Results 151 to 160 of about 34,549 (198)
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The Physics Teacher, 2013
Consider a skier who goes down a takeoff ramp, attains a speed V, and jumps, attempting to land as far as possible down the hill below (Fig. 1). At the moment of takeoff the angle between the skier's velocity and the horizontal is α. What is the optimal angle α that makes the jump the longest possible for the fixed magnitude of the velocity V?
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Consider a skier who goes down a takeoff ramp, attains a speed V, and jumps, attempting to land as far as possible down the hill below (Fig. 1). At the moment of takeoff the angle between the skier's velocity and the horizontal is α. What is the optimal angle α that makes the jump the longest possible for the fixed magnitude of the velocity V?
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Papillomatosis cutis lymphostatica and ‘Ski‐Jump’ nails
Pediatric Dermatology, 2020AbstractPapillomatosis cutis lymphostatica is an uncommon condition usually associated with lymphedema. "Ski‐jump" nails are upward sloping concave nails that can be an important diagnostic sign which may be overlooked in the setting of lymphedema.
Dillon Mintoff +2 more
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Improved safety in ski jumping
The American Journal of Sports Medicine, 1988Among approximately 2,600 licensed Norwegian ski jumpers, only three injuries that caused a permanent medical disability of at least 10% were incurred during the 5 year period from 1982 through 1986. When compared to the previous 5 year period (1977 to 1981), a dramatic improvement in safety is seen, as both number and severity of such injuries were ...
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The American Journal of Sports Medicine, 1991
Little data are available in the medical literature on nordic ski jumping injuries. Injury questionnaires were sent to all active American ski jumpers registered either with the United States Ski Association or with a jumping club registered with the United States Ski Association.
J R, Wright +3 more
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Little data are available in the medical literature on nordic ski jumping injuries. Injury questionnaires were sent to all active American ski jumpers registered either with the United States Ski Association or with a jumping club registered with the United States Ski Association.
J R, Wright +3 more
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Serious ski jumping injuries in Norway
The American Journal of Sports Medicine, 1985Injuries caused by ski jumping have been poorly inves tigated. Among approximately 2,200 licensed jumpers in Norway, there occurred at least 12 injuries with a permanent medical disability of ≧10%. The risk of being seriously injured is approximately 5%o in a 5 year period (1977 to 1981); it is higher in the age group 15 to 17 years.
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Safety assessment of jumps in ski racing
Scandinavian Journal of Medicine & Science in Sports, 2014The influence of important parameters on the flight trajectory for jumps in downhillWorldCup races was investigated. To quantify the impact injury risk at landing, the parameter equivalent landing height (ELH) was introduced, which considered a variable slope inclination during the landing movement.
K, Schindelwig +4 more
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Numerical Simulation of Ski-Jump Hydraulic Behavior
2020The hydraulic behavior of ski jumps is investigated numerically using the OpenFOAM digital library. A number of ski-jump cases has been simulated by following the RANS approach (Reynolds Averaged Navier-Stokes equations), using the k-ω SST closure model, and the VoF technique (Volume of Fluid) for the tracking of the free surface.
Agostino Lauria, Giancarlo Alfonsi
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Spinal column damage from water ski jumping
Skeletal Radiology, 1987We conducted a radiographic survey of 117 competitive water ski jumpers to determine whether this sport can cause spinal column damage and, if so, whether damage is more likely to occur in those who participate during the period of spinal growth and development (age 15 years or younger).
J, Horne, W P, Cockshott, H S, Shannon
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Performance factors in ski jumping
Journal of Biomechanics, 2006Predominant performance factors in ski jumping are: High in-run velocity, high linear momentum perpendicular to the ramp at take-off due to the jumping movement and the utilisation of aerodynamic lift, accurate timing of the take-off jump with respect to the edge of the ramp, appropriate angular momentum at take-off in order to obtain an ...
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Biomechanical aspects of new techniques in alpine skiing and ski-jumping
Journal of Sports Sciences, 2003There have been considerable changes in equipment design and movement patterns in the past few years both in alpine skiing and ski-jumping. These developments have been matched by methods of analysing movements in field conditions. They have yielded new insights into the skills of these specific winter sports.
Müller, E., Schwameder, H.
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