Browsing Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering by Title

Now showing items 810-829 of 1036

    • Article  

      Springback characteristics of a martensitic steel for warm U-shape bending: Experiments and FE simulation 

      Sun, Y.; Cai, Z.; Politis, Denis J.; Luan, X.; Chen, G.; Wang, L. (2019)
      Martensitic (MS) steel, a modern type of Ultra-high Strength Steel (UHSS), offers a significantly improved strength-to-weight ratio compared to conventional cold rolled steel grades. This is especially important for weight ...
    • Article  

      Squeeze flow of semi-solid slurries 

      Alexandrou, Andreas N.; Florides, G. C.; Georgiou, G. C. (2013)
      A standard method used to determine material properties of semi-solid slurries is the squeeze flow experiment
    • Article  

      Squeeze flow of thixotropic semisolid slurries 

      Alexandrou, Andreas N.; Florides, G. C.; Georgiou, G. (2014)
      An essential element for the integration of a semisolid process in the production of complex commercial components is the availability of accurate mathematical and computational tools that could describe both the rheological ...
    • Article  

      Stable finite element solutions of fully viscous compressible flows 

      Barsoum, M. E.; Alexandrou, Andreas N. (1995)
      This paper presents a stable approach to solve convection-dominated flows in the presence of compressibility effects. This approach employs the Petrov-Galerkin weighing to the FEM equations to achieve stability at the high ...
    • Article  

      Statistical measures of structural anisotropy in MHD turbulence subjected to mean shear and frame rotation 

      Kassinos, Stavros C.; Knaepen, B.; Wray, A. (2006)
      We consider homogeneous turbulence in a conducting fluid that is exposed to a uniform external magnetic field while being sheared in fixed and rotating frames. We take both the frame-rotation axis and the applied magnetic ...
    • Article  

      Steady Herschel-Bulkley fluid flow in three-dimensional expansions 

      Alexandrou, Andreas N.; McGilvreay, T. M.; Burgos, G. (2001)
      In this paper we study steady flow of Herschel-Bulkley fluids in a canonical three-dimensional expansion. The fluid behavior was modeled using a regularized continuous constitutive relation, and the flow was obtained ...
    • Article  

      Stochastic control for nanoparticle manipulation using electric fields 

      Kyprianou, Andreas; Loucaides, Neophytos; Polydorides, Nick; Georghiou, George E.; Charalambous, Charalambos D.; Doumanides, C. C. (2018)
      A simplified model is used to study the dynamics of a nanoparticle suspended in a fluid under Dielectrophoretic (DEP) force. The model considers the DEP force (considering only dipoles formed and not higher order polarisation) ...
    • Article  

      Stoichiometry and volume dependent transport in lithium ion memristive devices 

      Orfanidou, Charis M.; Ioannou, Panagiotis S.; Kyriakides, Evripides; Nicolaou, Christiana; Mihailescu, Cristian N.; Nguyen, Van Son; Mai, Van Huy; Schneegans, Olivier; Giapintzakis, John (2018)
      LixCoO2, a thoroughly studied cathode material used extensively in Li-ion rechargeable batteries, has recently been proposed as a potential candidate for resistive random access memory and neuromorphic system applications. ...
    • Conference Object  

      Stoichiometry issues in pulsed laser deposition of the ferromagnetic alloy NiMnSb 

      Grigorescu, C. E. A.; Monnereau, O.; Manea, S. A.; Notonier, R.; Klini, A.; Zorba, V.; Manousaki, A.; Giapintzakis, John; Fotakis, C. (Affiliation: NIRDO, BucharestAffiliation: MADIREL, Univ. Provence Centre St. Charles, Marseille, FranceAffiliation: Natl. Inst. Res. Devmt. Mat. Phy., BucharestAffiliation: Foundation for Res. and Technology, HELLAS, Inst. Electron. Structure and Laser, Heraklion, Crete, GreeceCorrespondence Address: Grigorescu, C.E.A.NIRDO, Bucharest, 2002)
      We report on the reproducible growth of stoichiometric thin films of ferromagnetic intermetallic compound NiMnSb by pulsed laser deposition (PLD) on various substrates. The films are grown at moderate temperature (around ...
    • Article  

      Stress alleviation strategy in cancer treatment: Insights from a mathematical model 

      Mpekris, Fotios; Voutouri, Chrysovalantis; Papageorgis, Panagiotis; Stylianopoulos, Triantafyllos (2018)
      Tumors generate mechanical forces during growth and progression, which are able to compress blood and lymphatic vessels, reducing perfusion rates and creating hypoxia. Tumor vessels—while nourishing the tumor—are usually ...
    • Article  

      Stress alleviation strategy in cancer treatment: Insights from a mathematical model 

      Mpekris, F.; Voutouri, C.; Papageorgis, P.; Stylianopoulos, T. (2018)
      Tumors generate mechanical forces during growth and progression, which are able to compress blood and lymphatic vessels, reducing perfusion rates and creating hypoxia. Tumor vessels-while nourishing the tumor-are usually ...
    • Article  

      Stress-mediated progression of solid tumors: effect of mechanical stress on tissue oxygenation, cancer cell proliferation, and drug delivery 

      Mpekris, F.; Angeli, S.; Pirentis, A. P.; Stylianopoulos, T. (2015)
      Oxygen supply plays a central role in cancer cell proliferation. While vascular density increases at the early stages of carcinogenesis, mechanical solid stresses developed during growth compress tumor blood vessels and, ...
    • Article  

      Strong paramagnetism and possible ferromagnetism in pure carbon nanofoam produced by laser ablation 

      Rode, A. V.; Gamaly, E. G.; Christy, A. G.; Gerald, J. G. Fitz; Hyde, S. T.; Elliman, R. G.; Luther-Davies, B.; Veinger, A. I.; Androulakis, J.; Giapintzakis, John (2005)
      We report the production of a hierarchically nanostructured magnetic carbon foam by high-repetition-rate laser ablation of glassy carbon in Ar. The clusters contain both sp2 and sp3 bonded carbon atoms. The material contains ...
    • Article  

      Structural and thermal characterization of La5Ca 9Cu24O41 thin films grown by pulsed laser deposition on (1 1 0) SrTiO3 substrates 

      Svoukis, E.; Athanasopoulos, G. I.; Altantzis, T.; Lioutas, C.; Martin, R. S.; Revcolevschi, A.; Giapintzakis, John (2012)
      In the present study stoichiometric, b-axis oriented La5Ca 9Cu24O41 thin films were grown by pulsed laser deposition on (1 1 0) SrTiO3 substrates in the temperature range 600-750 °C. High resolution transmission electron ...
    • Article  

      Structural Characterization and Thermoelectric Properties of Hot-Pressed CoSi Nanocomposites 

      Ioannou, M.; Symeou, E.; Giapintzakis, John; Kyratsi, Theodora (2014)
      Fabrication of nanocomposites by introduction of SiO2 metal oxide nanoparticles into a cobalt silicide thermoelectric matrix is studied. The CoSi matrix material was prepared through solid-state synthesis, and the nano-SiO2 ...
    • Article  

      Structural features of ball-milled nanostructured K2Bi 8Se13 thermoelectric material 

      Lioutas, C. B.; Hatzikraniotis, E.; Ioannou, M.; Paraskevopoulos, K. M.; Kyratsi, Theodora (2011)
      In this work, K2Bi8Se13 material was ball-milled in order to develop nanostructures through the modification of structural features. Structural changes during ball-milling were followed by powder X-ray diffraction measurements, ...
    • Article  

      Structural health monitoring under varying environmental conditions using wavelets 

      Tjirkallis, A.; Kyprianou, Andreas; Vessiaris, G. (2013)
      A novel structural health monitoring system to detect damages in structures under varying operational and environmental conditions is presented in this paper. A noncontact, full-field measurement using a high speed camera ...
    • Article  

      Structural modification based analysis and design of tuned mass dampers 

      Kyprianou, Andreas (2018)
      This article discusses the design of tuned vibration absorber for structures. A central notion in the identification of the parameters of a tuned mass damper (TMD) absorber for MDOF systems is that of modal mass of the ...
    • Article  

      Structural modification. Part 1: Rotational receptances 

      Mottershead, J. E.; Kyprianou, Andreas; Ouyang, H. (2005)
      The inverse problem of assigning natural frequencies and antiresonances by a modification to the stiffness, mass and damping of a structure is addressed. Very simple modifications such as the addition of masses and grounded ...
    • Article  

      Structural modification. Part 2: Assignment of natural frequencies and antiresonances by an added beam 

      Kyprianou, Andreas; Mottershead, J. E.; Ouyang, H. (2005)
      In this paper the inverse structural modification problem is solved in order to determine the dimensions of the cross-section of a beam that when added to an original structure will assign natural frequencies or antiresonances ...