An Outline for an Ecological Portrait of the Youth

Tekst sadrži neke rezultate empirijskog istraživanja realizovanog sredinom 1989. godine na reprezentativnom uzorku kojim je obuhvaćeno 2.000 mladih u Srbiji Rezultati istraživanja su obrađeni, studija koja objedinjuje nalaze istraživanja je privedena kraju i u toku su pripreme za štampu. Istraživanje je realizovao istraživačko-izdavački centar republičke konferencije omladine Srbije. Istraživanjem su registrovani različiti indikatori ekološke svesti mladih, koje smo doveli u vezu s brojnim potencijalnim socio-demografskim korelatima — polom, starošću, obrazovnim, socio-profesionalnim i imovinskim statusom, socijalnim poreklom i drugim obeležjima ispitanika. Izdvojili smo nekoliko »slika« koje mogu da nas uvedu u temu skupa — humanu ekologiju.The text contains part of the results of a survey carried out in mid 1989 on a representative sample of 2000 youths in Serbia. The data have been analysed, the report incorporating the survey’s findings completed and preparations for publishing are under way. The research has been performed by the Research and Publishing Centre of the Republican Conference of the Youth of Serbia. Registered by the survey are different indicators of the youths’ ecological awareness brought into correlation with numerous potential sociodemographic correlates — sex membership, age, educational, socioprofessional and economic status, social heritage and other characteristics of the respondents. We have selected a few »images« for introducing human ecology — the topic of this gathering

Praćenje kvaliteta vode korišćenjem zooplanktonskih organizama kao bioindikatora na šaranskom ribnjaku 'Dubica', Srbija

The quality of water at the Dubica Fish Farm was evaluated by the saprobiological method using the Pantle-Buck saprobity index, during one carp production cycle in the year 2000. By qualitative and quantitative analysis of the zooplankton community, bioindicator species were selected for evaluation of water quality. During the whole period of research, the saprobity index indicated class II water quality, which is suitable for rearing carp in a semi-intensive system as far as natural food is concerned. There was a general trend of decrease in the saprobity index from the beginning to end of the season, its values ranging from 2.05 do 1.77, and a gradual improvement of water quality towards the end of the season. This is partly a result of natural processes (terminated degradation of introduced organic matter as well as settlement of suspended matter introduced with the supply water) and partly a consequence of the application of ichthyological, agrotechnical, and hydrotechnical measures.Tokom proizvodne sezone gajenja šarana u 2000. godini na ribnjaku "Dubica", u cilju praćenja kvaliteta vode primenjena je biološka metoda izračunavanja indeksa saprobnosti po Pantle-Buck-u. Kvalitativnom i kvantitativnom analizom zajednice zooplanktona izdvojeni su bioindikatori na osnovu kojih je određen kvalitet vode u ispitivanom ribnjačkom jezeru. Tokom celog perioda istraživanja, indeks saprobnosti je bio u granicama II klase kvaliteta vode, što je za šaranske ribnjake sa poluintenzivnim sistemom gajenja poželjno sa stanovišta produkcije prirodne hrane. Vrednosti indeksa saprobnosti su imale i generalni trend opadanja od početka prema kraju sezone, od 2,05 do 1,77, odnosno došlo je do postepenog poboljšanja kvaliteta vode jezera u drugom delu sezone. Ovaj proces je do izvesne mere rezultat prirodnih procesa (završene razgradnje unetih organskih materija vodom, kao i taloženja suspendovanih materija unetih svežom vodom), a delom primene agrotehničkih i hidrotehničkih mera

Klaster analiza klonova autohtone sorte Kreaca (Vitis vinifera L.)

The purpose of this paper was to characterize the clones obtained from Kreaca, autochthonous grapevine cultivar of Banat. Based on examination of 6 important biological and technological properties, phenotypic and genetic divergence of 28 selected clones was established. The divergence was determined using ANOVA and hierarchical cluster analysis. Using variance analysis, for grape weight, yield, total acid content, sugar content and sugar/acid ratio very significant or significant differences were obtained between clones. The UPGA method was used and the Euclidean distance in order to determine the difference between the groups. Two clone groups were obtained on the dendrogram. The objective of clone differentiation was primarily cluster weight, although other properties were taken into account as well. As the most perspective clones for further investigation and production, that can be recommended, were clones 12/5/5, 56/11/7 and 69/11/7.U periodu od 2006 do 2008. godine, u zasadima vinove loze 'Vršački vinogradi' u Gudurici, izvršene su sanitarna i masovna pozitivna selekcija sorte vinove loze Kreaca. Sa ukupne površine od 12 ha, na osnovu šest značajnih bioloških i tehnoloških karakteristika izdvojeno je 28 klonova. Primenom ELISA testa kod svih ispitivanih klonova nije utvrđeno prisustvo sledećih ekonomski značajnih virusa: Nepovirus Grapevine fanleaf virus (GFLV), clostero virusa, Grapevine leafroll-associated virus 1(GLRaV-1), Grapevine leafroll-associated virus 2(GLRaV-2) i Grapevine leafroll-associated virus 3(GLRaV-3). Primenom ANOVA i hijerarhijske klaster analize određena je divergentnost klonova. Analizom varijanse ustanovljene su veoma značajne ili značajne razlike između klonova za masu grozda, prinos, sadržaj ukupnih kiselina, sadržaj šećera i odnos šećera i kiselina. Fenotipska divergentnost između klonova ustanovljena je primenom hijerarhijske klaster analize. Korišćen je UPGA metod, pri čemu je razlika između grupa izražena preko Euklideanovog rastojanja. Na dobijenom dendrogramu izdvojene su dve grupe srodnih klonova. Prvu grupu čine 11 a drugu 17 klonova. Kao najperspektivniji, za kolekcionisanje i dalje širenje u proizvodnji, mogu se preporučiti klonovi 12/5/5, 56/11/7 i 69/11/7

Raw material studies of West Central Serbia

This paper deals with raw material problems in the territory of West Central Serbia geologically determined as the Čačak-Kraljevo (or West Morava) basin. Our research is presented through the most striking case studies, Lojanik, Vlaška Glava and Lazac.  The Lojanik hill is a silicified forest by origin. It has occasionally been in use from the earliest periods of prehistory until today as a source of black and ochre-coloured flint, opal and silicified wood. A detailed prospection, including the mapping of surface finds using square nets, was conducted during two research campaigns.The Vlaška Glava is an open-air Palaeolithic site at which artefacts made of white, ochre, red, brown and black chert, silicified magnesite, volcanic and metamorphic rocks were found. Our research of primary and secondary geological deposits in the vicinity of the site showed equivalent raw material. We also found an interesting primary deposit of high quality bluish grey flint with outcrop activities (Workshop 1).The Lazac shaft is a contemporary magnesite mine, recently abandoned because of the high percentage of silicon-dioxide. We determined the same raw material in collections found at nearby Neolithic sites. Certain similarities between the wooden support systems of ore exploration in the Middle Ages and modern times were established at the entrance of the shaft.Our research in the territory of the West Morava basin resulted in reconstruction of some links between geological deposits and settlements and also creation of a relevant base for future raw material studies

HYBRID NEURAL LUMPED ELEMENT APPROACH IN INVERSE MODELING OF RF MEMS SWITCHES

RF MEMS switches have been efficiently exploited in various applications in communication systems. As the dimensions of the switch bridge influence the switch behaviour, during the design of a switch it is necessary to perform inverse modeling, i.e. to determine the bridge dimensions to ensure the desired switch characteristics, such as the resonant frequency. In this paper a novel inverse modeling approach based on combination of artificial neural networks and a lumped element circuit model has been considered. This approach allows determination of the bridge fingered part length for the given resonant frequency and the bridge solid part length, generating at the same time values of the elements of the switch lumped element model. Validity of the model is demonstrated by appropriate numerical examples