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.
{"title":"MONITORING BUTTERFLY BIODIVERSITY ON PRIME BUTTERFLY AREA Avala Mt. (Serbia) BY THE TRANSECT METHOD (Pollard Walks) IN THE YEAR 2017","authors":"P. Jakšić, F. Janžekovič, Tina Klenovšek","doi":"10.5937/UNIVTHO7-16037","DOIUrl":"https://doi.org/10.5937/UNIVTHO7-16037","url":null,"abstract":"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.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43035134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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.
{"title":"REMOTE SENSING MACHINE LEARNING ALGORITHMS IN ENVIRONMENTAL STRESS DETECTION - CASE STUDY OF PAN-EUROPEAN SOUTH SECTION OF CORRIDOR 10 IN SERBIA","authors":"Ivan Potić, M. Potić","doi":"10.5937/UNIVTHO7-14957","DOIUrl":"https://doi.org/10.5937/UNIVTHO7-14957","url":null,"abstract":"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.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44775519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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).
{"title":"STARK WIDTHS OF Sc IV SPECTRAL LINES WITHIN 4s-4p TRANSITION ARRAY","authors":"M. Dimitrijević","doi":"10.5937/univtho7-15815","DOIUrl":"https://doi.org/10.5937/univtho7-15815","url":null,"abstract":"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).","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71153457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In Serbia, there are several sites from the Neolithic period, but there is only one site from the period of existence of the Vinca-Tordos family (5500-4800 BC). In this paper, we will try to become familiar with the site named Plocnik by using two methods. This site is one of many archeological sites in Serbia, but it stands out uniquely because it is under state protection. The methods to be applied are GAM model and tourist valorization.
{"title":"GAM MODEL AND TOURIST VALORIZATION OF GEOSITES PLOČNIK","authors":"M. Stankovic, Stevan Milovanović","doi":"10.5937/univtho7-14161","DOIUrl":"https://doi.org/10.5937/univtho7-14161","url":null,"abstract":"In Serbia, there are several sites from the Neolithic period, but there is only one site from the period of existence of the Vinca-Tordos family (5500-4800 BC). In this paper, we will try to become familiar with the site named Plocnik by using two methods. This site is one of many archeological sites in Serbia, but it stands out uniquely because it is under state protection. The methods to be applied are GAM model and tourist valorization.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"7 1","pages":"24-31"},"PeriodicalIF":0.0,"publicationDate":"2017-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42163735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper the efficiency of accelerated gradient descent methods regarding the way of determination of accelerated factor is considered. Due to the previous researches we assert that the use of Taylor’s series of posed gradient descent iteration in calculation of accelerated parameter gives better final results than some other choices. We give a comparative analysis of efficiency of several methods with different approaches in obtaining accelerated parameter. According to the achieved results of numerical experiments we make a conclusion about the one of the most optimal way in defining accelerated parameter in accelerated gradient descent schemes.
{"title":"Determination of accelerated factors in gradient descent iterations based on Taylor's series","authors":"Milena J. Petrović, Nataša Kontrec, S. Panic","doi":"10.5937/UNIVTHO7-14337","DOIUrl":"https://doi.org/10.5937/UNIVTHO7-14337","url":null,"abstract":"In this paper the efficiency of accelerated gradient descent methods regarding the way of determination of accelerated factor is considered. Due to the previous researches we assert that the use of Taylor’s series of posed gradient descent iteration in calculation of accelerated parameter gives better final results than some other choices. We give a comparative analysis of efficiency of several methods with different approaches in obtaining accelerated parameter. According to the achieved results of numerical experiments we make a conclusion about the one of the most optimal way in defining accelerated parameter in accelerated gradient descent schemes.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"7 1","pages":"41-45"},"PeriodicalIF":0.0,"publicationDate":"2017-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46421251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fixed point theorems for monotone operators in ordered metric spaces are widely investigated and have found various applications in differential and integral equations (Nieto & Rodriguez-Lόpez, 2005), (Nieto & Rodriguez-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.
{"title":"RESOLVING SYSTEMS OF NONLINEAR INTEGRAL EQUATIONS VIA C-CLASS FUNCTIONS","authors":"L. Paunović","doi":"10.5937/UNIVTHO7-14709","DOIUrl":"https://doi.org/10.5937/UNIVTHO7-14709","url":null,"abstract":"Fixed point theorems for monotone operators in ordered metric spaces are widely investigated and have found various applications in differential and integral equations (Nieto & Rodriguez-Lόpez, 2005), (Nieto & Rodriguez-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.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44903859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The complexes Li 2 [Ni(1,3-pdta)]•5H 2 O and Li 2 [Cu(1,3-pdta)]•5H 2 O (where 1,3-pdta represents the 1,3-propanediaminetetraacetate anion) have been synthesized and characterized by applying IR and UV-vis spectroscopy. The obtained spectroscopic results of these complexes are discussed in relation to those for Mg[M(1,3-pdta)].8H 2 O complexes (M = Ni(II) and Cu(II)) of known crystal structure.
{"title":"SYNTHESIS AND SPECTROSCOPIC CHARACTERIZATION OF LITHIUM SALTS OF COPPER(II) AND NICKEL(II) COMPLEXES WITH 1,3-PROPANEDIAMINE-N,N,N’,N’-TETRAACETATE","authors":"N. Drašković, D. Gurešić","doi":"10.5937/univtho7-13688","DOIUrl":"https://doi.org/10.5937/univtho7-13688","url":null,"abstract":"The complexes Li 2 [Ni(1,3-pdta)]•5H 2 O and Li 2 [Cu(1,3-pdta)]•5H 2 O (where 1,3-pdta represents the 1,3-propanediaminetetraacetate anion) have been synthesized and characterized by applying IR and UV-vis spectroscopy. The obtained spectroscopic results of these complexes are discussed in relation to those for Mg[M(1,3-pdta)].8H 2 O complexes (M = Ni(II) and Cu(II)) of known crystal structure.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"7 1","pages":"13-16"},"PeriodicalIF":0.0,"publicationDate":"2017-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43755496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper focuses on the voltammetric determination of lead, cadmium and zinc in water. Two ways of determining were investigated: individually and all three metals simultaneously. The experiments were performed using the Potentiometric Stripping Analysis (PSA). Determination of metals in real samples was preceded by preliminary tests. Preliminary investigations were performed in order to determine the optimal conditions of measurement. It was concluded that the process of determining was for most part influenced by: pH, time of metals extraction, stirring rate of the solution and the thickness of the mercury layer on the working electrode. The s mallest concentrations of metals which can be deter mined using this method are: for lead 22.48 μg dm -3 , for cadmium 16.23 μg dm -3 and for zinc 18.75 μg dm -3 . The obtained results deviated from the actual 1.12% for lead, 1.91% for cadmium and 1.81% for zinc. All tests (individually and simultaneously) were conducted from model solution with concentration as follows: 44.96 μg dm -3 for lead, 32.47 μg dm -3 for cadmium and 37.50 μg dm -3 for zinc. The results of individual measurements deviated by 1.02% lead, 1.90% for cadmium and 1.89% for zinc. Simultaneously the contents were lower than real for: −4.58% for lead, cadmium for −1.91% and −1.89% for zinc. For the conditions determined, except for lead, deviations did not exceed ±2% . This indicates that Potentiometric Stripping Analysis is a good way of individual and simultaneous determination of lead, cadmium and zinc and for determination of their concentrations in water (river and groundwater).
{"title":"Development and application of potentiometric stripping analysis","authors":"Ljiljana Babincev, D. Gurešić, R. Simonović","doi":"10.5937/UNIVTHO7-13649","DOIUrl":"https://doi.org/10.5937/UNIVTHO7-13649","url":null,"abstract":"This paper focuses on the voltammetric determination of lead, cadmium and zinc in water. Two ways of determining were investigated: individually and all three metals simultaneously. The experiments were performed using the Potentiometric Stripping Analysis (PSA). Determination of metals in real samples was preceded by preliminary tests. Preliminary investigations were performed in order to determine the optimal conditions of measurement. It was concluded that the process of determining was for most part influenced by: pH, time of metals extraction, stirring rate of the solution and the thickness of the mercury layer on the working electrode. The s mallest concentrations of metals which can be deter mined using this method are: for lead 22.48 μg dm -3 , for cadmium 16.23 μg dm -3 and for zinc 18.75 μg dm -3 . The obtained results deviated from the actual 1.12% for lead, 1.91% for cadmium and 1.81% for zinc. All tests (individually and simultaneously) were conducted from model solution with concentration as follows: 44.96 μg dm -3 for lead, 32.47 μg dm -3 for cadmium and 37.50 μg dm -3 for zinc. The results of individual measurements deviated by 1.02% lead, 1.90% for cadmium and 1.89% for zinc. Simultaneously the contents were lower than real for: −4.58% for lead, cadmium for −1.91% and −1.89% for zinc. For the conditions determined, except for lead, deviations did not exceed ±2% . This indicates that Potentiometric Stripping Analysis is a good way of individual and simultaneous determination of lead, cadmium and zinc and for determination of their concentrations in water (river and groundwater).","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"7 1","pages":"17-23"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71153188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents an analysis of indoor radon measurements carried out in municipality of Zubin Potok, northwestern part of Kosovo and Metohija. Annual measurements in two rooms of each house were performed by solid state nuclear track detectors commercially known as Gammadata. Average indoor ra don concentration in di fferent type of houses varied from 29-326 Bq/m 3 . A di fferent year of house’s construction including various types of building materials were selected for survey. A detail analysis showed that the di fferences in radon concentration occur between various building materials used for construction, flooring level, type of room and behavior of inhabitants. It was found that building materials in some houses contribute additionally to indoor radon.
{"title":"An analysis of factors affecting the high radon concentration in different types of houses","authors":"L. Gulan","doi":"10.5937/univtho7-13753","DOIUrl":"https://doi.org/10.5937/univtho7-13753","url":null,"abstract":"This paper presents an analysis of indoor radon measurements carried out in municipality of Zubin Potok, northwestern part of Kosovo and Metohija. Annual measurements in two rooms of each house were performed by solid state nuclear track detectors commercially known as Gammadata. Average indoor ra don concentration in di fferent type of houses varied from 29-326 Bq/m 3 . A di fferent year of house’s construction including various types of building materials were selected for survey. A detail analysis showed that the di fferences in radon concentration occur between various building materials used for construction, flooring level, type of room and behavior of inhabitants. It was found that building materials in some houses contribute additionally to indoor radon.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"7 1","pages":"51-54"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71153254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The importance of circadian clock in managing of key muscle physiological processes, and therefore the impact on athletic performance is well studied. Specifically chronobiology examines the mechanisms of the biological clock and the consequences of disrupting its rhythm. Although a body of literature indicates that the peak performance of notable indicators of athletic performance exerts mainly in the afternoon and evening hours which is attributed to increased temperature of the body, certain variables such as vigilance, alertness and cognitive domains can influence the shift of the peak performance during the day. In addition, athletes face issues of desynchronization of their circadian rhythm during frequent transcontinental travels, since their performance is reduced and the adjustment of the biological clock requires some recommendations in the training process and behavioral approach. This review focuses on some current studies on endogenous and exogenous factors which affect the circadian rhythm in order to achieve better sport results, evaluation of the impact chronotype through chronometric tests and revising more valuable determinants of sport performance, as well as the application of new mathematical models in individual treatment of recovery of athletes in the phase of resynchronization.
{"title":"The circadian clock and human athletic performance","authors":"B. Vitosevic","doi":"10.5937/UNIVTHO7-13650","DOIUrl":"https://doi.org/10.5937/UNIVTHO7-13650","url":null,"abstract":"The importance of circadian clock in managing of key muscle physiological processes, and therefore the impact on athletic performance is well studied. Specifically chronobiology examines the mechanisms of the biological clock and the consequences of disrupting its rhythm. Although a body of literature indicates that the peak performance of notable indicators of athletic performance exerts mainly in the afternoon and evening hours which is attributed to increased temperature of the body, certain variables such as vigilance, alertness and cognitive domains can influence the shift of the peak performance during the day. In addition, athletes face issues of desynchronization of their circadian rhythm during frequent transcontinental travels, since their performance is reduced and the adjustment of the biological clock requires some recommendations in the training process and behavioral approach. This review focuses on some current studies on endogenous and exogenous factors which affect the circadian rhythm in order to achieve better sport results, evaluation of the impact chronotype through chronometric tests and revising more valuable determinants of sport performance, as well as the application of new mathematical models in individual treatment of recovery of athletes in the phase of resynchronization.","PeriodicalId":22896,"journal":{"name":"The University Thought - Publication in Natural Sciences","volume":"7 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71153239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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