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Prikaz rezultata 183-202 od 269
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Power flow in multimode step-index plastic photonic crystal fibers
(Elsevier, 2021-08-21)We investigate the state of mode coupling in a multimode step-index plastic photonic crystal fiber (SI PPCF) with a solid-core by solving the time-independent power flow equation. For various arrangements of air-holes, ... -
Power flow in multimode W-type plastic optical fibers with graded index core distribution
(Elsevier, 2021-06-11)A method is proposed for investigation of transmission along a multimode W-type (doubly clad) plastic optical fiber (POF) with graded index (GI) distribution of the core. The multimode W-type GI POF is designed from a ... -
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 ... -
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 ... -
Procena zdravstvenog rizika izloženosti radonu iz vode u opštini Novo Brdo
Postojanje radona u vodi za pić e dovodi do unutrašnje izloženosti, direktno (kroz procese radioaktivnog raspadanja, ingestije i inhalacije) i indirektno (kada se kombinuju kao deo lanca ishrane). Merenje zastupljenosti ... -
Properties Of Elastomeric Composites Based On Three Network Precursors
(Wiley, 2019-04-10)The powder recycled rubber (PRR) can be used as a filler and a modifier for elastomeric materials and asphalt. Composites based on elastomers and recycled rubber powders are a serious challenge for the environment. The ... -
Quantification of organophosphorus pesticide azamethiphos using electroanalytical approach
In this work, for the first time, we proposed electrochemical behavior and development of analytical procedure for quantification of pesticide azamethiphos, using boron doped diamond (BDD) electrode. It was found that ... -
Quantization of Weights of Neural Networks with Negligible Decreasing of Prediction Accuracy
(Kaunas University of Technology, 2021-09-24)Quantization and compression of neural network parameters using the uniform scalar quantization is carried out in this paper. The attractiveness of the uniform scalar quantizer is reflected in a low complexity and relatively ... -
Radiation stability and thermal behaviour of modified UF resin using biorenewable raw material-furfuryl alcohol
(Elsevier, 2019-06-15)The thermal stability of organic-inorganic nano-composites prepared by a two-stage polymerization of urea-formaldehyde resin (UF) with furfuryl alcohol (FA) and TiO2 before and after irradiation has been researched. The ... -
Radionuclides and Metals in the Parks of the City of Belgrade, Serbia: Spatial Distribution and Health Risk Assessment.
In urban areas, forest patches and parks are usually the places where people spend most of their time outdoors. Due to the poor environmental protection policy and insufficient investment in industry and energy, Serbia is ... -
Radon anomalies as precursors of a recent earthquake: A case study of Kosovska Mitrovica environment
Spike-like peaks in the concentration of radon gas prior to a major earthquake are attributed to release different gases (CO2, CH4, H2S, SO2, H2 suitable for the transport of radon to the earth’s surface) due to pre-seismic ... -
Radon concentration in dwellings in the mining area of “Trepča” complex.
This paper presents the results of radon concentration in ground floor dwellings in the vicinity of the "Trepča" mine. Earlier studies on radon in the area of Kosovska Mitrovica have shown that there are dwellings with ... -
Radon levels and indoor air quality after application of thermal retrofit measures - a case study
This study was conducted toevaluate the influence of thermal retrofit on radon levels in workrooms,and to determine whetherthe radon concentrationin the building changes after the application of retrofit measures.In thefirst ... -
Raspodela ambijentalnog doznog ekvivalenta gama zračenja u ruralnim sredinama
(Društvo fizičara Srbije, Beograd, 2018-10-07)Prirodno pozadinsko zračenje koje se registuje u normalnim uslovima potiče od kosmičkog zračenjai prirodnih radionuklida, a zavisi od geologije tla i nadmorske visine mernog mesta, pa je karakteristično za neki prostor. ... -
Relationship between outdoor radon concentrations and meteorological parameters
In order to establish radon levels in outdoor atmosphere radon measurements were performed during the fifteen days by alpha spectrometric measuring method with detector Airthings Corentium Home. Measuring point was at 0.5 ... -
Research of UV radiation intensity in relation with outdoor measurement conditions
(2018-10-07)This paper oresents the results if measurements of ultraviolet radiation in Kuršumlija - Blace on July 15th 2018, and in Kruševac - Trstenik on July 16th 2018. -
Review and validation of photovoltaic solar simulation tools/software based on case study
(De Gruyter, 2022-05-10)Photovoltaic (PV) systems are an excellent solution to meet energy demand and protect the global environment in many cases. With the increasing utilization of the PV system worldwide, there is an increasing need for ... -
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 ... -
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. ... -
Savremene tehnologije i vizuelno-logički pristup u nastavi matematike
(2020-07-20)Poslednjih godina je uočljiva povećana primena informaciono-komunikacionih tehnologija i matematičkog softvera u nastavi matematike. Mnogobrojna istraživanja efikasnosti matematičkog učenja su pokazala opravdanost i korisnost ...