UTM: Recent submissions

  • New take-off of Gallium Nitride 
    TIGINYANU, Ion (Technical University of Moldova, 2015)
    Gallium Nitride (GaN) is a wide-band-gap semiconductor compound (Eg = 3.4 eV at 300 K) which over the last decades played a major role in the development of modern solid-state lighting industry. An intensive investigation ...
  • Theory of Catalytic Micro- and Nanoengines: From Self-Propulsion Mechanisms to Remediation of Polluted Water 
    FOMIN, V. (Technical University of Moldova, 2015)
    A review is given of the theoretical ideas concerning the propulsion mechanisms of the catalytic micro- and nanoengines, which are prospective in robotics, biomedical engineering and environmental sustainability. Enhanced ...
  • Bioinspired Optical Materials 
    ZOLLFRANK, Cordt (Universitatea Tehnică a Moldovei, 2015)
    Natural systems are able to produce materials with unique properties. The formation of complex three-dimensional structures in nature is of fundamental importance to break the limits imposed by available construction ...
  • Plasmonic Effects for Enhanced Optical Mixing in view of THz Signal Generation 
    HARTNAGEL, Hans (Technical University of Moldova, 2015)
    First various graphene realizations of electronic circuitry examples are described. These represent application examples for the new material graphene. Then compact THz sources are presented involving optical laser mixing, ...
  • Light interacting with interconnected Nanomaterials: from extreme absorbers to fast sensors 
    ADELUNG, Rainer (Technical University of Moldova, 2015)
    Almost perfect black and white materials can be created on the basis of highly porous 3D materials from metal oxide semiconductors like ZnO or SnO2 in a flame transport synthesis. The white appearance originates by the ...
  • Fabrication of ultrathin GaN membranes with relatively large sizes for practical applications 
    CIOBANU, Vladimir; BRANISTE, Tudor; POPA, Veaceslav; GRIDENCO, Oleg; BATIRI, Mihail; TIGINYANU, Ion (Technical University of Moldova, 2015)
    We propose for the implementation a cost effective technological route allowing one to fabricate ultrathin GaN membranes for sensor applications. The main efforts are focused on the design and development of active parts ...
  • Optoelectronic properties of gallium nitride thin membranes 
    BRANISTE, Tudor; POPA, Veaceslav; VOLCIUC, Olesea; TIGINYANU, Ion (Romanian Academy, 2015)
    We present the results of a systematic study of persistent photoconductivity (PPC) generated by UV-excitation in thin membranes based on crystalline GaN. The PPC was found to be optically quenched under extrinsic excitation ...
  • TiO2 nanotubular structures for optoelectronic and photonic applications 
    ENACHI, Mihai; CIOBANU, Vladimir; SERGENTU, Vladimir; URSAKI, Veaceslav (Romanian Academy, 2015)
    We prove analytically that metallized TiO2 nanotubular structures are characterized by negative refractive index which opens the possibility for their use as cost-effective focusing elements. Flat and concave lenses assembled ...
  • Plasma based nanoparticle synthesis: from preparation to function 
    POLONSKYI, Oleksandr; VAHL, A.; DREWES, J.; HINZ, A.; STRUNSKUS, T.; ABABII, N.; REIMER, T.; CHEMNITZ, S.; LUPAN, O.; ADELUNG, R.; FAUPEL, F. (Sumy State University, 2018)
    In this paper, we report on a recent progress in formation and deposition of NPs by the gas aggregation method. Examples range from noble (Au, Ag), through reactive (Al) to more advanced core-shell nanostructures [4]. The ...
  • Optimizarea constructiv–funcțională a rotoarelor elicoidale cu ax vertical în vederea eficientizării conversiei energiei eoliene 
    RABEI, Ivan (Universitatea Tehnică a Moldovei, 2022)
    Scopul lucrării: Sporirea eficienței de conversie a rotoarelor elicoidale cu ax vertical prin optimizarea parametrilor geometrici. Obiectivele cercetării sânt: cercetarea profilurilor aerodinamice recomandate pentru ...
  • TEM investigation on new microstructures and properties of GaN 
    SCHÜRMANN, U.; WOLFF, N.; CIOBANU, V.; DENG, M.; KAMP, M.; RAEVSCHI, S.; BRANISTE, T.; SCHÜTT, F.; ADELUNG, R.; TIGINYANU, I.; KIENLE, L. (Australian Microscopy & Microanalysis Society, 2018)
    Gallium Nitride (GaN) is a wide-bandgap semiconductor compound with several applications in the field of optoelectronics, field-effect transistors and sensors. Different novel and outstanding GaN morphologies were analyzed ...
  • Instalaţie eoliană cu ax vertical 
    BOSTAN, Viorel; BOSTAN, Ion; DULGHERU, Valeriu; PORCESCU, Gavril; RABEI, Ion (Universitatea Tehnică din Cluj-Napoca, 2017)
    Pentru a mări eficienţa de conversie a energiei eoliene la viteze V=2...5 m/s a fost elaborat un organ de lucru nou bazat pe acţiunea combinată a turbinelor Darreus şi Savonius. Rotorul turbinei Darreus este legat cu ...
  • Instalație de conversie a energiei eoliene 
    BOSTAN, Viorel; BOSTAN, Ion; DULGHERU, Valeriu; GUȚU, Marin; RABEI, Ion; VACULENCO, Maxim; CIOBANU, Radu; CIOBANU, Oleg (Universitatea Tehnică din Cluj-Napoca, 2018)
    Invenţia se referă la sisteme de conversie a energiilor regenerabile, şi anume la instalaţii de conversie a energiei eoliene. Instalaţia de conversie a energiei eolienne include un turn, în care la diferite înălţimi ...
  • Wind energy conversion plant 
    BOSTAN, Viorel; BOSTAN, Ion; DULGHERU, Valeriu; GUȚU, Marin; RABEI, Ion; VACULENCO, Maxim; CIOBANU, Radu; CIOBANU, Oleg (Romanian Inventors Forum, 2018)
    The invention relates to renewable energy conversion systems, in particular to wind energy conversion devices. The wind energy conversion plant comprises a tower, in which at different heights H1=f(Vnom) and, respectively, ...
  • Turbină eoliană cu ax vertical 
    BOSTAN, Ion; BOSTAN, Viorel; DULGHERU, Valeriu; CIOBANU, Oleg; CIOBANU, Radu; GUŢU, Marin; RABEI, Ion; GRADÎȘ, Vitalie; ODAINÂI, Valeriu (Universitatea Tehnică din Cluj-Napoca, 2019)
    Turbina eoliană include un rotor cu ax vertical cu trei pale cu profil aerodynamic asimetric. Pentru a mări eficienţa de conversie a energiei eoliene palele sunt elicoidale și reglabile. Rotorul turbinei este legat cu ...
  • Aeolian turbine with Vertical Axle 
    BOSTAN, Ion; BOSTAN, Viorel; DULGHERU, Valeriu; CIOBANU, Oleg; CIOBANU, Radu; GUŢU, Marin; RABEI, Ion; GRADÎȘ, Vitalie; ODAINÂI, Valeriu (Romanian Inventors Forum, 2019)
    The wind turbine includes a three-bladed vertical-axis rotor with asymmetrical aerodynamic profile. To increase the efficiency of conversion of wind energy, the blades are helical and adjustable. The turbine rotor is ...
  • Pală pentru rotorul turbinei eoliene cu ax vertical 
    CIUPERCĂ, Rodion; RABEI, Ivan (Universitatea Tehnică din Cluj-Napoca, 2020)
    Invenția se referă la mașinile de conversie a energiei eoliene și anume la turbinele eoliene cu ax vertical în caz general și, în caz particular, la forma constructivă a profilului palelor rotorului turbinelor eoliene cu ...
  • Aerodynamic wind rotor with vertical axis with variable angle of attack 
    BOSTAN, Viorel; BOSTAN, Ion; DULGHERU, Valeriu; CIUPERCĂ, Rodion; VACULENCO, Maxim; GUȚU, Marin; CIOBANU, Radu; CIOBANU, Oleg; ODAINÎI, Valeriu; GLADÂȘ, Vitalie; RABEI, Ion; PLATON, Andrei (Romanian Inventors Forum, 2020)
    The field of research refers to the creation of wind energy conversion devices, namely to the wind turbines with vertical axis. The wind turbine with vertical axis includes a tower on which a rotary shaft with blades with ...
  • Vertical Axis Wind Turbines: The Behavior of Lift and Drag Airfoils 
    BOSTAN, Viorel; BOSTAN, Ion; RABEI, Ivan; DULGHERU, Valeriu; CIUPERCA, Rodion (Springer International Publishing, 2019)
    The blade is the most important element of a wind turbine, as it is the component that largely governs the productivity and it is the main source of efficiency optimization. A blade is defined by the airfoil type. This ...
  • Numerical simulation of transient aerodynamic processes in the vertical axis wind turbine rotor 
    BOSTAN, Viorel; GUȚU, Marin; RABEI, Ion (Academia de Ştiinţe Tehnice din România, 2019)
    This paper describes the steps of elaboration of calculation model for dynamic simulation of a small vertical axis wind turbine rotor. The calculation model is based on the finite element analysis ANSYS CFX software. The ...

Search DSpace

Browse

My Account