A fluid dynamic investigation of the Big Blade and Macon oar blade designs in rowing propulsion

The purpose of this investigation was to examine the fluid dynamic characteristics of the two most commonly used oar blades: the Big Blade and the Macon. Scaled models of each blade, as well as a flat Big Blade, were tested in a water flume using a quasi-static method similar to that used in swimming and kayaking research. Measurement of the normal and tangential blade forces enabled lift and drag forces generated by the oar blades to be calculated over the full range of sweep angles observed during a rowing stroke. Lift and drag force coefficients were then calculated and compared between blades. The results showed that the Big Blade and Macon oar blades exhibited very similar characteristics. Hydraulic blade efficiency was not therefore found to be the reason for claims that the Big Blade could elicit a 2% improvement in performance over the Macon. The Big Blade was also shown to have similar characteristics to the flat plate when the angle of attack was below 90 degrees , despite significant increases in the lift coefficient when the angle of attack increased above 90 degrees . This result suggests that the Big Blade design may not be completely optimized over the whole stroke.     

The information needs of perioperative staff: a preparatory study for a proposed specialist library for theatres (NeLH)

AIMS/OBJECTIVES: To undertake an information-needs analysis of operating theatre staff in order to inform the development of a specialist library of the National Electronic Library of Health (NeLH). SETTING: Three hospitals in an NHS Trust in a rural county in the north of England. METHODS: In-depth interviews, during which staff were questioned in regard to their job roles and information needs, information-seeking behaviour, access to computers, use and perceptions of the NeLH, and what they would like from a specialist library. RESULTS: Information needs were found to concern direct care, professional and academic development, medical devices knowledge and administration. Currency and speed of delivery were the key information requirements. Poor communication appeared to be a major problem for many staff and inhibited efficient information exchange. When using the Web, both clinical and non-clinical staff searched in a similar fashion to health consumers generally, despite their need for highly specialist information. Most respondents reacted warmly to the idea of the proposed National Electronic Library for Theatre Staff (NeLTS) and made several practical suggestions for suitable material. However, access was problematic for nurses and might prove to be an obstacle to take-up of the Specialist Library. CONCLUSIONS: Communication difficulties, the fragmentation of data in the field and the consequent difficulties of finding information point to the need for an NeLTS. However, for this library to embrace and succeed with all the various groups that constitute the operating theatre staff, issues of access and digital literacy need to be addressed.     

The reality of friendship within immersive virtual worlds

In this article I examine a recent development in online communication, the immersive virtual worlds of Massively Multiplayer Online Role-Playing Games (MMORPGs). I argue that these environments provide a distinct form of online experience from the experience available through earlier generation forms of online communication such as newsgroups, chat rooms, email and instant messaging. The experience available to participants in MMORPGs is founded on shared activity, while the experience of earlier generation online communication is largely if not wholly dependent on the communication itself. This difference, I argue, makes interaction in immersive virtual worlds such as MMORPGs relevantly similar to interaction in the physical world, and distinguishes both physical world and immersive virtual world interaction from other forms of online communication. I argue that to the extent that shared activity is a core element in the formation of friendships, friendships can form in immersive virtual worlds as they do in the physical world, and that this possibility was unavailable in earlier forms of online interaction. I do, however, note that earlier forms of online interaction are capable of sustaining friendships formed through either physical or immersive virtual world interaction. I conclude that we cannot any longer make a sharp distinction between the physical and the virtual world, as the characteristics of friendship are able to be developed in each.     

Self-Initiated Learning Activities of Experienced Public School Teachers: Methods,sources, and relevant organizational influences

The self-initiated learning activities of experienced public school teachers are examined in this study. Twenty-two experienced teachers were interviewed to develop a greater understanding of the types of self-initiated learning activities in which they engage and the organizational characteristics that influence their participation in those activities. Analysis of the data showed that experienced teachers engaged in three types of self-initiated learning activities: knowledge exchanging, experimenting, and environmental scanning. Participation in these activities was influenced by the availability of resources, physical layout, and level of centralization in their schools. Implications of these findings for theory, practice, and future research in teacher learning and development are discussed.