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

Now showing items 481-500 of 1036

    • Article  

      The ASBM-SA turbulence closure: Taking advantage of structure-based modeling in current engineering CFD codes 

      Panagiotou, C. F.; Kassinos, Stavros C.; Aupoix, B. (2015)
      Structure-based turbulence models (SBM) carry information about the turbulence structure that is needed for the prediction of complex non-equilibrium flows. SBM have been successfully used to predict a number of canonical ...
    • Article  

      A structure-based model for transport in stably stratified homogeneous turbulent flows 

      Panagiotou, C. F.; Kassinos, Stavros C. (2017)
      We present an extension that allows a recently proposed structure-based model for turbulent scalar transport to account for buoyancy effects. The proposed model is based on a generalization of the Interactive Particle ...
    • Article  

      An analysis of laminar fluid flow in porous tube and shell systems 

      Pangrle, B. J.; Alexandrou, Andreas N.; Dixon, A. G.; Dibiasio, D. (1991)
      The finite element method was used to study steady, incompressible, laminar flow in porous tube systems. The Navier-Stokes equations were used to describe the flow phenomena in the tube and shell space while the continuum ...
    • Article  

      Computation of complex terrain turbulent flows using hybrid algebraic structure-based models (ASBM) and LES 

      Panagiotou, C.; Kassinos, Stavros C.; Grigoriadis, D. G. E. (2016)
      In this work, we revisit the coupling of the Algebraic Structure-Based Model with popular two-equation eddy viscosity models (EVM). We consider both the v2 − f model and variants of the κ-ω model. Our aim is to explore the ...
    • Article  

      Students' use of the energy model to account for changes in physical systems 

      Papadouris, N.; Constantinou, C. P.; Kyratsi, Theodora (2008)
      The aim of this study is to explore the ways in which students, aged 11-14 years, account for certain changes in physical systems and the extent to which they draw on an energy model as a common framework for explaining ...
    • Conference Object  

      Uniaxial and biaxial mechanical behavior of human amnion 

      Barocas, V. Η; Oyen, M. L.; Stylianopoulos, T.; Calvin, S. E.; Cook, R. F. (Affiliation: Department of Biophysical Sciences and Medical Physics, University of Minnesota, Minneapolis, MN 55455, United StatesAffiliation: Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, United StatesAffiliation: Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, United StatesAffiliation: Department of Obstetrics, Gynecology and Women's Health, University of Minnesota, Minneapolis, MN 55455, United StatesAffiliation: Minnesota Perinatal Physicians/Allina Health System, Minneapolis, MN 55407, United StatesCorrespondence Address: Oyen, M.L.Department of Biophysical Sciences and Medical Physics, University of Minnesota, Minneapolis, MN 55455, United States, 2005)
      Chorioamnion, the membrane surrounding a fetus during gestation (the "amniotic sac"), is a structural soft tissue for which the mechanical behavior is poorly understood-despite its critical role in maintaining a successful ...
    • Article  

      Femtosecond carrier dynamics in In 2O 3 nanocrystals 

      Othonos, A.; Zervos, Matthew; Tsokkou, D. (2009)
      We have studied carrier dynamics in In 2O 3 nanocrystals grown on a quartz substrate using chemical vapor deposition. Transient differential absorption measurements have been employed to investigate the relaxation dynamics ...
    • Article  

      Tin oxide nanowires: The influence of trap states on ultrafast carrier relaxation 

      Othonos, A.; Zervos, Matthew; Tsokkou, D. (2009)
      We have studied the optical properties and carrier dynamics in SnO 2 nanowires (NWs) with an average radius of 50 nm that were grown via the vapor-liquid solid method. Transient differential absorption measurements have ...
    • Article  

      A systematic investigation into the conversion of Β-Ga 2O3 to GaN nanowires using NH3 and H 2: Effects on the photoluminescence properties 

      Othonos, A.; Zervos, Matthew; Christofides, C. (2010)
      GaN nanowires (NWs) with a hexagonal wurtzite crystal structure, diameters of 50 nm and lengths of 10 μm have been obtained from postgrowth nitridation of monoclinic Β-Ga2O3 NWs using NH3 between 700-1090 °C. The conversion ...
    • Article  

      Ultrafast Spectroscopy and Red Emission from β-Ga2O3/β-Ga2S3 Nanowires 

      Othonos, K. M.; Zervos, Matthew; Christofides, C.; Othonos, A. (2015)
      Ultrafast pump-probe and transient photoluminescence spectroscopy were used to investigate carrier dynamics in β-Ga2O3 nanowires converted to β-Ga2O3/Ga2S3 under H2S between 400 to 600 °C. The β-Ga2O3 nanowires exhibited ...
    • Article  

      Ultrafast carrier relaxation in inn nanowires grown by reactive vapor transport 

      Othonos, A.; Zervos, Matthew; Pervolaraki, M. (2009)
      We have studied femtosecond carrier dynamics in InN nanowires grown by reactive vapor transport. Transient differential absorption measurements have been employed to investigate the relaxation dynamics of photogenerated ...
    • Article  

      Optical probing of anisotropic heat transport in the quantum spin ladder Ca 9La 5Cu 24O 41 

      Otter, M.; Athanasopoulos, G.; Hlubek, N.; Montagnese, M.; Labois, M.; Fishman, D. A.; Haan, F. De; Singh, S.; Lakehal, D.; Giapintzakis, John; Hess, C.; Revcolevschi, A.; Loosdrecht, P. H. M. Van (2012)
      A transient thermal imaging technique is used to monitor heat diffusion at the surface of the antiferromagnetic spin ladder material Ca 9La 5Cu 24O 41. This material shows highly anisotropic thermal conductivity due to a ...
    • Article  

      Uniaxial and biaxial mechanical behavior of human amnion 

      Barocas, V. Η; Oyen, M. L.; Cook, R. F.; Stylianopoulos, T.; Calvin, S. E.; Landers, D. V. (2005)
      Chorioamnion, the membrane surrounding a fetus during gestation, is a structural soft tissue critical for maintaining a successful pregnancy and delivery. However, the mechanical behavior of this tissue membrane is poorly ...
    • Conference Object  

      In vitro prefailure mechanics of placental membranes 

      Barocas, V. Η; Oyen, M. L. L.; Stylianopoulos, T.; Calvin, S. E.; Landers, D. V. (Affiliation: Department of Obstetrics, Gynecology, and Women's Health, University of Minnesota, Minneapolis, MN, United StatesAffiliation: Department of Chemical Engineering, University of Minnesota, Minneapolis, MN, United StatesAffiliation: Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, United StatesCorrespondence Address: Oyen, M.L.L.Department of Obstetrics, Gynecology, and Women's Health, University of Minnesota, Minneapolis, MN, United States, 2005)
    • Article  

      Ultrafast hole carrier relaxation dynamics in p-type CuO nanowires 

      Othonos, A.; Zervos, Matthew (2011)
      Ultrafast hole carrier relaxation dynamics in CuO nanowires have been investigated using transient absorption spectroscopy. Following femtosecond pulse excitation in a non-collinear pump-probe configuration, a combination ...
    • Article  

      Carrier dynamics in Β-Ga2O3 nanowires 

      Othonos, A.; Zervos, Matthew; Christofides, C. (2010)
      Carrier dynamics have been investigated in Β-Ga2O 3 nanowires (NWs) grown by the vapor-liquid-solid mechanism, using ultrashort transient absorption spectroscopy in conjunction with time-correlating single photon counting ...
    • Article  

      Heat channeling in extremely thin silicon-on-insulator devices: A simulation study 

      Orfanidou, C. M.; Giapintzakis, John (2013)
      Silicon-on-insulator (SoI) devices are particularly interesting for thermal management studies as they suffer from severe self-heating because of the very low and isotropic thermal conductivity of silicon dioxide that is ...
    • Article  

      Carrier dynamics in InS nanowires grown via chemical vapor deposition 

      Othonos, A.; Zervos, Matthew (2010)
      Transient femtosecond absorption spectroscopy and timecorrelating single photon counting (TCSPC) photoluminescence (PL) were employed to study InS nanowires (NWs) grown by chemical vapor deposition (CVD) and determine the ...
    • Article  

      Targeted Drug Delivery to Upper Airways Using a Pulsed Aerosol Bolus and Inhaled Volume Tracking Method 

      Ostrovski, Y.; Dorfman, S.; Mezhericher, M.; Kassinos, Stavros C.; Sznitman, J. (2018)
      The pulmonary route presents an attractive delivery pathway for topical treatment of lung diseases. While significant progress has been achieved in understanding the physical underpinnings of aerosol deposition in the ...
    • Article  

      Carrier relaxation dynamics in SnxNy nanowires grown by chemical vapor deposition 

      Othonos, A.; Zervos, Matthew (2009)
      Carrier relaxation dynamics in tin nitride (SnxNy) nanowires have been investigated using femtosecond transient absorption spectroscopy. The nanowires were grown directly on quartz using chemical vapor deposition and had ...