Природно-математички факултет: Recent submissions
Prikaz rezultata 241-260 od 269
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GIS analysis of land cover changes on the territory of the Prokuplje municipality
(Hindawi, 2014-01-03)The monitoring of the territory of Prokuplje Municipality was done based on 1 : 25,000 topographic maps in three different time periods (1969, 1974, and 1984) and land cover map in 2012. Analogous topographic maps done in ... -
Application of Mann-Kendal (MK) test in trend analysis of air temperature and precipitation: Case of Mačva district (Serbia)
(2020-06-30)Recent climate changes cause significant natural and socio-economic consequences. They represent one of the major environmental problems of the late 20th and early 21st centuries. Changes in temperature and precipitation ... -
Assessment of observed and projected climate changes in Bačka (Serbia) using trend analysis and climate modeling
(Hungarian Meteorological Service, 2022-03-08)Climate change is one of the largest environmental issues causing hydroclimatological extremes such as floods, droughts, and aridity. The aim of this study is to assess the observed and projected climate changes in Bačka ... -
On a quarter-symmetric generalized metric connection in a generalized Riemannian manifold
In this talk, we will discuss the generalized Riemannian manifold and introduce a quarter-symmetric connection that preserves the generalized Riemannian metric. We will also observe a quarter-symmetric connection with a ... -
VISUALIZATION OF GEOMETRIC OBJECTS USING PROGRAM PACKAGE MATHEMATICA
In geometry teaching, visualization is an indispensable method of work. Its importance is emphasized in the study of abstract theories when the human mind is not capable enough to perceive the regularities determined by ... -
Analiza efekata primene GEOGEBRA-e na praćenje nastave geometrije
Istraživanja su pokazala da uprkos brojnim prednostima primene savremenih tehnologija u nastavi matematike sam proces uvođenja istih u učionice je spor i dosta složen. Upravo iz tih razloga, ovaj rad istražuje mogućnosti ... -
CURVES ON RULED SURFACES UNDER INFINITESIMAL BENDING
(Faculty of Sciences and Mathematics, University of Priština in Kosovska Mitrovica, Republic of Serbia., 2021-01-01)Infinitesimal bending of curves lying with a given precision on ruled surfaces in 3-dimensional Euclidean space is studied. In particular, the bending of curves on the cylinder, the hyperbolic paraboloid and the helicoid ... -
Analysis of geodesics on different surfaces
It is widely known that some surfaces contain special curves as a geodesics, while a lots of geodesics on surface have complicated shapes. Goal of this research is to find on what surfaces are u- and v- parameter curves ... -
USE OF GEOGEBRA IN THE STUDY OF ROTATIONS
(Western Serbia Academy of Applied Studies, Užice (Serbia), 2021-10-08)With the development of information technologies and educational software, there was a need for research and examination of how and in what way to use them in teaching, without losing the quality of existing traditional ... -
Some new identities for the second covariant derivative of the curvature tensor
In this paper, we have studied the second covariant derivative of Riemannian curvature tensor. Some new identities for the second covariant derivative have been given. Namely, identities obtained by cyclic sum with respect ... -
Synthesis of Zinc Doped Phosphate Tungsten Bronzes and its Redox Activity in Aqueous Solution of LiNO3
Phosphate tungsten bronzes (WPB) have been intensively investigated for many applications due to their interesting chemical, optical, electrical, and mechanical properties. Their most known usages are as a pigment in ... -
PHYSICAL-CHEMICAL CHARACTERIZATION OF PHOSPHATETUNGSTEN BRONZE DOPED WITH IRON FROM HETEROPOLY SALTS AS PRECURSORS
Heteropolyacids, with a general formula ofH3+xAM12O40∙nH2O (x=0-1; A=P, Si, B, As, Ge;M=Mo, W; n=30-6) are of special interest as newmaterials because of their high conductivities. Among them special attention deserves ... -
PHYSICOCHEMICAL INVESTIGATION Zn DOPED PWB
Polyoxometalates (POMs), although having more than a hundred years of history, continue to attract the attention of researchers as catalysts, solid superionic proton conductors at room temperatures, applicable in different ... -
TOXIC METALS IN SOIL SAMPLES NEAR SOURCE OF POLLUTION WITH ECOLOGICAL RISK IN NORTHERN KOSOVO AND METOHIJA
The term toxic metals means heavy and light metals. Higher toxicity of heavy metals compared to light ones was stated, while many light metals belong to physiological and oligo-elements. The term heavy metals means metals ... -
The Role Of Analytical Chemistry Of Metal Ions In Monitoring The Quality Of The Environment
There is no doubt analytical laboratories have an essential role to play in environmental protection through monitoring of pollutants in air, water or soil. Research on trace elements and the effects of their ingestion ... -
Preparation and characterization of phosphatetungsten bronze doped with iron from heteropoly salts as precursors
Heteropolies of acids and salts heteropolises of acids can also be used as starting materials for the production of tungsten bronzes. These bronzes have a specific structure that results from the collapse of the Kegin anion ... -
Sadržaj i distribucija teških metala u reci Ibar tokom poplava i izlivanja jalovišta
This paper examines the impact of high flood magnitude on heavy metal pollution in the Ibar River, northern Kosovo and Metohija. The area of analysis is one of the most important industrial regions of Pb / Zn in Europe. ... -
Infinitesimal bending of DNA helices
(Scientific and Technical Research Council of Turkey - TUBITAK^(Turkiye Bilimsel ve Teknik Arastirma Kurumu), 2021-01-21)The mathematics of DNA molecules is often studied as a double helix model. This paper focuses on the modelling of infinitesimal bending of DNA helices. The paper checks the flexibility of DNA molecule, i.e. the flexibility ... -
Notes on product semi-symmetric connection in a locally decomposable Riemannian space
The purpose of this paper is to investigate the product semisymmetric connection in a locally decomposable Riemannian space. The curvature tensors of this connection were considered. Some properties of almost product ... -
Савремене методе масене спектрометрије у аналитици психоактивних супстанци у судској токсикологији
Mass spectrometry as an analytical technique has advanced extremely rapidly. New instruments with extraordinary characteristics have appeared on the market. Atmospheric ion sources have been developed, existing mass analyzers ...