Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering: Recent submissions
Now showing items 321-340 of 1036
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Article
Thermoelectric properties of Mg2Si coatings deposited by pack cementation assisted process on heavily doped Si substrates
(2014)This work presents a study of structural and thermoelectric properties of Mg2Si coatings deposited on heavily doped p- and n-type Si substrates, at 650 C. The as-grown layers were smooth and uniform in thickness without ...
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Macro and Micro-Scale Features of Thermoelectric PbTe (Br, Na) Systems: Micro-FTIR Spectroscopy, Micro-Seebeck Measurements, and SEM/EDX Observations
(2014)In this work, n-type and p-type PbTe doped with Br and Na, respectively, were thoroughly examined to determine the effect of the dopant on microstructure. Macro and micro homogeneity of the samples were studied by means ...
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Article
Inhomogeneities and Effective Mass in Doped Mg2Si
(2016)Magnesium silicide (Mg2Si)-based materials are promising candidates as thermoelectric components for mid-temperature range (500–900 K) energy conversion. Many different approaches for determining the parabolicity of the ...
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Article
Experimental determination of the absolute temperature modulation in photothermal microscopy of Y1Ba2Cu3O7 crystals
(1997)We present a technique to experimentally determine the value of the temperature perturbation ST in photothermal microscopy. Knowledge of δT is necessary for proper analysis of the differential optical reflectivity (∂R/∂T) ...
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Progress in photothermal microscopy of YBa2Cu3O7-x
(1998)We present recent differential optical reflectivity (DOR) measurements obtained at 633 nm (2.OeV), 780 nm (1.6eV), 1064 nm (1.16eV), and 1310nm (0.95 eV). We discuss calibration techniques which can correct for variations ...
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Article
Layered atomic structures of double oxides for low shear strength at high temperatures
(2010)Double oxide phases combining a transition metal and a noble metal have recently become a subject of investigation as solid lubricant materials for high-temperature tribological applications. Here, we study the changes in ...
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Article
Physical system modeling
(2010)
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Article
Indicator Dilution Models for the Quantification of Microvascular Blood Flow With Bolus Administration of Ultrasound Contrast Agents
(2010)Indicator dilution methods have a long history in the quantification of both macro- and microvascular blood flow in many clinical applications. Various models have been employed in the past to isolate the primary pass of ...
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Article
Atemplate-based modeling approach for system design: Theory and implementation
(1996)Previous research has developed search algorithms for deducing Proper Models (minimum complexity models with physically meaningful parameters) of dynamic systems. It has also been proposed that these Proper Models can be ...
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Article
Structure and Magnetic Property Control of Copper Hydroxide Acetate by Non-Classical Crystallization
(2017)Copper hydroxide acetate (CHA), one layered hydroxide compound with tunable magnetism, attracts great interest because of its potential applications in memory devices. However, ferromagnetism for CHA is only demonstrated ...
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Article
Vehicle model robustness: A case study of the FMTV military truck model
(2005)Vital to the effectiveness of simulation-based design is having a model of known quality of the system being designed. The purpose of this paper is to validate a simplified dynamic model of an FMTV (Family of Medium Tactical ...
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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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Conference Object
Determining model accuracy as a function of inputs and system parameters
(American Society of Mechanical Engineers (ASME), 2004)Vital to the effectiveness of simulation-based design is having a system model of known quality. Previous research introduced an algorithm called AVASIM for assessing model validity systematically and quantitatively. AVASIM ...
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Article
Design, assembly and characterization of silicide-based thermoelectric modules
(2016)Silicides have attracted considerable attention for use in thermoelectric generators due mainly to low cost, low toxicity and light weight, in contrast to conventional materials such as bismuth and lead telluride. Most ...
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Article
Effect of gold and silver nanoislands on the electrochemical properties of carbon nanofoam
(2013)•Metallic nanoislands coated on the exterior surface of carbon nanofoam.•Their properties are dependent on the type of the metallic nanoisland.•The gold-associated redox reactions enhance their electrochemical performance.
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Article
Broom-like and flower-like heterostructures of silver molybdate through pH controlled self assembly
(2012)Silver molybdate microrods are selfassembled into micron sized, broom-like and flowerlike structures. Our investigations indicate that through a simple hydrothermal process, large scale production of such structure is ...
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Article
Residual Doping Effects on the Amplitude of Polarization-Induced Electric fields in GaN/AlGaN Quantum Wells
(2001)We show that residual doping and carrier distribution effects decrease the observed polarization-induced electric fields in GaN/AlGaN quantum wells and that these effects ought to be considered if we want to compare in a ...
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Article
Room temperature synthesis and high temperature frictional study of silver vanadate nanorods
(2010)We report the room temperature (RT) synthesis of silver vanadate nanorods (consisting of mainly β-AgVO3) by a simple wet chemical route and their frictional study at high temperatures (HT). The sudden mixing of ammonium ...
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Article
Techniques for Perfusion Imaging with Microbubble Contrast Agents
(2001)Deals with a study which introduced a common methodology, based directly upon the measured or modeled properties of agent and tissue, whereby Doppler and radio frequency (RF) filters for perfusion imaging can be optimized. ...
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Conference Object
An Algorithm for the Selection of Physical System Model Order Based on Desired State Accuracy and Computational Efficiency
(American Society of Mechanical Engineers (ASME), 2003)In recent years, algorithms have been developed to help automate the production of dynamic system models, The focus of this development has been to create procedures and algorithms that use modeling metrics for generating ...