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Упит dcterms_subject_txt:grain size distribution

508 items

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

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... [6]. The main factors influencing blending efficiency are the pile size or its mass and the number of layers used to build pile. The aim in the homogenization process is to narrow down the standard deviation of the normal distribution. A measure of the quality of the homogenizing process is defined ...
    ... [6]. The main factors influencing blending efficiency are the pile size or its mass and the number of layers used to build pile. The aim in the homogenization process is to narrow down the standard deviation of the normal distribution. A measure of the quality of the homogenizing process is defined by ...
    ... homogenizing process; and from an operational point of wiew the problems tend to grow in difficultly as the size of the stockyard equipment involved increases. The adequate pile size is the minimum size which will deliver coal to the plant with grades varying within a pre-determined and acceptable grade ...

  • Microstructural and magnetic properties of electrospun hematite/cuprospinel composites

    Mira Ristić, Aleksandar Kremenović, Michael Reissner, Željka Petrović, Svetozar Musić (2020)
    Phase composition, microstructural and magnetic properties of electrospun hematite/cuprospinel composites were investigated. Samples were synthesized starting with 0 to 10 mol% of copper relative to iron. The round shape of reference electrospun fbres was preserved upon their heating up to 600 °C in air, whereas at 700 °C hollow substructure was additionally formed. In these reference samples the presence of hematite phase was detected by XRPD. A small amount (traces) of Fe3O4 /γ-Fe2O3 was also found, due to the ...
    Electrical and Electronic Engineering, Condensed Matter Physics, Atomic and Molecular Physics and Optics, Electronic, Optical and Magnetic Materials

  • State and perspective of individual household heating in Serbia: A survey-based study

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    This paper presents the results of the household survey on individual household heating systems in Serbia. The survey was conducted in the period October to December 2020 with the participation of 1100 households with individual household heating systems. The information collected in the questionnaire can be separated into three main parts: basic household data, current heating system characteristics, and households’ perceptions and attitudes. The survey results provide unique and comprehensive information concerning individual household heating systems and the main ...
    Domaćinstva, Individualni sistemi grejanja, Korišćenje energije, Stavovi potrošača, Anketa, Srbija

  • A tool for identifying the criticality in the disordered systems with metastable dynamics

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Stefan Graovac, Đorđe Spasojević (2021)
    Физика кондензоване материје

  • Critical disorder and critical magnetic field of the nonequilibrium athermal random-field Ising model in thin systems

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Đorđe Spasojević (2019)
    Изингов модел, критично понашање, танки системи

  • Quantitative landslide risk assessment in the city of Tuzla

    Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović (2021)
    In the climate-changing conditions, geological environment interacts more dramatically with the urban fabric than before. The urbanization is expansive and more aggressive than before, but so are the weather extremes and long-term climate trends. In effect, many processes which can be triggered by either side, nature or engineering, are becoming more pervasive than before, and such is the case with landslides. Dealing and managing landslides requires few crucial steps, starting from collecting data on landslide location and typology – ...
    "landslides", "risk assessment"
    ... 2014), remote sensing image analysis; using point or polygon for landslide representation, based on landslide size; filtering only appropriate, shallow landslides, of sufficient size for the final inventory. SCG-XIII INTERNATIONAL SYMPOSIUM ON LANDSLIDES. CARTAGENA, COLOMBIA- JUNE 15th-19th-2020 ...
    ... estimations on population distribution as possible. Eventually, overlapping spatial and temporal dimension of the process, as well as detailed element at risk inventory, resulted in a very detailed, very realistic landslide risk map. The map depicts realistic risk distribution over the populated areas ...
    ... ty model of the area. Figure 6. Annual rainfall distribution map of the area. Figure 7. Exposure vulnerability map of the area. Figure 8. Landslide risk map of the area. After obtaining the susceptibility classes distribution it was further possible to calculate weighted distance ...

  • 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
    ... performed immediately after freeze-drying and after one and three months of storage. 2.4. Particle size analysis Particle size (mean hydrodynamic radius, z-ave) and particle size distribution (polydispersity index, PDI) were measured by dynamic light scattering using the Zetasizer Nano ZS90 ...
    ... results (Table S3). Therefore, despite the initial increase in particle size, the nanocrystals remained in the nanometer range with a relatively narrow size distribution during storage. To facilitate comparison of particle size in different formulations, the redispersibility index was calculated ...
    ... < 0.001), despite good redispersibility immediately after lyophilization. The size of the particles doubled, decreasing the RDI to about 50% or less, with high PDI values indicating a broad particle size distribution. Massive agglomeration was confirmed by LD, where particles larger than 1 um ...

  • Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

    Maja Milošević, Predrag Dabić, Sabina Kovač, Lazar Kaluđerović, Mihovil Logar (2019)
    keramika, glina, Dobrodo, mineralogija, sirovina, Srbija

  • Characterization and Environmental Evaluation of Recycled Aggregates from Construction and Demolition Waste in Belgrade City Area (Serbia)

    Filip Abramović, Miroslav Popović, Vladimir Simić, Vesna Matović, Radmila Šerović (2024)
    General Materials Science

  • Lower Berriasian ammonites from Dedina (Golubac Mountains, eastern Serbia) and their biostratigraphic implication

    Zdenek Vasícek , Dragoman Rabrenović, Petr Skupien, Barbara Radulović (2023)
    Ammonites, Taxonomy, Lower Berriasian, Getic, Northern Tethys, Serbia
    ... evident in the Serbian specimen. A related species, also in terms of size, is Hypo- lissoceras subtilior (Zittel, 1870). It differs in dimensional parame- ters, especially in the greater width of the umbilicus. Distribution. This species is probably known only from the Stramberk Limestone from ...
    ... relations. Pseudosubplanites grandis differs from most species of the genus by the considerably larger size of adult spec- imens with adequate strength of the mostly forked ribs. Distribution. Pseudosubplanites grandis is recorded in the upper part ofthe lower Berriasian (former Grandis Subzone) ...
    ... there are 10—11 ribs at the umbilicus and 24 ribs sec- ondary plus intacalar ribs. Remarks. The small size and degree of preservation do not allow unambiguous species identification. Distribution. Malbosiceras asper is mainly known in France, Spain and Bulgaria. According to Nikolov (1982), it is ...

  • Correlation Between Dynamic CBR and Compaction and Bearing Capacity of Pavement Foundation Layers

    Milan Bogdanović, Snežana Bogdanović, Dragoslav Rakić, Irena Basarić Ikodinović (2024)
    This paper presents a dynamic California Bearing Ratio (CBRd) device that can be used on a prepared pavement foundation layer to obtain a certain parameter of the tested material in the laboratory and in situ in a direct and fast way. For the selected natural material (gravel), it is shown that the laboratory CBRd can be used to estimate the compaction and bearing capacity, because it correlates well with the parameters of the standard and modifed Proctor compaction tests. ...
    korelacija parametara, donji slojevi saobraćajnica, laboratorijska i terenska ispitivanja, dinamički kalifornijski indeks nosivosti CBRd
    ... indicate significant differences in the grain size distribution, and it was determined that the material is natural mineral soil, sandy gravel (Sa-Gr), and non-plastic, where one grain size or a grain size range (0.1-0.5 mm) predominates, while some intermediate grain sizes are missing. The material's ...
    ... the substrate (subgrade). CBR;y is a complex measure of the strength of a material, and depends on factors such as the grain size distribution, shape, and roughness of the grain, water content, and compaction, and can be expressed in the range of 20% < CBR, < 150% [6]. A CBR, test can be performed ...
    ... temporary landfill at 'Batajnica Inter- modal Terminal in Belgrade. The same material was used for laboratory and in-situ testing. The grain size distribution was determined on the basis of three representative samples in accordance with SRPS EN ISO 17892-4:2017. The identification-classification ...

  • Dating of alluvial sediments from borehole at the lower course of the Sava river and indications of the connection between their genesis and climate changes in the Pleistocene

    David Mitrinović, Jelena Zarić, Oliver Anđelković, Gyorgy Sipos, Dušan Polomčić, Milan Dimkić (2019)
    This paper analyses the way in which Pleistocene climate change and glaciations in Dinaric Mountains was reflected in the deposition of alluvial sediments in the Sava river Valley, using a case study of Belgrade Groundwater Source (BGS), the largest and most downstream alluvial water supply source along the Sava river. A stratigraphic analysis of the Quaternary sediments from two boreholes on this site, based on sediment dating, lithological members identification, grain size distribution analysis was performed. Comparison with the ...
    Pleistocene, Alluvial deposits, Climato-lithostratigraphy, Sava river, Belgrade groundwater source, Luminescence

  • Damage quantification of built stone on Dark Gate (Belgrade, Serbia): sample of damage index application for decay rate evaluation

    Maja Franković, Nevenka Novaković, Vesna Matović (2015)
    The Dark Gate is the monument of culture, part of the cultural and historical complex of the Belgrade Fortress. It is constructed of limestone blocks that after 270 years of exposure to environmental conditions and different anthropogenic influences show wide ranges of decay forms. During 2007, detail registration of all built limestone microfacies and weathering forms was done using tools of monument mapping. A correlation scheme ‘‘intensity– damage category’’ was made according to the type, intensity, and distribution of ...
    Krečnjak, mapiranje, Indeks raspadanja, brzina raspadanja, progresija
    ... connected with lime mortar. 283 processed, rectan- gular, less often trapezoid stone blocks are embedded in the facade of the gate. An average size of blocks is 50/25 cm. The surface area of south facade is 32 m? and the surface area of the stone built part of the north facade is 11.4 m?. ...
    ... ” (Fitzner et al. 1995) in scientific literature ' known as Fitzne's model mapping. The standard classification scheme was modified to fit the size of built stone blocks in Dark Gate. A correlation scheme was developed for the monument in which all observed weathering forms were related to ...
    ... to ISCS Glossary (ICOMOS-ISCS 2008). For determination of damage categories, intensities of weathering forms were correlated with the average size of stone blocks, function of structural elements and monu- ment's defined cultural value (Fitzner and Heinrichs 2002). @ Springer 6186 Based ...

  • Cultural Heritage and Protection of Hand-Wheeled Pottery Manufacture in Western Serbia: Characteristics of Zlakusa Pottery Based on Sem-Eds and Optical Microscopy

    Milošević Maja, Zdravković Alena, Đordjević Biljana, Jelić Ivana (2021)
    ... Observed pores in sample 1 are of random orientation and size, indicating slower rotations of the potter’s wheel during the manufacturing process. Sample 2 has a specific fluid-structure that is consistent with the way it was fabricated. By the size and orientation of the pores, it is evident that ...
    ... pots showed significant differences from the mineral composition, especially in the terms of elemental composition observed by EDS, to the distribution and appearance of pores concerning the manufacturing process. Further investigations are necessity for an establishment of the standards that ...

  • Optimizacija faznog razvoja Površinskog kopa Ciganuša – Škorac u cilju definisanja dugoročne dinamike eksploatcije

    Dejan Stevanović, Petar Marković, Mirjana Banković, Milan Živković (2022)
    Definisanje dugoročne dinamike razvoja rudarskih radova koja je u potpunosti usaglašena sa strateškim ciljevima Investitora, veoma je zahtevan zadatak, koji vrlo često podrazumeva veliki broj ograničenja. Adekvatno definisana dinamika razvoja rudarskih radova treba da obezbedi dugoročne zahteve u pogledu kapaciteta, kvaliteta i raspodele resursa neophodnih za ispunjavanje strateških ciljeva, koji se po pravilu svode na ostvarenje maksimalnog profita. Uspešno definisanje dinamike eksploatacije (posebno kod metaličnih ležišta) u najvećoj meri zavisi od optimizacije faznog razvoja površinskog kopa, odnosno od pravilnog ...
    dinamika razvoja, faze razvoja, optimizacija kopa, strateški ciljevi, Whittle

  • Medical Domain Document Classification via Extraction of Taxonomy Concepts from MeSH Ontology

    Mihailo Škorić, Mauro Dragoni (2019)
    This paper is a result of a task that was presented to attendants of Keyword Search in Big Linked Data summer school, that was organized by Vienna University of Technology, under the Keystone COST action in the summer of 2017. It presents a specific approach to the classification via creation of minimal document surrogates based on the US National medical library’s MeSH ontology, which is derived from the Medical Subject Headings thesaurus. In a series of previously classified medically ...
    document classification, MeSH, ontology, information extraction
    ... shows the uneven distribution of frequency classes even after this removal. Figure 12. Frequencies distribution before noise removal. Infotheca Vol. 19, No. 1, September 2019 65 Škorić M., Dragoni M., “Medical document classification...”, pp. 55–69 Figure 13. Frequencies distribution after noise removal ...
    ... [0-9]([.][0-9][0-9][0-9])*)|([0-9]+[.]txt)|([\r\n]+), док се све остало уклања.while everything else is removed. This reduced the file size over 450 times (new size: ∼0.5MB). Upon completion of the transformation, a new file is formed. In it, each new line represents a new document: it begins with the ...
    ... values. The concept names are derived from the rdfs:label, followed by the mesh:treeNumber of the same concept. The returned concepts are sorted by the size of the name from the longest to the shortest, in order for them to be searched in the documents without the risk of longest matches not being recognized ...

  • Значај петрографске анализе флуидних инклузија

    Стефан Петровић, Милош Велојић (2022)
    У раду је истакнут значај петрографске анализе током истраживања флуидних инклузија и приказане могућности ове методе на примерима неких од карактеристичних петрографских појава из различитих минерала. Петрографска анализа је први корак у испитивању флуидних инклузија. Правилно спроведена, петрографска анализа омогућава одређивање генетске везе флуидних инклузија и минерала домаћина, препознавање карактеристика флуидних инклузија и релевантну интерпретацију података из наредних корака истраживања. Петрографском анализом се дефинишу: а) дистрибуција флуидних инклузија у минералу; б) облик, величина и фазни састав флуидних инклузија; в) групације ...
    петрографија, флуидне инклузије, флуиди, групације

  • Concepts for Improving Machine Learning Based Landslide Assessment

    Miloš Marjanović, Mileva Samardžić Petrović, Biljana Abolmasov, Uroš Đurić (2019)
    Katastar klizišta, Podložnost, Hazard, Mašinsko učenje, Uzorkovanje, Validacija

  • Part of Speech Tagging for Serbian language using Natural Language Toolkit

    Ranka Stanković, Boro Milovanović (2020)
    Dok se razvijaju složeni algoritmi za NLP (obrada prirodnog jezika), osnovni zadaci kao što je označavanje ostaju veoma važni i još uvek izazovni. NLTK (Natural Language Toolkit) je moćna Python biblioteka za razvoj programa zasnovanih na NLP-u. Pokušavamo da iskoristimo ovu biblioteku za kreiranje PoS (vrsta reči) oznake za savremeni srpski jezik. Jedanaest različitih modela je kreirano korišćenjem NLTK API-ja za označavanje. Najbolji modeli se transformišu sa Brill tagerom da bi se poboljšala tačnost. Obučili smo modele na označenom ...
    obrada prirodnog jezika, mašinsko učenje, neuronske mreže
    ... except Default and RegExp tagger are created by training on an annotated dataset. We were training on the 90% size of the original dataset size and measured accuracy on a remaining 10% size with 10-fold evaluation1. Results of the trained tagger models can be seen in Table V, with the accuracy calculated ...
    ... n and a Verb. Cumulative distribution of PoS categories is shown in Figure 1. First five categories account to 57% of all tokens. These numbers help us in creating the taggers and interpreting their performance. Fig. 1. Word PoS category cumulative distribution For a complete evaluation ...
    ... (SCONJ), symbol (SYM), verb (VERB) and other (X). The tags are distributed as shown in the Table III. TABLE III PART-OF-SPEECH CATEGORY DISTRIBUTION AND MAPPING UD_POS COUNT % N_POS NOUN 42936 21.51% N, N:m, N:f, N:n PUNCT 31477 15.77% PUNCT, SENT VERB 20599 10.32% V, V:m, V:f, V:n ...

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation