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Wyświetlanie 1-15 z 17
Tytuł:
Performance evaluation of a rectifi er column using gamma column scanning
Autorzy:
Aquino, D. D.
Mallillin, J. P.
Sulit, R. F.
Hila, F. C.
Nuñez, I. A. A.
Bulos, A. D. M.
Powiązania:
https://bibliotekanauki.pl/articles/146268.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
gamma column scanning
distillation column
density profile
processing plant
refinery
Opis:
Rectifier columns are considered to be a critical component in petroleum refineries and petrochemical processing installations as they are able to affect the overall performance of these facilities. It is deemed necessary to monitor the operational conditions of such vessels to optimize processes and prevent anomalies which could pose undesired consequences on product quality that might lead to huge financial losses. A rectifier column was subjected to gamma scanning using a 10-mCi Co-60 source and a 2-inch-long detector in tandem. Several scans were performed to gather information on the operating conditions of the column under different sets of operating parameters. The scan profiles revealed unexpected decreases in the radiation intensity at vapour levels between trays 2 and 3, and between trays 4 and 5. Flooding also occurred during several scans which could be attributed to parametric settings.
Źródło:
Nukleonika; 2017, 62, 4; 285-287
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of high quality doped CeO2 solid electrolytes with nanohetero structure
Autorzy:
Mori, T.
Drennan, J.
Ou, D.
Ye, F.
Powiązania:
https://bibliotekanauki.pl/articles/146211.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
doped CeO2
oxide ionic conductivity
microdomain
low temperature operation of fuel cells application
Opis:
Doped ceria (CeO2) compounds are fluorite related oxides which show oxide ionic conductivity higher than yttria-stabilized zirconia in oxidizing atmosphere. As a consequence of this, a considerable interest has been shown in application of these materials for low (400-650°C) temperature operation of solid oxide fuel cells (SOFCs). In this paper, our experimental data about the influence of microstructure at the atomic level on electrochemical properties were reviewed in order to develop high quality doped CeO2 electrolytes in fuel cell applications. Using this data in the present paper, our original idea for a design of nanodomain structure in doped CeO2] electrolytes was suggested. The nanosized powders and dense sintered bodies of M doped CeO2 (M:Sm,Gd,La,Y,Yb, and Dy) compounds were fabricated. Also nanostructural features in these specimens were introduced for conclusion of relationship between electrolytic properties and domain structure in doped CeO2. It is essential that the electrolytic properties in doped CeO2 solid electrolytes reflect in changes of microstructure even down to the atomic scale. Accordingly, a combined approach of nanostructure fabrication, electrical measurement and structure characterization was required to develop superior quality doped CeO2 electrolytes in the fuel cells.
Źródło:
Nukleonika; 2006, 51,suppl.1; 11-18
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methane cracking and secondary hydrocarbon generation in inductively coupled RF plasmas
Autorzy:
Tabarés, F. L.
Alegre, D.
Mozetič, M.
Vesel, A.
Powiązania:
https://bibliotekanauki.pl/articles/146424.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plasma
RF discharges
hydrocarbon cracking
methane reforming
plasma-assisted chemical vapour deposition (PACVD)
carbon films
Opis:
Pure methane plasmas have been produced in an inductively coupled radio frequency (ICRF) reactor with quartz walls in the absence of carbon film deposition. A differentially pumped mass spectrometer was used for the recording of the secondary hydrocarbon species produced in the reactor. The functional dependences of these species with plasma parameters has been analyzed and tentative mechanisms for their formation have been formulated. High power per molecule ratio promotes methane decomposition and acetylene formation.
Źródło:
Nukleonika; 2012, 57, 2; 287-290
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation curing of silica for silica-rubber composites
Autorzy:
Dondi, D.
Palamini, C.
Pepori, F.
Buttafava, A.
Galinetto, P.
Faucitano, A.
Powiązania:
https://bibliotekanauki.pl/articles/148026.pdf
Data publikacji:
2009
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
radiation
silica-rubber composites
modified silica
Opis:
The functional modification of silica samples based on the reaction of “grafting” of polybutadiene olygomers carried out by gamma-irradiation in the presence of air at room temperature has been investigated. The yield of grafted PB reaches a maximum at doses of about 30 kGy, then decreases as a consequence of the oxidative degradation. The reaction is accompanied by the build up of carbonyls and peroxides up to 0.1 moles/kg and it leads to a rapid consumption of the double bonds concentration as determined by both FTIR and Raman spectroscopy. The results of the EPR analysis are diagnostic of a mechanism of immobilization of the olygomer based on cross-linking of polybutadiene which is initiated by the SiO2 radiolytic species. Depending on the nature of the SiO2 species, the mechanism of initiation leads to immobilized PB either really grafted to the silica surface or simply physically absorbed.
Źródło:
Nukleonika; 2009, 54, 2; 71-75
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Search for canted spin arrangement in Er2-xTbxFe14B with Mössbauer spectroscopy
Autorzy:
Kurzydło, P. M.
Bogacz, B. F.
Pędziwiatr, A. T.
Oleszak, D.
Przewoźnik, J.
Powiązania:
https://bibliotekanauki.pl/articles/147036.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer effect
permanent magnet materials
spin diagrams
spin reorientation
Opis:
The materials studied were polycrystalline compounds Er2-xTbxFe14B (x = 0.1, 0.2, 0.3, 0.4) which crystallize in a tetragonal lattice and display a variety of spin arrangements. The compounds have been measured with 57Fe Mössbauer spectroscopy over the temperature range 80–320 K in order to investigate the spin reorientation processes. Each compound was studied in a wide temperature range, with precise Mössbauer scanning in the vicinity of the transition. The set of spectra obtained for a given compound was analyzed using simultaneous fi tting procedure to investigate the infl uence of the transition on the shape of the spectra. The fi tting program was specifi ed to analyze the transition according to the ‘two state model’: spins fl ip abruptly from initial angle to fi nal arrangement (90° angle). Obtained results suggest that spin reorientation process cannot be described using only the mentioned above model. Additional computer simulations based on the Yamada–Kato model were conducted to determine temperature range and the type of spin alignments in the vicinity of the transition. These theoretical results supported by spectra analysis suggest the existence of intermediate (canted) spin arrangements in the studied compounds. The spin arrangement diagram was constructed.
Źródło:
Nukleonika; 2015, 60, 1; 93-96
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin reorientation process in Tm2–xHoxFe14B : analysis of conical arrangement based on Mössbauer spectra
Autorzy:
Kurzydło, P. M.
Pędziwiatr, A. T.
Bogacz, B. F.
Przewoźnik, J.
Oleszak, D.
Powiązania:
https://bibliotekanauki.pl/articles/148120.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
permanent magnetic materials
Mössbauer effect
spin reorientation
spin diagrams
Opis:
The spin reorientation process in the Tm2–xHoxFe14B series of compounds was studied using 57Fe Mössbauer spectroscopy over the temperature range 5.2–320 K with a focus on the analysis of conical spin arrangement. Each compound was studied by precise Mössbauer scanning in the vicinity of the transition and during the transition. By applying computer simulations based on the simplified Yamada-Kato model, as well as on some literature data for R2Fe14B (R = Tm, Ho) compounds, the above series was selected for studies as it contains compounds with different spin arrangements (axial, planar, conical). It was a crucial requirement for obtaining unambiguous angular dependences when applying a simultaneous fitting procedure of Mössbauer spectra. Such an extended procedure was applied which allowed the temperature dependence of the angle describing the position of the magnetization vector to be obtained. The results were compared with those from theoretical simulations. The spin arrangement diagram was constructed. A conical spin arrangement was confirmed over a wide temperature range.
Źródło:
Nukleonika; 2017, 62, 2; 123-127
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uranium and neodymium partitioning in alkali chloride melts using low-melting gallium-based alloys
Autorzy:
Melchakov, S. Y.
Maltsev, D. S.
Volkovich, V. A.
Yamshchikov, L. F.
Lisienko, D. G.
Osipenko, A. G.
Rusakov, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/146407.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
neodymium
uranium
gallium
separation factor
reductive extraction
pyrochemical reprocessing
Opis:
Partitioning of uranium and neodymium was studied in a ‘molten chloride salt – liquid Ga-X (X = In or Sn) alloy’ system. Chloride melts were based on the low-melting ternary LiCl-KCl-CsCl eutectic. Nd/U separation factors were calculated from the thermodynamic data as well as determined experimentally. Separation of uranium and neodymium was studied using reductive extraction with neodymium acting as a reducing agent. Efficient partitioning of lanthanides (Nd) and actinides (U), simulating fission products and fissile materials in irradiated nuclear fuels, was achieved in a single stage process. The experimentally observed Nd/U separation factor valued up to 106, depending on the conditions.
Źródło:
Nukleonika; 2015, 60, No. 4, part 2; 915-920
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metrological aspects of international intercomparison of passive radon detectors under field conditions in Marie Curie’s tunnel in Lurisia
Autorzy:
Cardellini, F.
Chiaberto, E.
Garlati, L.
Giuffrida, D.
Leonardi, F.
Magnoni, M.
Minchillo, G.
Prandstatter, A.
Serena, E.
Trevisi, R.
Tripodi, R.
Veschetti, M.
Powiązania:
https://bibliotekanauki.pl/articles/146585.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
active monitors
calibration
intercomparison
radon
Opis:
In 2014, an intercomparison exercise of passive radon detectors under field conditions in the Marie Curie’s tunnel belonging to the Lurisia spas complex (Lurisia, Piedmont, Italy) has been held. Radon activity concentration in the tunnel was measured with six radon active monitors, previously calibrated at ENEA-INMRI facilities. In the present paper, a synthesis of the metrological aspects of the intercomparison is given. Indeed particular attention was paid to metrological characterization of radon monitors and their response upon ambient conditions. Correction factors have been defined to be applied when measurements are performed in severe environmental conditions. In particular, it has been found that monitors are particularly sensitive to the effect of air density: the AlphaGUARD (AG-SAPHYMO, GmbH) effi ciency decreases with the air density, while for the MR1 PLUS (Tesys, Italy), the opposite applies. When the reference monitors were placed into the Marie Curie’s tunnel, to the recorded average radon concentrations correction factors were applied. After the correction the difference between data coming from AG and MR1 PLUS is within the 1.7%.
Źródło:
Nukleonika; 2016, 61, 3; 257-261
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Main results of the international intercomparison of passive radon detectors under field conditions in Marie Curie’s tunnel in Lurisia (Italy)
Autorzy:
Cardellini, F.
Chiaberto, E.
Garlati, L.
Giuffrida, D.
Leonardi, F.
Magnoni, M.
Minchillo, G.
Prandstatter, A.
Serena, E.
Trevisi, R.
Tripodi, R.
Veschetti, M.
Powiązania:
https://bibliotekanauki.pl/articles/146811.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
in-field conditions
intercomparison
passive detectors
radon
Opis:
In recent years a large number of radon intercomparison exercises has been organized; most of them took place in radon chambers, in reference atmosphere of the parameter to control (i.e. radon gas) under temperature, humidity and atmospheric pressure stable conditions. In 2014, in the tunnel belonging to the Lurisia spas complex (Lurisia, Piedmont, Italy), with natural high concentrations of uranium and radon gas, an intercomparison exercise has been held to give to radon measurement services and laboratories the possibility to test their passive systems under field conditions, which are less controlled and much more challenging. The response of laboratories was very positive: 46 participants from 10 European countries and 3 non-European countries. Generally about 80% of results of participants were considered acceptable even if it was observed a global trend of a substantial underestimation of the actual radon concentration.
Źródło:
Nukleonika; 2016, 61, 3; 251-256
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The IBA self-extracting cyclotron project
Autorzy:
Kleeven, W.
Lucas, S.
Delvaux, J.
Swoboda, F.
Zaremba, S.
Beeckman, W.
Vandeplassche, D.
Abs, M.
Powiązania:
https://bibliotekanauki.pl/articles/148721.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
cyclotron
extraction
radioisotopes
Opis:
The self-extracting cyclotron is a high-intensity 14 MeV H+ machine for isotope production. There is no electrostatic deflector. Extraction is achieved with a special shaping of the magnetic field. There are two long poles and two short poles, both with an elliptical gap profile; this provides a steep fall off of the magnetic field at the pole radii. An extraction groove is machined in the iron of one of the longer poles. First harmonic coils create a large orbit separation at the entrance of the extraction path and extract the beam. The machine is presently installed in the industrial isotope production site where the final commissioning and tests took place. Beams of more than 1.5 mA have been extracted and transported. Further development is ongoing in order to increase the current on target to at least 2 mA in the coming months. Commercial isotope production will start in the course of this year. The concept of the machine is explained and the layout of the machine and beam lines is presented. Results of orbit calculations and central region optimizations are given. Results of the measurement of extracted beam shapes and emittances are given. The progress and present status of the project are discussed.
Źródło:
Nukleonika; 2003, 48,suppl.2; 59-67
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fusion reaction scaling in a mega - amp dense plasma focus
Autorzy:
Lerner, E. J.
Murali, S. K.
Blake, A. M.
Shannon, D. M.
van Roessel, F. J.
Powiązania:
https://bibliotekanauki.pl/articles/147522.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dense plasma focus (DPF)
fusion reaction scaling
neutron yield saturation
Opis:
The dense plasma focus (DPF) is one of the most efficient sources of fusion reactions for a given energy input. For smaller DPFs, fusion output scales as I4 or faster, where I is peak current. However, energy output in high-current machines saturates at 1012 reactions with deuterium as fill gas. To attempt to overcome this saturation, experiments at the focus fusion-1 (FF-1) facility have tested the use of smaller-radius electrodes (2.8 cm radius anode) and higher fill-gas densities more than 30 T.
Źródło:
Nukleonika; 2012, 57, 2; 205-209
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary results of spatial distribution of uranium and thorium in soil profi les near a uranium industrial site, Guangdong province, China
Autorzy:
Wang, J.
Liu, J.
Chen, Y.
Song, G.
Chen, D.
Xiao, T.
Li, H.
Wang, C.
Jiang, F.
Powiązania:
https://bibliotekanauki.pl/articles/146530.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
spatial distribution
thorium
uranium
U/Th ratio
Opis:
Four soil profiles were collected from locations with different distances (5, 50, 250 and 1000 m) from a uranium mill tailings dam, Guangdong province, China, to investigate the pollution status of the soil in mining/ milling-related areas based on the contents of uranium (U) and thorium (Th), thus to understand the impacts of uranium industrial activities to the surroundings. The U and Th concentrations were determined by inductively coupled plasma mass spectrometry (ICP-MS) after conventional HF-HNO3-HClO4 digestion procedures. The results indicate that the soils within 50 m from uranium tailing were severely contaminated; those in 250 and 1000 m soil samples were observed to be with local background level even though these in 250 m had slightly higher U/Th ratios. Uranium concentrations varied from 5.50 ± 0.27 to 160.55 ± 8.03 mg/kg, with maximum values recorded in an intermediate layer of the 5-m distance soil profile. In comparison, the concentration of Th ranged from 6.02 ± 0.30 to 84.71 ± 4.24 mg/kg, with maximum values observed in the top layer of the 1000-m distance soil profile. The U/Th ratio varied from 0.15 to 11.99 compared with 0.20, 0.22 and 0.26 of the average for Guangdong province, national China and the world, respectively. The mean U/Th of four soil profiles showed a reduction with distance from the uranium mill tailing dam, suggesting the relatively large magnitude of uranium elevation in soils within limited distances.
Źródło:
Nukleonika; 2016, 61, 3; 367-371
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of diagnostic tools for Plasma Focus derived X-ray source
Autorzy:
Angeli, E.
Bonifazzi, C.
Da Re, A.
Marziani, M.
Tartari, A.
Frignani, M.
Mannucci, S.
Mostacci, D.
Rocchi, F.
Sumini, M.
Powiązania:
https://bibliotekanauki.pl/articles/147434.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plasma focus
electron impact ionization
characteristic X-ray lines
bremsstrahlung
material heating
dosimetry
Opis:
The energy spectra of X-rays generated by the impact of electron beams on high- and medium-Z targets following the pinch implosion of Plasma Focus (PF) devices are discussed in terms of the possible mechanisms of X-ray production following electron impact ionization. In addition, the temperature measurement of the PF inner electrode is reported and some results have been proved useful in order to optimize the device functionalities.
Źródło:
Nukleonika; 2006, 51, 1; 15-20
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The indoor radon survey in Serbian schools: can it reflect also the general population exposure?
Autorzy:
Žunić, Z. S.
Bossew, P.
Veselinović, N.
Bochicchio, F.
Carelli, V.
Vaupotič, J.
Čuknić, O.
Simović, R.
Vojinović, Z.
Kisić, D
Tollefsen, T.
Powiązania:
https://bibliotekanauki.pl/articles/148743.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
indoor radon
survey
school
Serbia
Opis:
A systematic indoor radon survey in elementary schools of Serbia is underway since 2008. Its current first phase covers all elementary schools in predominantly rural communities of Southern Serbia. The design of the survey, its implementation and the current state of its realization is shortly described. Part of this paper is devoted to discussion of the question if this survey could produce results representative also of the radon concentration in dwellings and of radon exposure of the general population, discussing some statistical aspects of representativity which arose during the work, namely, if the implementation leads to an unbiased estimate of the targeted quantities.
Źródło:
Nukleonika; 2010, 55, 4; 419-427
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tubing decontamination during the leak test of iodine-125 seeds
Autorzy:
Moura, J. A.
Moura, E. S.
Sprenger, F. E.
Nagatomi, H. R.
Zeituni, C. A.
Feher, A.
Manzoli, J. E.
Souza, C. D.
Rostelato, M. E.
Powiązania:
https://bibliotekanauki.pl/articles/148765.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
brachytherapy
iodine seeds
leak test
sealed radioactive sources
Opis:
Leak tests were made to detect any leakage of radioactive material from inside the iodine-125 seeds applied in brachytherapy. These seeds are used in prostate cancer treatment. In the quality control routine, during seed production, leak tests are performed according to the International Standard Organization – radiation protection – sealed radioactive sources – ISO-9978 standard, and require liquid transfer between recipients. Any leakage causes contamination of the liquid and tubes. The aim of this study is the establishment of decontamination routines for tubes, allowing their repeated use, in the automated assay process.
Źródło:
Nukleonika; 2010, 55, 3; 409-413
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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