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In plumbing, a trap is a U-shaped portion of pipe designed to trap liquid or gas to prevent unwanted flow; most notably sewer gases from entering buildings while allowing waste materials to pass through. In oil refineries, traps are used to prevent hydrocarbons and other dangerous gases and chemical fumes from escaping through drains.
A pan trap with a number of insects having been attracted to it. A pan trap is a type of insect trap used to sample the abundance and diversity of insects, primarily used to capture small Hymenoptera. [1] Pan traps are typically constructed with a bowl with shallow sides filled with water and soap or a preservative and killing agent.
In solid-state physics, the Poole–Frenkel effect (also known as Frenkel–Poole emission [1]) is a model describing the mechanism of trap-assisted electron transport in an electrical insulator. It is named after Yakov Frenkel, who published on it in 1938, [2] extending the theory previously developed by H. H. Poole.
Deep-level traps or deep-level defects are a generally undesirable type of electronic defect in semiconductors.They are "deep" in the sense that the energy required to remove an electron or hole from the trap to the valence or conduction band is much larger than the characteristic thermal energy kT, where k is the Boltzmann constant and T is the temperature.
Trap emission is a multistep process wherein a carrier falls into defect-related wave states in the middle of the bandgap. A trap is a defect capable of holding a carrier. The trap emission process recombines electrons with holes and emits photons to conserve energy. Due to the multistep nature of trap emission, a phonon is also often emitted.
1. A deliberate deep breathing to reduce blood carbon dioxide level to extend the duration of a free dive. 2. Rapid breathing as the body's response to hypercapnia. 3. Rapid, often shallow breathing, associated with panic. hyperventilation-induced blackout See: underwater blackout syndrome hypocapnia. Main article: Hypocapnia
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