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A Winston cone is a non-imaging light collector in the shape of an off-axis parabola of revolution [1] [2] with a reflective inner surface. It concentrates the light passing through a relatively large entrance aperture through a smaller exit aperture. [ 3 ]
Before Dawn may refer to: Before Dawn (horse) (1979–2006), American racehorse Before Dawn: The Music of Yusef Lateef , a 1957 American jazz album featuring Yusef Lateef
[citation needed] Before the advent of high-intensity light-emitting diode (LED) illumination with lithium-ion batteries, carbide also had two important advantages over the alternative of miners electric lamps. Miner's lamps were intended to last for the duration of a standard working shift, whilst major caving explorations could be much longer ...
Solar Energy Generating Systems (SEGS) is a concentrated solar power plant in California, United States.With the combined capacity from three separate locations at 354 megawatt (MW), it was for thirty years the world's largest solar thermal energy generating facility, until the commissioning of the even larger Ivanpah facility in 2014.
All rays now miss the receiver and all light is lost. Therefore, for incidence angles α < θ all light is captured while for incidence angles α > θ all light is lost. The concentrator is then said to have a (half) acceptance angle θ, or a total acceptance angle 2θ (since it accepts light within an angle ±θ to the optical axis).
Taking as event p a flash of light (light pulse) at time t 0, all events that can be reached by this pulse from p form the future light cone of p, while those events that can send a light pulse to p form the past light cone of p. Given an event E, the light cone classifies all events in spacetime into 5 distinct categories:
NASA patented a type of solar-powered Stirling engine on August 3, 1976. It used solar energy to pump water from a river, lake, or stream. [1] The purpose of this apparatus is to “provide a low-cost, low-technology pump having particular utility in irrigation systems employed in underdeveloped arid regions of the earth…[using] the basic principles of the Stirling heat engine“.