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Wyświetlanie 1-15 z 26
Tytuł:
Nanomechanical properties of different dental restorative materials
Autorzy:
Altan, H.
Bilgic, F.
Arslanoglu, Z.
Kale, E.
Köroğlu Kale, A.
Altan, A.
Sahin, O.
Powiązania:
https://bibliotekanauki.pl/articles/1068227.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
62.20.Qp
Opis:
The aim of this study is to determine the hardness and roughness of glass ionomer cement, glass carbomer, and compomer by nanoindentation. Three different dental restorative materials: glass ionomer cement, glass carbomer cement, and compomer were used. Disc specimens (10 mm × 1 mm) were prepared from each material using teflon mold. All specimens were light cured according to the manufacturer's instructions. The specimens were then mounted in polyacrilic resin. After grinding and polishing the specimens were stored in distilled water at 37°C for 1 day. The specimens were investigated using nanoindenter. The highest nanohardness was measured for glass ionomer cement and the lowest for glass carbomer. Regarding roughness, glass ionomer cement and compomer showed the highest mean values. Glass ionomer cement and compomer exhibited similar nanomechanical properties. Glass carbomer had superior ability to be polished up.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 394-396
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influences of Particle Impingement Angle and Velocity on Surface Roughness, Erosion Rate, and 3D Surface Morphology of Solid Particle Eroded Ti6Al4V Alloy
Autorzy:
Avcu, E.
Yıldıran, Y.
Şahin, A.
Fidan, S.
Sınmazçelik, T.
Powiązania:
https://bibliotekanauki.pl/articles/1194513.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.70.-q
68.35.B-
68.35.-p
42.79.Ls
Opis:
In this study, it is aimed to investigate the effects of particle impingement angle and velocity on the surface roughness, erosion rate, and surface morphology of solid particle eroded Ti6Al4V alloy. Ti6Al4V samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45°, 60°, 75° and 90°) and impingement velocities (33 m/s, 50 m/s, and 75 m/s) by using 120 mesh garnet erodent particles. Subsequently, erosion rates and surface roughness values of samples were analyzed and calculated as a function of particle impingement angle and velocity. Moreover, 3D surface morphologies of the eroded samples were prepared by using high definition scanner and image processing programs. Results show that erosion rates, surface roughness values and surface morphologies of Ti6Al4V alloy have been varied significantly depending on the both particle impingement angle and velocity. Erosion rates of Ti6Al4V alloy were decreased with increases in particle impingement angle; on the other hand, the surface roughness values were increased with increases in particle impingement angle. Both erosion rates and surface roughness values were increased with increases in particle impingement velocity. Finally, the surface morphologies of the eroded samples were evaluated deeply. It is concluded that the surface morphology variation of the Ti6Al4V alloy depending on the particle impingement angle and velocity were well correlated with the erosion rates and the surface roughness values.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 541-543
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation Shielding Properties of Spark Plasma Sintered Boron Carbide-Aluminium Composites
Autorzy:
Buyuk, B.
Tugrul, A.
Cengiz, M.
Yucel, O.
Goller, G.
Sahin, F.
Powiązania:
https://bibliotekanauki.pl/articles/1401941.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
25.20.Dc
81.05.Je
Opis:
In this study gamma and neutron attenuation properties of boron carbide-aluminium (B₄C-Al) composites were investigated. B₄C-Al composites were produced by spark plasma sintering method. Aluminum percentages in the B₄C-Al composites were 0%, 10%, 15%, and 20% by volume. The composite materials were performed against gamma and neutron sources. Cs-137 and Co-60 gamma radioisotopes were used as gamma sources and Pu-Be neutron howitzer was used for neutron source. Theoretical mass attenuation coefficients were determined by using XCOM computer code and compared with the experimental results. It has been seen that the experimental results were close to the theoretical results. Total macroscopic cross-sections of the samples were determined for Pu-Be neutrons. It is concluded that increasing aluminum ratio in the B₄C-Al composites causes higher gamma attenuation behavior for Cs-137 and Co-60 gamma sources and the total macroscopic cross-sections of the B₄C-Al composites decrease by increasing Al concentration.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-132-B-134
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Properties of Boronized AISI 316, AISI 1040, AISI 1045 and AISI 4140 Steels
Autorzy:
Calik, A.
Sahin, O.
Ucar, N.
Powiązania:
https://bibliotekanauki.pl/articles/1808113.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.-x
62.20.Qp
68.35.Fx
Opis:
In this study, some mechanical properties of borided and unborided four steels were investigated. Boronizing of steels was performed by powder pack method at 1210 K for 4 h. The hardness of borides, boride layer thickness and room temperature tensile properties were measured and it was observed that hardness and tensile properties strongly depend on chemical composition of steels. In addition, the effect of a notch on impact behavior was examined by conducting the Charpy tests on borided and unborided steels. The greatest notch toughness was found for a steel AISI 316 with a microstructure consisting of different C, Ni and Cr chemical composition compared to AISI 1040, 1045 and 4140 steels.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 694-698
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processing, Mechanical and Nuclear Characterization of Boron Carbide Ceramics Consolidated by Spark Plasma Sintering
Autorzy:
Cengiz, M.
Ozer, S.
Buyuk, B.
Tugrul, A.
Yucel, O.
Goller, G.
Sahin, F.
Powiązania:
https://bibliotekanauki.pl/articles/1401969.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
25.20.Dc
81.20.Ev
Opis:
Boron carbide (B₄C) ceramics were produced by spark plasma sintering technique with 5, 10, 15, and 20 vol.% aluminum (Al) in order to improve sintering behaviours of B₄C ceramics. B₄C ceramics were produced, having square cross-section and 50 × 50 × 5 mm³ dimensions. The sintering process was carried out at different temperatures by applying 40 MPa of pressure with 100°C/min under vacuum. The effects of various amounts of Al additive and sintering temperature on density, vickers hardness, fracture toughness and microstructure were examined. The hardness and fracture toughness of the samples were evaluated by the Vickers indentation technique. Microstructures of the samples were characterized by scanning electron microscopy technique. Fast neutron attenuation properties of the ceramics having highest density were also investigated.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-187-B-189
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Terpolymer Addition on the Thermal and Termomechanical Properties of Poly(Phenylene Sulfide)
Autorzy:
Cetin, B.
Sahin, A.
Yilmaz, T.
Sinmazcelik, T.
Curgul, I.
Powiązania:
https://bibliotekanauki.pl/articles/1033681.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.70.Pg
83.85.Vb
61.41.+e
Opis:
Poly(phenylene sulfide) (PPS) is one of the high-performance engineering polymers and it exhibits superior behavior, such as electrical insulation, dimensional and thermal stability, chemical resistance for various industrial applications. In addition to this, PPS has a high degree of crystallinity and it maintains these properties at high temperatures. These advantageous properties of PPS can be dependent on its chemical structure, composed of phenyl groups linked by a sulfur atom, which gives rigidity to the polymer chains. Owing to these properties, PPS is widely used in electrical and electronic components, automobile industry and mechanical applications. On the other hand, brittleness of PPS restricts its further applications. For this reason, ethylene-acrylic ester-glycidyl methacrylate terpolymer (Lotader®-AX8900) was used to overcome the brittleness of PPS. The effects of terpolymer addition on the thermal and thermomechanical properties of blends were investigated in this study. PPS/Lotader (0, 2, 5, 10 wt.% Lotader®) blends of various compositions were prepared. The blends were prepared by using laboratory scale micro compounder and injection molding machine. Thermomechanical and thermal properties of blends were investigated by means of dynamic mechanic analysis and differential scanning calorimeter test methods. As a result of this study, it was found that increasing loading level of Lotader® significantly decreased the crystallinity and increased glass transition temperature of PPS. On the other hand, Lotader® addition did not affect the melting temperature of PPS considerably. Results of dynamic mechanic analysis test revealed that while damping factor peak and loss modulus values of blends increased with the addition of Lotader®, storage modulus of blends decreased with the increasing loading level of Lotader®. When all test results are considered, it can be concluded that Lotader addition changes the brittle nature of PPS to ductile nature. In addition to this, 2 wt.% Lotader addition to PPS enables the optimum ductility for PPS without deteriorating its other properties.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 598-600
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of the Toughness and Crack Propagation Resistance Properties of Poly(Phenylene Sulfide)
Autorzy:
Cetin, B.
Sahin, A.
Karsli, N.
Yilmaz, T.
Sinmazcelik, T.
Curgul, I.
Powiązania:
https://bibliotekanauki.pl/articles/1398748.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Qk
62.25.Mn
62.20.mm
Opis:
Poly(phenylene sulfide) (PPS) is a high-performance thermoplastic engineering polymer, which exhibits outstanding properties such as electrical insulation, dimensional and thermal stability, chemical resistance, etc. In addition to this, PPS has a high degree of crystallinity and it exhibits good physical properties at elevated temperatures. Owing to these properties, PPS is widely used in electrical and electronic components, automobile industry and mechanical applications. These outstanding properties of PPS can be attributed to its chemical structure, composed of phenyl groups linked by a sulfur atom, which gives rigidity to the chain. On the other hand, the brittleness with low elongation strain, toughness and crack propagation resistance also restricts its further applications. Several methods are used to overcome these undesirable properties of PPS. Blending of PPS with other polymers is one of these methods. In this study, Ethylene-Acrylic Ester-Glycidyl Methacrylate terpolymer (Lotader®-AX8900) was used to improve the toughness and crack propagation resistance properties of PPS. For this purpose, PPS/Lotader (0, 2, 5, 10 wt.% Lotader) blends were prepared at various compositions. The blends were manufactured using laboratory scale twin screw extruder and injection molding machine. Mechanical properties of blends were investigated by using tensile test method. In addition to this, crack propagation and toughness of samples were investigated by using essential work of fracture (EWF) method. As a result of this study, it was found that Lotader addition significantly increases the toughness and crack propagation resistance of PPS.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 683-686
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of some growing media on the growth of strawberry cvs. 'Camarosa' and 'Fern'
Autorzy:
Ercisli, S
Sahin, U.
Esitken, A.
Anapali, O.
Powiązania:
https://bibliotekanauki.pl/articles/28091.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Fern cultivar
strawberry cultivar
plant growth
strawberry
plant cultivation
growing medium
Camarosa cultivar
Opis:
This study evaluated the development of above and under ground parts of strawberry plants cvs. 'Fern' and 'Camarosa1 in a glasshouse using perlite, forest soil, finpeat, peat, finpeat+perlite (1:1) and peat+perlite (1:1) as substrates. The effects of different growing media on development of above and under ground parts of plant were statistically significant. The highest number of primary roots per plant, length of the most developed roots and number of crowns per runner were obtained from perlite, finpeat+perlite and peat medium, respectively, in both cultivars. The runner length, number of runners per plant, leaf area, fresh root weight and dry root weight varied between cultivars according to growth medium. In general peat, finpeat or finpeat+perlite gave the best results in terms of above and under ground parts of plants in both cultivars. Some important properties such as water retention capacity, cation exchangeable capacity, pH, porosity etc. of growing media using in this study were also determined.
Źródło:
Acta Agrobotanica; 2005, 58, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Presence of Metals and Antibiotics Resistant Bacteria in Arable Manure Soils
Autorzy:
Erdem, B.
Dayangaç, A.
Şahin, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1031124.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
heavy metals
antibiotics
resistance
manure soils
Opis:
Heavy metals and antibiotics resistance are intense public interest owing to their pollution in the environment and potential deleterious effects on human health. A total of 15 isolates of Bacillus subtilis, Bacillus cereus, Pseudomonas aeruginosa and Escherichia coli (50 manure garden soils) were tested for their resistance against certain heavy metals and antibiotics. Minimum inhibitory concentrations of Pb²⁺, Co²⁺, Cu²⁺, and Zn²⁺ for each isolate were also determined. B. subtilis, B. cereus, P. aeruginosa and E. coli exhibited high tolerance to minimum inhibitory concentrations of 3,200 μg/ml for Pb²⁺, 400 μg/ml for Cu²⁺ and Co²⁺, and 100 μg/ml for Zn²⁺ in agar plates. All the isolates were highly resistant to lead and they showed 100% growth in 3,200 μg/ml concentration. It was observed that all isolates were resistant to a wide range of antibiotics namely clindamycin, ceftazidime, aztreonam and vancomycin.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 570-571
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Molding Method and Enhanced Cell Homogeneity in the Powder Metallurgical Route for Production of Closed Cell Al-Foam
Autorzy:
Erturk, A.
Sahin, T.
Powiązania:
https://bibliotekanauki.pl/articles/1033369.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Rm
82.33.Ln
61.43.Gt
61.05.cp
68.37.Hk
Opis:
TiH₂ content, mixing, pressing, different mold filling rate as the factors which affect foaming process on the powder metallurgical route were investigated. TiH₂ was added in the amount of 0.5-1-1.5-2 wt% to adjust the proper amount. Differential scanning calorimetry tests were conducted on the TiH₂ powders in order to obtain optimum hydrogen releasing condition. Aluminum and TiH₂ powders were blended with the different speed-time combination. The mix was compacted at different pressures with the aim of explaining of the oxide layer deformation. An acceptance-rejection criterion was developed and used in pore analysis. Also, the using of a borosilicate glass molding technique are completely original and a new approach.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 39-42
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Waste Toothbrush Fiber on Strength and Freezing–Thawing Behavior in High Plasticity Clay
Autorzy:
Isik, Fatih
Akbulut, R. Kagan
Zaimoglu, A. Sahin
Powiązania:
https://bibliotekanauki.pl/articles/1845156.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
waste material
polypropylene fiber
toothbrush bristle
freezing–thawing
unconfined compression test
reinforced clay
Opis:
The use of waste materials in civil engineering applications has gained importance nowadays. Consuming limited natural resources and increasing waste disposal costs have led researchers to evaluate waste materials for different geotechnical applications. In this respect, some waste materials are used as reinforcement in soils to improve their engineering properties. The main objective of this paper was to investigate the usability of waste polypropylene fiber as a reinforcement material in high plasticity fine-grained soils. For this purpose, waste toothbrush bristle (WTB) was used as a polypropylene fiber reinforcement material and added to fine-grained soil at ratios of 0.2%, 0.4%, 0.6% and 0.8% by dry total weight. The effect of WTB on freezing–thawing behavior and unconfined compression strength of unreinforced and reinforced clayey soil was evaluated. The results indicated that addition of WTB to high plasticity clay improved its behavior against freezing–thawing. Also, undrained shear strength increases with respect to increment in WTB ratio.
Źródło:
Studia Geotechnica et Mechanica; 2021, 43, 1; 15--21
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical Effects on the K$\text{}_{β}$/K$\text{}_{α}$ Intensity Ratios in First-Row Transition Element Compounds
Autorzy:
Küçükönder, A.
Büyükkasap, E.
Yilmaz, R.
Şahin, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1994736.pdf
Data publikacji:
1999-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.-g
82.80.-d
Opis:
Chemical Effects on the K$\text{}_{β}$/K$\text{}_{α}$ X-ray Intensity Ratios for Some First-row Transition Element Compounds Were Studied Experimentally and Calculated. the Vacancies in the K Shell Were Created by 59.5 keV γ rays from an $\text{}^{241}$Am Radioactive Source and Characteristic X-ray Radiation from Sample Was Measured by Using Si(li) and Ge(li) Detectors. the Calculations Were Carried Out Using Brunner's Model. the Calculated Relative K$\text{}_{β}$/K$\text{}_{α}$ X-ray Intensity Ratios Are in Good Agreement with the Present and the Previously Published Experimental Data.
Źródło:
Acta Physica Polonica A; 1999, 95, 2; 243-250
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of different pruning treatments on the growth, fruit quality and yield of 'Hacihaliloglu' apricot
Wpływ różnych zabiegów cięcia na wzrost, jakość i plon owoców moreli ‘Hacihaliloglu’
Autorzy:
Naim Demirtas, M.
Bolat, I.
Ercisli, S.
Ikinci, A.
Olmez, H.A.
Sahin, M.
Altindag, M.
Celik, B.
Powiązania:
https://bibliotekanauki.pl/articles/11541916.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
pruning treatment
plant cultivar
plant growth
fruit quality
fruit yield
Hacihaliloglu cultivar
apricot
Prunus armeniaca
summer pruning
winter pruning
pomology
Turkey
Opis:
This study was conducted in Malatya, between 1999 and 2003, and the region's most important dried apricot variety, Hacihaliloglu was used as material. In the study, the effect of 5 different combined or alone pruning treatments on the growth, fruit quality and yield characteristics were determined in comparison with non-pruned trees. Pruning treatments in different periods did not statistically affect phenological features and fruit dimensions but strongly affected total soluble solid and fruit firmness of Hacihaliloglu apricot cultivar. The highest average yield considering trunk cross-sectional area was obtained as 0.34 kg·cm-2 from pre-harvest summer pruning treatment and the highest share of flower bud was observed as 68.29% in pre-harvest summer+winter pruning treatment. Pruning applications significantly affected both shoot diameter and length. The highest shoot diameter and length were obtained from pre-harvest summer+winter pruning application as 8.52 mm and 77.84 cm, respectively. The highest leaf area was determined as 39.43 cm2 in post harvest pruning treatment.
Badanie przeprowadzono w miejscowości Malatya w latach 1999–2003 na najważniejszej w regionie odmianie moreli do suszenia, Hacihaliloglu. W badaniu określono wpływ 5 różnych zabiegów cięcia na wzrost, jakość owoców oraz plonowanie w porównaniu z drzewami nieprzycinanymi. Zabiegi cięcia w różnych okresach nie wpłynęły w sposób istotny na cechy fenologiczne ani rozmiary owoców, natomiast wywarły silny wpływ na zawartość ekstraktu w soku oraz jędrność owoców moreli odmiany Hacihaliloglu. Najwyższy średni plon, 0,34 kg·cm-2 przy uwzględnieniu powierzchni przekroju poprzecznego pnia osiągnięto przy letnim przycinaniu po zbiorze owoców, a największy udział pąków – 68,29%, – zaobserwowano przy przedzbiorczym zabiegu cięcia lato+zima. Zastosowanie cięcia istotnie wpłynęło zarówno na średnicę pędów jak i ich długość. Największą średnicę i długość pędów, odpowiednio 8,52 mm i 77,84 cm, otrzymano stosując przedzbiorcze cięcie lato+zima. Największą powierzchnię liścia, 39,43 cm2 uzyskano przy pozbiorczym zabiegu cięcia.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2010, 09, 4; 183-192
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical and Thermal Properties of Pumice Powder Filled PPS Composites
Autorzy:
Sahin, A.
Yildiran, Y.
Avcu, E.
Fidan, S.
Sinmazcelik, T.
Powiązania:
https://bibliotekanauki.pl/articles/1182862.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Qk
81.70.Bt
81.70.Pg
Opis:
Recently, it is common application to use particle materials as fillers to improve engineering properties and lower the cost of finished product. Pumice powder is cheaper than most of traditional particle fillers, however use of pumice powders as a reinforcing material in composites has not been studied in literature. Hence, in this study we have investigated the mechanical and the thermal properties of pumice powder filled polyphenylenesulphide (PPS) composites. PPS composites were reinforced with pumice powder at different loading rates (0, 1, 3.5, and 10 wt%) and they were manufactured by twin screw extruder and injection molding machine. Thermal properties were investigated by thermogravimetric analysis and differential scanning calorimeter methods. Moreover, mechanical properties such as barcol hardness, tensile strength, and modulus of samples were investigated. Thermal properties of composite samples have varied significantly depending on the loading rate. Also mechanical properties of pumice powder filled PPS composites have showed better results than pure PPS. According to test results both of mechanical and thermal properties of composites have improved with pumice powder reinforcement and it is determined that pumice powders can be used instead of traditional particle fillers.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 518-520
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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