نتایج جستجو برای: tailed drongo and lesser racket
تعداد نتایج: 16830951 فیلتر نتایج به سال:
The Python programming language is becoming increasingly popular in a variety of areas, most notably among novice programmers, due to its readable syntax and extensive libraries. On the other hand, the Racket language and its DrRacket IDE have a tradition for being used to introduce Computer Science concepts to students. Besides, the Racket platform can be extended to support other programming ...
Effective training to improve serve speed is important for competitive tennis players. The purposes of this study were to investigate the effects of anthropometric factors and whole body kinematics of elite players on ball speed and to propose possible training strategies for improving the quality of tennis serves. Body and racket kinematics of tennis serves of 12 male elite Hong Kong players w...
Processing is a programming language and development environment created to teach programming in a visual context. In spite of its enormous success, Processing remains a niche language with limited applicability outside the visual realm. Moreover, architects that have learnt Processing are unable to use the language with traditional Computer-Aided Design (CAD) and Building Information Modelling...
This study compared EMG activity of young tennis players' muscles during forehand drives in two groups, GD-those able to raise by more than 150% the vertical velocity of racket-face at impact from flat to topspin forehand drives, and GND, those not able to increase their vertical velocity to the same extent. Upper limb joint angles, racket-face velocities, and average EMGrms values, were studie...
This research is concerned with tracking tennis racket movements. Previously, stereo camera systems have been used to track markers attached to rackets, which allows for racket movements to be obtained in three-dimensions. Typically, markers are manually selected on the image plane but this can be time consuming and inaccurate. This paper discusses a markerless method to measure three-dimension...
This study investigates the control involved in a task where subjects rhythmically bounce a ball with a hand-held racket as regularly as possible to a prescribed amplitude. Stability analyses of a kinematic model of the ball-racket system revealed that dynamically stable solutions exist if the racket hits the ball in its decelerating upward movement phase. Such solutions are resistant to small ...
We investigate the skill of rhythmically bouncing a ball on a racket with a focus on the mathematical modeling of the stability of performance. As a first step we derive the deterministic ball bouncing map as a Poincaré section of a sinusoidally driven bouncing ball. Subsequently, we show the ball bouncing map to have a passively stable regime. More precisely, for negative racket acceleration a...
The present study aims to assess the position of racket, and racket height with respect floor, during table tennis top spin stroke. A stereophotogrammetric system (Smart-D, BTS, 8 cameras, 550 Hz) was used track cross-court (CC) long-line (LL) shots. Ten national level players completed ten CC LL strokes responding a robot machine. motion throughout shot showed specific technical characteristic...
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