Volumes of highly twisted knots and links

We show that for a large class of hyperbolic knots and links, we can determine bounds on the volume of the link complement from combinatorial information given by a link diagram. Specifically, there is a universal constant C such that if a knot or link admits a prime, twist reduced diagram with at least 2 twist regions and at least C crossings per twist region, then the link complement is hyperbolic with volume bounded below by 3.3515 times the number of twist regions in the diagram. C is at most 113.Comment: 14 pages, 4 figures. Minor changes to clarify exposition, fix typos, and correct a historical inaccuracy in the introduction. Paper has now appeared in AG

The acquisition of spanish perfective aspect : A study on children's production and comprehension

This paper presents the acquisition of Spanish perfective aspect in production and comprehension. It argues that, although young children use perfective aspect to talk about completed events, young children have difficulty in assessing perfective meaning from perfective morphology. This paper proposes that in the process of acquiring aspectual meaning, children use local strategies to decode aspectual meaning from form: when analyzing a completed situation, young children depend on certain learnability factors to correctly assess the entailment of completion of the perfective, namely, their ability to determine if the object of the event measures out the event as a whole or not, and their ability to read the agent’s intentions. When those factors are removed from the situation, young children had difficulty determining the entailment of completion of perfective aspect. This study also suggests that the manner in which aspectual information is conveyed in a language, may play a role on the readiness of the acquisition of the semantic morphology of the language (e.g., verb+object vs. verb+affixes). The results of this study indicate that successful performance on the semantics of Spanish perfective aspect develops around the age of 5-6

Using audio visuals to illustrate concepts

This short pedagogic paper investigates the use of audio visual presentation techniques to enhance teaching and learning in the classroom. It looks at the current 'MTV' generation of students who find it difficult to concentrate for long periods of time

Investing in Healthy, Sustainable Places Through Urban Agriculture

The purpose of this paper is to provide funders with an overview of urban agriculture and its benefits; its connections to the community-based food system; and how foundations are supporting and encouraging urban agriculture as a public health, social enterprise, environmental stewardship, and/or economic development strategy. With bibliographical references

The evolution of morality and the end of economic man

1871 saw the publication of two major treatises in economics, with self-seeking economic man at their center. In the same year Darwin published The Descent of Man, which emphasized sympathy and cooperation as well as self-interest, and contained a powerful argument that morality has evolved in humans by natural selection. Essentially this stance is supported by modern research. This paper considers the nature of morality and how it has evolved. It reconciles Darwin's notion that a developed morality requires language and deliberation (and is thus unique to humans), with his other view that moral feelings have a long-evolved and biologically-inherited basis. The social role of morality and its difference with altruism is illustrated by an agent-based simulation. The fact that humans combine both moral and selfish dispositions has major implications for the social sciences and obliges us to abandon the pre-eminent notion of selfish economic man. Economic policy must take account of our moral nature.Peer reviewedFinal Accepted Versio

Expanding Higher Education in the UK: From 'System Slowdown' to 'System Acceleration'

This paper sets out to explore the implications of current patterns of participation and attainment, particularly among 16-19 year olds, for the further expansion of higher education in the UK. It uses a range of recent statistics on participation and attainment to describe what is termed ‘system slowdown’. It then goes on to explore a basis for ‘system acceleration’ through the development of five possible routes into higher education both for 16-19 year olds and for adults. We conclude the paper by looking briefly at a number of inter-related strategies the Government could adopt to encourage ‘system acceleration’. We suggest that unless the Government is prepared to consider policy changes of this type, it is unlikely to reach the higher education participation target it has set itself and may also jeopardise the basis for a sustainable lifelong learning system for the 21st century