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Search Results: 1 - 10 of 401616 matches for " M Vitácková "
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Resensie: "Kelder"
M Vitácková
Tydskrif vir letterkunde , 2013,
Abstract: Kelder. Gerda Taljaard. Kaapstad: Tafelberg, 2012. 224 pp. ISBN: 978-0-624-05431-3.
In search of adventure: Ladislav Mike Parízek, a Czech in the Congo
M Vitácková
Tydskrif vir letterkunde , 2009,
Abstract: Ladislav Mike Parízek's books, articles and lectures had a large impact on the image of the Congo as it existed in communist Czechoslovakia from the 1940s till the 1970s, but this Czech traveller and writer has almost been forgotten. Through an analysis of his works and of reviews of these works published in newspapers of the 1950s, the nature of the African discourse as it was created in communist Eastern Europe, as well as the (mis)use of this discourse by the ruling party, is revealed. Special attention will be paid to the illustrations accompanying his books, articles and lectures.
Melting of andesite in a microwave oven
Znamenácková I.,Lovás M.,Hájek M.,Jakabsky ?.
Journal of Mining and Metallurgy, Section B : Metallurgy , 2003, DOI: 10.2298/jmmb0304549z
Abstract: The positive influence of the microwave radiation on the melting of rocks is described. Local melting-down of specimens and subsequent flowing-out of red-hot magmatic mass was observed when andesite samples from the location of Ruskov (Slovakia) were heated in a microwave own with an output of 900 W. After 30 min of microwave heating of an andesite specimen of defined dimensions, its complete melting was observed and the temperature measured reached the range of 1260-1280°C.
On Empirical Entropy
Paul M. B. Vitányi
Mathematics , 2011,
Abstract: We propose a compression-based version of the empirical entropy of a finite string over a finite alphabet. Whereas previously one considers the naked entropy of (possibly higher order) Markov processes, we consider the sum of the description of the random variable involved plus the entropy it induces. We assume only that the distribution involved is computable. To test the new notion we compare the Normalized Information Distance (the similarity metric) with a related measure based on Mutual Information in Shannon's framework. This way the similarities and differences of the last two concepts are exposed.
Study of Ce0.9Tb0.05Ln0.05O1.975 compounds as ceramic pigments
?ulcová P.,Vitásková L.,Trojan M.
Journal of Mining and Metallurgy, Section B : Metallurgy , 2008, DOI: 10.2298/jmmb0801083s
Abstract: New inorganic pigments based on CeO2 were synthesized as high-temperature Environment friendly inorganic pigments. This work is focused on mixed oxides based on ceria which are doped by rare earth elements, i.e. compounds with formula Ce0.9Tb0.05Ln0.05O1.975, where Ln means lanthanides. The pigments were prepared by the solid state reaction. Their colour properties were investigated depending on content of selected lanthanides and calcination temperature. All prepared pigments were applied into organic matrix and ceramic glaze. The pigments were evaluated from the standpoint of their structure, colour properties and particle sizes.
Euclidean Distance between Two Linear Varieties
M. A. Facas Vicente,Armando Gon?alves,José Vitória
Mathematics , 2013,
Abstract: This paper addresses to the problem of ?nding the (minimum) Euclidean distance between two linear varieties. This problem is, usually, solved minimising a target function. We propose a novel approach: to use the Moore-Penrose generalised inverse of a matrix in order to ?nd the Euclidean distance and, at the same time, going further by exhibiting the best approximation pair of points.
Optimal Pair of Two Linear Varieties
Armando Gon?alves,M. A. Facas Vicente,José Vitória
Mathematics , 2013,
Abstract: The optimal pair of two linear varieties is considered as a best approximation problem, namely the distance between a point and the di?erence set of two linear varieties. The Gram determinant allows to get the optimal pair in closed form.
The Caffarelli-Kohn-Nirenberg Inequality for Submanifolds in Riemannian Manifolds
Márcio Batista,Heudson Mirandola,Feliciano Vitório
Mathematics , 2015,
Abstract: After works by Michael and Simon [10], Hoffman and Spruck [9], and White [14], the celebrated Sobolev inequality could be extended to submanifolds in a huge class of Riemannian manifolds. The universal constant obtained depends only on the dimension of the submanifold. A sort of applications to the submanifold theory and geometric analysis have been obtained from that inequality. It is worthwhile to point out that, by a Nash Theorem, every Riemannian manifold can be seen as a submanifold in some Euclidean space. In the same spirit, Carron obtained a Hardy inequality for submanifolds in Euclidean spaces. In this paper, we will prove the Hardy, weighted Sobolev and Caffarelli-Kohn-Nirenberg inequalities, as well as some of their derivatives, as Galiardo-Nirenberg and Heisenberg-Pauli-Weyl inequalities, for submanifolds in a class of manifolds, that include, the Cartan-Hadamard ones.
Language learning from positive evidence, reconsidered: A simplicity-based approach
Anne S. Hsu,Nick Chater,Paul M. B. Vitányi
Computer Science , 2013,
Abstract: Children learn their native language by exposure to their linguistic and communicative environment, but apparently without requiring that their mistakes are corrected. Such learning from positive evidence has been viewed as raising logical problems for language acquisition. In particular, without correction, how is the child to recover from conjecturing an over-general grammar, which will be consistent with any sentence that the child hears? There have been many proposals concerning how this logical problem can be dissolved. Here, we review recent formal results showing that the learner has sufficient data to learn successfully from positive evidence, if it favours the simplest encoding of the linguistic input. Results include the ability to learn a linguistic prediction, grammaticality judgements, language production, and form-meaning mappings. The simplicity approach can also be scaled-down to analyse the ability to learn a specific linguistic constructions, and is amenable to empirical test as a framework for describing human language acquisition.
Bone Health in Patients with Multiple Sclerosis
Vit Zikan
Journal of Osteoporosis , 2011, DOI: 10.4061/2011/596294
Abstract: Multiple sclerosis (MS) is a gait disorder characterized by acute episodes of neurological defects leading to progressive disability. Patients with MS have multiple risk factors for osteoporotic fractures, such as progressive immobilization, long-term glucocorticoids (GCs) treatment or vitamin D deficiency. The duration of motor disability appears to be a major contributor to the reduction of bone strength. The long term immobilization causes a marked imbalance between bone formation and resorption with depressed bone formation and a marked disruption of mechanosensory network of tightly connected osteocytes due to increase of osteocyte apoptosis. Patients with higher level of disability have also higher risk of falls that combined with a bone loss increases the frequency of bone fractures. There are currently no recommendations how to best prevent and treat osteoporosis in patients with MS. However, devastating effect of immobilization on the skeleton in patients with MS underscores the importance of adequate mechanical stimuli for maintaining the bone structure and its mechanical competence. The physical as well as pharmacological interventions which can counteract the bone remodeling imbalance, particularly osteocyte apoptosis, will be promising for prevention and treatment of osteoporosis in patients with MS.
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