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Wyszukujesz frazę "Fedotova, A." wg kryterium: Autor


Tytuł:
Żubrze eksponaty z lat 1811-1914 w europejskich kolekcjach naukowych - mało znany aspekt XIX-wiecznej gospodarki łowieckiej w Puszczy Białowieskiej
European bison specimens from 1811-1914 in European science collections - little known aspect of the 19th century game management in Białowieża Primeval Forest
Autorzy:
Samojlik, T.
Daszkiewicz, P.
Fedotova, A.
Powiązania:
https://bibliotekanauki.pl/articles/987196.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lowiectwo
historia
wiek XIX
Puszcza Bialowieska
gospodarka lowiecka
zubr
Bison bonasus
pozyskanie zwierzat
pozyskanie dla celow naukowych
pozyskanie dla celow muzealnych
pozyskanie lowieckie
pozwolenia na polowania
zbiory zoologiczne
zbiory muzealne
lata 1811-1914
european bison conservation
natural science history
białowieża primeval forest
game management
Opis:
The 19th century game management in Białowieża Primeval Forest (BPF), especially hunts for European bison, have been a subject of several works. The aspect of hunts motivated by research and museum needs have not been described in detail yet. The paper attempts at describing the administrative process behind such hunts and collecting all records of bison hunted or captured and carcasses acquired in BPF for museums, natural collections and universities in 1811−1914 (period covered by manuscript sources and published historical works with data on bison hunts available). Based on available sources, we calculated that in the period in question a total of 153 bison were hunted during ‘recreational' hunts (by tsars, their families and exalted guests with special tsars' permissions) and 56 were shot for purposes of study and research – therefore 27% out of 209 hunts had research motivations. Furthermore, 72 bison were captured alive (for zoos, cross−breeding and taming experiments) and carcasses of 89 bison (plus another 9 of unknown origin) were sent to museums and universities all around Europe. We believe that this little known aspect of the 19th century game management in BPF has had a significant impact on informing the scientific world and especially the general public about the European bison species, which in turn could have contributed to successful, international collaboration after the extinction of the species in the wild in 1919.
Źródło:
Sylwan; 2017, 161, 04; 341-352
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Features of Real Part of Admittance in the Nanocomposites $(Fe_{45}Co_{45}Zr_{10})_{x}(Al_2O_3)_{100 - x}$ Manufactured by the Ion-Beam Sputtering Technique with Ar Ions
Autorzy:
Kołtunowicz, T.
Zhukowski, P.
Fedotova, V.
Saad, A.
Larkin, A.
Fedotov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1503798.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Rf
73.22.-f
84.37.+q
72.20.Ee
Opis:
The temperature and frequency dependences of the admittance real part σ (T, f) in granular $(Fe_{45}Co_{45}Zr_{10})_{x}(Al_2O_3)_{100 - x}$ nanocomposite films around the percolation threshold $x_{C}$ were investigated. The behaviour of σ (T, f) vs. the temperature and frequency over the ranges 77-300 K and 50 Hz-1 MHz, respectively, displays the predominance of an activation (hopping) conductance mechanism for the samples below the percolation threshold $x_{C}$ and of a metallic one beyond the $x_{C}$ determined as 54 ± 2 at.%. The mean hopping range d for the nanoparticles diameter D was estimated at different metallic phase content x.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 35-38
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hopping Conductance in Nanocomposites $(Fe_{0.45}Co_{0.45}Zr_{0.10})_{x}(Al_2O_3)_{1 - x}$ Manufactured by Ion-Beam Sputtering of Complex Target in $Ar+O_2$ Ambient Gas
Autorzy:
Kołtunowicz, T.
Zhukowski, P.
Fedotova, V.
Saad, A.
Fedotov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1503812.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Rf
73.22.-f
84.37.+q
72.20.Ee
Opis:
We report the investigation of a real part of the admittance σ of granular nanocomposites $(Fe_{0.45}Co_{0.45}Zr_{0.10})_{x}(Al_2O_3)_{1 - x}$ with 0.30 < x < 0.70 in the dielectric (hopping) regime. An analysis of the σ(T, f, x) dependences in the as-deposited and annealed films over the temperature 77 K < T < 300 K and frequency 50 < f < $10^6$ Hz ranges displayed the predominance of an activation (hopping) conductance mechanism with dσ/ dT > 0 for the samples below the percolation threshold $x_{C}$ ≈ 0.76 ± 0.05. Based on the earlier models for hopping AC conductance, computer simulation of the frequency coefficient $α_{f}$ of hopping conductance depending on the probability of jump p, frequency f, and also on the shape of σ(f) curve was performed. The experimental and simulation results revealed a good agreement.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 39-42
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Noncoil-Like Inductance in Nanocomposites $(Fe_{0.45}Co_{0.45}Zr_{0.10})_{x}(Al_2O_3)_{1-x}$ Manufactured by Ion-Beam Sputtering of Complex Targets in $Ar+O_2$ Atmosphere
Autorzy:
Zhukowski, P.
Kołtunowicz, T.
Węgierek, P.
Fedotova, J.
Fedotov, A.
Larkin, A.
Powiązania:
https://bibliotekanauki.pl/articles/1503848.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
73.22.-f
81.40.Ef
84.37.+q
72.20.Ee
Opis:
This paper investigates the inductive contribution to AC conductance in the granular nanocomposites $(Fe_{0.45}Co_{0.45}Zr_{0.10})_{x}(Al_2O_3)_{1-x}$. The initial nanocomposites studied were manufactured in $Ar+O_2$ atmosphere by ion-beam sputtering of the target containing $Fe_{0.45}Co_{0.45}Zr_{0.10}$ and alumina stripes and then subjected to the annealing procedure in air over the temperature range 373 K < $T_{a}$ < 873 K. These samples, before and after annealing, were studied using the temperature 77 K < $T_{p}$ < 300 K and frequency 50 Hz < f < 1 MHz dependences of a real part of the admittance σ(T, f). Analysis of the observed σ (f, $T_{p}$) dependences for x < 0.5 demonstrated that in the studied samples the equivalent circuits with the capacitive and noncoil-like inductive contributions can be accomplished. Just in this case, the capacitive properties of RLC circuit with the phase angle - 90° ≤ $\Theta_{L}$ < 0° are exhibited at low frequencies and the inductive properties with 0° ≤ $\Theta_{H}$ < 90° become apparent at high frequencies. A value of the critical frequency $f_{R}$, where $\Theta_{H}$ changes sign, depends on the metallic phase concentration x, measuring temperature $T_{p}$, and annealing temperature $T_{a}$.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 43-45
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealing of $(CoFeZr)_{x}(CaF_2)_{100-x}$ Nanocomposites Produced by the Ion-Beam Sputtering in the Ar and $O_2$ Ambient
Autorzy:
Kołtunowicz, T.
Zhukowski, P.
Bondariev, V.
Fedotova, J.
Fedotov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400483.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Pq
79.20.Rf
81.40.Ef
72.80.Le
Opis:
This paper presents the investigations of electrical properties and effect of annealing on conductivity of $(CoFeZr)_{x}(CaF_2)_{100-x}$ nanocomposites produced by ion-beam sputtering in the Ar and $O_2$ ambient. Investigations into conductivity of $(CoFeZr)_{x}(CaF_2)_{100-x}$ nanocomposites depending on the measuring temperature and the annealing temperature have been performed. The application of a combined argon-oxygen beam brings about lowering of the potential barrier on the surface of nanoparticles. In the course of annealing the additional oxidation occurs. First it proceeds on the surface and then all through the metallic-phase particles.
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 932-934
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanisms of Carrier Transport in $Cu_x(SiO_2)_{1-x}$ Nanocomposites Manufactured by Ion-Beam Sputtering with Ar Ions
Autorzy:
Fedotov, A.
Mazanik, A.
Svito, I.
Saad, A.
Fedotova, V.
Czarnacka, K.
Koltunowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1402220.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.37.+q
72.80.Ga
73.22.-f
61.46.Df
64.60.ah
Opis:
The present paper investigates the temperature/frequency dependences of admittance Z in the granular $Cu_x(SiO_2)_{1-x}$ nanocomposite films around the percolation threshold $x_{C}$ in the temperature range of 4-300 K and frequencies of 20-10⁶ Hz. The behavior of low-frequency ReZ(T) dependences displayed the predominance of electrons hopping between the closest Cu-based nanoparticles for the samples below the percolation threshold $x_{C}$ ≈ 0.59 and nearly metallic behaviour beyond the $x_{C}$. The high-frequency curves ReZ(f) at temperatures T > 10 K for the samples with x < $x_{C}$ exhibited behavior close to ReZ(f) ≈ $f^{-s}$ with s ≈ 1.0 which is very similar to the known Mott law for electron hopping mechanism. For the samples beyond the percolation threshold (x > $x_{C}$), the frequency dependences of ReZ(f) displayed inductive-like (not capacitive) behaviour with positive values of the phase shift angles.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 883-886
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer, XRD, and SEM Study of FeAl-Based Powder Alloys with Nanoinclusions
Autorzy:
Zaleski, A.
Fedotova, J.
Ilyuschenko, A.
Talako, T.
Belyaev, A.
Letsko, A.
Stanek, J.
Powiązania:
https://bibliotekanauki.pl/articles/2046435.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Dk
81.20.Ev
82.80.Ej
Opis:
Peculiarities of phase composition and morphology in nanostructured (Fe$\text{}_{70}$Al$\text{}_{30}$)$\text{}_{1-x}$(Al$\text{}_{2}$O$\text{}_{3}$)$\text{}_{x}$ (x=64-80 wt.%) powder alloys prepared by self-propagated high temperature synthesis have been studied by $\text{}^{57}$Fe transmission Mössbauer spectroscopy, scanning electron microscopy, and X-ray diffraction. It has been established that phase composition of alloys has not been affected by Al$\text{}_{2}$O$\text{}_{3}$ contribution. Contrary, atomic arrangement in B2 FeAl phase depends on the volume fraction of Al$\text{}_{2}$O$\text{}_{3}$ resulting in the migration of Al atoms from B2 FeAl lattice.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 441-444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Crystal Structure in Dielectric $BaAl_2Si_2O_8$-Based Materials Depending on Preparation Conditions
Autorzy:
Bliznyuk, L.
Klimza, A.
Petrochenko, T.
Fedotova, V.
Karwat, C.
Powiązania:
https://bibliotekanauki.pl/articles/1366306.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
Opis:
Crystal structure formation of $BaAl_2Si_2O_8$ known as polymorphic compound is investigated in present work depending on conditions of preparation. Characteristics of ceramics have been studied for different modifications of crystal structure. Additional technologic operations (grinding with following heat treatment) have been found to result in polymorphic transformation. Dielectric properties of $BaAl_2Si_2O_8$ ceramics have been studied for hexagonal, monoclinic crystal structure modifications as well as for that based on phase mixture. It has been shown that the sintering of ceramic material based on the monoclinic crystal structure modification of $BaAl_2Si_2O_8$ takes place in temperature diapason of 1300-1350°C. Sintering of material with the hexagonal crystal structure modification occurs in temperature diapason of 1450-1500°C. Ceramics materials based on compound $BaAl_2Si_2O_8$ are found to have low porosity, high Q-factor and dielectric characteristics, allowing use of these ceramic materials for production of resonators and other microwave equipments.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1348-1350
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoresistance in n-Si/$SiO_2$/Ni Nanostructures Manufactured by Swift Heavy Ion-Induced Modification Technology
Autorzy:
Fedotova, J.
Ivanou, D.
Ivanova, Y.
Fedotov, A.
Mazanik, A.
Svito, I.
Streltsov, E.
Saad, A.
Tyutyunnikov, S.
Kołtunowicz, T.
Demyanov, S.
Fedotova, V.
Powiązania:
https://bibliotekanauki.pl/articles/1504014.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
81.05.Rm
73.22.-f
73.50.Jt
Opis:
A study of magnetotransport in the n-Si/$SiO_2$/Ni nanostructures with granular Ni nanorods in $SiO_2$ pores was performed over the temperature range 2-300 K and at the magnetic fields induction up to 8 T. The n-Si/$SiO_2$/Ni Schottky nanostructures display the enhanced magnetoresistive effect at 25 K due to the impurity avalanche mechanism.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 133-135
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Voltage and Current Resonance in Nanocomposite $(FeCoZr)_x(CaF_2)_{100-x}$ Produced by Ion-Beam Sputtering in Pure Argon Atmosphere
Autorzy:
Koltunowicz, T.
Zukowski, P.
Bondariev, V.
Fedotov, A.
Svito, I.
Fedotova, J.
Saad, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402224.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Pq
79.20.Rf
81.40.Ef
72.80.Le
Opis:
In this paper the results of investigations of electrical properties of metal-dielectric nanocomposites $(FeCoZr)_x(CaF_2)_{100-x}$ are presented. The samples with the metallic phase content x=45.7 at.% were produced by ion-beam sputtering method in pure argon atmosphere, and subsequently annealed at 398 K for 15 min. The measurements of electrical properties were performed in the frequency range from 50 Hz to 1 MHz. The frequency dependences of phase angle θ, capacity $C_{p}$, conductivity σ and dielectric loss factor tanδ were measured at seven different temperatures ranging from 148 K to 263 K. It was found that the nanocomposite exhibits the phenomena of voltage resonance and current resonance, characteristic of the conventional RLC circuits with series and parallel connections of elements.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 897-900
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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