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Wyświetlanie 1-15 z 40
Tytuł:
Admittance and Permittivity in Doped Layered $TlGaSe_2$ Single Crystals
Autorzy:
Dawood, S.
Fedotov, A.
Mammadov, T.
Zukowski, P.
Koltunowicz, T.
Saad, A.
Drozdov, N.
Powiązania:
https://bibliotekanauki.pl/articles/1365735.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Ey
84.37.+q
64.70.Nd
Opis:
In doped $TlGaSe_2$ crystals the phase transitions at low temperatures (100-170 K) were observed using admittance and dielectric spectroscopy in a temperature range of 80-320 K. The admittance and permittivity measurements in the studied samples indicated that after Fe or Tb doping by impurities with concentrations $N_\text{imp}$ < 0.5 at.% nonequilibrium electronic phase transition is observed. Doping with $N_\text{imp}$ > 0.5 at.% resulted in full suppression of this phase transition presence.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1267-1270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Allocation and Properties of Iron States in Cd$\text{}_{1-x}$Fe$\text{}_{x}$Te in Forbidden Gap Energy Range
Autorzy:
Hołda, A.
Rodzik, A.
Melnikov, A.
Żukowski, P. W.
Powiązania:
https://bibliotekanauki.pl/articles/1872765.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
78.20.Jq
78.60.Hk
Opis:
The use of different experimental methods (reflectivity, absorption, photoconductivity and cathodoluminescence) allowed us to confirm the existence of the deep donor-like state of iron and present allocation and properties of the iron states in Cd$\text{}_{1-y}$Fe$\text{}_{x}$Te (0 ≤ x ≤ 0.05) at 300 K and 77 K in the forbidden gap energy range. It was concluded that the increase in width of the forbidden gap with the change of temperature from 300 K to 77 K leads mainly to the rise of the energy distance between the donor-like iron state $\text{}^{5}$E and the bottom of the conduction band.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 357-360
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropic Magnetoresistance of Ni Nanorod Arrays in Porous SiO₂/Si Templates Manufactured by Swift Heavy Ion-Induced Modification
Autorzy:
Fedotova, J.
Ivanou, D.
Mazanik, A.
Svito, I.
Streltsov, E.
Saad, A.
Zukowski, P.
Fedotov, A.
Bury, P.
Apel, P.
Powiązania:
https://bibliotekanauki.pl/articles/1402223.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.Km
81.15.Jj
75.47.De
Opis:
In this work anisotropic magnetoresistance in nanogranular Ni films and Ni nanorods on Si(100) wafer substrates was studied in wide ranges of temperature and magnetic field. To produce Ni films and nanorods we used electrochemical deposition of Ni clusters either directly on the Si substrate or into pores in SiO₂ layer on the Si substrate. To produce mesopores in SiO₂ layer, SiO₂/Si template was irradiated by a scanned beam of swift heavy 350 MeV ¹⁹⁷Au²⁶⁺ ions with a fluence of 5×10⁸ cm¯² and then chemically etched in diluted hydrofluoric acid. Pores, randomly distributed in the template have diameters of 100-250 nm and heights about 400-500 nm. Comparison of temperature dependences of resistance and magnetoresistance in Ni films and n-Si/SiO₂/Ni structures with Ni nanorods showed that they are strongly dependent on orientation of magnetic field and current vectors relative to each other and the plane of Si substrate. Moreover, magnetoresistance values in n-Si/SiO₂/Ni nanostructures can be controlled not only by electric field applied along Si substrate but also by additionally applied transversal bias voltage.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 894-896
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of HPLC-MS with Electrospray Ionization for the Qualitative and Quantitative Analysis of Antibiotics in Pharmaceutical Formulation
Autorzy:
Likhtarovich, A.
Luhin, V.
Sovastei, O.
Zukowski, P.
Dado, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402227.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.10.Bi
33.15.Ta
82.80.-d
Opis:
This study describes the application of electrospray ionization mass spectrometry in order to identify ten antibiotics (macrolides, penicillins, aminoglycosides). An optimum procedure was developed for determination of antibiotics of different grade. Positive ion spectra of most antibiotics are higher in intensity including an [M+H]⁺ ion and produce less fragmentation and are more informative compared to the negative ion spectra. The group of antibiotics exhibits the same characteristic fragmentation. The data base was developed for identification of antibiotics comparing of their molecular and fragment ions. The results of the study showed that the method with electrospray ionization is simple and quick which is useful in the routine determination of antibiotics and in their pharmaceutical dosage forms.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 901-904
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie energii łuku prądu stałego w zależności od biegunowości podłączenia styków łącznika
Testing dc arc energy depending on the polarity of contacts connection
Autorzy:
Żukowski, P.
Kozak, C.
Powiązania:
https://bibliotekanauki.pl/articles/187441.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG
Tematy:
badanie energii łuku prądu stałego
łącznik W10
napięcie
testing dc arc energy
voltage
W10 connector
Opis:
W artykule przedstawiono wyniki badań dotyczących wpływu biegunowości napięcia stałego na wartość energii łuku palącego się w przerwie międzystykowej łącznika W10. Badania zostały przeprowadzone w zależności od rozwiązań konstrukcyjnych i rodzaju materiału styków łącznika.
Testing DC arc energy depending on the polarity of contacts connection. The article features the results of tests concerning the influence of dc voltage on the energy value of an arc burning in the gap between the contacts of a W10 connector. The tests were carried out with respect to different structure solutions and different kinds of contact materials.
Źródło:
Mechanizacja i Automatyzacja Górnictwa; 2010, R. 48, nr 7, 7; 137-140
0208-7448
Pojawia się w:
Mechanizacja i Automatyzacja Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carex secalina [Cyperaceae], a species critically endangered in Europe: from propagule germination to propagule production
Autorzy:
Zukowski, W
Lembicz, M.
Olejniczak, P.
Bogdanowicz, A.
Chmiel, J.
Rogowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/57902.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
abundance
endangered species
fertility
seedling
Cyperaceae
Carex secalina
first reproduction
Europe
halophyte
field
age
germination
Opis:
The size and reproduction ability of the three field populations of Carex secalina Willd. ex Wahlenb. have been assessed. In the parallel garden study selected traits from the life history of the species have been studied, such as age at first reproduction, fertility, the size of seeds, their germination ability and size of seedlings. The populations of C. secalina discovered in Poland in 2000 are characterised by small abundance and small area. All individuals from the three populations in the garden produced generative shoots in the third year of life. Statistically significant differences between the populations were found in the production of shoots with unisexual spikes and bisexual ones, the latter had not been reported in the hitherto literature on the species. The seeds started germinating after a 6-months rest. The first seedlings were observed in the first decade of May. The largest seedlings were noted in the population producing the smallest seeds. The results contribute to explaining the renewal of the populations of this species in the field.
Źródło:
Acta Societatis Botanicorum Poloniae; 2005, 74, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cathodoluminescence Study of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te and Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te
Autorzy:
Hołda, A.
Rodzik, A.
Melnikov, A. A.
Żukowski, P. W.
Powiązania:
https://bibliotekanauki.pl/articles/1933757.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Hk
78.55.Et
Opis:
The cathodoluminescence spectra for Cd$\text{}_{1-x}$Μn$\text{}_{x}$Te (0 < x ≤ 0.7) and Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te (0 < x ≤ 0.6) at room and liquid nitrogen temperature have been presented and discussed. Especially, the influence of increasing temperature and Mn content on cathodoluminescence spectra. The cathodoluminescence emission in Ζn$\text{}_{1-x}$Mn$\text{}_{x}$Te (Cd$\text{}_{1-x}$Μn$\text{}_{x}$Te) centered at ≈ 1.95 eV (2.0 eV) and ≈ 2.2 eV (2.5 eV) are ascribed to Stokes-shifted $\text{}^{4}$Τ$\text{}_{1}$($\text{}^{4}$G) → $\text{}^{6}$A$\text{}_{1}$($\text{}^{6}$S) and $\text{}^{4}$Τ$\text{}_{2}$($\text{}^{4}$G) → $\text{}^{6}$A$\text{}_{1}$($\text{}^{6}$S) internal transitions of Mn$\text{}^{+2}$ within the 3d$\text{}^{5}$ state, respectively.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 739-742
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elemental Composition, Topography and Wettability of $Pb_{x}Sn_{1 - x}S$ Thin Films
Autorzy:
Tashlykov, I.
Turavets, A.
Gremenok, V.
Żukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1366292.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
06.30.Bp
Opis:
PbSnS thin films were prepared by hot-wall vacuum evaporation. The Rutherford backscattering technique was employed for the investigation of $Pb_{x}Sn_{1 - x}S$ thin films composition. With a help of atomic force microscopy the main stages in the development of the thin films were characterized. Contact angle measurements of water drop on $Pb_{x}Sn_{1 - x}S$ thin films have been conducted on our original setup.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1339-1343
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Characterization of Transparent Tin Dioxide Films with Variable Stoichiometric Composition
Autorzy:
Ksenevich, V.
Adamchuk, D.
Odzhaev, V.
Zukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1402213.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Le
78.30.-j
81.15.Cd
Opis:
Tin dioxide films with variable stoichiometric composition were fabricated by means of dc magnetron sputtering followed by a 2-stage annealing process. The structural and electrical properties of tin dioxide films were investigated by means of the Raman spectroscopy and impedance spectroscopy, respectively. It was found that crystallinity and grain size of tin dioxide films increase with the increasing annealing temperature. The most conductive samples were obtained at the annealing temperature 375°C. Increasing of the impedance of films annealed at higher temperatures is explained by decrease of the concentration of oxygen vacancies.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 861-863
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Research of Superhard (Zr-Ti-Cr-Nb)N Coatings
Autorzy:
Bondar, O.
Postolnyi, B.
Kravchenko, Yu.
Shypylenko, A.
Sobol, O.
Beresnev, V.
Kuzmenko, A.
Zukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1402215.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.-w
62.20.Qp
Opis:
This work presents the results of (Zr-Ti-Cr-Nb)N superhard coatings research. The samples were fabricated by the vacuum-arc deposition method (Arc-PVD). Structure, composition and properties of these coatings were studied. The study of coatings was carried out using scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. Hardness measurements and adhesion tests were performed. The coatings thickness was up to 6.2 μ m, nanocrystallites sizes ranged from 4 to 7.3 nm. Values of hardness and cohesive strength were H=43.7 GPa and $L_{C}$=62.06 N, respectively. The optimal conditions for coating deposition were found.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 867-870
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Cone-Shaped Inclusions and Line Defects on the Cz-Si Wafer Surface by the Helium Implantation and DC Nitrogen Plasma Treatment
Autorzy:
Frantskevich, N.
Mazanik, A.
Frantskevich, A.
Kołtunowicz, T.
Żukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1503982.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.uf
73.20.Hb
Opis:
The general goal of this work is to investigate the defects formed on the surface of the Cz-Si wafers subjected to helium implantation, vacuum annealing and nitrogen plasma treatment. The performed scanning electron microscopy study has shown that in the general case two types of surface defects can be formed: cone-shaped inclusions with the base diameter of 0.2-2 μm and the ratio of diameter to height of approximately 1:1, as well as crystallographically oriented line defects with the length equal to 0.2-2 μm. The concentration of these defects depends on the conditions of implantation and plasma treatment.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 105-107
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Annealing on the Electrical Properties οf Cz-Si Wafers Previously Subjected to the Hydrogen Ion-Beam Treatment
Autorzy:
Fedotov, A.
Korolik, O.
Mazanik, A.
Kołtunowicz, T.
Żukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1503985.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.uf
81.40.Ef
Opis:
The main goal of this work is to establish the influence of annealing on the properties of Cz-Si wafers previously subjected to the hydrogen ion-beam treatment at 25 or 300-350°C. It is demonstrated by the conducted study that, despite similarity in the effects of the hydrogen ion-beam treatment at different temperatures on some electrical properties of the wafers (photovoltage spectra, thermoelectromotive force sign), thermal stability of changes in these properties due to the hydrogen ion-beam treatment depends on the hydrogenation temperature.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 108-110
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Nanoscale TiN/MoN Multilayered Systems, Fabricated Using Arc Evaporation
Autorzy:
Pogrebnjak, A.
Bondar, O.
Abadias, G.
Eyidi, D.
Beresnev, V.
Sobol, O.
Postolnyi, B.
Zukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1402193.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.-w
62.20.Qp
62.25.-g
Opis:
Using the vacuum-arc evaporation method we fabricated periodic multilayered TiN/MoN structures with different bilayer periods λ ranging from 8 to 100 nm. We found that molybdenum nitride and titanium nitride layers grown on steel show local partial epitaxy and columnar growth across interfaces. A molybdenum-titanium carbide interlayer was evidenced between the substrate and the multilayer. Molybdenum nitride and titanium nitride layers contain small (5÷30 nm) grains and are well crystallized with (100) preferred orientation. They were identified as stoichiometric fcc TiN and cubic γ-M₂N. Non-cubic molybdenum nitride phases were also detected. The hardness of the obtained structures achieved great values and maximal hardness was 31÷41.8 GPa for the multilayered structure with a 8 nm period. Hardness of the obtained coatings is 25÷45% higher in comparison with the initial single-layer nitride coatings, plasticity index of multilayered structure is 0.075.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 836-840
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ion Beam Formation of Electrocatalysts for Direct Methanol and Ethanol Fuel Cells on the Basis of Carbon Catalyst Supports
Autorzy:
Poplavsky, V.
Dorozhko, A.
Luhin, V.
Matys, V.
Zukowski, P.
Czarnacka, K.
Powiązania:
https://bibliotekanauki.pl/articles/1033764.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
81.15.Jj
81.05.U-
82.45.Jn
82.80.Fk
82.80.Yc
88.20.ff
88.30.pd
88.30.pf
Opis:
Ion-beam modification of materials whose service properties are mainly controlled by the surface composition is of especial interest, in particular, for electrocatalysts, namely electrodes of fuel cells - perspective chemical current sources. A catalyst is needed for effective operation of fuel cell. In this paper active layers of the electrocatalysts were prepared by ion beam assisted deposition of catalytic (platinum) and activating (cerium) metals onto carbon (AVCarb® Carbon Fiber Paper P50 and Toray Carbon Fiber Paper TGP-H-060 T) catalyst supports. Formation of layers by ion beam assisted deposition by means of the deposition of metal and mixing of precipitating layer with the substrate by accelerated ions of the same metal, was carried out. Metal deposition and mixing between the precipitable layer and surface of the substrate by accelerated (U=10 kV) ions of the same metal were conducted from a neutral vapor fraction and plasma of vacuum arc discharge of a pulsed electric arc ion source. Study of the morphology and composition of layers was carried out by the scanning electron microscopy, energy dispersive X-ray microanalysis, X-ray fluorescence analysis, and the Rutherford backscattering spectrometry methods. According to the investigations with the use of cyclic voltammetry, the electrocatalysts with the prepared layers exhibited catalytic activity in the reactions of electrochemical oxidation of methanol and ethanol, which form the basis for the principle of operation of low temperature direct methanol and direct ethanol fuel cells.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 278-282
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jump Mechanism of Electric Charge Transfer in Gallium Arsenide Exposed to Polyenergy Implantation with $H^{+}$ Ions
Autorzy:
Żukowski, P.
Węgierek, P.
Billewicz, P.
Kołtunowicz, T.
Komarov, F.
Powiązania:
https://bibliotekanauki.pl/articles/1504001.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.uj
61.72.Cc
72.80.Ey
Opis:
The article presents the experimental results on electric conductivity investigations of gallium arsenide, exposed to polyenergy implantations with $H^{+}$ ions, depending on alternating current frequency (50 Hz ÷ 5 MHz), testing temperature (liquid nitrogen temperature ÷ 373 K) and the temperature of 15 min isochronous annealing (293 ÷ 663 K). It has been found that the obtained dependences σ ($T_{p},$ f) result from a jump mechanism of electric charge transfer between the radiation defects that form in the process of ion implantation. Correlations between annealing of various types of radiation defects and conductivity characteristics σ ($T_{p}$, f) have also been discussed.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 125-128
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 40

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