Time filter

Source Type

Chongqing, China

Li M.,Wuhan University of Technology | Liu X.,Wuhan University of Technology | Zou B.,Wuhan University of Technology | Li X.-H.,Gezhouba Explosive Co.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2013

The reasonable position of anti-slide piles generally adopt the trial method for reinforcement of the slope, which is always conservative with big safe reservation. Using anti-slide pile location as research object, numerical simulation methods such as FLAC3D and ANSYS were used to simulate the anti-slide pile structure features of 5 different pile locations. The anti-slide pile the internal forces of each pile location in the case of the same factor of safety. On the basis of the anti-slide pile structure design requirement and the internal force diagram of each pile location, analyze the effect of pile location change to its structure. Comparing with the analysis results of 5 pile locations, the reasonable reinforce location can be obtained from the perspective of the project cost and verified by traditional design methods, providing reference to the global optimization of anti-slide pile structure.

Jia Z.,Gezhouba Explosive Co. | Dong Y.,Gezhouba Explosive Co. | Zhao H.,Gezhouba Explosive Co. | Zhou G.,Gezhouba Explosive Co. | Fu X.,Southwest University
Research on Chemical Intermediates | Year: 2015

Abstract A novel layered crystalline of organic-inorganic hybrid material aluminium 3-bromopropylphosphonate-phosphate (AlPS-BrPPAS) was synthesized and used as catalyst supports for immobilization of chiral salen Mn(III) with different types of diamine linkers. The heterogeneous salen Mn(III) catalysts were characterized by FT-IR, XRD, TG, SEM, and N2 sorption, and the results indicated the successful immobilization of the chiral Mn(III) salen complex. It was found that the structure of the catalysts was closely correlated with the linkers. The confinement effect of linkers on the catalytic performance of the heterogeneous catalysts was studied for the asymmetric epoxidation of unfunctionalized olefins with sodium hypochlorite as an oxidant. Moreover, the heterogeneous chiral salen Mn(III) catalysts can be recovered and reused up to nine times with retention of conversion and enantioselectivity. Interestingly, two heterogeneous chiral salen Mn(III) catalysts with different linkers also significantly alter the configuration of epoxide products for 6-cyano-2,2-dimethylchromene and 6-nitro-2,2-dimethyl-chromene. © 2014 Springer Science+Business Media Dordrecht.

Discover hidden collaborations