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Wyszukujesz frazę "62.20.-x" wg kryterium: Temat


Tytuł:
A Novel High Strain Rate Sensitive Rigid Polyurethane Resin Based Syntactic Foam
Autorzy:
Yazıcı, M.
Powiązania:
https://bibliotekanauki.pl/articles/1186501.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Pq
61.43.Gt
61.41.+e
62.20.-x
Opis:
Syntactic foams are closed cell structured foam materials and present improved properties for lightweight and high performance material requests. They have been widely used in naval, aeronautical, aerospace, civil, industrial, and automotive engineering applications on account of their good acoustical attenuation, excellent strength to weight ratio, vibration isolation, dielectric properties. In this study, a novel high strain rate sensitive syntactic foam was developed. A rigid polyurethane resin was used as a binder material. Glass bubbles were used as an additive for producing cell structure. Elastomeric silicone rubber resin were used to change elastic properties of the foam as an additional binder material. Quasistatic compression properties and high strain rate compression properties were obtained by using Instron Universal Tensile-Compression Machine and Split Hopkinson Pressure Bar experimental setup respectively. The results show that developed foams are low dense and very high strain rate sensitive materials. Consequently, developed foam can be used for the blast, impact or ballistic mitigation purpose as a coating material.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 613-616
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Emission Study of Plastic Instabilities in AlSi1MgMn
Autorzy:
Molnárová, O.
Dobroň, P.
Chmelík, F.
Powiązania:
https://bibliotekanauki.pl/articles/1402161.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.Le
81.40.Lm
62.20.F-
46.32.+x
Opis:
The influence of the strain rate and heat treatment on the occurrence of plastic instabilities in a cast AlSi1MgMn alloy was studied. The samples were uniaxially loaded in compression at various strain rates and at room temperature. The tests were done with concurrent acoustic emission monitoring and the acoustic emission parameters are correlated to the microstructure and to the stress-strain curves in order to better understand the patterns of plastic deformation. All samples exhibited the Portevin-Le Chatelier effect of different types, dependently on the heat treatment and the applied strain rate. The occurrence of the Portevin-Le Chatelier effect is manifested by acoustic emission signals with high amplitudes. Statistical analysis of the acoustic emission signals shows the power-law probability distribution.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 801-804
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustical Dissipation in Some Tetrahedrally-Bonded Semiconducting Compounds
Autorzy:
Kor, S. K.
Mehrotra, P.
Powiązania:
https://bibliotekanauki.pl/articles/1933450.pdf
Data publikacji:
1995-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.65.+k
62.20.-x
62.80.+f
Opis:
Phonon-phonon coupling and thermoelastic relaxation are the principal thermal causes of ultrasonic attenuation in solids at room temperature. Second order elastic moduli and third order elastic moduli have been used to study the ultrasonic attenuation suffered by compressional and shear acoustic waves for some tetrahedrally bonded semiconducting materials, viz. GaP, InP and InAs along ⟨100⟩, ⟨110⟩ and ⟨111⟩ crystallographic directions. Attenuation in case of InP is found to be quite large as compared to GaP and InAs. The reason behind this discrepancy is due to doping of Cr in InP sample and it is also seen that ultrasonic attenuation due to phonon-phonon interaction dominates over that due to thermoelastic relaxation.
Źródło:
Acta Physica Polonica A; 1995, 87, 6; 981-983
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acousto-Optic Tunable Filters for Imaging Applications in the 2-4 μm with Low RF Drive Power
Autorzy:
Valle, S.
Ward, J.
Pannell, C.
Johnson, N.
Powiązania:
https://bibliotekanauki.pl/articles/1383267.pdf
Data publikacji:
2015-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
78.20.hb
62.40.+i
Opis:
The $λ^{2}$ dependence on acoustic field intensity (and hence RF drive power) can render large aperture acousto-optic tunable filters impractical for many applications beyond about 2 μm. One potential technique for reducing the RF drive-power requirement is to configure an acousto-optic tunable filter such that the interaction region is at acoustic resonance. We describe an acousto-optic tunable filter that operates at resonance and present an analysis of the predicted performance. In addition, we address the practical issues in deploying such a scheme. Finally, we present results of a prototype "resonant acousto-optic tunable filter" operating in the 1-2 μm region.
Źródło:
Acta Physica Polonica A; 2015, 127, 1; 58-59
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Electron Mobility in Some "Problematic Materials" from Magnetoresistance Effect at High Magnetic Fields
Autorzy:
Shchennikov, V.
Kar'kin, A.
Ovsyannikov, S.
Morozova, N.
Powiązania:
https://bibliotekanauki.pl/articles/1418952.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.My
62.50.-p
61.80.-x
72.20.Jv
Opis:
Using examples of some perspective electronic materials (HgSeS, $Fe_3O_4$, InN, and others) it is shown that magnetoresistance data at high magnetic fields allow evaluating the true values of mobility of charge carriers in spite of any "adverse factors". Additional impacts involving high pressure and irradiation with high-energy particles (neutrons, electrons, ions) produce the enhancement of magnetoresistance technique of testing and allow to go into details of the type of electron structure and scattering mechanisms of charge carriers.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 544-547
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bond Strength of Basalt Based Glass-Ceramic Coatings
Autorzy:
Bayrak, G.
Ercenk, E.
Sen, U.
Yilmaz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1194582.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Fs
62.20.-x
61.05.cp
Opis:
In the present study, powders produced from the volcanic basalt rocks were coated on pre-coated AISI 1040 steel with Ni-5% Al bond coat by atmospheric plasma spray coating technique. The coated specimens were characterized by optical microscopy, scanning electron microscopy, metallography and X-ray diffraction. Bonding strength of coatings was evaluated in accordance with the ASTM C-633 method. Coated basalt material from the APS coating system was determined in the glassy amorphous state by X-ray diffraction analysis. The coated samples were heat-treated at 800C for 1-4 h for crystallization. The phases formed in the basalt base glass-ceramic coatings were augite, Fe-diopside, anorthite, and andesine which were detected by X-ray diffraction analysis. Basalt based glass-ceramic coatings include splat, porosity and un-melted particles which were the characteristic of plasma sprayed coatings. Experiment result showed that the crystallization time increase caused the decrease of the bond strengths of the coatings.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 620-622
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Materials by Raman Scattering
Autorzy:
Kozielski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2047294.pdf
Data publikacji:
2007-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.-j
62.20.-x
61.72.-y
36.20.Ng
Opis:
The paper reports on the use of phonon spectra obtained with the Raman spectroscopy for characterization of different materials. The Raman scattering spectra obtained for zinc selenide crystals, mixed crystals zinc selenide admixtured with magnesium or beryllium, oxide crystals including strontium lanthanum gallate, molecular crystals of triammonium hydrogen diseleniate and a homologous series of polyoxyethylene glycols are analysed.
Źródło:
Acta Physica Polonica A; 2007, 111, 3; 343-360
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Superelastic NiTi Alloys by Nanoindentation: Experiments and Simulations
Autorzy:
Frost, M.
Kruisová, A.
Sháněl, V.
Sedlák, P.
Haušild, P.
Kabla, M.
Shilo, D.
Landa, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402121.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.fg
46.15.-x
Opis:
NiTi-based shape memory alloys are metallic materials exhibiting remarkable response to mechanical and/or thermal loading, e.g. superelasticity, pseudoplasticity or one-way shape memory effect. They can be engineered into structures of micro-size dimensions, hence, they appear promising for application in micro-electromechanical systems. For their efficient utilization, appropriate characterization is important. Due to relative simplicity, indentation represents a very standard and popular technique for basic characterization of metallic materials providing information about stiffness and hardness. Moreover, it can be used for identification of other events in the material. This study aims to verify applicability of the recently developed constitutive model for NiTi-based shape memory alloy in simulations of nanoindentation tests. The model is fitted to a particular sample material using experimental data, and a series of simulations mimicking tests at various temperatures is performed. Since the model also captures two-stage martensitic transformation via the intermediate R-phase, its influence on the simulations is investigated as well. It is confirmed that spherical indentation is a suitable method for simple and fast detection whether the material is in superelastic or pseudoplastic regime.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 664-669
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Hardness and Wear Behaviour οf Boronized and Carburized AISI 8620 Steels
Autorzy:
Calik, A.
Duzgun, A.
Ekinci, A.
Karakas, S.
Ucar, N.
Powiązania:
https://bibliotekanauki.pl/articles/1585043.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
62.20.M-
62.20.Qp
68.35.Fx
Opis:
In this study, the hardness and wear behaviour of carburized and boronized AISI 8620 steels have been studied. The boronizing treatment increased the hardness of AISI 8620 steels from 395 $HV_{0.1}$ to a maximal 1610 $HV_{0.1}$ compared to the carburized steels and also significantly improved its wear behaviour. From obtained results, it can be concluded that boronizing is very effective surface hardening method for improving the wear properties of AISI 8620 steels.
Źródło:
Acta Physica Polonica A; 2009, 116, 6; 1029-1032
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between Processing Conditions, Lattice Defect Structure and Mechanical Performance of Ultrafine-Grained Materials
Autorzy:
Gubicza, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402059.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Dd
62.20.F-
61.72.Ff
81.07.Bc
62.20.-x
61.72.Mm
Opis:
The mechanical performance of ultrafine-grained materials is strongly influenced by the lattice defect structure, i.e. the vacancy concentration, the type, arrangement and density of dislocations, the planar fault probability, as well as the amount and character of grain boundaries. In this paper, the correlation between the processing conditions, the lattice defect structure and the plastic behavior of ultrafine-grained materials is overviewed. For the processing route of severe plastic deformation, the influence of applied strain, hydrostatic pressure, as well as melting point, stacking fault energy and alloying on grain size, dislocation density and strength is studied. For nanopowder sintering techniques, the effect of atmosphere, temperature and time of consolidation on lattice defects and mechanical properties is discussed in detail.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 479-486
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Density Functional Study of Bulk and Surface Properties of Rhodium Hydride
Autorzy:
Sudhapriyanga, G.
Asvinimeenaatci, A.
Rajeswarapalanichamy, R.
Iyakutti, K.
Powiązania:
https://bibliotekanauki.pl/articles/1195615.pdf
Data publikacji:
2014-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.A-
61.50.Ks
62.20.-x
68.35.Md
Opis:
The electronic properties and structural phase transition of bulk rhodium hydride are analyzed using density functional theory calculations with the generalized gradient approximations. The sequent phase transition is observed in bulk rhodium hydride. The predicted new high pressure phase of rhodium hydride is hexagonal NiAs type. The atomic geometry, adsorption energy, and binding energy of the Rh (111) surface are computed. The calculated surface energy for Rh (111) surface is 1.06349 eV and the maximum adsorption energy is obtained in 6×1 phase as 2.8617 eV. The relaxed geometries show that hydrogen has a strong influence on the interlayer distance.
Źródło:
Acta Physica Polonica A; 2014, 125, 1; 29-35
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design, Modeling and Simulation of MEMS Devices on Si, SiC, and Diamond for Harsh Environment Applications
Autorzy:
Kociubiński, A.
Bieniek, T.
Janczyk, G.
Powiązania:
https://bibliotekanauki.pl/articles/1199152.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Tp
07.07.Df
62.20.-x
62.25.Fg
Opis:
Set of micromechanical (MEMS) test structures designed for fabrication on silicon, silicon carbide and diamond substrates has been successfully designed. A dedicated mask-set development has been carried along with numerical simulations performed with assistance of a dedicated design and modelling CoventorWare™ - toolset by Coventor. A set of sample simulations presented in this paper has been performed for specific simulation domains focused on silicon-alternative material reality to proof the usefulness of proposed substrates. The aim was to verify its applicability for MEMS design and confirm an outstanding performance of the resulting device which effectively opens a new area of interest for subsequent research and development efforts.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1374-1376
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Self Compacting Lightweight Concrete Using Acidic Pumice with Different Powder Materials
Autorzy:
Bozkurt, N.
Taşkin, V.
Powiązania:
https://bibliotekanauki.pl/articles/1031197.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
81.70.Bt
89.20.Kk
Opis:
This paper reports an experimental study on the design of self-compacting lightweight concrete using acidic pumice with different powder materials. For this aim, nine self-compacting lightweight concretes were designed with inclusion of two different fine aggregates and different powder materials. This way, two groups of concrete were designed. First group was composed of single type of aggregate which is acidic pumice from Bitlis Region with barite powder, fly ash powder and pumice powder inclusion, while the second group was generated with river sand as a fine aggregate and acidic pumice from Bitlis Region, as a coarse aggregate with the same powder addition. In the design process, slump-flow, V-funnel and L-box tests were applied to determine the fresh properties of self-compacting lightweight concrete. After the design, test of compressive strength, which is one of the most important parameters of concrete, was applied to all self-compacting lightweight concretes in early age. Moreover, ultrasound pulse velocity test was also performed on all concrete series at the same ages.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 779-782
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deterioration of Mechanical Properties of MBE-Grown, Metastable Semiconductor Layer with Time: the Case of Zinc Blende MnTe
Autorzy:
Adamiak, S.
Dynowska, E.
Dziedzic, A.
Szmuc, K.
Janik, E.
Wiater, M.
Wojtowicz, T.
Szuszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1185914.pdf
Data publikacji:
2016-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
62.20.-x
64.60.My
Opis:
Several few μm thick (001)-oriented, metastable MnTe layers with the zinc blende structure grown onto (001)GaAs substrate by MBE during different periods for the last twenty years were investigated by the scanning electron microscopy, atomic force microscopy, X-ray diffraction, and nanoindentation methods. A partial decomposition of the oldest investigated layers was demonstrated. An important decrease of Young's modulus from about 34 GPa to about 17 GPa, resulting from a deterioration of the crystal structure of such layers, was found.
Źródło:
Acta Physica Polonica A; 2016, 130, 5; 1248-1250
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distinguishing Features of Phase Transformation in the Surface Layer of Hardened Steel with (α+γ)-Two-Phase Structure during Plasto-Elastic Loading at Different Rates
Autorzy:
Alekseeva, L. E.
Sinelnikov, V. A.
Filippov, G. A.
Powiązania:
https://bibliotekanauki.pl/articles/1945237.pdf
Data publikacji:
1996-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
Opis:
An effect of loading during uniaxial tension at different rates ranging from 10$\text{}^{-4}$ to 10$\text{}^{-2}$ s$\text{}^{-1}$ on the phase transformation "austenite-martensite" in the surface layer of hardened 0.36%C-14%Ni steel type with an unbalanced (α+γ)-structure has been determined by an X-ray structure analysis. The mechanisms of (γ-α)-transformation through the depth of steel surface layer and character of this transformation propagation along the specimen length depending on external stress value and tension rate have been defined.
Źródło:
Acta Physica Polonica A; 1996, 89, 3; 353-356
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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