Online assessment in Moodle: A framework for supporting our students

With the increased intake of students at many higher education institutions, the teaching, learning and assessment of large groups is one of the biggest challenges facing educators. Appropriate online assessment may address some of the challenges faced in the teaching and learning setting. In this paper, the experiences of 392 mathematics students, undertaking their assessments via Moodle at a University in the Eastern Cape of South Africa, are described. Student experiences informed the design of a supportive-environmental framework for online assessment.The theoretical lens for this research study is framed by mastery learning, student experience and online assessment. The research reported on in this paper highlights one aspect of the project: the third phase of the action-research cycle, namely, to observe the implementation of online assessment.Examples from two blended-learning Moodle courses highlight some of the experienced difficulties and successes. The lessons learnt informed the online-assessment design and implementation to introduce supportive environments for online assessment. The knowledge gained from this study culminated in a 4-Pillar Supportive-Online Assessment Framework for Blended-Learning environments, which could contribute to an improvement in online-assessment practices.

Increasing dimension asymptotics for two-way crossed mixed effect models

This paper presents asymptotic results for the maximum likelihood and restricted maximum likelihood (REML) estimators within a two-way crossed mixed effect model as the sizes of the rows, columns, and cells tend to infinity. Under very mild conditions which do not require the assumption of normality, the estimators are proven to be asymptotically normal, possessing a structured covariance matrix. The growth rate for the number of rows, columns, and cells is unrestricted, whether considered pairwise or collectively.Comment: 24 page

Improving well-being and outcomes for looked after children in Wales: a context sensitive review of interventions

Improving outcomes for looked after children and young people has been a longstanding concern in Wales. This article reports the findings of a scoping study which sought to identify interventions aimed at improving outcomes for looked after children that are effective or promising. The study was commissioned by an independent funding body to inform a £5 million investment programme for Wales. It comprised a rapid review of literature, informed through consultation with an expert advisory panel and groups of young people who had been in care. The article outlines the rapid review method, provides details of shortlisted interventions and describes the interventions subsequently approved for investment. It concludes that although there are many promising interventions which address the factors associated with poor outcomes for looked after children, the evidence base is weak. It is argued that decision-making on interventions should be informed by appraisal of the empirical evidence available, but should also be guided by professional judgement that considers the needs, priorities and preferences of service users, carers, practitioners and policy-makers

Cavitation-induced force transition in confined viscous liquids under traction

We perform traction experiments on simple liquids highly confined between parallel plates. At small separation rates, we observe a simple response corresponding to a convergent Poiseuille flow. Dramatic changes in the force response occur at high separation rates, with the appearance of a force plateau followed by an abrupt drop. By direct observation in the course of the experiment, we show that cavitation accounts for these features which are reminiscent of the utmost complex behavior of adhesive films under traction. Surprisingly enough, this is observed here in purely viscous fluids.Comment: Submitted to Physical Review Letters on May 31, 2002. Related informations on http://www.crpp.u-bordeaux.fr/tack.htm

Normalized ghost imaging

We present an experimental comparison between different iterative ghost imaging algorithms. Our experimental setup utilizes a spatial light modulator for generating known random light fields to illuminate a partially-transmissive object. We adapt the weighting factor used in the traditional ghost imaging algorithm to account for changes in the efficiency of the generated light field. We show that our normalized weighting algorithm can match the performance of differential ghost imaging

The Computational Complexity of Knot and Link Problems

We consider the problem of deciding whether a polygonal knot in 3-dimensional Euclidean space is unknotted, capable of being continuously deformed without self-intersection so that it lies in a plane. We show that this problem, {\sc unknotting problem} is in {\bf NP}. We also consider the problem, {\sc unknotting problem} of determining whether two or more such polygons can be split, or continuously deformed without self-intersection so that they occupy both sides of a plane without intersecting it. We show that it also is in NP. Finally, we show that the problem of determining the genus of a polygonal knot (a generalization of the problem of determining whether it is unknotted) is in {\bf PSPACE}. We also give exponential worst-case running time bounds for deterministic algorithms to solve each of these problems. These algorithms are based on the use of normal surfaces and decision procedures due to W. Haken, with recent extensions by W. Jaco and J. L. Tollefson.Comment: 32 pages, 1 figur

Chirped pulse Raman amplification in plasma

Raman amplification in plasma has been proposed to be a promising method of amplifying short radiation pulses. Here, we investigate chirped pulse Raman amplification (CPRA) where the pump pulse is chirped and leads to spatiotemporal distributed gain, which exhibits superradiant scaling in the linear regime, usually associated with the nonlinear pump depletion and Compton amplification regimes. CPRA has the potential to serve as a high-efficiency high-fidelity amplifier/compressor stage

Pepper-pot emittance measurement of laser-plasma wakefield accelerated electrons

The transverse emittance is an important parameter governing the brightness of an electron beam. Here we present the first pepper-pot measurement of the transverse emittance for a mono-energetic electron beam from a laser-plasma wakefield accelerator, carried out on the Advanced Laser-Plasma High Energy Accelerators towards X-Rays (ALPHA-X) beam line. Mono-energetic electrons are passed through an array of 52 mu m diameter holes in a tungsten mask. The pepper-pot results set an upper limit for the normalised emittance at 5.5 +/- 1 pi mm mrad for an 82 MeV beam

Applying a Team Performance Framework to better Understand the Handoff Process: Part 1

Handoffs require critical information transfers that are clear, comprehensible, and correct from receiver to sender. There are many factors that influence the reliability of the information in a handoff procedure, and impact the subsequent choices that are made that affect patient care. Using the Input – Mediator – Output – Input model multiple factors that influence the information transfer process have been identified to better handoff communication and in turn, lead to better patient care. The IMOI model is a recently developed theory that claims the productivity and value of interaction among team members can be influenced by cognitive, affective, and external factors (Weaver et al., 2013). This clarifies that the output affects the future performance of a group through a feedback loop, as well as reflects variability in mediational influences. This paper focuses on the first two parts of the IMOI model; input and mediators. Individual characteristics affect the handoff process for both the sender and receiver, including attitudes, expertise, experience, expectations, and fitness for duty. The inputs of a handoff are the individual characteristics of the providers and the patient case, where mediation is the shared process to develop an outcome. The attitudes, expertise, experience, and fitness for duty influence the composition of the team, but are moderated by factors such as interventions, communication, resources, team monitoring, and team orientation. By understanding these factors, providers can create a safer environment and provide safer patient care