lean gas
3.Think of it this way: the gut community in obese mice is like a fuel-efficient car, extracting more energy from food and passing more along to its host than its gas-guzzler counterpart in lean mice.
4.The paper introduces development and research of foreign gas engines and describes briefly lean-burn combustion, EGR, structure of pre-combustion as well as application of turbocharger and miller cycle and analyzes the effect of the technologies on emission and efficiency of engines.
6.The effect of rare-earths (La, Ce) permeated in gas-plase on the intercrystallinecorrosiveness of steel 1Cr18Ni9 was investigated by the corrosion test such as sulfuric acid andsulfuric acidferric sulfate, scanning electron microscope(SEM) and electronic probe(EPMA). Theresults shown that, little lean chrome region exists in the surface of steel 1Cr18Ni9 treated byrarecarths, and its intercrystalline corrosiveness improves greatly, which exceeds that of stabilized1Cr18Ni9 steel.
