19 research outputs found
Spatial distribution of multielements including lanthanides in sediments of Iron Gate I Reservoir in the Danube River
Recent studies show that lanthanides (Ln) are becoming emerging pollutants due to their wide application in new technologies,but their environmental fate, transport, and possible accumulation are still relatively unknown. This study aims to determinemajor and trace elements including Ln in the Danube River sediment which either belong or close to the Iron Gate Reservoir. TheIron Gate Reservoir is characterized by accumulation of sediments as an effect of building hydropower dam Iron Gate I. Thesurface sediments were collected on the Danube River—1141 to 864 km and three tributaries along this waterway. Two samplesof deep sediments were used for comparison. The results indicate the significant upward enrichment of Zn, Sb, Cr, Nd, and Dy insediments belongs to the Iron Gate Reservoir. The sample 4-Smed is labelled as a hot spot of contamination with Zn, Cr, As, Sb,Nd, and Dy. Also, a trend of increasing concentration in the time period from 1995 to 2016 was found for elements Zn, Cr, and Niin sediment samples in the Iron Gate Reservoir. Chemometric analysis shows the grouping of sample sites into clusters charac-terized by the following properties: (i) increased concentration of all measured elements (samples within the Iron Gate Reservoir);(ii) increased Cu concentration (11-Pek); and (iii) lower concentrations of the measured elements (deep sediments). The datapresented hereby contribute to the monitoring of pollution of the River Danube sediments and give the first view of Ln profile inthe studied sediments
Transmission Studies With Ion Beams Within FAMA
FAMA is a user facility for materials science with low-energy ion beams in the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. It includes a heavy ion source, a light ion source, two channels for modification of materials, and two channels for analysis of materials. Recently, the designing of a channel for transmission studies within FAMA has begun. The initial studies to be undertaken in this channel are related to the rainbow e ffects with very thin electrostatic lenses and two-dimensional materials.27th Russian Particle Accelerator Conference (RuPAC'21), Alushta, Russia, 27 September-01 October 202
Instrumental neutron activation for analysis of spatial distribution of heavy metals in surface sediments of the Danube River
In this paper, the spatial distribution of the heavy metals including technology-critical elements (TCE) in the surface river sediments was investigated. The surface sediments of the Danube River in the Republic of Serbia, as well as three tributaries were analysed. Instrumental neutron activation analysis (INNA) has been applied for quantification of the selected element in the samples. The main featues of INAA are: simultaneously determining more than 40 elements with high sensitivity and low detection limit, high selectivity due to specific nuclear reaction for each element, the nondestructive method, the sample stays intact and no chemical separation treatment is involved, simple sample preparation step, especially solid samples, a small quantity of sample (≈ 200 μg) and determination of the total element concentration independent of chemical species, real total analysis since the test portion does not have to be dissolved. The heavy metal concentration in the sediments connected with hydropower dam and accumulation of sediments in the reservoir systems Iron gate I and Iron gate II were discussed. Surface river sediments were collected from the river bottom at the central and the deepest part using an Ekman grab sampler and air-dried in a thin layer in the dark at room temperature (23 ± 1 °C). Also, deep river sediments (1.5 and 7 m) were collected and used for comparison purpose. After drying, the samples were homogenized using a pestle and mortar and sieved through a 1-mm sieve to ensure sample homogeneity. INAA were used to quantify following elements: Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Ga, As, Se, Yr, Ag, Cd, Sb, La, Ce. Nd, Sm, Eu, Gd, Tb, Dy, Tm, Yb, Th, Hf, Ta, W, Au, Hg and U. Irradiations were performed at the pulsed reactor IBR 2 (Frank Laboratory of Neutron Physics, JINR, Dubna, Russian Federation) using epithermal neutrons. Principal Component Analysis (PCA) and Power transformation as a pretreatment method were applied for analysis of experimental data. It was found that the increase in the amount of sediment in the reservoir prior to the dam Iron gate I was accompanied by an increase in the concentration of the following metals: antimony, arsenic, chromium, europium, neodymium and samarium.VII International Conference on Radiation in Various Fields of Research : RAD 2019 : book of abstracts; June 10-14, 2019; Herceg Novi, Montenegr
Archaeometry in Serbia: Where We Are and Where We Should Go Next?
The paper presents a short history of archaeometry investigations in Serbia, from the first published work in 1932 until today. It then describes the most important laboratories and institutions that perform archaeometry investigations in Serbia today, their teams, equipment, projects, and cooperation: Institute for the Protection of Cultural Monuments of Serbia, Vinča Institute of Nuclear Sciences, Faculty of Physical Chemistry, National Museum of Serbia, Institute of Archaeology, the Heritage Lab, Gallery of Matica Srpska Novi Sad, and City Museum of Subotica. The paper describes plans for the future and proposes forming of Serbian Society for Archaeometry with several goals: to further interconnect research disciplines; to facilitate better use and purchase of equipment, to establish a dedicated laboratory for archaeometry; to introduce archaeometry study programs at different levels of teaching; to introduce archaeometry into scientific plans of Serbia; to start a domestic archaeometry journal, and to promote the awareness of the potentials and benefits of archaeometry to institutions dealing with cultural heritage and to the general public
Remote controla of the PVINIS Ion-Source
XLIII Konferencija za elektroniku, telekomunikacije, racunarstvo, automatiku i nuklearnu tehniku - ETRAN; Zlatibor (Yugoslavia); 20-22 Sep 1999
Savremene naučne metode ispitivanja artefakata kulturnog nasleđa
3. godišnja konferencija ''Nauka i baština'' : Decembar, 2013, Beograd
Гетерогенный иерархический модель управления установкой для модификации и анализа материалов с помочей ионных пучков – ФАМА
Na postrojenju za modifikaciju i analizu materijala pomoću jonskih snopova FAMA, heuristički se određuju optimalne vrednosti kontrolnih parametara transporta za svaki jonski snop posebno. Sa ciljem ubrzavanja ovog sporog postupka, razvijen je model kontrole transporta jonskih snopova, odnosno modelovana je zavisnost između kontrolnih parametara i anvelope jonskog snopa. Model kontrole transporta proširen je zatim elementima dijagnostike jonskog snopa, koji su integrisani sa modelom kontrole u jedinstveni model.
Izgrađeni model je heterogen, u tom smislu da sadrži modele računanja sinhronog toka podataka i diskretnih događaja, i hijerarhijski, u tom smislu da su komponente raspoređene na šest hijerarhijskih nivoa apstrakcije modela. Model se može izvršavati u dva režima izvršavanja: (a) jednostrukom, za pojedinačni korak u optimizaciji transporta i (b) višestrukom, za dijagnostiku, kada svako izvrašavanje računa trajektoriju jedne čestice jonskog snopa. Model je isproban na primeru optimizacije kontrolih parametara za jonski snop 60 keV N4+.
Model je izgrađen pomoću okvira za heterogeno modelovanje Ptolemy II, koji omogućava integraciju komponenti sa različitim modelima računanja. U ovom okviru osnovnu izvršnu jedinicu čini aktor, dok semantiku modela implementira direktor, realizujući na taj način model računanja.
Glavni doprinosi teze su: (1) izgrađen model objekta upravljanja, (2) izgrađen model njegove kontrole, (3) izgrađen model dijagnostike jonskih snopova i (4) dobijen višenamenski alat za optimizaciju kontrolnih parametara, modelovanje dijagnostike jonskih snopova i obuku operatora.At the facility for modification and analysis of materials with ion beams (FAMA), the optimal values of ion beam transport control parameters are determined heuristically for each ion beam separately. To accelerate this slow process, the model of ion beam control is developed by modeling the dependence between ion beam control parameters and ion beam envelope. The model of the control is then enhanced with ion beam diagnostic elements, which are integrated into the single model. The obtained model is heterogenous, in the sense that it contains the synchronous data flow and the discrete event models of computation, and hierarchical, in the sense that its components are distributed over six levels of the hierarhical abstraction. The model can be executed in two modes: (a) single execution, for a single control optimization step, and (b) itterative, for diagnostics, where each execution of the model computes a single trajectory comprising the modelled ion beam. The model is tested by optimizing the control parameters for transport of the selected ion beam of 60 keV N4+. The model is built by the Ptolemy II framework, which enables the integration of components that implement different models of computation. In this framework, the actor represents the basic execution unit, while the director is responsible of implementing the semantics of the model, realizing in this way a particular model of computation. The main contributions of the thesis are: (1) built model of the physical object, (2) built model of its control, (3) built model of ion beam diagnostics, and (4) obtained multi-functional tool that can be used for the optimization of control parameters, ion beam diagnostics and operator training
Гетерогенный иерархический модель управления установкой для модификации и анализа материалов с помочей ионных пучков – ФАМА
Na postrojenju za modifikaciju i analizu materijala pomoću jonskih snopova FAMA, heuristički se određuju optimalne vrednosti kontrolnih parametara transporta za svaki jonski snop posebno. Sa ciljem ubrzavanja ovog sporog postupka, razvijen je model kontrole transporta jonskih snopova, odnosno modelovana je zavisnost između kontrolnih parametara i anvelope jonskog snopa. Model kontrole transporta proširen je zatim elementima dijagnostike jonskog snopa, koji su integrisani sa modelom kontrole u jedinstveni model.
Izgrađeni model je heterogen, u tom smislu da sadrži modele računanja sinhronog toka podataka i diskretnih događaja, i hijerarhijski, u tom smislu da su komponente raspoređene na šest hijerarhijskih nivoa apstrakcije modela. Model se može izvršavati u dva režima izvršavanja: (a) jednostrukom, za pojedinačni korak u optimizaciji transporta i (b) višestrukom, za dijagnostiku, kada svako izvrašavanje računa trajektoriju jedne čestice jonskog snopa. Model je isproban na primeru optimizacije kontrolih parametara za jonski snop 60 keV N4+.
Model je izgrađen pomoću okvira za heterogeno modelovanje Ptolemy II, koji omogućava integraciju komponenti sa različitim modelima računanja. U ovom okviru osnovnu izvršnu jedinicu čini aktor, dok semantiku modela implementira direktor, realizujući na taj način model računanja.
Glavni doprinosi teze su: (1) izgrađen model objekta upravljanja, (2) izgrađen model njegove kontrole, (3) izgrađen model dijagnostike jonskih snopova i (4) dobijen višenamenski alat za optimizaciju kontrolnih parametara, modelovanje dijagnostike jonskih snopova i obuku operatora.At the facility for modification and analysis of materials with ion beams (FAMA), the optimal values of ion beam transport control parameters are determined heuristically for each ion beam separately. To accelerate this slow process, the model of ion beam control is developed by modeling the dependence between ion beam control parameters and ion beam envelope. The model of the control is then enhanced with ion beam diagnostic elements, which are integrated into the single model. The obtained model is heterogenous, in the sense that it contains the synchronous data flow and the discrete event models of computation, and hierarchical, in the sense that its components are distributed over six levels of the hierarhical abstraction. The model can be executed in two modes: (a) single execution, for a single control optimization step, and (b) itterative, for diagnostics, where each execution of the model computes a single trajectory comprising the modelled ion beam. The model is tested by optimizing the control parameters for transport of the selected ion beam of 60 keV N4+. The model is built by the Ptolemy II framework, which enables the integration of components that implement different models of computation. In this framework, the actor represents the basic execution unit, while the director is responsible of implementing the semantics of the model, realizing in this way a particular model of computation. The main contributions of the thesis are: (1) built model of the physical object, (2) built model of its control, (3) built model of ion beam diagnostics, and (4) obtained multi-functional tool that can be used for the optimization of control parameters, ion beam diagnostics and operator training
Sixth-century AD glassware from Jelica, Serbia — an increasingly complex picture of late antiquity glass composition
In this paper, the chemical analyses of forty-two samples of glassware from the sixth to early seventh century AD Byzantine settlement of Gradina on Jelica, Serbia are reported, completing the previous study of forty windowpane samples from the same site. Apart from a single plant ash glass, all other glasses are natron-based, classified as Foy 2.1 (thirty-four), Foy 3.2 (six), and Roman (two). The ten colourless glasses from the assemblage are decolourised with manganese. Five glasses are intentionally coloured blue with cobalt and copper, one black with iron. Four blue glasses are opacified, one with antimony, one perhaps with tin. Some Jelica glass finds classified as Foy 3.2 are specific for having magnesium levels above those characteristic for série 3.2. Jelica glasses assigned to Foy 2.1 group were further divided into low iron (twenty), high iron (four), and very high iron (six) subgroups. The overall compositional pattern of Jelica samples identified as Foy 2.1 suggest that different sands with different heavy mineral suites and sources of lime were used in their making, as well as different levels of recycling. Our findings indicate that the reasons for the compositional blurring of Foy 3.2 and Foy 2.1 are not limited to technological reasons such as recycling, but also include variations in the sand minerals. The results support the picture of the dominance of Foy 2.1 and Foy 3.2 types of glass in central and eastern Balkans and on the Macedonian-Thracian coast during the sixth century AD. Our findings, together with the apparent absence of Levantine glass from this region reported until now, suggest that different trade routes were supplying these regions with Eastern Mediterranean raw glass from those supplying Adriatic Sea coasts