Ne (447)
Ano (60)
Použitá omezení
(2)
Počet nalezených dokumentů:
507
Publikováno od
do
Nanostructuring of solid surfaces by discharge-pumped xuv laser source
Schmidt, Jiří; Štraus, Jaroslav; Koláček, Karel; Frolov, Oleksandr
2015 - anglický
The experimental results of interaction of focused XUV laser beam (wavelength 46.9 nm) with Polymethylmethacrylate (PMMA) and GaAs samples will be presented. Proximity-standing golden grid showed on naturally-generated diffraction pattern that direct nanostructuring is possible
Klíčová slova:
XUV laser; laser ablation; diffraction pattern
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Nanostructuring of solid surfaces by discharge-pumped xuv laser source
The experimental results of interaction of focused XUV laser beam (wavelength 46.9 nm) with Polymethylmethacrylate (PMMA) and GaAs samples will be presented. Proximity-standing golden grid showed on ...
Measurements with Atomic Beam Probe Diagnostic on the COMPASS Tokamak
Háček, Pavel; Berta, Miklós; Krbec, Jaroslav; Stöckel, Jan; Weinzettl, Vladimír; Bencze, A.; Zoletnik, S.; Anda, G.
2015 - anglický
Atomic beam probe is a new diagnostic method for detection of ions coming from the ionized part of diagnostic neutral beams in tokamaks. The method allows to measure plasma density fluctuations and fast variations in the poloidal magnetic field. Therefore, one can follow fast changes in the edge plasma current. Test detector has been installed on COMPASS as an extension of lithium beam diagnostic and the article presents the first measurements done with the diagnostic
Klíčová slova:
plasma; tokamak; diagnostic
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Measurements with Atomic Beam Probe Diagnostic on the COMPASS Tokamak
Atomic beam probe is a new diagnostic method for detection of ions coming from the ionized part of diagnostic neutral beams in tokamaks. The method allows to measure plasma density fluctuations and ...
První experimenty s přípravou suspenzního nástřiku Al2O3 pomocí hybridního plazmového hořáku
Tesař, Tomáš; Mušálek, Radek; Medřický, Jan; Kotlan, Jiří; Pala, Zdeněk
2015 - český
Hybridní vodou stabilizovaný hořák WSP-H představuje zajímavou alternativu k běžným hořákům pro žárové stříkání, neboť poskytuje jedinečnou kombinaci rychlosti plazmatu a entalpie dostupné pro zpracování materiálu. V této práci je studován vliv depozičních parametrů na charakteristiky nástřiku. Jako modelový materiál byl použit nanometrický Al2O3 dispergovaný v etanolu. Nástřik byl zkoumán pomocí skenovací elektronové mikroskopie a rentgenové difrakce. Výsledky prokázaly závislost charakteru mikrostruktury a fázového složení na podávací vzdálenosti a podávaném množství suspenze. Výsledky jsou zajímavé pro další optimalizaci depozičního procesu Hybrid water stabilized plasmatron WSP-H represents an interesting alternative to common torches for thermal spraying, because it provides a unique combination of plasma velocity and enthalpy available for material processing. In this paper, influence of deposition parameters on coating characteristics was studied. Nanometric Al2O3 powder dispersed in ethanol was used as a model material. The coating was examined by scanning electron microscopy and X-ray diffraction and the results showed clear dependence of microstructure and phase composition on spraying distance and feed rate of the suspension. Results are promising for further optimization of the deposition process.
Klíčová slova:
suspension plasma spraying; alumina; microstructure
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
První experimenty s přípravou suspenzního nástřiku Al2O3 pomocí hybridního plazmového hořáku
Hybridní vodou stabilizovaný hořák WSP-H představuje zajímavou alternativu k běžným hořákům pro žárové stříkání, neboť poskytuje jedinečnou kombinaci rychlosti plazmatu a entalpie dostupné pro ...
Unfolding of energies of fusion products measured by the activation probe at JET
Ficker, Ondřej; Mlynář, Jan; Bonheure, G.; Murari, A.; Popovichev, S.
2015 - anglický
Providing a detection method for diagnostic of charged fusion products in tokamaks presents a major challenge, while its absolute calibration with a sufficient accuracy and its capability to withstand harsh fusion reactor environment will be required. A novel type of detector that meets most of these requirements, based on an activation probe, was tested in JET and other European facilities. This probe proved to be extremely robust due to its simple construction. It is equipped with samples of well defined isotopic abundance. The amounts of activated nuclei due to the reactions in these materials could be measured via ultra-low-level gamma spectroscopy. The feasibility of the proton spectrum reconstruction from measured activities is examined in this contribution with the help of the algorithm based on the Tikhonov regularisation constrained by minimum Fisher information. The reliability of the method was previously illustrated using synthetic proton data.
Klíčová slova:
fusion products; nuclear activation; protons; spectra
Dokument je dostupný na externích webových stránkách.
Unfolding of energies of fusion products measured by the activation probe at JET
Providing a detection method for diagnostic of charged fusion products in tokamaks presents a major challenge, while its absolute calibration with a sufficient accuracy and its capability to withstand ...
Enthalpy Probe Diagnostics of Steam/Argon Plasma Jet
Hlína, Michal; Hrabovský, Milan
2015 - anglický
DC plasma torch with argon/water stabilization features extreme properties of the exiting plasma jet. The plasma mass flow rate is very low while the temperature reaches very high values. Plasma properties were measured by enthalpy probe connected to a mass spectrometer. The measurements of enthalpy, temperature, density and dynamic pressure were carried out for three different arc currents and at atmospheric pressure. The dependences of plasma characteristics on arc current were shown.
Klíčová slova:
enthalpy probe; thermal plasma; plasma diagnostics
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Enthalpy Probe Diagnostics of Steam/Argon Plasma Jet
DC plasma torch with argon/water stabilization features extreme properties of the exiting plasma jet. The plasma mass flow rate is very low while the temperature reaches very high values. Plasma ...
Korektor komy D. M. Maksutova
Rail, Zdeněk; Jareš, Daniel; Vápenka, David
2015 - český
Nejjednodušším korektorem komy paraboloidického zrcadla je jednočočkový meniskový korektor Maksutova. Tento korektor, umístěný do sbíhavého svazku paraboloidu, opravuje komu a zároveň zachovává stigmatičnost systému na optické ose. Je snadno vyrobitelný a zvětšuje zorné pole paraboloidu třikrát. The simpliest coma corrector of the paraboloidal mirror is a singlet-meniscus of Maksutov. This corrector placed into converging beam of a paraboloidal mirror corrects coma and saves stigmatic image of the system on its optical axis. The corrector can be easily to built and enlarges the field of view about three times.
Klíčová slova:
Paraboloidal mirror; Coma corrector; Seydel sums; Abbe Sine Condition; Aplanatic system
Dokument je dostupný na externích webových stránkách.
Korektor komy D. M. Maksutova
Nejjednodušším korektorem komy paraboloidického zrcadla je jednočočkový meniskový korektor Maksutova. Tento korektor, umístěný do sbíhavého svazku paraboloidu, opravuje komu a zároveň zachovává ...
Boronized stainless steel with zirconia coatings
Brožek, Vlastimil; Kolísko, J.; Kubatík, Tomáš František; Mastný, L.; Pokorný, P.; Tej, P.
2015 - anglický
Conditions of boronizing are described using a reactive diffusion method of boron from boron carbide and lanthanum hexaboride so that the formation of Fe2B is preferred to FeB which is more brittle and whose structure does not satisfy the conditions for perfect adhesion of modified zirconia ceramics. Perfectly rigid adhesive connection of needle-like embedded interlayers Fe2B in steel AISI 303 prepared by reactive diffusion of a boronizing medium without activators at 1000 ° C and exposure of 2-4 hours has the value of 20 - 24 MPa at the Pinn-off test.Ceramic coatings from Al2O3-ZrO2 ceramics formed on those interlayers have the value of bond strength up to 14 - 20 MPa.Thermal cycling between 100°C - 600 °C confirmed good adhesion of coatings with the underlying steel.During thermal cycling at elevated temperatures (600-1000 °C) there occurs a statistically significant number of faults in cohesion and mechanical destruction of the coatings. One of the reasons are secondary changes
Klíčová slova:
Boronised steel; plasma spraying; ceramic coatings; bond strength; zirkonia coatings
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Boronized stainless steel with zirconia coatings
Conditions of boronizing are described using a reactive diffusion method of boron from boron carbide and lanthanum hexaboride so that the formation of Fe2B is preferred to FeB which is more brittle ...
Radial propagation of L-mode structures in COMPASS tokamak
Kovařík, Karel; Ďuran, Ivan; Stöckel, Jan; Seidl, Jakub; Havlíček, Josef; Háček, Pavel; Spolaore, M.; Vianello, N.
2015 - anglický
Various structures appear in the tokamak scrape-off layer (SOL) plasma with effects on plasma behavior. The filamentary probe recently introduced in the COMPASS tokamak allows measurement of electrostatic and magnetic properties of the filaments and their changes in dependence on distance from the last closed flux surface. This work presents evolution of the measured electromagnetic properties and their radial profiles as a part of the complex study of the processes in the SOL.
Klíčová slova:
plasma; tokamak
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Radial propagation of L-mode structures in COMPASS tokamak
Various structures appear in the tokamak scrape-off layer (SOL) plasma with effects on plasma behavior. The filamentary probe recently introduced in the COMPASS tokamak allows measurement of ...
Fyzikálně astronomické úvahy
Oupický, Pavel
2015 - český
Referát je zaměřen na problematické oblasti fyziky a fyzikálně astronomické úvahy The paper is oriented on the problem parts of physic and astronomy physical
Klíčová slova:
Radiation; antimatter; gravitation; atoms; neutrinos; big bang etc
Dokument je dostupný na externích webových stránkách.
Fyzikálně astronomické úvahy
Referát je zaměřen na problematické oblasti fyziky a fyzikálně astronomické úvahy
The paper is oriented on the problem parts of physic and astronomy physical
Microstructure and Properties of Spark Plasma Sintered Al-Zn-Mg-Cu Alloy.
Zyka, J.; Málek, J.; Pala, Zdeněk; Andršová, I.; Veselý, J.
2015 - anglický
High entropy alloys are a new material class with promising structural and mechanical properties in wide range of applications. In principle they consist of five or more elements in equimolar concentrations resulting basically in single phase microstructure. TaNbHfZrTi alloy was developed by Senkov for high temperature applications.\nSince all of these elements are biocompatible the TaNbHfZrTi alloy can be investigated as a prospective bio implant material. The alloy was prepared by vacuum arc melting, no annealing treatment was applied. Tensile test and hardness test at room temperature were performed with very good results: yield strength 1155 MPa, rupture strength 1212 MPa, Vickers hardness 359 HV30. Microstructure and fracture morphology was also investigated.
Klíčová slova:
High Entropy Alloys; Microstructure; Mechanical Properties; Tensile Test
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Microstructure and Properties of Spark Plasma Sintered Al-Zn-Mg-Cu Alloy.
High entropy alloys are a new material class with promising structural and mechanical properties in wide range of applications. In principle they consist of five or more elements in equimolar ...
NUŠL poskytuje centrální přístup k informacím o šedé literatuře vznikající v ČR v oblastech vědy, výzkumu a vzdělávání. Více informací o šedé literatuře a NUŠL najdete na webu služby.
Vaše náměty a připomínky posílejte na email nusl@techlib.cz
Provozovatel
Zahraniční báze