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Упит dcterms_subject_txt:the house of algebraic integer

2844 items

  • The application of ArcGIS for assessing the potential of solar energy in urban area: The case of Vranje

    Boban Pavlović, Milica Pešić-Georgiadis (2019)
    In order to determine the solar energy potential for a specified location, it is crucial to consider the latitude, altitude, slope, terrain morphology, atmospheric conditions, etc. Such a complex calculation and mapping of solar energy can be done using the ArcGIS geoprocessing tool, named Area Solar Radiation (ASR). By using the ASR tool, supported with the adequate input data, it is possible to calculate the maximum solar radiation energy (irradiation) for a defined area and for a specified time ...
    Obnovljivi izvori energije, potencijal solarne energije, GIS, mapiranje solarnog potencijala
    ... located in the Southern Region of Serbia. The extraction of the urban area was carried out using the CORINE Land Cover Open Data – the product of the visual interpretation of high-resolution satellite imagery. According to the ASR calculation, the maximum irradiation for a selected part of the urban ...
    ... Greece For the optimal use of solar panels, the morphology of the terrain is also crucial. The variability of morphological factors, such as altıitude, slope, and aspect, affects the length of direct solar radiation. In „addition, the morphology also affects the level of shading of the area, which ...
    ... Overview of The Solar Analyst Tool The Solar Analyst Tool (SAT) allows the analysis of the effects of solar radiation. The algorithm which is implemented in the SAT is developed and later upgraded by the authors — Paul Rich and Pinde Fu (1999). As the authors of the SAT point out, the calculation ...

  • 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
    ... at the start of testing. The difference in readings represented the variation in length of the tested sample, while shrinkage of the cement mortar was expressed as the ratio of length variation and the initial length of the sample at the start of testing. Mortar shrinkage εsm,i was calculated according ...
    ... volume of the cement paste shrinking during hardening. The replacement of cement with waste material had the effect of reducing the adhesion of the mortar to the concrete substrate. With an increase in the percentage of cement replacement, the adhesive strength decreased, with a decrease of 6–47% (Figure ...
    ... meet the prescribed conditions in terms of its characteristics, could be used as a replacement for cement. Namely, the results showed that the lack of slag in terms of the content of SiO2, Al2O3, Fe2O3, and unburned carbon, and the loss of ignition, may be overcome by the thermal treatment of the slag ...

  • Environmental Energy Security Indicators as Tools for Environmental Protection

    Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević (2019)
    Еколошка прихватљивост је постала незаменљив синтезни показатељ сваке валидне енергетске анализе у последње две-три деценије. Енергетска безбедност је у директној хармонији с еколошком прихватљивошћу кроз многе прописане политичке циљеве, економске користи, правне тековине итд. Индикатори еколошке сигурности представљају један од основних елемената за одређивање енергетске безбедности и снажне алате за усмеравање енергетског сектора ка одрживом развоју. У овом раду, анализа је била концентрисана на показатеље енергетске безбедности у области животне средине који се односе на сектор природног гаса у ...
    енергетска безбедност, еколошки енергетски индикатори, заштита животне средине, еколошка прихватљивост
    ... on the type of energy source. At the same time, through the mentioned partial indicators, one can see the reduction or increase of emissions at the national as well as the sector level, the proportions of the use of renewable sources, as well as the energy intensity by sectors, reduction of energy ...
    ... primarily on the type of energy used and the sector used, which causes the combustion regime, the existence of filters, etc. The emission factors of the solid particles and the unit of energy produced are shown in Table 4. The use of energy sources (low efficiency devices, without modern measurement ...
    ... process of such plants is the combustion of fossil fuels for the production of thermal energy, and very careful consideration is given to the modes of operation of the plant, equipment and adequacy of equipment, as well as regular maintenance of it. 5 Table 4. The emission factors of the ...

  • Investigation of quantitative indicators of anisotropy based on longitudinal elastic waves propagation velocities with uncertainty

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)
    ... indicators of anisotropy: anisotropy coefficient K and degree of anisotropy D. The following section provides a detailed description of the concept of calculation and formulas. There are several ways to determine the degree of anisotropy and anisotropy coefficient. Our investigation of the degree ...
    ... highly difference of quantitative indicators of anisotropy. Isotropic samples are more uniform and more compact than anisotropic samples. The proof is that the obtained results are approximately the same for both approaches of determining the degree of anisotropy. The existence of that high similarity ...
    ... 3 − 3′. In this study, the total number of samples varies depending on the type of samples. There are two types of samples: isotropic and anisotropic samples. The total number of isotropic samples are 24 and the total number of anisotropic samples are 26. Input parameters are defined as follows: ...

  • 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

  • Geotechnical conditions of “Debelo brdo” tunnel construction on the highway E-80: Nis-Merdare-Pristina (“Peace Highway”)

    Dragoslav Rakić, Irena Basarić Ikodinović, Radojica Lapčević, Dragan Lukić (2024)
    The construction of the highway E-80 has begun in Serbia, which will represent the traffic hub of the Western Balkans and will be part of the main regional transport network of Southeast Europe. Its total length through Serbia is 77 km, and one part of the route is designed through a typical plain terrain, while a larger part of the route passes through hilly terrain. The construction of the tunnel “Debelo brdo” is planned partly in an open cut ...
    „Debelo brdo“ tunnel, temporary slopes, open cut excavation, tunnel excavation, piles

  • The influence of Al<sup>3+</sup>ion on porcine pepsin activity<i>in vitro</i>

    Vesna M. Pavelkić, Kristina R. Gopcević, Danijela Z. Krstić, Marija A. Ilić (2008)
    The in vitro effect of Al3þ ions in the concentration range 1.7·1026M–8.7·1023M on pepsin activity at pH 2, via kinetic parameters and its electrophoretic mobility was evaluated. Kinetic study demonstrated the existence of an activation effect of Al3þ at pH 2 on pepsin molecule. Kinetic analysis with respect to concentrations of haemoglobin showed that Al3þ ions increase the maximal velocity (Vmax) and kcat values rather than apparent affinity for substrate (KS) implying the non-competitive nature of activation which indicated ...
    Пепсин, алуминијум, кинетика, активација, електрофоретска мобилност
    ... utilization of nutrients. Aluminium affects the activity of a-chymotrypsin, in the presence of its specific bovine pancreatic trypsin inhibitor; at the pH 6.5 in the presence of aluminium, the enzyme activity is doubled, and the inhibitor is only 1% as effective as in the absence of the metalion ...
    ... Activation of pepsin by Al * ions; The intercepts on the abscissa of the primary plot of [Hb]/V against reciprocal of activator concentrations provide the values of Aso used to obtain the plots of 1/Aso against vo/V shown in the inset. B, curve 2) contain characteristic bands of haemo- globin ...
    ... charge of the molecules of enzyme and cause the differences in its electrophoretic mobility. "The decrease in the electrophoretic mobility of pepsin molecule may be assigned to the change in net electric charge of the pepsin caused by binding of Al'* ions to corresponding binding sites of pepsin ...

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... considering the topographical changes of the green space that would directly affect the degradation of agricultural lands. Predictions of the effects on the environment are very important and present the concern in the sense of the loss of surface area and space for living. The study on the environment ...
    ... (Table 2). The subject of our research is the surface mine Drmno viewed as a training: ground for experimental analysis of the choice of the type of reclamation and the appropriate arrangement of the landscape. Such process modeling of the unified reclamation system foresees a total of 10 alternative ...
    ... basin is part of the municipality of Kostolac and the Braničevo district. The Drmno deposit area, as part of the southern rim of the Pannonian basin, has a moderately continental climate, in which the steppe-continental climatic influences of the neighboring Banat are emphasized. The average annual ...

  • Towards Better Valorisation of Industrial Minerals andRocks in Serbia—Case Study of Industrial Clays

    Vladimir Simić, Dragana Životić, Zoran Miladinović (2021)
    Management, Monitoring, Policy and Law,Nature and Landscape Conservation
    ... Rulebook [52] and the practice in clay exploration. The concept of the Rulebook is based on the classification of mineral reserves of the former Soviet Union from the 1960s, but with many peculiar addi- tions and specifics. In all the above classifications, the basis for the categorisation of re- serves is ...
    ... is the maximum distances between exploration works and the maximum length of sampling interval. Tables 4 and 5 show the recommended distances from the basic classi- fication of clay rock reserves of the USSR from 1961 [54], which remained unchanged in the classification of the Russian Federation from ...
    ... in the last 30 years, as well as legislation related to the mining industry and access to land. The improvement of legislation mostly depends on the state authorities. Contrary to that, the enhancement of geological exploration methodology should be the issue of experts working in that area of the ...

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... and the second determining the number of piles. i.e. the overall size of the stockyard. In both cases the length, width and height of the stacked coal are sized. In these considerations the problem of self-inflaming of coal, availability of space, availability of funding, etc., are not taken into ...
    ... coal of uniform quality, the stacking method/sub-method can also be defined. In the case of the "Tamnava - Zapad" pit the selected method was the strata method from the chevron group. The strata method is characterized by the forming of conical piles along the entire stacking length. The first ...
    ... autonomy of pit and power plant operation. Instead of defining the required daily reserves, homogenization stockyard sizing is based on the quality range of the observed parameter. In the case of the "Tamnava - Zapad" pit, the observed parameter is heating value. Because of the variability of this ...

  • Split-Desktop software for the analysis of fragment size distribution of blasted rock mass

    Milanka Negovanović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić, Snežana Ignjatović (2023)
    Drobljenje stena je najvažniji pokazatelj u proceni efekata miniranja pri proizvodnom miniranju u površinskoj eksploataciji. Stepen drobljenja stena ima veliki uticaj na efikasnost daljih operacija utovara, transporta, drobljenja i mlevenja. Optimalno drobljenje stena pri proizvodnom miniranju utiče na smanjenje ukupnih troškova proizvodnje. Stoga je pouzdana procena veličine drobljenja odminirane stenske mase veoma važno pitanje, ne samo u operacijama miniranja, već i u rudarskoj proizvodnji. Za predviđanje distribucije veličine komada odminirane stenske mase postoje različiti empirijski modeli. KUZ-RAM model omogućava ...
    Split-Desktop softver, drobljenje stena, miniranje, analiza, digitalna obrada fotografija

  • Evaluation of the effects of wastewater heat pump integration into district heating systems by simulation

    Dejan Ivezić, Marija Živković, Dimitrije Manić, Aleksandar Madžarević, Boban Pavlović, Dušan Danilović (2023)
    The integration of wastewater heat pumps (using purified water) in district heating systems is analyzed in this paper. The simulation procedure is proposed to analyze the impacts of stochasticity of purified water temperature and flow to heat pump integration and operation. The analysis includes calculation of the daily and seasonal coefficient of performance, as well as fossil fuel savings and CO2 emission reduction due to wastewater heat pump use. The proposed procedure is implemented for the case study in ...
    otpadne vode, toplotna pumpa, daljinsko grejanje, simulacija

  • Selection of Artificial Lift Methods: A Brief Review and New Model Based on Fuzzy Logic

    Miroslav Crnogorac, Miloš Tanasijević, Dušan Danilović, Vesna Karović Maričić, Branko Leković (2020)
    Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based ...
    mehaničke metode, proizvodnja nafte, fazi logika, donošenje odluka, optimizacija
    ... According to the diagram (Figure 8), if the parameters increase, the center of gravity moves to the right. When the parameters are reduced, the center of gravity moves to the left of the diagram. The uneven shift of the focus to the left side of the diagram is due to a considerable number of parameters ...
    ... surface that is standard. The level of overlapping the surface, which represents the result for the new well and some of the standard surfaces, represents the level of applicability of the standard method for the conditions of the new well. Figure 6a shows the standard of all methods. In Figure 6b–f ...
    ... step narrows the selection, based on technical limitations of the methods applied. The parameters considered are: pump volume capacity, the depth in combination with the desired dynamic pressure at the bottom of the well, the deviation of the well, and characteristics of the reservoir. The second step ...

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

    Roberto Linzalone, Giovani Schiuma, Ivan Obradović, Ranka Stanković (2015)
    ... [5]. According to the aims of the evaluator, the main objective of the evaluation, the evaluand, the sector/field, the developmental stage of the project, a wide range of evaluation approaches can be identified. On the basis of the developmental stage of a project the evaluation can be: ...
    ... reach of explanatory power. The function of the evaluation model is to make clearer the system and allows for more explicit analysis of the project through analysis of the components of the system, which is the promise of a ‘‘white box’’ approach. Furthermore, this type of analysis of the inner ...
    ... Evaluation of e-learning projects takes into account the benefits and the costs due to the project, from its inception to the extinction of its effects. This paper, using the e-learning project as the 'unit of analysis', proposes and promotes the adoption of the Logical Framework Approach, in the designing ...

  • The effect of finite driving rate on avalanche distributions

    Sonja Radić, Sanja Janićević, Dragutin Jovković, Đorđe Spasojević (2021)
    Statistics, Probability and Uncertainty,Statistics and Probability,Statistical and Nonlinear Physics

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... into the modified Equation (7), resulting in the end choice of the dozer. The values of the results are shown respectively in Table 17. 4. Discussion The application of the AHP method as one of the most used method of multicriteria decision analysis (MDCA) showed the rank of different types of dozer ...
    ... advantage of the AHP method is its ability to identify and analyse the inconsistency of the decision-maker in the process of deciding on the priorities in the hierarchal structure. The general schematic display of the AHP method structure is shown in Figure 2. The goal (zero level) of the AHP method ...
    ... Figure 2. The schematic display of the structure of the analytical hierarchy process (AHP) method. The mathematical basis of the AHP method consists of four steps: 1. Production of a hierarchical model, that is, the structure of the decision-making problem (presented in Figure 2); 2. The use of an appropriate ...

  • An intelligent hybrid system for surface coal mine safety analysis

    Nikola Lilić, Ivan Obradović, Aleksandar Cvjetić (2010)

  • WebGIS Cadastre of Abandoned Mines in Autonomous Province of Vojvodina

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2015)
    ... that match the user query. Users can search by titleholder name, mineral resource, type and status of the object, etc. The lower part of the screen displays a list of abandoned pits that match the query, and the user has the option to view each of them in more detail: to zoom or read the record stored ...
    ... record of an abandoned facility or records about all abandoned mining facilities in the municipality, district or national park. Statistical reports provide an overview of the use of the application on the basis of log data (logons) and data entry, as well as the number of visits of the site using ...
    ... managing the registry of abandoned mining facilities 4. CONCLUSION In this paper we presentеd the results of the strategic project „Cadastre of abandoned mines on the territory of the autonomous province of Vojvodina and accompanying database" realized by University of Belgrade, Faculty of Mining ...

  • SASA Dictionary as the Gold Standard for Good Dictionary Examples for Serbian

    Ranka Stanković, Branislava Šandrih, Rada Stijović, Cvetana Krstev, Duško Vitas, Aleksandra Marković (2019)
    У овом раду представљамо модел за избор добрих примера за речник српског језика и развој иницијалних компоненти модела. Метода која се користи заснива се на детаљној анализи различитих лексичких и синтактичких карактеристика у корпусу састављених од примера из пет дигитализованих свезака речника САНУ. Почетни скуп функција био је инспирисан сличним приступом и за друге језике. Дистрибуција карактеристика примера из овог корпуса упоређује се са карактеристиком дистрибуције узорака реченица ексцерпираних из корпуса који садрже различите текстове. Анализа је показала да ...
    Српски, добри примери из речника, аутоматизација израде речника, издвајање својстава, Машинско учење
    ... Interlinking of related words is envisaged as more explicit, on the level of lexical units (senses), which will enable the reuse of dictionary content that already exists in the database. The fine-grained structure of the database enabled the creation of a dataset of examples supported by a set of related ...
    ... on by number of words in the examples. On the left side each volume of SASA dictionary is represented by a histogram with parts of speech in different colours. The right-hand side shows histograms of partitions of the control dataset. Figure 1: The histogram of the number of words in examples ...
    ... two volumes of the SASA dictionary have a wider span of frequency indicators than other volumes (as expected, due to the type of the lexis contained in each volume; for example, the majority of the lexis beginning with a, contained in the first volume, is of foreign origin, while the second volume ...

  • Determining the Availability of Continuous Systems at Open Pits Applying Fuzzy Logic

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović (2022)
    This work presents a model for determining the availability of continuous systems at open pits by applying fuzzy logic and fuzzy inference systems. The applied model was formed by the synthesis of independent partial indicators of availability. The model is based on an expert system for assessing the availability of continuous mining systems. The availability of the system, as a complex state parameter, is decomposed into the partial indicators, reliability, and convenience of maintenance, and the fuzzy compositions, used ...
    системи, континуални систем експоатације, површински коп, рударство, расположивост, фази логика, max–min композиција, min–max композиција