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Упит dcterms_subject_txt:Control and Systems Engineering

2382 items

  • Application of Membrane Technology for Separation CO2 from Natural Gas

    Lola Tomić, Dušan Danilović, Vesna Karović Maričić, Branko Leković, Miroslav Crnogorac (2020)
    Natural gas consists of a mixture of hydrocarbons with the largest share of methane, and non-hydrocarbon impure components such as N2, CO2 and H2S. In order to fulfill the gas market requirements, it is necessary to separate these unwanted components from the natural gas stream. There are several available technologies for the separation of CO2 from natural gas, such as: polymeric membranes, cryogenic distillation, absorption and adsorption. In this paper is presented the mechanism of CO2 separation using membrane technology, ...
    separacija CO2, polimerne membrane, membranski moduli

  • The shear strength evaluation of rough and infilled joints and its indications for stability of rock cutting in schist rock mass

    Dušan Berisavljević, Zoran Berisavljević, Svetlana Melentijević (2022)
    Construction of E75 highway section through Grdelica gorge was one of the most demanding projects realized in recent Serbian history. The alignment approximately 25 km long consists of several tens of bridges, two tunnels, three galleries and cuts with total length of 6 km. The alignment passes through highly anisotropic Palaeozoic schist rock formation of different weathering grades. This study focuses on shear strength properties of discontinuities, which are found to be the critical feature contributing to the occurrence ...
    Diskontinuitet, nelinearni kriterijum loma, anizotropija, hiperbolična anvelopa

  • Estimating hydraulic parameters for the complex hydrodynamic models

    Dušan Polomčić, Dragoljub Bajić, Jelena Ratković, Bojan Hajdin (2018)
    Hydrodynamic models have usually been calibrated manually, by trial-and-error, with different values of hydraulic parameters and hydraulic characteristics of boundary conditions. This method of calibration and estimation of hydraulic parameters requires an extensive knowledge and experience of experts, but whether the resulting solution includes an optimal set of parameters still remains an open question. An optimization method founded upon the Gauss-Marquardt-Levenberg algorithm, along with PEST software based on that algorithm, introduces automation of model calibration with regularization, which substantially ...
    kalibracija, optimizacija, PEST, koeficijent filtracije

  • Analysis of the correlation between modified secondary and primary compression index on the example of old municipal waste in Serbia

    Dragoslav Rakić, Irena Basarić Ikodinović, Jovana Janković, Tina Đurić (2022)
    The paper presents the results related to the determination of the index of primary and maximum and minimum indices of secondary compression, i.e. modified primary and secondary compression indices (Cc, Cc', C'min, C'max), obtained by laboratory testing of artificially prepared municipal waste samples (three series of 9 samples in total) in an oedometer apparatus with a diameter of 20 cm. Old municipal waste was used, which was taken from two landfills in Serbia, one that is ...
    municipal solid waste, secondary compression index, ratio of modified secondary and primary compression index

  • The rational technology model selection of the underground drivage development for the given conditions

    Tokalić Rade, Vidanović Nebojša, Savić Ljubinko (2013)

  • The third order mean-based Jarratt-type method for finding simple roots of nonlinear equation

    Ralević Nebojša, Ćebić Dejan, Pavkov Ivan (2015)

  • Correlation of uniaxial compressive strength with the dynamic elastic modulus, p –wave velocity and s –wave velocity of different rock types

    Jelena Majstorović, Miloš Gligorić, Suzana Lutovac, Milanka Negovanović, Luka Crnogorac (2019)
    Knowing mechanical properties of rocks incorporated with ultrasonic waves velocities investigations provide a secure basis for mine modelling. Uniaxial compressive strength, dynamic elastic modulus and ultrasonic waves velocities are just some of the rock properties that indicate on presence of discontinuities, stratification and fissures of rocks. Determining the relationship of these rock properties testing the rock samples that are corresponding to different rock types extracted from different mineral deposits represents the core of this study. In this paper, we ...
    линеарна регресија, метода најмањих квадрата, динамички модул еластиности, брзина уздужних таласа

  • Formative evaluation of e-learning projects with the logical framework approach

    Roberto Linzalone, Giovani Schiuma, Ivan Obradović, Ranka Stanković (2015)
    ... linear and systems thinking approaches for program evaluation illustrated using the Indiana Interdisciplinary GK-12, Evaluation and Program Planning, Vol. 32 No. 3, p. 187-196, 2009. [23] Chen, H., Practical program evaluation: Assessing and improving planning, implementation, and effectiveness ...
    ... 1996). Characteristics of the project are: complex accomplishment, uniqueness of the output, limited duration, clear and agreed goal, continuous process of planning and control of different resources, interdependent constraints of time-cost-quality [8][9]. All the projects, despite their uniqueness ...
    ... organizations, communities, or systems as a result of a project (it reveals in the long term, within 7-10 years) [11]. A 'cause-effect' relation regulates the mechanism of creation of outcomes and impacts, whose structure can be linear or systemic (complex). Linearity and Complexity of the cause-effect ...

  • Application of Thermal Imaging in Surface Mining

    Milanka Negovanović (2022)
    Termalno snimanje se sve više koristi u rudarskoj industriji kao jedan od dijagnostičkih alata za praćenje određenih proizvodnih procesa, kao i stanja opreme i mašina. Predstavlja nedestruktivnu i beskontaktnu metodu ispitivanja koja omogućava rano otkrivanje problema, planiranje održavanja sa minimalnim kvarovima, sprečavanje neplaniranih poremećaja, posmatranje materijala u nepristupačnim ili opasnim područjima i poboljšanje bezbednosti i produktivnosti. Termalno snimanje koristi specijalizovane termalne kamere sa unutrašnjim detektorima koji identifikuju veoma male temperaturne varijacije i proizvode sliku tog nevidljivog infracrvenog ili toplotnog ...
    Termalno snimanje, nedestruktivne metode testiranja, površinska eksploatacija, termalne kamere, rudarske operacije

  • A Variant of Sharma-Aroras Optimal Eighth-Order Family of Methods for Finding A Simple Root of Nonlinear Equation,

    Ćebić Dejan, Paunović Marija, Ralević Nebojša (2018)

  • Hydrodynamic model of the open-pit mine “Buvač” (Republic of Srpska)

    Polomčić Dušan, Bajić Dragoljub, Papić Petar, Stojković Jana (2013)

  • 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

  • An Integrated Environment for Management and Exploitation of Linguistic Resources

    Ranka Stanković, Ivan Obradović (2009)
    ... this cod- ing scheme became more and more frequently used. Thus two new systems, Unitex [8] and Nooj [9] were developed, both allowing the processing of texts in Unicode, and subse- quently started to suppress Intex. Although text processing in all three systems is based on dictionaries in LADL ...
    ... stemmer, a program for deleting suffixes and inflectional appendices and reduction to the ‘root’ of the word. This solves the inflectional problem, but only partial- ly and definitely not in a systematic way. In addition to that, the user has no control of the way Google expands the ...
    ... “Improvement of Queries using a Rule Based Procedure for Inflection of Compounds and Phrases”, Polibits, Special section: Natural Language Processing, Journal of Research and Development in Computer Science and Engineering, ed. G. Sidorov (ed.), Centro Innovacion y Desarrollo Tecnologico en Computo ...

  • Different aspects of soft computing methods application for blasting in mining

    Katarina Urošević, Jelena Zakonović, Radmila Gaćina (2019)
    Mining is a global industry that is of great importance for every product which is used by human. For mining, process efficiency, reducing production downtime, increasing profitability are all very important. Soft computing tehnologies (SC) are helping in the process of transforming the mining industry into a safer and more environmental friendly industry, but keeping in mind the financial aspect as well. In this paper some of fields of blasting activities in which the SC methods have been applicated, ...
    soft computing, blasting, fuzzy logic, neural networks

  • The external aggregation Newton's method for solving nonlinear equations and applications

    Marija Paunović, Dejan Ćebić, Nebojša Ralević (2020)
    Њутнов метод, агрегациона функција, ред конвергенције

  • Improving Document Retrieval in Large Domain Specific Textual Databases Using Lexical Resources

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2017)
    Large collections of textual documents represent an example of big data that requires the solution of three basic problems: the representation of documents, the representation of information needs and the matching of the two representations. This paper outlines the introduction of document indexing as a possible solution to document representation. Documents within a large textual database developed for geological projects in the Republic of Serbia for many years were indexed using methods developed within digital humanities: bag-of-words and named ...
    ... hydrogeology and engineering geology, as a modern and efficient information basis for planning, design and decision- making in the geological domain. A u t h o r P r o o f 4 R. Stanković et al. Within the GeolISS project a web portal1 was developed with the aim to pro- vide quicker and easier access ...
    ... ‘Institute for civil engineering Subotica’. The Serbian NER system is a handcrafted rule-based system that relies on comprehensive lexical resources for Serbian. For recognition of some types of named entities, e.g. personal names and locations, e-dictionaries and information within them is crucial; ...
    ... indexing we used only three top level types: personal names, locations and organizations and their distribution is presented in Table 2. Nested NEs were also used for indexing, e.g. toponym Subotica in “Institute for civil engineering Subotica”. 3.2 The Architecture of the New System Indexing of documents ...

  • 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
    ... between CBR„ and the deformation modulus (E,, – E„») and dy- namic deformation modulus (Ey„) values obtained by field tests. Owing to its speed and ease of use, CBR, testing can become widespread as an alternative to the clas- sic method of quality control in the process of compaction and estimation ...
    ... 1. W.Weingart, ]. Hanebutt, and W. Rummert, “Dynamic laboratory and field testing device for determination of the CBR value of mineral concrete,” Die Strasse, 26(2), 48-51 (1990). H. H. Schmidt and J. Volm, “Dynamic CBR test – new method of embankment quality control,” Geotechnik, 25(4), 271-274 ...
    ... construction of the foundation layers of pavements. Control procedures are used to ensure the quality of construction, in accordance with the criteria defined by certain design regulations, specifications, and standards. In addition to compaction control, the basic measure for ensuring the quality of ...

  • Transboundary groundwater resources of Serbia - present status and future needs for sustainable management

    Veljko Marinović, Branislav Petrović, Zoran Stevanović (2021)
    Republic of Serbia is located at the crossroads of Southeast and Central Europe and belongs to the Central Balkans. With its 88,360 km2, Serbia is one of the larger countries of the Balkan Peninsula. It borders 8 countries and has at least one transboundary aquifer (TBA) with each of them. According to evaluation conducted for UNECE in 2008, Serbia has a total of 17 TBAs, out of which 15 are shared with one neighboring country, while two aquifers are shared with two or three ...
    međugranične izdani, Srbija, monitoring podzemnih voda, upravljanje podzemnim vodama

  • Application of Peleg model on mass transfer kinetics during osmotic dehydratation of pear cubes in sucrose solution

    Vesna Pavelkić, Tanja Brdarić, Marija Petrović, Gavrilo Šekularac, Milica Košević, Lato Pezo, Marija Ilić (2015)
    The applicability of Peleg model was investigated for predicting mass transfer kinetics during the osmotic dehydration (OD) process of pears, at different concentrations (40, 60 and 70%, w/w) and temperatures (20, 35 and 50 °C) of sucrose solution. Increase in sucrose solution concentration resulted in higher water loss (WL) and solid gain (SG) values through the osmotic treatment period. After 360 min of osmotic treatment of pears, WL ranged from 23.71 to 31.68% at 20 °C, from 24.80 to ...
    осмотска дехидрација, крушкa, кинетика, температурни ефекат, Пелег модел

  • Phase relations and physical indicators of municipal waste from old landfills in Serbia

    Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić (2021)
    Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...
    municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science
    ... 24-39. 5) Huat, B.K. (2004): Organic and Peat Soils Engineering, Serdang: University Putra Malaysia Press,146. 6) Kaniraj, S.R..Joseph, R.R. (1996):Geotechnical behavior of organic soils of North Sarawak, 4" International Conference on Sofi Soil Engineering, Vancouver, Canada, 267-274. 7) Machado ...
    ... waste, Jourmal of Geotechnical and Geoenvironmental Engineering, ASCE, 132(10), 1250-1261. 6) Zornberg J.G., Jernigan B.L., Sanglerat T.R., Cooley B.H. (1999): Retention of free liquids in landfills undergoing vertical expansion, Jowmmal of Geotechnical — and Geoenvironmental Engineeringč ...
    ... consistency, biodegradability etc. (Vosniakos and Patronic, 2009). Therefore, data on the composition, shape and size of n i Ra5 o — - particles in the landfill can be of great use in defining m:;';]on and selection || > M @523331 the phase composition and physical indicators of iušLte008| Y Horanalysis| ...