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Упит dcterms_subject_txt:method of least squares

2831 items

  • Hydrochemical features and their controlling factors in the Kucaj-Beljanica Massif, Serbia

    Fen Huang, Ljiljana Vasic, Xia Wu, Jianhua Cao, Saša Milanovic (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... — API Method — Wave Equation API method This method was developed in 1956 at the Research Institute of the city of Kansas in the USA by manufacturers and users of deep well pump equipment. It is more precise than the empirical method, with the main difference being that the API method takes ...
    ... system. If the production of fluid relies solely on the natural energy of the reservoir, this method of exploitation is called an eruptive method. When the reservoir energy is sufficiently depleted, so that the reservoir pressure is no longer enough to enable the flow of fluid through the well, ...
    ... this method for fluid extraction. The purpose of this paper is to introduce the basic components of the pump, its operation, and improvements to its performance through the application of a double-acting valve. The first part of the paper presents the underground and surface equipment of the rod ...

  • Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material

    Borislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić (2022)
    Pyrophyllite, with the chemical formula Al2Si4O10(OH)2, is a naturally occurring and abundant van der Waals mineral belonging to the group of phyllosilicates. It is very soft, layered crystal used for sculpting and an excellent electrical and thermal insulator aimed for the operation at high pressure and temperature. Here, for the first time, two-dimensional (2D) pyrophyllite obtained by both mechanical and liquid phase exfoliation is presented and investigated at the nanoscale. The layered structure provides low friction coefficient of around ...
    Atomic force microscopy, Insulating properties, Nanofriction and wear, Natural two dimensional materials, Phyllosilicates, Pyrophyllite

  • Strain partitioning in a large intracontinental strike-slip system accommodating backarc-convex orocline formation: The Circum-Moesian Fault System of the Carpatho-Balkanides

    Nemanja Krstekanić, Liviu Matenco, Uroš Stojadinović, Ernst Willingshofer, Marinko Toljić, Daan Tamminga (2022)
    oroklini, raspodela deformacija, transkurentna kretanja, Karpato-balkanidi, Cirkum-mezijski rasedni sistem
    ... 4) offsets the Danubian basement to the NW from its Mesozoic sedimentary cover to the SE and has at least two major strands (S1, Fig. 4). The main strand is outcrop- ping along the NW bank of the Danube, exposing a high-density dextral strike-slip zone (Fig. 5a) or decametre-scale fault surfaces visible ...
    ... (Tithonian limestones) to the east from the Timok zone of the Getic unit (Turonian clastics) to the west. These Tithonian limestones are intensely deformed (Fig. 5d) by sub-vertical N-S oriented dextral strike-slip faults grouped in at least 3 closely spaced main strands that display decametre-scale ...
    ... Maţenco, 2017, Krstekanić et al., 2020, following the terminology of Schmid et al., 2020 and the results of this study). Red polygon is the location of Fig. 4, blue polygon marks the location of Figs. 6 and 8. Dark green lines show positions of cross-sections in Fig. 3. BaB – Babušnica Basin; BoB – Bozovici ...

  • 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

  • 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
    ... systems. With a suffi- cient amount of mannitol (at least 30%), the cake structure is secured by its crystallinity even if primary drying is carried out at -10 "C, while amorphous sucrose could provide stabilization of the nanocrystals (Johnson et al., 2002). The cake collapse observed in the S+M ...
    ... particle measurement method after one month of storage. Measurements were performed using a Mastersizer (Malvern Mastersizer 2000 equipped with a small volume dispersion cell, Mal- vern, UK). Results are reported as d(0.1), d(0.5), and d(0.9), repre- senting 10%, 50%, and 90% of the particle volume ...
    ... Department of Pharmaceutical Technology and Cosmetology, University of Belgrade-Faculty of Pharmacy, Vojvode Stepe 450, Belgrade 11221, Serbia ” Department of Pharmaceutical Technology, University of Ljubljana, Faculty of Pharmacy, Aškerčeva 7, 1000, Ljubljana, Slovenia of Nuclear Sciences ...

  • Српски језик у дигиталном добу -- The Serbian Language in the Digital Age

    Duško Vitas, Ljubomir Popović, Cvetana Krstev, Ivan Obradović, Gordana Pavlović-Lažetić, Mladen Stanojević (2012)
    Serbian language
    ... inflection, formal syncretism of certain gram- matically different word forms is not uncommon. As a consequence of inflection, for a dictionary of 120,000 lemmas, at least 4.5million inflected grammatical forms exist (however, there are fewer surface forms, as some forms in certain paradigms are identical) ...
    ... Pullet Surprise. Journal of Irreproducible Results, page 13 (Fist Verse), 1994. [36] Zoran Urošević. Statistička metoda otkrivanja i korekcije slonih grešaka supstitucionog tipa u tekstu na srp- skohrvatskom jeziku (Statistical method for detection and correction of typos of substitutional type in a ...
    ... e introduction of lan- guage technologies in Serbia follows at least three dif- ferent directions: (a) through state supported scien- tific and technology development projects (b) through (mainly) foreign companies which, in addition to com- puter equipment, also offer some sort of language sup- port ...

  • Back-arc underplating provided crustal accretion affecting topography and sedimentation in the Adria microplate

    Paolo Mancinelli, Vittorio Scisciani, Cristina Pauselli, Gérard M. Stampfli, Fabio Speranza, Ivana Vasiljević (2021)
    Supported by evidence of deep crustal sources for the observed magnetic anomalies in Central Italy and by outcropping gabbros in the Croatian archipelago, we model the observed gravity and magnetic anomalies in the Central Adriatic Sea and surroundings. We suggest that the major magnetic anomalies in the area are related to a wide underplating and propose that this volume represents the first stage of the back-arc Adria continental breakup in Early Permian times. During the Palaeotethys-Adria collision, underplating has ...
    Underplating, akrecija kore, Magnetske anomalije, Jadranska ploča

  • Prostorni položaj ofiolita istočne Vardarske zone: geofizičko-geološki model i njegove geodinamičke implikacije

    Dragana D. Petrović (2015-12-29)
    Centralni deo Balkanskog poluostrva je geotektonski veoma složen. Tetis je zatvorentokom gornjeg mezozoika, a ofioliti na zapadu i ofioliti Vardarske zone predstavljajuostatke nekadašnjih okeanskih prostora. Najistočniji deo Vardarske zone razlikuje se odsvih ostalih ofiolita na Balkanskom poluostrvu i karakteriše se najizraženijim suprasubdukcijskimafinitetom. Istočna vardarska zona locirana je u centralom delu Srbije.Na severu se prostire do Apusena u Rumuniji, a na jugu obuhvata cetralni deoMakedonije i Peonias zonu u severnoj Grčkoj. Istočna vardarska zona se nalazi istočnood geotektonske jedinice Kopaonik ...
    Istočna vardarska zona; ofioliti; 2D i pseudo 3D geofizičko-geološkimodel; geodinamička evolucija
    ... 2005. Age and origin of granitic rocks of the eastern Vardar Zone, Greece: new constraints on the evolution of the Internal Hellenides, Journal of the Geological Society, London 162, 857-870, doi: 10.1144/0016-764904-077. Baranov, V., 1957. A new method for interpretation of aeromagnetic maps: ...
    ... ast. Pseudo 3D models indicate that at least part of the East Vardar ophiolites is settled below the Serbo-Macedonian Massif. The border between these two geotectonic units is very steep near the surface, however, with increasing of depth the dip angle of this contact decreases. Obtained geophysical– ...
    ... Triassic- Jurassic evolution of the Triassic-Jurassic evolution of the Neo-Tethys in Dinaride sector, Lithos, 227-242, doi: 10.1016/j.lithos.2010.10.009. Salem, A., Williams, S., Fairhead, J. D., Ravat, D., Smith, R., 2007. Tilt-depth method: A simple depth estimation method using first-order magne ...

  • 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

  • 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

  • Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)

    Nevenka Novaković, Predrag Dabić, Vesna Matović (2023)
    Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...
    Raspadanje, Indeks oštećenja, Zatrpavanje, Fizička svojstva, Kersantit

  • 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 ...
    Carbon Capture, Utilization and Storage
    ... include a range of —10.5 to +10.5 USS/t CO- stored for European sites. Cost estimates show that CO»-enhanced gas recovery can provide a benefit of 4-16 USS/t COx, depending on the price of gas and the effectiveness of recovery [61]. Figure 4.5 shows an enhanced oil recovery method used to store CO» ...
    ... for the synthesis of ammonia and chlorine. The hydrate-forming method is another technique that is used for desalination, and it involves the formation of hydrates by using CO2 to separate the salts from water [16]. A challenge with the desalination process is the waste of brine solids in huge ...
    ... established separation method that results in high capture efficiency however the energy cost incurred is very high mainly because of the high energy requirements for the solvent regeneration option[37]. Operational limitations such as corrosion and a large volume of water makeup represent ...

  • Еоценска фауна југозападног дела Сирт басена (Либија)

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

  • Минерагенија зеолитских туфова Србије

    Vladan Kašić (2018-02-05)
    Лежишта наших зеолитских туфова (Златокоп, Игрош, Јабланица 1, Беочин, Топоница и Сланци) која су овде била предмет детаљних истраживања, просторно и генетски везана су за вулканске и вулканокластичне стене маринских средина сенонске и неогенске старости и језерске седименте неогене старости и настала су као продукт девитрификације вулканског стакла.Током лабораторијских испитивања при изради ове докторске дисертације, примењене су следеће аналитичке методе: оптичка испитивања петрографских препарата; рендгенска дифракција праха (XRD); скенирајућа електронска микроскопија (СЕМ метода); хемијска карактеризација зеолитских туфова у оквиру ...
    минерагенија, зеолитски туф, Србија, клиноптилолит, хојландит
    ... Garvey R. (1986): LSUCRIPC - Least Squares Unit Cell Renfinment with Indexing on the Personal Computer -MS(PC)-DOS, Department of Chemistry, North Dakota State University Gvozdić D., Stojić V., Šamanc H., Fratrić N., Daković A., (2008): Apparent efficiency of immunoglobulin absorption in newborn ...
    ... Minato H. and Utada M., (1969):Zeolite in the clays of Japan-International Clay Conference, Tokio, Japan Geol. Survey, 121-134. Ming D. W., Dixon J. B., (1987): Quantitative determination of clinoptilolite in solis by cation-exchange capacity method. Clays and Clay Minerals, 35, 6, 463-468. Ming ...
    ... MINERAGENY OF ZEOLITIC TUFFS OF SERBIA Summary Our zeolite tuff deposits (Zlatokop, Igroš, Jablanica 1, Beočin, Toponica and Slanci), which were the subject of detaild research, spatially and genetically are connected to volcanic volcaniclastic rocks of marine environment of Senonian and ...

  • Mapping and classifying large deformation from digital imagery: application to analogue models of lithosphere deformation

    Taco Broerse, Nemanja Krstekanić, Cor Kasbergen, Ernst Willingshofer (2021)
    kontinentalna tektonika: kompresija, kontinentalna tektonika: ekstenzija, kontinentalna tektonika: transkurentni i transformni rasedi, pukotine, rasedi, zone snažnih deformacija, kinematika deformacija kore i omotača, teorijska mehanika, modelovanje
    ... Computation of the deformation gradient In eq. (1) we have discussed the coordinates of points of which we have tracked the change in coordinates x. For the following, we define quadrilateral elements (that in our implementation starts as squares in the undeformed state) and we apply the computation of F to ...
    ... strains. Thereby, our method introduces a physically meaningful classification of large 2-D strains. We show that our strain type classification method allows for accurate mapping of tectonic structures in analogue models of lithospheric deformation, and complements visual inspection of fault geometries ...
    ... imagery (PIV), makes it possible to study deformation of a small piece of material in an environment that is subject to large translations, rotations or shape changes. Compared to the method of Boutelier et al. (2019) we improve the determination of the displacement gradient by using a bilinear interpolation ...

  • Razvoj integralnog modela za optimizaciju diskontinualnog sistema proizvodnje na površinskim kopovima nemetala

    Miodrag Čelebić (2024)
    Izbor optimalne mehanizacije u diskontinualnom sistemu transporta je jedna od najvažnijih odluka koju treba donijeti prilikom projektovanja površinskih kopova. Pri izboru optimalne mehanizacije, uticaj ima veliki broj faktora, kako prirodnih – geoloških i ekoloških, tako i tehničkih, ekonomskih i socijanih. Neki od njih se mogu izraziti numerički, u određenim mijernim jedinicama, a neki opisno, lingvističkim varijablama, shodno uslovima koji vladaju na rudnim ležištima, a koje karakterišu visok stepen neizvjesnosti i neodređenosti kako prilikom istraživanja, tako i tokom procesa eksploatacije ...
    izbor mehanizacije, tehnologija eksploatacije, diskontinualani sistem, ekspertsko odlučivanje, lingvističke varijable, MCDM, FAHP

  • Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia

    Nikola Burazer, Aleksandra Šajnović, Nebojša Vasić, Milica Kašanin-Grubin, Dragana Životić, João Graciano Mendonça Filho, Predrag Vulić, Branimir Jovančićević (2020)
    Stratigraphy,Economic Geology,Geology,Geophysics,Oceanography

  • Integrated Stratigraphy of the Middle–Upper Jurassic of the Krížna Nappe, Tatra Mountains

    Renata Jach, Nevenka Đerić, Špela Goričan, Daniela Reháková (2014)
    carbon and oxygen isotopes, radiolarians, calcareous dinoflagellates, radiolarites, Krížna Nappe, West ern Carpathians, Tethys
    ... y. The calcium carbonate content of 376 rock samples was estimated by means of a calcimetre by Eijkelkamp, which Works in accordance with the method of Schcibler. The ana- lysis of CaCOy3 content was conducted at the Institute of Geo- logical Sciences of the Jagiellonian University in Krakow ...
    ... the name of Gladkie Upla- zianskie (Fig. 1; Table 1). The section is 34 m thick (Fig. 6). The succession studied starts with grecn radiolarites (0.3 m) which pass into variegated radiolarites, with common massive red and dark grey chert nodules (17 m), red radiola- rites (at least 2 m) and ...
    ... 15. Summary of correlation of the Bajocian-Early Tithonian &IŠC curves from the Križna Unit of the Tatra Mountains. mainly because of insufficicnt biostratigraphic data. In the interval 84–95 m of the lower part of the grey nodular lime- stones, the Š IŠC values reach a minimum of about 1.1% ...

  • Upravljanje proizvodnjom nafte – novi alat na bazi fazi logike

    Мирослав Црногорац, Душан Даниловић, Лола Томић (2020)
    ... security of so many others [6]. Groundwater reportedly provides drinking water to at least 50% of the global population and accounts for 43% of all water used for irrigation [7]. Groundwater also sustains baseflows of rivers and important aquatic ecosystems. Uncertainty over the availability of groundwater ...
    ... lift method. In order to achieve optimal production, the selection of the artificial lift method have an important role. Optimal selection method achieves the economical production. By introducing new tools developed on the basis of artificial intelligence, decision making in the management of oil ...
    ... firm and stable foam, which should be kept on the surface for at least three minutes. This paper analyzes the physicochemical and sensory characteristics of beer foam as well as the structure of foam in different types of beer. Keywords: beer, stability, structure, quality UVOD Znak dobrog kvaliteta ...