While there are several alternative sources of middle distillate fuels, each has its own problems and limitations. Storage and thermal stability will become increasingly important as liquids from coal and shale become a part of the commercial stream. Stability testing implies that the severity of processing required will be controlled by the level of stability specified.
Human awareness of several odorants at varying concentrations were monitored within different environments. The effects of distractions, unfamiliarity with the test environment, and previous training were found to be significant. Efforts were directed at determining not only the odorant levels that can be detected, but also the levels that will be detected.
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