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Other common features include height adjustment and tilting the bed to raise the upper body or the lower body into the Trendelenburg or reverse Trendelenburg positions. [2] The market for motorized adjustable bed bases is expanding, as the mattress industry has begun to heavily promote them to consumers as a comfort and lifestyle choice. [3]
Concept of a rotating chair with swivel wheels from Löffelholz-codex from Nuremberg, Germany, dated 1505 An old swivel chair. An earlier prototype of a swivel chair dates back to a 1505 illustrated manuscript from a German noble named Martin Löffelholz von Kolberg. He conceived of a chair that could twist on its legs and adjust its height. [4]
A bed base, sometimes called a foundation, is the part of a bed that supports the mattress. The bed base can itself be held in place and framed by the bedstead ( bed frame ). In the United States, box-spring bed bases are very common (to the point where 'bed base' and 'box spring' may be used synonymously, and the term "platform bed" is used ...
An inverted pendulum in which the pivot is oscillated rapidly up and down can be stable in the inverted position. This is called Kapitza's pendulum, after Russian physicist Pyotr Kapitza who first analysed it. The equation of motion for a pendulum connected to a massless, oscillating base is derived the same way as with the pendulum on the cart.
where for every direction in the base space, S n, the fiber over it in the total space, SO(n + 1), is a copy of the fiber space, SO(n), namely the rotations that keep that direction fixed. Thus we can build an n × n rotation matrix by starting with a 2 × 2 matrix, aiming its fixed axis on S 2 (the ordinary sphere in three-dimensional space ...
While fiber and protein needs vary based on your size, physical activity and age, there are some basic guidelines: “Most active individuals benefit from 20 to 30 grams of protein per meal and 5 ...
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