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Design of CMOS operational amplifiers
Němec, Tomáš ; Bajer, Arnošt (referee) ; Musil, Vladislav (advisor)
This work deals with issues of design and simulation of analog integrated circuit. The general aim is to design high-speed transconductance differentiating amplifier. The two stage operational – transconductance amplifier with compensation RC element is presented. This compensation method of zero nulling used prevents amplifier from oscillation.
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Bone porcelain based on Calcium Aluminous Cement
Němec, Tomáš ; Nevřivová, Lenka (referee) ; Sokolář, Radomír (advisor)
The Main goal of this bachelor´s thesis is to review qualities of bone china with using of aluminous cement for preparation of porcelain bodies. The theoretical part describes the issue of production of bone china and the use of aluminous cements. Besides that there are shown ways of examining porcelain bodies and description of traditional feldspar porcelain and bone china. In practical part of my thesis I compared final properties and mineralogical composition of the traditional feldspar porcelain, bone china and bone china based on aluminous cement.
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Molecular Simulations of the Vapor–Liquid Phase Interfaces of Pure Water Modeled with the SPC/E and the TIP4P/2005 Molecular Models
Vinš, Václav ; Celný, David ; Planková, Barbora ; Němec, Tomáš ; Duška, Michal ; Hrubý, Jan
In our previous study [Planková et al., EPJWeb. Conf. 92, 02071 (2015)], several molecular simulations of vapor-liquid phase interfaces for pure water were performed using the DL POLY Classic software. The TIP4P/2005 molecular model was successfully used for the modeling of the density profile and the thickness of phase interfaces together with the temperature dependence of the surface tension. In the current study, the extended simple point charge (SPC/E) model for water together with TIP4P/2005 were employed for the investigation of vapor-liquid phase interfaces over a wide temperature range from 250 K to 600 K. Results of the new simulations are in a good agreement with most of the literature data. TIP4P/2005 provides better results for the saturated liquid density with its maximum close to 275 K, while SPC/E predicts slightly better saturated vapor density. Both models give qualitatively correct representation for the surface tension of water.
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Vliv malolaktické fermentace na analytické a senzorické parametry bílých vín
Němec, Tomáš
This thesis deals with the influence of malolactic fermentation on analytical and sensory characteristics of white wines. Literary section addicts oneself to population growth lactic acid bacteria and factors affecting their development in wine, the metabolism of lactic acid bacteria and their products and how these products influence organoleptic properties of white wines. The practical part deals on the experiment of the inoculation of two different species of lactic acid bacteria in wines at different stages of vinification and on the analytical and sensory evaluation of produced wine.
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Prediction of surface tension of binary mixtures with the parachor method
Němec, Tomáš
The parachor method for the estimation of the surface tension of binary mixtures is modified by considering temperature-dependent values of the parachor parameters. The temperature dependence is calcu- lated by a least-squares fit of pure-solvent surface tension data to the binary parachor equation utilizing the Peng-Robinson equation of state for the calculation of equilibrium densities. A very good agreement between experimental binary surface tension data and the predictions of the modified parachor method are found for the case of the mixtures of carbon dioxide and butane, benzene, and cyclohexane, respectively. The surface tension is also predicted for three refrigerant mixtures, i.e. propane, isobutane, and chlorodifluoromethane, with carbon dioxide.
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