Acta Polytechnica CTU Proceedings. 2019 ( vol. 21-25): Poslední příspěvky
Zobrazují se záznamy 21-40 z 72
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ANALYSIS OF NEUTRON FIELDS GENERATED IN SPALLATION TARGETS OF B-URAN EXPERIMENTAL ASSEMBLY USING MONTE CARLO METHOD
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The aim of this paper is to introduce experimental assembly B-URAN and the results of Monte Carlo simulations of neutron fields, which will be generated by using various spallation targets. This experimental assembly was ... -
COMPRESSIVE PROPERTIES OF AUXETIC STRUCTURES WITH CONTROLLED STIFFNESS OF STRUT JOINTS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Presented paper deals with experimental study on compressive properties of auxetics with controlled stiffness of strut joints. The variable strut joints properties were simulated by adding extra amount of material in the ... -
EVALUATION OF HOPKINSON BAR EXPERIMENTS USING MULTIPLE DIGITAL IMAGE CORRELATION SOFTWARE TOOLS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Three different tools for Digital Image Correlation (DIC) were used for evaluation of dynamic experiments performed using custom Open Hopkinson Pressure Bar (OHPB) apparatus. High strain-rate measurements were performed ... -
HIGH STRAIN-RATE COMPRESSIVE TESTING OF FILLING MATERIALS FOR INTER-PENETRATING PHASE COMPOSITES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)In this study behavior of the selected types of filling material for the inter-penetrating phase composites was tested in compressive loading mode at low and high strain-rates. Three types of the filling material were ... -
DIRECT MEASUREMENT OF REACTION FORCES DURING FAST DYNAMIC LOADING
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The presented paper is focused on embedding of the serially manufactured piezo-electric impact loadcell into Open Hopkinson Pressure Bar (OHPB) and it’s modifications for a direct force measurement during dynamic loading. ... -
NUMERICAL MODELLING OF WAVE SHAPES DURING SHPB MEASUREMENT
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The paper aims at the numerical simulation of the wave propagation in compressive Split Hopkinson Pressure Bar (SHPB) experiment. The paper deals with principles of SHPB measurement, optimisation of a numerical model and ... -
MECHANICAL AND OPTICAL INVESTIGATION OF LASER WELDED STRUCTURAL STEEL - POLY(METHYL-METHACRYLATE) HYBRID JOINT STRUCTURES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Modern welding processes that can easily be automated (such as friction stir welding, laser welding and ultrasonic welding) are gaining popularity in joining metal-polymer hybrid structures. This field of science is ... -
MULTIAXIAL INVESTIGATION OF PVC FOAMS AND ANALYSIS OF THE DEFORMATION MECHANISM BY 3D-DIC
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)Closed-cell polyvinylchloride (PVC) foams are widely used as core for sandwich composites for applications, in which multiaxial loads are involved. In the present work a wide range of uniaxial (tension, compression and ... -
DIAMOND DETECTORS FOR FAST TRANSIENT SCRAM MEASUREMENTS – THE DETECTOR DEVELOPMENT
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)This paper presents a development of special diamond detector for time dependent neutron flux measurements in a nuclear reactor. Neutron flux changes during SCRAM are difficult to measure by existing detector technologies. ... -
PHYSICAL-MECHANICAL PROPERTIES AND DURABILITY OF HYDRAULIC LIME-BASED MORTARS WITH NON-TRADITIONAL BIOPOLYMERS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The study focuses on the influence of addition of four different biopolymers in various doses (0.1%, 0.5%, and 1%) on the physical-mechanical properties and durability of NHL 3.5 mortars prepared with constant water/binder ... -
LIGHTWEIGHT UHPC FACADE PANEL WITH LED DISPLAY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)This article deals with the development of lightweight UHPC facade panel which also can serve as an LED display. Combining both functions into one gives the potential ability to create a LED display on the facade of the ... -
A HEADRACE TUNNEL RECONSTRUCTION IN TURKEY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The operation of a hydro power project in North Turkey started in 2015, included the 12km long headrace tunnel. An 8km long lower tunnel section was excavated by double shield TBM technology with 8.7m ID. Due to problems ... -
PREPARATIONS FOR REMEDIATION OF A FORMER SURFACE MINE – A TECHNICAL RECLAMATION AREA
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The reclamation area for secondary float energy by-products is located on a spoil heap, 45m thick and 30 years old, and consists mostly of clay stone with high plasticity. When depositing a first 18m high stack, it was ... -
EXPERIMENTAL STUDIES OF ACCELERATED CHLORIDE TRANSPORT IN CONCRETE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)This contribution deals with the efficiency of electromigration of chlorides used as a repair method for reinforced concrete structures. Experimental studies of accelerated chloride transport tests were performed on samples ... -
3D FEM ANALYSIS OF THE CONSTRUCTION PIT FOR A TBM-DRIVEN FLOOD DISCHARGE GALLERY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)As one speciality of the Swiss hydraulic engineering tradition, several torrent diversion schemes were undertaken dating from the 18th century, with the aim of using the natural lake as a retention basin. The recent project ... -
PRACTICAL USE OF MODERN INVESTIGATION AND MONITORING METHODS IN POLISH LANDSLIDE REMEDIATION PROJECTS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)This paper discusses exemplary landslide investigations in natural Carpathian and man-made opencast mine slopes. Research methods included mapping, core drilling, laboratory testing, GPR scanning, on-line inclinometer, ... -
RECONSTRUCTION OF NEGRELLI'S VIADUCT FROM A GEOTECHNICAL ENGINEERING POINT OF VIEW
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The reconstruction project deals with the unsatisfactory condition of the bridge construction, involving the railway superstructure with its signalling, communication and power equipment as well as the overhead lines all ... -
IN-SERVICE REMEDIATION OF A RAILWAY EMBANKMENT TO PREVENT SETTLEMENT
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)After optimization of the railway geometry for higher speed, a continuous settlement of the track occurred. Improvement of the embankment body was needed; however, a complete traffic interruption was not allowed. The ... -
COATED CLADDING BEHAVIOR DURING HIGH-TEMPERATURE TRANSIENTS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The concept of accident-tolerant fuels has been proposed and widely investigated over the past decade. The contribution is focused on one of the near-term approaches - the modification of the surface of existing Zr-alloy ... -
HIGH-TEMPERATURE STEAM AND AIR OXIDATION OF CHROMIUM-COATED OPTIMIZED ZIRLO™
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)The presented study focuses on Cr-coated cladding material and its oxidation performance in high-temperature steam and air. As the substrate material, Optimized ZIRLO™ was used which was coated by chromium using unbalanced ...