We perform a perturbative QCD analysis of the gluonic gravitational form factors (GFFs) proton and pion at large momentum transfer. derive explicit factorization formula GFFs in terms distribution amplitudes hadrons. At leading power, we find that gluon Ag Cg scale as Ag?(t)=Cg?(t)?1/(?t) for pion, Agp(t)?1/(?t)2 Cgp(t)?ln2?(?t/?2)/(?t)3 proton, respectively, where t is transfer ? non-perturbat...

The present study attempts to improve heat transfer efficiency of a domestic gas burner by enhancing heat transfer from flue gases. Heat transfer can be augmented using the obstacles that are inserted into the flow field near the heated wall of the domestic gas burner. First, to achive the maximum efficiency, the insert geometry is optimized by the multi-objective genetic algorithm so that heat...