Number of found documents: 47
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Konstrukce spektroskopu pro pozorování hvězdných spekter
Rail, Zdeněk; Jareš, Daniel; Pintr, Pavel; Vápenka, David
2015 - Czech
Tento článek předkládá návod na konstrukci přístroje - spektroskopu pro vizuální pozorování hvězdných spekter. K jeho stavbě je použito běžně prodávaných součástek. Samotné sestavení přístroje lze provést bez pomoci obráběcích strojů ve spartánsky vybavené dílně. This paper presents the construction list of a spectroscope for visual observation of stellar spectra. The device consists of parts easily accessible on market. Assembly of the spectroscope does not require exceptionally equipped workshop and can be made in very spartan conditions. Keywords: Spectrograph; Star spectral line; Newton telescope; Barlow lens; Difraction grating; Colimator lens; Toroidal lens; StarAnalyzer grating Fulltext is available at external website.
Konstrukce spektroskopu pro pozorování hvězdných spekter

Tento článek předkládá návod na konstrukci přístroje - spektroskopu pro vizuální pozorování hvězdných spekter. K jeho stavbě je použito běžně prodávaných součástek. Samotné sestavení přístroje lze ...

Rail, Zdeněk; Jareš, Daniel; Pintr, Pavel; Vápenka, David
Ústav fyziky plazmatu, 2015

Synthesis and applications of Intermetallics
Novák, P.; Salvetr, P.; Kříž, J.; Kubatík, Tomáš František
2015 - English
Intermetallic compounds, intermetallics, are characterized by interesting properties, such as e.g. excellent high -temperature oxidation resistance, shape memory or ability to store hydrogen reversibly. Their positive, but also negative, properties are a combination of the behaviour of metals and ceramics. Their wider application in industry is limited due to low room-temperature ductility and problematic production, associated with high melting points of many intermetallics, high reactivity of metals at high temperatures and problematic processing. In this paper, the overview of the methods for synthesis of intermetallic compounds is presented, ranging from conventional casting processes to modern powder metallurgy technologies. Selected interesting applications from industry and medicine, where their unique properties are used Keywords: Intermetallic compounds; powder metallurgy technologies Fulltext is available at external website.
Synthesis and applications of Intermetallics

Intermetallic compounds, intermetallics, are characterized by interesting properties, such as e.g. excellent high -temperature oxidation resistance, shape memory or ability to store hydrogen ...

Novák, P.; Salvetr, P.; Kříž, J.; Kubatík, Tomáš František
Ústav fyziky plazmatu, 2015

Structural and Mechanical Characterization of Spark Plasma Sintered Tungsten
Čech, J.; Haušild, P.; Kocmanová, Lenka; Matějíček, Jiří
2015 - English
The main objective of this paper is to describe the microstructure and mechanical properties of spark plasma sintered tungsten. The indentation tests, which are very advantageous because of their semi-nondestructive character and low requirements on the volume of investigated material, were carried out using Berkovich and spherical indenters. Indentation techniques with spherical indenters are less frequently used than those with sharp indenters but they offer variation of strain with the indentation depth and, therefore, they could be used for determination of stress-strain curves. Local stress-strain behavior obtained by this method showed good correspondence with the results of compression tests. Observation of the microstructure and the fracture surfaces helped to explain some phenomena which occurred during the mechanical testing Keywords: tungsten; SPS; instrumented indentation Fulltext is available at external website.
Structural and Mechanical Characterization of Spark Plasma Sintered Tungsten

The main objective of this paper is to describe the microstructure and mechanical properties of spark plasma sintered tungsten. The indentation tests, which are very advantageous because of their ...

Čech, J.; Haušild, P.; Kocmanová, Lenka; Matějíček, Jiří
Ústav fyziky plazmatu, 2015

Chemical aspects of antiballistic cermets preparation
Brožek, Vlastimil; Kubatík, Tomáš František; Chráska, Tomáš; Mušálek, Radek; Janata, Marek; Mastný, L.
2015 - English
The paper aims to demonstrate the possibilities of metal-ceramic material deposition on different types of metal or ceramic substrates using plasma deposition. A number of self-supporting components and the preparation of metal-braced composites are described and the results of plasma depositions of two particular extremely hard ceramic materials, boride and nitride of titanium are presented. The plasma deposition of these material is performed in technological conditions which prevent undesirable high-temperature oxidation. The paper describes deposition conditions that may lead to materials suited to create anti-ballistic protection and complicated shapes or improve parameters of surface layers of present anti-ballistic ceramics. Keywords: Anti-ballistic ceramics; armour ceramics; plasma spraying; titanium boride; plasma spraying; titanium nitride Fulltext is available at external website.
Chemical aspects of antiballistic cermets preparation

The paper aims to demonstrate the possibilities of metal-ceramic material deposition on different types of metal or ceramic substrates using plasma deposition. A number of self-supporting components ...

Brožek, Vlastimil; Kubatík, Tomáš František; Chráska, Tomáš; Mušálek, Radek; Janata, Marek; Mastný, L.
Ústav fyziky plazmatu, 2015

Mechanical and chemical properties of plasma sprayed bronze CuAl10 coating on magnesium and magnesium alloy AZ91
Kubatík, Tomáš František; Vilémová, Monika; Mušálek, Radek; Janata, Marek
2015 - English
The most common magnesium alloy AZ91 is widely used as a structural material, but its use is limited at higher temperatures and high humidity. Plasma spraying is a technology that allows to prepare protective metallic and nonmetallic coatings on a wide variety of substrates including magnesium and its alloys. In this study, CuAl10 was plasma sprayed on magnesium and magnesium alloy AZ91 with the aim to study corrosion resistance of the magnesium substrates. The work focuses on optimization of the plasma spraying process, on chemical composition of the coatings, on interface between the coating and substrate, as well as on adhesive strength of the coatings. The coating were deposited after two passes of the spraying torch resulting in thickness of 150 micro m on magnesium substrate and 110 micro m on AZ91 substrate. Chemical microanalysis showed that deposition of CuAl10 alloy on magnesium results in formation of an intermetallic layer at the interface. The layer provides a Keywords: Magnesium alloy AZ91; Plasma spraying Fulltext is available at external website.
Mechanical and chemical properties of plasma sprayed bronze CuAl10 coating on magnesium and magnesium alloy AZ91

The most common magnesium alloy AZ91 is widely used as a structural material, but its use is limited at higher temperatures and high humidity. Plasma spraying is a technology that allows to prepare ...

Kubatík, Tomáš František; Vilémová, Monika; Mušálek, Radek; Janata, Marek
Ústav fyziky plazmatu, 2015

Optické parametry objektivu Secrétan Paris 130/1930 Hvězdárny v Úpici.
Rail, Zdeněk; Melich, Zbyněk
2015 - Czech
Objektiv Secrétan Paris 130/1930 Hvězdárny v Úpici byl na pracovišti ÚFP AV ČR, v.v.i.- TOPTEC vyčištěn a byly proměřeny jeho optické parametry. V referátu uvádíme výsledky matematické simulace zbytkových vad objektivu. The Optical Parameters of Objective Lens Secrétan Paris 130/1930 of Observatory of Úpice Objective lens of Secrétan Paris 130/1930 of Úpice observatory was cleaned a measured its optical parameters in IPP AS CR, v.v.i. - TOPTEC. In this paper we present results of mathematical simulation of residual aberrations of this lens. Keywords: Achromatic doublet; Antonín Bečvář; Chromatic aberration; Lens parameters; Residual optical aberrations; B-F type of chromatic correction; Uncorrected coma Fulltext is available at external website.
Optické parametry objektivu Secrétan Paris 130/1930 Hvězdárny v Úpici.

Objektiv Secrétan Paris 130/1930 Hvězdárny v Úpici byl na pracovišti ÚFP AV ČR, v.v.i.- TOPTEC vyčištěn a byly proměřeny jeho optické parametry. V referátu uvádíme výsledky matematické simulace ...

Rail, Zdeněk; Melich, Zbyněk
Ústav fyziky plazmatu, 2015

Deposition of Fluorocarbon Plasma Polymer Nanoparticles and their Basic Properties
Serov, Anton; Choukourov, A.; Artemenko, A.; Kuzminova, A.; Biederman, H.; Hrabovský, Milan
2015 - English
Fluorocarbon plasma polymer nanoparticles have been fabricated using gas aggregation cluster source (GAS) equipped with a planar magnetron with PTFE target. A beam of nanoparticles 20 – 200 nm in diameter was generated. Fluorocarbon nanoparticle films have shown very good water repellent properties. Films immersed in ethanol for two hours exhibited excellent stability that was also good in case of water. Measurements using a deflection system showed the presence of both neutral and charged nanoparticles. Keywords: poly(tetrafluoroethylene); magnetron sputtering; plasma polymerization; superhydrophobic Fulltext is available at external website.
Deposition of Fluorocarbon Plasma Polymer Nanoparticles and their Basic Properties

Fluorocarbon plasma polymer nanoparticles have been fabricated using gas aggregation cluster source (GAS) equipped with a planar magnetron with PTFE target. A beam of nanoparticles 20 – 200 nm in ...

Serov, Anton; Choukourov, A.; Artemenko, A.; Kuzminova, A.; Biederman, H.; Hrabovský, Milan
Ústav fyziky plazmatu, 2015

Korektor komy D. M. Maksutova
Rail, Zdeněk; Jareš, Daniel; Vápenka, David
2015 - Czech
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. Keywords: Paraboloidal mirror; Coma corrector; Seydel sums; Abbe Sine Condition; Aplanatic system Fulltext is available at external website.
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 ...

Rail, Zdeněk; Jareš, Daniel; Vápenka, David
Ústav fyziky plazmatu, 2015

Unfolding of energies of fusion products measured by the activation probe at JET
Ficker, Ondřej; Mlynář, Jan; Bonheure, G.; Murari, A.; Popovichev, S.
2015 - English
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. Keywords: fusion products; nuclear activation; protons; spectra Fulltext is available at external website.
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 ...

Ficker, Ondřej; Mlynář, Jan; Bonheure, G.; Murari, A.; Popovichev, S.
Ústav fyziky plazmatu, 2015

Fyzikálně astronomické úvahy
Oupický, Pavel
2015 - Czech
Referát je zaměřen na problematické oblasti fyziky a fyzikálně astronomické úvahy The paper is oriented on the problem parts of physic and astronomy physical Keywords: Radiation; antimatter; gravitation; atoms; neutrinos; big bang etc Fulltext is available at external website.
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

Oupický, Pavel
Ústav fyziky plazmatu, 2015

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