National Repository of Grey Literature 61 records found  beginprevious42 - 51next  jump to record: Search took 0.01 seconds. 
Experimentální studie rovnováhy kapalina-pára v binárních směsích oxid uhličitý + alifatický alkohol (methanol, ethanol, 1-propanol, 2-propanol)
Babič, Alexandr ; Aim, Karel
Experimental data are correlated with cubic equation of state with vdW and GE mixing rules. Model parameters are adjusted by minimization of objective function defined by maximum likelihood method for data with normal distribution function errors. Data are compared to existing data sets at temperatures 30, 50, 60 °C.
Teplotní závislost dodatkových molárních objemů v systémech oktan-aromatické uhlovodíky
Linek, Jan ; Morávková, Lenka
Densities of binary liquid mixtures of octane-benzene, -toluene, -m-xylene and -1,3,5-trimethylbenzene have been measured at 298.15, 308.15, and 328.15 K and atmospheric pressure by a vibrating-tube densimeter.
Teplotní závislost dodatkových molárních objemů v systémech oktan-aromatické uhlovodíky
Linek, Jan ; Morávková, Lenka ; Wagner, Zdeněk
Densities were measured for the liquid benzene and 1,3,5-trimethylbenzene, and for nine their mixtures at four temperatures between 298.15 K and 328.15 K and at pressures up to 40 MPa. An apparatus for density measurements of liquid and liquid mixtures whose main part is a high-pressure vibrating-tube densimeter working in a static mode was used for the measurement. The density data were fitted to the Tait equation and the isothermal compressibilities were calculated with the aid of this equation. Excess molar volumes were also calculated from the densities and fitted to the Redlich-Kister equation.
Vztah mezi kapilárním tlakem a permeabilitou studovaný pomocí modelu trojrozměrné sítě pórů
Čapek, P. ; Hejtmánek, Vladimír
The results of this study clearly indicate that, in the network representation of a porous medium, the cross-sectional shape of throuds, the chamber-to throut aspect ratio, and spatial correlations between chambers and adjacent throats have the significant unfluence on permeability and mercury-air displacement. Since the critical capillary pressure is solely determined by the throat size and shape in this study, the chamber-to throat aspect ratio is the only pore structure parameter, which does not have any influence on the capillary pressure curves at all
Selektivita mokré oxidace v periodicky řízeném zkrápěném reaktoru
Tukač, V. ; Chyba, V. ; Hanika, Jiří
The objective of this work was to investigate the impact of dynamically changing extent of wetted catalyst surface and mass-transfer of gaseous oxygen on oxidation of the aqueous phenol under periodic modulated liquid feed rate. Selectivity of oxidation and reactor productivity was also under consideration in this study.
Efektivní transportní vlastnosti rekonstruovaného porézního katalytického nosiče
Salejová, G. ; Kosek, J. ; Nevoral, V. ; Šolcová, Olga ; Schneider, Petr
Comparative studies critically evaluating the applicability of the concept of 3D reconstructed porous media against experimental data are scarce in the field of heterogeneous catalysis. The limitations of the current state-of-the-art reconstruction techniques for porous media with "broad" pore size distributors are also discussed
Určení transportních charakteristik z protiproudé difuze plynů
Soukup, Karel ; Šolcová, Olga ; Schneider, Petr
Two types of a diffusion cell commonly used for studying of isobaric counter-current diffusion in porous solids are compared. Both cells enable determination of diffusion coefficients and transport characteristics of porous materials. Transport parameters are material constants of the porous solids and can be evaluated through application of a suitable model of porous solids to results of measurements of transport processes withing the porous structure
Axiální disperse v SPSR koloně nestandardně tvarovaných částic
Šolcová, Olga ; Soukup, Karel ; Schneider, Petr
It was shown that it is possible to block all pores pellet by a siutable liquid. Profil was chosen as suitable because of its viscosity and very low vapor tense. Porous pellet with blocked pores behave as non-porous during SPSC column response measurements. This creates the possibility to determine axial despersion characteristics of unusually shaped pellet
Distribuce porů z permporometrických měření
Šolcová, Olga ; Schneider, Petr
Two measurement modes for obtaining wet-curves were suggested and verified. In the figure the obtained wet and dry curves for two catalysts are shown. It was verified that LEPP gives consistent pore size distribution of flow-through pores and, thus, should be tried as the standard texture characteristic suitable for prediction and/or simulation of gas flow in porous media

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