatozoa of the bull, ram, stallion and boar it has been found that during slow cooling to — 79° C there is a critical temperature range between — 15 and — 25° C at which the greatest amount of damage occurs. The rate at which the capacity for motility of the spermatozoa is destroyed within this critical temperature range is considerably reduced by allowing the spermatozoa to stand at 2° C in contact with a medium containing egg yolk and glycerol for 18 h before freezing. The extent of damage in the critical temperature range may also be reduced by cooling the specimens at a rate of 0-25 to 0-5° per second between —15 and —25° C.

scholarly journals SOUND VELOCITY AND SOUND ABSORPTION IN THE CRITICAL TEMPERATURE REGION

1951 ◽  
Vol 29 (3) ◽  
pp. 243-252 ◽  
Author(s):  
W. G. Schneider
Keyword(s):  
Critical Temperature ◽  
Liquid Phase ◽  
Sound Velocity ◽  
Temperature Region ◽  
Temperature Range ◽  
Maximum Value ◽  
Increasing Temperature ◽  
Very High ◽  
High Absorption ◽  
Liquid And Vapor Phases

The velocity and absorption of ultrasound (600 kc.) has been measured throughout the critical temperature region of sulphur hexafluoride. Measurements were carried out for the coexisting liquid phase and vapor phase below Tc, and for the supercritical gas, and simultaneously, observations of the meniscus behavior in the neighborhood of Tc were made. The sound velocity for both liquid and vapor phases below Tc decreased with increasing temperature and became equal at Tc, the velocity at this point being 121.5 m. per sec. In the temperature range from 0.6° below Tc to Tc the velocity in the vapor was greater than that in the liquid. A very high absorption of sound was observed, having a maximum value at Tc and extending over a temperature range of approximately 1°. In the temperature range from Tc to 0.6° below Tc, the absorption in the liquid phase was greater than that in the vapour.

THE NORMAL STATE HALL EFFECT IN NdBa2-xLaxCu3O7-δ: EVIDENCE FOR HOLE LOCALIZATION BY LA DOPING

2009 ◽  
Vol 23 (31) ◽  
pp. 5779-5788
Author(s):  
S. R. GHORBANI ◽  
F. ABRINAEY
Keyword(s):  
Critical Temperature ◽  
Hall Effect ◽  
Hall Coefficient ◽  
Normal State ◽  
Doping Concentration ◽  
Narrow Band ◽  
Band Model ◽  
Measured Temperature ◽  
Temperature Range ◽  
La Doping

The transport properties of sintered samples of NdBa 2-x La x Cu 3 O 7-δ with 0 ≤ x ≤ 0.3 have been studied in the normal state by Hall effect measurements. The Hall coefficient, RH is positive in the normal state and increases with increasing La doping concentration over the whole temperature range from the critical temperature, Tc, up to room temperature. The results for the Hall coefficient as a function of temperature and doping concentration were analyzed within the phenomenological narrow band and Anderson models. A good agreement between models and data was obtained. As in the phenomenological narrow band model, the band widths increase with increasing doping concentration. As in the Anderson model, the Hall angle is proportional to T2 over the whole measured temperature range for all samples. The obtained results for both models supported the view that La doping introduces electronic disorder into the CuO 2 planes. The tendency towards localization is driven by electronic disorder. In addition to hole filling, the localization is another reason for the decreasing superconducting critical temperature in these samples.

THE VAPOR PRESSURE OF VINYL ACETATE

1933 ◽  
Vol 9 (5) ◽  
pp. 419-423 ◽  
Author(s):  
J. Marsden ◽  
A. C. Cuthbertson
Keyword(s):  
Critical Temperature ◽  
Vapor Pressure ◽  
Vinyl Acetate ◽  
Boiling Point ◽  
Normal Boiling Point ◽  
Temperature Range ◽  
Heat Of Evaporation

This paper presents the results of the measurement of the vapor pressure of vinyl acetate, over the temperature range from 0 °C. to the normal boiling point. The determinations were carried out on vacuum distilled samples with an isoteniscope, differing slightly in detail from that used by Smith and Menzies(7).The normal boiling point is 72.5 °C. The molecular heat of evaporation has been found to be 8211 calories. The equation which represents the results is[Formula: see text]Trouton's constant and the critical temperature have been found to be 23.8 and 228.3 °C.

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