17 research outputs found
The use of geophysical equipment in hydrogeologic investigations, and the measurement of stream discharge
Guidebook for field trips in southwestern Maine: New England Intercollegiate Geological Conference, 78th annual meeting, Bates College, Lewiston, Maine, October 17, 18, and 19, 1986: Trip A-
Low-intensity wheelchair training in inactive people with long-term spinal cord injury: A randomized controlled trial on fitness, wheelchair skill performance and physical activity levels
Objective: To investigate the effects of low-intensity wheelchair training on wheelchair-specific fitness, wheelchair skill performance and physical activity levels in inactive people with long-term spinal cord injury. Design: Randomized controlled trial. Participants: Inactive manual wheelchair users with spinal cord injury for at least 10 years (n = 29), allocated to exercise (n = 14) or no exercise. Methods: The 16-week training consisted of wheelchair treadmill-propulsion at 30-40% heart rate reserve or equivalent in terms of rate of perceived exertion, twice a week, for 30 min per session. Wheelchair-specific fitness was determined as the highest 5-s power output over 15-m overground wheelchair sprinting (P5-15m), isometric push-force, submaximal fitness and peak aerobic work capacity. Skill was determined as performance time, ability and strain scores over a wheelchair circuit. Activity was determined using a questionnaire and an odometer. Results: Significant training effects appeared only in P5-15m (exercise vs control: mean +2.0 W vs -0.7 W, p = 0.017, ru=0.65). Conclusion: The low-intensity wheelchair training appeared insufficient for substantial effects in the sample of inactive people with long-term spinal cord injury, presumably in part owing to a too-low exercise frequency. Effective yet feasible and sustainable training, as well as other physical activity programmes remain to be developed for inactive people with long-term spinal cord injury. Key words: activities of daily living; paraplegia; physical activity; physical fitness; spinal cord injuries; tetraplegia; rehabilitation; wheelchairs
Observables Processing for the Helioseismic and Magnetic Imager Instrument on the Solar Dynamics Observatory
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The GE Aircraft Engine Bracket Challenge: An Experiment in Crowdsourcing for Mechanical Design Concepts
An emerging international engineering design trend has resulted from widespread use of
social media: a large number of people are engaged in collaborative engineering design activities
to build their design expertise through interaction with other designers, to compete for
recognition or prizes, or simply for the enjoyment of doing so. The term âcrowdsourcingâ was
introduced in 2005 and implies soliciting contributions from a large group of people, usually an
online community, in order to get a broad perspective from various points of view. This
community-generated creativity is contrary to conventional practice in most manufacturing
companies, which prefer tight control of engineering designs and practices because they
represent key intellectual property and know-how. Recognizing that crowdsourcing represents a
potential resource, GE embarked on an experiment to see how a for-profit company might
benefit from soliciting new design approaches from this non-traditional source. The design of a
specific part, an aircraft engine bracket, was released to an online community of engineers with
an invitation to submit improved designs in an open competition. Entrants were encouraged to
consider additive manufacturing as the fabrication method. Hundreds of designers submitted
concepts and some achieved 80% reduction in weight.Mechanical Engineerin