Природно-математички факултет: Recent submissions
Now showing items 221-240 of 269
-
The influence of the modification of the montmorillonite KSF and K10 on the hydrolytic stability of UF composites
(2021-09-24)In this work, the hydrolytic stability of composites based on the urea-formaldehyde resin (UF) and montmorillonite-MMT (K1 0 and KSF) as a formaldehyde (FA) scavenger was investigated. K10 and KSF were activated by sodium ... -
The vulcanization properties of hybrid elastomeric materials based on waste rubber powder
(University of Belgrade, Technical Faculty in Bor, 2019-06-18)Elastomeric materials have viscoelastic properties and can be designed for numerous applications, tires production, vibration isolation and damping. These properties can be tailored for a wide temperature range and in ... -
NR/CSM/Wood flour polymer composites in railway industry
(Faculty of Mechanical Engineering Nis, 2018-10-11)Wood flour composites can be optimized to obtain new materials for a part of the railroad infrastructure. Curing, mechanical and morphological characteristics of carbon blackand silica-filled natural ntbber (NR)/chlorosulphonated ... -
Effect of silica on the properties of elastomeric materials based on NR/BR/SBR ternary rubber blend
(University in Banjaluka, Faculty of Technology, 2018-11-02)The effects of pyrogeneous silica on the mechanical properties of elastomeric materials based on natural rubber (NR), polybutadiene rubber (PB) and styrene-butadiene rubber (SBR) are reported. For sample preparations the ... -
Mathematical Approach for System Repair Rate Analysis Used in Maintenance Decision Making
(MDPI, 2021-05-20)Reliability, the number of spare parts and repair time have a great impact on system availability. In this paper, we observed a repairable system comprised of several components. The aim was to determine the repair rate ... -
MAXIMUM RELIABILITY K-CENTER LOCATION PROBLEM
(Union of Mathematicians of Macedonia - ARMAGANKA, 2020-10-31)This paper presents an approach for solving the maximum reliability k-center location problem. We are modifying the well-known p-center problem in order to determine the location of the observed objects and maximize the ... -
A stochastic model for estimation of repair rate for system operating under performance based logistics
(Polish Maintanace Society, 2018-09-01)Performance Based Logistics (PBL) concept has an aim to improve the system availability and it has been extensively researched in the recent years. These researches showed that inventory level does not impact system ... -
Neodrživost prakse urbanističkog planiranja u Srbiji – primer izmena i dopuna planova generalne regulacije.
(Asocijacija prostornih planera Srbije, Univerzitet u Beogradu – Geografski fakultet, 2018-04-10)Srbija nakon 2000. godine, urbzano prolazi kroz proces post-socijalističke transformacije. Ovaj proces prati transformacija socijalističke privrede, odlikovane snažnom regulatornom ulogom države, ka kapitalističkoj privredi, ... -
Pritisak na rečne obale i njihova transformacija usled izgradnje vikendica i sojenica: slučaj Savskog nasipa (Beograd).
(Asocijacija prostornih planera Srbije, Univerzitet u Beogradu- Geografski fakultet, 2020-11-10)Na prostorima neposredno uz reke, zbog hidroloških, ekoloških i bezbednosnih razloga, kao i zakonskih odredbi, načela i principa planiranja, najčešće nije dozvoljena gradnja. Planska dokumenta ove prostore uglavnom definišu ... -
Mathematical Modeling of Integral Characteristics of Repair Process under Maintenance Contracts
(MDPI, 2021-12-08)The repair rate is a very important parameter for system maintainability and can be defined as a frequency of successfully performed repair actions on a failed component per unit of time. This paper analyzes the integral ... -
Assessment of natural environment for the purposes of recreational tourism-example on Drina river flow (Serbia)
(European Association of Geographers (EUROGEO), 2019-09-10)The role of applied geography has been increasing in interdisciplinary research due to the advantage of knowing spatial processes and relations. This role has reflected in the geo-ecological evaluations of a particular ... -
A Novel Approach for Determination of Reliability of Covering a Node from K Nodes
(MDPI, 2020-09-05)In this paper, a stochastic problem of multicenter location on a graph was formulated through the modification of the existing p-center problem to determine the location of a given number of facilities, to maximize the ... -
Novel Composite Approximation for the Gaussian Q-Function
(Kaunas University of Technology, 2020-10-27)This paper, by using Borjesson’s and Benitez’s approximation of Q-function, presents a novel and improved composite approximation of Q-function with wide applicability. The presented approach is very general and can be ... -
System performances of sc reception in asymmetric multipath fading environments
(2019-06-23)The paper takes into consideration dual-branch selection combining (SC) diversity reception technique in the presence of dissimilar fading at their branches. We efficiently obtained first and second order closed form ... -
Comparison of adaptive algorithms for free space optical transmission in Malaga atmospheric turbulence channel with pointing errors
(2019)In this study, the authors investigate average capacity of free space optics communication over Málaga atmospheric turbulence channel with pointing errors and path loss, for intensity modulated/direct detection (IM/DD) and ... -
A Stochastic Model for Achieving Required Level of Availability Based on the Repair Rate Analysis
(Strojarski fakultet u Slavonskom Brodu; Fakultet elektrotehnike, računarstva i informacijskih tehnologija Osijek; Građevinski i arhitektonski fakultet Osijek, 2019-07-25)The aim of this paper is to set framework for the repair rate in order to achieve required availability of a repairable system with alternating renewal process where the failure rate is Weibull distributed. In order to ... -
Average Bit Error Rate Calculation Based on Using Piecewise Spline Approximation
In this paper, an approximation of the average bit error rate (ABER) probability expression, standard performance measure of wireless transmission over fading channels using linear spline functions with corresponding number ... -
Efficient Numerical Methods for Analysis of Square Ratio of kappa-mu and eta-mu Random Processes with Their Applications in Telecommunications
We will provide statistical analysis of the square ratio of and random processes and its application in the signal-to-interference ratio (SIR) based performance analysis of wireless transmission subjected to the influence ... -
Determinisanje promena u SRP “Gornje Podunavlje” (AP Vojvodina) primenom CORINE Land Cover (CLC) baze podataka (1990-2018)
(Asocijacija prostornih planera Srbije, Univerzitet u Beogradu – Geografski fakultet, Beograd., 2021-10-27)Specijalni rezervat prirode (SRP) „Gornje Podunavlje“ je lociran u severozapadnoj Bačkoj, uz panonski sektor toka Dunava. U radu su predstavljene promene na osnovu CORINE Land Cover (CLC) baze podataka (1990-2018) za ... -
Assessment of air temperature and precipitation trends: case study of Mačva (Serbia)
(University of Novi Sad, Faculty of Sciences, Department of Geography, Tourism and Hotel Management, Novi Sad, 2021-09-29)Recent climate change causes significant natural and socio-economic consequences. Global climate changes are caused by natural processes and anthropogenic factor. They represent one of the major environmental problems of ...