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Tytuł:
Examination of Different Heat Exchangers and the Thermal Activities of Different Designs
Autorzy:
Ipek, O.
Kan, M.
Gurel, B.
Powiązania:
https://bibliotekanauki.pl/articles/1031281.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
heat exchangers
compact heat exchanger
micro channel heat exchanger
Opis:
In this study, instead of gasketed or brazed plate heat exchangers, which are used in various fields of application, a direct metal sintering method is used to design a heat exchanger with its original geometry and with different geometries. Studies of heat exchangers found in published literature were reviewed, and the thermal behaviors of the proposed unique designs were examined. Usually heat exchangers using this design do not use channel spacing angles of 30-45-60-75° for the plate ducts. The thermal behaviors of the fluid-circulating systems were analyzed using ANSYS FLUENT software, and they used the boundary conditions found in the literature for this design. Heat transfer between the heat exchanger channels and channel walls was calculated. The analyses results show that an increase in the amount of heat transfer surface area and also an increase in surface roughness increased the amount of positive heat transfer.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 580-584
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of Positron Implantation Profile in Different Materials
Autorzy:
Dryzek, J.
Powiązania:
https://bibliotekanauki.pl/articles/2042176.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ji
78.70.Bj
Opis:
The objective of this paper is experimental studies of the linear absorption coefficient, or mean penetration depth of positrons emitted from $\text{}^{22}$Na isotope in different materials. For this purpose we constructed a new experimental setup which allows us to scan the depth implantation profile of positrons. For the studied metals: Mg, Al, the obtained values of mean penetration depth coincide well with those which can be calculated using the mathematical formula commonly used but for Si and S the discrepancy has been observed similarly like for polymers.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 598-607
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Microstructures of ZnO Nanocrystals Fabricated by Different Methods
Autorzy:
Oral, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399660.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Wx
Opis:
ZnO nanocrystalline powders were fabricated by the solutions prepared by dissolving zinc acetate in isopropyl alcohol. Ethanolamine was used to enhance the solubility of acetates. Nanocrystalline powders were obtained either from the dried gels or precipitated solutions followed by calcination at different temperatures. Microstructural characterization of the powders showed that both morphology and the crystallite size of powders significantly altered based on the fabrication method and the calcination temperature.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 169-170
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparison of Different Theoretical Models of Positron Lifetime Spectra for Polymers
Autorzy:
Kansy, J.
Powiązania:
https://bibliotekanauki.pl/articles/1812531.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
The same reference positron lifetime spectra of polyurethane, measured in temperature range 112 to 390 K, were analyzed with three theoretical models: the "conventional" model with three exponential decay component of discrete values of lifetimes, a model with one discrete exponential component and two "packages" of exponentials with log-normal distribution of annihilation rates, and a model considering positronium slow localization, positronium internal relaxation as well as "delayed" formation of positronium. It turns out that the two latter models fit to the experimental data with the same excellent quality, in spite of the fact that in both models the ratio of intensities related to para-positronium and ortho-positronium was constrained to be as 1:3.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1397-1407
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulating the Electron Transmission with Different Defective Carbon Nanotubes
Autorzy:
Nizam, R.
Rizvi, S.
Azam, A.
Powiązania:
https://bibliotekanauki.pl/articles/1419854.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.22.-f
Opis:
2. The transmissions of forty-eight carbon nanotube geometries to form twenty-four intramolecular junctions between every two carbon nanotubes and two simple carbon nanotubes are also taken for investigating numerically. These forty-eight carbon nanotubes form three different kinds of intramolecular junctions, which mean that each sixteen carbon nanotubes are identical to either sixteen carbon nanotubes in all respect, except three different intramolecular junctions in between them. The three intramolecular junctions, named as circumferential defective carbon nanotubes, grouped defective carbon nanotubes and distributed defective carbon nanotubes. The nature of electronic states at the interfaces and in the semiconductor section is analyzed with the help of tight-binding method. These quantum transmissions have been compared among the different defective carbon nanotubes and have been correlated with the pentagon and heptagon that formed in the intramolecular junction. It has been simulated that each pair of semiconductor-semiconductor carbon nanotubes, semiconductor-metallic carbon nanotubes and metallic-metallic carbon nanotubes transmission affect on the presence of junctions pentagons-heptagons. The least deviations transmission is observed in the circumferential defective carbon nanotubes rather than in other two and the maximum deviations are seen in the grouped defective carbon nanotubes irrespective of the joining of the carbon nanotube interface.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 190-196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phonon Images of Crystals for Different Sources
Autorzy:
Jasiukiewicz, Cz.
Paszkiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1929612.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.Kl
66.70.+f
Opis:
The focusing patterns for energy and quasi-momentum are obtained for different types of phonon sources. We considered point and extended (Gaussian) sources and sources of monochromatic and Planckian phonons.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 459-473
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sonochemical Synthesis of Hydroxyapatite Nanoparticles with Different Precursor Reagents
Autorzy:
Hazar Yoruç, A.
İpek, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1491376.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.J-
Opis:
Different precursor chemicals ($3Ca(OH)_2,$ $Ca(NO_3)_2$ and $CaO$ as $Ca^{2+}$ sources, $H_3PO_4$ and $(NH_4)_2HPO_4$ as $PO_4^{3-}$ sources were used to synthesis of nanosized hydroxyapatite powder with ultrasonic precipitation method. The effect of different chemical precursors was investigated. Sample characterization was achieved by powder X-ray diffraction, the Fourier transformed infrared transmission spectroscopy, zeta sizer, scanning electron microscopy, density and surface area measurements.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 230-232
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Different Fluxes on Thermal Behavior of Floor Tile Glazes
Autorzy:
Ozturk, Z.
Yildiz, B.
Powiązania:
https://bibliotekanauki.pl/articles/1401322.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
Opis:
Nepheline-syenite is a fluxing agent used in sanitary ware, electrical porcelain and chinaware bodies, in order to reduce firing temperature and to increase the alkali level in the liquid glassy phase. Compared to pure feldspars, the advantages coming from the use of nepheline-syenite are: (i) the content of potassium and sodium is higher and (ii) the melting temperature is generally lower than that of potassium-feldspar, which always contains other phases, such as quartz, which shift the melting point to higher temperatures. The content of Al₂O₃ is high and the content of SiO₂ is lower in nepheline-syenite with respect to feldspars (considering that in feldspar Al₂O₃/SiO₂ is about 0.2, whereas in nepheline Al₂O₃/SiO₂ is 0.5). The aim of this study is to compare the influence of the nepheline-syenite and feldspars on the thermal behavior of the floor tile glazes. For this aim; several formulations were prepared with industrial raw materials. After applying the glazes on bodies; the compositions were fired in industrial floor tile kiln ( ≈1190°C, for 43 min). Thermal behaviors of glazes were measured by hot stage microscope and the crystalline phases were identified by X-ray diffraction. Color properties and glossiness were measured for comparing the aesthetic characteristics.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1183-1185
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Field Changing on Two Qubit Entanglement with Different Criteria
Autorzy:
Mirzaee, M.
Batavani, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398634.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Ud
Opis:
We investigate the effect of field changing on two qubit entanglement. We choose the coherent state, the cat state and the squeezed state as different states of interacting field with atom. The correlation between two qubits can be degraded by environmental noise, this phenomenon has been labelled sudden death of entanglement. The double Jaynes-Cummings model as a solvable model is used for describing the dynamic of sudden death of entanglement. We measure two-qubit entanglement using the concurrence and the negativity. The Fisher information is introduced, too, and compares results with previous entanglement measures. Finally we conclude that the Fisher information is not an entanglement measure.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 663-668
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of Pulverised Coal Fired Boiler with Different Burner Geometries
Autorzy:
Gurel, B.
Ipek, O.
Kan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402493.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
44.15.+a
Opis:
Pulverized coal combustion is extensively used in utility boilers, industrial boilers, furnaces, kilns, and other energy conversion appliances. The effective utilization of pulverized coal is the main problem in study of combustion processes, particularly in burning low-grade coal. It is well known that the emission of nitrogen oxides $(NO_{x})$ during coal combustion is a main environmental problem. In this study, three different pulverised coal burner geometries for a pulverised coal fired boiler have been studied by numerical analysis. GLI-Tunçbilek coal was used as fuel. Three-dimensional numerical analysis was carried out using Ansys Fluent code. Realizable K-ε turbulence method, single rate devolatilization method, multiple char combustion method and second-order upwind discretization method were used during calculations. Coal particle diameter and coal mass flow rate were assumed to be 70 μm and 378 kg/h respectively.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-43-B-45
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of Different SAW Oscillators Topologies for High Frequency Gas Sensors Construction
Autorzy:
Pasternak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1506822.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.35.+z
68.35.Ja
Opis:
In general, there are three possible kinds of surface acoustic wave devices that may be applied for high frequency gas sensor construction: delay lines, one- and two-port resonators. Choice among them depends on individual preferences and sometimes it is the matter of chance. In the paper the key differences among the surface acoustic wave devices important from the gas sensors technology point of view are described.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1232-1234
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of the Surface Impedance of Conductive Ferromagnetic Films on Different Substrates
Autorzy:
Nurgaliev, T.
Powiązania:
https://bibliotekanauki.pl/articles/1813604.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.47.Lx
75.70.-i
Opis:
The microwave surface impedance of conductive ferromagnetic films hypothetically deposited on dielectric, metal and superconducting substrates was numerically investigated for the case when the film is tangentially magnetized. It was shown that the surface impedance is governed by the ferromagnetic film conductivity if the film is thin enough. Peculiarities of the impedance caused by the ferromagnetic resonance arise more clearly in thicker ferromagnetic films or in films deposited on substrates of higher permittivity or on metal and superconducting substrates. A ferromagnetic film strongly affects the surface impedance of superconducting material, especially, in the ferromagnetic resonance frequency region.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 187-190
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlated Electron Systems of Different Dimensionalities
Autorzy:
Kurzyk, J.
Wójcik, W.
Spałek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1812297.pdf
Data publikacji:
2008-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
71.30.+h
71.10.Fd
Opis:
The optimized single-particle wave functions contained in the parameters of the Hubbard model (hopping integral t and intraatomic interaction U) are determined explicitly in the correlated state for electronic systems of various symmetries and dimensions: Hubbard chain, square and triangular lattices, and the three cubic lattices: SC, BCC, and FCC. In effect, the electronic properties of these structures as a function of the interatomic distance R are obtained. In most cases, the model parameters do not scale linearly with the lattice constant. Also, the atomic part of the total ground state energy changes with the U/t ratio and therefore should be (and is) included in the analysis. The solutions of dimensions D>1 are analyzed by utilizing the approximate Gutzwiller treatment.
Źródło:
Acta Physica Polonica A; 2008, 114, 1; 175-178
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of radiation attenuation coefficients in concretes containing different wastes
Autorzy:
Özavci, S.
Çetın, B.
Powiązania:
https://bibliotekanauki.pl/articles/1068130.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.52.Fa
28.41.Qb
Opis:
Environmental wastes can be cleaned in a very long time by ecosystem. However, the cleaning power of the ecosystem is not enough. For this reason, the evaluation of the different areas of waste processing is important. In this study attenuation coefficient of gamma rays has been investigated for concretes containing different amounts of glass, bulb and plastic wastes.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 316-317
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Harmonic generation analyses of memristor with different barriers and neuron
Autorzy:
Babacan, Y.
Kacar, F.
Powiązania:
https://bibliotekanauki.pl/articles/1068338.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.40.Bh
85.25.Hv
Opis:
We investigated the Fourier transform of memristor with various barriers and neuristor. To provide the different barriers we present a simple adaptive model dependent on input signal. We saw that there was no significant change of the harmonics with increasing barriers. Neurons provide an energy and area efficient and could be used in neuromorphic circuits. We used a neuron circuit that can be efficient to provide second and higher harmonics. Neuron circuit generates various spike shapes like regular spike, fast spike, initial bursting, chattering, etc. In this paper we analysed the Fourier transform of the most common spike shapes. The neuron or neuristor can be more efficient to generate second and higher harmonics compared to the other standard circuits.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 226-227
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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