Wiki use that increases communication and collarboration motivation

Communication and collaboration can be readily enabled by the use of many ICT tools. Wikis are one such platform that provides the opportunity for students to work on group projects without the barriers that arise from traditional group work. Whilst wiki use is becoming more common, its use in education is patchy and pedagogical reasoning and evaluation of such use is under explored. This paper addresses the gap in pedagogy and evaluation in the context of accounting studies. A traditional assessment task of writing an essay that involved a research and knowledge component was redesigned to enable groups to communicate and collaborate at a distance using a wiki. Through participant observation and student reflections of the group project, a wiki was found to be an effective platform to communicate and collaborate on a group project and enabled different barriers to be broken down. Wikis provide ubiquitous access to group work, organisation and version control, levels the playing field for dominant and shy students, and provides transparency for non-performers and high achievers.Robyn Davidso

Optimization and performance calculation of dual-rotation propellers

An analysis is given which enables the design of dual-rotation propellers. It relies on the use of a new tip loss factor deduced from T. Theodorsen's measurements coupled with the general methodology of C. N. H. Lock. In addition, it includes the effect of drag in optimizing. Some values for the tip loss factor are calculated for one advance ratio

The evolution of wave correlations in uniformly turbulent, weakly nonlinear systems

Evolution of wave correlations in uniformly turbulent, weakly nonlinear system

Reliability and structural integrity

An analytic model is developed to calculate the reliability of a structure after it is inspected for cracks. The model accounts for the growth of undiscovered cracks between inspections and their effect upon the reliability after subsequent inspections. The model is based upon a differential form of Bayes' Theorem for reliability, and upon fracture mechanics for crack growth

Nevanlinna-Pick Interpolation and Factorization of Linear Functionals

If \fA is a unital weak-$*$ closed algebra of multiplication operators on a reproducing kernel Hilbert space which has the property \bA_1(1), then the cyclic invariant subspaces index a Nevanlinna-Pick family of kernels. This yields an NP interpolation theorem for a wide class of algebras. In particular, it applies to many function spaces over the unit disk including Bergman space. We also show that the multiplier algebra of a complete NP space has \bA_1(1), and thus this result applies to all of its subalgebras. A matrix version of this result is also established. It applies, in particular, to all unital weak-$*$ closed subalgebras of $H^\infty$ acting on Hardy space or on Bergman space.Comment: 26 pages; minor revisions; to appear in Integral Equations and Operator Theor

Commutant Lifting for Commuting Row Contractions

If $T= \big[ T_1 ... T_n\big]$ is a row contraction with commuting entries, and the Arveson dilation is $\tilde T= \big[ \tilde T_1 ... \tilde T_n\big]$, then any operator $X$ commuting with each $T_i$ dilates to an operator $Z$ of the same norm which commutes with each $\tilde T_i$.Comment: one section and references were adde

On the use of a priori statistics in problems of plasma turbulence

Statistical averaging procedure in problems of plasma turbulence involving Vlasov equatio