Prohlížení Acta Polytechnica. 2012, vol. 52 dle názvu
Zobrazují se záznamy 61-80 z 100
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Massive Parallelization of Multibody System Simulation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper deals with the decrease in CPU time necessary for simulating multibody systems by massive parallelization. The direct dynamics of multibody systems has to be solved by a system of linear algebraic equations. ... -
Measurement of O2 in the Combustion Chamber of Apulverized Coal Boiler
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Operational measurements of the O2 concentration in the combustion chamber of a pulverized coal boiler are not yet common practice. Operators are generally satisfied with measuring the O2 concentration in the second pass ... -
Metallurgical Joining of Magnesium Alloys by the FSW Process
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper deals with welding AZ 31Mg alloy by FSW (Friction Stir Welding) technology. Welds were fabricated with new equipment supplied from China for VUZ-PI Bratislava (Welding Research Institute — Industrial Institute). ... -
Micromechanical Analysis of Cement Paste with Carbon Nanotubes
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Carbon nanotubes (CNT) are an attractive reinforcement material for several composites, due to their inherently high strength and high modulus of elasticity. There are controversial results for cement paste with admixed ... -
Model of Customer Buying Behavior in the CZ Mobile Telecommunication Market
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)The Czech mobile telecommunication market constitutes an oligopoly of three operators, who have built a privileged position and effectively crush any competition. The entry of a new operator has been considered by the ... -
Modeling of Concrete Creep Based on Microprestress-solidification Theory
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Creep of concrete is strongly affected by the evolution of pore humidity and temperature, which in turn depend on the environmental conditions and on the size and shape of the concrete member. Current codes of practice ... -
Modularity of Pressing Tools for Screw Press Producing Solid Biofuels
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper focuses on the development of the newly-patented structure of a screw briquetting machine for compacting biomass into a solid biofuel. The design of the machine is based on the results of a comprehensive study ... -
New Abrasive Materials and Their Influence on the Surface Quality of Bearing Steel After Grinding
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper focuses on the influence of various types of abrasive grains on cutting properties during the grinding process for bearing steel. In this experiment, not only conventional super-hard abrasive materials but also ... -
On the Relation Between GRB Classes and Xray Flashes
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Gamma-ray bursts are usually classified into either short-duration or long-duration bursts. Going beyond the short-long classification scheme, it has been shown on statistical grounds that a third, intermediate population ... -
OOFEM — an Object-oriented Simulation Tool for Advanced Modeling of Materials and Structures
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)The aim of this paper is to describe the object-oriented design of the finite element based simulation code. The overall, object-oriented structure is described, and the role of the fundamental classes is discussed. The ... -
Optimal Combustion Conditions for a Small-scale Biomass Boiler
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper reports on an attempt to achieve maximum efficiency and lowest possible emissions for a small-scale biomass boiler. This aim can be attained only by changing the control algorithm of the boiler, and in this way ... -
Optimization of Fuzzy Logic Controller for Supervisory Power System Stabilizers
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper presents a powerful supervisory power system stabilizer (PSS) using an adaptive fuzzy logic controller driven by an adaptive fuzzy set (AFS). The system under study consists of two synchronous generators, each ... -
Overhead Line Mechanics Taking the Influence of Wind into Account
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper deals with problems of overhead line motion. The line model is based on a dynamic description of a catenary curve. The benefits of dynamic modeling in this field are decrypted, and there is an explanation of one ... -
Physical and Chemical Aspects of the Nucleation of Cement-Based Materials
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)A theoretical model of the nucleation of portlandite is proposed, and the critical size of a portlandite cluster and the energy barrier of nucleation are determined. The steady state nucleation rate and the time lag of the ... -
Plasma Flow and Temperature in a Gliding Reactor with Different Electrode Configurations
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper deals with the plasma flow shape depending on the electrode form of a gliding discharge plasma-chemical reactor, and with the temperature distribution along the direction of the plasma flow in one specific ... -
Plasma Surface Treatment of Powder Materials — Process and Application
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Polyolefin particles are hydrophobic, and this prevents their use for various applications. Plasma treatment is an environment-friendly polyolefin hydrophilisation method. We developed an industrial-scale plant for plasma ... -
Prediction of Lower Extremity Movement by Cyclograms
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Human gait is nowadays undergoing extensive analysis. Predictions of leg movements can be used for orthosis and prosthesis programming, and also for rehabilitation. Our work focuses on predicting human gait with the use ... -
Production of Biocellulosic Ethanol from Wheat Straw
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Wheat straw is an abundant lignocellulosic feedstock in many parts of the world, and has been selected for producing ethanol in an economically feasible manner. It contains a mixture of sugars (hexoses and pentoses).Two-stage ... -
Production of Biodiesel from Vegetable Oil Using Microware Irradiation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)The petroleum oil supply crisis, the increase in demand and the price eruption have led to a search for an alternative fuel of bio-origin in India. Among the alternative fuels, biodiesel is considered as a sustainable ... -
Replacing Natural Gas by Biogas — Determining the Bacterial Contamination of Biogas by PCR
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)A promising way of using biogas is to upgrade it to natural gas, which is referred to as Substitute Natural Gas (SNG) or biomethane. Biomethane, or biogas, is produced by biological processes of harnessing the ability of ...