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Vapor–Liquid Equilibrium in Diluted Polymer + Toluene Systems
Bogdanić, Grozdana ; Wichterle, Ivan
Vapor–liquid equilibrium data were determined for five polymer plus toluene systems at isothermal conditions between 60 and 100 oC. Polymers comprise copolymers and terpolymers of octadecyl acrylate, acrylic acid, styrene, and 1-vinyl-2-pyrrolidone because of their practical importance as flow improvers for crude oil and/or derivatives. All-glass micro-ebulliometer with circulation of liquid phase was used for measurement of total pressure over polymer + toluene mixtures. Two predictive group contribution models (the Entropic–Free Volume and the Group Contribution–Flory) were applied to estimate phase behavior of two polymer solutions; good agreement with experimental data was achieved.
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Identifikace tuhosti a tlumení aerostatických ložisek
Kozánek, Jan ; Šimek, J. ; Steinbauer, P. ; Bílkovský, A.
Paper is a final part of work on subject of dynamic properties identification of aerostatic journal bearings with use of Rotor Kit Bently Nevada, started in 2006. Different bearing types were experimentally investigated and their static and dynamic characteristics were identified. More sophisticated methods of identification were used and spectral and modal properties were calculated. Computer program was revised on the basis of experimental data. The influence of non-diagonal stiffness and damping elements was investigated by numeric simulation.
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Pokroky v popisu termodynamických vlastností soustav obsahujících alkanoly
Aim, Karel ; Nezbeda, Ivo
Two lines of research dealing with the applications of the so called primitive models (of association) to describe the thermodynamic properties of alkanolic systems will be outlined, namely (i) molecular simulations for the water and methanol mixtures, and (ii) equation of state developments for the alkanol and carbon dioxide systems. Molecular simulations on water–methanol mixtures were performed by using primitive models that descend from realistic models of molecular interaction for both compounds. The results for both the excess mixing and partial molar properties of the system over the entire concentration range were compared with the molecular simulation results for the commonly accepted complex realistic models (effective pair-wise potentials) and with experimental data.
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Scanning and saving graphic date
Dobiáš, Jan
Important experiences about graphic data scanning, processing and savin are discussed. The optimal approach to mass experimental graphic data processing and graphic document filling and retrieval is presented.
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