Issue 2015-4.
http://arhiva.nara.ac.rs/handle/123456789/1539
www.jageng.agrif.bg.ac.rs/files/casopis/PT_04-2015.pdf2024-03-29T11:41:01ZBuilding Capacity of Serbian Agricultural Education to Link With Society “Casa” - Part 3. Courses and NaRA
http://arhiva.nara.ac.rs/handle/123456789/1551
Building Capacity of Serbian Agricultural Education to Link With Society “Casa” - Part 3. Courses and NaRA
Poleksic, Vesna; Topisirovic, Goran
Energy Productivity of Photovoltaic Cells in Nitra
http://arhiva.nara.ac.rs/handle/123456789/1550
Energy Productivity of Photovoltaic Cells in Nitra
Cviklovic, Vladimír; Palkova, Zuzana; Olejar, Martin; Petrovic, Ana
This contribution is oriented to measurement and evaluation of the
obtained energy from photovoltaic cells efficiency in practice conditions. Photovoltaic
cells were monitored during one year in Nitra, Slovakia. Cells are monocrystalline with
surface 1.95 m2 and in full measurement time are directed perpendicular to the sun rays.
Tracking and stationary systems were used for results evaluation. Six cells per system
are used in the combined serial-parallel connection. Output energy from both systems is
496.257 kWh. Price of obtained energy is 69.48 EUR for actual price of electric energy,
which is 0.14 EUR per kWh. The output power of the photovoltaic tracking system was
higher by 20.39% opposite to stationary system.; Ovaj rad se bavi merenjem i ocenom efikasnosti dobijene energije iz
fotonaponskih ćelija u praktičnim uslovima. Fotonaponske ćelije su bile praćene tokom
jedne godine u Nitri, Slovačka. Ćelije su monokristalne, površine 1.95 m2 i tokom punog
merenja usmerene upravno na sunčeve zrake. Za ocenu rezultata su korišćeni praćenje i
stacionarni sistemi. Šest ćelija po sistemu su upotrebljene u kombinovanoj serijskoparalelnoj
vezi. Izlazna energija iz oba sistema je 496.257 kWh. Cena dobijene energije
iznosi 69.48 EUR po trenutnoj ceni električne energije, što je 0.14 EUR za 1kWh.
Izlazna snaga fotonaponskog sistema praćenja bio je viši za 20.39% u poređenju sa
stacionarnim sistemom.
Investigation of Through Porosity of Oxide Ceramic Coatings Formed by Plasma Electrolytic Oxidation
http://arhiva.nara.ac.rs/handle/123456789/1549
Investigation of Through Porosity of Oxide Ceramic Coatings Formed by Plasma Electrolytic Oxidation
Kuznetsov, Yury; Chernyshov, Nikolay
The article presents the results of investigation of through porosity of
oxide ceramic coatings obtained by plasma electrolytic oxidation (PEO) on the
aluminum parts surfaces, restored by soldering. The optimal modes and electrolyte
composition for plasma electrolytic treatment of the restored surfaces are recommended
to obtain oxide ceramic coatings with minimum through porosity and high coating and
corrosive resistance.; U ovom radu su predstavljeni rezultati ispitivanja unutrašnje poroznosti
oksidno keramičkih prevlaka nanetih plazma elektrolitičkom oksidacijom (PEO) na
površine aluminijumskih delova, restauriranih lemljenjem. Za optimalne elektrolitičke
sastave za plazma elektrolitički tretman restauriranih površina preporučene su oksidne
keramičke prevlake sa minimalnom unutrašnjom poroznošću, visokom pokrivenošću i
otpornošću prema koroziji.
Cost Assessment of the Combined Rainwater Harvesting with Solar Irrigation
http://arhiva.nara.ac.rs/handle/123456789/1548
Cost Assessment of the Combined Rainwater Harvesting with Solar Irrigation
Taskin, Onur; Vardar, Ali
Water availability is becoming acute in all over the world. Increased water
demands have generated interest in different systems. Rainwater harvesting is one of the
promising way to meet water demand for agricultural irrigation. However, water
transmission between water resources and the field requires energy. There are several
ways for powering irrigation systems. One of the options is to use solar panels as an
alternate energy source, and it is mainly use in where there is no electricity. This study
represents the analysis of combined rainwater harvesting with monocrystalline or
polycrystalline or amorphous silicon solar power based irrigation systems. The study
found for all solar powered irrigation cost huge because of primary investment.
Nevertheless, the need for fossil fuel can be decreased by using solar panels and
proposed solution for the present energy crisis for the farmers.; Dostupnost vode postaje otežana širom sveta. Povećane potrebe za vodom
povećale su interesovanje za različitim sistemima. Sakupljanje kišnice je jedan od načina
koji obećavaju zadovoljenje potreba za vodom za navodnjavanje u poljoprivredi. Prenos
vode od izvora do parcela zahteva energiju. Postoji nekoliko načina za pogon sistema za
navodnjavanje. Jedna od opcija je upotreba solarnih panela kao alternativnog izvora
energije koji se koristi tamo gde nema električne energije. Ovaj rad predstavlja analizu
sakupljanja kišnice sa navodnjavanje sa monokristalnim, polikristalnim ili amorfnosilikonskim
solarnim pogonom sistema za navodnjavanje. Rezultati su pokazali da su za
svako navodnjavanje sa solarnim pogonom bili veliki troškovi zbog velikih primarnih
ulaganja. Ipak, potrošnja fosilnih goriva može da bude smanjena upotrebom solarnih
panela i ovo može da bude rešenje za sadašnju energetsku krizu.