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Упит dcterms_creator_txt:Papazachos C.B., G.N. Tsokas, I.N. Tziavos, Vasiljević Ivana, Stampolidis A.

1665 items

  • 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
    ... a % - b 200 - ii D tl/(:· AŠ |=} 180 - 70 //E?] “ (-P-4"| AAJA N B D/_T'Jč, ___160 – A “A Ee . PrO M “ A Š Š D n f Č ĆA A -- o B 140 ; _ [- Ž . A a 50 M ~ : AAA AA n 070 - BI A AAAA %Ž mpon-- D A Z AA _ |j A 0 7 O A ŠA -& W m 1 l 100 _Z A a A |} A 30 80 ii CBRa(%) a E iii ...
    ... performed on a subgrade layer made of natural stone aggregate (gravel). The subgrade layer was constructed above the embankment layer, which consist- ed of natural material (sand) in three layers with a thickness of 0.3 m. Spreading was performed in a layer with a thickness of 0.35 m under a loose condition ...
    ... Email: milan.bogdanovic(Ottpaqi.com. This paper presents a dynamic California Bearing Ratio (CBR,) device that can be usedon 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 ...

  • A Data Driven Approach for Raw Material Terminology

    Olivera Kitanović, Ranka Stanković, Aleksandra Tomašević, Mihailo Škorić, Ivan Babić, Ljiljana Kolonja (2021)
    The research presented in this paper aims at creating a bilingual (sr-en), easily searchable, hypertext, born-digital, corpus-based terminological database of raw material terminology for dictionary production. The approach is based on linking dictionaries related to the raw material domain, both digitally born and printed, into a lexicon structure, aligning terminology from different dictionaries as much as possible. This paper presents the main features of this approach, data used for compilation of the terminological database, the procedure by which it has ...
    sirovine, rudarstvo, terminologija, rečnik, terminološka aplikacija, mobilna aplikacija, digitizacija, leksički podaci, korpusi, otvoreni povezani podaci

  • A necessary and sufficient condition for an algebraic integer to be a Salem number

    Dragan Stankov (2019)
    We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient that is relatively large. We also determine the probability that an arbitrary power of a Salem number, of certain small degrees, satisfies this condition.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials
    ... We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient ...
    ... Stankov In [9] Vieira, extending a result of Lakatos and Losonczi [3], presented a sufficient condition for a self-reciprocal polynomial to have a fixed number of roots on the complex unit circle U = {z ∈ C : |z| = 1}. Let p(z) = adzd +ad−1zd−1 + · · ·+a1z +a0 be a d-th degree self-reciprocal polynomial ...
    ... 2l roots on U and these roots are simple. Here we present, in a sense, a result which lies in the opposite direction of a special case of this theorem. Namely, we shall prove the following Theorem 1.1. A real algebraic integer τ > 1 is a Salem number if and only if its minimal polynomial P (x) is ...

  • Resource-based WordNet Augmentation and Enrichment

    Ranka Stanković, Miljana Mladenović, Ivan Obradović, Marko Vitas, Cvetana Krstev (2018)
    In this paper we present an approach to support production of synsets for SerbianWordNet(SerWN)byadjustingPrincetonWordNet(PWN)synsetsusing several bilingual English-Serbian resources. PWN synset definitions were automatically translated and post-edited, if needed, while candidate literals for Serbian synsets were obtained automatically from a list of translational equivalents compiled form bilingual resources. Preliminary results obtained from a setof1248selectedPWNsynsetsshowthattheproducedSerbiansynsetscontain 4024 literals, out of which 2278 were offered by the system we present in this paper, whereas experts added the remaining 1746. Approximately one half of ...
    WordNet, bilingual resources, term alignment, parallel lists

  • Bilingual lexical extraction based on word alignment for improving corpus search

    Jelena Andonovski, Branislava Šandrih, Olivera Kitanović (2019)
    Library and Information Sciences,Computer Science Applications

  • A survey of greenhouse gases production in central European lignites

    Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)
    Lignit, Gasovi sa efektom staklene bašte, Ugljen dioksid, Metan, Azotni oksid

  • 3D modeling and monitoring of karst system as a base for its evaluation and utilization: a case study from eastern Serbia

    Saša Milanović, Zoran Stevanović, Ljiljana Vasić, Vesna Ristić-Vakanjac (2013)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • A Mathematical Learning Environment Based on Serbian Language Resources

    Radojičić Marija, Obradović Ivan, Stanković Ranka, Utvić Miloć, Kaplar Sebastijan (2018)
    In recent years, in line with ever growing usage of Information technology, the learning environments are changing. The amount of available learning materials in various forms has increased. These new environments demand comprehensive learning systems, which enable management of the learning corpus with special attention paid to relevant lexical resources. In this paper we present the concept of a Mathematical Learning Environment in Serbian (MLES), which is based on a corpus of mathematical materials and various lexical resources, enabling ...
    mathematical content, text processing, mathematical formulae

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

  • Two approaches to compilation of bilingual multi-word terminology lists from lexical resources

    Branislava Šandrih, Cvetana Krstev, Ranka Stanković (2020)
    In this paper, we present two approaches and the implemented system for bilingual terminology extraction that rely on an aligned bilingual domain corpus, a terminology extractor for a target language, and a tool for chunk alignment. The two approaches differ in the way terminology for the source language is obtained: the first relies on an existing domain terminology lexicon, while the second one uses a term extraction tool. For both approaches, four experiments were performed with two parameters being ...
    Linguistics and Language,Software,Artificial Intelligence,Language and Linguistics
    ... mikrofišu ‘title field on a microfiche’ or A_N_(A_N)gen in poslednja sveska serijske publikacije ‘last issue of the serial publication’ where A stands for an adjective, N for a noun and PREP for a preposition. Each of these components can be a single word or a MWU. Our system was used in a mode in which all ...
    ... bilingual, aligned, domain-specific textual resources, a terminological list and/or a term extraction tool in a source language, and a system for the extraction of terminology-specific noun phrases (MWTs) in a target language, it is possible to compile a bilingual aligned terminological list. This paper ...
    ... were observed in order to build a discrimina- tive model for the bilingual lexicon induction. Hazem and Morin (2016) The authors built two vector space models: a domain model and a gen- eral model (using a general purpose dictionary). If a domain term exists in a general model, its vector representation ...

  • The Usage of Various Lexical Resources and Tools to Improve the Performance of Web Search Engines

    Krstev Cvetana, Stanković Ranka, Vitas Duško, Obradović Ivan (2008)
    In this paper we present how resources and tools developed within the Human Language Technology Group at the University of Belgrade can be used for tuning queries before submitting them to a web search engine. We argue that the selection of words chosen for a query, which are of paramount importance for the quality of results obtained by the query, can be substantially improved by using various lexical resources, such as morphological dictionaries and wordnets. These dictionaries enable semantic ...
    LR web services, MultiWord Expressions & Collocations, Information Extraction, Information Retrieval

  • Development of terminological resources for expert knowledge: a case study in mining

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Aleksandar Cvjetić (2015)
    ... 15 20 25 30 35 40 fi n g e rs fo re a rm h a n d s h o u ld e r u p p e r a rm e y e fa c e h e a d ( o th ) a n k le fo o t k n e e s h a n k th ig h to e o th e r p a rt to rs o ( o th ) in te r. o rg a n s arm head leg torso 5 3 9 1 18 6 2 ...
    ... languages are linked, usually by a list of term pairs. Terminological resources featuring a hierarchy are taxo- nomies. If richer semantic relations exist between con- cepts, the terminological resource becomes either a thesaurus or an ontology. While opinions exist that a clear boundary between the ...
    ... 2012). One of the means to secure interoperability within a specific domain is the use of ontologies, containing a comprehensive common domain vocabulary. In other words, all terms used within a domain need to be standar- dized, with a clear and unambiguous definition, accompa- nied by lexical ...

  • Digital Library From A Domain Of Criminalistics As A Foundation For A Forensic Text Analysis

    Dalibor Vorkapić, Aleksandra Tomašević, Miljana Mladenović, Ranka Stanković, Nikola Vulović (2017)
    U ovom radu predstavljen je model koji omogućava prikupljanje, pripremu, opis metapodataka, upravljanje i eksploataciju, uključujući pretragu punog teksta dokumenata iz domena kriminalistike napisanih na srpskom jeziku. Predloženi pristup primenjuje se na veb portalu koji sakuplja različite tekstove nastale iz časopisa Akademije za kriminalistiku i policijske studije, Krivičnog zakona Srbije, konferencija „Tara“ i „Reiss“, kao i iz nekih doktorskih disertacija vezanih za ovu oblast istraživanje. Nakon obrade teksta, korpus koji sadrži preko 5500 stranica običnog teksta, kreiran je i ...
    Omeka, Wordnet, pretraga punog teksta, morfološka i semantička pretraga teksta, proširenje upita

  • A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić (2023)
    This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...
    системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFIS

  • Flotability of chalcopyrite from the Rudnik deposit

    Đurica Nikšić, Predrag Lazić, Milena Kostović (2021)
    Директно селективно флотирање олова, бакра и цинка у флотацији рудника „Рудник” датира од 1984. године. Технолошка шема омогућава директно издвајање селективних концентрата у три циклуса. У првом циклусу се издваја минерал олова (галенит), док су минерал бакра (халкопирит) и минерал цинка (марматит) депримирани. У другом циклусу се оток концентрације минерала олова кондиционира и припрема за издвајање минерала бакра. Након кондиционирања, у овом циклусу се издваја минерал бакра. У трећем циклусу се оток концентрације минерала бакра кондиционира и припрема за ...
    Директно селективно флотирање, халкопирит, KAX, NaCN
    ... achieved at a pH of 6.20. Increasing the pH to 7.20 leads to a sharp decrease in chalcopyrite recovery to 38.82%. A further increase in the pH to 8.20 leads to a sharp increase in the recovery of chalcopyrite to 72.24%, which is the second maximum. Increasing the pH value to 9.20 leads to a sharp decrease ...
    ... of the magnetic stirrer. In flotation experiments, a reagent from the xanthate group, potassium amyl xanthate (KAX), was used as a collector. Sodium cyanide (NaCN) reagent was used as a depressant. Aqueous solutions of these reagents, at a concentration of 1 g/L, were added to the flotation cell ...
    ... - Flotability of chalcopyrite as a function of pulp pH, at a consumption of KAX of 4 mg/L pH Recovery [%] 6.20 96.21 7.20 64.56 8.20 87.90 9.20 86.06 10.20 68.37 Figure 3 - Flotability of chalcopyrite from"Rudnik" mine as a function of pulp pH, at a consumption of KAX of 4 mg/L ...

  • Fuzzy expert analysis of the severity of mining machinery failure

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    Mining machinery failure is almost an everyday occurrence. Usually the failures bare certain consequences, which require additional financial costs to repair and restore the system to its operational state. The consequences are viewed through negative and damaging effects a failure has on the machine, health and safety of the employees, work environment, and on the environment. The removal of the consequences of the failure requires additional financial investment, which has a negative impact on the company’s business. In order ...
    Severity of failure, Severity of failure assessment, Mining machinery, Fuzzy sets, Fuzzy logic
    ... ery failure Dejan V. Petrović a,∗, Miloš Tanasijević b, Saša Stojadinović a, Jelena Ivaz a, Pavle Stojković a a University of Belgrade, Technical Faculty in Bor, VJ 12, Bor, Serbia b University of Belgrade, Faculty of Mining and Geology, Djusina 7, Belgrade, Serbia a r t i c l e i n f o Article history: ...
    ... significance of severity of a failure as a risk indicator especially in mining sector. Consid- ering the failure severity through negative effects of a machine failure provides the higher reliability of a risk assessment model. The ultimate goal of this research is a development of a risk assessment model ...
    ... failure is a complex task that includes a number of causes and effects pertaining to a risky event, based on which conclusions about the observed phenomenon can be drawn. The risk of mining machinery failure is always present, es- pecially in industrial systems that have been in use for a long time. ...

  • On the distribution modulo 1 of the sum of powers of a Salem number

    Dragan Stankov (2016)
    It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials
    ... (i) find a set A of local minimum points, a set B of local maximum points, and a set S of (horizontal inflection) stationary points on [−1, 1] of Q (x); (ii) find a set A of fractional parts of values at local minimum points, a set B of fractional parts of values at local maximum points, and a set S ...
    ... in R/Z. A Pisot number is a real algebraic integer greater than 1 whose other conjugates have modulus less than 1. A Salem number is a real algebraic integer greater than 1 whose other conjugates have modulus less than or equal to 1 and a conjugate with modulus one. It is easy to see that a E-mail ...
    ... distribution modulo 1 of the sum of powers of a Salem number Sur la répartition modulo 1 de la somme des puissances d’un nombre de Salem Dragan Stankov Katedra Matematike RGF-a, University of Belgrade, Beograd, Ðušina 7, Serbia a r t i c l e i n f o a b s t r a c t Article history: Received 1 February ...

  • Quantitative analysis of syllable properties in Croatian, Serbian, Russian, and Ukrainian

    Biljana Rujević, Marija Kaplar, Sebastijan Kaplar, Ranka Stanković, Ivan Obradović, Jan Mačutek (2021)
    slogovi, distribucija rang-preciznost, slovenski jezici
    ... end a�er their nuclei, i.e., a�er a vowel or a syllabic consonant. �e maximum onset principle is ‘blindly’ respected in this step, and thus, preliminarily, all syllables (the last syllable in a word being a possible exception, as it must contain its coda if there is one) are kept open. If, a�er the ...
    ... tant role,1 and a re-analysis of their data, with word length expressed in syllables, could lead to a stronger correlation. 1. Köhler (2012: 108) writes, albeit in a slightly di�erent context, that “an indirect relationship … is a good enough reason for more variance in data and a weaker �t” – in ...
    ... syllable contains a nucleus (a vowel or a syllabic consonant), we �rst had to solve the problem of zero-syllabic words (each of them consisting of one non-syllabic consonant) which occur in all the languages we work with (prepositions, and in the case of Ukrainian also two particles and a conjunction) ...

  • 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

  • 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
    ... Vukasinovic a, Dusan Gordic a, *, Marija Zivkovic b, Davor Koncalovic a, Dubravka Zivkovic a a University of Kragujevac, Faculty of Engineering, Sestre Janjic Str. 6, 34000, Kragujevac, Serbia b University of Belgrade, Faculty of Mining and Geology, Djusina Str. 7, 11000, Beograd, Serbia a r t i c l ...
    ... desirable (normative scenarios e “How to achieve a desirable future?” or “How a solution to a particular problem might look?“). Backcasting is one of the approaches for creating the third group of scenarios. Backcasting could be defined as generating a desirable future and looking backwards from this ...
    ... biomass and a location of the plant for its valorisation enables the determination of optimal transport routes. All of the above data should be systematized into a database that is used as an input to a mathematical model. 2.3. Optimal quantity of biomass for using under current condition A certain amount ...