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9212. Some topological properties of $\omega$-covering sets
- Creator:
- Nowik, Andrzej
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- ${\omega }$-covering set, ${\mathcal E}$, and hereditarily nonparadoxical set
- Language:
- English
- Description:
- We prove the following theorems: There exists an ${\omega }$-covering with the property $s_0$. Under $\mathop {\mathrm cov}\nolimits ({\mathcal N}) = $ there exists $X$ such that $ \forall _{B \in {\mathcal B}or} [B\cap X$ is not an ${\omega }$-covering or $X\setminus B$ is not an ${\omega }$-covering]. Also we characterize the property of being an ${\omega }$-covering.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
9213. Sorption of alkylammonium cations on montmorillonite
- Creator:
- Navrátilová, Zuzana, Wojtowicz, Petr, Lenka Vaculíková, and Šugárková, Věra
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, adsorpce, montmorillonit, adsorption, montmorillonite, hexadecyltrimethylammonium, benzyldimethylhexadecylammonium, 7, and 551
- Language:
- English
- Description:
- Adsorption procedure of two cationic surfactants hexadecyltrimethylammonium bromide (HDTMABr) and benzyldimethylhexadecylammonium chloride (BDHDACl) onto two samples of montmorillonite was studied. Infrared spectroscopy and X-ray diffraction proved intercalation of both quaternary cations into the interlayer space of montmorillonite. An aspect of time showed not to be important for the cations adsorption., Zuzana Navrátilová, Petr Wojtowicz, Lenka Vaculíková and Věra Šugárková., and Obsahuje bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
9214. Sorption of heavy metals on lignite impregnated with chitosan
- Creator:
- Havelcová, Martina, Jiří Mizera, Machovič, Vladimír, Borecká, Lenka, Oldřich Přibyl, and Krausová, Ivana
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, hnědé uhlí, chitosan, těžké kovy, sorpce, lignite, heavy metals, sorption, INAA, 7, and 551
- Language:
- English
- Description:
- A combined sorbent was prepared by impregnation of lignite mined in the South Moravian Coalfield, Czech Republic, with chitosan. Sorption performance of the combined sorbent and the untreated lignite was tested for Co(II), Cu(II), and Cd(II) in equilibrium sorption experiments with respect to pH and metal concentration. The amount of metal retained by the sorbent was determined by instrumental neutron activation analysis in the short time irradiation mode with epithermal neutrons. For pH~5, sorption isotherms were determined and fitted using the Langmuir and Freundlich models. The results have been compared with those obtained previously for similar combined sorbent based on naturally oxidized coal mined in the Sokolov Basin, Czech Republic. It has been shown that the effect of chitosan on sorption efficiency of the chitosan-doped coal sorbents strongly depends on solution pH, and type of coal and metal., Martina Havelcová, Jiří Mizera, Vladimír Machovič, Lenka Borecká, Oldřich Přibyl and Ivana Krausová., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
9215. Soupisy duší v královéhradecké diecézi z let 1776-1777 jako demografické prameny a okolnosti jejich vzniku
- Creator:
- Pavlík, Jiří and Pokorný, Radek
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- česká a uherská královna, císařovna, choť Františka Štěpána I., římskoněmeckého císaře, Marie Terezie, 1717-1780, Katolická církev., Diecéze královéhradecká, demografie, duchovní, heretici, demography, clergymen, heretics, soupisy duší, selské povstání, register of souls, peasants' revolt, 8, and 94(437)
- Language:
- Czech and English
- Description:
- The authors aimed to elucidate the circumstances surrounding the compilation of registers of souls in the diocese of Hradec Kralové, in the northeast of Bohemia, in the years 1776 and 1777. They also analysed the three extant registers as demographic sources for the study of the population of the day. The resulting data indicate that in the second half of the 18th century, the state had a considerable influence on how the registers of souls were kept and compiled in the Hradec Kralové diocese, and used them to obtain important information on the population, particularly in matters of religion. The volumes containing the registers of souls in 1776-77 represent an extremely valuable source from a demographic point of view that can be used not only to ascertain the numerical state of the population of a particular locality at the time of their compilation, but to study its age profile, social stratification and the typology of families and households., Jiří Pavlík a Radek Pokorný., and Obsahuje bibliografické odkazy
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
9216. Sources of EEG activity most relevant to performance of brain-computer interface based on motor imagery
- Creator:
- Frolov , Alexander, Húsek, Dušan, Bobrov, Pavel, Korshakov , Alexey, Chernikova , Lyudmila, Konovalov , Rodion , and Makienko , Olesya
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Brain-computer interface, independent component analysis, pattern classification, motor imagery, inverse problem, fMRI, and EEG
- Language:
- English
- Description:
- The paper examines sources of brain activity, contributing to EEG patterns which correspond to motor imagery during training to control brain-computer interface. To identify individual source contribution into electroencephalogram recorded during the training Independent Component Analysis was used. Then those independent components for which the BCI system classification accuracy was at maximum were treated as relevant to performing the motor imagery tasks, since they demonstrated well exposed event related de-synchronization and event related synchronization of the sensorimotor μ-rhythm during imagining of contra- and ipsilateral hand movements. To reveal neurophysiological nature of these components we have solved the inverse EEG problem to locate the sources of brain activity causing these components to appear in EEG. The sources were located in hand representation areas of the primary sensorimotor cortex. Their positions practically coincide with the regions of brain activity during the motor imagination obtained in fMRI study. Individual geometry of brain and its covers provided by anatomical MR images was taken into account when localizing the sources.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
9217. Sources of statistical discrimination: experimental evidence from Georgia
- Creator:
- Kudashvili, Nikoloz
- Publisher:
- CERGE-EI
- Format:
- electronic, bez média, svazek, and 41 stran : ilustrace.
- Type:
- model:monograph and TEXT
- Subject:
- Ekonomie, trhy, diskriminace, experimentální ekonomie, markets, discrimination, experimental economics, statistická diskriminace, 339.13, 316.647.82, 33-028.77, (048.8), 4, and 33
- Language:
- English and Czech
- Description:
- Nikoloz Kudashvili., Obsahuje bibliografii a bibliografické odkazy, and České a anglické resumé
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
9218. Southern hospitality?: Czechoslovak relations with Africa until 1989
- Creator:
- Johnston, Rosamund
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Language:
- English
- Description:
- Autor recenze: Rosamund Johnston
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
9219. Spaces with large relative extent
- Creator:
- Song, Yan-Kui
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- relative topological property, Lindelöf, star-Lindelöf, relative extent, and relative property (a)
- Language:
- English
- Description:
- In this paper, we prove the following statements: (1) For every regular uncountable cardinal $\kappa $, there exist a Tychonoff space $X$ and $Y$ a subspace of $X$ such that $Y$ is both relatively absolute star-Lindelöf and relative property (a) in $X$ and $e(Y,X) \ge \kappa $, but $Y$ is not strongly relative star-Lindelöf in $X$ and $X$ is not star-Lindelöf. (2) There exist a Tychonoff space $X$ and a subspace $Y$ of $X$ such that $Y$ is strongly relative star-Lindelöf in $X$ (hence, relative star-Lindelöf), but $Y$ is not absolutely relative star-Lindelöf in $X$.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
9220. Sparse distributed memory - modifications of initialization
- Creator:
- Grebeníček, František
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- neural nets, associative memory, and Sparse Distributed Memory
- Language:
- English
- Description:
- This paper is concentrated on the Kanerva’s Sparse Distributed Memory as a kind of artificial rieural net and associative memory. SDM eaptures some basic properties of human long-term memory. SDM may be regarded as a three-layered feed-forward neural net. Input layer neurons copy input vectors only, hidden layer neurons have radial basis functions and output layer neurons have linear basis functions. The hidden layer is initialized randomly in the basic SDM algorithm. The aim of the paper is to study of Kanerva’s model behaviour for reál input data (largge input vectors, correlated data). A modification of the basic model is introduced and tested.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public