Number of found documents: 419
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K problematice řízení klasického typu mikrotronu a využití fuzzy logiky
Krist, Pavel; Bíla, J.
2011 - Czech
Práce se zabývá problematikou řízení klasického typu mikrotronu s Kapitzovým urychlovacím rezonátorem. Zde je využito fuzzy regulátoru. Hlavním problémem, který vede k použití takovéhoto regulátoru, je problematické měření velikosti urychlovacího napětí. Toto napětí musí být nastaveno velmi pečlivě, jinak nedojde ke splnění urychlovacích podmínek. This work deals with control problems of the classical microtron with Kapitza type of the accelerating cavity. Fuzzy controller is used. The main problem, which led to use this type of controller, is a problematical measurement of the radio-frequency electric field inside accelerating cavity. Careful setting of this electric field is necessary for accelerating condition fulfillment. Keywords: Microtron; Electron accelerator; Accelerator controller; Fuzzy logic Available at various institutes of the ASCR
K problematice řízení klasického typu mikrotronu a využití fuzzy logiky

Práce se zabývá problematikou řízení klasického typu mikrotronu s Kapitzovým urychlovacím rezonátorem. Zde je využito fuzzy regulátoru. Hlavním problémem, který vede k použití takovéhoto regulátoru, ...

Krist, Pavel; Bíla, J.
Ústav jaderné fyziky, 2011

Charakteristika neutronových toků na mikrotronu MT25
Chvátil, David; Králik, M.; Granja, C.; Krist, Pavel
2011 - Czech
Mikrotron je malý cyklický urychlovač elektronů. Jestliže má být využit jako zdroj neutronů, urychlené elektrony musí být konvergovány na neutrony pomocí jaderných reakcí. K měření spekter neutronů produkovaných vysokoenergetickým gama zářením v olověném a uranovém terči byla použita sada Bonnerových koulí vybavených pasivními detektory termálních neutronů. Výtěžek neutronů z uranového terče je přibližně dvakrát vyšší než z terče olověného. Microtron is a small cyclic electron accelerator. When it is used as a source of neutrons, electrons must be converted to neutrons by means of nuclear reactions. Spectra of neutrons produced by high energy X-ray photons in lead and uranium targets installed on the microtron MT25 were measured by the Bonner sphere spectrometer with passive detectors of thermal neutrons. Neutron yield from uranium target was nearly two times higher than from the lead one. Keywords: Microtron; electron accelerator; neutron source; U target; Pb target; Bonner sphere; NAA; Mn foil Available at various institutes of the ASCR
Charakteristika neutronových toků na mikrotronu MT25

Mikrotron je malý cyklický urychlovač elektronů. Jestliže má být využit jako zdroj neutronů, urychlené elektrony musí být konvergovány na neutrony pomocí jaderných reakcí. K měření spekter neutronů ...

Chvátil, David; Králik, M.; Granja, C.; Krist, Pavel
Ústav jaderné fyziky, 2011

Emergent Phenomena, Morphomatics and Theory of Complexity
Bíla, J.; Krist, Pavel
2011 - English
This paper is devoted to knowledge and symbolical environments for grasping of emergent phenomena. Respecting the fact that the origin of shapes of nature has its essence in emergencies the paper turns attention to formalisms for direct work with such “shapes” (Morphomatics). There are described three environments for grasping of emergent phenomena especially environment 2 as a cognitive tool and environment 3 as dynamic relation between Macrostructure and Microstructure emphasizing their mutual interactions. As an example of formalism developed from synthesis of the introduced three environments is illustrated the use of theory of matroids (dual of Fano matroid) for case of supergravity D=11. Keywords: emergent phenomena; sign model; semantic space; macrostructure; microstructure; matroids Available at various institutes of the ASCR
Emergent Phenomena, Morphomatics and Theory of Complexity

This paper is devoted to knowledge and symbolical environments for grasping of emergent phenomena. Respecting the fact that the origin of shapes of nature has its essence in emergencies the paper ...

Bíla, J.; Krist, Pavel
Ústav jaderné fyziky, 2011

Residual Stresses Assessment in Coated Materials: Complementarity between Neutron and X-Ray Techniques
Rogante, M.; Mikula, Pavol; Vrána, Miroslav
2010 - English
The residual stress (RS) status induced in the substrate of coated materials by the coating process plays frequently a major role in lending the component’s characteristics. RS assessment can give, thus, a substantial contribution in justifying different cases of failure or else bad performance of coated components due to e.g. the coating delamination or to other occurrences which are not simply interpretable via the conventional mechanical tests or microstructure analyses. The adoption of both neutron diffraction (ND) and X-ray diffraction (XRD) techniques has revealed its usefulness in assessing the RS values in proximity of the coating interface area, respectively, without any layer removal or hole drilling at the extreme surface. Keywords: Polysrystalline materials; Residual stress; Neutron diffraction Available at various institutes of the ASCR
Residual Stresses Assessment in Coated Materials: Complementarity between Neutron and X-Ray Techniques

The residual stress (RS) status induced in the substrate of coated materials by the coating process plays frequently a major role in lending the component’s characteristics. RS assessment can give, ...

Rogante, M.; Mikula, Pavol; Vrána, Miroslav
Ústav jaderné fyziky, 2010

Vyhodnocení úrovně ozáření posádek letadel společnosti ABS JETS, a.s. za rok 2009
Kovář, Ivan; Malušek, Alexandr; Orčíková, Hana; Spurný, František
2010 - Czech
Keywords: individual dosimetry; aircrew exposure; radiation transport codes; kódy; doprava Available at various institutes of the ASCR
Vyhodnocení úrovně ozáření posádek letadel společnosti ABS JETS, a.s. za rok 2009

Kovář, Ivan; Malušek, Alexandr; Orčíková, Hana; Spurný, František
Ústav jaderné fyziky, 2010

Neutron diffraction analysis of residual strain/stress distribution in the vicinity of high strength welds
Mráz, Ľ.; Karlsson, L.; Hamak, I.; Vrána, Miroslav; Mikula, Pavol
2010 - English
Residual stresses resulting from non homogeneous heat distribution during welding process belong to most significant factor influencing behavior of welded structures. These stresses are responsible for defect occurrence during welding and they are also responsible for crack initiation and propagation at the either static or dynamic load. The significant effect of weld metal chemical composition as well as the effect of fatigue load and local plastic deformation on residual stress distribution and fatigue life have been recognized for high strength steels welds. The changes in residual stress distribution have then positive effect on cold cracking behavior and also on fatigue properties of the welds [1-3]. Several experimental methods, both destructive and non-destructive, such as hole drilling method, X-ray diffraction, neutron diffraction and others, have been used to examine residual stress distribution in all three significant orientations in the vicinity of the welds. The present contribution summarizes the results of neutron diffraction measurements of residual stress distribution in the vicinity of single-pass high-strength-steel welds having different chemical composition as well as the influence of fatigue load and local plastic deformation. It has been observed that the chemical composition of the weld metal has a significant influence on the stress distribution around the weld. Similarly, by aplying both cyclic load or pre-stress load on the specimens, stress relaxation was observed even in the region of approximately 40 mm far from the weld toe. Keywords: residual stress; neutron diffraction Available at various institutes of the ASCR
Neutron diffraction analysis of residual strain/stress distribution in the vicinity of high strength welds

Residual stresses resulting from non homogeneous heat distribution during welding process belong to most significant factor influencing behavior of welded structures. These stresses are responsible ...

Mráz, Ľ.; Karlsson, L.; Hamak, I.; Vrána, Miroslav; Mikula, Pavol
Ústav jaderné fyziky, 2010

Multi-(K)over-bar (hyper)Nuclei and Kaon Condensation
Gazda, Daniel; Mareš, Jiří; Friedman, E.; Gal, A.
2010 - English
We report on recent relativistic mean-field calculations of multi-(K) over bar nuclei(1,2) which were performed fully and self-consistently across the periodic table. The (K) over bar separation energy B-(K) over bar as well as the nuclear and (K) over bar -meson densities were found to saturate with the number of antikaons in the nuclear medium. Saturation appears robust against a wide range of variations, including the nuclear model used and the type of boson fields mediating the strong interactions. In addition, we have explored properties of kaonic hypernuclei strange systems made of nucleons, hyperons and K- mesons. We observed saturation also in these objects. Since the (K) over bar separation energy B-(K) over bar does not exceed 200 MeV, multi-(K) over bar nuclei lie energetically well above multi-hyperonic nuclei and it is unlikely that kaon condensation could occur in strong-interaction self-bound hadronic matter. Keywords: Kaonic nuclei; relativistic mean field model; kaon condensation Available at various institutes of the ASCR
Multi-(K)over-bar (hyper)Nuclei and Kaon Condensation

We report on recent relativistic mean-field calculations of multi-(K) over bar nuclei(1,2) which were performed fully and self-consistently across the periodic table. The (K) over bar separation ...

Gazda, Daniel; Mareš, Jiří; Friedman, E.; Gal, A.
Ústav jaderné fyziky, 2010

Návrh postupu experimentálního ověření transportních účinností pro chemické formy 14C a aerosoly na odběrových trasách ventilačních komínů ETE
Světlík, Ivo; Tomášková, Lenka
2010 - Czech
Keywords: 14C; 3H; nuclear power plants; stack air; jaderné elektrárny Available at various institutes of the ASCR
Návrh postupu experimentálního ověření transportních účinností pro chemické formy 14C a aerosoly na odběrových trasách ventilačních komínů ETE

Světlík, Ivo; Tomášková, Lenka
Ústav jaderné fyziky, 2010

Vyhodnocení úrovně ozáření posádek letadel společnosti ČSA a.s. za rok 2009
Kovář, Ivan; Malušek, Alexandr; Orčíková, Hana; Spurný, František
2010 - Czech
Keywords: individual dosimetry; aircrew exposure; radiation transport codes; kódy; doprava Available at various institutes of the ASCR
Vyhodnocení úrovně ozáření posádek letadel společnosti ČSA a.s. za rok 2009

Kovář, Ivan; Malušek, Alexandr; Orčíková, Hana; Spurný, František
Ústav jaderné fyziky, 2010

Vyhodnocení úrovně ozáření posádek letadel společnosti Vojenský útvar 8407 za rok 2009
Kovář, Ivan; Malušek, Alexandr; Orčíková, Hana; Spurný, František
2010 - Czech
Keywords: individual dosimetry; aircrew exposure; radiation transport codes; vojenské útvary; kódy Available at various institutes of the ASCR
Vyhodnocení úrovně ozáření posádek letadel společnosti Vojenský útvar 8407 za rok 2009

Kovář, Ivan; Malušek, Alexandr; Orčíková, Hana; Spurný, František
Ústav jaderné fyziky, 2010

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