3,019 research outputs found
Looking Back: Does Social Capital Still Matter for Health? Revisiting Pearce and Davey Smith 20 Years On
No full textLooking Back: Does Social Capital Still Matter for Health? Revisiting Pearce and Davey Smith 20 Years O
Using gravitational wave signals to disentangle early matter dominated epochs
No full textCurvature perturbations induce gravitational waves (GWs) at second order, contributing to the stochastic gravitational wave background. The resulting gravitational wave spectrum is sensitive to the evolutionary history of the universe and can be substantially enhanced by early matter-dominated (eMD) epochs, particularly if they end rapidly. Such epochs can be caused by primordial black holes (PBHs) and non-topological solitons (Q-balls), for example. Prior analysis approximated the end of the eMD epoch as instantaneous or used a Gaussian smoothing. In this work, we present a complete analysis fully incorporating their time-evolving decay rates. We demonstrate that the resulting signal spectra from PBH, thin wall Q-ball, thick wall Q-ball, and delayed Q-ball eMD epochs are distinguishable for monochromatic distributions. We then consider log-normal mass distributions and discuss the distinguishability of the various GW spectra. Importantly we find that the change in the spectrum from a finite mass width is qualitatively different from the change arising from a slower transition to radiation domination
Gravity wave signals from early matter domination: interpolating between fast and slow transitions
No full textAn epoch of matter domination in the early universe can enhance the primordial stochastic gravitational wave signal, potentially making it detectable to upcoming gravitational wave experiments. However, the resulting gravitational wave signal is quite sensitive to the end of the early matter-dominated epoch. If matter domination ends gradually, a cancellation results in an extremely suppressed signal, while in the limit of an instantaneous transition, there is a resonant-like enhancement. The end of the matter dominated epoch cannot be instantaneous, however, and previous analyses have used a Gaussian smoothing technique to account for this, and consider only a limited regime around the fast transition limit. In this work, we present a study of the enhanced gravitational wave signal from early matter domination without making either approximation and show how the signal smoothly evolves from the strongly suppressed to strongly enhanced regimes
Interview with Matthew Taylor
No full textMatthew Taylor, Chief Adviser on Political Strategy to the Prime Minister between 2005 and 2007 explains the importance of stakeholder and media strategies adopted by the Turner Pensions Commission
Performance audit, Pearce Elementary School District
No full textabstract: In fiscal year 2011, Pearce Elementary School District’s student AIMS scores were similar to peer districts’ averages. Although per pupil costs were high in some operational areas, the District was reasonably efficient overall. Pearce ESD’s per pupil administration costs were similar to the peer districts’ average, and although its plant operations, food service, and transportation program operated with higher per pupil costs than peer districts, these areas operated in a reasonably efficient manner
considering factors such as the age of the District’s buildings, number of meals served, and transportation miles driven. Although relatively efficient, the District should strengthen some of its accounting controls, including ensuring proper separation of duties for its payroll and purchasing processes and ensuring purchases are properly approved before they are made. The District should also strengthen some of its computer controls, such as the requirements for network passwords.Report (Arizona. Office of the Auditor General) ; 2013-13
is the author of many papers and reports. Tim was born in 1950.
No full textTim Pearce has responsibility for work relating to vehicle safety and institutional strengthening in developing countries. He was involved in UK transport-related research projects for 15 years before specialising in problems relating to developing countries. During the last 10 years he has been closely involved in the problems of the roadworthiness of vehicles both from the technical and institutional sides. He has worke
Pearce & Stevens' Trusts and Equitable Obligations
No full textPearce & Stevens’ Trusts and Equitable Obligations provides a detailed and contextualized account of the law of equity and trusts. The text gives detailed analysis of all key decisions, statutes, and current academic debates related to the law of equity and trusts, providing a grounding in the subject. This new edition, which includes substantial additions on trusts of the family home, charities, and wills and intestate succession, brings the law coherently together. The text has been updated with recent cases and developments in the area, including Stoffel and Co v Grondona [2020] UKSC 42 on illegality, Manchester Building Society v Grant Thornton UK LLP [2021] UKSC 20 on advisor liability, Webb v Webb [2020] UKPC 22 on beneficial ownership, and Matthew v Sedman [2021] 1 UKSC 19 on the running of time limits in limitation actions
Trace element geochemistry of peridotites from the Izu-Bonin-Mariana Forearc, Leg 125
No full textTrace element analyses (first-series transition elements, Ti, Rb, Sr, Zr, Y, Nb, and REE) were carried out on whole rocks and minerals from 10 peridotite samples from both Conical Seamount in the Mariana forearc and Torishima Forearc Seamount in the Izu-Bonin forearc using a combination of XRF, ID-MS, ICP-MS, and ion microprobe. The concentrations of incompatible trace elements are generally low, reflecting the highly residual nature of the peridotites and their low clinopyroxene content (n ratios in the range of 0.05-0.25; several samples show possible small positive Eu anomalies. LREE enrichment is common to both seamounts, although the peridotites from Conical Seamount have higher (La/Ce)n ratios on extended chondrite-normalized plots, in which both REEs and other trace elements are organized according to their incompatibility with respect to a harzburgitic mantle. Comparison with abyssal peridotite patterns suggests that the LREEs, Rb, Nb, Sr, Sm, and Eu are all enriched in the Leg 125 peridotites, but Ti and the HREEs exhibit no obvious enrichment. The peridotites also give positive anomalies for Zr and Sr relative to their neighboring REEs. Covariation diagrams based on clinopyroxene data show that Ti and the HREEs plot on an extension of an abyssal peridotite trend to more residual compositions. However, the LREEs, Rb, Sr, Sm, and Eu are displaced off this trend toward higher values, suggesting that these elements were introduced during an enrichment event. The axis of dispersion on these plots further suggests that enrichment took place during or after melting and thus was not a characteristic of the lithosphere before subduction.
Compared with boninites sampled from the Izu-Bonin-Mariana forearc, the peridotites are significantly more enriched in LREEs. Modeling of the melting process indicates that if they represent the most depleted residues of the melting events that generated forearc boninites they must have experienced subsolidus enrichment in these elements, as well as in Rb, Sr, Zr, Nb, Sm, and Eu. The lack of any correlation with the degree of serpentinization suggests that low-temperature fluids were not the prime cause of enrichment. The enrichment in the high-field-strength elements also suggests that at least some of this enrichment may have involved melts rather than aqueous fluids. Moreover, the presence of the hydrous minerals magnesio-hornblende and tremolite and the common resorption of orthopyroxene indicate that this high-temperature peridotite-fluid interaction may have taken place in a water-rich environment in the forearc following the melting event that produced the boninites. The peridotites from Leg 125 may therefore contain a record of an important flux of elements into the mantle wedge during the initial formation of forearc lithosphere. Ophiolitic peridotites with these characteristics have not yet been reported, perhaps because the precise equivalents to the serpentinite seamounts have not been analyzed
Playing Ethnography: A study of emergent behaviour in online games and virtual worlds
No full textThis study concerns itself with the relationship between game design and emergent social behaviour in massively multiplayer online games and virtual worlds. This thesis argues for a legitimisation of the study of ‘communities of play’, alongside communities perceived as more ‘serious’, such as communities of interest or practice. It also identifies six factors that contribute to emergent social behaviour and investigates the relationship between group and individual identity, and the emergent ways in which these arise from and intersect with the features and mechanics of the game worlds themselves.
Methodology: Under the rubric of ‘design research’, this study was conducted as an ethnographic intervention, an anthropological investigation that deliberately privileged the online experience whilst acknowledging the performative nature of both game play and the research process itself. The research was informed by years of professional practical experience in game design and playtesting, as well as by qualitative methods derived from the fields of Anthropology, Sociology, Computermediated Communications and the emerging field of Game Studies. The process of conducting the eighteen-month ethnographic study followed the progress of a sub-set of members of the ‘Uru Diaspora,’ a group of 10,000 players who were made refugees when the massively multiplayer game ‘Uru: Ages Beyond Myst’ was closed in February of 2004. Uru refugees immigrated into other virtual worlds, using their features and capabilities to create ethnic communities that emulated the culture, artefacts and environments of the original Uru world. Over time, players developed ‘hybrid’ cultures, integrating the Uru culture with that of their new homes, and eventually creating entirely new Uru and Myst-inspired content.
The outcome is the identification of six factors that serve as ‘engines for emergence’ and discusses their relationship to each other, to game design, and to emergent behaviour.
These include:
• Play Ecosystems: Fixed-Synthetic vs. Co-Created Worlds: Online games and virtual worlds exist along a spectrum, with environments entirely authored by the designer at one end, and those comprised primarily of player-created content and assets on the other, with a range of variations between. The type of world will impact the sort of emergent behaviour that occurs, and worlds that include player-created content will be more inclined to promote emergent behaviour.
• Communities of Play: Distributed groups formed around play demonstrate distinct characteristics based on shared values and play styles. The study describes in detail one such play community, and analyses the ways in which its characteristic play styles drove its emergent behaviours.
• The Social Construction of Avatar Identity: Individual avatar identity is constructed through an emergent process engaging social feedback.
• Intersubjective Flow: A social reading of the psychological notion of ‘flow’ that describes the way in which flow dynamics occur in a social context through play.
• Productive Play: Countering the traditional contention that play is inherently ‘unproductive’ as some scholars suggest, the thesis argues that play can be seen as a form of cultural production, as well as fulcrum for creative activity.
• Porous Magic Circles and the ‘Ludisphere’: The magic circle, which bounds play activities, is more porous than game scholars had previously believed. The term ‘ludisphere' is used to describe the larger context of aggregated play space via the Internet. Also identified are leakages between ‘virtual worlds’ and ‘real life’.
By identifying these factors and attempting to trace their roots in game design, the study aims to contribute a new approach to the making and analysis of user experience and creativity ‘in game’. The thesis posits that by achieving a deeper cultural understanding of the relationship between design and emergent behaviour, it is possible to make steps forward in the study of ‘emergence’ itself as a design
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I dreamed last night of our old house, Maggie
No full textA lyrical song in which the author reminisces scenes and landscapes from Newfoundland (shores, friends, berries, caplin) as well as the earlier days where he walked by them in the company of his young bride Maggie to whom the song is addressed.The song was composed by Aubrey Pearce from Maberly, Trinity Bay, in 1966 on the occasion of "Come Home Year" in Newfoundland. It was sung to the tune of "When You and I Were Young, Maggie". The song was collected from a clipping of the "Fisherman's Advocate" (no further details)
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