Претрага
1398 items
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An optimal sixteenth order family of methods for solving nonlinear equations and their basins of attraction
Dejan Ćebić, Nebojša Ralević, Marina Marčeta. "An optimal sixteenth order family of methods for solving nonlinear equations and their basins of attraction" in Mathematical Communications (2020)
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Mineralogical Discrimination between Authentic and Recent Imitations of Pottery Manufacture in Zlakusa, Serbia
... minerals. A total of three vessels were analysed, broken down by type of workmanship: coiling technique (traditional handmade clay pot made by coiling on a hand-turned wheel) marked -1-; wheel throwing (on a wheel with an electric drive) marked as -4- and by moulding (application of a mould) marked ...
... traditionally (wood-fired oven), stands out. A microscopic examination of the thin sections revealed a uniform mineral composition and porosity. For sample -5- a specific fluid-structure is consistent with the way it was introduced by the application of a mould. The measurements of moisture absorption ...
... territory of Serbia. What makes it a unique phenomenon, in technological terms, is the fact that with the discovery of new techniques and production processes, the old ways, already adopted and mastered continued to live and actively coexist until today. This also brings a rise in imitations of pottery ...Maja Milošević, Mihovil Logar, Biljana Đorđević. "Mineralogical Discrimination between Authentic and Recent Imitations of Pottery Manufacture in Zlakusa, Serbia" in Nordic Clay Meeting/3rd Symposium Clays & Ceramics 2021, The Latvian Clay Science Society (2021)
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Hydrogeochemistry of Uranium in the Groundwaters of Serbia
Marina Ćuk, Maja Todorović, Petar Papić, Jovan Kovačević, Zoran Nikić. "Hydrogeochemistry of Uranium in the Groundwaters of Serbia" in Uranium - Past and Future Challenges, Springer International Publishing Switzerland (2015). https://doi.org/10.1007/978-3-319-11059-2_89
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A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers
Effectiveness evaluation is one of the basic components of engineering asset management and maintenance engineering in general. Effectiveness is an overall concept representing a measurement of quality of service level for the analyzed engineering system. This concept contains a series of partial indicators relating to time in operation and time for maintenance activities, as well as functional properties of the system. This article describes the analysis and structuring of partial indicators, as well as the development of a model ...Miloš Tanasijević, Predrag Jovančić, Dejan Ivezić, Uglješa Bugarić, Radiša Đurić. "A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers" in International Journal of Industrial Engineering: Theory, Applications and Practice (2019)
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Interactions of Copper(II) Complexes of some Schiff base ligands with calf thymus DNA and bovine serum albumin
Joni prelaznih metala u kombinaciji sa različitim ligandima nude veliki broj mogućnosti za ispitivanje potencijalnih bioaktivnosti. Među jonima prelaznih metala, bakar je poznat kao endogeni metal za ljude, sa karakterističnim biološkim redoks aktivnostima i relativno jakim afinitetom za nukleobaze. Kompleksi bakra ispoljavaju svoju antitumornu aktivnost na nekoliko različitih načina, generišu veliku količinu ROS, što uzrokuje oksidativno oštećenje mitohondrija i biomakromolekula. Nađeno je da kompleksi bakra(II) imaju umeren do dobar afinitet vezivanja sa DNK, uglavnom putem interkalacije.Angelina Petrović, Aleksandar Mijatović, Rada Baošić, Jovana Bogojeski. "Interactions of Copper(II) Complexes of some Schiff base ligands with calf thymus DNA and bovine serum albumin" in 6. Konferencija mladih hemičara Srbije, Srpsko hemijsko društvo (2018)
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Spatial assessment of the areas sensitive to degradation in the rural area of the municipality Čukarica
Nature and Landscape Conservation, Soil Science, Agronomy and Crop Science, Water Science and TechnologyNatalija Momirović, Ratko Kadović, Veljko Perović, Miloš Marjanović, Aleksandar Baumgertel. "Spatial assessment of the areas sensitive to degradation in the rural area of the municipality Čukarica" in International Soil and Water Conservation Research, Elsevier BV (2019). https://doi.org/10.1016/j.iswcr.2018.12.004
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Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)
Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary ChangeLjiljana Vasić, Saša Milanović, Anita Puskás-Preszner, Laszlo Palcsu. "Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)" in Environmental Earth Sciences, Springer Science and Business Media LLC (2020). https://doi.org/10.1007/s12665-020-08910-x
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A contribution to the understanding of the discharge dynamics and water balance of the karst spring Gornji Dušnik (Suva Planina)
A sufficiently long time-series of daily discharges is needed to assess the discharge dynamics and calculate the water balance equation parameters of a spring (river source). The paper assumes that a catchment is gauged if a time-series of observations of at least 30 years is available, which is a rare case in Serbia. One-year monitoring is often set up to verify the reserves of a water source or spring intended for capture. Monitoring ceases after the final report is ...Aleksandar Tanasković, Vesna Ristić Vakanjac, Dušan Polomčić, Jelena Ratković. "A contribution to the understanding of the discharge dynamics and water balance of the karst spring Gornji Dušnik (Suva Planina)" in National Conference with International Participation “GEOSCIENCES 2023”, Review of the Bulgarian Geological Society, Sofia : Bulgarian Geological Society (2023)
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Tehnologija izrade i opremanje magacina eksploziva za potrebe ležišta bakra
Aleksandar Milojević (2024)Nakon radova otvaranja i početka eksploatacije, rudno telo bakra velikih rezervi zahteva i veliku količinu eksploziva da bi se ostvario zacrtan kapacitet. Samim tim, neophodno je izraditi funkcionalan magacin eksploziva koji će biti pristupačan svim horizontima i koji će moći da ispuni celokupni kapacitet svih horizonata. Obzirom da će se u magacinu skladištiti eksploziv, on mora ispunjavati specijalne uslove kako bi skladištenje bilo bezbedno. Neophodno je isprojektovati magacin tako da ispuni sve zahteve po pitanju količine i načina skladištenja eksploziva, ...... 3 5| bp -| M.| O x . O . B | 9 r l a | — - - A es o|oo 5 = _ | G [=\} + —=|aq rN q .E .5 - I elsij|a 55 e | o | o | } = a j a | — bb E – ~ [= < s . | ~ j G s s = o | a | a q E e | e] W l » o r u 8 g M ...
... Me N s a >cg Š 5I BE EJMG S šB Sl|S|šmsm| 9 < o i » 7ij:: B= = , , . | .S.S 8 o - Ws!ı PlBB B E g g ı a|BS|E BI B o | e . -= ” o o o = o | |l i o od O Š [-3 [-3 _ |O5 s | | < e [-v [=v (] [-u 271 271 O |MS=S| N [-u |} N NETE ~ - ~ <= | —=| —= —~ a ~ ~< Sb b = = = = S B|E|a ŠB 0 a Š e a 5 ~| ...
... plan magacina eksploziva 2 se može videti na slici 4.2. 17 195> J 5 d IJA i 89601 f 48368 35 75 0 DOO/2, BO a a= š iiis k*_,l.·.j |j. „.1@.!„. __12000 a a a O OOO O EO N Rigp OE Slika 4.2. Situacioni plan magacina eksploziva 2 4.3. Dimenzionisanje prostorija Dimenzije i oblici ...Aleksandar Milojević. Tehnologija izrade i opremanje magacina eksploziva za potrebe ležišta bakra, 2024
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Површинско распадање керсантита из Тешића мајдана у корелацији са начином обраде на примеру малог степеништа (Београдска тврђава)
Невенка Новаковић (2024)Архитектуру Београда на прелазу 19. у 20. век обележила је употреба керсантита из каменолома Тешића мајдана. Kao камен високих декоративних својстава, керсантит је коришћен за јавне споменике, делове или потпуну изградњу објеката (Народна скупштина Србије, Мало степениште, Народни музеј и др.). Како очување споменика културе изискује познавање својстава уграђеног камена, истраживања су обухватила детаљно проучавање петролошких, хемијских и физичких карактеристика керсантита из Тешића мајданa и узорака камена из споменика Мало степениште (студија случаја). Након детаљног мапирања стања керсантита, лабораторијских ...керсантит, Мало степениште, споменик културе, архитектонски камен, физичко-хемијско распадање, мапирање, форме распадања, површинска обрадаНевенка Новаковић. Површинско распадање керсантита из Тешића мајдана у корелацији са начином обраде на примеру малог степеништа (Београдска тврђава), Београд : [Н. Новаковић], 2024
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Sepiolite – a by-product of exploitation as a potential raw material in Serbian industry
This paper gives a brief overview of the sepiolite deposits, the basic properties, and the possibilities of using this mineral. Particular attention is paid to sepiolites from domestic production, especially the use of sepiolites suitable for the development of small businesses and technologies, with a focus on environmental protection. Aim of this paper is to point out importance of this mineral and to draw attention to the use of domestic raw materials. With appropriate mechanical and chemical pretreatments, sepiolite is ...Radmila Gaćina, Katarina Urošević, Jelena Zakonović. "Sepiolite – a by-product of exploitation as a potential raw material in Serbian industry" in Underground mining engineering , Belgrade : University of Belgrade - Faculty of Mining and Geology (2019). https://doi.org/10.5937/podrad1935081G
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Heavy metals in lignite and soil of Kostolac-Kovin coal basin, eastern Serbia - comparative analysis with selected cities in Serbia, region, Europe and world
Bogoljub Vučković, Bojan Dimitrijević (2023)The Kostolac-Kovin coal basin with an area of 320 km2, with 5 separate layers of coal and with a total of about 5.7 Bt of geological resources and reserves represents an exceptional potential for coal production in Serbia. The coal resources listed in this way are not fully exploitable, but they represent potential for consideration. In this paper, we deal with the geochemical characteristics of coal seams and perform a comparative analysis of coal affectation on the environment. With ...... burning the same samples. A total of 155 samples were taken from coal and 45 from 179 ash. A total of 22 chemical elements were analyzed. Here is an overview of three. It can be concluded that there is a certain lateral zonation of the distribution of Zn, Cu and Pb (ppm) in such a way that in the area ...
... Europe and World are mainly a consequence of the geological composition and geochemical background of that region, as well as anthropogenic/industrial influence. REFERENCES: 1. Aguilera A., Bautista F., Gutierez-Ruiz M., Ceniceros-Gomcz A., Cejudo R., Goguitchvill A., 2021 – Heavy metal pollution ...
... secams was registered, which continuously extend under the Danubce (Fig. 3 a, b, c). In the part of the unique deposit, on OP Drmno and OP Cirikovac, there is also a 5" coal layer (Fig. 3d) which is of small thickness, is at a great depth and is not balanced. These 4 coal layers (I, la, II and III): ...Bogoljub Vučković, Bojan Dimitrijević. "Heavy metals in lignite and soil of Kostolac-Kovin coal basin, eastern Serbia - comparative analysis with selected cities in Serbia, region, Europe and world" in 9th International Conference Mining and Environmental Protection, 24–27. May 2023, Sokobanja, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet (2023)
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Legal framework for recultivation of degraded areas caused by mining exploitation
Radmila Gaćina (2023)Prilikom površinske i podzemne eksploatacije uglja eksploatacioni sistemi oštećuju veće ili manje površine zemljišta. Iskustva pokazuju da su oštećenja zemljišta znatno veća kod površinske eksploatacije, gde je prostora degradiran ne samo u konturi rudnika i okoline, već se promene takođe dešavaju u prirodnom okruženju. U članku su predstavljeni rezultati studije zakonskih okvira rekultivacije u nekim zemljama sveta i u Srbiji. Praktično iskustvo rekultivacije pokazalo je da iskorišćenje i devastacija tokom rudarske aktivnosti predstavljaju opasnost ne samo za pogođena ...... by a specific activity. The term devastated area is also usually used, which denotes a lifeless area after use, without a fertile soil layer suitable for future cultivation. Damaged land is brought to a new purpose through technical and biological reclamation, where land reclamation is a set of ...
... at all, 2023). Land recultivation seeks to make the land more productive and create a far better situation for environment after coal mining. Moreover, a good recultivation policy is a great way to introduce a restorative approach to the environment plus the sustainable management of reclaimed ...
... regulation 1 INTRODUCTION Recultivation can produce more value for the environment and create a better situation for post-mining land. Recultivation obligation policy is a great way to introduce a restorative approach to the environment, but main problem is the inconsistency of the mining companies ...Radmila Gaćina. "Legal framework for recultivation of degraded areas caused by mining exploitation" in Underground mining engineering, Belgrade : University of Belgrade - Faculty of Mining and Geology (2023). https://doi.org/10.5937/podrad2342027G
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Human factor risk management procedures applied in the case of open pit mine
Snežana Kirin, Aleksandar Sedmak, Wei Li, Miodrag Brzaković, Igor Miljanović, Ana Petrović, Simon Sedmak (2021)Risk management aims to provide a controlled work environment to ensure the safe operation of the high-risk systems. It is a dynamic process which work in a continual state of change. The issue of human factor risk and rules and regulations in open pit mine is a main focus of this paper in order to develop predictive models of behavior of workers in relation to compliance with the procedures and rules. Presented survey was conducted in open pit coal ...Snežana Kirin, Aleksandar Sedmak, Wei Li, Miodrag Brzaković, Igor Miljanović, Ana Petrović, Simon Sedmak. "Human factor risk management procedures applied in the case of open pit mine" in Engineering Failure Analysis (2021). https://doi.org/https://doi.org/10.1016/j.engfailanal.2021.105456
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Development of Open Educational Resources (OER) for Natural Language Processing
In this paper we present the development of an online course at the edX BAEKTEL platform named “Lexical Recognition in the Natural Language Processing (NLP)”. It is based on the course of the same name for PhD studies at the University of Belgrade, Faculty of Philology. There are not many courses in Computational Linguistics (CL) on OER platforms, and there is none in Serbian either for CL or NLP. We have developed this course in order to improve this ...... 11. Organization of graphs in cascades enables complex text transformation. Each graph in a cascade is a transducer that transforms a text. A graph that follows works on this transformed input. A full Named Entity Recognition System for Serbian is presented as an illustration. Didactic ...
... expression input. Picture 2 represents a simple example of question where the answer requires a click on the part of a picture. After submission, the student is able to see the explanation. Image 2: Question - image mapped input Specific formats It was a big challenge to embed different formats ...
... target group, we provided a description of the course, a list of required programs that will be used and the literature related to the topics included in the course. Whenever possible, hyperlinks to the materials are provided. If the material does not exist in e-format, a link to the list of libraries ...Cvetana Krstev, Biljana Lazić, Ranka Stanković, Giovanni Schiuma, Miladin Kotorčević. "Development of Open Educational Resources (OER) for Natural Language Processing" in The Sixth International Conference on e-Learning (eLearning-2015), September 2015, Belgrade, Serbia, Belgrade : Belgrade Metropolitan Univesity (2015)
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New data on the age of an Upper Cretaceous clastic-carbonate succession in Brežđe (Western Serbia)
Nevenka Đerić, Nataša Gerzina (2014)... in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs New data on the age ofan Upper [a(f:\č;{a{el_}:yx:bi{ew{ec|geloln}:(-}{M{aa{=}-{{0}}| in Brežđe (Western Serbia) ~ Nevenka Đerić and Nataša Gerzina y of Mining and Geology, Univ y e ...
... studied in a carbonate-clastic section from the Cretaceous sedi- mentary cover that unconformably overlies Triassic sediments of the Jadar Block. According to the identified radi- olarian associations, the studied limestone is of Santonian age. Considering the fact that these sediments belong to a broadly ...
... Turonian sediments, but are together marked as a single unit of Turonian-Senonian age. During the last few years, however, radiolarian investigations have becn focused on the Struganik locality in the vicinity of Brežđe village. These investigations enabled a more detailed biostratigraphic assignment ...Nevenka Đerić, Nataša Gerzina. "New data on the age of an Upper Cretaceous clastic-carbonate succession in Brežđe (Western Serbia)" in Geologia Croatica (2014)
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The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia
For the purpose of the facilities construction within the transfer station „Prelici“ in Cacak, specific geotechnical investigations were carried out based on which the technological project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the ...... treatment is being improved, a certain number of workers of lower social status are employed and a positive economic effect is achieved. From a citizen's perspective, the introduction of a quality organization into the waste management system, with the exception of a stimulating effect (feeling ...
... investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the production of a new technological project. For these reasons, the importance of geotechnical investigations ...
... terrain often exceed the costs of establishing a recycling yard, i.e. transfer station, • increasing investment and exploitation costs for equipment and labor. 3. PRESENTATION OF TRANSFER STATION „PRELICI“ WITH SELECTION AND RECYCLING CENTER As a part of the transfer station “Prelici”, the following ...Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić. "The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia" in 17th International waste management and landfill symposium, Proceedings SARDINIA 2019, CISA Publisher (2019)
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Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector
To strengthen the security of supply of the Serbian gas sector, it is necessary to analyze the impact of planned strategic measures. The analysis involves the identification of the most influential threats to the security of natural gas supply and prioritization of the strategic measures for overcoming the consequences of threats. The proposed methodology is based on Fuzzy Analytic Hierarchy Process. The obtained weights for the identified threats and strategic measures are formed according to experts' judgments. The results ...Sigurnost snabdevanja, Donošenje odluka, Snabdevanje prirodnim gasom, Fazi AHP, Energetski indikatoriBoban Pavlović, Dejan Ivezić, Marija Živković. "Prioritization of strategic measures for strengthening the security of supply of the Serbian natural gas sector" in Energy Policy, Elsevier BV (2020). https://doi.org/10.1016/j.enpol.2020.111936
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Hydrothermal Synthesized and Alkaline Activated Carbons Prepared from Glucose and Fructose—Detailed Characterization and Testing in Heavy Metals and Methylene Blue Removal
Sanja Krstić, Milan Kragović, Maja Pagnacco, Vladimir Dodevski, Branka Kaluđerović, Miloš Momčilović, Ivica Ristović, Marija Stojmenović (2018)glukoza, fruktoza, аktivni ugalj, hidrotermalni tretman, aktivacija hidroksida, teški metali, metilen plavo... with Cu Kα 1,2 radiation source (a generator voltage of 40.0 kV and a generator current of 40.0 mA). All samples were recorded in the range of 10–90◦ 2θ, with a scanning step of 0.02◦ and at a scan rate of 2◦/min. Raman spectra of activated carbons were collected on a DXR Raman microscope (Thermo Scientific ...
... Olympus optical microscope and a CCD detector, with a diode pumped solid state high-brightness laser (532 nm) and a 10× objective. The powdered sample was placed on X–Y motorized sample stage. The analysis of the scattered light was carried out by the spectrograph with a grating 900 lines/mm. The laser ...
... is particularly significant in inorganic or organic pollutants removal, due to a large number of unique characteristics, such as a highly developed porous structure, large surface area, variability in surface chemistry, and a high level of surface activity [33–35]. The major drawback of the conventional ...Sanja Krstić, Milan Kragović, Maja Pagnacco, Vladimir Dodevski, Branka Kaluđerović, Miloš Momčilović, Ivica Ristović, Marija Stojmenović . "Hydrothermal Synthesized and Alkaline Activated Carbons Prepared from Glucose and Fructose—Detailed Characterization and Testing in Heavy Metals and Methylene Blue Removal" in Minerals, MDPI (2018)
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Hydrographic and hydrological characterization of the Vodenička and Rosomačka rivers
Vesna Ristić Vakanjac, Marina Čokorilo Ilić, Dušan Polomčić, Dragoljub Bajić, Jelena Ratković (2017)The Visočica River rises in Bulgaria, on the Berovo Mountain. Its course in Bulgaria is 16.7 km long. It enters Serbia near the village of Donji Krivodol. Up to the village of Pakleštica, or the beginning of Lake Zavoj, its right-bank tributaries are the Krivodolštica, the Vodenička, the Rosomačka and the Dojkinačka. There are no left-bank tributaries. Among the tributaries, water levels and discharges are gauged only on the Dojkinačka River. The Vodenička had also been gauged but only ...... Воденичке... Пиротски зборник 42 (2017) 1-24 11 0 2 4 6 8 10 12 14 16 18 1 2 3 4 5 6 7 8 9 10 11 12 M e a n a n n u a l d is c h a rg e Q ( m 3 /s ) The Visocica at Izatovac The Visocica at V. Ržana The Visocica at Braćevci The Visocica at Pakleštica The ...
... 63 19 65 19 67 19 69 19 71 19 73 19 75 19 77 19 79 19 81 19 83 19 85 19 87 19 89 19 91 19 93 19 95 19 97 19 99 M e a n a n n u a l d is c h a rg e Q ( m 3 /s ) Vodenicka River Rosomacka River Figure 7 Calculated mean annual discharges of the Vodenička and Rosomačka ...
... Срачунате средње годишње вредности протицаја Воденичке и Росомачке реке 0 0.5 1 1.5 2 2.5 1 2 3 4 5 6 7 8 9 10 11 12 M e a n a n n u a l d is c h a rg e s Q ( m 3 /s ) Vodenicka River Rosomacka River Figure 8 Monthly distributions of calculated discharges of the Rosomačka ...Vesna Ristić Vakanjac, Marina Čokorilo Ilić, Dušan Polomčić, Dragoljub Bajić, Jelena Ratković. "Hydrographic and hydrological characterization of the Vodenička and Rosomačka rivers" in Pirotski zbornik, Pirot : Narodna biblioteka Pirot (2017). https://doi.org/10.5937/pirotzbor1742001R