lifetime

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lifetime

1. 
a. the length of time a person or animal is alive
b. (as modifier): a lifetime supply
2. Physics the average time of existence of an unstable or reactive entity, such as a nucleus, excited state, elementary particle, etc.; mean life

Lifetime

 

in physics, the average duration τ of existence of (1) excited states of atoms and molecules, which end with the spontaneous transition of particles to a less excited or basic (unexcited) state; the lifetime is an important characteristic of the energy levels of particles (the lifetime on a level); (2) unstable (radioactive) atomic nuclei as well as elementary particles; their lifetime is linked with their half-life period T by the formula τ = T/In 2; and (3) quasiparticles (elementary excitations) in solids and in liquid helium, particularly electrons and holes in semiconductors.

lifetime

[′līf‚tīm]
(physics)
References in periodicals archive ?
Wall losses are minimized by the use of "low-temperature Fomblin," and the notoriously difficult extrapolation from storage lifetimes to [[tau].
9], storage lifetimes were measured together with the flux of UCN thermally up-scattered at the trap walls.
National Instruments (Nasdaq:NATI) today announced The LEGO Company uses the NI LabVIEW graphical development environment and NI PCI-based data acquisition boards in its quality assurance department to test and optimize the lifetimes of its electric motor-based products, including popular toys ranging from race cars to speedboats and the new out-door RC-car "Dirt Crushers.
Before we incorporated LabVIEW, our engineers waited weeks before they could analyze lifetime-test results after making mechanical adjustments to a product, but we now can obtain error-free feedback from these modifications in a matter of days and quickly make decisions for optimizing the motor and lifetimes.
and Batelle Pacific Northwest National Labs, had demonstrated 3000 hours of lifetime on a Flexible Glasstm barrier coated plastic substrate with a rigid lid, showing additional progress in the use of barrier coated plastic for use in flexible OLED (FOLEDtm) devices.
But extending lifetimes much beyond 10,000 hours will require a significant technology breakthrough that we cannot identify.
The stochastic process produces a very broad distribution of potential lifetimes as shown in "Lifetime Possibilities" (page 102).
The lifetime of removable media is defined as the length of time that the media can be successfully written to, stored and successfully read.
H and W want to retain their current standard of living and cash flow throughout their lifetimes.
Iron molds are less durable with typical designed lifetimes of 40,000 castings and may be serviceable to 50,000 shots.
Under the terms of this Cooperative Research and Development Agreement (CRADA), eMagin and NVESD will develop better ways to assess the applicability of active matrix OLED displays in military systems on the basis of their usable lifetimes.
We report progress on an experiment to measure the neutron lifetime using magnetically trapped neutrons.