Temperature and Pressure Coefficients of Sound Velocity in Ethyl Alcohol

1960 ◽  
Vol 32 (11) ◽  
pp. 1511-1511
Author(s):  
Wayne Wilson
Keyword(s):  
Sound Velocity ◽  
Ethyl Alcohol ◽  
Pressure Coefficients ◽  
Temperature And Pressure

Ultrasonic Measurements with Rubber Compounds during Extrusion

1979 ◽  
Vol 52 (2) ◽  
pp. 294-303 ◽  
Author(s):  
R. Caspary ◽  
P. Kretschmer
Keyword(s):  
Carbon Black ◽  
Sound Velocity ◽  
Specific Volume ◽  
Carbon Black Content ◽  
Rubber Compounds ◽  
Ultrasonic Measurements ◽  
Temperature And Pressure ◽  
Reciprocal Value

Abstract The dependence of the Index of Elasticity, E, the reciprocal value of sound velocity, on temperature and pressure is related to specific volume and compressibility of rubbers. The sensitivity of E towards changes of temperature and pressure was calculated, indicating a new versatile possibility for the control of rubber extruders. To confirm this, extruder experiments were carried out with an SHR compound, of which a working diagram was established showing the complete behavior of E=f(p,T). The effect of compound composition, especially of plasticizer and carbon black content, was examined. Viscosity in the extruder primarily determines changes in E. The method was shown to be applicable up to a die diameter of at least 200 mm. The method may also be applied to follow degradation of rubber compounds during mastication.

Equilibrium model for the interpretation of the conduction properties of metal–ammonia solutions

1977 ◽  
Vol 55 (11) ◽  
pp. 2211-2216 ◽  
Author(s):  
S. Hahne ◽  
P. Krebs ◽  
U. Schindewolf
Keyword(s):  
Electrical Conductivity ◽  
Pressure Range ◽  
High Mobility ◽  
Solvation Number ◽  
Free Electrons ◽  
Solvated Electrons ◽  
Entire Concentration Range ◽  
Pressure Coefficients ◽  
Temperature And Pressure ◽  
Conduction Properties

The electrical conductivity of metal–ammonia solutions can be described by an equilibrium of solvated electrons of low mobility and of free electrons of high mobility. With proper choice of the equilibrium constant and its temperature and pressure dependence and of the solvation number of the solvated species the experimental conductivities can be matched in the temperature and pressure range from 240 to 420 K and up to 1000 bar over the entire concentration range from 0.1 mol/ℓ to saturation, also fitting the extrema of the temperature and pressure coefficients of the conductivity around 1 mol/ℓ.

Polymerization Reactions under high Pressure. I. Some Experiments with Isoprene and Butyraldehyde

1930 ◽  
Vol 3 (3) ◽  
pp. 472-482
Author(s):  
J. B. Conant ◽  
C. O. Tongberg
Keyword(s):  
High Pressure ◽  
Room Temperature ◽  
High Pressures ◽  
Order Reaction ◽  
Pressure Coefficients ◽  
First Order ◽  
Rate Of Polymerization ◽  
Energy Relationships ◽  
Temperature And Pressure ◽  
Autocatalytic Effect

Abstract 1. The rate of polymerization of isoprene under high pressures has been studied. The reaction is subject to positive catalysis by peroxides and negative catalysis by hydroquinone. Although the reaction is of a high order, the rate is approximately in accord with a first order reaction presumably because of an autocatalytic effect. The temperature and pressure coefficients of the rate have been estimated. The solubility and elasticity of the product depend on the extent to which the isoprene has been polymerized; when the polymerization is practically complete at room temperature at 12,000 atm. the product is very insoluble 2. The action of high pressures on n-butyraldehyde produces a solid only slightly soluble in organic solvents. It reverts to n-butyraldehyde rapidly. It is suggested that this polymer is similar to the well-known polymers of formaldehyde but that the energy relationships are such that the polymer is stable only at high pressures.

Temperature and pressure coefficients of iron resonant impurity level in PbTe

2017 ◽  
Vol 121 (4) ◽  
pp. 045702 ◽  
Author(s):  
E. P. Skipetrov ◽  
O. V. Kruleveckaya ◽  
L. A. Skipetrova ◽  
V. E. Slynko
Keyword(s):  
Impurity Level ◽  
Pressure Coefficients ◽  
Temperature And Pressure
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