As an important part of a hotel’s internal environment, color design affects not only customers’ hotel stay experiences, but also their check-in experiences. However, how hotel guests’ emotional experiences are affected by interior color design is understudied in China. Drawing on the theory of color psychology, we designed a Virtual Reality (VR) experiment and a questionnaire to explore how hotel guests’ emotional experience can be influenced by the color scheme of hotel interior color design. The results show that hotel rooms decorated in yellow have a pleasurable effect, those decorated in gray a calming effect, and those decorated in blue a relatively neutral effect. Young participants have more negative emotional responses to rooms decorated in dark yellow. The emotional impact of both gray and yellow with higher grayscale values shifts from positive to negative with the improvement of customers’ educational background. Low grayscale color schemes are preferred over high grayscale ones, and indoor environments with synergistic colors are preferred over contrasting colors. It is also found that male subjects tend to have more positive emotional reactions to all color schemes than females. For most subjects, age and education have no effect on their emotional reactions to different color schemes. These findings have important implications for hotel interior environment color design.

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Abandoned mines are typical areas of soil erosion. Landscape transformation of abandoned mines is an important means to balance the dual objectives of regional ecological restoration and industrial heritage protection, but the secondary development and construction process of mining relics require long-term monitoring with objective scientific indicators and effective assessment of their management effectiveness. This paper takes Tongluo Mountain Mining Park in Chongqing as an example and uses a remote sensing ecological index (RSEI) based on Landsat-8 image data to assess the spatial and temporal differences in the dynamic changes in the ecological and environmental quality of tertiary relic reserves with different degrees of development and protection in the park. Results showed that: ① The effect of vegetation cover, which can significantly improve soil and water conservation capacity. ② The RSEI is applicable to the evaluation of the effectiveness of ecological management of mines with a large amount of bare soil areas. ③ The mean value of the RSEI in the region as a whole increased by 0.090, and the mean values of the RSEI in the primary, secondary and tertiary relic reserves increased by 0.121, 0.112 and 0.006, respectively. ④ The increase in the RSEI in the study area is mainly related to the significant decrease in the dryness index (NDBSI) and the increase in the humidity index (WET). The remote sensing ecological index can objectively reflect the difference in the spatial and temporal dynamics of the ecological environment in tertiary relic protection, and this study provides a theoretical reference for the ecological assessment of secondary development-based management under difficult site conditions.

The phase-field method was used to simulate the propagation of concrete cracks and failure caused by corrosion and expansion of steel bars, which provides ideas for accurate simulation of the corrosion failure process of reinforced concrete (RC) and evaluation of structural durability. In this study, the entire process of corrosion and expansion of steel bars, resulting in cracks and finally falling off of the concrete protective layer, was successfully simulated. The simulation results were in good agreement with the actual observations. By setting different thicknesses of the protective layer, it was found that the thickness of the concrete protective layer had no obvious effect on limiting concrete cracks caused by the corrosion of steel bars. However, increasing the thickness of the protective layer can delay the speed of crack propagation. Simultaneously, considering the corrosion and expansion of multiple steel bars, according to the thickness of the protective layer and the spacing between the reinforcing bars, two forms of wedge-shaped cracking and laminar spalling of the protective layer are simulated. The simulation result is consistent with the actual observation phenomenon. This fully illustrates the possibility of using the phase-field method to simulate the corrosion fracture of RC and provides a reference for the engineering design and durability research of concrete structures.

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