This paper describes a model for the study of the dynamic behavior of lifting equipments. The model here proposed allows to evaluate the fluctuations of the load arising from the elasticity of the rope and from the type of the motion command imposed by the winch. A calculation software was developed in order to determine the actual acceleration of the lifted mass and the dynamic overload inside...

Main part of crane systems in general and hoisting especially are rope-reeving systems. They used to reduce the loading on rope itself following parts hoist drive. In order transfer performance required reduced has be compensated by higher speeds. General standard reeving with just vertical orientation. have advantages, as they not difficult plan, build operate. On other hand, comprise disadvan...

background many different surgical techniques have been described to stabilize the acromion-clavicular (ac) dislocations. so far many of these procedures are performed only in arthroscopy. objectives in this study, we describe a new technique that utilizes the tightrope with a mini-invasive open approach for the acute stabilization of the acromion-clavicular joint (acj) dislocation. patients an...

Study purpose. The study purpose was to determine changes in indicators of special physical preparedness and speed attacking strokes badminton players aged 10–11 under the influence specially selected exercises. Materials methods. participants were young (12 boys), whose sports experience 2-3 years. lasted 3 months included: testing assessment analysis players. Results. Analysis results showed ...

The purpose of this study was to improve the ability pass down volleyball with target wall media. This type research is an experimental lower passing exercises using a circles and ropes on students. subjects were extracurricular students in middle-high school; all are 20 children. Based results calculation first hypothesis test, it known that there effect bottom practice rope down. second by ci...