Претрага
519 items
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Doprinos proučavanju mehanizovane izrade pripremnih radova u uglju u vezi mehanizovanog otkopavanja horizontalnih i blago nagnutih ležišta
Dragoljub Đokić (1965)Dragoljub Đokić. Doprinos proučavanju mehanizovane izrade pripremnih radova u uglju u vezi mehanizovanog otkopavanja horizontalnih i blago nagnutih ležišta, Beograd:Rudarsko Geološki Fakultet, 1965
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Ispitivanje prirode hemijske veze i osobina fotoelektronskih i mekih rentgen-emisionih spektara sumpora u jedinjenjima hidrotermalnih ležišta
Ivan Gržetić (1984)Ivan Gržetić. Ispitivanje prirode hemijske veze i osobina fotoelektronskih i mekih rentgen-emisionih spektara sumpora u jedinjenjima hidrotermalnih ležišta, Beograd:Rudarsko Geološki Fakultet, 1984
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Primena savremene tehnologije u rudarskim merenjima pri podzemnom otkopavanju ležišta
Čedomir Cvijović (2010)Čedomir Cvijović. Primena savremene tehnologije u rudarskim merenjima pri podzemnom otkopavanju ležišta, Beograd:Rudarsko Geološki Fakultet, 2010
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The analysis of the geothermal energy capacity for power generation in Serbia
Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)... temperature is extensively used as a geothermometer in examinations of geothermal resources. In addition to temperature, SiO2 sol- ubility is affected by acidity/alkalinity of solu- tions and a variety of the salts present. Silica is rapidly dissolving in water of low pH values, such as pit water or ...
... equations, which indicated potential of the hydrogeothermal resource. The first to be implemented was silica geothermometer based on quartz solubility; sol- ubility in water of different silica forms (quartz, chalcedony, and amorphous silica) were mea- sured in relation to temperature and pressure. This ...
... equations, which indicated potential of the hydrogeothermal resource. The first to be implemented was silica geothermometer based on quartz solubility; sol- ubility in water of different silica forms (quartz, chalcedony, and amorphous silica) were mea- sured in relation to temperature and pressure. This ...Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk. "The analysis of the geothermal energy capacity for power generation in Serbia" in Thermal Science, National Library of Serbia (2013). https://doi.org/10.2298/TSCI120215033S
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Quantitative landslide risk assessment in the city of Tuzla
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 – ...... 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 ...
... range. ● Distance-based vulnerability assessment: producing map of distance from the zone of high (H) susceptibility outward; inversing the value so that adjacent areas are penalized with highest scores, while remote areas receive smallest distance values (the closer pixel is to the H zone higher ...
... together. Proposed SVM technique requires separation of nominal classes, given in the original and aggregated map, into sets of binary variables, so that each class gives a new sub-variable. For instance, engineering geological units were segregated into 9 sub-variables (9 new rasters), that are ...Miloš Marjanović, Biljana Abolmasov, Cvjetko Sandić, Miralem Mulać, Petar Begović. "Quantitative landslide risk assessment in the city of Tuzla" in SCG-Xiii International Symposium on Landslides. Cartagena, Colombia- February 22-26, 2021, International Society for Soil Mechanics and Geotechnical Engineering (2021)
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Control of substructure construction of railways in the Republic of Serbia
Контрола збијености природног тла (у ископу) или збијеног у насипу при изградњи саобраћајница представља један од основних облика контроле квалитета доњег строја. Код изградње брзих саобраћајница (аутопутеви и брза железница) приоритет је постизање високог нивоа контроле извршених радова. У циљу онемогућавања диференцијалног слегања (при изградњи насипа), или промене запремине услед допунског збијања материјала, које неминовно доводе до деформација, потребно је извршити оптимално збијање материјала. У оквиру овог рада приказује се техничка регулатива која регулише контролу збијености при изградњи железничке ...... ratio Ev2/ Ev1 less than the minimum value prescribed for Ev2. The protective layer as a filter must have water permeability, and the flow rate cannot be so high that the particles are washed away. To achieve this: the diameter of the grain belonging to the ordinate 15% of the granulometric curve of the ...
... Also, when testing with a light drop weight, the required moisture is not checked, and testing of layers is not performed in the same height profile, so the obtained results cannot be compared by layers. This practice of compaction control and substructure construction is not in line with existing ...
... degree of unevenness, coefficient of water resistance (for protective layer) . In the Republic of Serbia, this test method is not yet standardized (so the ASTME 2835 standard is used) and can be applied only in correlation with standardized methods. According to the provisions of the mentioned Instruction ...Dragan Lukić, Dragoslav Rakić, Irena Basarić Ikodinović. "Control of substructure construction of railways in the Republic of Serbia" in International Conference On Contemporary Theory and Practice in Construction XV, Banja Luka 16-17 jun 2022., University of Banja Luka Faculty of Architecture, Civil Engineering and Geodesy (2022)
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Environmental Energy Security Indicators as Tools for Environmental Protection
Еколошка прихватљивост је постала незаменљив синтезни показатељ сваке валидне енергетске анализе у последње две-три деценије. Енергетска безбедност је у директној хармонији с еколошком прихватљивошћу кроз многе прописане политичке циљеве, економске користи, правне тековине итд. Индикатори еколошке сигурности представљају један од основних елемената за одређивање енергетске безбедности и снажне алате за усмеравање енергетског сектора ка одрживом развоју. У овом раду, анализа је била концентрисана на показатеље енергетске безбедности у области животне средине који се односе на сектор природног гаса у ...енергетска безбедност, еколошки енергетски индикатори, заштита животне средине, еколошка прихватљивост... and worked environment, called externalities. These effects can differently affect the so-called neighboring economic activities, while at the same time bringing some additional costs and benefits to others - the so-called negative and positive externalities [22]. In the context of environmental ...
... for monitoring for each country facing major energy changes. Energy security is a parameter whose specificity lies in the influence of many factors, so it is not possible to define a unique methodology for determining it [1]. Namely, each country brings into consideration some specificity and its ...
... chemical composition of the energy that it burns. Their contribution to the emission of greenhouse gases, primarily carbon dioxide, is not the same, so a carbon dioxide emission factor k (CO2) is introduced for the purposes of comparable energies. This coefficient expresses the amount of CO2 emitted ...Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević. "Environmental Energy Security Indicators as Tools for Environmental Protection" in Mining and Environmental Protection-MEP 2019, University of Belgrade, Faculty of Mining and Geology (2019)
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The Nooj System as Module within an Integrated Language Processing Environment
... handles morphological dictionaries, wordnets, aligned texts and transducers and has already proved very useful for various tasks. Although it has so far been used mainly for Serbian, WS4LR is not language dependent and can be successfully used for resources in other languages provided that they ...
... these resources, and to enable the merging of large numbers of different individual electronic resources to form large global electronic resources, so conversion of NooJ resources to LMF format (Lexical markup framework) (ISO LMF 2006) is also included in this environment. 3. Lexical resources ...
... section introduces different ways to expand a query: morphologically, semantically, in another language. Serbian language has a rich morphology, so simple string matching can rarely fulfill user demands. Also, the possibility of semantic extension, namely, a search by concept instead of by single ...Ranka Stanković, Duško Vitas, Cvetana Krstev. "The Nooj System as Module within an Integrated Language Processing Environment" in Proceedings of the 2007 International Nooj Conference, Cambridge Scholars Publishing (2008)
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Convective heat transfer in centrifugal pumps lifted wells: the case of South-Eastern Europe waxy wells
Electric submersible pumps (ESP) are applied in wells where additional energy is needed to ensure discharge of the fluid to the surface through the tubing. At the discharge side of the pump the fluid has bigger velocity, thus the pump induces a forced convection between the fluid and the tubing inner surface. Understanding of convective heat transfer in wellbores and analyses of influential parameters provides a possibility to optimise value of convective heat transfer coefficient in order to avoid ...Bojan Martinovic, Marija Živković, Branko Grubač. "Convective heat transfer in centrifugal pumps lifted wells: the case of South-Eastern Europe waxy wells" in International Journal of Oil, Gas and Coal Technology, Inderscience Publishers (2021). https://doi.org/10.1504/IJOGCT.2021.10043281
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Serbian ELTeC Sub-Collection in Wikidata
This paper presents an example of integration of Wikidata with digital libraries and external systems, as well as some best practices for speeding up the process of data preparation and import to Wikidata, on the use case of SrpELTeC, Serbian subcollection of the ELTeC multilingual collection (European Literary Text Collection). After preliminary work on the manual Wikidata population with SrpELTeC novels, the goal was to automate the process of preparing and importing information, so different solutions were analysed and ...Milica Ikonić Nešić, Ranka Stanković, Biljana Rujević. "Serbian ELTeC Sub-Collection in Wikidata" in Infotheca, Faculty of Philology, University of Belgrade (2021). https://doi.org/10.18485/infotheca.2021.21.2.4
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Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4
Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan (2022)In recent years, thermal decomposition studies of transition metal complexes with benzenepolycarboxylate ligands have become an area of a great importance due to the possibility of obtaining useful metal oxides with desirable electrical, magnetic and catalytic properties [1]. As a contrast to conventional methods for the preparation of metal oxides, such as hydrothermal or sol–gel treatment, thermolysis is faster, more efficient ...Lidija Radovanović, Željko Radovanović, Aleksandar Kremenović, Bojana Simović, Milica V. Vasić, Jelena Rogan. "Manganese-pyromellitate complex as a precursor for preparation of spinel Mn3O4 " in XIV Conference of chemists, technologists and environmentalists of Republic of Srpska, Academy of sciences and arts of the Republic of Srpska, Banja Luka, Republic of Srpska, B&H, October 21st-22nd, 2022, University in Banjaluka, Faculty of Technology (2022)
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The number of nonunimodular roots of a reciprocal polynomial
Dragan Stankov (2023)We introduce a sequence Pd of monic reciprocal polynomials with integer coefficients having the central coefficients fixed as well as the peripheral coefficients. We prove that the ratio of the number of nonunimodular roots of Pd to its degree d has a limit L when d tends to infinity. We show that if the coefficients of a polynomial can be arbitrarily large in modulus then L can be arbitrarily close to 0. It seems reasonable to believe that if ...Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomialsDragan Stankov. "The number of nonunimodular roots of a reciprocal polynomial" in Comptes rendus mathematique, Elsevier France Editions Scientifiques et Medicales (2023). https://doi.org/10.5802/crmath.422
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Глаголи у кухињи и за столом
Цветана Крстев, Биљана Лазић (2015)У раду је приказано истраживање лексике на српском језику кулинарског домена које се заснива на коришћењу доменског корпуса, електронских лексичких ресурса, пре свега WordNet-а и морфолошких речника, и локалних граматика. Приказане су доменске специфичности ових ресурса, како се користе, и међусобно употпуњују. Посебно је приказано како се коришћењем доменског корпуса могу екстраховати глаголи специфични за кулинарски домен и описати начини њиховог коришћења. Дат је попис глагола са основним подацима који је добијен применом представљених метода.аутоматска обрада, коначни трансдуктори, електронски речници, семантичке мреже, локалне граматике, кулинарство... пихтије, са бареним кромпиром смрвити смрвљен да бибер смрзнути смрзнут да бораније, сардела, бакалар, вишње снижавати снижавање да масноћа солити сољен, сољење да кикирики, хране спајати спајање, спајати да ванилица, улупаним шлагом, спојити спојити да са динстаним поврћем, са посним мајонезом ...
... млеко за натапање, пишкота, кекса натопити натопљен, натопити да пишкоте, хладним чоколадним млеком, лимуновим соком натрљати натрљати да морском сољу, белим луком, уситњеним рузмарином натрунити натруњен да босиљак, суви босиљак нафиловати нафиловати, нафилован да тесто обавити обавити да танком ...
... динстање да батака, лука, меса добијати добијање да багремовог уља добити добијен да гил, сок од купина додавати додавање да различитим јелима, кухињске соли додати додати да брашна, воде, готовим шампињонима доливати доливање да воде, млека, супе досипати досипање да воде досолити досољавање да хране ...Цветана Крстев, Биљана Лазић. "Глаголи у кухињи и за столом" in Научни састанак слависта у Вукове дане - Српски језик и његови ресурси: теорија, опис и преимене, Вол. 44/3, Београд : Међународни славистички центар (2015)
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Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels
Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković. "Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels" in SPE Journal (2023)
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Pleistocene rhinoceros from Bogovina Cave: the first report of Stephanorhinus hundsheimensis Toula, 1902 (Mammalia, Rhinocerotidae) from Serbia
Finds of Pleistocene rhinoceros are rare in Serbia, and only one species (the woolly rhinoceros Coelodonta antiquitatis Blumenbach, 1799) has been reported so far. The current paper presents the dental material of an extinct so-called Hundsheim rhinoceros, Stephanorhinus hundsheimensis Toula, 1902 from Bogovina Cave (East ern Serbia). Both the morphological and metric characteristics of the teeth are consis tent with the attribution to S. hundsheimensis. Unfortunately, the rhinoceros material originated from an uncertain geological context, so there is no ...... in Serbia, and only one species (the woolly rhinoceros Coelodonta antiquitatis Blumenbach, 1799) has been reported so far. The current paper presents the dental material of an extinct so-called Hundsheim rhinoceros, Stephanorhinus hundsheimensis Toula, 1902 from Bogovina Cave (East- ern Serbia). Both ...
... teeth are consis- tent with the attribution to S. hundsheimensis. Unfortunately, the rhinoceros material originated from an uncertain geological context, so there is no firm basis for dating. However, a potential association with a caballoid horse tooth could hint at an age of 600 ka or less for the assemblage ...
... Mijović, 2004). Only one species, the woolly rhinoceros (Coelodonta antiquitatis Blumenbach, 1799), has been documented in the Pleistocene of Serbia so far (Marković, 1998; Nedeljković, 2006). This paper reports on rhinoceros dental remains originating from Bogovina Cave [Bogovinska pećina], situated ...Predrag Radović, Miloš Radonjić, Emmanuel Billia. "Pleistocene rhinoceros from Bogovina Cave: the first report of Stephanorhinus hundsheimensis Toula, 1902 (Mammalia, Rhinocerotidae) from Serbia" in Palaeontologia Electronica, Coquina Press (2020). https://doi.org/10.26879/985
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Uticaj raspadanja na stabilnost kosina u mekoj stenskoj masi
Anđela Despotov (2024)U radu je opisano ponašanje mekih stenskih masa koje su izložene porecesu raspadanja tokom određenog vremenskog perioda. Meke stenske predstavljaju kritične vrste stenskih masa pošto izazivaju različite probleme tokom izvođenja građevinskih radova. Meke stene mogu biti sedimentne stene, raspadnute metamorfne i magmatske stene. Odlikuju se niskim vrednostima čvrstoće, visokom deformabilnošću, visokom plastičnošću, podložne su dezintegraciji i fizičko-hemijskom raspadanju, odnosno ubrzanom dejstvu površinskog raspadanja usled atmosferskih uticaja.Za klasifikaciju mekih stenskih masa koriste se modifikovane verzije već postojećih klasifikacionih sistema. Jedan ...... izražena temperaturna kolebanja. Usled taloženja soli u pukotinama stena dolazi do kristalizacije minerala i povećanja pritiska odnosno dodatnih napona. Samim tim dolazi do dezintegracije stenske mase, a njen intenzitet zavisi i od tipa stena i od tipa soli. Oblasti u kojima se Javlja označene su visokom ...
... će doći usled temperaturnih promena, vlaženja i sušenja, zamrzavanja i odmrzavanja, pritisaka vode i leda u porama i diskontinuitetima, taloženja soli u pukotinama stena, bubrenja i skupljana materijala zbog apsorpcije vode i rasta korenja biljaka. U slučaju temperaturnih promena postoje dnevne ...
... vode, koja često sadrži rastvorene kiseline u sebi. Kao produkt hidratacije javljaju se minerali glina poput kaolinita, montmorionita i rastvorljive soli (slika 5). Oksidacija je proces kod kojeg je aktivni agens kiseonik iz vazduha, a odnosi se na njegovu reakciju sa elementima metala koji se nalaze ...Anđela Despotov. Uticaj raspadanja na stabilnost kosina u mekoj stenskoj masi, 2024
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Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)
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 ...... did not contain any vitrinite particles, so measurements could not be done. �e results of thermal maturity determination of the Triassic sediments analysed show that they have a mean vit- rinite re�ectance between 0.66% Rr (Župa) and 0.78% Rr (Klobuk), so both re�ectance values support the oil window ...
... did not contain any vitrinite particles, so measurements could not be done. The results of thermal maturity determination of the Triassic sediments analysed show that they have a mean vit- rinite reflectance between 0.66% Rr (Zupa) and 0.78% Rr (Klobuk), so both reflectance values support the oil window ...
... risk in the area, in terms of the petroleum sys- tem, is uncertainty about the existence of e�cient seals. �ere has been no drilling for oil and gas so far, but there is a well-known bitumen seep east of Ljubinje (Mišljen, Fig. 1C – on the le� border) in the Cretaceous limestone. �e Mišljen occurrence ...Nikoleta Aleksić, Aleksandar Kostić, Miloš Radonjić. "Composition of organic matter and thermal maturity of Mesozoic and Cenozoic sedimentary rocks in East Herzegovina (External Dinarides, Bosnia and Herzegovina)" in Annales Societatis Geologorum Poloniae (2021). https://doi.org/10.14241/asgp.2021.16
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Cyanobacterial diversity and toxicity of biocrusts from the Caspian Lowland loess deposits, North Iran
Tamara Dulić, Jussi Meriluoto, Tamara Palanački Malešević, Violeta Gajić, Tamara Važić, Nada Tokodi, Igor Obreht, Bojan Kostić, Petar Kosijer, Farhad Khormali, Zorica Svirčev (2016)Biocrusts and adjacent sediments were collected from the so-called loess plateau of Northern Iran and the loess deposits on the foothills of Alborz Mountains. The mineralogical and granulometric analyses characterized sediments as quartz-rich clayey or sandy silts. Cyanobacterial diversity, colony morphology and grain stabilization were studied by light and scanning electron microscopy, which showed glue-like layers of cyanobacterial EPS and dense networks of filamentous cyanobacteria immobilizing finer and bigger grains, respectively. Amorphous, tuft and globular cyanobacterial colony structures were also detected. 15 cyanobacterial genera were ...Tamara Dulić, Jussi Meriluoto, Tamara Palanački Malešević, Violeta Gajić, Tamara Važić, Nada Tokodi, Igor Obreht, Bojan Kostić, Petar Kosijer, Farhad Khormali, Zorica Svirčev. "Cyanobacterial diversity and toxicity of biocrusts from the Caspian Lowland loess deposits, North Iran" in Quaternary International (2016)
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Status and tendencies under development and application of underground coal gasification-UCG
Podzemna gasifikacija uglja u Svetu poslednjih decenija doživljava znatnu ekspanziju u istraživanju i razvoju zbog uveliko iskorišćenih ležišta uglja i loših ekoloških efekata (pri sagorevanju u TE) na životnu okolinu. Srbija ima znatne rezerve uglja, a kada bi se za PGU koristile samo vanbilansne rezerve i otkopni ostaci bilansnih, jasno je kakvi bi bili ekonomski (a i energetski i ekološki) efekti. U radu su sagledane aktivnosti u Svetu na tom planu, pa smatramo da ima smisla i potrebe za primenu ove ...David Petrović, Lazar Kričak, Stefan Milanović, Jovan Marković, Nikola Simić. "Status and tendencies under development and application of underground coal gasification-UCG" in International Conference “Energy and Ecology Industry EEI2018”, Beograd : Akademija inženjerskih nauka Srbije (AINS) (2018)
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Annotation of the Serbian ELTeC Collection
Ovaj rad predstavlja takozvano izdanje nivoa 2 kolekcije tekstova SrpELTeC razvijene u okviru aktivnosti Radne grupe 2 – Metode i alati COST akcije CA 16204 (Distant Reading for European Literary History) i njene specifikacije šeme. Izdanje nivoa 2 je nastavak izdanja nivoa 1, koje se koristi kao ulaz za morfosintaksičke i NER anotacije romana. Srpska obrada nivoa-2 je navedena kroz potrebne korake, uključujući metode i alate koji se koriste u tom procesu. Neki statistički podaci iz srpske kolekcije nivoa ...udaljeno čitanje, literarni korpus, tagiranje, prepoznavanje imenovanih entiteta, lematizacija, ELTeCRanka Stanković, Cvetana Krstev, Branislava Šandrih Todorović, Mihailo Škorić. "Annotation of the Serbian ELTeC Collection" in Infotheca, Faculty of Philology, University of Belgrade (2021). https://doi.org/10.18485/infotheca.2021.21.2.3