Number of found documents: 602
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Optický prvek 2G20 6x8x mm
Pintr, Pavel
2018 - Czech
Optický prvek 2G20 6x8 mm je určen pro proměnné dopravní značení (PDZ) v dopravě . Zajišťuje promíchání RGB diod na bílé světlo a jeho usměrnění do směru dle normy ČSN EN 12966 třídy B6. \n Optical element 2G20 6x8 mm is designed for a variable traffic marking. It assures the mixing of RGB diodes in white light and its direction in accordance with the specification ČSN EN 12966 class B6. Keywords: optical element; 2G20 6x8 mm; PDZ Available at various institutes of the ASCR
Optický prvek 2G20 6x8x mm

Optický prvek 2G20 6x8 mm je určen pro proměnné dopravní značení (PDZ) v dopravě . Zajišťuje promíchání RGB diod na bílé světlo a jeho usměrnění do směru dle normy ČSN EN 12966 třídy B6. ...

Pintr, Pavel
Ústav fyziky plazmatu, 2018

Dalekohledy typu Dall-Kirkham
Rail, Zdeněk; Ulrichová, Iva; Kuryshev, V.; Vápenka, David
2018 - Czech
Referát se zabývá optickými vadami dvojzrcadlových dalekohledů s elipsoidálními primárními a sférickými sekundárními zrcadly. Systém byl objeven na konci dvacátých let minulého století Horacem Dallem a Alanem Kirkhamem. Jeho optické prvky jsou snadno vyrobitelné a měřitelné. Tyto dalekohledy lze vybavit korektory a vytvořit z nich víceúčelové přístroje jak pro planetární pozorování, tak pro fotografování širokých zorných polí. Několik takových přístrojů bylo vyrobeno i v dílně Centra Toptec v Turnově. The paper deals with the optical aberrations of the two-mirror telescopes composed of the ellipsoidal primary and the spherical secondary mirrors. The system was discovered by Horace Dall and Alan Kirkham at the end of the Twenties of the 20th Century. Its optical elements are easy to manufacture and measure. These telescopes can be equipped by lens correctors and turned into multipurpose devices both for planetary observation and wide field photography. Several telescopes were manufactured in workshop of the Toptec Center in Turnov. Keywords: Two-mirror telescope; field corrector; optical aberrations; spherochromatic aberration; koma; astigmatism Available at various institutes of the ASCR
Dalekohledy typu Dall-Kirkham

Referát se zabývá optickými vadami dvojzrcadlových dalekohledů s elipsoidálními primárními a sférickými sekundárními zrcadly. Systém byl objeven na konci dvacátých let minulého století Horacem Dallem ...

Rail, Zdeněk; Ulrichová, Iva; Kuryshev, V.; Vápenka, David
Ústav fyziky plazmatu, 2018

The effect of spark plasma sintering on the porosity and mechanical properties of Ti-15Mo alloy
Terynková, A.; Kozlík, J.; Bartha, K.; Chráska, Tomáš; Dlabáček, Zdeněk; Stráský, J.
2018 - English
Metastable β-titanium alloys are receiving much interest for various applications such as aircraft industry and medicine thanks to their excellent mechanical properties and biocompatibility. The common way of preparing the titanium alloys is hindered by its production costs. Powder metallurgy (PM) approach is a promising route for cost-effective fabrication of titanium alloys due to possibility of near net shaping. In this study, binary biomedical Ti-15Mo alloy was prepared by PM. Gas atomized powder was sintered by spark plasma sintering (SPS) above the β-transus temperature of the studied alloy. The compaction of the powders was accomplished by short-time sintering. The effect of the time of sintering on the porosity and the microhardness in centre part as well as in periphery part of the sample was investigated. The samples revealed significant inhomogeneity the porosity increases with the distance from the centre of the specimen. With increasing sintering times the porosity decreases and simultaneously the microhardness increases. Keywords: Metastable β-titanium alloys; Porosity; Powder metallurgy; Spark plasma sintering Available at various institutes of the ASCR
The effect of spark plasma sintering on the porosity and mechanical properties of Ti-15Mo alloy

Metastable β-titanium alloys are receiving much interest for various applications such as aircraft industry and medicine thanks to their excellent mechanical properties and biocompatibility. The ...

Terynková, A.; Kozlík, J.; Bartha, K.; Chráska, Tomáš; Dlabáček, Zdeněk; Stráský, J.
Ústav fyziky plazmatu, 2018

Optický element pro dopravní tabule 2G25 varA
Pintr, Pavel
2018 - Czech
Výzkumná zpráva popisuje vývoj a měření optiky pro dopravní informační tabule označenou jako 2G25 varA. První část zprávy popisuje vývoj kolimovaného svazku a tvorbu obdélníkového spotu dle požadavků normy ČSN EN 12966. Druhá část zprávy popisuje provedená optická měření. The optical element 2G25 varA is designed according the specification ČSN EN 12966 class B6 for traffic marking. The front optical lens is freeform optics with polynomial coefficients. This element uses RGB LED for mixing white light. Keywords: optical element; freeform; ČSN EN 12966 Available at various institutes of the ASCR
Optický element pro dopravní tabule 2G25 varA

Výzkumná zpráva popisuje vývoj a měření optiky pro dopravní informační tabule označenou jako 2G25 varA. První část zprávy popisuje vývoj kolimovaného svazku a tvorbu obdélníkového spotu dle požadavků ...

Pintr, Pavel
Ústav fyziky plazmatu, 2018

Relativistic effects in plasma produced with sub-nanosecond 3-TW laser
Krása, J.; Klír, Daniel; Řezáč, Karel; Cikhardt, Jakub; Krůs, Miroslav; Velyhan, Andriy; Pfeifer, Miroslav; Dostál, Jan; Dudžák, Roman; Krupka, Michal; Kaufman, J.; Pisarczyk, T.; Kalinowska, Z.; Chodukowski, T.
2018 - English
This contribution deals with observations of relativistic electrons produced in a laser plasma interaction experiment at the PALS laser system operated at the Institute of Plasma Physics in Prague. The PALS laser is a near-infrared 3-TW iodine laser designed to deliver irradiance on target of 1016 Wcm2- in≈300 ps pulses at the wavelength of 1.315 μm. Various foils of 6 500 μm in thickness were irradiated with Iλ2 ≈5×1016 W cm-2 μm2 Under these conditions we have observed relativistic electrons expanding into the vacuum with maximum energy going beyond 4 MeV. The relativistically accelerated forward electrons escaping from the rear target surface were observed with the use of electron energy analysers. The observed electron energy spectra indicate that the applied laser intensity was increased by the thermal and relativistic self-focusing. The application of a unique femtosecond interferometry technique allowed us to observe bunches of thermal electrons occurring in the plasma expanding against the focused laser beam. Keywords: laser-produced plasma; relativistic electrons Fulltext is available at external website.
Relativistic effects in plasma produced with sub-nanosecond 3-TW laser

This contribution deals with observations of relativistic electrons produced in a laser plasma interaction experiment at the PALS laser system operated at the Institute of Plasma Physics in Prague. ...

Krása, J.; Klír, Daniel; Řezáč, Karel; Cikhardt, Jakub; Krůs, Miroslav; Velyhan, Andriy; Pfeifer, Miroslav; Dostál, Jan; Dudžák, Roman; Krupka, Michal; Kaufman, J.; Pisarczyk, T.; Kalinowska, Z.; Chodukowski, T.
Ústav fyziky plazmatu, 2018

Vývoj optického řešení Prototypu II
Pintr, Pavel
2018 - Czech
Zpráva popisuje vývoj aktivní laserové hlavice. Zpráva je rozdělena do dvou etap. První etapa popisuje vývoj navařovací laserové hlavice s obdélníkovým spotem. Druhá část popisuje vývoj svařovací hlavice s proměnným zvětšením. This report describes the development of an active laser head. This report is separated into two sections. First section describes a development of laser head with the rectangular spot. The second section describes a development of welding laser head with the adaptive zoom. Keywords: laser head; active optics; LIMO Available at various institutes of the ASCR
Vývoj optického řešení Prototypu II

Zpráva popisuje vývoj aktivní laserové hlavice. Zpráva je rozdělena do dvou etap. První etapa popisuje vývoj navařovací laserové hlavice s obdélníkovým spotem. Druhá část popisuje vývoj svařovací ...

Pintr, Pavel
Ústav fyziky plazmatu, 2018

Test procedure - neosted SOT test bench
Pleštil, Jan; Steiger, Lukáš; Václavík, Jan; Veselý, Martin
2018 - English
This document describes the final design of the NEOSTED SOT Test Bench, i.e. its individual components, and serves as a groundwork for the acceptance test procedure.\nThe test to be performed according to this procedure are to demonstrate the compliance of the above item to the requirements specified in the applicable document [1] as part of the overall verification program. The test results shall be collected in a Test Report. Keywords: collimator; optical tests; stage; alignment Available at various institutes of the ASCR
Test procedure - neosted SOT test bench

This document describes the final design of the NEOSTED SOT Test Bench, i.e. its individual components, and serves as a groundwork for the acceptance test procedure.\nThe test to be performed ...

Pleštil, Jan; Steiger, Lukáš; Václavík, Jan; Veselý, Martin
Ústav fyziky plazmatu, 2018

Výzkumná zpráva Projekt MidFree
Beneš, Jiří; Matoušek, Ondřej; Špína, Michal; Tomka, David
2018 - Czech
Výzkumná zpráva popisující model procesního řetězce, metodiky měření a charakterizace středních frekvencí (MSF), vibrací a hodnocení nástrojů. Research report describing the process chain model, MSF measurement methodology, vibration and tool evaluation. Keywords: mid spatial frequencies measurement; vibration measurement Available at various institutes of the ASCR
Výzkumná zpráva Projekt MidFree

Výzkumná zpráva popisující model procesního řetězce, metodiky měření a charakterizace středních frekvencí (MSF), vibrací a hodnocení nástrojů....

Beneš, Jiří; Matoušek, Ondřej; Špína, Michal; Tomka, David
Ústav fyziky plazmatu, 2018

Fluctuations in the scrape-off layer and edge plasma of the COMPASS tokamak
Seidl, Jakub; Jiráková, Kateřina; Adámek, Jiří; Grover, Ondřej; Horáček, Jan; Hron, Martin; Vondráček, Petr
2018 - English
In this work we study properties of turbulent structures in the scrape-off layer (SOL) and edge plasma of the COMPASS tokamak. Two distinct types of coherent oscillations are observed: a) broadband high frequency branch rotating in the electron diamagnetic direction, appearing mainly in the confined region but protruding also to the SOL b) low-frequency blobs rotating in an opposite poloidal direction, formed in the vicinity of the radius of zero electric field. The transition region is localized in the near SOL, where both types spatially overlap and interact and the radial particle transport gradually transfers from high to low frequencies. Even though skewness of fluctuations of the ion saturation current is positive even inside LCFS, distinguishable Gamma-distributed PDF, formed by the low-frequency fluctuations, arises in the near SOL and most of the fluctuations that form a positive skewness in the edge region disappear around LCFS. Keywords: plasma; tokamak; turbulence Fulltext is available at external website.
Fluctuations in the scrape-off layer and edge plasma of the COMPASS tokamak

In this work we study properties of turbulent structures in the scrape-off layer (SOL) and edge plasma of the COMPASS tokamak. Two distinct types of coherent oscillations are observed: a) broadband ...

Seidl, Jakub; Jiráková, Kateřina; Adámek, Jiří; Grover, Ondřej; Horáček, Jan; Hron, Martin; Vondráček, Petr
Ústav fyziky plazmatu, 2018

Microstructure of commercially pure titanium after cryogenic milling and spark Plasma sintering
Kozlík, J.; Harcuba, P.; Stráský, J.; Chráska, Tomáš; Janeček, M.
2018 - English
Commercially pure titanium was prepared by advanced powder metallurgy methods with the aim to produce the ultra-fine grained material. Cryogenic attritor milling was used as a first step to refine the microstructure at liquid argon temperatures to suppress recovery and dynamic recrystallization. Spark plasma sintering was subsequently employed to produce bulk material, exploiting its ability to achieve fully dense structure in short time and thus to reduce the grain growth. In order to understand the undergoing microstructural changes during the process, detailed investigation was performed after each preparation step. Powder morphology was changed significantly after milling, while particle fragmentation was only limited. Grain size after sintering was in micrometer scale, relatively independent of sintering conditions. Keywords: Cryogenic milling; Microstructure; Spark plasma sintering; Titanium Available at various institutes of the ASCR
Microstructure of commercially pure titanium after cryogenic milling and spark Plasma sintering

Commercially pure titanium was prepared by advanced powder metallurgy methods with the aim to produce the ultra-fine grained material. Cryogenic attritor milling was used as a first step to refine the ...

Kozlík, J.; Harcuba, P.; Stráský, J.; Chráska, Tomáš; Janeček, M.
Ústav fyziky plazmatu, 2018

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