Browsing Articole ştiinţifice by Title

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  • 1/f-noise prediction in millimeter wave detectors based on quasi vertical Schottky diodes 
    HOEFLE, Matthias; PENIRSCHKE, Andreas; COJOCARI, Oleg; AMRHEIN, Andreas; DECOOPMAN, Thibaut; PIIRONEN, Petri; JAKOBY, Rolf (IEEE, 2013)
    A modeling concept for accurate prediction of 1/f-noise in millimeter wave Schottky detectors is presented. The concept is based on DC bias current measurements with precise knowledge of the diode structure. Key aspect is ...
  • 11 - Ultra-thin membranes for sensor applications 
    TIGINYANU, I.; URSAKI, V.; POPA, V. (Woodhead Publishing, 2011)
    Technological approaches for the fabrication of ultra-thin membranes for sensor applications are reviewed, with the main focus on graphene and two-dimensional (2D) sheets of layered compounds such as BN, MoS2, Bi2Te3, ...
  • 183 GHz Mixer on InGaAs Schottky Diodes 
    OPREA, I.; WALBER, A.; COJOCARI, O.; GIBSON, H.; ZIMMERMANN, R.; HARTNAGEL, H. L. (Oxford, 2010)
    This work reports on experimental results of a 183 GHz sub-harmonically pumped mixer based on InGaAs antiparallel diode pair. The diode structure provides extremely low parasitic capacitance of about 2.5 fF. Roughly estimated ...
  • 2D/3D Heat Transport Maps of Biological Tissue in Therapeutic Hypothermia 
    COJOCARU, Victor; SIDORENKO, Anatol; VRABII, Daniel (Editura Academiei Romane, 2016)
    Strokes are an acute neurological disorder resulting from blockage of blood supply to an area of the brain or cerebral hemorrhage. Strokes are a clinical syndrome produced by brain tissue damage following ischemic events. ...
  • 3D FEM model for Hopkinson Split Torsional (Kolsky) Bar experimental technique 
    MAZURU, Alexandru; MATACHE, Liviu-Cristian; ROTARIU, Adrian-Nicolae (Professional Association in Modern Manufacturing Technologies (ModTech), 2023)
    In this paper, a 3D FEM model for Hopkinson Split Torsional (Kolsky) Bar experimental technique was made, in order to study the mechanical behavior of some high entropy alloys (HEA). A virtual model of the TSHB system, ...
  • 3D modeling of the Peierls transition in TTF-TCNQ organic crystals 
    ANDRONIC, Silvia (Academy of Sciences of Moldova, 2015)
    The Peierls structural transition in quasi-one-dimensional (Q1D) TTF-TCNQ organic crystals of is studied in the 3D approximation. Two the most important electron-phonon interactions are considered. The analytic expression ...
  • 3D-Printed Chemiresistive Sensor Array on Nanowire CuO/Cu2O/Cu Heterojunction Nets 
    SIEBERT, Leonard; LUPAN, Oleg; MIRABELLI, Mattia; ABABII, Nicolai; TERASA, Maik-Ivo; KAPS, Sören; CRETU, Vasilii; VAHL, Alexander; FAUPEL, Franz; ADELUNG, Rainer (American Chemical Society, 2019)
    In this work, the one-step three-dimensional (3D) printing of 20 nm nanowire (NW)-covered CuO/Cu2O/Cu microparticles (MPs) with diameters of 15–25 μm on the surface of the glass substrate forming an ordered net is successfully ...
  • 3D–2D crossover in melting transition on superconducting Mo/Si multilayers 
    FOGEL, Nina Ya.; CHERKASOVA, V. G.; RYBALCHENKO, V. N.; KORETZKAYA, O. A.; SIDORENKO, A. S. (Springer Nature Switzerland, 1996)
    Two-dimensional and three-dimensional vortex-lattice melting is observed on superconducting Mo/Si multilayers. Quasi-2D melting takes place in the range of high magnetic fields. The position of the melting transition on ...
  • 600 GHz GaAs Schottky diode mixer in split-block technology 
    SCHUR, J.; BIBER, S.; COJOCARI, O.; SCHMIDT, L.-P.; HARTNAGEL, H.-L. (IEEE, 2013)
    In this paper we present measurement results of a micro-machined split-block waveguide mixer for 600 GHz. The mixer implements a planar GaAs Schottky diode on a quartz substrate. Two different diode designs used for this ...
  • A 600GHz High Power Tripler for Space Applications 
    GIBSON, Hugh J.; COJOCARI, Oleg; OPREA, Ion; THOMAS, Bertrand; NARHI, Tapani (Oxford, 2015)
    Several recent space missions have required un-cooled receivers for radiometer use above 500GHz for atmosphere probing. These include MetOP 2nd generation meteorological satellites and Jupiter Moons JUICE spacecraft. The ...
  • 89 GHz Schottky detector modules for MetOp-SG 
    HOEFLE, Matthias; COJOCARI, Oleg; RICKES, Martin; SOBORNYTSKYY, Mykola; MONTERO-DE-PAZ, Javier; DECOOPMAN, Thibaut; KANTANEN, Mikko; PÉRICHAUD, Marie-Genevieve; PIIRONEN, Petri (IEEE, 2016)
    Presented is an 89 GHz waveguide coupled direct detector based on ACST low-barrier Schottky diodes. Signal-to-noise ratio (SNR) values above 35 dB within 6 dB input power dynamic are achieved with high voltage responsivity ...
  • 89 GHz zero-bias Schottky detector for direct detection radiometry in European satellite programme MetOp-SG 
    HOEFLE, M.; PENIRSCHKE, A.; COJOCARI, O.; DECOOPMAN, T.; TRIER, M.; PIIRONEN, P.; PÉRICHAUD, M. G.; JAKOBY, R. (The Institution of Engineering and Technology, 2014)
    An 89 GHz waveguide coupled direct detector based on a low-barrier Schottky diode is presented. The main focus is to reduce white and 1/f noise to achieve high signal-to-noise ratio values above 35 dB. The design also ...
  • AB2X4 Compounds with Other Types of Structures at High Pressures 
    URSAKI, V. V.; TIGINYANU, I. M. (Springer-Verlag Berlin Heidelberg, 2014)
    Phase transitions in AIIBIII2XVI4 compounds with initial structures different from cubic spinel or tetragonal chalcopyrites and stannites are analyzed in this chapter on the instance of layered AIIInGaS4 crystals with Cd, ...
  • The ability of actinobacteria from silt sediments of the lake system "La izvor" (Chisinau) to delay the growth of phytopathogenic microorganisms 
    BURȚEVA, Svetlana; BÎRSA, Maxim (Consiliul Județean Bacău, 2022)
    From the silt sediments of the lake system La Izvor, 36 strains of actinobacteria were isolated, in which their antimicrobial activity was determined against a number of phytopathogenic bacteria and fungi.
  • The ability of sea buckthorn to fight against L. monocytogenes 
    COJOCARI, Daniela ("Alma Mater" Publishing House, Bacau, 2021)
    The objective of the study was to determine the antibacterial activity of sea buckthorn in vitro on L. monocytogenes ATCC 19118 and L. monocytogenes EGDe. The antimicrobial effect of sea buckthorn was achieved by the agar ...
  • Abordarea bibliometrică în analiza dinamicii de dezvoltare a științei și societății 
    CUJBA, Rodica (Academia de Ştiinţe a Moldovei, 2019)
    Science can be seen as a process of obtaining new information. This process has a consecutive and collective character: any scientific work is based on a number of previously published ideas. In other words, new scientific ...
  • Abordarea e-learning în învățământul superior 
    HAVRIC, Alina; BURDILA, Lilia (Universitatea de Stat din Tiraspol, 2021)
    This paper has the aim to highlight the role and implementation of e-Learning mainly in the challenging situation of pandemics in the system of Higher Education. The objective of elearning is to provide efficient applications ...
  • Abordarea plastică a figurativului în pictura moldovenească a anilor ’60 ai secolului al XX-lea 
    PLATON, Liliana (Institutul Patrimoniului Cultural al AȘM, 2019)
    Prezentul articol urmărește să evidențieze procesul și tendințele de abordare plastică din pictura figurativă moldovenească din anii ’60 ai secolului al XX-lea. În această perioadă se remarcă un interes sporit pentru ...
  • Abordarea protecției proprietății intelectuale în programele-cadru pentru cercetare și inovare ale Uniunii Europene 
    POSTORONCĂ, Sveatoslav (Agentia de Stat pentru Proprietatea Intelectuala a Republicii Moldova (AGEPI), 2021)
    Poziția IMM-urilor în activitățile de cercetare și inovare conectate direct la piața produselor și a serviciilor este una din preocupările-cheie din cadrul dezvoltării globale. În acest context, subiectele din aria ...
  • Abordarea sistemică în cercetarea sistemului regional de inovare 
    PRIPA, Stela (Universitatea de Stat „Alecu Russo”, Balţi, 2022)
    Innovation is a systemic and economic process, it results from a continuous interaction between various factors and its approach requires a broad horizontal vision. The clear and complete picture of the national innovation ...

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