Abstract: A system for breaking down a PFA (perfluoroalkyl or polyfluoroalkyl) compound includes a reactor vessel, a heater, and a catalyst. The reactor vessel is operable to hold influent that includes a PFA compound, an alkali, and water, while alkaline hydrolysis separates a fluorine atom from the PFA compound in the influent. The heater is operable to heat the influent to a temperature within the range of 100° Celsius to 700° Celsius. And the catalyst is operable to increase the rate at which alkaline hydrolysis separates a fluorine atom from a PFA compound. The catalyst includes a body that includes a transition metal, which is a d-block metal or a metal from any of the periodic table's groups 4-11. The body also has a shape configured to multiply a surface-area-to-volume ratio by at least 1.5 when the body is disposed in an influent experiencing alkaline hydrolysis.

Abstract: A structural assembly includes a first member and a second member. The first member has at least one fastener receptacle and at least one shear pocket formed in the member side. The Shear pocket has a pocket cross-section. The second member has at least one shear boss protruding outwardly from the second member, the shear boss has a boss cross-section shaped complementary to the pocket cross-section. The shear boss is configured to be received with the shear pocket and transfer only shear load between the first member and the second member. The structural assembly includes a tension fastener configured to engage the fastener receptacle and couple the first member to the second member and transfer only tension load therebetween at least during an initial transfer of the shear load between the first member and the second member by the shear boss.

Abstract: A structural assembly includes a first member and a second member. The first member has at least one fastener receptacle and at least one shear pocket formed in the member side. The Shear pocket has a pocket cross-section. The second member has at least one shear boss protruding outwardly from the second member, the shear boss has a boss cross-section shaped complementary to the pocket cross-section. The shear boss is configured to be received with the shear pocket and transfer only shear load between the first member and the second member. The structural assembly includes a tension fastener configured to engage the fastener receptacle and couple the first member to the second member and transfer only tension load therebetween at least during an initial transfer of the shear load between the first member and the second member by the shear boss.