Karla S Klas, Peter G Vlahos, Michael J McCully, David R Piche, Stewart C Wang
School-based prevention program associated with increased short- and long-term retention of safety knowledge
Journal of burn care & research : official publication of the American Burn Association
transition pathways energy landscape atactic polystyrene aps glassy specimens probed glasstransition temperature transitions considered elementary structural relaxation event whose corresponding rate constant calculated applying multidimensional transitionstate theory initially wide spectrum firstorder saddle points surrounding local minima energy landscape discovered stabilized hybrid eigenmodefollowing method minimalenergy reaction paths adjacent minima constructed quadratic descent method heights free energy potential energy entropy barriers estimated every connected triplet transition state minima resulting distribution free energy barriers asymmetric extremely broad extending high barrier heights 50 kbt corresponding distribution rate constants extends 30 orders magnitude welldefined peaks time scales corresponding subglass relaxations polystyrene analysis curvature along reaction paths reveals multitude different rearrangement mechanisms bearing multiple distinct phases finally connections theoretical models glass phenomenology allows prediction based firstprinciples ideal glasstransition temperature entering vogelfulchertammann vft equation describing superarrhenius temperature dependence glassy dynamics predictions time scales subglass relaxations vft temperature favorable agreement available experimental literature data systems similar molecular weight conditions