Calculation of partial molar volume changes at high pressures

Structural changes in thermoelectric SnSe at high pressures.

The crystal structure of the thermoelectric material tin selenide has been investigated with angle-dispersive synchrotron x-ray powder diffraction under hydrostatic pressure up to 27 GPa. With increasing pressure, a continuous evolution of the crystal structure from the GeS type to the higher-symmetry TlI type was observed, with a critical pressure of 10.5(3) GPa. The orthorhombic high-pressure...

Adsorption at High Pressures

Calculation of the partial volume of organic compounds and polymers

A novel, universal and easy-to-use approach is presented which allows the ab initio calculation of partial volumes of organic compounds, valid for aqueous solutions at 25 °C. The method is based on Traube's additivity principle and concept of volume increments for atoms. His concept, however, was improved considerably by manifold adaptations, corrections, and completions. Major improvements wer...

Plasma interferometry at high pressures

A general formulation for the measurement of plasma density and effective collision frequency for lowly as well as highly, collisional plasmas using millimeter wave interferometry is presented. In the presence of high density and collisionality at high gas pressures where the collision frequency ~n! is of the order of both the plasma (vp) and the wave frequency of the millimeter wave ~v! (n ;v ...

CALCULATION OF RESIDUAL VOLUME BY SPIROMETRIC DATA

 ABSTRACT Background: The current practice to measure RV is either by BPG or helium dilution methods which may not be available in all clinics due to their cost. Methods: This paper outlines a method for both direct and indirect calculation of RV via PFT with acceptable sensitivity (81 %, 60% ), specificity (71 %, 94%) and validity (76%, 78%) for obstructive and restrictive lung disease respect...