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Упит dcterms_subject_txt:Gas Hydrate Formation

343 items

  • Structural dissymmetrization of optically anisotropic Grs64±1Adr36±1Sps2 grandite from Meka Presedla (Kopaonik Mt., Serbia)

    Pavle Tančić, Aleksandar Kremenović, Predrag Vulić (2019)
    In this paper, grandite core with Grs64±1Adr36±1Sps2composition was crystallographically studied. This core represents zone A of the macroscopically visiblefive A–E zones of the optically anisotropic Grs58–64 Adr36–42Sps2 grandite. The applied procedure includes the detailed analysis of the powder diffraction patterns, and the Rietveld refinements of the crystal structures in a series of 18 space groups and two mixtures, which were followed by the comparative analysis of the R-values, site occupancy factors, and the bond lengths and angles. Synthesis of all ...
    grandite, XRPD, crystal structure, structural dissymmetrization

  • 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

  • Uticaj proširenja nuklearne elektrane “Pakš” (Mađarska) na resurse podzemnih voda u Vojvodini

    Bojan Hajdin, Dušan Polomčić (2016)
    ... impact of the future nuclear complex's functioning on groundwater resources in Vojvodina, based on experience in the area of groundwater reserve formation in the region of the Pannonian Basin, its utilization and protection. Furthermore, an impact assessment has been given, relative to the strategic ...

  • 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

  • Flotability of chalcopyrite from the Rudnik deposit

    Đurica Nikšić, Predrag Lazić, Milena Kostović (2021)
    Директно селективно флотирање олова, бакра и цинка у флотацији рудника „Рудник” датира од 1984. године. Технолошка шема омогућава директно издвајање селективних концентрата у три циклуса. У првом циклусу се издваја минерал олова (галенит), док су минерал бакра (халкопирит) и минерал цинка (марматит) депримирани. У другом циклусу се оток концентрације минерала олова кондиционира и припрема за издвајање минерала бакра. Након кондиционирања, у овом циклусу се издваја минерал бакра. У трећем циклусу се оток концентрације минерала бакра кондиционира и припрема за ...
    Директно селективно флотирање, халкопирит, KAX, NaCN

  • Linear-motor plunger pump increases lifting efficiency

    Bojan Martinović, Dušan Đekić, Dušan Danilović, Pavel Isaev (2022)
    plunger, linear, motor, pumps

  • 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
    ... (umbrella) term, which contains the following phenomena: reliability (R), maintainability (M), supportability (S) [19]. The first step in the formation of the synthesis model is the availability proposition and its partial indicators (R, M, S). Five linguistic variables are introduced for each indicator ...
    ... inadequate training, logistical support, etc. It is not possible to plan activities in the context of time and organization. The second step in the formation of the synthesis model is the composition of partial parameters to the synthesis level. Basically, the composition in the fuzzy theory is represented ...

  • Stratigraphy and Microfauna (Radiolarians and Foraminifera) of the Upper Cretaceous (Upper Santonian–Lower Campanian) Carbonate Deposits in the Area of Struganik Village, Western Serbia)

    Liubov Bragina, Nikita Bragin, Luidmila Kopaevich, Nevenka Đerić, Nataša Gerzina Spajić (2020)
    Santonian, Campanian, radiolarians, planktonic foraminifera, biostratigraphy, limestones, Struganik, Serbia

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... period when a new generation of hydrogeologists grew up under umbrella of the newly formed Cathedra for Hydrogeology. A special contribution to the formation and development of special disciplines made by prof. Budimir Filipović, Who, as a mentor, directed the development of our hydrogeological school ...
    ... conference ever organized in our country regarding the management of groundwater Tesources. MI the mentioned facts are an introduction to the formation of the Centre for Karst Hydrogeology (CKH). The formal occasion is related to the return of Dr Petar Milanović from one of his numerous visits to ...
    ... Science and Education, No. 176022, "Fvaluation of the Impact of Climate Change on Water Resources in Serbia", Min. science and education, no. 37005, Formation of a new extended network of groundwater monitoring in Serbia and "Operational groundwater monitoring in the Republic of Serbia", Ministry of ...

  • Mehanizam nastanka bjelasičke klipe u internim Dinaridima severne Crne Gore

    Katarina Stefanović (2024)
    Bjelasička klipa predstavlja segment Internih Dinarida na području severne Crne Gore. Područje obuhvata tektonski kontakt Drinsko-ivanjičke jedinice i Istočnobosansko-durmitorske jedinice, pri čemu se na širem području nalaze i jedinice Prekarst i Zona bosanskog fliša. Tektonska klipa Drinsko-ivanjičke jedinice, odnosno bjelasička klipa, kao i generalna tektonska evolucija područja u kom se ona nalazi, nisu izučeni u adekvatnoj meri. Stoga je cilj ovog rada pribavljanje novih podataka o tektonskoj evoluciji bjelasičke klipe, koji mogu biti značajan prilog za bolje poznavanje geodinamičke ...
    Interni Dinaridi, paleonaponska analiza, bi-direkciona ekstenzija, rased Skadar-Peć, dekstralno smicanje
    ... the United States, Elsevier, str. 327-344. Grund, M.U., Handy, M.R., Giese, J., Gemignani, L., Pleuger, J., Onuzi, K., 2023. Faulting, basin formation and orogenic arcuation at the Dinaric-Hellenic junction (northern Albania and Kosovo).mfermational Journal of Earth Sciences, 112: 1613—1634, ...
    ... E., Toljić, M., Tamminga, D., 2022. Strain partitioning in a large intracontinental strike-slip system accommodating backarc-convex orocline formation: the Circum- 65 Moesian Fault System of the Carpatho-Balkanides. Globa! and Planetary Change, 208: 103714, 1-23. Oszczypko, N., Oszczypko-Clowes ...
    ... fault-slip analysis. Tectonophysics, 482: 29—41. Stefanović, K., Krstekanić, N., 2024. Bi-directional extensional control of the Berane basin formation, northern Montenegro. Geološki anali balkanskog poluostrva OnLine-First Issue 00, str. 1-12. Stojadinović, U., Matenco, L., Andriessen, P.A.M ...

  • Savremeni pristup rešavanja problema industrijskog otpada

    Mariја Bošković (2024)
    Rad ukazuje na savremene metode rešavanja problema industrijskog otpada, sa posebnim fokusom na pećnu prašinu koja nastaje tokom metalurških procesa, poput proizvodnje čelika u elektrolučnim pećima. U radu se detaljno razmatra hemijski sastav pećne prašine, koja sadrži teške metale poput cinka, olova i kadmijuma, i naglašavaju ekološki izazovi koje predstavlja njeno zbrinjavanje. Takođe, analiziraju se metode tretmana i valorizacije pećne prašine, uključujući pirometalurške i hidrometalurške procese, pri čemu je poseban akcenat stavljen na reciklažu cinka iz pećne prašine. Dalje, ...
    prašina, elektrolučna peć, cink, teški metali, reciklaža
    ... 17) [7]. jet drops film drops \ Ć B • 0 e e K_ o 0 O liquid bubble cap o O N i \ o o o - KOA liquid gaS bubble a) bubble emerging b) rupture of the liquid film c) formation of a liquid jet and at the liquid surface Jet droplets Slika 17. Tri koraka koji dovode do formiranja dva tipa ...
    ... naslage postanu prevelike, potreban je veći pritisak za prolaz gasa kroz filter, što smanjuje protok gasa i efikasnost filtracije. U tom slučaju, filter vreće se čiste komprimovanim vazduhom pod podpritiskom. Primarni i sekundarni dimni gasovi vode se do postrojenja za otprašivanje putem cevovoda, gde ...
    ... prilikom punjenja peći, uklanjanja šljake i izlivanja čelika. Danas se koriste tri metode za prečišćavanje gasova iz peći (slika 3.) [5]. a) b) = c) Slika 3. Šematski prikaz odvođenja gasova i prašine iz elektrolučne peći [5] U slučaju koji je prikazan pod (a), kroz četvrti otvor na svodu peći tokom ...

  • Генеза хидротермалног Cu-Au система Чукару Пеки (Источна Србија)

    Милош Велојић (2021)
    Главни циљ испитивања хидротермалног система Чукару Пеки је разумевање процеса који су довели до његовог настанка, а посебно еволуције рудоносних флуида из којих је настала рудна минерализација. Утврђено је да је овај систем настао у периоду пре 86,78 - 85,19 Ma из магматског интрузива који је био богат водом и имао висок оксидативни потенцијал. Током хлађења, из овог магматског интрузива су издвојени веома врели флуиди, који су имали температуре изнад 600°С и висок салинитет. У ...
    Борска металогенетска зона, Тимочки магматски комплекс, порфирска лежишта, високосулфидациона лежишта, флуидне инклузије, рудне парагенезе, геохронологија, хидротермалне алтерације, LA-ICP-MS
    ... Abstract: The main goal of thе reseаrch conducted on the hydrothermal system of Čukaru Peki is the understanding of processses which led to its formation, with an emphasis on the evolution of hydrothermal fluids which led to the deposition of mineralization. This research indicates that the hydrothermal ...
    ... of magma led to the separation of very hot fluids which had temperatures above 600°С and high salinity. Two stages can be distinguished in the formation of this hydrothermal system: porphyry and epithermal stages. Characteristic ore minerals for the porphyry stage are chalcopyrite, magnetite, bornite ...
    ... in the Bor Metallogenetic Zone (BMZ, East Serbia). Minerals, 9(11), 672. 12. Berger, B.R. & Henley, R.W., 2011. Magmatic-vapor expansion and the formation of high- sulfidation gold deposits: Structural controls on hydrothermal alteration and ore mineralization. Ore Geology Reviews, 39(1-2), 75-90b ...

  • NMR kinetic studies of the interactions between [Ru(terpy)(bipy)(H2O)]2+ and some sulfur-donor ligands

    Aleksandar Mijatović, Biljana Šmit, Ana Rilak, Biljana Petrović, Dragan Čanović, Živadin D. Bugarčić (2012)
    Reakcije supstitucije monofunkcionalnog [Ru(terpi)(bipi)(H2O)]2+ kompleksa, gde je terpi = 2,2′:6′,2″-terpiridin i bipi = 2,2′-bipiridin, sa biološki relevantnim sumporo donorskim ligandima, kao što su tiourea, l-metionin, l-cistein i glutation, proučavane su u vodenim rastvorima tehnikom 1H i 13C NMR spektroskopije. Sve reakcije su proučavajne na pH 7,4, u prisustvu fosfatnog pufera, da bi se oponašalo fiziološko okruženje tokom procesa supstitucije. Reakcije se izvode na 295 K pod uslovima reakcija drugog reda. Uočeni rezultati pokazuju da brzina supstitucije snažno zavisi ...
    Materials Chemistry,Inorganic Chemistry,Physical and Theoretical Chemistry

  • Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization

    Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić (2016)

  • Environmental Energy Security Indicators as Tools for Environmental Protection

    Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević (2019)
    Еколошка прихватљивост је постала незаменљив синтезни показатељ сваке валидне енергетске анализе у последње две-три деценије. Енергетска безбедност је у директној хармонији с еколошком прихватљивошћу кроз многе прописане политичке циљеве, економске користи, правне тековине итд. Индикатори еколошке сигурности представљају један од основних елемената за одређивање енергетске безбедности и снажне алате за усмеравање енергетског сектора ка одрживом развоју. У овом раду, анализа је била концентрисана на показатеље енергетске безбедности у области животне средине који се односе на сектор природног гаса у ...
    енергетска безбедност, еколошки енергетски индикатори, заштита животне средине, еколошка прихватљивост
    ... Fuel-oil 0.6 Natural gas 0.1 Fire wood 3.2 3.2.3 Solid particles Combustion of fossil fuels, in addition to the emission of harmful gases, leads to the emission of particles. The particles further initiate the binding of other matter to the atmosphere, affecting the formation of smog in the ...
    ... 3.1 Partial indicator GHG emissions Greenhouse gas emissions are a universal environmental indicator that monitors all anthropogenic impacts that result in greenhouse gas emissions. Effective monitoring and reporting of greenhouse gas emissions is the basis for progress towards achieving ...
    ... t and natural gas consumption scenarios results in six possible projections for the future development of the natural gas sector in the Republic of Serbia by 2025. 7 4.2 Results and discussion The amount of CO2 emitted is directly related to projections of natural gas consumption. The ...

  • Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)

    Dušan Polomčić, Dragoljub Bajić, Jelena Zarić (2015)
    A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...
    Water supply, Aquifer, Flow, Groundwater regime, Numerical modeling, Particle tracking
    ... Based on the grain-size distribution of the water-bearing horizons, which also include the studied aquifer, the material of the water-bearing formation is represented by fine- and medium-grain sands (uniformity coefficient: Cu = d60/d10 = 2-3 mm with d50 = 0.1-0.3 mm, where d is particle/grain ...

  • Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering

    Josip Išek, Lazar Kaluđerović, Nikola Vuković, Maja Milošević, Ivana Vukašinović, Zorica Tomić (2020)
    γ-spectrometry, brushite, chukhrovite, phosphogypsum, radionuclides, recrystallization
    ... the Republic of Serbia through Project No. 176010 and Project No. 43007. References Amjad Z. (1988) Calcium sulfate dihydrate (gypsum) scale formation on heat exchanger surfaces: the influence of scale inhibitors. Journal of Colloid and Interface Science, 123(2), 523–536. Azimi G. (2010) Evaluating ...
    ... (temperature of 90%, no stirring) pro- moted such crystal growth. A similar result was obtained with calcium sulfate whiskers synthesized from flue gas desulfurization of gypsum using the atmospheric acidification method (Sun ef al., 2016). Whiteness index The WI of 52.5%, determined for raw p ...
    ... (in Portuguese). Sun H., Tan D., Peng T. & Liang Y. (2016) Preparation of calcium sulfate whis- ker by atmospheric acidification method from flue gas desulfurization gyp- sum. Procedia Environmental Sciences, 31, 621–626. Tian T., Yan Y., Hu Z., Xu Y., Chen Y. & Shi J. (2016) Utilization of original ...

  • Kontaktni metamorfizam gornjokrednih sedimentnih stena Rudnika

    Kostić N. Bojan (2021)
    Kontaktni metamorfizam gornjokrednih sedimentnih stena na planini Rudnik ispitivan je na uzorcima iz pet bušotina. Definisano je šest varijeteta krednih stena (protolita) koji čine dve litološke jedinice izgrađene od klastičnog, karbonatnog i klastično-karbonatnog materijala. Vulkanskom aktivnosti na Rudniku formirana su vulkanska tela koja se utiskuju duž slojevitosti sedimentnih stena, a neka ih presecaju u vidu dajkova. Starost ovog vulkanskog događaja određena je na 23.9 miliona godina. Ovaj miocenski vulkanizam doveo je do kontaktno metamorfnih promena sedimentnih stena i obrazovanja skarnova ...
    Rudnik, kontaktni metamorfizam, sedimentne stene, hornfels, skarn, granati, vezuvijan
    ... bedding planes in sedimentary rocks, or in a form of cutting dikes. Miocene volcanism resulted in contact metamorphism of sedimentary rocks and formation of skarn and hornfelses. Skarns are classified on epidote, garnet-vesuvianite and garnet-pyroxene skarns, while further division of hornfelses ...
    ... ts: garnet growth histories in retrograded rocks. Journal of Petrology 33, p.965-1005 Inui, M., Toriumi, M. 2004: A Theoretical Study on the Formation of Growth Zoning in Garnet Consuming Chlorite. Journal of Petrology 45 (7) p. 1369-1392 Ishii, T., Robinson, P. T., Maekawa, H., Fiske, R. 1992: ...
    ... Feng, Y., Nguyen, A., Zhao Z., Yang, W., Dong, Q., Zhao, J. 2019: LA-MC-ICP-MS U-Pb dating of low-U garnets reveals multiple episodes of skarn formation in the volcanic-hosted iron mineralization system, Awulale belt, Central Asia. The geological society of America Bulletin 132, p.1031-1045 Sigvaldason ...

  • Automatic construction of a morphological dictionary of multi-word units

    Cvetana Krstev, Ranka Stanković, Ivan Obradović, Duško Vitas, Miloš Utvić (2010)
    The development of a comprehensive morphological dictionary of multi-word units for Serbian is a very demanding task, due to the complexity of Serbian morphology. Manual production of such a dictionary proved to be extremely time-consuming. In this paper we present a procedure that automatically produces dictionary lemmas for a given list of multi-word units. To accomplish this task the procedure relies on data in e-dictionaries of Serbian simple words, which are already well developed. We also offer an evaluation ...
    electronic dictionary, Serbian, morphology, inflection, multiwordn units, noun phrases, query expansion
    ... DELAC entry is a very tedious task. As a matter of fact, we initially produced only 30 DELAC entries from scratch. Realizing that additional in- formation within DELAC entries (everything between the parenthesis) in most cases already exists in dictionaries of simple words (DELA) we decided to develop ...

  • Terminology Acquisition and Description Using Lexical Resources and Local Grammars

    Cvetana Krstev, Ranka Stanković, Ivan Obradović, Biljana Lazić (2015)
    Acquisition of new terminology from specific domains and its adequate description within terminological dictionaries is a complex task, especially for languages that are morphologically complex such as Serbian. In this paper we present an approach to solving this task semi-automatically on basis of lexical resources and local grammars developed for Serbian. Special attention is given to automatic inflectional class prediction for simple adjectives and nouns and the use of syntactic graphs for extraction of Multi-Word Unit (MWU) candidates for ...
    ... frequency: 1. AXN – an adjective followed by a noun; the adjective and the noun have to agree in all four grammatical categories; e.g. zemni gas ‘natural gas’. 2. 2XN – a noun preceded by a word that does not inflect in the MWU. Usually it is a word used only in one or a few MWUs, a prefix or an adverb ...
    ... checked 1) whether proposed lemmas were grammatically correct and 2) whether MWU terms belong to domain terminology, in this case library and in- formation science, or to the general lexica. For candidate ranking three measures were used: frequency, C-Value (Franzi et al., 2000) and log-likelihood ...