No (954)
Number of found documents:
954
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to
Study on polishing of ZnSe with diamond suspension
Procháska, František; Thoř, Tomáš
2018 - English
Observe the effect of diamond slurries as polishing element on ZnSe, i.e. observe the change of surface of ZnSe as consequence to the series of polishing with the use of mentioned diamond slurries.
Keywords:
ZnSe polishing; Diamond polishing slurry
Available at various institutes of the ASCR
Study on polishing of ZnSe with diamond suspension
Observe the effect of diamond slurries as polishing element on ZnSe, i.e. observe the change of surface of ZnSe as consequence to the series of polishing with the use of mentioned diamond slurries.
Feedhorn Coating - research report
Václavík, Jan
2017 - English
The report contains a description of the developed methods for metalizing of prototype of the FEEDHORN demonstrator, which is made up of a specially shaped carbon fiber composite carrier and a CNT layer. The report contains the results and comments for future construction of similar types of devices.
Keywords:
cnt layer; metalization; vacuum evaporation
Available at various institutes of the ASCR
Feedhorn Coating - research report
The report contains a description of the developed methods for metalizing of prototype of the FEEDHORN demonstrator, which is made up of a specially shaped carbon fiber composite carrier and a CNT ...
Chemical and microstructural characterization of the render, sampled from Gloriette, the US Embassy in Prague 1
Slížková, Zuzana; Frankeová, Dita; Viani, Alberto; Hauková, Petra; Koudelková, Veronika; Svoboda, Milan
2017 - English
The aim of the work was to analyze the mortar taken from the Gloriette (US Embassy, Prague 1). Analyzes were performed for the binder and filler characterization and the sample was also dissolved in HCl to determine the mixing ratio.
Keywords:
survey; material characterization; chemical composition; binder and aggregate characterization
Available at various institutes of the ASCR
Chemical and microstructural characterization of the render, sampled from Gloriette, the US Embassy in Prague 1
The aim of the work was to analyze the mortar taken from the Gloriette (US Embassy, Prague 1). Analyzes were performed for the binder and filler characterization and the sample was also dissolved in ...
Paleomagnetic research of the fill in the Kalacka Cave, Poland. Final report. Catalogue of primary paleomagnetic data.
Pruner, Petr; Čížková, Kristýna; Kdýr, Šimon
2017 - English
Keywords:
palaeomagnetism; caves; Kalacka Cave, Poland
Available at various institutes of the ASCR
Paleomagnetic research of the fill in the Kalacka Cave, Poland. Final report. Catalogue of primary paleomagnetic data.
Semigroup Structure of Sets of Solutions to Equation X^s = X^m
Porubský, Štefan
2017 - English
Using an idempotent semigroup approach we describe the semigroup and group structure of the set of solutions to equation X^m = X^s in successive steps over a periodic commutative semigroup, over multiplicative semigroups of factor rings of residually finite commutative rings and finally over multiplicative semigroups of factor rings of residually finite commutative principal ideal domains. The analysis is done through the use of the maximal subsemigroups and groups corresponding to an idempotent of the corresponding semigroup and in the case of residually finite PID’s employing the available analysis of the Euler-Fermat Theorem as given in [11]. In particular the case when this set of solutions is a union of groups is handled. As a simple application we show a not yet noticed group structure of the set of solutions to x^n = x connected with the message space of RSA cryptosystems and Fermat pseudoprimes.
Keywords:
set of solutions; idempotent; maximal semigroup corresponding to an idempotent; maximal group corresponding to an idempotent; equation X^s = X^m; finite commutative ring with identity element; residually finite commutative principal ideal domains
Available on request at various institutes of the ASCR
Semigroup Structure of Sets of Solutions to Equation X^s = X^m
Using an idempotent semigroup approach we describe the semigroup and group structure of the set of solutions to equation X^m = X^s in successive steps over a periodic commutative semigroup, over ...
Research report 2013-11-18 Calcite SSS6
Kumpová, Ivana; Vopálenský, Michal; Vavřík, Daniel
2017 - English
Porosity was measured on a irregular sample of calcite, designated Calcite_SSS6, using the TORATOM device in the Centre of Excellence Telč.
Keywords:
calcite; TORATOM; measuring
Available at various institutes of the ASCR
Research report 2013-11-18 Calcite SSS6
Porosity was measured on a irregular sample of calcite, designated Calcite_SSS6, using the TORATOM device in the Centre of Excellence Telč.
Idempotents, Group Membership and their Applications
Porubský, Štefan
2017 - English
S.Schwarz in his paper [165] proved the existence of maximal subgroups in periodic semigroups and a decade later he brought [167] into play the maximal subsemigroups and thus he embodied the idempotents in the structural description of semigroups. Later in his papers he showed that a proper description of these structural elements can be used to (re)prove many useful and important results in algebra and number theory. The present paper gives a survey of selected results scattered throughout the literature where an semigroup approach based on tools like idempotent, maximal subgroup or maximal subsemigroup either led to a new insight into the substance of the known results or helped to discover new approach to solve problems. Special attention will be given to some disregarded historical connections between semigroup and ring theory.
Keywords:
multiplicative semigroup; finite semigroups; power semigroups; idempotent elements; finite commutative rings; principal ideal domain; Euler-Fermat theorem; Wilson theorem; matrices over fields; maximal groups contained in a semigroup; periodic sequence; multiplicative semigroup of Zm; semigroup of circulant Boolean matrices
Available on request at various institutes of the ASCR
Idempotents, Group Membership and their Applications
S.Schwarz in his paper [165] proved the existence of maximal subgroups in periodic semigroups and a decade later he brought [167] into play the maximal subsemigroups and thus he embodied the ...
Comprehensive geological characterization of URF Bukov – part II Geotechnical characterization.
Souček, Kamil; Vavro, Martin; Staš, Lubomír; Kaláb, Zdeněk; Koníček, Petr; Georgiovská, Lucie; Kaláb, Tomáš; Konečný, Pavel; Kolcun, Alexej; Králová, Lucie; Kubina, Lukáš; Lednická, Markéta; Malík, Josef; Martinec, Petr; Ptáček, Jiří; Vavro, Leona; Waclawik, Petr; Zajícová, Vendula
2017 - English
This final report was processed as a part of Radioactive Waste Repository Authority project Research support for safety evaluation of the deep repository, which is a part of the preparation for the deep repository of nuclear waste (further DR). The aims of the project were collection and interpretation of geological data, the creation of models and obtaining information necessary for evaluation of potential sites for DR emplacement regarding long-term safety. On the basis of public submitting act, a 4-year contract was signed with ÚJV Řež, a.s. and its subcontractors: Czech Geological Survey, Czech Technical University in Prague, Technical University in Liberec, Institute of Geonics of Czech Academy of Sciences, and companies Arcadis CZ, Progeo, Chemcomex Praha and Centre for Research Řež about providing research support for evaluation of long-term safety.
Keywords:
spent nuclear fuel; nuclear waste; behaviour of rock environment; radionuclide transport; safety of repository
Available on request at various institutes of the ASCR
Comprehensive geological characterization of URF Bukov – part II Geotechnical characterization.
This final report was processed as a part of Radioactive Waste Repository Authority project Research support for safety evaluation of the deep repository, which is a part of the preparation for the ...
Earth-space path propagation characteristics in the climatic conditions of the Czech Republic from Alphasat Ka/Q band experiment
Fišer, Ondřej; Brázda, Vladimír; Pešice, Petr; Grabner, M.
2017 - English
The objective of the activity is to prepare, realize and conduct experimental research of the influence of atmospheric phenomena on the Earth-space path propagation characteristics at 20 and 40 GHz (Ka/Q) bands in the specific climatic conditions of the Czech Republic (CR). The scientific approach is based on the comprehensive measurements of physical parameters of atmosphere together with concurrent measurements of propagation characteristics on the Earth-space path and on 10 collocated terrestrial paths with star configuration. The proposed activity will utilize the ESA Alphasat Mission Ka/Q experiment that is designed to investigate the propagation characteristics on slant paths in Europe and elsewhere.
Keywords:
satellite communication; atmosphere; atmospheric attenuation; propagation characteristics
Available at various institutes of the ASCR
Earth-space path propagation characteristics in the climatic conditions of the Czech Republic from Alphasat Ka/Q band experiment
The objective of the activity is to prepare, realize and conduct experimental research of the influence of atmospheric phenomena on the Earth-space path propagation characteristics at 20 and 40 GHz ...
Unsteady Measurement on Valve I
Šimurda, David; Hála, Jindřich; Luxa, Martin
2017 - English
Report contains results and evaluation of unsteady pneumatic measurements contucted on the valve system.
Keywords:
control valve; unsteady flow; control characteristics
Available at various institutes of the ASCR
Unsteady Measurement on Valve I
Report contains results and evaluation of unsteady pneumatic measurements contucted on the valve system.
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