https://repository.utm.md/handle/5014/4605 2026-04-12T13:21:54Z 2026-04-12T13:21:54Z CULEAC, I. NISTOR, I. IOVU, M. BUZDUGAN, A. CIORNEA, V. COJOCARU, I. https://repository.utm.md/handle/5014/16738 2021-08-17T09:57:13Z 2013-01-01T00:00:00Z

Fiber Optic Intrusion Monitoring System CULEAC, I.; NISTOR, I.; IOVU, M.; BUZDUGAN, A.; CIORNEA, V.; COJOCARU, I. The fiber optic intrusion monitoring system comprises a multimode optical fiber connected to a coherent light source, a CCD detector and a processor for generation of the output signal. The system is based on the principle of variation of speckle pattern in the far-field of a multimode optical fiber under the action of mechanical perturbation. By processing the speckle pattern one can derive information on the amplitude of perturbation. The algorithm for processing of the speckle pattern is based on comparison of the current speckle image with the reference image. Each of the current images is subtracted pixel-by-pixel from the reference image. The output signal is obtained by summation of absolute values of all pixels differences. Intrusion monitoring system can find application in surveillance of perimeters, and industrial objects, deposits of chemicals and radioactive waste, etc.

2013-01-01T00:00:00Z DRAGOMAN, Mircea CISMARU, Alina RADOI, Antonio DRAGOMAN, Daniela https://repository.utm.md/handle/5014/8314 2020-05-21T11:57:06Z 2013-01-01T00:00:00Z

DNA Hybridization Detection Using Microwave Resonators DRAGOMAN, Mircea; CISMARU, Alina; RADOI, Antonio; DRAGOMAN, Daniela The unhybridized and hybridized states of the DNA ( ss DNA and ds DNA) are detected using a miniaturized electromagnetic band gap microwave resonator. The two DNA states are detected unambiguously using a maximum frequency span 2.6 GHz. The transmission measurements were repeated on various resonators positioned on the same wafer and the results were reproduced with high accuracy. The span of 1 GHz between DNA two states was measured in the case when ss DNA was anchored directly on the surface of the electromagnetic bandgap microwave resonator with the frequency GHz, while a span of 2.6 GHz was measured when DNA is anchored to gold nanoislands decorating bamboo-shaped carbon nanotubes and 0.5 μL of this solution is uniformly deposited on the surface of the electromagnetic bandgap microwave resonator with the frequency GHz. The big difference between the two states of DNA is due their different effective electrical permittivity in the microwave range.

2013-01-01T00:00:00Z HAREA, D. V. HAREA, E. E. COLOMEICO, E. P. IOVU, M. S. https://repository.utm.md/handle/5014/8313 2020-05-21T11:53:15Z 2013-01-01T00:00:00Z

Photoplastic and photoinduced effects in amorphous As2Se3:Snx thin films HAREA, D. V.; HAREA, E. E.; COLOMEICO, E. P.; IOVU, M. S. The mechanical characteristics of amorphous As2Se3:Sn prepared by thermal evaporation in vacuum on glass substrates heated at Tsubstr = 100 oC are investigated. It was established that the hardness H of amorphous thin films is generally higher than the hardness of bulk samples of the same chemical composition. Because the composition of chalcogenide glass (ChG) determine the kind of structural units and the mean coordination number, in the present work the amorphous films of the As2Se3:Snx (x=0÷10.0 at.% Sn) of chalcogenide system were investigated. The combination of depth sensing indentation and band-gap illuminations has been used to study the photoplastic effect in chalcogenide glasses. The prominent photoplastisity of thin films has been revealed through hardness deviations during nanoindentations under light illuminations from those ones which have been observed for the materials on the darkness. Some optical properties and the modification of optical parameters (optical band gap Eg, absorption coefficient α, refractive index n) under light irradiation and heat treatment of the amorphous As2Se3:Snx thin films thin films, and the relaxation of photodarkening effect under the light exposure also was investigated.

2013-01-01T00:00:00Z USHENKO, V.O. KOVAL, G.D. DUBOLAZOV, A.V. KARACHEVTSEV, A. O. OLAR, O. I. BOYCHUK, T. M. https://repository.utm.md/handle/5014/5466 2020-04-23T13:07:30Z 2013-01-01T00:00:00Z

Evolution of Mueller Matrix Images of the Myometrium for the Optical Anisotropy Oncological Changes USHENKO, V.O.; KOVAL, G.D.; DUBOLAZOV, A.V.; KARACHEVTSEV, A. O.; OLAR, O. I.; BOYCHUK, T. M. The optical model of polycrystalline networks of myometium is suggested. The results of investigating the interrelation between the values correlation (correlation area, asymmetry coefficient and autocorrelation function excess) and fractal (dispersion of logarithmic dependencies of power spectra) parameters are presented. They characterize the distributions of Mueller matrix elements in the points of laser images of myometrium histological sections. The criteria of differentiation of death coming reasons are determined.

2013-01-01T00:00:00Z