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K-Ar dating of basic intrusions at Bellsund, Spitsbergen, Svalbard
Krzysztof Birkenmajer , Krzysztof P. Krajewski , Zoltán Pécskay , Marek W. Lorenc
Polish Polar Research , 2010, DOI: 10.4202/ppres.2010.01
Abstract: Nine samples of basic (dolerite, gabbro) intrusions collected at Bellsund, South Spitsbergen, have been K-Ar dated. Three dates, between 87.8 and 102.9 Ma, obtained from dolerite sills which intrude Carboniferous and Permian deposits in Van Keulenfjorden point to a Cretaceous age of intrusive activity (Diabasodden Suite). The K-Ar dates obtained from dolerite and gabbro which intrude Upper Proterozoic metasedimentary terrane of Chamber-lindalen form two groups: the dates between 97.1 and 178.6 Ma point to a Mesozoic age of the intrusions (Diabasodden Suite); the dates from a tectonized gabbroid (280.9-402.0 Ma) might point to a Late Palaeozoic age of the intrusion. No K-Ar dates which would indicate a Proterozoic age of the basic intrusions were obtained.
Geochronology of the Neogene calc-alkaline intrusive magmatism in the "Subvolcanic Zone" of the Eastern Carpathians (Romania)
Zoltán Pécskay, Ioan Seghedi, Marinel Kovacs, Alexandru Szakács, , Alexandrina Fül p
Geologica Carpathica , 2009, DOI: 10.2478/v10096-009-0012-5
Abstract: The Poiana Botizei- ible -Toroiaga-Rodna-Bargau intrusive area (PBTTRB), northwest Romania, known as the "Subvolcanic Zone", is located between the Gutai (NW) and Calimani (SE) volcanic massifs. It consists of rocks displaying a wide range of compositions and textures: equigranular or porphyritic with holocrystalline groundmass (gabbro-diorites, diorites, monzodiorites and granodiorites), and/or porphyritic with fine holocrystalline or glassycryptocrystalline groundmass, similar with effusive rocks: basalts, basaltic andesites, andesites, dacites and rhyolites. The time-span of intrusive rocks emplacement is similar with the nearest calc-alkaline volcanic rocks from Gutai (NW) and Calimani (SE) massifs. They are represented by stocks, laccoliths, dykes and sills typical for an upper crustal intrusive environment. In the absence of biostratigraphic evidence, a comprehensive K-Ar study of intrusive rocks using whole rock samples, groundmass and monomineral fractions (biotite, hornblende) has been carried out in order to understand the magmatic evolution of the area. The oldest K-Ar ages recorded in the analysed rocks are close to 11.5 Ma and magmatism continued to develop until about 8.0 Ma. The inception of intrusion emplacement in the PBTTRB is coeval with intrusive activity spatially related to volcanism within the neighbouring Gutai and Calimani massifs. However, its culmination at ca. 8 Ma ago is younger than the interruption of this activity at ca. 9.2 Ma in Gutai and Calimani Mts where intrusive activity resumed for ca. 1 Myr. These circumstances strongly suggest that the geodynamic evolution of the area controlled the development of both volcanic and intrusive activity and their reciprocal relationships. The overall geological data suggest that in the PBTTRB intra-lithospheric transpressional-transtensional tectonic processes controlled the generation and emplacement of intrusive bodies between ca. 12-8 Ma.
Dolerites of Svalbard, north-west Barents Sea Shelf: age, tectonic setting and significance for geotectonic interpretation of the High-Arctic Large Igneous Province
Krzysztof Nejbert,Krzysztof P. Krajewski,Elzbieta Dubinska,Zoltán Pécskay
Polar Research , 2011, DOI: 10.3402/polar.v30i0.7306
Abstract: The dolerites of Svalbard are mineralogically and geochemically homogeneous with geochemical features typical of continental within-plate tholeiites. Their geochemistry is similar to tholeiites belonging to a bimodal suite defined as the High-Arctic Large Igneous Province (HALIP). K–Ar dating of numerous dolerites sampled from many locations across Svalbard define a narrow time span of this magmatism from 125.5±3.6 to 78.3±2.6 Mya. Discrete peaks of intensive activity occurred at 115.3, 100.8, 91.3 and 78.5 Mya corresponding to (1) breakup of the continental crust and formation of an initial rift as a result of mantle plume activity, located in the southern part of the Alpha Ridge; (2) magmatic activity related to spreading along the Alpha Ridge that led to the development of the initial oceanic crust and (3) continuation of spreading along the Alpha Ridge and termination of magmatic activity related to HALIP (last two peaks at 91.3 and 78.5 Mya).
Radiometric dating of the tertiary volcanics in Lower Silesia, Poland. V. K-Ar and palaeomagnetic data from Late Oligocene to Early Miocene basaltic rocks of the North-Sudetic Depression
Krzysztof BIRKENMAJER,Zoltán PéCSKAY,Jacek GRABOWSKI,Marek W. LORENC
Annales Societatis Geologorum Poloniae , 2007,
Abstract: This is the fifth contribution to geochronological, petrologic-geochemical and palaeomagnetic studies of the Tertiary basaltoids of Lower Silesia, Poland. It covers the area of the North-Sudetic Depression close to its contact with the Fore-Sudetic Block (6 new sites). The oldest K-Ar date was obtained from basanite plug at Sichów (BP-34: 27.80 1.27 Ma) located exactly on the Sudetic Marginal Fault. It determines the age of the fault as Late Oligocene. Five other sites (BP-35-39) yielded radiometric ages between 20.07 0.90 Ma and 18.72 0.81 Ma (Early Miocene). The volcanics investigated are typical within-plate basaltoids represented by ankaratrite and basanite. The Late Oligocene Sichów intrusion (BP-34) is normally magnetized, the Early Miocene basaltic rocks (ankaratrite BP-39 and basanites: BP-35-38) reveal reversed magnetization.
On the age of the Dej Tuff, Transylvanian Basin (Romania)
Alexandru Szakács, , Zoltán Pécskay, Lóránd Silye, Kadosa Balogh, Daniela Vlad, Alexandrina Fül p
Geologica Carpathica , 2012, DOI: 10.2478/v10096-012-0011-9
Abstract: The Dej Tuff is an important stratigraphic marker in the Transylvanian Basin. However, its Early Badenian age is known only on biostratigraphical grounds so far. A number of radiometric dating techniques including K-Ar, Ar-Ar and fission-track have been used in order to constrain more precisely its age, allowing the calibration of the Transylvanian Basin's evolutionary models. Although individual dating methods could not provide a unique, reliable and accurate radiometric age, comparison and evaluation of multiple methods gives 14.8-15.1 Ma as the most likely formation age of the Dej Tuff.
Geología y estratigrafía de la hoja 3246-ii Miramar, Costa Rica
?á?ek,Vladimír; Vorel,Tomá?; Kycl,Petr; Huapaya,Sofia; Mixa,Petr; Grygar,Radek; Havlí?ek,Pavel; ?ech,Stanislav; Hrazdíra,Petr; Metelka,Václav; ?ev?ík,Josef; Pécskay,Zoltán;
Revista Geológica de América Central , 2012,
Abstract: the oldest rocks of the miramar sheet are represented by sediments of the punta carballo formation (miocene), which are exposed at the sw corner. however, volcanic rocks of the older aguacate group (miocene-pliocene) and overlying monteverde formation (lower pleistocene) dominate the area. the pliocene to pleistocene silicic ignimbrites and quaternary sediments are subordinate. new k-ar ages yielded 4,41±0,15 to 4,99±0,36 ma for the aguacate group and 1,71±0,22 to 1,77±0,11 ma for the monteverde formation. gabrodioritic stock was newly mapped in the aguacate group accompanying numerous other intrusive bodies of variable composition. new k-ar ages were obtained for the rhyodacitic domes: 1,71±0,14 ma for the cerro la cruz dome and 1,59±0,12 ma for the cerro san miguel dome. definition of volcanic units is based on detailed petrography, xrd, microprobe and 33 new bulk-rock chemical analyses.
Fluorescently Labeled Methyl-Beta-Cyclodextrin Enters Intestinal Epithelial Caco-2 Cells by Fluid-Phase Endocytosis
Ferenc Fenyvesi, Katalin Réti-Nagy, Zsolt Bacsó, Zsuzsanna Gutay-Tóth, Milo Malanga, éva Fenyvesi, Lajos Szente, Judit Váradi, Zoltán Ujhelyi, Pálma Fehér, Gábor Szabó, Miklós Vecsernyés, Ildikó Bácskay
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0084856
Abstract: Cyclodextrins are widely used excipients for increasing the bioavailability of poorly water-soluble drugs. Their effect on drug absorption in the gastrointestinal tract is explained by their solubility- and permeability-enhancement. The aims of this study were to investigate penetration properties of fluorescently labeled randomly methylated-beta-cyclodextrin (FITC-RAMEB) on Caco-2 cell layer and examine the cellular entry of cyclodextrins on intestinal cells. The permeability of FITC-RAMEB through Caco-2 monolayers was very limited. Using this compound in 0.05 mM concentration the permeability coefficient was 3.35±1.29×10?8 cm/s and its permeability did not change in the presence of 5 mM randomly methylated-beta-cyclodextrin. Despite of the low permeability, cellular accumulation of FITC-RAMEB in cytoplasmic vesicles was significant and showed strong time and concentration dependence, similar to the characteristics of the macropinocytosis marker Lucifer Yellow. The internalization process was fully inhibited at 0°C and it was drastically reduced at 37°C applying rottlerin, an inhibitor of macropinocytosis. Notably, FITC-RAMEB colocalized with the early endosome organizer Rab5a. These results have revealed that FITC-RAMEB is able to enter intestinal epithelial cells by fluid-phase endocytosis from the apical side. This mechanism can be an additional process which helps to overcome the intestinal barrier and contributes to the bioavailability enhancement of cyclodextrins.
Preliminary K/Ar geochronology of the Crater Basalt volcanic field (CBVF), northern Patagonia
Z. Pécskay,M.J. Haller,K. Németh
Revista de la Asociación Geológica Argentina , 2007,
Abstract: The Crater Basalt volcanic field is one of the Quaternary intraplate basaltic fields in northern Patagonia. A systematic geological, volcanological and geochronological study of CBVF indicates a multistage history of eruptions of basaltic volcanoes. K/Ar dating, using whole rock samples shows that the measured analytical ages are fully consistent with the available stratigraphic control. The radiometric ages fall into three distinct, internally consistent age groups, which give evidence that there were at least three major episodes of volcanic activity, at about 1.0 Ma, 0.6 Ma and 0.3 Ma ago. The age differences appear to be just significant, even although less than 10 % radiogenic argon was found in the isotope analysis of whole rock samples. El campo volcánico del Basalto Cráter (CVBC) constituye uno de los campos basálticos cuaternarios de intraplaca de la Patagonia septentrional. El estudio sistemático de la geología, volcanología y geocronología del CVBC muestra una historia eruptiva multiepisódica de volcanes basálticos. Las dataciones K-Ar realizadas sobre roca total son coherentes con el control estratigráfico. Las edades obtenidas para el Basalto Cráter permiten distinguir tres episodios diferentes, pero individualmente coherentes, de actividad volcánica, ocurridos hace ~1,0 Ma; 0,6 Ma y 0,3 Ma. Las diferencias de edad parecen ser significativas, aún cuando el contenido de argón radiogénico determinado en los análisis de roca total resultó menor al 10 %.
Muscular and stato-kinetic functions rehabilitation by means of subaquatic stretching (hydrostretching)
Zoltàn Pàsztay
Timisoara Physical Education and Rehabilitation Journal , 2008,
Abstract: Stretching is a physical therapeutical way for maintaining the standard parameters of the body functions from a tender to anadvanced age. The most important parameter that is influenced by the different techniques of stretching, especially byhydrostretching, is flexibility. This article presents the technique and the effects of hydrostretching on human body (onmuscular balance, strength, muscular metabolism and circulation).
Variations in Quality Parameters of Forage and Medium Quality Winter Wheat Varieties in Storage
Zoltán Mezei,Péter Sipos,Zoltán Gy?ri
Agriculturae Conspectus Scientificus (ACS) , 2007,
Abstract: Our investigation aimed to find out the type and volume of certain qualitative and microbiological changes in various fodder winter wheat varieties and also their similarity to the changes of quality parameters in the storage of improving winter wheat varieties.Laboratory experiments on wheat samples included moisture and protein content, Hagberg’s falling number, wet gluten content, alveographic values, and microbiological tests. Th e examined winter wheat varieties (‘Magor’, ‘Hunor’, ‘Róna’ and ‘Kondor’) retained their moisture, protein content, and their Hagberg’s falling number aft er storage. A slight increase was observed in wet gluten content for all four winter wheat varieties aft er 129 days of storage. This result proved the theory of after-ripening, as gluten percentage improved both qualitatively and quantitatively. An approximate 10% increase in quantitative growth was observed for all four winter wheat varieties. We placed a special emphasis on measuring the alveographic W (10-4 J) values during storage. All four winter wheat varieties showed decreasing values of about 20-40%. Microbiological examinations on the four winter wheat varieties showed that mould, mould flora and total germ count remained balanced, with some slight variations, and that they did not change in terms of time under optimal storage conditions. The changes in the tendency, type, and volume of the five qualitative parameters in the studied four forage wheat varieties and poor baking quality winter wheat varieties during storage showed similarities as compared to that of earlier described and studied improving winter wheat varieties.
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