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Wyszukujesz frazę "Stevanovic, D." wg kryterium: Autor


Wyświetlanie 1-8 z 8
Tytuł:
Proposal of new monitoring network of water bodies of karst groundwater in Serbia
Autorzy:
Poledica, M.
Stevanovic, D.
Powiązania:
https://bibliotekanauki.pl/articles/184211.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
assessment
management
river
Opis:
Groundwater resources play a dominant role in water supply in Serbia, and to manage them properly, an assessment of their quantitative and qualitative status must be given. The concept of quality groundwater management is the implementation of EU Water Framework Directive (WFD-2000/6/EC). In this, groundwater monitoring has the highest role, which should provide a comprehensive insight into the quantitative and qualitative characteristics of water in a particular area (Stevanović 2011). The research area in this case is karst landscapes of Serbia. The water bodies of karst groundwater have been identified in the Carpathian-Balkan Mountains of eastern Serbia and in the Dinaric area of western Serbia. Groundwaters of alluvial aquifers along the major rivers are systematically monitored, however, karst and artesian aquifers are not covered by the monitoring network. The current state of monitoring network in the karst of Serbia is, to say the least, unsatisfactory – only the spring of Mlava is observed by the Republic hydrometeorological service of Serbia. EU Water Framework Directive proposes water resource management at the level of river basins, so therefore, prior to network organization, the grouping of existing water bodies of karst groundwater was performed. The basic rule for grouping water bodies is that all bodies must belong to the same river basin and the groups provide reliable data for assessing the status of individual water bodies. Then topographical, geomorphological, hydrographic, geological and hydrogeological characteristics of the terrain were analyzed. According to Poledica (2015) and Stevanović (2015), 25 groups of water bodies in the areas of exploration have been singled out, 13 of them in western and 12 in eastern Serbia. For each group a representative monitoring network has been determined. 104 observation facilities have been selected in the domain of quantity and 53 facilities in the quality domain. This is the total number of observation points that are further sorted by priority. Including the economic factor, it is proposed to gradually develop monitoring networks. Beginning of observation will start in a period of 5 years from now, when observation facilities of first priority (springs of water supply) will be included. The observation facilities of second priority will be included in a period of 10 years from now and those of third priority will be included by 2035. Karst springs and purpose-built piezometers within the source where there are already wells for water supply provide the largest numbers of observation points. Also, hydrological stations are located on watercourses near karst springs where flows during the dry period of the year will be monitored. The final results are presented in the form of hydrogeological maps of Eastern and Western Serbia, which contain water bodies with observation points. These maps were made using the software package ArcGIS. On all facilities, it has been determined which parameters will continuously be monitored (content of observation) and how often (frequency of observation). The level of water will be observed continuously on the places where piezometers will be drilled. Discharge of springs will be observed each other day. Discharge regime of karst springs is studied enough only after many years of research. The reconstruction of monitoring network is suggested after six years. Microbiological and bacterial composition will be observed at least six times a year and other qualitative parameters at least four times a year. Spring discharges and level of groundwater belong to quantitative parameters. Dissolved oxygen, pH value, electrical conductivity, nitrates, turbidity and microbiological composition belong to qualitative parameters. It is very important to include all institutions that are the direct users of these resources, especially water supply system, industry and institutes for public health, and ensure the good cooperation and communication between them. studied enough only after many years of research. The reconstruction of monitoring network is suggested after six years. Microbiological and bacterial composition will be observed at least six times a year and other qualitative parameters at least four times a year. Spring discharges and level of groundwater belong to quantitative parameters. Dissolved oxygen, pH value, electrical conductivity, nitrates, turbidity and microbiological composition belong to qualitative parameters. It is very important to include all institutions that are the direct users of these resources, especially water supply system, industry and institutes for public health, and ensure the good cooperation and communication between them.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 122-123
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A single-point method based on distortion power for the detection of harmonic sources in a power system
Autorzy:
Stevanović, D.
Petković, P.
Powiązania:
https://bibliotekanauki.pl/articles/220846.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distortion power
harmonic pollution source detection
power meter
Opis:
This paper describes a new and efficient method for quantifying and detection of the source of distortion caused by a single customer in a case when many other customers exist in a power grid. It is based on measuring distortion power, a component of apparent power that only exists with a nonlinear load. Different definitions for distortion power calculation are investigated. All these definitions show without doubt that the proposed method is feasible. Moreover, this method allows to develop fair and reliable billing schemes for controlling harmonic pollution. Measurement and simulation results confirm the effectiveness and applicability of the method. The proposed solution is suitable for software/hardware upgrade of existing electronic power-meters.
Źródło:
Metrology and Measurement Systems; 2014, 21, 1; 3-14
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long-term planning for open pits for mining sulphide-oxide ores in order to achieve maximum profit
Planowanie długoterminowe wydobycia rudy siarczkowej w kopalniach odkrywkowych w celu uzyskania maksymalnego poziomu zysków
Autorzy:
Krzanovic, D.
Conic, V.
Stevanovic, D.
Kolonja, B.
Vaduveskovic, J.
Powiązania:
https://bibliotekanauki.pl/articles/220057.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
planowanie długoterminowe
optymalizacja
bio-wypłukiwanie
ługowanie kwasowe
wartość bieżąca netto (NPV)
long term planning
optimisation
bioleaching
acid leaching
net present value
Opis:
Profitable exploitation of mineralised material from the earth’s crust is a complex and difficult task that depends on a comprehensive planning process. Answering the question of how to plan production depends on the geometry of the deposit, as well as the concentration, distribution, and type of minerals in it. The complex nature of mineral deposits largely determines the method of exploitation and profitability of mining operations. In addition to unit operating costs and metal prices, the optimal recovery of and achievement of maximum profit from deposits of sulphide-oxide ores also depend, to a significant extent, on the level of technological recovery achieved in the ore processing procedure. Therefore, in defining a long-term development strategy for open pits, special attention must be paid to the selection of an optimal procedure for ore processing in order to achieve the main objective: maximising the Net Present Value (NPV). The effect of using two different processes, flotation processing and hydrometallurgical methods (bioleaching acid leaching), on determining the ultimate pit is shown in the case of the Kraku Bugaresku-Cementacija sulphide-oxide ore deposit in eastern Serbia. Analysis shows that the application of hydrometallurgical methods of processing sulphide-oxide ore achieved an increase in NPV of 20.42%.
Przynosząca zyski eksploatacja kopalin wydobywanych ze skorupy ziemskiej jest zadaniem złożonym i trudnym, wymagającym całościowego planowania. Aby określić w jaki sposób zaplanować prace wydobywcze, należy uwzględnić geometrię złoża, a także rozkład, koncentrację i rodzaj zawartych w złożu minerałów. Złożony charakter złóż minerałów w dużej mierze determinuje wybór metod wydobycia oraz poziom zysków. Obok jednostkowych kosztów produkcji oraz cen metali, optymalna eksploatacja złóż rud siarczkowych i osiągniecie maksymalnych zysków w dużej mierze zależą także od zastosowanych technologii uzyskiwania metalu z rud. Przy definiowaniu długoterminowej strategii wydobycia rud w kopalni odkrywkowej uwzględnić także należy wybór optymalnej metody obróbki rud w celu uzyskania założonego celu: maksymalizacji wartości bieżącej netto (NPV – Net Present Value). Wykorzystanie dwóch procesów: flotacji oraz metod hydro-metalurgicznych (bio-wypłukiwanie, ługowanie) przedstawiono dla rozważanego przypadku kopalni odkrywkowej rudy siarczkowej eksploatującej złoże w regionie Kraku-Bugaresku-Cementacija we wschodniej Serbii. Analizy wskazały, że zastosowanie metod hydro-metalurgicznych zapewnia wzrost wartości bieżącej netto o 20.42%.
Źródło:
Archives of Mining Sciences; 2017, 62, 4; 807-824
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perception of economic reality - a national security requirement for education in the information age
Postrzeganie rzeczywistości ekonomicznej - krajowe wymogi bezpieczeństwa edukacji w społeczeństwie informacyjnym
Autorzy:
Đurđević, Dragan Ž.
Stevanović, Miroslav D.
Powiązania:
https://bibliotekanauki.pl/articles/1788545.pdf
Data publikacji:
2018-10-09
Wydawca:
Państwowa Uczelnia Stanisława Staszica w Pile
Tematy:
High-frequency trading
Financialisation
Cognitive capacity
Creative thinking
Judgement
Handel wysokiej częstotliwości
System finansowy
Potencjał poznawczy
Twórcze myślenie
Ocean
Opis:
In this article, we consider a specific of the ability of a state to protect its essential values: the capacity of its intellectual elite to objectively perceive current economic realities and their potential consequences. We approach this problem phenomenologically, referring to situations characterised by the lack of a theoretical basis, in whicz highly qualified individuals participated without awareness of their consequences for the stability and essential values of the state. We view these situations from the standpoint of the prevailing educational system whicz produced the personel involved in such operations, and within the context of the need of a political community to maintain the capacity to perceive challenges to its essential values. The results indicate the opportunism of highly educated professionals with respect to theoretical knowledge and the consequent inadequacies in dealing with complex variables whicz generate challenges for national security. We conclude that in the information age, whicz is characterised by complexity, speed and large quantities of available information, decision-making related to national security requires more creative thinking, and this entails a need for higher education to focus not merely on problem-solving, but also on the development of cognitive capacity and prudence.
W artykule dokonano obserwacji zdolności państwa do ochrony wartości życiowych, zdolności intelektualnej elity do obiektywnego postrzegania aktualnych realiów ekonomicznych i ich potencjalnych konsekwencji. Problem ten jest postrzegany fenomenologicznie z uwagi na wybrane sytuacje charakteryzujące się brakiem podstaw teoretycznych kapitału ludzkiego. Wyniki wskazują na oportunizm wysoko wykształconych specjalistów w zakresie wiedzy teoretycznej, a co za tym idzie, niedoskonałości w obliczu złożonych zmiennych, które stanowią wyzwania dla bezpieczeństwa narodowego. Wnioskujemy, że w erze informacji, która charakteryzuje się złożonością, szybkością i dużą ilością dostępnych informacji, podejmowanie decyzji związanych z bezpieczeństwem narodowym wymaga bardziej kreatywnego myślenia, co nakłada na szkolnictwo wyższe potrzebę skoncentrowania się, oprócz rozwiązywania problemów, na rozwijaniu zdolności poznawczych i roztropności.
Źródło:
Progress in Economic Sciences; 2018, 5; 7-18
2300-4088
Pojawia się w:
Progress in Economic Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
National, regional and international interoperability of Croatian healthcare information system
Autorzy:
Mauher, M.
Schwarz, D.
Stevanović, R.
Varga, S.
Powiązania:
https://bibliotekanauki.pl/articles/309533.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
health ICT implementation strategy
healthcare functional requirements
healthcare standards
electronic health record
integrated healthcare
agent based software technology
healthcare computer
communication network healthcare pilot implementation
Opis:
Croatian national health ICT implementation strategy is determined by Croatian national health strategy and plan, Croatian ICT development strategy for 21st century, and requirements specifications for the health information system. National health ICT implementation strategy components are accented: purpose of the ICT implementation strategy, information principles, needs and ICT enablement in domains of patients, healthcare professionals, policymakers and managers and public. Telemedicine and telecare positions and implementation steps are described. Based on the determinants, three organizational levels have been established - government, ministerial and project levels. General architecture of Croatian healthcare information system and respective pilot projects and results of pilot implementations as well as national ICT environmental accelerators for health ICT implementations are presented.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 4; 5-17
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of municipal waste management systems using LCA. South Backa waste management region. A case study
Autorzy:
Stepanov, J.
Ubavin, D.
Prokic, D.
Budak, I.
Stevanovic-Carapina, H.
Stanisavljevic, N.
Powiązania:
https://bibliotekanauki.pl/articles/207535.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
costs
environmental management
life cycle
waste incineration
waste treatment
koszty
zarządzanie środowiskiem
cykl życia
spalanie odpadów
utylizacja odpadów
Opis:
The Republic of Serbia as a candidate country for the EU is obliged to comply with EU directives. This refers to the waste management sector as well. Different goals need to be fulfilled and the current waste management practice has to be improved in order to meet all regulatory EU requirements. Therefore, any piece of information that would support future waste management decisions is of great significance for developing and streamlining future strategies. The life cycle assessment (LCA) is a popular tool widely used for assessment of environmental impacts of waste management systems. This paper focuses on a LCA of four waste management scenarios used in selected region in Serbia (South Backa) and five indicators for the comparison and evaluation of municipal solid waste management strategies. The analysis includes the current situation of waste management in this region, as the base scenario, and three alternative scenarios. The combined life cycle inventory (LCI) model and life cycle impact assessment (LCIA) method has been used to evaluate the municipal solid waste system with the purpose of identifying environmental benefits and disadvantages, as well as economic cost of defined scenarios of waste management systems that could be implemented. The results clearly indicate the difference between the scenarios and show the influence of implementation of composting, RDF treatment, incineration and increased recycling rates on the environmental performance and economic cost of municipal solid waste management in the South Backa region.
Źródło:
Environment Protection Engineering; 2018, 44, 3; 33-49
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intrastriatal pre-treatment with L-NAME protects rats from diquat neurotoxcity
Autorzy:
Djukic, M.
Jovanovic, M.
Ninkovic, M.
Stevanovic, I.
Curcic, M.
Topic, A.
Vujanovic, D.
Djurdjevic, D.
Powiązania:
https://bibliotekanauki.pl/articles/51686.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2012, 19, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nontrivial variations of morpho-anatomical leaf traits in natural south-eastern populations of vaccinium species from Central Balkans
Autorzy:
Bjedov, I.
Obratov-Petkovic, D.
Rakonjac, V.
Skocajic, D.
Bojovic, S.
Markovic, M.
Dajic-Stevanovic, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2142112.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Analysis of Variance
climate factors
Cluster Analysis
elevational gradient
Principal Component Analysis
Serbia
intraspecific and interspecific variability
Opis:
Morpho-anatomical characteristics of Vaccinium myrtillus, V. uliginosum and V. vitis-idaea leaves from several sites of the Central Balkans were examined. The aim of this study was to investigate for the first time morpho-anatomical leaf traits of these species in the studied populations and to identify traits that follow a specific trend along the gradients of climate factors. Leaf traits that discriminate Vaccinium species were as follows: depth of the adaxial cuticule (AdC), thickness of the palisade tissue (PT), thickness of the spongy tissue (ST), height of the abaxial epidermal cells (AbE), height of the abaxial cuticule (AbC) and leaf thickness (LT). Populations of V. myrtillus were characterized by the smallest, and populations of V. vitis-idaea by the highest values for AdC, PT, ST, AbE and LT. Additionally, AbC was significantly larger for V. uliginosum in comparison to two other species. On the basis of morpho-anatomical traits, intraspecific variability of the studied species was explored by Principal Component Analysis (PCA), Cluster Analysis (CA) and Analysis of Variance (ANOVA). CA based on 10 morpho-anatomical traits showed that populations of V. myrtillus and V. uliginosum that grew at lower altitudes (characterized by higher mean annual temperature) are more similar to each other. Especially V. myrtillus was responsive to the elevational gradient and exhibited the highest plasticity in morpho-anatomical leaf traits. Populations of V. vitis-idaea had a different pattern of differentiation along the elevational gradient. CA showed that the populations at the lowest and at the highest altitudes were more similar according to the morpho-anatomical leaf traits, meaning that evergreen leaves were more resistant to environmental conditions.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2021, 63, 2; 7-16
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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