Претрага
134 items
-
Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy
... are of random orientation and size, indicating slower rotations of the potter’s wheel during the manufacturing process. Sample 2 has a specific fluid-structure that is consistent with the way it was fabricated. By the size and orientation of the pores, it is evident that the pot was manufactured ...
... Ground mass is a clay mixture uniformly distributed with larger, mostly rounded pores, consistent with microscopical observations. Sample 2 has a fluid- like structure where both groundmass and pores have a directional appearance, consistent with previous observations, and a slightly higher amount ...Milošević Maja, Zdravković Alena, Đordjević Biljana, Jelić Ivana. "Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy" in 8th Mineral Sciences in the Carpathians Conference, Acta Mineralogica-Petrographica, Miskolc, Hungary, Department of Mineralogy, Geochemistry and Petrology, University of Szeged, Szeged, Hungary (2021)
-
Poreklo asocijacije Ni, Ag i Sn minerala u polimetaličnom ležištu Rudnik
Rudnomikroskopska, SEM-EDS i LA-ICP-MS ispitivanja rudne mineralizacije iz Pb-Zn-Cu-(Ag) ležišta Rudnik, ukazala su na lokalno prisustvo specifične asocijacije minerala nikla, srebra i kalaja, deponovane u tektonskoj breči, arsenopiritsko-pirotinskim, piritsko-pirotinsko-arsenopiritskim i kvarcno-sulfidnim žicama u harcburgitima. U tektonskoj breči deponovan je polimineralni sulfidni agregat kojeg čine pirotin (50), galenit, sfalerit i halkopirit. Arsenopiritsko-pirotinske žice odlikuje dezintegrisani agregat arsenopirita cementovan sa pirotinom. U piritsko-pirotinsko-arsenopiritskim žicama masivni pirit (50%) prorasta sa arsenopiritom i cementovan je polimineralnim agregatom pirotina, galenita i sfalerita. Minerali nikla, srebra ...Stefan Petrović, Aleksandar Pačevski, Viktor Bertrandson Erlandson, Rade Jelenković. "Poreklo asocijacije Ni, Ag i Sn minerala u polimetaličnom ležištu Rudnik" in 18. Kongres geologa Srbije "Geologija rešava probleme", Divčibare, 01-04 jun 2022., Srpsko geološko društvo (2022)
-
Збирка задатака из физике - за студенте Рударско-геолошког факултета
Весна Дамњановић (2014)Весна Дамњановић. Збирка задатака из физике - за студенте Рударско-геолошког факултета, Београд : Универзитет у Београду, Рударско-геолошки факултет, 2014
-
Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention
Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol InjectionMilica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović. "Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention" in Underground Mining Engineering, Beograd : Rudarsko-geološki fakultet (2023)
-
Double traveling valve increases rod-pump efficiency
Traditional sucker rod pumps (SRP) use a single traveling valve, but recent double traveling valve innovations have improved SRP performance and efficiency in field applications with double traveling valves installed in pumps with top mechanical seating. The valves sealed better and produced similar fluid volumes compared with the previous single-valve pumps. They also enabled a reduction in pump diameter and optimized usage of surface equipment. Overall, the double travel valve SRPs produced stable production rates and annual production targets.Miloš Petrović, Bojan Martinović, Milica Ješić, Miroslav Crnogorac. "Double traveling valve increases rod-pump efficiency" in Oil & Gas Journal (2023)
-
Geotermalne karakteristike područja Semberije , Republika Srpska
Igor Glavaš (2024)Cilj završnog rada predstavlja, opis geotermalnih karakteristika područja Semberije, Republika Srpska, BiH.Rad se sastoji od opšteg dijela u kojem se navode osnovne karakteristike područja (geomorfološke, geografske, hidrološke,hidrometeorološke, geološke, tektonske i hidrogeološke) i specijalnog dijela koji detaljnije ulazi u tematiku osobina geotermalne energije i njihovih karakteristika u zadatom području kao i definisanje geotermalnog potencijala koje to područje ima.Sa prognoznim litološkim profilima 6 dubokih istražnih bušotina su izrađena 2 regionalna geološka, a njegovom konverzijom i hidrogeološka profila na osnovu kojih je, stečena ...... resursa prema temperaturi fluida odnosno entalpiji — unutrašnjem sadržaju toplotne energije Podjela po Benderitter i Cormy 1990. godine: a) Geotermalni resursi niske entalpije, temperature fluida < 100 *C b) Geotermalni resursi srednje entalpije, temperature fluida 100 - 200 'C c) Geotermalni ...
... izražen je kroz Furijeov zakon: 2) Indirektan: o Konvekcija je transport toplote koji se javlja uslijed osobine fluida za kretanjem, dakle prenos toplote kretanjem masa molekula fluida sa Jjednog mjesta na drugo, objašnjeno kroz Njutnov zakon hlađenja: Porijeklo termalnih voda u krednim i trijaskim ...
... geotermalnog gradijenta sa porastom dubine 2) Rezervoar je topla vodopropusna stijena iz koje cirkulišući fluid „izvlači“ toplotu i predlaže se da se nazivaju estiferi, može biti vještački 21 3) Fluid koji prenosi toplotu u najčešćem broju slučajeva su podzemne vode meteorskog (atmosferskog) porijekla ...Igor Glavaš. Geotermalne karakteristike područja Semberije , Republika Srpska, 2024
-
Primena kiselinskih obrada u cilju poboljšanja karakteristika kolektor stena
U toku eksploatacionog veka jednog ležišta različiti uticaji uzrokuju nastanak oštećenja stena koje se nalaze u pribušotinskoj zoni. Oštećene stene se odlikuju začepljenjem pornog prostora koje se manifestuje smanjenom propusnošću, pa se kao posledica toga javlja pad proizvodnje fluida. U cilju rešavanja ovog problema postoje različite stimulativne metode koje se sa uspehom primenjuju širom sveta. U Srbiji postoji praksa, da se prilikom rešavanja problema oštećenja stena najčešće koriste tretmani kiselinskih obrada. Ove metode se zasnivaju na primeni kiselinskih rastvora ...Natalija Burgić, Dušan Danilović, Branko Leković. "Primena kiselinskih obrada u cilju poboljšanja karakteristika kolektor stena" in Tehnika, SMEITS (2022)
-
Productivity improvement with use of beam gas compressor: pilot test in Southeastern Europe mature field
Most of the wells in the oilfield Turija are operating with sucker rod pumps, where casing pressure at around 15 bar, and with marginal production rates. The high value of casing pressure indicates high pressure on the face of the formation and depends directly on well productivity. In addition, with increasing value of the casing pressure gas column in the annulus is moving the dynamic fluid level near pump intake and more gas is entering the pump, it results ...beam gas compressor, BGC, increase productivity, sucker rod pump, SRP, mature field, artificial lift, production optimisationBojan Martinović, Dušan Danilović, Branko Grubač, Robert Fadiga. "Productivity improvement with use of beam gas compressor: pilot test in Southeastern Europe mature field" in International Journal of Oil Gas and Coal Technology (2022)
-
Termičke metode povećanja iskorišćenja naftnih ležišta
Vesna Karović Maričić (2019)Vesna Karović Maričić. Termičke metode povećanja iskorišćenja naftnih ležišta, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet, 2019
-
Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study
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 ...... (the term containing / which extensively controls deceleration behaviour of a more slowly moving flow. The resistance of the viscous or turbulent fluid phase (the term including / prevails for a more quickly moving flow (Bartelt et al., 2013). Figure 1 The topography Z(X, Y) is given in the Cartesian ...
... flows. Natural Hazards 19: 47-77. Savage SB, Hutter K (1989) The motion of a finite mass of granular material down a rough incline. Journal of Fluid Mechanics 199 (1): 177-215. Schraml K, Thomschitz B, Mcardell BW, Graf C, Kaitna R (2015) Modeling debris-flow runout patterns on two alpine fans ...
... Central Alps). Engineering Geology 100 (1-2): 11-26. Takahashi T (2007) Debris Flow: Mechanics, Prediction and Countermeasures. Annual Review of Fluid Mechanics 13 (1): 57- 77. Voellmy A (1955) Über die Zerstörungskraft von Lawinen. Schweizerische Bauzeitung 73: 212–285 Wu W (2015) Recent advances ...Jelka Krušić, Biljana Abolmasov, Mileva Samardžić Petrović. "Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study" in 4th Regional Symposium on Landslides in the Adriatic Balkan Region, 23-25 October 2019, Sarajevo, Bosnia and Herzegovina, Geotechnical Society of Bosnia and Herzegovina (2019). https://doi.org/ 10.35123/ReSyLAB_2019
-
Industrial Waste Heat Potential for Meeting Heat Demand in the Republic of Serbia
Dejan Ivezić, Marija Živković (2023)Finalna potrošnja energije u industrijskom sektoru čini skoro 25% finalne potrošnje energije u Republici Srbiji. Procenjuje se da je 50-70% potrošnje energije u industriji namenjeno proizvodnji toplotne energije u različitim industrijskim procesima. Deo proizvedene toplotne energije se nepovratno gubi kao energija odvedena u okolinu: prenosom toplote kroz zidove procesne opreme, dimnim gasovim, otpadnim vodama itd. Korišćenjem otpadne toplote povećava se efikasnost korišćenja primarne energije i smanjuje ukupna potreba za energijom. Otpadna toplota se može koristiti u samom industrijskom objektu ...Dejan Ivezić, Marija Živković. "Industrial Waste Heat Potential for Meeting Heat Demand in the Republic of Serbia" in Energija, ekonomija, ekologija (2023). https://doi.org/10.46793/EEE23-1.17I
-
Primena termografije u rudarstvu
Stevan Đenadić, Vesna Damnjanović, Predrag Jovančić, Dragan Ignjatović, Dragutin Jovković, Filip Miletić (2019)Danas, gotovo da nema oblasti u nauci i tehnici u kojoj se Infracrvena termografija ne primenjuje kao metoda za lociranje i praćenje zagrejanih objekata ili tela, beskontaktnu procenu temperature površina, i nedestruktivno ispitivanje materijala. U radu su prikazane mogućnosti i perspektive primene ove metode u oblasti rudarstva.... [20] U proizvodnji nafte može se vršiti kontrola visine fluida u rezervoarima i začepljenja u cevima naftovoda (Slike 9, 10 i 11). Slika 9. Nivo fluida u rezervoaru [21] Slika 10. Separator, nivo čestica (peska) i fluida (nafte i vode) [22] 63 Slika 11. Ograničenje protoka ...Stevan Đenadić, Vesna Damnjanović, Predrag Jovančić, Dragan Ignjatović, Dragutin Jovković, Filip Miletić. "Primena termografije u rudarstvu" in IX Međunarodna konferencija UGALJ 2019, Zlatibor, Srbija, 23-26. oktobar 2019., Jugoslovenski komitet za površinsku eksploataciju (2019)
-
Epidotizacija sanidina u kvarclatitima Grota
Propilitska alteracija je veoma česta u gornjokredno-tercijarnim vulkanitima Srbije. Kvarclatiti Grota, otkriveni na dubini od oko 550 m u jednoj od istražnih bušotina su holokristalaste porfirske strukture sa fenokristalima sanidina dimenzija i do 1,5 x 2 cm. Optičkim ispitivanjima su u kvarclatitu potvrdjeni i elementi sitaste, pojkilitske i glomeroporfirske strukture. Kao fenokristali prisutni su sanidin, plagioklas, kvarc, biotit i amfiboli. Sekundarni minerali su hlorit, epidot, coisit, Fe-hidroksidi, redak kalcit i ilit. U fenokristalima sanidina se zapažaju „lepeze“ izduženih kristala ...Danica Srećković-Batoćanin, Suzana Erić, Nikola Novičić, Nikola Pašajlić, Natalija Batoćanin. "Epidotizacija sanidina u kvarclatitima Grota" in III Congress of Geologists of Bosnia and Herzegovina with international participation, Neum, 21. – 23.09.2023, Ilidža : Udruženje/udruga geologa u Bosni i Hercegovini (2023)
-
Одређивање оптималне производње дубинске пумпе на клипним шипкама
Небојша Савић (2024)Дужи временски период током историје производње нафте, дубинске пумпе на клипним шипкама су први и у многим случајевима једини избор када су у питању механичке методе експлоатације. Правилан одабир сваког појединачног елемента система омогућава оптимизацију која са собом повлачи бенефите у виду повећавања ефикасности и смањења трошкова. Тренутно примењени систем дубинских пумпи на клипним шипкама на лежишту „Н“ обезбеђује стабилну производњу и реализацију годишњих планова производње без већих проблема. У овом раду је приказан начин оптимизације производње дубинским пумпама ...... (Motor->Pump) 16% BOIa 126-(318mm;) | Pemmissibe Load Power(kWX | 168 | Oc ag 80% las Fiuid load on pump (N}- dMOp FOMA JPLHE" 032 Fluid Properties Motor & Power Meter Fluid level tvd (m from surface) 15488 | Buoyanirod weight(N) 44136 Pot Rođ Power (KW\- 54 NMNO: 153 , Fo/SKr 201 Water cut 78% Power ...
... 2 % - | Pemnssible Load Power (KW): — 9 HHAORKORMANJI )79% Pol rod. dlam 125'(318mm) | Fludloadon (NE 18012 | PRHP/PLUHP: 030 Fluid Propemes Motor & Power Meter Fluid levei tvd (m from surface): 15488 | Buoyantrodweight(N): 44136 | Pol, Rod Power (KW) 27 NMO: 082 , Fo/SKr 201 Watercut 78% Power ...
... KOHCTDpyKIHJE Ba)KeC H 34 HOTHCHH BCHTHJI, Ca THM Jla y CJIyuajy yrpajupe JIyILTOr IOTHCHOT BEHTHIIa KaJla IIyMra pajua O0e3 HHBO4d, TaKO3BaHH „fluid pound“, KyrmHma H CeHHITcC TOpM5er BCHTHJIA Cy saamruHheHHM OM MeXaHMuKor omrTehema IpHJMKOM HarHc IHIDpOMeĆHC IIpHTMHMCKa TIDHJIHKOM yjlapa rummMHNpa ...Небојша Савић. Одређивање оптималне производње дубинске пумпе на клипним шипкама, 2024
-
Epidotized sanidine in quartzlatites from Grot
Propilitska alteracija je veoma česta u gornjokredno-tercijarnim vulkanitima Srbije. Kvarclatiti Grota, otkriveni na dubini od oko 550 m u jednoj od istražnih bušotina su holokristalaste porfirske strukture sa fenokristalima sanidina dimenzija i do 1,5 x 2 cm. Optičkim ispitivanjima su u kvarclatitu potvrdjeni i elementi sitaste, pojkilitske i glomeroporfirske strukture. Kao fenokristali prisutni su sanidin, plagioklas, kvarc, biotit i amfiboli. Sekundarni minerali su hlorit, epidot, coisit, Fe-hidroksidi, redak kalcit i ilit. U fenokristalima sanidina se zapažaju „lepeze“ izduženih kristala ...Danica Srećković-Batoćanin, Suzana Erić, Nikola Novičić, Nikola Pašajlić, Natalija Batoćanin. "Epidotized sanidine in quartzlatites from Grot" in Book of Abstracts, III Congress of Geologists of Bosnia and Herzegovina with international participation, Neum, 21. – 23.09.2023, Ilidža : Udruženje/udruga geologa u Bosni i Hercegovini (2023)
-
Phase relations and physical indicators of municipal waste from old landfills in Serbia
Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science... the risk of combustion of some materials at higher temperatures). Municipal waste moisture content can be observed based on the mechanism of fluid retention within the pore space of waste: a) moisture within waste particles 1.e. moisture in pores inside particles, b) moisture between particles ...
... between particles and c) moisture that waste particles with low hydraulic conductivity retain (Figure 4). EO a) b) c) Fig. 4. Different types of fluid within the pore space of waste (Zornberg et al., 1999). Very wide intervals of municipal waste moisture can be found in the literature. As a rule ...
... this, we can specify “PET” packaging, or a can whose unit weight is Y=2 kN/m? when it is empty, or around y = 12 kN/m* when it is filled with fluid, and when it is compressed under high pressures its unit weight is approximate to a metal unit weight from which it is produced. For municipal ...Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić. "Phase relations and physical indicators of municipal waste from old landfills in Serbia" in Japanese Geotechnical Society Special Publication, The Japanese Geotechnical Society (2021). https://doi.org/10.3208/jgssp.v09.cpeg016
-
Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs
John Nyame (2024)The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...... for production. The carbon dioxide from the fluid produced at surface is separated and the cycle starts again. CO» flooding is a common method for enhanced oil recovery as the gas mixes with the oil to expand and reduces the viscosity to move the fluid to the production stream [18]. Two common ...
... stops, solubility trapping where parts of the injected CO2 will dissolve into the saline fluid that is present in the pore spaces within the rock and mineral trapping: where dissolved CO- in the saline fluid reacts with the minerals in the rock. Mineral trapping is deemed the most secure form of ...
... power into the system per unit mass. This power input is supplied at the pumps to boost the CO2, the working fluid, and the heating medium: W'input= Žiw'pumpcoz, IL+ zl·W-pumpworking fluid. | + zl·W-pumphcaling medium»(sw) i (4) The thermal efficiency refers to energy efficiency, specifically to ...John Nyame. Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs, 2024
-
Примена ПСП пумпи за експлоатацију вискозних флуида
Алекса Трифуновић (2024)Производња парафинске нафте се током историје одвијала уз помоћ дубниских клипних пумпи, све до појаве ПСП система који су показали боље каратеристике и већу ефикасност. Функционални дизајн пумпе омогућава производњу вискозних и абразивних мултифазних флуида, уз ниска капитална улагања. У раду је анализирана проблематика рада укључују губитке протока флуида, производњу песка, оштећење клипних шипки и тубинга и сам притисак на дну бушотине. Рађена је студија случаја за нафно лежиште „М“ у коме је приказан цео производни век почевши од ...... 2024-09-18 10:46:16 Примена ПСП пумпи за експлоатацију вискозних флуида Алекса Трифуновић Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Примена ПСП пумпи за експлоатацију вискозних флуида | Алекса Трифуновић | | 2024 | | http://dr.rgf.bg.ac.rs/s/repo/i ...Алекса Трифуновић. Примена ПСП пумпи за експлоатацију вискозних флуида, 2024
-
Mineralogical Discrimination between Authentic and Recent Imitations of Pottery Manufacture in Zlakusa, Serbia
... 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 showed that in this ...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)
-
Sastav i teksture minerala FeO-Fe2O3-TiO2 sistema u vulkanskim stenama i porfirskim ležištima bakra Borske metalogenetske zone
Aleksandar Luković (2021)Proces obrazovanja minerala iz sistema FeO-Fe2O3-TiO2 u uzorcima vulkanskih stena i porfirskih orudnjenja borske zone prikazan kroz pojavu magnetita/hematita i njihovih alteracija. Minerali ove zone su ispitivani optičkim metodama (odbijena i propuštena svetlost), SEM-EDS/BSD, XRPD, LA-ICP-MS metodama. Rezultati ispitivanja su, pored glavnih Fe – Ti oksida, otkrili prisustvo ferijskog ilmenita u hornblenda andezitima I vulkanske faze kao i magnetita sa većim koncetracija Cr u zoni zlotske magnetne anomalije. Ispitivanje uzoraka iz bušotina porfirskih sistema borske zone otkriva postojanje nekoliko ...... ije magmatskog rastopa. Precipitiacijom hidrotermalnih fluida obogaćenih mineralnim komponentama dolazi, pod povoljnim uslovima (ƒO2, ƒS, temperature), do formiranje magnetitske faze. Za razliku od magmatske faze, sastav hidrotermalnog fluida direktno je kontrolisan prethodno formiranim mineralima ...
... Romanian J. of Mineral Deposits, 79/2, 112-113. Velojić, M., Jelenković R., & Cvetković V., (2020): Fluid Evolution of the Čukaru Peki Cu-Au Porphyry System (East Serbia) inferred from a fluid inclusion study. Geologia Croatica, vol.73 No.3, 197-209. Verhoogen, J., (1962): Oxidation of Iron-Titanium ...
... ilmеnitа rutilоm, аnаtаsоm i/ili finоzrnim titаnоnоsnim аgrеgаtоm lеukоksеnоm, zаtim, zаmеnjivаnjе mаgnеtitа piritоm pоd dејstvоm hidrоtеrmаlnih fluidа, itd. Upеčаtlјivе tеksturе zаmеnjivаnjа оvih minеrаlа nаrоčitо sе čеstо оbrаzuјu u hidrоtеrmаlnim аltеrаciјаmа stеnа, uslеd čеgа оnе mоgu dа ukаzuјu ...Aleksandar Luković. Sastav i teksture minerala FeO-Fe2O3-TiO2 sistema u vulkanskim stenama i porfirskim ležištima bakra Borske metalogenetske zone, Beograd : [A. Luković], 2021