Articole ştiinţifice: Recent submissions

Now showing items 861-880 of 4710

Kinetic characteristics of SnO2 thin-film gas sensors for environmental monitoring

KOROTCHENKOV, Ghennadii S.; BRYNZARI, Vladimir I.; DMITRIEV, Sergei V. (SPIE, 1998)

In this report we presented results of gas sensitivity' kinetics analysis for undoped SnO2 thin films, deposited by spray pyrolysis method, using SnCl4x5H2O alcohol solution. The comparison of gas sensitivity's kinetics ...
Medium-power stabilized laser diode

SMEU, Emil; PUSCAS, Niculae N.; POPESCU, Ion M.; SURUCEANU, Grigore I.; ISPASOIU, Radu G. (SPIE, 1998)

Power stabilized DL's represent today convenient sources for radiometric applications, as transfer laboratory standards. Stability measurements were carried out and reported by other authors for different time intervals, ...
Enhanced internal second harmonic generation in InGaAs/GaAs/AlGaAs strained single-quantum-well buried-heterostructure laser diodes

ISPASOIU, Radu G.; PUSCAS, Niculae N.; SMEU, Emil; BOTEZ, C. E.; IACOVLEV, Vladimir P.; MEREUTZA, Alexandru Z.; SURUCEANU, Grigore I. (SPIE, 1998)

In this paper we report an indirect method based on photomultiplier response calibration to measure the radiant power of the internal second harmonic generation (ISHG) from InGaAs/GaAs/AlGaAs strained single quantum well ...
Analysis of phase-matching conditions for internal second-harmonic generation in InGaAs quantum well laser diodes

FRUNZA, M.; SMEU, Emil; PUSCAS, Niculae N.; POPESCU, Ion M.; SURUCEANU, Grigore I. (SPIE, 2001)

In this paper we present an analysis of the phase-matching conditions for internal second-harmonic generation in InGaAs quantum-well laser diodes in order to enhance the conversion efficiency. We have characterized the ...
UV radiation sensors with unitary and binary superficial barrier

DOROGAN, Valerian; VIERU, Tatiana; KOSYAK, V.; DAMASKIN, I.; CHIRITA, F. (SPIE, 1998)

UV radiation sensors with unitary and binary superficial barrier, made on the basis of GaP - SnO2 and GaAs - AlGaAs - SnO2 heterostructures, are presented in the paper. Technological and constructive factors, which permit ...
Optimization of thin-film gas sensors for environmental monitoring through theoretical modeling

BRYNZARI, Vladimir I.; KOROTCHENKOV, Ghennadii S.; SCHWANK, Johannes W. (SPIE, 1999)

The task of optimization of gas sensor characteristics such as absolute value and temperature range of sensitivity, time response and selectivity is one of the most important problems of gas sensor design. Unfortunately, ...
Quadrant detector based on InGaAsP heterostructures

DOROGAN, Valerian; BRYNZARI, Vladimir I.; VIERU, Tatiana; KOSYAK, V. (SPIE, 1998)

A new device called selective quadrant-detector, realized on the basis of InGaAsP heterostructures, is presented in the paper. It consists of a circular photodiode-quadrant with protective peripheric ring, having selective ...
Multilayer porous structures on GaN for the fabrication of Bragg reflectors

BRANISTE, Tudor; MONAICO, Eduard; MARTIN, Denis; CARLIN, Jean-François; POPA, Veaceslav; URSAKI, Veaceslav V.; GRANDJEAN, Nicolas; TIGINYANU, Ion M. (SPIE, 2017)

We report on the development of electrochemical etching technology for the production of multilayer porous structures (MPS) allowing one to fabricate Bragg reflectors on the basis of GaN bulk substrates grown by Hydride ...
Blue-red electroluminescence from hybrid Eu:phosphors/ZnO-nanowires/p-GaN LED

VIANA, B.; PAUPORTE, T.; LUPAN, O.; DEVIS, L.; GACOIN, T. (SPIE, 2021)

Nanowire (NW) based light emitting diodes (LEDs) have drawn great research interest due to many advantages compared to thin film based devices. Marked improved performances are expected from nanostructured active layers ...
Optical-electronic multiprocessors computer systems controlled by input images parameters

PERJU, Veacheslav L.; CASASENT, David P. (SPIE, 2005)

We present a new class of optical-electronic reconfigurable image processing systems, controlled by the parameters of the input image. The systems use multiprocessors and are distributed. We describe two different optical ...
The intellectual processor on basis of 2nd order objects in restoration of images

MARDARE, Igor; PERJU, Veacheslav L.; CASASENT, David P. (SPIE, 2007)

This paper deals with the problem of intellectual restoration of images. It is suggested to represent various objects and stages as objects of the first and second orders. Representation of dominant object as second order ...
Nanofabrication and diffractive and microrefractive optics element applications in compact sensor systems

CONSTANTINOV, Boris I. (SPIE, 2021)

The development of dynamical surface of viscous liquid with electrical charge is researched in the periodical restoring process of spatial deformation type crater. The possibility of obtaining of optical elements on PTPC ...
Responsivity and detectivity of Zn0.8Mg0.2O/p-Si prepared by spin coating and aerosol deposition method

MORARI, V.; RUSU, E.; URSAKI, V.; TIGINYANU, I. M. (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu", 2021)

In this paper, we present data concerning responsivity and detectivity of Zn0.8Mg0.2O/p-Si photodetectors based on thin films prepared by spin-coating and aerosol deposition methods from 0.35 M aqueous solution using Zn ...
Topological features of quantum magnetotransport in Bi1-xSbx (0 ≤ x ≤ 0.2) bicrystals

MUNTYANU, Fiodor; CHISTOL, Vitalie; CONDREA, Elena; SIDORENKO, Anatolie (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu", 2021)

Unusual topological features related to the interface Dirac electrons have been revealed: the longitudinal Hall quasi-plateaus, along with minima in magnetoresistance; the manifestation of Umkehr effect, non- allowed by ...
Imaginea instituției medicale publice – factor obiectiv fundamental al sistemului de sănătate din Republica Moldova

LUPAȘCU, Zinaida (Universitatea de Stat de Medicină şi Farmacie "Nicolae Testemiţanu", 2021)

A new direction in management sociology is the administration of the image of medical institutions. When the key component in the form of an image is introduced in the activity of a healthcare institution, it’s social ties ...
Perspectivele multidisciplinare de cercetare a fenomenului de conștiință

LOZOVANU, Ecaterina (Universitatea de Stat de Medicină şi Farmacie "Nicolae Testemiţanu", 2021)

Conștiința este adevărul fundamental al existenței umane, este ceea ce dă sens vieții, dar și cel mai misterios fenomen din univers. Conștiința este un fenomen complicat nu numai din perspectivă structurală, dar și ...
High-Performance Gas Sensors Using Heterostructures based on Binary and Ternary Metal Oxides

ABABII, Nicolai; BODDULURI, Mani Teja; KRÜGER, Helge; HANSEN, Sandra; POSTICA, Vasile; LUPAN, Oleg; ADELUNG, Rainer (IEEE, 2021)

The gas sensing properties of heterojunctions based on binary and ternary metal oxides (CuAl 2 O 4 /Al 2 O 3 /CuO/Cu 2 O, ZnAl 2 O 4 /ZnO and Zn 2 SnO 4 ) were investigated in detail and demonstrated excellent sensitivity ...
Prospects for the use of agricultural waste as a substrate for acetic fermentation

BOISTEAN, Alina; CHIRSANOVA, Aurica; STURZA, Rodica (Galati University Press, 2021)

In this work, we investigated the possibility of using agro waste, such as grape pomace, walnut and hazelnut shells, apple woods chips, as a substrate for plantations and the development of acetic acid bacteria.
Plant extracts as inhibitors of foodborne pathogenic bacteria

COJOCAR, Daniela (Galati University Press, 2021)

It has been demonstrated that the lowest inhibitory and bactericidal concentration on S. aureus is found in white sea buckthorn powders, followed by rosehip groats and grape marc. In the case of E. coli and K. pneumoniae, ...
Antimicrobial activity of sea buckthorn and chokeberry powders on pathogenic bacteria

STURZA, Rodica; BALAN, Greta; COJOCARI, Daniela; PINTEA, Adela; SOCACIU, Carmen; GHENDOV-MOSANU, Aliona (Galati University Press, 2021)

In order to reduce the degree of food microbial contamination, antimicrobial activity, minimum inhibitory concentrations (MIC) and minimum bactericidal concentrations (MBC) of sea buckthorn (Hippophae rhamnoides L.) and ...

Now showing items 861-880 of 4710

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