Heather Van Houten

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BACKGROUND Knee injuries account for approximately one third of injuries in skiers. Researchers have proposed several mechanisms of knee injury in skiers. However, the frequencies of these mechanisms have varied in different studies. PURPOSE To identify the most common knee injury mechanisms in recreational downhill skiers and to assess injury frequencies(More)
The construction of a Drew type variable shear wavefront shearing interferometer, useful for testing optical systems of large aperture and short focal length, is described. The mechanical arangement, used for adjustment of the mirrors and the dividing plate, and a novel arrangement to achieve white light compensation easily, are described. Sheared(More)
wire width of 3500 A. Clear conductance steps were observed at even higher temperatures up to 120 K. However, the conductance values at steps at those higher temperatures above 100 K do not agree with multiples of (2e2/h). This is probably due to the parasitic MESFET which turns on very weakly at high temperatures. This is to our knowledge the first(More)
Results: The overall injury distribution was valgus–external rotation (32.9%), phantom foot (22.5%), hyperextension (19.0%), boot induced (7.8%), collision (2.2%), and other (15.6%). The phantom foot mechanism was most common in ages 30 to 40 years (36.3% of all injuries within this mechanism; P < .01). Children and adults showed no significant difference(More)
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