A green and efficient nanoinhibitor VC-PA-MEL for aluminum dust explosion was synthesized in this study. The inhibition effect of the novel inhibitor on aluminum dust explosions was systematically studied. Results showed that after adding VC-PA-MEL, the dust flames transited from the luminous flame with a continuous structure to irregular discrete flames. The flame propagation velocities of 30 and 5 μm dust declined to 96.54 and 99.38%, respectively. The minimum inhibition concentrations for 30 and 5 μm aluminum dust were 600 and 800 g/m3, respectively. Explosion residuals were analyzed to reveal the inhibition mechanism of VC-PA-MEL in detail. VC-PA-MEL can effectively inhibit the explosion of aluminum dust through the synergistic physics and chemistry effects. In general, the combustion heat could be absorbed and the free radicals could be scavenged. VC-PA-MEL provides a potential direction for developing efficient inhibitors for the inhibition of aluminum dust explosions and to improve process safety.

Nowadays embedded parts which connect steel members with concrete structures have frequently emerged in civil engineering; however the existing design code for embedded parts cannot satisfy the increasing demand of engineering as it was derived from limited experiments. In the paper, a finite element study on embedded parts with big-diameter reinforcing bars under shear force is conducted. The aim of the study was to fully investigate the mechanical performances of embedded parts under shear force using a three-dimensional finite element analysis with the help of a commercial software ANSYS. Cross-section internal force of anchor bar, embedded part deformation, interaction force between anchor bar and concrete, and friction force were investigated in order to well know the system response. The results show that the shear capacity of embedded part obtained from finite element analysis is conservative.