The Modeling of the Fan-Cooler Systems of the Containment VVER 440 V213 NPP

Doktorská dizertačná práca sa zaoberá problematikou zostavenia modelu existujúcich ventilačných systémov jadrového bloku VVER440/V213 v režimoch pokrývajúcich nie len oblasť normálnej prevádzky bloku na výkone, ale aj abnormálnej prevádzky a havarijných stavov bloku, ktoré sa významne odlišujú od návrhových podmienok týchto systémov. Práca sa zaoberá zostavením a popisom pokročilého modelu, ktorý je schopný predikovať správanie sa týchto systémov pri ich prípadnej prevádzke počas havarijných režimov bloku. Predstavený model je súčasťou širšieho modelu LEAKBOX, ktorý sa zaoberá modelovaním procesov v hermetickej zóne jadrového bloku VVER 440 počas havarijných režimov spojených s malým únikom chladiva.The topic of the thesis regards of problems of compilation the model of existing fan-cooler systems of VVER440/V213 NPP. These systems can be operated not only normal operation conditions but also during abnormal and accidental operation of the plant, which are significantly different from those operating conditions for which were systems dedicated and designed. An advanced model, compiled as one of the subjects of this thesis, capable to predict behaviour of these systems during accidental conditions of the plant, is described within this paper. The advanced model is a part of LEAKBOX model. LEAKBOX model represents a superordinated program dedicated to modelling overall VVER 440/V213 containment response during accidental conditions of the plant focusing onto small coolant leakage in to the containment.

RIO Country Report Slovak Republic 2014

The report offers an analysis of the R&I system in the Slovak Republic for 2014, including relevant policies and funding, with particular focus on topics critical for two EU policies: the European Research Area and the Innovation Union. The report was prepared according to a set of guidelines for collecting and analysing a range of materials, including policy documents, statistics, evaluation reports, websites etc. The report identifies the structural challenges of the Slovak research and innovation system and assesses the match between the national priorities and those challenges, highlighting the latest policy developments, their dynamics and impact in the overall national context.JRC.J.6-Innovation Systems Analysi

Current-pulse-induced magnetic switching in standard and nonstandard spin-valves

Magnetization switching due to a current-pulse in symmetric and asymmetric spin valves is studied theoretically within the macrospin model. The switching process and the corresponding switching parameters are shown to depend significantly on the pulse duration and also on the interplay of the torques due to spin transfer and external magnetic field. This interplay leads to peculiar features in the corresponding phase diagram. These features in standard spin valves, where the spin transfer torque stabilizes one of the magnetic configurations (either parallel or antiparallel) and destabilizes the opposite one, differ from those in nonstandard (asymmetric) spin valves, where both collinear configurations are stable for one current orientation and unstable for the opposite one. Following this we propose a scheme of ultrafast current-induced switching in nonstandard spin valves, based on a sequence of two current pulses.Comment: 7 pages, 5 figures; to be published in Phys. Rev.

Modeling of the dynamic load of cylindrical tanks

Tento príspevok sa zaoberá výpočtom vnútorných síl a deformácií valcovej nádrže od účinkov dynamického namáhania, ktoré je reprezentované seizmickým zaťažením. Zaťaženie bolo modelované dvomi metódami a to pomocou spektra odozvy - model M1 a v druhom prípade podľa normy STN EN 1998-4 -model M2.In this paper two types of calculating methods of internal forces and deformations of cylindrical tank due to seismic load are presented. The loading was modelled by two different methods: either by means the seismic response spectrum (Model M1), or according to the standard STN EN 1998-4 (Model M2)

Electrolysis of Gold from Filtration Waste by Means of Mechanical Activation

The intensification of the gold thiourea leaching from a filtration waste (Košice, Slovakia) using mechanical activationas the pretreatment step has been studied. The leaching of “as-received“ sample in an acid thiourea solution resulted in 65 % Audissolution. However, after mechanical activation in a planetary mill 99 % of the gold was leached. The optimum redox potential forelectrolysis is in the range 500-523 mV for the gold extraction 99.79 % from the mechanically activated sample. The mechanicalactivation resulted in an increase of the specific surface area of the waste from 0.7 m2g-1 to a maximum value of 13.5 m2g-1. The physicochemicalchanges in the filtration waste as a consequence of mechanical activation had a pronounced influence on the subsequent goldextraction

Uniform density u and corresponding I_{u} - convergence

The concept of a uniform density of subsets A of the set N of positive integers was introduced in [1] and [2]. Corresponding I_{u} -convergence to the notion of uniform density u can be found in [8]. This paper studies I_{u}-convergence in detail

Influence of Transverse Bending Moment in the Flange of Corrugated I-Girders

AbstractThe influence of the reduction factor decreasing the yield stress on the resistance of the girder with corrugated web made of steel [1] or made of aluminium alloy [2] are analyzed and evaluated. The values and the distributions of the transverse bending moment resulting from the shear flow in flanges are calculated and analyzed. The approximate formula for Mz is derived, because Mz is not defined in the Eurocodes [1,2]. Two steel girders with span Z = 18m and L = 12m are investigated. The proposals for the improvements of Eurocodes [1,2] are given