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| Occupancy ratio
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The ratio of rented or leased space to the total amount of space available. |
| Occupancy sensor
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An optical, ultrasonic, or infrared sensor that turns room lights on when they detect a person's presence and off after the space is vacated. |
| Occupational safety and health administration (osha)
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The regulatory arm of the US Department of Labor, which promulgates safety and health standards, facilitates training programs, and enforces regulations on work sites. OSHA has developed permissible exposure limits for over 600 contaminants present in the industrial workplace. |
| Occupied space
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The space within a building or structure that is normally occupied by people, and that may be conditioned (heated, cooled and/or ventilated). |
| Ocean energy efficiency systems
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Energy conversion technologies that harness the energy in tides, waves, and thermal gradients in the oceans. |
| Ocean thermal energy efficiency conversion (otec)
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The process or technologies for producing energy by harnessing the temperature differences (thermal gradients) between ocean surface waters and that of ocean depths. Warm surface water is pumped through an evaporator containing a working fluid in a closed Rankine-cycle system. The vaporized fluid drives a turbine/generator. Cold water from deep below the surface is used to condense the working fluid. Open-Cycle OTEC technologies use ocean water itself as the working fluid. Closed-Cycle OTEC systems circulate a working fluid in a closed loop. A working 10 kilowatt, closed-cycle prototype was developed by the Pacific International Center for High Technology Research in Hawaii with U.s. Department of Energy funding, but was not commercialized. |
| Octagon
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An eight-sided polygon. |
| Octagon box
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An eight-sided box used in electrical work. Used as a junction box or to support outlets and fixtures. |
| Octahedron
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An object with eight surfaces. |
| Off-center
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Not centered. Situated off to one side. |
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