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Упит dcterms_subject_txt:quality of service

2836 items

  • Mineragenetske karakteristike i potencijalnostjuvelirskih mineralnih resursa leckog vulkanskog kompleksa

    Zoran Ž. Miladinović (2012-12-11)
    Jedan od najznačajnijih regiona u Srbiji, sa stanovišta potencijalnosti juvelirskih mneralnih resursa, predstavlja lecki vulkanski kompleks, tercijarne starosti i dominantno andezitskog sastava. Ovaj vulkanski kompleks površine preko 700km2 nalazi se u južnojSrbiji na prostoru imeđu Kuršumlije, Lebana i Medveđe.Prvi su pažnju na juvelirske mineralne sirovine ovog prostora obratili graditeljiJustinijane Prima-e (VI vek). Najintenzivnija istraživanja izvršena su u periodu 1980–1982. ali samo na malom prostoru krajnjeg jugoistočnog dela vulkanskog kompleksa.U Leckom vulkanskom kompleksu dominiraju andezitske stene i njihovi piroklastiti.Smatra se ...
    vulkanski kompleks, mineragenetske karakteristike, juvelirski mineralni resursi, nalazišta, potencijalnost, kvarc, ametist, ahat, kalcedon, jaspis, prognoza
    ... measurements. The quality of the gemstone raw material is verified through lapidary processing (gemstone cutting) and the production of jewelry. It has been established that the most adequate use of raw material is by using en cabochon cut, gliptography and mixed cut. The quality of the gemstone raw ...
    ... varieties of gem-quality from southern Apuseni mountains (Romania), Acta Mineralogica-Petrographica, Abstract Series 1, Szeged, 2003, p. 21. Constantina C., Moxon T., Agates from Gurasada, Southern Apuseni Mountains, Romania: an XRD and thermogravimetric study, Carpathian Journal of Earth and ...
    ... : Geološki sastav, tektonska struktura i metalogenija leckog masiva. Geology, tectonics and metallogeny of Lece massif, Rasprave Zavoda za geološka i geofizička istraživanja, Memoires du service geologique et geofisique, Rasprava XIV, Vol. XIV, 59 str., Beograd. Петров В. П, 1969, Закономерности ...

  • Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes

    Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović (2016)
    menadžment, rudrastvo i energetski kompleksi, okruženje, održivi razvoj, mrežno planiranje
    ... terms of consequences of operational activities of mining and energy complexes, is analyzed based on the function of probability of a risk event and the measurement of potential degradation of environmental quality. Risk events, i.e., operational activities that could affect the degradation of air, water ...
    ... impact of mining and energy complex on the air quality is assessed on the basis of the reports of accredited laboratories (Mining Institute in Belgrade) and annual reports on the state of air quality in the Republic of Serbia (Environmental Protection Agency). Automatic monitoring of air quality in the ...
    ... environmental quality (A1) was given a score of 3 because of the probability of exceeding the limit values and the degree of impact that indicates a significant deterioration in the quality of the environment (score 2). Disposal of wastewater and process water (A2); taking up large areas of land (A3); ...

  • 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

  • Availability as a dimension of energy security in the Republic of Serbia

    Boban Pavlović, Dejan Ivezić (2016)
    There is a range of modern approaches and models in literature for the evaluation and determination of energy security, which are based on different parameters and indicators. For most of them, a common characteristic is emphasizing the avail ability of energy, as an important dimension for ensuring energy security. In this paper, concise overview of Serbian energy sectors is given and appropriate energy indicators are defined and determined. Selected indicators provide insight into the main components that characterize availability ...
    raspoloživost energije, energetski indikatori, energetska bezbednost
    ... energy security Introduction The increase of world population, along with the growth of quality of life, certain- ly leads to increasing demand for energy. Consumers around the world are facing with the problem of security of supply, volatility of energy prices, environmental degradation caused ...
    ... consumption for the same quality of goods or services, has positive effect to SOS and SS. Increase of RES using for electricity and heat production im- proves SOS decreasing the import dependency, with significant introduction of contemporary technologies and wider applications of different energy sources ...
    ... infrastructure and facilities, as well as improvement of existing one, can only bring benefits in terms of security and quality of life to the whole society. References [1] Ren, J., Sovacool, B. K., Quantifying, Measuring, and Strategizing Energy Security: Determining the Most Meaningful Dimensions and ...

  • Assessments of effects of implementation of strategic plans for development of Belgrade District heating system

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić (2020)
    The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...
    Daljinsko grejanje, LEAP, Primarni energetski faktor, Uvozna zavisnost, CO2 emisija

  • Application of VIКOR method in the selection of an optimal splution of excavation “Borska Reka” ore deposit

    Sanja Bajić, Dragoljub Bajić, Branko Glušćević, Radmila Gaćina (2023)

  • Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)

    Nevenka Novaković, Predrag Dabić, Vesna Matović (2023)
    Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...
    Raspadanje, Indeks oštećenja, Zatrpavanje, Fizička svojstva, Kersantit

  • Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of “Podbracan”

    Aleksandar Milutinović, Aleksandar Ganić, Thamer Rayes Diyab, Rade Tokalić, Meri Ganić (2015)
    ... and that while carrying out of those operations, one must not strictly look at the alignment of instrument and signal, due to the fact that the lengths of sides are short, but one must also look at the quality of measurement of the instru- ment height and altitude of signal. 8. Acknowledgement ...
    ... FACULTY OF MINING AND GEOLOGY. The main mining project for under- ground mining of bauxite reserves remainingin the deposit "Podbracan". Belgrade: 2008. [In Serbian] THE GOVERNMENT OF THE REPUBLIC OF SERBIA. Rulebook on the method for executing of mine surveying. Of�cialGazette of the Republic of Serbia ...
    ... during the pre-project and project stage of mining, as well as during the construction of mining facilities and excavation of mineral resources. Speci�c features of the project concerning excavation of the remaining reserves of bauxite in the deposit of "Podbracan", and in this way the forthcoming mining ...

  • Non-Detonating Chemical Mixture for Non-Invasive Methods of Rock Breaking

    Lazar Kričak, Milanka Negovanović, Nikola Simić, Stefan Milanović (2024)
    Within the Innovation developed several different non-detonating chemical mixtures for non-invasive methods of rock breaking. Laboratory and polygon tests gave the satisfactory results and knowledge enough to start the practical experiments in the field. The basis of this innovation is a theoretical assumption that certain chemical mixtures release a large quantity of gases during combustion. If these gases are found in the enclosed space a growing pressure on the walls of the chamber in which combustion takes place will ...
    non-detonating, chemical mixture, rock breaking, borehole pressure

  • Adsorption and degradation of some psychiatric drugs by sol-gel synthesized titania-based photocatalysts: influence of tungsten and sodium content

    Nina L. Finčur, Maja J. Šćepanović, Mirjana Grujić-Brojčin, Biljana F. Abramović, Jugoslav B. Krstić, Aleksandar Kremenović, Tatjana Srećković, Aleksandar Golubović (2019)
    Mesoporous anatase nanopowders were doped with 0.05−0.5 mol% of W6, in order to obtain more efficient photocatalyst than TiO2 Degussa P25 in the degradation of amitriptyline (AMI) under simulated solar irradiation (SSI). Dominant XRPD peaks were ascribed to anatase phase, with additional peaks which could correspond to brookite, TiO2 bronze and sodium titanate, Na2Ti9O19. The Raman scattering measurements have confirmed anatase as dominant phase, with broad Raman feature at ~270 cm−1 possibly related to Ti–O–Na stretching vibration. All W-doped ...
    Sol-gel synthesis, Doped titania nanopowders, XRPD, Raman spectroscopy, Adsorption and photocatalytic degradation, Psychiatric drugs

  • The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia

    Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić (2019)
    For the purpose of the facilities construction within the transfer station „Prelici“ in Cacak, specific geotechnical investigations were carried out based on which the technological project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the ...
    landfill, geotechnical investigations, transfer station
    ... exception of a stimulating effect (feeling of quality living) can lead to a reduction in the costs of waste collection. On the example of this landfill in Cacak, it has been shown that a very important role in the arrangement of facilities with accompanying equipment has the results of geotechnical ...
    ... operating costs. From the aspect of local self-government, the way of waste treatment is being improved, a certain number of workers of lower social status are employed and a positive economic effect is achieved. From a citizen's perspective, the introduction of a quality organization into the waste ...
    ... press-containers, most of the manipulative plateau, part of the waste disposal boxes, the waste selection hall, the whole recycling yard) are directly dependent on the characteristics of waste in this part of the landfill. It is well known, however, that waste is a very poor quality primarily due to: ...

  • Control of substructure construction of railways in the Republic of Serbia

    Dragan Lukić, Dragoslav Rakić, Irena Basarić Ikodinović (2022)
    Контрола збијености природног тла (у ископу) или збијеног у насипу при изградњи саобраћајница представља један од основних облика контроле квалитета доњег строја. Код изградње брзих саобраћајница (аутопутеви и брза железница) приоритет је постизање високог нивоа контроле извршених радова. У циљу онемогућавања диференцијалног слегања (при изградњи насипа), или промене запремине услед допунског збијања материјала, које неминовно доводе до деформација, потребно је извршити оптимално збијање материјала. У оквиру овог рада приказује се техничка регулатива која регулише контролу збијености при изградњи железничке ...
    доњи строј, техничка регулатива, насип, збијеност, контрола
    ... basaric@rgf.bg.ac.rs CONTROL OF SUBSTRUCTURE CONSTRUCTION OF RAILWAYS IN THE REPUBLIC OF SERBIA Abstract Control of compaction of natural soil (in excavation) or compacted in the embankment during the construction of roads is one of the basic forms of quality control of the substructure. When building ...
    ... experiment with base plate Ø300 mm. Technical conditions for the quality of the material installed in the layers of the substructure in terms of the value of the degree of compaction Rc*, ie the size of the deformation modulus Ev2, are determined by the standard SRPS U.E1.010 and SRPS U.B1.047. When building ...
    ... RS", NO. 100/2012) These Regulations define the minimum quality requirements for materials installed in the layers of the substructure. The minimum requirements are prescribed by the values of the degree of compaction Rc*, ie the values of the deformability modulus Ev2 whose definition is contained ...

  • Determination of Mechanical Properties of Altered Dacite by Laboratory Methods

    Veljko Rupar, Vladimir Čebašek, Vladimir Milisavljević, Dejan Stevanović, Nikola Živanović (2021)
    This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact ...
    Geology, Geotechnical Engineering, Engineering Geology
    ... according to the procedure proposed by Tziallas et al. [1]. Cylindrical samples, 54 mm in diameter, of rock material were extracted by a high-quality laboratory coring machine with a diamond bit. The ends of the specimens and discs were then cut, polished, and shaped to the required height and diameter ratio ...
    ... length of 535 m, and the average depth per borehole was 133 m [11]. 3. Methodology of Laboratory Tests of Strength Parameters of Heterogeneous Rock Mass Laboratory tests of UCS and triaxial test were performed on samples of homogeneous material and composite samples, for which formation blocks of undisturbed ...
    ... followed by a zone of altered dacite. The zone of altered dacite (AD) is yellowish due to the pronounced limonitization of biotite. After the altered dacite, there is compact dacite (D) of gray color, porphyry structure with pronounced large phenocrysts of feldspar. Precise determination of the boundary between ...

  • Definition of criteria and alternatives for choosing the optimal mining method deposits when applying multi: Criteria optimization, Belgrade, June 2024

    Sanja Bajić, Dragoljub Bajić, Branko Gluščević, Radmila Gaćina, Josip Išek (2024)
    multi-criteria decision-making, definition of criteria, underground exploitation

  • Synthesis, characterization and photocatalytic examination of Co0.9Ho0.1MoO4 nanopowders

    Milena Rosić, Maja Milošević, Maria Čebela, Vladimir Dodevski, Vesna Lojpur, Radomir Ljupković, Aleksandra Zarubica (2023)
    ... I), University of Belgrade Institute of Physics, University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions "CEXTREME LAB” - Institute of Nuclear Sciences "Vinča”, University of Belgrade Faculty of Mechanical Engineering ...
    ... Institute of Nuclear Sciences *Vinča”, University of Belgrade Faculty of Mechanical Engineering, University of Belgrade Center of Excellence for Green Technologies, Institute for Multidisciplinary Research, University of Belgrade Faculty of Technology and Metallurgy, University of Belgrade ...
    ... University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions “ĆCEXTREME LAB” – Institute of Nuclear Sciences “Vinča”, University of Belgrade Faculty of Mechanical Engineering, University of Belgrade Center of Excellence ...

  • Business Models for Small-scale Biomass Projects Development

    Dejan Ivezić, Miodrag Gluščević, Marija Živković (2019)
    Biomass is recognized as the most promising renewable energy source in Serbia. The share of biomass in Serbian final energy consumption is over 10%, but mostly related to traditional use in stoves and ovens. One of the main obstacles for wider implementation of contemporary biomass facilities is the inexperience of consumers and stakeholders in the implementation of “innovative” business models, especially in the cases of small-scale projects. In this paper, three different business models (public utility company, energy cooperative ...
    ... in each of the presented models are presented. 1. Introduction The total technical potential of biomass was estimated in the Energy Sector Development Strategy of the Republic of Serbia to 3.448 million toe [1]. Energy balance of the Republic of Serbia for 2017 [2] shows that the share of wood fuels ...
    ... no examples of good practice that could be replicated. Into the framework of H2020 BioVill project [3] an attempt for development of small-scale biomass project in the village of Kostojevići (in the municipality of Bajina Bašta) was done. The project aim was the promotion of the concept of “bioenergy ...
    ... replacement of heat source, this project is optimal for implementation of public private partnership - implementation of ESCO business model. In addition, for realization of this project it is possible to get a subsidy from the Public Investment Management Office of the Government of the Republic of Serbia ...

  • 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
    ... (excavation of exploration pit at the landfili with measurement of volume and weight of excavated waste), measurements on samples from exploration boreholes, geodetic surveying of geometry and calculation of landfill volume with knowing the mass of disposed waste, nuclear methods, measuring of mass ...
    ... soil, determination of physical parameters of municipal waste is more complex, because of its extremely heterogeneous composition, consistency, biodegradability etc. In addition, physical properties of waste change over time, so the method of taking and selection of representative samples is problematic ...
    ... determination of municipal waste unit weight. Those assumptions are: knowledge of waste composition, percentage of ecarth overlay, moisture, method and degree of compaction, waste age etc. (Rakić et al..2016). Due to similarity of municipal waste and soil, for the determination of unit weighh ...

  • 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
    ... repeating of cycles of dissolve, wetting-drying and freeze-thaw caused continual increas- ing intensities of decay and very heavy damage in different forms of loss of stone materials (surface recession, relief, and outburst). The present state of the gate is result of the complex action of the ...
    ... rising velocity of decay pro- cesses. All of these sources of moisture/water caused dissolution of poorly cemented algal rudstone and sparite cement of grainstone. It resulted in crumbling, granular disintegration, or occurring of thin white crust on stone surface as consequence of redeposited ...
    ... 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 ...

  • Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

    Marija Živković, Dejan Ivezić (2021)
    Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...
    рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија
    ... heating systems. The use of this renewable energy source should provide primary energy savings of 5% per year, reduction of carbon dioxide emission of 6.5% per year, reduction of import dependency of DH systems of 9.8% and improved diversification of energy sources of 21%. * Dejan Ivezić dejan.ivezic@rgf ...
    ... installed capacity of district heating plants is over 6500 MW. In 2017, the total heated area was 42.34 million  m2, with a share of households of 81% (Association of Serbian district heating companies 2018). Approximately 20% of the total number of households in Serbia and 43.8% of households in cities ...
    ... for the determination of technical poten- tial of sewage wastewater heat, availability of heat energy and evaluation of the effects of its utilization on sustainable development goals contains three parts (Fig. 1). The first part aims to provide a current state overview of existing district heating ...

  • Influence of Ag doping on the morphological and magnetic properties in CuO nanopowders

    Maria Čebela, Uroš Čakar, Vesna Lojpur, Maja Milošević, Sanja Krstić, Vladimir Dodevski, Milena Rosić (2023)
    ... I), University of Belgrade Institute of Physics, University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions "CEXTREME LAB” - Institute of Nuclear Sciences "Vinča”, University of Belgrade Faculty of Mechanical Engineering ...
    ... Institute of Nuclear Sciences *Vinča”, University of Belgrade Faculty of Mechanical Engineering, University of Belgrade Center of Excellence for Green Technologies, Institute for Multidisciplinary Research, University of Belgrade Faculty of Technology and Metallurgy, University of Belgrade ...
    ... University of Belgrade Center of Excellence for the Synthesis, Processing and Characterization of Materials for use in Extreme Conditions “ĆCEXTREME LAB” – Institute of Nuclear Sciences “Vinča”, University of Belgrade Faculty of Mechanical Engineering, University of Belgrade Center of Excellence ...