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

Now showing items 261-280 of 1036

    • Conference Object  

      Transient flow characteristics and properties of semi-solid aluminum alloy A356 

      Tonmukayakul, N.; Pan, Q. Y.; Alexandrou, Andreas N.; Apelian, D. (Affiliation: Advance Casting Research Center, Metal Processing Institute, WPI, Worcester, MA 01609, United StatesAffiliation: Department of Mechanical and Industrial Engineering, University of Cyprus, P.O. Box 20537, 1678 Nicosia, CyprusCorrespondence Address: Tonmukayakul, N.Advance Casting Research Center, Metal Processing Institute, WPI, Worcester, MA 01609, United States, 2004)
      Development of numerical models to simulate flow characteristics of semi-solid metals in the die cavity requires a good understanding of the transient and equilibrium flow properties of semi-solids and knowledge of the ...
    • Article  

      Carrier dynamics and conductivity of SnO 2 nanowires investigated by time-resolved terahertz spectroscopy 

      Tsokkou, D.; Othonos, A.; Zervos, Matthew (2012)
      THz spectroscopy has been applied to investigate the photo-induced and intrinsic conductivity in SnO 2 nanowires using the Drude-Smith model. The refractive index of the nanowires was found to decrease from 2.4 to 2.1 with ...
    • Article  

      Dose-dependent artifact in the far wall of the carotid artery at dynamic contrast-enhanced US 

      Thapar, A.; Shalhoub, J.; AVERKIOU, MICHALAKIS A.; Mannaris, C.; Davies, A. H.; Leen, E. L.; Thapar, Ankur; Shalhoub, Joseph; AVERKIOU, MICHALAKIS A.; Mannaris, Christophoros; Davies, A. H.; Leen, Edward L. S. (2012)
      Purpose: To quantify a pseudoenhancement phenomenon observed during dynamic contrast material-enhanced ultrasonography (US) of the carotid artery, both in vitro and in vivo.Materials and Methods: Ethical approval was ...
    • Conference Object  

      Thermoelectric properties of pressed pellets and pressureless sintering in the K2Bi8Se13-xSx system 

      Tsiappos, A.; Kyratsi, Theodora; Kanatzidis, M. G. (Affiliation: Department of Mechanical and Manufacturing Engineering, School of Engineering, University of Cyprus, Nicosia, CyprusAffiliation: Department of Chemistry, Michigan State University, East Lansing, MI 48824, United StatesCorrespondence Address: Tsiappos, A.Department of Mechanical and Manufacturing Engineering, School of Engineering, University of Cyprus, Nicosia, Cyprus, 2006)
      The solid solutions of ß-K2Bi8Se13 are an interesting series of materials for thermoelectric investigations because they possess very low thermal conductivity and relatively high power factor. Moreover, the sulfur-substituted ...
    • Conference Object  

      Mechanical alloying synthesis of K2Bi8Se 13- type solid solutions 

      Toumpas, N.; Kyratsi, Theodora; Hatzikraniotis, E.; Tsiappos, A.; Pavlidou, E.; Paraskevopoulos, K. M.; Chung, D. Y.; Kanatzidis, M. G. (Affiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, 1678, CyprusAffiliation: Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, 54124, GreeceAffiliation: Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, United StatesAffiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208, United StatesCorrespondence Address: Toumpas, N.Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, 1678, Cyprus, 2008)
      Solid solutions of β-K2Bi8-xSb xSe13 are an interesting series of materials for thermoelectric investigations due to their very low thermal conductivity and highly anisotropic electrical properties. In this work, we aimed ...
    • Article  

      Vanadium(IV) - Citrate complex interconversions in aqueous solutions. A pH-dependent synthetic, structural, spectroscopic, and magnetic study 

      Tsaramyrsi, M.; Kaliva, M.; Salifoglou, A.; Raptopoulou, C. P.; Terzis, A.; Tangoulis, V.; Giapintzakis, John (2001)
      Citrate is abundantly encountered in biological fluids as a natural metal ion chelator. Vanadium participates in biological processes as a catalyst in the active sites of metalloenzymes, as a metabolic regulator, as a ...
    • Article  

      Damage detection under varying environmental and operational conditions using Wavelet Transform Modulus Maxima decay lines similarity 

      Tjirkallis, A.; Kyprianou, Andreas (2016)
      Over the last three decades, there have been increasing demands to develop and deploy Structural Health Monitoring (SHM) systems for engineering structures in service. Since these structures are subjected to varying ...
    • Article  

      Three different types of quasi-model networks: Synthesis by group transfer polymerization and characterization 

      Triftaridou, A. I.; Kafouris, D.; Vamvakaki, M.; Georgiou, T. K.; Krasia-Christoforou, T.; Themistou, E.; Hadjiantoniou, N.; Patrickios, C. S. (2007)
      Group transfer polymerization (GTP) chemistry was employed for the preparation of polymethacrylate networks of controlled structure (quasi-model networks) of three different types: (a) regular quasi-model networks, in which ...
    • 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  

      Thermal conductivity and degradation behavior of HDPE/graphene nanocomposites: Pyrolysis, kinetics and mechanism 

      Tarani, E.; Terzopoulou, Z.; Bikiaris, D. N.; Kyratsi, Theodora; Chrissafis, K.; Vourlias, G. (2017)
      Graphene-filled high-density polyethylene nanocomposites varying filler’s size (5, 10 and 25 × 10−6 m in diameter) were prepared by the melt-mixing method, and their thermal properties are then investigated by TG, Py–GC/MS ...
    • Article  

      Data storage applications based on LiCoO2 thin films grown on Al2O3 and Si substrates 

      Svoukis, E.; Mihailescu, C. N.; Mai, V. H.; Schneegans, O.; Breza, K.; Lioutas, C.; Giapintzakis, John (2015)
      In this study, LiCoO2 thin films were investigated for data storage applications based on scanning probe mediated approaches. LiCoO2, compared to other materials proposed for scanning probe mediated nanoscale patterning, ...
    • Article  

      Solution of the square lid-driven cavity flow of a Bingham plastic using the finite volume method 

      Syrakos, A.; Georgiou, G. C.; Alexandrou, Andreas N. (2013)
      We investigate the performance of the finite volume method in solving viscoplastic flows. The creeping square lid-driven cavity flow of a Bingham plastic is chosen as the test case and the constitutive equation is regularised ...
    • Article  

      Thermoelectric properties of Bi0.5Sb1.5Te3 thin films grown by pulsed laser deposition 

      Symeou, E.; Pervolaraki, M.; Mihailescu, C. N.; Athanasopoulos, G. I.; Papageorgiou, C.; Kyratsi, Theodora; Giapintzakis, John (2015)
      We report on the pulsed laser deposition of p-type Bi0.5Sb1.5Te3 thin films onto fused silica substrates by ablation of dense targets of Bi0.5Sb1.5Te3 with an excess of 1 wt% Te. We investigated the effect of film thickness, ...
    • Conference Object  

      Solution of viscoplastic flows with the finite volume / multigrid method 

      Syrakos, A.; Georgiou, G. C.; Alexandrou, Andreas N. (National Technical University of Athens, 2013)
      We investigate the performance of the finite volume method in solving viscoplastic flows. The square lid-driven cavity flow of a Bingham plastic is chosen as the test case and the constitutive equation is regularised as ...
    • Article  

      Performance of the finite volume method in solving regularised Bingham flows: Inertia effects in the lid-driven cavity flow 

      Syrakos, A.; Georgiou, G. C.; Alexandrou, Andreas N. (2014)
      We extend our recent work on the creeping flow of a Bingham fluid in a lid-driven cavity, to the study of inertial effects, using a finite volume method and the Papanastasiou regularisation of the Bingham constitutive model ...
    • Article  

      Thixotropic flow past a cylinder 

      Syrakos, A.; Georgiou, G. C.; Alexandrou, Andreas N. (2014)
      We study the flow of a thixotropic fluid around a cylinder. The rheology of the fluid is described by means of a structural viscoplastic model based on the Bingham constitutive equation, regularised using the Papanastasiou ...
    • Article  

      A two-dimensional numerical study of the stick-slip extrusion instability 

      Taliadorou, E.; Georgiou, G. C.; Alexandrou, Andreas N. (2007)
      The time-dependent, compressible extrusion of a Carreau fluid is solved over the reservoir-die-extrudate region using finite elements in space and a fully implicit scheme in time. A nonmonotonic slip law based on experimental ...
    • Article  

      Cessation of the lid-driven cavity flow of Newtonian and Bingham fluids 

      Syrakos, A.; Georgiou, G. C.; Alexandrou, Andreas N. (2016)
      We provide benchmark results for a transient variant of the lid-driven cavity problem, where the lid motion is suddenly stopped and the flow is left to decay under the action of viscosity. Results include Newtonian as well ...
    • Article  

      Growth and transport properties of HT-Li xCoO 2 thin films deposited by pulsed laser deposition 

      Svoukis, E.; Athanasopoulos, G. I.; Moradpour, A.; Schneegans, O.; Revcolevschi, A.; Giapintzakis, John (2012)
      The successful in situ growth of single phase, c-axis oriented, layered structured Li xCoO 2 thin films on (0 0 0 1) Al 2O 3 substrates by pulsed laser deposition is reported. Thin films were grown in an oxygen pressure ...
    • Article  

      Analyzing a turbulent pipe flow via the one-point structure tensors: Vorticity crawlers and streak shadows 

      Stylianou, F. S.; Pecnik, R.; Kassinos, Stavros C. (2016)
      Efforts to identify and visualize near-wall structures typically focus on the region y+≳5, where large-scale structures with significant turbulent kinetic energy content reside, such as the high-speed and low-speed streaks ...