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Упит dcterms_subject_txt:fluid loss control

351 items

  • A treatise about reliability in dating events of evolutionary history of brown trout Salmo cf. trutta (Actinopterygii) at Western Balkans: Impassable barriers, isolation of populations and assistance of geological timeframe

    Ana Marić, Danica Srećković Batoćanin, Dubravka Škraba Jurlina, Miloš Brkušanin, Jelena Karanović, Tamara Kanjuh, Vera Nikolić, Danilo Mrdak, Predrag Simonović (2023)
    Distribucija različitih haplotipova pastrmke u zavisnosti od geoloških dogadjaja.
    smeđa pastrmka, jadranska pastrmka, molekularni sat, evolucija, geološka istorija

  • Model inteligentnog sistema adaptivnog upravljanja procesom prerade rude

    Ivana M. Jovanović (2016-01-13)
    U oblasti procesa prerade rude, flotacijska koncentracija predstavlja jednu od najznačajnijih i najčešće primenjivanih metoda separacije korisnih od nekorisnih minerala. Samim tim, veoma je važno osigurati uspešan rad flotacijskog postrojenja kroz dostizanje zadovoljavajućih tehno-ekonomskih pokazatelja. Cilj upravljanja procesom flotacijske koncentracije je upravo optimizacija kvaliteta i iskorišćenja korisne komponente u koncentratu uz maksimizaciju profita. Shodno tome, istraživanja na polju modelovanja i upravljanja ovim procesom zauzimaju značajno mesto u praksi kontolnog inženjenringa.Teorijska istraživanja u okviru doktorske disertacije obuhvatila su analizu položaja ...
    flotacijska koncentracija, modelovanje, upravljanje, inteligentni sistem, soft kompjuting, fazi logika, veštačke neuronske mreže
    ... Supervisory control at Salvador flotation columns. Minerals Engineering Vol. 12, No. 7, pp. 733–744 19. Bergh, L.G., Yianatos J.B., 2011. The long way toward multivariate predictive control of flotation processes. Journal of Process Control 21, pp. 226–234 20. Bergh, L., Yianatos J., 2013. Control of rougher ...
    ... Hodouin, D., 2011. Methods for automatic control, observation, and optimization in mineral processing plants. Journal of Process Control 21, pp. 211–225 109. Holkar, K.S., Waghmare, L.M., 2010. An Overview of Model Predictive Control. International Journal of Control and Automation, Vol. 3 No. 4, pp. 47–63 ...
    ... . The purpose of the flotation process control is precisely the optimization of the concentrate grade and recovery, while maximizing profits. Consequently, research into the modelling and control of this process have always been an important area in control engineering practice. Theoretical research ...

  • Application of stochastic models for mine planning and coal quality control

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... planning and coal quality control Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Application of stochastic models for mine planning and coal quality control | Dejan Stevanović, Božo ...
    ... meet maximal efficiency of power plant and the environmental regulations. There is the need to control and to predict the quality of coal at the mine site to meet sulfur emission requirements. Coal quality control between the mine site and the utility plant is a complex problem owing to the variable nature ...
    ... s- tics of the original data are maintained. Coal quality control at the mine planning phase Mine planning is based on reliable estimates of coal grades of future mining blocks. Consequently, in order to develop any coal quality control strategy, the mine should have the ca- Stevanovi}, D. R., et ...

  • Modern self-propelled surface drill rigs for drilling small diameter holes in mining and construction operations

    Milanka Negovanović, Lazar Kričak (2021)
    Приликом одређених рударских или грађевинских радова потребно је извршити минирање применом бушотина малог пречника. Раније, бушење бушотина малих пречника се изводило углавном ручним бушилицама или лаким лафетним бушилицама нa одређеним нoсачима. Проблеми у овим случајевима били су капацитет бушења, бушење већих дужина бушотина и посебно безбедност оператера на неприступачним теренима, где је његово присуство било неопходно. Данас постоје модерне самоходне бушилице за бушење минских бушотина малог пречника, које су у потпуности даљински управљане. Радио даљинска контрола омогућава да се ...
    Бушилице,бушотине малог пречника, бушење, минирање,изградња,минирање негабарита, радио даљинска контрола

  • Implemented Stage Fracturing Technique To Improve Oil Production In Nubian Sandstone Of North Gialo, Libya

    Fandi Emad I. M., Leković Branko, Gazal Badees, Elhaddad Elnori, Al Saghr Abdulbaset (2018)

  • Implemented Stage Fracturing Technique To Improve Oil Production In Nubian Sandstone Of North Gialo, Libya

    Fandi Emad I. M., Leković Branko, Gazal Badees, Elhaddad Elnori, Al Saghr Abdulbaset (2018)

  • Geochemical and Sedimentation History of Neogene Lacustrine Sediments from the Valjevo-Mionica Basin (Serbia)

    Šajnović Aleksandra, Stojanović Ksenija, Simić Vladimir, Jovančićević Branimir (2012)

  • Maximizing the net present value by applying an optimal cut-off grade for long-term planning of the copper open pits

    Kržanović Daniel, Kolonja Božo, Stevanović Dejan (2015)

  • Production information system of the Pljevlja coal mine

    Božo Kolonja, Ranka Stanković, Filip Vuković (2018)

  • 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
    ...  Calculating friction loss: Darcy‐Weisbach formula vs. Hazen‐ Williams. www.vikongcorp.com (на енглеском)  188. Mathews, E.H., Kohler, P.A.J. 1995. A numerical optimization procedure for complex pipe  and duct network design. International Journal of Numerical Methods for Heat & Fluid  Flow 5(5),445‐457 ...
    ... frictional factor for  fluid flow in pipelines. Proceedings, Thirty‐Third Workshop on Geothermal Reservoir  Engineering, Stanford University, Stanford, California, January 28‐30, 2008, SGP‐TR‐185.  (на енглеском)  287. von Bernuth, R.D. 1990. Simple and accurate friction loss equation for plastic pipe ...
    ... 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 ...

  • Need to Improve the Natural Aggregate Resources Supply in the City of Belgrade (Serbia)

    Simić Vladimir, Abramović Filip, Andrić Nevena, Delić Ivana, Miladinović Zoran, Životić Dragana (2016)

  • VENTEX: An Expert System for Mine Ventilation Systems Analysis

    Ranka Stanković, Nikola Lilić, Ivan Obradović (1996)
    Analiza sistema za ventilaciju je komleksan proces, koji bazira na proračunu brojnih parametara, koji se odnose na: stanje mreže, provetrenost, stabilnost sistema, gubitke vazduha, klimatske uslove, gasno stanje, ugroženost od požara i opasne prašine. Navedeni problemi se uspešno rešavaju paketom SimVent, ali potpuno razumevanje i korišćenje dobijenih rezultata zahteva angažovanje iskusnog specijaliste iz oblasti ventilacije. Rešenje je nađeno u kreiranju ekspertnog sistema VENTEX, čija je baza znanja formalizacija ekspertskog znanja iz oblasti ventilacije rudnika. U radu je prikazana metodologija ...
    ekspertni sistem, ventilacija
    ... according to their relevance into the following categories: the ventilation network, aeration of the mine, stability of the ventilation system, air loss, climate conditions, mine gas state, fire risk and harmful dust risk. Once the parameter values are obtained the estimation process for the general ...
    ... interface) technology available for MS Windows applications /Fig. 11/. It enables a straightforward and easy manipulation of input data and control over parts of the problem- solving process. It also offers suggestions and recommendations to the user which could contribute to the improvement ...

  • Application of Gel for Water Shutoff: A Case Study of Kelebija Oil Field

    Irina Zahirovic, Petar Skrobonja, Dušan Danilović (2022)
    This paper focuses on the results of water shutoff operations using DSGA polymer gel in the Kelebija oil field. The methodology of candidate wells selection and the manner of performing the operation will also be included. The Kelebija oil field is characterized by a complex reservoir system with heterogeneous layers of different permeability and dual porosity, which led to the early breakthrough of water. For the last 25 years, average water cut was above 90%. Implementation of water shutoff ...
    intervención de pozos petroleros, reservoir characterization, production control, well logging, downhole intervention, enhanced recovery, complex reservoir, reservoir surveillance, water shut-off, upstream oil & gas

  • Environmental Noise Impact Assessment for Large-Scale Surface Mining Operations in Serbia

    Uros Pantelic, Petar Lilic, Aleksandar Cvjetic, Nikola Lilic (2023)
    Noise emissions are a significant environmental impact caused by the mining industry in all technological phases of surface mining, mineral processing, and waste disposal. This paper presents the role of noise impact assessment and control in large-scale surface mining operations. Mine planning develops the model of mining operations, ore excavation, and waste dumping scheduling and processing rates, including spatial distribution of mining activities. Such a level of mine planning requires an environmental impact assessment study. This can be achieved ...
    mine planning, noise impact assessment, mining, noise mapping, environmental impact assessment

  • 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

  • Freeze-dried nanocrystal dispersion of novel deuterated pyrazoloquinolinone ligand (DK-I-56-1): Process parameters and lyoprotectant selection through the stability study

    Jelena R. Mitrović, Maja Bjelošević Žiberna, Aleksandar Vukadinović, Daniel E. Knutson, Dishary Sharmin, Aleksandar Kremenović, Pegi Ahlin Grabnar, Odon Planinšek, Dominique Lunter, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2023)
    Recently, nanocrystal dispersions have been considered as a promising formulation strategy to improve the bioavailability of the deuterated pyrazoloquinolinone ligand DK-I-56-1 (7‑methoxy-2-(4‑methoxy-d3-phenyl)-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one). In the current study, the freeze-drying process (formulation and process parameters) was investigated to improve the storage stability of the previously developed formulation. Different combinations of lyoprotectant (sucrose or trehalose) and bulking agent (mannitol) were varied while formulations were freeze-dried under two conditions (primary drying at -10 or -45 °C). The obtained lyophilizates were characterized in terms ...
    Pharmaceutical Science
    ... the internal morphology of the product begins to change, resulting in significant changes in the specific surface area of the cake structure or loss of structure. It has been found that this parameter is usually about 2-5 "C higher than the corresponding Tg'. However, it has been shown that the ...
    ... RDI of about 95% was obtained in all formulations, but it dropped to values of 30-50% after only one month of storage. This was characterized as a loss of nanocrystalline structure. The highest RDI value in lyophilization-2 was achieved when sucrose and mannitol were used in a 3:2 ratio; it remained ...
    ... rigid structure of the cakes prevented instability problems during storage. An exception was the sample with sucrose only, which collapsed with the loss of structure. The observed collapse impaired the quality of the freeze-dried sample. Redispersibility is the most important parameter that indicates ...

  • SASA Dictionary as the Gold Standard for Good Dictionary Examples for Serbian

    Ranka Stanković, Branislava Šandrih, Rada Stijović, Cvetana Krstev, Duško Vitas, Aleksandra Marković (2019)
    У овом раду представљамо модел за избор добрих примера за речник српског језика и развој иницијалних компоненти модела. Метода која се користи заснива се на детаљној анализи различитих лексичких и синтактичких карактеристика у корпусу састављених од примера из пет дигитализованих свезака речника САНУ. Почетни скуп функција био је инспирисан сличним приступом и за друге језике. Дистрибуција карактеристика примера из овог корпуса упоређује се са карактеристиком дистрибуције узорака реченица ексцерпираних из корпуса који садрже различите текстове. Анализа је показала да ...
    Српски, добри примери из речника, аутоматизација израде речника, издвајање својстава, Машинско учење
    ... analysed various lexical and syntactic features of the gold standard examples, classified them and compared the results with the control corpus (both gold and control corpus are presented in Section 4). The initial set of features was inspired by Kilgarriff et al. (2008) and Kosem (2017), and guided ...
    ... delimiter between verses. In addition to the corpus made of examples, we prepared a control dataset derived from various texts, which was used as a sample corpus for dictionary example extraction. The control dataset of example candidates was obtained from the digital library Biblisha8 (Stanković ...
    ... delimiters and left/right context of up to 500 characters. The size of the control corpus was 30,104 sentences, comprising 908,980 words or 5,841,700 characters. A sample of 2,752 candidate examples (taken from all parts of the control corpus) was manually evaluated by two lexicographers: they evaluated ...

  • Long-term rockslope monitoring and rockfall prediction

    Miloš Marjanović, Biljana Abolmasov, Marko Pejić, Jelka Krušić (2021)

  • Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers

    Milan Bogdanović, Snežana Bogdanović, Dragoslav Rakić, Irena Basarić Ikodinović (2024)
    This paper presents a dynamic California Bearing Ratio (CBRd) device that can be used on a prepared pavement foundation layer to obtain a certain parameter of the tested material in the laboratory and in situ in a direct and fast way. For the selected natural material (gravel), it is shown that the laboratory CBRd can be used to estimate the compaction and bearing capacity, because it correlates well with the parameters of the standard and modifed Proctor compaction tests. ...
    korelacija parametara, donji slojevi saobraćajnica, laboratorijska i terenska ispitivanja, dinamički kalifornijski indeks nosivosti CBRd
    ... construction of the foundation layers of pavements. Control procedures are used to ensure the quality of construction, in accordance with the criteria defined by certain design regulations, specifications, and standards. In addition to compaction control, the basic measure for ensuring the quality of ...
    ... reported [4]. Owing to its short duration and ease, CBR, testing using a LWD can become widespread as an alterna- tive to the classic quality control method in the process of compaction or estimation of the substrate bear- ing capacity [5]. Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov ...
    ... estimate the soil compaction by comparing the in-situ CBR, results with predefined minimum values. Particularly, CBR, tests can be used for compaction control during the construction of the foundation layers of pavements (embankments). These tests offer the advantage of rapid investigation through the ...

  • A comparison between ARIMA, LSTM, ARIMA-LSTM and SSA for cross-border rail freight traffic forecasting: the case of Alpine-Western Balkan Rail Freight Corridor

    Miloš Milenković, Miloš Gligorić, Nebojša Bojović, Zoran Gligorić (2023)
    železnica, prekogranični teretni saobraćaj, ARIMA, LSTM, SSA