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Wyświetlanie 1-15 z 92
Tytuł:
Pressure Influence on the Curie Temperature
Autorzy:
Rutkowski, J.
Wojtczak, L.
Zajac, Š.
Powiązania:
https://bibliotekanauki.pl/articles/1506985.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.40.-s
75.50.Cc
81.40.Vw
64.30.Ef
Opis:
The pressure dependence of the ferromagnetic-paramagnetic phase transition temperature $T_{C}$ (p) is of high interest due to its direct technological implications. The theoretical investigations of the Curie temperature $T_{C}$ (p) considered in the ferromagnetic crystals have been studied employing various methods of calculations. The present paper is devoted to its description by means of the pseudoharmonic approximation approach.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 745-746
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thin Films Investigations by Means of Spin-Wave Resonance
Autorzy:
Maksymowicz, A. Z.
Maksymowicz, L. J.
Whiting, J. S. S.
Powiązania:
https://bibliotekanauki.pl/articles/1891792.pdf
Data publikacji:
1991-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.50.+g
76.30.-v
73.90.+f
Opis:
Magnetic resonance technique may successfully be applied to determine some basic parameters such as g-factor, magnetization M$\text{}_{s}$ or anisotropy energy constant K$\text{}_{u}$ in thin magnetic films. These parameters are obtained from a ferromagnetic resonance experiment when uniform precession of M$\text{}_{s}$ takes place. From spin-wave resonance one may extract very valuable information on the exchange constant A or the surface conditions characterized by the surface anisotropy energy (or pinning parameters ρ). In fact, it is only spin-wave resonance or similar techniques which allow for measurements of A, ρ or the coupling constant K$\text{}_{c}$ between ferromagnetic sublayers in multi-layered structure. The magnetic phase diagram, temperature dependence of the spin-waves stiffness constant, and the anisotropy energy constant may also be listed as less common examples of spin-wave resonance technique application for the investigation of thin films. This paper presents a theoretical approach to typical examples of experimental results and their interpretation from spin-wave resonance measurements.
Źródło:
Acta Physica Polonica A; 1991, 80, 5; 665-673
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Complex Permittivity of Oil-Based Ferrofluid in Magnetic Field
Autorzy:
Kúdelčík, J.
Hardoň, Š.
Varačka, L.
Powiązania:
https://bibliotekanauki.pl/articles/1030262.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
77.22.Gm
77.22.Ch
Opis:
The changes of dielectric parameters in oil-based ferrofluid have been measured in an external magnetic field. The frequency dependent real permittivity and the dissipation factor were measured within the frequency ranges from 1 mHz to 2 MHz by a capacitance method. These parameters have been studied in combined electric and magnetic field, when fields were parallel and perpendicular. The Cole-Cole model has been used to analyze measured data. When a magnetic field was applied, the interaction between the magnetic field and magnetic moments of nanoparticles led to the aggregation of magnetic nanoparticles to new structures - thick chains which had influence on the value of dielectric permittivity. At constant magnetic field the dependence of real permittivity and tanδ on angle between the electric and magnetic field (anisotropy) were measured, too. The various influences of magnetic field development on the investigated liquid are discussed.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 931-933
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perimeter Security System Based on SAW Vibration Sensor
Autorzy:
Filipiak, J.
Steczko, G.
Kostrzewa, S.
Wcisło, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/1401903.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.65.Dq
43.20.Ye
Opis:
This paper presents the concept of a perimeter protection system with acceleration sensors with the acoustic surface wave. The system consists of subsystems. Subsystems are connected with a monitoring centre. Every subsystem consists of an identical set of acceleration sensors with the acoustic surface wave, a measurement generator and a quadrature phase demodulator and a reference generator, the frequency of which is different in every subsystem. The acoustic surface wave acceleration sensors are of a different frequency of free vibrations. The spectrum of the output signal from a subsystem is situated around the frequency which equals the difference between the measuring generator frequency and the reference generator frequency. Therefore the spectrum of every vibrating sensor is located in a different known frequency range. The analysis of the spectrum of signals from subsystems performed in the monitoring center allows monitoring the vibration status of every sensor included in a system. A system can consist of many identical acoustic surface wave acceleration sensor sets. This allows constructing a perimetrical protection system with acoustic surface wave acceleration sensors of parameters of which are comparable to parameters of presently offered perimeter protection systems. Results of the experimental research of the operation of the acoustic surface wave acceleration sensor in a subsystem are presented.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 408-413
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of the Measurement Setup for Examination of Acoustic Field Distribution Inside Cylindrical Ducts for Axisymmetric Excitation
Autorzy:
Gorazd, Ł.
Jurkiewicz, J.
Raab, S.
Snakowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400096.pdf
Data publikacji:
2013-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.20.Rz
43.20.Mv
Opis:
The aim of the paper is to present results of examination of the acoustic pressure field inside a model of a cylindrical duct. Measurements of the root mean square acoustic pressure were carried out using a new measurement setup, first in conditions allowing for propagation of the plane wave only, and next - by increasing the excitation frequency - with successive higher modes also taken in account. Two types of hard-walled cylindrical ducts were examined corresponding to mathematical models known as the infinite duct and the semi-infinite duct. A dedicated measurement setup is presented as well as the successive stages of its modification. In order to verify the modified measuring system, the first stage of the research work consisted in excitation of the axisymmetric modes only and assessing the degree of symmetry represented by the measurement data Significant improvement of the compatibility of the obtained measurement results with theoretical predictions was observed in the explored frequency band 800-5500 Hz that for the duct inside radius of a=0.077 m corresponded to the reduced frequency range 1.13
Źródło:
Acta Physica Polonica A; 2013, 123, 6; 1085-1089
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Mechanism of H-Induced Curie-Point Relaxation in Fe-Based Glassy Alloys
Autorzy:
Balla, S.
Kováč, J.
Novák, L.
Lovas, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813523.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.23.Cq
71.55.Jv
75.50.Kj
81.40.Rs
Opis:
In Fe based glasses not solely the stress-sensitive magnetic properties, but also the amorphous Curie temperature $(T_C^{am})$ can be altered by hydrogen absorption or due to the low temperature "heat treatments" in liquid $N_2$ (-196°C). The sign and magnitude of this $T_C^{am}$ shift is strongly compositional dependent, but it is also influenced by the thermal history of glasses (heat treatments). In this paper new experimental results are presented, which were obtained on FeCrB alloys, supporting the previous observations. An attempt of interpretation of the results is also made, which is based on the existence of the quenched-in phase reminiscences, being inherited from the liquid structure.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 55-59
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Design and the First Test Results of a Fast LTD Stage
Autorzy:
Chen, L.
Zhou, L.
Zou, W.
Ren, J.
Li, Y.
Wu, S.
Xie, W.
Feng, S.
Deng, J.
Powiązania:
https://bibliotekanauki.pl/articles/1807988.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.70.+p
52.75.Kq
84.60.Ve
Opis:
Linear transformer driver stages are designed to be used as a primary energy storage in high power pulsed generators. In this report, the design and test results of the linear transformer driver stage prototype that delivers ≈100 kA fast pulse with 133 ns FWHM into a ≈0.87 Ω resistive load are described. This stage consists of 20 (100 kV, 20 nF) storage capacitors that are arranged in 10 identical bricks located evenly around the axis of the stage. Each brick contains two capacitors, a multi-gap switch, and the output connector that transfers the energy to the resistive load. The outer diameter of the stage is ≈1.5 m, at a length of ≈20 cm. The stage is developed to demonstrate the possibility of the fast linear transformer driver technology to create high power pulsed generators.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1186-1188
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Model for Explosive-Driven Ultracompact Shock-Wave Ferromagnetic Generators
Autorzy:
Talantsev, E.
Shkuratov, S.
Baird, J.
Altgilbers, L.
Powiązania:
https://bibliotekanauki.pl/articles/1807897.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.50.+p
75.50.Ww
43.40.Jc
Opis:
An analytical model of the operation of recently invented ultracompact explosive-driven shock-wave ferromagnetic generators that utilize longitudinal (shock wave propagates along the magnetization vector) and transverse (shock wave propagates across the magnetization vector) shock wave demagnetization of $Nd_{2}Fe_{14}B$ hard ferromagnets, and an analytical technique for calculation of amplitudes of the current pulse produced by the generators were developed. The model utilizes the magnitude of the energy product, $(BH)_\text{max}$, and the magnetostatic energy of the hard ferromagnetic element of the ferromagnetic generator as parameters for determining ferromagnetic generator pulse generation, and it does not consider the magnitude of remnant magnetization, B_{r}, of the ferromagnetic material. The developed technique for calculation of the current pulse amplitude produced by the ferromagnetic generator provides comprehensive and accurate results. Amplitudes of calculated ferromagnetic generator output currents are in good agreement with experimentally obtained data.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1028-1030
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Field Induced Singlet Exciton Dissociation and Exciton-Exciton Annihilation in MEH-PPV Films Studied by Photocurrent Spectra
Autorzy:
Petrović, J.
Matavulj, P.
Pinto, L.
Živanović Šelmić, S.
Powiązania:
https://bibliotekanauki.pl/articles/1795611.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
72.40.+w
72.80.Le
Opis:
In this paper we investigate different processes which lead to charge carrier generation in ITO/PEDOT:PSS/MEH-PPV/Al photodetector. Primary photogenerated singlet excitons contribute the photocurrent directly through dissociation on the electrodes. Singlet exciton distribution in the active area of the photodetector is calculated on the base of continuity equation including exciton generation, diffusion, and recombination. Depending on the applied electric field and incident photon flux secondary charge carrier generation processes appear in the active MEH-PPV film. Two bulk charge generation mechanisms are considered. Nonlinear recombination of excitons through exciton-exciton annihilation leads to electron and hole polaron generation. Exciton states are also depopulated by exciton dissociation in the presence of high electric field. We assume hole polarons to be majority charge carriers. Polaron contribution to photocurrent is calculated by solving the continuity and drift-diffusion equations for these carriers. Photocurrent spectra are measured for different bias voltages and different incident photon flux intensities. A good agreement between experimental and simulated data confirms our theoretical approach.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 595-597
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Pulsed Magnetic Field Sensor Based on La-Ca-Mn-O Thin Polycrystalline Films
Autorzy:
Balevičius, S.
Žurauskienė, N.
Stankevič, V.
Keršulis, S.
Novickij, J.
Altgilbers, L. L.
Clarke, F.
Powiązania:
https://bibliotekanauki.pl/articles/2041727.pdf
Data publikacji:
2005-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
73.40.Gk
85.70.Ay
61.72.Mm
Opis:
It is demonstrated that polycrystalline La$\text{}_{0.33}$Ca$\text{}_{0.67}$MnO$\text{}_{3}$ thin film sensors can be used to measure pulsed strong magnetic fields with microsecond duration rise and decay times. The response characteristics of these sensors were investigated using 0.7-1.0 ms duration bell-shaped magnetic field pulses of 10-20 T amplitudes and by using special waveform magnetic field pulses with amplitudes of 40 T and decay times of 50μs. The response of these magnetic field sensors was compared with those of conventional loop sensors and Faraday rotation sensors using Bi$\text{}_{12}$SiO$\text{}_{20}$ single crystals as a known standard.
Źródło:
Acta Physica Polonica A; 2005, 107, 1; 207-210
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence and Lifetimes of Pr$\text{}^{3+}$ Excited States in KLa$\text{}_{1-x}$Pr$\text{}_{x}$(MoO$\text{}_{4}$)$\text{}_{2}$ and KLa$\text{}_{1-x}$Pr$\text{}_{x}$(WO$\text{}_{4}$)$\text{}_{2}$ Crystals
Autorzy:
Macalik, L.
Ryba-Romanowski, W.
Gołąb, S.
Hanuza, J.
Legendziewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1945617.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
78.20.Wc
Opis:
Single crystals of double molybdates and tungstates of the formula KLa$\text{}_{1-x}$Pr$\text{}_{x}$(MO$\text{}_{4}$)$\text{}_{2}$ (M = Mo, W) with a concentration of Pr$\text{}^{3+}$ ions ranging from x=0.1 to x=0.005 have been prepared. Their electronic absorption and emission spectra have been measured and discussed as well as related to their crystal structures. Both the multiphonon relaxation and cross relaxation contribute to the decay of the $\text{}^{3}$P$\text{}_{0}$ level of Pr$\text{}^{3+}$ in these two matrices.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 301-306
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic Studies on Distorted Structure Nanomolecules by Using Lie Algebraic Model
Autorzy:
Rao Karumuri, S.
Girija Sravani, K.
Vijayshekar, J.
Reddy, L.
Powiązania:
https://bibliotekanauki.pl/articles/1419693.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Fd
07.57.-c
02.20.Sv
78.30.Na
Opis:
We have applied Lie algebraic model to distorted structure molecules to determine the vibrational spectra of different stretching and bending vibrational modes. The the Lie algebraic model of the Hamiltonian expression is H = $E_0 + \sum_{i = 1}^{n} A_{i} C_{i} + \sum_{i < j}^{n} A_{ij} C_{ij} + \sum_{i < j}^{n} \lambda_{ij} M_{ij}$. By using the Lie algebraic method, the stretching vibrational energies of fullerene $(C_{80})$ are calculated in the one-dimensional [U(2)] framework. Using the model Hamiltonian so constructed, we have calculated the local mode vibrational energy levels of the fullerene $(C_{80})$ accurately.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 49-52
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integral Structure Perfection Diagnostics of Single Crystals Using Two Wavelengths of X-Ray Spectrum
Autorzy:
Datsenko, L.
Krasulya, S.
Machulin, V.
Auleytner, J.
Khrupa, V.
Powiązania:
https://bibliotekanauki.pl/articles/1964123.pdf
Data publikacji:
1997-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.-z
61.10.-i
Opis:
A new approach to determination of microdefect structure parameters by means of single crystal diffractometer is proposed. The approach is based on the measurements of the integral reflectivity of a sample for two selected X-ray wavelengths providing with the approximations of thin and thick crystal, respectively.
Źródło:
Acta Physica Polonica A; 1997, 91, 5; 935-938
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solvatochromic Effect in a Benzimidazole-Based Betaine: Determination of the Dipole Moments and Second-Order Hyperpolarizability
Autorzy:
Ziółek, L.
Palewska, K.
Lipiński, J.
Sworakowski, J.
Nes̆půrek, S.
Böhm, S.
Meister, E. C.
Powiązania:
https://bibliotekanauki.pl/articles/1933559.pdf
Data publikacji:
1995-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Jk
33.20.-t
42.65.An
78.40.-q
Opis:
Results of measurements of the solvent-dependent shift of the low-energy absorption band solvatochromic effect in a benzimidazole-based betaine are reported in the paper. Measurements of absorption spectra in several solvents of different polarities were performed. The solvatochromic shift of the low-lying absorption band was found to exceed 3000 cm$\text{}^{-1}$; the results obtained were then employed to calculate the ground- and excited-state dipole moment of the molecule. The spectroscopic measurements were supplemented by measurements of the ground-state dipole moment. A remarkable change in the charge distribution was found to occur upon the electronic excitation: both the experimental results and the calculations indicate that the ground-state dipole moment is close to 13 D, whereas in the excited state it amounts to ca. 3 D. The second-order hyperpolarizability of the molecule was calculated from the measurements; its off-resonance value amounts to ca. 20 × 10$\text{}^{-40}$ m$\text{}^{4}$/V (4.8 × 10$\text{}^{-30}$ esu), depending on the solvent used.
Źródło:
Acta Physica Polonica A; 1995, 88, 2; 283-293
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Soft Magnetic Properties and Temperature Stability of Co-Fe-Zr-B Metallic Glasses
Autorzy:
Bednarčík, J.
Kováč, J.
Roth, S.
Fűzer, J.
Kollár, P.
Varga, L.
Franz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1813531.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
Opis:
In the present work multicomponent Co-based alloys with nominal composition $Co_{72-x}Fe_xZr_8B_{20}$ (x=10, 15, and 20 at. %) were synthesized by single-roller melt-spinning. The measurement of coercivity, $H_c$, reveals the soft magnetic behavior of investigated alloys. The value of $H_c$ increases from 23 A/m for alloy with x=10 at. % up to 32 A/m for alloy with x=20 at. %. Further it was found that crystallization temperature of as-quenched alloys slightly varies with iron content and lays between 605 and 625°C. From the temperature dependence of magnetization it follows that partial substitution of cobalt by iron has positive influence on the Curie temperature of amorphous phase, $_cT^{am}$, which increases from 300°C up to 462°C for alloy with x=10 at. % and x=2 0 at. %, respectively.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 83-86
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 92

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