Претрага

Упит dcterms_subject_txt:fragmentation size

320 items

  • Characterization of Natural Clay from Bogovina (Serbia) and Possible Utilization in Sorption of the Herbicides

    Lazar Kaluđerović, Zorica Tomić, Rada Đurović-Pejčev, Maja Milošević (2021)
    ... S-metolachlor and clomazone from the environment. The efficiency of the sorption of S-metolachlor by montmorillonite depends on the size of the interlayer space, the type of interchangeable cation, and also on the characteristics of the montmorillonite surface. Disclosure of Interest: ...

  • Investigation of Co0.9Ho0.1MoO4 Nanopowders Obtained by Glycine Nitrate Procedure

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... Department of Chemistry, Faculty of Science and Mathematics, University of Niš, Fišegradska 33, 18000 Niš, Serbia *mrosic(ovinca.rs Nanometric size CoooHooiMoO+ powder particles were obtained by applying glycine nitrate procedure (GNP). Powder properties have been studied by DTA, X-ray diffraction ...

  • Combining Heterogeneous Lexical Resources

    Cvetana Krstev, Duško Vitas, Ranka Stanković, Ivan Obradović, Gordana Pavlović-Lažetić (2004)
    development of lexical resources, morphological dictionaries, WordNet
    ... construction), the corresponding dictionaries of word forms, and morphological finite-state automata that model certain classes of lemmas. The current size of SMD of simple lemmas is around 65.000, and they produce a dictionary of word forms with more than 930.000 entries. An example of an entry in ...
    ... developed in the scope of the Balkanet project (Stamou, 2002) following the model adopted for the EuroWordnet project (Vitas, 2003). The current size of SWN is 6290 synsets with 10583 literal string-sense pairs. Since the core of wordnets developed for Balkan languages was produced by translation ...
    ... that reason, the production of the fully semantically marked Serbian DELAS has been postponed until the two resources will become comparable in size. Besides that, the development of the Serbian morphological dictionary of compounds is in its initial phase, which is a serious drawback for the ...

  • 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 ...

  • BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties

    Marija Šuljagić, Ivan Petronijević, Miljana M. Mirković, Aleksandar Kremenović, Adis Džunuzović, Vladimir B. Pavlović, Aleksandra Kalezić-Glišović, Ljubica Andjelković (2023)
    To investigate the influence of spinel structure and sintering temperature on the functional properties of BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1), NiFe2O4, ZnFe2O4, and Ni0.5Zn0.5Fe2O4 were in situ prepared by thermal decomposition onto BaTiO3 surface from acetylacetonate precursors. As-prepared powders were additionally sintered at 1150 °C and 1300 °C. X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS) were used for the detailed examination of phase composition and morphology. The magnetic, dielectric, and ...
    ferroelectric, dielectric properties, magnetic properties, titanate/ferrite composites, phase composition
    ... types of particles, different in size and shape, Figure 2. The particles which belong, to the BaTiOx are bigger (0.5–1 um) in comparison to ferrite particles that are in the sub-100 nm range. It was observed that ferrite particles formed agglomerates due to the size-driven surface activity [66,67] ...
    ... metal carboxylates, and metal acetylacetonates were recognized as precur- sors to fabricate nanostructured magnetic oxides with uniform and narrow size distribution of nanoparticles, due to their high purity and cheap production [59—65]. This paper addresses a simple route to prepare a series of ...
    ... shell, and vice versa [68]. Mass magnetization values at room temperature for the sintered samples are listed in Table 2. Microstructure (grain size) and phase composition, as well as their interplay guuide the magnetization process and influence magnetic properties in general [69]. With an increase ...

  • Depth estimation of archeological objects using Euler 3D deconvolution of magnetic data

    Vesna Cvetkov, Ilija Vasiljević, Mirko Petković (2015)

  • Synthesis and characterization of nanostructured Ca0.9Er0.1MnO3

    Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić (2023)
    ... in their appropriate stoichiometric ratios. Obtained Cao,Ero,,MnOx powder was calcined in a temperature range of 800-1000 *C for 15min. Particle size, lattice parameters, structural changes, and specific surface area were investigated. DTA, X-ray diffraction (XRD), FTIR, and Field emission scanning ...

  • Jeleč grad- još nepriznati objekat geonasleđa

    Marija Radisavljević, Danica Srećković Batoćanin, Vladan Vidosavljević, Irena Kajtez (2022)
    Остаци средњовековног града Јелеча на једном од врхова планине Рогозне (1262 m), по неким веровањима представљаju купу угашеног вулкана. Рогозна je позната по појавама скарновске Cu–Au минерализације, а трагови рударске активности и важних путева још од античких времена и даље постоје у непосредној околини. О томе сведочи и османски назив за Рогозну: Gümüş Dağ (Сребрна планина). Време изградње Јелеча је непознато. Постоје индиције да је постојао још у 6. веку, али се помиње први пут средином 12. века. Поуздан податак ...
    Rogozna, Jeleč, srednjevekovno utvrdjenje, kvarc latit, objekat geonasledja

  • Утицај обртног магнетног поља на дерацемизацију кристала натријум-хлората

    М. Милојевић, А. Жекић, П. Дабић, Б. Вучетић, Б. Максимовић (2023)
    ... rpm, |. – orientation of crystals is dominant, while at 600 rpm, D – orientation of crystals is dominant. X-ray structural analysis showed that the size of the lattice parameter of the obtained crystals does not depend on their oricntation and field rotational frequency, but only on its strength ...

  • Hyperpycnites within the Devonian-Carboniferous flysch of the Carpatho-Balkanides (Kostadinovica, eastern Serbia)

    Miloš Radonjić (2020)
    This study presents new discoveries of vascular plants and the trace fossil Dictyodora liebeana (GEINITZ) from the Devonian–Carboniferous Kučaj-Zvonce flysch of the Carpatho-Balkanides and the implications of this fossil association for its sedimentary setting. The occurrence of the described plant debris in a deep-marine environment indicates the presence of hyperpycnites within the siliciclastic turbidites exposed at the Kostadinovica locality. The sedimentological data and the characteristics of the fossil material support the proposed model in which the sediment was at ...
    Mississippian flora, Dictyodora liebeana (GEINITZ), hyperpycnites, Kučaj-Zvonce flysch, Carpatho-Balkanides
    ... feldspars and lithic fragments. Finer rocks are represented by siltstones or mudstones. Way up criteria (primarily the fining upward trend of grain size, relations of erosive/gradual transitions and the relationships of cross-lamination within beds) were used to recognize the (Fig. 1a, b). In terms ...
    ... lower part of unit B. Sedimentary structures of the finer-grained inter- Figure 3. A sedimentological column of the Kostadinovica succession. Grain size is shown on the right-hand side of the column (si – siltstones, f – fine- grained sandstone, m – medium-grained sandstone, c – coarse-grained sand- ...
    ... 73/3134 vals of this unit are obscured by cleavage, but wavy and rhythmic parallel lamination is recognized along with minute variations of grain size of the different lamina. Sandstone layers appear either as intervals of graded turbidite units or solitary structureless beds. Turbidite beds are ...

  • A Lexical Approach to Acronyms and their Definitions

    Cvetana Krstev, Duško Vitas, Ranka Stanković (2015)
    In this paper we present a comprehensive approach to acronyms for Natural-Language Processing (NLP) of Serbian texts. The proposed procedure includes extraction of acronyms and their definitions that are usual Multi-Word Units (MWUs), shallow parsing of MWUs that enables MWU lemmatization and production of entries in morphological electronic dictionaries, both for MWU and acronyms, that are provided with grammatical, syntactic, semantic and domain information. This approach enables representation that reflects complex relations between acronyms and their definitions.
    ... required by morphological e-dictionaries, while e-dict_(MW|acr)_forms represent in- flected forms of MW names and acronyms, respectively. Input Size Output Size 1 corpus 23MW (acr., infl. def.)all 3,942 2 (acr., infl. def.)diff 2,163 foreign 96 manually 57 rejected 233 (acr., SWLs)diff 2,812 3 (acr ...
    ... . Moon, S., S. Pakhomov, and G. B. Melton, 2012. Auto- mated disambiguation of acronyms and abbreviations in clinical texts: window and training size considerations. In AMIA Annual Symposium Proceedings, volume 2012. American Medical Informatics Association. Pustejovsky, J., J. Castano, B. Cochran ...

  • Ventex: an expert system for mine ventilation systems analysis

    Nikola Lilić, Ranka Stanković, Ivan Obradović (1997)
    roblems relating to mine ventilation systems analysis are usually of a very complex nature. They involve the estimation of numerous interdependent parameters pertaining to the network status, ventilation status, ventilation system stability, air current losses, climate conditions, gas state, fire risk and dangerous dust pollution risk. The solution to these problems relies, to a great extent, on numerical methods. With the development of computer technology these methods were incorporated as numerical routes in software packages, such as the mine ...
    expert system, mine ventilation

  • 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

  • Hydrothermal Synthesized and Alkaline Activated Carbons Prepared from Glucose and Fructose—Detailed Characterization and Testing in Heavy Metals and Methylene Blue Removal

    Sanja Krstić, Milan Kragović, Maja Pagnacco, Vladimir Dodevski, Branka Kaluđerović, Miloš Momčilović, Ivica Ristović, Marija Stojmenović (2018)
    glukoza, fruktoza, аktivni ugalj, hidrotermalni tretman, aktivacija hidroksida, teški metali, metilen plavo
    ... precursors. On the contrary, carbon samples treated with LiOH and NaOH maintained their microspherical structures but with different particle size for the whole order of size. • All investigated samples showed high affinity for lead cadmium and zinc ions. Samples activated with KOH showed better removal of ...
    ... at a fixed temperature). Using BJH (Barrett, Joyner and Halenda) method [41], for every sample from desorption branch of the nitrogen isotherm pore-size distributions were calculated. In addition, mesopore surface (Smeso) and micropore volume (Vmicro) were also calculated from the isotherms. By using ...
    ... and Figure 4b for fructose. Also, for a better comparison, the influence of different activation agents on structure, porosity developments and pore-size distributions were determined and presented as inserts in Figure 4 (insets 1, 2 and 3). As it is clear from Figure 4a and b, for all samples similar ...

  • Post Early Miocenevertical-axis clockwise rotation in the West Vardar Zone of Serbia

    Vesna Lesić, Emo Marton, Vesna Cvetkov, Dragana Jovanović (2018)
    ... both of Oligocene age. Samples were drilled and oriented in situ both by magnetic and sun compasses. In the laboratory samples were cut into standard size specimens, then subjected to standard paleomagnetic measurements which included the measurement of the natural remanent magnetization, followed by ...

  • 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
    ... 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 size: d10, d50 ...
    ... Grid Journal of Sustainable Development of Energy, Water and Environment Systems Year 2015 Volume 3, Issue 3, pp 217-229 222 cells size was refined to 12.5 m × 12.5 m in the area of interest, wherewell density and extraction rates were high (Figure 5). To illustrate the flow field ...

  • Some examples of interactions between certain rare earth elements and soil

    Zlatko Nikolovski, Jelena Isailović, Dejan Jeremić, Sabina Kovač, Ilija Brčeski (2021)
    Freundlich adsorption isotherm, sequential extraction, metallic ions, ICP-OES
    ... radiation from the copper (Cu) anticathode, Wavelength, nm 15.4178 Scan range, 2  o 2 – 70 Step size, 2  o 0.01 Time constant, o / min 10 Scan range (clay minerals), 2  o 2 – 30 Step size (clay minerals), 2  o 0.01 Time constant (clay minerals), o / min 5 Acce pted M anuscr ipt ...
    ... adjusted. The solutions were mixed at the shaker at the speed of 80 rpm for two hours, and then they were filtered through “blue band” filter paper (pores size < 2 μm) into the 100 mL volumetric flasks. The sediments were rinsed three times with 10 mL distilled water each and filled up with distilled water ...

  • Mesozoic carbonate rocks in Serbia used as dimension stone

    Vesna Matović, Tijana Vojnović Ćalić (2016)
    The building industry in Serbia uses, to a great extent, imported natural stone for architectural purposes. The significance of local deposits, particularly limestones, is not adequately perceived despite the country’s abundance of these valuable resources. Therefore, this study focuses on Serbia’s Mesozoic carbonate rocks, specifically on the deposits of four selected quarries: Klisura, Skrzut, Struganik, and Tisnica. The quality and prospects of the application of these limestones has not yet been the subject of a detailed, comprehensive investigation. Therefore, ...
    Ukrasni kamen, Mezozoik, Krečnjak, Srbija, Petrografija, Fizičko-mehanička svojstva
    ... crucial criterions for the profitable production of dimension stone are the soundness of the deposit (possibility of block production of a suitable size) and market demand (Luodes et al. 2000). Despite the fact that concrete and glass were the prin- cipal materials in architectural design during ...
    ... y, the rock mass is fragmented into blocks by a system of faults and fractures that reduce the possibility of extracting blocks of commercial size. The Struganik quarry has been exploited for architectural stone for over three decades. It is situated in western Serbia, within the territory ...
    ... light connected to a Leica DC 300 digital camera. The thin sections were used to determine the mineral composition and microtextural features (size and type of allochem) for the purpose of rock classification, according to Folk (1959) and Flugel (2004). The CaO and MgO contents were determined ...

  • Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays

    Vladimir Simić, Dragana Životić, Zoran Miladinović (2021)
    Management, Monitoring, Policy and Law,Nature and Landscape Conservation
    ... ogy and the achieved results. Table 3. Perspective deposits of bentonite and bentonite clays in Serbia [53]. Size of deposit after [44]. None of these deposits are in operation. Deposit Size of Deposit Quality (Grade) Method of Exploitation Number of Layers and Their Thickness (M) Depth ...
    ... deposits, bedded and lenticular, with uniform structure, thickness, and quality of mineral raw materials 100–150 150–200 300–400 Deposits of medium size, bedded and lenticular, with uniform structure, thick- ness, and quality of mineral raw mate- rial 50–100 100–200 200–300 2 Large deposits, ...
    ... and lenticular, without uniform structure and thick- ness, with variable quality of mineral raw materials - 50–100 100–200 Deposits of medium size, bedded and lenticular, without uniform structure - 25–50 50–150 Resources 2021, 10, 63 7 of 18 and thickness, with variable quality of ...

  • Serbian NER&Beyond: The Archaic and the Modern Intertwinned

    Branislava Šandrih Todorović, Cvetana Krstev, Ranka Stanković, Milica Ikonić Nešić (2021)
    U ovom radu predstavljamo srpski književni korpus koji se razvija pod okriljem COST Akcije „Distant Reading for European Literary History” CA16204. Koristeći ovaj korpus romana napisanih pre više od jednog veka, razvili smo i učinili javno dostupnim Sistem za prepoznavanje imenovanih entiteta (NER) obučen da prepozna 7 različitih tipova imenovanih entiteta, sa konvolucionom neuronskom mrežom (CNN), koja ima F1 rezultat od ≈91% na test skupu podataka. Ovaj model je dalje ocenjen na posebnom skupu podataka za evaluaciju. Završavamo poređenje ...
    ... users can naviga- te to http://ner.jerteh.rs/ in order to apply the SrpCNNER model directly on input text. The model can also be applied to a custom- size collection of text files using the previously mentioned NER&Beyond web platform. story), https://zenodo.org/communities/eltec 7 SrpELTeC, https:/ ...
    ... the gold standard. The cumulative values of entities on all samples are indicated in the first row (ID “sample”). Column ∑ tok indicates a novel’s size in terms of tokens. 4.2 Training We trained our SrpCNNER model on the SrpELTeC-gold corpus using the spaCy Pyt- hon module, version 3.0. In order ...
    ... made the following adjust- ments to the default configuration (referring to the corresponding file blocks): [components.tok2vec.model.encode] changed size of the token-to-vector layer from 96 to 300, that is maximum recommended value (width parameter); [components.ner.model] changed width of a hidden ...