Articole ştiinţifice: Recent submissions

  • 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 ...
  • Icone-ul sacru in creaţia lui Vladimir Borovikovsky 
    PODLESNAIA, Natalia (Academia de Muzică, Teatru şi Arte Plastice, 2013)
    În prezentul articol ştiinţific se propune elucidarea unui aspect important din creaţia lui V. Borovikovsky, trecut cu vederea pe parcursul secolului XX — şi anume a celui legat de arta icoanei/tabloului religios. Se pune ...
  • 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 ...
  • Incursiuni în istoria surselor scrise despre tehnologiile picturii monumentale 
    PODLESNAIA, Natalia; STARŢEV, Ala (Academia de Muzică, Teatru şi Arte Plastice, 2012)
    Articolul de faţă pune în vizor ştiinţific izvoarele scrise despre tehnicile şi tehnologiile picturii monumentale (fresca, alsecco, mozaicul, sgraffito-ul şi vitrariul) pe parcursul evoluţiei acestora în cadrul istoriei ...
  • Manganul şi molibdenul în solurile şi plantele de pădure 
    COJUHARI, Tamara; VRABIE, Tatiana; PANĂ, Sergiu (Muzeul Naţional de Etnografie şi Istorie Naturală, 2015)
    The paper presents the results of research on physiologically important microelements Mn and Mo in soils and herbaceous forest plants, analyzed in relation to seasonal variations in soil and herbaceous species. Has been ...
  • Fundamentele culturii din perspectiva reflecţiei filosofice 
    LOZOVANU, Ecaterina (Universitatea de Stat de Medicină şi Farmacie „Nicolae Testemiţanu“, 2013)
    The philosophical reflection of culture’s foundation is a prerequisite for the development of science. It is presented as a specific aspect of philosophical understanding of reality, in which new categorical structures ...
  • Microelementele in solurile si plantele de padure 
    COJUHARI, Tamara; VRABIE, Tatiana; PANĂ, Sergiu; STRATULAT, Petru; VORONŢOV, Veaceslav; COJUHARI, Ion; ANGHEL, Liubovi; ZUBKOVA, Tatiana; MASLOV, Eugen (Muzeul Naţional de Etnografie şi Istorie Naturală, 2014)
    În baza cercetărilor de teren şi laborator s-au analizat microelementele Ti, Cr şi V din solurile şi plantele ierboase din cadrul a 3 biocenoze din rezervaţia „Codrii”. S-a constatat că formele totale şi mobile ale elementelor ...
  • Particularităţile luminescenţei tioindatului de zinc dopat cu mangan 
    ARAMĂ, Efim; VOVC, Victor; GHEORGHIŢĂ, Eugen; PANTEA, Valeriana; MUNTEANU-GUBCEAC, Natalia; MELINTE, Victoria (Universitatea de Stat de Medicină şi Farmacie „Nicolae Testemiţanu“, 2013)
    Radiative recombination spectra of Mn-doped zinc tioindat single crystals have been analyzed in the work. The emission spectra interval close to its maximum (1,91±0,2) eV contains a number of the special features which ...
  • Caracterizarea stării fizice a solurilor de pădure din suprafeţele de supravegere din rezervaţia „Codrii” (I) 
    COJUHARI, Tamara; VRABIE, Tatiana; KRUPENIKOV, Igor; STRATULAT, Petru; CRIVOV, Ludmila; VORONŢOV, Veaceslav; COTERNEAC, Pavel (Muzeul Naţional de Etnografie şi Istorie Naturală, 2013)
    Lucrarea dată prezintă analiza stării hidrofizice a solurilor reprezentative din Rezervaţia “Codrii”, în cadrul a trei parcele de supravegere continuă, în funcţie de tipul de vegetaţie. Raporturile indicilor calitativi şi ...
  • Studierea posibilităţii de fabricare a produselor aglutenice de panificaţie din făina de porumb 
    RUMEUS, Iurii; MELENCIUC, Mihail; GHENDOV-MOŞANU, Aliona (Universitatea de Stat „Bogdan Petriceicu Hasdeu“, Cahul, 2012)
    This study is devoted to the development of production technology of protein-free bakery products using corn flour, for people suffering from chronic kidney diseases and gluten enterapathy.
  • 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 ...

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