Browsing Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering by Title
Now showing items 188-207 of 1036
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Article
Direct numerical simulation of turbulent liquid metal flow entering a magnetic field
(2013)This paper presents direct numerical simulations (DNS) of fully developed turbulent liquid-metal flow in a circular duct entering a magnetic field. The case of a magnetohydrodynamic flow leaving a strong magnetic field has ...
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Article
Direct numerical simulations of Rayleigh–Bénard convection in water with non-Oberbeck–Boussinesq effects
(2019)Rayleigh–Bénard convection in water is studied by means of direct numerical simulations, taking into account the variation of properties. The simulations considered a three-dimensional (3-D) cavity with a square cross-section ...
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Conference Object
Direct observation of microscopic inhomogeneities in high-Tc superconductors using energy-dispersive diffraction of synchrotron-produced xrays
(Affiliation: Naval Research Lab., Washington, DC,, USA, United StatesCorrespondence Address: Skelton, Earl F.Naval Research Lab., Washington, DC,, USAUnited States, 1995)Evidence of micron-sized structural inhomogeneities in several high transition temperature (T c) superconductors is presented. By illuminating samples with high energy, highly collimated x rays produced on a synchrotron ...
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Article
Direct simulation of the limiting flux: I. Interpretation of the experimental results
(2009)Using a 2D fully coupled numerical model, the limiting flux phenomenon in the ultrafiltration of dextran was directly simulated assuming neither constant permeate velocity nor constant wall concentrations. It was found ...
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Article
Discrete multi-physics simulations of diffusive and convective mass transfer in boundary layers containing motile cilia in lungs
(2018)In this paper, the mass transfer coefficient (permeability) of boundary layers containing motile cilia is investigated by means of discrete multi-physics. The idea is to understand the main mechanisms of mass transport ...
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Article
Discrete multi-physics simulations of diffusive and convective mass transfer in boundary layers containing motile cilia in lungs
(2018)In this paper, the mass transfer coefficient (permeability) of boundary layers containing motile cilia is investigated by means of discrete multi-physics. The idea is to understand the main mechanisms of mass transport ...
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Article
A discussion regarding the approximation of cylindrical and spherical shaped samples as half spaces in AFM nanoindentation experiments
(2018)A common assumption of nanoidentation experiments is to consider the sample as an elastic half space due to the simplicity of the analysis regarding the Young’s modulus calculation. However, in the nano—dimensions a sample ...
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Article
Disorder-induced vortex phase transition in untwinned YBa2Cu3O7-δ crystal
(2000)Local magnetic measurements in an untwinned YBa2Cu3O7-δ crystal as a function of temperature, field and time reveal anomalies occurring along the same line BSS(T) in the field-temperature plane. We identify BSS(T) as a ...
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Article
Dispersed-phase structural anisotropy in homogeneous magnetohydrodynamic turbulence at low magnetic Reynolds number
(2008)A new tensor statistic, the dispersed-phase structure dimensionality Dp, is defined to describe the preferred orientation of clusters of discrete bodies. The evolution of Dp is calculated via direct numerical simulations ...
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Article
Dispersed-phase structure in sheared MHD turbulence
(2012)Direct numerical simulations are performed to examine particle dispersion in homogeneous turbulence subjected to mean shear and an externally applied magnetic field. We employ the Brucker et al. algorithm for simulating ...
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Conference Object
Disturbance attenuation of uncertain beams
(Katholieke Universiteit Leuven, 2008)In control theory disturbance attenuation is analyzed by the H8 theory and through certain dissipation inequalities. Even though this theory has been applied in controlling deterministic vibrating structures the control ...
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Conference Object
Doping and alloying trends in new thermoelectric materials
(Affiliation: Dept. of Elec. and Comp. Engineering, Michigan State University, East Lansing, MI, United StatesCorrespondence Address: Loo, S.Dept. of Elec. and Comp. Engineering, Michigan State University, East Lansing, MI, United States, 2002)New thermoelectric bulk materials such as CsBi4Te6 have shown superior properties to traditional materials, however, optimal performance requires continuing investigations of doping and alloying trends. A recently modified ...
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Article
Doping and Conductivity Limitations in Sb:SnO2 Nanowires Grown by the Vapor Liquid Solid Mechanism
(2018)Sb doped SnO2 nanowires have been grown via the vapor liquid solid mechanism on fused SiO2 at 800 °C and 1 mbar under a flow of Ar and O2 by using an excess of metallic Sb in conjunction with Sn. We obtain highly crystalline ...
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Conference Object
Doping studies of n-type CsBi4Te6 thermoelectric materials
(Affiliation: Dept of Electrical and Computer Eng., Northwestern University, Evanston, IL 60208, United StatesCorrespondence Address: Lane, M.A.Dept of Electrical and Computer Eng., Northwestern University, Evanston, IL 60208, United States, 2001)We have previously reported the successful p-type doping of CsBi4Te6 which had a high figure of merit at temperatures below 300 K. In this study, several dopants were explored to make n-type CsBi4Te6. A program of measurements ...
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Article
Dose-dependent artifact in the far wall of the carotid artery at dynamic contrast-enhanced US
(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 ...
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Conference Object
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Article
Double-networks based on pH-responsive, amphiphilic "core-first" star first polymer conetworks prepared by sequential RAFT polymerization
(2017)This manuscript presents the preparation and study of a new double-network hydrogel system, comprising an amphiphilic, pH-responsive first polymer conetwork synthesized via reversible addition-fragmentation chain transfer ...
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Article
Doxorubicin liposome-loaded microbubbles for contrast imaging and ultrasound-triggered drug delivery
(2013)Targeted drug delivery under image guidance is gaining more interest in the drug-delivery field. The use of microbubbles as contrast agents in diagnostic ultrasound provides new opportunities in noninvasive image-guided ...
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Article
Dynamic contrast enhanced ultrasound assessment of the vascular effects of novel therapeutics in early stage trials
(2012)Imaging is key in the accurate monitoring of response to cancer therapies targeting tumour vascularity to inhibit its growth and dissemination. Dynamic contrast enhanced ultrasound (DCE ultrasound) is a quantitative method ...
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Article