Spinal stenosis is the narrowing of spaces in the spine (backbone) which causes pressure on the spinal cord and nerves. About 75% of cases of spinal stenosis occur in the low back (lumbar spine).
Both static and dynamic measurements can be taken. Static coefficient of friction (SCOF) is the frictional. resistance one pushes against when starting in motion. Dynamic coefficient of friction (DCOF) is the frictional resis-. tance one pushes against when already in motion. For SCOF and DCOF, a slip occurs when pushing off with more.
A shadoof is a mechanical irrigation tool that was first developed in a part of western Asia called the Fertile Crescent more than 4,000 years ago. It is still used to draw water in many parts of the world that do not have ready access to electric water pumps. This tool is also known as a shaduf, dhenkli, picottah, swape or counterpoise-lift. In many ways, a shadoof resembles a seesaw. A strong pole, often made from wood or bamboo, is suspended across an upright structure so that the fulcrum sits roughly one-fifth of the way down its length.