In 1799, Laplace derived the system of differential equations (now called Liouville-Euler) that fully describes motions rotation axis any celestial body. showed only gravitational forces and kinetic moments from other bodies influence one them. The involve three Euler angles specify a body's axis; they can be reduced to two for inclination time derivative declination axis. existence forced annu...

This Paper is about landing control of legged robot. Body stiffness and damping is used as landing strategy of a legged robot. First, we only used stiffness control method to control legged robot landing. Second control method,sliding mode controller and feedback linearization controller is applied to enhance position control performance. Through these control algorithm, body center of gravity ...

background: to explain the role of arthroscopic release in intractable frozen shoulders. we used different questionnaires and measuring tools to understand whether arthroscopic release is the superior modality to treat patients with intractable frozen shoulders. methods: between 2007 and 2013, in a prospective study, we enrolled 80 patients (52 females and 28 males) with recalcitrant frozen sho...

A frozen shoulder is a common cause of a painful and stiff shoulder. A web-based survey was conducted to obtain insight in the current preferences about the diagnosis and treatment of a frozen shoulder. A response rate of 54% was reached among shoulder specialized orthopaedic surgeons from the Netherlands and Belgium. Non-steroidal anti-inflammatory drugs and intra-articular corticosteroid inje...

background: . the aim of this study was to investigate of relationship of musculoskeletal symptoms with weight of backpack in tehran secondary school students. methods: this cross-sectional study was performed in the city of tehran in 2009. two hundred thirteen students partici­pated in study. nordic musculoskeletal questionnaire was used, asking about complaints of back, neck, and/or shoulders...