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Wyświetlanie 1-15 z 21
Tytuł:
Parking in the City
Autorzy:
Šeba, P.
Powiązania:
https://bibliotekanauki.pl/articles/2047828.pdf
Data publikacji:
2007-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.20.-y
02.50.Cw
82.20.Mj
Opis:
We show that the spacing distribution between parked cars can be obtained as a solution of certain linear distributional fixed point equation. The results are compared with the data measured on the streets of Hradec Králové. We also discuss a relation of these results to the random matrix theory.
Źródło:
Acta Physica Polonica A; 2007, 112, 4; 681-690
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards Understanding of Influence of Restricted Geometry on Self-Diffusion in Porous Media
Autorzy:
Stankovic, I.
Powiązania:
https://bibliotekanauki.pl/articles/1795709.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.56.Lz
82.33.Ln
83.10.Mj
82.75.Fq
Opis:
Novel simulation procedure of self-diffusion through model porous media is presented. The procedure is based on extensive use of molecular dynamic method. The introduced diffusion simulations have a potential to become a valuable design and development tool applications involving transport in porous media, e.g. filters or porous sensors. The porous membranes are created using phase-separating model with high surface tension and its properties are characterized and compared with existing porosimetry measurements and small angle scattering experiments. These membranes are then filled with a gas of diffusing particles. Relations between transport coefficients and material structure are discussed.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 701-704
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of Aging on the Hardness and Wear Behaviour of 2124 Al Alloy/B₄C Composites
Autorzy:
Öksüz, K.
Oskay, K.
Powiązania:
https://bibliotekanauki.pl/articles/1401388.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Cd
88.30.mj
81.05.Ni
Opis:
The particulate reinforced aluminum alloy matrix composites are being increasingly used for wear component applications. The influence of matrix aging treatment on wear behavior in a powder metallurgy 2124 Al-B₄C composite was investigated. The aging responses of 2124 Al-B₄C metal matrix composite (MMC) and unreinforced matrix alloy are studied and related to variations in wear resistance properties. The MMC is aged resolution treated. Accelerated aging occurs in both MMC conditions, compared with unreinforced alloy. Wear resistance and hardness were substantially higher in the reinforced alloys. The effects of the percentage of boron carbide addition on the microstructure, hardness and wear tests of the produced material are discussed. The effects of the age hardening process are also considered.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1367-1369
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Molding Condition on Waviness Profile of GFRP Composites in Compression Molding
Autorzy:
Kim, J.
Kim, H.
Lee, D.
Powiązania:
https://bibliotekanauki.pl/articles/1399878.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Lg
81.05.Qk
88.30.mj
Opis:
During compression molding of glass fiber reinforced plastic composites, annealing and quenching experiment is conducted by changing pre-heating and cooling method. As results, major cause of unevenness that affects waviness profile (winding) is the shrinkage of matrix during holding and cooling process. Waviness profile of the surface on molding in glass fiber reinforced plastic composites will be lower when holding pressure load is higher, mold temperature is lower during demolding, and cooling rate is slower. In addition, surface roughness of moldings is depending on holding pressure load compared with mold temperature. According to molding condition of glass fiber reinforced plastic composites, waviness profile of surface can be quantitatively estimated using the proposed equation.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 337-340
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser Sheet Scattering and the Cameras Positions in Particle Image Velocimetry
Autorzy:
Ilić, J.
Čantrak, Dj.
Srećković, M.
Powiązania:
https://bibliotekanauki.pl/articles/2047893.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Fx
42.62.Eh
42.68.Mj
42.79.Qx
Opis:
Simulations of laser sheet scattering by microparticles, based on the generalized Lorenz-Mie theory for the case of numerous random spatial distributions of scattering particles, were done, using the novel computational time saving strategy. This type of scattering by particles immersed in a fluid flow and its recording on cameras, presents the essence of particle image velocimetry systems. The continuous and large change of the intensity of a scattered light falling on the camera causes the sequences of images of varying quality, which makes many of them useless. This paper shows how the problem could be alleviated by determining the angles of low relative standard deviation of scattered light intensity and using them for recording, as well as by avoiding the angles of high relative standard deviation of scattered light intensity.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1113-1118
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of yttria on the phase formation and sintering of HA-Al₂O₃ biocomposites
Autorzy:
Öksüz, K.
Özer, A.
Powiązania:
https://bibliotekanauki.pl/articles/1057899.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.J-
87.85.jj
81.07.-b
88.30.mj
87.85.Lf
Opis:
Hydroxyapatite is very-well known as the main component of hard tissues and, as such, it has attracted much attention by researchers in the recent decades. This study was aimed to present the characterization of Y₂O₃ doped 50 wt.% hydroxyapatite - 50 wt.% Al₂O₃ composite materials fabricated at relatively high temperature of 1600°C. Hydroxyapatite powder was obtained from bovine bones via calcination and ball milling technique. Fine powders ( ≤ 1 μm) of hydroxyapatite/Al₂O₃ were admixed with 0.5 and 1 wt.% Y₂O₃ powders. Powder compacts were sintered at 1600°C for 4 h in air atmosphere. The field emission scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffraction studies following the relative density measurements were conducted. Moreover, the microhardness was studied as the mechanical property of sintered samples. The effect of increasing Y₂O₃ content on surface morphology, elemental distribution and phase evaluation was investigated in hydroxyapatite/Al₂O₃ biocomposite materials. It was found that by increasing Y₂O₃ content, the relative density increased up to 98.8%, while the hardness increased to 863 HV_{(0.2)}. The main phases, which were found, are Hibonite - CaO(Al₂O₃)₆ and beta-tricalcium phosphate - Ca₃(PO₄)₂, according to X-ray diffraction pattern.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 576-579
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processing and Mechanical Properties of B₄C/Diamond Impregnated Fe/Co MMC
Autorzy:
Öksüz, K.
Şimşir, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401304.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
81.05.ug
88.30.mj
81.40.Pq
81.05.Ni
Opis:
Cobalt is currently used in the production of diamond reinforced metal matrix composites (i.e. stone-cutting tools). Herein, how sintering temperature and matrix composition influences the material properties of diamond reinforced MMCs was explored. The aim of this work is to produce diamond reinforced metal matrix composites based on Fe-Co compositions with and without B₄C are processed by a PM method using a hot pressing technique. The effects of Fe and B₄C additions on the characteristic of diamond impregnated Co matrix composites have been investigated. Samples reinforced with and without B₄C having two different compositions (different Fe/Co ratio) were produced under 25 MPa pressure and sintered at 1000°C temperature. After sintering, hardness tests were carried out and wear tests were performed by pin-on-disc. The results showed that addition of Fe caused slightly decrease in the hardness of the matrix. However, reinforcing with B₄C increased the hardness of the matrix. It is observed that wear resistance of B₄C reinforced Fe-Co metal matrix composite was greater than that of composites without reinforcement. SEM and EDX techniques were used to characterize the composites.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1139-1141
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Dynamics of Colloidal Suspensions Studied by Means of XPCS
Autorzy:
Patkowski, A.
Gapinski, J.
Fluerasu, A.
Holmqvist, P.
Meier, G.
Lettinga, M.
Nägele, G.
Powiązania:
https://bibliotekanauki.pl/articles/1812242.pdf
Data publikacji:
2008-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.15.Vv
83.10.Mj
82.70.Dd
Opis:
Structure and dynamics of suspensions of charged colloidal spheres in water were studied by means of small-angle X-ray scattering and X-ray photon correlation spectroscopy using synchrotron radiation. Experimentally obtained dependences on the scattering vector q of the structure factor S(q), short-time collective diffusion coefficient D(q) and hydrodynamic function H(q) were in good agreement with theoretical predictions. No effect of screening of the hydrodynamic interactions, suggested in the literature, was found. The conditions are discussed at which the maximum of the hydrodynamic function peak value H(q_m) can be obtained experimentally.
Źródło:
Acta Physica Polonica A; 2008, 114, 2; 339-350
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Genetic Algorithm for Extraction of the Parameters from Powder EPR Spectra
Autorzy:
Spałek, T.
Pietrzyk, P.
Sojka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2043399.pdf
Data publikacji:
2005-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.60.Pn
02.60.Ed
76.30.Fc
82.75.Mj
61.43.Gt
Opis:
The application of the stochastic genetic algorithm in tandem with the deterministic Powell method to automated extraction of the magnetic parameters from powder EPR spectra was described. The efficiency and robustness of such hybrid approach were investigated as a function of the uncertainty range of the parameters, using simulated data sets. The discussed results demonstrate superior performance of the hybrid genetic algorithm in fitting of complex spectra in comparison to the common Monte Carlo method joint with the Powell refinement.
Źródło:
Acta Physica Polonica A; 2005, 108, 1; 95-102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neutron Diffraction Study and Deformation Behavior of a Composite Based Mg Alloy Reinforced by Short Saffil Fibers
Autorzy:
Farkas, G.
Máthis, K.
Pilch, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402148.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.Bx
88.30.mj
61.72.Hh
Opis:
In the present work neutron diffraction has been applied for ex situ investigation of residual stresses in Mg-4%Al-1%Ca (AX41) magnesium alloy reinforced with short Saffil fibers. Samples were deformed in compression at room temperature. Two types of fiber arrangement were investigated. In both samples the fibers were homogeneously distributed and arranged in parallel planes with a random fiber orientation. In the first sample these planes were parallel with the loading axis and in the second one they were perpendicular to the loading direction. Significant dependence of both the mechanical properties and residual strains on the fibers orientation was observed. Sample with parallel fiber arrangement showed higher hardness and lower ductility. Further the increment of residual tensile lattice strain in the matrix with a macroscopic deformation is much higher than in the other case. It was found that the residual strain evolution strongly depends on the orientation of grains in the matrix.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 758-761
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonequilibrium Effects in a Bimolecular Chemical Reaction in a Dilute Gas
Autorzy:
Cukrowski, A. S.
Fritzsche, S.
Popielawski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929592.pdf
Data publikacji:
1993-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.20.-w
82.20.Mj
82.20.Wt
82.30.Eh
05.20.Dd
Opis:
Perturbation solution of the Boltzmann equation for a dilute gas with a chemical reaction A + A → B + B is presented. Analytical results for the nonequilibrium effects on the rate of chemical reaction are obtained for the line-of-centers model. It is shown that taking into account the energy transfer from reagents A to products B permits to get new results. The nonequilibrium corrections obtained from these results are much larger than those obtained with neglecting this energy transfer. These results are verified by a comparison with the numerical results obtained from the modified Nanbu-Babovsky Monte Carlo computer simulations.
Źródło:
Acta Physica Polonica A; 1993, 84, 2; 369-382
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of iron nanowires oxidation on their semiconducting properties
Autorzy:
Krajewski, M.
Gołasa, K.
Wasik, D.
Powiązania:
https://bibliotekanauki.pl/articles/1160259.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Gf
62.23.Hj
61.46.Km
78.67.Uh
82.53.Mj
81.16.Pr
Opis:
The main aim of this work was to study the impact of thermal annealing on the structure of iron oxide shell covering iron nanowires in relation to their semiconducting properties. Studied nanomaterial has been produced via a simple chemical reduction in an external magnetic field and then it has been thermally-treated at 400°C, 600°C and also 800°C in a slightly oxidizing argon atmosphere. Annealed iron nanowires have been characterized by means of the Raman spectroscopy and photoluminescence in order to study the structure of iron oxide shell and its influence on semiconducting properties of the whole nanostructure. According to obtained experimental results, the composition of iron oxide shell covering the studied nanomaterial is changing with annealing temperature. The thermal treatment at 400°C leads to oxidation of iron coming from the core of nanomaterial and formation of a mixture of Fe₃O₄ and α -Fe₂O₃ on the surfaces of nanowires, while annealing at higher temperatures results in further oxidation of iron as well as the phase transformation of previously created Fe₃O₄ into the most thermodynamically stable form of iron oxide at ambient conditions - α -Fe₂O₃. This oxide has a major impact on the semiconducting properties of studied nanomaterial. Thereby, the measurements of photoluminescence enabled to estimate the bandgap of bulk and surface layer at about 1.8 eV and 2.1 eV, respectively.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-135-A-137
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Dielectric Relaxation in Binary Mixtures of Mesogenic Solvent/Non-Mesogenic Solute
Autorzy:
Jadżyn, J.
Bauman, D.
Déjardin, J. -L.
Ginovska, M.
Czechowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/2043683.pdf
Data publikacji:
2005-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.Eb
64.70.Md
87.15.Nn
68.35.Rh
83.10.Mj
Opis:
Dielectric relaxation studies for mixtures of strongly polar and mesogenic n-heptylcyanobiphenyl with non-polar and non-mesogenic carbon tetrachloride (CCl$\text{}_{4}$) were performed. The absorption band broadening due to fractional diffusion was observed. A correlation between the non-mesogenic admixture concentration and the anomalous diffusion exponent was found.
Źródło:
Acta Physica Polonica A; 2005, 108, 3; 479-489
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theory of Translational Energy Relaxation in Binary Mixtures of Dilute Gases with Chemical Reaction
Autorzy:
Cukrowski, A. S.
Fritzsche, S.
Popielawski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1924286.pdf
Data publikacji:
1992-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.20.Rp
82.20.-w
82.20.Mj
82.20.Wt
05.20.Dd
Opis:
A simple approach to the process of translational energy relaxation in dilute gases due to Dahler, Malkin, Shizgal and others is extended to the case of systems with chemical reaction. Fundamental quantities characterizing the relaxation processes such as the relaxation time and collision numbers during this time are computed for a number of molecular models of the chemical reaction (the Prigogine-Xhrouet model, the line-of-centers model, a modified line-of-centers model, and reverse versions of these models). Results of this analytical theory are compared with the results of numerical simulations of solutions of the appropriate Boltzmann equation with the use of the modified Nanbu-Babovsky method. This comparison leads to very good agreement between the analytical theory and numerical calculations. A marked influence of the chemical reaction on the translational relaxation in a dilute gas is another important conclusion of this paper.
Źródło:
Acta Physica Polonica A; 1992, 82, 6; 1005-1022
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of Phase Diagram and Glass Transitions of a Liquid Crystal with Ferro- and Antiferroelectric Phases
Autorzy:
Kolek, Ł.
Massalska-Arodź, M.
Majda, D.
Suchodolska, B.
Zalewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1399005.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.kj
64.70.mj
64.70.pp
Opis:
Based on the results of the differential scanning calorimetry, of transmitted light intensity measurements and of texture observations the phase diagram of 4-(6-heptafluorobutanoiloxyhexyloxy)biphenyl-4'-carboxylate(S)-4-(methyloheptyloxy-1-carbonyl)-phenyl (4H6) was obtained. The following phases were identified on cooling: isotropic, smectic A, smectic C*, smectic $C_{A}^\ast $ phases and a highly ordered phase called SmX and its glass. During heating transformation from glass of SmX to SmX phase and then transition to a metastable Cr2 phase, evolving to the more stable Cr1 phase, were observed. On further heating $ SmC_{A}^\ast $, SmC* and Sm phases were identified. When Cr2 was cooled, a glass transition was also observed.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 909-912
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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