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Wyświetlanie 1-10 z 32
Tytuł:
Perminvar Effect in Amorphous Hitperm Alloy
Autorzy:
Varga, M.
Varga, R.
Vojtanik, P.
Komova, E.
Powiązania:
https://bibliotekanauki.pl/articles/1813579.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Lr
Opis:
Influence of the directional ordering on magnetization processes in the amorphous $Fe_{44.5}Co_{44.5}Zr_7B_4$ alloy was investigated in the temperature region of 27 to 300°C for stabilization times of up to 1000 min by means of the Perminvar effect. The time-temperature dependent Perminvar effect was found to be very sensitive on the stage of the domain structure stabilization. The Perminvar critical fields $H_{CR}$ were shifted to higher values with increasing stabilization temperatures and times. At lower temperatures, the susceptibility increases over wide range of the measuring fields. Stabilization at higher temperatures causes that the susceptibility abruptly increases in the narrow field range. The record critical field $H_{CR} =246 Am^{-1}$ was obtained.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 119-122
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polylactide nanofibers in skin tissue engineering
Autorzy:
Bacakova, M.
Varga, M.
Riedel, T.
Stranska, D.
Bacakova, L.
Powiązania:
https://bibliotekanauki.pl/articles/283841.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanofibers
tissue engineering
biomaterials
Opis:
Various artificial or natural biomaterials can be used for constructing a scaffold suitable for treating skin injuries. Artificial skin replacements are made from polyhema, polybutylene terephthalate, nylon, polylactic acid and polyglycolic acid or their copolymers. The most widely applied natural biomaterials are collagen, chitin, hyaluronic acid and chondroitin sulfate [1]. In recent tissue engineering, nanofibrous scaffolds have been very attractive because they better simulate the architecture of natural extracellular matrix. In skin tissue engineering, nanofibrous membranes can be used for constructing a bilayer of fibroblasts and keratinocytes [2]. These membranes will separate the two cell types, ensuring their physical and humoral communication; thus the layer of fibroblasts will serve as a feeder for keratinocytes. For our study, we chose nanofibers made of polylactide (PLA), prepared in external collaboration with Elmarco Ltd. (Liberec, Czech Republic). The main advantage of PLA is its biodegradability; it is slowly resorbed in the organism, and is finally replaced by regenerate tissue. The adhesion and growth of cells on the scaffolds can be improved by further modifications, e.g. plasma treatment or coating the scaffold fibers with biomolecules that are normally present in the natural skin (collagen, hyaluronic acid), or that occur during wound healing (fibrin). Modification by plasma leads to changes in the physical and chemical properties of the material surface (i.e., surface wettability, morphology, electric conductivity, roughness, morphology, mechanical properties) [3]. In our experiment we evaluated the interaction of human HaCaT keratinocytes with PLA nanofibrous meshes that were modified by plasma irradiation or by coating with collagen, fibrin and hyaluronan of low (70-120 KDa) or high (1000-1250 KDa) molecular weight. For plasma irradiation, PLA nanofibers were exposed to O2, CH4 or Ar plasma for different times, with various ranges of power. For more detailed studies, O2 plasma was chosen, because this type of plasma best supported the adhesion and growth of cells. PLA nanofibrous meshes were prepared with different densities of the fibres (5 g/m2, 9 g/m2, 16 g/m2, 30 g/m2). The potential damage to the fibres after plasma modification was observed using scanning electron microscopy (SEM). The cell adhesion, growth and metabolic activity were evaluated by the number of cells, their morphology, the amount of cellular DNA (PicoGreen ds DNA assay kit, Invitrogen®) and the XTT test (Roche) on days 1, 3 and 7 after seeding. The results indicated that polylactide nanofibrous scaffolds promote adhesion and growth of HaCaT keratinocytes. Modification in plasma further improved the proliferation of cells on PLA nanofibers. The cells proliferated better on PLA meshes with lower densities of the fibers (5 g/m2, 9g/m2). SEM showed that damage to the fibers increased with the length of the period of plasma treatment. The collagen deposited on the fibers changed the morphology of the cells. The cells on the control unmodified fibers adhered in clusters, but on the collagen-coated fibers they were spread homogeneously. We can conclude that polylactide nanofibrous membranes are a promising material for the construction of temporary carriers for skin cells, particularly after they have been physically or biologically modified.
Źródło:
Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 127-128
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Properties of Conducting Polypyrrole Nanotubes
Autorzy:
Rudajevová, A.
Varga, M.
Prokeš, J.
Kopecká, J.
Stejskal, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402141.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Le
66.70.Hk
65.40.De
66.30.Xj
Opis:
Thermal properties of polypyrrole nanotubes synthesized by the chemical oxidation of pyrrole with iron(III) chloride in the presence of methyl orange as structure-guiding template, have been investigated. As-prepared polypyrrole salt and corresponding base were compressed into pellets. Thermogravimetric analysis has shown that the heating/cooling of both polymers is connected with water desorption/re-absorption. This process influences all temperature dependences of the thermophysical properties. The specific heat of both polypyrrole forms was the same at 35°C. The thermal diffusivity of polypyrrole base was lower than that of the salt. The dilatational characteristics are strongly influenced by water desorption/re-absorption. Water desorption is connected with the contraction of polypyrrole and its re-absorption with the expansion of polypyrrole. The electrical resistivity was measured, in analogy to thermal experiments, by a four-point van der Pauw method. The electrical resistivity was 0.016 and 10.2 Ωcm at room temperature, for both materials. The electrical resistivity was also influenced by water desorption/re-absorption as well as other thermophysical properties.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 730-736
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoimpedance Effect in Field Annealed $(FeNi)_{78}Nb_{7}B_{15}$ Amorphous and Nanocrystalline Bilayer Ribbons
Autorzy:
Varga, M.
Marcin, J.
Capik, M.
Janičkovič, D.
Švec, P.
Škorvánek, I.
Powiązania:
https://bibliotekanauki.pl/articles/1367440.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.50.Tt
75.60.Nt
43.58.Bh
Opis:
The influence of the magnetic field annealing on the magnetoimpedance effect has been investigated in rapidly quenched $(Fe_{0.5}Ni_{0.5})_{78}Nb_{7}B_{15}$ monolayer and bilayer thin ribbons. The highest impedance ratio value $(ΔZ//Z)_{max}$=72% and the maximum field sensitivity $η_{max}$=12 %/Oe was obtained in the bilayer ribbon, annealed under longitudinal magnetic field at 773 K that exhibited nanocrystalline structure. The higher values of $(ΔZ//Z)_{max}$ in bilayer ribbons, as compared to their monolayer counterparts, are attributed to the increased ratio of their thickness to the penetration depth.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 122-123
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress Dependence of the Switching Field in Glass Coated Microwires
Autorzy:
Komová, E.
Varga, M.
Varga, R.
Vojtaník, P.
Torrejon, J.
Provencio, M.
Vázquez, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813586.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
Opis:
Here we present the study of the stress dependence of the switching field in amorphous glass-coated magnetic microwire of composition FeNiMoB. Samples were heat treated in the temperature range from 250°C up to 500°C in order to obtain relaxed and nanocrystalline state. As-cast microwire shows strong stress dependence of the switching field, which decreases with the temperature of annealing. The sample is almost not stress dependent after heat treatment at 425°C, because the magnetostriction vanishes. However, the strongest stress dependence was found for the microwire annealed at 400°C, just below the optimal annealing temperature to obtain the nanocrystalline state.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 135-138
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Directional Ordering in Amorphous $Fe_{43}Ni_{43}Zr_7Cu_1B_6$ Ferromagnetic Alloys
Autorzy:
Varga, M.
Varga, R.
Vojtaník, P.
Hernando, B.
Prida, V.
Santos, J.
Pérez, M.
Powiązania:
https://bibliotekanauki.pl/articles/1533987.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Nt
Opis:
Development of the atomic directional ordering in the $Fe_{43}Ni_{43}Zr_7Cu_1B_6$ alloy, during its conventional the same as after transverse magnetic field annealing, was experimentally studied by the amplitude dependence of susceptibility and hysteresis loops measurements, respectively. Diffusion processes of the mobile atoms caused perminvar effect, decrease of the initial susceptibility, increase of the critical field, and linear shape of the hysteresis loop. Uniaxial magnetic anisotropy, created during magnetic field annealing of the FeNiZrCuB alloy, was confirmed also by observation of the surface domain structure.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 804-806
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization and design of four gripper pneumatical Rubik’s Cube solver
Autorzy:
Hajduk, M.
Varga, J.
Durovsky, F
Powiązania:
https://bibliotekanauki.pl/articles/117884.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
Rubik's cube
Pneumatical manipulator
Service robotics
Thistletwaite45
Opis:
Robotic Rubik’s solver is an excellent example of science popularizing mechatronic device, since it combines knowledge of several technological fields including computer vision techniques, advanced numerical algorithms and control of industrial pneumatic components with popula-rity of Rubik’s cube in one resulting device. First version of solver con-structed by our department was equipped only by 2 lower grippers, resul-ting in approximately four minutes for single cube solution. Proposed paper describes not only experience gained by development of upgraded 4 gripper version but includes statistical analysis of Thistlethwait’s 45 algorithm required for solving process optimization. Mechanical design, electronics, system overview, performance and limitations of upgraded 4 gripper version are explained in detail as well.
Źródło:
Applied Computer Science; 2014, 10, 3; 57-67
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single Domain Wall Propagation at Low Fields
Autorzy:
Kostyk, J.
Varga, R.
Vazquez, M.
Powiązania:
https://bibliotekanauki.pl/articles/1366478.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.60.Ej
75.78.Fg
Opis:
We have studied the domain wall propagation at low fields regime in thin glass-coated microwire of composition $Fe_{77.5}Si_{7.5}B_{15}$. It is shown, that power law describes domain wall dynamics at low fields. Such behaviour results from the interaction of the propagating domain wall with the defects present in the material. At high fields, the domain wall mobility becomes negative. This can be explained as a result of domain structure relaxation. The exponent q from power law, which determines the domain wall shape, has a value of 0.19 for both cases, without applied stress and with applied stress of 20 MPa. This means, that domain wall shape is flexible in both measurements.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 30-31
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxychilus (Mediterranea) hydatinus (Gastropoda: zonitidae) new for Slovakia, with notes on its distribution in Hungary
Autorzy:
Dvorak, L.
Horsak, M.
Varga, A.
Powiązania:
https://bibliotekanauki.pl/articles/84090.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
The first records of Oxychilus hydatinus (Rossmässler, 1838) from Slovakia are reported. The material was identified based on a detailed comparative study of shell morphology and internal structure of penis. The Slovak sites represent the northernmost occurrence of this species.
Źródło:
Folia Malacologica; 2004, 12, 3
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Thermal Treatment on Frequency Dependence of the Switching Field in Amorphous and Nanocrystalline FeNiMoB Microwires
Autorzy:
Komova, E.
Varga, R.
Vazquez, M.
Powiązania:
https://bibliotekanauki.pl/articles/1507122.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
75.50.Tt
Opis:
Amorphous and nanocrystalline ferromagnetic glass-coated microwires show excellent magnetic properties that make them very suitable to be employed as sensing elements in devices for technical applications. New $Fe_{40}Ni_{38}Mo_4B_{18}$ alloy composition can be appropriate to prepare soft magnetic nanocrystalline microwires which exhibit magnetic bistability even in the nanocrystalline state. Stability of magnetic properties after different thermal treatments ($T_{a}$ = 250-425°C) and after nanocrystallization was confirmed by the switching field $H_{sw}$ measurements. The frequency dependence of the switching field was investigated. Two contributions to the domain wall switching mechanism were recognized: magnetoelastic one coming from the magnetoelastic interaction of the magnetic moments with the stresses and relaxation one coming from the structural relaxation of local defects at atomic scale. But, the relative role of both contributions has been shown to vary strongly in different stage of devitrification.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 768-769
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 32

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