Prohlížení Acta Polytechnica. 2012, vol. 52, no. 4 dle názvu

Zobrazují se záznamy 7-24 z 24

    • Checking the Geometric Accuracy of a Machine Tool for Selected Geometric Parameters 

      Autor: Janásek , Adam; Čep , Robert; Brychta , Josef
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper deals with the control parameters for selected geometric accuracy measurements for a machine tool. The parameters were needed after a refurbished milling machine was purchased. After setting up the machine, it ...

    • Concepts of Emission Reduction in Fluidized Bed Combustion of Biomass 

      Autor: Purgar , Amon; Winter , Franz
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      A status report on fluidized bed technology in Austria is under preparation, in response to the Fluidized Bed Conversion multi-lateral technology initiative of the International Energy Agency. This status report focuses ...

    • Contributions to the Study of Dynamic Absorbers, a Case Study 

      Autor: Balcau , Monica; Plesa , Angela; Opruta , Dan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Dynamic absorbers are used to reduce torsional vibrations. This paper studies the effect of a dynamic absorber attached to a mechanical system formed of three reduced masses which are acted on by one, two or three order x ...

    • Creating a Multi-axis Machining Postprocessor 

      Autor: Vavruška , Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper focuses on the postprocessor creation process. When using standard commercially available postprocessors it is often very difficult to modify its internal source code, and it is a very complex process, in many ...

    • Determination of Uncertainties for Correlated Input Quantities by the Monte Carlo Method 

      Autor: Goliaš , Marcel; Palenčár , Rudolf
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents the calculation of the uncertainty for distribution propagation by the Monte Carlo method for a measurement model with one output quantity. The procedure is shown on the basis of an example of the ...

    • Energy Accumulation by Hydrogen Technologies 

      Autor: Čermáková , Jiřina; Doucek , Aleš; Polák , Lukáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Photovoltaic power plants as a renewable energy source have been receiving rapidly growing attention in the Czech Republic and in the other EU countries. This rapid development of photovoltaic sources is having a negative ...

    • Fundamental Research on Hydraulic Systems Driven by Alternating Flow 

      Autor: Marcu , Ioan-Lucian; Banyai , Daniel-Vasile
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents a new approach to rotary hydraulic systems, and the functional principles of rotary hydraulic systems that can work using alternating flows. Hydraulic transmissions using alternating flows are based on ...

    • Holding Pressure and Its Influence on Quality in PIM Technology 

      Autor: Petera , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The PIM (powder injection molding) process consists of several steps in which faults can occur. The quality of the part that is produced usually cannot be seen until the end of the process. It is therefore necessary to ...

    • Influence of the Amount of Master Alloy on the Properties of Austenitic Stainless Steel AISI 316L Powder Sintered in Hydrogen 

      Autor: Skaloń , Mateusz; Kazior , Jan
      (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 Various Process Parameters on the Density of Sintered Aluminium Alloys 

      Autor: Laska , Mateusz; Kazior , Jan
      (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 ...

    • Laser Cutting of Materials of Various Thicknesses 

      Autor: Grepl , Martin; Pagáč , Marek; Petrů , Jana
      (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 

      Autor: Janovec , Jiří; Poláchová , Daniela; Junek , Michal
      (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 ...

    • Metallurgical Joining of Magnesium Alloys by the FSW Process 

      Autor: Kupec , Tomáš; Hlavačová , Ivana; Turňa , Milan
      (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). ...

    • New Abrasive Materials and Their Influence on the Surface Quality of Bearing Steel After Grinding 

      Autor: Jusko , Ondrej
      (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 ...

    • Replacing Natural Gas by Biogas — Determining the Bacterial Contamination of Biogas by PCR 

      Autor: Čermáková , Jiřina; Mrázek , Jakub; Fliegerová , Kateřina; Tenkrát , Daniel
      (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 ...

    • Strontium As a Structure Modifier for Non-binary Al–Si Alloy 

      Autor: Stunová , Barbora Bryksí
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents a study of the influence on the structure of AlSi10Mg alloy when 400 ppm of strontium is added. Not only changes in the morphology of eutectic silicon, but in particular changes in the morphology of the ...

    • The Effect of Temperature on the Gasification Process 

      Autor: Baláš , Marek; Lisý , Martin; Štelcl , Ota
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Gasification is a technology that uses fuel to produce power and heat. This technology is also suitable for biomass conversion. Biomass is a renewable energy source that is being developed to diversify the energy mix, so ...

    • The Simulation of the Influence of Water Remnants on a Hot Rolled Plate after Cooling 

      Autor: Zahradník , Radek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      In situations when a sheet metal plate of large dimensions is rolled, water remnants from cooling can be observed on the upper side of the plate. This paper focuses on deformations of a hot rolled sheet metal plate that ...