Velibor Andrić | The Vinca Institute of Nuclear Sciences (original) (raw)

Papers by Velibor Andrić

Coatings

Traditional Serbian religious art originated in Byzantine culture and conserved Byzantine element... more Traditional Serbian religious art originated in Byzantine culture and conserved Byzantine elements until modern times. However, since the end of the 17th century, many changes in traditional icon painting have been introduced. Previous studies focused on the changes in iconography and style, but very little attention was paid to the changes in painting materials and techniques. This research focuses on the blue pigments on icons from the first half of the 18th century. Eight icons with blue areas of a different hue were selected for the study. Due to its rarity in nature, price, and iconographical importance, the blue pigment was particularly praised by painters. Therefore, the choice of the blue pigment can be related to historical information to trace influences and the development of the painter’s practice. Imaging techniques, several portable, non-destructive analytical techniques, such as XRF and FTIR, followed by optical microscopy and SEM-EDX analysis of the samples were used...

Naziv tehničkog rešenja: Nova metoda za sintezu keramičkih materijala i nedestruktivnu karakteriz... more Naziv tehničkog rešenja: Nova metoda za sintezu keramičkih materijala i nedestruktivnu karakterizaciju površinskih oštećenja usled izlaganja kavitaciji Novo tehničko rešenje (metoda) primenjeno na nacionalnom nivou Ključne reči: Vatrostalni keramički materijali, Kavitacija, Analiza slike, Prepoznavanje oblika Za koga je rešenje rađeno: MALBEX WBI DOO, Beograd, Srbija Godina kada je rešenje kompletirano: 2019. Godina kada je rešenje počelo da se primenjuje i od koga:

In this paper, the data from the Serbian National Soil Radioactivity Monitoring network were used... more In this paper, the data from the Serbian National Soil Radioactivity Monitoring network were used to study the regional distribution of 8 radionuclides. Eight different sampling locations in four regions were chosen for the study. PCA was applied to training dataset in order to examine the influence of the radionuclides on regional characterization of the soil. Scattering matrices based dimension reduction technique was applied to the same dataset for soil sample classification according to radionuclide content, and also to monitor the significant patterns during the time . The obtained results show that the pattern recognition techniques applied are viable tools for such monitoring.

The radioactivity parameters in the food chain - legislation, control and critical points

IOP Conference Series: Earth and Environmental Science, 2021

Radioactivity, whether natural or artificial, today constitutes a significant segment in the proc... more Radioactivity, whether natural or artificial, today constitutes a significant segment in the process of protecting human and animal health. Natural radioactivity is an integral part of our ecological system, so it has long been present in the food we eat. However, intensive industrial processes in some areas have disturbed the natural ecological balance and thus introduced into the environment natural radionuclides in quantities that can affect the quality of human life and the state of the environment. On the other hand, artificial radionuclides reach the environment only in the case of accident situations in nuclear facilities. In the nuclear era so far, two accidents, Chernobyl in 1986 and Fukushima in 2011, affected the environment globally with the significant impact. Consequently, a system of monitoring radioactivity in the environment was introduced, which includes foodstuffs as well as animal feed. The paper describes the sources of radioactive contamination and the most cri...

Science of Sintering, 2015

The removal of Cs (I) ions from aqueous solution was studied using natural diatomite as adsorptio... more The removal of Cs (I) ions from aqueous solution was studied using natural diatomite as adsorption materials originated from Rudovci, Serbia. The microstructure of natural diatomite has been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) while the degree of Cs adsorption was evaluated by atomic emission spectroscopy. The cation exchange capacity (CEC) values for natural diatomite was 50 meq/100g. Depending on whether the Cs adsorption occurred in the acidic and alkaline media at a temperature of 298.15 K in acidic media ?G0 values was -12.674 kJ/mol, while in alkaline media ?G0 was - 13.142 kJ/mol and a change of ?S0 to 42.51 J/molK in acidic media and 44.08 J/molK in alkaline medium.

Experimental and Theoretical Investigations of Cured and Uncured Disiloxane Bisbenzocyclobutene Thin Films

Materials and Manufacturing Processes

The main challenge in the large-scale commercial applications of benzocyclobutene (BCB) dielectri... more The main challenge in the large-scale commercial applications of benzocyclobutene (BCB) dielectrics is to perform their curing rapidly and efficiently at low temperatures, and in the same time, to obtain large area, high quality, pinhole free dielectric thin films. For that purpose, we investigated numerous uncured and cured BCB films, approximately 2 µm thick, spin-coated on glass/ITO surface, using optical and AFM microscopy, infrared (IR) and Raman spectroscopy, and complete these results with appropriate Linear Combination of Atomic Orbitals (LCAO) calculations. That way we relate microscopic characteristics of the involved molecules, and macroscopic properties of the cured and uncured polymers, which is important for their practical applications.

Effect of ceria and zirconia nanoparticles on corrosion protection and viscoelastic behavior of hybrid coatings

Iranian Polymer Journal, 2014

Analysis of water, soil and fruit quality from Eco-Locations in serbia using nuclear and chemical methods

Recent Advances in Multidisciplinary Applied Physics, 2005

This paper presents results obtained by using analytical methods and instrumental techniques, suc... more This paper presents results obtained by using analytical methods and instrumental techniques, such as: energy-depressive x-ray fluorescence spectrometry (EDXRF), gamma spectrometry, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), flame atomic absorption spectrometry (F-AAS), graphite furnace atomic absorption spectrometry (GF-AAS) and hydride-generation/cold vapor atomic absorption spectrometry (HG/CV-AAS), based on standard procedures (AOAC, ISO, EPA etc). Physical/chemical and radiological investigations were performed on soil, water and fruit samples form an ecological micro locations Vlasina and Topola, Serbia. The purpose of those investigations was to determine possible presence of heavy metals and radionuclides, which could have negative influence on the quality of fruit and other food products from that location. Our research included various instrumental techniques in order to obtain more reliable results, and due to the fact that certain techniques can be used to measure only some of the parameters needed for the analysis. Some of those techniques are non-destructive (EDXRF and gamma spectrometry), and others are not. Results presented in this paper indicate very high quality of EMPOZ organic food produced in those ecological areas.

X-ray Fluorescence in Member States: Serbia. Recent Activities of the XRF Group formed in the Chemical Dynamics Laboratory of the VINCA Institute of Nuclear Sciences, Belgrade, Serbia

Radionuklidi u lancu ishrane na području opštine Grocka

Tehnika, 2015

U radu su prikazani rezultati DTA/TG analize polimetaličnog sulfidnog koncentrata bakra iz rudnog... more U radu su prikazani rezultati DTA/TG analize polimetaličnog sulfidnog koncentrata bakra iz rudnog ležišta "Veliki Krivelj" (Srbija) u temperaturnom intervalu 25-1000°C, na osnovu koje je predložen mehanizam oksidacije prisutnih sulfida u atmosferi vazduha na povišenim temperaturama. Kao potvrda predloženom mehanizmu, u radu su prezentovani rezultati EDXRF analize polaznog uzorka, XRD analize polaznog uzorka i produkata oksidacije na 550 i 950°C i rezultati SEM/EDS analize polaznog uzorka i produkata oksidacije na 675 °C. Upoređivanjem eksperimentalnih rezultata dobijenih XRD i DTA/TG analizom može se zaključiti da se proces oksidacije ispitivanog koncentrata može podeliti u dva stupnja: prvi stupanj čine reakcije oksidacije sulfida sa karakterističnim egzotermnim efektima ispod 650 °C, dok obrazovanje sulfata i oksisulfata i njihovo razlaganje do oksida bakra i železa čini drugi stupanj, praćen karakterističnim endotermnim efektima na višim temperaturama. Kinetička analiza procesa oksidacije ispitivanog koncentrata izvršena je po metodama Kissingera i Ozawe u neizotermskim uslovima. Rezultati kinetičkih ispitivanja i vrednosti energije aktivacije pokazali su da se proces oksidacije u celom ispitivanom temperaturnom intervalu nalazi u kinetičkoj oblasti.

Archaeometric Investigation of Medieval Pottery from Excavations at Novo Brdo, Serbia

Archaeometry, 2015

Medieval pottery from excavations at Novo Brdo, Serbia, an important mining and trading centre du... more Medieval pottery from excavations at Novo Brdo, Serbia, an important mining and trading centre during the 14th and 15th centuries, was investigated by a combination of optical microscopy, inductively coupled plasma – optical emission spectrometry, Fourier transform infrared, micro-Raman and energy-dispersive X-ray fluorescence spectroscopy and X-ray powder diffraction methods in order to determine its composition and firing temperature. The samples investigated were made of medium- to coarse-grained, non-calcareous clay, by a relatively well-controlled firing procedure in an oxidizing atmosphere. The firing temperature was estimated to be 850–950°C. The similarity between the chemical composition of the investigated pottery and the local raw clay, combined with the outward appearance and the archaeological findings, indicate domestic production. The pottery is covered with the transparent lead-rich glaze. Iron and copper were used as colourants.

Physico-chemical characterization of slag occurrences at Tilva Njagra locality, Bor region, Eastern Serbia

Journal of Mining and Metallurgy, Section B: Metallurgy, 2005

Physico-chemical characterization of slag occurrences at Tilva Njagra locality (Bor region, Easte... more Physico-chemical characterization of slag occurrences at Tilva Njagra locality (Bor region, Eastern Serbia) was done and the results of the research activities are presented in this paper. The samples were investigated using chemical analysis, XRD, DTA and EDXRF.

Thin Solid Films, 2014

Magnetic thin films of preferred thickness, patterns, and characteristics were produced using dig... more Magnetic thin films of preferred thickness, patterns, and characteristics were produced using digital printing at room temperature and under ambient conditions to realize magnetic cores for Radio Frequency Identification resonators. The magnetite nanoparticles (Fe 3 O 4) covered with oleic acid were synthesized for that purpose and inkjet printed from chlorobenzene solution on flexible polyimide (PI) substrate and on paper. The obtained nanoparticles have a homogenous morphology, approximately round shape and a size distribution of 7-10 nm. The crystallite size in the films remains the same as in the powder, although aggregation takes place to various extents in the films providing different magnetic properties in each of them. The inkjet printed magnetic cores were investigated in the frequency range from 10 kHz to 11 MHz. Only the magnetic cores printed on PI and annealed at 300 o C for 1h and 2h exhibit ferromagnetism (µ r > 1) at low frequencies, and at higher frequencies all films saturate to µ r < 1. For the 300 o C-2h annealed films the µ r saturation value is distinctly lower than for other films. µ r of the core realized on paper is lower than unity in the entire investigated range of frequencies and very uniform, especially at high frequencies. The presented results put forward the possibility of exploitation of the inkjet printed thin magnetic films in well-established manufacturing industries, such the watch making, banknote watermarking, and the smart tag production.

Journal of Thermal Analysis and Calorimetry, 2004

Results of physico-chemical investigations of slag occurrences from site Rgotski Kamen (Timok reg... more Results of physico-chemical investigations of slag occurrences from site Rgotski Kamen (Timok region, Serbia), obtained by using chemical analysis, XRD analysis, EDXRF spectroscopy, thermal analysis, mass spectrometry and optical microscopy, are presented in this paper.

Kinetic investigations of two processes for zinc recovery from zinc plant residue

Canadian Metallurgical Quarterly, 2011

ABSTRACT

Verification of the sampling procedure for radioactivity analysis of waste and industrial material

Radiation Protection Dosimetry

In accordance with ISO/IEC 17025:2017, the testing laboratory needs to verify its ability to prop... more In accordance with ISO/IEC 17025:2017, the testing laboratory needs to verify its ability to properly perform methods. For radiological testing, the sampling does not affect the results directly, but it has to ensure that sample adequately represents the tested material. To verify the procedure, a sampling of red mud and bauxite ore was conducted. All samples were measured in identical geometry by HPGe spectrometer. The counting rates per unit mass in the recorded spectra were compared. For each measurement series, the mean and standard deviations of respected peaks were calculated, as well as average and standard deviation of all series. The obtained results of each individual series were considered satisfactory, i.e. sampling procedure ensures the representativeness of the bulk material, if it is within ± two standard deviations of the average of the mean values.

Natural Radionuclides in Bottled Mineral Water at the Serbian Market

ACTIVITY CONCENTRATION OF 40 K AND 137 Cs IN MUSCLE TISSUE AND LIVER OF THE GOLDEN JACKAL (Canis aureus)

Radiocezijum u životnoj sredini planinskih regiona na teritoriji Republike Srbije