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Deck prism. A deck prism, or bullseye, is a prism inserted into the deck of a ship to provide light down below. [1] [2] [3] For centuries, sailing ships used deck prisms to provide a safe source of natural sunlight to illuminate areas below decks. Before electricity, light below a vessel's deck was provided by candles, oil and kerosene lamps ...
The end of train device ( ETD ), sometimes referred to as an EOT, flashing rear-end device ( FRED) or sense and braking unit ( SBU) is an electronic device mounted on the end of freight trains in replacement of a caboose. They are divided into three categories: "dumb" units, which only provide a visible indication of the rear of the train with ...
Slingshot. Slingshot is a water purification device created by inventor Dean Kamen. [1] Powered by a Stirling engine running on a combustible fuel source, it claims to be able to produce drinking water from almost any source [2] by means of vapor compression distillation, [3] requires no filters, and can operate using cow dung as fuel.
Electrotherapy is the use of electrical energy as a medical treatment. [1] In medicine, the term electrotherapy can apply to a variety of treatments, including the use of electrical devices such as deep brain stimulators for neurological disease. The term has also been applied specifically to the use of electric current to speed wound healing ...
Betavoltaic device. A betavoltaic device ( betavoltaic cell or betavoltaic battery) is a type of nuclear battery which generates electric current from beta particles ( electrons) emitted from a radioactive source, using semiconductor junctions. A common source used is the hydrogen isotope tritium. Unlike most nuclear power sources which use ...
The Šidák correction is derived by assuming that the individual tests are independent. Let the significance threshold for each test be α 1 {\displaystyle \alpha _{1}} ; then the probability that at least one of the tests is significant under this threshold is (1 - the probability that none of them are significant).
Front view of a pre-moulded plastic back brace with nylon torso and shoulder straps made for a female adolescent or pre-adolescent patient. A back brace is a device designed to limit the motion of the spine in cases of bone fracture or in post-operative spinal fusiona, as well as a preventative measure against some progressive conditions or to correct patient posture.
The cost of a frame itself was around 2,500 pounds sterling in 2006, though this cost will vary depending on the number of components in the frame. Cases involving treatment of nonunion of fracture are complicated and time-consuming with costs of around 30,000 pounds sterling in 2006 [4] and treatment can take between 1 and 2 years.