Browsing Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering by Title
Now showing items 851-870 of 1036
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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 ...
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Article
Surface micro-roughness and transport properties of Si delta-doped GaAs/InxGa1-xAs/GaAs (0.1≤x≤0.25) quantum wells grown by molecular-beam epitaxy on GaAs (001) and GaAs (111)B
(1999)We investigated the surface quality and electron transport properties of 200 Å GaAs/InxGa1-xAs/GaAs, 0.1≤x≤0.25, quantum well structures grown by molecular-beam epitaxy on GaAs (001) and (111)B, center delta-doped with Si ...
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Article
Surface particularities in pulsed laser ablation/deposition of the ferromagnetic alloy NiMnSb
(2003)In this work we investigate the surface morphology and stoichiometry of the ablated targets employed with pulsed laser deposition (PLD) of thin films of the ferromagnetic half-Heusler alloy NiMnSb. The NiMnSb targets were: ...
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Article
Surface passivation and conversion of SnO2 to SnS2 nanowires
(2015)SnO2 nanowires have been grown on Si(0 0 1) via the vapour-liquid-solid mechanism at 800 °C and then exposed to H2S between 300 and 600 °C. The SnS2/SnO2 nanowires obtained at 300 °C consist of tetragonal rutile SnO2 and ...
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Article
Sustainable exploitation of mafic rock quarry waste for carbon sequestration following ball milling
(2018)Mineral carbonation has been proposed as a safe method for carbon capture and storage (CCS). Mafic lithologies are among the most promising rocks for mineral carbonation due to their high content in Ca, Fe and Mg-bearing ...
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Article
Symmetry of differential optical responses of normal and superconducting phases in single-crystal YBCO
(1995)We measured differential optical reflectivity (DOR) of YBCO single domains. DOR measurements reject the temperature independent bulk reflectivity and reveal dR dT. These measurements detect the superconducting transition, ...
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Article
Syntheses, crystal Structures and electronic Structures of new metal chalcoiodides Bi2CuSe3I and Bi6Cu3S10I
(2016)Two new metal chalcoiodides were synthesized by solid-state reactions at 400 °C. Crystal Data: Bi2CuSe3I, 1, monoclinic, C2/m, a=14.243(2) Å, b=4.1937(7) Å, c=14.647(2) Å, β=116.095(2)°, V=785.7(2) Å3, and Z=4
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Article
Synthesis and aqueous solution characterization of amphiphilic diblock copolymers containing carbazole
(2002)A series of near-monodisperse diblock copolymers of 2-(N-carbazolyl)ethyl methacrylate and 2-(dimethylamino)ethyl methacrylate (DMAEMA) of relatively low molecular weights (2600-24,000 g mol-1) were synthesized by group ...
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Article
Synthesis and characterization of Cr-B-N coatings deposited by reactive arc evaporation
(2008)Nanocomposite Cr-B-N coatings were deposited from CrB0.2 compound targets by reactive arc evaporation using an Ar/N2 discharge at 500 °C and -20 V substrate bias. Elastic recoil detection (ERDA), x-ray photoelectron ...