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Wyświetlanie 1-15 z 130
Tytuł:
Robust Algorithm for Heart Rate (HR) Detection and Heart Rate Variability (HRV) Estimation
Autorzy:
Piotrowski, Z.
Różanowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1537546.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.Ng
87.19.Le
84.37.+q
87.57.C-
Opis:
We present algorithm for Heart Rate detection based on Short-Term Autocorrelation Center Clipping method. This algorithm is dedicated for biological signal detection, electrocardiogram, in noisy environment with lot of artifacts. Using this algorithm is also possible detect the R pointers in the PQRST complex of the ECG signal. In this paper the new implementation of the heart rate variability estimation is also presented. HRV module is based on parametric and non-parametric methods of the power spectral density computation.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 131-135
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Domain Pattern Evolution in Polarization Reversal of Telluric Acid Ammonium Phosphate Crystals
Autorzy:
Matyjasek, K.
Czapla, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2014072.pdf
Data publikacji:
2000-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Dj
Opis:
The domain nucleation and growth during switching process in telluric acid ammonium phosphate crystals has been investigated by nematic liquid crystal decoration technique. The domain configuration arising during polarization reversal has been discussed, considering that the type of nucleation is the controlling factor in the propagation of the domain walls.
Źródło:
Acta Physica Polonica A; 2000, 98, 1-2; 103-109
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micropropagation of walnut (Juglans regia L.)
Autorzy:
Kepenek, K.
Kolağasi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1065655.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.17.Uv
87.80.Rb
Opis:
The objective of this work was to establish regeneration protocol for walnut (Juglans regia L.) by multiplication of shoots from axillary buds. Different concentrations of TDZ (0.0, 1.0, 2.5, 5.0 mg/l), IBA (0.0, 1.0, 2.5, 5.0 mg/l) or IBA together with TDZ were investigated to optimize regeneration for the multiplication in the NGE (Sanchez) culture medium. Multiplication rate increased with increased concentration of TDZ or IBA together with TDZ. The highest mean multiplication rate was observed in the fourth subculture with 2.5 mg/l TDZ + 2.5 mg/l IBA reaching 5.33 shoots per explant. The shoots supplemented with 5 mg/l IBA (62.71%) had higher number of rooted shoots than those supplemented with 2.5 mg/l IBA (45.66%). With 73.24% of rooting, the shoots rooted on medium containing 2.5 mg/l IBA after etiolation application had higher number of rooted shoots than those supplemented with 5 mg/l IBA with 64.69% of rooting after etiolation application. The highest mean survival rate of the shoots was observed in 2.5 mg/l TDZ + 2.5 mg/l IBA reaching 35.27%. Results showed that walnut in vitro micropropagation is feasible and the best growth percentage was obtained in 5.0 mg/l TDZ, and 2.5 mg/l TDZ with 2.5 mg/l IBA.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 150-156
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extended X-Ray Absorption Fine Structure Studies of Co Doped ZnS and ZnSe Alloys
Autorzy:
Ławniczak-Jabłońska, K.
Gołacki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1931712.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Lx
78.70.Dm
87.64.Fb
Opis:
X-ray absorption experiments were performed at the Kedge of Co and Zn in Zn$\text{}_{1-x}$Co$\text{}_{x}$S and Zn$\text{}_{1-n}$Co$\text{}_{x}$Se compounds with x = 0.25, 0.16, 0.10, 0.05, 0.00 in the sulphides samples and x = 0.07, 0.02, 0.00 in the selenide ones. Analysis of the extended X-ray absorption fine structure oscillations using phase and amplitudes either from McKale code or from standard samples, gave the distance, number of atoms and the Debye-Waller factors for nearest neighbours. We found that the cation-anion distances Zn-S(Se) or Co-S(Se) are systematically shorter in ZnS than in ZnSe matrix, the Zn-anion distance is always larger than the Co-anion one without any significant Co content dependence. This allowed us to estimate the covalent radius of Co in the studied matrices to be 0.025 Å smaller than the Zn covalent radius and stated that covalent radius of Co is independent of the type of surrounding atoms. In addition the Debye-Waller factors indicated a better ordering in ternary compounds than in the binary standard ones in agreement with rocking curve measurements.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 727-735
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Imaging Plates in Synchrotron and Conventional X-Ray Crystallographic Data Collection
Autorzy:
Dauter, Z.
Wilson, K. S.
Powiązania:
https://bibliotekanauki.pl/articles/1931644.pdf
Data publikacji:
1994-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.+n
29.40.Gx
Opis:
Application of two-dimensional detectors based on imaging plates for X-ray crystallographic data collection is discussed. The properties of imaging plates are somewhat different from those of other available X-ray detectors, like film, multiwire ionization chambers, TV tubes or scintillation counters. Imaging plate scanners are well suited for laboratory X-ray sources as well as for strong synchrotron radiation. Originally developed for macromolecular crystallography, they can be used successfully to collect data on crystals of small or medium size molecules.
Źródło:
Acta Physica Polonica A; 1994, 86, 4; 477-486
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Comparison of Hardness and Coercivity Evolution in Various Fe-B Based Glasses (Including FINEMET Precursor) during Relaxation and Crystallization
Autorzy:
Weltsch, Z.
Klam, K.
Lovas, A.
Powiązania:
https://bibliotekanauki.pl/articles/1032210.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
75.50.Kj
75.50.Vv
75.60.Ej
Opis:
Inverse relation exists between the hardness and coercivity change within the whole period of structural relaxation in the investigated Fe-B(Si) based metallic glasses. This relation is independent of B-content and composition. This inverse relation is no more valid in binary Fe-B glasses after the onset of crystallization, when both the hardness and coercivity exhibit rapid increase. In contrast, the inverse relation was in FINEMET type glasses between these properties preserved in the first step of crystallization during the whole period of nanocrystallization.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 669-671
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Jahn-Teller Effect on Magnetic Properties of Fe-Based Semimagnetic Semiconductors
Autorzy:
Lebeckl, K.
Twardowski, A.
Liro, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1887005.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.90.+w
71.70.Ej
71.70.Ch
75.50.Pρ
Opis:
We report results of calculations of magnetic properties (specific heat, magnetization) of Fe-based Semimagnetic Semiconductors including Jahn-Teller coupling between Fe electronic states and phonons.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 373-375
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Large-Scale Nanosecond Simulations of the Dynamics of the Xe + H$\text{}_{2}$O System
Autorzy:
Kholmurodov, K.
Seifert, Z.
Rączkiewicz, K.
Nitka, J.
Powiązania:
https://bibliotekanauki.pl/articles/2047167.pdf
Data publikacji:
2006-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.Qg
61.20.-p
61.50.Ah
81.10.Aj
91.60.Gf
Opis:
Large-scale molecular dynamics simulations of the high-pressure transformations of the xenon/water system were performed involving special purpose molecular dynamics machines. We investigated several systems of different sizes and geometry at the suitable simulational conditions (density, temperature, etc.), which are similar to the experiments conducted on the xenon hydrates. A binary mixture (ice water + Xe) undergoes at high pressure a long evolution and the Xe-guest atoms, enclosed inside the water molecules, were observed and analyzed. Even for the thin slabs, starting with the capture of the guest atoms by the water molecules, the water clusters around the xenon atoms are formed. The results show that such a hydrate-like formation preserves its structural stability over a long period of the simulation time of order of nanosecond. The molecular dynamics simulations were performed on a basis of the MDGRAPE-2 modifications of the DL$\text{}_{P}$OLY general purposes package, with the efficient treatment of the Ewald real and reciprocal-space components of the Coulombic and Van der Waals forces. The MDGRAPE-2 accelerates the calculations of the Coulomb and Van der Waals forces, without applying a spherical cut of a fixed distance. 31.15.Qg, 61.20.-p, 61.50.Ah, 81.10.Aj, 91.60.Gf
Źródło:
Acta Physica Polonica A; 2006, 110, 6; 759-767
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absorption Enhancement in Si Solar Cells by Incorporation of Metallic Nanoparticles: Improved COMSOL Numerical Study Including Quantum Corrections
Autorzy:
Kluczyk, K.
Krzemińska, Z.
Jacak, W.
Powiązania:
https://bibliotekanauki.pl/articles/1033865.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
solar cells
solar energy harvesting
surface plasmons
metallic nanoparticles
Opis:
One of the crucial parameters affecting the solar cell efficiency is the absorption rate versus solar spectrum. Metallic nanoparticles deposited on the cell surface can mediate this process. Main mechanisms of absorption enhancement due to metallic nanoparticle plasmons were proposed: (1) the scattering of incident solar light causing increase of the optical path length inside active layer and local enhancement of the electric field; (2) near field coupling between plasmon and semiconductor and the direct generation of electron-hole pairs in the semiconductor. The field concentration effect can be described by classical electrodynamic theory, the coupling between metallic nanoparticle plasmons and band electrons in semiconductor substrate must be captured upon quantum mechanics. In this paper we took the challenge to develop fast and reliable method for calculation of device optical properties by application of COMSOL system appropriately configured to take into account these quantum effects, via the quantum modification of the dielectric function of semiconductor substrate and metallic components. The presented results indicate that the efficiency of energy transfer due to near field coupling of metallic nanoparticle plasmons with semiconductor substrate is much more effective than the absorption increase due to metallic nanoparticle plasmons scattering only.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 393-397
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Interpretation of the Radarograms on the Basis of Experimental Data
Autorzy:
Zhartybayeva, M.
Oralbekova, Z.
Iskakov, K.
Powiązania:
https://bibliotekanauki.pl/articles/1402517.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.43.fj
73.43.Fj
01.50.hv
Opis:
An algorithm for solving the inverse problem of subsurface radiolocation using data from ground penetrating radar is presented in this paper. Experimental research was carried out using the geophysical device "Loza B" in field conditions; a part of airfield runway, located on the territory of Almaty region (Kazakhstan), was investigated. The conclusion concerning the reasons of occurrence of defects on the surface of the runway is given.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-467-B-468
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Photonic Crystal All-Optical Diode Efficiency with a Subwavelength Layer
Autorzy:
Jamshidi-Ghaleh, K.
Safari, Z.
Tanavar, R.
Powiązania:
https://bibliotekanauki.pl/articles/1399693.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
Opis:
In this paper, the effect of a subwavelength thin layer on all-optical diode action in a one-dimensional photonic crystal is investigated. The photonic multilayer structure is considered as $\text{(BA)}^6$ $\text{(AB)}^6$ $\text{C(AABB)}^6$, where layers A and B are nonlinear and linear materials respectively, and C is a thin layer with positive or negative-index material. The results are shown that by introducing a thin layer with different optical properties the all-optical diode efficiency is controllable. In our numerical results, the transmission contrast of the structure, without the thin layer is obtained as 0.63, with a positive index material layer nearly zero and with a negative index material thin layer about 0.75.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 212-214
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Anisotropy and Magnetostriction of Atom Pairs
Autorzy:
Kułakowski, K.
Maksymowicz, A. Z.
Magdoń, M.
Powiązania:
https://bibliotekanauki.pl/articles/1931338.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
Opis:
We calculated one-electron hopping contribution to two-ion magnetic anisotropy and shape magnetostriction in amorphous 3d-alloys. Calculations were performed in the narrow band limit and include spin-orbit coupling, the Zeeman orbital and spin magnetic moments terms with possible partial effective quenching of the orbital magnetic moments in metals. The parameters for numerical calculations are expected to correspond to pairs of Fe atoms with the spin-orbit coupling A= 0.03 eV and hopping integrals of about 3 eV. The magnetic anisotropy K changes its sign at some value Δ$\text{}_{K}$ of effective magnetic splitting Δ proportional to the magnetization. Then the local easy axis which is parallel to the direction of the pair for small Δ switches to perpendicular easy plane case. K is nearly linear vs. Δ for small Δ and varies roughly as Δ$\text{}^{3}$ for large splitting. The dependence of magnetostriction B on Δ is similar to that of magnetic anisotropy K(Δ). For small values of Δ the coefficient B is also linear. Magnetostriction changes its sign at Δ$\text{}_{B}$ and becomes positive for Δ greater than Δ$\text{}_{K}$.
Źródło:
Acta Physica Polonica A; 1994, 85, 5; 869-873
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Mechanochemical Treatment on Magnetic Properties of Nanodimensional Magnetite-Type Materials
Autorzy:
Cherkezova-Zheleva, Z.
Zaharieva, K.
Buchkov, K.
Blagoev, B.
Mitov, I.
Powiązania:
https://bibliotekanauki.pl/articles/1382568.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.-d
75.75.-c
82.80.Ej
Opis:
The presented study compares magnetic properties of Ni-doped magnetites $Ni_{0.5}^{2+}Fe_{0.5}^{2+}Fe_{2}^{3+}O_{4}$ to magnetite $(Fe_3O_4)$ sample. Physicochemical properties of materials were registered by means of X-ray powder diffraction, Mössbauer spectroscopy, saturation magnetization and physical properties measurement systems. It was obtained that used preparation procedures lead to synthesis of single phase spinel materials with close nanodimensional size about 8-12 nm. Mechanochemically synthesized sample shows better magnetic properties as lower blocking temperature of superparamagnetic state and minimal coercivity in comparison to other studied materials.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 912-915
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superplastic Behaviour of an Extruded AZ91 Alloy
Autorzy:
Trojanová, Z.
Turba, K.
Száraz, Z.
Ryspaev, T.
Palček, P.
Chalupová, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419006.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
62.20.fq
Opis:
Plastic deformation of extruded AZ91 magnesium alloy was investigated at various strain rates and in a temperature range of 360-420°C. Samples exhibiting superplastic behaviour were prepared with different thermo-mechanical treatments. Microstructure of samples was observed by light and scanning electron microscopy. The strain rate sensitivity parameter m has been estimated by the abrupt strain rate change method. Possible physical mechanisms of the superplastic flow are discussed.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 597-600
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Low Temperature Study of $Ln[Fe(CN)_6] \cdot xH_2O$ Rare-Earth Ferricyanides, Ln=Pr,La
Autorzy:
Maťaš, S.
Mitróová, Z.
Kiefer, K.
Ryll, H.
Prokeš, K.
Powiązania:
https://bibliotekanauki.pl/articles/1534892.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.20.Cz
25.40.Dn
75.30.-m
Opis:
We present magnetic and structural properties of $Ln[Fe(CN)_6] \cdot xH_2O$, Ln = Pr, La single crystals investigated by means of elastic neutron diffraction and heat capacity down to 0.03 K and susceptibility and magnetization measurements. The susceptibility data were taken on the commercial SQUID magnetometer (Quantum Design) in the range between 2 K and 30 K and in fields up to 5 T. Our low temperature neutron diffraction data taken in a zero field rules out some of antiferromagnetic models suggested in the literature.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 962-964
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 130

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