Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering: Recent submissions

Now showing items 241-260 of 1036

    • Article  

      Analytic models of heterogenous magnetic fields for liquid metal flow simulations 

      Votyakov, E. V.; Kassinos, Stavros C.; Albets-Chico, X. (2009)
      A physically consistent approach is considered for defining an external magnetic field as needed in computational fluid dynamics problems involving magnetohydrodynamics (MHD). The approach results in simple analytical ...
    • Article  

      Multilayer composite ceramic-metal-DLC coatings for sliding wear applications 

      Voevodin, A. A.; Schneider, J. M.; Rebholz, Claus; Matthews, A. (1996)
      The design of anti-friction coatings able to perform well in different wear conditions without lubricants requires a combination of adequate hardness and toughness, good adhesion, a low friction coefficient and a low wear ...
    • Article  

      Active process control of reactive sputter deposition 

      Voevodin, A. A.; Stevenson, P.; Rebholz, Claus; Schneider, J. M.; Matthews, A. (1995)
      Control of the density, composition, ionisation rate and arrival energy of species is one of the main objectives of research in the development of reactive magnetron sputtering. The deposition of the latest generation of ...
    • Article  

      Effect of antimony-doping and germanium on the highly efficient thermoelectric Si-rich-Mg2(Si,Sn,Ge) materials 

      Vlachos, N.; Polymeris, G. S.; Manoli, M.; Hatzikraniotis, E.; Khan, A. U.; Lioutas, C. B.; Stefanaki, E. C.; Pavlidou, E.; Paraskevopoulos, K. M.; Giapintzakis, John; Kyratsi, Theodora (2017)
      Two series of materials (a) Mg2Si0.55-ySn0.4Ge0.05Sby, 0 ≤ y ≤ 0.0175 and (b) Mg2Si0.5875-xSn0.4GexSb0.0125, 0 ≤ x ≤ 0.20 have been developed and studied in terms of structural features and thermoelectric properties/performance. ...
    • Article  

      Flux pinning in YBa2Cu3O7 single crystals: Neutron irradiation and annealing 

      Vlcek, B. M.; Frischherz, M. C.; Fleshler, S.; Welp, U.; Liu, J. Z.; Downey, J.; Vandervoort, K. G.; Crabtree, G. W.; Kirk, M. A.; Giapintzakis, John; Farmer, J. (1992)
      Results of dc magnetization on neutron (n) -irradiated YBa2Cu3O7 single crystals are presented. The crystals were irradiated to a fluence of 2×1017 n/cm2 (E>0.1 MeV). The magnetization has been measured at 10, 40, and 70 ...
    • Article  

      Three-dimensional microscopy of the tumor microenvironment in vivo using optical frequency domain imaging 

      Vakoc, B. J.; Lanning, R. M.; Tyrrell, J. A.; Padera, T. P.; Bartlett, L. A.; Stylianopoulos, T.; Munn, L. L.; Tearney, G. J.; Fukumura, D.; Jain, R. K.; Bouma, Brett E. (2009)
      Intravital multiphoton microscopy has provided powerful mechanistic insights into health and disease and has become a common instrument in the modern biological laboratory. The requisite high numerical aperture and exogenous ...
    • Article  

      Effect of microstructure on the thermoelectric performance of La1−xSrxCoO3 

      Viskadourakis, Z.; Athanasopoulos, G. I.; Kasotakis, E.; Giapintzakis, John (2016)
      We present a case where the microstructure has a profound effect on the thermoelectric properties of oxide compounds. Specifically, we have investigated the effect of different sintering treatments on La1−xSrxCoO3 samples ...
    • Article  

      A Validated Multiscale In-Silico Model for Mechano-sensitive Tumour Angiogenesis and Growth 

      Vavourakis, V.; Wijeratne, P. A.; Shipley, R.; Loizidou, M.; Stylianopoulos, T.; Hawkes, D. J. (2017)
      Vascularisation is a key feature of cancer growth, invasion and metastasis. To better understand the governing biophysical processes and their relative importance, it is instructive to develop physiologically representative ...
    • Article  

      Very high thermoelectric power factor in a Fe3O4/SiO2/p-type Si(100) heterostructure 

      Viskadourakis, Z.; Paramês, M. L.; Conde, O.; Zervos, Matthew; Giapintzakis, John (2012)
      The thermoelectric and transport properties of a Fe3O4/SiO2/p-Si(100) heterostructure have been investigated between 100 and 300 K. Both Hall and Seebeck coefficients change sign from negative to positive with increasing ...
    • Book Chapter  

      Synthesis of Magnetic Nanoparticles and Magnetic Fluids for Biomedical Applications 

      Vekas, Ladislau; Tombácz, Etelka; Turcu, Rodica; Morjan, Iuliana; M, V. Avdeev; Krasia-Christoforou, T.; Socoliuc, V. (2011)
      Chemical coprecipitation and gas-phase laser pyrolysis procedures were applied to obtain various iron-based magnetic nanoparticles (magnetite, maghemite, and carbon layer-coated iron) in the size range of 3-15 nm used as ...
    • Article  

      The Effect of Ge on Mg2Si0.6−x Sn0.4Ge x Materials 

      Vlachos, N.; Hatzikraniotis, E.; Mihailescu, C. N.; Giapintzakis, John; Kyratsi, Theodora (2014)
      In this work, we investigate the influence of the introduction of Ge on the thermoelectric properties of Bi-doped quaternary Mg2Si0.6−x Sn0.4Ge x alloys. Mg2Si0.58−x Sn0.4Bi0.02Ge x materials were fabricated by a low ...
    • Article  

      Comparative tribology studies of hard ceramic and composite metal-DLC coatings in sliding friction conditions 

      Voevodin, A. A.; Rebholz, Claus; Matthews, A. (1995)
      The design of anti-friction coatings able to perform well in different wear conditions without lubricants requires a combination of adequate hardness and toughness, good adhesion, a low friction coefficient and a low wear ...
    • Article  

      Structure and mechanical properties of low temperature magnetron sputtered nanocrystalline (nc-)Ti(N,C)/amorphous diamond like carbon (a-C:H) coatings 

      Tsotsos, C.; Baker, M. A.; Polychronopoulou, K.; Gibson, P. N.; Giannakopoulos, K.; Polycarpou, A. A.; Böbel, K.; Rebholz, Claus (2010)
      This paper reports on the structure and mechanical properties of 2μm thick nanocomposite (nc-) Ti(N,C)/amorphous diamond like carbon (a-C:H) coatings deposited on 100Cr6 steel substrates, using low temperature ( 200°C) DC ...
    • Conference Object  

      In vivo imaging of microvasculature using optical coherence tomography 

      Vakoc, B. J.; Lanning, R. M.; Tyrrell, J. A.; Padera, T. P.; Bartlett, L. A.; Stylianopoulos, T.; Munn, L. L.; Tearney, G. J.; Fukumura, D.; Jain, R. K.; Bouma, Brett E. (Correspondence Address: Vakoc, B. J., 2010)
      In vivo imaging technologies drive the development of improved cancer therapies by revealing critical aspects of the complex pathophysiology of solid tumors in small animal models[1]. The abnormal vascular function, which ...
    • Article  

      Ultrafast time-resolved spectroscopy of In2 O3 nanowires 

      Tsokkou, D.; Othonos, A.; Zervos, Matthew (2009)
      Ultrafast carrier dynamics in In2 O3 nanowires with an average diameter of ≈100±20 nm grown by the vapor-liquid-solid method have been investigated in detail using differential absorption spectroscopy with femtosecond ...
    • Article  

      Surface effects in layered semiconductors Bi2Se3 and Bi2Te3 

      Urazhdin, S.; Bilc, D. I.; Mahanti, S. D.; Tessmer, S. H.; Kyratsi, Theodora; Kanatzidis, M. G. (2004)
      Scanning tunneling spectroscopy of Bi2Se3 and Bi2Te3 layered narrow gap semiconductors reveals finite in-gap density of states and suppressed conduction in the energy range of high valence-band states. Electronic structure ...
    • Article  

      Mechanical and high pressure tribological properties of nanocrystalline Ti(N,C) and amorphous C:H nanocomposite coatings 

      Tsotsos, C.; Polychronopoulou, K.; Demas, N. G.; Constantinides, G.; Gravani, S.; Böbel, K.; Baker, M. A.; Polycarpou, A. A.; Rebholz, Claus (2010)
      This paper reports on the mechanical and high pressure tribological properties of nanocrystalline (nc-) Ti(N,C)/amorphous (a-) C:H deposited, using low temperature (∼200°C) DC reactive magnetron sputtering. The mechanical ...
    • Article  

      Solvothermal synthesis, nanostructural characterization and gas cryo-adsorption studies in a metal–organic framework (IRMOF-1) material 

      Tzitzios, V.; Kostoglou, N.; Giannouri, M.; Basina, G.; Tampaxis, C.; Charalambopoulou, Georgia; Steriotis, T.; Polychronopoulou, K.; Doumanidis, C. C.; Mitterer, C.; Rebholz, Claus (2017)
      A nanoporous metal–organic framework material, exhibiting an IRMOF-1 type crystalline structure, was prepared by following a direct solvothermal synthesis approach, using zinc nitrate and terephthalic acid as precursors ...
    • Article  

      Defect states of chemical vapor deposition grown GaN nanowires: Effects and mechanisms in the relaxation of carriers 

      Tsokkou, D.; Othonos, A.; Zervos, Matthew (2009)
      Carrier relaxation in GaN nanowires, grown by atmospheric pressure chemical vapor deposition, via direct nitridation of Ga with NH3 at 950 °C has been investigated in detail. Differential absorption measurements reveal a ...
    • Article  

      Scanning tunneling microscopy of defect states in the semiconductor (formula presented) 

      Urazhdin, S.; Bilc, D. I.; Tessmer, S. H.; Mahanti, S. D.; Kyratsi, Theodora; Kanatzidis, M. G. (2002)
      Scanning tunneling spectroscopy images of (formula presented) doped with excess Bi reveal electronic defect states with a striking shape resembling clover leaves. With a simple tight-binding model, we show that the geometry ...