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    Wyświetlanie 1-28 z 28
    Tytuł:
    Implementation of Ffowcs Williams and Hawkings aeroacoustic analogy in OpenFOAM
    Autorzy:
    Jarosz, K.
    Czajka, I.
    Gołaś, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/128212.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    aeroacoustics
    CFD
    FH-W analogy
    CAA
    OpenFOAM
    FVM
    aeroakustyka
    analogia FH-W
    Opis:
    This paper presents the development of post-processing aeroacoustics utility for OpenFOAM, based on Ffowcs Williams-Hawkings aeroacoustic analogy. Although the FH-W analogy is well known for almost 50 years, there is a lack of open-source software which is using it, hence decision to perform this implementation. This is the veryfirst version of utility, so only one formulation of FH-W were implemented. Presented application allows to compute far-field acoustic pressure from near field CFD solution. Validation is based on NASA Tandem Cylinder Case. Comparison of the results from simulation show fairly good agreement with experimental data.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 161-168
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Paramagnetic Resonance Study of the [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$]$\text{}_{5}$Cd$\text{}_{3}$Cl$\text{}_{11}$ Monocrystal Doped with Cu$\text{}^{2+}$ ion
    Autorzy:
    Ostrowski, A.
    Bednarski, W.
    Waplak, S.
    Czapla, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030763.pdf
    Data publikacji:
    2002-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.-v
    05.70.Fh
    Opis:
    The paper reports the electron paramagnetic resonance investigation of Cu$\text{}^{2+}$ doped [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$]$\text{}_{5}$Cd$\text{}_{3}$Cl$\text{}_{11}$ (DMACC) monocrystal. DMACC:Cu$\text{}^{2+}$ was studied in the temperature range (6÷293) K. We did not observe any anomalies of spin-Hamiltonian parameters of Cu$\text{}^{2+}$ ion corresponding to the temperature anomalies observed in dielectric studies. The electron paramagnetic resonance anomaly recorded at about 40 K results from the subtle changes in bonds angles and Cu-Cl distances and suggests the smooth second order transition.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 6; 893-899
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction and transport of humic acid using supported liquid-membrane containing trioctyl phosphine oxide (TOPO) as the carrier
    Autorzy:
    Taoualit, N.
    Azzazi, F.
    Benkadi, N.
    Hadj-Boussaad, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1061470.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Lg
    88.40.fh
    Opis:
    Effluents or liquids of percolation from the discharges (leachates) are charged bacteriologically and especially chemically of mineral substances (mineral ions and heavy metals) and organic (volatile fatty acids, humic substances), which can contaminate soil, surface waters and ground waters. The humic substances, called also refractories, are not easily biodegradable and require concentrating them and/or adsorbing them by implementation of expensive processes. Scientists are looking for alternatives to eliminate or recover these substances. The present study investigates the elimination of humic acid from waste water using supported liquid membrane containing trioctyl phosphine oxide (TOPO) in toluene, as extractant. The supported liquid membrane is composed of a flat sheet of cross-linked polydimethylsiloxane (PDMS). In this study we have: (i) optimized the conditions for humic acid species transfer from feed aqueous phase to stripping phase across PDMS/TOPO/toluene supported liquid membrane; (ii) characterized the membrane by using FTIR technique and by determining the flux J, permeability P and diffusion coefficient of the complexed species D. Speciation of the humic acid species in the membrane organic carrier (extractant) phase has also been carried out using theoretically derived equations to elucidate the stoichiometry and mechanism of transport of humic acid across the PDMS/TOPO/toluene supported liquid membrane. Optimum conditions of transport for humic acid have been found to be: pH=3, [NaOH]=0.4 M, E_{extraction}=94.67%, E_{diffusion}=32.5%, J=1.34 × 10¯⁴ mg cm¯² s¯¹, D=1.16 × 10¯² cm² s¯¹ and P=2.64 cm s¯¹. Kinetic parameters calculated from the experimental data have been determined. Thermodynamic functions of the several species transfer from the feed solution to the stripping one through the supported liquid membrane, such us enthalpy, entropy and Gibbs free energies, were determined. Positive values of Δ H and negative values of Δ G indicate respectively the endothermic and the spontaneous nature of the humic acid extraction in aqueous solution.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 115-121
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature and Pressure Dependence of the Linewidth for an Internal Mode in the Solid Phases of Benzene
    Autorzy:
    Yurtseven, H.
    Şenol, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399290.pdf
    Data publikacji:
    2013-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.60.-i
    05.70.Fh
    Opis:
    The pressure dependence of the Raman linewidths for the $ν_1$ breathing mode is analyzed using the experimental data from the literature for the solid phases (I, II, III and III') in benzene. Increase (I, III and III') and decrease (II) in the Raman linewidths are described by a power-law analysis with the critical exponent β. The β values we find, which characterize the phase transition are in favour of the first order among those phases considered in benzene. The temperature and pressure dependence of the frequencies and linewidths of various Raman modes can be analyzed using a power-law formula, as studied here for the solid phases (I, II, III and III') in benzene when the experimental data are available in the literature.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 4; 698-701
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aperiodicity in Equilibrium Systems: Between Order and Disorder
    Autorzy:
    van Enter, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1203443.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.70.Fh
    61.44.Br
    02.50.Ey
    Opis:
    Spatial aperiodicity occurs in various models and materials. Although today the most well-known examples occur in the area of quasicrystals, other applications might also be of interest. Here we discuss some issues related to the notion and occurrence of aperiodic order in equilibrium statistical mechanics. In particular, we consider some spectral characterisations, and shortly review what is known about the occurrence of aperiodic order in lattice models at zero and nonzero temperatures. At the end some more speculative connections to the theory of (spin-)glasses are indicated.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 621-624
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Capacitance of Cobalt Oxide Nanotubes on Nickel Foam
    Autorzy:
    Yagmur, V.
    Atalay, F.
    Kaya, H.
    Avcu, D.
    Aydogmus, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399695.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.De
    82.47.Uv
    88.80.fh
    Opis:
    In this study, densely packed $Co_3O_4$ nanotubes for supercapacitors have been obtained by means of chemically depositing cobalt hydroxide within a porous anodic aluminum oxide and then annealed at 360°C. The morphological properties obtained $Co_3O_4$ nanotubes were studied by scanning electron microscopy, the chemical composition was determined by examination of the energy dispersive X-ray spectra. Supercapacitor characteristics such as charging/discharging and impedance (Z) characteristics were also examined.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 215-217
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo Studies of the p-Spin Models οn Scale-Free Hypernetworks
    Autorzy:
    Krawiecki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400177.pdf
    Data publikacji:
    2013-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.75.-k
    89.75.Hc
    05.70.Fh
    Opis:
    Results of Monte Carlo simulations of p-spin models on scale-free hypernetworks are presented. The hypernetworks are obtained using the preferential attachment algorithm, the spins are located in the nodes and the hyperedges connecting p nodes correspond to non-zero ferromagnetic interactions involving p spins. Such models show high degeneracy of the ground state: apart from the ferromagnetic state, depending on the parameters of the preferential attachment algorithm leading to different topologies of the obtained hypernetworks, there are several or even infinitely many disordered (glassy) states with the same energy. For various network topologies quantities such as the specific heat or magnetic susceptibility show maxima as functions of the temperature, which suggests the occurrence of the glassy or ferromagnetic phase transition. The models under study may serve as a starting point for modelling various forms of cooperation in social and economic sciences involving many-body rather than two-body interactions.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 3; 564-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Fabrication of NiO Microtubes Using Bacillus subtilis/Bacteria
    Autorzy:
    Atalay, F.
    Asma, D.
    Aydogmus, E.
    Turanci, H.
    Kaya, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195249.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    82.47.Uv
    88.80.fh
    Opis:
    The nickel oxide microtubes with high surface-to-volume ratio have been achieved using the Bacillus subtilis bacteria. Surface properties of the metal-oxide nanostructured materials were investigated by electron microscopy. The surface area of that was also studied by the Brunauer-Emmett-Teller analysis method. The materials were used at the construction of supercapacitor as an electrode active material.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 235-237
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Ultrasonic Investigations of Phase Transitions in Ferroelectric RbHSeO$\text{}_{4}$ Single Crystal
    Autorzy:
    Sveleba, S. A.
    Bublik, M. I.
    Polovinko, I. I.
    Kityk, A. V.
    Sopronuk, V. P.
    Czapla, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920942.pdf
    Data publikacji:
    1992-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    77.20.+y
    05.70.Fh
    Opis:
    Birefringence and ultrasonic measurements were done for ferroelectric RbHSeO4 crystal. Influences of both stresses (σ$\text{}_{i}$) and pressure on the properties and phase transition were studied as well. The observed dependence of δ(Δn$\text{}_{b}$) = f(σ$\text{}_{5}$) shows hysteresis loop characteristic of ferroelectric phase whereas the dependence of δ(Δn$\text{}_{c}$) = f(σ$\text{}_{6}$) shows hysteresis loop characteristic of ferroelastic phase. Birefringence measurements prove the phase transition to ferroelectric phase at 373 K. Additionally, the phase transition was found at 398 K. The new phase may be regarded as an incommensurate one. On the grounds of the stresses influence the phase diagram is constructed in coordinates T, σ$\text{}_{5}$. The linear decrease in T$\text{}_{c}$ with increase in pressure is observed in ultrasonic studies and it is similar to the results obtained in DSC measurements.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 3; 481-486
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Phase Transition in the One-Dimensional XZ Model
    Autorzy:
    Brzezicki, W.
    Oleś, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810415.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Jm
    03.67.-a
    05.70.Fh
    Opis:
    We introduce a one-dimensional XZ model with alternating $σ_i^zσ_{i+1}^z$ and $σ_i^x σ_{i+1}^x$ interactions on even/odd bonds, interpolating between the Ising model and the quantum compass model. We present two ways of its exact solution by: (i) mapping to the quantum Ising models, and (ii) using fermions with spin 1/2. In certain cases the nearest neighbor pseudospin correlations change discontinuously at the quantum phase transition, where one finds highly degenerate ground state of the 1D compass model.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 162-164
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Formation of Free Standing NiO Nanostructures on Nickel Foam for Supercapacitors
    Autorzy:
    Atalay, F.
    Aydogmus, E.
    Yigit, H.
    Avcu, D.
    Kaya, H.
    Atalay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1194862.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    82.47.Uv
    88.80.fh
    Opis:
    In this study, free standing NiO nanostructures for supercapacitors were obtained by means of chemically depositing of nickel oxide on Ni foam and then they were annealed at various temperatures. The morphological properties of densely covered Ni foams were studied by scanning electron microscopy. Supercapacitor characteristics, such as charging/discharging and impedance characteristics, were also examined.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 224-226
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transitions in (CH$\text{}_{3}$)$\text{}_{2}$ CHNH$\text{}_{3}$CdCl$\text{}_{3}$ Crystal
    Autorzy:
    Krzewska, U.
    Jakubas, R.
    Dacko, S.
    Czapla, Z.
    Waśkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920518.pdf
    Data publikacji:
    1992-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    05.70.Fh
    77.20.+y
    Opis:
    The crystal of (CH$\text{}_{3}$)$\text{}_{2}$CHNH$\text{}_{3}$CdCl$\text{}_{3}$ was grown and its physical properties were investigated. On the ground of DSC, dylatometric and dielectric investigations the phase transition at 390 K on heating process was revealed. On cooling two phase transitions at 382 K and 352 K were found. Polarized microscope observations show appearance of ferroelastic domain structure and cracks at 390 K on heating. On cooling the observed domain structure vanishes at 352 K.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 3; 379-384
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Critical Behaviour and Phase Diagram of Ising-like Metamagnet in a Transverse Field
    Autorzy:
    Lukierska-Walasek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930584.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    81.30.Dz
    05.70.Fh
    Opis:
    The quantum Ising-like metamagnet in a field Γ perpendicular to the easy direction in the mean field approximation is investigated. The conditions for the existence of critical and tricritical points have been analyzed. The result is illustrated by an appropriate plot in three-dimensional space of the following parameters: the temperature, Γ, and field parallel to the easy direction.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 381-384
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Bistability Induced by Additive Colored Noise in the Exciton-Biexciton System
    Autorzy:
    Gonţia, I. I.
    Rotaru, A. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933412.pdf
    Data publikacji:
    1995-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.40.+j
    05.70.Fh
    42.65.Pc
    Opis:
    This paper predicts optical bimodality induced by external additive noise with a finite bandwidth, in the exciton-biexciton system.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 6; 911-917
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metastable Magnetic Structures in the Blume-Capel Model
    Autorzy:
    Kułakowski, K.
    Antoniuk, M.
    Del Moral, A.
    Gawroński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013716.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.70.Fh
    75.10.Hk
    75.30.Kz
    Opis:
    We discuss a first-order phase transition from non-magnetic to magnetic phase at T=0. New results are presented on a spontaneously formed magnetic phase and its energy in the C15 atomic structure, in the presence of the antiferromagnetic interaction. A dynamic phase diagram is constructed for the phase transition. The results are discussed in the context of the pressure-driven phase transition, which was observed experimentally in YMn$\text{}_{2}$.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 893-896
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transitions in a Coupled Electron and Spin Model on the Shastry-Sutherland Lattice
    Autorzy:
    Farkašovský, P.
    Čenčariková, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366499.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.-b
    75.40.Mg
    05.70.Fh
    Opis:
    The thermodynamics of a simple electron-spin model proposed recently for a description of magnetization processes in rare-earth tetraborides is studied numerically by the canonical Monte Carlo method in two-dimensions. The model is based on the coexistence of two subsystems, and namely, the spin subsystem described by the Ising model and the electronic subsystem described by the free-electron model on the Shastry-Sutherland lattice (SSL). Moreover, both subsystems are coupled by the anisotropic spin-dependent interaction of the Ising type. At T=0 the system exhibits the magnetization plateau (MP) at m/$m_s$=1/2, 1/3, 1/5, 1/7, 1/9 and 1/11 of the saturated spin magnetization $m_s$. For the largest phases corresponding to m/$m_s$=0, 1/3 and 1/2 we have examined the nature of the phase transitions from the low-temperature ordered phase (LTOP) to the high-temperature disordered phase (HTDP). It is shown that all phases persist also at finite temperatures (up to the critical temperature $T_c$) and that the phase transition at the critical point is of the second order for the m/$m_s$=0 phase and of the first order for the m/$m_s$=1/3 and 1/2 phases.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 44-45
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Order in Quantum Compass and Orbital e_{g} Models
    Autorzy:
    Czarnik, P.
    Dziarmaga, J.
    Oleś, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029762.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Jm
    05.10.Cc
    05.70.Fh
    75.25.Dk
    Opis:
    We investigate thermodynamic phase transitions in the compass model and in e_{g} orbital model on an infinite square lattice by variational tensor network renormalization (VTNR) in imaginary time. The onset of nematic order in the quantum compass model is estimated at _{c}/J=0.0606(4). For the e_{g} orbital model one finds: (i) a very accurate estimate of _{c}/J=0.3566± 0.0001 and (ii) the critical exponents in the Ising universality class. Remarkably large difference in frustration results in so distinct values of _{c}, while entanglement influences the quality of _{c} estimation.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 359-361
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rise and Fall of Reentrant Phase Transitions in a Coupled Spin-Electron Model on a Doubly Decorated Honeycomb Lattice
    Autorzy:
    Čenčariková, H.
    Strečka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032648.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.50.+q
    05.70.Fh
    71.27.+a
    75.30.Kz
    Opis:
    Phase diagrams and spontaneous magnetization are rigorously calculated for a coupled spin-electron model on a doubly decorated honeycomb lattice, which accounts for a quantum-mechanical hopping of the mobile electrons on decorating sites, the nearest-neighbor Ising coupling between mobile electrons and localized spins, as well as the further-neighbor Ising coupling between the localized spins placed on nodal sites. The spontaneously ordered ferromagnetic phase, spontaneously ordered antiferromagnetic phase and disordered paramagnetic phase emerge in a phase diagram depending on an electron filling of the decorating sites, a relative size of the hopping term and both considered coupling constants. It is evidenced that a nature and size of the further-neighbor Ising coupling between the localized spins basically influences rise and fall of reentrant transitions close to a phase boundary between the paramagnetic phase and both spontaneously ordered phases.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1021-1023
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Models of Pedestrian Evacuation based on Cellular Automata
    Autorzy:
    Mrowinski, M.
    Gradowski, T.
    Kosinski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1409052.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.40.-a
    45.70.Vn
    05.50.+q
    05.70.Fh
    Opis:
    We study two models of pedestrian evacuation based on cellular automata and intelligent agents. We use the static floor field approach and augment it with additional transition rules (random movement and preservation of personal space) in order to model various aspects of human behaviour. Through numerical simulations we investigate pedestrian evacuation from rooms with various geometries (e.g. empty room, classroom). Using heatmaps (density diagrams of pedestrians), average evacuation times, velocity and other parameters we study the effectiveness of evacuation and potential dangers pedestrians may encounter.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2B; B-95-B-100
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Production Considerations on a Button Type Beam Position Monitor for Use of TAC-TARLA Facility
    Autorzy:
    Tural Gundogan, M.
    Kaya, C.
    Yavas, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032565.pdf
    Data publikacji:
    2017-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.60.Cr
    29.27.-a
    29.27.Fh
    07.10.-h
    07.57.-c
    Opis:
    Turkish Accelerator and Radiation Laboratory in Ankara (TARLA) facility is a superconducting linac-based infrared free-electron laser light source in the frame of Turkish Accelerator Center (TAC). Construction of the facility premises was completed in 2009, with a continued progress of hardware and infrastructure installation until today. In this respect, a button type beam position monitor (BPM) is designed, produced and tested for use of TARLA facility. Antenna simulations and mechanical design studies based on TARLA electron beam parameters are carried out by the software computer simulation technology. In this paper, its design and production highlights are discussed in detail, and the original results are summarized.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 4; 1333-1339
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asymmetry Coefficients as Indicators of Chaos
    Autorzy:
    Wąż, P.
    Bielińska-Wąż, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1584980.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.70.Rr
    95.10.Fh
    05.45.-a
    05.45.Gg
    05.45.Tp
    Opis:
    The aim of this paper is to present a new simple indicator of chaos derived from the dynamics of the motion. For this purpose statistical methods are used. A function describing the motion of the analyzed system (in the example under consideration, the time dependence of the angle of a damped driven pendulum, ω(t)) is recorded in time intervals t∊〈 $T_{s}$, $T_{f_{k}}$〉, k = 1, 2,...K, with $T_{f_{k}}$ > $T_{f_{k-1}}$. Each of the recorded functions is considered as a statistical distribution. The asymmetry coefficients of the set of distributions form a series and their behavior in periodic and chaotic regions is compared. It is shown that the behavior of this series in the chaotic and in the periodic regimes is entirely different. The changes of the asymmetry coefficients for the periodic cases are very regular and for the chaotic ones - random. In periodic cases, the coefficients converge to zero when the length of the distribution increases.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 6; 987-991
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Pressure Treatment up to 25~GPa of Czochralski Grown Si Samples Containing Different Admixtures and Defects
    Autorzy:
    Shchennikov, V.
    Shchennikov, Vs.
    Korobeynikov, I.
    Morozova, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399450.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.uf
    81.40.Vw
    72.20.Pa
    62.50.-p
    05.70.Fh
    Opis:
    The thermoelectric properties of a set of single crystalline Si wafers with different oxygen concentration grown by the Czochralski technique have been studied at ultrahigh pressures up to 25 GPa. The dependence of semiconductor-metal transition pressure at Czochralski grown Si on the concentration $c_{O}$ of the interstitial oxygen was found to present a convex curve with the maximum near $c_{O} \approx 9 \times 10^{17} cm^{-3}$. The high pressure thermoelectric power method seems to be suitable for characterization of impurity-defect structure of Si wafers. For $Si_{1 - x}Ge_{x}$ crystals (1% < x < 3%) the strong changes of both the value and the sign of thermoelectric power have been observed at pressures much less than ones of Si-I → Si-II transition. From nanoindentation data the phase transition Si-I → Si-II, corresponding to semiconductor-metal electronic transformation has been detected at the loading up to ≈ 10 mN. These findings suggest a way for creation of integrated circuits, in which zones with different types of conductivity and hence different p-n, p-n-p etc. structures may be "written" by applied stress at nanoscale level, and the control on the value of the above stresses now is possible by the proposed nanoindentation technique.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 244-249
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asymmetry Coefficients as Indicators of Chaos: Hyperchaotic Qi System
    Autorzy:
    Wąż, P.
    Bielińska-Wąż, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400122.pdf
    Data publikacji:
    2013-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.70.Rr
    95.10.Fh
    05.45.-a
    05.45.Gg
    05.45.Tp
    Opis:
    Statistical properties of the hyperchaotic Qi system are studied. The theory, recently formulated and applied for the damped driven pendulum, is used in this investigation. Asymmetry coefficients, related to the statistical moments of distributions composed from the time-series, are shown to behave in a different way for periodic, chaotic and hyperchaotic solutions and are proposed as indicators of chaos and hyperchaos.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 4; 647-650
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Horizontal lift of symmetric connections to the bundle of volume forms \(\mathcal{V}\)
    Autorzy:
    Gasior, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/747213.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    Horizontal lift
    \(\pi\)-conjugate connection
    Killing field
    infinitesimal transformation
    \(F(3, 1)\)-structure
    FK, FAK, FNK, FQK, FH-structure
    Opis:
    In this paper we present the horizontal lift of a symmetric affine connection with respect to another affine connection to the bundle of volume forms \(\mathcal{V}\) and give formulas for its curvature tensor, Ricci tensor and the scalar curvature. Next, we give some properties of the horizontally lifted vector fields and certain infinitesimal transformations. At the end, we consider some substructures of a \(F(3, 1)\)-structure on \(\mathcal{V}\).
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica; 2010, 54, 1
    0365-1029
    2083-7402
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of a Mixed Hadronic-QGP System with Massive Particles
    Autorzy:
    Ghenam, L.
    El Djoudi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402384.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    12.38.Mh
    12.39.Ba
    05.70.-a
    05.70.Ce
    05.70.Fh
    64.10.+h
    Opis:
    We consider a mixed system of hadronic and quark-gluon plasma (QGP) phases in a finite volume, and use a phenomenological approach with two phases matter equations of state to study the occurring deconfinement phase transition with varying temperature and/or chemical potential. We take into account massive particles in both phases, and calculate several physical quantities describing well the system at the phase transition. We probe the behaviour of these quantities, by examining their variations with temperature and volume at fixed chemical potential, as well as with chemical potential and volume at fixed temperature, in three dimensional plots, and obtain the finite size effects on the deconfinement phase transition.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-341-B-343
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Stable or Unstable Regions in 2-Dimensional Chaotic Forms: Examples and Simulations
    Autorzy:
    Skiadas, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399051.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    95.10.Fh
    47.52.+j
    05.45.Pq
    98.62.-g
    47.32.C-
    47.32.Ef
    45.20.dc
    Opis:
    We analyze 2-dimensional chaotic forms resulting from very simple systems based on two chaotic characteristics that is rotation and parallel movement or translation in geometric terms. Reflection is another alternative, along with rotation, for several interesting chaotic formations. Rotation and translation are very common types of movements in the world around us. Chaotic or non-chaotic forms arise from these two main generators. The rotation-translation chaotic case presented is based on the theory we analyzed in the book and in the paper. An overview of the chaotic flows in rotation-translation is given. There is observed the presence of chaos when discrete rotation-translation equation forms are introduced. In such cases the continuous equations analogue of the discrete cases is useful. Characteristic cases and illustrations of chaotic attractors and forms are analyzed and simulated. The analysis of chaotic forms and attractors of the models presented is given along with an exploration of the characteristic or equilibrium points. Applications in the fields of astronomy-astrophysics (galaxies), chaotic advection (the sink problem) and Von Karman streets are presented.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 1082-1086
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compound heterozygous LDLR variant in severely affected familial hypercholesterolemia patient
    Autorzy:
    Al-Allaf, Faisal
    Alashwal, Abdullah
    Abduljaleel, Zainularifeen
    Taher, Mohiuddin
    Bouazzaoui, Abdellatif
    Abalkhail, Hala
    Al-Allaf, Ahmad
    Athar, Mohammad
    Powiązania:
    https://bibliotekanauki.pl/articles/1038687.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    familial hypercholesterolemia (FH)
    low-density lipoprotein receptor (LDLR)
    compound heterozygous
    missense variant
    frameshift variant
    sequencing
    Arab
    coronary artery disease (CAD)
    cholesterol
    genetics
    Opis:
    Familial hypercholesterolemia (FH) is most commonly caused by mutations in the LDL receptor (LDLR), which is responsible for hepatic clearance of LDL from the blood circulation. We described a severely affected FH proband and their first-degree blood relatives; the proband was resistant to statin therapy and was managed on an LDL apheresis program. In order to find the causative genetic variant in this family, direct exon sequencing of the LDLR, APOB and PCSK9 genes was performed. We identified a compound heterozygous mutation in the proband with missense p.(W577C) and frameshift p.(G676Afs33) variants at exons 12 and 14 of the LDLR gene respectively. DNA sequencing of LDLR gene from the parents demonstrated that the missense variant was inherited from the mother and frameshift variant was inherited from the father. The frameshift variant resulted in a stop signal 33 codons downstream of the deletion, which most likely led to a truncated protein that lacks important functional domains, including the trans-membrane domain and the cytoplasmic tail domain. The missense variant is also predicted to be likely pathogenic and affect EGF-precursor homology domain of the LDLR protein. The segregation pattern of the variants was consistent with the lipid profile, suggesting a more severe FH phenotype when the variants are in the compound heterozygous state. The finding of a compound heterozygous mutation causing severe FH phenotype is important for the genotype-phenotype correlation and also enlarges the spectrum of FH-causative LDLR variants in the Arab population, including the Saudi population.
    Źródło:
    Acta Biochimica Polonica; 2017, 64, 1; 75-79
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of spread spectrum transmission in the aspect of radio communications security
    Zastosowanie transmisji z widmem rozproszonym w aspekcie bezpieczeństwa łączności radiowej
    Autorzy:
    Król, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/30145370.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
    Tematy:
    communication security
    operating mode
    radio communications
    Polish Armed Forces
    frequency hopping
    FH
    SINCGARS
    HAVE QUICK
    narrow band hopping
    broadband hopping
    bezpieczeństwo łączności
    tryb pracy
    łączność radiowa
    Polskie Siły Zbrojne
    hopping wąskopasmowy
    hopping szerokopasmowy
    Opis:
    This publication considers the use of spread spectrum transmissions in the aspect of threats to radio communications security. Numerous restrictions related to the previous use of specific operating modes of VHF, UHF and KF radio stations with reference to the possibilities of counteracting on the part of a potential enemy using the most modern EW (electronic warfare) systems, as well as those based on the procedures of the Russian Federation Armed Forces.
    W niniejszej publikacji poddano pod rozwagę wykorzystanie transmisji z widmem rozproszonym w aspekcie zagrożeń bezpieczeństwa łączności radiowej. Wskazano na liczne ograniczenia związane z dotychczasowym wykorzystywaniem określonych trybów pracy radiostacji VHF, UHF oraz KF w odniesieniu do możliwości przeciwdziałania ze strony potencjalnego przeciwnika wykorzystującego najnowocześniejsze systemy WRE, a także bazujące na procedurach SZ Federacji Rosyjskiej.
    Źródło:
    Scientific Journal of the Military University of Land Forces; 2020, 52, 1(195); 121-134
    2544-7122
    2545-0719
    Pojawia się w:
    Scientific Journal of the Military University of Land Forces
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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