Prohlížení Acta Polytechnica. 2012, vol. 52 dle názvu
Zobrazují se záznamy 53-72 z 100
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Idealized Compression Ratio for a Screw Briquetting Press
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper deals with issues in determining the ideal compression ratio for a screw briquetting press. First, the principles of operation and a basic description of the main parts of a screw briquetting press are introduced. ... -
Influence of the Amount of Master Alloy on the Properties of Austenitic Stainless Steel AISI 316L Powder Sintered in Hydrogen
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)AISI 316L austenitic stainless steel powder was modified with four different amounts of boron (0.1; 0.2; 0.3; 0.4 of wt. %) in the form of MasterAlloy micro-powder, and was sintered in a pure dry hydrogen atmosphere in ... -
Influence of the Surface Layer when the CMT Process Is Used for Welding Steel Sheets Treated by Nitrooxidation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Nitrooxidation is a non-conventional surface treatment method that can provide significantly improved mechanical properties as well as corrosion resistance. However, the surface layer is a major problem during the welding ... -
Influence of Various Process Parameters on the Density of Sintered Aluminium Alloys
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)This paper presents the results of density measurements carried out on Alumix sintered parts. ECKA Alumix aluminium powders were used because of their wide application in the powder metallurgy industry. The compacts were ... -
Integration of Autonomous UAVs into Multi-agent Simulation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)In recent years, Unmanned Aerial Vehicles (UAVs) have attracted much attention both in the research field and in the field of commercial deployment. Researchers recently started to study problems and opportunities connected ... -
Lab-scale Technology for Biogas Production from Lignocellulose Wastes
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Currently-operating biogas plants are based on the treatment of lignocellulose biomass, which is included in materials such as agriculture and forestry wastes, municipal solid wastes, waste paper, wood and herbaceous energy ... -
Laser Cutting of Materials of Various Thicknesses
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)Thise paper deals with the application of laser technology and optimizing the parameters for cutting nickel alloy. The theoretical part of the paper describes various types of lasers, their principles and usage. The ... -
Lifetime Assessment of a Steam Pipeline
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)The aim of this paper is to design a method for assessing the life of steam pipes for Czech power plants. The most widely-used material in Czech power plants is steel 15 128. Our findings may also be applied for international ... -
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 ...