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Wyszukujesz frazę "Fornal, P." wg kryterium: Autor

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    Wyświetlanie 1-13 z 13
    Tytuł:
    Local electronic and charge state of iron in FeTe2
    Autorzy:
    Stanek, J.
    Fornal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147241.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer
    chemical bonding
    charge state
    tellurides
    Opis:
    From 57Fe Mössbauer spectrum of FeTe2 taken in high external magnetic field (B = 4.6 T), the sign of electric field gradient was determined as negative, with an asymmetry parameter of 0.2. A comparison of these data with results of calculation of the electric field gradient within point charge model suggests the lattice character of electric field gradient with some contribution from covalency effects. The effective magnetic field acting on 57Fe is less than the applied, which points out the diamagnetic Fe+2 state of iron. This "electronic state" is in a contradiction to Fe+3 "charge state" concluded from 125Te experiments on 3d transition metal ditellurides as well as from 57Fe quadrupole splitting and isomer shift.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 63-65
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mobility of Hematite Submicron Particles in Water Solutions of Sugar
    Autorzy:
    Fornal, P.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811893.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.40.Jc
    47.57.ef
    47.57.J-
    47.61.Cb
    Opis:
    The mobility of the 100 nm $Fe_2O_3$ particles in dense water solutions of sugar (sucrose) was determined from the analysis of the resonance absorption line shape of the Mössbauer spectra recorded in the -5°C to 40°C temperature range for different sugar concentrations. The discrepancy between the experimental data and the prediction of the classical theory of Brownian movement are interpreted in the term of the short observation time and the interaction between the solid particles in fluids, which extends in water up to 300 nm. The sedimentation process in the studied colloids was observed.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1667-1673
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Brownian Movement of Inorganic Nanoparticles in Sediments
    Autorzy:
    Fornal, P.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506300.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.40.Jc
    64.75.Xc
    47.57.ef
    66.30.Pa
    87.64.kx
    Opis:
    The 100 nm particles of $Fe_{2}O_{3}$ and metallic Fe sedimented jointly with $Al_{2}O_{3}$ powder from their suspension in oleic acid exhibit distinguished mobility which depends on the concentration of aluminum oxide. This observation is interpreted as the result of the interparticle Fe-Fe magnetic interactions which lead to the formation of the rigid network of magnetic metallic iron nanoparticles.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 12-14
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous transmission and scattering Mössbauer measurements of powder samples
    Autorzy:
    Fornal, P.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148213.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    methodology of Mössbauer spectroscopy
    CEMS
    micro-powders
    Opis:
    A vertical experimental set-up for simultaneous recording transmission and scattering Mössbauer spectra is described. Application of the apparatus for the study of model powder mixture of two components with different grain sizes shows differences in the relative intensity ratio of these fractions in absorption and conversion electron Mössbauer spectroscopy (CEMS) spectra. This effect, explained as a result of the size selectivity of CEMS technique, is parameterized by the grain radius ratio of components. The possible application for investigation of isolated surface nano- and microobjects is discussed.
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 13-16
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentation of Fe2O3 and metallic iron nanoparticles exhibiting Brownian movement
    Autorzy:
    Fornal, P.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147364.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Brownian movement
    nanoparticles
    sedimentation
    Opis:
    Sedimentation of nanoparticles in water solutions was studied in situ by transmission Mössbauer spectroscopy in horizontal and vertical geometry. The studied specimens were Fe2O3 of a commercial pigment and metallic iron nanoparticles in slurry used in a water purification technology. The sedimentation is selective and leads to the gradual removing of the bigger particles from a solution. The iron nanoparticles in the solution are relatively chemically stable until, due to the drying, the sediment becomes exposed to the air.
    Źródło:
    Nukleonika; 2013, 58, 1; 39-42
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer Spectroscopy in the Studies of Iron Phases From the Slags After Zinc and Lead Production
    Autorzy:
    Jonczy, I.
    Fornal, P.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380117.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mössbauer spectroscopy
    phase composition
    slag after zinc
    lead production
    spektroskopia Mössbauera
    skład fazowy
    produkcja ołowiu
    Opis:
    Upper Silesia District is one of the most polluted areas in the country. Rich deposits of metal ores and hard coal have contributed to the extensive development of metallurgy and mine industry which started as early as in the Middle Ages. The ecological hazard can be illustrated by an over 100-year-old waste dump of Zn-Pb ores in one of the Silesian cities – in Ruda Śląska. Despite the long storage period, the wastes, represented mainly by weathered slags as also vitrified waste material, contain of lot of heavy metals in varied their chemical forms. The following metals have been found in wastes: Cd, Pb, Zn, As, Cu, Ti and other, and also a lot of amounts of iron. In the article the results Mössbauer spectroscopy are presented, as a preliminary stage of mineralogical studies of Zn-Pb wastes. Depending on the type of tested waste material different iron phases have been shown: in the weathered slag four different products of the iron oxidation were detected: divalent Fe(OH)2, mixed valence magnetite, Fe3O4 and three valence Fe(OH)3, α Fe2O3 and γ-Fe2O3 compounds, in the vitrified material metallic forms of iron are dominated.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 21-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mobility of interacting inorganic nanoparticles
    Autorzy:
    Dziedzic-Kocurek, K.
    Fornal, P.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146259.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dynamic light scattering
    hematite nanoparticles
    mobility
    Mössbauer spectroscopy
    viscosity
    Opis:
    The mobility of the 110 nm-Fe2O3 particles in a viscous sucrose solution depends on the concentration of the nanoparticles. When the average particle–particle nearest neighbor distance is less than 250 nm, the particle interaction slows down their mobility. When is more than 170 nm, the small mobility of nanoparticles does not depend on their concentration. The critical distance is approximately equal to 2Rh = 260 nm, where Rh is the hydrodynamic radius, determined by the dynamic light scattering (DLS) method.
    Źródło:
    Nukleonika; 2015, 60, 1; 19-22
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of TiN protective coatings on steel
    Autorzy:
    Fornal, P.
    Stanek, J.
    Jaglarz, J.
    Dąbrowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148888.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Conversion Electron Mössbauer Spectroscopy
    hard coating
    oxidation
    TiN
    Opis:
    The properties of fast cutting steel SW7M, stainless steel 1H18N9T, and tool steel NC11 coated with a TiN protective layer were studied using 57Fe Conversion Electron Mössbauer Spectroscopy. The adhesion of the coatings is determined by the thickness of Fe-N and Fe-Ti interface. The model of the abrasion of the protected tools, based on fast diffusion of Fe ions to the surface though the TiN layer and further oxidation is proposed.
    Źródło:
    Nukleonika; 2003, 48,suppl.1; 21-24
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Dynamics of Magnetic Iron Nanoparticles Aggregates in Protein Gels
    Autorzy:
    Konik, K.
    Fornal, P.
    Okła, D.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490101.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.Jn
    83.60.Np
    61.25.H-
    82.70.Gg
    Opis:
    The 60 nm metallic iron nanoparticles and its aggregates in gelatine gel were studied by means of optical microscopy, X-ray microtomography, atomic force scanning microscopy and the Mössbauer spectroscopy. The isolated nanoparticles in gel exhibit fast bounded diffusion described by Brownian movement. In the external magnetic field these magnetic particles form spectacular linear aggregates whose local dynamical and magnetic properties were determined from the Mössbauer spectra.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 457-463
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local States of Tellurium in Isolated Helical Chains
    Autorzy:
    Stanek, J.
    Fornal, P.
    Hafner, S. S.
    Pfitzner, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028993.pdf
    Data publikacji:
    2001-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    Opis:
    The local electronic state of Te in the helical chains of CuXY$\text{}_{2(1-x)}$Te$\text{}_{2x}$ (X = Cl, Br; Y = Se, S) were studied using the Mössbauer spectroscopy of $\text{}^{125}$Te at 10 K and 70 K. The isolated chains of Te in these compounds are less rigid than those in elemental Te. The determined data of quadrupole splitting Δ and Debye temperature Θ$\text{}_{D}$ are indicative of strong local ordering of Te in one of the two non-equivalent crystallographic positions. It was not possible to resolve crystallographic positions by the Mössbauer spectroscopy.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 5; 807-815
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoelastic Phase Transitions and Critical Behaviour of (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P System
    Autorzy:
    Średniawa, B.
    Duraj, R.
    Pacyna, A.
    Bombik, A.
    Zach, R.
    Bacmann, M.
    Fruchart, D.
    Nizioł, S.
    Fornal, P.
    Stanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013735.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Cc
    71.20.Lp
    Opis:
    This report focuses on magnetoelastic properties and critical behaviour of (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P system. For low Ni content (x=0.01) an isolated critical point was found. Analysis of this critical behaviour in the frame of molecular field approximation was carried out. Moreover, thermal variations of the lattice parameters, as measured by X-ray diffraction techniques, were studied. The (P,T) phase diagrams obtained for several Ni contents show the evidence that the Curie temperature decreases with pressure. The Mössbauer spectra collected for x = 0.025, 0.1, 0.2, 0.25 at different temperatures are also analysed. The existence of two nonequivalent crystallographic sites occupied by iron atoms as well as local magnetic structure is discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 921-925
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pharmacokinetics of propofol in rainbow trout following bath exposure
    Autorzy:
    Gomulka, P.
    Fornal, E.
    Berecka, B.
    Szmagara, A.
    Ziomek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/31775.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Propofol, 2,6-diisopropylphenol, seems to be a good candidate as a fish anaesthetic, however, no study regarding propofol influence on fish has yet been reported. The aim of this study was to examine propofol pharmacokinetics in rainbow trout (Oncorhynchus mykiss) following bath exposure. Fish (n = 100) were exposed to an aqueous propofol bath at 12°C and 17°C; propofol concentration in the bath was 10 mg L(-1). Plasma concentration-time profiles were determined using LC-MS, and pharmacokinetic parameters were calculated. Propofol was absorbed quickly at both temperatures. Its concentration reached 13.8 ± 2.7 μg mL(-1) and 16.1 ± 2.1 μg mL(-1) at 12°C and 17°C, respectively, during the first minute of exposure. Blood plasma propofol decreased rapidly to 6.8 ± 0.7 μg mL(-1) and 6.3 ± 2.2 μg mL(-1) at 12°C and 17°C respectively, during the first 10 minutes of the recovery. The half-life time of propofol was 1.5 h and 1.1 h at 12°C and 17°C, respectively. We found propofol anaesthesia in trout effective and safe. However, it caused a gradual decrease of respiratory rate, and therefore a specific anaesthesia protocol should be developed.
    Źródło:
    Polish Journal of Veterinary Sciences; 2015, 18, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of psychoactive and intoxicating substances in legal highs
    Autorzy:
    Zukiewicz-Sobczak, W.
    Zwolinski, J.
    Chmielewska-Badora, J.
    Krasowska, E.
    Piatek, J.
    Sobczak, P.
    Wojtyla, A.
    Fornal, E.
    Kuczumow, A.
    Bilinski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/51459.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    “Legal highs” known also as “smarts”, “legal drugs” or “boosters” contain in their composition psychoactive substances the production, sale and possession of which are not prohibited in legislation. They are offered for sale under the cover of collectors’ items, a salt bath, aroma sticks, or plant fertilizer. Marketing was the reason for such high sales of these “highs” in Poland. The phenomenon became of concern when information became available about the first cases of tragic health consequences. Raising the awareness of youth about the level of imminent danger and serious consequences associated with the use of legal highs may be a very effective way to develop appropriate attitudes of young people, and in the light of their own health can help them take proper life decisions. “Legal highs” are substances of natural or synthetic origin having psychostimulating properties. These compounds may differ in chemical structure, potency, half-life, metabolism and severity of side effects. Their pharmacological activity is associated with changes in the neurotransmitter system. After higher doses of “legal highs” psychotic symptoms may occur: visual and auditory hallucinations resembling schizophrenic endogenous psychoses. An alarming fact is the underestimation of the adverse effect of these substances on human health. Any actions aimed at improving this situation are extremely important; therefore, in one of the key projects undertaken at the Institute of Rural Health in Lublin, in cooperation with other scientific institutes, concerned the analysis of a selected series of “legal highs”. This research was meant top serve as a source of information for science and medicine, and for popularizing knowledge about legal highs.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2012, 19, 2
    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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