Direct Determination of Relative Permeability from Nonsteady-State Constant Pressure and Rate Displacements

2001 ◽  
Author(s):  
Janos Toth ◽  
Tibor Bodi ◽  
Peter Szucs ◽  
Faruk Civan
Keyword(s):  
Relative Permeability ◽  
Constant Pressure ◽  
Direct Determination ◽  
Nonsteady State

A 40 °C. ISOTHERMAL CALORIMETER

1950 ◽  
Vol 28b (10) ◽  
pp. 639-643 ◽  
Author(s):  
C. C. Coffin ◽  
E. J. Caule
Keyword(s):  
Solid State ◽  
Constant Pressure ◽  
Direct Determination ◽  
Controlled Conditions ◽  
Isothermal Calorimeter ◽  
Mantle Thickness

A 40° Bunsen-type isothermal calorimeter has been built and tested. The working substance, benzalacetone, is thermostatted by the vapor of methylal boiling under a constant pressure. An impurity in the benzalacetone makes it necessary to calibrate the instrument in exactly the same way in which it is to be used. Under carefully controlled conditions and with a constant mantle thickness the reproducibility is of the order of 0.2%. With about half the benzalacetone in the solid state, the calorimeter constant was found to be 0.0455 (± 0.0001) gm. of mercury per calorie. This instrument, which can be readily adapted to micro and semimicro work, was designed primarily for the direct determination of the heats and rates of certain enzymatic and bacteriological processes.

The Direct Determination of I131 in Heterogeneous Fecal Specimens

1961 ◽  
Vol 41 (4) ◽  
pp. 380-384 ◽  
Author(s):  
Arthur F. Dratz ◽  
James C. Coberly
Keyword(s):  
Direct Determination

A New Method for Direct Determination of the Recoilless Fraction with Application to Magnetic Nanoparticles

2002 ◽  
Vol 721 ◽  
Author(s):  
Monica Sorescu
Keyword(s):  
Room Temperature ◽  
Average Particle Size ◽  
Direct Determination ◽  
Average Particle ◽  
Lattice Method ◽  
Recoilless Fraction ◽  
Single Room ◽  
Magnetite Particles ◽  
Physical Mixtures

AbstractWe propose a two-lattice method for direct determination of the recoilless fraction using a single room-temperature transmission Mössbauer measurement. The method is first demonstrated for the case of iron and metallic glass two-foil system and is next generalized for the case of physical mixtures of two powders. We further apply this method to determine the recoilless fraction of hematite and magnetite particles. Finally, we provide direct measurement of the recoilless fraction in nanohematite and nanomagnetite with an average particle size of 19 nm.

Polarographic Determination of 6-β-D-Glucopyranosyloxy-7-hydroxycoumarin

1996 ◽  
Vol 61 (3) ◽  
pp. 333-341
Author(s):  
Jiří Barek ◽  
Roman Hrnčíř ◽  
Josino C. Moreira ◽  
Jiří Zima
Keyword(s):  
Natural Compound ◽  
Mercury Electrode ◽  
Direct Determination ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Whitening Agent ◽  
Polarographic Behaviour ◽  
Pulse Polarography ◽  
Dropping Mercury Electrode

The polarographic behaviour was studied for 6-β-D-glucopyranosyloxy-7-hydroxycoumarin, a natural compound serving as an optical whitening agent. The substance can be quantitated by tast polarography, differential pulse polarography using a conventional dropping mercury electrode, and differential pulse polarography using a static mercury drop electrode over the regions of 20-1 000, 2-1 000, and 0.2-1 000 μmol l-1, respectively. The methods developed for the quantitation of the compound were applied to its direct determination in a raw product.

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