Energy consumption and CO2 emission reductions trough refurbishment of residential buildings’ roofs by applying the green roof system: Case study

Climate changes which we are experiencing at the moment are affecting the entire globe. Serbia, as a developing country, is in the process of defining its own energy strategy and priorities when it comes to the problem of increased energy consumption in its building stock. Research shows that residential sector consumes the largest quantity of energy. CO2 emissions present another big problem which is in a direct correlation with energy consumption. Green roofs have multiple positive effects on buildings and their surroundings which make them a desirable option for retrofitting roofs. The aim of this paper is to investigate thermal properties of chosen green roof system and its potential to positively influence energy consumption for heating buildings and therefore CO2 emissions trough refurbishing existing old flat roofs. New Belgrade was chosen for this research for its unique urban characteristics - existence of large number of similar or identical buildings, which have same structural characteristics and similar surroundings. For the purpose of this paper, blocks 45 and 70 were chosen. Results of this research are applicable on all of the 132 buildings found at this location, which have total roof area of 90990m2. By calculating energy quantity needed for heating the building with the existing roof and two hypothetical models, which have green roof, it was possible to quantify energy savings, which are in a direct correlation with CO2 emissions. A control roof was introduced in order to examine if the proposed green roof possesses better characteristics than a traditional solution, most commonly used in Serbia. Apart from energy savings, overall impact of the green roof on the CO2 reduction per building was calculated. By multiplying these results, we drew the conclusion that a project such as greening roofs of existing residential buildings in blocks 45 and 70 would have a noticeable effect on both the energy savings and CO2 emissions

Određivanje komponenti odstupanja vertikale primenom globalnog geopotencijalnog modela EGM2008

This paper presents the determination of the vertical deflection components using the Global Geopotential Model EGM2008. The components are defined in two groups of points: 4083 points are relatively correctly distributed across the territory of Serbia and 46 Laplas and geoid points defined in Serbia in the past century, from the set of institutions. All presented determinations in this paper are related to the Geodetic Reference System 1980 (GRS80), with the coordinates of all the points used to refer to the International Terrestrial Frame 1996 (ITRF96). Analysis of the results of the determination showed that the EGM2008 can be used to approximate the astrogeodetic determination with the agreement of several arc seconds.U okviru rada prikazano je određivanje komponenti odstupanja vertikala primenom Globalnog geopotencijalnog modela EGM2008 (Earth Gravitational Model 2008). Komponente su određene u dve grupe tačaka: 4083 tačke relativno pravilno raspoređene po teritoriji Srbije i 46 Laplasovih i geoidnih tačaka koje su određene u Srbiji u prošlom veku, od stane niza institucija. Sva prikazana određivanja u okviru rada odnose se na Geodetski referentni sistem 1980 (Geodetic Reference System 1980 - GRS80), pri čemu se koordinate svih korišćenih tačaka odnose na Međunarodni referentni okvir za epohu 1996 (International Terestrial Frame 1996 - ITRF96). Analizom rezultata određivanja pokazano je da se EGM2008 može koristiti za aproksimaciju astrogeodetskih određivanja sa saglasnošću od nekoliko lučnih sekundi

Photocatalytic application of laser synthesized nanoparticles

U ovom radu ispitivana je mogućnost primene nanočestica ZnO za fotokatalitičku degradaciju boje bromkrezol zeleno i komercijalno dostupne boje za bojenje tekstila. Vodena suspenzija nanočestica ZnO dobijena je laserskom ablacijom [1]. Koncentracija nanočestica određena je metodom ISP-OES. Rastvori boje sa različitim količinama nanočestica izlagani su dejstvu UVC zračenja i to u intervalima od 5 minuta u ukupnom trajanju od sat vremena. Degradacija boja u toku ozračivanja utvrđena je merenjem apsorbancije UV-VIS spektrometrijom pre, tokom i nakon ozračivanja. Preliminarni rezultati potvrdili su početnu pretpostavku da se nanočestice dobijene laserskom sintezom mogu koristiti za degradaciju boja.In this paper, the possible use of ZnO nanoparticles for photocatalytic degradation of dyes, in particular bromocresol green and commercial textile dyes, was examined. А water suspension of ZnO nanoparticles was prepared by laser ablation. Concentration of nanoparticles was measured by ICP-OES technique. Dyes solutions with different amounts of nanoparticles were exposed to UVC irradiation at 5 minute intervals for a total period of 1 hour. Degradation of dyes during irradiation was determined by UV-VIS spectroscopy by measuring solution absorbance before, during, and after exposition. Preliminary results confirmed the initial assumption that laser synthesized nanoparticles could be used for dye degradation.58th Meeting of the Serbian Chemical Society; June 9-10, 2022, Belgrade, Serbia

Crude extracts of cinnamon and oregano spices as components of pullulan based edible films

Pullulan based films were prepared with crude extracts of cinnamon and oregano spices. Obtained films were characterized by FTIR-ATR spectroscopy and their antioxidant and antimicrobial properties were evaluated. These biopolymer based films have potential use in food applications as food ingredients and active packaging material.6th Workshop Specific Methods for Food Safety and Quality, 27.09.2018. Belgrade, Serbi

Bioactive pullulan based edible films with medicinal herbal extracts

In this work, pullulan based films with water extracts of medicinal herbs thyme and sage, were prepared. The resulting films were characterized by FT-IR spectroscopy and their antioxidant and antimicrobial activities were evaluated. These products have potential use in food applications, as a supplement to functional food and/or as coatings for food packaging material

Izolovanje i karakterizacija mikroorganizama visokotolerantnih na perfluorovana jedinjenja

Razvoj hemijske industrije u prošlom veku pozitivno je uticao na životni standard, ali je za sobom ostavio značajne količine toksičnih supstanci u životnoj sredini. Dugotrajne organske zagađujuće supstance (Persistant Organic Pollutants - POPs) su antropogene hemikalije koje se zadržavaju, akumuliraju u lancu ishrane i imaju štetne posledice po zdravlje ljudi i životnu sredinu [1]. Per- i polifluoralkil supstance (PFAS) kao što su perfluorooktanska kiselina (PFOA), perfluorooktan sulfonska kiselina (PFOS) i od 2022. godine perfluoroheksan sulfonska kiselina (PFHxS) se nalaze na listi POPs hemikalija [2]. Publikacije proistekle iz istraživanja na temu PFAS supstanci ukazuju da mikroorganizmi koji su izolovani iz životne sredine zagađene ovim jedinjenjima mogu smanjiti količinu istih usled biosorpcije, ali i potencijalne biotransformacije i biodegradacije [3,4]

Inovativno granulisano organomineralno multikompozitno đubrivo na bazi vermikomposta za stimulisanje respiracije zemljišta – studija na micro-oxymax respirometru

Poster presented at XII Kongres mikrobiologa Srbije sa međunadornim učešćem, Beograd 10-12. maj 2018.Abstract: [https://cherry.chem.bg.ac.rs/handle/123456789/5403