Colecția instituțională: Recent submissions

  • Seeking solutions to enhancing competitiveness of Moldovan universities: implementation of problem-based learning 
    COTELNIC, Ala (Technical University of Moldova, 2017)
    Higher education institutions are considered to be an institutional resource absolutely indispensable for an economy in the process of building a knowledge society and achieving the objectives of redefining the foundations ...
  • Changing the higher education paradigm in Moldova: the steady necessity in today’s world 
    DOROGAIA, Irina (Technical University of Moldova, 2017)
    The Problem-Based Learning (PBL) is a conceptually new model of higher education that involves student-centered learning and actively engages students in problem solving. PBL speaks to the current world’s challenges and ...
  • Universities in social engagement 
    SØRENSEN, Olav Jull (Technical University of Moldova, 2017)
    Universities are increasingly challenged to redefine their role in society and the financial support to universities is increasingly related to the extent to which universities take upon them these new roles. Universities ...
  • Balancing teaching and research in a PBL CONTEXT: enhancing AAU PBL model 
    TURCAN, Romeo V. (Technical University of Moldova, 2017)
    The balance between research and teaching in a PBL environment is discussed in this paper. Traditionally, research-based teaching is well embedded in PBL-based teaching and learning models or environments. In this context ...
  • A comparison of pores in silicon and pores in III–V compound materials 
    CHRISTOPHERSEN, M.; LANGA, S.; CARSTENSEN, J.; TIGINYANU, I. M.; FÖLL, H. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2003)
    This paper compares the morphologies of porous silicon and porous III–V compounds and discusses their growth mechanisms. Looking into the fine structure of pores, in silicon (meso)pores with intercalating octahedra are ...
  • Three-dimensional Aerographite-GaN hybrid networks: single step fabrication of porous and mechanically flexible materials for multifunctional applications 
    SCHUCHARDT, Arnim; BRANISTE, Tudor; MISHRA, Yogendra K.; DENG, Mao; MECKLENBURG, Matthias; STEVENS-KALCEFF, Marion A.; RAEVSCHI, Simion; SCHULTE, Karl; KIENLE, Lorenz; ADELUNG, Rainer; IGINYANU, Ion T (Springer Nature, 2015)
    Three dimensional (3D) elastic hybrid networks built from interconnected nano- and microstructure building units, in the form of semiconducting-carbonaceous materials, are potential candidates for advanced technological ...
  • Strong light scattering and broadband (UV to IR) photoabsorption in stretchable 3D hybrid architectures based on aerographite decorated by ZnO nanocrystallites 
    TIGINYANU, Ion; GHIMPU, Lidia; GRÖTTRUP, Jorit; POSTOLACHE, Vitalie; MECKLENBURG, Matthias; STEVENS-KALCEFF, Marion A.; URSAKI, Veaceslav; PAYAMI, Nader; FEIDENHANSL, Robert; SCHULTE, Karl; ADELUNG, Rainer; MISHRA, Yogendra Kumar (Springer Nature, 2016)
    In present work, the nano- and microscale tetrapods from zinc oxide were integrated on the surface of Aerographite material (as backbone) in carbon-metal oxide hybrid hierarchical network via a simple and single step ...
  • High-pressure effects on the optical-absorption edge of CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels 
    RUIZ-FUERTES, J.; ERRANDONEA, D.; MANJÓN, F. J.; MARTÍNEZ-GARCÍA, D.; SEGURA, A.; URSAKI, V. V.; TIGINYANU, I. M. (American Institute of Physics, 2008)
    The effect of pressure on the optical-absorption edge of CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels at room temperature is investigated up to 20 GPa. The pressure dependence of their band-gaps has been analyzed using the ...
  • Pore Etching in III-V and II-VI Semiconductor Compounds in Neutral Electrolyte 
    TIGINYANU, I. M.; URSAKI, V. V.; MONAICO, E.; FOCA, E.; FÖLL, H. (The Electrochemical Society, 2007)
    We propose to use a neutral electrolyte based on an aqueous solution of instead of commonly used aggressive acids or alkaline electrolytes for the purpose of electrochemical nanostructuring of and substrates. It is shown ...
  • Porous III–V compounds as nonlinear optical materials 
    TIGINYANU, I. M.; KRAVETSKY, I. V.; LANGA, S.; MAROWSKY, G.; MONECKE, J.; FÖLL, H. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2003)
    Electrochemical etching is shown to represent a unique approach for tailoring linear and nonlinear optical properties of III–V compounds. We demonstrate that under defined etching conditions uniformly distributed pores ...
  • Ordered arrays of metal nanotubes in semiconductor envelope 
    TIGINYANU, Ion; MONAICO, Elena; MONAICO, Eduard (ELSEVIER, 2008)
    We report on fabrication of metal nanotubes in semiconductor nanotemplates possessing ordered two-dimensional hexagonal arrays of pores grown in n-InP crystalline substrates using anodic etching in neutral electrolyte. ...
  • High-pressure x-ray diffraction study on the structure and phase transitions of the defect-stannite ZnGa2Se4 and defect-chalcopyrite CdGa2S4 
    ERRANDONEA, D.; KUMAR, Ravhi S.; MANJÓN, F. J.; URSAKI, V. V.; TIGINYANU, I. M. (American Institute of Physics, 2008)
    X-ray diffraction measurements on the sphalerite-derivatives ZnGa2Se4ZnGa2Se4 and CdGa2S4CdGa2S4 have been performed upon compression up to 23 GPa in a diamond-anvil cell. ZnGa2Se4ZnGa2Se4 exhibits a defect tetragonal ...
  • Correlation between morphology and cathodoluminescence in porous GaP 
    STEVENS-KALCEFF, M. A.; TIGINYANU, I. M.; LANGA, S.; FÖLL, H.; HARTNAGEL, H. L. (American Institute of Physics, 2001)
    Porous layers fabricated by anodic etching of n-GaPn-GaP substrates in a sulfuric acid solution were studied by electron microscopy and cathodoluminescence (CL) microanalysis. The morphology of porous layers was found to ...
  • Single crystalline 2D porous arrays obtained by self organization in n-Inp 
    LANGA, S.; CHRISTOPHERSEN, M.; CARSTENSEN, J.; TIGINYANU, I. M.; FÖLL, H. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2003)
    Self organization is a rather common phenomenon during pore formation in III–V semiconductors. The so called tetrahedron-like pores, the domains of crystallographically oriented pores in n-GaAs, or the macroscopic voltage ...
  • Fröhlich modes in porous III-V semiconductors 
    SARUA, A.; MONECKE, J.; IRMER, G.; TIGINYANU, I. M.; GÄRTNER, G.; HARTNAGEL, H. L. (IOP Publishing, 2001)
    Porous GaP, InP and GaAs structures fabricated by MeV ion-implantation-assisted electrochemical etching were investigated by Raman and Fourier transform infrared spectroscopy. Fröhlich modes in the frequency gap between ...
  • Fröhlich modes in gan columnar nanostructures 
    TIGINYANU, I. M.; SARUA, A.; IRMER, G.; MONECKE, J.; HUBBARD, S. M.; PAVLIDIS, D.; VALIAEV, V. (American Physical Society, 2001)
    GaN columnar nanostructures fabricated by electrochemical dissolution of bulk material have been studied by micro-Raman spectroscopy. The anodization induces an increase in the intensity of Raman scattering accompanied by ...
  • Porous III–V compound semiconductors: formation, properties, and comparison to silicon 
    FÖLL, H.; CARSTENSEN, J.; LANGA, S.; CHRISTOPHERSEN, M.; TIGINYANU, I. M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2003)
    Pore formation in n-type III–V semiconductors will be discussed and compared to pore formation in silicon. While by now many different kinds of pores were produced in silicon, the “pore zoology” in III–Vs was rather limited ...
  • Observation of crossing pores in anodically etched n-GaAs 
    LANGA, S.; CARSTENSEN, J.; CHRISTOPHERSEN, M.; FÖLL, H.; TIGINYANU, I. M. (American Institute of Physics, 2001)
    Pores in GaAs in the micrometer range and oriented in |111| directions have been observed during the anodization of GaAs in aqueous HCl electrolytes. A direct evidence of pores intersection is presented which is a very ...
  • 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 ...
  • Time resolved blue and ultraviolet photoluminescence in porous GaP 
    ANEDDA, A.; SERPI, A.; KARAVANSKII, V. A.; TIGINYANU, I. M.; ICHIZLI, V. M. (American Institute of Physics, 1995)
    Porous GaP layers prepared by electrochemical anodization of (100)-oriented bulk material was found to exhibit blue and ultraviolet photoluminescence when excited by a KrF excimer laser. The energy position of the UV ...

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