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  2. Engine pressure ratio - Wikipedia

    en.wikipedia.org/wiki/Engine_pressure_ratio

    The engine pressure ratio (EPR) is the total pressure ratio across a jet engine, measured as the ratio of the total pressure at the exit of the propelling nozzle divided by the total pressure at the entry to the compressor. [1] Jet engines use either EPR or compressor/fan RPM as an indicator of thrust. [2]

  3. Electron paramagnetic resonance - Wikipedia

    en.wikipedia.org/wiki/Electron_paramagnetic...

    Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectroscopy is a method for studying materials that have unpaired electrons. The basic concepts of EPR are analogous to those of nuclear magnetic resonance (NMR), but the spins excited are those of the electrons instead of the atomic nuclei. EPR spectroscopy is particularly ...

  4. Jet engine performance - Wikipedia

    en.wikipedia.org/wiki/Jet_engine_performance

    The type of jet engine used to explain the conversion of fuel into thrust is the ramjet.It is simpler than the turbojet which is, in turn, simpler than the turbofan.It is valid to use the ramjet example because the ramjet, turbojet and turbofan core all use the same principle to produce thrust which is to accelerate the air passing through them.

  5. Engine-indicating and crew-alerting system - Wikipedia

    en.wikipedia.org/wiki/Engine-indicating_and_crew...

    EICAS typically includes instrumentation of various engine parameters, including for example speed of rotation, temperature values including exhaust gas temperature, fuel flow and quantity, oil pressure etc.

  6. VICI Properties vs. EPR Properties: Which High-Yield ... - AOL

    www.aol.com/vici-properties-vs-epr-properties...

    But EPR had to cut its dividend during the pandemic. The big culprit was its movie theater exposure, as movie chains weren't in a particularly strong state entering the global health crisis. Given ...

  7. Pulsed electron paramagnetic resonance - Wikipedia

    en.wikipedia.org/wiki/Pulsed_electron...

    Spin echo animation showing the response of electron spins (red arrows) in the blue Bloch sphere to the green pulse sequence. Pulsed electron paramagnetic resonance (EPR) is an electron paramagnetic resonance technique that involves the alignment of the net magnetization vector of the electron spins in a constant magnetic field.

  8. National Institute of Aerospace - Wikipedia

    en.wikipedia.org/wiki/National_Institute_of...

    NIA was formed in 2002 by a consortium of research universities. NIA performs research in a broad range of disciplines including space exploration, systems engineering, nanoscale materials science, flight systems, aerodynamics, air traffic management, aviation safety, planetary and space science, and global climate change.

  9. ecoDemonstrator - Wikipedia

    en.wikipedia.org/wiki/EcoDemonstrator

    The ecoDemonstrator Program is a Boeing flight test research program, which has used a series of specially modified aircraft to develop and test aviation technologies designed to improve fuel economy and reduce the noise and ecological footprint of airliners.