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The ignition characteristics of dual-fuel mixtures consisting of high-reactivity n-dodecane and low-reactivity methane are numerically investigated. The performance of five state-of-the-art n-dodecane chemical mechanisms including comprehensive low hydrocarbon kinetics for single-fuel (SF) and dual-fuel (DF) combustion are studied. The sensitivity of the total fuel to air equivalence ratio (ϕ) and...
BackgroundOpioids are known to relieve pain, and also aggravate pre‐existing hyperalgesia. In animal studies, the N‐methyl‐d‐aspartate‐receptor antagonist nitrous oxide (N2O) was able to prevent hyperalgesia. The present study evaluated the effect of N2O on hyperalgesia after remifentanil infusion in healthy volunteers.
MethodsTwenty‐one healthy volunteers were enrolled in this placebo‐controlled...
Direct injection (DI) natural gas engines are modern engine concepts providing clean combustion and high fuel efficiency. Even at high injection pressures, such engines operate at heterogeneous/stratified fuel/air mixture conditions due to the relatively short mixing time of the fuel jet. The sub-optimal fuel–air mixture results in emissions of unburnt hydrocarbon (UHC). In particular, one of the...
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