Претрага
1575 items
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Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases
Ispitivani su uticaji primene mono- i dvokomponentnih organskih modifikatora na određivanje lipofilnosti 12 tetradentatnih Šifovih baza metodom reverzno-fazne tankoslojne hromatografije. Osnovni cilj je da se proceni tip interakcije između posmatranih jedinjenja i komponenti primenjenih hromatografskih sistema i uspostavi neki obrazac ponašanja kako bi se lakše izabrala kombinacija organskih modifikatora koji će simulirati interakciju u biološkim sistemima na osnovu činjenica da iste osnovne intermolekularne interakcije su odgovorne za ponašanje supstanci i u biološkom i u hromatografskom sistemu. Primenjeni organski modifikator ...Nikola Stevanović, Aleksandar Mijatović, Aleksandar Lolić, Mario Zlatović, Rada Baošić. "Influence of mono- and two-component organic modifiers on determination of lipophilicity of tetradentate Schiff bases" in Chemical Papers, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s11696-021-01884-5
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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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Contribution to the geotechnical classification of municipal waste landfills in Serbia
Management, Monitoring, Policy and Law, Nature and Landscape Conservation, Geochemistry and Petrology, Waste Management and Disposal,Geotechnical Engineering and Engineering Geology,Water Science and Technology,Environmental Chemistry,Environmental EngineeringDragoslav Rakić, Irena Basarić, Laslo Čaki, Slobodan Ćorić. "Contribution to the geotechnical classification of municipal waste landfills in Serbia" in Environmental Geotechnics, Thomas Telford Ltd. (2018). https://doi.org/10.1680/jenge.18.00028
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Uniaxial compressive strength test before and after standard fire test on rock mass
Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović (2022)... cemnet with a clayey component, and fine-grained quartz which can be seen in some parts. The rock color (black) is most likely a consequence of the presence of divalent (ferro) iron. In Figure 1 is shown a microscopic image of rock sample. Figure 1. Microscopic image of a rock sample; ...
... is performed on a hydraulic press. A total of 6 samples (1-6) are tested and uniaxial compressive strength is determined. The same 6 samples (7-12) are placed in a furnace that simulates effect of fire. After that, the compressive strength of 6 samples (7-12) from furnace on a hydraulic press ...
... RESEARCH 2.1. Material characterization, microscopic description Rock has a clastic, psammitic texture. It is made of quartz clast, fragments of rock minerals and mica (muscovite and chlorite) which are bound with a limonite clay cement. Quartz clusters dominate, building about 60% of the rock ...Stefan Mitrović, Goran Todorović, Bojan Kostić, Milica Mirković-Marjanović, Nikola Božović, Marija Krstić, Aleksandar Erić, Radovan Gospavić, Snežana Ilić, Aleksandar Kijanović. "Uniaxial compressive strength test before and after standard fire test on rock mass" in Fifth symposium of the Macedonian Association for Geotechnics, Ohrid, North Macedonia, 23-25. 06. 2022, Macedonian Association for Geotechnics (2022)
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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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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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Strain partitioning along a curved strike-slip fault system during indentation: inferences from analogue modelling
Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović (2021)Nemanja Krstekanić, Ernst Willingshofer, Taco Broerse, Liviu Matenco, Marinko Toljić, Uroš Stojadinović. "Strain partitioning along a curved strike-slip fault system during indentation: inferences from analogue modelling" in GeoMod 2021, Doorn, the Netherlands, 19.-23.9.2021., Utrecht University (2021)
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Numerical modelling of a single intra-oceanic subduction for the origin of the Balkan ophiolites
Nikola Stanković, Vesna Cvetkov, Vladica Cvetković. "Numerical modelling of a single intra-oceanic subduction for the origin of the Balkan ophiolites" in 5th Congress Geologists of the Republic of North Macedonia, Ohrid, 28-29. 10. 2024, Македонско геолошко друштво (2024)
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Environmental Energy Security Indicators as Tools for Environmental Protection
Еколошка прихватљивост је постала незаменљив синтезни показатељ сваке валидне енергетске анализе у последње две-три деценије. Енергетска безбедност је у директној хармонији с еколошком прихватљивошћу кроз многе прописане политичке циљеве, економске користи, правне тековине итд. Индикатори еколошке сигурности представљају један од основних елемената за одређивање енергетске безбедности и снажне алате за усмеравање енергетског сектора ка одрживом развоју. У овом раду, анализа је била концентрисана на показатеље енергетске безбедности у области животне средине који се односе на сектор природног гаса у ...енергетска безбедност, еколошки енергетски индикатори, заштита животне средине, еколошка прихватљивост... Energy security is a parameter whose specificity lies in the influence of many factors, so it is not possible to define a unique methodology for determining it [1]. Namely, each country brings into consideration some specificity and its own approach to energy development. Defining a methodological ...
... actively promoted, is energy security. Energy security is a synthesis of the geopolitical and energy aspects of energy availability in various forms in satisfactory quantities and at affordable prices. Energy security as indicator is described with a group of synthesis indicators. It is necessary to c ...
... essential indicator. Energy security is a top priority issue for rapidly developing countries and, in energy terms, the demand for available energy is growing intensively [7]. In general, energy security is inextricably linked to the national security of a country and as such, can be considered ...Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević. "Environmental Energy Security Indicators as Tools for Environmental Protection" in Mining and Environmental Protection-MEP 2019, University of Belgrade, Faculty of Mining and Geology (2019)
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Geotehnički efekti razaranja komunalnog otpada različitim postupcima zbijanja
Jovana M. Janković Pantić (2022)Odlaganje otpada na komunalne deponije predstavlja osnovni način zbrinjavanja otpada u Srbiji. Kako bi se prostor za deponovanje materijala racionalno koristio potrebno ga je svakodnevno zbijati sa unapred definisanom količinom vode koja se dodaje. Dobro zbijeni komunalni otpad zauzima manju zapreminu i omogućuje sigurnije skladištenje, pa je korisno prethodno laboratorijski odrediti parametre zbijanja: maksimalnu suvu zapreminsku težinu (dmax) i optimalnu vlažnost (wopt). U Srbiji do sada nisu određivani parametri zbijanja, dok je u svetu primenjivana standardna metoda (Proktorov opit) ...Jovana M. Janković Pantić. Geotehnički efekti razaranja komunalnog otpada različitim postupcima zbijanja, Beograd : [J. Janković Pantić], 2022
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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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Хидрогеолошке карактеристике изворишта подземних вода “Зеленица” и “Горње поље” за водоснабдевање Лознице
Матија Стојановић (2024)Циљ овог истраживања је потреба за дефинисањем режима и категоризације резерви подземних вода где су изведени радови у раздобљу од јуна 2013. до јуна 2014. на истражно-експлоатационим бунарима изворишта "Зеленица" и "Горње поље" у Лозници. Истражно-експлоатациони бунари на наведеним извориштима каптирају збијени тип издани са слободним нивоом у оквиру квартарних шљункова и пескова, што указује на стабилност и поузданост извора. Према режимским осматрањима, утврђено је да се подземне воде могу неометано експлоатисати из бунара изворишта "Зеленица" у количини од ...извориште, збијени тип издани, истражно- експлоатисани бунари, квартарни седименти, резерве подземних вода... aaaaaaaaake 25 3.1 Tiperzejn nocajnanıtHx TCOJIOIHKHX HCTpajKHBalba a aananaaaaaaatiti 25 3.2 Teonmomnrka rpalja HcTpa)KHOr TEpeHa..aaaaaaaaaaaaaa a aaaaaaaaaaae a aaaaaaaaNat tt 26 3.3 TIpaka3 KaprMpaHMx JeMHMIMaaaaa a aaaaaaeaaaaaaaaae a aaaaaaaaN dttt 27 3.3.1 Tpujac (1) 3.3.2 . Muouen (M>) 3 ...
... “Oc3BOJIHH” JICJIOBH TOpeHa..aaaaaaaaaaaaa a aaaaaaa a aaaaaaataaatatet IIOCTOJERBE CTAĐE HA H3BOPHII(THMA “3EJIEHMILA” H “TOPME TIOJbE?”......... KBAHTMTATMBHE KAPAKTEPHCTHKE IIOJ13EMHMHX BOJIA ın 6.1 TIpaka3 TecToBa HpnceBa.aaaaa a aeanaaaaaaaaaaaaeaaaa a aaaaaeaaeaaeeı 6.2 OcwMarTpatba cJIeMeHaTa ...
... TepcHa -% d | : 5 3 ·V 2 3 :Š a HIyHH OcTOHCKH IIJbyHaK -. HpcTcHOBH L KPpyIIHO5pH a Q 1700/1500 mm 3 Py P BN I= 500 mm Jno0po . 3a00JbeH - -J 4 402 — x _ ZSz—— —— nep(popnpaHn . OcTOHCKH Pžs IIpcTeHOBH a 1700/1500 mm 5 ; 5.20. — a W |-500mm . LJ : · q LI | 6 — T. hJ ...Матија Стојановић. Хидрогеолошке карактеристике изворишта подземних вода “Зеленица” и “Горње поље” за водоснабдевање Лознице, 2024
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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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Проспекција и истраживање минерализације злата на подручју Чока Ракита (Црни Врх)
Ивана Сузић (2024)Рад се бави истраживањем лежишта злата и бакра на локацији Чока Ракита, која се налази у источном делу Србије, око 15 km од Жагубице. Прва истраживања на овом подручју компанија DPM (Dundee Precious Metals), у чијем је власништву ћерка компанија ДПМ Авала ДОО, је започела 2007. године, када су идентификоване аномалије злата у узорцима тла. Резултати почетних истражних бушења указали су на присуство комплексне минерализације у епикластичним стенама, али због неповољних металуршких карактеристика, ова минерализација није сматрана економски исплативом.Ипак, ...Чока Ракита, минерализација злата, скарновски тип лежишта, геолошка истраживања, истражно бушење, проспекција... M{/(ć-SS: : A \ae /@*\\ '· ~ RN NJE IN SS522 AR |O a ŠKO - Š OJ E= \5 + |NN , r 1500 3J 33 ~j -{ N - < 77 77 || i 48 96 00 0 23 ,- - el a ONO NCI R -ZI a _ & e eR || MOMOA _ \KQ27 s (Bayhacı 500 M VAaŽb y. Z A BI.A 48 95 00 0 W - - | a Ć= \ ...
... OyHIeBe al a aaaaaaaaaaaaaaaaaaaveek 49 8.1.1 Merajrypnrke OyHIOTHHE a aaaaaaaaaatakatı 50 8.1.2 CreneH ouyBaHOcTH Je3rpa al aananaaaaaaoatakaei 50 8.2 Byntepe MeTOJIOM peBep3He nupkynarmaje (RC) a 51 8.3. JinjaManrcko OyntePe 3a norpe0e HacraBka RC OymoruaHa, "Diamond tail" a ananaaaaaae ...
... .. ) A Lipmex: TipernenHa Tonorpadpcka KapTa ca yupTaHOM rpaHMLOM M 48 93 00 0 R N — — = — . O R a= e O O I .' - = N N > — | 'z ·„ _“ „ 7 7 — — „5 L / _\;.'„· '* ) —— mišwl„·_ A 0 W . N O J J N |_ \ t.N K (PR|GC2> / | — || O ~ MJN .•\•-': a _„"· W ...Ивана Сузић. Проспекција и истраживање минерализације злата на подручју Чока Ракита (Црни Врх), 2024
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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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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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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)