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Lead Free Solder Joint - Models for Reliability Prediction
Nestrojil, Michal ; Šandera, Josef (referee) ; Starý, Jiří (advisor)
This bachelor's thesis deals with reliability prediction of lead-free solder joint. Background research of fatigue models for lead free solder joint.is described in theoretic part Basic terminology and lead free soldering technology operations are mentioned in the theoretical part too. The practical part is dealing with observation of resistivity and solder joint strength during thermal cycling. Evaluation of results and experiments and posibility for future application of these results for fatigue model realisation is discussed in the end of this bachelor's thesis
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Study of electric properties of composite
Bariš, Marián ; Havlíček, Svatopluk (referee) ; Polsterová, Helena (advisor)
The theme of this Bachelor's thesis is a problematics of composite materials. On a given samples of polyamide with a various weight filling of a milled mica were measured resistivity, permittivity and loss factor on a consequence of a temperature and filling. The chosen type was a filling with a milled mica in range from 0 to 40 of a weight percentage, temperatures were in range from 20 °C to 90 °C.
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Study of electric properties of composite
Bariš, Marián ; Havlíček, Svatopluk (referee) ; Polsterová, Helena (advisor)
The theme of this Bachelor's thesis is a problematics of composite materials. On a given samples of polyamide with a various weight filling of a milled mica were measured resistivity, permittivity and loss factor on a consequence of a temperature and filling. The chosen type was a filling with a milled mica in range from 0 to 40 of a weight percentage, temperatures were in range from 20 °C to 90 °C.
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Study of electric properties of nanocomposites
Libra, Miroslav ; Rozsívalová, Zdenka (referee) ; Polsterová, Helena (advisor)
The present master´s thesis deals with the electrical properties of nanocomposite materials. Samples for the experiment are made epoxi resin and oxides TiO2 and Al2O3 as nanofillers in different percent performace. The samples nanocomposites are measured temperature dependence of the resistivity inside, dissipation factor and relative permittivity. It discusses the effect of the filler on the resulting electrical properties of the polymer.
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Dielectric absorption characteristics of stressed slot insulations
Přikryl, Tomáš ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
Master's thesis is monitoring changes in basic dielectric properties. Monitoring changes in absorbency of characteristics and temporal dependences in rezistance with change of relative humidity. On the colection samples were measured temporal dependences charged and uncharged currents in ambient temperature and 0%, 55%, 75%, 95% relative humidity. The next part of my work is monitoring temporal dependences interior rezistance in the time of ageing in different humidities. Experiments were made on material ISONOM NKN and NMN.
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Modification of electroinsulating varnish with ground mica
Drápal, Aleš ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
This master's thesis focuses on composite systems based on varnish combined with different filler ratios of micronized mica. The aim is to analyse impact of the filler on dielectric properties of the varnish, i.e. relative permittivity and loss factor as functions of frequency as well as charging and discharging currents as functions of time. Dielectric mixture formulas are applied on relative permittivity values. Calculated and measured values are compared.
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Tissue impedance measurement
Nejezchleba, Zdeněk ; Rampl, Ivan (referee) ; Chmelař, Milan (advisor)
Bachelor thesis deals with the measurement of resistance of the skin with direct current. It describes the changes in the value of time, depending on the emotional stability of the human and his psychological habit. It is a method able describe the relatively objectively and compare human emotions.
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Elektrická rezistivita podstechiometrického TiO2 vyrobeného plazmovým nástřikem
Ctibor, Pavel ; Sedláček, J. ; Neufuss, Karel
The work is concentrated on electric resistivity of plasma sprayed titania TiO2. Synthetic conventional TiO2 powder and powder prepared by agglomeration of nanopowder particles were sprayed and measured. Spraying was carried out using the water-stabilized plasma system (WSP®) and resistivity measurement was applied on TiO2 layers detached from the substrate. Variations in basic spray conditions – spray distance, feedindg distance and substrate preheating temperature were commented from the point of view of their influence on electric resistivity.
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Assessment of the sensor temperature in HWA
Antoš, Pavel
One of the key parameters in hot-wire anemometry is the temperature of the sensor. The temperature is set on CTA via the resistivity of the hot sensor. Several probes were tested using a variable temperature oil bath. Dependence of the resistivity on the temperature and means of its estimation are the subjects of the paper.
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Elektrická rezistivita podstechiometrického TiO2 vyrobeného plazmovým nástřikem
Ctibor, Pavel ; Sedláček, J. ; Neufuss, Karel
The work is concentrated on electric resistivity of plasma sprayed titania TiO2. Synthetic conventional TiO2 powder and powder prepared by agglomeration of nanopowder particles were sprayed and measured. Spraying was carried out using the water-stabilized plasma system (WSP®) and resistivity measurement was applied on TiO2 layers detached from the substrate. Variations in basic spray conditions – spray distance, feedindg distance and substrate preheating temperature were commented from the point of view of their influence on electric resistivity.
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