Browsing Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering by Title
Now showing items 843-862 of 1036
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Article
Structure, mechanical and tribological properties of sputtered TiAlBN thin films
(1999)TiAlBN films were produced by simultaneously sputtering from TiAl and TiB2 targets in Ar/N2 mixtures at a substrate temperature of 150 °C. The goal of this investigation was to study the influence of the nitrogen content ...
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Article
Structure, mechanical and tribological properties of Ti-B-N and Ti-Al-B-N multiphase thin films produced by electron-beam evaporation
(1998)Titanium-based multiphase ceramic coatings were deposited by electron-beam plasma-assisted physical vapor deposition, evaporating mixtures of Ti, TiB2, and (Ti0.6Al0.4)B2.19N1.47 material in Ar or Ar/N2 plasmas. All exhibited ...
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Article
Structure, reactivity, luminescence and magnetism of dinuclear Ln 3+ complexes produced by the Ln3+-assisted hydrolysis of 3,6-bis(2-pyridyl)tetrazine
(2013)Twelve Pr3+, Sm3+, Eu3+, Gd3+, Tb3+ and Dy3+ complexes of N-(pyridin-2-ylmethylene) picolinohydrazonate (phzp-) were synthesized by the Ln3+ assisted hydrolysis of 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine. Crystallographic ...
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Article
A structure-based model for the transport of passive scalars in homogeneous turbulent flows
(2016)A structure-based model has been constructed, for the first time, for the study of passive scalar transport in turbulent flows. The scalar variance and the large-scale scalar gradient variance are proposed as the two ...
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Article
A structure-based model for transport in stably stratified homogeneous turbulent flows
(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 ...
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Article
Structure-based turbulence model: Application to a rotating pipe flow
(2002)A new approach for modeling the one-point turbulence statistics, which takes into account the information on turbulence structure, has been suggested in Kassinos and Reynolds (Report TF-61, Thermosciences Division, Department ...
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Article
Structure-based turbulence modeling for wall-bounded flows
(2000)The performance of Reynolds stress transport (RST) models in non-equilibrium flows is limited by the lack of information about two dynamically important effects: The role of energy-containing turbulence structure ...
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Article
Structure-Defined 3D Nanocomposite Polymer Networks: Versatile Heterogeneous Catalytic Platforms in Organic Synthesis
(2016)Colloidal polyvinylpyrrolidone-stabilized Pd nanoparticles were embedded within 1,2-bis(2-iodoethoxy)ethane (BIEE)-crosslinked poly(2-dimethylamino)ethyl methacrylate homopolymer networks with defined structural characteristics. ...
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Article
Students' use of the energy model to account for changes in physical systems
(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 ...
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Article
Studies of the tribological and mechanical properties of laminated CrC-SiC coatings produced by r.f. and d.c. sputtering
(1997)Multilayer CrC-SiC coatings were produced by both direct current and radio frequency sputtering of Cr and Si targets in an Ar-C2H2 atmosphere. Coatings of constant thickness of about 4 μm, but with the number of layers ...
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Article
A study of the nanostructure and hardness of electron beam evaporated TiAlBN Coatings
(2010)TiAlBN coatings have been deposited by electron beam (EB) evaporation from a single TiAlBN material source onto AISI 316 stainless steel substrates at a temperature of 450°C and substrate bias of −100V. The stoichiometry ...
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Article
Sulfur doping of M/In2O3 (M=Al,W) nanowires with room temperature near infra red emission
(2015)We have investigated the growth of Al doped In2O3 nanowires via the vapor-liquid-solid mechanism at 800°C using Au as a catalyst. We find that the Al is not incorporated into the cubic bixbyite crystal structure of In2O3 ...
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Article
Super-Resolution Contrast-Enhanced Ultrasound Methodology for the Identification of In Vivo Vascular Dynamics in 2D
(2019)Objectives The aim of this study was to provide an ultrasound-based super-resolution methodology that can be implemented using clinical 2-dimensional ultrasound equipment and standard contrast-enhanced ultrasound ...
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Article
Superconducting and magnetic properties of Fe-doped oxide superconductors
(1987)The superconducting and magnetic properties of the compounds La1.85Sr0.15Cu1-xFexO4 and YBa2(Cu1-xFex)3O7-y with 0<x<0.1 are presented. The Fe substitution in the La-Sr compound rapidly depresses Tc, extrapolating to Tc=0 ...
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Article
Superconducting and magnetic properties of the oxide superconductors La1.85Sr0.15Cu1-xFexO4
(1987)Mössbauer and magnetic measurements have been made in the perovskite superconductors La1.85Sr0.15Cu1-x57FexO4 for x=0.0025, 0.005, 0.01, 0.05 and 0.10. The superconducting transition temperature is rapidly depressed as x ...
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Article
Superhelices of poly[2-(acetoacetoxy)ethyl methacrylate]
(2004)Poly[2-(acetoacetoxy) ethyl methacrylate] (PAEMA) homopolymers were found to self-assemble into hierarchical superstructures, that is, double-stranded helical tubes of either screw sense (scanning force microscopy). Both ...
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Article
Superparamagnetic hybrid micelles, based on iron oxide nanoparticles and well-defined diblock copolymers possessing β-ketoester functionalities
(2009)The quality of surface coating of magnetic nanoparticles destined as nanoprobes in clinical applications is of utmost significance for their colloidal stability and biocompatibility. A novel approach for the fabrication ...
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Conference Object
Superparamagnetic nanocomposite PEO/PLLA-based fibrous membranes: Synthesis, characterization and evaluation in drug release applications
(Elsevier Ltd, 2012)
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Article
Surface and interface study of pulsed-laser-deposited off-stoichiometric NiMnSb thin films on a Si(100) substrate
(2006)We report a detailed study of surface and interface properties of pulsed-laser-deposited NiMnSb films on a Si(100) substrate as a function of film thickness. As the thickness of films is reduced below 35 nm, formation of ...
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Article
Surface effects in layered semiconductors Bi2Se3 and Bi2Te3
(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 ...