Browsing Articole ştiinţifice by Title

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  • Low noise 89 GHz detector module for MetOp-SG 
    HOEFLE, Matthias; COJOCARI, Oleg; SOBORNYTSKYY, Mykola; JANKOWSKI, Andrzej; OPREA, Ion; PENIRSCHKE, Andreas; JAKOBY, Rolf; DECOOPMAN, Thibaut; PERICHAUD, Marie-Genevieve; PIIRONEN, Petri (IEEE, 2015)
    Presented is an 89 GHz waveguide coupled direct detector based on low-barrier Schottky diodes. The design aims for signal-to-noise ratio (SNR) values above 35 dB within 6 dB input power dynamic, with significant white and ...
  • Low powered, tunable and ultra-light aerographite sensor for climate relevant gas monitoring 
    LUPAN, O.; POSTICA, V.; MECKLENBURG, M.; SCHULTE, K.; MISHRA, Y. K.; FIEDLER, B.; ADELUNG, R. (The Royal Society of Chemistry, 2016)
    Increasing atmospheric CO2 gas pollution and emergence of new types of green energy sources require continuous environmental monitoring. In this context, fast, efficient, light, robust, and reliable gas sensors that can ...
  • Low temperature preparation of Ag-doped ZnO nanowire arrays for sensor and light-emitting diode applications 
    LUPAN, O.; VIANA, B.; CRETU, V.; POSTICA, V.; ADELUNG, R.; PAUPORTÉ, T. (SPIE, Society of Photo-Optical Instrumentation Engineers, 2016)
    Transition metal doped-oxide semiconductor nanostructures are important to achieve enhanced and new properties for advanced applications. We describe the low temperature preparation of ZnO:Ag nanowire/nanorod (NW/NR) arrays ...
  • Low-Dimensional Organic Crystal Tetrathiotetracene–Iodide as Thermoelectric Material: Reality and Prospects 
    CASIAN, Anatolie; STOCKHOLM, John G.; DUSCIAC, Viorel; NICIC, Veaceslav (American Scientific Publishers, 2009)
    It is explained the strong dependence of electrical conductivity and very weak dependence of thermopower on crystal purity observed experimentally in ordinary quasi-one-dimensional organic crystals of tetrathiotetracene–iodide, ...
  • Low-Temperature Growth of ZnO Nanowire Arrays on p-Silicon (111) for Visible-Light-Emitting Diode Fabrication 
    LUPAN, O.; PAUPORTE, T.; VIANA, B. (American Chemical Society, 2010)
    We report on the successful growth of homogeneous and well-covering ZnO nanowire arrays at a low temperature (90 °C) directly on a p-type Si(111) wafer by an electrochemical method. The wires were self-standing and vertically ...
  • Low-temperature magnetic and thermal properties of CePd2In in magnetic fields 
    MOCK, S.; PIETRUS, T.; SIDORENKO, A.; VOLLMER, R.; LÖHNEYSEN, H. v. (Springer Nature Switzerland, 1996)
    A detailed study of the low-temperature magnetization M and specific heat C of CePd2In is reported. For B ≈ 0, M and C show maxima at TN≈ 1.25 K indicating an antiferromagnetic phase transition as observed previously. In ...
  • Low-Temperature Preparation of Ag-Doped ZnO Nanowire Arrays, DFT Study, and Application to Light-Emitting Diode 
    PAUPORTÉ, Thierry; LUPAN, Oleg; ZHANG, Jie; TUGSUZ, Tugba; CIOFINI, Ilaria; LABAT, Frédéric; VIANA, Bruno (American Chemical Society, 2015)
    Doping ZnO nanowires (NWs) by group IB elements is an important challenge for integrating nanostructures into functional devices with better and tuned performances. The growth of Ag-doped ZnO NWs by electrodeposition at ...
  • Low-temperature sintering of highly conductive ZnO:Ga:Cl ceramics by means of chemical vapor transport 
    COLIBABA, G. V.; RUSNAC, D.; FEDOROV, V.; PETRENKO, P.; MONAICO, E. V. (Elservier, 2021)
    A new technology for sintering a ZnO + Ga2O3 powder via chemical vapor transport based on HCl has been developed. The proposed sintering method has the following advantages: a low sintering temperature of 1000–1100 °C, ...
  • Low-Temperature Solution Synthesis of Au-Modified ZnO Nanowires for Highly Efficient Hydrogen Nanosensors 
    LUPAN, Oleg; POSTICA, Vasile; WOLFF, Niklas; SU, Jun; LABAT, Frédéric; CIOFINI, Ilaria; CAVERS, Heather; ADELUNG, Rainer; POLONSKYI, Oleksandr; FAUPEL, Franz; KIENLE, Lorenz; VIANA, Bruno; PAUPORTÉ, Thierry (American Chemical Society, 2019)
    In this research, the low-temperature single-step electrochemical deposition of arrayed ZnO nanowires (NWs) decorated by Au nanoparticles (NPs) with diameters ranging between 10 and 100 nm is successfully demonstrated for ...
  • Low-Voltage UV-Electroluminescence from ZnO-Nanowire Array/p-GaN Light-Emitting Diodes 
    LUPAN, Oleg; PAUPORTÉ, Thierry; VIANA, Bruno (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2010)
    UV LEDs : The fabrication of an ITO/ZnO-nanowires/p-GaN/In-Ga LED structure is reported with an active emitting layer made of high-quality epitaxial ZnO grown electrochemically from a solution at low temperature (85 °C). ...
  • Lucian Blaga „În marea trecere” 
    BRAGA, Mihail (Universitatea de Stat din Moldova, 2015)
    Lucian Blaga spune că el înmulţeşte tainele, minunele acestei lumi, pentru că el iubeşte această lume, pe când alţii cu mintea lor sugrumă viaţa, o nimicesc. Oare nu este vorba cumva de ştiinţa contemporană, care despică ...
  • Luminescence and electrophysical characteristics of ZnSe implanted with acceptor impurities 
    GEORGOBIANI, A. N.; AMINOV, U. A.; DRAVIN, V. A.; LEPNEV, L. S.; MULLABAEV, I. D.; URSAKI, V. V.; ILJUKHINA, Z. P. (ELSEVIER, 1999)
    The investigation of traps and recombination centres in structures based on ZnSe single crystals by means of the deep level transient spectroscopy, photoluminescence and electroluminescence methods are presented. The ...
  • Luminescence and Photoconductivity Caused by Antisite Defects in CdIn2S4 Single Crystals 
    GEORGOBIANI, A. N.; GRUZINTSEV, A. N.; RATSEEV, S. A.; TEZLEVAN, V. E.; TIGINYANU, I. M.; URSAKI, V. V. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 1986)
    Results of a study of the influence of nonstoichiometry as well as of annealing and argon ion implantation on photoluminescence and photoconductivity spectra of cadmium thioindate single crystals are presented. The energy ...
  • Luminescence at the axial centers of CdP2-D48 crystals 
    BERIL, S. I.; PANASENCO, V. V.; TKACHENKO, D. V.; STAMOV, I. G.; SYRBU, N. N. (Elservier, 2018)
    Emission lines of free excitons and excitons bound to axial centers have been observed in the luminescence spectra of CdP2-D48 crystals doped with Mn, Sn, and Sb at 10 K. Bands models of excitons bound to axial centers ...
  • Luminescence of GaN nanocolumns obtained by photon-assisted anodic etching 
    TIGINYANU, I. M.; URSAKI, V. V.; ZALAMAI, V. V.; LANGA, S.; HUBBARD, S.; PAVLIDIS, D.; FÖLL, H. (American Institute of Physics, 2003)
    GaN nanocolumns with transverse dimensions of about 50 nm were obtained by illumination-assisted anodic etching of epilayers grown by metalorganic chemical vapor deposition on sapphire substrates. The photoluminescence ...
  • Luminescence of porous semiconductor media covered with metallic films 
    POSTOLACHE, Vitalie (Academy of Sciences of Moldova, 2016)
    Porous GaP and InP layers with a pore diameter and a skeleton wall thickness of about 50 nm are prepared on bulk substrates by anodization; microgranular ZnO structures are produced by thermal treatment of ZnTe single ...
  • Luminescence of ZnGa2Î4 AND ZnAl2Î4 spinels doped with Eu3+AND Tb3+ ions 
    RUSU, E.; URSAKI, V.; NOVITSCHI, G.; BURLACU, A.; PETRENKO, P.; KULIUK, L. (I. I. Mechnikov National University, Odessa, 2008)
    Spinel type mono-phase the ZnGa2O4 and ZnAl2O4 compounds doped with Eu3+ and Tb3+ ions were obtained using two methods: solid phase reactions and deposition from chemical solutions. The luminescent analysis of the materials ...
  • Luminescence properties of a ZnO–In2O3 composite 
    URSAKI, V. V.; TIGINYANU, I. M.; BURLACU, A.; ZALAMAI, V.; JITARI, V. F. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2006)
    ZnO–In2O3 composite was prepared by thermal annealing of ZnIn2S4 crystals. Energy dispersive X-ray analysis demonstrated that annealing results in the formation of a composite consisting of ZnO and In2O3 phases with the ...
  • Luminescence properties of poly- (phenylene vinylene) derivatives 
    CUONG, Ton-That; GEOFF, Stockton; PHILLIPS, Matthew R.; NGUYEN, Thien-Phap; HUANG, Chun Hao; COJOCARU, Ala (John Wiley & Sons, Inc., 2008)
    Three PPV derivatives, BEHPPV, MEHPPV and MEHSPPV, were synthesised and characterised by photoluminescence (PL) and cathodoluminescence (CL) spectroscopies in the temperature range 10–300 K. PL and CL spectra of the polymers ...
  • Luminescence properties of ZnGa2O4 and ZnAl2O4 spinels doped with Eu3+ and Tb3+ ions 
    RUSU, E.; URSAKI, V.; NOVITSCHI, G.; VASILE, M.; PETRENCO, P.; KULYUK, L. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    Spinel-type ZnGa2O4 and ZnAl2O4 powders doped with Eu3+ and Tb3+ ions, including dual doping, have been prepared by solid phase reactions and by deposition from chemical solutions. XRD analysis demonstrates the high quality ...

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