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Search Results: 1 - 10 of 4227 matches for " Michal Ková? "
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Change of sedimentary record as a consequence of variation in depth and dynamics of depositional environment (East Slovakian Basin, Middle Miocene)
Jana Hlavatá,Michal Ková?
Acta Geologica Slovaca , 2010,
Abstract: Middle Miocene sedimentary record of VSP-1 borehole situated in the East Slovakian Basin area was studied on well cores and well log diagrams. Documented sedimentary structures provided valuable information about the mode of transport and deposition, as well as about subsequent synsedimentary changes in soft sediment. Different transport mechanisms and depositional environments provide important information on the basin palaeogeography during the Serravalian (Upper Badenian and Lower Sarmatian regional stages), since the depositional environment in the study area changed from the deeper neritic environment of basin slope or lower part of the delta slope to the shallow neritic to littoral, coastal or delta plain environment. Deep water setting is characterized mainly by fine-grained sediments of gravity flows with slumps, showing grain flow to turbidity current features. The typical sedimentary structures are: erosive base of beds, normal grading, etc. Sediments are usually disturbed by synsedimentary deformations as slumps and growth faults. Shallow water setting was identified on the basis of specific sedimentary structures as: planar cross and trough cross bedding, ripple marks, hummocky cross stratification, flaser, wave and lenticular bedding. These sedimentary structures originated in shallow water, high energy environment, but each of them at different dynamic condition. Results obtained by the study of sedimentary record of the VSP-1 borehole fit well with the Upper Badenian and Lower Sarmatian palaeogeographical models of Vass et al. (2002) and confirm the rightness of defined changes of depositional environment in the Trebi ov Depression of the East Slovakian Basin in time and space.
Technogeneous mineral wastes source of raw materials
Michalíková Franti?ka
Acta Montanistica Slovaca , 1998,
Abstract: The electron microanalysis is used for the evaluation of properties of the technogeneous mineral wastes - the Jel ava waste sands. In the contribution flotation results of the given waste are presented prognosticating a high-quality magnesite concentrate from it. The acquired knowledge, can be rationally used also as a factographic material for explaining the unsuitable wet treatment and, at the same time, it can serve for the proper formulation and construction of other possible technological solutions.
Energetical wastes mineral resources
Michalíková Franti?ka
Acta Montanistica Slovaca , 1999,
Abstract: The production of energetical wastes in Slovakia is mainly disposed and only 15-20 % is utilized in the production of building materials. From the knowledge of their physical, chemical and mineralogical properties a complex utilization by proper technologist can be analyzed.
Energetical fly ashes separation and utilization of metallic valuable components
Michalíková Franti?ka
Acta Montanistica Slovaca , 2000,
Abstract: In the contribution, methods of separating metals Fe, Al, Ge from energetic wastes fly ashes are presented along with further possibilities of utilization of particular valuable components for industrial purposes.In the contribution, properties of energetic wastes are presented influencing the contents, separability, and utilizability of metal-bearing valuable components. From among physical properties these are grain size distribution and surface area. Chemical properties are characterized by elements contained in combusted coal whose content after combustion is increased 2 to 4 times, depending on the content of ash and combustible matters in original coal. Mineralogical properties of energetic wastes are determined by the combustion process conditions in the course of which mineral novelties are produced in concentrations suitable for separation.In the contribution, methods of separation and utilization of metals such as Fe, Al, Ge are described. From literature information on the processing of Fe component, as well as from results of experiments made at the Department of Mineral Processing and Environmental Protection, Technical University of Kosice follows that the highest concentration and mass yield of the component can be obtained from black coal fly ashes produced in smelting boilers. The content of Al in Slovak energetic wastes is lower than the 30 % Al2O3 limit that conditions an economic technological processing. Only in the case of black coal fly ash from TEKO Kosice and EVO Vojany was the Al2O3 content of 32.93 %. Therefore, in an indirect way by separating the residues of uncombusted coal and magnetite Fe the content of Al in fly ash was increased.For Ge, a principle of selective sizing has been utilized.A complex utilization of energetic wastes, that is the separation of metallic components, elimination of particular metals and the subsequent treatment of nonmetallic residue, should be an effective solution in various industrial areas.
Měkky i PR Peliny u Chocně Molluscs of the Peliny Natural Reserve near Choceň (East Bohemia, Czech Republic)
Lucie Ju?i?ková,Michal Horsák,Magda Hrabáková
Malacologica Bohemoslovaca , 2006,
Abstract: This paper brings a review of a long-term malacological survey of Peliny, an important Nature Reserve near Choceň town (East Bohemia, Czech Republic). Altogether, 50 mollusc species have been recorded during the last 100 years (representing 21% of the total Czech mollusc fauna). The isolated populations of the East-Alpine Cochlodina commutata, Itala ornata, and Pupilla sterrii were confirmed. The last mentioned species has a single site there within the East Bohemia. Rare woodland species Platyla polita, Daudebradia rufa, and Vertigo alpestris were recorded for the first time.
Integration of environmental approaches to strategy of production enterprises - environmentally oriented quality of production
Floreková ?ubica,Maras Michal,Michalíková Franti?ka
Acta Montanistica Slovaca , 2001,
Abstract: In the paper there are presented system approaches, applied in Slovak transformed production enterprises, which solve questions of closing the so called industrial cycle from the side of the wastes' producers. The production quality is connected not only with the technological chain itself and with outputs from it - the utility product, but also with the load of the life environment.The presented possibilities of the liquidation of solid energetic waste fly ashes represent a an overview of forms and methods of its utilization. By combusting one kind of coal in various boilers, fly ashes with different physical, chemical, and mineralogical properties originate, with the combustion temperature as a dominant factor. The fly ashes are directly (without influencing its composition) applied in civil engineering, mining, metallurgy, waste water cleaning, etc. Their utilization after a separation removal of unwanted components is an economically difficult process. Such a unvaluable component is coal combustion residue, evaluated by the annealing loss (carbon-in-ash loss) in fly ashes used for special procedures in civil enginering, e.g. in mortars (maximally 4% of c.a.s. loss) or in the porous concrete (4-7% of c.a.s. loss). The building industry processes about 20% of solid energetic waste.
Roots of angiosperm formins: The evolutionary history of plant FH2 domain-containing proteins
Michal Grunt, Viktor ?ársky, Fatima Cvr?ková
BMC Evolutionary Biology , 2008, DOI: 10.1186/1471-2148-8-115
Abstract: The Rho GTPase-binding domain (GBD/FH3) reported from opisthokont and Dictyostelium formins was found in all lineages except plants, suggesting its ancestral character. Instead, mosses and vascular plants possess the two formin classes known from angiosperms: membrane-anchored Class I formins and Class II formins carrying a PTEN-like domain. PTEN-related domains were found also in stramenopile formins, where they have been probably acquired independently rather than by horizontal transfer, following a burst of domain rearrangements in the chromalveolate lineage. A novel RhoGAP-related domain was identified in some algal, moss and lycophyte (but not angiosperm) formins that define a specific branch (Class III) of the formin family.We propose a scenario where formins underwent multiple domain rearrangements in several eukaryotic lineages, especially plants and chromalveolates. In plants this replaced GBD/FH3 by a probably inactive RhoGAP-like domain, preserving a formin-mediated association between (membrane-anchored) Rho GTPases and the actin cytoskeleton. Subsequent amplification of formin genes, possibly coincident with the expansion of plants to dry land, was followed by acquisition of alternative membrane attachment mechanisms present in extant Class I and Class II formins, allowing later loss of the RhoGAP-like domain-containing formins in angiosperms.Domain shuffling in modular proteins is considered one of the major sources of evolutionary innovation [1]. Phylogenetic studies of signaling and regulatory proteins exhibiting variable domain composition can provide important contributions towards understanding the basis of the current diversity of life.Formins (or FH2 domain-containing proteins) may serve as a good example of an ancient protein family with a likely role in morphogenesis (at least on the cellular level) whose evolution included extensive domain rearrangements. The well-conserved FH2 (formin homology 2) domain [Smart: SM00498, Interpro: IPR015425,
Monitoring of Biodiversity Changes in the Landscape Scale
Du an Romportl , , Michal Andreas , Blanka Vlasáková
Journal of Landscape Ecology , 2008, DOI: 10.2478/v10285-012-0005-4
Abstract: The monitoring and evaluation of changes in biodiversity is a subject for many biological and ecological disciplines. Biodiversity loss has become a social and political issue over the last few decades, and protection of biological diversity has emerged as one of the main subjects within national nature conservation policies as well as international conventions, conservation targets and political programmes (e.g. the Convention on Biological Diversity, Target 2010, SEBI 2010, CITES, Ramsar Convention, European Landscape Convention). The establishment of a monitoring scheme based on an appropriate set of indicators is vital for precise assessment of the effectiveness of measures applied within biodiversity protection (e.g. action plans for endangered species, agro-environmental and landscape protection programmes). Many indicators of biodiversity change have been proposed, but their representativeness and applicability frequently suffer from poor available data or local circumstances. The concept of species and landscape diversity evaluation using a fixed set of indicators has been developing in other European countries for some two decades, but this approach is still sporadic in the Czech Republic. This paper provides a review of the current state of this topic in the Czech Republic, discusses the concept of establishing a future national biodiversity monitoring network, and proposes a self-contained set of indicators covering all organizational and spatial levels. These proposals will enable scientifically based and sufficiently accurate evaluation of existing trends in biodiversity and its projection into the future based on foreseeable land-use changes.
Possibilities of utilization of fly ash from the black coal Power Engineering of the U. S. Steel Ko ice
Vladimír Jacko,Franti?ka Michalíková
Acta Montanistica Slovaca , 2005,
Abstract: The paper presents modes of a direct utilization of the fly ash by-product of the combustion of black power coal in the slag - bottom boilers of the Division Plant Power Engineering ( DP PE ) of the U. S. Steel Ko ice ( next USSK ). The properties of fly ash limit its use in metallurgy and foundry industry. The fly ash is directly utilizable in the metallurgical industry as a component of powder cover mixtures and insulation inserts, heat insulation parts and exothermical mixtures. The most important components in the mixtures are light micro spheres – cenospheres and heavy micro spheres – plerospheres. The micro spheres significantly improve properties of the powder cover mixtures.
Application of magnetic sorbent in the removal of cadmium from soils
Michal Lovás,Milota Ková?ová
Acta Montanistica Slovaca , 2006,
Abstract: A contamination of soil by heavy metals is a common problem at many metalliferous mining sites. There are various treatment processes for the cleanup of soil contaminated with heavy metals. A method designed for the decontamination of soil polluted by Cd is described. The method utilizes a magnetic sorbent – sludges from the hydrometallurgic processing of nickel mineral, activated by milling. The influence of sorbent concentration, pH and microwave energy on the sorption capacity and content of Cd ions in a soil was studed. The effectiveness of Cd desorption from the soil was 75 %, the maximal sorption capacity of sorbent was 9,8 mg/g. The content of Cd in water is function of pH and the concentration of sorbent. The influence of microwave energy (90 W) was negligible.
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