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Упит dcterms_subject_txt:secondary compression index

257 items

  • Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia

    Nikola Burazer, Aleksandra Šajnović, Nebojša Vasić, Milica Kašanin-Grubin, Dragana Životić, João Graciano Mendonça Filho, Predrag Vulić, Branimir Jovančićević (2020)
    Stratigraphy,Economic Geology,Geology,Geophysics,Oceanography

  • Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)

    Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)
    Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...
    Sphene, Phase transition, Raman spectroscopy, X-ray diffraction, SEM, IR

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... cylinder, resulting in an increase in pressure within the pump. The reverse flow and pressure increase force the standing valve to close, and the compression cycle continues until the pressure within the cylinder exceeds the pressure above the traveling valve. At this point, the traveling valve opens ...
    ... · ~ || - SUCKER ROD : | || |E | - - TUBING TRAVELING UNIT TRAVELING UNIT 'STANDING UNIT 'STANDING UNIT Figure 2.1. Intake Cycle, Compression, and Discharge Cycle [6] 3 SUBSURFACE EQUIPMENT The main components of subsurface equipment for deep-well pumping are: • Sucker Rod Pump ...
    ... 6466 percent Intake Pressure | 60 || MidPoint Perforation Depth | 754 UitETlidancy 0·5\_ 76503 _ |percent Calculate Iritake Pressure Economic Index (ET) 0.071985 44 PODLOADPLOT = -E ___> : !%_ =O === == TOROUE FLOT Eš [3 ; O - OG - OOOR O O N i —= 'Puro VWody Pkt PUMPVELOCITYPLOT ...

  • The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments

    Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević (2013)
    The objective of the study was to determine the origin and type of organic matter (OM) of the Tisza recent sediments along the distance of 153 km through the territory of Serbia. For this purpose group organic-geochemical parameters and biomarker compositions were used. All samples contain approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, n-alkane patterns ...
    sediments, Tisza River, organic matter, biomarkers, oil pollutants
    ... parameters calculated from distributions and abundances of tricyclic and pentacyclic terpanes; OI – oleanane index = oleanane×100/(oleanane+C3017α(H)21β(H)- -hopane); GI – gammacerane index = gammacerane×100/(gammacerane+C3017α(H)21β(H)- -hopane) Sample OI GI C26 tricyclic terpane / C25 tricyclic ...
    ... petroleum origin. This primarily refers to n-alkanes. In crude oils, n-alkanes have uniform distribution of odd and even homologues (the Carbon Preference Index, CPI, is about 1), usually in the range of C10–C35. An n-alkane distribution with a strong predominance of lower homologues C12–C22 indicates algal ...
    ... 1.32 6.66 0.89 0.96 0.89 M4 C16–C35 C27; C29 4.68 1.13 5.28 0.54 0.65 0.50 M5 C16–C35 C27; C29 4.39 1.23 5.38 0.82 0.93 0.77 aCarbon Preference Index (CPI) determined for the full distribution of n-alkanes C16–C35 (mass chromatogram m/z 71), CPI (C16–C35) = 1/2 [Σodd(n-C17–n-C35) / Σeven(n-C16–n-C34) ...

  • Models of Determining the Parameters of Rock Mass Oscillation Equation with Experimental and Mass Blastings

    Suzana Lutovac, Branko Gluščević, Rade Tokalić, Jelena Majstorović, Čedomir Beljić (2018)
    ... assess the degree of connection between v and R, we have used the curved line dependency index ρ [14,15]. The evaluation of the relationship degree of two variables [7] to values of the curved line dependency index ρ is given in the following survey: 0.0 < ρ < 0.2—none or highly poor correlation, 0.2 ...
    ... on the data in Table 3, a statistical analysis was carried out and the following values were obtained: • for model 1: The curved line dependency index ρ1 between the reduced distance R and rock mass oscillation velocity v is: ρ1 = 0.9730 (there is a strong correlation between R and v, given in the ...
    ... on the data in Table 3, a statistical analysis was carried were obtained: e for model 1: out and the following values The curved line dependency index p; between the reduced distance R and rock mass oscillation velocity v is: 01 = 0.9730 (there is a strong correlation between R and v, given in the ...

  • Development of an integrated model for open-pit-mine discontinuous haulage system optimization

    Miodrag Čelebić, Dragoljub Bajić, Sanja Bajić, Mirjana Banković, Duško Torbica, Aleksej Milošević , Dejan Stevanović (2024)
    equipment selection, mine mechanization, expert judgment, linguistic variables, MCDM, FAHP

  • Building Terminological Resources in an e-Learning Environment

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... Weak semantic description Thesaurus A taxonomy expanded to include additional semantic relationships Index a list of terms specific to a certain field Glossary an index containing definitions of terms Taxonomy A hierarchical organization of terms RudOnto Figure 1: Semantic ...
    ... 1. We will give a brief outline of these forms, but it should be stressed that the boundaries between them are not always easily determined. Index is the simplest form, basically just a list of terms, usually arranged in alphabetical order. Glossaries, which are on the next level of the spectrum ...

  • Numerical Models of Debris Flows with Entrainment Analysis-Case Studies from the Republic of Serbia

    Jelka Krušić , Biljana Abolmasov, Miloš Marjanović (2021)
    The results of material entrainment analysis in RAMMS debris flow software, as well as numerical models of final flow heights for two case studies from the Republic of Serbia are presented. Both of debris flow cases started with initial sliding of huge volume block, prolonging to behave as flowing process. Results of the analysis showed that entrainment material affects final results of transportation model, runout distance, deposition area and volume of debris flow. In both cases entrainment volume is very ...
    tecišta, zadržavanje nanosa, RAMMS, validacija

  • Some models for determination of parameters of the soil oscillation law during blasting operations

    Suzana Lutovac, Dragan Medenica, Branko Gluščević, Rade Tokalić, Čedomir Beljić (2018)
    ... assess the degree of connection between v and R, we have used the curved line dependency index ρ [9]. The evaluation of the relationship degree of two variables [5] to values of the curved line dependency index ρ is given in the following survey: ‚ 0.0 < ρ < 0.2—none or highly poor correlation; ‚ 0 ...
    ... on the data in Table 2, a statistical analysis was carried out and the following values were obtained: ‚ For model 1: The curved line dependency index ρ1 between the reduced distance R and soil oscillation velocity v is: ρ1 = 0.9880 (there is a strong correlation between R and v, given in Equation ...
    ... Based on the data in Table 5, a statistical analysis was carried out and the following values were obtained: ‚ For model 1 The curved line dependency index ρ1 between the reduced distance R and soil oscillation velocity v is: ρ1 = 0.9843 (there is a strong correlation between R an v, given in Equation ...

  • Analysis of a simplified model for determining rock mass oscillation velocity at the Kovilovača open pit

    Suzana Lutovac, Miloš Gligorić, Jelena Majstorović, Luka Crnogorac (2023)
    ... K for models 1 — 5. Besides, in order to evaluate the degree of connection between the reduced distances R and oscillation velocities V we used index of the curved dependency o [7]. In order to make sure that the conclusions we reach based on the sample concerning the characteristics of the basic ...
    ... ) | ) | — Based on data from table 4, a statistical analysis has been done and following values have been obtained. The curved line dependency index QO between the reduced distance R and rock mass oscillation velocity Y : 202 • muodell: ,= 0.9843 for total of 12 data (there is a strong correlation ...

  • Hydrogeochemical distribution of Ca and Mg in groundwater in Serbia

    Petar Papić, Jovana Milosavljević, Marina Ćuk, Rastko Petrović (2014)

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods

  • Развој геолошког терминолошког речника ГеолИССТерм

    Ranka Stanković, Branislav Trivić, Olivera Kitanović, Branislav Blagojević, Velizar Nikolić (2011)
    ... Debo- rah l. mcguinness (2003). The starting point in the lower left corner is an index, as the simplest list of terms (usually arranged in the alphabeti- cal order), followed by a glossary, which, like an index contains definitions of terms. Glossaries are lists of terms with definitions that ...
    ... Weak semantic description Thesaurus A taxonomy expanded to include additional semantic relationships Index a list of terms specific to a certain field Glossary an index containing definitions of terms Taxonomy A hierarchical organization of terms GeolISSTerm Figure 1. Semantic ...

  • GIS Application Improvement with Multilingual Lexical and Terminological Resources

    Ranka Stanković, Ivan Obradović, Olivera Kitanović (2010)
    ... conceived within the Balkanet project (Tufiş, 2004), presently encompasses about 14,800 synsets. Synsets in SWN are connected via the Interlingual index (ILI) (Vossen, 1998) with synsets lexicalizing same (or similar) concepts in English within the Princeton wordnet, which is publicly available. ...
    ... m. The multilingual character of GeolISSTerm and the fact that the concepts of Serbian and English wordnets are related by the Inter-Lingual-Index provide for the sharing of GeolISS with the international GIS community. This feature will be further enhanced by upgrading GeolISS on the basis ...

  • Resource-based WordNet Augmentation and Enrichment

    Ranka Stanković, Miljana Mladenović, Ivan Obradović, Marko Vitas, Cvetana Krstev (2018)
    In this paper we present an approach to support production of synsets for SerbianWordNet(SerWN)byadjustingPrincetonWordNet(PWN)synsetsusing several bilingual English-Serbian resources. PWN synset definitions were automatically translated and post-edited, if needed, while candidate literals for Serbian synsets were obtained automatically from a list of translational equivalents compiled form bilingual resources. Preliminary results obtained from a setof1248selectedPWNsynsetsshowthattheproducedSerbiansynsetscontain 4024 literals, out of which 2278 were offered by the system we present in this paper, whereas experts added the remaining 1746. Approximately one half of ...
    WordNet, bilingual resources, term alignment, parallel lists
    ... 2004) for a cluster of languages from the Balkans. The EuroWordnet and BalkaNet projects extended the PWN approach by introducing an Inter- Lingual Index (ILI), used to align synsets in different languages within each cluster on basis of PWN structure. In BWN, the structure of PWN was extended to accommodate ...
    ... and 121 synsets with more than five literals. The majority of SerWN synsets are aligned with corresponding PWN 3.0 synsets via the Interlingual Index, with the exception of a little over 1,000 Serbian specific synsets that do not exist in PWN. In our research we used 20,221 aligned synsets (from ...
    ... appropriate. Figure 2 presents an example of the document generated to support experts in their adjustment task. Column ID contains the interlingual index, used to bind definition and literals of a specific synset. Column domain shows the synset domain from PWN and is used to check whether the synset ...

  • Machine learning based landslide assessment of the Belgrade metropolitan area: Pixel resolution effects and a cross-scaling concept

    Uroš Đurić, Miloš Marjanović, Zoran Radić, Biljana Abolmasov (2019)
    Improvements of Machine Learning-based landslide prediction models can be made by optimizing scale, customizing training samples to provide sets with the best examples, feature selection, etc. Herein, a novel approach, named Cross-Scaling, is proposed that includes the mixing of training and testing set resolutions. Hypothetically, training on a coarser resolution dataset and testing the model on a finer resolution should help the algorithm to better generalize ambiguous examples of landslide classes and yield fewer over/underestimations in the model. This ...
    klizišta, podložnost, mašinsko učenje

  • 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
    ... controversial topic in land- slide assessment (BARREDO et al., 2000; ARDIZZONE et al., 2002; ERCANOGLU et al., 2008). It is based on the use of an index or parameter maps (SOETERS & VAN WESTEN, 1996), and it is accepted as being applicable only for the preliminary levels of research (GÜNTHER et al ...
    ... lithology, engineering-geo- logical characteristics of the rock masses, DEM derivatives, slope aspect, elevation, normalized difference vegetation index (NDVI) , and land use, landform classification, rainfall, runoff curve num- ber (CN), seismic influence, distance from structural elements (such as ...
    ... CONSTANTIN, M., BEDNARIK, M., JURCHESCU, M.C. & VLAICU, M. (2011): Landslide susceptibility assessment using the bivariate statistical analysis and the index of entropy in the Sibiciu Basin (Romania).– Environmental Earth Sciences, 63/2, 397–406. doi: 10.1007/s12665-010-0724-y COROMINAS, J., VAN WESTEN ...

  • Multi-Criteria Approach for Selecting Optimal Dozer Type in Open-Cast Coal Mining

    Ivan Janković, Stevan Đenadić , Dragan Ignjatović , Predrag Jovančić , Tomislav Šubaranović, Ivica Ristović (2019)
    Analitički hijererhijski proces (AHP), dozeri, eksploatacija uglja, površinski kopovi
    ... defined using the following equation: CR = CI RI (5) where RI is the Random Consistency Index (Table 3) which depends on the number of analysed objects n. Table 3. The values of the Random Consistency Index (RI) (Saaty, 1991). n 1 2 3 4 5 6 7 8 9 10 RI 0.00 0.00 0.52 0.89 1.11 1.25 1.35 1.40 1.45 ...
    ... the AHP method is checking for mistakes [24], that is, checking of the consistency of the decision-maker. The mathematical check of the Consistency Index (CI) is done using Equation (3). CI = (λmax − n) (n − 1) (3) where λmax represents the maximum value of the calculated matrix and is defined using ...
    ... the AHP method is checking for mistakes [24], that is, checking of the consistency of the decision-maker. The mathematical check of the Consistency Index (CI) is done using Equation (3). max(λ n)CI= (n 1) − − (3) where λmax represents the maximum value of the calculated matrix and is defined using ...

  • 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

  • Sitni, ali bitni: uloga sitnih sisara, herpetofaune i mekušaca u rekonstrukciji pleistocenskih paleosredina

    Katarina Bogićević, Draženko Nenadić, Dragana Đurić, Mihajlo Jovanović, Aleksandra Savković (2023)
    Fosilni ostaci životinja i biljaka imaju važnu ulogu u rekonstrukciji pleistocenskih paleosredina. U ovom radu opisan je značaj tri grupe životinja: sitnih sisara, herpetofaune I mekušaca. Mada je za rekonstrukciju važan sastav čitave asocijacije, nalasci pojedinih vrsta mogu biti dovoljno indikativni da otkriju tip staništa ili klimatske uslove. Posebnu teškoću pri rekonstrukciji paleosredina u Srbiji predstavlja činjenica da klimatske promene na Balkanskom poluostrvu nisu bile tako oštre kao u srednjoj i zapadnoj Evropi, pa ne postoji drastična razlika u ...
    ... most often lives today, and then the percentage representation of each group in the entire fauna is calculated. One of the variants is the TH- index method, where the affinity for 9 habitat types is determined for each species. Another common method for habitat type reconstruction is the creation ...
    ... herpetofauna, play a significant role in the reconstruction of palaecoenvironments, especially palaeoclimatic conditions. Characteristic species or index-fossils can provide valuable information about the climatic characteristics of an area, since certain species are specially adapted to cold or warm ...