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Упит dcterms_subject_txt:određivanje Pb (II) and Cd(II)

2386 items

  • Praktikum za vežbe iz Informatike 1

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Mirjana Banković (2014)
    informatika

  • Elektromagnetska sprega sistema litosfera-atmosfera-jonosfera

    Aleksandra B. Kolarski (2016-08-25)
    Radio talasi vrlo niskih frekvencija VLF (eng. Very Low Frequency) frekventnog opsega od 3 do 30 kHz, koji se prostiru talasovodom Zemlja-jonosfera (50 -90 km) su, kao što je poznato, efikasni i nezamenljivi u osmatranju pojava u niskoj jonosferi, sa tla...
    prostiranje talasa vrlo niskih frekvencija, talasovod Zemlja-jonosfera, globalno električno kolo, atmosfersko električno pražnjenje, kratkotrajne svetlosne pojave
    ... 2. Obrada podataka VLF signala snimljenih sistemom AbsPAL....... 70 6.1.1. Određivanje koncentracije elektrona talasovoda u uslovima VLF poremećaja vezanih za sprajtove………………………………………….....………. 78 6.1.2. Određivanje koncentracije elektrona talasovoda u uslovima VLF poremećaja vezanih za elve ...
    ... energija 7 - 18 kHz u intervalu uzorkovanja 1.3 ms), energy_uncertainty (J) - nesigurnost prilikom određivanja enegije pražnjenja, esta - broj stanica, od ukupnog broja stanica, koje su korišćene za određivanje energije i pražnjenja i koje su od 1000 do 8000 km udaljene od samog pražnjenja. Slika ...
    ... promene faze signala, dovoljni su za određivanje promene koncentracije elektrona u talasovodu Zemlja-jonosfera, a koje nastaju kao posledica atmosferskog pražnjenja. U tu svrhu korišćen je programski paket LWPC. Postupak korišćenja ovog programa za određivanje parametara trasa VLF signala je isti ...

  • Regulacija nivoa tečne faze u vertikalnim separatorima

    Katarina Šoštarić (2024)
    Ovaj diplomski rad bavi se regulacijom nivoa tečne faze u vertikalnim separatorima u industriji nafte i gasa. U radu su istraženi različiti metodi merenja nivoa, uključujući plovke, ultrazvučne i radarske senzore. Radarski senzori su se pokazali kao najefikasniji u teškim radnim uslovima, zahvaljujući njihovoj visokoj preciznosti i pouzdanosti. Rad uključuje teoretski pregled metoda merenja nivoa, detaljno poređenje prednosti i nedostataka različitih senzora, kao i studiju slučaja implementacije radarskog senzora u vertikalnom separatoru. Analiza rezultata i preporuke za buduća istraživanja ...
    Merenje nivoa, Vertikalni separator, Radarski senzori, Ultrazvučni senzori, Industrija nafte i gasa
    ... primenljiva na određivanje nivoa tečnosti i sitnozrnastih (praškastih) materijala: Čvrsti -sitnozrnasti · „ŽČiste tečnosti materijali (sonda na dnu) (sonda u vazduhu) Razdelna površina između dve nemešljive tečnosti (sonda na površini jedne tečnosti) Slika 15. Određivanje nivoa tečnosti ...
    ... separators in the oil and gas industry. Different methods of level measurement were investigated in the paper, including floats, ultrasonic and radar sensors. Radar sensors have proven to be the most effective in difficult working conditions, thanks to their high precision and reliability. The paper ...
    ... methods, a detailed comparison of the advantages and disadvantages of different sensors, as well as a case study of the implementation of a radar sensor in a vertical separator. An analysis of the results and recommendations for future research and improvement are also presented. Keywords: Level ...

  • BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations

    Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina (2023)
    Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...

  • 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
    ... TInfluence of 4F ions on bepsin and haemoglobin conformation UV studies. The pepsin-A! and haemoglobin-AP"* interactions were followed by UV spectra. The absorption spectra of pepsin and haemoglobin in the absence and presence of 1OmM Al are presented in Figures 5 A and B. It is obvious that the ...
    ... standard potassium bromide (KBr) pallet (the ratio between pepsin and KBr and pepsin – AP? and KBr were 1:100); the pallets of haemoglobin samples in KBr were prepared in the same manner. Infrared spectra between 4000 and 400cm ! obtained on a Specord 75 IR, Carl Zeiss in double-beam operation ...
    ... concentrations of AP? ion (1, 5 and 10mM). "The samples of pepsin and haemoglobin were diluted with sample buffer in ratio 1:1 (v/v) and applied on gel in volume of 20 uL. Visualization was performed with Commassie Brilliant Blue G-250 dye. The gels scanned and processed using Corel Draw 11.0 ...

  • Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining

    Vladimir Čebašek, Veljko Rupar, Stevan Đenadić, Filip Miletić (2021)
    Geology,Geotechnical Engineering and Engineering Geology
    ... High-strength rocks Solid and tough quartz and basalt 20 200 II Very hard rocks Porphyritic quartz, granite 15 150 III Hard rocks Granite, hard sandstone, hard iron ore 10 100 IV Relatively hard rocks Normal sandstone, iron ore 6 60 V Medium hard rocks Hard clay slate, soft sandstone, and limestone 4 40 VI ...
    ... Validation, V.R., S.Ð., and F.M.; Formal analysis, V.R.; Investigation, V.Č. and V.R.; Resources, V.Č. and V.R.; Data curation, V.R., S.Ð., and F.M.; Writing—original draft preparation, V.Č.; Writing—review and editing, V.R.; Visualization, S.Ð. and F.M. All authors have read and agreed to the published ...
    ... FL—lateral, and FFT—forward thrust). In the past, the relationship between digging material and specific digging resistance for wheel operation has been analyzed both theoretically and practically. The most critical researchers have been Himmel, Limbrek and Marcelli, Brach, Dombrowski, and Kubec [1,14] ...

  • A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System

    Miljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić (2023)
    This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...
    системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFIS

  • Fuzzy Model for Risk Assessment of Machinery Failures

    Dejan V. Petrović, Miloš Tanasijević, Saša Stojadinović, Jelena Ivaz, Pavle Stojković (2020)
    The main goal of this research was the development of an algorithm for the implementation of negative risk parameters in a synthesis model for a risk level assessment for a specific machine used in the mining industry. Fuzzy sets and fuzzy logic theory, in combination with statistical methods, were applied to analyze the time picture state of the observed machine. Fuzzy logic is presented through fuzzy proposition and a fuzzy composition module. Using these tools, the symmetric position of the ...
    fazi teorija, rizik, otkaz rudarskih mašina
    ... [CrossRef] 19. Kraidi, L.; Shah, R.; Matipa, W.; Borthwick, F. Using stakeholders’ judgement and fuzzy logic theory to analyze the risk influencing factors in oil and gas pipeline projects: Case study in Iraq, Stage II. Int. J. Crit. Infrastruct. Prot. 2020, 28, 100337. [CrossRef] 20. Ataei, M.; Khalokakaie ...
    ... employees, and environment, even with proper monitoring and maintenance systems. Previous research in the field of risk and reliability has offered different approaches and various models, but there have been some common goals: the identification of critical elements in the system, subsystems, and assemblies; ...
    ... sets and fuzzy logic in risk assessments is presented in Section 2. The procedures, algorithm, and methodology are described in Section 3. Section 4 presents the Case Study, and the Results and Discussion are given in Section 5. Finally, Conclusions are given in Section 6. 2. Fuzzy Set and Fuzzy ...

  • Stratigraphy and microfossils (radiolarians and planktonic foraminifers) of the Upper Cretaceous (upper Santonian–lower Campanian) Struganik limestone (Western Serbia)

    Liubov G. Bragina, Nikita Yu. Bragin, Ludmila F. Kopayevich, Nevenka Đerić, Nataša Gerzina Spajić (2019)
    Paleontology, Stratigraphy, Ecology, Evolution, Behavior and Systematics

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction
    ... with the lime content and the control sample is calculated and is 0,966, and with the cement content and the control sample is 0,954. After the calculated coefficient values it is found that the samples with the lime and the cement belong to the very strong correlation group and differ by 1 %. ...
    ... that contain the cement and the lime as the binder (of 2, 4 and 6 %) and with the control sample (100 % of the ash). The linear dependence was made for all variants, and after that the correlation coefficient was calculated. The correlation coefficient is characterized and classified in the specific ...
    ... strength and the modulus of elasticity are obtained in the samples that contain the cement as the binder, while the samples with the lime have lower values (Fig. 8). The correlation coefficient with the cement content and the control sample is calculated and is 0,990, and with the lime content and the ...

  • 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
    ... (Renewable energy sources), Volume II-2, pp. 204 - 209. PBC GIS, 2019. Site Modeling in Context - Obtaining And Transforming Elevation Data, pbc Geographic Information Services, available at: http://wwWw.pbcgis.com/dem/. Republic of Serbia, Ministry of Mining and Energy, 2018. Energy balances for ...
    ... energy, and energy in biomass and · fossil fuels, · captured · through photosynthesis. For the purpose of heating and electricity production, the application of solar panels (solar thermal panels for heating: water and PhotoVoltaic (PV) solar panels for electricity 325 production) and the ...
    ... M., 2000): • Versatile output: calculates direct, diffuse, global radiation, and direct radiation duration, sun maps and sky maps, and viewsheds; Simple input: requires only DEM, atmospheric transmissivity, and diffuse proportion; Flexibility: — calculates insolation for any: i) specified ...

  • Развој хибридног модела за оптиматизацију завршне контуре одлагалишта у површинској експлоатацији лежишта минералних сировина

    Aлександар Додеровић (2024)
    Површинска експлоатација минералних сировина захтијева претходно откопавање значајних( милионских) количина јаловине, које је неопходно транспортовати до локације на којој ће сеона трајно одложити. Традиционални приступ избора локације и дизајна одлагалишта се карактерише парцијалним приступом, заснованом на анализи неколико водећих критеријума као и на личном искуству инжењера, често занемарујући синергетски ефекат осталих утицајних фактора Технолошке операције које се односе на манипулацију јаловином, међу којима предњачи транспорт, генеришу највећи дио трошкова у површинској експлоатацији. Такође, цјелокупан процес експлоатације додатно је ограничен ...
    оптимизације завршне контуре одлагалишта, хибридни модел, површинска експлоатација, генетски алгоритам

  • The Nooj System as Module within an Integrated Language Processing Environment

    Ranka Stanković, Duško Vitas, Cvetana Krstev (2008)
    NooJ, electronic dictionary, lexical resources
    ... framework (LMF), (2006), ISO/TC 37/SC 4 N130 Rev.9, ISO CD 24613:2006. Krstev C., Pavlović-Lažetić G., Vitas D., Obradović I.: Using Textual and Lexical Resources in Developing Serbian Wordnet. Romanian Journal of Information Science and Technology, Romanian Academy, Publishing House of the ...
    ... Mathematics, University of Belgrade, and is aimed at manipulating heterogeneous lexical resources developed in the course of many years and within different projects. The tool handles morphological dictionaries, wordnets, aligned texts and transducers and has already proved very useful for various ...
    ... years, and it is understandable that they have been conceived within different projects and frameworks, both from the conceptual and the technological perspective. Despite that the HLT group made every reasonable effort to keep the constantly growing pool of resources as coherent and standardized ...

  • Palinomorfe sa lokaliteta Gostuška reka (Stara planina)

    Ivan Rutović (2024)
    U radu su prikazani rezultati palinološkog istraživanja permsko-trijaskih sedimenata sa lokaliteta Gostuška reka. Palinološki kompleksi su detaljno analizirani, što je omogućilo morfološku, taksonomsku i paleoekološku identifikaciju palinomorfi. Istraživanje je pokazalo prisustvo velikog broja spora i polena golosemenica, dok je polen skrivenosemenica zastupljen u manjem procentu. Na osnovu paleoekoloških analiza, zaključeno je da je tokom formiranja sedimenata na lokalitetu vladala aridna klima, sa povremenim vlažnim fazama koje su omogućavale razvoj močvarne vegetacije.
    palinomorfe, paleoekologija, perm - trijas, Stara planina, Gostuška reka
    ... range (Hungery) and the Vicentinian Alps (Htaly). — Unpubl. Ph. D. thesis, State Univ. Utrecht, 95 p. 34 Cassinis, G., di Stefano, P., Massari, F., Neri, C. & Venturini, C. 2000: Permian of south Europe and its interregional correlation. (In: Permian-Triassic Evolution of Tethys and Western C ...
    ... Roberta Branz, Christoph Hartkopf-Freder, Nuskoisporites dulhuntyi from the Cisuralian and Lopingian of the Southern Alps: A morphological comparison between dispersed and in situ prepollen. Review of Palaeobotany and Palynology, Volume 329. https://doi.org/10.1016/J.revpalbo.2024.105157. eyfullah ...
    ... Permian palaeobotany and palynology. XVII. Conifer extinction in Europe at the Permian-Triassic junction: Morphology, ultrastructure, and geographic/stratigraphic distribution of Nuskoisporites dulhuntyi (prepollen of Ortiseia, Walchiaceae). Review of Palaeobotany and Palynology, Vol. 97, p ...

  • Spatial assessment of the areas sensitive to degradation in the rural area of the municipality Čukarica

    Natalija Momirović, Ratko Kadović, Veljko Perović, Miloš Marjanović, Aleksandar Baumgertel (2019)
    Nature and Landscape Conservation, Soil Science, Agronomy and Crop Science, Water Science and Technology

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... ignited by inserting a hot coke through the borehole and blowing the low pressure air. Instead of firing coal layer with the coke at high temperatures, a – — —- 225 – — — Product gas W j ii manifold 75 75 i 75 H ' · H I Drilling -—Q - and preparing || ' Row5 _ ć____ O—- Boreholes ! ...
    ... activated, and the coke burns the surrounding coal and forms the reaction zone. Exothermic reactions (at f > 600 "C) are predominantly occurring in UCG process, and the resulting gas mixture can contain 8-20% CO», 5-20% CO, 10-20% H», and 2-5% CHoa. Ifthe gas mixture contains too much CO., and possibly ...
    ... from the gas mixture of UCG, and its possible storage carbon capture and storage, depends on the technological development of the separation and storage of CO [3]. Syngas can be used to produce a number of usable products, such as electricity, liquid fuels and chemical raw materials. The com ...

  • Geodynamics of basins above subducted slabs: An integrated modelling study of tectonics, sedimentation, and magmatism in the Timok Magmatic Complex

    Uros Stojadinovic, Marinko Toljic, Branislav Trivic, Radoje Pantovic, Danica Sreckovic-Batocanin, Nemanja Krstekanic, Bojan Kostic, Milos Velojic, Jelena Stefanovic, Nikola Randjelovic, Maja Males (2024)
    Timok Magmatic Complex, Neotethys subduction, basin geodynamics, analogue modelling

  • Results of Recent Monitoring Activities on Landslide Umka, Belgrade, Serbia—IPL 181

    Biljana Abolmasov, Uroš Đurić, Jovan Popović, Marko Pejić, Mileva Samardžić Petrović, Nenad Brodić (2021)
    Klizišta, Monitoring, GNSS, Geodetska osmatranja, UAV snimci, PSInSAR
    ... such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher ...
    ... measure- ments, geodetic benchmark survey monitoring, UAV imaging, processing and analysis, and PSInSAR data processing and analysis. Results of all monitoring activ- ities were analysed and used for cross-correlation and for verification of monitoring results obtained from different techniques. ...
    ... photogrammetric processing and analysis, and PSInSAR data processing and analysis. The main goals for introducing new monitoring techniques were: (1) to increase the number of surface monitoring points, (2) to test accuracy of existing and newly introduced monitoring techniques and (3) to compare monitoring ...

  • Hidrogeohemija prirodnih radioaktivnih elemenata u podzemnim vodama Srbije

    Marina D. Ćuk (2018-02-23)
    Osnovni cilj doktorske disertacije predstavljao je definisanje prirodnih koncentracija (engl. background values) U, Th, i K u podzemnim vodama, i definisanje hidrogeohemijskih uslova koji utiču na distribuciju navedenih elemenata u podzemnim vodama...
    prirodni radioaktivni elementi, podzemna voda, geohemijske sredine, hidrogeohemijski uslovi, neparametarska statistička analiza, logistički model, hidrohemijsko modeliranje
    ... units in Ograzhden and Belasitsa Mountains, Serbo-Macedonian Massif (SW Bulgaria): combined geochemical, petrological and U-Pb zircon-xenotime age constraints. Geologica Balcanica 44: 51 – 84. 130. Pili A, Ricard Y, Lardeaux JM, Sheppard SMF. 1997. Lithospheric shear zones and crust-mantle connections ...
    ... Sons Inc, New York. 106. McMahon PB, Chapelle FH. 2008. Redox processes and water quality of selected principal aquifer systems. Ground Water 46: 259 – 271. 107. McManus SL, Richards KG, Grant J, Mannix A, Coxon CE. 2014. Pesticide occurrence in groundwater and the physical characteristics in ...
    ... ionim uslovima. Kako se radi o nestabilnom fizičko-hemijskom parametru, određivanje koncentracija ukupnog Fe i rastvorenog O2 u podzemnim vodama mogu biti dodatni indikatori oksido-redukcionih uslova u izdani (McMahon and Chapelle 2008, Wright et al. 2014). Na osnovu koncentracija Fe i O2, merenih ...

  • 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
    ... Pinto A P, Van Bos M (2004) Methods and approaches in stone conservation: analysis of an enquiry. In: Stockholm, Kwiatkowski D and Lofvendahi R (ed) IOth International congress on deterioration and conservation of stone, Preprints, ICOMOS Sweden, Vol. II, Elanders Gotab, Stockholm, pp 691698 ...
    ... 1997a, b, Hein- richs and Fitzner 2000, 2007; Fitzner and Heinrichs 2002; Rothert et al. 2007). Also, it was used as reference for a number of researches on techniques for assessment of stone decay (Ball and Young M 2000; Turkington and Smith 2004; Kukela and Seglins 2011). Based on quantitative ...
    ... damage indices (Fitzner and Heinrichs 2002). Pro- posed linear and progressive damage indices and mapping results enable: @ Springer Environ Earth Sci (2015) 73:6181–6193 Quantification of damage intensities and damage cat- egories that allow conclusive quantification and rating of stone damage ...