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Упит dcterms_subject_txt:Rastvorne soli

524 items

  • 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
    ... čvrste i tečne, tečne i gasovite faze [mJ/m2]. Na hidrofobnost materijala se može uticati posredstvom različitih reagenasa (kiseline, baze, soli, organska jedinjenja) koji se dodaju u pulpu. Njihovo dejstvo može se objasniti pomoću Jungove jednačine, s obzirom da oni mogu izmeniti stanje sve ...
    ... ADAPTIVNOG UPRAVLJANJA PROCESOM PRERADE RUDE UNIVERZITET U BEOGRADU, RUDARSKO-GEOLOŠKI FAKULTET 7 modifikatori elektroliti (pH regulatori i soli) reagensi za hidrofilizaciju površina kolektori početni ugao dodira u g ao d o d ir a, θ 0 cosθ = γsg – γsc γcg γsg, γsc, γcg γcg ...
    ... ispoljavaju jako dejstvo na kontaktnoj površini čvrsto-gasovito, surfaktanti na kontaktnoj površini tečno-gasovito, a elektroliti (regulatori pH i soli) na kontaktnoj površinu čvrsto-tečno. Stepen izmene odgovara veličini simbola [Drzymała (2007)]. Uspešnost procesa flotacije zavisi u prvom redu ...

  • Еоценска фауна југозападног дела Сирт басена (Либија)

    Љупко Рундић, Мери Ганић (2020)
    Еоцен, крупни мекушци, нумулити, ЈЗ Сирт басен, Либија

  • Upravljanje resursima podzemnih voda severne Bačke

    Bojan B. Hajdin (2013-03-07)
    Vodosnabdevanje gradova i naselja severne Bačke vrši se u potpunosti iskorišćavanjempodzemnih voda. Najznačajnije količine podzemne vode namenjene za piće zahvatajuse iz izdani u vodonosnim pleistocenskim naslagama koje su poznate kao osnovnivodonosni kompleks, dok su danas u vodosnabdevanju manje zastupljene vode izizdani u pliocenskim sedimentima i prve, slobodne izdani rasprostranjene plitko ispodpovršine terena.Pored snabdevanja stanovništva, veliki potrošači podzemne vode su i industrijskapreduzeća, a zbog loših uslova i nerazvijenih sistema za navodnjavanje sve veći korisnicivoda prve izdani postaju i poljoprivredni proizvođači.Geološka ...
    resursi podzemnih voda, vodosnabdevanje, održivo upravljanje, osnovni vodonosni kompleks, termomineralne vode, monitoring podzemnih
    ... hidrogena zemljišta, stvorena pod dejstvom oscilacija podzemnih voda, odnosno kao posledica uzlaznog i silaznog kretanja soli. Slani zemljišni pokrov sadrži koncentrat soli do zasićenja. 6.3. Tektonika terena Proučavanjem tektonskih karakteristika ovog dela Panonskog basena bavio se veliki ...
    ... materije poreklom iz šećerana, klanca i industrija mesa, stočnih farmi. Pored ovih, nalaze se i druge različite vrste zagađujućih materija: neorganske soli, kiseline i baze, organske materije, suspendovane materije, boje, toksične materije, mikroorganizme, radioaktivne materije, tople vode i dr. ...
    ... resursima podzemnih voda severne Bačke MANAGEMENT OF GROUNDWATER RESOURCES OF NORTHERN BAČKA Abstract Groundwater reservoirs are the sole resource for community water supplies in northern Bačka. Groundwater from Pleistocene water-bearing strata, or the principal composite Pleistocene ...

  • Evidence of Variscan and Alpine tectonics in the structural and thermochronological record of the central Serbo-Macedonian Massif (south-eastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Richard Spikings, Andreas Wetzel (2016)
    General Earth and Planetary Sciences
    ... concerns both Variscan and Alpine tectonics in the SMM, the names of the tectonic units discussed below only refer to the later (i.e. Alpine) tectonics so that results presented here could be correlated with the previously published tec- tonic frameworks of south-eastern Europe. The Supragetic nappe ...
    ... covite schists in the northern part of Vlasina Unit (22%757.756”E, 42%3/43.306"N). Size of the head of hammer 136 mm. c Fan- ning axial-plane cleavage So in the chlorite schists in the northern part of Vlasina Unit (22%18/15.775”E, 42%48'!21.52”N). Size of pen 152 mm. d Initial foliation S; folded in ...
    ... 9JEp UPouT pojuStoAi u SI 9Bp OUn) poseo|oj IV e % OS< ueds jeu} sdojs Suneou snonSmuoo g< 'o'! *neoje|d „J *SoloS SO{OA, UIO)JSESI SA/7 *opuo{quiou /q// *93nOTq Jg *931AOOSsnur 57JA/ :(O1(C) SUPAH pue /AoujruAA O} BUIpIO00P po}PIAOIqqe SOUIDU ...

  • Age of the Jurassic hemipelagic sediments from the Ljubiš area (Zlatibor Mt., SW Serbia)

    Nikita Bragin, Nevenka Đerić (2020)
    Radiolaria, Dinarides, Jurassic, stratigraphy, Serbia
    ... Formation above our samples contains reworked Middle Jurassic Bositra limestone clasts (GAWLICK et al., 2017), known mainly from the Bajocian- Bathonian, so these radiolarites should be younger than the re­ worked clasts. Anyway, the deposition of the Ljubiš Formation could have started earlier than previously ...

  • Arsenic in Tap Water of Serbia´s South Pannonian Basin and Arsenic Risk Assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    kvalitet podzemnih voda, arsen, analiza rizika, Panonski Basen
    ... in groundwater of the test area sug- gests a reducing medium that creates favorable conditions for arsenic migration in groundwater. Due to the low solu- bility of iron oxides, hydroxides, and carbonates in ground- water, their concentrations in groundwater were found to be rather low. The iron concentration ...

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... and coke – Determination of man- ganese oxide (Mn3O4) in ash from fuels. SRPS B.H8.368 (1973): Methods of analysis of coal and coke – Determination of so- dium and potassium oxide (Na2O2 and K2O) in ash from solid fuels. SRPS B.H8.369 (1973): Methods of analysis of coal and coke – Determination of sulfur ...

  • Wordnet Development Using a Multifunctional Tool

    Ivan Obradović, Ranka Stanković (2007)
    In this paper we present a multifunctional tool for manipulating heterogeneous language resources. The tool handles electronic dictionaries, wordnets and aligned texts, and provides for their synchronous use in various tasks. We focus here on the description of the possibilities this tool offers in the development of wordnets. Besides the wordnet module which enables parallel handling of two wordnets, other modules, such as the module for morphological dictionaries and the module for aligned texts, as well as available finite ...
    Wordnet development, language resource integration, HLT tools
    ... checks on wordnets. For example, when word senses are in question, WS4LR provides information of the senses that have already been used for a word, so the user can assign a sense tag that has not previously been assigned, thus preventing duplicate word-sense pairs. The wordnet module can also ...

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... availability and affordability are merged with acceptability and accessibility, as four main dimensions of energy security, also known as the four As. So called, the four As has become well known throughout the scientific literature in the field of energy. Many studies have conceptualized energy security ...

  • Development and Evaluation of Three Named Entity Recognition Systems for Serbian - The Case of Personal Names

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2019)
    In this paper we present a rule- and lexicon-based system for the recognition of Named Entities (NE) in Serbian news paper texts that was used to prepare a gold standard annotated with personal names. It was further used to prepare training sets for four different levels of annota tion, which were further used to train two Named Entity Recognition (NER) sys tems: Stanford and spaCy. All obtained models, together with a rule- and lexicon based system were evaluated on ...
    NER, Named Entity Recognition Systems, Serbian, Personal Names
    ... uments. It is designed for structured annotation, allowing embedded annotations, which are espe- cially convenient for NER. Annotations are ex- ternal, so for each text file, an additional annota- tion file contains annotation data described in Sec- tion 4. CoNLL02 is a two-column format, also described ...

  • 2D geoelectrical resistivity tomography application at the former city waste dump "Ada Huja": Eco-geological problem

    Branislav Sretenović, Filip Arnaut, Ivana Vasiljević, Vesna Cvetkov (2019)
    2D inversion, geoelectrical method, Wenner array, ecology, Ada Huja
    ... Belgrade locality but can be used with some reserves, organic waste boasts a maximum of household waste with 43%, but that waste is biodegradable so it is not accounted for in the “Ada Huja” case. This is also true for paper and paper- 72 Sretenović B., Arnaut F., Vasiljević I., Cvetkov V. ...

  • Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)

    Ivana Jelić, Aleksandar Pačevski, Aleksandar Kremenović, Aleš Šoster, Andreja Šestan, Janez Zavašnik (2023)
    The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer ...
    Inorganic Chemistry, Condensed Matter Physics,General Materials Science, General Chemical Engineering, crystal structure, FeAsS, oxidation, TEM, XRPD
    ... Arsenopyrite can incorporate significant amounts of metal ions, such as gold, cobalt, and nickel, either accommodated in the crystal structure in a solid so- lution or as micro-inclusions [2,3]. In particular, the ability of the Au incorporation renders arsenopyrite an economically relevant ore mineral ...

  • Integrative GHG Assessment in Oil and Gas Industry

    Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa (2023)
    Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...
    energetska tranzicija, gasovi staklene baste, industrija, nafta i gas
    ... developing and implementing. effective abatemcnt strategies for gas utilization, such as rcinjection or conversion to powecr 58 generation. By doing so, companies can reduce their GHG emissions and minimize thcir environmental impact, while also benefiting from incrcased energy efficicncy and cost ...

  • Stratigraphic implications of the Mio-Pliocene geodynamics in the area of Mt. Avala: new evidence from Torlak Hill and Beli Potok (Belgrade, Serbia)

    Ljupko Rundić, Meri Ganić, Slobodan Knežević, Dejan Radivojević, Miloš Radonjić (2019)
    Mt. Avala is located on the southern margin of the Pannonian basin (SPB), a border zone between the uplifted morphostructures of the Dinarides and Carpathian-Balkanides. Similar to the Pannonian basin, tectonostratigraphic evolution of the Mt. Avala area during the last 23 Ma has is characterized by syn- and post-rifting processes as well as tectonic inversion. Here, we present the results of field investigations of the Miocene‒Pliocene dynamics that led to different spatial positions of the same stratigraphic units (e.g. ...
    мио-плиоценска геодинамика, јужни Панонски басен, Авалски и Торлак хорст, Белопоточки трог, Србија
    ... Geological Society 1. INTRODUCTION Since the early pioneering work of e.g. ROYDEN et al. (1983) and HORVÁTH (1984), the following thirty years or so have seen publication of a lot of papers concerning the origin and evolution of the Pannonian Basin (PB) and its marginal parts e.g. TARI & PAMIĆ ...
    ... movements of the faults separating the lo- cal blocks. In the previous studies (e.g. LASKAREV, 1931) the existence of a large linear structure, the so-called the Rakovica fault was noticed which locally separates the Torlak horst from the trough, which STEVANOVIĆ (1951) distinguishes as the Beli ...

  • Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics

    Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić (2024)
    Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated in the south of Serbia and occupying an area of 700 km2. This volcanic complex is composed predominantly of andesites, with sporadic occurrences of andesite-basalts, dacites and latites, and features agate formations that have been very little investigated. This study focuses on five selected agate occurrences within the Lece Volcanic Complex, employing optical microscopy, scanning electron microscopy (SEM), X-ray powder diffraction analysis, inductively coupled plasma mass spectrometry ...
    Lecki vulkanski kompleks, andeyit, kalcedon, kvarc, opal-CT, mikrostruktura, organska materija

  • Application of geophysical and multispectral imagery data for predictive mapping of a complex geo-tectonic unit: a case study of the East Vardar Ophiolite Zone, North-Macedonia

    Filip Arnaut, Dragana Đurić, Uroš Đurić, Mileva Samardžić-Petrović, Igor Peshevski (2024)
    General Earth and Planetary Sciences
    ... Geographical position of study area (red poly- gon) within North Macedonia; (c) The geographical position of North Macedonia Elevation (m) BB so- 250 [ 250 - 5oo [Z soo - 750 [___] 750 - 1000 [___] tooo - 1250 [ 1250 - 1500 [O 500 - 1750 BIB - 50 D Testing area [___] Training area ...
    ... higher likelihood of predicting the ophiolite class in comparison to the RF models, with the former being approximately three times more likely to do so. Specifically, the maximum probability of ophiolite class prediction for the RF models is approximately 2.9%, while that for the KNN models is ...

  • Избор методе подземног откопавања на примеру лежишта бакра

    Mилош Глигорић (2024)
    Тема овог завршног рада је избор методе откопавања у подземном руднику бакра. Рад је подељен на четири поглавља. У првом поглављу дат је приказ општих података и геолошких карактеристика ширег подручја и лежишта. Детаљан опис отварања и припреме лежишта за откопавање представљен је у другом поглављу. У трећем поглављу дат је опис све три варијанте изабране методе за запуњавањем откопаног простора, са освртом на количину захваћене руде, трошковима експлоатације као и динамиком откопавања. Четврто поглавље представља нумерички пример где ...
    избор методе подземног откопавања, анализа ефективности, лежиште бакра, подземна експлоатација
    ... KpHTepHjyMa KOJH TECOKC MHHHMYyMy (COSt KpHTepHJyMuH). IIpeMa ToMe, onmrHMajmHa ajJrepHaTHBa CeČ ojnpebyje Ha curenehH HauHH: S={sy,S>,...,SkX}U{Sy,So, .-.,S;k +1=j (4.3.7) Kopak 5. JleKonoaunuja i – re anrrepHaTHBe Kao mrro Jje omicaHo y Kopaky 4, neKoMnoauruija i — Te axnrrepHaTHBC BPIHH ce ...
    ... ODyHKuuja onrTHMajmHe H i — Te ax_1TepHaTHBC 49 O0nacr Hcnojt orruMajme anrepHaTHBe pauyHa ce Ha carenehu HauuiH: 1 1 F = | f"*(sSodx = |(65 – Sex + So)dx = 0 0 Sı – Sk +Sy - (4..16) O0nacr Hcnojri i – Te arrepHaTHBe pauyHa ce Ha carenehui HauHH: 1 1 Fi = | fi(T,Tu)dx = | ((T. — Tyy)x + Ta)d ...

  • Utvrđivanje Bondovog radnog indeksa Pb-Cu-Zn rude rudnika Rudnik

    Jovana Jović (2024)
    Završni rad sa temom ,,Utvrđivanje Bondovog radnog indeksa Pb-Cu-Zn rude rudnika Rudnik” sastoji se iz opšteg i specijalnog dela. OPŠTI DEO sadrži: U opštem delu dato je: Uvod, Geografski položaj i istorijski razvoj rudnika "Rudnik", kratak prikaz geologije ležišta i eksploatacije rude kao i opis tehnološkog procesa flotacije rudnika “Rudnik”. SPECIJALNI DEO sadrži:U specijalnom delu dato je:Cilj istraživanja, teorijske osnove usitnjavanja, Bondov radni indeks, metode ispitivanja uzoraka, uzorkovanje i obrada uzorka; Metode ispitivanja; Rezultati ispitivanja po standardnom Bondovom postupku i po ...
    Bondov radni indeks, standardni postupak, skraćeni postupak, ruda olova, bakra i cinka, rudnik „Rudnik“
    ... sirovine: Ep = K · (s — so),[kWh/t] gde je: Ep - specifična potrošnja energije, [kWh/t], Kpa — konstanta proporcionalnosti, koja predstavlja energiju potrebnu za stvaranje 1m? nove površine, [krWh/m?], s- specifična površina sirovine nakon usitnjavanja, [m?/t], so — Specifična površina sirovine ...

  • Sorpcija herbicida na neorganski i organski modifikovanom prirodnom montmorionitu iz Bogovine

    Lazar M. Kaluđerović (2018-01-17)
    fikasnost prilikom sorpcije S-metolahlora i klomazona od strane neorganskih iorganski modifikovanih montmorionita sa lokaliteta Bogovina odreĎena je metodombach adsorpcije. Uzorci montmorionita su tretirani prvo rastvorom NaCl a zatim irazličitim koncentracijama organskih kompleksa. Adsorpcione izoterme su dobijenetretiranjem uzoraka različitim koncentracijama herbicida. Detaljna mineraloškakarakterizacija uzoraka uraĎena je metodom rendgenske difrakcije. Rezultati interakcijemontmorionita sa organskim kompleksima i herbicidima dobijeni su primenomrendgenskih, optičkih, termičkih i spektroskopskih metoda.Na osnovu rezultata rendgenskih ispitivanja uzoraka, utvrĎeno je prisustvoorganskih kompleksa i herbicida u meĎuslojnom prostoru montmorionita.Montmorioniti modifikovani ...
    adsorpcija, montmorionit, heksadeciltrimetilamonijum bromid,feniltrimetilamonijum hlorid, S-metolahlor, klomazon
    ... u hidrofobnu su takoĎe ispitivani (Jordan, 1949). Organofilni bentoniti su pripremani reakcijom bentonita sa različitim alifatičnim amonijumovim solima. Ustanovljeno je da stepen zasićenja moţe da zavisi od: 1) stepena prekrivenosti površine organskim katjonima 2) stepena zasićenja kapaciteta katjonske ...
    ... nekoliko metoda neorganskih modifikacija sa katjonima poput Ca2+, Na+, Li+, NH4 +, itd. Modifikacija u Na-montmorinit moguća je upotrebom različitih Na soli (Na2CO3, NaOH, Na3PO4, NaF) (Zhang et al., 2011), ali najčeša je upotreba 1M rastvora NaCl (Nasser et al., 1997; Tomić et al., 2012; Tomić et al. ...

  • Optimizacija dužine strele rotornih bagera u funkciji stabilnosti kosina i efektivnosti rada na površinskim kopovima lignita Srbije

    Branko M. Petrović (2016-07-12)
    Rotorni bageri su mašine koje se u današnje vreme najviše primenjuju uprocesu masovne eksploatacije uglja zahvaljujući, pre svega, nizu tehničkoeksploatacionihprednosti u odnosu na druge vrste bagera. Raznovrsnirudarsko-tehnički zahtevi otkopavanja doprineli su razvoju nekoliko tipova ovihmašina, tako da svaki od njih ima svoje prednosti i nedostatke u odnosu nadrugi tip.Predmet istraživanja u disertaciji odnosi se na izbor optimalnekonstrukcije strele bagera i njene usaglašenosti sa uslovima radne sredine kojiće vladati na površinskim kopovima lignita Srbije, imajući u vidu složene usloveeksploatacije (velika ...
    površinski kop, parametri bloka, kapacitet, rotorni bager, strelabagera, geomehanika, stabilnost kosina, ekonomija
    ... over other types of excavators. A variety of mining and technical mining requirements contributed to development of several types of these machines, so that each of them has its advantages and disadvantages compared to other type. The subject of the thesis relates to the selection of the optimal ...
    ... i bolje kapacitetno iskorišćenje bagera. Tehnološki parametri odreska (Slika 3.18.) su: h - visina odreska koja odgovara visini reza (m); So - debljina odreska koja je u funkciji ugla okretanja strele bagera u odnosu na podužnu osu bagera (ϕ) i ugla rezanja (ρ) (m); b - širina odreska ...
    ... okretanja strele bagera u odnosu na podužnu osu bagera (ϕ). b S0 h r Slika 3.18. - Tehnološki parametri odreska Debljina odreska (So) koja je jednaka debljini reza, se ostvaruje pomeranjem bagera na početku ulaska u novi rez, odnosno, kada je strela rotora u krajnjim položajima ...