Cavitation Number as a Function of Disk Cavitator Radius: a Numerical Analysis of Natural Supercavitation

Due to the greater viscosity and density of water compared to air, the maximum speed of underwater travel is severely limited compared to other methods of transportation. However, a technology called supercavitation – which uses a disk-shaped cavitator to envelop a vehicle in a bubble of steam – promises to greatly decrease skin friction drag. While a large cavitator enables the occurrence of supercavitation at low velocities, it adds substantial unnecessary drag at higher speeds. Based on CFD results, a relationship between cavitator diameter and cavitation number is developed, and it is substituted into an existing equation relating drag coefficient to cavitation number. The final relationship predicts drag from cavitator radius fairly well, with an absolute error less than 5.4% at a cavitator radius above 14.14mm and as low as 1.3% at the maximum tested radius of 22.5mm

Responding to class theft: Theoretical and empirical links to critical management studies

Redrafted submission for inclusion in Remarx Section of Rethinking MarxismThis paper suggests closer linkages between the fields of Postmodern Class Analysis (PCA) and Critical Management Studies (CMS)2 are possible. It argues that CMS might contribute to the empirical engagement with the over-determined relations between class and non-class processes in work organizations (this appears to have received relatively little attention in PCA) and that PCA's theoretical and conceptual commitments may provide one means for CMS to engage in class analysis. CMS's focus on power and symbolic relations has led to the relative neglect of exploitation and class, in surplus terms. Both fields share similar although not identical political and ethical commitments

The organization of organizational discourse

Discourse, as Fairclough, Graham, Lemke, and Wodak (2004) noted in the introduction to their new journal, Critical Discourse Studies, is now well established as a category in social sciences. And yet, as they also note, we find significant differences as to what discourse and discourse analysis refer. These differences are, they argue, because of different theoretical, academic, and cultural traditions and how these traditions "push discourse in different directions" (2004:4). In this review essay I sketch out the key direction that discourse has been pushed or pulled in organization studies. To set the scene, I review two books that seek to advance our understanding of discourse and language analysis in organization studies. Each has its strengths, but both are relatively disengaged from the journal literature in the same field. In response to this weakness, I present a brief, citation-based examination of discourse analysis in the management and organization studies field. This analysis brings to light eight different streams of work that are underway

The Lincoln Repository advocacy leaflet

The University of Lincoln is an online archive hosting teaching and learning materials created by staff, and the full text of published research carried out by academic staff at the University

Neil Bottle exhibition catalogue

Neil Bottle exhibition catalogue with a critical review by Sue Prichard, Curator of Fashion and Textiles at The Victoria and Albert Museum in London. The text is in Welsh and English. The exhibition took place during September 2010 at the Ruthin Craft Centre, Denbighshire, Wales

Circular 116

Free-range reindeer in western Alaska are managed for both velvet antler and meat production. Optimal management should maximize the income generated from both meat and antler production while managing the herd at levels below the carrying capacity of the range. Meat production precludes future antler production from harvested animals, therefore harvest decisions should reflect antler and body growth rates, current antler and meat prices, natural survival rates, and population demographics. We present a user-friendly computer model to generate estimates of net income under different harvest levels and market conditions. Input variables include sex- and agespecific survival rates, harvest levels, castration rates, antler weights, body weights, and recapture rates, as well as reproductive rates, fixed and variable costs, antler price, and meat price. Mark—Recapture analysis was used to estimate survival rates. The model was calibrated using reindeer herd records from 1984-1997. Output includes changes in herd size and composition over a thirty-year period, meat production, antler production, female: male ratio, and predicted net income. The model illustrates the sensitivity of herd size to female adult survival rates

Evaluation of an automated karyotyping system for chromosome aberration analysis

Chromosome aberration analysis is a promising complement to conventional radiation dosimetry, particularly in the complex radiation fields encountered in the space environment. The capabilities of a recently developed automated karyotyping system were evaluated both to determine current capabilities and limitations and to suggest areas where future development should be emphasized. Cells exposed to radiometric chemicals and to photon and particulate radiation were evaluated by manual inspection and by automated karyotyping. It was demonstrated that the evaluated programs were appropriate for image digitization, storage, and transmission. However, automated and semi-automated scoring techniques must be advanced significantly if in-flight chromosome aberration analysis is to be practical. A degree of artificial intelligence may be necessary to realize this goal

The effects of team-skills training on transactive memory and performance

The existence of effective Transactive Memory Systems (TMS) in teams has been found to enhance task performance. Methods of developing Transactive Memory (TM) are therefore an important focus of research. This study aimed to explore one such method, the use of a generic team-skills training programme to develop TM and subsequent task performance. Sixteen three-member teams were all trained to complete a complex collaborative task, prior to which half the teams (n=8), completed a team-skills training programme. Results confirmed that those teams who had been trained to develop a range of team skills such as problem-solving, interpersonal relationships, goal setting and role allocation, evidenced significantly higher team skill, TM and performance than those who were not trained in such skills. Results are discussed with reference to the wider TM literature and the mechanisms through which team-skills training could facilitate the more rapid development of TM