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Belgrade, Serbia

Jevtic S.D.,Railway Technical School | Sreckovic M.Z.,University of Belgrade | Pelemis S.S.,University of East Sarajevo | Konstantinovic L.M.,University of Belgrade | And 3 more authors.
Hemijska Industrija

In this paper a continuous (cw) lasers in visible region were applied in order to study the influence of quantum generator to certain plants. The aim of such projects is to analyze biostimulation processes of living organisms which are linked to defined laser power density thresholds (exposition doses). The results of irradiation of corn and wheat seeds using He-Ne laser in the cw regime of 632.8 nm, 50 mW are presented and compared to results for other laser types. The dry and wet plant seeds were irradiated in defined time intervals and the germination period plant was monitored by days. Morphological data (stalk thickness, height and cob length) for chosen plants were monitored. From the recorded data, for the whole vegetative period, we performed appropriate statistical data processing. One part of experiments contains the measurements of coefficient of reflection in visible range. Correlation estimations were calculated and discussed for our results. Main conclusion was that there was a significant increment in plant’s height and also a cob lenght elongation for corn. © 2015, Association of Chemists and Chemical Engineers of Serbia. All rights reserved. Source

Jevtic S.,Railway Technical School | Jevtic S.,University of Kragujevac | Sreckovic M.,University of Belgrade | Ostojic S.,University of Belgrade | And 2 more authors.
Optoelectronics and Advanced Materials, Rapid Communications

Multiple sensor systems and applications in ecology deserve multidisciplinary approach. Concerning laser implementation in monitoring, main parameters and processes have to be chosen in description of object of interest. The purpose of this paper is to underline the links and usability of scattering matrices in the description of biological objects (cells, nuclei, bacteria, etc). Light scattering processes are unavoidable in application and measurements, based on laser systems. Depending on the measurement systems, angular scattering and differential cross sections carry valuable information, and measurements should confirm chosen simplifications from theory. Shape recognition, size and chemical content could be certainly of interest in one part of ecological monitoring (water). Thermal imaging of objects depends on emissivity (water, ground, etc.) and some simplifications of derived cases are added to the previous. © 2015, National Institute of Optoelectronics. All rights reserved. Source

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