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Wyszukujesz frazę "Kempiński, M." wg kryterium: Autor

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    Wyświetlanie 1-12 z 12
    Tytuł:
    Size Modification of Nanographite System of Activated Carbon Fibers Studied by EPR
    Autorzy:
    Kempiński, M.
    Kempiński, W.
    Śliwińska-Bartkowiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043617.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Uv
    73.20.-r
    73.22.-f
    76.30.-v
    74.78.Na
    Opis:
    We report results of EPR measurements of activated carbon fibers. Experiments made for pristine activated carbon fibers and activated carbon fibers with adsorbed molecules (CCl$\text{}_{4}$, C$\text{}_{6}$H$\text{}_{5}$NO$\text{}_{2}$, and H$\text{}_{2}$O) confirmed the localized character of paramagnetic centers observed in the system. Pristine activated carbon fibers are characterized by single Lorentzian line. Broader component of EPR signal appears when guest molecules are adsorbed in nanopores. The strongest localization is observed for water-filled activated carbon fibers nanopores (with hydrophobic pore walls) where changes in distance between nanographite particles were monitored by the g-shift to higher values. This process is related to stronger spin-orbit interaction of electrons trapped at nanographite particles compressed by guest molecules.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 339-343
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Localized states in nanocarbons
    Autorzy:
    Kempiński, W.
    Kempiński, M.
    Markowski, D.
    Łoś, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148234.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    activated carbon fibers (ACF)
    carbon nanotubes
    electron paramagnetic resonance (EPR)
    fullerenes
    Opis:
    Localization phenomenon is studied in different modern nanocarbon materials: pristine C60, C60-fullerides, carbon nanotubes and graphene-based structures in the form of activated carbon fibers built of quantum dot-like basic structural units. Two experimental methods are used to define the localization and population control of spins (charge carriers) in the nanocarbon materials – electron paramagnetic resonance (EPR) and direct current (d.c.) electrical conductivity measurements. Results are discussed in the frame of the possible applications of the aforementioned materials in the molecular electronics or spintronics.
    Źródło:
    Nukleonika; 2013, 58, 3; 371-373
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wetting of nanostructurized sapphire and gold surfaces
    Autorzy:
    Kempiński, M.
    Jenczyk, J.
    Jurga, S.
    Śliwińska-Bartkowiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054983.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.08.Bc
    68.35.Np
    68.35.Ct
    Opis:
    We present the results of preliminary experiments regarding research on the contact angle measurements of various liquids on solid surfaces with different morphology. The aim was to get insight into the dependence of wetting phenomena on the nanoscale surface roughness. Flat and nanostructurized surfaces of gold and sapphire were used in the experiments. Four liquids - bromobenzene, water, mercury, and gallium - covering a broad range of surface tension values were used to check how varying roughness influences wetting in the systems with different adhesion/cohesion ratio. Structurization was anisotropic, which resulted in the very interesting behaviour of the examined liquids on the selected surfaces. Significant change of the wetting properties was observed as well as a strong dependence on the surface morphology.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 185-188
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR and Impedance Measurements of Graphene Oxide and Reduced Graphene Oxide
    Autorzy:
    Kempiński, M.
    Łoś, S.
    Florczak, P.
    Kempiński, W.
    Jurga, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033701.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Vp
    76.30.-v
    Opis:
    We report the observations of electron paramagnetic resonance and impedance measurements of graphene oxide and reduced graphene oxide performed in the wide temperature range in order to get insight into the electronic properties of graphene-based materials and the role of oxygen functionalities in the charge carrier transport phenomena. In such systems the strong spin localization, hopping charge carrier transport as well as the formation of adsorption layers are observed, all the phenomena changing significantly after the heavily oxidized graphene is reduced.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 81-85
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Transport Properties and Growth Mechanisms of Ni-Fe/Au/Co/Au Multilayers from In Situ Conduction Measurements
    Autorzy:
    Błaszyk, M.
    Kempiński, M.
    Buchta, K.
    Chomiuk, P.
    Luciński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534187.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.50.-h
    73.61.-r
    75.70.Cn
    72.15.-v
    Opis:
    In the following we present the role of surface scattering at Au/Co and Au/Ni-Fe interfaces in Ni-Fe/Au/Co/Au multilayers deposited in different temperatures. Specularity parameter, which describes the electron scattering, is calculated from fitting in situ collected conductance data with the Fuchs-Namba-Tesanovic model. Application of the parallel resistors model enabled to depict changes between Au/Co and Au/Ni-Fe interfaces within multilayers for each repetition. The correlation between enhanced grain boundary scattering for higher deposition temperatures and surface roughness of Ni-Fe/Au/Co/Au multilayers is found.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 861-863
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetization Reversal in Cobalt Nanocolumn Structures Obtained by Glancing Angle Deposition
    Autorzy:
    Buchta, K.
    Schmidt, Ch.
    Trykowski, G.
    Biniak, S.
    Kempiński, M.
    Luciński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428548.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    73.50.-h
    73.61.-r
    Opis:
    An advanced deposition technique known as glancing angle deposition was used to fabricate randomly seeded magnetic cobalt columnar nanostructures. The existence of nanocolumns was confirmed by the cross-section scanning electron microscopy. The evolution in the magnetization reversal mechanism as a function of the film thickness was investigated. The coercivity $H_{C}$ and $M_{R}//M_{S}$ ratio (where $M_{R}$ and $M_{S}$ denote the remanent and saturation magnetization, respectively), derived from the magnetic hysteresis loops, are discussed as a function of the angle between the external magnetic field and the surface normal. The direction of the magnetization easy/hard axis and the columns inclination angle were determined on the basis of the angular dependences of the $H_{C}$ and the $M_{R}//M_{S}$. A crossover from the coherent rotation, based on the Stoner-Wohlfarth model, to the curling reversal mode was observed.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1222-1224
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Conductivity of Carbon Nanoparticles Stimulated by Electric Field
    Autorzy:
    Markowski, D.
    Kempiński, W.
    Kempiński, M.
    Trybuła, Z.
    Kaszyńska, K.
    Śliwińska-Bartkowiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535906.pdf
    Data publikacji:
    2010-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.22.Pr
    73.21.La
    73.23.Hk
    73.25.+i
    73.63.-b
    73.23.-b
    Opis:
    Host-guest interactions can be the unique method of spin manipulation in nanoscale. Strong changes in spin localization are generated when potential barriers between nanographitic units of activated carbon fibers are modified by interaction with adsorbed molecules. Stronger modifications occur when dipolar guest molecules are stimulated with external electric field. We report experimental results which show the influence of electric field on the spin localization in activated carbon fibers.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 3; 457-458
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of Laminar Flow in Pipelines of Homogenous Alum Sludge Approximated with use of the Vočadlo Model for Viscoplastic Liquids
    Charakterystyka laminarnego płynięcia w rurociągach jednorodnych osadów pokoagulacyjnych aproksymowanych modelem cieczy plastyczno-lepkich Vočadli
    Autorzy:
    Kempiński, J.
    Sozański, M. M.
    Dymaczewski, Z.
    Świerzko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/205416.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alum sludge
    rheology
    hydrotransport
    Reynolds number
    osad pokoagulacyjny
    reologia
    liczba Reynoldsa
    Opis:
    The study presents the manners of determination of the Darcy friction factor λ for a homogenous hydromixture of alum sludge of varied hydration and temperature for the laminar flow zone. The rheological evaluation of the hydromixture as a viscoplastic body has been conducted with use of measurements of viscosity. The curves of flow were approximated with use of the generalized Vočadlo model. The Darcy friction factor λ of the pipeline was determined with use of the non-dimensional criterion λ(Regen) and λ(Re, He).
    Praca przedstawia sposoby określenia współczynnika oporów rurociągu λ, dla jednorodnej hydromieszaniny osadów pokoagulacyjnych o różnym uwodnieniu i różnej temperaturze, dla laminarnej strefy przepływu. Ocenę reologiczną hydromieszaniny, jako ciała plastyczno-lepkiego, wykonano na podstawie pomiarów wiskozymetrycznych, przy zastosowaniu do aproksymacji krzywych płynięcia uogólnionego modelu Vočadli. Określenie współczynnika oporu rurociągu λ przeprowadzono z wykorzystaniem bezwymiarowego kryterium λ(Regen) oraz λ(Re, He).
    Źródło:
    Archives of Environmental Protection; 2014, 40, 4; 39-51
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity of $MgB_2$ Layers Prepared on Silicon Substrate by Implantation of Magnesium Ions into Boron Substrate
    Autorzy:
    Trybuła, Z.
    Kempiński, W.
    Łoś, Sz.
    Kaszyńska, K.
    Trybuła, M.
    Piekoszewski, J.
    Werner, Z.
    Barlak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536977.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.-b
    74.78.-w
    Opis:
    The results of investigation of the $MgB_2$ layers prepared on silicon substrate by implantation of Mg ions into boron substrate are presented. After implantation the annealing processes were carried out at temperatures 673 K, 773 K, and 873 K in a furnace in an atmosphere of flowing Ar-4%$H_2$ gas mixture. The samples were characterized by: four-probe electric conductivity measurements and magnetically modulated microwave absorption. Our results showed that due to silicon substrate the diffusion of implanted Mg ions into boron materials should be limited, and the superconducting phase forms a continuous $MgB_2$ layer and the resistivity for all samples fall down to zero below $T_{c}$. The transition temperature $T_{c}$ becomes higher with increasing annealing temperature: $T_{c}$=18 K (for annealing at $T_{A}$=673 K), $T_{c}$=20 K (for annealing at $T_{A}$=773 K), and $T_{c}$=27 K (for annealing at $T_{A}$=873 K).
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 323-325
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting Regions and Kondo Effect of MgB$\text{}_{2}$ Formed by Implantation of Magnesium Ions into Boron Substrate
    Autorzy:
    Trybuła, Z.
    Kempiński, W.
    Andrzejewski, B.
    Piekara-Sady, L.
    Kaszyński, J.
    Trybuła, M.
    Piekoszewski, J.
    Stanisławski, J.
    Barlak, M.
    Richter, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046803.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.-b
    74.78.-w
    Opis:
    The results of investigation of the polycrystalline boron implanted by magnesium and argon plasma pulse treatment are presented. The four-probe electric conductivity measurements and magnetically modulated microwave absorption showed the presence of superconducting islands below the temperature of 25 K. Below T=23 K we detected the Kondo effect, a logarithmic increase in the resistivity as the temperature is lowered, due to iron impurity.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 657-660
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Evolution of Superconducting Phase $MgB_x$
    Autorzy:
    Łoś, Sz.
    Kempiński, W.
    Piekara-Sady, L.
    Andrzejewski, B.
    Jurga, W.
    Kaszyńska, K.
    Piekoszewski, J.
    Werner, Z.
    Barlak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812318.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.-b
    74.78.-w
    Opis:
    Thin layers of $MgB_x$ were studied in order to define evolution of superconducting phase after Mg ions implantation into boron substrate. Three fluencies of energies 140, 80, and 40 keV were used to establish proper stoichiometry to synthesize homogeneous $MgB_2$ film. Additionally, the annealing processes were carried out at temperatures 400, 500, and 600°C in a furnace in an atmosphere of flowing $Ar-4%H_2$ gas mixture. The quality of the superconducting material was examined by magnetically modulated microwave absorption, and magnetic and resistivity measurements. The results showed that $T_c$ becomes higher with increasing annealing temperature. However, the fraction of superconducting phase decreases, due to partial evaporation of Mg ions and their deeper migration into boron substrate.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 179-184
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Superconducting Regions of MgB_2 by Implantation of Boron Ions into Magnesium Substrate
    Autorzy:
    Trybuła, Z.
    Kempiński, W.
    Andrzejewski, B.
    Piekara-Sady, L.
    Kaszyński, J.
    Piekoszewski, J.
    Werner, Z.
    Richter, E.
    Prokert, F.
    Stanisławski, J.
    Barlak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043433.pdf
    Data publikacji:
    2005-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.-b
    74.78.-w
    Opis:
    The results of investigation of the MgB$\text{}_{2}$ inter-metallic compound with the use of boron ions implantation and plasma pulse treatment are presented. The samples were characterized by: four-probe electric conductivity measurements, magnetically modulated microwave absorption, and magnetic measurements. For hydrogen and argon pulsed plasma treatment the samples with T$\text{}_{c}$ ranging from 10 K to 32 K were obtained. The superconducting phase does not form a continuous layer since the resistivity does not fall down to zero. Apparently, separate islands of superconducting phase are connected through metallic Mg paths. All samples are still below the percolation threshold.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 1; 165-170
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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