The porous alumina film formed on the alumina plate by anodic oxidation was used as support and the electrolytic impregnation was introduced to support Pt on the catalyst for catalytic combustion of volatile organic compounds (VOC).

The existence and uniqueness of nonnegative solution for a class of age-structured SEIR epidemic model;

By using pure analysis method,are proved the monotone stability,existence and uniqeness of a dynamic state nonnegative solution of a repairable syatem with some singleness components.

This paper deals with the existence of nonnegative solutions to boundary value problems 1p(t)(p(t)y′(t))′+a(t)f(t,y(t))=0, lim t→0+ p(t)y′(t)=0=y(1) where p∈C 1 (0,1) with p>0 on (0,1),f≥0,f(t,y) is nonincreasing with respect to t for each fixed y and nondecreasing with respect to y for each fixed t, and a∈C(0,1) may change sign.

By means of a new iteration method,the existence of a backward solution of Boltzmann equation is proved,with initial data close to a local Maxwell in the case of hard potentials with angular cut-off and with infinite mass and energy.