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    Wyświetlanie 1-13 z 13
    Tytuł:
    Nanopores in Silica Aerogels
    Autorzy:
    Šauša, O.
    Iskrová, M.
    Majerník, V.
    Krištiak, J.
    Jesenák, K.
    Vargová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812550.pdf
    Data publikacji:
    2008-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    Opis:
    The size of nanopores in thermally treated samples of silica aerogels was determined by ortho-positronium lifetime measurements at room temperature. The annealing of samples in the temperature region of 300-800°C does not make substantial changes in pore size felt by positronium. The annealing at higher temperatures from an interval of 800-1050°C causes shrinkage of the samples reducing the pore size to 1-15 nm. The macropores vanish at temperature treatment at 1000°C and the positron annihilation is not affected by oxygen from air.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 5; 1517-1522
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of cattle and sheep grazing on grassland in Velká Fatra National Park
    Wpływ wypasu bydła i owiec na ekosystemy trawiaste Parku Narodowego Velká Fatra
    Autorzy:
    Jendrisakova, S.
    Kovacikova, Z.
    Vargova, V.
    Michalec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/293177.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    bydło
    łąki alpejskie
    owce
    skład botaniczny
    wypas
    grazing
    alpine grassland
    cattle
    sheep
    botanical composition
    Opis:
    The Vel'ká Fatra National Park (declared on 1 April 2002) is extending on an area of 40,371 ha and was established to protect well-preserved ecosystems. The Vel'ká Fatra (Greater Fatra) with the highest peak Ostredok (1592 m altitude) is a typical mountain territory and ranks among the highest mountain ranges in Slovakia. Grassland areas above the forest line ("hole" in Slovak) and highland relief are typical for Vel'ká Fatra where forests cover is 85% of the area. Large areas of grassland located on gently modelled ridges resulted from deforestation many centuries ago. The alpine meadows which are rich in rare plant communities cover the area of 2000 ha. In the past, these grasslands were used by cutting and grazing. Nowadays, the meadows are not mowed at all. The reasons are low numbers of ruminants in nearby farms, high cost and poor access roads that are eroded very much. Grazing with young cattle has been banned and consequently tall grasses expanded, swards thinned as well as avalanche risk increased. Currently, it is allowed to graze young cattle again, but farmers do not exploit this option very much. About 200 heifers and 2,500 sheep graze there, but only at the lowest areas of the mountains and for short periods of time. The grassland is dominated by Deschampsia caespitosa (L.) P. Beauv. and also by very rapidly expanding Calamagrostis epigejos (L.) Roth, Brachypodium pinnatum (L.) P. Beauv. and Cirsium arvense (L.) Scop. indicating a prolonged period of abandonment.
    Park Narodowy Vel'ká Fatra ustanowiony 1 kwietnia 2002 r. dla ochrony dobrze zachowanych ekosystemów zajmuje powierzchnię 40 371 ha. Vel'ká Fatra (Większa Fatra) z najwyższym szczytem Ostredok (1592 m n.p.m.) jest typowym obszarem górskim i zalicza się do najwyższych grzbietów górskich Słowacji. Charakterystyczne dla parku są ekosystemy trawiaste położone powyżej linii lasów ("hole" w języku słowackim), porastających 85% obszaru i wysokogórskie ukształtowanie terenu. Rozległe obszary trawiaste, usytuowane na łagodnie uformowanych grzbietach, są wynikiem wylesiania, które miało miejsce wiele wieków temu. Alpejskie łąki, bogate w zespoły rzadkich roślin, pokrywają powierzchnię 2000 ha. W przeszłości były wykorzystywane jako użytki zielone. Obecnie łąki nie są koszone. Powodem jest niewielka liczba przeżuwaczy w okolicznych gospodarstwach, wysoki koszt i uciążliwy transport na silnie zerodowanych drogach. Zakazano wypasu młodego bydła. W konsekwencji rozwinęły się zespoły wysokich traw, ruń została przerzedzona i zwiększyło się ryzyko lawinowe. Obecnie zezwala się ponownie na wypas młodego bydła, ale rolnicy nie korzystają powszechnie z tej możliwości. Wypasa się tam jedynie 200 jałówek i 2500 owiec jedynie w najniżej położonych terenach górskich przez krótki okres. Zespoły trawiaste są zdominowane przez Deschampsia caespitosa (L.) P. Beauv. i przez bardzo ekspansywne Calamagrostis epigejos (L.) Roth, Brachypodium pinnatum (L.) P. Beauv. and Cirsium arvense (L.) Scop., co wskazuje na wydłużony okres zaniechania użytkowania.
    Źródło:
    Journal of Water and Land Development; 2011, 15; 83-90
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Characterization of $Co_2MnSi$ Heusler Microwires
    Autorzy:
    Ryba, T.
    Vargova, Z.
    Varga, R.
    Kováč, J.
    Zhukova, V.
    Zhukov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368011.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Cc
    75.30.Gw
    Opis:
    We report on the basic magnetic properties of glass-coated $Co_2MnSi$ Heusler microwires. Measurements of hysteresis loops in different directions show that easy magnetization axis coincides with the wire's axis. The frequency dependence of the coercive field has been measured at room temperature in the frequency range from 10 Hz to 10 kHz. The coercivity decreases with the frequency up to 100 Hz and then increases linearly up to 1 kHz.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 196-197
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Magnetic Characterization of NiMnSb Half-Heusler Alloy Prepared by Rapid Quenching
    Autorzy:
    Ryba, T.
    Vargova, Z.
    Varga, R.
    Ilkovic, S.
    Reiffers, M.
    Haskova, V.
    Szabo, P.
    Kravcak, J.
    Gyepes, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368037.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.50.Cc
    Opis:
    NiMnSb half-Heusler alloy in the form of a rod has been prepared by rapid quenching (suction-casting) method. The rod is characterized by single phase $C1_b$ crystalline structure with lattice parameter a=5.982 Å. Magnetic measurements reveal an isotropic character of bulk NiMnSb alloy. Our study shows relatively high spin polarization of bulk NiMnSb in the range 35-50%.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 206-207
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Andreev Reflection Spectroscopy Study of Spin Polarization in Co₂Cr(Fe)Al Heusler Alloys
    Autorzy:
    Hašková, V.
    Szabó, P.
    Kováč, J.
    Ryba, T.
    Vargová, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385695.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.25.Ba
    74.45.+c
    77.80.bg
    Opis:
    The present paper is dealing with the experimental study of the influence of Fe substitution on the Curie temperature and spin polarization in Co₂CrAl Heusler alloys. A recently successfully introduced new rapid quenching method has been used for the preparation of Co₂CrAl and $Co₂Cr_{0.6}Fe_{0.4}Al$ ribbon samples. The Curie temperatures have been determined from magnetization measurements being 378 K for Co₂CrAl and much above 400 K for $Co₂Cr_{0.6}Fe_{0.4}Al$. The spin polarization parameter P₀ of the studied samples has been estimated from point-contact Andreev reflexion spectroscopy measurements. In pure Co₂CrAlP₀ = 0.5 - 0.9, and in the case of $Co₂Cr_{0.6}Fe_{0.4}AlP₀$ = 0.4 - 0.9. Hence, it is shown that Fe substitution of Cr in $Co₂Cr_{1-x}FeₓAl$ Heusler alloys at a concentration of x=0.4 significantly increase the Curie temperature without marked influence on the spin polarization.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 377-378
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Mn doping on magnetic and structural properties of Co₂FeSi Heusler alloy
    Autorzy:
    Galdun, L.
    Ryba, T.
    Kováč, J.
    Prida, V.
    Hernando, B.
    Vargová, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054765.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    72.20.Lp
    Opis:
    We have studied the effect of Mn doping on structural and magnetic properties of Co₂FeSi Heusler alloy. Co₂FeSi, Co₂Mn_{0.25}Fe_{0.75}Si and Co₂Mn_{0.5}Fe_{0.5}Si alloys were prepared by melt spinning technique which offers fast and simple production of large amount of materials in a single production step. The rapid quenching method provides an opportunity to prepare Heusler alloys with highly ordered L2₁ structure confirmed by X-ray analysis in all the samples. Magnetic measurements revealed high Curie temperatures (>1000 K) and well defined easy magnetization plane parallel with the ribbon plane. Those attributes predispose given samples for applications in spintronics.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 866-868
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Structural Characterization of Nickel and Iron Based Heusler Ribbons Ni₂FeZ (Z = In, Sn, Sb)
    Autorzy:
    Frol'ová, L.
    Ryba, T.
    Vargová, Z.
    Komanický, V.
    Kováč, J.
    Gyepes, R.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032228.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.En
    75.30.Gw
    Opis:
    Comparison of structural, chemical, and magnetic properties of Ni₂FeZ (Z = In, Sn, Sb) Heusler ribbons produced by melt-spinning method is presented. The aim of work was to prepare the Heusler alloys with the appropriate chemical composition in a single step without additional thermal treatment. Scanning electron microscopy analysis revealed polycrystalline structure of all samples. It is shown that correct L2₁ structure of Ni₂FeSb can be obtained in a single production step. On the other hand, no Heusler L2₁ phase (nor its variants) occur in Ni₂FeSn alloy. Additionally, magnetic characterization revealed high Curie temperatures of the Heusler phases (above 600 K for Ni₂FeSb and 800 K for Ni₂FeIn).
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 735-737
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Characterization of Melt-Spun Co-Ni-Ga Ferromagnetic Superelastic Alloy
    Autorzy:
    Mino, J.
    Ipatov, M.
    Gamcova, J.
    Saksl, K.
    Durisin, M.
    Zhukova, V.
    Vargova, Z.
    Zhukov, A.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030261.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.fg
    Opis:
    Ribbons of composition Co₄₉Ni₂Ga₃₀ have been prepared by melt-spinning method. X-ray diffraction investigation revealed single phase with B2 structure at room temperature. However, analysis of magnetization dependence of temperature suggests phase transition in the range 150-250 K. Resistivity measurements revealed similar transition with shift to higher temperatures in the presence of magnetic field.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1075-1077
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ni_2FeSi Heusler Glass Coated Microwires
    Autorzy:
    Galdun, L.
    Ryba, T.
    Prida, V.
    Hernando, B.
    Zhukova, V.
    Zhukov, A.
    Vargová, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032750.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    72.20.Lp
    Opis:
    We report on fabrication, structural and magnetic properties of novel Heusler-type glass coated Ni₂FeSi microwires that were prepared by the Taylor-Ulitovsky method, having a metallic nucleus diameter about 3.9 μm and total sample diameter of 39 μm. This single step and low cost fabrication technique offers to prepare up to km of glass-coated microwires starting from few g of cheap elements for diverse applications. The X-ray diffraction data from the metallic nucleus indicates L2₁ crystalline structure (a=5.563 Å), with a possible DO3 disorder. Magnetic measurements determined the Curie temperature well above the room temperature (770 K) together with uniform easy magnetization axis of the metallic core, which predisposes this material to a suitable candidate for spintronic applications.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 851-853
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of Melt-Spun Co₂MnAl Heusler Alloy
    Autorzy:
    Piovarči, S.
    Diko, P.
    Kavečanský, V.
    Ryba, T.
    Vargová, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032646.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    75.50.Cc
    61.05.cp
    Opis:
    The growth-related microstructure and texture of the Co₂MnAl-type Heusler alloy in the form of a melt-spun ribbon was studied by electron microscopy, electron backscattered diffraction and X-ray diffraction. It is shown that melt spinning produces a single-phase disordered Heusler alloy. The fine grain structure at the wheel side of the ribbon exhibits no texture, while dominant columnar grain structure formed on the free surface side exhibits the ⟨111⟩ fibre texture with a declination by about 10 degrees in the spinning direction. The dendritic growth of columnar crystals causes inhomogeneity of the chemical composition on a micrometre scale with a higher Co and Al concentration in the centre of dendritic arms and a higher concentration of Mn at the dendrite arm boundaries.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 881-883
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tick distribution along animal tracks: implication for preventative medicine
    Autorzy:
    Rasi, T.
    Majlath, I.
    Bogdziewicz, M.
    Dudek, K.
    Majlathova, V.
    Wlodarek, J.
    Aimasi, M.
    Vargova, B.
    Tryjanowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081665.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    One Health
    tick-borne diseases
    spatial distribution
    preventive medicine
    Ixodes
    human behaviour
    Opis:
    Introduction. Tick abundance and the prevalence of the pathogens they carry have been increasing worldwide in the last decades, and is projected to increase even further. Despite the fact that problem is global, there still remain many gaps in the diagnosis and treatment of tick-borne diseases. The best protection from tick-borne pathogens, therefore, is prevention and avoidance of bites. Ticks mobility is limited so that their spatial distribution is strongly correlated with the presence of, especially with large mammals. In this study, the hypothesis was tested that tick abundance is higher on animal tracks in the forests than in adjacent habitats. This is an important issue because there are still several human habits and practices that can decrease the zoonoses risk. For example, during recreation in forest, people should always walk on the paths (including narrow animal’s tracks) instead of wading through bushes. Materials and method. Flagging of animal trails and near control transects were performed simultaneously. Next, collected ticks were counted, sexed and aged. Results. The abundance of ticks was almost 5-fold (Ixodes ricinus) and 3-fold (Dermacentor spp.) higher on animal trails than on adjacent control transects. Conclusions. The results obtained support the hypothesis that ticks are more abundant on pathways than in adjacent habitats. Most likely, the pattern emerges because large mammals, like deer, which are the most important ticks hosts, use forest paths to move across the landscape and frequently move along the same routes. This research sends an important public message that these forest trails are hotspots of disease risk and should be avoided.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 360-363
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mercury accumulation in plants from contaminated arable lands in Eastern Slovakia
    Autorzy:
    Kimakova, T.
    Vargova, V.
    Onacillova, E.
    Cimbalakova, I.
    Uher, I.
    Harich, P.
    Schuster, J.
    Poracova, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2085417.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    mercury
    soils
    plants
    environment
    atomic absorption spectrometry
    Opis:
    Introduction and Objective. Contamination of soil by mercury poses several risks to human health through consumption of fruits and vegetables. In Slovakia, a high concentration of mercury is found in the soil of the Central Spiš region. The objective of the study is to measure the mercury concentrations in the parts of selected plant species and trees growing within 100 meters of a former ore processing facility. Materials and Method. A total of 24 samples of plants, 20 samples of parts of needle-leaved trees and 9 samples of parts of broad-leaved trees were collected from soils with a high concentration of mercury. The concentration was measured by atomic absorption spectrometry in different parts of the plants: leaves – 18 species, roots – 15 species, stems – 11 species, flowers – 7 species), and different parts of trees (crust – 8 species, branches – 8 species, needles – 5 species, cones – 5 species, leaves – 3 species). Results. The concentrations of mercury in the soils taken at a depth of 0.25 m exceeded the maximum allowed levels more than 50-times. Potatoes, parsley and carrots from these soils exceeded the maximum allowed mercury levels 6-times, 5-times and twice, respectively. The average concentrations of mercury in the roots of 2-year onions exceeded the limit more than 50-times. The flowers of cornflower contain 18.20 mg. kg-1, leaves of dandelion 10.61 mg. kg-1 and roots of plantain 6.80 mg. kg-1 of mercury. Regarding trees, the highest concentrations were found in the branches of juniper and leaves of aspen – more than 1 mg. kg-1. Conclusions. The systematic monitoring of mercury is still very important, since it was found that the end of ore processing does not solve the issue of contamination in the Central Spiš region. Therefore, the consumption of fruits and vegetables from the areas of former ore processing facilities is not recommended.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2020, 27, 1; 29-35
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphometric analysis – effect of the radiofrequency interface of electromagnetic field on the size of hatched Dermacentor reticulatus larvae
    Autorzy:
    Vargová, B.
    Majláth, I.
    Kurimský, J.
    Cimbala, R.
    Pipová, N.
    Živčák, J.
    Tryjanowski, P.
    Peťko, B.
    Džmura, J.
    Ižariková, G.
    Majláthová, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/28762746.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2021, 28, 3; 419-425
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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