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Now showing items 381-400 of 2187

Luminescent and optical spectroscopy of ZnO crystals obtained by new method based on the halide vapor transport

COLIBABA, G. V.; SHTEPLIUK, I. I.; GONCEARENCO, E. P.; INCULET, I. (Technical University of Moldova, 2015)

The photoluminescence (PL), transmittance and IR reflectance spectra were investigated for ZnO single crystals grown by the HCl chemical vapor transport technique. Electrical parameters were also calculated from the Hall ...
Multi sections semiconductor lasers with an air gap for chaos based communication

ANTOHI, I.; OLOINIC, T.; SANDUȚA, A.; RUSU, S. S.; TRONCIU, V. Z. (Technical University of Moldova, 2015)

This paper reports the numerical results of the dynamical behavior of a novel integrated semiconductor laser subject to multiple optical feedback loops. The laser’s setup consists of distributed feedback active section ...
Expected thermoelectric properties of nanostructured TTT(TCNQ)2 crystals

SANDULEAC, I. I. (Technical University of Moldova, 2015)

Advanced thermoelectric materials represent a keystone for development of new efficient devices for energy harvesting, local power generation from the waste heat and direct cooling systems. Thermal absorption of IR radiation, ...
Alternative technology for artificial stimulation of the motility of the gastrointestinal tract

POPA, V.; HOTINEANU, V.; SCORPAN, A.; CAZAC, A.; BRANISTE, T.; TIGINYANU, I. (Universitatea Tehnică a Moldovei, 2015)

In most of the situations the direct electrical stimulation via electrodes of the gastrointestinal tract is not acceptable. An alternative remote method was developed by implantation of high concentration of piezoelectric ...
Modeling of the structural transition in the nanostructured tetrathiotetracene-iodide crystal

ANDRONIC, Silvia (Technical University of Moldova, 2015)

The Peierls structural transition in quasi-one-dimensional (Q1D) organic crystals of tetrathiotetracene iodide (TTT2I3) is presented in the 1D and 2D physical model. For a more complete description of the crystal, two the ...
Radiative properties of GaSe and GaSe: Eu nanolamellar structures intercalated with Cd

UNTILA, D.; CARAMAN, M.; CANȚER, V.; EVTODIEV, Ig. (Technical University of Moldova, 2015)

In this work the crystalline structure, surface morphology, photoluminescence (PL) and absorption spectra of CdSe-GaSe and CdSe-GaSe<Eu> composites are studied in the fundamental absorption band edge region. The studied ...
Hybrid folded phonons in twisted graphene

NIKA, D. L.; COCEMASOV, A. I.; BALANDIN, A. A. (Technical University of Moldova, 2015)

We theoretically investigated phonon dispersion and specific heat in AA-stacked, AB-stacked and twisted bilayer graphene with various rotation angles. Twisting bilayer graphene leads to emergence of new phonon branches – ...
Luminescence and optical second harmonic generation in atomically thin layered transition metal dichalcogenides

KULYUK, Leonid (Technical University of Moldova, 2015)

This work concerns the photoluminescence (PL) properties of 2H-WS2, 2H-WSe2, 2H- and 3R-MoS2 bulk crystals and 2D flakes intercalated with halogen molecules, caused by direct gap emission with both neutral and charged ...
TiO2 nanotubular structures, synthesis and different applications

ENACHI, Mihai (Technical University of Moldova, 2015)

TiO2 nanotubular structures NTs are promising materials for gas sensing, optoelectronic and photonic applications. One of the key points in these applications is the possibility to control the morphology, dimensions of ...
Cavity quantum dynamics with pumped few-level emitters

CIORNEA, Viorel; BARDETSKI, Profirie; MACOVEI, Mihai A. (Technical University of Moldova, 2015)

Cavity quantum electrodynamics attracted a lot of attention due to possible applications in various areas. Here we demonstrate increased photon-photon correlations in a setup consisting of a moderately pumped two-level ...
Spintronics and optoelectronics - the light makes them closer

SIDORENKO, Anatolie (Technical University of Moldova, 2015)

Last decade very rapid development became a new direction of the microelectronics of 21st century – spintronics, or spin-dependent electronics. It is similar to the extremely rapid development of the optoelectronics in ...
Exciton–Polariton laser under the influence of the Landau quantization, Rashba spin-orbit coupling and Zeeman splitting

MOSKALENKO, S. A. (Technical University of Moldova, 2015)

The report consists from two parts. In the first of them I present a review of the investigations effectuated during last decades of the phenomenon of the Bose-Einstein Condensation (BEC) in the system of two-dimensional ...
Laser - magic tool for medical applications

CIOBANU, Nellu (Technical University of Moldova, 2015)

Recently, stimulated radiation produced by laser plays an important and increasing role in biology and medical applications. A laser is a device that emits a high intensity, narrow beam of light, usually of one single color ...
IR absorption by free carriers in nanostructured organic crystals of tetrathiotetracene-iodide

CASIAN, Anatolie (Technical University of Moldova, 2015)

The coefficient of long wave infra red (IR) absorption α is calculated for nanostructured organic crystals of tetrathiotetracene-iodide, TTT2I3, at room temperature as a function of radiation frequency v in the interval ...
The use of laser technology at the Alecu Russo State University of Balti

TOPALA, Pavel (Technical University of Moldova, 2015)

An excimer laser was conceived, designed and developed by the collaborators of laboratory of Laser Technologies from the Alecu Russo State University of Balti.
Discovery of the laser: Historical aspects

TIGINYANU, Ion (Technical University of Moldova, 2015)

The main steps undertaken by the mankind towards the discovery of the laser are reviewed, starting from the development of quantum theory of radiation by Albert Einstein in 1917, first demonstration of stimulated emission ...
2D materials nanotechnologies between great expectations and lost illusions

DRAGOMAN, Mircea (Technical University of Moldova, 2015)

This talk will be a review of the state of the art of 2D materials starting with graphene. The graphene discovery and latter of other 2D materials have produced a revolution in nanotechnology. New physical phenomena were ...
New take-off of Gallium Nitride

TIGINYANU, Ion (Technical University of Moldova, 2015)

Gallium Nitride (GaN) is a wide-band-gap semiconductor compound (Eg = 3.4 eV at 300 K) which over the last decades played a major role in the development of modern solid-state lighting industry. An intensive investigation ...
Theory of Catalytic Micro- and Nanoengines: From Self-Propulsion Mechanisms to Remediation of Polluted Water

FOMIN, V. (Technical University of Moldova, 2015)

A review is given of the theoretical ideas concerning the propulsion mechanisms of the catalytic micro- and nanoengines, which are prospective in robotics, biomedical engineering and environmental sustainability. Enhanced ...
Bioinspired Optical Materials

ZOLLFRANK, Cordt (Universitatea Tehnică a Moldovei, 2015)

Natural systems are able to produce materials with unique properties. The formation of complex three-dimensional structures in nature is of fundamental importance to break the limits imposed by available construction ...

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