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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]
If a spectrum of an unknown chemical compound is available, a reverse search can be carried out by entering the values of the chemical shift, frequency or mass of the peaks in the NMR, FT-IR or EI-MS spectrum respectively. This type of search affords all the chemical compounds in the database that have the entered spectral characteristics. [6]
Engine pressure ratio (EPR) differs from OPR in that OPR compares the intake pressure to the pressure of the air as it exits the compressor, and is always greater than 1 (often very much so), whereas EPR compares the intake pressure to the pressure at the engine's tailpipe (i.e., after the air has been used for combustion and given up energy to ...
The free-radical component of the EPR signal is proportional to the amount of asphaltene in the oil regardless of any solvents, or precipitants that may be present in that oil. [19] When the oil is subject to a precipitant such as hexane , heptane , pyridine however, then much of the asphaltene can be subsequently extracted from the oil by ...
An EPR spectrometer used for spin-trapping technique. Spin trapping is an analytical technique employed in chemistry [ 1 ] and biology [ 2 ] for the detection and identification of short-lived free radicals through the use of electron paramagnetic resonance (EPR) spectroscopy.
EPM has a large number of uses due to the many ways in which the polymer can be designed, for example; it is used in automotive weather-stripping and seals, self-amalgamating tape, glass run channels, radiators, garden and appliance hoses, tubing, belts, roofing membranes, expansion joints, rubber mechanical goods, plastic impact modification, thermoplastic vulcanisates and motor oil additive ...
Starting in 1946, Ajax gas engines became a primary product utilized by oil and gas companies. In 1958, the first Ajax integral engine / compressor was manufactured and was specifically designed for field gas gathering applications. It was a DPC 230 and was soon followed by a complete line of Ajax integral engine-compressors from 30-360 horsepower.
World War II poster promoting Cooper-Bessemer engines. Cooper-Bessemer was a brand of industrial engines and compressors manufactured in Mount Vernon, Ohio.The Cooper-Bessemer Corporation was formed when the C. & G. Cooper Company (founded in 1833) and the Bessemer Gas Engine Company (founded in 1899) merged in 1929.