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Wyświetlanie 1-15 z 195
Tytuł:
Microstructure and residual stress in AMS 6308 steel after vacuum carburizing and gas quenching
Autorzy:
Dychtoń, K.
Kocurek, P.
Rokicki, P.
Wierzba, B.
Drajewicz, M.
Sieniawski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1155056.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
87.64.-t
83.85.-c
Opis:
In this work, the vacuum carburizing and gas quenching has been done on gears box made of high strength alloy steel AMS 6308 in four different temperatures. The measurements of hardness was done to evaluate the effective case depth for each temperature. The analysis of retained austenite was presented as a factor which can affect values of residual stress. The residual stresses were measured in Protoi XDR portable diffractometer and the analysis was examined to find influence of temperature and carburizing time on the direction and values of residual stresses.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 953-955
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of Machining Parameters in Turning AISI 304L Stainless Steel by the Grey-Based Taguchi Method
Autorzy:
Ay, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030297.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
Opis:
In this study, an experimental optimization of cutting forces and surface roughness in turning of AISI 304L stainless steel using wiper and conventional insert cutting tools with dry cutting conditions are presented. The influences of feed rate, depth of cut, and corner radius on surface roughness, cutting force and surface hardness are examined. In order to optimize the turning process, Grey relational analysis optimization method is used. The optimal machinability conditions of AISI 304L stainless steel with coated carbide insert are successfully determined in this study.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 349-353
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of the Wind Speed and the Material Emplacement on the Output Signal of PZT Piezoelectric Energy Harvester
Autorzy:
Demir, F.
Anutgan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030306.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
Opis:
In this study the electrical signal produced from wind energy through a (Pb_{x}X_{1-x})(Zr_{y}Ti_{z}Y_{1-y-z}) piezoelectric transducer is analyzed. The material is placed onto a metal frame at different positions and voltage outputs of each are compared at different wind flow speeds and load resistance values. The absorption of the wind energy is tested by connecting a polyurethane material in parallel and perpendicular to the wind flow direction. The use of that material with optimum emplacement condition is shown to increase the voltage output by at least two orders of magnitude, where the maximum voltage output obtained is 13 V, and the maximum power is 338 μW.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 362-365
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Force Microscopy of the Ethmoid Bones of Migratory and Non-Migratory Fishes
Autorzy:
Gorobets, S.
Gorobets, O.
Bulaievska, M.
Sharau, I.
Powiązania:
https://bibliotekanauki.pl/articles/1030476.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
Opis:
For a long time it was believed that the biogenic magnetic nanoparticles (BMNs) in the ethmoid bones of fishes and birds are associated with navigation in the geomagnetic field. However, it was proven that BMNs don't affect the ability of migratory birds to orient in the Earth's magnetic field. It is relevant to check the presence of BMNs in organs of migratory and non-migratory fishes. The presence of BMNs was investigated in the samples of ethmoid bones of atlantic salmon, northern pike and silver carp by the method of magnetic force microscopy. As a result, the biological material of ethmoid bones of migratory and non-migratory fishes contain both separate BMNs and their chains, so BMNs in the ethmoid bone of fishes are not related to their ability to migrate in the geomagnetic field.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 734-737
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Severe Plastic Deformation on Wear Properties of Aluminum Matrix Composites
Autorzy:
Karademir, I.
Unal, O.
Ates, S.
Gokce, H.
Gok, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032037.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
Opis:
The influence of severe plastic deformation on wear properties of Al-5wt.%Grp and Al-5wt.%B₄Cp reinforced aluminum matrix composites was studied. Al matrix composites were produced by solid state processing via powder metallurgy route that provides good incorporation and distribution of the reinforcement particles in the matrix. Wear tests were performed by dry sliding using a pin on disk wear tester. Scanning electron microscope was used to examine worn surfaces to study the wear mechanism. Severely deformed specimens exhibited better wear resistance due to the increase of surface hardness of both Al-5wt.%Grp and Al-5wt.%B₄Cp composites. Al-B₄Cp reinforced composite has higher hardness value through the excellent hardness of B₄C particulates. Al-Grp reinforced composites exhibited better wear resistance due to the solid lubricant effect of Gr particulates.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 487-489
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibrating Subsystems of Freight Wagons and Their Beam Models
Autorzy:
Buchacz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1032555.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
Opis:
The application of analysis of transverse vibrating subsystem of complex microelectromechanical systems by means of the exact and approximate methods were the main purposes of work to solve the task of assignment of frequency-modal analysis and characteristics of mechatronic system. The problems concerned of piezoelectricity and electrostriction and classical and nonclassical methods to solve this problem have been used to obtain the dynamical characteristics in the Gliwice Research Centre. Other diverse problems have been modeled by different methods and next they were examined and analysed. Analysing the diagrams of characteristics of confirmed system, it has been determined that in case of approximate method the resonance frequencies cover with those which have been determined with the exact method. However the values of the characteristic in other areas were different. The main aim of this paper is to compare the transients of characteristics of mechanical subsystem of the transverse vibrating discrete - continuous mechatronic system, obtained by the exact and the approximate Galerkin method and to answer the question - if the method can be used to nominate the characteristics of mechatronic systems. The main subject of deliberation was to determine the flexibility of the mechanical system with constant cross-section using the exact and the Galerkin method. The problems presented in this paper, that means the analysis of subsystem of mechatronic and mechanical complex systems, is however the introduction to the synthesis of transverse vibrating mechatronic systems with assumed frequency spectrum.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 62-63
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In Situ Solution Process for Fabricating Thermally and Mechanically Stable Highly Conductive ZnO-CNT Fiber Composites
Autorzy:
Hossain, M.
Son, S.
Hahn, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033363.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
Opis:
A simple in situ solution process was developed to produce a mechanically and thermally stable ZnO-carbon nanotube fiber composite. ZnO nanoparticles were homogeneously deposited onto the surfaces of and interstices within CNT fibers (between individual CNTs). X-ray photoelectron spectroscopy and Raman analysis revealed that ZnO nanoparticles contained oxygen vacancy defects and CNT fibers included oxygen containing functional group that strongly interacted with Zn. The strong interaction enhanced the mechanical properties of the composite fibers. The Young modulus (20 GPa) and tensile strength (118 MPa) were enhanced compared to the corresponding values of the pristine CNT fibers. The thermal stability was high up to 880°C and light absorption was enhanced across the UV to near IR region in a ZnO-CNT fiber composite. The electrical conductivity of the composite was high up to 954 S/cm despite semiconductor deposition.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 124-132
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of the in-Situ Si₃N₄-SiC Composite Nano Powders by Carbothermal Reduction
Autorzy:
Çalişkan, F.
Kocaman, E.
Cömert, S.
Powiązania:
https://bibliotekanauki.pl/articles/1033686.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
Opis:
Si₃N₄-SiC micro-nano composite powder has been studied by a group of authors during the last decade. Previous works have shown that SiC-Si₃N₄ ceramics exhibits good mechanical properties and high corrosion resistance at elevated temperatures. In this study, we have tried a new approach to obtaining SiC-Si₃N₄ ceramic composite powder by changing the conditions in the carbothermal reduction process. Starting powders were quartz mineral, received from Ege-Sil Co., as silicon-source and, carbon, as silica-reducing and carburizing agent. These powders were ground in the ring mill, separately and together. Carbothermal reduction-nitridation/carburization reactions were carried out in a tube furnace at >1400°C for 4 hours under N₂ and Ar gas, used as nitriding and shielding atmosphere. The synthesized powders were characterized by X-ray diffraction, SEM, and EDS. Results have shown that production of Si₃N₄-SiC micro-nano composite powder was achieved in the modified nitrogen and argon atmosphere above 1400°C. Determination of the Si₃N₄/SiC ratio was possible with sensitive control of the system conditions.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 601-604
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on Effects of Schiff Base Complex to Hydroxyapatite Bioceramics
Autorzy:
Çalışkan, F.
Tuna, M.
Akça, S.
Powiązania:
https://bibliotekanauki.pl/articles/1401434.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
Opis:
The aim of this study was to evaluate the effects of Schiff base metal complex on the bio-compatible hydroxyapatite (HAp) ceramics. The reason for that was to produce, as the final product, the HAp in powder form, with extraordinary features like analgesic, antibacterial properties. This effect was provided by doping HAp powder with some Schiff base complexes during the powder extraction process. Schiff base complex used in the study was synthesized by condensation of primary amines with carbonyl compounds. The chemical structures of the synthesized compounds were confirmed by means of infrared (IR) spectroscopy and elemental analysis. Characterizations of the extracted HAp powders were carried out by using scanning electron microscopy for surface analysis and EDS analysis, X-ray diffraction for phase determination and grain size distribution. The bactericide effects of Zn SAE-added pure HAp were tested on E.Coli bacteria for the content range of 0-7 wt.% of Zn-SAE. Consequently, bacterial activity of the calcium phosphate resulting powders was evolved by adding the Zn SAE Schiff base complex.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1393-1396
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of Acupunctural Points as Diagnostic Method
Autorzy:
Jovanić, B.
Nikolovski, D.
Radenković, B.
Despotović, M.
Powiązania:
https://bibliotekanauki.pl/articles/1795707.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.-t
Opis:
The goal of this work was to establish a connection between the optical parameters of the skin in which the acupuncture points have been settled and the pathological state of the organism. For the first time a connection between the optical characteristics of the specific skin parts (acupuncture points) and the state of the organism has been demonstrated. The optical parameter of the acupuncture point optical parameter (on surface of the reflectance curve between 470 nm and 660 nm) conduct in accordance with the traditional Chinese medicine theories (balance disturbance within the organism, time change). Acquired results point to the possibility of using acupuncture point optical parameter measuring as a method to determine the number of therapeutical treatments during the traditional Chinese medical treatments.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 693-696
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of X-Ray Total Attenuation Coefficient in Zr, Ag, In for Energy Range Between 10.5-111.9 keV
Autorzy:
Turgut, Ü.
Büyükkasap, E.
Şimşek, Ö.
Ertuğrul, M.
Doğan, O.
Powiązania:
https://bibliotekanauki.pl/articles/1968894.pdf
Data publikacji:
1998-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
Opis:
The total X-ray attenuation coefficients in elements Zr, Ag, and In for K$\text{}_{α}$ and K$\text{}_{β}$ characteristic lines of elements with different Z (33 ≤ Z ≤ 92) were estimated by measuring attenuation in transmission method. The intensity of K X-rays was monitored by a Ge(Li) detector with energy resolution 190 eV at 5.9 keV. The experimentally measured attenuation coefficients were found in good agreement with the theoretical values of attenuation coefficients calculated by Storm, Israel and Hubbell, Seltzer.
Źródło:
Acta Physica Polonica A; 1998, 93, 5-6; 693-700
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultra-High Resolution Atomic and Molecular Spectroscopy at the Advanced Light Source
Autorzy:
Schlachter, F.
Bozek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1963298.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
Opis:
Ultra-bright ultraviolet and soft X-ray beams produced at the Advanced Light Source are achieving world records in spectroscopic resolution. High-resolution spectroscopy in the 20 to 300 eV photon energy range has been applied to photoionization yield and photoemission measurements in atoms and molecules to reveal previously unseen resonance series in doubly-excited autoionizing states of helium, to analyze angular distributions in photoemission from doubly-excited states of helium and other rare gases, to reveal vibrational and ligand-field splitting of small molecules through photoionization, and, to examine photoemission from doubly- and triply-excited hollow lithium atomic states.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 623-629
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optics of Zero Dimensional Semiconductor Systems
Autorzy:
Ekimov, A. I.
Efros, Al. L.
Powiązania:
https://bibliotekanauki.pl/articles/1877306.pdf
Data publikacji:
1991-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.90.+t
Opis:
The optical spectra of semiconductor microcrystals grown in transparent matrix of oxide glass are investigated. The size of microcrystals was varied in a controlled manner from a few tens to a few hundreds of angstroms. The microcrystal embedded in wide gap matrix represents three-dimensional potential well for electrons, holes and excitons. The optical properties of such zero-dimensional semiconductor structures are shown to be governed by the structure of energy spectra of confined electron-hole pairs. The phenomenon of the microcrystals ionization at interband optical excitation is observed. The Auger process in microcrystals containing two nonequilibrium electron-hole pairs is proposed to be responsible for this effect. The experimental dependencies of the ionization rate as a function of excitation intensity and the microcrystal size are in a good agreement with the theoretical predictions of the Auger recombiantion model.
Źródło:
Acta Physica Polonica A; 1991, 79, 1; 5-14
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probabilistic Analysis of Site-Occupation Preferences in Ga$\text{}_{x}$In$\text{}_{1-x}$As$\text{}_{y}$Sb$\text{}_{1-y}$ and Cd$\text{}_{1-x}$Mn$\text{}_{x}$Se$\text{}_{y}$Te$\text{}_{1-y}$ Quaternary Compounds
Autorzy:
Robouch, B.
Kisiel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1992071.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.90.+t
Opis:
Site-occupation preferences in quaternary GaInAsSb and CdMnSeTe compounds in tetrahedrally coordinated zinc-blende structures are discussed. Probabilistic eigenfunctions are defined to determine individual component pair-populations from measured average-pair distributions. The methodology and possible traps in interpreting site-occupation preferences of published EXAFS experimental overall average-pair distributions are discussed. The approach allows a deeper understanding of individual pair selective preferences in semiconducting multinary compounds. EXAFS reported departures from Bernoulli random distributions point to changes within elemental tetrahedral average-populations. Resolution requires that for tetrahedral structures experimental data best-fit be a 4th degree polynomial, product of a parabola by the factor x(1-x). The analysis shows that both materials have a marked preference for elemental tetrahedra with odd numbers of competing species of ions around a central ion.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 497-502
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Grey-Based Taguchi Method: Optimisation of Drilling of Hybrid Aluminum Matrix Composites
Autorzy:
Ay, M.
Altunpak, Y.
Hartomacioğlu, S.
Powiązania:
https://bibliotekanauki.pl/articles/1032046.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
Opis:
The aim of this study was to investigate the influence of cutting parameters and effect of graphite rate on cutting force and surface roughness in drilling of Al/20%SiC/5%Gr, Al/20%SiC/7.5%Gr and Al /20%SiC/10%Gr hybrid composites, fabricated by vortex method. The drilling tests are conducted with diamond-like-carbon coated cutting tools. The Grey relational analysis based Taguchi optimization method was selected to determine the optimum cutting conditions. The results show that the spindle speed (4500 rpm), the rate of graphite (10%) and feed (0.1 mm/rev) were found to be significant parameters for surface roughness and cutting force. The predicted values from the developed model and experimental values are found to be very similar in this study.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 551-554
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 195

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