Претрага

Упит dcterms_subject_txt:fluid production

367 items

  • Long-term planning methodology for improving wood biomass utilization

    Vladimir Vukašinović, Dušan Gordić, Marija Živković, Davor Koncalović, Dubravka Živković (2019)
    The insufficiently developed forest management system is often followed by undeveloped forest resources supply chain and insufficient institutional support. These cause inefficient usage of fuel-wood as well as huge amounts of unused forest residues. In order to achieve optimal and long-term sustainable utilisation of biomass, an original methodology based on the interaction of mathematical optimization and backcasting approach has been developed. Mathematical optimization is used for both generation and consideration of techno-economic parameters of the forest biomass supply chain. ...
    Long-term planning methodology, Forest biomass, MINLP, Backcasting

  • 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 ...
    дубинске пумпе са клипним шипкама, замена, електрична потапајућа пумпа, производња, бушотина

  • Природни потенцијал минералних вода Србије - Natural potential of mineral waters in Serbia

    Оливера Крунић (2021)
    минералне воде

  • Ефикасност дистрибуције и коришћења природног гаса у домаћинствима

    Dejan Brkić (2010-03-30)
    Природни гас ће се у будућности све више користити као енергент за подмиривање грејних потреба становништва у српским градовима. Стога је потребно изнаћи најповољнији начин употребе природног гаса. Природни гас се може користити за подмирење грејних потреба становништва на два дијаметрално супростављена начина, и то директно, тако што би се гас директно уводио у зграде путем дистрибутивног система за снабдевање гасом и затим сагоревао у гасном котлу којим је сваки стан опремљен (гасни дистрибутивни систем), или индиректно, тако што ...
    prirоdni gаs, distribuciја gаsа,grејаnjе, cеvоvоdi, cеvоvоdnе mrеžе,fаktоr trеnjа pri prоtоku fluidа,urbаnizаm
    ... of wall roughness on friction factors for pipe and channel flows.  Journal of Fluid Mechanics 613, 35‐53. (на енглеском)  147. Holmgren, K., Amiri, S. 2007. Internalising external costs of electricity and heat  production in a municipal energy system. Energy Policy 35(10), 5242–5253. (на  енглеском)  ...
    ... on of the effect of surface  roughness and texture on fluid flow‐past, present, and future. International Journal of  Thermal Sciences 45(10), 962‐968. (на енглеском)  275. Ter Brugge, R. 1984. Spatial structure in relation to energy production and consumption.  Tijdschrift voor Economischeen Socia ...
    ... сти ε (која је својство саме цеви) зависи и од својстава флуида (вискозности и  густине  флуида),  aли  и  од  брзине  протока  флуида.  Поред  тога  у  појединим  режимима  ефективни утицај храпавости може да буде умањен из разлога што флуид формира танак  слој уз сам унутрашњи зид који у неку руку има ...

  • Development and Validation of Universal 3D Blast Fragmentation Model

    Veljko Lapčević, Slavko Torbica, Miloš Stojanović, Ivica Vojinović (2023)
    Fluid Flow and Transfer Processes, Computer Science Applications,Process Chemistry and Technology, General Engineering, Instrumentation, General Materials Science

  • Trace elements and garnet formation in a distal skarn zone: a case study of the Rudnik deposit, Central Serbia

    Bojan Kostić, Pavle Tančić, Natalija Batoćanin (2024)
    geohemija granata, retke zemlje, fluidne inkluzije, skarnovsko ležište Rudnik

  • Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy

    Milošević Maja, Zdravković Alena, Đordjević Biljana, Jelić Ivana (2021)
    ... 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 ...
    ... Cultural Heritage of Humanity. In technological terms, it is a unique phenomenon that actively coexists with discovery of new techniques and production processes. This brings to a rise in imitations of this pottery manufacture due to its enlarged popularity. The main goal of this work was to ...

  • 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)
    Polimeri i plastika, opšta hemija
    ... 73. George, S.C.; Lisk, M.; Summons, R.E.; Quezada, A.R. Constraining the oil charge history of South Pepper oilfield from the analysis of bearing fluid inclusions. In Advances in Organic Geochemistry1997, Part 1; Horsfield, B., Radke, M., Schaefer, R.G., Wilkes, H., Eds.; Pergamon Press: Oxford, UK ...
    ... Polym. Degrad. Stab. 1999, 66, 301–306. [CrossRef] 80. Arias, M.; Penichet, I.; Ysambertt, F.; Bauzab, R.; Zougagh, M.; Ríos, Á. Fast supercritical fluid extraction of low- and high-density polyethylene additives: Comparison with conventional reflux and automatic Soxhlet extraction. J. Supercrit. Fluids ...
    ... countries where this low-rank coal represents the main source of energy. Keywords: lignite; HDPE; co-pyrolysis; synergetic effect 1. Introduction Production of energy in Serbia is based on coal (50%), particularly lignite (92% of total coal resources) [1]. The main lignite deposits in Serbia are of Upper ...

  • E-Connecting Balkan Languages

    Cvetana Krstev, Ranka Stanković, Duško Vitas, Svetla Koeva (2009)
    In this paper we present a versatile language processing tool that can be successfully used for many Balkan languages. This tool relies for its work on several sophisticated textual and lexical resources that were developed for most of Balkan languages. These resources are based on several de facto standards in natural language processing.
    Query expansion, e-dictionary, wordnet, proper name, aligned text
    ... with harmonizing various heterogeneous lexical resources. Subsequently, many new features were added, particularly those that helped in the production and exploration of aligned texts on the basis of the incorporated lexical resources [9]. The new tool WS4QE (shortened for Work Station for ...
    ... Maurice Gross. The format of a DELAS-type dictionary basically consist of simple word lemmas accompanied with inflectional class codes which enable production of a DELAF-type dictionary which consists of all inflectional forms with their grammatical information. In Unitex environment one finite-state ...
    ... lemma corresponds to each inflectional class code. The Serbian morphological dictionary of simple words contains 121,000 lemmas which yield the production of approximately 1,450,000 different lexical words. Close to 87,000 simple lemmas belong to general lexica, while the remaining 34,000 lemmas ...

  • A Lexical Approach to Acronyms and their Definitions

    Cvetana Krstev, Duško Vitas, Ranka Stanković (2015)
    In this paper we present a comprehensive approach to acronyms for Natural-Language Processing (NLP) of Serbian texts. The proposed procedure includes extraction of acronyms and their definitions that are usual Multi-Word Units (MWUs), shallow parsing of MWUs that enables MWU lemmatization and production of entries in morphological electronic dictionaries, both for MWU and acronyms, that are provided with grammatical, syntactic, semantic and domain information. This approach enables representation that reflects complex relations between acronyms and their definitions.
    ... extraction of acronyms and their definitions that are usual Multi-Word Units (MWUs), shallow parsing of MWUs that enables MWU lemmatization and production of entries in morphological electronic dictionaries, both for MWU and acronyms, that are provided with grammatical, syntactic, semantic and domain ...
    ... lemmas produced in previous steps. For this we are using inflectional transducers for MWU lemmas (de- scribed in (Savary, 2009)) and a tool for production of proper MWU e-dictionary lemmas that provide all neces- sary information for inflection (Krstev et al., 2010). This tool for items produced ...

  • Geoenvironmental Investigations at a Smelter Location in Bor (Serbia)

    Petar Papić, Zvonimir Milijić, Jana Stojković, Jovana Milosavljević, Maja Todorović, Marina Ćuk, Željko Kamberović (2014)

  • Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine

    Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)
    The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...
    Fuzzy theory, hydraulic excavator, selection, quality of service, asset management

  • 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 ...
    дубинска пумпа, оптимизација, производња, потисни вентил
    ... (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 ...
    ... ceJuIrTa. Cenmrra cy rpHkKayaaHa Ha c/n/u 3.7. Canuka 3.7 Ipukas MexaHuuko? u MaH2iCemH0oo ,, Cup“ mun ceOuuma ( Production Technology/API Subsurface Pump Designation, URL: https://production-technology.org/api-subsurface-pump-designation/ ) 18 3.1.4.2. Tyounr nymrne KoHcrTpykKnoHo pentepbe TyOHHT ...

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija

  • Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije

    Jelena Majstorović-Necković, Vladimir Čebašek, Veljko Rupar (2023)
    Ispitivanja stena kao radne sredine, odnosno materijala sa kojim se gradi, na kome se gradi i u kome se gradi, svojom složenošću zahteva njeno svestrano izučavanje po velikom broju parametara. Zadatak Mehanike stena je da što bolje upozna ponašanje stenske mase i njenu otpornost na dejstvo pritiska, zatezanja i smicanja, kao i dinamičkih svojstava. Poznavanje navedenih parametara i njihova korelacija omogućavaju pouzdaniji izbor parametara za projektovanje danas sve zahtevnijih uslova kako podzemne, tako i površinske eksploatacije. U ovom radu ...
    mermer, jednoosna čvrstoća na pritisak, čvrstoća na istezanje, brzina longitudinalnih elastičnih talasa, korelacija

  • The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia

    Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić (2019)
    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 ...
    landfill, geotechnical investigations, transfer station
    ... 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 performance is presented within this paper. ...

  • Old or New, We Repair, Adjust and Alter (Texts)

    Cvetana Krstev, Ranka Stanković (2020)
    U ovom radu predstavljamo kako se e-rečnici i kaskade transduktora konačnih stanja implementirani u alatu Unitex mogu koristiti za rešavanje tri problema transformacije teksta: ispravljanje tekstova nakon OCR-a, vraćanje dijakritičkih znakova i prebacivanje između različitih jezičkih varijanti.
    ispravka teksta, OCR greške, restauracija dijakritika , jezičke varijante, elektronski rečnik, transduktori konačnih stanja
    ... type are lan- guage dependent and are the result of user’s (mis)understanding of relevant orthographic rules. Both types of errors can result in production of either valid (but not intended) or invalid words. Akin to typing errors, OCR errors are local: one or more characters are erroneously recognized ...
    ... N+Hum:mp2v kupaca,.X+CR=kupača(2) ⇒ SMD_DR kupaća,kupaći.A:aefs1g kupaca,.X+CR=kupaća(1) kupaca,.X+CR=kupaca(21)_kupača(2)_kupaća(1) Table 4. Production of an entry in SMD_DR Relative frequencies in SrpKor were calculated and assigned to each can- didate for correction in order to facilitate calculation ...
    ... explained in (Lazić and Škorić, 2019), specific rules were developed for linking corresponding Ekavian and Ijekavian entries. This enabled the production of two specific dictionaries: Ijk2Ek for transforming an Ekavian text to Ijekavian, and Ek2Ijk for the transformation in the other direction. Lemmas ...

  • Classification of Terms on a Positive-Negative Feelings Polarity Scale Based on Emoticons

    Mihailo Škorić (2017)
    The goal of this paper is to draw attention to the possibility of using emoticon-riddled text on the web in language-neutral sentiment analysis. It introduces several innovations in the existing framework of research and tests their effectiveness. It also presents a software tool especially made for that purpose, explains how it builds a database with sentimental value of terms and offers the user manual. Finally, it presents a software tool that tests the new database and gives some examples ...
    data mining, information extraction, emotions, text on the web
    ... switch to the sec- ond part of the extraction, which is done by pressing ekstraktuj vrednosti iz teksta (extract values from the text) button on the production tab (Fig- ure 7). Before pressing this button the user can also, optionally, check the field Koristi predodredene regularne izraze za pobolǰsanu ...
    ... Vol. 17, No. 1, 2017 Scientific paper Figure 6. Message appearance before and after extraction of determiners. Figure 7. Step by step database production tab. text content (beside the determiner5) and the content of the previous and following messages, there are three types of segments values allocation: ...
    ... light to move on. 3.4 Transliteration and reduction These two steps are done together by pressing transliterǐsi (transliterate) button of the production tab. The purpose of this step is to get a clean out text for the creation of the database. In this case, the text is considered to be Infotheca ...

  • 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 ...
    zavojne pumpe, oprema, primarne mehaničke metode, ugljovodonici, analiza rada
    ... Last Node Temperature dP Friction - Production String dP Gravity - Production String Cumulative Transit Time - Producti... Radna tačka pumpe je u oblasti efikasnosti od 78%, pri nominalnom broju 3 obrtaja od 100 rpm. Predviđena teorijska proizvodnja fluida je 16 mT. Ispod je prikazan dijagram ...
    ... W R R . . [ [ 0 % Rod String Production Tubing :i Slika 11 Glatka šipka (Jake S., 2015) 2.5 „Prednostii nedostaci Kao što je napomenuto ranije, stator zavojnih pumpi je izgrađen od elastomera koji omogućava da pumpa transportuje abrazivne fluide, u slučaju naftne industrije, nafte ...
    ... priložene slike se zelenim strelicama može videti utok fluida u bušotinu. Isprekidana plava linija na dnu predstavlja sredinu perforacije. 3.3 IPR kriva i profil fluida Na osnovu merenja tokom proizvodnje fluida, izgrađen je profil fluida koji se na osnovu korelacija upotrebljava radi preciznije ...

  • Inhibitory effect of platinum and ruthenium bipyridyl complexes on porcine pancreatic phospholipase A2

    Tina Kamčeva, Jörg Flemmig, Bojana Damnjanović, Jürgen Arnhold, Aleksandar Mijatović, Marijana Petković (2011)
    Fosfolipaza pankreasa A2 (PLA2) igra važnu ulogu u ćelijskoj homeostazi kao iu procesu karcinogeneze. Efekti metalo-lekova koji se koriste kao hemoterapeutici na aktivnost ovog enzima nisu poznati. U ovom radu, interakcija između PLA2 svinjskog pankreasa i dva odabrana kompleksa prelaznih metala — tetrahloro(bipiridin) platine(IV) ([PtCl4(bipi)]) i dihloro (bipiridin) rutenijum(III)hlorida ([RuCl2(bipi)2) ]Cl)—proučavana je. Laserska desorpcija/jonizacija uz pomoć matriksa, vremenska masa spektrometrija (MALDI-TOF MS) i fluorescentna spektroskopija korišćeni su za analizu aktivnosti enzima u odsustvu i prisustvu metalnih kompleksa i za ...
    Metals and Alloys, Biochemistry, Biomaterials, Biophysics, Chemistry (miscellaneous)
    ... PLA2 belongs to the type I PLA2 enzymes that have been shown to elicit receptor-mediated cellular responses such as stimulation of prostaglandin production, secretion of steroid hormones,4–6 cell proliferation,7–9 and vascular smooth muscle contraction.10 In the formation of arachidonic acid and derived ...
    ... 2011 Metallomics, 2011, 3, 1056–1063 1057 activity, which might cause significant changes in the subse- quent processes of membrane remodeling and production of important regulatory molecules in host defense against tumor cells. Thus, detailed knowledge of interaction between phos- pholipase A2 and ...
    ... 19/12/2017 15:32:07. View Article Online activity, which might cause significant changes in the subse- quent processes of membrane remodeling and production of important regulatory molecules in host defense against tumor cells. Thus, detailed knowledge of interaction between phos- pholipase Az and me ...