Stratified charge: A charge containing strains or layers progressively becoming leaner from one layer to the other. With such a charge very lean air-fuel mixtures can he used, but the NOx emissions are increased. Related posts: Personnel Management Operative Functions Administrative Role of PM Competency HR Management Role Change Personnel Policies Personnel Procedures Appealed Policies Implied Policies Specific Policies Personnel records Research Pure research Personnel research Attitude or Opinion Survey Turnover Secondary research Applied research Personnel audit Read more articles Previous PostStoichiometric mixture Next PostSupercharging