Search Results (280)
Investigations and separation of various contributions to dielectric response of advanced ceramic and polymeric materials
Dielectric materials, used to control and store charges and electric energy, play a key role in modern electronics and electric power systems. Dielectric spectroscopy is a versatile method, well-suited for detection, separation and characterization of various contributions to dielectric response of advanced ceramic and polymeric materials, as it enables understanding …
Knowledge discovery in a service-oriented data mining environment
The thesis addresses the development of novel knowledge discovery scenarios in a modern data mining platform by utilising principles of service-oriented architecture with web services, interactive scientific workflows, knowledge discovery ontologies and automated construction of data mining workflows. We present the developed Orange4WS platform which upgrades Orange, a mature open-source …
Study of polar ordering in ordered and partial disordered ferroelectric systems
This work presents experimental studies of ordering phenomena, electromechanical and electrocaloric properties in single crystal, ceramic and solid solution relaxor ferroelectrics and single crystal ferroelectric materials. The main aim of investigations is to prove the existence of a liquid-vapor critical point in these systems and to verify its impact on …
Radon as a tool in geophysical research
Radon (222Rn, half-life 3.82 days) is a natural radioactive noble gas which originates from the radioactive decay of radium (226Ra) in the Earth's crust. It is a known hazard to humans, due to its radioactivity. Moreover, radon can also be used as a versatile tool in geophysical research. In order …
Effect of coupling between external factors and building materials' properties on living conditions deterioration in low-energy buildings
Buildings are complex systems as external factors are linked to, and have an effect on the characteristics of a building. In this dissertation, the focus is on the connection between external factors and the building’s characteristics, which have an impact on the living conditions, durability and energy efficiency of a …
Considering autocorrelation in predictive models
Most machine learning, data mining and statistical methods rely on the assumption that the analyzed data are independent and identically distributed (i.i.d.). More specifically, the individual examples included in the training data are assumed to be drawn independently from each other from the same probability distribution. However, cases where this …
Normobaric hypoxia: Metabolic responses following 10-day hypoxic confinement
The aim of the present thesis was to examine the effect of normobaric hypoxic confinement on selected metabolic responses. This was investigated in two separate studies: Study I investigated the effect of normobaric hypoxia, as frequently used by athletes for altitude training, on metabolism. The metabolic responses were assessed in …
Development of coatings on Ti6Al4V alloy for new generation bone implants with improved osseointegration
The aging of bone tissue, bone defects that form during the removal of cysts, tumours, genetic defects and other bone‐tissue‐related diseases, together with demands for a better quality of life, mean a requirement for materials, artificial or autogenous, that will have a long functionality and survivability under the body’s environmental …
Investigation of heterogeneous reactions of trifluoromethane with some metal oxides, hydroxides and carbonates
Heterogeneous reactions of trifluoromethane CHF3 with solid xerogel oxides, alkali hydroxides and carbonates were investigated under static and dynamic conditions and at moderate temperatures. In all cases, main reaction is fluorination characterised by a complete decomposition (mineralisation) of the fluorinating agent, CHF3, and the formation of the solid metal fluorides. …
Laser Ablation - Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS) - Fundamental Study of Ablation and Deposition Processes
Laser ablation (LA) is a versatile technique that can be used for the elemental analysis of diverse materials as well as for synthesis purposes, i.e. for pulsed laser deposition (PLD) of a wide range of materials. Analysis and synthesis will only be successful if the ablated material can be stoichiometrically …