REPOSITORY > RESULTS

Engineered nanofibers and nanoparticles are recognized as capable of inducing cellular perturbations according to the oxidative stress paradigm or by interacting directly with biological membranes. A number of authors in their investigations with the nanofibres and nanoparticles has reported the ability of nanofibers and nanotparticle to cause the different damage …

The main purpose of this thesis is to describe the inhomogeneous phase of a layered system. The phase is the result of the competition between attractive interactions and the long range Coulomb repulsive force (LRCF). In order to achieve this, two different strategies are applied. The first is within the …

Solving real-life optimization problems numerically is often very time demanding, because of high complexity of the simulations that are usually involved. Solving such problems becomes highly impractical for this reason and can even lead to use of less complex and also less accurate models. Fortunately, evolutionary algorithms, often used in …

Over the last decade we have been witnessing rapid development of telecommunication networks and services, in particular in the filed of new wireless network technologies. On different markets users are able to communicate using different wireless technologies. The first two generation of mobile networks (i.e. NMT and GSM) were developed …

Magnetocaloric materials are promising materials for magnetic refrigerators which would substitute present compressor refrigerators. They work on the principle of the magnetocaloric effect (MCE), where the magnetocaloric material increases its temperature when exposed to an external magnetic field. These new type of refrigerators are energetically more efficient and environmentally friendly. …

The theory behind scanning tunneling microscopy and spectroscopy is presented and the basic manipulation techniques are described. Construction details of a low-temperature scanning tunneling microscope for single atom manipulation experiments are given. Single crystal copper (111) and (211) surfaces are studied. Single atom extraction, followed by lateral manipulation procedures is …

In my doctoral dissertation, I primarily devoted my attention to the modifying surface properties of superparamagnetic maghemite nanoparticles. Superparamagnetic maghemite nanoparticles were synthesized using co-precipitation method from an aqueous solution of Fe (II) and Fe (III) ions. The size of the nanoparticles was controlled with aging time at pH = …

The sillenites Bi12MO20 (M = Si, Ge, Ti, Pb, Mn, B1/2P1/2) have been recognised as promising bulk materials for electronic applications because their dielectric properties (5.5 GHz: ε = 37.4 - 41, τf = -19 – (-84) ppm/K, Q x f = 800 - 8100 and Tsin = 680 - …

Interactions between macromolecules are the basic events of life. Their characterization is thus a key to understanding the physiology and the underlying specificity of these events. Not only understanding of the final states (where the molecules get closest together), also understanding of the course of approach is mandatory to gain …

Ion beam sputtering induces morphological as well as compositional changes on the surfaces of ion-sputtered substrates. The surface undergoes kinetic processes, which lead to different morphological details: periodic ripples, substrate-defined etch pits or protuberant structures, roughening and smoothing are some possibilities for surface evolution. The aim of my doctoral dissertation …