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Упит dcterms_subject_txt:Nanocrystalline material

342 items

  • Alpine thermal events in the central Serbo-Macedonian Massif (southeastern Serbia)

    Milorad D. Antić, Alexandre Kounov, Branislav Trivić, Andreas Wetzel, Irena Peytcheva, Albrecht von Quadt (2015)
    General Earth and Planetary Sciences

  • Neogena i kvartarna herpetofauna (Anura i Squamata) Srbije : doktorska disertacija

    Dragana D. Đurić (2019)
    U radu je prvi put opisan deo herpetofaune (Anura i Squamata) iz neogenih i kvartarnih lokaliteta Srbije. Obrađeni su lokaliteti Sibnica, Prebreza, Lazarevc, Vračević i Riđake, neogene starosti. Lokaliteti kvartarne starosti su pećine Mala i Velika Balanica, Pešturina, Hadži Prodanova, Baranica, Vrelska pećina i sedimentne ispune fisura u kamenolomima Venčac i Beočin. U radu je prikazana je taksonomska analiza herpetoloških ostataka. Pored taksonomske analize fosilnog materijala dat je kratak geografsko-geološki opis proučavanih lokaliteta, osnovne osteološke karakteristike anura i skvamata ...
    paleoherpetofauna, Anura, Squamata, kvartar, pleistocen, neogen, Srbija, paleoekologija, paleoklima
    ... localities were processed. The paper presents a taxonomic analysis of herpetological remains. In addition to the taxonomic analysis of fossil material, a short geographical and geological description of the studied sites, the basic osteological characteristics of the anura and squamata, as well ...
    ... 2300 samples that were classified into the 35 taxa, total of the 23 species and 9 genera from 15 families have been identified. A part of the material was determined only to the level of the family (5) and subfamily (1). For the first time in the Serbia the following taxa were described: Agama ...
    ... Delfino, M., J.C. Rage, A. Bolet, and D. M. Alba. 2013. Early Miocenedispersal of the lizard Varanus in to Europe: reassessment of vertebral material from Spain. Acta Palaeontologica Polonica, 58: 731–735. Delfino, M., Kotsakis, T., Arca, M., Tuveri, C., Pitruzzella, G., Rook, L. 2008. Agamid ...

  • Mikroelementi u uljnim šejlovima Aleksinca i njihov uticaj na životnu sredinu

    Nikoleta Aleksić (2021)
    ... uzorkovanja Pripremanje uzoraka i analitička procedura određivanja SO2 Biljni material za analizu pripremljen je sušenjem prethodno opranih listova u destilovanoj vodi, na 100 ºC do konstantne mase. Osušeni biljni material izmeren je na analitičkoj vagi (između 0,2 i 0,5 g) i spaljivan. Spaljivanje ...
    ... eliminisanje elektromagnetnih talasa određene frekvencije. Naime, stelt tehnologija je omogućila izradu tzv. električnog metamaterijala koji je veštački material tipe kompozita. Sastoji se od osnovnog materijala sa utisnutim nano kuglicama od drugog materijala. Kod ovog metamaterijala je ustanovljeno da je ...
    ... o se da se od materijala zahteva da ima negativnu masu, negativnu krutost i negativni Poasonov koeficijent. Kao što je poznato, takav prirodni material ne postoji. Međutim, moguća je izrada metastruktura po uzoru nakompozite kod kojih je fiktivna – računska masa, krutost ili Poasonov koeficijent ...

  • 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
    ... is usually operated under continuous, steady-state conditions, and a pressure difference across the membrane drives the permeation process. The material of the membrane in addition to its configuration, morphology, composition, and operating conditions are all key factors that dictate its CO- ...
    ... constituents and can surpass the current best-performing membranes. Ideas to improve composite systems by alternate chemistries, re-engineering the material systems, and processing techniques will provide critical insight into the barriers to engineering sophisticated composite systems for future ...
    ... membrane separation of CO» under a temperature of 55%. Other goases ·'· - J @·Ubt iil | |j | Figure 2.5 CO- separation using membrane material. _2 « Feed gas 55"C «~ e • ~ •a 2.4. Chemical Looping Chemical looping can be potentially cost-effective CO--capture options with minimum ...

  • Анализа рада дисконтинуалног система на основу симулације утовара и транспорта целог површинског копа

    Милош Јовановић (2024)
    У овом раду анализира се рад дисконтинуалног система утовара и транспорта на површинским коповима користећи софтверски пакет Haulsim. Циљ истраживања је побољшање ефикасности процеса транспорта и оптимизација коришћења ресурса. Симулација је спроведена за различите сценарије утовара и транспорта, укључујући варијације у броју возила, њиховој брзини, капацитету, као и рутама транспорта. Добијени резултати су показали значајне могућности за унапређење постојећих процедура и смањење трошкова. Дисконтинуални системи су сложени и захтевају пажљиву анализу како би се постигла максимална продуктивност и смањење ...
    анализа, симулација, оптимизација, ефикасност, Haulsim
    ... | Load and HaulLoading Times — Load and Cary Loading Times |___Name Adive || 'Sand with Grave! - Dry Propertes ) Sand with Gravel - Dry ” P |- Material Loader Bucket Fill Factor Coal - Anthracite I Insitu Bank Denstty 2.00| t/m? — ——— - ' Excavatability Medium - Pocr Good - Heaped - Struck ...
    ... Materials _ |} x + Properies | Loadzand Haulloading Times _ Load and Camy Loading Times Name Coal - Arthracite. Properties Sand with Gravel - Dry Material Loader Bucket Fill Factor ? | Coal - Anthracite Insitu Bank Density 1.35| t/mš : - Hxcavatability Medium to Hard d P a Rewe | —I–J ——— Heaped ...
    ... ht · Loading Unit Operation Bucket Cycle Time | 1.00| min | 60.00| s First Bucket Pass Delay | 0.10| min| 600|s li . . . Maximum Production Material Filled Capacity (icm) — Filed Payload (0 Actual Payload (t) Actual Capacity (icm) | Last Pass Cut-off(0 — | Rake(bh) » | Sand with Gravel - Dry ...

  • Towards a Mining Equipment Ontology

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... other related components, which enable the registering of realized an planned production for each day, month and year, as well as for each type of material (coal or overburden) the excavator worked with. The data on the mechanization operation are used for creating reports that show the realized and ...

  • 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)
    ... shifting on the bauxite-limestone base. The increased iron content in most of the Neogene sediments is originated partly from the deposed bauxitic material, and partly from the deposed Triassic ironaceus sandstones. 3. Characteristics of the existing structures The open pit is of a deep type with ...

  • 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

  • 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

  • Application of the VIKOR Method for Selecting the Purpose of Recultivated Terrain after the End of Coal Mining

    Radmila Gaćina, Sanja Bajić, Bojan Dimitrijević, Tomislav Šubaranović, Čedomir Beljić, Dragoljub Bajić (2024)
    reclamation, coal, sustainable development, multi-criteria decision making, VIKOR method

  • 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
    ... which is an essential element for every landslide susceptibility analysis. It is closely related to all gravitational processes, and rates of material movement are largely dependent on it. However, in the sense of measuring its potential to develop landslides, rat- ing slope inclination is not a ...
    ... debris and earth slides and rock falls. Over 60% of the occurrences have been defined as intermediate and deep, and those mostly occurred in debris material overlying hard rock masses or in fluvioglacial and proluvial sediments. The depth of some of these landslides varies in the range from 5->25–30 ...

  • 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

  • Stratigraphy and Microfauna (Radiolarians and Foraminifera) of the Upper Cretaceous (Upper Santonian–Lower Campanian) Carbonate Deposits in the Area of Struganik Village, Western Serbia)

    Liubov Bragina, Nikita Bragin, Luidmila Kopaevich, Nevenka Đerić, Nataša Gerzina Spajić (2020)
    Santonian, Campanian, radiolarians, planktonic foraminifera, biostratigraphy, limestones, Struganik, Serbia

  • A Model for Determining the Dependability of Continuous Subsystems in Coal Mines Using the Fuzzy Logic Approach

    Nikola Stanić, Miljan Gomilanović, Petar Marković, Daniel Krzanović, Aleksandar Doderović, Saša Stepanović (2024)
    This study presents a unique model for assessing the dependability of continuous parts of combined systems in open-pit mining through the application of fuzzy logic. Continuous sub-systems as part of the combined system of coal exploitation in surface mines have the basic function of ensuring safe operation, high capacity with high reliability, and low costs. These subsystems are usually part of the thermal power plant’s coal supply system and ensure stable fuel supply. The model integrates various independent partial ...
    fuzzy logic, max-min composition, continuous part of combined system (CCS), open pit, mining, dependability

  • Upravljanje proizvodnjom nafte – novi alat na bazi fazi logike

    Мирослав Црногорац, Душан Даниловић, Лола Томић (2020)
    ... n technology (IT). The state of development of electronic databases and the existing expert systems for material selection (CAMS) represent the research area of this paper. Keywords: Material, engineering, information technology, CAMS 63 miodrag ...
    ... presented in the paper. The authors start point was the belief that engineers are the most important human resource responsible for the achievements of material culture in Serbia and the world, as well as a resource credited with creating economic growth and safeguarding national security. Having in mind ...
    ... description of topology optimization of support, in other words, mass reduction with equally Von Misses stress distribution taking into account type of material, permissible load capacity as well as constraints. Optimization is conducted within Topology Study module with mass reduction of 39.8[%], compared ...

  • Indexing of textual databases based on lexical resources: A case study for Serbian

    Ranka Stanković, Cvetana Krstev, Ivan Obradović, Olivera Kitanović (2015)
    In this paper we describe an approach to improvement of information retrieval results for large textual databases by pre-indexing documents using bag-of-words and Named Entity Recognition. The approach was applied on a database of geological projects financed by the Republic of Serbia in the last half century. Each document within this database is described by metadata, consisting of several fields such as title, domain, keywords, abstract, geographical location and the like. A bag of words was produced from these ...
    ... fields in the relevant tables, the search can also be performed using specific criteria. For example, if the user chooses the criterion mineral raw material, then only the following fields in the database are taken into consideration: title, field, keywords, and abstract, while for location criterion other ...

  • Using technology for knowledge transfer between academia and enterprises

    Ivan Obradović, Ranka Stanković (2014)
    ... third objective the project will produce course materials in several different languages, in various forms such as videos, audio streams and written material. The materials will be supported by electronic terminological resources, as well as services, and search and browse functionalities. Given the ...

  • Mineral and Thermal Waters of Serbia: Multivariate Statistical Approach to Hydrochemical Characterization

    Maja Todorović, Jana Štrbački, Marina Ćuk, Jakov Andrijašević, Jovana Šišović, Petar Papić (2016)

  • Determining the Groundwater Balance and Radius of Influence Using Hydrodynamic Modeling: the Case Study of the Groundwater Source “Šumice” (Kikinda, Serbia)

    Dušan Polomčić, Dragoljub Bajić, Jelena Zarić (2015)
    A groundwater flow model was developed to simulate groundwater extraction from the public water supply source of the City of Kikinda. The hydrodynamic model includes the municipal groundwater source of Kikinda (Šumice and the Jezero Well), but also an extended area where there are groundwater sources that provide water supply to three factories: (MSK, TM and LŽT - Kikinda). Hydrodynamic modeling, based on the numerical method of finite differences will show the groundwater balance of the sources in the ...
    Water supply, Aquifer, Flow, Groundwater regime, Numerical modeling, Particle tracking
    ... groundwater source of Šumice Based on the grain-size distribution of the water-bearing horizons, which also include the studied aquifer, the material of the water-bearing formation is represented by fine- and medium-grain sands (uniformity coefficient: Cu = d60/d10 = 2-3 mm with d50 = 0.1-0.3 ...

  • 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
    ... different approaches to obtaining 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 ...
    ... different approaches to obtaining 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 ...