Mechanocatalytic Synthesis of Ammonia by Titanium Dioxide with Bridge-Oxygen Vacancies: Investigating Mechanism from the Experimental and First-Principle Approach.

Mechanochemical ammonia (NH) synthesis is an emerging mild approach derived from nitrogen (N) gas and hydrogen (H) source. The gas-liquid phase mechanochemical process utilizes water (HO), rather than conventional hydrogen (H) gas, as H sources, thus avoiding carbon dioxide (CO) emission during H production. However, ammonia yield is relatively low to meet practical demand due to huge energy barriers of N activation and HO dissociation.

Study on stress and deformation characteristics of existing-new two-stage cantilever retaining wall.

A two-stage cantilever retaining wall is composed of two single-stage cantilever retaining walls, which are stacked up and down. The structure not only has the advantages of a single-stage retaining wall, but also compensates for the shortcomings of the height limit of the single-stage retaining wall; therefore, it has been gradually applied in projects. Based on the actual project of Zhongwei-Lanzhou Passenger Dedicated Line into Lanzhou Hub, this paper studies the influence of the construction of new cantilever retaining wall and the filling of subgrade on the deformation and earth pressure of the new cantilever wall and the existing cantilever wall by means of field test and numerical simulation.