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Упит dcterms_subject_txt:crystal structure

445 items

  • Fuzzy Model for Risk Assessment of Machinery Failures

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...
    fazi teorija, rizik, otkaz rudarskih mašina
    ... toward the consequences and negative effects that can manifest after a failure. The consequences of a failure can have a negative impact on the structure of machines, employees, and the environment. The negative impact of an individual component failure can be reflected in reduced operational capacity ...
    ... as toward the consequences and negative effects that can manifest after a failure. The consequences of a failure can have a negative impact on the structure of machines, employees, and the environment. The negative impact of an individual component failure can be reflected in reduced operational capacity ...
    ... failures. We developed an algorithm for the implementation of risk effects, that is, the probability of a negative occurrence that impacts the structure of a machine, the production process in which it participates, the work environment, or the environment in general due to an unexpected shutdown ...

  • Late and post-collisional tectonic evolution of the Adria-Europe suture in the Vardar Zone

    Emő Márton, Marinko Toljić, Vesna Cvetkov (2022)
    The Vardar Zone is a product of the Triassic-Jurassic opening of the Neotethys, Jurassic obduction, Late Cretaceous/Paleogene consumption of the oceanic crust and continental collision. During the last process, the Eastern Vardar Zone was thrust over the Central and eventually both onto the Western Vardar Zone. The present paleomagnetic and structural study provided new results from the first two zones in the Belgrade area. The younger set of data, together with published ones from the third zone, provide firm ...
    Adria–Europe suture, Vardar Zone, Paleomagnetism, Thrusting, Vertical axis rotation

  • Синтеза, структурне и магнетне особине Ca1-xGdxMnO3 нанопрахова

    Milena Rosić (2014-12-05)
    У оквиру ове докторске тезе, испитиване су оптималне методе за добијањенанопраха – калцијум манганског оксида допираног јонима гадолинијума. Циљистраживања је испитивање одговарајућих прекурсора који су подесни да седобију чисти нано прахови манганита са перовскитском структуром, као имонофазни чврсти раствори са перовскитском структуром. Као подесан методкоришћена је модификована глицин нитратна метода, а од прекурсора нитрати иацетати одговарајућих метала. Модификација глицин нитратне методе се односина делимичну замену нитрата ацетатима, чиме је ублажена бурност реакције.Испитан је различити однос прекурсора, који дају наночестичне ...
    Наноструктурни материјали, Оксиди, Термална анализа,Рендгенструктурна анализа, Магнетна мерења.
    ... Tehnološko-metalurški fakultet, Beograd. Thomas, N. W. (1989): Crystal Structure-Physical Property Relationships in Perovskites. Acta Cryst. B45, 337-344. Töpfer, J., Pippardt, U., Voigt, I., Kriegel, R. (2004): Structure, nonstoichiometry and magnetic properties of the perovskites Sr1−xCaxMnO3−δ ...
    ... штампана у изводу (M64) 1. Rosić, M., Matović, B., Babić, B., Egelja, A., Devečerski, A., Radosavljević – Mihajlović, А. (2009): Synthesis and crystal structure of Ca(1-x)GdxMnO3, VIII Student's Meeteing, Processing and Application of Ceramics, December 2-5, Novi Sad, Serbia, Book of Abstracts, p.46 ...
    ... Livage, J. (2000): Metal Oxide Chemistry and Synthesis: From Solution to Solid State, Wiley, New York Jona, F., Shirane, G. (1993): Ferroelectric crystal, Dover Publications, INC., New York Jortner J., Rao C.N.R. (2002): Nanostructured advanced materials. Per- spectives and directions, Pure and ...

  • Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles

    Aleksandar M. Mijatović, Ratomir M. Jelić, Jovana Bogojeski, Živadin D. Bugarčić, Biljana Petrović (2013)
    Kinetika i mehanizam reakcija supstitucije između [Ru(trpi)(bpi)Cl]+ sa nukleofilima gvanozin-5′-monofosfatom, L-histidinom, tioureom i dimetilsulfoksidom proučavani su spektrofotometrijski u 0,1 M NaClO4 na 310 K. Red reaktivnosti za odabrane ligande je: tiourea > gvanozin-5′-monofosfat > L-histidin > DMSO. Ovaj red je povezan sa elektronskim, strukturnim i hemijskim karakteristikama kompleksa i nukleofila. Reakcija supstitucije sa tioureom je proučavana na tri različite temperature (288, 298 i 310 K). Negativna entropija aktivacije DS = potvrđuje asocijativni način aktivacije. Formiranje kompleksa [Ru(trpi)(bpi)H2O]2+ sa ligandima ...
    Kinetika, Ravnoteža, Ru(II), L-Histidin, Guanozin-5' -monofosfat, Dimetilsulfoksid, Tiourea
    ... metastasis growth [27]. Today, many different ruthenium complexes have been synthesized and investigated to elucidate the relationship between the structure of inert ligands and properties of the complexes. Complexes with polypyridyl ligands [9, 28–30] and organometallic half sandwich ligands [31–37] ...
    ... than thiourea. Taking into account the size of the molecule, we expected that 50-GMP reacts very slowly. But, besides nitrogen donor atoms in the structure of the purine base and the well-known coordination to metal ions via N7 atoms, this nucleotide could be bound to Ru(II) via phosphate oxygen atoms ...
    ... stable than complexes with L-His. Taking into account the volumi- nosity of 50-GMP and L-His as well as the bulkiness of inert ligands in the structure of [Ru(trpy)(bpy)H2O] 2?, it can be concluded that here intramolecular hydrogen bonds play a significant role for the stability of products. In ...

  • Multi-word Expressions for Abusive Speech Detection in Serbian

    Ranka Stanković, Jelena Mitrović, Danka Jokić, Cvetana Krstev (2020)
    Ovaj rad predstavlja istraživanja na usavršavanju i unapređenju srpske verzije rečnika Hurtlex, višejezičnog leksikona uvredljivih reči. Posebnu pažnju posvećujemo dodavanju izraza sa više reči (polileksemskih jedinica) koji se mogu smatrati uvredljivim, jer su takvi leksički zapisi veoma važni za postizanje dobrih rezultata u mnoštvu zadataka otkrivanja uvredljivog jezika. Srpski morfološki rečnici se koriste kao osnova za čišćenje podataka i stvaranje rečnika. Istaknuta je veza sa drugim leksičkim i semantičkim resursima na srpskom jeziku i predviđena je izgradnja sistema za ...
    uvredljiv govor, govor mržnje, leksički izvori, višejezični leksikon, izrazi sa više reči
    ... relevant entries, both already existing and new, with markers appropriate for its detection. In the first step, we analysed the mopho-syntactic structure of MWEs marked as positively or poten- tially abusive (markers MAYBE or YES). This list, originally having 1772 items, contained after separat- ing ...
    ... of POS tags to MWEs does not define the POS, or the role, an MWE itself does. For instance, pukla bruka ‘scandal burst’ has a common verbal phrase structure V N; however, it is a frozen expression mostly used as an interjection. As already mentioned, prior to this task SrpMD contained 79 multi-word entries ...
    ... 2020). We have started to apply the similar approach to verbal expressions. Among the group of verbal expressions the most frequent are those with a structure V N (289), followed by V PREP N (124), V PRO N (52), V N PREP N (40). Again, this is a rough analysis because each group may contain syn- tactically ...

  • 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
    ... Tokyo in 2009 a study was published, in which the nine moods were analysed in text using complex finite automata that recognizes the grammatical structure of the text (Neviarouskaya et. al., 2009). That same year, researchers at Stanford University in California unveiled the new web posts analysis system ...
    ... text_value, and then, each whitespace in the document is replaced with string. Character _ becomes whitesapce again and document structure becomes: ... ... . The second part of tokenization is performed using four additional ...
    ... XSL function. Figure 9. The appearance of a document fragment before and after tokenization. – Fourth transformation does not contribute to the structure of the docu- ment, but only the speed of its processing. Name of each element token is shortened to t, and each attribute value to v, which greatly ...

  • Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention

    Milica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović (2023)
    Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...
    Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol Injection

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost
    ... followed by Norian and Rhaetian dolomites (Hrvatović, 2006). �e Late Triassic dolomites and the Early Jurassic lithi- otid limestones within the same structure (Natević and Petrović, 1970; Vujisić, 1975) constitute the exposed base- ment of the Adriatic Carbonate Platform, similar to oth- er localities in ...
    ... followed by Norian and Rhaetian dolomites (Hrvatovi¢, 2006). The Late Triassic dolomites and the Early Jurassic lithi- otid limestones within the same structure (Natevic and Petrovic, 1970; Vujisi¢, 1975) constitute the exposed base- ment of the Adriatic Carbonate Platform, similar to oth- er localities in ...
    ... Stankiewicz, A., 2011. Basic petroleum geochemistry for source rock evaluation. Oil�eld Review, 23: 32–43. Miljuš, P., 1971. Geological and tectonic structure and history of development of external Dinarides and Adriatic. Unpublished PhD �esis, Faculty of Mining and Geology, University of Belgrade, ...

  • A Tool for Enhanced Search of Multilingual Digital Libraries of E-journals

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Aleksandra Trtovac, Miloš Utvić (2012)
    This paper outlines the main features of Bibliša, a tool that offers various possibilities of enhancing queries submitted to large collections of TMX documents generated from aligned parallel articles residing in multilingual digital libraries of e-journals. The queries initiated by a simple or multiword keyword, in Serbian or English, can be expanded by Bibliša, both semantically and morphologically, using different supporting monolingual and multilingual resources, such as wordnets and electronic dictionaries. The tool operates within a complex system composed ...
    multilingual digital libraries, query expansion, TMX
    ... collections of data. This term generally refers to heterogeneous (different in format, standard and size, etc.) data, of a potentially variable structure, the content of which can grow exponentially. Manipulation of such data, which in general encompass documents, metadata content, user-generated ...
    ... precision. Moreover, for multi-word units not found in dictionaries, there exists a rule-based strategy, which attempts to recognize syntactic structure of the multi-word and how it should be inflected [Stankovic et al., 2011]. Another type of resources used by Bibliša for bilingual and semantic ...

  • Using Query Expansion for Cross-Lingual Mathematical Terminology Extraction

    Velislava Stoykova, Ranka Stanković (2018)

  • 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

  • Application of ERT in the study of debris-flow source area: Case study Selanac debris flow

    Dragana Đurić, Jelka Krušić, Biljana Abolmasov (2021)

  • Early–Middle Jurassic brachiopods from Ponor Mountain, Western Balkan Mountains, Bulgaria; taxonomy, biostratigraphy and occurrence in the context of the early Toarcian Oceanic Anoxic Event

    Barbara V. Radulović, Lubomir S. Metodiev, Neda Motchurova-Dekova, Platon Tchoumatchenco (2023)
    Brachiopods, taxonomy, biostratigraphy, early Toarcian Anoxic Event, Bulgaria

  • Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach

    Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2021)
    Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome these problems, the selection of the appropriate formulation technology needs to be based on the physicochemical properties of the drug and introduced in the early stages of drug research. One example of the new potential drug substance with poor solubility is DK-I-60-3, deuterated pyrazoloquinolinone, designed for the treatment of various neuropsychiatric ...
    pyrazoloquinolinones, nanocrystals, wet media milling, fasted/fed bioavailability
    ... Developed formulations had small uniform particle sizes and were stable for three months. Nanonization caused decreased crystallite size and induced crystal defects formation, as well as a DK-I-60-3 solubility increase. Furthermore, after oral administration of the developed formulations in rats, two to ...
    ... stable for three months. Nanonization caused decreased Publisher’ : MDPI 1 oo . . vgs ublisher’s Note: MDPI stays neutra crystallite size and induced crystal defects formation, as well as a DK-I-60-3 solubility increase. with regard to jurisdictional claims in oe : : : 8 } Furthermore, after oral administration ...
    ... the results were collected was from 3◦ to 40◦, with the step of 0.01◦ (data collection speed was 3 ◦/min). To minimize the low background, a single crystal silicon sample holder was used. The XRPD data were treated by the PDXL2 integrated X-ray powder diffraction software (v. 2.8.30; Rigaku Corporation ...

  • Curcumin nanonization using an alternative small-scale production unit: selection of proper stabilizer applying basic physicochemical consideration and biological activity assessment of nanocrystals

    Ines Nikolić, Jelena Antić-Stanković, Dragana Božić, Danijela Ranđelović, Bojan Marković, Dominique Jasmin Lunter, Aleksandar Kremenović, Miroslav Savić, Snežana Savić (2020)
    As the number of poorly soluble drugs is increasing, nanocrystals have become very interesting due to wide range of application possibilities. Curcumin was used as a model active ingredient in this work. Even though it has many proven positive effects, due to its physicochemical issues, its possibilities have not been fully exploited. The goal of this work was to select optimal conditions for a top-down method for curcumin nanosuspension production, and to perform their comprehensive characterization applying complementary methodologies: ...
    nanocrystal, curcumin, top-down method, wetball milling

  • 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

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

  • Projecting short to medium-term effects of carbon emissions trading on Serbia's GDP

    Boban Pavlović, Nikola Trtica (2024)
    This paper presents an approach to assess the short to medium-term effects of the Emissions Trading System (ETS), an economic and climate policy instrument aimed at reducing greenhouse gas emissions, on GDP from the expenditure side. The analysis focuses on Serbia’s electricity sector, which relies heavily on lignite-based pro duction dominated by state-owned enterprises. The obtained projections suggest that in the short term, the introduction of an ETS may lead to slower GDP growth compared to official forecasts. However, ...
    ETS, BDP - rashodni pristup, cene električne energije
    ... about 29%, with most coming from hydroelectric power plants (approximately 26%). The structure of electricity production and amounts of electricity produced in 2022 are shown in Table 1, while the structure of electricity production from energy sources in the 2013-2022 period is shown in Fig ...
    ... 20% 0% 2013 | 2014 | 2015 | 2016 2017 | 2018 2019 2020 2021 | 2022 MCoal #Naturalgas and fueloil m Hydro mWind wSolar mBiogas Fig. 3. The structure of electricity production by energy sources in Serbia (%) (2013—2022) (Statistical Office of the Republic of Serbia, 2023). Recommendation of ...
    ... Serbia, the dynamic changes between the analyzed years arise from the fact that household consumption accounts for 70% of Serbia's total GDP structure (Statistical Office of the Republic of Serbia, 2024a). This proportion is significantly higher than in some more developed economies (OECD, ...

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

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... methods aim to reproduce in situ variability, and the spatial continuity of the input data set. Models used in this way, aim to replicate the spatial structure of a data set as a whole rather than provide reli- able local estimates of an attribute at particular locations. The stochastic simulated model ...
    ... multiple equally probable realizations derived from a lognormally simulated sulfur distribution. Models used in this way, aim to replicate the spatial structure of a data set as a whole rather than provide reliable local estimates of an attribute at particular locations. The stocking model From operational ...
    ... multiple equally probable realizations derived from a lognormally simulated sulfur distribution. Models used in this way, aim to replicate the spatial structure of a data set as a whole rather than provide reliable local estimates of an attribute at particular locations. The stocking model From operational ...

  • Determination of the groundwater-leakage mechanism (binary mixing) in a karstic dam site using thermometry and isotope approach (HPP Visegrad, Bosnia, and Herzegovina)

    Ljiljana Vasić, Saša Milanović, Anita Puskás-Preszner, Laszlo Palcsu (2020)
    Earth-Surface Processes,Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change