Претрага

Упит dcterms_subject_txt:Renewable Energy

383 items

  • Efficiency and lifetime of medium voltage transformers

    Snežana Aleksandrović, Vesna Damnjanović (2017)

  • Mikroelementi u uljnim šejlovima Aleksinca i njihov uticaj na životnu sredinu

    Nikoleta Aleksić (2021)
    ... for biodiesel production. Renewable and Sustainable Energy Reviews, 25, 742-748. [3] Veljković, V.B., Banković-Ilić, I.B., Stamenković, O.S. (2015). Purification of crude biodiesel obtained by heterogeneously-catalyzed transesterification. Renewable and Sustainable Energy Reviews, 49, 500-516. ...
    ... and physicochemical properties. Renewable and Sustainable Energy Reviews 90, 223-247. [7] Kambo, H.S., Dutta, A. (2015): A comparative review of biochar and hydrochar in terms of production, physico-chemical propreties and applications. Renewable and Sustainable Energy Reviews 45, 359-378. [8] Suo ...
    ... review on the current scenario and significance of crude glycerol resulting from biodiesel industry towards more sustainable renewable energy industry. Renewable and Sustainable Energy Reviews, 16, 2671–2686. [8] OECD/FAO (2017). OECD-FAO Agricultural Outlook 2017-2026. Paris, France: OECD Publishing. ...

  • Influence of Initial Treatment on the Survival and Recurrence in Patients With Differentiated Thyroid Microcarcinoma

    Jasna Mihailović, Ljubomir Stefanović, Ranka Stanković (2013)
    ... thyroid microcarcinoma? Laryngoscope. 2011;121:1828Y1829. 31. IAEA-International Atomic Energy Agency. Nuclear Medicine in Thyroid Cancer Management. APractical Approach. Vienna, Austria: IAEA-International Atomic Energy Agency; 2009:63Y78. 32. Ogilvie JB, Patel KN, Heller KS. Impact of the 2009 American ...

  • Substitution reactions of some novel sterically hindered monofunctional Pd(II) complexes

    Aleksandar Mijatović, Jovana Bogojeski, Biljana Petrović, Živadin D. Bugarčić (2011)
    Reakcije supstitucije monofunkcionalnih kompleksa [(TLtBu)PdCl]+ i [Pd(tpdm)Cl]+, gde je TLtBu = 2,6-bis[(1,3-di-terc-butilimidazolin-2-imino)metil]piridin i tpdm = terpiridindimetan, sa nukleofilima kao što su: tiourea, I−, Br−, NO2−, piridin i dimetil-sulfoksid (DMSO) proučavani su u 0,1 M vodenom rastvoru NaClO4 u prisustvu 10 mM NaCl. Reakcije su sprovedene na tri različite temperature (288, 298 i 308 K) korišćenjem tehnike zaustavljenog protoka na različitim temperaturama. Reakcije supstitucije su praćene pod uslovima pseudo prvog reda sa velikim viškom nukleofila. Dobijeni rezultati pokazuju da kompleks ...
    Materials Chemistry, Inorganic Chemistry, Physical and Theoretical Chemistry
    ... reactivity of the complex. In order to determinate the affinity of [(TLtBu)PdCl]+ and [Pd(tpdm)Cl]+ complexes towards studied nucleophiles, a Linear Free Energy Relationship (LFER) was used. The relationship be- tween second-order rate constant, k2, and nucleophilicity con- stants of the nucleophiles (n0 Pt) ...
    ... [22] 1,4,7-Et3dien 932 ± 4 [22] 1,1,4-Et3dien 21.2 ± 0.3 [22] 1,1,7,7-Me4dien 0.28 ± 0.53 [22] 1,1,7,7-Et4dien 8.0 � 10�4 [22] Fig. 6. Linear Free Energy Relationship of [(TLtBu)PdCl]+ and [Pd(tpdm)Cl]+ com- plexes with different nucleophiles. A. Mijatović et al. / Inorganica Chimica Acta 383 (2012) ...

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • Development of a petrographic classification system for organic particles affected by self-heating in coal waste. (An ICCP Classification System, Self-heating Working Group – Commission III)

    M. Misz-Kennan, J. Kus, D. Flores, C. Avila, Z. Büçkün, N. Choudhury, K. Christanis, J.P. Joubert, S. Kalaitzidis, A.I. Karayigit, M. Malecha, M. Marques, P. Martizzi, J.M.K. O'Keefe, W. Pickel, G. Predeanu, S. Pusz, J. Ribeiro, S. Rodrigues, A.K. Singh, I. Suárez-Ruiz, I. Sýkorová, N.J. Wagner, D. Životić (2020)
    Self-heating of coal waste is a major problem in the leading coal-producing and consuming countries, independent of the recent or past coal exploitation history. The phenomenon of self-heating is dependent on many factors such as the properties of organic matter (maceral composition and rank), moisture and pyrite content, climate effects, and storage conditions (shape of the dump or compaction of the coal waste). Once deposited, coal waste undergoes oxidation, which can lead to self- heating with the overall temperatures ...
    Stratigraphy,Economic Geology,Geology,Fuel Technology

  • Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study

    Jelka Krušić, Biljana Abolmasov, Mileva Samardžić Petrović (2019)
    Debris flows induced by intensive rainfall represent very hazardous phenomena in many parts of the World. Methods for prediction of runout distance of flow like mass movements are different and depending on the input data, rheology, and available or appropriate numerical solution. However, sometimes it is not easy to obtain pre event and post event high-resolution data in the rural or mountainous area. Thus, the topology of terrain is the most important input parameter for the every real case ...
    tecišta, modeliranje, RAMMS, DEM
    ... dynamical models are independent from local conditions, since such models implement physical principles, like the conservation of mass, momentum and energy of bulk mixtures (Rickenmann, 2005). In this paper, results of RAMMS debris-flow dynamical method are tested, based on Voellmy (1955) approach ...

  • Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia

    Jelka Krušić , Biljana Abolmasov, Miloš Marjanović (2021)
    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 ...
    tecišta, zadržavanje nanosa, RAMMS, validacija

  • Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine

    Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)
    Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...
    raspoloživost, fazi teorija, AHP višekriterijumska analiza, eksperska ocena, buldozer
    ... bg.ac.rs (T.S.) 2 Faculty of Mechanical Engineering, University of Belgrade, 11000 Belgrade, Serbia; ubugaric@mas.bg.ac.rs 3 Ministry of Mining and Energy, 11000 Belgrade, Serbia; ivan.jankovic@mre.gov.rs * Correspondence: stevan.djenadic@rgf.bg.ac.rs; Tel.: +381-11-3219-195 Received: 17 September 2019; ...
    ... .bg.ac.rs (T.S.) Faculty of Mechanical Engineering, University of Belgrade, 11000 Belgrade, Serbia; ubugaric@mas.bg.ac.rs Ministry of Mining and Energy, 11000 Belgrade, Serbia; ivan.jankovic@mre.gov.rs * Correspondence: stevan.djenadic@regf.bg.ac.rs; Tel.: +381-11-3219-195 check for Received: 17 September ...
    ... and TR 33025. Acknowledgments: This paper was realized as a part of the projects: “Improvement of Lignite Open cast Technology in Order to Increase Energy Efficiency and Occupational Safety” (TR 33039), “Developed new methods for diagnosis and examination mechanical strucutures” (TR 35040) and a part ...

  • A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić (2023)
    This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...
    системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFIS

  • Analiza toplotne moći i Vobeovog indeksa prirodnog gasa različitog porekla

    Lana Mitrović (2024)
    U radu su prikazane najznačajnije osobine prirodnog gasa, uključujući hemijski sastav, jednačine sagorevanja i termodinamičke karakteristike koje predstavljaju osnovu za dalje razumevanje rada. Prikazane su količine prirodnog gasa na evropskom trţištu prema zemlji porekla, kao i njihove zasebne hemijske i termodinamičke karakteristike.Kvalitet prirodnog gasa u Republici Srbiji je posebno poglavlje u radu u okviru kog je detaljnjije opisano snabdevanje Republike Srbije prirodnom gasom, kao i zahtevani kvalitet.Na kraju, obuhvatajući sve prethodno navedeno, prikazan je postupak rešavanja Studije slučaja koja ...
    prirodni gas, toplotna moć, Vobeov broj, zahtevani kvalitet prirodnog gasa, namešavanje

  • An Approach to Management Decision Support: The Coal Mine Pljevlja Management Information System

    Božo Kolonja, Ranka Stanković, Filip Vuković, Ivan Obradović (2006)
    In this paper we describe the approach that has been used in the development of the Management Information System (MIS) in the Coal Mine Pljevlja in Montenegro. The methodology of this approach was based on new information technologies and management techniques which have already been successfully applied in other related fields. Its main goal was to introduce modern management techniques to mining, adapted to specific features of the mining industry, its operations and environment, thus enabling the tactical management ...
    ... g equipment, transport equipment, equipment for drilling- blasting works, coal preparation equipment, auxiliary machinery and equipment, electric energy installations, dumps, locations where data have been taken from, shifts, etc.). Respective jobs and operations are defined for each production ...

  • Analysis and visualization of geophysical well-logging data from closely spaced boreholes

    Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov (2024)
    Geophysical logging measurements for determining the condition of the rock mass on the dam profile and locating the predisposed directions of water circulation and loss from the reservoir were conducted in four boreholes distributed at a close distance. The survey was carried out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis ...
    well-logging in karst, water loss, data correlation, data fusion
    ... Jovanovski, Natasha Nedelkovska — O a 285 Enepruja, Đocu.inu ropuBa u Jar:tepojiHa HeyTpaJIHocT CEEGS PROJECT – A NEW PERSPECTIVE FOR GREEN ENERGY Jris Puković Kartal O a 293 CHCTEM 3A VIIPABVBAĐE CO KBAJIHTETOT HA JATJIEHMTE BO ITE PVJIHHILIH-PEK BHTOJIA Mapuja Manesa, Eanusaa6ema Mumpesecka ...

  • Upravljanje proizvodnjom nafte – novi alat na bazi fazi logike

    Мирослав Црногорац, Душан Даниловић, Лола Томић (2020)
    ... by conventional motor fuels; and non-renewable energy sources originating from petroleum. The use of methanol fits in with the concept of Energy Substitution, being applied globally. Keywords: methanol, alternative fuels, substitution of conventional fuels, energy sources. UVOD Metanol danas p ...
    ... речи: Геотермална енергија, хидрауличка бушећа гарнитура, пропорционални хидраулички разводник. Abstract: Geothermal energy is a significant energy resource of Serbia, so the energy efficiency of drilling rigs is important. The experience of companies and individuals in oil and gas drilling technology ...
    ... geothermal energy. The paper presents only individual subsystems of the drilling rig of the author 's own choice, which are important for: trade, use, maintenance and technical improvement of proportional technology during the continuation of cooperation.. Keywords: Geothermal energy, hydraulic drilling ...

  • 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 ...
    Kinetika, Ravnoteža, Ru(II), L-Histidin, Guanozin-5' -monofosfat, Dimetilsulfoksid, Tiourea
    ... standard HCl or NaOH solutions, as appropri- ate. All UV–Vis spectra show evidence of an intensive band between 280 and 300 nm and another lower energy broad band between 450 and 470 nm (Fig. 4). The spectral data were first evaluated with the aid of the computational program pHAb 2006 [49]. The ...
    ... of standard HCl or NaOH solutions, as appropri- ate. All UV-Vis spectra show evidence of an intensive band between 280 and 300 nm and another lower energy broad band between 450 and 470 nm (Fig. 4). The spectral data were first evaluated with the aid of the computational program pHAb 2006 [49]. The ...

  • Analiza uporednog praćenja temperature površine ohlađenih materijala pri njihovom zagrevanju do ambijentalne temperature

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Katarina Nestorović (2021)
    U datom eksperimentalnom radu su termografskim metodama ispitivane termofizičke karakteristike različitih materijala. Za ispitivanja su izabrani mesingani niovčić, ugalj i pelet, jer imaju različita termoizolaciona svojstava i različito stanje površine. Uzorci su najpre hlađeni, a zatim je njihovo zagrevanje na sobnoj temperaturi praćeno termalnom kamerom. U drugom delu eksperimenta, korišćena je impulsna termografija, a zagrevanje površine uzoraka vršeno je svetlosnom pobudom.
    termografija, impulsna termografija, nedestruktivno testiranje materijala, mesing, ugalj, pelet

  • Elektromagnetska sprega sistema litosfera-atmosfera-jonosfera

    Aleksandra B. Kolarski (2016-08-25)
    Radio talasi vrlo niskih frekvencija VLF (eng. Very Low Frequency) frekventnog opsega od 3 do 30 kHz, koji se prostiru talasovodom Zemlja-jonosfera (50 -90 km) su, kao što je poznato, efikasni i nezamenljivi u osmatranju pojava u niskoj jonosferi, sa tla...
    prostiranje talasa vrlo niskih frekvencija, talasovod Zemlja-jonosfera, globalno električno kolo, atmosfersko električno pražnjenje, kratkotrajne svetlosne pojave
    ... to 1.61011 m-3, while the dissipated energy is estimated to vary between 5.4 kJ and 714 MJ. VLF perturbations related to elve event occurrence with parent lightning peak current of 250 kA amount to electron density of 7107 m-3, with the dissipated energy estimated to 6 GJ. The present results ...
    ... appropriate time scales. In this study we focus on ionization changes that most dominantly affect the VLF wave propagation: the strong release of energy by atmospheric lightning discharges. The increased ionization along the propagation path is apparent in the perturbation (incr ...
    ... 1. Primer načina zapisa podataka o pražnjenjima registrovanih WWLLN mrežom Y/M/D Hr:Mn:sec.fract UT Lat () Lon () resid (s) nsta Energy (J) energy_ uncertainty (J) esta 2012/4/23 00:00:00.149517 26.5463 135.4961 13.2 9 2741.38 332.49 5 2012/4/23 00:00:00.834707 ...

  • Analiza rada električnih centrifugalnih pumpi

    Milica Stanojević (2024)
    Ovaj rad analizira rad električne centrifugalne pumpe (ESP) u naftnoj industriji, sa fokusom na problem taloženja kamenca (karbonatnih naslaga) unutar sistema. Električne centrifugalne pumpe (ESP) predstavljaju srce mnogih naftnih bušotina. Njihova visoka pouzdanost i sposobnost rada u zahtevnim uslovima čine ih neophodnim za stabilnu i kontinuiranu proizvodnju.Senzori igraju ključnu ulogu u praćenju rada ESP sistema i detekciji ranih znakova taloženja kamenca. Problem taloženja kamenca je izuzetno značajan, jer može dovesti do smanjenja efikasnosti pumpe, povećanja troškova održavanja, i dugoročnih zastoja ...
    električne centrifugalne pumpe (ESP), formiranje kamenca (karbonatnih naslaga), hemijski inhibitori
    ... h centifugalnih pumpi 4. Senzor i SCADA sistem Senzori u SCADA automatizaciji su komponente sistema automatizacije koje mere fizičke uslove (Energy Savers Technical Services LLC). Senzor meri sedam parametara, uključujući ulazni pritisak, temperaturu fluida, temperaturu namotaja motora, temperaturu ...
    ... 41 Analiza rada električnih centifugalnih pumpi s/Brochures/web/CorsairMotors-08-19.pdf?nav=en-US_artificial- lift public (23.10.2020). 14. Energy Savers Technical Services LLC, URL: https://www.energysavers.me/sensors/ 15.Mitra, N., 2012. „„Principles. of rtificial Liff”, URL: https://www ...

  • 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
    ... 56. Sevilla, M.; Fuertes, A.B.; Mokaya, R. High density hydrogen storage in super activated carbons from hydrothermally carbonized renewable organic materials. Energy Environ. Sci. 2011, 4, 1400–1410. [CrossRef] 57. Figueiredo, J.; Pereira, M.; Freitas, M.; Orfao, J. Modification of the surface chemistry ...
    ... and a high level of surface activity [33–35]. The major drawback of the conventional activated carbon-based adsorption process is the usage of non-renewable and relatively expensive raw materials (i.e., wood and coal), and therefore, it is still considered to be a high cost process with restricted app ...
    ... overcome such drawbacks and attain better economic viability, adsorption processes using non-conventional low-cost activated carbons derived from renewable and inexpensive materials such as naturally abundant biomass, saccharides, agricultural and industrial wastes have been examined by different researchers ...

  • Razvoj ARCGIS geobaze površinskog kopa korišćenjem UML CASE alata

    Aleksandra Tomašević, Ljiljana Kolonja, Ivan Obradović, Ranka Stanković, Olivera Kitanović (2012)
    ... This paper has been realized in the scope of the project “Improving the technology of open pit exploitation of lignite with the goal of enhancing energy efficiency, work safety and security” (Unapređenje tehnologije površinske eksploatacije lignita u cilju povećanja energetske efikasnosti, sigurnosti ...