Претрага

Упит dcterms_subject_txt:slope stability

158 items

  • Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept

    Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov (2019)
    Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...
    klizišta, podložnost, mašinsko učenje

  • Approach to operational mine planning: Case study Tamnava West

    Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Ranka Stanković (2014)
    ... economic parameters and detailed planning of all possible scenarios of production. Due to availability of the coal resources and their price stability, coal is and will retain its important role in power generation in Europe and worldwide 1. In Serbia, coal is the most important fuel in the ...

  • Crystal structure of K3EuSi2O7

    Sabina Kovač, Predrag Dabić, Aleksandar Kremenović (2021)
    alkalni silikati elemenata retkih zemalja, kristalna struktura, sinteza metodom fluksa, rendgenska difrakcija na monokristalu
    ... recent decades. Many studies were performed on REE silicates because of a wide range of optical and magnetic properties combined with high thermal stability.1‒9 All this makes them very interesting and promising materials for different applications. REE silicates also exhibit a broad structural diversity ...

  • Improvement of education through the cooperation between CEEPUS EURO Geo-Sci network and scientific projects: examples from UB-FMG

    Kristina Šarić, Dejan Prelević, Miloš Marjanović, Uroš Stojadinović, Vladimir Simić (2024)
    CIII-RS-0038, Recon Tethys, DEMONITOR, TMCmod, REASONING

  • Mineral Resources of Serbia: Environmental, Societal and Economic Challenges

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... tendency to increase with a rate of 3.37% and stability Cv = 8.33%. The highest average productions per continents was produced in America with 217,379,484 t. The soybean productions in America had a tendency to increase with a rate of 3.59% and stability Cv =9.31%. The lowest soybean productions was ...
    ... Wilkinson (1963), the adaptability and stability of a variety can be measured by the yield regression yield coefficient versus the yield average of all varieties in the test site. Varieties with a coefficient of regression of about l have an average stability, with a coefficient of regression of ...
    ... of less than l above-average stability, and varieties with a coefficient of regression greater than 1 show below average stability. The aim of the correlation analysis is to examine whether in the variation of observed phenomena exists quantitatively stacking and, if so, to what extent. The usual ...

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

    Miloš Gligorić, Jelena Majstorović, Suzana Lutovac (2018)
    ... Evaluation of polymers for conservation treatments of outdoor exposed stone monuments, Part I. Photo-oxidative weathering. Polymer Degradation and Stability, 91, pp. 3083–3096. FORT R., DE BUERGO M. A. and PEREZ-MONSERRAT E. M. (2013) Non- destructive testing for the assessment of granite decay in heritage ...

  • Permanent GNSS monitoring of landslide Umka

    Mileva Samardžić Petrović, Jovan Popović, Uroš Đurić, Biljana Abolmasov, Marko Pejić, Miloš Marjanović (2020)
    Клизиште Умка је једно од највећих насељених активних клизишта у Србији. Активност клизишта Умка се прати већ више од 85 година, различитим геотехничким и геодетским техникама. Од 2010. године, активност kлизишта се континуирано прати у реалном времену аутоматизованим перманентним системом за праћење базираним на Глобалним навигационим сателитским системима (ГНСС). Поред тога, од 2018. године активност клизишта се додатно прати кинематичким ГНСС одређивањем положаја скупа карактеристичних тачака као и применом UAV фотограметрије. Главни циљ овог рада је приказ резултата опажања три ...
    клизиште, перманентно праћење, ГНСС
    ... This was a part of the technological development project “The application of GNSS and LIDAR technology for infrastructure facilities and terrain stability monitoring“, financed by Ministry of Education, Science and Technological Development of the Republic of Serbia, and the collaboration between ...

  • Quantitative landslide risk assessment in the city of Tuzla

    Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović (2021)
    In the climate-changing conditions, geological environment interacts more dramatically with the urban fabric than before. The urbanization is expansive and more aggressive than before, but so are the weather extremes and long-term climate trends. In effect, many processes which can be triggered by either side, nature or engineering, are becoming more pervasive than before, and such is the case with landslides. Dealing and managing landslides requires few crucial steps, starting from collecting data on landslide location and typology – ...
    "landslides", "risk assessment"
    ... The accuracy went over 75%, while AUC of landslide classes was above 0.85 as well as marginally stable slope class, which indicates that the biggest source of error remained within the stable slope class (AUC=0.75). Landslide susceptibility led to quasi-hazard mapping that was generated by multiplying ...
    ... calculated to depict disturbed zones, since mining in Tuzla region includes open pit coal and underground salt mining. Both mining types can affect stability by causing subsidence (m order of magnitude) or producing waste deposits that are fine-grained non-cohesive but unstable when saturated. Distance ...
    ... the interaction between urban and natural can be violent from both sides. For instance, the fragile balance of the natural slopes is undermined by slope cuts and de-vegetation for infrastructure and construction, which is compensated by intensifying erosional and landslide processes, subsidence etc ...

  • 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
    ... temperature by a few "C. Keywordas: microemulsion, toluene, alky! polyglucoside, oxoalcoho/ ethoxylate, efficiency booster, “ish” diagrams. The stability of microemulsions over a large tem- perature range and low surfactant concentration is required for technical applications. Some investigat- ...

  • Mean-based iterative methods for finding multiple roots in nonlinear chemistry problems

    Dejan Ćebić, Nebojša M. Ralević (2021)
    нелинеарне једначине, поступци засновани на срединама, вишеструки корени,

  • BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1) Composites Synthesized by Thermal Decomposition: Magnetic, Dielectric and Ferroelectric Properties

    Marija Šuljagić, Ivan Petronijević, Miljana M. Mirković, Aleksandar Kremenović, Adis Džunuzović, Vladimir B. Pavlović, Aleksandra Kalezić-Glišović, Ljubica Andjelković (2023)
    To investigate the influence of spinel structure and sintering temperature on the functional properties of BaTiO3/NixZn1−xFe2O4 (x = 0, 0.5, 1), NiFe2O4, ZnFe2O4, and Ni0.5Zn0.5Fe2O4 were in situ prepared by thermal decomposition onto BaTiO3 surface from acetylacetonate precursors. As-prepared powders were additionally sintered at 1150 °C and 1300 °C. X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS) were used for the detailed examination of phase composition and morphology. The magnetic, dielectric, and ...
    ferroelectric, dielectric properties, magnetic properties, titanate/ferrite composites, phase composition
    ... properties were investigated. The optimal phase composition in the BaTiOy /NiFe»Ou composite, sintered at 1150 ?"C, resulted in a wide frequency range stability. Addi- tionally, particular phase composition indicates favorable properties such as low conductivity and ideal-like hysteresis loop behavior ...
    ... corresponding, AC conductivity are shown in Figure 6. In the low and mid frequency range, the dielectric constant value decreased with a relatively small slope for all inves- tigated pellets at both sintering temperatures. The reduction in dielectric constant with increasing, frequency can be related to ...
    ... sintered at 1300 *C (BaTiOx / NiFe)Oa—black, BaTiOx /ZnFe>»Oa—blue, and BaTiOy / Nip,s Zno s Fe)Oay—red) as log j—log, E dependence; n represents the slope of the curves in logarithmic plots. 3. Materials and Methods 3.1. Synthesis All chemicals (barium titanate (BaTiOxs, 99%), acetylacetone, ammonium ...

  • Differently shaped nanocrystalline (Fe, Y)3O4 and its adsorption efficiency toward inorganic arsenic species

    Biljana P Dojčinović, Boštjan Jančar, Lotfi Bessais, Aleksandar Kremenović, Nataša P Jović-Jovičić, Predrag T Banković, Dalibor M Stanković, Miloš Ognjanović, Bratislav V Antić (2019)
    Herein we report effects of partial substitution of Fe3+ by Y3+ in magnetite (Fe3O4) on morphology and inorganic arsenic species adsorption efficiency of the Fe3−xYxO4 nanoparticles formed. The series of Fe3−xYxO4 (x=0.00, 0.042 and 0.084, labeled as Y00, Y05 and Y10, respectively) was synthesized using co-precipitation followed by microwave-hydrothermal treatment (MW) at 200°C. With increase of yttrium content(xvalue), both the morphological inhomogeneity of the samples and the fraction of spinel nanorods as compared to spinel pseudospherical particles increased. By ...
    microstructure, microwave-hydrothermal synthesis, adsorption, magnetic nanoparticles, arsenic

  • 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
    ... recoverable coal reserves; desolated areas; the destruction of humus layer; a change in pedological and geological composition; disturbance of soil stability; land subsidence; disposal of tailings, ash, and slag; and delivery of coal dust and ash through airflow and gas emissions from coal combustion. ...
    ... improving the environmental protection system in mining and energy complex by applying the sustainable development principles, while maintaining energy stability and environmental quality [28]. Not least, improvement of the environmental protection system in mining and energy complex is of particular importance ...
    ... improving the environmental protection system in mining and energy complex by applying the sustainable development principles, while maintaining energy stability and environmental quality [28]. Not least, improvement of the environmental protection system in mining and energy complex is of particular importance ...

  • Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs

    John Nyame (2024)
    The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...
    Carbon Capture, Utilization and Storage
    ... adsorption. [32] Metrics for adsorption capture include high working capacity and selectivity, low cost, low regeneration requirements, long-term stability, and fast kinetics. Although adsorption- based separation can address most of the limitations of the absorption processes, the current technologies ...
    ... for CO» capture from flue gas or other effluent streams. Although inorganic membranes can withstand high temperatures and often have mechanical stability, their high costs stili hamper their commercialization. Inorganic membranes have not yet been demonstrated on a large scale, and in fact, they are ...
    ... main challenges associated with their large-scale utilization stem from their manufacturing routes, which are very expensive, and their long-term stability and reliability. Polymeric membranes that can be easily formulated in fiber modules have shown tremendous potential for large-scale industrial ...

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... and F1-score are used. b.Cross-Validation- A technique for assessing how the model will perform on unseen data, helping to evaluate the model's stability and robustness. • Model Application a.Prediction - The model is used to predict the pump's condition in real-time based on current sensor data ...
    ... parameters, enabling quick detection of anomalies and optimization of operation. The efficient and reliable functioning of these pumps is vital for the stability of the entire system. To ensure optimal performance and timely response to potential issues, it is important to use appropriate sensors for monitoring ...
    ... increases with temperature, and the relationship between temperature and resistance is nearly linear. RTD sensors are known for their high accuracy and stability and are often used in applications where precision is required. 37 Figure5.9 Resistance temperature detectors (RTD) b) Thermocouples -– Sensors ...

  • Geoenvironmental Investigations at a Smelter Location in Bor (Serbia)

    Petar Papić, Zvonimir Milijić, Jana Stojković, Jovana Milosavljević, Maja Todorović, Marina Ćuk, Željko Kamberović (2014)

  • 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)
    ... high levels, with 8m-10m wide bed- ding planes, the angle of inclination of slopes 55°-65° and a general end slope of 33°. Bauxite is being excavated up to the �ooring so that the stope slope is milder in the northwestern part and there are roads for the bauxite transport located. The stope is open ...
    ... scanning of the open pit levels (Figure 5), which are interactive with the designed bench drifts for the purposes of geomechanical analysis of the stability; - Detailed scanning of the existing mine chambers. Figure 5 Parts of open pit benches in interaction with bench drifts The extraction activity ...

  • The state and perspective of the natural gas sector in Serbia

    Dejan Ivezić, Marija Živković, Dušan Danilović, Aleksandar Madžarević, Miloš Tanasijević (2016)
    The strategy of long-term energy development of Serbia identifies an increase of share of natural gas in final energy consumption as one of the main aims. Serbia has signed a strategic agreement with the Russian Federation on cooperation in the oil and gas sector, within which the project South Stream pipeline is planned to be realized. In addition, the Republic of Serbia has signed the Treaty that establishes the Energy Community and accepted the obligation to implement the Energy ...
    Consumption, natural gas, scenarios of development

  • A tool for identifying the criticality in the disordered systems with metastable dynamics

    Svetislav Mijatović, Dragutin Jovković, Sanja Janićević, Stefan Graovac, Đorđe Spasojević (2021)
    Физика кондензоване материје

  • Projecting short to medium-term effects of carbon emissions trading on Serbia's GDP

    Boban Pavlović, Nikola Trtica (2024)
    This paper presents an approach to assess the short to medium-term effects of the Emissions Trading System (ETS), an economic and climate policy instrument aimed at reducing greenhouse gas emissions, on GDP from the expenditure side. The analysis focuses on Serbia’s electricity sector, which relies heavily on lignite-based pro duction dominated by state-owned enterprises. The obtained projections suggest that in the short term, the introduction of an ETS may lead to slower GDP growth compared to official forecasts. However, ...
    ETS, BDP - rashodni pristup, cene električne energije
    ... pivotal as Serbia's primary trade and Utilities Policy 91 (2024) 101855 investment partner, significantly contributing to the nation's economic stability. In terms of energy, Serbia, along with other Western Balkan countries, has joined the Energy Community, committing to gradually aligning with ...
    ... 3.5% in 2024. This growth will be supported by increased spending and investment, suggesting a positive outlook for the country's economic stability and progress (World Bank, 2024). Projected real GDP growth for 2025, 2026, and 2027 expects an additional acceleration to the range of 4.5%, in ...