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Упит dcterms_subject_txt:top-down method

509 items

  • Groundwater resources for drinking water supply in Serbia´s Southeast Pannonian basin

    Dušan Polomčić, Bojan Hajdin, Marina Ćuk, Petar Papić, Zoran Stevanović (2014)
    menadžment podzemnih voda, monitoring, kvalitet podzemnih voda, bilans, baza podataka

  • Spatial assessment of the areas sensitive to degradation in the rural area of the municipality Čukarica

    Natalija Momirović, Ratko Kadović, Veljko Perović, Miloš Marjanović, Aleksandar Baumgertel (2019)
    Nature and Landscape Conservation, Soil Science, Agronomy and Crop Science, Water Science and Technology

  • 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
    ... spectrum analysis) algorithm was presented. Hassani and Zhigljavsky [13] showed that SSA is a powerful method for time-series analysis and forecasting. Hassani and Mahmoud- vand [14] pointed out that this method can be applied both to single series and jointly for several series (MSSA). When it is a case of ...
    ... future states of support deformation. Ding-Ping Xu et al. [1] compared the predictions from the rock–soil composite material model, where an analytic method, along with existing data from physical model tests, was applied to acquire results. Good consistency, both in terms of strength and failure Energies ...
    ... future states of support deformation. Ding-Ping Xu et al. [1] compared the predictions from the rock-soil composite material model, where an analytic method, along with existing data from physical model tests, was applied to acquire results. Good consistency, both in terms of strength and failure Energies ...

  • 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

  • Identification of the Best Available Renewable Energy Source for Electricity Production in Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    Around 2/3 of electricity production in Serbia originates from coal-fired thermal power plants. The most significant domestic coal deposits are lignite deposits, a type of low -quality coal that causes negative health, climate and environmental impacts during the combustion. To reduce those negative impacts on domestic electricity production and to promote environmental awareness, the Serbian Energy Sector Development Strategy and the National Action Plan for Use of Renewable Energy Sources indicate the plan for increasing the share of ...
    Strategija obnovljive energije, Održiva energija, Proizvodnja električne energije, Solarna energija, Biomasa, Hidroenergije, Energija vetra

  • Replica of the “Great Triangle Gold Nugget” Belonging to Belgrade University Collection, Gilded or Not?

    Alena Zdravković, Maja Milošević, Ivana Jelić (2021)
    ... surface. Since the gold colour and shine remained the same, did not darken by the time it was assumed that the model is gilded. Material and method Chemical composition of the gypsum model surface was carried out in the Laboratory for SEM, Faculty of Mining and Geology, University of Belgrade ...

  • 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)
    ... calcite grains, which is consistent with the previously reported data (MILOŠEVIĆ et al., 2019). Sample 1 was prepared by the traditional coiling method on a hand rotated wheel, while sample 2 was made with the application of a modern mould technique. A microscopic examination of the thin sections ...

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

    Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić (2023)
    ... O. Box 522, 11001 Belgrade, Serbia Nanostructured CaosSEro.,MnOx was synthesized by the sucrose-nitrate procedure (SNP). During this combustion method, sucrose Ci.H»Ori which is both fuel and complexant and metal ions in the form of calcium nitrate tetrahydrate, manganese(II) nitrate hydrate, e ...

  • Процјена хазарда и ризика од клизишта за различите нивое просторног планирања у Републици Српској, БиХ

    Цвјетко С. Сандић (2022)
    Територија Републике Српске је у посљедних десетак година веома угрожена активирањем нових и реактивирањем старих клизишта. Она својим дјеловањем наносе огромне материјалне штете, па и људске жртве, те је неопходно озбиљније третирање и дјеловање у борби са овим природним хазардом. Чест проблем јесте одговорност, тј. надлежност институција из ове области и недостатак у законској регулативи која готово никако или само површно обрађује област хазарда и ризика од клизишта. Усљед непостојања праксе и усвојених методологија које су у примјени у свијету, циљ ...
    Kлизишта, склоност, хазард, ризик, процјена, просторно планирање, угроженост

  • Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

    Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović (2021)
    sagorevanje lignita, otpadna šljaka, zamena cementa, proizvodnja maltera i betona, fizičko-mehanička i fizičko-hemijska karakterizacija
    ... using the Abrams cone slump method. The density of fresh concrete was determined according to standard EN 12350-6, in a metal, cylindrical vessel with a capacity of 8 dm3. Air content in fresh concrete was determined according to standard EN 12350-7 by using the pressure method. For testing, an apparatus ...
    ... is no planned waste disposal, in order to get a more realistic picture in terms of the quality of waste material, samples were taken by the square method from different places so that material of different ages was included. After sampling, the samples were mixed, homogenized and the required amount ...
    ... to a decrease in the Minerals 2021, 11, 925 10 of 16 absorption coefficient due to capillary water absorption. However, regardless of the test method, the maximum difference in water absorption values was up to 15%. Based on the shrinkage measurements results due to the drying of cement mortars ...

  • 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
    ... 6191 || level of groundwater rising Fig.7 a The position of Dark Gate and the direction of water draining from slope; b directions of water moving down slope and rising from the ground Linear damage index - Dl,„ 82007 02014 quantifiable evidence that the eastern side is more damaged due to ...
    ... rather than the sum of its individual parts (Smith and Prikry1 2007; McCabe et al. 2007). In the field of stone conservation, monument mapping method is generally accepted as an essential part of con- dition survey, being cost-effective and non-destructive procedure that provides comprehensive ...
    ... rarely afford- able in less developed countries and hardly cost-effective for more “commonplace” built heritage. A comprehensive monument mapping method devel- oped by the working group 'Natural stones and weathering"/ Aachen University of Technology (Fitzner et al. 1995, 1997a, b) is cost-effective ...

  • Advancing Sentiment Analysis in Serbian Literature: A Zero and Few-Shot Learning Approach Using the Mistral Model

    Milica Ikonić Nešić, Saša Petalinkar, Mihailo Škorić, Ranka Stanković, Biljana Rujević (2024)
    Ova studija predstavlja analizu sentimenta srpskih starih romana iz perioda 1840-1920, koristeći veliki jezički model (LLM) Mistral za tehniku učenja sa zasnovani na takozvanim "zero" i "few-shot" pokušajima. Glavni pristup uvodi inovacije osmišljavanjem istraživačkih upita (promptova) uključuju tekst sa uputstvom za klasifikaciju bez primera i na osnovu nekoliko primera, omogućavajući jezičkom modelu da klasifikuje osećanja u pozitivne, negativne ili objektivne kategorije. Ova metodologija ima za cilj da pojednostavi analizu osećanja ograničavanjem odgovora, čime se povećava preciznost ...
    zero-shot, few-shot, sentiment, Serbian, Mistral model

  • Linear-motor plunger pump increases lifting efficiency

    Bojan Martinović, Dušan Đekić, Dušan Danilović, Pavel Isaev (2022)
    plunger, linear, motor, pumps

  • Optimisation of underground mine decline development system using genetic algorithm

    Zoran Gligorić, Aleksandar Ganić, Rade Tokalić, Aleksandar Milutinović (2014)
    ... 519 1,500 260 878.38 4.5 down SBP-UMCP 519 1,500 260 1,648 984 177 1,244.10 6.6 down UMCP-Ore body A 1,648 984 177 1,160 1,229 200 546.53 4.2 up UMCP-Ore body B 1,648 984 177 1,556 1,072 160 128.44 13.3 down UMCP-Ore body C 1,648 984 177 1,474 653 130 376.89 12.5 down UMCP-Ore body D 1,648 984 ...
    ... 984 177 919 733 100 774.84 9.9 down Value of the total cost function is 13,581,387 USD. 5. CONCLUSION In this paper we have presented the application of Genetic algorithm for designing underground mine decline development system in the case when the deposit is composed of few ...
    ... tool called Decline Optimization Toll (DOT). The heuristic methods used in DOT1 are replaced in the new version of the software tool, DOT2, by a method based on an understanding of exact solutions to a constrained 3-dimensional path problem. Their approach is based on the minimization of the cost ...

  • 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
    ... Total Cost i i Operations and Maintenance 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 ...
    ... performed, costs of fuel and lubricants, transportation cost from manufacturer, interest rates, etc. Analysis was performed according to recommended method for evaluation of hourly ownership and operational costs, including data on auxiliary machines (Caterpillar and Komatsu methods). Integration of this information ...

  • Mineralogical Discrimination between Authentic and Recent Imitations of Pottery Manufacture in Zlakusa, Serbia

    Maja Milošević, Mihovil Logar, Biljana Đorđević (2021)
    ... illite minerals with quartz, feldspars and smaller amounts of goethite present as non-clay minerals. A total of three vessels were analysed, broken down by type of workmanship: coiling technique (traditional handmade clay pot made by coiling on a hand-turned wheel) marked -1-; wheel throwing (on ...
    ... according to CIE (1931) based on diffuse reflectance spectra recorded on a CCS200 spectrophotometer (Thorlabs) in the 380 - 1000 nm range. A standard method was used to determine the water absorption of the investigated shreds of pottery (SRPS ISO 10545-3) reduced to the same dimensions. Based ...

  • Mineralogical and physicochemical characterization of bentonite clay from Svrljig, Serbia

    Maja Milošević, Bojan Kostić (2022)
    ... analysis (DTA) and X-ray diffrac- tion (powder, oriented, saturated and heated). The physical properties were determined by granulometry (pipette method), cation exchange capacity (CEC) and specific surface area (SSA) measurements. The sample consists mostly of a fraction <1 μm (56.1%) with a 9.5% ...

  • 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

  • Ефикасност дистрибуције и коришћења природног гаса у домаћинствима

    Dejan Brkić (2010-03-30)
    Природни гас ће се у будућности све више користити као енергент за подмиривање грејних потреба становништва у српским градовима. Стога је потребно изнаћи најповољнији начин употребе природног гаса. Природни гас се може користити за подмирење грејних потреба становништва на два дијаметрално супростављена начина, и то директно, тако што би се гас директно уводио у зграде путем дистрибутивног система за снабдевање гасом и затим сагоревао у гасном котлу којим је сваки стан опремљен (гасни дистрибутивни систем), или индиректно, тако што ...
    prirоdni gаs, distribuciја gаsа,grејаnjе, cеvоvоdi, cеvоvоdnе mrеžе,fаktоr trеnjа pri prоtоku fluidа,urbаnizаm
    ... s. Hardy Cross  developed a numerical method for calculating flow and pressure distribution  in a  looped network. This  method also has been widely used  in modeling of waterworks with  ring‐like  structures of  conduits  in  municipalities. Hardy Cross method assumes equilibrium between pressure a ...
    ... Hardy  Cross  method  is one approach  to  solve  the  loop equations. Original method  first determines  corrections  for  each  loop  independently  and  applies  this  correction  to  compute  new  flow  in  each  conduit.  It  is  not  efficient  compared  to  improved  Hardy  Cross  method  that  considers  ...
    ... Simultaneous  method  is  used  by  Epp  and  Fowler,  but  only  for  looped  waterworks  systems.  Some  methods developed by Russian authors are similar with original Hardy Cross method. Contemporary with  Hardy Cross, soviet author V.G. Lobachev was being developed very similar method compared to original  ...

  • Ефикасност дистрибуције и коришћења природног гаса у домаћинствима

    Dejan Brkić (2010-03-30)
    Природни гас ће се у будућности све више користити као енергент за подмиривање грејних потреба становништва у српским градовима. Стога је потребно изнаћи најповољнији начин употребе природног гаса. Природни гас се може користити за подмирење грејних потреба становништва на два дијаметрално супростављена начина, и то директно, тако што би се гас директно уводио у зграде путем дистрибутивног система за снабдевање гасом и затим сагоревао у гасном котлу којим је сваки стан опремљен (гасни дистрибутивни систем), или индиректно, тако што ...
    prirоdni gаs, distribuciја gаsа,grејаnjе, cеvоvоdi, cеvоvоdnе mrеžе,fаktоr trеnjа pri prоtоku fluidа,urbаnizаm
    ... s. Hardy Cross  developed a numerical method for calculating flow and pressure distribution  in a  looped network. This  method also has been widely used  in modeling of waterworks with  ring‐like  structures of  conduits  in  municipalities. Hardy Cross method assumes equilibrium between pressure a ...
    ... Hardy  Cross  method  is one approach  to  solve  the  loop equations. Original method  first determines  corrections  for  each  loop  independently  and  applies  this  correction  to  compute  new  flow  in  each  conduit.  It  is  not  efficient  compared  to  improved  Hardy  Cross  method  that  considers  ...
    ... Simultaneous  method  is  used  by  Epp  and  Fowler,  but  only  for  looped  waterworks  systems.  Some  methods developed by Russian authors are similar with original Hardy Cross method. Contemporary with  Hardy Cross, soviet author V.G. Lobachev was being developed very similar method compared to original  ...