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Упит dcterms_subject_txt:flow regime

124 items

  • 2D Numerical Simulation of Intraoceanic Subduction during the Upper Jurassic Closure of the Vardar Tethys

    Nikola Stanković, Vesna Cvetkov, Vladica Cvetković (2020)
    ... follow a three-phase evolution of velocity boundary conditions consisting of two convergent phases separated bya single divergent phase where spreading regime is dominant. Effect of duration and magnitude ofthe second phase on model evolution is also explored. Our so far obtained simulations were able to ...

  • Uticaj klimatskih promena na vodne resurse: primer sliv reke Mlave

    Vesna Ristić Vakanjac, Saša Milanović, Ljiljana Vasić, Boris Vakanjac, Saša Bakrač, Radoje Banković, Veljko Marinović (2023)
    Na teritoriji Jugositočne Evrope, pa samim tim i u delu gde živimo (Republika Srbija i Republika Bosna i Hercegovina) za očekivati je da dođe do značajnijeg porasta temperature vazduha u značajnijoj meri, što će imati značajnijeg uticaja na padavine, njihovu unutargodišnju raspodelu, kao i pojavu sve više prisutnih ekstremnih vrednosti (izuzetno sušnih i kišnih godina). Sve ovo će uticati i na sam režim površinskih i podzemnih voda, resursa bez kojih život na ovoj planeti ne bi ni postojao. Da ...

  • Influence of DEM resolution on numerical modelling of debris flows in RAMMS - Selanac case study

    Jelka Krušić, Biljana Abolmasov, Mileva Samardžić Petrović (2019)
    Debris flows induced by intensive rainfall represent very hazardous phenomena in many parts of the World. Methods for prediction of runout distance of flow like mass movements are different and depending on the input data, rheology, and available or appropriate numerical solution. However, sometimes it is not easy to obtain pre event and post event high-resolution data in the rural or mountainous area. Thus, the topology of terrain is the most important input parameter for the every real case ...
    tecišta, modeliranje, RAMMS, DEM
    ... tested in RAMMS:DEBRIS FLOW® with different resolution of input data on the Selanac debris flow in Western Serbia. Keywords debris flow, modelling, RAMMS, DEM Introduction Debris flows are one of the most dangerous and unpredictable landslide types. In modelling of flow type landslides, there ...
    ... the flow material can be defined for the resistance of the solid phase (the term containing / which extensively controls deceleration behaviour of a more slowly moving flow. The resistance of the viscous or turbulent fluid phase (the term including / prevails for a more quickly moving flow (Bartelt ...
    ... finally precision of initial parameters and deposition zones. The Selanac debris flow was triggered after extreme precipitation of about 230 mm over a period of 72 h in May 2014.The Selanac is a complex debris flow, with large depth in source zone (30m), and length of about 1.5km. First results ...

  • Nonequilibrium athermal random-field Ising model on hexagonal lattices

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

  • Effects of external noise on threshold-induced correlations in ferromagnetic systems

    Dragutin Jovković, Sanja Janićević, Svetislav Mijatović, Lasse Laurson, Đorđe Spasojević (2021)
    Изингов модел, праг детекције, екстерни шум

  • A hydrogeological model of the open-cast mine Tamnava - West Field (Kolubara Coal Basin, Serbia)

    Jelena Ratković, Dušan Polomčić, Dragoljub Bajić, Bojan Hajdin (2016)
    ... complexity of the conditions, and includes modeling of the (Polomčić, 2002): - flow field (aquifer geometry), - filtration characteristics of the porous medium and hydrodynamic state of aquifer flow, - aquifer regime, which is determined by certain laws, phenomena and distribution of factors, ...
    ... infiltration and boundary conditions: river, general head boundary, drainage, specified discharge - drainage wells, specified discharge - “no flow” cells, and flow barrier. Among the so-called initial conditions, which characterize the piezometric head at a certain initial time, groundwater levels of ...
    ... geology, pp. 483-487. RAPANTOVA, N. et al. (2007) Ground Water Flow Modelling Applications in Mining Hydrogeology. Mine Water and the Environment, 26 (4), pp. 264-270. RÜHAAK, W., LUO, J. and DIERSCH, H.-J.G. (2009) 3D Modelling of Brine Flow - A Case Study for a Flooded Salt Mine. In: Proceedings of ...

  • 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

  • Towards Sustainable Management of Transboundary Hungarian-Serbian Aquifer

    Zoran Stevanović, Peter Kozák, Milojko Lazić, Janos Szanyi, Dušan Polomčić, Balazs Kovács, Jozsef Török, Saša Milanović, Bojan Hajdin, Petar Papić (2011)
    ... basis of provided documentation as representative values for the whole layer. Owing to insufficient data of the groundwater regime this initial model covered only steady state flow conditions. The obtained results are useful for preliminary evaluation. They show insignificant regional depletion of ...
    ... Utilization of the Aquifer Systems On the Hungarian side ofthe modei domain a MODFLOW based model was built [8] to investigate the hydrodynamic regime of the shallow acluifers. The preliminary SUDEHSTM hydrodynamical modei was conceived and built as a muitilayer model with ten layers (five wate ...
    ... 17o comes from rainfall within the region. The major rivers are the Danube and the Tisa. At the Hungarian-Serbian border the average annual river flow of the Danube is around 2500 m3 s-1, while for the Tisa the average is 700 m3 s-1. Figure 4.9.1 Location map of study area 4.9 Towards Sustainable ...

  • Threshold-induced correlations in the Random Field Ising Model

    Sanja Janićević, Dragutin Jovković, Lasse Laurson, Đorđe Spasojević (2018)
    Multidisciplinary
    ... correlations in the Random Field Ising Model (RFIM) we performed numerical simulations of its athermal (T = 0) variant in nonequilibrium adiabatic regime. �e athermal RFIM describes a system of N ferromagneti- cally coupled classical Ising spins Si = ±1, located at sites i of some underlying lattice ...
    ... usual real-world sit- uation with two well separated time scales: fast one for spin �ipping, and slow scale for the external �eld. In the limiting regime of in�nitely slow (i.e. adiabatic) driving, the external �eld is kept constant during (any) avalanche. A�er the avalanche dies, H continues to change ...
    ... hysteresis loop. Note that if one repeats the run with the same sample (i.e. same con�guration =h{ }i i N 1 of random �eld), in the same driving regime, and with the same ini- tial conditions, the system response will be the same because the �ipping rule is deterministic. �erefore, reliable www ...

  • Tektonska evolucija severoistočnih Dinarida

    Nikola Ranđelović, Branislav Trivić, Nemanja Krstekanić, Bojan Kostić, Uroš Stojadinović (2022)
    ... shortening formed S2 foliation and dm-m scale open and isoclinal W to SW vergent folds. Subsequently, brittle structures formed in an E-W compressional regime. These include NNW-SSE oriented reverse and NW-SE to ENE-WSW oriented strike-slip faults. The youngest phase activated both ductile and brittle ...

  • Review: Methodological approaches and research techniques for addressing construction and remediation problems in karst reservoirs

    Saša Milanović, Ljiljana Vasić (2021)
    Earth and Planetary Sciences (miscellaneous), Water Science and Technology

  • Ефикасност дистрибуције и коришћења природног гаса у домаћинствима

    Dejan Brkić (2010-03-30)
    Природни гас ће се у будућности све више користити као енергент за подмиривање грејних потреба становништва у српским градовима. Стога је потребно изнаћи најповољнији начин употребе природног гаса. Природни гас се може користити за подмирење грејних потреба становништва на два дијаметрално супростављена начина, и то директно, тако што би се гас директно уводио у зграде путем дистрибутивног система за снабдевање гасом и затим сагоревао у гасном котлу којим је сваки стан опремљен (гасни дистрибутивни систем), или индиректно, тако што ...
    prirоdni gаs, distribuciја gаsа,grејаnjе, cеvоvоdi, cеvоvоdnе mrеžе,fаktоr trеnjа pri prоtоku fluidа,urbаnizаm
    ... umber  and/or  relative pipe  roughness  for all  flow  regimes  from  laminar  through partially  (including  ‘smooth’  hydraulic regime) to fully turbulent flow of natural gas or other fluids.     The  friction  factor  is  related  to  fluid‐flow  rate,  fluid  properties  and  pipe  characteristics  ...
    ... the  Moody diagram.  In  the hydraulically smooth  regime as  typical  for  flow  through PVC pipes,  the  friction  factor  is  a  function  of  Reynolds  number  only  and  the  resistance  to  flow  is  independent  of  relative  roughness. This regime  is restricted to small values of Reynolds numb ...
    ...  Fitting the flow regime in the internal structure of heat transfer  systems. International Communications in Heat and Mass Transfer 33(1), 30‐38. (на  енглеском)    Л ит ер ат ур а  ‐ 191 ‐    122. Goudar, C.T., Sonnad, J.R. 2003. Explicit friction factor correlation for turbulent flow in  smooth pipes ...

  • Hydraulic impact of pressure transients from water conveyance tunnel on the complex hydrogeological system: A case study HPP

    Igor Jemcov, Maja Todorović, Aleksandar Jemcov, Marina Ćuk Đurović (2024)
    Tunel pod pritiskom, Unutrašnji pijezometri, Tranzijenti pritiska, Karstna izdan, Pukotinska izdan, Hidraulički odziv
    ... While slightly lower values were registered on piezometer P2 (above 5500cmHx»O) (Table 2). Pore pressure Discussion During the operational regime of the HPP Pirot, the pore pressure response in the rock mass was influenced by hydraulic transients caused by the opening and closing of the turbines ...
    ... operation involves frequent load changes and generates significant hydraulic transients in the pressure tunnel, creating two characteristic unsteady flow phenomena: water hammer – WH and water mass oscillation – WMO (Fig. 3). The elastic properties of Water lead to the appearance of a hydraulic transient ...
    ... tunnel-Part 1: Guideline for an estimate of groundwater inflow rate Tunn. Undergr. Space Technol. (2010) D.Li et al. Case studies of groundwater flow into tunnels and an innovative Water- gathering system for water drainage Tunn. Undergr. SpL. Tech. (2009) A. Mangin Pour une meilleure connaissance ...

  • Development and Validation of Universal 3D Blast Fragmentation Model

    Veljko Lapčević, Slavko Torbica, Miloš Stojanović, Ivica Vojinović (2023)
    Fluid Flow and Transfer Processes, Computer Science Applications,Process Chemistry and Technology, General Engineering, Instrumentation, General Materials Science

  • Definition of groundwater genesis and circulation conditions of the complex hydrogeological karst system Mlava–Belosavac–Belosavac-2 (eastern Serbia)

    Ljiljana Vasić, Saša Milanović, Zoran Stevanović, Laszlo Palcsu (2020)
    Geochemistry and Petrology

  • 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

  • Why classical sequence stratigraphy doesn't work in Pannonian basin?

    Dejan Radivojević (2018)
    basen iza ostrvskog luka, detačment, miocen, Panonski basen, riftogeneza, sekvenciona stratigrafija
    ...   rift  initiation  is marked with  fast  subsidence  and  creation  of  large  accommodation  space,  while  others  advocate  slow  subsidence  regime  which  formed small accommodation space. Because of half‐graben asymmetry and subsidence is controlled by  one major fault, accomodation space in ...
    ... o 120 km prisutna grupa haotičnih refleksija. Ove refleksije, koju su formirane uz  normalni rased, verovatno vode poreklo od masivnih tokova (mass flow).  Refleksije progradacionih serija u pravcu severozapada slabije su definisane i više haotične usled  smetnji u seizmičkom zapisu. Sekvenca P3 ta ...
    ... d the center, which  is between 65 and 160 km at regional  transect (figure 1). Progradational sequence could be correlate with slope and turbidite flow formations  which were defined  in northwestern part of Pannonian basin  (Juhasz et al., 2007, Sztano et al., 2016,  Ivanišević & Radivojević, 2018) ...

  • Self-Engineering: Possibilities for Maintenance Operations in the Mining Machines Industry

    Steven Manders, Milorad Pantelić, Vladimir Milisavljević, Alberto Martinetti (2021)
    Self-engineering is a relatively new branch of knowledge that aims to understand how systems could “autonomously” re-configure or repair themselves without the intervention of the operators. A direct field of application is within the maintenance spectrum. Having systems or machines capable of self-detecting or even self-repairing could represent a game-changer, in capital asset fields such as the mining industry in particular. This paper aims to investigate the possible benefits and challenges of self-engineering / self-maintenance concerning mining machines, specifically bucket-wheel ...
    self-engineering, self-maintenance, maintenance operations, mining industry, bucket-wheel excavator, gearbox revitalization

  • Legal framework for recultivation of degraded areas caused by mining exploitation

    Radmila Gaćina (2023)
    Prilikom površinske i podzemne eksploatacije uglja eksploatacioni sistemi oštećuju veće ili manje površine zemljišta. Iskustva pokazuju da su oštećenja zemljišta znatno veća kod površinske eksploatacije, gde je prostora degradiran ne samo u konturi rudnika i okoline, već se promene takođe dešavaju u prirodnom okruženju. U članku su predstavljeni rezultati studije zakonskih okvira rekultivacije u nekim zemljama sveta i u Srbiji. Praktično iskustvo rekultivacije pokazalo je da iskorišćenje i devastacija tokom rudarske aktivnosti predstavljaju opasnost ne samo za pogođena ...
    rekultivacija, melioracija, otkopavanje uglja, zakonska regulativa
    ... Directive into national laws and administrative provisions is very different within Europe. For example, in Germany there is one single legislative regime or framework - the national mining law, BBergG (1980) - bringing together all mining operations and the general environmental laws to speed up ...

  • Примена нумеричких метода у моделовању тецишта са освртом на различите реолошке услове

    Јелка Крушић (2023)
    Тецишта су комплексне појаве нестабилности које захтјевају истраживања и испитивањакоја до сада нису рађена код нас у области геотехнике. По механизму, начину активирањаи понашању покренутог материјала се знатно разликују од клизишта. Циљ оведисертације је била примјена нумеричких модела пропагације тецишта на примјеру двијепојаве које су се десиле у Србији као посљедица дјеловања циклона Тамара. Детаљноистраживање тецишта подразумијева теренско картирање, теренска истраживања илабораторијска испитивања одабраних узорака са терена. Од теренских истраживања напримјеру тецишта Селанац урађена су геофизичка истраживања Електричнетомографије док ...
    тециште, нумерички модели пропагације, циклон Тамара, геофизичка истраживања, лабораторијска испитивања, Селанац, Лева река, RAMMS, SPH geoflow, реолошки модел