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Wyświetlanie 1-15 z 21
Tytuł:
Using of boron waste as a shielding material on landmine detection with NBS imaging technique
Autorzy:
Baysoy, D.
Powiązania:
https://bibliotekanauki.pl/articles/1061969.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.20.Cz
28.20.Gd
28.20.Pr
Opis:
Boron wastes are produced as a result of production route of boron products and these wastes still contain a small amount of boron. In order to understand the possible use of boron waste in non-metallic landmine detection as a shielding, Monte Carlo simulations were applied by neutron backscattering imaging technique using two different neutron sources of ²⁵²Cf and deuterium-deuterium (D-D) reaction. NBS imaging detector system consists of a group of thermal neutron ³He detectors. To investigate the performance of the landmine detection system, a suitable shield around the neutron source was designed and this system was tested for localisation of buried landmine.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 569-571
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the Effects of Boron Carbide Particle Size on Radiation Shielding Properties of Boron Carbide-Titanium Diboride Composites
Autorzy:
Buyuk, B.
Tugrul, A.
Aktop, S.
Addemir, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399664.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
25.20.Dc
Opis:
Boron carbide is a material which has wide application areas in industry including nuclear technology. Titanium diboride-boron carbide composites which were produced from different boron carbide particle sizes were studied for searching of the behaviour against the gamma ray. Micron size and submicron size boron carbide were used to produce composite materials. The volume of boron carbide and titanium diboride in the composites are 85% and 15%, respectively. For the investigation of the gamma radiation behaviour of these materials, Cs-137 radioisotope was used as gamma source in the experiments which has a single gamma-peak at 0.662 MeV. Gamma transmission technique was used for the measurements. The effects of boron carbide particle size on radiation attenuation of titanium diboride-boron carbide composites were evaluated in relation with gamma transmission and the results of the experiments were interpreted and compared with each other. It could be understood that decrease of particle size of boron carbide in boron carbide-titanium diboride composites causes higher linear and mass attenuation coefficient values. So, submicron size boron carbide used composite materials are more convenient than micron size boron carbide used composite materials as radiation shielding materials for nuclear applications.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 177-179
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Behaviour of Titanium Diboride Reinforced Boron Carbide-Silicon Carbide Composites against Cs-137 Gamma Radioisotope Source by Using Gamma Transmission Technique
Autorzy:
Buyuk, B.
Tugrul, A.
Akarsu, A.
Addemir, A.
Powiązania:
https://bibliotekanauki.pl/articles/1490933.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
25.20.Dc
Opis:
Boron carbide is a material which has wide application areas in industry including nuclear technology. Titanium diboride reinforced boron carbide-silicon carbide composites were studied for searching of the behaviour against the gamma ray. It has been adopted that depending on their properties such improved materials can be used in nuclear technology. For the investigation of the gamma radiation behaviour of these materials, Cs-137 radioisotope was used as gamma source in the experiments which have a single gamma-peak at 0.662 MeV. Gamma transmission technique was used for the measurements. Different reinforcing ratios, titanium diboride reinforced boron carbide-silicon carbide composites were evaluated in relation to gamma transmission and the results of the experiments were interpreted and compared with each other. It could be understood that the increasing ratio of titanium diboride in boron carbide-silicon carbide composites causes higher hardness, strength and linear attenuation coefficient values but decrease the mass attenuation coefficient.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 135-137
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Density of States in Thin Boron-Doped Microcrystalline Silicon Films Estimated from the Thermally Stimulated Conductivity Method
Autorzy:
Dussan, A.
Schmidt, J.
Koropecki, R.
Powiązania:
https://bibliotekanauki.pl/articles/1207505.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
73.61.Ga
61.72.uf
Opis:
In this work, a series of boron-doped microcrystalline silicon samples [μc-Si:H(B)] were deposited by plasma-enhanced chemical vapor deposition, using silane $(SiH_4)$ diluted in hydrogen, and diborane $(B_2H_6)$ as a dopant gas. The concentration of $B_2H_6$ in $SiH_4$ was varied in the range of 0-100 ppm. The density of states was obtained from the thermally stimulated conductivity technique and compared with results obtained by the modulated photoconductivity methods. To explain the poor agreement between the density of states obtained from the thermally stimulated conductivity and the other methods, it is shown by means of numerical simulations that the density of states is very sensitive to experimental errors introduced in the calculation of the $μ_{n}τ_{n}$ product (mobility of electron × lifetime of the electron). The thermally stimulated conductivity method is applied here for the first time to calculate the density of defect states in the forbidden band of μc-Si:H samples.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 174-176
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation Shielding Effect of Boron Carbide Aluminum Metal Matrix Composite
Autorzy:
Akkaş, A.
Tugrul, A.
Addemir, O.
Marşoğlu, M.
Ağacan, B.
Büyük, B.
Powiązania:
https://bibliotekanauki.pl/articles/1401221.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
25.20.Dc
Opis:
Boralyn (Al/B₄C) composite material is produced chiefly of boron carbide and aluminum. Boron Carbide is an important material for the nuclear industry due to high neutron absorption cross-section. This composite is used as shielding materials to absorb neutrons in the nuclear reactors and control road materials. In this study we investigated Al/B₄C composites against gamma radiation. For that purpose, 5 wt.%, 10 wt.%, 15 wt.% and 20 wt.% reinforcement content were investigated. Cs-137 gamma radioisotope source which has 662 keV gamma energy photons were used. For each material, linear and mass attenuation coefficients were calculated. Theoretical mass attenuation coefficients were calculated from XCOM computer code. The theoretical results were compared with experimental results. The results were showed that increasing the amount of Boron Carbide compound content of boralyn composite material decrease the linear and mass attenuation coefficient of materials
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 947-949
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of Boron-Carbide as Radiation Shielding
Autorzy:
Kara, Ü.
Tekin, H.
Calik, A.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1402380.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.58.Ji
87.57.U-
Opis:
Radiation is widely used many fields, especially in medical science. The shielding is the basic method of protection against unnecessary influence of radiation. One of the tools most commonly used in nuclear medicine is vial pig container. Usually lead is used as shielding material in vial pigs to cover radiation source, such as $Tc^{99m}$ which is the most widely used radiopharmaceutical in nuclear medicine. In this study boron carbide has been tested as an substitute of lead in vial pig. The measurement has been performed with the Geiger-Müller counter and the personal combined radiation detectors.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-335-B-336
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shielding Effect of Boron Carbide Aluminium Metal Matrix Composite against Gamma and Neutron Radiation
Autorzy:
Akkas, A.
Tugrul, A.
Buyuk, B.
Addemir, A.
Marsoglu, M.
Agacan, B.
Powiązania:
https://bibliotekanauki.pl/articles/1401960.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
25.20.Dc
Opis:
In this study, boralyn (boron carbide-aluminum metal matrix composite material - Al/B₄C) composite materials were investigated on shielding effect against gamma and neutron radiations. The samples were prepared as 5 wt%, 10 wt%, 15 wt%, and 20 wt% reinforcement content and for each content of material has composed in five different average particle sized (3 μm, 53 μm, 113 μm, 200 μm, and 500 μm). Linear and mass attenuation coefficients were calculated experimentally for each composite material against Cs-137 gamma source. Theoretical mass attenuation coefficients of material were calculated by using XCOM computer code. Then the theoretical results were compared with experimental results. Then, macroscopic cross-section values were calculated experimentally for each composite material against Pu-Be neutron source. As the conclusion of the study, it could be understood that in spite of decrease of the attenuation coefficient against gamma radiation, the adding materials give rise to increase the shielding ability of material against neutron radiation.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-176-B-179
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of Boron in Nd(Co$\text{}_{1-x}$B$\text{}_{x}$)$\text{}_{5}$ System
Autorzy:
Kowalczyk, A.
Smardz, L.
Powiązania:
https://bibliotekanauki.pl/articles/1964570.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.30.Et
Opis:
The influence of boron atoms on the magnetic properties of Νd(Co$\text{}_{1-x}$B$\text{}_{x}$)$\text{}_{5}$ (i.e. ΝdCo$\text{}_{5}$, NdCo$\text{}_{4}$B, Νd$\text{}_{3}$Co$\text{}_{11}$Β$\text{}_{4}$ and Νd$\text{}_{2}$Co$\text{}_{7}$Β$\text{}_{3}$) compounds has been studied. These structures are based on the well-known CaCu$\text{}_{5}$ structure. They all have the hexagonal symmetry and belong to the space group of P6/mmm. The experimental values of the Curie temperatures (T$\text{}_{c}$) of Nd(Co$\text{}_{1-x}$B$\text{}_{x}$)$\text{}_{5}$ are used to calculate the effective intersublattice exchange interactions (J$\text{}_{NdCO}$) between Nd and Co sublattices. As the Β content increases, a tendency to decrease in J$\text{}_{NdCO}$ and T$\text{}_{c}$ is found. This variation is compared with that observed for the Co magnetic moment.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 285-288
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Energy Loss of the Partially Stripped Boron-Like and Carbon-Like Fast Ions
Autorzy:
Gümüş, H.
Özalp, C.
Köroğlu, A.
Powiązania:
https://bibliotekanauki.pl/articles/2035735.pdf
Data publikacji:
2003-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.50.Bw
61.85.+p
Opis:
An analytical formula of the electronic stopping power expression in this study was derived for swift boron-like and carbon-like ions by using first-order perturbation theory and frozen-charge-state model. The Hartree- Fock-Slater determinant was used for the description of the bound electrons attached to ions in the ground state and orbital-screening parameter was determined by variational method. The calculated ground state energies in this study were compared with the results of Clementi-Roetti and they are in good agreement with 5%. It has been observed that the difference of energy loss for boron-like and carbon-like projectiles in a frozen-charge state increases as an atomic number increases. Furthermore, the analytical expression of the effective charge of boron-like and carbon-like projectiles was derived.zapisz i p
Źródło:
Acta Physica Polonica A; 2003, 103, 4; 349-363
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indications for Diamagnetic Shift in the Ground State of Boron in Silicon
Autorzy:
Stöhr, M.
Chroboczek, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/1891427.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Ht
71.70.-d
72.20.-i
Opis:
Indications for the observation of the diamagnetic shrinkage of the boron acceptor wave function (WF) in Si are reported. Uniaxial stress (X) was used to split the ground state (GS) of the boron acceptor into two energy levels with spatially complementary WF. The magnetic field selectively induces a shrinking of one of the two WF, depending on whether it is applied parallel or perpendicular to the X axis. As a result, the hopping transitions between lower and higher energy levels are redistributed, leading to significant changes in the activation energy ε$\text{}_{3}$. This effect was borne out by experiment.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 465-468
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Characteristics of the Boron Doped MnO Films Deposited by Spray Pyrolysis Method
Autorzy:
Bedir, M.
Tunç, A.
Öztas, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398927.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Nr
78.20.-e
Opis:
Boron doped MnO films were prepared by spray pyrolysis technique at 375°C substrate temperature, which is a low cost and large area technique to be well-suited for the manufacture of solar cells, using boric acid (H₃BO₃) as dopant source, and their properties were investigated as a function of doping concentration. Boron doping was achieved by adding 0.1 M, 0.2 M, 0.3 M, and 0.4 M H₃BO₃ to the starting solution. X-ray analysis showed that the films were polycrystalline fitting well with a cubic structure and have preferred orientation in (111), (220) and (311) directions. Optical band gap of the undoped and B-doped MnO films were found to vary from 2.25 to 2.54 eV. The changes observed in the energy band gap and structural properties of the films related to the boric acid concentration are discussed in detail.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1159-1164
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:
Improved Czochralski Growth of Germanium Single Crystals from a Melt Covered by Boron Oxide
Autorzy:
Taishi, T.
Yonenaga, I.
Hoshikawa, K.
Powiązania:
https://bibliotekanauki.pl/articles/1399429.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
61.72.Ff
61.72.uf
Opis:
In germanium (Ge) crystal growth, a serious problem in growing high quality Ge crystals is the formation of germanium-oxide-particles on the melt surface. In addition, B doping in Ge crystals is very difficult because of the segregation coefficient, which is greater than unity, and the instability of free B atoms in the Ge melt. We have found a unique solution, which is CZ-Ge crystal growth from a melt covered by boron oxide ($B_2O_3$). Ge crystals which are dislocation-free and/or oxygen-enriched can be grown by these improved CZ techniques. Current and planned research using such Ge crystals is introduced.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 231-234
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the hydrogen adsorption to the optical properties of boron nitride nanotubes
Autorzy:
Bayani, A.
Powiązania:
https://bibliotekanauki.pl/articles/1070608.pdf
Data publikacji:
2016-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Ch
85.35.-p
68.43.-h
67.63.Cd
67.80.ff
Opis:
In this research we have studied physisorption of hydrogen molecules on armchair (3,3) boron-nitride nanotube using density functional methods. Optical properties of the boron-nitride nanotube, with and without adsorbed H₂ molecules, were investigated under parallel and perpendicular polarized electric fields. The results indicate that the nanotube optical gap slightly changes due to H₂ physisorption and increasing H₂ physisorption suppresses the boron-nitride nanotube optical spectrum. Also, the nanotube gets more transparent as the H₂ concentration increases, in other words boron-nitride nanotube dielectric function decreases. Anisotropic dielectric function is another result which is determined by random phase approximation method.
Źródło:
Acta Physica Polonica A; 2016, 129, 3; 348-351
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and optical properties of boron nitride grown by MOVPE
Autorzy:
Dąbrowska, A.
Pakuła, K.
Bożek, R.
Rousset, J.
Ziółkowska, D.
Gołasa, K.
Korona, K.
Wysmołek, A.
Stępniewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1160531.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Gh
78.30.Fs
78.20.-e
Opis:
Boron nitride layers were grown on sapphire substrate by metal organic vapor phase epitaxy system that was originally designed for growth of GaN. Structures were characterized by scanning electron microscopy, atomic force microscopy, the Raman spectroscopy, absorption and time resolved photoluminescence. Presented results confirm successful deposition of BN layers and gives information about basic properties of the material. The Raman line at 1370 cm^{-1} and absorption edges at 5.6-5.9 eV were observed which is related to hexagonal phase.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-129-A-131
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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