115,253 research outputs found
Determining the effectiveness of the HERS-SA Academy using the Kirkpatrick framework of training evaluation
No full textIncludes bibliographical references (leaves 76-86).The research evaluated the outcomes of Higher Education Resource Service South Africa (HERS-SA) Academy using the Kirkpatrick (1996a) framework of training evaluation. The study used a three-stage research design to evaluate Academy outcomes in tenns of the reactions, learning and behaviour levels of the Kirkpatrick (1996a) framework. Two main findings emerged from the research: (1) the reactions and learning outcomes of the Academy are successful while the behaviour outcomes are only partially successful, and (2) increased confidence and increased understanding of HE are by far the strongest outcomes of the Academy. Based on the major findings of the research, a number of recommendations were made primarily to improve the behaviour outcomes of the Academy
Kirkpatrick Baez X-ray optics for astrophysics: Recent status
No full textX-ray optics in Kirkpatrick Baez arrangement represent promising alternative to Wolter optics in common use. We present briefly recent status of design, developments, and tests of this kind of X–ray optics including Kirkpatrick Baez module developed and tested within the EU AHEAD project
Kirkpatrick Drilling Company truck
No full textBlack and white photograph of truck belonging to Kirkpatrick Drilling Company. The truck is parked on the street in front of the Cruse-Crawford Manufacturing Company
Study of jet precession, recirculation and vortex breakdown in turbulent swirling jets using LES.
No full textLarge eddy simulations (LES) are used to investigate turbulent isothermal swirling flows with a strong emphasis on vortex breakdown, recirculation and instability behaviour. The Sydney swirl burner configuration is used for all simulated test cases from low to high swirl and Reynolds numbers. The governing equations for continuity and momentum are solved on a structured Cartesian grid, and a Smagorinsky eddy viscosity model with the localised dynamic procedure is used as the sub-grid scale turbulence model. The LES successfully predicts both the upstream first recirculation zone generated by the bluff body and the downstream vortex breakdown bubble. The frequency spectrum indicates the presence of low frequency oscillations and the existence of a central jet precession as observed in experiments. The LES calculations well captured the distinct precession frequencies. The results also highlight the precession mode of instability in the center jet and the oscillations of the central jet precession, which forms a precessing vortex core. The study further highlights the predictive capabilities of LES on unsteady oscillations of turbulent swirling flow fields and provides a good framework for complex instability investigations
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Investigation of the influence of swirl on a confined coannular swirl jet
No full textLarge Eddy Simulations are used to model a turbulent confined coannular combustor and examine the effects of swirl on the flow field and mixing. Three separate simulations with relatively high mesh resolutions and different swirl numbers have been carried out using a finite volume method on a Cartesian non-uniform structured grid. A localised dynamic Smagorinsky model is used to parameterize the subgrid scale turbulence. The snapshots of the axial and swirl velocities and velocity vector fields show the complex flow patterns developing with increased swirl number and the rapid decay of axial momentum. Precessing vortex cores (PVC) were identified for all three cases and the mean axial velocity plots indicate that the upstream extremity of the vortex breakdown bubble shifts towards the inlet as the swirl number increases. The calculated power spectra indicate the distinct precession frequency for high swirl number. Probability density functions of axial velocity showed the changes of their distributions from approximately Gaussian to non-Gaussian with increased swirl number. The swirl has a large effect on the rate of decay of the axial velocity throughout the domain, whereas only has a significant effect on the decay of swirl velocity in the near field close to the jet inlet. The relation between swirl number and the axial extent of the recirculation zone is approximately linear. Radial plots of mean passive scalar and its variance also demonstrate an increase in the rate of mixing with increasing swirl number
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Corporate Boards and Environmental Offence Conviction: Evidence from the United Kingdom
No full textPurpose This paper reports the results of an investigation into the relationship between corporate boards and the likelihood of a firm being convicted of an environmental offence in the United Kingdom (UK). Design/Methodology/Approach The study uses a probit model to analyse the relationship between corporate boards and the likelihood of a firm being convicted of an environmental offence in the UK, controlling for firm size, financial leverage and profitability. Findings The results suggest that the likelihood of a firm being convicted of an environmental offence increases with board size, but decreases with the presence of a woman on the board. No support is found for our hypotheses about the proportion of outside directors and the presence of a lawyer on the board. Marginal effects results also show that adding one member to the board increases the chance of a firm being convicted for an environmental offence by 4.2% while having a woman on the board decreases the likelihood of a firm being convicted of an environmental offence by 31.8%. Research limitations/implications The sample size of 55 firms is small which could affect the generalisability of the study. Originality/Value The study uses proprietary data obtained from the UK Environmental Agency to provide evidence for the first time how corporate boards affect the chances of a listed firm being convicted of an environmental offence in the UK
- …
