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Tytuł:
Investigation of Radiation Shielding Properties of Soda-Lime-Silica Glasses Doped with Different Food Materials
Autorzy:
Çetin, B.
Yalçin, Ş.
Aktas, B.
Albaşkara, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031927.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.-n
29.40.Mc
Opis:
In this study, radiation shielding properties of soda-lime-silica glasses doped with different food materials such as the egg shell and the peanut shell powders were investigated. Egg shell and peanut shell powders were obtained by grinding of waste shells in an agate mortar. The SLS glass samples with varying egg shell/peanut shell content were produced by melting. The measurements have been performed using the gamma spectrometer, containing a 3" × 3" NaI (Tl) detector, and connected to a full featured 16K channel Multi Channel Analyzer provided by ORTEC/MAESTRO-32 software.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 988-990
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Characterization of High Purity Silica Obtained from Rice Husks
Autorzy:
Şımşek, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1031530.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.-n
81.20.Ka
81.40.-z
Opis:
Although SiO₂ is produced mostly from mineral sources like quartz, it has recently been obtained from lignocellulosic natural resources, such as rice husk (hull). Several methods for extracting silica (SiO₂) from rice husks are available in the literature. These methods are based essentially on heat treatment and/or extraction. This study represents a thorough account of heat treatment and acid-base extraction, to obtain silica from rice husks with a high purity and to eliminate other inorganic impurities. Rice husks, considered to be a potential silica source, were pretreated with various acids, base and water and then thermally degraded in a fixed bed reactor under an inert gas atmosphere (N₂). The materials produced in these conditions were characterized by Brauner-Emmett-Teller analysis, for surface area and pore volume, by Fourier transform infrared spectroscopy, powder X-ray diffraction, X-ray fluorescence, and scanning electron microscopy.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1002-1005
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of natural radioactivity and associated radiological hazard in excavation field in Turkey (Oluz Höyük)
Autorzy:
Çetin, B.
Öner, F.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1070198.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.-n
29.85.Fj
Opis:
The level of natural radioactivity may be varied with the increase in dependence of the depth into the earth. In present study, soil samples from different depths were collected in Oluz Höyük excavation area. The radionuclide concentrations in soil samples were determined by gamma-ray spectrometer which contains 3" × 3" NaI(Tl) detector connected to multichannel analyser. The photopeaks at 1460, 1764, and 2615 keV due to ⁴⁰K, ²²⁶Ra and ²³²Th, respectively, have been used. The obtained activity concentrations of ⁴⁰K, ²²⁶Ra and ²³²Th ranged from 656.03 to 1791.85 Bq/kg, 62.39 to 180.93 Bq/kg and 48.31 to 125.43 Bq/kg, respectively. To assess the radiological hazard of the natural radionuclides content in the soil samples of these area, the radium equivalent activities (the minimum value was 181.99 Bq/kg and the maximum value was 497.97 Bq/kg), the absorbed dose rate (the minimum value was 86.83 nGy/h and the maximum value was 237.22 nGy/h), annual effective dose rate (the minimum value was 0.11 mSv/y and the maximum value was 0.29 mSv/y) and external hazard index (the minimum value was 0.49 and the maximum value was 1.35) were calculated using measured activities.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 475-478
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of seasonal indoor radon concentration in Sakarya University, Turkey
Autorzy:
Zenginerler, Z.
Ertugral, F.
Yakut, H.
Tabar, E.
Demirci, N.
Gunermelikoglu, K.
Powiązania:
https://bibliotekanauki.pl/articles/1065299.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.-n
27.90.+b
Opis:
Indoor radon measurements were performed using LR-115 type-II solid state nuclear track detectors in Sakarya University in classrooms, laboratories and offices during the period from July 2013 to June 2014. The results show that the radon concentration in studied buildings ranges from 0.20±0.04 to 94.1±10 Bq/m³ with an average value of 40±5 Bq/m³. The annual effective doses from radon were estimated to range from 0.18 to 2.00 mSv/y with a mean value of 1.00 mSv/y. These results indicate no radiological health hazard, as the measured activities are well below International Commission on Radiological Protection recommended level of 200 Bq/m³ for indoor radon.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 450-452
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the structure and thermal properties of intermetallics from Fe-Al system
Autorzy:
Śmiglewicz, A.
Rodak, K.
Tomaszewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1112888.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.70.Pg
65.40.De
65.60.+a
07.20.-n
Opis:
Selected alloys from the Fe-Al system are included into a group of materials on a matrix of intermetallic phases, and characteristic properties result from it and they constitute a resultant between properties of superalloys and ceramic materials. These materials are characterized, inter alia, by capacity for operating at elevated temperatures, as well as good strength related properties and resistance to oxidation and corrosion at an increased temperature. In addition, a low cost of alloy components and low density caused by aluminium content are their advantages. The basic reasons limiting application of alloys from Fe-Al system as construction materials are current: their low plasticity at room temperature, propensity for brittle cracking, low resistance at elevated temperature, and insufficient creep resistance. This unfavorable characteristics may be improved by adding to alloys such elements as molybdenum, zirconium, carbon, and boron, reducing the size of grains, increasing their purity, stabilizing the solid solution, and causing changes in phase transition temperatures. These alloys may be successfully manufactured by classic melting accompanied with refinement remelting, and ingot casting. In spite of additions and microadditions, grain refining of the initial structure of ingots manufactured in that way is rarely achieved, mainly because of low castability and high casting contraction. In this work we presented the results of structure analysis and investigations of the dilatometric study alloys on the base Fe-Al system. The alloys were obtained by classic casting technique. The studies were carried out on samples after casting and annealing. The phase transformation and thermal expansion investigations of the alloys from Fe-Al system with concentration of Fe-58Al were presented. The linear thermal expansion α was calculated by standard method. The α coefficient was noticed as a temperature function.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1004-1006
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of selected organic compounds on the corrosion of historical glass based on their state of preservation
Autorzy:
Greiner-Wronowa, E.
Świt, P.
Powiązania:
https://bibliotekanauki.pl/articles/1058515.pdf
Data publikacji:
2016-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.90.+n
61.43.Fs
07.60.Pb
68.37.-d
68.37.Hk
81.70.-q
07.07.Df
07.75.+h
81.40.Np
Opis:
The aim of this study was to investigate the influence of selected organic compounds such as acetic acid and formaldehyde on the historical glass objects of corrosion processes. This is a very important problem for the field of conservation and restoration of glass of art. Glass objects exhibited in museum display cases can be suffered by evaporating organic compounds which undergo to reaction with leached glass elements to create corrosion deposit on their surface. The proposed method called glass sensors has been used to identify results of impact of various external factors on the tested glass. Due to aggressive environment for the objects there created corrosion phenomena. Glass sensor were prepared as reproduced XVIII-cent. materials. The current studies were carried out by modern physico-chemical methods such as optical, metallography, scanning electron microscopy, inductively coupled plasma mass spectrometry and the Fourier transform infrared spectrometry. These techniques allow to determine the composition of the corrosion layers as well as their structure. The issues raised in this work have been studied following an interdisciplinary approach. The information obtained by using different techniques provides a valuable source of knowledge about the chemical reactions taking place on the surface of the glass. The results derived from this work are useful for the design and implementation of exhibition recommendations and better planning of conservation tasks.
Źródło:
Acta Physica Polonica A; 2016, 130, 6; 1406-1414
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of Detection Efficiency for the Gamma Detector using MCNPX
Autorzy:
Akkurt, İ.
Tekin, H.
Mesbahi, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402379.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.10.Rt
29.40.-n
Opis:
Radiation detection has been a main interest for researchers as all kind of produced particles in atomic and subatomic physics based on the measurement systems so-called detector. Detection efficiency is one of the main parameter in detection system besides many other different parameters of the detector. The absolute efficiency of the gamma detector system will be used at Turkish Accelerator and Radiation Laboratory at Ankara (TARLA) is simulated using MCNPX code (version 2.4.0). The MCNP is the general purpose MC code that can be used for neutron, photon, electron or coupled neutron, photon, electron transport. The results have been obtained for NaI(Tl) detector system and compared with the experimental results. A good agreement was found between calculation and experiment.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-332-B-334
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Hot Deformation of CW602N Brass
Autorzy:
Spigarelli, S.
El Mehtedi, M.
Cabibbo, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402139.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
81.05.Bx
81.20.-n
81.40.Lm
Opis:
Alpha brasses (in principle single-phase solid solution alloys containing less than 35% Zn) are usually processed by extrusion, forging or rolling. Although these materials are of widespread use, few detailed studies of the flow behavior of brass at high temperature are available. The hot workability of a CW602N brass (Cu-36.5%Zn-2%Pb) was thus investigated by torsion testing in the temperature range between 550 and 800°C, under equivalent strain rates ranging from 0.01 to 10 $s^{-1}$. The peak flow stress dependence on temperature and strain rate was described by the well-known Garofalo equation, with a stress exponent close to 4 and Q=220 kJ $mol^{-1}$. A considerably larger scatter of the experimental data was observed in the high temperature range. The detailed microstructural analysis of the deformed samples by scanning electron microscopy revealed substantial differences among the samples deformed in the low temperature regime and those torsioned at 750 and 800°C. These differences were analyzed and discussed to rationalize the different mechanical responses observed in the two hot-deformation regimes.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 726-729
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Temperature Field Distribution in Large-Size Paratellurite Crystals Applied in Acousto-Optic Devices
Autorzy:
Tretiakov, S.
Grechishkin, R.
Kolesnikov, A.
Kaplunov, I.
Yushkov, K.
Molchanov, V.
Linde, B.
Powiązania:
https://bibliotekanauki.pl/articles/1383374.pdf
Data publikacji:
2015-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.-a
42.79.-e
65.40.-b
07.20.-n
Opis:
Temporal and spatial distribution of temperature field was studied in operating acousto-optic devices on base of large-size paratellurite crystals. The study was carried out in real time by means of thermal imaging technique. Dynamics of heat release in a hot deflector and a hot tunable filter was examined at different frequencies and driving electric power levels applied to piezoelectric transducers. The study was also based on measurements of standing wave ratio and analysis of the Smith charts.
Źródło:
Acta Physica Polonica A; 2015, 127, 1; 72-74
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Hard Cyclic Viscoplastic Deformation on Phases Chemical Composition and Micromechanical Properties Evolution in Single Crystal Ni-Based Superalloy
Autorzy:
Kommel, L.
Powiązania:
https://bibliotekanauki.pl/articles/1402123.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.70.-q
81.40.Jj
87.15.Vv
89.90.+n
Opis:
The phases chemical composition and micromechanical properties in single crystal of Ni-based superalloy with chemical composition of 12.1 Al, 5.3 Cr, 9.4 Co, 0.8 Nb, 0.9 Ta, 0.7 Mo, 2.5 W, 0.7 Re and Ni-balance (in at.%) were changed during hard cyclic viscoplastic deformation at room temperature. The method we used based on the Bauschinger effect. The changes in the dendritic microstructure and chemical composition were characterized by scanning electron microscopy and energy dispersive spectrometry. The phases micromechanical properties evolution were characterized by nanoindentation. The results show that the cumulative strain or strain energy density increase arouse the interdiffusion of atoms between the different phases and the phases equilibrium in SC was changed. It is established that the interdiffusion rate depends on elements atoms activation energy. The new γ-γ'-eutectic pools were formed in the primary dendrites region (with fine γ/γ'-phase) and as result the length of newly formed dendrites was decreased significantly. The maximal and plastic depth of nanoindentation were measured and the corresponding micromechanical properties of phases calculated.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 681-683
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Spin Pumping on Spin Waves in Antiferromagnetically Exchange-Coupled Double Layers with Surface Anisotropy
Autorzy:
Baláž, P.
Barnaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402556.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Gb
75.76.+j
75.78.-n
Opis:
Spin wave modes in antiferromagnetically exchange-coupled magnetic double layers are analyzed theoretically. The considered structure is assumed to be covered by a nonmagnetic metallic layer. The spin wave frequencies and spin wave life times are determined from the macroscopic description based on the Landau-Lifshitz-Gilbert equation, which includes the torque due to spin pumping to the cap layer.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 150-152
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient Calculation of Low Energy Configurations of Nanoparticle Ensembles for Magnetoresistive Sensor Devices by Means of Stochastic Spin Dynamicsand Monte Carlo Methods
Autorzy:
Teich, L.
Schröder, C.
Müller, C.
Patel, A.
Meyer, J.
Hütten, A.
Powiązania:
https://bibliotekanauki.pl/articles/1385684.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Mg
75.75.Jn
75.78.-n
Opis:
We present results of Monte Carlo and stochastic spin dynamics simulations of a magnetic nanoparticle model system based on experimentally produced samples. Thermodynamic investigations as well as spin dynamics studies show characteristic features, both resembling magnetic dipole glass behaviour. While spin dynamics studies at T=0 yield a multitude of low energy configurations, thermodynamic simulations show a clear transition between a paramagnetic and a frozen magnetic state. Moreover, we demonstrate the application of experimentally inspired demagnetization protocols to compute low energy configurations of the systems under consideration efficiently.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 374-376
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From Light to Heavy Nuclear Systems, Production and Decay of Fragments Studied with Powerful Arrays
Autorzy:
Casini, G.
Morelli, L.
Barlini, S.
Piantelli, S.
D'Agostino, M.
Baiocco, G.
Marchi, T.
Abbondanno, U.
Ademard, G.
Appannababu, S.
Bini, M.
Bonnet, E.
Borderie, B.
Bougault, R.
Bruno, M.
Chbihi, A.
Cinausero, M.
Degerlier, M.
Fabris, D.
Frankland, J.
Gelli, N.
Gramegna, F.
Gruyer, D.
Gulminelli, F.
Kordyasz, A.
Kozik, T.
Kravchuk, V.
Kulig, P.
Le Neindre, N.
Lopez, O.
Maurenzig, P.
Olmi, A.
Pasquali, G.
Pârlog, M.
Poggi, G.
Rivet, M.
Rosato, E.
Sosin, Z.
Spadaccini, G.
Stefanini, A.
Twarog, T.
Valdrè, S.
Vient, E.
Raduta, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402639.pdf
Data publikacji:
2015-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
25.70.Gh
25.70.Pq
25.70.Mn
29.40.-n
Opis:
Reactions between heavy-ions at various energy regimes produce many nuclear fragments which can be populated in highly excited states. The study of these fragments, detected at the end of their particle decay, is important to investigate nuclear forces and structure effects. In recent years there have been many efforts to extend these studies towards the drip-lines, i.e. to systems far from the β-stability valley, by using accelerated radioactive beams. The development of such infrastructures is accompanied by the development of more powerful detectors and associated electronics, capable to identify ions with very different sizes and kinetic energies. Here we give two examples which show how advanced arrays can contribute to the studies on nuclear phenomena. The examples come from the European FAZIA collaboration and from recent campaigns with the GARFIELD apparatus, the latter in operation at the INFN Legnaro Laboratory (Italy) where the SPES RIB facility is under construction.
Źródło:
Acta Physica Polonica A; 2015, 127, 5; 1548-1551
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of Radon Content in the Thermal Waters in Sakarya
Autorzy:
Ertuğral, F.
Yakut, H.
Tabar, E.
Akkaya, R.
Demirci, N.
Zenginerler, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1402001.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.+n
Opis:
The paper presents the results of radon concentration measurements in thermal waters of Kuzuluk and Taraklı (Sakarya, Turkey) and their contribution to annual effective dose exposure. The radon measurements were performed using RAD 7, a solid state α detector, with RAD H₂O accessory. The results show that the radon activities are within the range of 0.19-5.89 Bql¯¹ with an average value of 0.98 Bql¯¹. The associated annual effective doses have been estimated to range from 0.14 to 0.40 μSvy¯¹ for ingestion and from 1.81 to 5.14 μSvy¯¹for inhalation of radon released from the water. These values are significantly lower than the WHO recommended limit of 100 μSvy¯¹
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-251-B-253
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Paradygmaty i trajektorie technologiczne – studium przypadku broni pancernej
Technological Paradigms and Trajectories – Tanks Case Study
Autorzy:
Szost, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/945538.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
evolutionary economics
neo-schumpeterian economics
innovation
technological paradigm
technological trajectory
product life cycle
ekonomia ewolucyjna
ekonomia neo-schumpeterowska
innowacje
paradygmat technologiczny
trajektoria technologiczna
cykl życia produktu
B52
O30
O33
N40
N70
Opis:
This article presents and verifies an idea of technological paradigm and technological trajectory. According to this theory technological progress is not a random process, but its regular and stable course is set by a technological trajectory. This regularity results from the application of similar methods to solve technological problems. The set of these methods is established by existing technological paradigm. The study of the process of changes in tanks technical characteristics confirms the existence of such regularity. Turning points and consecutive phases of progress related to changes in technological paradigm are identified. History of these changes also fits to a classical product life cycle.
W artykule omówiona i zweryfikowana zostaje teoria paradygmatu oraz trajektorii technologicznej, według której rozwój technologii nie jest zjawiskiem losowym, ale charakteryzuje się regularnymi stabilnym przebiegiem wyznaczającym trajektorię technologiczną. Owa regularność wynika ze stosowania podobnych metod rozwiązywania zagadnień technicznych, wyznaczonych przez obowiązujący paradygmat. Przeprowadzona na przykładzie czołgów analiza procesu zmian charakterystyk technicznych potwierdza istnienie takiej regularności. Wskazane zostały punkty zwrotne, rozgraniczające kolejne fazy rozwoju tej technologii, związane ze zmianami paradygmatu technologicznego i odpowiadające klasycznym fazom cyklu życia produktu.
Źródło:
Gospodarka w Praktyce i Teorii; 2015, 4(41)
1429-3730
2450-095X
Pojawia się w:
Gospodarka w Praktyce i Teorii
Dostawca treści:
Biblioteka Nauki
Artykuł
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