منابع مشابه
Lift-off dynamics in a simple jumping robot
We study vertical jumping in a simple robot comprising an actuated mass-spring arrangement. The actuator frequency and phase are systematically varied to find optimal performance. Optimal jumps occur above and below (but not at) the robot's resonant frequency f(0). Two distinct jumping modes emerge: a simple jump, which is optimal above ff(0), is achievable with a squat maneuver, and a peculiar...
متن کاملTake-off and landing forces in jumping frogs.
Anurans use a saltatorial (jumping) mode of locomotion. A jumping cycle can be divided into four subphases: propulsion, flight, landing and recovery. We studied the landing phase during locomotion in Rana esculenta by measuring the ground reaction forces during propulsion and landing over a range of distances. Landing performance affects locomotor ability in jumping frogs. Landing and recovery ...
متن کاملAcquisition of Off-Screen Object by Predictive Jumping
We propose predictive jumping (PJ), a fast and efficient algorithm that enables user navigation to off-screen targets. The algorithm is inspired by Delphian Desktop [1] and the off-screen visualization technique–Halo [2]. The Halos represented at the edge of the viewport help users estimate off-screen target distance and encourage them to make a single fluid mouse movement toward the target. Ha...
متن کاملOn the Roles of Bi-articular Muscles during the Jumping Movements with Various Take-off Angles
Many studies on maximal vertical jumps have been done in order to clarify the way human exerts ballistic movements (Bobbert and Ingen Schenau, 1988). However, humans often perform jumps with various take-off angles in various situations and the different muscular and segmental coordination may be involved in the jumps with the different take-off angles. For these reasons, it is necessary to inv...
متن کاملBreaking the Azimuthal Symmetry- Jumping off-axis or Staying Away from the Axis?
We performed experiments with electrons in a Malmberg-Penning trap, as well as 2D fluid simulations, and found conditions that lead to off-axis equilibrium states. We found that unstable initial distributions whose average distance from the axis is larger than about half the wall radius end up in off-axis states. These states consist of a small strong vortex and a large diffuse background, each...
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ژورنال
عنوان ژورنال: Science
سال: 2010
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.327.5964.394-d