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Wyświetlanie 1-15 z 1840
Tytuł:
LO-Phonon Band Filling by Means of Charge Carriers Accelerated in Electric Fields
Autorzy:
Raguotis, R.
Brazis, R.
Powiązania:
https://bibliotekanauki.pl/articles/1506223.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.45.+h
78.30.-j
42.55.-f
72.10.-d
72.20.Ht
Opis:
Electron and phonon distribution in momentum space is modeled using Monte Carlo method. Calculated LO phonon distribution in zinc-blende GaN deviates dramatically from the thermal equilibrium (Planck) function, and well coincides with the phonon number elucidated from the existing anti-Stokes Raman scattering experiments.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 247-249
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of Free Volume due to Rigidness of Polymeric Matrix and Effects on Gas Transport Properties
Autorzy:
Checchetto, R.
Brusa, R.
Powiązania:
https://bibliotekanauki.pl/articles/1033890.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.35.Lr
61.25.hp
36.10.Dr
78.70.Bj
Opis:
Gas barrier properties of polymeric membranes with different rigidness of their matrix where studied by gas phase permeation measurements. Gas transport results in membranes made of epoxy resin with different cross linking densities and epoxy resin with dispersed few layer graphene fillers were discussed and compared in the framework of the free volume theory of diffusion. Transport in cellulose membranes was found to occur in the diffusion configurational regime. The physical description of the transport properties was based on positron annihilation lifetime spectroscopy measurements which allowed to evaluate experimentally the fractional free volume in epoxy resin membranes and the size of rigid elongated cavities in cellulose thin films.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1490-1495
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of a Magnetic Field on the Formation of Corrosion Defects in Selected Metals and Steels, Analysed Using Positron Annihilation Method
Autorzy:
Pietrzak, R.
Szatanik, R.
Powiązania:
https://bibliotekanauki.pl/articles/1196102.pdf
Data publikacji:
2014-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
61.72.Cc
82.45.Bb
Opis:
The method of positron lifetime measurement was used to analyse the influence of a magnetic field on the kinetics of corrosion defect formation in near-surface layers of iron, titanium as well as S20 and S0H18N9 steel grades. The listed metals, which belong to ferro- and paramagnetic materials, have different sensitivity to corrosion. It was found that not only the presence of a magnetic field, but also its direction influence the dimensions and the concentration of defects formed during corrosion.
Źródło:
Acta Physica Polonica A; 2014, 125, 3; 733-736
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Phonon Emission on Electron Transport in Hexagonal and Cubic Gallium Nitride
Autorzy:
Brazis, R.
Raguotis, R.
Powiązania:
https://bibliotekanauki.pl/articles/2041763.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.-d
72.20.Ht
72.80.Ey
Opis:
Electron transport characteristics of GaN crystals in high electric fields are shown to be essentially influenced by different optical phonon modes inherent to the hexagonal and cubic phases of these compound crystals. Additional optical phonon modes (≈26 meV) competing with the higher-energy ones (≈92 meV) in hexagonal GaN, together with the low-lying satellite valley (Γ$\text{}_{3}$), dramatically reduce the drift mobility of electrons in comparison with conventional models. Presented Monte Carlo data are in excellent agreement with the time-of-flight experiment. The cubic GaN crystal phase with its satellite electron energy valleys shifted well above the main (Γ$\text{}_{1}$) valley is chosen as a convenient medium for elucidating the role of high-energy longitudinal optical phonon accumulation. A simple efficient one-particle Monte Carlo method is proposed for an account of excess phonons. Phonon heating is shown to bring about the moderate additional reduction of the drift mobility and an increase in mean electron energy.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 324-327
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Medical Substances of Insulin
Autorzy:
Pietrzak, R.
Szatanik, R.
Powiązania:
https://bibliotekanauki.pl/articles/2043341.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Positrons lifetimes were measured in medical substances of insulin (human and animal), differing as far as the degree of purity and time of their activity in the organism are concerned. In all of the cases the spectrum of positron lifetime was distributed into three components, with the long-life component ranging from 1.8 to 2.08 ns and the intensity taking on values from 18 to 24%. Making use of Tao-Eldrup model, the average radius of the free volume, in which o-Ps annihilated, and the degree of filling in the volume were determined. It was found that the value of the long-life component for human insulin is higher than that of animal insulin. Moreover, the value of this component clearly depends on the manner of purification of the insulin. It was also noticed that there occurs a correlation between the value of this component and the time after which it begins to be active in the organism, as well as the total time of its activity.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 852-856
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transient Response of Electrons and Phonons in ZnTe Crystals
Autorzy:
Brazis, R.
Raguotis, R.
Powiązania:
https://bibliotekanauki.pl/articles/1813220.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.Di
72.20.Ht
72.15.Lh
78.45.+h
Opis:
The response of electron and phonon ensemble to the switching on and off electric field E in n-type ZnTe crystals is simulated by Monte Carlo method. The results at T=10 K show significant accumulation of LO-phonons and the LO phonon band population inversion with respect to the LA band;the inversion is necessary for the stimulated transfer of LO-LA energy difference to photons. The maximum inversion is at E=7 kV/cm. At T=300 K no phonon band inversion but fast (sub-picosecond) drift velocity switching with ≈100 GHz repetition is feasible.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 933-936
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatio-Temporal Dynamics of Chain of Coupled Impact Pendulums
Autorzy:
Stępień, R.
Kosiński, R. A.
Powiązania:
https://bibliotekanauki.pl/articles/1964195.pdf
Data publikacji:
1997-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.+b
Opis:
A chain of N, one-dimensional, impact pendulums is investigated using numerical solutions of equations of motion. Ranges of periodic, mixed and chaotic motion are found using spatio-temporal diagrams. A correlation function and power spectrum density functions are calculated for these digitized diagrams. Influence of the coupling strength k and the number of pendulums N on the dynamics of the system is discussed.
Źródło:
Acta Physica Polonica A; 1997, 91, 6; 1053-1059
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealed Alloy of Ising Magnets Within Two-Site Cluster Approximation
Autorzy:
Levitskii, R. R.
Sorokov, S. I.
Sokolovskii, R. O.
Powiązania:
https://bibliotekanauki.pl/articles/1964694.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.60.Cn
Opis:
Ising mixture with equilibrium disorder is considered. The nearest neighbour spin coupling and direct interatomic interaction are taken into account within two-site cluster approximation. Thermodynamic potential and q-dependent pair correlation function are obtained. Interplay between interspin and interatomic interactions, their influence on magnetic phase transition and alloy segregation are studied. Cluster fluctuations cause significant changes with respect to mean field theory: phase diagram complicates and magnetic properties deviate from those of quenched system.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 383-386
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Volume Ratio of Heat Rejection Process on Performance of an Atkinson Cycle
Autorzy:
Ebrahimi, R.
Powiązania:
https://bibliotekanauki.pl/articles/1030546.pdf
Data publikacji:
2018-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Atkinson cycle
heat rejection process
Opis:
The objective of this study is to analyze the effect of volume ratio of heat rejection process on the performance of dual cycle. Using finite-time thermodynamics, the relations between the volume ratio of heat rejection, the thermal efficiency, the power output, the heat transfer losses, the friction power and the compression ratio for an air standard Atkinson cycle have been derived. In the model, the nonlinear relation between the specific heats of working fluid and its temperature, the frictional loss and heat leakage loss are considered. The results show that the power output and the thermal efficiency first increase with the increase of volume ratio of heat rejection process and then start to decrease. The optimum value of the volume ratio of heat rejection which maximizes the power output is higher than that which maximizes the thermal efficiency, while the optimum value of the compression ratio which maximizes the power output is lower than that which maximizes the thermal efficiency. The results obtained in the present study provide guidance to the performance evaluation and improvement for practical internal combustion engines.
Źródło:
Acta Physica Polonica A; 2018, 133, 1; 201-205
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the Applied Current Density on the Structural and Magnetic Properties of the Electrodeposited Cobalt-Nickel Alloy Thin Films
Autorzy:
Özdemır, R.
Powiązania:
https://bibliotekanauki.pl/articles/1031697.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.40.Rs
82.45.Qr
81.15.Pq
Opis:
In this study, cobalt-nickel (Co-Ni) alloys were deposited electrochemically onto aluminum substrates under applied current densities of 103.8, 138.4, 173 and 207.6 A m¯². Influence of the applied current density on the structural and magnetic properties of the Co-Ni alloys was investigated. The bath for Co-Ni alloys deposition was composed of 0.08 mol l¯¹ CoSO₄·7H₂O, 0.2 mol l¯¹ NiCl₂·6H₂O, 0.1 mol l¯¹ NiSO₄·6H₂O and 0.25 mol l¯¹ H₃BO₃. The electrochemical investigation of Co-Ni alloys was completed using cyclic voltammetry and galvanostatic studies. Inductively coupled plasma analysis has shown that the amount of the cobalt in the deposited alloy has decreased from 73.61% to 67.01% with the increase of the applied current density from 103.8 to 207.6 A m¯². According to the magnetic analysis results, the values of coercivity coefficient of the deposited Co-Ni alloys range between 115 and 150 Oe, confirming ferromagnetic behavior of the alloys. Experiment results indicate that magnetic and structural properties of the Co-Ni alloy deposits are greatly influenced by the applied current density in the electrodeposition system.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 770-774
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic analysis of a cascade refrigeration system
Autorzy:
Karaali, R.
Powiązania:
https://bibliotekanauki.pl/articles/1065661.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.05.Sv
88.10.cn
Opis:
There is a need for cooling by using the waste heat energy in food industry. Absorption cycles can be driven by waste thermal, geothermal, solar or industrial processes energies. In this study, cascade refrigeration system is thermodynamically modeled, and analyzed by using first law of thermodynamics, and exergy method. Thermodynamic properties such as pressure, temperature, entropy, enthalpy, exergy, mass flow rate in each stream are calculated for 50, 75, 100°C and for 0.8, 1.0, and 1.5 MPa pump pressure. A computer program is used that was prepared in FORTRAN by the author for the analyses. It is found that the compression-absorption cascade cooling cycle is appropriate for most of the kind of waste heat applications. Increase of the generator inlet heat temperature increases the generator inlet heat, the absorber outlet heat and the condenser 2 outlet heat energies and decreases the coefficient of performance of the absorption and the overall cycles. The generator heat decreases with increase of the pump pressure. Also increase of the pump pressure decreases the coefficient of performance of the absorption and the overall cycles. Increase of the pump pressure and the generator temperature decreases the exergetic coefficient of performance. Increase of the generator temperature and pump pressure increases the generator inlet exergy. It is concluded that increase of the generator temperature and the pump pressure increases the total destructed exergy of the cycle.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 101-106
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hysteresis Effect in Mean-Field Model
Autorzy:
Pełka, R.
Powiązania:
https://bibliotekanauki.pl/articles/1199505.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.-d
75.50.Vv
75.60.Ej
Opis:
A simple feedback loop and a mean-field approximation are employed to simulate the memory effect in the exchange-coupled magnetic system. The nonlinearity of the feedback turns out to be the crucial factor for the appearance of hysteresis loops. A threshold value above which the hysteresis disappears is the mean-field transition temperature. Temperature dependence of the coercive field is investigated.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 28-29
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound Level Meter as Software Application
Autorzy:
Barański, R.
Powiązania:
https://bibliotekanauki.pl/articles/1360105.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.38.Kb
43.58.Dj
Opis:
Nowadays, technical possibilities to build and implement new solution in industry or scientists research are very wide. PC computer with dedicated environmental software makes building equipment previously reserved to FPGA systems possible. In this article we focus on building a sound level meter application. The main reason to undertake this problem was to check precision of sound level meter consisting of a dedicated computer program and the main board integrated sound card. All algorithms were implemented in LabVIEW 8.6, thus we call our system SLM_LV_v1.2c. In testing SLM_LV_v1.2c we have performed the calibration procedure in the Vibroacoustics Laboratory of the Department of Mechanics and Vibroacoustics (a Calibration Laboratory accredited by Polish Centre for Accreditation). The presented results show that our meter in a specific range meets requirements for 1st class sound level meters. Certainly, we can not use it as regular sound level meter without any other research like e.g. type approval, but at the same time we can consider it to be an inexpensive sound level indicator.At the end of the paper, we present results of comparison between measurements obtained with SLM_LV_v1.2c and the popular sound level meter SVAN 945A and show some sources of errors.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-66-A-70
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbonaceous Materials Obtained from Sewage Sludge for $NO_2$ Removal under Wet Conditions at Room Temperature
Autorzy:
Pietrzak, R.
Powiązania:
https://bibliotekanauki.pl/articles/1536471.pdf
Data publikacji:
2010-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
81.05.-t
81.05.Rm
82.65.+r
89.60.-k
Opis:
The effect of the processes of carbonisation and activation on adsorbents obtained from sewage sludge and their sorption properties towards $NO_2$ were studied. Carbonaceous adsorbents were obtained by carbonisation of sewage sludge at 600°C for four different times 30, 60, 90 and 120 min followed by activation of the carbonisates by $CO_2$ at 800°C for 60 min. Adsorption of $NO_2$ was carried out in wet air. It has been shown that by appropriate thermal and chemical treatment of sludge, mesoporous adsorbents capable of $NO_2$ removal can be obtained. The sorption abilities of the carbonised and activated samples to adsorb $NO_2$ have been shown to increase with increased time of carbonisation and reach maximum for the carbonisation maintained for 90 min. Further increase in this time causes a decrease in the adsorption abilities of the samples. The sorption properties of the carbonisates have been proved to be determined by the chemical character of the surface, while those of the activated samples - by the porous structure.
Źródło:
Acta Physica Polonica A; 2010, 118, 3; 487-492
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulations of Si and $SiO_{2}$ Etching in $SF_{6}+O_{2}$ Plasma
Autorzy:
Knizikevičius, R.
Powiązania:
https://bibliotekanauki.pl/articles/1538692.pdf
Data publikacji:
2010-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.77.Bn
81.65.Rv
Opis:
The plasma chemical etching of Si and $SiO_{2}$ in $SF_{6}+O_{2}$ plasma is considered. The concentrations of plasma components are calculated by fitting the experimental data. The derived concentrations of plasma components are used for the calculation of Si and $SiO_{2}$ etching rates. It is found that the reaction probabilities of F atoms with Si atoms and $SiO_{2}$ molecules are equal to ε = (8.75 ± 0.41) × $10^{-3}$ and ε = (7.18 ± 0.45) × $10^{-5}$, respectively. The influence of $O_{2}$ addition to $SF_{6}$ plasma on the etching rate of Si is determined.
Źródło:
Acta Physica Polonica A; 2010, 117, 3; 478-483
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1840

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