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Prednost upotrebe modifikovanih poroznih betona za popločavanje u urbanim sredinama
No full textZbog povećanja nivoa urbanizacije gradova i njihovog šireg okruženja, planeta je izložena višem nivou poplava nego što je to bio slučaj prethodnih decenija. Jedan od načina da se ublaže štetni efekti koje urbanizacija gradova ima kako na pojavu poplava, tako i na globalne klimatske promene, jeste upotreba poroznih betonskih ploča spravljenih sa recikliranim materijalima. Pravilnom upotrebom poroznih ploča može se unaprediti kontrola atmosferskih padavina, u smislu usmeravanja vode koja otiče i skupljanja štetnih materija koje atmosferske vode nose.
U radu su prikazane karakteristike poroznih betonskih ploča, izrađenih sa različitim recikliranim materijalima (neutral, leteći pepeo). Reciklirani materijali i nus proizvodi industrije korišćeni su kao delimična (ili potpuna) zamena za cement. Delimična zamena cementa različitim nus proizvodima, vršena je u količinama 0-30%. Rezultati ispitivanja pokazuju da sa povećanjem sadržaja nus proizvoda većima mehaničkih karakteristika poroznih betona opada. Ipak, u zavisnosti od ispitivane betonske mešavine, moguće je odrediti optimalan sadržaj nus proizvoda, tako da mehaničke karakteristike zadovolje zahtevane tehničke propise, uz ekološke prednosti upotrebe takvih betona. Ispitivanja fizičkih i mehaničkih karakteristika su se odnosila na parametre: zapreminske mase, čvrstoće pri pritisku, čvrstoće pri savijanju i upijanja vode
Revisiting the Original Vision: Digital Reconstruction of the Kosmaj Monument’s Hyperbolic Contours
No full textThis paper introduces a method for creating an accurate hyperbola through five given points in CAD environments that lack native conic tools. Unlike numerical approaches, the method relies on purely graphical procedures of defining cones through selected points and extracting their planar sections, which results in a faithfully represented conic—hyperbola. Applied on the Kosmaj Monument, an emblematic example of post-WWII Yugoslav brutalism, the approach enabled reconstruction of its contours as true hyperbolas, rather than the stylized arcs and line segments of the realized structure. Using photogrammetric data and point-cloud analysis from the previous research, the study develops an idealized digital model that resonates with the authors’ original design intent. By balancing geometric rigor with practical accessibility, the method offers advantages for heritage reconstruction, where interpretive reasoning is required. It further highlights the continued relevance of the synthetic geometry approach within standard CAD workflows for design, analysis, and education
Integration of BIM and GIS to reduce construction and demolition waste
No full textEffective management of construction and demolition waste is critical for sustainable development, requiring advanced technologies for detection, logistics, and treatment. Building Information Modeling (BIM) and Geographic Information Systems (GIS) have emerged as valuable tools in this domain. Combining both technologies leverages the detailed accuracy of BIM and the spatial capabilities of GIS, offering a powerful approach to comprehensive waste management. BIM and GIS integration is utilized in all the phases of a construction project's lifecycle. However, most research focuses on operation and maintenance, with fewer studies on planning, design, construction, and end-of-life phases. This chapter analyses the application of BIM and GIS integration in the context of construction and demolition waste minimization for each project phase, highlighting their potential and challenges. A showcase of BIM-GIS integration for digital material stock map creation in Belgrade's neighborhood is presented and enriched with relevant circular economy data to facilitate efficient waste minimization and material reuse
Panta Rhei: a decade of progress in research on change in hydrology and society
No full textTo better understand the increasing human impact on the water cycle and the feedbacks betweenhydrology and society, the International Association of Hydrological Sciences (IAHS) organized thescientific decade “Panta Rhei – Everything Flows: Change in hydrology and society” (2013–2022). A keyfinding is the need to use integrated approaches to assess the co-evolution of human–water systems inorder to avoid unintended consequences of human interventions over long periods of time. Additionally,substantial progress has been made in leveraging new data sources on human behaviour, e.g. throughtext mining of social media posts. Much has been learned about detecting hydrological changes andattributing them to their drivers, e.g. quantifying climate effects on floods. To achieve further progress,we recommend broadening the understanding, the discipline and training activities, while at the sametime pursuing synthesis by focusing on key themes, developing innovative approaches and findingsustainable solutions to the world’s water problems
Understanding Nexus Interlinkages in Extreme Events: A Task Force Initiative Towards Resilience
No full textThis NEXUSNET task force investigates the way in which nine types of extreme events — floods, droughts, wildfires, earthquakes, tsunamis, volcanic eruptions, heatwaves, tornadoes, and landslides — disrupt interconnected systems through cascading Nexus effects. Using over thirty case studies from Europe and beyond, we apply the Nexus Tree methodology to analyse interlinkages across eleven Nexus dimensions: Water, Energy, Food, Ecosystems, Health, Climate, Soil, Land Use, Transport, and Information and Communication Technology (ICT).
For each case, a literature review on nexus implications across all dimensions is conducted, including grey literature. The extent and depth of disruptions are mapped across different timeframes (short-, medium-, and long-term). For example, flood events damage ecosystems through sedimentation and contamination, interrupt food supply by inundating agricultural land, disrupt transport through debris flow, washed-out roads and bridges, disable ICT networks due to infrastructure exposure, and pose serious health risks through the spread of waterborne diseases and reduced access to clean water and healthcare services. Each of these implications triggers a series of cascading effects that multiply risk exposure. Such Nexus implications highlight systemic vulnerabilities extending beyond direct physical damage.
We synthesize findings into a Nexus Interlinkage Matrix generating a distinct Nexus Signature for each extreme event type and identify decoupling strategies across operational, tactical, and strategic levels.
Systemic and transformative approaches such as Nature-based Solutions (NbS) and circular economy strategies are increasingly recognized as effective long-term measures for enhancing resilience. Indicative examples include wetland restoration, which buffers floodwaters and supports biodiversity, and the reuse of treated urban wastewater for agricultural irrigation, which contributes to drought mitigation. These practices illustrate the potential of integrated resource management to address multiple Nexus challenges simultaneously.
This work delivers a robust analytical framework for understanding the multisectoral impacts of extreme events, supporting evidence-based resilience planning in alignment with the Sustainable Development Goals and the One Health Framework.Organisation of the Conference: COST Action NEXUSNET - CA20138 in collaboration with Water Europe, University of Thessaly, Aristotle University of Thessaloniki, with the support of ONE PLANET THESSALY and Resilient Futures by ENRICH GLOBA
Comparison of Total Electron Content Sources Over Europe During Solar Minimum and Maximum Years (2020 and 2024)
No full textIn this paper, we presented a comparison of Total Electron Content (TEC) obtained from various sources: ionosondes, the IRI model, the NeQuick model, and Global Navigation Satellite Systems (GNSS). The study was conducted at multiple locations distributed evenly throughout Europe. We analyzed TEC values from the aforementioned sources during six days per year for 2020 and 2024. In our research, we found that ionosondes generally produce the smallest values of TEC. GNSS data provide TEC with the highest values during quiet periods, while the NeQuick model generates the highest values when solar and geomagnetic activity increases. Based on the correlation coefficient, diurnal variations in TECs from different sources showed significant similarities. Focusing on RMS (root mean square) values of TEC differences, we discovered that several TEC sources produce TECs with a satisfactory level of consistency across Europe. Consistency is around several TECU at solar minimum and within 10 TECU during solar maximum. TECs from the IRI and NeQuick models are highly consistent at both solar periods. During the solar minimum period, there are slightly larger discrepancies between TEC from ionosondes and those from the NeQuick model and GNSS, while other differences stay small. During the solar maximum period, ionosondes and the NeQuick model show the largest differences and variations
A Methodology for Selecting Suitable Sites for Pumped-Storage Hydropower Plants
No full textPorast udela intermitentnih izvora energije (posebno solarnih i vetroelektrana), nameće potrebu za efikasnim skladištenjem energije radi stabilizacije elektroenergetskog sistema. Najznačajniji kapaciteti za tu namenu su reverzibilne hidroelektrane (RHE). U radu je predstavljena nova metodologija za identifikaciju perspektivnih lokacija RHE i pumpno akumulacionih postrojenja pri postojećim hidroelektranama (PAP) – SMART-PSH (Site Mapping And Ranking Technique for Pumped Storage Hydropower plants). Metodologija se zasniva na kombinaciji automatizovanog pretraživanja prostora korišćenjem GIS alata, ekspertske analize lokacija i višekriterijumskog rangiranja potencijalnih sistema. Za izbor perspektivnih RHE i PAP koriste se prostorni odnosi (denivelacija i rastojanje) između akumulacija, hidrološke karakteristike vodotoka i morfološke karateristike akumulacionih prostora. Pored ovih parametara, značajan uticaj na ocenu kvaliteta tih sistema imaju geološke karakteristike sredine, potencijalni uticaji na životnu sredinu, stanovništvo, kulturno-istorijsko nasleđe, infrastrukturu i privredu, kao i blizina saobraćajne i prenosne elektroenergetske mreže i drugi faktori. Rangiranje potencijalnih RHE i PAP vrši se na osnovu velikog broja kriterijuma sa različitim nivoima značajnosti (težinskim koeficijentima).The increasing share of intermittent energy sources, particularly solar and wind power plants, necessitates efficient energy storage to stabilize the power system. The most significant capacity for this purpose is pumped-storage hydropower plants (PSH). This paper presents a new methodology for identifying potential locations for PSH and pump-storage facilities (PSF) at existing hydropower plants – SMART-PSH (Site Mapping And Ranking Technique for Pumped Storage Hydropower plants). The methodology is based on a combination of automated spatial search using GIS tools, expert location analysis, and multicriteria ranking of potential systems. The selection of suitable PSH and PSF sites considers spatial relationships (elevation difference and distance) between reservoirs, hydrological characteristics of the watercourses, and the morphological features of reservoir areas. In addition to these parameters, key factors influencing system evaluation include geological characteristics of the terrain, potential environmental impacts, effects on the population, cultural and historical heritage, infrastructure, and economy, as well as proximity to transportation and power transmission networks, and other factors. The ranking of potential PSH and PSF is conducted based on multiple criteria with varying levels of their significance (weighting coefficients)
Uticaji priliva čistih voda u kanalizaciju na prečišćavanje otpadnih voda
No full textPriliv infiltracije i kišnih voda u kanalizaciju za upotrebljene vode u lokalnim uslovima nije
moguće u potpunosti izbeći, ali ako je priliv ovih voda prevelik može doći do ozbiljnih posledica po
funkcionisanje kanalizacije i postrojenja za prečišćavanje komunalnih otadnih voda. U radu su predstavljeni uzroci i posledice priliva čistih voda u kanalizacioni sistem, sa naglaskom na njihov uticaj na funkcionisanje kanalizacije i efikasnost procesa prečišćavanja otpadnih voda. U uslovima ubrzane izgradnje kanalizacije i postrojenja za prečišćavanje, ukazano je na neophodnost da se ovoj problematici hitno i sistematski posveti odgovarajuća pažnja u Republici Srbiji
Питање (не)униформности смањења губитака у водоводним системима
No full textУ раду је приказана анализа губитака воде из 42 водовода у Републици Србији
коришћењем показатеља ILI и исказивањем губитака као процента од испоручене воде
у систем. Анализа је изведена коришћењем расположивих података, при чему су недо-
стајући подаци усвајaни према оцењеним најреалнијим условима на терену. Анализа
је показала предности коришћења показатеља ILI који уважава локалне специ-
фичности конфигурације и рада водоводног система. Указано је на ризик коришћења
података о губицима исказаним као проценат од воде унете у систем, и нарочито од
арбитрарног прописивања циљаног процента губитака, без анализе стања и кара-
ктеристика конкретног водоводног система, јер овакав приступ може довести до
пoстављања врло нереалних и неостваривих циљева. Приказан је прелиминарни
методолошки оквир за дефинисање циљаних губитака воде у Србији и указано је на
потребе даљих истраживања и унапређења поузданости података о дистрибутивним
водоводним системима у циљу повећања поузданости процене губитака воде и
реалистично постављање циљева смањења губитака водеU radu je prikazana analiza gubitaka vode iz 42 vodovoda u Republici Srbiji korišćenjem pokazatelja ILI i iskazivanjem gubitaka kao procenta od isporučene vode u sistem. Analiza je izvedena korišćenjem raspoloživih podataka, pri čemu su nedostajući podaci usvajani prema ocenjenim najrealnijim uslovima na terenu. Analiza je pokazala prednosti korišćenja pokazatelja ILI koji uvažava lokalne specifičnosti konfiguracije i rada vodovodnog sistema. Ukazano je na rizik korišćenja podataka o gubicima iskazanim kao procenat od vode unete u sistem, i naročito od arbitrarnog propisivanja ciljanog procenta gubitaka, bez analize stanja i karakteristika konkretnog vodovodnog sistema, jer ovakav pristup može dovesti do postavljanja vrlo nerealnih i neostvarivih ciljeva. Prikazan je preliminarni metodološki okvir za definisanje ciljanih gubitaka vode u Srbiji i ukazano je na potrebe daljih istraživanja i unapređenja pouzdanosti podataka o distributivnim vodovodnim sistemima u cilju povećanja pouzdanosti procene gubitaka vode i realistično postavljanje ciljeva smanjenja gubitaka vode
Shake Table Testing of Masonry-Infilled RC Frames with Flexible Joints for Seismic-Resilient Structural Performance
No full textMasonry infills are critical components of reinforced concrete (RC) frame structures that often sustain significant damage, even during moderate earthquakes. Rubber joints have emerged as a promising solution to enhance their performance. However, further experimental and numerical investigations are required to assess their effectiveness under realistic seismic loading conditions.
To address this gap, the H2020 EU-funded FLEJOI project (FLExible JOInts for seismic-resilient design of masonry-infilled RC frames) was conducted within the ERIES framework. As part of this initiative, two identical RC brick-infilled prototypes were constructed at the Dynamic Testing Laboratory of IZIIS in North Macedonia, each incorporating a distinct rubber joint system. One system was designed to reduce the infill stiffness while introducing damping capabilities, whereas the other aimed to fully decouple the infills from the frame. The prototypes underwent a series of shaking table tests to evaluate their seismic performance. A comprehensive set of sensors was installed to monitor key parameters influencing the seismic response of the structures, infills, and joints. This paper presents an overview of the experimental testing campaign and the data generated. These data will support the calibration and validation of numerical models and serve as a foundation for further studies on the seismic performance of RC frames with masonry infills and
rubber joint systems