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Spatio-temporal variabilty of air temperatures in Central Serbia from 1949 to 2018
(2021-06-20)
The paper presents trends for three categories of variables: average annual, average maximum and average minimum air temperatures. Data was provided by the meteorological yearbooks of the Republic Hydrometeorological Service ...
GIS and geographical analysis of the main harbors in the world
(2021-05-28)
This paper points out the possibilities of better exploitation of marine traffic as well as its connection with other kinds of traffic. Special attention is given to the analysis of 1,081 harbors about their availability ...
Assessment of soil erosion rates using Revised Universal Soil Loss Equation (RUSLE) and GIS in Bačka (Serbia)
(2021-10-01)
Soil erosion assessment enables the identification of manifested soil erosion categories, their spatial distribution and the relationship between soil erosion and land use patterns. The integrated approach of the RUSLE ...
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 ...
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 ...
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 ...
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 ...
Nano-silica-based urea-formaldehide composite with some derivates of coumarin as formaldehyde scavenger: hydrolitycal and thermal stability
(Springer Nature, 2021-01-25)
The hydrolytic stability of two nano-SiO2-based UF composites with derivates of coumarin (names as K-1 and K-2) was investigated. K-1 is 3-nitro-4-(p-tolylamino)-2H-chromen-2-one and K-2: 4-((3-nitro-2-oxo-2H-chromen-4-y ...
Influence of width of launch beam distribution and mode coupling on transmission characteristics of W-type plastic optical fibers
(IOP Science, 2021-07-16)
We show strong effects of width of the launch beam’s angular distribution on bandwidth and
mode coupling in W-type plastic optical fibers (POFs). In general, the broader this width, the
stronger the coupling and the lower ...
Influence of the Wavelength on the Bandwidth in W-Type Plastic Optical Fibers
(Springer Link, 2021-07-03)
We investigate the bandwidth and steady-state losses of multimode W-type plastic optical fibers solving the time-dependent power flow equation and show how the bandwidth in W-type plastic optical
fibers can be enhanced ...