Vol. 7 No. 2 (2017) | Bulletin of Natural Sciences Research

Open Access Original Scientific Paper

INFORMATION AND COMMUNICATIONS TECHNOLOGIES IN FUNCTION OF TEACHING PROCESS

by Nebojša Denić, Snežana Gavrilović, Nataša Kontrec

This paper, based on the extensive research of relevant professional literature, will present and elaborate possible aspects of influence which information-communications technologies (ICT) have on educational process. Contemporary information-communications technologies and their use in teaching process resulted in numerous enhancements of teaching process altering traditional methods of learning and teaching. With the aim of confirming theoretical postulates researches were conducted on candidates with specific educational degrees in various forms of traditional teaching and teaching with educational software. The survey was conducted on a control and experimental group, on a sample of 1542 candidates. The candidates were observed in a period of approximately five months. The results of this research indicate that the candidates taught by use of educational software have shown far greater level of achieved knowledge and significantly higher motivation for learning. The participants of the experimental group actively participated in the acquisition of their competences. The contribution of this paper is in the new methodological approach to the organization of education, which significantly improves the teaching process, its goals and outcomes.

View Full-Text DOI 10.5937/univtho7-15472 Published: 27 Dec 2017

Open Access Original Scientific Paper

MONITORING BUTTERFLY BIODIVERSITY ON PRIME BUTTERFLY AREA Avala Mt. (Serbia) BY THE TRANSECT METHOD (Pollard Walks) IN THE YEAR 2017

by Predrag Jakšić, Franc Janžekovič, Tina Klenovšek

An inventory of butterfly fauna was carried out in 2017 within the north-western part of the Prime Butterfly Area “Avala Mt.”. Butterfly fauna was surveyed with a transect method from March until October within three sectors with different land use and plant succession. We evaluated the sectors by butterfly species richness, abundance of individuals, species accumulation curves, Shannon index, ecological and zoogeographical characteristics. A total of 1147 individuals were recorded, representing 50 species. Three new species (Pieris mannii (Mayer, 1851), Satyrium acaciae (Fabricius, 1787) and Kirinia roxelana (Cramer, 1777)) for the fauna of Avala Mt. were discovered that now counts 114 species. Abandoned dry grasslands in the process of secondary succession supported the highest number of species and individuals. Nevertheless, the observed butterfly species on Avala Mt. were almost equally characteristic for grasslands (38.4%) and forests (34.3%). In conclusion, butterfly biodiversity on Avala Mt. depends on habitat diversity, which is a combination of climax forest vegetation as well as formerly agricultural landscapes in different stages of secondary succession.

View Full-Text DOI 10.5937/univtho7-16037 Published: 26 Dec 2017

Open Access Original Scientific Paper

NOTES ON THE MOORE-PENROSE INVERSE OF A LINEAR COMBINATION OF COMMUTING GENERALIZED AND HYPERGENERALIZED PROJECTORS

by Marina Tošić

The aim of this paper is to give alternate representations of the Moore-Penrose inverse of a linear combination of generalized and hypergeneralized projectors and to provide alternate proofs of the invertibility of some linear combination of commuting generalized and hypergeneralized projectors.

View Full-Text DOI 10.5937/univtho7-13982 Published: 18 Dec 2017

Open Access Original Scientific Paper

REMOTE SENSING MACHINE LEARNING ALGORITHMS IN ENVIRONMENTAL STRESS DETECTION - CASE STUDY OF PAN-EUROPEAN SOUTH SECTION OF CORRIDOR 10 IN SERBIA

by Ivan Potić, Milica Potić

The construction of the Pan-European Corridor 10 is one of the major projects in the Republic of Serbia, and it enters the final phase. A vast natural area suffered a significant change to complete the project and therefore is the existence of a need to monitor those changes. Nature requires adequate and accurate detection of environmental stresses which inevitably arise after implementation of such large construction projects. Conversely to traditional field monitoring of the environment, this paper will present the remote sensing method which includes usage of European Space Agency's Sentinel 2A optical satellite data processed with different Machine Learning algorithms. An accuracy assessment is performed on land cover map results, and change detection carried out with best resulting data.

View Full-Text DOI 10.5937/univtho7-14957 Published: 11 Dec 2017

Open Access Original Scientific Paper

SPATIAL FUNCTIONAL TRANSFORMATION AND TYPOLOGY OF THE SETTLEMENT SYSTEM OF TOPLICA DISTRICT

by Jovan Dragojlović, Dušan Ristić, Nikola Milentijević

Contemporary processes of industralization, urbanization, deagrarianization, the polarization and globalization contribute socio-economic transformation of the observed space as well as the creation of new carrier of functional relationships in space. Towns with its own influences enrich the network of surrounding settlements, strengthen their mutual relations and create a whole functional settlement system of one area , or the gravity of the urban core. By dividing the functions of the primary, secondary and tertiary, the basis and types of settlements are created by functional criteria according to the type of economic activity and the primary content in them. In this area in the second half of the twentieth and early twenty-first century witnessed substantial changes in almost all components of demographic structure, which resulted in the transformation of functional types of settlement, when the predominantly agrarian settlement characteristic of the area of Toplica road went up mixed and service settlement. The idea behind the study is for the geographically complex area to be displayed in the light of socio-economic development, and as a basis for further economic development of this part of the Republic of Serbia.

View Full-Text DOI 10.5937/univtho7-15574 Published: 09 Dec 2017

Open Access Original Scientific Paper

A CONTRIBUTION TO KNOWLEDGE OF THE BALKAN LEPIDOPTERA. SOME PYRALOIDEA (LEPIDOPTERA: CRAMBIDAE & PYRALIDAE) ENCOUNTERED RECENTLY IN SOUTHERN SERBIA, MONTENEGRO, THE REPUBLIC OF MACEDONIA AND ALBANIA

by Colin W. Plant, Stoyan Beshkov, Predrag Jakšić, Ana Nahirnić

Pyraloidea (Lepidoptera: Crambidae & Pyralidae) were sampled in the territories of southern Serbia, Montenegro, the Former Yugoslav Republic of Macedonia and Albania on a total of 53 occasions during 2014, 2016 and 2017. A total of 173 species is reported here, comprising 97 Crambidae and 76 Pyralidae. Based upon published data, 29 species appear to be new to the fauna of Serbia, 5 species are new to the fauna of Macedonia and 37 are new to the fauna of Albania. The data are discussed.

View Full-Text DOI 10.5937/univtho7-15336 Published: 30 Nov 2017

Open Access Original Scientific Paper

PREPARATION OF SILVER AND COPPER NANOPARTICLES IN PRESENCE OF ASCORBIC ACID AND INVESTIGATION OF THEIR ANTIBACTERIAL ACTIVITY

by Bojana Laban, Milena Košanin, Goran Isić, Uroš Ralević, Mirjana Marković, Anja Jokić, Vesna Vasić

In this study, we present a synthesis of silver and copper nanoparticles (NPs) using ascorbic acid as stabilizing and sodium borohydride as reducing agents, respectively. Four colloidal dispersions were obtained, two of them additionally stabilized by gelatin. They were characterized by UV-Vis, AFM, DLS and zeta potential measurements. The size of both silver and copper NPs, determined by AFM measurements, was 10 nm before, and 15 nm after stabilization with gelatin. Antibacterial activity of synthesized NPs was tested using series of gram positive and gram negative bacteria. It was found that Ag and Cu NPs showed antibacterial activity in all cases.

View Full-Text DOI 10.5937/univtho7-14762 Published: 13 Oct 2017

Open Access Original Scientific Paper

RESOLVING SYSTEMS OF NONLINEAR INTEGRAL EQUATIONS VIA C-CLASS FUNCTIONS

by Ljiljana Paunović

Fixed point theorems for monotone operators in ordered metric spaces are widely investigated and have found various applications in differential and integral equations (Nieto & Rodríguez-Lόpez, 2005), (Nieto & Rodríguez-Lόpez, 2007), (Wu, 2008). Motivated by the work in (Agarwal et al., 2012) and (Luong & Thuan, 2011) we study the existence of solutions for a system of nonlinear integral equations in ordered b-metric spaces using the results given in this paper.

View Full-Text DOI 10.5937/univtho7-14709 Published: 07 Sep 2017

Open Access

ON THE AVAILABILITY VERSUS TRANSMITTED POWER OF WIRELESS SENSOR NETWORKS IN RAYLEIGH MULTIPATH FADING ENVIRONMENTS

by Dejan Milić, Jelena Anastasov, Danijel Đošić, Aldis Seferi

This paper presents simulation results for full availability of a wireless sensor network depending on the RF outputpower of the network nodes in Rayleigh multipath fading environment. Outage probability, relating to the situationin which any one of the sensors is unavailable, is computed by means of numerical simulation, and discussed. Theresults indicate that the trade-of between the outage probability and the energy eciency of the network nodes shouldbe sought, resulting in lowest required output power for the highest tolerable outage threshold.

View Full-Text DOI 10.5937/univtho7-15332

Open Access

STARK WIDTHS OF Sc IV SPECTRAL LINES WITHIN 4s-4p TRANSITION ARRAY

by Milan S. Dimitrijević

Stark full widths at half maximum of six 4s-4p Sc IV spectral lines, broadened by collisions with electrons, have been calculated for electron density of 1017 cm-3 by using the modified semiempirical method. The results are provided for temperatures from 10 000 K to 160 000 K. They are used also to discuss the similarities of Sc IV spectral lines within multiplet, supermultiplet and transition array. Obtained results will be included in the STARK-B database which is also a part of Virtual atomic and molecular data center (VAMDC).

View Full-Text DOI 10.5937/univtho7-15815