National Repository of Grey Literature 17 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
The issue of evaluating of interlocking in substations using GOOSE messages
Ditrych, Marek ; Fíla, Vlastimil (referee) ; Orságová, Jaroslava (advisor)
This master thesis focuses on problematics of GOOSE messages used for evaluation of blocking conditions of substations in the electrical power plant in Opatovice (EOP). Firstly, the thesis describes the multifunctional electrical protection relay 7SJ64 as well as GOOSE messages, that are run by protocol IEC 61850. Next, it contains a brief description of the energy consumption of EOP itself, since the project was written for its protection relays. In the practical part of the thesis, an experimental network consisting of two distinct substations with three 7SJ64 multifunctional protection relays was designed together with simple blocking conditions. These require information about the state of circuit breakers. The whole communication is carried by GOOSE messages. Moreover, to inform about the loss of GOOSE messages, the logical function SI_GET_S (decoder) was used inside the coding interface of DIGSI programme called CFC. This function was then tested in the experimental network using each different condition, that experienced interruptions of communication caused either by simulated defect of optical cabels, or by „user‘s mistakes“ in the settings of communication parameters in DIGSI. Finally, the system protecting from the loss of GOOSE messages was incorporated into the existing project evaluating blocking conditions in the block substation of EOP.
Economics of Health of University Students
Fila, Vít ; Blahutková, Marie (referee) ; Lepková, Hana (advisor)
Bachelor thesis: „Economics of health of university students“ addresses the issue of current health and lifestyle of university students from the perspective of health economics. Through the questionnaire, both collected information about lifestyle, health status and relation to health. There are also monitored financial costs associated with the students' health and prevention. The design of the elaborated recommendations for improving the relationship university students to health from the perspective of health economics.
Financial Analysis of a Sports Club - Zbrojovka Brno
Fila, Vít ; Hornungová, Jana (referee) ; Luňáček, Jiří (advisor)
Bachelor thesis: „Financial analysis of a sports club – Zbrojovka Brno“ is divided into four parts. In first part shows theoretical basis for solving practical part. The second part describing club Zbrojovka Brno. The third part is a part analytic, which shows the current state in which the club is located. In the last part are presented proposals to improve the situation.
Time Alignment of PA System
Středa, Jan ; PINKAS, Martin (advisor) ; FILA, Vladimír (referee)
This thesis deals with the time-unification of sound emitted by sound system (PA system) and the direct sound of musical instruments or the human voice reaching to the audience from the stage. They demonstrate practical ways of measuring delay and time alignment settings. The paper explains the basic division of PA systems and the distribution of types sounding. The following is a principle of sound localization and temporal threshold of human hearing. One chapter includes the results of the practical test investigating the subjective qualities time alignment signal and not aligned one and tolerance for the accuracy of the delay.
Effects of thermal crosslinking treatment on gas separation performance and stability of polymeric membranes
Martin-Gil, V. ; Hrabánek, Pavel ; Sysel, P. ; Fíla, V.
In this work, (4,4’-Hexafluoroisopropylidene) diphthalic anhydride (6FDA), 2,4,6- trimethyl-1,3-diaminobenzene (DAM) and 3,5-diaminobenzoic acid (DABA) were used to synthesize copolyimides with different ratios of DAM:DABA (2:1 and 9:1) as well as polyimide 6FDA-DAM in order to check the influence of acidic group from DABA in the membrane formation process as well as in the crosslinking treatment. The main aim of crosslinking treatment is to improve the CO 2 induced plasticization resistance of the membrane. Copolyimides were synthesized using two steps reaction: (i) synthesis of polyamic acid (PAA) and (ii) thermal imidization in solution. The obtained crosslinked membranes presented solvent resistance due to the transesterification of the polymer. Furthermore, it could be observed that the crosslinked membranes showed higher permeabilities for small gases (He and H 2 ) and for bigger gases (CO 2 and CH 4 ) permeabilities decreased slightly. It can be due to the densification of the membrane during the thermal treatment. However, this treatment presents highly promising results for H 2 recovery in syngas production or extraction of hydrogen from petroleum naphtha cracking streams
Development of silane modified TS-1 nanoparticles as fillers for Mixed Matrix Membranes (MMM’s)
Martin-Gil, V. ; Lhotka, M. ; Hrabánek, Pavel ; Fíla, V.
In this work, Titanium Silicalite 1 (TS-1) was synthesized using different crystallization temperature (Tc = 180 °C, 160°C, 140°C), aging time (t aging = 1, 2, 3 and 7 days) and aging temperature (T aging = T room , 40 °C, 80°C) in order to get suitable nanoparticle size and good distribution of particle size for using them as a filler in MMMs. The TS-1 particles with different Si/Ti ratios (Si/Ti = 25 and 100) were functionalized using different amino silane coupling agents: 3-aminopropyltriethoxysilane (APTES), 3- aminopropyltrimethoxysilane (APTMS) and 3-aminopropylmethyldiethoxysilane (APMDES). Moreover, a new kind of silane coupling agents: 3- glycidoxypropyltriethoxysilane (GPTES), 3-glycidoxypropyltrimethoxysilane (GPTMS) and 3-glycidoxymethyldiethoxysilane (GPMDES) were also used. Tetrahydrofuran (THF), with a high dielectric constant (7.6), was used as solvent in order to control the surface modification and avoid pore blockage. The samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier Transform Infrared spectroscopy (FTIR), as well as carbon dioxide methane and nitrogen adsorption measurements. The obtained results showed that aging temperature at long aging times have the main effect on the morphology of the particles meanwhile crystallization temperature influences gas adsorption properties. T aging higher than T room showed a great influence on the particle size at t aging = 7 days; shorter t aging did not show an observable influence on the particle size. Crystallization temperature influences the adsorption properties; at lower crystallization temperature, higher quantity of CO 2 adsorbed and lower quantity of CH 4 adsorbed. At last, suitable TS-1 filler with good size distribution and particle size about 200nm was obtained using Si/Ti = 100 and Si/Ti = 25, T c = 140 °C, T aging = 40 °C and t aging = 7 days.
Polyimide based membranes for gas separation
Martin-Gil, V. ; Sysel, P. ; Hrabánek, Pavel ; Fíla, V.
The 6FDA-DAM:DABA membranes with different ratio DAM:DABA have been successfully prepared and tested in single gas permeation. The crosslinked membrane prepared by thermal treatment present highly promissing results for H2 recovery in syngas production, extraction of hydrogen from petroleum naphtha cracking streams or other chemical processes where the hydrogen as by product is generated.
Process-Based Model of Mixed-Matrix Membrane
Čapek, P. ; Hejtmánek, Vladimír ; Veselý, M. ; Sysel, P. ; Kočiřík, Milan ; Brabec, Libor ; Zikánová, Arlette ; Bernauer, B. ; Fíla, V.
The focus of this contribution was on the formulation and verification of a process-based model of the mixed-matrix membrane that consisted of the polyimide matrix synthesized from the monomers 4,4’-(hexafluoroisopropylidene)diphtalic anhydride and 4,4’-oxydianiline, and silicalite-1. When a solution of a polyimide precursor in N,N-dimethylformamide was ready, silicalite-1 particles were dispersed in the solution and the dispersion was subsequently cast on a Teflon support plate. An initial mass ratio of silicalite-1 and polyimide was about 1:1. After solvent removal, the films were heated in subsequent steps up to 230°C for two hour. From a process-based model point of view, a key operation of the entire synthesis was slow sedimentation of silicalite particles in the viscous solution. Preliminary observation of 2D cuts through the solid membrane in a scanning electron microscope revealed that there were a lot of contacts among the silicalite particles. Therefore, a sequential (ballistic) deposition algorithm, well representing sedimentation in a low-energy environment, was used to create an off-lattice model of spatial distribution of the silicalite particles in the polyimide matrix.
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Gases separation properties of titanium substituted MFI zeolite membrane
Cong, D. T. ; Fíla, V. ; Novotná, J. ; Hrabánek, Pavel ; Bernauer, B.
Zeolite membranes have the potential to separate gaseous mixtures such as CO2/CH4 and butane isomers, which are important in energy saving respects [1], [2] due to zeolite microporous internal pore structure. They have the additional advantage of with-standing high temperature and harsh chemical environments [3].

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See also: similar author names
1 Fila, Vladislav
2 Fila, Vít
1 Fíla, V.
1 Fíla, Václav
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