Articole din publicaţii internaţionale: Recent submissions

  • The role of stress management in the relationship manager-subordinate 
    LUNGU, Viorelia ("Print-Caro" SRL, 2019)
    Although there are numerous investigations related to occupational stress, in the educational field, a particular approach to this phenomenon is necessary, because in the pedagogical activity, there are permanent communication ...
  • Применение ростовых веществ в инкрустации семян кукурузы 
    БОРОВСКАЯ, Ала; МАЩЕНКО, Наталия; ГУРЕВ, Анжела; ИВАНОВА, Раиса (Institutul de Fitotehnie „Porumbeni“, 2018)
    The possibilities of application the complex of the sodium salt of carboxymethylcellulose (CMC) the drug "ecostim" allowed for use in the territory of the Republic of Moldova, for encrusting of corn seeds have been studied. ...
  • Design and maskless fabrication of ultrathin suspended membranes of GaN 
    TIGINYANU, I. M.; POPA, V.; STEVENS-KALCEFF, M. A.; GERTHSEN, D.; BRENNER, P.; PAVLIDIS, D. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2012)
    We report the maskless fabrication of ultrathin suspended GaN membranes designed by focused ion beam treatment of the GaN epilayer surface with subsequent photoelectrochemical etching. This technological approach allows ...
  • Thermally activated cation ordering in ZnGa2Se4single crystals studied by Raman scattering, optical absorption, andab initiocalculations 
    VILAPLANA, R.; GOMIS, O.; PEREZ-GONZÁLEZ, E.; ORTIZ, H. M.; MANJÓN, F. J.; RODRIGUEZ-HERNANDEZ, P.; MUŇOZ, A.; ALONSO-GUTIÉRREZ, P.; SANJUÁN, M. L.; URSAKI, V. V.; TIGINYANU, I. M. (IOP Publishing, 2013)
    Order–disorder phase transitions induced by thermal annealing have been studied in the ordered-vacancy compound ZnGa2Se4 by means of Raman scattering and optical absorption measurements. The partially disordered as-grown ...
  • Poly(p-phenylene vinylene)/porous GaP composite materials 
    LE RENDU, P.; NGUYEN, T. P.; LAKEHAL, M.; IP, J.; TIGINYANU, I. M.; SARUA, A.; IRMER, G. (ELSEVIER, 2001)
    We report results obtained from physical characterization of thin composite films made by mixing poly(p-phenylene vinylene) (PPV) and porous gallium phosphide (GaP) particles with different GaP concentrations. Optical ...
  • Spatially resolved cathodoluminescence of GaN nanostructures fabricated by photoelectrochemical etching 
    DÍAZ-GUERRA, C.; PIQUERAS, J.; POPA, V.; COJOCARU, A.; TIGINYANU, I. M. (American Institute of Physics, 2005)
    The emission properties of GaN nanostructures created by photoelectrochemical etching have been investigated by cathodoluminescence sCLd in the scanning electron microscope. Columnar structures with diameters of 150–250 ...
  • Strongly frequency dependent focusing efficiency of a concave lens based on two-dimensional photonic crystals 
    FOCA, E.; FÖLL, H.; CARSTENSEN, J.; SERGENTU, V. V.; TIGINYANU, I. M.; DASCHNER, F.; KNÖCHEL, R. (American Institute of Physics, 2006)
    Results of an experimental study of a concave lens based on a two-dimensional microwave photonic crystal with neff<1 are shown. We demonstrate that the lens focuses electromagnetic radiation for transverse electric (TE) ...
  • A GaN-based two-sensor array for methane detection in an ethanol environment 
    POPA, V.; TIGINYANU, I. M.; URSAKI, V. V.; VOLCIUS, O.; MORKOÇ, H. (IOP Publishing, 2006)
    We demonstrate that photoelectrochemical (PEC) etching of GaN layers in KOH or H3PO4 solutions leads to the formation of specific surface morphologies which cause the material to exhibit different sensitivities to certain ...
  • ZnSe-based conductive nanotemplates for nanofabrication 
    MONAICO, Eduard; TIGHINEANU, Petru; LANGA, Sergiu; HARTNAGEL, Hans L.; TIGINYANU, Ion (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    We show that anodic etching of n-type ZnSe crystalline substrates leads to the formation of pores which, after nucleation at surface defects, prove to follow the current lines, exhibiting multiplication until the front of ...
  • Cathodoluminescence of TiO2 nanotubes prepared by low-temperature anodization of Ti foils 
    ENACHI, Mihai; STEVENS-KALCEFF, Marion; TIGINYANU, Ion; URSAKI, Veaceslav (ELSEVIER, 2010)
    We show that anodization of Ti sheets in an ethylene glycol and HF containing electrolyte at temperatures under 0°C results in the formation of a self-arranged ordered porous structure at the top surface of the sample. ...
  • Vibrational study of HgGa2S4 under high pressure 
    VILAPLANA, R.; ROBLEDILLO, M.; GOMIS, O.; SANS, J. A.; MANJÓN, F. J.; PÉREZ-GONZÁLEZ, E.; RODRÍGUEZ-HERNÁNDEZ, P.; MUÑOZ, A.; TIGINYANU, I. M.; URSAKI, V. V. (American Institute of Physics, 2013)
    In this work, we report on high-pressure Raman scattering measurements in mercury digallium sulfide (HgGa2S4) with defect chalcopyrite structure that have been complemented with lattice dynamics ab initio calculations. Our ...
  • Focusing effect of photonic crystal concave lenses made from porous dielectrics 
    SERGENTU, V. V.; FOCA, E.; LANGA, S.; CARSTENSEN, J.; FÖLL, H.; TIGINYANU, I. M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2004)
    In the present paper we show the photonic band structure and transmittance spectra of photonic crystal (PC) consisting of porous dielectric and compare the results with the earlier published. Frequency ranges, where PC can ...
  • Structural and optical high-pressure study of spinel-type MNIN2S4 
    MANJÓN, F. J.; SEGURA, A.; AMBOAGE, M.; PELLICER-PORRES, J.; SÁNCHEZ-ROYO, J. F.; ITIÉ, J. P.; FLANK, A. M.; LAGARDE, P.; POLIAN, A.; URSAKI, V. V.; TIGINYANU, I. M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2007)
    We report a combined study of the structural and electronic properties of the spinel-type semiconductor MnIn2S4 under high pressures by means of X-ray diffraction (ADXRD), X-ray absorption (XAS), and optical absorption ...
  • Design of negative-refractive-index materials on the basis of rods with a gradient of the dielectric constant 
    SERGENTU, V. V.; URSAKI, V. V.; TIGINYANU, I. M.; FOCA, F.; FÖLL, H.; BOYD, Robert W. (American Institute of Physics, 2007)
    The authors propose an approach to the design of negative-refractive-index materials based on the use of dielectric rods with a gradient of the dielectric constant. A triangular-lattice photonic crystal assembled from ...
  • Lattice dynamics study of HgGa2Se4 at high pressures 
    VILAPLANA, R.; GOMIS, O.; MANJÓN, F. J.; ORTIZ, H.; PÉREZ-GONZÁLEZ, E.; LÓPEZ-SOLANO, J.; RODRÍGUEZ-HERNÁNDEZ, P.; MUÑOZ, A.; ERRANDONEA, D.; URSAKI, V. V.; TIGINYANU, I. M. (American Chemical Society, 2013)
    We report on Raman scattering measurements in mercury digallium selenide (HgGa2Se4) up to 25 GPa. We also performed, for the low-pressure defect-chalcopyrite structure, lattice-dynamics ab initio calculations at high ...
  • 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 ...
  • Porosity-induced gain of luminescence in CdSe 
    MONAICO, E.; URSAKI, V. V.; URBIETA, A.; FERNÁNDEZ, P.; PIQUERAS, J.; BOYD, R. W.; TIGINYANU, I. M. (IOP Publishing, 2004)
    Porous CdSe layers have been produced by anodic etching of crystalline substrates in a HCl solution. Anodization under in situ UV illumination resulted in the formation of uniformly distributed parallel pores with a diameter ...
  • Fröhlich vibrational modes in porous ZnSe studied by Raman scattering and Fourier transform infrared reflectance 
    IRMER, G.; MONAICO, E.; TIGINYANU, I. M.; GÄRTNER, G.; URSAKI, V. V.; KOLIBABA, G. V.; NEDEOGLO, D. D. (IOP Publishing, 2009)
    Arrays of parallel pores with a diameter of around 60 nm have been introduced by anodic etching in ZnSe single crystals with a free electron concentration of 4 × 1017 cm−3. Porosity-induced Fröhlich vibrational modes were ...
  • X-ray diffraction study on pressure-induced phase transformations and the equation of state of ZnGa2Te4 
    ERRANDONEA, D.; KUMAR, R. S.; GOMIS, O.; MANJÓN, F. J.; URSAKI, V. V.; TIGINYANU, I. M. (AIP Publishing LLC, 2013)
    We report on high-pressure x-ray diffraction measurements up to 19.8 GPa in zinc digallium telluride (ZnGa2Te4) at room temperature. An irreversible structural phase transition takes place at pressures above 12.1 GPa and ...
  • Temperature dependence of Raman scattering in porous gallium phosphide 
    URSAKI, V. V.; TIGINYANU, I. M.; RICCI, P. C.; ANEDDA, A.; FOCA, E. V.; SYRBU, N. N. (IOP Publishing, 2001)
    Porous layers fabricated by electrochemical anodization of (111)A-oriented n-GaP:Te substrates were studied by Raman scattering spectroscopy in the temperature interval from 10 to 300 K. Along with the transverse-optical ...

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