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	Je vhodné použít standardní model nukleace v konečných systémech? Kožíšek, Zdeněk ; Demo, Pavel Initial size distribution of nuclei in finite systems plays important role in nucleation process. At low supersaturation our model gives the same results as standard model. At high supersaturation decreases of supersaturation in finite system plays important role and phase transition process differs from standard model. Detailed record
	Výpočet hustotních profilů nano-kapiček použitím gradientní teorie: numerické řešení v transformovaných proměnných Hrubý, Jan The Cahn-Hilliard gradient theory extends the continuum fluid mechanics and thermodynamics to objects of typical dimensions of 1 nm. The present investigation concerns the computation of the density profile of a equilibrium spherical case (droplet, bubble). The solution for this case reduces to a single second-order ordinary differential equation (ODE) with boundary conditions. To overcome computational difficulties due to the tremendous difference of thermodynamic properties of the liquid and vapor phases at low temperatures, we suggest some mathematical transforms. Using these transforms, the right-hand side of the ODE becomes well-behaved and the numerical solution is converging. Detailed record
	Určení parametrů kvantových teček PbCl.sub.2./sub. v matrici NaCl pomoci optické spektroskopie Sveshnikov, Alexey ; Demo, Pavel ; Polák, Karel ; Beitlerová, Alena ; Tichá, Petra ; Kožíšek, Zdeněk Within context of nucleation theory and utilizing optical spectroscopy measurements at various temperatures the basic parameters entering nucleation equation (such as, for example, surface energy, resp. temperature dependent difference in chemical potentials) may be estimated. Detailed record
	Proč se podkritické zárodky rozpadají v nukleujícím systému? Demo, Pavel ; Tichá, Petra ; Sveshnikov, Alexey ; Kožíšek, Zdeněk We show that if the clusters flux density of nucleating system is interpreted in the sense of Onsager's nonequilibrium thermodynamics, the clusters being smaller than the so-called critical nucleus grow with negative velocity and, thus, they must dissolve in nucleating system. Detailed record
	Design of experimental device for measurement of surface tension of supercooled water Richtr, Karel ; Hrubý, Jan ; Mareš, R. This paper is focused on the design of device developed specially for measurement of surface tension of metastable ordinary water. Paper consists of basic knowledge of surface tension in the area bellow 0°C and its importance in condensation models. Next parts of paper deal with construction and function of single components used in the experiment. Detailed record
	Přechodové teplotní pole v komoře pro měření povrchového napětí podchlazených kapalin Hrubý, Jan ; Müller, M. ; Richtr, K. ; Mareš, R. Results of mathematical modeling of the transient temperature field in a new chamber developed to measure surface tension of supercooled liquids are presented. The chamber is designed to enable a very fast (within 0.1 s) formation of a homogeneous temperature field (within 0.02 K) after a temperature jump of 60 K. The interior of the chamber of dimensions 20x16x32 mm is filled with dry nitrogen surrounding the measuring capillary and thermometers (very fine thermocouples and RTD’s). The temperature jump is generated by switching the flow direction of the nitrogen serving as a heat transmitting fluid. To reduce the thermal boundary layer near the bottom and ceiling walls, they are made permeable and some gas is sucked out. The flow in the chamber is laminar. We compute the temperature field analytically and numerically, using the commercial software Fluent. The results indicate that the design objectives of the experimental device were met. Detailed record
	Homogenní nukleační rychlost v uzavřeném systému při různých počátečních podmínkách Kožíšek, Zdeněk ; Demo, Pavel ; Sveshnikov, Alexey Nucleation kinetics in a closed system is studied. At lower supersaturations time dependence of nucleation rate has very similar behaviour as in standard nucleation model. At higher supersaturations nucleation rate reaches some extremal value and then decreases with time. Detailed record
	Povrchové napětí čisté vody Richtr, K. ; Hrubý, Jan ; Mareš, M. The problem of surface tension of supercood water is briefly reviewed. A device is described, developed for measurements of the surface tension of supercooled water. Some preliminary experimental data are given and compared with IAPWS values. Detailed record
	Apparatus Design for Small Volume of Liquid Surface Tension Measurement Hošek, Jan ; Studenovský, K. The work deals with evaliaton of condition for measurement of surface tension of liquid in capilary by Furgeson mehtod. On the bases of theoretical discussion was developed a new method of measurement of surface flatness of very small dimension. Detailed record

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