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Heterogeneous nucleation of iron oxide (γ-Fe2O3) in colloidal systems

Author(s): Darinka Primc (Author), Darja Lisjak (Supervisor)

Year: 2013

Type: Doctoral dissertation

Presented work is a study of magnetic iron oxide (referred to as spinel) coating synthesis. The coatings were synthesized on the surfaces of selected core nanoparticles with heterogeneous nucleation during the co-precipitation of the Fe3+/Fe2+ ions. The work is divided into three parts. The first part comprise the synthesis of …

A Machine Learning Approach to Polynomial Regression

Author(s): Aleksandar Pečkov (Author), Sašo Džeroski (Supervisor), Ljupčo Todorovski (Co-Supervisor)

Year: 2012

Type: Doctoral dissertation

In the thesis, we address the task of polynomial regression, i.e., inducing regression models based on polynomial equations, from data. We aim at improving and extending the existing approaches to learning polynomial regression models in several directions. First, we improve the existing methods for addressing the issue of over-fitting and …

An Evaluation Method for Feature Rankings

Author(s): Ivica Slavkov (Author), Sašo Džeroski (Supervisor)

Year: 2012

Type: Doctoral dissertation

Feature ranking is the machine learning task of inducing an ordering of features in a given dataset according to some notion of relevance. We consider the feature ranking task in the context of supervised learning, where the notion of feature relevance is defined with respect to a target concept. Feature …

Determination of steroid estrogens in environmental samples using chemical analysis (GC-MSD) and an in vitro estrogenicity assay (ER-Calux®)

Author(s): Miha Avberšek (Author), Ester Heath (Supervisor), Janez Ščančar (Co-Supervisor)

Year: 2012

Type: Doctoral dissertation

The presence of steroid estrogens in the environment has been studied intensively for two decades because of their possible deleterious effects on living organisms at very low (ng/L) concentrations. To determine concentrations of steroid estrogens and the estrogenic potential of environmental samples, sophisticated and sensitive analytical techniques as well as …

Optimization of coupling between high-frequency generator and low pressure plasma

Author(s): Rok Zaplotnik (Author), Miran Mozetič (Supervisor), Alenka Vesel (Co-Supervisor)

Year: 2012

Type: Doctoral dissertation

In this thesis we present the development of the device for the removal of carbon deposits in fusion reactors. Amorphous hydrogenated carbon deposits (a-C:H) represent a major problem for smooth operation of future fusion reactors with divertors containing carbon tiles, because they cause retention of radioactive tritium. There are techniques …

Parameter Identification in Nonlinear Dynamic Systems with Meta-heuristic Approaches

Author(s): Katerina Tashkova (Author), Sašo Džeroski (Supervisor), Jurij Šilc (Co-Supervisor)

Year: 2012

Type: Doctoral dissertation

The task of mathematical modeling of dynamic systems from observed system behavior, widely known under the name of system identification, breaks down into two subtasks. The first task, referred to as structure identification, is to specify the model structure, i.e., the functional form of the model. In practice, the model …

Development of silicon carbide based implants with improved biocompatibility and mechanical properties

Author(s): Katarina Rade (Author), Saša Novak Krmpotič (Supervisor), Spomenka Kobe (Co-Supervisor)

Year: 2012

Type: Doctoral dissertation

With emerging need for orthopaedic implants and prolonged exposure of organism to implants also problems connected to elution of metal ions that in some cases cause adverse reactions in the human body, emerge. The main aim of our work was therefore to investigate the potential of silicon carbide (SiC) to …

Magnetically oriented films of barium ferrite

Author(s): Simona Ovtar (Author), Darja Lisjak (Supervisor)

Year: 2012

Type: Doctoral dissertation

This work had three aims. In the first part the influences of the sizes of the particles of barium ferrite (BaM) and their magnetic properties on the stability of the suspension were investigated. In second part the deposits were prepared by electrophoretic deposition (EFN) and the influence of particle size, …

Development of new anti-bioadhesive surfaces for specific neurodegenerative agents

Author(s): Tjaša Vrlinič (Author), Miran Mozetič (Supervisor), Fabienne Poncin-Epaillard (Co-Supervisor)

Year: 2011

Type: Doctoral dissertation

The research work presented in this thesis considers the development of new biocompatible surfaces that are able to control the adhesion of specific proteins responsible for the development of neurodegenerative diseases such as Creutzfeldt–Jakob, Alzheimer, Parkinson and Lewis body disease. Our approach was focused on problems prior to the detection …

Ontology Extension Using Text Mining for News Analysis

Author(s): Inna Novalija (Author), Dunja Mladenić (Supervisor)

Year: 2011

Type: Doctoral dissertation

In computer science, ontologies enable formalized knowledge representation. The goal of ontology extension is to correctly augment the existing ontology with new formalized knowledge (e.g., concepts, relationships etc.). This thesis addresses the ontology extension process based on text mining methods. News analysis is the application of the extended ontology. A …