The term stress fracture, in many cases of overuse injury, is a misnomer. This term does not represent the nature and diversity of this frequently found injury. The term, âChronic Repetitive Stress Injury of Boneâ, better suits this injury in its myriad manifestations.he higher grades of stress injury are similar to fatigue fractures of other materials. Bone is noted to fail more readily in tension than in compression. This means that the forces which tend to âpullâ are more dangerous to bone failure and injury than compressive forces.
Wind power or wind energy describes the process by which the wind is used to generate mechanical power or electricity. Wind turbines convert the kinetic energy in the wind into mechanical power.
Wind power has been used as long as humans have put sails into the wind. For more than two millennia wind-powered machines have ground grain and pumped water. Wind power was widely available and not confined to the banks of fast-flowing streams, or later, requiring sources of fuel.n Denmark wind power was an important part of a decentralized electrification in the first quarter of the 20th century, partly because of Poul la Cour from his first practical development in 1891 at Askov. By 1908 there were 72 wind-driven electric generators from 5 kW to 25 kW.