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Упит dcterms_subject_txt:General Chemical Engineering

747 items

  • Preliminary regional landslide susceptibility assessment using limited data

    Igor Peshevski, Milorad Jovanovski, Biljana Abolmasov, Jovan Papic, Uroš Đurić, Miloš Marjanović, Ubydul Haque, Natasha Nedelkovska (2019)
    In this paper a heuristic approach for preliminary regional landslide susceptibility assessment using limited amount of data is presented. It is called arbitrary polynomial method and takes into account 5 landslide conditioning parameters: lithology, slope inclination, average annual rainfall, land use and maximum expected seismic intensity. According to the method, in the first stage, a gradation is performed for each of the carefully selected conditioning parameters by assigning so called rating points to the grid cells on which the ...
    klizišta, podložnost
    ... Methodius, Faculty of Civil Engineering, Blvd. Partizanski odredi No.24, 1000 Skopje, Republic of Macedonia; (pesevski@gf.ukim.edu.mk) 2 University of Belgrade, Faculty of Mining and Geology, Đušina 7, 11000 Belgrade, Serbia 3 University of Belgrade, Faculty of Civil Engineering, Bulevar Kralja Aleksandra ...
    ... Macedonia were considered. After analysis of all the available thematic geological, engineering geological, geotechnical maps and cross-sections, and geotechnical reports, lithological units were grouped into six engineering-geological groups with simi- lar physical-mechanical behavior. The rating values ...
    ... Doctoral thesis.− Faculty of Civil Engineering, Skopje, 181 p. PESHEVSKI, I., JOVANOVSKI, M., PAPIC, BR. J. & JOVICIC, L. (2015b): Prep- aration of landslide susceptibility maps using GIS, recent case study in R. Macedo- nia.– Scientific Journal of Civil Engineering, 4/1, 47–53. PESHEVSKI, I., PETERNEL ...

  • Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach

    Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2021)
    Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome these problems, the selection of the appropriate formulation technology needs to be based on the physicochemical properties of the drug and introduced in the early stages of drug research. One example of the new potential drug substance with poor solubility is DK-I-60-3, deuterated pyrazoloquinolinone, designed for the treatment of various neuropsychiatric ...
    pyrazoloquinolinones, nanocrystals, wet media milling, fasted/fed bioavailability
    ... 11000 Belgrade, Serbia; danijela@nanosys.ihtm.bg.ac.rs * Correspondence: snezana.savic@pharmacy.bg.ac.rs Abstract: Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome ...
    ... - logical drugs led to the development of drug candidates with increased lipophilicity and high molecular weight. It is estimated that 90% of new chemical entities are poorly soluble, which is recognized as a major obstacle in drug development [1]. Because conventional for- mulations fail to meet re ...
    ... DK-I-60-3 by Nanonization: A Knowledge-Based Approach. Pharmaceutics 2021, 13, 1188. https: / /doi.org/10.3390/ Abstract: Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome ...

  • Extensive vibrations of the belt conveyer drive electromotor of a bucket wheel excavator as a result of intesified wear-and-tear of its mount support

    Vesna Damnjanović, Predrag Jovančić, Snežana Aleksandrović (2017)

  • GNSS Time Series as a Tool for Seismic Activity Analysis Related to Infrastructure Utilities

    Sanja Tucikešić, Ankica Milinković, Branko Božić, Ivana Vasiljević, Mladen Slijepčević (2021)
    GNSS, Time series, Seismic deformations, Earthquake, Infrastructure utilities

  • Компарација метода XRF i ICP-MS на узорцима угља и продуктима сагоревања

    Бранко Костић, Ксенија Ераковић, Дејан Прелевић, Сабина Ковач, Драгана Животић (2023)
    геохемија, угаљ, продукти сагоревања, XRF, ICP-MS

  • Application of the Fuzzy Model in the Evaluation and Selection of Hydraulic Excavators on Open-Pit Lignite Mine

    Stevan Đenadić, Miloš Tanasijević, Vladimir Milisavljević, Dragan Ignjatović, Predrag Jovančić (2021)
    The production of lignite in large open-pit mines is mainly performed with continuously operating equipment, where bucket-wheel excavators, bucket-chain excavators, belt conveyors, and spreaders are the basic machines. Smaller machines, usually of discontinuous operating nature, are commonly categorized as auxiliary machines. This paper presents the research related to the analysis of auxiliary machine parameters with the case study for a hydraulic excavator. The purpose of the analysis was to develop a model of rating quality of service of the ...
    Fuzzy theory, hydraulic excavator, selection, quality of service, asset management

  • Hydraulic impact of pressure transients from water conveyance tunnel on the complex hydrogeological system: A case study HPP

    Igor Jemcov, Maja Todorović, Aleksandar Jemcov, Marina Ćuk Đurović (2024)
    Tunel pod pritiskom, Unutrašnji pijezometri, Tranzijenti pritiska, Karstna izdan, Pukotinska izdan, Hidraulički odziv
    ... complex void system, that affects the hydraulic properties of fractured rocks. These properties can change due to engineering activities during construction and operation in many engineering practices (Zhou et al., 2023). According to their construction, tunnels can be either unlined or lined. The type ...
    ... with geological environments and groundwater, a phenomenon that becomes increasingly pronounced during long-term operation. Section snippets General characteristics of the HPP Pirot system Hydropower plant (HPP) Pirot is situated in the southeastern part of Serbia and utilizes Wwater from the ...
    ... Tunnel project Colombia. Appl Geochem (2018) C.B. Zhou et ol. Groundwater flow through fractured rocks and seepage control in geotechnical engineering: rheories and practices JRMGE (2023) B.Q. Zhou et aL Assessing the impact of tunnelling on karst groundwater balance by using lumped parameter ...

  • Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Zoran Stevanović, Laszlo Palcsu (2020)
    Geochemistry and Petrology

  • Characterization of Natural Clay from Bogovina (Serbia) and Possible Utilization in Sorption of the Herbicides

    Lazar Kaluđerović, Zorica Tomić, Rada Đurović-Pejčev, Maja Milošević (2021)
    ... onite samples from Bogovina (Serbia) were pretreated with 1M NaCl, and then with different concentrations of two organic complexes (HDTMA, PTMA). Chemical analysis of the sample showed that natural montmorillonite from Bogovina (Serbia) was Ca montmorillonite.  The whole modification process was ...
    ... montmorillonite modification. Positive relationship between the parameter Kf and the content of the organic complex was found. A general trend of sorption can be presented in the following sequence: Natural clay < Na-montmorillonite < PTMA-montmorillonites < HDTMA-montmorillonites ...

  • Agates of the Lece Volcanic Complex (Serbia): Mineralogical and Geochemical Characteristics

    Zoran Miladinović, Vladimir Simić, Nenad Nikolić, Nataša Jović Orsini, Milena Rosić (2024)
    Agate veins and nodules occur in the Lece Volcanic Complex (Oligocene-Miocene) situated in the south of Serbia and occupying an area of 700 km2. This volcanic complex is composed predominantly of andesites, with sporadic occurrences of andesite-basalts, dacites and latites, and features agate formations that have been very little investigated. This study focuses on five selected agate occurrences within the Lece Volcanic Complex, employing optical microscopy, scanning electron microscopy (SEM), X-ray powder diffraction analysis, inductively coupled plasma mass spectrometry ...
    Lecki vulkanski kompleks, andeyit, kalcedon, kvarc, opal-CT, mikrostruktura, organska materija

  • 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
    ... Miljkovic, M.; Stojkovic, Z. Influence of Metal Ores Surface Extraction to Environmental Factors of the Environment; Faculty of Engineering, Department for mining engineering, University of Belgrade: Bor, Serbia, 1998. 8. Nikolic, J.M. Indicators of Sustainable Thermal Energy Systems Based on Coal Surface ...
    ... Construction Technology and Organization—A Collection of Solved Problems with Excerpts From the Theory; Faculty of Civil Engineering and Architecture, Department for civil engineering, University of Nis: Niš, Serbia, 2012. 13. Ghezloun, A.; Oucher, N.; Chergui, S. Energy policy in the context of sustainable ...
    ... on of the standard ISO 31000 for risk assessment in mining and energy complexes is suitable because it encompasses all types of risk (biological, chemical, and physical—according to the degree of identification; accidental or Energies 2016, 9, 1071 16 of 20 cumulative—according to the dynamics of ...

  • Korelacija magnetnog susceptibiliteta i sadržaja metala u flotacijskom jalovištu

    Filip Abramović, Vesna Cvetkov, Aco Ilić, Dragana Životić (2022)
    Procena metala u rudama, jalovištu i zemljištu se tradicionalno određuje hemijskim metodama kao što su Rengen fluorescentna analiza (XRF), Instrumentalna neutronska aktivaciona analiza (INAA) i Masena spektrometrija induktivno spregnute plazme (ICP-MS). Neke od pomenutih metoda su veoma zahtevne i skupe, te se nametnula potreba ka traženju jeftinijeg alata za brzu procenu prisustva pojedinih metala. Tokom poslednjih nekoliko decenija, mnoge studije su pokazale da su magnetna merenja dovoljno osetljiva da detektuju magnetni signal feromagnetnih materijala, a samim tim i metala ...
    flotacijsko jalovište, makroelementi, magnetna merenja

  • Application of stochastic models for mine planning and coal quality control

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... information on coal properties is essential for reli- able operational mine planning [8]. Generally two types of grade variability exist in the coal chemical composition (fig. 1): – long-term variability as measured by trends of monthly or longer duration, and – operational variability is generally measured ...
    ... geological constraints, policies and mining methods. Secondly, the quantity re- quirements must ensure sufficient coal produc- tion. This model, in general, is based on predicted information about the in-situ quality of the coal deposit. Consequently, production scheduling for the purpose of controlling ...
    ... intersections is even, then the value of the func- tion is 0, and if it is odd, the value of the function is 1. By plugging this function in the general formula for Monte Carlo integration, one can approximate the area of the polygon. In order to calculate the intersection of the polygons P1, P2, ...

  • Energetska bezbednost sektora prirodnog gasa Srbije

    Aleksandar Madžarević, Predrag Jovančić, Miroslav Crnogorac (2023)
    U prve dve decenije 21. veka obezbeđivanje sigurnosti snabdevanja prirodnim gasom domaćeg tržišta bio je jedan od prioriteta razvoja energetike Srbije. Istovremeno, aspekt sigurnog snabdevanja bio je neizostavni deo slagalice stvaranja energetske bezbednosti. Izražena uvozna zavisnost je dominantna karakteristika sektora prirodnog gasa, tačnije, Republika Srbija je snažno zavisna od ruskog gasa, sa više od 80% uvezenih količina gasa, a do pre dve godine snabdevala se isključivo kroz jednu interkonekciju. U radu se razmatra aktuelna situacija u sektoru prirodnog ...
    N-1, IDUPS, energetska bezbednost, sigurnost snabdevanja
    ... Mechanical Engineering, UB. He completed his author) undergraduate and graduate academic studies in the module Process Engineering and Environmental Protection in 2011. He finished his doctoral studies at the Faculty of Mining and Geology, UB, in the study program Mining Engineering. He works ...

  • The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments

    Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević (2013)
    The objective of the study was to determine the origin and type of organic matter (OM) of the Tisza recent sediments along the distance of 153 km through the territory of Serbia. For this purpose group organic-geochemical parameters and biomarker compositions were used. All samples contain approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, n-alkane patterns ...
    sediments, Tisza River, organic matter, biomarkers, oil pollutants
    ... river sediments | Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević | Journal of Serbian Chemical Society | 2013 | | 10.2298/JSC130614087S http://dr.rgf.bg.ac.rs/s/repo/item/0002360 Дигитални репозиторијум Рударско-геолошког факултета Универзитета ...
    ... matter (OM) in recent sediments of the Tisza River, along a distance of 153 km through the territory of Serbia. For this purpose, group organic–geo- chemical parameters and biomarker compositions were used. All samples con- tained approximately same amount of OM, which was deposited under uni- form, slightly ...
    ... * Corresponding author. E-mail: ksenija@chem.bg.ac.rs; xenasyu@yahoo.com # Serbian Chemical Society member. doi: 10.2298/JSC130614087S ___________________________________________________________________________________________________ ...

  • 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

  • Regional Slope Stability Analysis in Landslide Hazard Assessment Context, North Macedonia Example

    Miloš Marjanović, Biljana Abolmasov, Igor Peshevski, James Reeves, Irena Georgievska (2020)

  • A Mathematical Learning Environment Based on Serbian Language Resources

    Radojičić Marija, Obradović Ivan, Stanković Ranka, Utvić Miloć, Kaplar Sebastijan (2018)
    In recent years, in line with ever growing usage of Information technology, the learning environments are changing. The amount of available learning materials in various forms has increased. These new environments demand comprehensive learning systems, which enable management of the learning corpus with special attention paid to relevant lexical resources. In this paper we present the concept of a Mathematical Learning Environment in Serbian (MLES), which is based on a corpus of mathematical materials and various lexical resources, enabling ...
    mathematical content, text processing, mathematical formulae
    ... Although the general lexica in Serbian is well covered, mathematical terminology needs further improvements. MLES presents a system that supports managing and usage of mathematical content in Serbian. The ultimate goal is the integration of real life problems from engineering practice in the ...
    ... system component also extracts mathematical concepts from problems related to engineering practice. The process is based on clustering, categorizing and defining mathematical concepts from the base of relevant engineering problems. Figure 3. MLES application 3. GOALS AND CHALLENGES Searching ...
    ... resources, enabling semantic search of mathematical content. A specific use of the system is mathematical support in solving real life problems from engineering practice. To that end complex issues had to be resolved, such as mathematical text analysis, processing of mathematical content in different ...

  • A Knowledge-Based Approach to Mine Ventilation Planning in Yugoslav Mining Practice

    Nikola Lilić, Ivan Obradović, Ranka Stanković (2002)
    Ventilation system analysis is a complex process based on the calculation and analysis of numerous parameters. These problems can be successfully solved by the SimVent numerical package, but a full understanding and use of the obtained results require the involvement of an experienced specialist in the ventilation field. The solution was found in the creation of a hybrid system INVENTS, whose knowledge base represents a formalization of the expert knowledge in the mine ventilation field. In this paper, we ...
    ... various limitations imposed by current engineering practice. The existence of this possibility for obtaining alternative solutions in the selection of the most favorable one is very important especially in view of complex problems often posed by the engineering practice. Fig. 16. The user interface ...
    ... Knowledge-Based Approach to Mine Ventilation Planning in Yugoslav Mining Practice | Nikola Lilić, Ivan Obradović, Ranka Stanković | Mineral Resources Engineering | 2002 | 11 | 4 10.1142/S0950609802001014 http://dr.rgf.bg.ac.rs/s/repo/item/0002559 Дигитални репозиторијум Рударско-геолошког факултета Универзитета ...
    ... ns available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Mineral Resources Engineering, Vol. 11, No. 4 (2002) 361–382 c© Imperial College Press A KNOWLEDGE-BASED APPROACH TO MINE VENTILATION PLANNING IN YUGOSLAV MINING PRACTICE NIKOLA ...

  • Granatski amfiboliti Bistrice

    Jovana Opančina (2024)
    Predmet ispitivanja ovog završnog rada su granatski amfiboliti Bistrice. Izvršena su petrografska i hemijska ispitivanja s ciljem da se odredi stepen metamorfizma, protolit ispitivanih stena i P-T uslovi nastanka. Ispitivani granatski amfiboliti geografski pripadaju Prijepolju, tačnije nalaze se na ulasku u Prijepolje, mesto Bistrica. Geološka građa obuhvata uglavnom mezozojske tvorevine među kojima se nalaze sedimentne, magmatske i metamorfne stene. Geološki procesi koji su doveli do stvaranja amfibolita su procesi subdukcije i obdukcije koji su se pretpostavljamo dešavali na većim ...
    granatski amfiboliti, Bistrica, elektronska mikrosonda, polarizacioni mikroskop