Search

Immersive Virtual Reality course is, in addition to Basics of Virtual Reality, one of the two courses in applied 3D visualisation offered at the Faculty of Digital Production at the Educons University in Sremska Kamenica, Serbia. The purpose of this course is two-fold: to provide students with a profound understanding of the fundamentals of Virtual Reality and to gain practical experience. The students attending this course learnt about the latest technology of Virtual Reality using the virtual reality headset - Oculus Rift. This paper presents the structure of the Immersive Virtual Reality course, which provides the students of technical orientation with a connection to the state of the art visualisation aspect of digital production. The outcome of the course is the final project, done by each individual student, which involves the implementation of a VR system that students are able to use. The results achieved in the course are displayed and analysed in this paper.

Large capital investments in the purchase of basic equipment for the imperative have the highest possible utilization. One of the indicators of the efficiency of large systems on our open cast mines is production. In addition to this, an extremely important segment also presents failures that cause very high costs due to the standing of the system and their elimination. In this paper an analysis of two bucket wheel excavators type 2000 from the aspect of effective working time, the achieved production and system stagnation with goal to show the influence of individual factors on the final results in the evaluation of the system operation.

M60 M63

M30 M33

M30 M33

Analiza arhitektonskih objekata u pogledu ispitivanja performansi aktuelna je oblast istraživanja u domenu arhitekture i urbanizma. U kontekstu BIM tehnologije i tehnologije virtuelne realnlosti formiran je model koji predviđa njihovu upotrebu u cilju poboljšanja procesa donošenja odluka u arhitektonskom projektovanju. Modelom je predviđena automatizacija analiza koje se mogu sprovesti na idejnom arhitektonskom projektu uz pomoć podataka koji se mogu dobiti korišćenjem BIM tehnologije. U okviru konceptualnog modela zasnovanog na metodu centralnog modela predviđene su višesturke analize od koje se mogu klasifikovati u jednu od tri grupe: Analiza objekta sa ispitivanjem svih ili većeg broja .ifc klasa, analiza pojedinih .ifc klasa i analiza spoljašnjih gabarita objekta. Prema pod-modelima predstavljena je analiza cene koštanja objekta, analiza energetske efikasnosti i analiza godišnje osvetljenosti objekta., Performance based analysis of architectural structures has become an important area of research in the field of architecture and urban planning. The conceptual model is presented in context of BIM and virtual reality technology usage for decision making processes in architecture. The model defines automation of several analysis that can be performed in early design stage of architectural project using data collected from BIM technology software. Multiple analysis are defined in central model framework and classified into three groups: Analysis of the object with the examination of all or a large number of .ifc class, analysis of individual .ifc class and analysis of the external properties of structures. According to these sub-models, analysis of the cost estimate, analysis of energy efficiency and analysis of daylight illumination are presented in dissertation.

Tokom 1987–2013. godine vršena su ispitivanja na planinama Kopaonik, Tara, Maljen i Zlatibor, sa ciljem da se utvrdi sadržaj 137Cs u ovim područjima i njegova migracija kroz lanac ishrane. Specifična aktivnost 137Cs u zemlji, travi, senu, mleku, mlečnim proizvodima, mesu i biljnim čajevima određena je standardnom metodom spektrometrije gama zračenja na poluprovodničkim detektorima. Rezultati pokazuju da je černobiljski radiocezijum i dalje prisutan u životnoj sredini. U svim karikama lanca ishrane: zemljište – biljke – proizvodi životinjskog porekla, tokom 2000–2007. godine na Tari i Maljenu, detektovan je radiocezijum, a najviši stepen kontaminacije nađen je u uzorcima sa područja Maljena. Međutim, u uzorcima sa Kopaonika koji su prikupljeni 2013. godine, radiocezijum nije detektovan u mleku, siru niti u mesu. Razlike u nivou kontaminacije zemljišta na ispitivanim lokacijama posledica su razlika u količini padavina posle černobiljskog akcidenta, nadmorske visine, karakteristika reljefa, sastava zemljišta i vrste biljaka. Najviša specifična aktivnost 137Cs u lekovitom bilju sakupljenom tokom 2011–2012. godine u planinskim područjima, izmerena je u vrsti V. myrtillus To investigate content of 137Cs and its migration through the food chain in mountainous regions in Serbia, environmental samples were collected over 1987–2013. Specific activity of 137Cs in samples of the soil, grass, hay, milk, dairy products, meat and herbal tea plants was determined by standard gamma spectroscopy on semiconductor detectors. Samples from the mountains of Kopaonik, Tara, Maljen and Zlatibor were analysed. The results imply that the Chernobyl radioceasium is still present in the environment. Radioceasium was detected in all parts of the food chain, from the soil, through plants to animal products, in Tara and Maljen over 2000–2007. A higher level of contamination was found in the samples from Maljen. However, 137Cs was not detected in the milk, cheese and meat samples that were collected from Kopaonik during 2013. Differences in the soil contamination noted across the investigated locations are a result of a number of factors, including the amount of precipitation after the Chernobyl nuclear accident, altitude, type of relief, soil and plants. The highest 137Cs specific activity in herbal tea plants that were collected over 2011–2012, is measured in V. mirtillus. Article is part of: [http://vinar.vin.bg.ac.rs/handle/123456789/8230]

Tokom 1987–2013. godine vršena su ispitivanja na planinama Kopaonik, Tara, Maljen iZlatibor, sa ciljem da se utvrdi sadržaj 137Cs u ovim područjima i njegova migracija krozlanac ishrane. Specifična aktivnost 137Cs u zemlji, travi, senu, mleku, mlečnimproizvodima, mesu i biljnim čajevima određena je standardnom metodom spektrometrijegama zračenja na poluprovodničkim detektorima. Rezultati pokazuju da je černobiljskiradiocezijum i dalje prisutan u životnoj sredini. U svim karikama lanca ishrane: zemljište– biljke – proizvodi životinjskog porekla, tokom 2000–2007. godine na Tari i Maljenu,detektovan je radiocezijum, a najviši stepen kontaminacije nađen je u uzorcima sapodručja Maljena. Međutim, u uzorcima sa Kopaonika koji su prikupljeni 2013. godine,radiocezijum nije detektovan u mleku, siru niti u mesu. Razlike u nivou kontaminacijezemljišta na ispitivanim lokacijama posledica su razlika u količini padavina poslečernobiljskog akcidenta, nadmorske visine, karakteristika reljefa, sastava zemljišta i vrstebiljaka. Najviša specifična aktivnost 137Cs u lekovitom bilju sakupljenom tokom2011–2012. godine u planinskim područjima, izmerena je u vrsti V. myrtillus To investigate content of 137Cs and its migration through the food chain in mountainousregions in Serbia, environmental samples were collected over 1987–2013. Specificactivity of 137Cs in samples of the soil, grass, hay, milk, dairy products, meat and herbaltea plants was determined by standard gamma spectroscopy on semiconductor detectors.Samples from the mountains of Kopaonik, Tara, Maljen and Zlatibor were analysed. Theresults imply that the Chernobyl radioceasium is still present in the environment.Radioceasium was detected in all parts of the food chain, from the soil, through plants toanimal products, in Tara and Maljen over 2000–2007. A higher level of contaminationwas found in the samples from Maljen. However, 137Cs was not detected in the milk,cheese and meat samples that were collected from Kopaonik during 2013. Differences inthe soil contamination noted across the investigated locations are a result of a number offactors, including the amount of precipitation after the Chernobyl nuclear accident,altitude, type of relief, soil and plants. The highest 137Cs specific activity in herbal teaplants that were collected over 2011–2012, is measured in V. mirtillus.

Uticaj sredinskog stresa na stabilnost razvića merističkih karakteristika (femoralne pore, subdigitalne lamele, supracilijarne granule) i oblika dorzalne strane glave ispitivan je poređenjem nivoa fluktuirajuće asimetrije (FA) navedenih karakteristika između populacija zidnog guštera (Podarcis muralis) koje naseljavaju urbana i ruralna staništa. Takođe, ispitano je i da li postoje razlike u nivou varijanse simetrične komponente oblika glave, alometriji simetrične komponente oblika i u nivou odstupanja od grupne alometrije između populacija koje naseljavaju ova dva tipa sredina. Pored toga, analizirano je i da li sredinski stres ima uticaja na performansu, kondicioni indeks i prevalencu i intenzitet krvnih parazita kao i da li jedinke koje su zaražene krvnim parazitima i jedinke sa niskim kondicionim indeksom pokazuju viši nivo asimetrije oblika glave. Osnovna hipoteza je bila da će populacije koje naseljavaju suboptimalne uslove životne sredine pokazivati viši nivo FA merističkih karakteristika, viši nivo FA oblika glave, viši nivo varijanse simetrične komponente oblika. Pored toga hipoteza je bila i da će postojati razlike u alometriji simetrične komponente oblika glave, nivou morfološke integracije između dva modula dorzalne strane glave između dva tipa populacija kao i veće odstupanje od grupne alometrije u urbanim populacijama. Takođe, pretpostavka je bila i da će urbane populacije pokazati veću prevalencu i intenzitet krvnih parazita, niži kondicioni indeks ali i da će inficirane jedinke i jedinke sa nižim kondicionim indeksom imati viši nivo FA oblika glave. U poređenju sa ruralnim populacijama, urbane su pokazale statistički značajno viši nivo FA za sve analizirane merističke karakteristike što ukazuje na to da je stabilnost razvića ovih karakteristika u ovoj sredini narušena. Takođe, uočeno je postojanje razlika u razvojnoj stabilnosti između analiziranih karakteristika što ukazuje na to da razvojna stabilnost može biti specifična za morfološke karakteristike. Nivo fluktuirajuće asimetrije je bio niži kod karakteristika koje su od većeg funkcionalnog značaja, što ukazuje da je kontrola razvića ovih karakteristika bila veća. Pored toga, uočeno je i da postoji značajna korelacija između FA femoralnih pora i subdigitalnih lamela što ukazuje na to da su ove karakteristike integrisane... Effects of environmental disturbance on developmental stability of meristic traits (femoral pores, subdigital lamelae, supraciliar granules) and dorsal head shape were evaluated by comparing fluctuating asymmetry (FA) levels between populations of the common wall lizard (Podarcis muralis) inhabiting urban and rural areas. Moreover, possible differences in degree of head shape variation, head shape allometry and in deviation from within-group allometric lines were tested between these two population types. Also, it was analysed whether environmental disturbance affects locomotor performance, condition index, and prevalence and intensity of blood parasites but also if infected animals and animals with low body condition show higher degree of head shape asymmetry. The main hypothesis were that individuals inhabiting suboptimal environments will show higher FA degree of meristic traits and head shape as well as higher degree of head shape variance. Also, it was hypothesised that, due to stressfull conditions, there will be differences in symmetric head shape allometry, differences in the degree of morphological integration between two head modules and differences in the degree of deviation from within-group allometric lines between the two types. Moreover, higher prevalence and intensity of blood parasites and lower body condition were expected in urban populations, as well as higher head shape asymmetry in infected individuals and in individuals with low body condition. Compared to rural populations, the urban ones showed significantly higher degree of FA for all analysed meristic traits, which suggests that developmental stability of these traits is affected in urban environments. Differences in developmental stability were found between the three traits meaning that developmental stability may be trait specific. Degree of fluctuating asymmetry was lower in functionaly significant traits, suggesting that it may be under stricter developmental control. Significant correlation was found between signed FA of femoral pores and subdigital lamelae, possibly a sign of morphological integration as these traits develop in the same body part and it is likely that they share same developmental pathways...