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Упит dcterms_subject_txt:method of least squares

2837 items

  • Arsenic in tape waters of the south Pannonian basin (Serbia) and arsenic risk assessment

    Petar Papić, Marina Ćuk, Maja Todorović, Jana Stojković, Bojan Hajdin, Nebojša Atanacković, Dušan Polomčić (2012)
    ... within the territory of Vojvodina were used to perform arsenic con- centration analyses as part of studies conducted by the University of Belgrade, Faculty of Mining and Geology [20], “Geozavod” from Belgrade [21], as well as the Faculty of Natural Sciences of the University of Novi Sad [22]. Total arsenic ...
    ... report of the project: SUDEHSTRA. University of Belgrade, Faculty of Mining and Geology, Department of Hydrogeology, Belgrade, pp. 71-75, 2009. 21. MANDIĆ M., PAPIĆ P. A Contribution to the Understanding of the Qualitative Properties of Groundwater in Vojvodina. Novi Sad: 14th Conference of Geologists ...
    ... layer of varying thickness, which effectively prevents the ingress of oxygen into the aquifer. This, along with large amounts of organic substances deposited in the sediments, has resulted in the creation of a reducing medium where arsenic mobilization is enhanced [18]. Of the total amount of abstracted ...

  • Approach to operational mine planning: Case study Tamnava West

    Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Ranka Stanković (2014)
    ... the realization of profits, are a thing of the past. Successful business in conditions of limited resources is impossible without many analysis of the technical and economic parameters and detailed planning of all possible scenarios of production. Due to availability of the coal resources ...
    ... pit limits, geometry of benches or technology, was not a part of interest for this study, and are simply as it is. 2.1.4. Design of pit benches Design of pit benches is one of the most important and critical phases in mine planning of pit production. It’s a part of long term planning, and ...
    ... project "Improvement of Lignite Opencast Technology in Order to Increase Energy Efficiency and Occupational Safety" (TR 33039) financed by the Ministry of Education and Science of the Republic of Serbia within the framework of Programme of research in the field of technological development for ...

  • Overwiew of In-Pit Crushing & Conveying Technology in Open Pit Mines

    Ali Nasirinezhad, Dejan Stevanović, Dragan Ignjatović, Petar Marković (2021)
    The conditions under which contemporary surface mining operations is carried out obviously becoming increasingly complex. In such complex conditions, the optimization of haulage systems as the technological phase with the largest share in the total operating costs, is very important from the aspect of achieving profitability of the mining project. In a large number of cases, the application of traditional haulage systems with trucks (as the most dominant type of haulage in open pit mines) does not lead to ...
    In Pit Crushing and Conveying, IPCC, open pit mining, haulage, optimization, costs saving

  • Adaptive neuro-fuzzy prediction of operation of the bucket wheel drive based on wear of cutting elements

    Filip Miletić, Predrag D. Jovančić, Milos Milovančević, Dragan Ignjatović (2020)
    The capacity of the rotor excavator depends largely on the operation of the subsystem for digging. There is a great contribution to the correct and sharp teeth when the capacity is the highest. In the function of time, the teeth become clogged due to abrasive wear, or changes in their geometric shape. To analyze the bucket wheel drive in depend on wear of the cutting elements in this study adaptive neuro fuzzy inference system (ANFIS) approach was implemented. ANFIS ...
    Pogon rotornog točka, habanje, rezni elementi, ANFIS

  • Advantages and Disadvantages of a Parallel and Zigzag Method of Acquisition in Walking Mode in Magnetometric Archeological Research

    Mirko Petković, Vesna Cvetkov, Branislav Sretenović (2014)
    магнетометријска испитивања, цик-цак и паралелна аквизиција у ходајућем моду, линеарне аномалије, археологија
    ... resolve the problem of the zigzag method of acquisition by using the instrument’s software. Before the start of the acquisition process, the operator sets the direction and the method of acquisition. The in- strument’s software then prepares the data col- lected in the zigzag method for further computer ...
    ... with this method of measurement, all the data fell within the margins of the test polygon, so the processing step where the data was spatially limited, was omitted. In the fi rst step of processing, the peaks were clipped, i.e., where the gradient value of the TMI was outside the range of ± 70 nT/m ...
    ... direction of acquisition, the data was interpolated using the linear Kriging method and displayed as a gradient map of TMI, with the direction of the acquisition to the North (Figure 9.a.), and to the South (Figure 9.b.). Figure 9 Taking into account the intensity of the verti- cal gradient of the two ...

  • 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
    ... Classification of documents using identifiers Two processing procedures were applied to the documents subject to clas- sification, resulting in two test sets. The control method was to replace the identifiers with their class, a more general hierarchical designation. The ex- perimental method also considered ...
    ... the growth of a set of test documents, its performance further decreases, which was not desirable in solving our task. In this paper, we experiment with a simple classification approach to evaluate the importance of timely management of large amounts of data, as well as the usable value of semantics ...
    ... considered the length of the identifiers, so they were replaced by a certain number of iterations of the parent class depending on their length, to test the assumption that the use of more specialized terms was more important for determining the class of documents. So, instead of reducing the identifiers ...

  • FTIR spectroscopic study оf S-мetolachlor сorption оn inorganic and organically modified montmorillonite from Bogovina

    Lazar Kaluđerović, Zorica Tomić, Jelena Bogosavljević, Ljubomir Životić, Maja Milošević (2021)
    ... phenolin interlayerspace of montmorillonite (Majdan et al., 2009) CONCLUSION FTIR method was very useful in the process of examination of interactions between Na- montmorillonite and organic complexes such as HDTMA bromide and PTMA chloride. 335 SERBIAN SOCIETY OF SOIL SCIENCE Soils for ...
    ... montmorillonite as the dominant mineral, was separated using the decantation method. Clay fraction (< 2 mm) was then treated with 30% hydrogen peroxide in order to remove organic matter from the sample. 330 SERBIAN SOCIETY OF SOIL SCIENCE Soils for Future under Global Challenges After air drying ...
    ... complex. All samples are then treated with 1000 mg/L working solution of S-metolachlor and marked as NaM-SM, 1H-SM, 2H-SM, 3H-SM, 4H-SM, IP-SM, 2P-SM, 3P-SM, and 4P- SM. FTIR spectroscopy All samples were investigated using FTIR method (Fourier-transform infrared spectroscopy). All results were obtained ...

  • FTIR Spectroscopic Study Of S-Metolachlor Sorption On Inorganic And Organically Modified Montmorillonite From Bogovina

    Lazar Kaluđerović, Zorica Tomić, Jelena Bogosavljević, Ljubomir Životić, Maja Milošević (2021)
    ... Serbian Society of Soil Science University of Belgrade, Faculty of Agriculture Supported by: Ministry of Education, Science and Technological Development of the Republic of Serbia Maize Research Institute “Zemun polje”, Belgrade, Serbia Semenarna d.o.o., Niš, Serbia Ministry of Agriculture ...
    ... repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Serbian Society of Soil Science University of Belgrade, Faculty of Agriculture ...
    ... position. The intercalation of HDTMA+ cations into the interlayer space produces redshift of the IR bands that originate from the vibrations of the adsorbed water, as a consequence of the reduction of the hydrogen bond strength in HDTMA-montmorillonite. Also, the intensity of these bands decreases ...

  • The influence of alkyl polyglucosides (and highly ethoxylated alcohol boosters) on the phase behavior of a water/toluene/technical alkyl polyethoxylate microemulsion system

    Marija Ilic, Franz-Hubert Haegel, Vesna Pavelkic, Dragan Zlatanovic, Snezana Nikolic-Mandic, Aleksandar Lolic, Zoran Nedic (2016)
    The influence of additives (alkyl polyglucoside, Glucopon 600 CS UP and alcohol ethoxylate C18E100) on the behavior of the water/toluene/Lutensol ON 50 (technical oxoalcohol, i-C10E5) microemulsion system as a function of temperature and composition has been investigated. The phase behavior of the microemulsions was determined by vertical sections through the Gibbs phase prism (fish-like phase diagrams). Alkyl polyglucoside shifts the one phase region to lower temperatures compared with water/toluene/Lutensol ON 50 mixtures. This is contrary to the expectation, considering ...
    микроемулзија, толуен, алкил полиглукозид, оксоалкохол етоксилат, појачивач ефикасности, „fish“ дијаграми
    ... Serbia “Innovation Center Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia SFaculty of Chemistry, University of Belgrade, Belgrade, Serbia ŠFaculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia SCIENTIFIC PAPER UDC 547.533:66:544 DOI 10.2298/ ...
    ... a 1Fat·:ulty of Mining and Geology, Serbia IBG-3 Agrosph8are, Julich, Germany and Metallurgy, University of Belgrade, Belgrade, Serbia “Innovation Center Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia ŠFaculty of Chemistry, University of Belgrade, Belgrade ...
    ... efficiency of the surfactant [3-10]. Alcohol ethoxylate surfactants are widely used for microemulsion applications. The phase behavior with respect to the length of the hydrocarbon tails and the number of ethylene oxide (EO) units depends on the purity of alcohol ethoxylates. The structure of the ...

  • Synergy between the mineral deposit exploration and geothermal resources assessment on the example of "Valjevo" boron and lithium deposit in Serbia

    Nebojša Atanacković, Vladimir Živanović, Ana Vranješ, Sava Magazinović, Marinko Toljić, Ana Arifović, Branislav Potić (2023)
    Exploration of mineral deposits involves a collection of vast data sets on geological characteristics of the area. These data can largely contribute to the assessment of the geothermal potential, which can lead to an increase in the share of geothermal resources in the energy mix of the extractive industry and the local community. On the example of the "Valjevo" B-Li deposit, data on structural settings and previous hydrogeological investigations were combined with the results of resource drilling and geophysical ...
    Geothermal assessment, Mineral deposit exploration, Geothermal potential, Serbia
    ... es of part of the Triassic carbonate reservoir were estimated at the base of the Neogene sediment sequence and as maximal expected temperatures. The temperatures at the contact of the Triassic reservoir with the Neogene cover are calculated as a product of the values of geothermal gradients of the ...
    ... Exploration of mineral deposits involves a collection of vast data sets on geological characteristics of the area. These data can largely contribute to the assessment of the geothermal potential, which can lead to an increase in the share of geothermal resources in the energy mix of the extractive ...
    ... Modelling of the lithostratigraphy, structural settings and morphology of the basement of the Miocene sediments were conducted based on tectonic analyses of the basin periphery, interpretations of gravimetric and magnetotelluric geophysical research data, drilling core logging and creation of a series ...

  • Structural and geochronological constraints from the Drina-Ivanjica thrust sheet (Western Serbia): implications for the Cretaceous–Paleogene tectonics of the Internal Dinarides

    Kristof Porkoláb, Szilvia Kövér, Zsolt Benkó, Gabor Héja, Melinda Fialowski, Balázs Soós, Nataša Gerzina Spajić, Nevenka Đerić, László Fodor (2019)
    Internal Dinarides, Drina-Ivanjica thrust sheet, Deformation history, K–Ar dating, Obduction, Structural analysis
    ... determine the timing of metamorphism and deformation, the K/Ar method was applied. Experiments were carried out on both 1 and 2 m fractions of illite in order to constrain the fraction size-dependence of the results. The separated size fractions were analyzed by the K-Ar method (Balogh 1985) in ...
    ... the illite “crystallinity” method introduced by Kiibler (1966, 1968), based on X-ray powder diffraction (XRPD). This work presents Kiibler Indices (KI) data in order to characterize the metamorphic grade of different formations. X-ray diffraction (XRD) measurements of the clay fraction (< 2 ...
    ... metasedimentary rocks, which complicates the interpreta- tion. Being aware of these characteristics of illite formation and the related K/Ar system, it is highly advantageous to apply the IIlite Crystallinity and K/Ar method together on the same samples, coupled with a microstructural characterization ...

  • 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
    ... Energy is essential to economic and social development of each community and improved quality of life of citizens. Energy demand in the world has a constant growth, which is driven by increased number of inhabitants and growth of life standard 1. Much of the world's energy is currently produced and consumed ...
    ... emissions of greenhouse and other gases and substances leads to the necessity of improving efficiency in energy production, transmission, distribution and consumption in the at the global level, or level of the country, region etc 4.  Nowadays the most of attention of is dedicated to reduction of carbon ...
    ... combustion indicates that about 60% of annual carbon dioxide emission in is a consequence of electricity generation in TPPs. Bearing in mind low efficiency of plants and the feeding fuel-lignite, in average 1kg of carbon dioxide is emitted during production of 1kWh of electricity in TPPs. Figure 5. Carbon ...

  • Development of Open Educational Resources (OER) for Natural Language Processing

    Cvetana Krstev, Biljana Lazić, Ranka Stanković, Giovanni Schiuma, Miladin Kotorčević (2015)
    In this paper we present the development of an online course at the edX BAEKTEL platform named “Lexical Recognition in the Natural Language Processing (NLP)”. It is based on the course of the same name for PhD studies at the University of Belgrade, Faculty of Philology. There are not many courses in Computational Linguistics (CL) on OER platforms, and there is none in Serbian either for CL or NLP. We have developed this course in order to improve this ...
    E-Learning, Open Educational Resources, Computational Linguistics, Lexical Resources, edX
    ... overview of the field of CL/NLP is given in section 2 of this paper. In order to complement a lack of OER in Serbia we have decided to develop the OER course “Lexical Recognition in the Natural Language Processing (NLP)”. This course is offered at the University of Belgrade, Faculty of Philology ...
    ... first courses at University of Belgrade were introduced in 1994: in Mathematical and CL for students of General Linguistics and students of Serbian language at the Faculty of Philology, as well as NLP graduate courses for students of Mathematics at the Faculty of Mathematics. Over the last ...
    ... September 2015, Belgrade, Serbia DEVELOPMENT OF OPEN EDUCATIONAL RESOURCE (OER) FOR NATURAL LANGUAGE PROCESSING CVETANA KRSTEV University of Belgrade, Faculty of Philology, cvetana@poincare.matf.bg.ac.rs BILJANA LAZIĆ University of Belgrade, Faculty of Mining and Geology, biljana.lazic@rgf.bg.ac ...

  • Numerical modelling of the roughly simultaneous emplacement of two distinct ophiolite belts

    Nikola Stanković, Vesna Cvetkov, Vladica Cvetković (2024)

  • Towards a Mining Equipment Ontology

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... contains a template of the classes used for different types of data search, domain control, selection of domain elements, and implementation of hierarchical data structures in the form of trees. The business logic of the system is implemented in four libraries, two of which are of a general type, and ...
    ... n system itself is a result of several phases of software development during the long-term research of the problem of coal quality management. The first versions of the software related to the problem of coal homogenization was developed in 1998, whereas the essence of the SUKU system as it is now ...
    ... Serbian as one of the languages) in the area of mining engineering was initiated several years ago. One of the first taxonomies in this field was developed at the University of Belgrade Faculty of Mining and Geology (FMG), for bucket wheel excavators, within a project aimed at assessment of excavator ...

  • Life Cycle Assessment of Individual Wood Biomass Heating Systems in Households

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    The use of solid fuels (wood biomass and coal) for heating of households continues to be common practice within European countries. Solid fuel combustion in households contributes more than 46% to total emissions of fine particulate matter. In this study, a life-cycle assessment (LCA) of firewood-based and pellet-based heating systems is performed. These two systems represent two different types of individual wood biomass heating systems. In the case of the firewood-based heating systems, it is analyzed a typical stove ...
    Grejanje, Analiza životnog ciklusa, Drvna biomasa, Individualni sistemi grejanja
    ... same time, it ensures the financial benefits through savings and conservation of natural resources. This research showed that the implementation of LCA for assessing heating systems is an efficient and relatively simple method for obtaining new information regarding the household heating sector. Key ...
    ... continual improvement of its environmental performance. Boban Pavlović, Dejan Ivezić. Marija Živković 430 However, since LCA considers the environmental aspects and the potential impacts of a product or a service system throughout its life, it becomes a very useful method for researching studies ...
    ... assessment (LCA) is considered as an effective method to evaluate the greenhouse gas (GHG) emissions of a particular HS throughout its lifetime [9]. In this paper, it is implemented the Global Warming Potential (GWP) as an impact assessment method. All aggregated GHG emissions are converted to ...

  • Application of Expansive Mortars for the Formation of Artificial Screens During Blasting in Urban Areas

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Nikola Simić, Jelena Majstorović (2024)
    During construction of buildings in urban areas, sometimes there is a need to blast solid rock mass in the immediate vicinity of the surrounding buildings. In that case, the aim is not only to increase the efficiency of blasting, but also to reduce harmful effects of ground vibration induced by blasting. At the same time, it is very important to protect the buildings located in the safe zone from the blast site as well as remaining rock mass around ...
    expansive mortar, artificial screens, pressure, rock breaking, building foundation

  • Gate Road Support Deformation Forecasting Based on Multivariate Singular Spectrum Analysis and Fuzzy Time Series

    Luka Crnogorac, Rade Tokalić, Zoran Gligorić, Aleksandar Milutinović, Suzana Lutovac, Aleksandar Ganić (2021)
    Underground mining engineers and planners in our country are faced with extremely difficult working conditions and a continuous shortage of money. Production disruptions are frequent and can sometimes last more than a week. During this time, gate road support is additionally exposed to rock stress and the result is its progressive deformation and the loss of functionality of gate roads. In such an environment, it is necessary to develop a low-cost methodology to maintain a gate road support system. ...
    deformacije podgrade, lasersko skeniranje, višekanalna singularna spektralna analiza, prognoza, klasterisanje fuzzy vremenskih serija
    ... process of measuring the cross-section of the underground roadways, certain measurement errors can occur (conditioned by the error of the measurement method, instrumental error, personal error by the operator of the instrument, or the error due to the working environment itself), the nature of fuzzy time ...
    ... process of measuring the cross-section of the underground roadways, certain measurement errors can occur (conditioned by the error of the measurement method, instrumental error, personal error by the operator of the instrument, or the error due to the working environment itself), the nature of fuzzy time ...
    ... duration time and costs of reparation with respect to forecasted deforma- tions. Future research will be focused on carrying an in situ measuring of the deformations in an underground mine to quantify the quality of the method. Furthermore, the focus will be on the making of a 3-D model of gate road support ...

  • The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers

    Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović (2019)
    One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...
    open-cast coal mine, auxiliary works, bulldozers, optimization, availability
    ... Cost Capital Cost vW Time of Use Figure 3. The economic life of the machine, based on the minimal cost method (1) Hourly ownership costs and operational costs for dozer could vary significantly. Parameters impacting these costs are: type of job performed, costs of fuel and lubricants, transportation ...
    ... recommended method for evaluation of hourly ownership and operational costs, including data on auxiliary machines (Caterpillar and Komatsu methods). Integration of this information with operational conditions will enable reliable evaluation. Total costs, i.e. specific cost per moto hour is the sum of following ...
    ... rockbolting application in mines for the purpose of increasing work safety and production efficiency” (TR 33025), financed by the Ministry of Education and Science of the Republic of Serbia within the framework of Programme of research in the field of technological development for the period 2011-2019 ...

  • Influence of Initial Treatment on the Survival and Recurrence in Patients With Differentiated Thyroid Microcarcinoma

    Jasna Mihailović, Ljubomir Stefanović, Ranka Stanković (2013)
    ... used to analyze variables. The Kaplan-Meier method and log-rank test were used to calculate time-dependent variables using statistical software SPSS version 8 (SPSS Inc, Chicago, IL). Avalue of P G 0.05 was considered to be significant. RESULTS A summary of the patients’ characteristics including demo- ...
    ... *Department of Nuclear Medicine, Oncology Institute of Vojvodina, Sremska Kamenica & University of Novi Sad, Technical Faculty ‘‘Mihajlo Pupin’’, Zrenjanin; †Department of Nuclear Medicine, Oncology Institute of Vojvodina, Sremska Kamenica-retired; and ‡Faculty of Mining and Geology, University of Belgrade ...
    ... a median follow-up of 10 years. Total/near-total thyroidectomy was performed in 121 (93.1%) of 130 patients, followed with 131I ablation in 71 (54.6%) of 130 patients. Results: The probability of disease-specific survival was 97.7% T 1.3% after 5 and 10 years; the probability of disease-specific survival ...