IRTUM – Institutional Repository of the Technical University of Moldova

Browsing Articole din publicaţii internaţionale by Title

Browsing Articole din publicaţii internaţionale by Title

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  • Ultra-lightweight pressure sensor based on graphene aerogel decorated with piezoelectric nanocrystalline films 
    DRAGOMAN, Mircea; GHIMPU, Lidia; OBREJA, Cosmin; DINESCU, Adrian; PLESCO, Irina; DRAGOMAN, Daniela; BRANISTE, Tudor; TIGINYANU, Ion (IOP Publishing, 2016)
    In this paper, we report on a pressure sensor based on graphene aerogel functionalized with SnO2 or GaN thin films deposited by magnetron sputtering. Decoration by nanocrystalline SnO2 or GaN was found to enhance the ...
  • Ultra-sensitive and selective hydrogen nanosensor with fast response at room temperature based on a single Pd/ZnO nanowire 
    LUPAN, Oleg; POSTICA, Vasile; LABAT, Frédéric; CIOFINI, Ilaria; PAUPORTÉ, Thierry; ADELUNG, Rainer (ELSEVIER, 2018)
    In this work the gas sensing properties of nanosensors fabricated by a “bottom-up” approach in a FIB/SEM system based on a single Pd modified ZnO nanowire is investigated in detail. Synthesis, surface doping and functionalization ...
  • Ultra-Thin GaN Membranes Fabricated by Using Surface Charge Lithography 
    TIGINYANU, Ion; POPA, Veaceslav; STEVENS-KALCEFF, Marion A. (The Electrochemical Society, 2019)
    We report on fabrication of ultra-thin GaN membranes of nanometer scale thickness, by using the concept of surface charge lithography based on low-energy ion treatment of the sample surface with subsequent photoelectrochemical ...
  • Ultra-thin semiconductor membrane nanotechnology based on surface charge lithography 
    TIGINYANU, Ion; POPA, Veaceslav; STEVENS-KALCEFF, Marion A. (Society of Photo-Optical Instrumentation Engineers, SPIE, 2011)
    We show that by subjecting GaN epilayers on sapphire substrates to low-energy/low-dose ion treatment with subsequent photoelectrochemical etching it is possible to fabricate ultra-thin GaN membranes in the form of nano-roof ...
  • Ultra-thin TiO2 films by atomic layer deposition and surface functionalization with au nanodots for sensing applications 
    LUPAN, Oleg; POSTICA, Vasile; ABABII, Nicolai; REIMER, Tim; SHREE, Sindu; HOPPE, Mathias; POLONSKYI, Oleksandr; SONTEA, Victor; CHEMNITZ, Steffen; FAUPEL, Franz; ADELUNG, Rainer (ELSEVIER, 2018)
    The presented study demonstrates the importance of the film thickness and surface functionalization with noble metals nanoclusters for sensing applications of ultra-thin TiO2 layers. Such ultra-thin films could be used for ...
  • Ultrafast third-order optical nonlinearity in SnS2 layered compound for photonic applications 
    PETRIS, Adrian; GHEORGHE, Petronela S.; VLAD, Valentin I.; RUSU, Emil; URSAKI, Veaceslav V.; TIGINYANU, Ion M. (ELSEVIER, 2018)
    The ultrafast nonlinear optical response of SnS2 layered compound, excited by high-repetition-rate ultrashort (fs) pulses at 1550 nm wavelength, is investigated for the first time by optical third harmonic generation. In ...
  • Ultrashort Electromagnetic Modes in the Low Frequency Region of the Spectrum in a Nanocylinder Array 
    SIRBU, L.; SERGENTU, V.; MULLER, R.; URSAKI, V.; TIGINYANU, I. M. (Springer Nature Switzerland, 2014)
    In this work we present the theoretical model of existence of ultrashort modes in low frequency region of the electromagnetic spectrum in a system of nanocilinders array. These modes have no analogue in a spectrum with ...
  • Ultraviolet photoconductive sensor based on single ZnO nanowire 
    LUPAN, O.; CHAI, G.; CHOW, L.; EMELCHENKO, G. A.; HEINRICH, H.; URSAKI, V. V.; GRUZINTSEV, A. N.; TIGINYANU, I. M.; REDKIN, A. N. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2010)
    ZnO nanowires were synthesized by the CVD procedure and have been investigated by SEM, TEM, SAED, Raman, and cw PL spectroscopy. The fabrication of an ultraviolet (UV) photoconductive detector based on single ZnO nanowire ...
  • Un indice quasi invariant de apreciere a disproporţionalităţii în sisteme RP 
    BOLUN, Ion; CEBOTARI, Sergiu (Academia de Studii Economice din Moldova, 2012)
    Pentru sistemele de votare cu reprezentare proporţională, este definită noţiunea de indice invariant. În scopul folosirii în cercetări comparative a unor asemenea sisteme, suplimentar la indicii Rae şi Grofman, care sunt ...
  • Uncertainty modelling of dynamically reconfigurable systems based on rewriting stochastic reward nets with z-fuzzy parameters 
    MORARU, Victor; GUŢULEAC, Emilian; ZAPOROJAN, Sergiu (Institute of Mathematics and Computer Science of the Academy of Sciences of Moldova, 2021)
    This paper presents the descriptive compositional approach for uncertainty modelling and performance evaluation of dynamic reconfigurable discrete event systems (ReDES) using rewriting stochastic reward nets (ReSRN) with ...
  • Understanding circular economy and sustainable development awareness 
    DIACONU, Cristina; BUGAIAN, Larisa (Харківський національний технічний університет сільського господарства імені Петра Василенка, 2021)
    The basic objective of this scientific approach is focused on shaping the theoretical and conceptual framework on the circular economy and highlighting the importance of awareness of each of us of the need to implement ...
  • Understanding Distributed Program Behavior Using a Multicast Communication Scheme 
    MOCANU, Mihai; GUŢULEAC, Emilian (Springer Nature Switzerland, 2008)
    Events in a distributed global computation framework, unlike those in a sequential local computation, form a partially ordered set with respect to the causality relation revealed by timestamps. This paper describes a new ...
  • Understanding the barrier properties of dry, clay-based coatings. A contribution from computational modelling 
    SIMINEL, Nikita; BREEN, Chris; CLEAVER, Doug; CLEGG, Francis (The James Hutton Institute, 2015)
    Coatings with high barriers to gases, vapours and flavours find their major application in food packaging materials. Taking into account the amount of food currently wasted every year, packaging that keeps it fresh for a ...
  • Unforseen factors influencing Fe(III)-containing cations sorption on strongly basic anion exchangers 
    GUTSANU, Vasile; SCHITCO, Cristina; DRUTSA, Raisa (John Wiley & Sons, Inc., 2008)
    The sorption and partial destruction of the Fe(III)-containing compounds in the aqueous medium in strongly basic anion exchangers AV-17 and Varion-AD phase have been investigated. It is shown that partial destruction of ...
  • Uniform and Nonuniform Nucleation of Pores during the Anodization of Si, Ge, and III-V Semiconductors 
    LANGA, S.; CARSTENSEN, J.; CHRISTOPHERSEN, M.; STEEN, K.; FREY, S.; TIGINYANU, I. M.; FÖLL, H. (The Electrochemical Society, Inc., 2005)
    Morphology is one of the basic characteristics of porous layers. For electrochemically grown pores, morphology is strongly dependent on the starting phase of pore growth, the so-called nucleation phase. This paper addresses ...
  • Unripe apples – source of natural organic acids 
    CRUCIRESCU, Diana (Galati University Press, 2021)
    Research has focused on determining titratable acidity in unripe apples of 4 varieties: Coredana, Golden Rezistent, Rewena and Reglindis. Other physicochemical indices were also determined. These were picked between June ...
  • Up-conversion luminescence in GaSe nanocrystals 
    SYRBU, N. N.; STAMOV, I. G.; DOROGAN, A. V.; ZALAMAI, V. V. (Elservier, 2021)
    Optical properties of GaSe crystals have been investigated at wide temperature range from 10 to 300 K by help of reflection, absorption, and wavelength modulated reflection, and transmission spectra. Received data were ...
  • Up-conversion luminescence in samarium doped ZnAl2Se4 single crystals 
    ZALAMAI, V. V.; SYRBU, N. N.; RUSU, E. V.; TIRON, A.; BEJAN, N. P. (IOP Publishing, 2018)
    Photoluminescence spectra of ZnAl2Se4:Sm2+ due to the processes of charge carriers recombination from levels 5Dj, 5Lj, 5Gj and 5Hj (4f55d1) on levels 7Fj of samarium ions were investigated. The broad photoluminescence band ...
  • Upper critical field of periodic and fractal Nb/Cu multilayers 
    SIDORENKO, A.; SÜRGERS, C.; TRAPPMANN, T.; WOSNITZA, J.; LÖHNEYSEN, H. v. (Springer Nature Switzerland, 1996)
    Measurements of the upper critical fieldBc2of superconducting Nb/Cu multilayers with fractal and periodic stacking sequence are reported. A positive curvature of the perpendicular magnetic field Bc2⊥, i.e. an upward deviation ...
  • Urbach's tail in the absorption spectra of CuIn5Se8 and CuGa3Se5 single crystals 
    ARUSHANOV, E.; LEVCENKO, S.; SYRBU, N. N.; NATEPROV, A.; TEZLEVAN, V.; MERINO, J. M.; LEÓN, M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2006)
    Optical absorption spectra of CuIn5Se8 and CuGa3Se5 single crystals grown by chemical vapour transport were investigated in the range of 10–300 K. The logarithmic variation of the absorption coefficient with photon energy ...

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