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For the purpose of endowing TiNb alloy with antibacterial function, a two-step strategy was proposed to fabricate Ag-incorporated TiO2 film on TiNb substrate in this study. X-ray diffraction (XRD), Field-emission scanning electron microscopy (FESEM) and X-ray photoelectron microscopy (XPS) were used to characterize the crystal phases, morphologies and chemical compositions of the samples. The results showed that a layer of anatase TiO2 film with two kinds of morphologies was formed by hydrothermal treatment of TiNb alloy in NH4F-H2O2 solution. When the as-obtained TiNb-based TiO2 film was subjected to a further ultraviolet light irradiation in AgNO3 solution, metallic Ag granules with size range from 60 nm to 1.3 μm were uniformly deposited on the surface of TiO2 particles. Escherichia coli (E. coli) was selected as a model to estimate the bacteriostatic effect of the Ag-TiO2 film. The experimental result indicated that Ag-incorporated TiO2 exhibited excellent antibacterial activity against E. coli. It suggests that this two-step method for preparation of Ag-TiO2 composite film may provide an alternative strategy to reduce bacterial infection for Ti-implants in clinical application.

Clarifying the changes in the utilization of water resources and future demand in the industrial development of the Beijing-Tianjin-Hebei region plays an important supporting role in realizing the optimal allocation of water resources for the industrial development of the Beijing-Tianjin-Hebei region. To this end, the researchers carry out research on the current situation evaluation and demand forecast of water resources utilization in the industrial development of Beijing-Tianjin-Hebei. First, the researchers use the industrial structure variation coefficient method to evaluate the industrial structure variation coefficient of the industrial development of Beijing-Tianjin-Hebei in different periods; secondly, the researchers evaluate the changes in the status quo of the industrial and agricultural water resources utilization and water resource utilization efficiency in different periods in the Beijing-Tianjin-Hebei region. On this basis, the researchers the water used for the development of the three industries in the Beijing-Tianjin-Hebei region in different periods is estimated. Then, the researchers use the trend extrapolation method to reasonably predict the industrial structure of the Beijing-Tianjin-Hebei region during the planning period, and determine the total industrial development production value of the Beijing-Tianjin-Hebei region during the planning period. At last, the researchers use the trend extrapolation method to predict the water efficiency of industrial development in the Beijing-Tianjin-Hebei region during the planning period, and finally determine the water demand for industrial development in the Beijing-Tianjin-Hebei region during the planning period.

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