5,078 research outputs found
Maxwell's Theory of Solid Angle and the Construction of Knotted Fields
We provide a systematic description of the solid angle function as a means of
constructing a knotted field for any curve or link in . This is a
purely geometric construction in which all of the properties of the entire
knotted field derive from the geometry of the curve, and from projective and
spherical geometry. We emphasise a fundamental homotopy formula as unifying
different formulae for computing the solid angle. The solid angle induces a
natural framing of the curve, which we show is related to its writhe and use to
characterise the local structure in a neighborhood of the knot. Finally, we
discuss computational implementation of the formulae derived, with C code
provided, and give illustrations for how the solid angle may be used to give
explicit constructions of knotted scroll waves in excitable media and knotted
director fields around disclination lines in nematic liquid crystals.Comment: 20 pages, 9 figure
Open Access eXchange (OAeX): an economic model and platform for fundraising open scholarship services
This article describes the Open Access eXchange (OAeX) project, a pragmatic and comprehensive
economic model and fundraising platform for open scholarship initiatives. OAeX connects bidders
with funders at scale and right across the open scholarship spectrum through crowdfunding: financial
expenditure is regulated by a market of freely competing providers and financial transactions and
transparency are assured by a clearing-house entity. Specifically, OAeX seeks to facilitate open access
publishing without the barrier of article processing charges (APCs), as well as contribute to solving
challenges of transparency and economic sustainability in open scholarship projects in the broader sense
"Busybodies, Cranks and Mischief-Makers": Revisiting Finnigan v New Zealand Rugby Football Union and the Pro Bono Ethos
Finnigan v New Zealand Rugby Football Union has assumed a prominent position in New Zealand's relatively short legal history. This is in part due to the legal principles established by the case – it is recognised as a leading case in both administrative law and sports law. The case is perhaps more notable for its social and historical significance – it is fondly remembered as "the case that stopped the tour". This article argues that the case is significant on two further levels. It is a little-known fact that the case was taken on an entirely pro bono basis. The premise of this article is that, without the pro bono ethos of the lawyers involved, one of New Zealand's most famous cases would never have eventuated. The second little-known element of the case is how the plaintiffs' lawyers tactfully avoided the common law doctrine of maintenance. The true significance of Finnigan v New Zealand Rugby Football Union is only realised when the case is examined from a wider perspective than has been done previously. 
Concerns of middle and high school teachers toward inclusion of students with exceptional education needs
Includes bibliographical references
C*-algebras associated to graphs of groups
To a large class of graphs of groups we associate a C*-algebra universal for
generators and relations. We show that this C*-algebra is stably isomorphic to
the crossed product induced from the action of the fundamental group of the
graph of groups on the boundary of its Bass-Serre tree. We characterise when
this action is minimal, and find a sufficient condition under which it is
locally contractive. In the case of generalised Baumslag-Solitar graphs of
groups (graphs of groups in which every group is infinite cyclic) we also
characterise topological freeness of this action. We are then able to establish
a dichotomy for simple C*-algebras associated to generalised Baumslag-Solitar
graphs of groups: they are either a Kirchberg algebra, or a stable
Bunce-Deddens algebra.Comment: 59 page
- …