Πλοήγηση ανά Θέμα "Physics, Condensed Matter"
Αποτελέσματα 21-40 από 44
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The influence of Fe, Cu, Al-doping on the crystal structure, thermal and electrical properties of calcium titanate
(2008)CaTi(1-x)M(x)O(3-delta) (M=Fe, Al, Cu) samples were synthesized by the standard ceramic technology. The stability areas and the crystal structure of the solid solutions were determined by the X-ray Diffraction technique. ... -
Influence of nano-inclusions' grain boundaries on crack propagation modes in materials
(2011)The effect of nano-inclusions on materials strength and toughness has attracted great interest in recent years. It has been shown that tuning the morphological and microstructural features of materials can tailor their ... -
Influence of sintering additives of transition metals on the properties of gadolinium-doped barium cerate
(2008)In the present work the effect of MOx (where M =Cu, Ni, Zn, Fe, Co, Ti) addition on the densification behavior and electrical conductivity of BaCe(0.9)d(0.1)O(3-delta) ceramics is investigated. It was found that the small ... -
Investigation of the structural and electrical properties of Co-doped BaCe0.9Gd0.1O3-delta
(2011)In the present work the effect of cobalt oxide addition on the density and on the electrical properties of gadolinium-doped barium cerate is investigated. A series of BaCe0.9-xGd0.1CoxO3-delta (x = 0.00, 0.01, 0.03, 0.05, ... -
Methane Activation on a La(0.6)Sr(0.4)Co(0.8)Fe(0.2)O(3) Perovsksite; Catalytic and Electrocatalytic Results
(1997)The catalytic and electrocatalytic behaviour of the La(0.6)Sr(0.4)Co(0.8)Fe(0.2)O(3) (LSCF) perovskite deposited on yttria stabilized zirconia (YSZ), was studied during the reaction of methane oxidation. Experiments were ... -
Molecular dynamics simulation study of Ni2+ adatom diffusion on the NiO (001) surface
(2001)Using molecular dynamics simulations we studied the cation adatom diffusion on the NiO(001) surface. We found that there are two equilibrium adatom positions: one over an oxygen ion, that is raised by as much as 30% at ... -
Neutron diffraction on purple membranes - Essential water molecules in the light-driven proton pump bacteriorhodopsin
(1997)Neutron diffraction and time-resolved laser-spectroscopic experiments on the light-driven proton-pump bacterio-rhodopsin revealed the location of water molecules and their functional importance. About seven water molecules ... -
Ni3+ adsorbate dynamics on a NiO(001) surface
(2006)We present results concerning the dynamical behavior of a Ni3+ adsorbate on a NiO(001) surface obtained by molecular dynamics simulations. In a first place, we examined at low temperature the position of the Ni3+ ion as ... -
The oxidation of ethanol over Pt catalyst-electrodes deposited on ZrO2 (8 mol% Y2O3)
(2002)The reaction of ethanol oxidation has been examined over a Pt polycrystalline film deposited on an yttria-stabilized zirconia (YSZ) electrochemical reactor. Experiments were carried out between 300 and 350 degreesC at ... -
Oxygen adatom diffusion on the NiO(001) surface by molecular dynamics simulation
(2002)We present results concerning the diffusion processes of O2- adatom on the NiO(0 0 1) surface obtained by molecular dynamics simulations based on a rigid ion potential model. We covered a temperature region from 0.37T(m) ... -
Parameters Affecting Slip Length at the Nanoscale
(2013)We investigate liquid flows in various nanochannels and present the effect of all physical parameters affecting slip length at the boundary using molecular dynamics simulations. Our computational model shows that slip ... -
Performance of a SOFC fed by ethanol reforming products
(2002)Performance of a Pt based anode solid oxide fuel cell (SOFC) fed with a gas mixture containing H-2, CO and CH4 (molar ratio 1: 1: 1) produced by external ethanol decomposition was studied, Experiments were performed at ... -
Performance of a SOFC Powered with External Ethanol Steam Reforming
(2001)In the present study, a solid oxide fuel cell (SOFC) system was considered being fed by the equilibrium products of the steam reforming of ethanol. The thermodynamic analysis of ethanol steam reforming was undertaken at ... -
Pt-based anode catalysts for direct ethanol fuel cells
(2004)In the present work, several carbon supported PtSn and PtSnRu catalysts were prepared with different atomic ratios and tested in direct ethanol fuel cells (DEFC) operated at lower temperature (T=90 degreesC). XRD and TEM ... -
Pyrolytic laser-based chemical vapour deposition of TiC coatings
(1995)TiC layers have been successfully deposited locally on D2 tool steel specimens and miniature industrial tools with the aim to improve their mechanical and chemical surface properties. The deposition process was based on a ... -
Simple method for coating Si (100) surfaces with ferritin monolayers-Iron oxide quantum dots
(2011)With the goal to develop iron oxide quantum dots we developed a simple method to spread horse spleen ferritin monolayers on a Si (1 00) surface. Application of atomic force microscopy and spectroscopic ellipsometry showed ... -
The size effect of crystalline inclusions on the fracture modes in glass-ceramic materials
(2007)The main parameters influencing the mechanical performance of glass - ceramic materials are the shape and mean size of the ceramic phase, i. e. the crystalline inclusions. The aim of the present work is twofold: first, to ... -
Statistical-mechanical description of classical test-particle dynamics in the presence of an external force field: modelling noise and damping from first principles
(2006)Aiming to establish a rigorous link between macroscopic random motion (described e.g. by Langevin-type theories) and microscopic dynamics, we have undertaken a kinetic-theoretical study of the dynamics of a classical ... -
Structure and dynamics of NiO(001) and Ni/NiO(001) surfaces by molecular dynamics simulation
(2000)Using molecular dynamics and a rigid ion potential, we studied the vibrational and structural properties of the NiO(001) surface with and without cationic adatoms. We found that the bulk phonon density of states (DOS) is ... -
Synthesis and electrophysical properties of (1-x)Ce0.8Gd0.2O2-delta+xTiO(2) (x=0-0.06) solid-state solutions
(2008)In the present work the electrical properties of (1-x)Ce0.8Gd0.2O2-delta+xTiO(2) (x=0-0.06) synthesized by the standard ceramic technology were investigated, in a wide range of oxygen partial pressures (0.21-10(-20)atm at ...