The reliance on distant resources for egg formation in high Arctic breeding barnacle geese Branta leucopsis

Breeding in the high Arctic is time constrained and animals should therefore start with their annual reproduction as early as possible. To allow for such early reproduction in migratory birds, females arrive at the breeding grounds either with body stores or they try to rapidly develop their eggs after arrival using local resources. Svalbard breeding barnacle geese Branta leucopsis have to fly non-stop for about 1100 km from their last continental staging site to the archipelago making the transport of body stores costly. However, environmental conditions at the breeding grounds are highly unpredictable favouring residual body stores allowing for egg production after arrival on the breeding grounds. We estimated the reliance on southern continental resources, i.e. body stores for egg formation, in barnacle geese using stable isotope ratios in the geese's forage along the flyway and in their eggs. Females adopted mixed breeding strategies by using southern resources as well as local resources to varying extents for egg formation. Southern capital in lipid-free yolk averaged 41% (range: 23-65%), early laid eggs containing more southern capital than eggs laid late in the season. Yolk lipids and albumen did not vary over time and averaged a southern capital proportion of 54% (range: 32-73%) and 47% (range: 25-88%), respectively. Our findings indicate that female geese vary the use of southern resources when synthesising their eggs and this allocation also varies among egg tissues. Their mixed and flexible use of distant and local resources potentially allows for adaptive adjustments to environmental conditions encountered at the archipelago just before breeding.

The architecture of peer assessment : do academically successful design students make good team mates in design assignments?

This paper considers the relationship between architecture and construction management students’ overall academic abilities (as measured by Weighted Average Marks [WAMs]), their peer ratings for contributions to team design assignments (as measured by an online Self-and-Peer-Assessment [SAPA] tool), and their specific abilities as building designers (as measured by grades in individual design assignments). The research was conducted to determine whether a student’s prior academic achievements might indicate how well they will work in teams. The research demonstrates a statistically significant relationship between WAMs and SAPA ratings indicating that academically successful students more often than not make good teammates. However, the study also highlights that when peers are assessing contributions to teamwork they are assessing skills and qualities in their teammates other than overall academic ability or the ability to design well. Whilst this study is largely located within the field of design, the findings are relevant to any group work where teachers aim to design assessment that unravels group and individual contribution.

The devil in high heels : drugs, symbolism and Kate Moss

This paper contributes to critical voices on the issue of organisational responses to employee drug use. It does so by exploring symbolic readings of organisations’ relations with drugs and drug-taking. Our focus is recent coverage of, and organisational responses to, the UK tabloid media’s exposé of fashion supermodel Kate Moss’s alleged cocaine use. We consider that the celebrity endorsement in this particular case highlights the ambiguities created by the symbolic associations between the organisation and the ‘image’ projected by the celebrity. Overall, we use this case to explore symbolic relationships between drugs, sex, femininity and organisation. Through highlighting these connections, we question further the rationality of organisational responses to employee drug use and, utilising Derrida’s (1981) extension of Plato’s notion of the pharmakon, consider whether workforce drug testing might be fruitfully seen as a symbolic mechanism for scapegoating and sacrifice in order to protect the organisation’s (masculine) moral order.

The devil in high heels : drugs, symbolism and Kate Moss

This paper contributes to critical voices on the issue of organisational responses to drugs and employee drug use. It does so by exploring some of the symbolism residing at the heart of organisations’ relations with drugs and drug taking. Our focus is recent media coverage of, and organisational responses to, the UK tabloid media’s exposé of fashion supermodel Kate Moss’s cocaine use. We use this case to explore symbolic relationships between drugs, sex and femininity, and organisation. Through highlighting these symbolic connections we question further the rationality of organisational responses to the ‘spectre’ of drugs and the issue of employee drug use. We conclude by suggesting that workforce drug testing regimes might be fruitfully seen as mechanisms for scapegoating and sacrifice in order to protect the organizational moral order.

B-cell loss and B-cell apoptosis in human type 2 diabetes are related to islet amyloid deposition

Amyloid deposition and reduced β-cell mass are pathological hallmarks of the pancreatic islet in type 2 diabetes; however, whether the extent of amyloid deposition is associated with decreased β-cell mass is debated. We investigated the possible relationship and, for the first time, determined whether increased islet amyloid and/or decreased β-cell area quantified on histological sections is correlated with increased β-cell apoptosis. Formalin-fixed, paraffin-embedded human pancreas sections from subjects with (n = 29) and without (n = 39) diabetes were obtained at autopsy (64 ± 2 and 70 ± 4 islets/subject, respectively). Amyloid and β cells were visualized by thioflavin S and insulin immunolabeling. Apoptotic β cells were detected by colabeling for insulin and by TUNEL. Diabetes was associated with increased amyloid deposition, decreased -cell area, and increased β-cell βapoptosis, as expected. There was a strong inverse correlation between β-cell area and amyloid deposition (r=0.42, P < 0.001). β-Cell area was selectively reduced in individual amyloid-containing islets from diabetic subjects, compared with control subjects, but amyloid-free islets had β-cell area equivalent to islets from control subjects. Increased amyloid deposition was associated with β-cell apoptosis (r= 0.56, P < 0.01). Thus, islet amyloid is associated with decreased β-cell area and increased β-cell apoptosis, suggesting that islet myloid deposition contributes to the decreased β-cell mass that characterizes type 2 diabetes.

A layered-encoding cascade optimization approach to product-mix planning in high-mix-low-volume manufacturing

High-mix-low-volume (HMLV) production is currently a worldwide manufacturing trend. It requires a high degree of customization in the manufacturing process to produce a wide range of products in low quantity in order to meet customers' demand for more variety and choices of products. Such a kind of business environment has increased the conversion time and decreased the production efficiency due to frequent production changeover. In this paper, a layered-encoding cascade optimization (LECO) approach is proposed to develop an HMLV product-mix optimizer that exhibits the benefits of low conversion time, high productivity, and high equipment efficiency. Specifically, the genetic algorithm (GA) and particle swarm optimization (PSO) techniques are employed as optimizers for different decision layers in different LECO models. Each GA and PSO optimizer is studied and compared. A number of hypothetical and real data sets from a manufacturing plant are used to evaluate the performance of the proposed GA and PSO optimizers. The results indicate that, with a proper selection of the GA and PSO optimizers, the LECO approach is able to generate high-quality product-mix plans to meet the production demands in HMLV manufacturing environments.

Crossing the line : collusion or collaboration in university group work?

In both policy and practice, collusion is a perplexing area of academic integrity. Students are expected to learn to work collaboratively in university courses, yet are often required to submit assessment tasks as individuals whilst in group-work situations. This paper discusses the tension between 'collaboration' and 'collusion' in group-work and the consequences for crossing the line. Adopting a theoretical framework from Bourdieu's work (Bourdieu and Passeron, 1971; Bourdieu, 1991) on symbolic power, the notion of legitimate voice and intertextuality, this paper outlines the effects on the academic identities of 17 students found 'guilty' of collusion in one Australian university. In addition, 34 staff involved in formal disciplinary procedures were interviewed. The findings indicate that collusion is a fraught notion and not approached systematically across the university, nor with any degree of confidence by staff or students. The delineation between 'acceptable collaboration' and 'collusion' appears to be founded in shifting sands, with negative attitudes towards collaborative tasks being the main lesson learned by students.

Multiscale modelling of stress and strain partitioning in high strength dual phase steels

Multiscale modelling of stress and strain partitioning in DP steel was carried out using both realistic microstructure-based RVE models as well as stochastic microstructures generated by Monte Carlo method. The stochastic microstructure models were shown to resemble that of realistic microstructures, enabling research on the specific aspects of the microstructure that could be difficult to control and study during experimental work. One such feature of the realistic microstructures studied in this work was the grain size and microstructure morphology. The microstructures were generated with varying average grain sizes while all other parameters, such as boundary conditions, material properties and volume fractions of martensite and ferrite were kept constant. It is found that the effect of grain size is much more pronounced during the initial localisation of the plastic deformation at and around the interface of the phases. In addition, the decrease in ductility and increase in strength of the DP steels are directly related to the refinement of grain sizes of each phase and the stress-strain partitioning in between them.

A framework for visual and haptic collaboration in shared virtual spaces

We propose a framework for visual and haptic collaboration in X3D/VRML shared virtual spaces. In this collaborative framework, two pipelines— visual and haptic—complement each other to provide a simple and efficient solution to problem requiring collaboration in shared virtual spaces on the web. We consider shared objects defined as virtual object with their visual and physical properties rendered synchronously on each client computer. We introduce virtual tools which are shared objects associated with interactive and haptic devices. We implemented the proposed ideas as a server-client framework with a dedicated viewer. We discuss two implementation frameworks based on the strong and thin server concepts.