Претрага
497 items
-
Синтеза, структурне и магнетне особине Ca1-xGdxMnO3 нанопрахова
Milena Rosić (2014-12-05)У оквиру ове докторске тезе, испитиване су оптималне методе за добијањенанопраха – калцијум манганског оксида допираног јонима гадолинијума. Циљистраживања је испитивање одговарајућих прекурсора који су подесни да седобију чисти нано прахови манганита са перовскитском структуром, као имонофазни чврсти раствори са перовскитском структуром. Као подесан методкоришћена је модификована глицин нитратна метода, а од прекурсора нитрати иацетати одговарајућих метала. Модификација глицин нитратне методе се односина делимичну замену нитрата ацетатима, чиме је ублажена бурност реакције.Испитан је различити однос прекурсора, који дају наночестичне ...... powders of perovskite manganite structure, as well as single-phase solid solutions with a perovskite structure. As a suitable method used is a modified glycine nitrate method, a precursor nitrates and acetates of the respective metals. Modification of the procedure was performed by partial replacement ...
... Synthesis, structural and magnetic properties of Ca1-xGdxMnO3 nanopowders Abstract In this thesis, examined the optimal method for obtaining nano powders - calcium manganese oxide doped with gadolinium ions. The aim of the research is to examine the appropriate precursors ...
... W. (2003): Synthesis and characterization of IT-electrolyte with perovskite structure La0.8Sr0.2Ga0.85Mg0.15O3-δ by glycine–nitrate combustion method, Journal Of Alloys And Compounds, 348 [1-2], 325- 331. Cullity, B.D., Stock, S.R. (2001): Elements of X-ray Diffraction, 3rd ed., Prentice-Hall ...Milena Rosić. "Синтеза, структурне и магнетне особине Ca1-xGdxMnO3 нанопрахова" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2014-12-05)
-
INVENTS: A Hybrid Mine Ventilation Planning and Design System
Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper we ...... and design. Ventilation design is just one element or phase of the novel design approach. The component diagram on Fig.1 illustrates the proposed method that can be divided into six separate components. The first phase of the outlined methodology is data acquisition. In contemporary mining practice ...Lilić Nikola, Stanković Ranka, Obradović Ivan. "INVENTS: A Hybrid Mine Ventilation Planning and Design System" in Proceedings of International Scientific Conference of FME Session 4: Automation Control and Applied Informatics , Hong Kong : iConcept Press (2013)
-
INVENTS: a hybrid system for subsurface ventilation analysis
Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper we ...... and design. Ventilation design is just one element or phase of the novel design approach. The component diagram on Fig.1 illustrates the proposed method that can be divided into six separate components. The first phase of the outlined methodology is data acquisition. In contemporary mining practice ...Nikola Lilić, Ranka Stanković, Ivan Obradović. "INVENTS: a hybrid system for subsurface ventilation analysis" in Proc. of International Scientific Conference of FME, September 2000, Ostrava, FME (2000)
-
Why classical sequence stratigraphy doesn't work in Pannonian basin?
Dejan Radivojević (2018)... MATERIAL AND METHODS The regional composite seismic transect (figure 1) with length of more than 260 km at which rift sequence stratigraphy method is demonstrated is made to determine the range of base level change, as well as tectonic and sedimentary relationships. The transect covers entire ...Dejan Radivojević. "Why classical sequence stratigraphy doesn't work in Pannonian basin?" in 17th Serbian Geological Congress, Vrnjačka Banja, 17-20 maj 2018, Srpsko geološko društvo (2018)
-
Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia
The results of material entrainment analysis in RAMMS debris flow software, as well as numerical models of final flow heights for two case studies from the Republic of Serbia are presented. Both of debris flow cases started with initial sliding of huge volume block, prolonging to behave as flowing process. Results of the analysis showed that entrainment material affects final results of transportation model, runout distance, deposition area and volume of debris flow. In both cases entrainment volume is very ...Jelka Krušić , Biljana Abolmasov, Miloš Marjanović. "Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia" in Understanding and Reducing Landslide Disaster Risk. WLF 2020. ICL Contribution to Landslide Disaster Risk Reduction, Springer, Cham (2021). https://doi.org/10.1007/978-3-030-60706-7_25
-
Multihazard Exposure Assessment on the Valjevo City Road Network
Miloš Marjanović, Biljana Abolmasov, Svetozar Milenković, Uroš Đurić, Jelka Krušić, Mileva Samardžić Petrović (2019)Miloš Marjanović, Biljana Abolmasov, Svetozar Milenković, Uroš Đurić, Jelka Krušić, Mileva Samardžić Petrović. "Multihazard Exposure Assessment on the Valjevo City Road Network" in Spatial Modeling in GIS and R for Earth and Environmental Sciences, Elsevier Inc (2019). https://doi.org/10.1016/B978-0-12-815226-3.00031-4.
-
Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils
Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov (2021)MICP process, kinetic study, calcite, vaterite, MALDI-TOF identification, Bacillus licheniformis, Sporosarcina pasteurii... the same sampling time using pH-meter HI99161 (Hanna Instruments, Woonsocket, RI, USA). The number of viable cells was determined by the streaking method into triplicate on TSA with Urea and incubated 24 h at 30 ◦C. The evaluation of the rate coefficient for ureolysis was performed by integrating the ...
... −kprecipitate · t ) (5) Rate constants for the evaluation of ureolysis and reduction in calcium ions were presented using a nonlinear regression method using the Solver function in Microsoft Excel 2019. Microorganisms 2021, 9, 1691 6 of 20 2.5.2. Determination of Calcium Concentration The sterile ...
... approach for assessing the quality of olive cake pellets. Fuel Process. Technol. 2013, 116, 250–256. [CrossRef] 20. Shukla, A.; Cameotra, S.S. A new method for the screening of ureolytic bacteria inducing calcium carbonate precipitation. J. Biotechnol. Biomater. 2016, 6, 248–251. [CrossRef] 21. Mitchell ...Olja Šovljanski, Lato Pezo, Jovana Stanojev, Branimir Bajac, Sabina Kovač, Elvira Tóth, Ivan Ristić, Ana Tomić, Aleksandra Ranitović, Dragoljub Cvetković, Siniša Markov. "Comprehensive Profiling of Microbiologically Induced CaCO3 Precipitation by Ureolytic Bacillus Isolates from Alkaline Soils" in Microorganisms, MDPI AG (2021). https://doi.org/10.3390/microorganisms9081691
-
Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia
Dušan Polomčić, Bojan Hajdin, Zoran Stevanović, Dragoljub Bajić, Katarina Hajdin. "Groundwater management by riverbank filtration and an infiltration channel, the case of Obrenovac, Serbia" in Hydrogeology Journal, Berlin, Heidelberg : Springer, International Association of Hydrogeologists (2013). https://doi.org/10.1007/s10040-013-1025-9
-
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
-
The influence of Al<sup>3+</sup>ion on porcine pepsin activity<i>in vitro</i>
The in vitro effect of Al3þ ions in the concentration range 1.7·1026M–8.7·1023M on pepsin activity at pH 2, via kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated the existence of an activation effect of Al3þ at pH 2 on pepsin molecule. Kinetic analysis with respect to concentrations of haemoglobin showed that Al3þ ions increase the maximal velocity (Vmax) and kcat values rather than apparent affinity for substrate (KS) implying the non-competitive nature of activation which indicated ...... (TCA) and potassium chloride (KBr) were obtained from MERCK, all of reagent grade werec prepared prior to use. Ensyme assay "The Worthington method based on enzyme-catalyzed measured rate of hydrolysis of denatured haemoglobin (Hb) substrate was used for evaluation of enzyme activity in the ...
... enzymcein reaction mixture () U anius, /mg — Estimation of hinetic barameters Kinetic analysis was carried out according to a slightly modified method of Anson [26], by following the initial velocity of the enzymatic reaction in the absence and presence of AU?(1.7-·10 "-8.7·:10 *~M) and increasing ...Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić. "The influence of Al3+ion on porcine pepsin activityin vitro" in Journal of Enzyme Inhibition and Medicinal Chemistry, Informa UK Limited (2008). https://doi.org/10.1080/14756360701841095
-
Centar za hidrogeologiju karsta - 15 godina nauke i struke
... Planning and the Water Directorate of Serbia (within the first groundwater vulnerability map of Serbia in scale 1:b00,000 was created, using the IZDAN method, whose authors are CKH members), and also projects Research, evaluation and importance of groundwater resources in the concept of sustainable d ...
... podzemnih voda u sklopu projekta Operativni monitoring podzemnih voda Srbije (desno) Final groundwater vulnerability map o Serbia according to the IZDAN method (left); Groundwater monitoring locations as part of the project ”Operational Groundwater Monitoring of in Serbia” (right) 13 15 CKH Međunarodnhi ...
... visited Serbia, that is, the karst terrains of eastern Serbia, with the aim of sampling karst waters for groundwater ageing by the 39Ar isotopic method. 15 CKH Članovi Instituta ATOMKI i CHK sa uređajem za ekstrakciju argona iz vode (jul, 2021) Members of the Institute ATOMKI and CKH with ...urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović. Centar za hidrogeologiju karsta - 15 godina nauke i struke, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet, Centar za hidrogeologiju karsta, 2023
-
Примена нумеричких метода у моделовању тецишта са освртом на различите реолошке услове
Јелка Крушић (2023)Тецишта су комплексне појаве нестабилности које захтјевају истраживања и испитивањакоја до сада нису рађена код нас у области геотехнике. По механизму, начину активирањаи понашању покренутог материјала се знатно разликују од клизишта. Циљ оведисертације је била примјена нумеричких модела пропагације тецишта на примјеру двијепојаве које су се десиле у Србији као посљедица дјеловања циклона Тамара. Детаљноистраживање тецишта подразумијева теренско картирање, теренска истраживања илабораторијска испитивања одабраних узорака са терена. Од теренских истраживања напримјеру тецишта Селанац урађена су геофизичка истраживања Електричнетомографије док ...тециште, нумерички модели пропагације, циклон Тамара, геофизичка истраживања, лабораторијска испитивања, Селанац, Лева река, RAMMS, SPH geoflow, реолошки моделЈелка Крушић. Примена нумеричких метода у моделовању тецишта са освртом на различите реолошке услове, Београд : Универзитет у Београду, Рударско - геолошки факултет, 2023
-
Испитивање магнетске сусцептибилности прашине антропогеног порекла
... - Geografski fakultet Univerziteta u Beogradu, 63, 1-30. [4] Petrovský E., Kapička A., et al. (2000). Low-field magnetic susceptibility: a proxy method of estimating increased pollution of different environmental systems. Environ. Geol., 39, 312-318. [5] Vallero D. A. (2008). Fundamentals of ...Дубравка Новичић, Весна Цветков, Весна Дамњановић. "Испитивање магнетске сусцептибилности прашине антропогеног порекла" in VII Меморијални научни скуп из заштите животне средине доцент др Милена Далмација Нови Сад, 01-02. април 2019, Природно-математички факултет, Департман за хемију, биохемију и заштиту животне средине (2019)
-
Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles
Aleksandar M. Mijatović, Ratomir M. Jelić, Jovana Bogojeski, Živadin D. Bugarčić, Biljana Petrović (2013)Kinetika i mehanizam reakcija supstitucije između [Ru(trpi)(bpi)Cl]+ sa nukleofilima gvanozin-5′-monofosfatom, L-histidinom, tioureom i dimetilsulfoksidom proučavani su spektrofotometrijski u 0,1 M NaClO4 na 310 K. Red reaktivnosti za odabrane ligande je: tiourea > gvanozin-5′-monofosfat > L-histidin > DMSO. Ovaj red je povezan sa elektronskim, strukturnim i hemijskim karakteristikama kompleksa i nukleofila. Reakcija supstitucije sa tioureom je proučavana na tri različite temperature (288, 298 i 310 K). Negativna entropija aktivacije DS = potvrđuje asocijativni način aktivacije. Formiranje kompleksa [Ru(trpi)(bpi)H2O]2+ sa ligandima ...... chemistry was characterized by fitting the potentiometric data to various acid-base models. The best model, selected according to the above-mentioned method of calculation, was consistent with the deprotonation of water molecules and formation of hydroxo and l-hydroxo complexes, as given in Eqs. (2–4) ...
... chemistry was characterized by fitting the potentiometric data to various acid-base models. The best model, selected according to the above-mentioned method of calculation, was consistent with the deprotonation of water molecules and formation of hydroxo and p-hydroxo complexes, as given in Eqs. (2-4). ...Aleksandar M. Mijatović, Ratomir M. Jelić, Jovana Bogojeski, Živadin D. Bugarčić, Biljana Petrović. "Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles" in Monatshefte für Chemie - Chemical Monthly, Springer Science and Business Media LLC (2013). https://doi.org/10.1007/s00706-013-1044-1
-
Opremanje bušotine X zavojnom pumpom
Milan Filipović (2024)Ovaj rad se bavi osnovnim pojmovima i karakteristikama zavojnih pumpi.Prikazan je sklop zavojnih pumpi i njena prateća oprema. Objašnjen je princip rada zavojnih pumpi kao i uloga svakog mašinskog elementa koji se nalazi u pumpi. Razmotrene su prednosti i nedostaci primene ovih primarnih mehaničkih metoda eksploatacije ugljovodonika. Dat je uvid u inovativna rešenja problematike primene zavojnih pumpi. Na konkretnom primeru bušotine X su prikazani problemi kao i rešenja primene ovih primarnih mehaničkih metoda u praksi. Napravljena je detaljna analiza ...... |kg/(m.s) Temperature (2nd): | 19.9 degC Viscosity (2nd): _ |0.2346629 kg/(m.s) [[] PiPESIM Save as template MIXTURE Emulsion viscosity method: Set to viscosity of the continuous ph... ~ Inversion watercut: % Specify _ C)Calculate 60 % i e | + close Slika 13 Viskoznost fluida & ...
... 30274 k)/(kg.K) + |0.0346 W/(m.K) Oil 1.88406 KJ/(kg.K) Y |0.1384 W/(m.K) + Water 4.1868 Kk)/(kg.K) Y |0.6055 W/(m.K) + Enthalpy calculation method: _ 1983 (e 2009 Specific latent heat of vaporization: 325.639 kJ/kg ” [[] PiPESIM m +/ Close Slika 14 Termalne osobine fluida Viskoznost i ...Milan Filipović . Opremanje bušotine X zavojnom pumpom, 2024
-
Избор одговарајуће механичке методе
Анастасија Мирјанић (2024)Експлоатација нафте и гаса кључна је за задовољење глобалних енергетских потреба. Различите методе се користе за ефикасно вађење тих природних ресурса из земљe. Механичке методе експлоатације, које укључују различите врсте пумпи и компресора, играју значајну улогу у овом процесу. У нафтној индустрији, ефикасно вађење нафте и гаса зависи од избора одговарајуће технологије пумпања. Две од најраспрострањенијих технологија су дубинске пумпе са клипним шипкама (енгл. Sucker rod pumps- SRP) и електричне потапајуће пумпе (енгл. Electrical submersible pump- ESP). Овај завршни рад ће ...Анастасија Мирјанић. Избор одговарајуће механичке методе, 2024
-
Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal
Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)... households (for cooking and heating), particularly in Serbia, India, and China [13,14]. Numerous studies were performed on lignite pyrolysis as a method for its improved utilization [15–17]. A recent strategy in bioplastics development concerns the extensive use of natural products. Polysaccharides ...
... indicated the possible positive aspects of its co-pyrolysis with HDPE [42]. Therefore, the paper investigates lignite/HDPE co-pyrolysis as a possible method for utilization of lignite of extremely low quality (ash content > 40%; organic carbon content <30%). The objective was to examine and confirm the ...
... the heating value of municipal solid waste. Fuel 2003, 82, 1119–1125. [CrossRef] 41. Han, J.; Yao, X.; Zhan, Y.; Oh, S.Y.; Kim, L.H.; Kim, H.J. A method for estimating higher heating value of biomass-plastic fuel. J. Energy Inst. 2017, 90, 331–335. [CrossRef] 42. Kojic, I.; Bechtel, A.; Kittinger, ...Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović. "Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal" in Polymers, MDPI AG (2021). https://doi.org/10.3390/polym13050759
-
Formative evaluation of e-learning projects with the logical framework approach
... model, referred to evaluation are often used in an alternative way, although there are some differences in meaning. Evaluation approach is the method, or the mental attitude, or the particular perspective by which the evaluation is gathered, while the model is the description of the structure ...Roberto Linzalone, Giovani Schiuma, Ivan Obradović, Ranka Stanković. "Formative evaluation of e-learning projects with the logical framework approach" in The Sixth International Conference on e-Learning (eLearning-2015), September 2015, Belgrade, Serbia, Belgrade Metropolitan Univesity (2015)
-
Prirodno prečišćavanje i stimulisana bioremedijacija podzemnih voda zagađenih naftnim ugljovodonicima
Nenad M. Marić (2016-09-26)Disertacija se konceptualno sastoji iz dva dela kojima je obuhvaćen pasivan (prirodnoprečišćavanje) i aktivan remedijacioni pristup (stimulisana bioremedijacija) kodpodzemnih voda zagađenih naftnim ugljovodonicima.U prvom delu disertacije prikazani su rezultati osmatranja procesa prirodnogprečišćavanja u podzemnim vodama na lokaciji istorijskog zagađenja kerozinom.Tragovi zagađenja naftnim ugljovodonicima pronađeni su 20 godina nakon prosipanjakerozina. Ovo je stvorilo osnovu za proučavanje efekata dugotrajne izloženostipodzemnih voda procesima biodegradacije u terenskim uslovima. Uočeno je da sesnižene koncentracije elektron akceptora (O2, NO3-, SO42-) i povišene koncentracijemetaboličkih produkata biodegradacije ...... hemical methods: Method 3810 A, Static Head Space; Method 8015 D nonhalogenated organic using GC/FID. EPA publication SW-846. 135. VDM 0133 - Test methods for evaluating solid waste, phisical/chemical methods: Method 3510, Separatory funnel liquid-liquid extraction; Method 8015 D nonhalogenated ...
... Elaborat o izvršenim geotehničkim radovima za potrebe remedijacije zemljišta na lokaciji Nitex/Benneton u Nišu. Geoinženjerning, Niš. 43. EPA Method 9071B (1998) n-Hexane extractable material (HEM) for sludge, sediment, and soil samples. Nenad M. Marić ...
... Determination of pH. ISO, Geneve. 65. ISO 11465 (1993) Soil Quality - Determination of dry matter and water content on a mass basis – Gravimetric method, Geneve. 66. ISO 16703 (2004) Soil Quality - Determination of Content of Hydrocarbon in the Range C10 to C40 by Gas Chromatography. ISO, Geneve ...Nenad M. Marić. "Prirodno prečišćavanje i stimulisana bioremedijacija podzemnih voda zagađenih naftnim ugljovodonicima" in Универзитет у Београду, Универзитет у Београду, Рударско-геолошки факултет (2016-09-26)
-
Softverski alati za korišćenje resursa za srpski jezik
Ivan Obradović, Ranka Stanković (2008)... alignment methods. The goal is to connect equivalent seg- ments in two or more parallel texts. The method usually used for alignment at the sentence level, which is the most common one, is the method developed by (Gale and Church, 1993). Figure 2 depicts an example of an aligned text represented ...Ivan Obradović, Ranka Stanković. "Softverski alati za korišćenje resursa za srpski jezik" in INFOteka: časopis za informatiku i bibliotekarstvo, Belgrade, Serbia : Zajednica biblioteka univerziteta u Srbiji (2008)