Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering: Recent submissions
Now showing items 861-880 of 1036
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Article
Optical studies of the a-, b-, and c-axis charge dynamics in YBa2Cu3O6+x
(1993)Optical and Raman-scattering studies of a-, b-, and c-axis YBa2Cu3O6+x between 0.025 and 5.5 eV are presented as a function of doping, and compared to the results of Bi2Sr2CaCu2O8 and La2-xSrxCuO4. Our doping-dependence ...
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Article
Vortex-motion-induced voltage noise in YBa2Cu3O7- single crystals
(1995)We have investigated vortex motion below the quasistatic melting transition in a detwinned YBa2Cu3O7- single crystal by measuring the differential resistance and the voltage noise. With the magnetic field parallel to the ...
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Article
Microstructure and nanomechanical properties of pulsed excimer laser deposited DLC:Ag films: Enhanced nanotribological response
(2017)Diamond-like carbon:silver (DLC:Ag) thin films, with metal contents as high as 16.8 at.%, have been deposited on silicon substrates using pulsed excimer laser deposition
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Conference Object
Hardware acceleration of n-body simulations for galactic dynamics
(Affiliation: Rutgers Univ., Piscataway, NJ, USA, United StatesCorrespondence Address: Cook, Todd A.Rutgers Univ., Piscataway, NJ, USAUnited States, 1995)N-body methods are used to simulate the evolution and interaction of galaxies. These simulations are usually run on large-scale supercomputers or on very expensive full-custom hardare. This paper presents an alternative ...
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Conference Object
Effects of periodic gravity modulation in microgravity convection systems
(Publ by ASME, 1993)Natural convection in an enclosure that is subjected to periodic excitations is investigated using a classical mixed Galerkin finite element method. The modulation is incorporated in the momentum equations, through a ...
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Article
Development of the optical conductivity with doping in single-domain YBa2Cu3O6+x
(1992)Optical studies of single-domain crystals of YBa2Cu3O6+x allow us to separate the CuO2-plane and CuO-chain contributions to the optical conductivity as a function of doping between 0.025 and 5.5 eV. We find several interesting ...
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Article
Structural Modifications Induced by Sodium Doping in PbTe Thermoelectric Materials Prepared by Low Temperature Synthesis
(2014)In the current study, the effect of a Low Temperature Synthesis (LTS) and sodium doping on the structural properties of PbTe materials is investigated using high resolution transmission electron microscopy and image analysis ...
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Semi-interpenetrating polymer networks with predefined architecture for metal ion fluorescence monitoring
(2016)The development of new synthetic approaches for the preparation of efficient 3D luminescent chemosensors for transition metal ions receives considerable attention nowadays, owing to the key role of the latter as elements ...
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Article
Improvement of the accuracy of liver lesion DCEUS quantification with the use of automatic respiratory gating
(2016)Objectives: To evaluate the efficiency of automatic respiratory gating (ARG) in reducing respiratory motion-induced artefacts from dynamic contrast-enhanced ultrasound (DCEUS) acquisitions and to assess the impact of ARG ...
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Crystal/glass phase change in KSb5S8 studied through thermal analysis techniques
(2004)The reversible crystal-glass and glass-crystal transitions discovered in KSb5S8 were studied in detail with nonisothermal scanning calorimetry techniques. When cooled, molten KSb5S8 becomes a metastable glass, which can ...
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Automatic respiratory gating for contrast ultrasound evaluation of liver lesions
(2014)Dynamic contrast-enhanced ultrasound (DCEUS) has been used in radiology for many years for lesion detection and characterization. In recent years, more emphasis has been placed on tumor perfusion quantification with DCEUS. ...
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Article
Thermal conduction in magnetized turbulent gas
(2003)Using numerical methods, we systematically study in the framework of ideal MHD the effect of magnetic fields on heat transfer within a turbulent gas. We measure the rates of passive scalar diffusion within magnetized fluids ...
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Article
Automatic respiratory gating for perfusion quantification of DCEUS
(2013)A novel automatic respiratory gating (ARG) algorithm for ultrasound is presented. The ARG algorithm was applied on dual contrast imaging (contrast/tissue) loops in order to remove respiratory motion artifacts from dynamic ...
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Article
Evaluation of the Accuracy of Liver Lesion DCEUS Quantification With Respiratory Gating
(2016)Confidence in the accuracy of dynamic contrast enhanced ultrasound (DCEUS) quantification parameters is imperative for the correct diagnosis of liver lesion perfusion characteristics. An important source of uncertainty in ...
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Article
A Prototype Device for 3D Regional, Passive Elasticity Measurements of the Murine Myocardium Using AFM
(2016)This study presents the design and implementation of a prototype device that interfaces with commercial atomic force microscopy (AFM) instruments to accurately measure ex vivo, regional, passive elasticity measurements of ...
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Article
Angiotensin inhibition enhances drug delivery and potentiates chemotherapy by decompressing tumour blood vessels
(2013)Cancer and stromal cells actively exert physical forces (solid stress) to compress tumour blood vessels, thus reducing vascular perfusion. Tumour interstitial matrix also contributes to solid stress, with hyaluronan ...
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Article
Delivery of molecular and nanoscale medicine to tumors: Transport barriers and strategies
(2011)Tumors are similar to organs, with unique physiology giving rise to an unusual set of transport barriers to drug delivery. Cancer therapy is limited by nonuniform drug delivery via blood vessels, inhomogeneous drug transport ...
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Article
Normalization of tumour blood vessels improves the delivery of nanomedicines in a size-dependent manner
(2012)The blood vessels of cancerous tumours are leaky and poorly organized. This can increase the interstitial fluid pressure inside tumours and reduce blood supply to them, which impairs drug delivery. Anti-angiogenic ...
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Article
Wall shear rates in circular couette flow of a Herschel-Bulkley fluid
(2009)The objective of this work is to study quantitatively the errors introduced by the standard Newtonian and power-law assumptions used in the determination of the material properties of viscoplastic fluids from circular ...