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To improve the heat storage capacity of a salt gradient solar pond(SGSP), a full understanding on the thermal and solutal transfer characteristics is needed. Lattice Boltzmann method was adopted to numerically simulate the double diffusive convection and entropy generation inside an internal heating enclosure attaching with a porous layer. The influence of internal heat generation, Darcy number, Soret and Dufour effect on heat and mass transfer rates and entropy generation was deeply discussed. Results show that attaching a porous layer at the bottom is beneficial to inhibit the heat and mass transfer rates, and blindly reducing Darcy number has no significant influence. Increasing internal heat generation can also suppress the heat and mass transfer rates. Soret effect can improve the solutal transfer process, while Dufour effect has positive influence on thermal transfer process. Furthermore, porous layer for lower Darcy number can inhibit the entropy generation. Internal heat generation can enhance the entropy generation, and thermal irreversibility has dominant effect for large internal heat generation. Soret effect has no mild influence on entropy generation, while Dufour effect promotes the entropy generation. Under the stronger Dufour effect, thermal irreversibility dominates the total entropy generation. [ABSTRACT FROM AUTHOR]

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In order to study the different stages of aging asphalt fatigue performance, scanning linear amplitude（LAS） and dielectric constant were tested on the heat and oxygen aging, ultraviolet light, and water coupling before and after the 90 # matrix asphalt, SBS modified asphalt, from two angles of damage accumulation and phase angle change discussed the change of the different stages of aging asphalt fatigue performance. The relationship between the slope absolute value B of asphalt component and fatigue strain curve based on dielectric properties, fatigue failure strain εd and fatigue life Nf based on damage and fatigue failure strain εθ and fatigue life N′f based on phase angle were analyzed. The results show that the longer the aging degree, the shorter the fatigue life of asphalt, and the greater the strain sensitivity of asphalt based on fatigue resistance. The results show that the longer the aging degree, the shorter the fatigue life of asphalt, and the greater the strain sensitivity of asphalt based on fatigue resistance. It is reasonable and feasible to use the failure strain εD and fatigue life Nf defined by the damage-based fatigue failure criterion to evaluate the anti-fatigue performance of asphalt, and it is consistent with the analysis results of the failure strain ε? and fatigue life N′f defined by the phase angle fatigue failure criterion. It can be seen that the method to divide asphalt components based on dielectric properties is reasonable and feasible, and can be correlated with asphalt pavement performance to further guide the asphalt modification process. [ABSTRACT FROM AUTHOR]