scholarly journals Modelling of Oxygen Diffusion and Segregation at Interfaces in Ag-MgO Composites

2007 ◽  
Vol 266 ◽  
pp. 29-38
Author(s):  
Irina V. Belova ◽  
Andreas Öchsner ◽  
Nilindu Muthubandara ◽  
Graeme E. Murch
Keyword(s):  
Oxygen Diffusion ◽  
Atomic Oxygen ◽  
Composite System ◽  
Point Of View ◽  
Model Composite ◽  
Oxide Interfaces ◽  
Bulk Properties ◽  
Metal Ceramic ◽  
Phenomenological Point ◽  
Good Agreement

The presence of atomic oxygen at internal metal-ceramic oxide interfaces significantly affects the physical properties of the interfaces which in turn affects the bulk properties of the material. This problem is addressed for the model composite system Ag-MgO from a phenomenological point of view using a lattice-based Monte Carlo method and a finite element method extended with special user-subroutines. We simulate the time dependence of oxygen depth and contour profiles. We are able to show very good agreement between these two methods.

scholarly journals Finite Element Modelling of Oxygen Diffusion and Segregation at Interfaces in Ag-MgO Composites: Parametric Studies

2008 ◽  
Vol 273-276 ◽  
pp. 461-466
Author(s):  
Andreas Öchsner ◽  
Irina V. Belova ◽  
Graeme E. Murch
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Atomic Oxygen ◽  
Model System ◽  
Point Of View ◽  
The Finite Element Method ◽  
Oxide Interfaces ◽  
Bulk Properties ◽  
Metal Ceramic ◽  
Parametric Studies

The presence of atomic oxygen at internal metal-ceramic oxide interfaces signifi- cantly affects the physical properties of the interfaces which in turn affects the bulk properties of the material. This problem is addressed for the model system Ag-MgO from a phenomenolog- ical point of view using the finite element method. The performed parametric studies investigate the influence of different kinetic parameters of the diffusion-segregation system.

On some Conceptual Considerations for the Finite Element Simulation of the Oxygen Out-Diffusion in Ag-MgO Composites

2009 ◽  
Vol 283-286 ◽  
pp. 1-5
Author(s):  
Andreas Öchsner
Keyword(s):  
Finite Element ◽  
Physical Properties ◽  
Atomic Oxygen ◽  
Oxide Interfaces ◽  
Bulk Properties ◽  
Nite Element ◽  
Element Simulation ◽  
Metal Ceramic ◽  
Numerical Tools ◽  
The Right

The presence of atomic oxygen at internal metal-ceramic oxide interfaces signi¯- cantly affects the physical properties of the interfaces which in turn affects the bulk properties of the material. The application of numerical tools such as the ¯nite element method requires some conceptional considerations if results from different finite element meshes of methods should be comparable. This paper summarises some of these thoughts in order to provide the right basis for comparative investigations.

Analysis of Oxygen Segregation at Metal-Oxide Interfaces Using a New Lattice Monte Carlo Method

2007 ◽  
Vol 129 ◽  
pp. 111-117 ◽  
Author(s):  
Irina V. Belova ◽  
Graeme E. Murch ◽  
Nilindu Muthubandara ◽  
Andreas Öchsner
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Physical Properties ◽  
Atomic Oxygen ◽  
Oxide Interfaces ◽  
Bulk Properties ◽  
Ceramic Oxide ◽  
Lattice Monte Carlo ◽  
Metal Ceramic ◽  
Constant Source

The presence of atomic oxygen at internal metal-ceramic oxide interfaces significantly affects the physical properties of the interfaces which in turn affects the bulk properties of the material. We address this problem for the case of a constant source of oxygen at the surface and periodic arrangements of ceramic oxide (MgO) inclusions embedded in a metal (Ag) matrix. We simulate the time-dependence of the oxygen concentration into the material using a newly developed lattice Monte Carlo method that takes into account a constant source of diffusant.

Subjectivity as a sentient perspective and the role of interoception

2018 ◽  
Author(s):  
Helena De Preester
Keyword(s):  
Crucial Role ◽  
Point Of View ◽  
Basic Form ◽  
Bodily States ◽  
The Brain ◽  
Phenomenological Point

This chapter argues that the most basic form of subjectivity is different from and more fundamental than having a self, and forwards a hypothesis about the origin of subjectivity in terms of interoception. None of those topics are new, and a consensus concerning the homeostatic-interoceptive origin of subjectivity is rapidly growing in the domains of the neurosciences and psychology. This chapter critically explores that growing consensus, and it argues that the idea that the brain topographically represents bodily states is unfit for thinking about the coming about of subjectivity. In the first part, four inherent characteristics of subjectivity are discussed from a philosophical phenomenological point of view. The second part explores whether a model of subjectivity in which interoception maintains its crucial role is possible without relying on topographical representations of the in-depth body, and giving due to the inherent characteristics of subjectivity.

Bleibende Aufgaben einer phänomenologischen Literaturtheorie

2019 ◽  
Vol 23 (1) ◽  
pp. 265-273
Author(s):  
Eckhard Lobsien
Keyword(s):  
Literary Theory ◽  
Literary Text ◽  
Point Of View ◽  
Literary Texts ◽  
Radical Theory ◽  
Theory Of Reading ◽  
Phenomenological Point

Abstract What sort of object is a literary text? From a phenomenological point of view - phenomenology considered as both a radical theory of reading and a theory of radical reading - a range of answers arise, many of them tinged with deconstructive momentum. This paper aims at pointing out some basic issues in reading literary texts, offering ten theses on the enduring tasks of phenomenological literary theory.

Structural Analysis of an Offshore Jacket Model Under Seismic Excitation

2008 ◽  
Author(s):  
Helder J. D. Correia ◽  
Anto´nio C. Mendes ◽  
Carlos A. F. S. Oliveira
Keyword(s):  
Point Of View ◽  
Shaking Table ◽  
Seismic Excitation ◽  
Model Structure ◽  
Structural Members ◽  
Jacket Structures ◽  
Reaction Forces ◽  
Nodal Displacements ◽  
Good Agreement

In the present work the action of earthquakes upon offshore jacket structures is analysed by means of ADINA software. Our case-study refers to an existing model structure, previously constructed at the Laboratory of Fluid Mechanics of UBI, which has been analysed from the hydrodynamic point of view — Mendes et al. [1, 2]. The seismic excitation will be imposed at the base of this model structure, with frequencies and amplitudes corresponding to actual earthquake conditions transposed to the model scale of 1:45. The FEM software is utilised to calculate the natural frequencies of the model and to obtain stresses at selected members, as well as their nodal displacements. Our purpose is to quantify maximum stresses occurring in critical structural members and to verify the survivability criterion. The predictions of the numerical model, in terms of the reaction forces at the base and acceleration at the top of the structure, are then correlated with the experimental measurements performed when the model structure is excited in an especially designed shaking table (Correia [3]), revealing a good agreement between both results.

Effects of substantial atomic-oxygen migration across silver−oxide interfaces during silver growth

2021 ◽  
pp. 150927
Author(s):  
Eunwook Jeong ◽  
Sang-Geul Lee ◽  
Jong-Seong Bae ◽  
Seung Min Yu ◽  
Seung Zeon Han ◽  
...  
Keyword(s):  
Atomic Oxygen ◽  
Silver Oxide ◽  
Oxide Interfaces ◽  
Oxygen Migration

scholarly journals The Physical and Thermodynamic Functions of Borides

2017 ◽  
Vol 18 (1) ◽  
pp. 58-63
Author(s):  
N.Yu. Filonenko
Keyword(s):  
Free Energy ◽  
Physical Properties ◽  
Thermodynamic Functions ◽  
Point Of View ◽  
Energy Potential ◽  
High Temperature Expansion ◽  
Temperature Dependences ◽  
Function Calculation ◽  
First Time ◽  
Good Agreement

In the paper the physical properties and thermodynamic functions of borides Х2В (Х=W, Mo, Mn, Fe, Co, Ni та Cr) are studied with accounting for fluctuation processes. We use the microstructure analysis, the X-ray structural and the durometric analyses to determine the physical properties of alloys. In the paper it is determined the phase composition and physical properties of borides. In this paper for the first time it is determined the thermodynamic functions of borides using the Hillert and Staffansson model with accounting for the first degree approximation of high-temperature expansion for the free energy potential of binary alloys. We obtain the temperature dependences for such thermodynamic functions as Gibbs free energy, entropy, enthalpy and heat capacity Ср along with their values at the formation temperature for Х2В (Х=W, Mo, Mn, Fe, Co, Ni та Cr). The approach under consideration enables to give more thorough from the thermodynamic point of view description of borides formed from the liquid. The outcomes of the thermodynamic function calculation for borides are in good agreement with experimental data and results of other authors.

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