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Упит dcterms_subject_txt:Rastvorne soli

521 items

  • A necessary and sufficient condition for an algebraic integer to be a Salem number

    Dragan Stankov (2019)
    We present a necessary and sufficient condition for a root greater than unity of a monic reciprocal polynomial of an even degree at least four, with integer coefficients, to be a Salem number. This condition requires that the minimal polynomial of some power of the algebraic integer has a linear coefficient that is relatively large. We also determine the probability that an arbitrary power of a Salem number, of certain small degrees, satisfies this condition.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials

  • 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 ...
    ... f ro m w w w .w o rl d sc ie n ti fi c. co m b y U N IV E R S IT Y O F A L B E R T A o n 0 4 /2 6 /1 5 . F o r p er so n al u se o n ly . 362 N. Lilić, I. Obradović & R. Stanković Implementation and maintenance System monitoringDesign Evaluation and m ...
    ... f ro m w w w .w o rl d sc ie n ti fi c. co m b y U N IV E R S IT Y O F A L B E R T A o n 0 4 /2 6 /1 5 . F o r p er so n al u se o n ly . A Knowledge-Based Approach to Mine Ventilation Planning 363 introduction of a knowledge base, thus upgrading existing ma ...
    ... f ro m w w w .w o rl d sc ie n ti fi c. co m b y U N IV E R S IT Y O F A L B E R T A o n 0 4 /2 6 /1 5 . F o r p er so n al u se o n ly . 364 N. Lilić, I. Obradović & R. Stanković CF D INV E NT S Data acquisition Design Im ple m e n t at io n an d m ain ...

  • On the distribution modulo 1 of the sum of powers of a Salem number

    Dragan Stankov (2016)
    It is well known that the sequence of powers of a Salem number θ, modulo 1, is dense in the unit interval, but is not uniformly distributed. Generalizing a result of Dupain, we determine, explicitly, the repartition function of the sequence , where P is a polynomial with integer coefficients and θ is quartic. Also, we consider some examples to illustrate the method of determination.
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials

  • Стање квалитета амбијенталног ваздуха на подручју града Београда

    Марко Колачарић (2024)
    У овом раду анализирано је стање квалитета амбијенталног ваздуха на територији града Београда. Анализа се заснива на праћењу података о загађујућим материјама прикупљеним у 2022. години са шест мерних места на територији града. Загађивачи који су обухваћени овом радом су сумпор-диоксид (SO2), азот-диоксид (NO2), честични загађивачи (PM2.5 и PM10), тропосферски озон (О3) и угљен-моноксид (СО). На основу добијених резултата предложене су мере за побољшање тренутног система. Констатовано је прекорачење законских граница на свим мерним местима, за једну или више ...
    мониторинг, анализа, загађивачи, квалитет ваздуха, Београд
    ... 659478 KoopnuMHaTe 20.459113 20.400152 20.450184 20.475288 20.521715 20.204496 Haaopcka 103m 74m 83m 141m 240m 76m BMCMHa SO-», NO», SO-», NO», SO-», NO», SO-», NO», SO-», NO», Tlapaverpun Ox, CO, Ox, CO, CO,PMos, | Oj PMas, Os, CO, SF?|Č1 NOŠ'I\ŽO' PMzs, PMa | PMzs, PMio PMno PMuo PMzs, PMuo ...
    ... yKyC. TOKCHUHOCT My Ce nmojauaBa y yCJIOBHMa HoBehaHec BJIJ)KHOCTH 3OOr CrBapaMba CyMIHIOpHC KHCCJIHHC. IIpog3BonjH oKkcHjarmje SO> y Ba3JlyXy TOKCHuHHJH Cy OJI cCaMoOr SO». OBe peaktije y arMoc(bepu, yOp3aBajy rpacyTHa BojteHa mapa H uBpcTe uecTumee [1]. CnBa (QpocHiiHa ropHBa cajlpx;ke CyMIIOp ...
    ... CyMrnop-okcuHii (SO->) I paHiuHe BpeJIHOCTH CpejiPbe KOHIIeHTPparnuje 3a rIepHoji ycpejibaBahba oJ lu H 24u cy 350 ug/m? a 125 Hg/m?, OK Cy JO3BOJBeHH Opoj HpeKopauekba y KaJIeHJIApCKOJ TOJMHH 3a HcTc HepHojie ycpenpaBaMma 24x oHocHo 3x. Ha ocHoBy pe3ymrara MepeMba KoHneHrTpanuja SO> koju cy npHKa3aHu ...

  • Fizičko-hemijsko raspadanje krečnjaka ugrađenih u objekte Beogradske tvrđave i mogućnost konsolidacije

    Maja Z. Franković (2022)
    Beogradska tvrđava, spomenik kulture od izuzetnog značaja za Republiku Srbiju, izgrađena je od krečnjaka badenske starosti. Njihova litološka heterogenost, u sadejstvu sa uticajima okruženja, rezultira visokim intenzitetima raspadanja. Korelacijom intrinzičnih sa ekstrinzičnim faktorima, definisani su fizičko-hemijski procesi raspadanja ugrađenih mikrofacija krečnjaka. Aplikacijom neorganskih konsolidanata na karbonatnoj bazi (nano-kreča i Ca-acetoacetata) i alkoksisilana, te korelacijom fizičko-mehaničkih svojstava pre i nakon tretmana, ispitana je efektivnost u pogledu zaustavljanja dekohezije krečnjaka. Određivanjem petroloških, tehničkih svojstava i mapiranjem formi raspadanja Mračne kapije kao ...
    krečnjaci, forme i intenziteti degradacije, fizičko-hemijsko raspadanje, konsolidacija, nano-kreč, Ca-acetoacetat, alkoksisilani, Mračna kapija

  • Wells calculation for the protection of opencast mine Radljevo North from groundwater

    Dušan Polomčić, Vladimir Petković, Miloš Jeremić (2018)
    Za projektovanje kvalitetnog sistema zaštite jednog površinskog kopa od podzemnih voda bitno je da ulazni podaci budu verodostojni, kako bi se na osnovu njih izvršili potrebni proračuni objekata odvodnjavanja podzemnih voda. Proračunima za površinski kop Radljevo Sever je omogućeno da se dobije potreban broj bunara kako bi oni pravilno funkcionisali i obezbedili potrebno obaranje podzenih voda.
    Radljevo, ugalj, odvodnjavanje, bunari

  • Optimization and Analysis of Drilling and Blasting Parameters Using O-Pitblast Software

    Stefan Milanović, Nikola Simić, Lazar Kričak, Milanka Negovanović, Nikola Đokić (2024)
    The development of modern technologies has enabled the application of specialized softwares in the field of mining through various segments and processes, including in works related to drilling and blasting. The application of specialized software for drilling and blasting with the use of modern technologies such as photogrammetry enabled more accurate data from the field for later processing. By processing data and creating a 3D model of the terrain for drilling and blasting works, it can obtain precise data, ...
    optimizacija, 3D model, bušenje, miniranje, O-Pitblast, softver

  • The Importance of Geotechnical Investigations for the Construction of Transfer Station „Prelići“ on Landfill in Cacak – Serbia

    Dragoslav Rakić, Irena Basarić, Jovana Janković, Tina Đurić (2019)
    For the purpose of the facilities construction within the transfer station „Prelici“ in Cacak, specific geotechnical investigations were carried out based on which the technological project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the terrain, it was proposed to move the planned facilities which led to the ...
    landfill, geotechnical investigations, transfer station
    ... project with the facilities schedule was developed. Significant deviations in relation to the presented results were determined during earthworks, so the additional geotechnical investigation works were carried out. Since the new investigation works have determined a different cross section of the ...
    ... which in most cases do not meet even minimal protection measures, and therefore, most of them represent dumps. They are usually already filled, so they must be closed and repaired or recultivated as soon as possible (Rakic, Coric, Basaric & Jankovic, 2017). For these reasons, ecological standards ...
    ... landfills, • the lack of adequate municipal infrastructure (roads, water supply, sewerage, electrical installations) at locations outside urban areas, so the costs of preparing the terrain often exceed the costs of establishing a recycling yard, i.e. transfer station, • increasing investment and e ...

  • Estimating hydraulic parameters for the complex hydrodynamic models

    Dušan Polomčić, Dragoljub Bajić, Jelena Ratković, Bojan Hajdin (2018)
    Hydrodynamic models have usually been calibrated manually, by trial-and-error, with different values of hydraulic parameters and hydraulic characteristics of boundary conditions. This method of calibration and estimation of hydraulic parameters requires an extensive knowledge and experience of experts, but whether the resulting solution includes an optimal set of parameters still remains an open question. An optimization method founded upon the Gauss-Marquardt-Levenberg algorithm, along with PEST software based on that algorithm, introduces automation of model calibration with regularization, which substantially ...
    kalibracija, optimizacija, PEST, koeficijent filtracije

  • 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
    ... during preprocessing step) is replaced with < character, so that the emoticon <3 cound be found in the text. Entity reference 039 is replaced with ’ charac- ter, so that emoticons such as :’( could be found. String :- is replaced with character : , so that both characters with and without nose such as :-D ...
    ... completed, and he can move onto the next step. 3.3 Assigning values to segments of text In the experiment segment of text or a sentence is equated with a sole message sent from one user to another. The basic idea is that the values of determiners found in the message reflect the value of the message, and the ...
    ... classify moods of Twitter posts as either positive or negative (Go and Bhayani, 2009). The goal was to create a system for the classification of posts, so that consumers can explore the attitude of previous customers before buying a product. Several different algorithms for machine learning 68 Infotheca ...

  • Infotheca (Q25460443) in Wikidata

    Ranka Stanković, Lazar Davidović (2021)
    Vikipodaci su baza znanja Zadužbine Vikimedija koja predstavlja zajednički izvor različitih vrsta podataka koje koriste ne samo drugi Vikipedijini projekti, već sve više i brojne aplikacije semantičkog veba. U ovom radu ćemo prezentovati primer integracije Vikipodataka sa digitalnim bibliotekama i eksternim sistemima, kao i mogućnost ubrzanja pripreme i unosa podataka na primeru radova iz časopisa za digitalnu humanistiku Infoteka.
    semantički veb,otvoreni povezani podaci, vikpodaci,Infoteka, metapodaci časopisa
    ... abridged notation doing away with the repetition of the subject, so that the punctuation mark “.” indicates that the predicate that follows refers to the same subject. Similarly, the items in Wikidata represent relations as triples, so that the relation Tesla-way of life-vegetarianism is encoded as Q9036 ...
    ... parenthesis. An item is, thus, linked to a unique identifier (QID), the identifier is, in turn, linked to the item’s corresponding title and description, so as to remove any ambiguity. An identifier of a data item (QID) can, in addition to being linked to a title and a description, have a number of aliases ...
    ... was to speed up the entry of data about the results of the research in the domain of digital humanities in Serbia, as well as about old Serbian novels, so as to increase the visibility of both the Serbian language, our cultural heritage and the results of the research in Serbia and certainly pave the way ...

  • Modeliranje disperzije dimnih gasova iz termoelektrane ,, Nikola Tesla”

    Milica Kostić (2024)
    Termoelektrane na ugalj, iako značajan izvor električne energije, predstavljaju veliki izazov zbog zagađenja koje uzrokuju. Glavni uzrok zagađenja je neumerena ljudska potreba za energijom i resursima, što dovodi do emisije različitih zagađivača u atmosferu, uključujući okside ugljenika, sumpora, azota, kao i lebdeće čestice i toksine. Ove emisije imaju negativan uticaj na kvalitet vazduha, zdravlje ljudi i životnu sredinu. Procena uticaja termoelektrana na ugalj na životnu sredinu je zakonska obaveza i ključna za smanjenje tih negativnih efekata. Ovaj dokument analizira potencijalne ...
    zaštita životne sredine, termolektrana ,,Nikola Tesla A”, modeliranje, zagađenje vazduha
    ... ugljenmonoksid (CO) koji nastaje nepotpunim sagorevanjem ugljenika (C); sumpornog dioksida (SO-) koji nastaje sagorevanjem sumpora; sumpornog trioksida (SO;) koji nastaje oksidacijom sumpornog dioksida (SO»); azota (N) iz goriva ı vazduha koji se dovodi u ložište (azot ne učestvuje u procesu s ...
    ... već su prisutni i u gradovima zemalja u razvoju. Među najznačajnijim zagađivačima vazduha su SO», NO», Ukupne suspendovane čestice (7SP- Tofal Suspended Particulates) ı Ox. Povišene koncentracije SO- često se beleže u zemljama u razvoju, dok je NO» globalni problem zbog upotrebe fosilnih goriva ...
    ... kvaliteta vazduha (SI. gl. RS br. 63/13), možemo konstatovati da se pri modeliranju disperzije SO:> bez odsumporavanja dimnih gasova prekoračujegranične, a dok ako bih se koristilo odsumporavanjem dimnih gasova za SO-», granična vrednost, granica tolerancije i tolerantna vrednost nisu prekoračene. Modeliranjem ...

  • Geotechnical effects of municipal solid waste destruction with different compaction methods

    Jovana M Janković Pantić, Dragoslav R Rakić, Irena G Basarić Ikodinović, Tina D Đurić, Gordana Hadži-Niković (2022)
    Disposal of waste in municipal solid waste landfills is the only way of waste disposal in Serbia, with daily compaction and covering with soil material. Due to less space for the construction of new landfills, it is necessary to use their maximum capacity. Well-compacted municipal solid waste takes up less volume and enables safer storage, so it is useful to previously determine the compaction parameters in the laboratory: maximum dry unit weight (γdmax) and optimal water content (wopt). In ...
    komunalni otpad, zbijanje, Proktorov opit, malj sa šiljcima

  • Hydrochemical features and their controlling factors in the Kucaj-Beljanica Massif, Serbia

    Fen Huang, Ljiljana Vasic, Xia Wu, Jianhua Cao, Saša Milanovic (2019)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Стање квалитета амбијенталног ваздуха на подручју града Панчева

    Александар Маринковић (2024)
    Квалитет ваздуха је кључни фактор за здравље људи и очување животне средине. У овом завршном раду анализирано је стање амбијенталног ваздуха на територији града Панчева како би се сагледали извори загађења, ПЛН мониторинга и изазови у погледу квалитета ваздуха са којима се суочавају сви становници. Кроз примену савремених метода праћења, идентификовани су главни извори загађења и анализирана је дистрибуција загађујућих материја у урбаном окружењу.Праћењем концентрације загађивача као што су честице PM10, PM2.5, сумпор-диоксид (SO2), азот-диоксид (NO2) и други, ...
    мониторинг, загађивачи, здравље, Панчево, квалитет ваздуха
    ... 3arabyjyha Marepuja Mecra (MM) 1. |Ilapa/{ymaga (a),(Mc) SO», BTX, NO:, NO, NOx Ox, CoO 2. BarporacHu IOM (a),(Mc) SO:», BT, NO:, NO, NOx, NHs, H-2S, TNMHC, PMno, PM 5, PMuo 3. | BojnopBmma (a),(Mc) SO», BTX, TRS, PMio 4. Crapuepo (a),(Mc) SO:, BTX, NO:, NO, NOx, Ox, CO, NHxa, PMio 5. HapoynHa ...
    ... epnux cranuma (MC) u 3aralyyjyha Marepuja MepHux Mecra (MM) 1. Ilapa /[ymara SO»>, BeH3eH, ToyeH, KcMJeH, NO)p, NO, NOx, Osx, CO 2. BarporacHH OM SO:>, BT, NO»>, NO, NOx, NHx, H»S, PMno, PM:5, PMuio 3. Bojnonana SO, BeHnegH, TonyegH, KcHeg, PMio 4. CrapueBo BTX, NOx, NHa, PMnio, PM».5 7.5 ...
    ... of Llapa Meceun fiyuiaHa ~ Cauka 8.4.1 Makcuanna 24-uacoena koHyenmpauuja SO> s3a 2023. zo0uny MakcwWMa;nHa 1-uacoBHa KOHueHTpau/ja SO, 3a 2023. ro/lMHYy 600 500 400 300 200 Ko Hu eH Tp au ju jj a SO , 100 o|||Il||.|·_I|||||I|||| o o _čoe M Average of BojnoBMua & „S _ ...

  • Testing the energy value of different types of coal by the method of active thermography

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Predrag Jovančić, Dragutin Jovković (2020)
    In this paper, coal thermograms are presented and analyzed in order to determine their energy value. Two types of coal of different categories, brown and lignite, were selected for active thermographic imaging. The tested coal samples were processed before measurement so that they are similar in dimensions and have two plane-parallel smooth surfaces. The test samples were "primarily" heated under the same conditions and the process of their cooling was monitored by a thermal camera. "Then" they were cooled ...
    Infrared imaging, nondestructive testing, active thermography, coal.

  • Development and Application of Methodology for Quantification of Overbreaks in Hard Rock Tunnel Construction

    Zoran Berisavljević, Dragoljub Bajić, Vojkan Jovičić (2023)
    A methodology for determining overbreaks in hard rock tunnel construction using the drill-and-blast technique is presented in this paper. The methodology was developed for and applied to crystalline medium- to thick-bedded limestone, but it can be used in any jointed hard rock mass. Overbreaks are inevitable in hard rock tunnelling in a low-confinement environment (shallow tunnels up to several hundred meters deep) as a result of wedge failures along unfavourably oriented discontinuities caused by blasting. It is widely accepted ...
    hard rock, drill-and-blast, geological overbreak, technological overbreak, stability criterion, discontinuity orientation, tunnel construction

  • Hydrochemical changes and groundwater grouping data by multivariate statistical methods within one karst system: recharge–discharge zone (Eastern Serbia case study)

    Ljiljana Vasić, Dragana Živojinović, Vladana Rajaković-Ognjanović (2020)
    Geochemistry and Petrology

  • Nonequilibrium athermal random-field Ising model on hexagonal lattices

    Svetislav Mijatović, Dragutin Jovković, Đorđe Spasojević (2021)
    Изингов модел, хексагонална решетка

  • The Reciprocal Algebraic Integers Having Small House

    Dragan Stankov (2021)
    Algebraic integer, the house of algebraic integer, maximal modulus, reciprocal polynomial, primitive polynomial, Schinzel-Zassenhaus conjecture, Mahler measure, method of least squares, cyclotomic polynomials