Finite element modelling of electrostatic fields in process tomography capacitive electrode systems for flow response evaluation

Various aspects and results of 2-D finite element (FE) modeling of electrostatic fields in 12-electrode capacitive systems for two-phase flow imaging are described. The capacitive technique relies on changes in capacitances between electrodes (mounted on the outer surface of the flow pipe) due to the change in permittivities of flow components. The measured capacitances between various electrode pairs and the field computation data are used to reconstruct the cross sectional image of the flow components. FE modeling of the electric field is necessary to optimize design variables and evaluate the system response to various flow regimes, likely to be encountered in practice. Results are presented in terms of normalized capacitances for various flow regimes. The effects of key geometric parameters of the electrode system are presented and analyzed

Validation of Finite Element Modelling of Multielectrode Capacitive System for Process Tomography Flow Imaging

Finite element modelling of process tomography sensor systems is necessary for their CAD both for performance evaluation and design optimization. This paper involves the validation of finite element models of a 12-electrode capacitive sensor system for multiphase flow imaging. Various results of modelling have been compared in the form of standing mode capacitances and sensor sensitivity distribution with experimental data obtained from UMIST. There is good agreement between simulation results and experiments especially for high sensitivity regions inside the pipe

Adequate Funding of Education in Georgia: What Does It Mean, What Might It Cost, How Could It Be Implemented? - Brief

This report contains a discussion of what adequate funding for education means and how it has been estimated for other statesThe report then explores the financial implications for Georgia of funding adequacy. FRC Brief 12

Survivors of male rape: the emergence of a social and legal issue.

Little is known about the crime of adult male-on-male rape. The present study aims to explore the nature and impact of male rape on men's lives using statistics from SurvivorsUK (1344 cases) and a victimisation survey of 16 men to generate qualitative data for this purpose. The reluctance of men to report rape is explored using this data, as are men's needs in terms of service provision. Semi structured interviews with seven male rape counsellors are used to further examine these points. A newspaper content analysis over a 13-year period documents the emergence of male rape as a social and legal issue and also illustrates that male rape myths are perpetuated by coverage of this phenomenon. A questionnaire of 93 police officers across seven divisions of the Metropolitan Police Service considers police responses to, and attitudes towards, male rape, and demonstrates that such myths are manifest within the police service. The findings demonstrate that the impact of rape on men's lives is severe and that men experience rape trauma syndrome as identified in female rape victims. This trauma is intensified by rape myths rooted within society, perpetuated by newspapers, and manifest within the police service. An acute information gap in police training on male rape is identified and the research illustrates a strong need for multi-agency support systems for male survivors. The Male Victims of Sexual Abuse Steering Group is a multi-agency group chaired by the Metropolitan Police and established to draw information from different agencies to develop research and awareness of male rape and sexual abuse. Current initiatives from this group are presented. The research explores the theoretical positions of positivism, feminism and masculinities and examines the importance of these in understanding the male survivor of rape. In focusing on the experiences of male survivors the study identifies the need for social and cultural change to validate these experiences. It is suggested that these be supported with changes in legislation to include oral and object penetration under existing rape law so as to give legal recognition to these experiences. It is evident that policy changes are therefore needed to reflect the needs and demands for survivors of a very real social and legal issue. The research demonstrates a clear contribution to the theoretical debates in criminology which provide an understanding of rape, and which underpin the empirical work. The empirical work is a contribution to research in terms of understanding the phenomenon of male rape and the findings demonstrate the wider policy implications of that work. As such, the thesis is an advancement of knowledge and research and provides for future policy directions to suppor

A multiscale overview of modelling rolling cyclic fatigue in bearing elements

During service, bearing components experience rolling cyclic fatigue (RCF), resulting in subsurface plasticity and decay of the parent microstructure. The accumulation of micro strains spans billions of rolling cycles, resulting in the continuous evolution of the bearing steel microstructure. The bearing steel composition, non-metallic inclusions, continuously evolving residual stresses, and substantial work hardening, followed by subsurface softening, create further complications in modelling bearing steel at different length scales. The current study presents a multiscale overview of modelling RCF in terms of plastic deformation and the corresponding microstructural alterations. This article investigates previous models to predict microstructural alterations and material hardening approaches widely adopted to mimic the cyclic hardening response of the evolved bearing steel microstructure. This review presents state-of-the-art, relevant reviews in terms of this subject and provides a robust academic critique to enhance the understanding of the elastoplastic response of bearing steel under non-proportional loadings, damage evolution, and the formation mechanics of microstructural alterations, leading to the increased fatigue life of bearing components. It is suggested that a multidisciplinary approach at various length scales is required to fully understand the micromechanical and metallurgical response of bearing steels widely used in industry. This review will make significant contributions to novel design methodologies and improved product design specifications to deliver the durability and reliability of bearing elements

Further investigations and parametric analysis of microstructural alterations under rolling contact fatigue

Bearing elements under rolling contact fatigue (RCF) exhibit microstructural features, known as white etching bands (WEBs) and dark etching regions (DERs). The formation mechanism of these microstructural features has been questionable and therefore warranted this study to gain further understanding. Current research describes mechanistic investigations of standard AISI 52100 bearing steel balls subjected to RCF testing under tempering conditions. Subsurface analyses of RCF-tested samples at tempering conditions have indicated that the microstructural alterations are progressed with subsurface yielding and primarily dominated by thermal tempering. Furthermore, bearing balls are subjected to static load tests in order to evaluate the effect of lattice deformation. It is suggested from the comparative analyses that a complete rolling sequence with non-proportional stress history is essential for the initiation and progression of WEBs, supported by the combination of carbon flux, assisted by dislocation and thermally activated carbon diffusion. These novel findings will lead to developing a contemporary and new-fangled prognostic model applied to microstructural alterations