2,918 research outputs found
Environmental economics and the Murray-Darling river system
No full textMuch concern about the negative environmental consequences of agricultural development in Australia, including salinisation, waterlogging and algal blooms, has focused on the problems of the Murray–Darling Basin. The aim of this article is to provide an overview of the environmental problems of the Murray–Darling Basin from an economic perspective, and a selective survey of the relevant economic literature, including theoretical analysis, modelling and contributions to the development of water policy. In attempting to understand the complex problems of the Murray–Darling Basin, an eclectic approach drawing on externality, sustainability and property rights perspectives seems most appropriate.Environmental Economics and Policy, Resource /Energy Economics and Policy,
John Pearce Memorial Lecture 2021
No full textVideo of 7th annual John Pearce Memorial Lecture, delivered by Lesley Riddoch as a webinar on 12th October 2021
Modeling hydrography and marine sedimentation in the Cariaco Basin since the Last Glacial Maximum
No full textThe Cariaco Basin has shallow connections with the Caribbean Sea, and these are further reduced at times of lower sea level, such as at the Last Glacial Maximum (LGM). A numerical model was developed to describe the oceanography and biogenic sedimentation in the Cariaco Basin and nearby Caribbean. The model is run with different sea levels in order to simulate the changing oceanography and the development of deep water anoxia in the Cariaco Basin since the LGM. In the main sequence of numerical experiments, the surface forcing is kept fixed at present?day values while the sea level is changed in order to separate the effects of sea level from the effects of climate. As the sea level rises, the main sedimentation zone moves first to the shallow broad northern sill and NE part of the Cariaco Basin and then, once sea level reaches approximately 60 m below present, moves south to the northern coast of mainland Venezuela. The model shows that there would be an overall increase in sedimentation in the basin as the sea level rises, even if there was no change in the surface forcing. However, the model also shows that sedimentation at particular points in the basin exhibits more complicated behavior, which needs to be taken into account when interpreting individual records. Preliminary numerical experiments examine the effects of changing surface forcing while keeping the sea level at LGM values, and the applicability of a mathematical hydraulic control model in this case is also considered
John Pearce Memorial Lecture 2020
No full textVideo recording of the 6th annual John Pearce Memorial Lecture delivered by Ed Mayo CEO of Pilotlight on Monday 16th November 2020 as webinar.
Also attached are the PowerPoint slides used for Ed's lecture and a PDF file containing the questions the attendees asked
John Pearce Memorial Lecture 2022
No full textThe 8th annual John Pearce Memorial Lecture was delivered by Aidan Pia at GCU on the 11th October 2022. This resource contains notes and documents relating to the Lecture and The Senscot Story. See related URLs for a You Tube video of the lecture
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
The niche of benthic foraminifera, critical thresholds and proxies
No full textEcological studies of benthic foraminifera are carried out to explain patterns of distribution and the dynamics of communities. They are also used to provide data to establish proxy relationships with selected factors. According to niche theory, the patterns of distribution of benthic foraminifera are controlled by those environmental factors that have reached their critical thresholds. For each species, in variable environments, different factors may be limiting distributions both temporally and spatially. For a species or an assemblage to be useful as a proxy its abundance must show a strong correlation with the chosen factor. Since numerous factors influence each species, it is only in those environments where the majority of factors show little variation but one particular factor shows significant variation that the proxy relationship for that factor can be determined. On theoretical grounds, the reliability of using foraminiferal abundance as a proxy of a selected environmental factor should be restricted to the range close to the upper and lower thresholds. For oxygen, foraminifera are potential proxies for the lower limits but once oxygen levels rise to values of perhaps >1 or 2 ml l-1, there is no longer a relationship between oxygen levels and abundance. By contrast, the flux of organic matter over a large range shows a sufficiently close relationship with foraminiferal assemblages so that transfer functions can be derived for the deep sea. However, the relationship at species level is far less clear cut. Much more accurate estimates of primary productivity and modern organic flux rates are required to improve the determination of past flux rates
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
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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