TY - JOUR TI - A spatial structural derivative model for ultraslow diffusion AU - Xu Wei AU - Chen Wen AU - Liang Ying-Jie AU - Weberszpil Jose JN - Thermal Science PY - 2017 VL - 21 IS - 11 SP - 121 EP - 127 PT - Article AB - This study investigates the ultraslow diffusion by a spatial structural derivative, in which the exponential function ex is selected as the structural function to construct the local structural derivative diffusion equation model. The analytical solution of the diffusion equation is a form of Biexponential distribution. Its corresponding mean squared displacement is numerically calculated, and increases more slowly than the logarithmic function of time. The local structural derivative diffusion equation with the structural function ex in space is an alternative physical and mathematical modeling model to characterize a kind of ultraslow diffusion.