Landscape Space Creation of Red Star·Xintiandi Exhibition Area in Liuzhou

The landscape design of the Red Star·Xintiandi Exhibition Area in Liuzhou is studied. The landscape design of the main space includes entrance( declaration),vestibule( etiquette),entrance hall( distinguished),reception area( communication) and courtyard( artistic conception). The space design of plant landscape includes diversified plant configurations( multiple angels,multiple choices,and multiple levels) and artistic conception of plant space( colors,light and shadow,aroma and culture).

Dynamic response of precast segmental bridge columns under heavy truck impact

Considering the wide application of precast segmental bridge columns(PSBCs)in engineering practice,impact-resistant performance has gained significant attention.However,few studies have focused on PSBCs subjected to high-energy impacts caused by heavy truck collisions.Therefore,the behavior of PSBCs under a heavy truck impact was investigated in this study using high-fidelity finite element(FE)models.The detailed FE modeling methods of the PSBCs and heavy trucks were validated against experimental tests.The validated modeling methods were employed to simulate collisions between PSBCs and heavy trucks.The simulation results demonstrated that the engine and cargo caused two major peak impact forces during collision.Subsequently,the impact force,failure mode,displacement,and internal force of the PSBCs under heavy truck impacts were scrutinized.An extensive study was performed to assess the influence of the section size,truck weight,impact velocity,and number of precast segments on the impact responses.The truck weight was found to have a minor effect on the engine impact force.Damage was found to be localized at the bottom of the three segments,with the top remaining primarily undamaged.This parametric study demonstrated that larger cross-sections may be a preferred option to protect PSBCs against the impact of heavy trucks.

Rh-Catalyzed oxidation and trifluoroethoxylationof N-aryl-pyrrolidin-2-ones: a domino approachfor the synthesis of N-aryl-5-(2,2,2-trifluoroethoxy)-1,5-dihydro-2H-pyrrol-2-ones

The synthesis of trifluoroethoxylated dihydropyrrolidones via rhodium-catalyzed oxidation and trifluoroethoxylation of pyrrolidones is presented in this paper. This process realized the trifluoroethoxylation ofnon-activated sp^(3) C–H by a domino approach for the first time, without requiring the preparation of substrates with halogens or guiding groups. The formed α,β-unsaturated-γ-butyrolactams can be furtherfunctionalized via the Michael addition reaction or realize the exchange of the trifluoroethoxy group tothe hexafluoroisopropoxy group. Such compounds exhibit anti-tumor activity in vitro and can be used ashit compounds for further research. This method provides an efficient domino approach for generatingvarious trifluoroethoxylated dihydropyrrolidones.