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Упит dcterms_subject_txt:surface functional groups

277 items

  • Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

    Marija Živković, Dejan Ivezić (2021)
    Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...
    рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија
    ... evaluation of some effects that could be obtained through its full utilization for heat production in the existing district heating systems. Three groups of indicators are selected for analysis focusing on district heating systems’ energy performance (primary energy factor, specific heat consumption ...
    ... 1 3 Key performance indicators For the evaluation, comparison and analysis of the current and possible state of district heating systems, three groups of indicators are selected focusing on energy performance, energy supply, and environmental impact. Energy performance The primary energy factor ...
    ... are mainly fueled by a domestic energy source: coal. Values of the Shannon–Wiener index point out unfavorable diversification of fuel mix for both groups of DH systems. The weaknesses of the first group of DH systems are high import dependency and unfavorable diversification of fuel mix. Although the ...

  • A Description of Morphological Features of Serbian: a Revision using Feature System Declaration

    Cvetana Krstev, Ranka Stanković, Vitas Duško (2010)
    In this paper we discuss some well-known morphological descriptions used in various projects and applications (most notably MULTEXT-East and Unitex) and illustrate the encountered problems on Serbian. We have spotted four groups of problems: the lack of a value for an existing category, the lack of a category, the interdependence of values and categories lacking some description, and the lack of a support for some types of categories. At the same time, various descriptions often describe exactly the same ...
    Morphology, Lexicon, lexical database, Standards for LRs
    ... various projects and applications (most notably MULTEXT-East and Unitex) and illustrate the encountered problems on Serbian. We have spotted four groups of problems: the lack of a value for an existing category, the lack of a category, the interdependence of values and categories lacking some description ...

  • Groundwater gravitational circulation of Karst Veliko Vrelo and Malo Vrelo springs by isotope and the noble gas method: case study of the Beljanica Massif

    Ljiljana Vasić, Laszlo Palcsu, Huang Fen (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry

  • Late and post-collisional tectonic evolution of the Adria-Europe suture in the Vardar Zone

    Emő Márton, Marinko Toljić, Vesna Cvetkov (2022)
    The Vardar Zone is a product of the Triassic-Jurassic opening of the Neotethys, Jurassic obduction, Late Cretaceous/Paleogene consumption of the oceanic crust and continental collision. During the last process, the Eastern Vardar Zone was thrust over the Central and eventually both onto the Western Vardar Zone. The present paleomagnetic and structural study provided new results from the first two zones in the Belgrade area. The younger set of data, together with published ones from the third zone, provide firm ...
    Adria–Europe suture, Vardar Zone, Paleomagnetism, Thrusting, Vertical axis rotation

  • Развој геолошког терминолошког речника ГеолИССТерм

    Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić (2011)
    ... work on the dictionary continued after the project ended and the current version containing around 3800 concepts in Ser- bian and english is a functional geologic termi- nology resource that will be capable of meeting the needs of the geologic Information System of Serbia – geolISS (Blagojević, 2007) ...
    ... entities. however, the flexibil- ity of structure allows the possibility of rear- ranging the content, forming new semantically or thematically related groups, as well as sort- ing and searching the content using different criteria. every entry contains a name, i.e. the term it- self, its definition, as ...
    ... identified by lithic characteristics and stratigraphic position; it is prevailingly, but not necessarily, tabular and is map- pable at the earth’s surface or traceable in the subsur- face (NAcSN, 2005). Synonyms (English): none References: North American Stratigraphic code grupa autora 2005. AAPg; ...

  • Kinetics, mechanism, and equilibrium studies of the reactions between a ruthenium(II) complex and some nitrogen- and sulfur-donor nucleophiles

    Aleksandar M. Mijatović, Ratomir M. Jelić, Jovana Bogojeski, Živadin D. Bugarčić, Biljana Petrović (2013)
    Kinetika i mehanizam reakcija supstitucije između [Ru(trpi)(bpi)Cl]+ sa nukleofilima gvanozin-5′-monofosfatom, L-histidinom, tioureom i dimetilsulfoksidom proučavani su spektrofotometrijski u 0,1 M NaClO4 na 310 K. Red reaktivnosti za odabrane ligande je: tiourea > gvanozin-5′-monofosfat > L-histidin > DMSO. Ovaj red je povezan sa elektronskim, strukturnim i hemijskim karakteristikama kompleksa i nukleofila. Reakcija supstitucije sa tioureom je proučavana na tri različite temperature (288, 298 i 310 K). Negativna entropija aktivacije DS = potvrđuje asocijativni način aktivacije. Formiranje kompleksa [Ru(trpi)(bpi)H2O]2+ sa ligandima ...
    Kinetika, Ravnoteža, Ru(II), L-Histidin, Guanozin-5' -monofosfat, Dimetilsulfoksid, Tiourea
    ... structural, and chemical characteristics. The associative mode of substitution is confirmed for the substitution reaction with Tu. The mono- functional complex [Ru(trpy)(bpy)Cl]? with 50-GMP and L-His forms very stable products, especially with 50-GMP. Finally, knowledge of the composition and ...
    ... product formed usually undergoes isomerization to an N7 bounded form. L-His could be coordinated to metal ions via amino, imidazole, and car- boxylate groups. In biological systems, there are numerous metalloproteins in which metal ions are bound to an L-histidine through N1 or N3 atoms of imidazole. However ...

  • Classification of Terms on a Positive-Negative Feelings Polarity Scale Based on Emoticons

    Mihailo Škorić (2017)
    The goal of this paper is to draw attention to the possibility of using emoticon-riddled text on the web in language-neutral sentiment analysis. It introduces several innovations in the existing framework of research and tests their effectiveness. It also presents a software tool especially made for that purpose, explains how it builds a database with sentimental value of terms and offers the user manual. Finally, it presents a software tool that tests the new database and gives some examples ...
    data mining, information extraction, emotions, text on the web
    ... transformation deletes all tokens containing less than two char- acters (assuming they do not carry any meaning, because they either represent a non-functional word or were created by breaking large char- acter strings such as hyperlinks), and all the tokens that contain more than twenty characters (assuming ...
    ... Possible applications This method of determiner extraction and generally similar researches can find a wide variety of applications divided into two groups. Social and demographic research: – Marketing research: exploration of current vs alternative approach to the marketing of products and services ...

  • Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)

    Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić (2021)
    This paper presents the first data on the organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in the East Herzegovina region of the External Dinarides. Representative, organic-rich samples from outcropping sedimentary rocks of different ages in the area (Triassic to Neogene) were selected and analysed. The organic matter was studied by Rock-Eval pyrolysis and under the microscope in reflected non-polarized light and incident blue light. The results obtained show the presence of different types of organic ...
    nafta i gas, Rock-Eval, refleksija vitrinita, maceral, termička zrelost
    ... rock) released at 300 ºC; S2 – HC generated during pyrolysis (mg HC/g rock) from 300 to 650 ºC; S3 – amount of CO 2 generated from oxygenated functional groups (mg CO2/g rock); HI – hydrogen index = (S2 x 100)/TOC; mg HC/g TOC); T max – temper- ature of peak HC generation (ºC). 4 N. ALEKSIC ET AL. The ...
    ... rock) released at 300 °C; S2 — HC generated during pyrolysis (mg HC/g rock) from 300 to 650 °C; S3 — amount of CO? generated from oxygenated functional groups (mg CO?/g rock); HI — hydrogen index = (S2 x 100)/TOC; mg HC/g TOC); T max — temper- ature of peak HC generation (°C). 5COMPOSITION OF ORGANIC ...
    ... lower T max values. In addition, the results of pyrolysis documented before and after extraction revealed that free hydrocarbons (bitumen) in the surface samples analysed suppress the T max values. Key words : Petroleum, Rock-Eval, vitrinite reflectance, maceral, thermal maturity. Manuscript received ...

  • 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
    ... as surface recession and relief, only occasionally as outburst. Black crusts and white calcite crusts are present on majority of the stone blocks on the south facade. While black crusts are the ones that provoke surface recession, white crusts are thin and uniformly cover the surface of stone ...
    ... and noting present categories of weathering forms according to groups, main and individual weathering forms and damage categories. Final damage categories were derived by jointly considering all weath- ering forms of the four groups. The selected damage cat- egories are: very slight damage (1) ...
    ... stone degradation according to the type and intensity. It showed that all five groups of damage cate- gories are present on built stone blocks i.e., category “no visible damage” was not observed. As far as groups of weathering forms are concerned, most dominant are loss of stone material, deposits ...

  • A fuzzy-based decision support model for effectiveness evaluation - a case study of examination of bulldozers

    Miloš Tanasijević, Predrag Jovančić, Dejan Ivezić, Uglješa Bugarić, Radiša Đurić (2019)
    Effectiveness evaluation is one of the basic components of engineering asset management and maintenance engineering in general. Effectiveness is an overall concept representing a measurement of quality of service level for the analyzed engineering system. This concept contains a series of partial indicators relating to time in operation and time for maintenance activities, as well as functional properties of the system. This article describes the analysis and structuring of partial indicators, as well as the development of a model ...
    Efikasnost, Fazi zaključivanje, Prikupljanje podataka, Buldozer

  • 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,

  • Flyrock Induced by Blasting in Surface Mining

    Milanka Negovanović, Lazar Kričak, Snežana Ignjatović, Stefan Milanović, Jovan Marković, Nikola Simić, Rade Šarac (2022)
    Минирање представља и даље најефикаснији и најјефтинији начин експлоатације великих количина чврстих минералних сировина на површинским коповима. Енергија експлозије се користи за фрагментацију чврсте стенске масе до захтеване гранулације. Поред позитивних ефеката минирања, постоје и одређени нежељени ефекти сваког процеса минирања који се могу јавити, а то су: потреси тла, разлетање комада стене, ваздушни удари, отровни и загушљиви гасови и прашина. Разлетање комада стене је неконтролисано избацивање фрагмената одминиране стенске масе и представља један од главних извора материјалне ...
    разлетање, бушење, минирање, површинска експлоатација, безбедност, несрећа

  • Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels

    Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković (2023)
    drilling fluid formulation, upstream oil and gas, fluid dynamics, fluid loss control, gel

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

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... bio-molecules that play significant roles in plant metabolism (thorough displacement/ substitution of essential elements or by binding to important functional groups). As a general effect of heavy metal toxicity, the production of reactive oxygen species (ROS) begins (Nagajyoti et al. 2010; Rascio and ...
    ... Prevention in Novi Sad municipality, Serbia,” a preliminary screening of the Danube surface water near Novi Sad was conducted. The results indicated presence of more than 150 different organic pollutants from the groups of industrial emerging and priority pollutants (Vojinović Miloradov et al. 2014) ...
    ... been investigated by several scientific groups. The contents of 16 organochlorine pesticides were analyzed in the city of Novi Sad, the capitol of Vojvodina Province (North of the Serbia) by Skrbic at al 2007. The pesticides were determined in the surface zone (0-5 cm) of soil and sediment samples ...

  • Mine ventilation system planning using genetic algorithms

    Nikola Lilić, Ranka Stanković, Ivan Obradović (1997)
    The most common problem in contemporary mining practice related to the planning and analysis of ventilation systems is the optimization of partially regulated air distribution in mine ventilation networks. This paper presents a two step optimization procedure for partly regulated air distribution in mine ventilation networks. The first step is the determination of air distribution in all branches using the well known Hardy-Cross method. In the second step the distribution and parameters of air flow regulators with minimum engaged ...
    coal, lignite, and peat; ventilation systems; coal mining; underground mining; ventilation; mathematical models; design; air flow; optimization; calculation methods

  • Atmospheric exposure vs burying: influences on damage intensity of built-in kersantite in the monument of the Small Staircase (Belgrade, Serbia)

    Nevenka Novaković, Predrag Dabić, Vesna Matović (2023)
    Proučavan je efekat „zatrpanog kamena“ na intenzitet procesa degradacije prisutnih na kersantitu koji je ugrađen u spomenik Malo stepenište. Istraživanja su vršena na uzorcima stene iz kamenoloma i na oštećenim kamenim blokovima ugrađenim u spomenik. Dok su neki delovi stepeništa bili pod zemljom 90 godina, većina kamenih elemenata je bila izložena različitim uslovima sredine i antropogenim uticajima. Urađeno je detaljno mapiranje trenutnog stanja spomenika kako bi se istražio uticaj “zatrpavanja” i kompleksne geometrije spomenika na tip propadanja i variranje ...
    Raspadanje, Indeks oštećenja, Zatrpavanje, Fizička svojstva, Kersantit

  • Long-term planning methodology for improving wood biomass utilization

    Vladimir Vukašinović, Dušan Gordić, Marija Živković, Davor Koncalović, Dubravka Živković (2019)
    The insufficiently developed forest management system is often followed by undeveloped forest resources supply chain and insufficient institutional support. These cause inefficient usage of fuel-wood as well as huge amounts of unused forest residues. In order to achieve optimal and long-term sustainable utilisation of biomass, an original methodology based on the interaction of mathematical optimization and backcasting approach has been developed. Mathematical optimization is used for both generation and consideration of techno-economic parameters of the forest biomass supply chain. ...
    Long-term planning methodology, Forest biomass, MINLP, Backcasting

  • Phase relations and physical indicators of municipal waste from old landfills in Serbia

    Dragoslav R Rakić, Irena G Basarić Ikodinović, Jovana M Janković, Tina D Đurić (2021)
    Due to certain similarities of municipal waste and soil, usually for the determination of basic parameters of physical state, laboratory and field tests which are common in geotechnical investigations are used. It is often to construct an apparatus for special purpose to perform some specific laboratory and field tests. Therefore, different values of indicators of municipal waste physical state can be found in the literature. The basic reasons should be found in different definitions and methods that researchers use ...
    municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosityGeneral Computer Science
    ... Keywords: municipal waste, moisture content, unit weight, specific gravity, grain size distribution, porosity. 1 INTRODUCTION of material for specific groups that are published by different authors, EU member countries have developed and proposed formal method for the waste composition definition called ...
    ... classification of municipal waste should be performed, according to a specially prepared catalogue, which contains 12 mandatory categories - groups, and 35 subcategories (secondary categories). This paper uses this catalogue according to which the https://doi.org/10.3208/jgssp.v09.cpeg016 105 ...

  • Хазард од клизишта у Србији у 21. веку

    Biljana Abolmasov (2019)
    клизишта, хазард од клизишта, промене климе
    ... warning system for rainfall-induced shalow fail Geology 73 (3/4): 247� 265. [27] IPCC, 2014: Climate Change 2014: Synthesis Report. Contribution o Groups I, II and III to the Fifth Assessment Report of the Intergov 86 [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] ...
    ... (2004). A warning system for rainfall-induced shalow fai Geology 73 (3/4): 247 265. IPCC, 2014: Climate Change 2014: Synthesis Report. Contribution Groups I, II and III to the Fifth Assessment Report of the Interge 87������ �� ›������� � ������ � 21. ��›� on Climate Change [Core Writing Team, R.K ...

  • Project BEWARE—Landslide Post-disaster Relief Activities for Local Communities in Serbia

    Biljana Abolmasov, Dobrica Damjanović, Miloš Marjanović, Ranka Stanković, Velizar Nikolić, Sandra Nedeljković, Žarko Petrović (2017)
    ... on higher (potentially national) levels, periods (sustainability), and purposes (e.g. potential early-warning prototyping). Potential additional functional- ities and prototypes on GIS web portal. WP10—Follow-up—Concluding the project by replicating a meeting with WP2 protagonists and presenting the ...