David Hulse

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[1] Water scarcity may appear to be a simple concept, but it can be difficult to apply to complex natural-human systems. While aggregate scarcity indices are straightforward to compute, they do not adequately represent the spatial and temporal variations in water scarcity that arise from complex systems interactions. The uncertain effects of future climate(More)
beta-Tricalcium phosphate (TCP) was evaluated as a synthetic bone grafting material in horses. Sixteen horses were randomly assigned to 4 groups of 4 horses. In each horse, an 11-mm by 10-mm circular defect with a smooth margin was created surgically in the weight-bearing surface of both third metacarpal bones (McIII) and the left third metatarsal bone. The(More)
SUMMARY Since the 1980s, various groups have been constructing systems that support a concept known as orthogonal persistence. These systems support objects whose lifetime is independent of the context in which they were created. The benefits of such systems include greater run-time efficiency, strong semantic guarantees about the existence of data and its(More)
Persistent stores have been implemented using a variety of storage technologies including shadow paging, log-based and log-structured approaches. Here we compare these approaches and advocate the use of log-structuring. The advantages of such a technique include efficient support for large (64 bit) address spaces, scalability and fast snapshot processing.(More)
O PERATING systems manage a computer's resources, maintain its permanent data, and provide an efficient environment for the execution of user programs. Users expect an operating system to provide a certain level of resilience to failure and facilities for recovering from failure with minimal interruption of computations and minimal loss of data. In(More)
Chronic exertional compartment syndrome (CECS) was first described in 1956, 1 but little research has been performed since then to confirm the pathological physiology. An assumption is made that elevated subfascial or intramuscular pressure during exercise causes tissue hypoxia and subsequent ischaemic pain due to decreased blood flow. 2 To date, no(More)
OBJECTIVE Shoulder instability is a common cause of morbidity among professional rugby union players. This study explores whether the risk of shoulder dislocation is associated with innate shoulder laxity. DESIGN Retrospective cohort study. SETTING Clinical sports medicine research at professional rugby clubs. PARTICIPANTS One hundred sixty-nine(More)
Funding for conservation is limited, and its investment for maximum conservation gain can likely be enhanced through the application of relevant science. Many donor institutions support and use science to pursue conservation goals, but their activities remain relatively unfamiliar to the conservation-science community. We examined the priorities and(More)
Over the last 15 years a number of persistent language systems have been produced whose implementation relies on the persistence mechanisms provided by an underlying operating system. We have produced an operating system called Grasshopper expressly designed to support orthogonally persistent systems. In this paper we demonstrate how the mechanisms provided(More)