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Упит dcterms_subject_txt:crystal structure

445 items

  • Polyhedral characteristics of the cosalite-type crystal structures

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović, Aleksandar Pačevski, Ljiljana Karanović, Marko V. Rodić, Martina Tribus (2019)
    kristalna struktura, kozalit, poliedarske karakteristike

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic

  • Data from the Digital Repository of the Faculty of Mining and Geology in eScience (eNauka)

    Biljana Rujević, Mihailo Škorić (2024)
    The paper describes linking the Digital Repository of the University of Belgrade, Faculty of Mining and Geology, with the eScience system in terms of transferring metadata about the results of researchers' scientific work. The steps taken to ensure a smooth harvesting of metadata are outlined. Additionally, a presentation of additional improvements to the OAI system is provided, aiming to contribute to the automatic linking of authors with their results in the eScience system.
    репозиторијуми, еНаука, метаподаци, Рударско-геолошки факултет

  • 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
    ... could not be detected by XRPD due to its low concentration and low intensity of diffraction peaks when it is in nanocrystalline form. The crystal structure of DK-I-56-1 in nano- crystalline formulation was confirmed in Mitrović et al. (2020), and would probably not change during lyophilization ...
    ... corresponding to the stretch vibration of the two crystal water molecules in the dihydrate, disappeared in the spectra of the freeze-dried samples, similarly as in Jakubowska et al. (2022) (Fig. 7b). In addition, the peak associated with the crystal water in the trehalose dihydrate at 1680 cm ! ...
    ... 1D standard mode with a CuKou „ radiation source (U=40 kV and I=30 mA). Data were acquired in a 20 range of 3-40% using a low background single crystal silicon sample holder to minimize background. Results were analyzed using PDXL2 (v. 2.8.30) integrated X-ray powder diffraction software. 2.7 ...

  • Agent-based modeling as a support to an expert-based approach: Exploring individual heating systems transition

    Boban Pavlović, Marija Živković, Dejan Ivezić (2022)
    Expert-based energy scenarios are mainly developed following assumptions of experts and, in most cases, a limited number of stakeholders. Such an approach will provide satisfactory results in centrally managed energy sectors where further decisions could be envisaged relatively precisely (electricity production/distribution, district heating systems, etc.). The same approach will provide more uncertain outcomes of future energy structure in the household sector, where decisions related to consumption, selection of energy source, or application of specific technology are made by numerous ...
    Energetska tranzicija, Grejanje domaćinstava, Individualni sistemi grejanja, Energetsko planiranje, Integrisano energetsko planiranje, ABM, LEAP, Srbija

  • An intelligent hybrid system for surface coal mine safety analysis

    Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić (2010)

  • Coupling of artificial intelligence methods in the development of hybrid intelligent systems

    Ranka Stanković, Ivan Obradović, Nikola Lilić (2001)
    In this paper we present an approach which couples various artificial intelligence (AI) methods in the solution of complex problems that cannot adequately be solved by a single AI method. We argue that the resulting, hybrid intelligent systems (HIS) can be successfully implemented with the use of available AI software libraries. Different coupling methods are analyzed and a classification of hybrid systems based on the chosen method is given. Two case studies of hybrid systems used in mining engineering ...
    hibridni inteligentni sistemi, spregnuti sistemi, metode veštačke inteligencije, rudarske primene veštačke inteligencije
    ... flow process modelling using CFD Data acquisition ventilation and psychrometric parameters ventilation and psychrometric parameters Fig. 2 Structure of the hybrid system for mine ventilation planing and analysis INVENTS consists of three program modules: a software package for aerodynamic definition ...
    ... ventilation systems. SimVent is a software package that enables mine ventilation simulation in underground exploitation of ore deposits. The global structure of the mathematical model for ventilation simulation in mine ventilation networks, transformed into the SimVent software package is composed of ...
    ... The module for the analysis of gas distribution in the ventilation system. In view of the complexity of the INVENTS system’s global model data structure, which had to model all relevant parameters of complex mine ventilation networks, the design and realization of database was executed in the MSAccess ...

  • The influence of Al<sup>3+</sup>ion on porcine pepsin activity<i>in vitro</i>

    Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić (2008)
    The in vitro effect of Al3þ ions in the concentration range 1.7·1026M–8.7·1023M on pepsin activity at pH 2, via kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated the existence of an activation effect of Al3þ at pH 2 on pepsin molecule. Kinetic analysis with respect to concentrations of haemoglobin showed that Al3þ ions increase the maximal velocity (Vmax) and kcat values rather than apparent affinity for substrate (KS) implying the non-competitive nature of activation which indicated ...
    Пепсин, алуминијум, кинетика, активација, електрофоретска мобилност
    ... D, Tang J. Primary structure of porcine pepsin. III. Amino acid sequence of a cyanogens bromide fragment, CB2A, and the complete structure of porcine pepsin. J Biol Chem 1975;250:5082—5088. 7] Sielecki AR, Fedorov AA, Boodho A, Andreeva A, James MNG. Molecular and crystal structures of monoclinic ...
    ... 29 30 31 32 33 P+ 1009 Zlctivation of bepsin by 4P" in vitro ... structure of the hexagonal crystal form of porcine pepsin at 2.3A resolution. J Mol Biol 1990;214:199—222. Wiodawer A, Erickson JW. Structure-based inhibitors of HIV- 1 protease. Ann Rev Biochem 1993;62:543—585. Dunn ...
    ... 1984;18:313—322. 3] Baldwin ET, Bhat TN, Gulnik S, Hosur MV, Sowder RC, Cachau RE, Collins J, Silva AM, Erickson JVXW. Crystal structures of native and inhibited forms of human cathepsin D: Implications for lysosomal targeting and drug design. Proc Nat Acad Sci USA 1993;90:6796—6800. 4] ...

  • A Description of Morphological Features of Serbian: a Revision using Feature System Declaration

    Cvetana Krstev, Ranka Stanković, Vitas Duško (2010)
    In this paper we discuss some well-known morphological descriptions used in various projects and applications (most notably MULTEXT-East and Unitex) and illustrate the encountered problems on Serbian. We have spotted four groups of problems: the lack of a value for an existing category, the lack of a category, the interdependence of values and categories lacking some description, and the lack of a support for some types of categories. At the same time, various descriptions often describe exactly the same ...
    Morphology, Lexicon, lexical database, Standards for LRs
    ... formulate relations between categories and their values as well as their applicability we have used feature structure constraints with conditional and bi-conditional tests. For instance, feature structure for nouns consists of nine features, five of which are present as attributes in MULTEXT-East: type, ...
    ... exactly the same morphological property using different approaches. We propose a new morphological description for Serbian following the feature structure representation defined by the ISO standard. In this description we try do incorporate all characteristics of Serbian that need to be specified for ...
    ... MULTEXT-East description; (4) and that would be reusable for present and future applications. Thus we have developed SprFSD following the feature structure representation defined by the ISO 24610 standard (ISO, 2007). As stated in (Lee & al., 2004) such representation enables specialists from diverse ...

  • Effects of Energy Production and Consumption on Air Pollution in Serbia

    Marija Živković (2019)
    Energy production and combustion, mostly from unregulated or inefficient fuel combustion, are the single most important anthropogenic sources of air pollutant emissions. Energy sector in Serbia is highly fossil fuel intensive: 87.88% of energy consumed in Serbia is related to fossil fuels, while almost 95% of energy sources are combusted. In 2017. energy related carbon dioxide emission in Serbia is was 47.95 million tones. The main source of carbon dioxide emission was coal, responsible for almost 70% of energy ...
    energy related emissions, Serbia
    ... total primary energy consumption for period 2007-2017 b) structure of total primary energy consumption in 2017 Coal is mainly used for electricity generation i.e. 88% of total coal energy is utilized in thermal power plants or CHPs. Structure of electricity generation by source is presented in Figure ...
    ... bases for determination of pollutants emissions. For the case of Serbia data can be found in energy balances of the country 7. The trend and the structure of primary energy consumption for the last ten years are given in Figure 2. In 2017 total primary energy supply was 667890 TJ 8. It can be characterized ...
    ... with average efficiency of 34.2% 8. Figure 3. Electricity generation by source Final energy consumption in Serbia in 2017 was 365047 TJ 8, with structure divided according to sectors and energy products presented in the Figures 4.1.a and 4.1.b. a) ...

  • Using English Baits to Catch Serbian Multi-Word Terminology

    Cvetana Krstev, Branislava Šandrih, Ranka Stanković (2018)
    In this paper we present the first results in bilingual terminology extraction. The hypothesis of our approach is that if for a source language domain terminology exists as well as a domain aligned corpus for a source and a target language, then it is possible to extract the terminology for a target language. Our approach relies on several resources and tools: aligned domain texts, domain terminology for a source language, a terminology extractor for a target language, and a ...
    aligned texts, word alignment, terminology extraction, electronic dictionaries, morphological inflection
    ... 4th are a structure 1–4 in a case that agrees with a preposition 10 AxN4x AxN4x The 1st component inflects and agrees with a structure 5. 3,160 3,082 11 AxN6x AxN6x 1st inflects and agrees with a structure 5–8 in gen/instr 1,263 1,252 12 N8x Nx(S4)g(i) 1st inflects; remaining 4 are structure 8, 9 in ...
    ... inflects and agrees with a structure 3. 2,662 2,480 7 AxAxN AxAxN All 3 components inflect and agree in gender, number and case 2,421 2,260 8 2xAxN 2xAxN 1st component does not inflect; 2nd and 3rd are structure 1 137 113 9 N6x Nx(S3)g(i) 1st inflects; 2nd, 3rd and 4th are a structure 5–8 in gen/instr 2,452 ...
    ... in gen/instr 1,135 1,113 NxPrep(S3)pc 1st inflects; last three are a structure 5–8 in a case that agrees with a preposition (S2)xPrep(S2)pc First two are structure 1-4; last two are a structure 1–4 in a case that agrees with a preposition Table 1: Term candidates per inflectional classes recognized ...

  • 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
    ... prolongation are dashed. Numbered structures in stereonets correspond to map-scale structures with the same number. Each structure may combine multiple observation points. S - structure; P - observation point; fault planes without a sense of shear are measured foliations within fault gouge; cf - density ...
    ... affected by strike-slip and thrust faulting in a large positive flower structure along the southern prolongation of the Timok Fault. l) WNW-ESE oriented dextral splay connecting two strands of the Timok Fault in the positive flower structure of the Jerma gorge at studied point P36. (For interpretation of the ...
    ... Fault (Fig. 5k) are connected and change their orientation to NW-SE and ki- nematics to dextral transpressive to define a positive flower structure. The flower structure is associated with thrusts (Fig. 5k), connecting splays (Fig. 5l), conjugated sinistral faults and truncated, clockwise rotated, earlier ...

  • Production information system of the Pljevlja coal mine

    Božo Kolonja, Ranka Stanković, Filip Vuković (2018)

  • Kristalografsko proučavanje strukturne desimetrizacije granata grosularsko-andraditske izomorfne serije

    Pavle I. Tančić (2016-09-21)
    U ovoj Doktorskoj disertaciji proučavano je pet različitih zona makroskopski zonarnog grandita sa lokaliteta Meka Presedla (Kopaonik, Srbija). Pomoću hemijske i elektronske analize mikroprobe preračunati su relativno visoko homogeni sastavi zona, t.j.: Grs64±1Adr36±1Sps2 (A), Grs62±1Adr38±1Sps2 (B), Grs59±2Adr40±2Sps2 (C), Grs58±2Adr41±2Sps2 (D) i Grs58±1Adr41±1Sps2 (E). Glavne promene u sastavima izražene formulom: Ca2,93-2,97Mn0,05-0,06Mg0,00-0,01Al1,14-1,26Fe3+0,72-0,83Ti0,00-0,02Si2,97-3,02O12 ukazuju da je jedina značajnija varijacija ustanovljena samo kod Al-Fe3+ raspodela u oktaedarskom položaju. Ovakav hemijski sastav je potvrđen i sa matematičkim proračunima iz IC i Raman analiza. Urađena ...
    Macroscopically zoned grandite, chemical analysis, electron microprobe analysis, Raman, Rietveld, structure, dissymmetrization, space group

  • Understanding partitioning of deformation in highly arcuate orogenic systems: Inferences from the evolution of the Serbian Carpathians

    Nemanja Krstekanić, Liviu Matenco, Marinko Toljić, Oleg Mandić, Uroš Stojadinović, Ernst Willingshofer (2020)
    orogeneza, oroklini, višesmerna ekstenzija, transkurentna kretanja, Srpski Karpati
    ... 3, 4, 5 in Fig. 5) which changes to NW-SE and top to NE in the southern part (e.g., structure 9 in Fig. 5), although some local variability is recognized at farther distances from the Supragetic thrust (structure 8 in Fig. 5). These two different orientations of thrusts are not observed in the same ...
    ... g., structure 3 in Fig. 5 and Fig. 6a). This shearing is sub-parallel with the dominantly W-dipping foliation of the Supragetic metamorphics. Often decimeters thick shear zones are observed affecting the Mesozoic limestones located in the immediate footwall of the Supragetic thrust (structure 5 in ...
    ... shear-zones that have a dominant NE direction of tectonic transport (structure 9 in Fig. 5 and Fig. 6c) and are associated with NE-SW oriented strike-slip faults, cross-cut at map scale by subsequent strike-slip deformation (structure 10 in Fig. 5). The sense of shear along closely spaced thrusts truncating ...

  • Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae

    Hans Peter Nytoft, Geir Kildahl-Andersen, Sofie Lindström, Frode Rise, Achim Bechtel, Danica Mitrović, Nataša Đoković, Dragana Životić, Ksenija A. Stojanović (2019)
    Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMRspectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10?20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270?146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant ...
    Geochemistry and Petrology

  • A Fuzzy Expert Model for Availability Evaluation

    Dejan Ivezić, Miloš Tanasijević, Predrag Jovančić, Radiša Đurić (2019)
    Each technical system within itself carries the great potential danger of possible occurrence of failure and damages. Mining machines are characteristic by great investment values, costs of unplanned shutdowns, complex working conditions, and environment and workers hazards. Systematic monitoring of the mining machinery is of great importance for the management of the mining companies. Availability is the overall concept of quality of service. Includes information regard to operating state, an idle state, a standby state and shut down. The ...
    raspoloživost, ekspertski sistem, fazi teorija, buldozeri
    ... availability can be calculated by the time coefficient, which includes mention time state. For time state tracking, specific IT structure is necessary. Such structure is often very expensive and unavailable. An alternative is the expert system, which can absorb partial indicators of the availability ...
    ... [5,6]. However, this definition does not provide complete information about availability. The obtained result does not provide the availability structure. Delays caused by completing paperwork, waiting for manpower, tools, test equipment or waiting for spares have an influence on machine availability ...
    ... for every j (5) The assessment of engineering system finally is obtained in the form: A = (MAXj=1, …, MAXj=5) = (μA1, …, μA5) (6) The structure of the described max-min composition is presented in Fig. 3. D a ta f o rm Data collection: Reliability, Maintainability, Supportability ...

  • An Approach to Management Decision Support: The Coal Mine Pljevlja Management Information System

    Božo Kolonja, Ranka Stanković, Filip Vuković, Ivan Obradović (2006)
    In this paper we describe the approach that has been used in the development of the Management Information System (MIS) in the Coal Mine Pljevlja in Montenegro. The methodology of this approach was based on new information technologies and management techniques which have already been successfully applied in other related fields. Its main goal was to introduce modern management techniques to mining, adapted to specific features of the mining industry, its operations and environment, thus enabling the tactical management ...
    ... purpose of easier management of data on equipment, a catalogue of equipment components has been made, containing prototypes of the hierarchical structure of equipment. Namely, component trees according to the types of equipment represent prototypes of the equipment with all their integral parts. All ...
    ... of equipment cannot function without previously realized system for technical database management, which defines all maintenance subjects, their structure and requests for preventive maintenance according to the equipment manufacturer’s recommendations or on basis of personal experience. Also, it ...
    ... the managers of the company in a clear and synoptic way. It is necessary that all the operative business segments of interest for the managerial structure of the company be electronically supported, so that summary information can be automatically provided. A production balance is made at the end ...

  • Tracking of the temporal dependency of fading of the human footprint temperature contrast

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Darko Vasiljević, Danica Pavlović (2021)
    In certain situations, it is extremely important to determine the exact time “someone” entered or crossed the forbidden zone of a military or strategic installation, a red zone of radioactive, chemical, or biological contamination, a bank or similar structure. Standard security measures include ordinary video surveillance using cameras that operate in the visible range of the electromagnetic spectrum, as well commercial thermal imaging cameras [1, 2]. The paper presents the results of experiments that suggest another possible use of ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... hierarchal structure. The general schematic display of the AHP method structure is shown in Figure 2. The goal (zero level) of the AHP method structure is at the very top. After the goal, level 1 containing the criteria, after which come the sub-criteria. The last level of the structure (level 2) contains ...
    ...      (1) Figure 2. The schematic display of the structure of the analytical hierarchy process (AHP) method. The mathematical basis of the AHP method consists of four steps: 1. Production of a hierarchical model, that is, the structure of the decision-making problem (presented in Figure 2); ...
    ... afterwards combined into the total priority alternatives; 4. Checking the consistency of the decision-maker. Figure 2. The schematic display of the structure of the analytical hierarchy process (AHP) method. The initial assumption in this work is that the simplest and the most correct decisions are made ...