Search Results (94)
Test Infrastructure Design for ADC Cores in System-on-Chip
With the advent of System-on-Chip (SoC), intense research efforts are being carried out in order to find efficient practical solutions for testing deeply embedded, mixed-signal cores. Due to restricted access, a built-in self-test (BIST) of mixed-signal cores is in many cases a preferred alternative to a conventional test using external …
Colloidal Interactions and Novel Colloidal Structures in Thin Nematic Layers
The thesis presents experimental studies of colloidal interactions and novel colloidal structures in confined nematic liquid crystal using optical tweezers. Liquid crystal colloids are a novel class of composite materials with well-controlled periodic structures in the nanometer and micrometer ranges. Moreover, they also posses novel mechanical, optical and rheological properties, …
Selenocompounds in selenium-enriched plants determined by spectrometric methods
Selenium (Se) has been demonstrated to be an essential trace element for maintenance of animal and human health. Se is incorporated into proteins to make selenoproteins, which are important antioxidant enzymes. The antioxidant properties of selenoproteins help to prevent cellular damage caused by radicals. Radicals are natural by-products of oxygen …
Structural and electrical properties of 0.65PMN-0.35PT thick films on different substrates
A starting powder with the nominal composition 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 (0.65PMN–0.35PT), which corresponds to the morphotropic phase boundary (MPB) composition, was prepared by mechanochemical activation followed by attritor milling and low-temperature calcination at 700°C. It had a narrow particle size distribution with the median particle size equal to 0.3 μm. From the …
Occurrence, fate and removal of pharmaceutical residues in water treatment
The presence of pharmaceutical residues in surface waters is an emerging environmental issue that provides a new challenge to treatment systems for potable water, wastewater and water reuse. Their principle pathways into the sewerage system are twofold: first, after being administered to patients they are normally excreted as various metabolites …
Assessment of behavioural thermoregulation in humans: with particular reference to mild narcosis and prolonged bed rest
Behavioural responses are the most efficient thermoregulatory responses, since relatively simple actions can prevent the need to activate the more metabolically costly autonomic responses. Dependence on behavioural responses may increase in environmental conditions where the prevailing nonthermal factors (NTF) attenuate autonomic responses and alter thermal perception (Mekjavic et al., 2003; …
Hydrogen absorption in Ti-Zr-Ni alloys
Our research focused on the formation of Ti40Zr40-xNi20Cux (x=3, 5), Ti45Zr38-xNi17Cux (x=3, 5), Ti53Zr27-xNi20Cux (x=3, 5) and Ti58Zr24-xNi18Cux (x=3, 5) icosahedral (i-phase) quasicrystals by three different techniques and their subsequent characterization and high-pressure hydrogenation. The quasicrystals of this system are thermodynamically stable and they have a relatively good affinity for …
The synthesis and characterization of BaO-rich phases within the BaO-Nb2O5 and BaO-WO3-Nb2O5 systems
This PhD thesis presents experimental results from the synthesis, crystal structure and microwave dielectric characterization of BaO-rich phases within the BaO-Nb2O5 and BaONb2O5- WO3 system. I was primarily interested in two compounds with unknown crystal structure, i.e., the binary Ba4Nb2O9 and the ternary Ba6Nb2WO14, which lie on a common virtual …
Plasma sterilization of microorganisms
The sterilization efficiency of oxygen plasma was studied. Plasma was created in pure oxygen with an inductively coupled radiofrequency discharge. The discharge power was estimated to about 180 W. Plasma parameters were measured with a double Langmuir probe and a catalytic probe. Plasma parameters depended on pressure in the discharge …
Analysis of bacteria damages caused by treatment with oxygen plasma particles
The possible mechanisms for destruction of two types of bacteria with oxygen radicals were studied. Samples consisting of standard ATCC strains of Gram – positive bacteria Staphylococcus aureus and Gram – negative bacteria Escherichia coli were obtained. Bacteria were cultivated according to the standard procedures and fixed on substrates of …