53 results on '"S. Jokic"'
Search Results
2. INFLUENCE OF DRYING TEMPERATURE ON DRYING KINETICS AND PHYSICO-CHEMICAL PROPERTIES OF TWO CHESTNUT VARIETIES (CASTAENEA SATIVA MILL.)
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D. Ackar, I. Mujic, D. Subaric, S. Jokic, D. Velic, M. Bilic, and G. Bounous, G.L. Beccaro
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biology ,Correlation coefficient ,Chemistry ,Starch ,Kinetics ,Airflow ,Horticulture ,Marron ,biology.organism_classification ,Thermal diffusivity ,chemistry.chemical_compound ,Cultivar ,Fruit tree ,drying ,chestnut ,mathematical model ,effective diffusivity ,colour ,digestibility of starch - Abstract
The convective air-drying of two chestnut varieties was evaluated in a laboratory drying oven, at different drying air temperatures (40, 50, 60 and 70°C) and airflow velocities of 2.80 m s -1 . The drying kinetics were compared and the effect of different air-drying temperatures on colour stability, effective diffusivity and starch digestibility was analysed. The two varieties of chestnut used in this study were of the type Castanea sativa (Istrian marron and Italian chestnut). The kinetic equations were estimated using an exponential mathematical model (Page). The results of the estimation have exhibited correspondence to the experimental results. The rate constants, k and n, of the exponential and Page's model for thin-layer drying were established by regression analysis of the experimental data which were found to be affected by drying air temperature. It can be seen that a good agreement between the experimental data and the chosen mathematical model (Page's) exists, which is confirmed by high values of correlation coefficient (0.99) in all run. The influence of temperature on the drying process is an important aspect and should be taken into consideration when choosing the optimal operation conditions. Results show that certain temperatures had a significant effect on the drying rates of chestnut. The drying air temperature significantly influenced the total drying time, which is strongly related to the total energy requirement for drying. The values of effective diffusivity were found to vary in the range of 1,64·10 -9 to 7,88·10 -9 m 2 s -1 for Istrian marron samples and in the range of 8,65·10 -10 to 4,40·10 -9 m 2 s -1 for Italian chestnut samples. Colour change of both varieties was generally increased with the increase of the drying temperature, with the exception of Istrian marron, where colour change was larger after drying at 50°C than after drying at 60°C (probably due to longer exposure to elevated temperature). Digestibility of starch, determined by AOAC 2002.02 method, was increased by drying for both chestnut varieties (Istrian marron and Italian chestnut).
- Published
- 2010
3. Heavy fragment production in reactions at 0.65–
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S. Jokic, Svetislav Savović, B. Grabež, and Ž. Todorović
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Nuclear reaction ,Radiation ,010308 nuclear & particles physics ,Fission ,Chemistry ,Radiochemistry ,01 natural sciences ,Particle detector ,Nuclear physics ,Fragmentation (mass spectrometry) ,0103 physical sciences ,Incident energy ,Spallation ,010306 general physics ,Instrumentation - Abstract
The processes of production of heavy fragments in the fission mass region in the interaction of 0.65, 1.74, 5.1, 8.8 and 12.7 GeV 4 He with 232 Th have been analyzed using the polycarbonate track detector Makrofol in the form of a sandwich. The decay channels ending with one, two, or more (three, four) fragments were detected. We have analyzed the events in which at least one heavy fragment (Z>20) was registered. Fragments produced in the experiment were identified and an event-by-event model-free analysis was performed in order to separate different production mechanisms. We have identified the events produced in fission, deep spallation and fragmentation processes. The cross-sections and experimental features have been determined for the various reaction mechanisms, and their variation as a function of the incident energy has been investigated.
- Published
- 2003
4. Measurement of 232Th(n,5n γ) cross sections from 29 MeV to 42 MeV
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S. Jokic, Ralf Nolte, P. Baumann, G. Rudolf, M. Reginatto, Arjan J. Koning, A. Nachab, Jean-Pierre Meulders, A. Pavlik, M. Kerveno, P. Dessagne, Strahinja Lukić, and E. Jericha
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Physics ,Excitation function ,Nuclear and High Energy Physics ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,Fission ,Astrophysics::High Energy Astrophysical Phenomena ,Cyclotron ,Neutron radiation ,01 natural sciences ,7. Clean energy ,Semiconductor detector ,law.invention ,Nuclear physics ,Time of flight ,law ,0103 physical sciences ,Ionization chamber ,Nuclear fusion ,Atomic physics ,Nuclear Experiment ,010306 general physics - Abstract
The excitation function of the reaction 232 Th(n, 5nγ)228 Th from 29 to 42 MeV has been measured for the first time at the quasi-monoenergetic neutron beam of the UCL cyclotron CYCLONE employing the 7Li(p,n) source reaction. Taking advantage of the good energy resolution of the planar High-Purity Germanium (HPGe) detectors, prompt γ-ray spectroscopy was used to detect the γ-rays resulting from the decay of excited states of nuclei created by the (n,xn) reactions. The neutron beam was characterized by a combination of time of flight measurements carried out using a liquid scintillation detector and a 238U fission ionization chamber. Fluence measurements were performed using a proton recoil telescope. The results are compared with TALYS-1.4 code calculations.
- Published
- 2014
5. Application of D-optimal experimental design method to optimize the formulation of O/W cosmetic emulsions
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S. Jokic, Jelena Djuris, Svetlana Ibrić, and Dragana Vasiljević
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Aging ,Cetearyl glucoside ,Stereochemistry ,Quadratic model ,Stabiliser ,Pharmaceutical Science ,formulation ,Cosmetics ,Dermatology ,emulsions ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,computer modelling ,Stearate ,Drug Discovery ,mixture design ,Anova test ,D optimal ,cetearyl glucoside ,stability ,chemistry ,Chemistry (miscellaneous) ,Lotion ,co-emulsifiers ,Emulsions ,Stearic acid ,Nuclear chemistry - Abstract
Synopsis Objective This study investigates the application of D-optimal mixture experimental design in optimization of O/W cosmetic emulsions. Cetearyl glucoside was used as a natural, biodegradable non-ionic emulsifier in the relatively low concentration (1%), and the mixture of co-emulsifiers (stearic acid, cetyl alcohol, stearyl alcohol and glyceryl stearate) was used to stabilize the formulations. Methods To determine the optimal composition of co-emulsifiers mixture, D-optimal mixture experimental design was used. Prepared emulsions were characterized with rheological measurements, centrifugation test, specific conductivity and pH value measurements. Results All prepared samples appeared as white and homogenous creams, except for one homogenous and viscous lotion co-stabilized by stearic acid alone. Centrifugation testing revealed some phase separation only in the case of sample co-stabilized using glyceryl stearate alone. The obtained pH values indicated that all samples expressed mild acid value acceptable for cosmetic preparations. Specific conductivity values are attributed to the multiple phases O/W emulsions with high percentages of fixed water. Results of the rheological measurements have shown that the investigated samples exhibited non-Newtonian thixotropic behaviour. To determine the influence of each of the co-emulsifiers on emulsions properties, the obtained results were evaluated by the means of statistical analysis (ANOVA test). On the basis of comparison of statistical parameters for each of the studied responses, mixture reduced quadratic model was selected over the linear model implying that interactions between co-emulsifiers play the significant role in overall influence of co-emulsifiers on emulsions properties. Conclusion Glyceryl stearate was found to be the dominant co-emulsifier affecting emulsions properties. Interactions between the glyceryl stearate and other co-emulsifiers were also found to significantly influence emulsions properties. These findings are especially important as they can be used for development of the product that meets users' requirements, as represented in the study. Resume Objectif La presente etude examine l' application de la conception D- optimal dans l'optimisation des emulsions cosmetiques H / E. Le cetearylglucoside a ete utilise comme emulsifiant non – ionique naturel, biodegradable, dans une concentration relativement faible (1%), et le melange de co-emulsionnants (l'acide stearique, l'alcool cetylique, l'alcool stearique et le stearate de glyceryle) a ete utilise pour stabiliser des formulations. Methodes Afin de determiner la composition optimale du melange de co-emulsifiants, le design experimental de melange “D- optimal” a ete utilise. Les emulsions preparees ont ete caracterisees par des mesures rheologiques, le test de centrifugation, la conductivite specifique et des mesures de la valeur du pH. Resultats Tous les echantillons prepares sont apparus comme des cremes blanches et homogenes, sauf pour une lotion homogene et visqueuse co- stabilise par de l'acide stearique seul. Les tests de centrifugation ont revele une certaine separation de phase seulement dans le cas de l'echantillon co-stabilise a l'aide de stearate de glyceryl seul. Les valeurs de pH obtenus indiquent que tous les echantillons ont exprime des valeurs legerement acides acceptables pour des preparations cosmetiques. Des valeurs de conductivite specifique sont attribuees a des emulsions H / E a phases multiples avec des pourcentages eleves d'eau fixee. Les resultats des mesures rheologiques ont montre que les echantillons etudies ont affiche un comportement thixotrope non – newtonien. Afin de determiner l'influence de chacun des co-emulsifiants sur les proprietes des emulsions, les resultats obtenus ont ete evalues par le biais de l'analyse statistique (test ANOVA). Sur la base de la comparaison des parametres statistiques pour chaque melange, un modele quadratique a ete selectionne preferentiellement sur le modele lineaire ce qui implique que les interactions entre les co-emulsifiants jouent un role important dans l'influence globale des proprietes des co-emulsifiants d'emulsions. Conclusion le stearate de glycerol s'est revele etre le co- emulsifiant dominant affectant les proprietes des emulsions. Les interactions entre le stearate de glycerol et d'autres co-emulsifiants ont egalement ete trouvese a influencer de maniere significative les proprietes des emulsions. Ces resultats sont particulierement importants car ils peuvent etre utilises pour le developpement des produits qui repondent aux besoins des utilisateurs, tels que representes dans l'etude.
- Published
- 2014
6. Fission of Pb in the 4He-induced reactions at 0.65–
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Ž. Todorović, Svetislav Savović, B. Grabež, and S. Jokic
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Physics ,Radiation ,Isotope ,Fission ,chemistry.chemical_element ,01 natural sciences ,Particle detector ,010305 fluids & plasmas ,Nuclear physics ,Helium-4 ,chemistry ,Coincident ,0103 physical sciences ,010306 general physics ,Instrumentation ,Isotopes of helium ,Helium ,Excitation - Abstract
The fission processes from the interactions of 0.65, 1.74, 5.1, 8.8 and 12.7 GeV 4 He with Pb have been analyzed using the polycarbonate track detector Makrofol in the form of a sandwich. The decay channels ending with one, two, or more (three, four) fragments were detected. We analyzed events in which only two heavy fragments ( Z >20) are detected, irrespective of the existence of coincident intermediate mass fragments (8⩽ Z ⩽20). Using the correlation between the common observables which characterize fission events, we identified events originated from thermal (soft) fission and more violent processes. Cross sections, angular distributions and excitation energy have been determined for two fission mechanisms, and their variation as a function of the incident energy has been investigated.
- Published
- 2001
7. Cloud-based System for Real-Time Reading of Smart Meters’ Data over 5G New Radio
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M. Forcan, M. Maksimović, J. Forcan, and S. Jokić
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5g ,cloud computing ,smart meter ,smart grid ,Telecommunication ,TK5101-6720 - Abstract
The potential of the combined application of Cloud computing and the fifth generation of cellular network technology (5G) in Smart Grid (SG) could be revolutionary in terms of empowering the Advanced Metering Infrastructure (AMI). The model of a real-time 5G-based communication system for remote reading of Smart Meters’ data is developed and presented in this paper. Online monitoring of power demand has been performed using the Cloud-based platform ThingSpeak. The proposed 5G communication model and online monitoring function have been tested and validated using a power demand variation scenario in a well-known IEEE 13 node network. The obtained results confirm the model accuracy and reveal the potential of AMI based on real-time data transmission between Smart meters (SM) and Cloud computing platform using a 5G communication network.
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- 2021
- Full Text
- View/download PDF
8. Fission dynamics for capture reactions in systems: New results in terms of thermal energy and neutron multiplicity correlated distributions
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F. Schussler, François-René Lecolley, S. Jokic, A. Huck, F. Farget, Louise Stuttge, G. Perrin, J.F. Bruandet, I. M. Itkis, Yu. Ts. Oganessian, E. M. Kozulin, J.F. Lecolley, B. Bilwes, G. Costa, L.A. Litnevsky, L. Donadille, M. G. Itkis, N. A. Kondratiev, E. Liatard, S. Tomasevic, O. Dorvaux, J. Fayot, G. Guillaume, B. Benoit, P. Désesquelles, J.B. Viano, Francis Hanappe, D. Santos, G. Rudolf, Yu.A. Lazarev, and B. Vignon
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Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,business.industry ,Fission ,Nuclear Theory ,Composite number ,Multiplicity (mathematics) ,Dissipation ,7. Clean energy ,01 natural sciences ,Nuclear physics ,0103 physical sciences ,Neutron cross section ,Neutron ,Atomic physics ,Nuclear Experiment ,010306 general physics ,business ,Thermal energy ,Excitation - Abstract
The neutron multidetector DeMoN has been used to investigate the symmetric splitting dynamics in the reactions 58,64 Ni + 208 Pb with excitation energies ranging from 65 to 186 MeV for the composite system. An analysis based on the new backtracing technique has been applied on the neutron data to determine the two-dimensional correlations between the parent composite system initial thermal energy (ECNth) and the total neutron multiplicity (νtot), and between pre- and post-scission neutron multiplicities (νpre and νpost, respectively). The νpre distribution shape indicates the possible coexistence of fast-fission and fusion-fission for the system 58 Ni + 208 Pb (Ebeam = 8.86 A MeV). The analysis of the neutron multiplicities in the framework of the combined dynamical statistical model (CDSM) gives a reduced friction coefficient β = 23 ± 1225 × 1021 s−1, above the one-body dissipation limit. The corresponding fission time is τf = 40 ± 2046 × 10−21s.
- Published
- 1999
9. Ternary events measured with CR-39 in the reaction at 15 MeV/nucleon
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S. Jokic, Svetislav Savović, M. Zamani, F. Fernández, D.G. D'Enterria, and M. Debeauvais
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Radiation ,010308 nuclear & particles physics ,Chemistry ,Fission ,chemistry.chemical_element ,Uranium ,01 natural sciences ,Nuclear physics ,chemistry.chemical_compound ,medicine.anatomical_structure ,0103 physical sciences ,medicine ,Irradiation ,Atomic physics ,Multiplicity (chemistry) ,Nuclear Experiment ,010306 general physics ,Ternary operation ,CR-39 ,Nucleon ,Instrumentation ,Nucleus - Abstract
We report the study of the reaction 15 MeV/nucleon 238 U + 197 Au , in which up to 7 final heavy fragments have been detected, using a CR-39 plastic nuclear track detector. The measured multiplicity distributions indicate that the binary fission of one (U-like) or both (U-like and Au-like) primary products clearly dominates for peripheral and intermediate impact parameters exhausting more than 80% of the total cross section. Multifragment emission sets in for the most central collisions. Reactions with 3 heavy final fragments, accounting for half of the total cross section, have been analysed event-by-event after measuring the geometrical parameters of each detected track, assuming momentum conservation and using empirical range-energy-charged curves. Most of these ternary processes originate in a two-step mechanism: a initial peripheral projectile-target interaction plus a deep-inelastic process followed by the subsequent fission-like decay of one of the fragments (mainly the quasiprojectile). Indeed, the relative velocity between the two fastest fragments are clearly peaked at values close to the Viola systematics for the fission of a very-heavy nucleus.
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- 1999
10. Multifragment events in theU238+Au197reaction at 15 MeV/nucleon
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M. Debeauvais, E. Luguera, F. Fernández, S. Jokic, J. Ralarosy, David D'Enterria, J.C. Adloff, and M. Zamani
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Physics ,Nuclear and High Energy Physics ,Fission ,Projectile ,Nuclear Theory ,Nuclear physics ,Excited state ,Production (computer science) ,Impact parameter ,Atomic physics ,Nuclear Experiment ,Nucleon ,Ternary operation ,Energy (signal processing) - Abstract
The $^{238}\mathrm{U}$+$^{197}\mathrm{Au}$ reaction has been studied at 15 MeV/nucleon bombarding energy. Correlations between two to seven final fragments with $Zg~8$ have been measured using CR-39 nuclear track detectors. An event-by-event kinematic analysis was carried out for three-body exit channel reactions which exhaust about half of the final fragment production cross section. Most of these ternary processes can be associated with intermediate and peripheral impact parameters. The dominant reaction mechanism is shown to be that of a first binary quasielastic or dissipative collision followed by the sequential binary fission of the excited quasi-$U$ (or to a lesser extent of the excited target remnant). We observe also a net drift of nucleons from the target to the projectile prior to its decay.
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- 1995
11. On the determination of the time-scale of three-fragment emission in the 12.7 GeV He-4+U-238 reaction using the polycarbonate track detector Makrofol
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Alexandar Djordjevich, Svetislav Savović, S. Jokic, and Ž. Todorović
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Physics ,010308 nuclear & particles physics ,Detector ,Relative velocity ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Excited state ,visual_art ,0103 physical sciences ,visual_art.visual_art_medium ,Polycarbonate ,Atomic physics ,Multiplicity (chemistry) ,010306 general physics ,Nuclear Experiment ,Mathematical Physics - Abstract
The timescale for emission of three fragments (Z GT = 8) in the 12.7 GeV He-4+U-238 reaction has been studied using a sandwich configuration of the Makrofol polycarbonate track detector. In events with varying multiplicity of heavy fragments (Z GT 20), the differences of the correlation functions for relative angle and relative velocity between pairs of fragments have been studied in order to determine the fragment emission timescale. A sequential decay mechanism for the excited residual nuclei was found to be consistent with experimental data. It was determined that the fragment emission time decreased with decreasing multiplicity of heavy fragments from 1200 +/- 80 fm c(-1) for events with two heavy fragments to 400 +/- 50 fm c(-1) for events with one heavy fragment.
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- 2011
12. Application of SSNTD in nuclear physics and especially to the reaction 238U + Ag at 15 MeV/n
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F. Fernández, M. Debeauvais, S. Jokic, J.C. Adloff, Svetislav Savović, M. Zamani, and J. Ralarosy
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Nuclear physics ,Chemistry ,Cr 39 detector ,General Engineering ,Function (mathematics) ,Impact parameter ,Atomic physics - Abstract
Reactions of 15 MeV/n 238 U on Ag have been studied by means of CR 39 detector. Analysis of 3 pronged events was done and classified as a function of impact parameter. For 4 and 5 pronged events, two and three steps mechanisms were found.
- Published
- 1993
13. Study of deep subcritical electronuclear systems and feasibility of their application for energy production and radioactive waste transmutation
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Jindrich. Adam, Baldin, Anton Alexandrovich, N. Vladimirova, N. A. Gundorin, B. Guskov, V. Dyachenko, A.F. Elishev, M. Kadykov, E. Kostyuhov, V. Kransov, I. Marin, V. S. Pronskikh, Rogov, Anatoly, A. A. Solnyshkin, V. I. Stegailov, S. G. Stetsenko, S. Tyutyunikov, Furman, Walter, Tsoupko-Sitnikov, Vsevolod Mikhailovich, E. M. Belov, M. Galanin, V. Kolesnikov, N. Ryazansky, S. Solodchenkova, B. Fonarev, V. Chilap, A. Chinenov, Baldina, Elina, A. Balabekyan, Karapetyan, Gayane, I. Zhuk, S. V. Korneev, A.S. Potapenko, A. Safronova, V. N. Sorokin, V. V. Sorokin, A.M. Khilmanovich, B. Marcynkevich, Korbut, Tamara, Ch. Stoyanov, L. Kostov, Zhivkov, Petar, O. Yordanov, S Batzev, Ch. Protohristov, A. Kugler, V. Wagner, Majerle, Mitja, Krása, Antonín, O. Svoboda, Katovsky, Karel, O. Schasny, A. Tuleushev, Gudima, Konstantin, M. I. Baznat, Ravdandorj Togoo, D. Otgonsuren, Ts Tumendelger, Ts. Damdinsuren, M. Shuta, Elzbieta Strugalska-Gola, Stanisław Kilim, M. Bielewicz, A. Wojeciechowsky, V. A. Voronko, Sotnikov, Vladimir, V.V. Sidorenko, Haysak, Ivan, Hashemi-Nezhad, Reza, Y. Borger, W. Westmeier, H. Robotham, W. Ensinger, Severin, Daniel, M. Rossbah, B. Thomauske, Zamani, Masoud, Manolopoulou, Metaxia, S. Stoulos, M. Fragopolou, S. Jokic, Harphool Kumawat, V. Kumar, and M. Sharma
- Published
- 2010
- Full Text
- View/download PDF
14. Monte Carlo calculation for the geometrical efficiency of a multi-detector system for heavy ion reaction products
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S. Jokic, Alexandar Djordjevich, and Svetislav Savović
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Imagination ,Physics ,Chemical substance ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,Fission ,Projectile ,Applied Mathematics ,media_common.quotation_subject ,Monte Carlo method ,01 natural sciences ,multi-detector system ,0103 physical sciences ,heavy ion nuclear reactions ,Dynamic Monte Carlo method ,fission ,Atomic physics ,010306 general physics ,Nuclear Experiment ,Instrumentation ,Engineering (miscellaneous) ,Quotient ,Energy (signal processing) ,Monte Carlo simulation ,media_common - Abstract
The Monte Carlo method is employed to calculate the geometrical efficiency of a multi-detector system for fragments produced in heavy ion reactions. This efficiency is defined as a quotient of the number of fragments intercepted by the system and the total number of fragments emitted by the fissioning nucleus in all directions. The multi-detector system consists of six parallel-plate avalanche counters in a hexagonal configuration around the target. Its geometrical efficiency was calculated with respect to the Ar-36 + U-238 reaction at a 7 MeV/u projectile energy.
- Published
- 2010
15. Performance of a Pb-spallation target surrounded by a U-blanket during irradiations with 1.6 and 2.5 GeV deuteron beams: Comparison with relativistic proton beams
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M.I. Krivopustov, Stylianos Stoulos, M. Manolopoulou, A. N. Sosnin, S. Jokic, M. Fragopoulou, and M. Zamani-Valasiadou
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Physics ,Fission products ,Proton ,010308 nuclear & particles physics ,Fission ,Nuclear Theory ,chemistry.chemical_element ,Blanket ,01 natural sciences ,7. Clean energy ,Plutonium ,Nuclear physics ,Nuclear Energy and Engineering ,Deuterium ,chemistry ,0103 physical sciences ,Physics::Accelerator Physics ,Neutron ,Spallation ,Atomic physics ,010306 general physics ,Nuclear Experiment - Abstract
Neutron and proton yields. spatial and energy distributions were determined on an electronuclear set-up irradiated with relativistic deuteron beams. The experimental results, acquired using both passive and active methods, are compared with the data obtained using MC simulation. The U-blanket performance in terms of fission production rate as well as plutonium accumulation is discussed. An evaluation between the data obtained using relativistic deuteron and proton beams is presented regarding to study the set-up efficiency to incinerate and/or transmute the actinides and fission products. (C) 2009 Elsevier Ltd. All rights reserved.
- Published
- 2010
16. Interpretation of the 3-pronged events from the 238U+Au reaction registered within CR 39 solid state nuclear track detectors
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M. Debeauvais, J. Ralarosy, S. Jokic, F. Fernández, Z. Todorović, M. Zamani, and J.C. Adloff
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Physics ,Nuclear physics ,chemistry.chemical_compound ,Nuclear track ,chemistry ,Fission ,Detector ,Solid-state ,Context (language use) ,Atomic physics ,Kinetic energy ,CR-39 ,Interpretation (model theory) - Abstract
Reactions of 15 MeV/n 238 U on Au have been studied by means of CR 39 solid state nuclear track detectors. Among the different events observed, all 3-pronged events were selected and examined. It is found that at final state the quasi totality of these events, say 87%, proceed by fission reactions. Analysis in the context of participant-spectator model has shown evidence for two different fission processes. Fission events derived from the break-up of the participant nuclei represent ∼78% of the events, whereas ∼9% issue from the spectator. The mean kinetic energy loss is ∼11 % of the incident energy.
- Published
- 1991
17. Preliminary results on neutron production from a Pb/U target irradiated by deuteron beam at 1.25 GeV/amu
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Stylianos Stoulos, A. N. Sosnin, M. Fragopoulou, M. Manolopoulou, M. Zamani, S. Jokic, and M.I. Krivopustov
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Physics ,Nuclotron ,Radiation ,neutron distribution ,Physics::Instrumentation and Detectors ,Nuclear Theory ,01 natural sciences ,Neutron temperature ,Neutron time-of-flight scattering ,010305 fluids & plasmas ,030218 nuclear medicine & medical imaging ,Nuclear physics ,03 medical and health sciences ,0302 clinical medicine ,0103 physical sciences ,Neutron cross section ,Neutron source ,Neutron detection ,Physics::Accelerator Physics ,Neutron ,Nuclear Experiment ,Instrumentation ,spallation sources ,Spallation Neutron Source - Abstract
A spallation neutron source consisted of a cylindrical Pb target and surrounded by uranium blanket was irradiated by deuteron beam 1.25 GeV/amu provided from the Nuclotron accelerator at High Energy Laboratory, JINR, Dubna. For radiation protection purpose a polyethylene shielding was placed around the spallation neutron source. Neutron distributions along the surface of the U-blanket were measured by using solid state nuclear track detectors (SSNTDs) as particle and fission detectors. The neutron distributions appear to be similar to those obtained by proton irradiations. Applying a fitting procedure to the experimental data the inelastic cross section of deuteron in Pb was estimated. The escaping neutron distribution from the polyethylene shielding and parallel to the target was also measured and presented to be two orders of magnitude less than that over the U-blanket surface. (C) 2008 Elsevier Ltd. All rights reserved. 23rd International Conference on Nuclear Tracks in Solids, Sep 11-15, 2006, Shanxi Normal Univ, Inst Modern Phys, Beijing, Peoples R China
- Published
- 2008
18. Multifragment emission in reactions ofKr84on Ag and Au at 17.7, 27, and 35 MeV/nucleon
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J. Ralarosy, F. Fernández, M. Zamani, S. Jokic, Dimitrios Sampsonidis, J.C. Adloff, and M. Debeauvais
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Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Solid-state ,Nuclear physics ,chemistry.chemical_compound ,Angular distribution ,chemistry ,Fragmentation (mass spectrometry) ,Nuclear track ,Incident energy ,Atomic physics ,Nuclear Experiment ,CR-39 ,Nucleon - Abstract
CR 39 solid state nuclear track detectors have been used to study the reaction products of 17.7, 27, and 35 MeV/nucleon $^{84}\mathrm{Kr}$ on Au and Ag. The visual detectors allow studying interactions producing two or more correlated intermediate mass fragments in the final state. The characteristics of these events are such that they probably arise from a fragmentation process of the quasitarget or some intermediate zone. The cross sections of 3, 4, and (5+6) correlated fragments increase with increasing $^{84}\mathrm{Kr}$ incident energy for both targets.
- Published
- 1990
19. Measurement of 232Th(n,5nγ) cross sections from 29 to 42 MeV
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M. Kerveno, M. Reginatto, S. Lukic, E. Jericha, A. Nachab, S. Jokic, Ralf Nolte, A. Pavlik, P. Baumann, Jean-Pierre Meulders, Ph. Dessagne, and Gerard Rudolf
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Excitation function ,Physics ,Physics::Instrumentation and Detectors ,Fission ,Astrophysics::High Energy Astrophysical Phenomena ,Liquid scintillation counting ,Nuclear data ,Neutron radiation ,7. Clean energy ,Semiconductor detector ,Nuclear physics ,Time of flight ,Ionization chamber ,Atomic physics ,Nuclear Experiment - Abstract
The excitation function of the reaction 232 Th(n, 5nγ) 228 Th from 29 to 42 MeV has been measured for the first time at the quasi-monoenergetic neutron beam of the UCL cyclotron CYCLONE employing the 7 Li(p,n) source reaction. Taking advantage of the good energy resolution of the planar High Purity Germanium (HPGe) detectors, prompt γ-ray spectroscopy was used to detect the γ rays resulting from the decay of excited states of nuclei created by the (n,xn) reactions. The neutron beam was characterized by a combination of time of flight measurements carried out using a liquid scintillation detector and a 238 U fission ionization chamber and fluence measurements carried out using a proton recoil telescope. The preliminary results are compared with calculations performed using the TALYS-0.72 code.
- Published
- 2007
20. Filter Designs for VDSL Analog Front End
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S. Jokic, M. Bratulic, P. Jakovcic, N. Stojkovic, Sandoval, Francisco, Camacho, Carlos, and Puerta, Antonio
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Adaptive filter ,Filter design ,Control theory ,Electronic filter topology ,Electronic engineering ,Butterworth filter ,Network synthesis filters ,Active filter ,Digital filter ,Mathematics ,Root-raised-cosine filter ,VDSL ,analog front end ,analog filters ,sensitivity ,noise - Abstract
In the paper different fourth order filter designs with different transfer function approximations are discussed. Specifications on the filters are given for VDSL signal processing. Transfer functions and filter elements are given and sensitivity and noise for each design are calculated. The lowest sensitivity is obtained using a cascade of Rauch biquads, the lowest noise gives Akerberg-Mosberg design and the best selectivity is obtained using an elliptic filter. That leads to compromise in VDSL filter design. Also, transfer function approximation significantly determine overall specifications
- Published
- 2006
21. 207Pb(n,2nγ)206Pb Cross-Section Measurements by In-Beam Gamma-Ray Spectroscopy
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A. Pavlik, S. Jokic, L. C. Mihailescu, E. Jericha, G. Rudolf, M. Kerveno, A. J. M. Plompen, C. Borcea, Strahinja Lukić, and P. Baumann
- Subjects
Nuclear physics ,Physics ,Cross section (physics) ,Astrophysics::High Energy Astrophysical Phenomena ,Radiative capture ,Physics::Accelerator Physics ,Neutron ,Gamma spectroscopy ,Neutron radiation ,Nuclear Experiment ,Beam (structure) - Abstract
207Pb(n,2nγ)206Pb cross section were measured for incident neutron energies between 6 and 20 MeV with the white neutron beam produced at GELINA. The γ‐ray production cross section for the main transition (803 keV, 2+→ 0+) in 206Pb is compared to results obtained at Los Alamos and to the TALYS and EMPIRE‐II code predictions.
- Published
- 2006
22. Filters for VDSL technology
- Author
-
S. Jokic, M. Jusic, Nino Stojković, S. Basic, Boudriga, Noureddine, and Obaidat, Mohammad S.
- Subjects
Adaptive filter ,Signal processing ,Noise (signal processing) ,Low-pass filter ,Electronic engineering ,Filter (signal processing) ,analog filters ,Butterworth ,Chebyshev ,VDSL ,noise ,sensitivity ,Network synthesis filters ,Topology ,Chebyshev filter ,Linear filter ,Mathematics - Abstract
In this paper, different the third order filters designs with different transfer function approximations are discussed. The filters should fulfill the specifications for the VDSL signal processing. The standard transfer function approximations are chosen: the Butterworth, the Chebyshev, the Symmetric impulse response and the Elliptic. The filters are designed using the fully differential sections with the small number of elements to obtain the low noise and the high dynamic range, and the low sensitivity. The transfer functions and the filter elements are given and the sensitivity and the noise for each design are calculated. The best results are obtained for the third order filter where the second order block follow the first order block.
- Published
- 2005
23. Cross-Section Measurements for (n,xn) Reactions by In-Beam Gamma-Ray Spectroscopy
- Author
-
P. Baumann, C. Borcea, J. P. Meulders, M. Kerveno, S. Jokic, A. Pavlik, L. C. Mihailescu, Ralf Nolte, A. J. M. Plompen, E. Jericha, S. Lukic, I. Raškinytė, and G. Rudolf
- Subjects
Nuclear reaction ,Nuclear physics ,Chemistry ,Astrophysics::High Energy Astrophysical Phenomena ,Isotopes of lithium ,Nuclear Theory ,Neutron source ,Gamma spectroscopy ,Neutron ,Neutron radiation ,Nuclear Experiment ,Neutron temperature ,Isotopes of thorium - Abstract
The nuclear reactions 207Pb(n,2n)206Pb and 232Th(n,5n)228Th were studied by measuring prompt gamma‐ray emission spectra from the interaction of neutrons with an enriched 207Pb sample and a natTh sample. For 207Pb the measurements were performed at the white neutron beam of the GELINA neutron source at IRMM Geel in the neutron energy range up to 20 MeV. The Th measurements were done at the quasi‐monoenergetic 7Li(p,n)7Be neutron source at the Universite Catholique de Louvain for five peak neutron energies in the range 29 MeV to 42 MeV. The measurements were complemented by model calculations using the code system EMPIRE‐II.
- Published
- 2005
24. Prefission neutron multiplicities and the fission modes of Th-226
- Author
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Louise Stuttge, L. Donadille, M. G. Itkis, A. Huck, D. Vorkapic, B. Heusch, E. M. Kozulin, G. Guillaume, K. Yuasa-Nakagawa, E. de Goes Brennand, Yu. Ts. Oganessian, I. V. Pokrovsky, G. Rudolf, B. Benoit, N. A. Kondratiev, O. Dorvaux, S. Jokic, G.J. Costa, E. V. Prokhorova, A. Ya. Rusanov, Francis Hanappe, I. M. Itkis, and A. Kelic
- Subjects
Physics ,010308 nuclear & particles physics ,Fission ,Nuclear Theory ,General Physics and Astronomy ,Neutron spectra ,01 natural sciences ,7. Clean energy ,Coincidence ,Nuclear physics ,0103 physical sciences ,Neutron ,Atomic physics ,010306 general physics ,Nuclear Experiment - Abstract
The neutron spectra associated to the two fission modes of Th-226 have been measured in coincidence with the fragment yields of the O-18 + Pb-208 reaction at E-lab = 78 MeV. The pre- and post-fission multiplicities and temperatures have been extracted. Surprisingly, the prefission neutron multiplicities associated with the asymmetric mode are larger than those associated with the symmetric mode.
- Published
- 1999
25. Interaction of 12.7 GeV 4He ions with U, Pb, Au and Ag targets
- Author
-
Svetislav Savović, S. Jokic, and Ž. Todorović
- Subjects
Reaction mechanism ,Radiation ,010308 nuclear & particles physics ,Fission ,Chemistry ,associated spallation ,Makrofol detector ,multifragmentation ,Analytical chemistry ,chemistry.chemical_element ,Multiplicity (mathematics) ,01 natural sciences ,Ion ,Nuclear physics ,Fragmentation (mass spectrometry) ,0103 physical sciences ,fission ,Spallation ,010306 general physics ,Instrumentation ,Excitation ,Helium - Abstract
The processes of production of fragments Z greater than or equal to 8 in the interactions of 12.7 GeV He-4 with U, Pb, Au and Ag have been analyzed using the polycarbonate track detector Makrofol. A sandwich technique was used which enables direct evidence for multiple fragment emission by a single nucleus. The decay channels ending with one, two or more (three, four) fragments were detected. A classification scheme based on the multiplicity of heavy fragments M-H (Z GT 20) was used in order to identify events belonging to the different reaction channels. Cross sections, excitation energies and multiplicities of intermediate mass fragments (8 less than or equal to Z less than or equal to 20) have been evaluated for various reaction mechanisms. The experimental features of the fragmentation process have been analyzed as a function of the target mass. 18th International Conference on Nuclear Tracks in Solids, Sep 01-05, 1996, Cairo, Egypt
- Published
- 1997
26. High-Voltage Electric Discharge Extraction of Bioactive Compounds from the Cocoa Bean Shell
- Author
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S. Jokić, N. Pavlović, A. Jozinović, Đ. Ačkar, J. Babić, and D. Šubarić
- Subjects
cocoa bean shell ,by-product ,high-voltage electric discharge ,bioactive compounds ,Chemical engineering ,TP155-156 - Abstract
This study is focused on the application of high-voltage electric discharge (HVED) to recover some bioactive compounds from the cocoa bean shell. Different extraction times (30, 60, 90 min), frequencies (40, 70, 100 Hz) and solvent-solid ratios (10, 30 and 50 mL g–1) were used to obtain cocoa bean shell extracts. Desired bioactive compounds, methylxanthines and phenolic compounds were measured in obtained extracts by high-pressure liquid chromatography with diode array detector. The obtained extracts showed that theobromine was the most abundant, ranging from 2530.13 to 6031.51 mg kg–1, while caffeine content was in the range from 316.08 to 849.88 mg kg–1. In addition, significant amounts of phenolic compounds were found, namely catechin (115.91 to 284.33 mg kg–1), epicatechin (20.20 to 358.90 mg kg–1), and gallic acid (80.28 to 219.17 mg kg–1). Results showed that different parameters of HVED extraction have statistically significant influence on cocoa bean shell composition, suggesting how this byproduct can be used in the production of valuable extracts.
- Published
- 2019
- Full Text
- View/download PDF
27. Total reaction cross sections at relativistic energies
- Author
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V.S. Butsev, B.A. Kulakov, J. Ralarosy, M.I. Krivopustov, H.H. Cui, J.C. Adloff, M. Zamani, S. Jokic, F. Fernández, Y.H. Guo, M. Debeauvais, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette
- Subjects
Physics ,Nuclear physics ,Nuclear reaction ,Nuclear track ,Projectile ,Cr 39 detector ,Detector ,Nuclear cross section ,Track detectors ,Atomic physics ,Nuclear Experiment - Abstract
Total reaction cross sections of C-12, O-16 and Mg-24 projectiles were determined in several targets, by means of Nuclear Track Detectors. The beams at 4.5 GeV/N for C-12 and Mg-24 and 3.65 GeV/N for O-16 were taken from Dubna accelerator. Our results exhibit the geometrical dependence on nuclear radii. They are in good agreement with Vary's cross sections (Vary, 1975) taking the overlap parameter to be dependent on interacting masses.
- Published
- 1991
28. 2137 POSTER Post-mastectomy breast reconstruction complications – ten years experience
- Author
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A. Celebic, M. Prekajski, S. Jokic, O. Kosovac, M. Inic, I. Markovic, D. Stojiljkovic, R. Dzodic, and N. Miletic
- Subjects
Cancer Research ,medicine.medical_specialty ,Oncology ,Post mastectomy ,business.industry ,Medicine ,business ,Breast reconstruction ,Surgery - Published
- 2007
29. Three body events from Kr + Ag, Au systems at 17.7 MeV per nucleon
- Author
-
F. Fernández, S. Jokic, J.C. Adloff, M. Zamani, M. Debeauvais, and J. Ralarosy
- Subjects
Physics ,Particle physics ,Nucleon - Published
- 1990
30. Reactions of 10- and 16.7- MeV per nucleon 238U on 238U, 208Pb, 197Au and 12C recorded within 'SSNTD'
- Author
-
M. Debeauvais, J. Tripier, S. Jokic, and J. Ralarosy
- Subjects
Nuclear physics ,Physics ,Fission ,Radiochemistry ,General Engineering ,Ternary operation ,Nucleon ,Ion - Abstract
Makrofol and cellulose nitrate detectors were used to study the reactions of 2.38 and 3.97 GeV 238 U on heavy targets like 238 U, 208 Pb and 197 Au. Binary, ternary and quaternary fission of the incident ions in reactions with the 12 C of the detectors were also abserved. Branching ratios of multipronged events induced by the heavy targets were determined, as were mass and folding angle distributions for the fission events induced by 12 C.
- Published
- 1984
31. Multi-fragment events in Kr + Ag interactions at 17.7 and 35 MeV/n
- Author
-
F. Fernández, M. Debeauvais, M. Zamani, S. Jokic, and J. Ralarosy
- Subjects
Physics ,chemistry.chemical_compound ,chemistry ,Fragment (computer graphics) ,Track (disk drive) ,Atomic physics ,CR-39 ,Event analysis ,Event (particle physics) ,Solid-state nuclear track detector - Abstract
CR 39 was used as Solid State Nuclear Track Detector (SSNTD) to study the reactions of 17.7 and 35 MeV/n Kr on Ag targets. Cross-sections of each kind of multi-pronged event were calculated and the charge and velocity distributions of the heavy fragments were determined by the calibration of each track from an event by event analysis.
- Published
- 1988
32. Electrochemically developed α-particle tracks in CN-85 cellulose nitrate
- Author
-
Dimitrios Sampsonidis, M. Zamani, F. Fernández, S. Jokic, M. Debeauvais, and J. Ralarosy
- Subjects
Physics ,Nuclear and High Energy Physics ,Tree (data structure) ,chemistry.chemical_compound ,Nitrate ,chemistry ,Track (disk drive) ,Analytical chemistry ,Cellulose ,Electrochemical etching ,Instrumentation ,α particles ,Fluence - Abstract
Several parameters influencing tree formation in electrochemical etching of α-particle tracks in CN-85 cellulose nitrate have been studied. A dependence of track diameter on incident α-particle energy and fluence is found.
- Published
- 1986
33. CR-39 Registration Efficiency of Protons Using Electrochemical Etching
- Author
-
F. Fernández, C. Baixeras, M. Zamani, D. López, S. Jokic, M. Debeauvais, and J. Ralarosy
- Subjects
Radiation ,Radiological and Ultrasound Technology ,Public Health, Environmental and Occupational Health ,Radiology, Nuclear Medicine and imaging ,General Medicine - Published
- 1988
34. Evidence of a new type of fission within a solid state nuclear detector
- Author
-
M. Debeauvais, S. Jokic, J. Tripier, J. Ralarosy, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Cold fission ,Nuclear fission product ,Materials science ,Fission ,Nuclear Theory ,heavy ion nucleus reactions ,Fission product yield ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,10 MeV n U ions ,Nuclear physics ,Physics::Atomic and Molecular Clusters ,fission ,Au ,Nuclear Experiment ,Computer Science::Databases ,Pb ,Fission products ,Cluster decay ,nuclei with mass number 220 or higher ,General Engineering ,food and beverages ,fission of uranium ,particle detectors ,[PHYS.HIST]Physics [physics]/Physics archives ,solid state nuclear detector ,delayed fission ,Long-lived fission product ,Delayed neutron - Abstract
An SSNTD study of reactions induced by 10 MeV/n U ions on U, Au and Pb targets led to the observation of a new type of fission event which can be explained as a delayed fission.
- Published
- 1982
35. Model of Three-Limb Three-Phase Transformer Based on Nonlinear Open Circuit Characteristic with Experimental Verification
- Author
-
M. Simić, T. B. Šekara, and S. Jokić
- Subjects
harmonic analysis ,nonlinear open-circuit characteristic ,transformers ,Telecommunication ,TK5101-6720 - Abstract
This paper describes the realization of a three-phase transformer model based on a non-linear open-circuit characteristic. The proposed model is based on the fact that in case of a star connection with a neutral wire on the primary windings for all three phases, the applied voltage presents phase voltage and line (phase) currents are magnetization currents. These variables are available for measuring and it is easy to obtain three non-linear open circuit characteristics. The results of simulations and a comparison with references and experimental results verified this approach.
- Published
- 2014
36. Reaction cross-section of 3.7 GeV/n 12C + Cu, Pb and 1.8 GeV/n 40Ar + Cu studied by the SSNTD technique
- Author
-
J.C. Adloff, S. Jokic, F. Fernández, M. Zamani, M. Debeauvais, and J. Ralarosy
- Subjects
Nuclear physics ,Physics ,Cross section (physics) ,chemistry.chemical_compound ,chemistry ,Irradiation ,Track detectors ,CR-39 ,Beam (structure) ,Ion - Abstract
Cu and Pb targets were irradiated by 3.7 GeV/n 12 C ions and 1.8 GeV/n ions respectively at the Dubna (USSR) and Berkeley (USA) accelerators. CR 39 track detectors were placed up- and downstream of 2.0 cm Cu and 0.8 cm Pb foils. Important attenuation of the number of beam particles passing through the targets was observed allowing for direct total reaction cross section measurements. Good agreement with theoretically calculated cross section was found.
- Published
- 1988
37. Evaluation of a Document Oriented Resource Directory Performance
- Author
-
N. Gligorić, J. Vučković, I. Dejanović, S. Krčo, S. Jokić, and D. Drajić
- Subjects
Document oriented databases ,future Internet ,IoT ,native XML databases ,relational databases ,resources ,Telecommunication ,TK5101-6720 - Abstract
In this paper, two implementations of a Resource Directory based on document oriented databases are described. Resource Directory is a directory storing descriptions of resources available in an Internet of Things system. Their performances are compared with performance of a Resource Directory with the same functionality, but implemented using a relational, SQL database. The evaluation results show that the document based Resource Directories provide more flexible management of the resources and a shorter response time.
- Published
- 2012
38. The Impact of Telephone Channels on the Accuracy of Automatic Speaker Recognition
- Author
-
V. Delić, M. Sečujski, M. Gnjatović, S. Jokić, and I. Jokić
- Subjects
Automatic speaker recognition ,experimental study ,telephone channel ,echo in VoIP ,adaptation ,Telecommunication ,TK5101-6720 - Abstract
This paper presents an experimental study on the impact of telephone channels on the accuracy of automatic speaker recognition. Speaker models and the design of the recognizer used in this study are based on Hidden Markov models. In order to simulate telephonequality speech signals, several experimental conditions were introduced taking two control factors into consideration: the type of the applied codec and the probability of transmission errors. In addition, the impact of echo signals – that are often present in Internet telephony – on the accuracy of automatic speaker recognition systems is considered. Finally, the paper provides a brief overview of several methodologies for the adaptation of the recognizer to the expected environmental conditions that may enhance the robustness of the speaker recognizer.
- Published
- 2011
39. Fission of U, Th, Bi, Pb and Au induced by 200 and 300 GeV protons
- Author
-
M. Debeauvais, S. Jokic, Z. Todorović, R. Antanasijevic, J. Tripier, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette
- Subjects
Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Cluster decay ,010308 nuclear & particles physics ,Fission ,Thorium ,chemistry.chemical_element ,Actinide ,Uranium ,01 natural sciences ,[PHYS.PHYS.PHYS-CHEM-PH] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Nuclear physics ,chemistry ,0103 physical sciences ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Nuclear Experiment ,010306 general physics ,Ternary fission ,Ternary operation - Abstract
The cross sections for the binary and ternary fission of U, Th, Bi, Pb, and Au induced by 300 GeV protons have been measured with Makrofol polycarbonate detectors. We deduce that the ternary events and most of the binary events with a projected angle ..cap alpha../sub 12/
- Published
- 1981
40. A comparative study of methods to determine the alpha-particle track density in different SSNT detectors
- Author
-
C. Baixeras, M. Zamani, J. Ralarosy, S. Jokic, M. Debeauvais, F. Fernández, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette
- Subjects
Materials science ,Optics ,Physics::Instrumentation and Detectors ,business.industry ,Spark (mathematics) ,Detector ,Analytical chemistry ,Alpha particle ,Irradiation ,Track detectors ,business ,Track density - Abstract
For a convenient utilization of the track detectors, two techniques are investigated: standard optical system and spark counting. Results for the counting characteristics as a function of the irradiation parameters are given for the makrofol E and cellulose nitrate LR115 type II detectors for the experimental conditions used. The efficiency of detection is given.
- Published
- 1986
41. Fission of $^{238}$U projectiles induced by a $^{12}$C target
- Author
-
S. Jokic, J. Ralarosy, M. Debeauvais, J. Tripier, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette
- Subjects
Physics ,Materials science ,Mass distribution ,Physics::Instrumentation and Detectors ,Fission ,Projectile ,Nuclear Theory ,Detector ,General Medicine ,[PHYS.PHYS.PHYS-CHEM-PH] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Nuclear physics ,Cross section (physics) ,Recoil ,medicine.anatomical_structure ,medicine ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Atomic physics ,Nuclear Experiment ,Nucleus - Abstract
The 12C contained in a makrofol detector was bombarded by 2.38 GeV 238U projectiles. The characteristics of the binary fission were studied. It is shown that the cross section is ≃ 1 b, that the mass distribution is only slightly asymmetric and that the most probable fissioning recoil nucleus is (Z,M) = (96,240).
- Published
- 1981
42. A study of electrochemical etched $\alpha$ and proton tracks in CR-39 as function of energy
- Author
-
M. Debeauvais, F. Fernández, S. Jokic, M. Zamani, J. Ralarosy, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette
- Subjects
Mean diameter ,chemistry.chemical_compound ,Proton ,Physics::Plasma Physics ,Chemistry ,Alpha (ethology) ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Atomic physics ,Electrochemistry ,CR-39 ,Energy (signal processing) ,[PHYS.PHYS.PHYS-CHEM-PH] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] - Abstract
A study of ECE conditions for α-particles and protons registered in CR-39 were attempted. For alphas, a dependence of the mean diameter on energy was obtained. In the case of protons, only slight influence of energy on mean diameter was observed. For the conditions used, the efficiency of the ECE development is given.
- Published
- 1986
43. ETUDE A L'AIDE DU MAKROFOL DES INTERACTIONS U SUR U ET Pb A DES ENERGIES SUPERIEURES A 7 MeV/UMA
- Author
-
M. Debeauvais, S. Jokic, and J. Tripier
- Subjects
Nuclear physics ,Physics ,0103 physical sciences ,010306 general physics ,01 natural sciences ,010305 fluids & plasmas - Abstract
By means of makrofol detector we have studied the reaction U + U at 9.02 MeV/AMU and 7.5 MeV/AMU and U + Pb at 7.5 MeV/AMU. We analyse 3, 4 and 5 pronged events and give the cross sections and some geometrical and cinematical properties.
- Published
- 1980
44. FISSION CROSS SECTIONS OF HEAVY NUCLEI INDUCED BY 300 GeV PROTONS WITH THE HELP OF PLASTIC DETECTOR
- Author
-
M. Debeauvais, J. Tripier, and S. Jokic
- Subjects
Physics ,Cluster decay ,Proton ,Physics::Instrumentation and Detectors ,Fission ,Nuclear Theory ,Proportional counter ,Nuclear physics ,Cross section (physics) ,Physics::Accelerator Physics ,Irradiation ,Atomic physics ,Nuclear Experiment ,Ternary fission ,Beam (structure) - Abstract
Thin targets of heavy elements are sandwiched between sheets of polycarbonate detectors. These makrofolstacks were irradiated with 300 GeV protons at FNAL and permitted the registration in 4π geometry of all the fission fragments in correlation. The incoming proton beam intensity were made by measuring 24 Na produced in Al foil with a calibrated proportional counter and so we have obtained the binary and ternary fission cross section of U, Th and Bi. A new kind of event, the break up of the nucleus in 4 fragments was found and studied.
- Published
- 1978
45. Production of fragments in 4He+197Au reaction at 12.7 GeV
- Author
-
S. Jokic, Ž. Todorović, and Svetislav Savović
- Subjects
Nuclear physics ,Radiation ,chemistry ,Fragmentation (mass spectrometry) ,Fission ,chemistry.chemical_element ,Spallation ,Classification scheme ,Multiplicity (chemistry) ,Instrumentation ,Helium - Abstract
The emission of fragments ( A ≥16) from reaction of 4 He with 197 Au has been studied at bombarding energy of 12.7 GeV. Policarbonate Makrofol in sandwich form was used as a detector. Fragments produced in the experiment were identified and an event by event model-free analysis was performed. The decay channels ending with one, two or more (three, four) fragments were detected. A classification scheme based on the multiplicity ( M H ) of heavy fragments ( A ≥40) was used in order to define multifragmentation ( M H = 0), spallation ( M H = 1) and fission ( M H = 2) events. The various experimental features of the fragmentation process are discussed.
46. TripletCough: Cougher Identification and Verification From Contact-Free Smartphone-Based Audio Recordings Using Metric Learning.
- Author
-
Jokic S, Cleres D, Rassouli F, Steurer-Stey C, Puhan MA, Brutsche M, Fleisch E, and Barata F
- Subjects
- Algorithms, Cough diagnosis, Humans, Neural Networks, Computer, Respiration Disorders, Smartphone
- Abstract
Cough, a symptom associated with many prevalent respiratory diseases, can serve as a potential biomarker for diagnosis and disease progression. Consequently, the development of cough monitoring systems and, in particular, automatic cough detection algorithms have been studied since the early 2000s. Recently, there has been an increased focus on the efficiency of such algorithms, as implementation on consumer-centric devices such as smartphones would provide a scalable and affordable solution for monitoring cough with contact-free sensors. Current algorithms, however, are incapable of discerning between coughs of different individuals and, thus, cannot function reliably in situations where potentially multiple individuals have to be monitored in shared environments. Therefore, we propose a weakly supervised metric learning approach for cougher recognition based on smartphone audio recordings of coughs. Our approach involves a triplet network architecture, which employs convolutional neural networks (CNNs). The CNNs of the triplet network learn an embedding function, which maps Mel spectrograms of cough recordings to an embedding space where they are more easily distinguishable. Using audio recordings of nocturnal coughs from asthmatic patients captured with a smartphone, our approach achieved a mean accuracyof 88 % ( ± 10 % SD) on two-way identification tests with 12 enrollment samples and accuracy of 80 % and an equal error rate (EER) of 20 % on verification tests. Furthermore, our approach outperformed human raters with regard to verification tests on average by 8% in accuracy, 4% in false acceptance rate (FAR), and 12% in false rejection rate (FRR). Our code and models are publicly available.
- Published
- 2022
- Full Text
- View/download PDF
47. Hyperthermic intrathoracic chemotherapy (HITHOC) in ovarian carcinoma - a propos of a case.
- Author
-
Stojiljkovic D, Nikolic S, Cvetkovic A, Jokic V, Spurnic I, Jokic S, Goran M, Kocic M, Miletic N, Filipovic J, Stojiljkovic T, and Lukac B
- Subjects
- Adult, Combined Modality Therapy, Female, Humans, Ovarian Neoplasms pathology, Peritoneal Neoplasms secondary, Prognosis, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Chemotherapy, Cancer, Regional Perfusion methods, Hyperthermia, Induced methods, Ovarian Neoplasms therapy, Peritoneal Neoplasms therapy
- Abstract
A female patient aged 42, started chemotherapy for advanced ovarian carcinoma in June 2016. Considering intraoperative findings, cytoreductive surgery with hyperthermic intraperitoneal chemotherapy (HIPEC) were performed, followed by adjuvant chemotherapy. In March 2018, computed tomography (CT) examination showed disease progression in the form of pleural carcinomatosis with increased levels of tumor markers. In April 2018, total parietal pleurectomy, partial visceral pleurectomy, and then hyperthermic intrathoracic chemotherapy (HITHOC) with cisplatin were performed. The procedure was uneventful, as was the postoperative course. The patient was discharged on the 13th postoperative day with no major postoperative complications. Three months after surgery, CT showed no signs of disease relapse. Since this is a relatively new method of treating pleural carcinomatosis, real results are to be expected with larger series of patients and longer postoperative follow-up.
- Published
- 2018
48. Predictors of sentinel lymph node status of cutaneous melanoma in Serbian patients.
- Author
-
Jokic S, Markovic I, Bukumiric Z, Jokic V, Rakovic M, Tripkovic J, Stojiljkovic D, Spurnic I, Jevric M, Matic M, and Dobrosavljevic D
- Subjects
- Adult, Female, Humans, Kaplan-Meier Estimate, Lymphatic Metastasis, Male, Melanoma epidemiology, Melanoma pathology, Middle Aged, Neoplasm Recurrence, Local epidemiology, Neoplasm Recurrence, Local pathology, Sentinel Lymph Node Biopsy, Serbia epidemiology, Skin Neoplasms epidemiology, Skin Neoplasms pathology, Melanoma, Cutaneous Malignant, Melanoma diagnosis, Neoplasm Recurrence, Local diagnosis, Prognosis, Sentinel Lymph Node pathology, Skin Neoplasms diagnosis
- Abstract
Purpose: Presence of metastasis in sentinel lymph node (SLN) is considered to be the most important factor in terms of patient survival. The main aim of this study was to identify predictors of positive SLN in Serbian patients with melanoma., Methods: This retrospective study was conducted on 147 patients. Univariate chi-square and univariate logistic regression analyses were used to identify the association between prognostic factors and positive SLN. Receiver Operating Characteristics (ROC) was conducted to find the Breslow thickness cutoff point at which to perform SLN biopsy (SLNB). Kaplan-Meier analysis was used to evaluate disease-free survival (DFS), and log rank test was applied to compare differences between groups., Results: Breslow thickness and Clark level (p≤0.05), presence of ulceration and a high mitotic rate (>6 mitoses/mm
2 ) (p<0.001) were significant independent predictors of SLN metastasis. ROC curve showed that Breslow thickness of 2.8 mm was the most suitable cutoff point for SLN positivity (sensitivity 86%, specificity 67%). Furthermore, Breslow thickness and presence of ulceration were found to be associated with DFS (p<0.05)., Conclusions: Patients with Breslow thickness ≥2.8 mm, ulceration, and high mitotic rate are at higher risk for SLN metastasis. In addition, high Breslow thickness and presence of ulceration are associated with decreased DFS. These results indicate that multiple selection criteria should be used when performing and predicting SLN metastasis and disease recurrence.- Published
- 2018
49. Errors detected in pediatric oral liquid medication doses prepared in an automated workflow management system.
- Author
-
Bledsoe S, Van Buskirk A, Falconer RJ, Hollon A, Hoebing W, and Jokic S
- Subjects
- Administration, Oral, Child, Drug Compounding methods, Hospitals, Pediatric standards, Humans, Medical Records Systems, Computerized standards, Pharmaceutical Solutions adverse effects, Professional Role, Drug Compounding standards, Medication Errors prevention & control, Pharmaceutical Solutions standards, Pharmacists standards, Pharmacy Service, Hospital standards, Workflow
- Abstract
Purpose: The effectiveness of barcode-assisted medication preparation (BCMP) technology on detecting oral liquid dose preparation errors., Methods: From June 1, 2013, through May 31, 2014, a total of 178,344 oral doses were processed at Children's Mercy, a 301-bed pediatric hospital, through an automated workflow management system. Doses containing errors detected by the system's barcode scanning system or classified as rejected by the pharmacist were further reviewed. Errors intercepted by the barcode-scanning system were classified as (1) expired product, (2) incorrect drug, (3) incorrect concentration, and (4) technological error. Pharmacist-rejected doses were categorized into 6 categories based on the root cause of the preparation error: (1) expired product, (2) incorrect concentration, (3) incorrect drug, (4) incorrect volume, (5) preparation error, and (6) other., Results: Of the 178,344 doses examined, 3,812 (2.1%) errors were detected by either the barcode-assisted scanning system (1.8%, n = 3,291) or a pharmacist (0.3%, n = 521). The 3,291 errors prevented by the barcode-assisted system were classified most commonly as technological error and incorrect drug, followed by incorrect concentration and expired product. Errors detected by pharmacists were also analyzed. These 521 errors were most often classified as incorrect volume, preparation error, expired product, other, incorrect drug, and incorrect concentration., Conclusion: BCMP technology detected errors in 1.8% of pediatric oral liquid medication doses prepared in an automated workflow management system, with errors being most commonly attributed to technological problems or incorrect drugs. Pharmacists rejected an additional 0.3% of studied doses., (Copyright © 2018 by the American Society of Health-System Pharmacists, Inc. All rights reserved.)
- Published
- 2018
- Full Text
- View/download PDF
50. Factors related to local recurrence of non small cell lung cancer and its operability.
- Author
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Stojiljkovic D, Santrac N, Goran M, Stojiljkovic T, Miletic N, Gavrilovic D, Spurnic I, Jevric M, Jokic S, and Markovic I
- Subjects
- Adult, Aged, Carcinoma, Non-Small-Cell Lung mortality, Carcinoma, Non-Small-Cell Lung pathology, Disease-Free Survival, Female, Humans, Male, Middle Aged, Neoplasm Recurrence, Local mortality, Neoplasm Recurrence, Local pathology, Carcinoma, Non-Small-Cell Lung surgery, Neoplasm Recurrence, Local surgery
- Abstract
Purpose: To analyze the correlation of primary tumor (PT) pathological characteristics (size, stage, type and grade) and the extent of initial surgical treatment of non small cell lung cancer (NSCLC) with the incidence and time to local recurrence (LR) and disease-free survival (DFS), as well as to determine in what way these parameters and LR localizations affect the possibility for surgical retreatment., Methods: The research was conducted on 114 patients with NSCLC and LR that had initial surgery in two reference institutes in Serbia from January 2002 to December 2010. PT size and disease stage were defined according to the revised 2004 WHO classification. PTs were grouped by size into 3 categories. Due to great diversity, surgical procedures were sorted into 6 operation types. Standard statistical methods and tests were used for data analysis., Results: Statistical analyses showed significant difference in DFS and LR reoperability that were related to PT size, disease stage and the extent of initial surgery. LR localization on the chest wall was favorable for secondary surgery due to LR., Conclusions: Squamous cell lung carcinoma relapses locally more frequently than other lung tumor types, and the commonest LR site is the chest wall. This localization provides high possibility for surgical retreatment. Adequate staging, proper indications for surgical treatment and quality surgery provide longer DFS in patients with NSCLC. All these suggest that the surgeon may be considered as the most significant factor of prognosis.
- Published
- 2016
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