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Assessment of the design of the new solution sliding contact in electrical machines
Záhejský, Petr ; Mach, Martin (referee) ; Veselka, František (advisor)
The thesis is devoted to assessing the concept of a new solution to the sliding contact in electrical machines. The work is focused mainly on the issue of collector engines, which are almost exclusively used in electric hand tools. Much of the work is devoted to angle grinders, which are usually used in extreme conditions and demands for seamless operation are enormous. In order partial insight into the problems in the introduction are studied phenomena acting on the sliding contact, wear and durability. Then further materials and diagnostic methods for increasing the transfer efficiency brush - commutator brush - ring. The following sections of this thesis is also considered a proposal innovated brush along with the practical verification and evaluation of the suitability of the use of innovative sliding contact.
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Separation of solid particles from biomass burning
Štěpánek, Petr ; Baláš, Marek (referee) ; Pospíšil, Jiří (advisor)
This thesis deals with aspects of the dust particles which occur in gaseous products from biomass combustion. The thesis introduces technologies by which solid particles capture from a combustion flow can be implemented. Principles and technical means of dust particles separation in mechanical separators are put in focus primarily. The thesis is concluded with a technical design of a cyclone separator.
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Effect of Dust on Properties of Collagen Materials.
Součková, M. ; Mašková, Ludmila ; Smolík, Jiří
Samples of collagen materials were exposed to dust for two years in depositories, but the total deposition of particles was very small (approx. 0.1 weight percent). For this reason to another samples of collagen materials were dust particles applied using a bag from nonwoven textile. After the artificial ageing of samples the dust was removed mechanically and properties of collagen materials were investigated.\n\n
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22015121815120 - PDF
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The Effect of Dust Particles on Cellulose Degradation.
Bartl, B. ; Mašková, Ludmila ; Paulusová, H. ; Smolík, Jiří ; Bartlová, L. ; Vodička, Petr
This study focused on the changes in properties of cellulose-based paper Whatman 41, which can take place as a consequence of its contamination by dust particles. The chemical composition and size distribution of dust particles from archival repositories were analysed. After the artificial ageing, the viscosity-average degree of polymerization of cellulose DPv was measured. It was confirmed that cellulose-based paper can undergo substantial changes when contaminated by dust particles and artificially aged. The decrease of the DPv of cellulose showed a negative correlation with the deposited mass of sulfate ions in the dust particles. Considering the particle size fraction, the results suggest the decisive importance of the fine (PM1) particles. \n\n
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22015120714361 - PDF
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Methodology of Selection of Means for Mechanical Cleaning of Dust Particles from Paper Surface
Benešová, M. ; Mašková, Ludmila
The aim of this work was to identify methods of mechanical cleaning of dust particles from the paper surface, which are suitable for use in the restoration practice. For this purpose 15 methods of mechanical cleaning were tested. The basic requirement was the applicability of the methodology for the most restorers. Therefore the methodology included only approaches which do not require any special equipment. The results showed that the type of paper has no effect to cleaning results and the main criterion for selection of means of treatment is the extent of soiling.
Fulltext: content.csg - PDF
Plný tet: Metodika-mechanické čištění - PDF
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Analysis of the mass concentration of airborne dust in the road transport depending on traffic environment
KLÍMA, David
The name of this bachelor thesis : Analysis of the mass concentration of airborne dust in the road transport depending on traffic environment deals with measurement of mass concentration of airborne dust i places, which differed both in the amount of traffic and resources in the size of dust particles. Measurement were obtained objective information about influence of different categories of moving vehicles in road transport on air pollution by emissions from non-combustion processes.
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Analysis of the mass concentration of airborne dust in the road transport depending on traffic environment.
SKALIČKA, Jiří
The goal of my thesis is to measure the mass concentration of airborne dust in the road traffic, in relation to the nature of the traffic environment and transport routes. The paper provides an overview of the measured values from the individual measuring points, which differed in the intensity of traffic and the size of dust sources. Objective information are obtained with the measurements, about the actual impact of air pollution by emissions from non-combustion processes, on the movement of vehicles in road traffic.
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