At present, with the rapid development of the computer Internet, digital media art based on digital technology, to create a high aesthetic works of art and information products. Digital media has gradually evolved into the latest technology in the world, covering a wide range of fields, including education. Its reasonable application in teaching design can significantly improve teaching efficiency and quality. Based on the above background, the purpose of this paper is based on the digital media environment art design professional knowledge communication teaching design and practice. Therefore, this study will be based on the connotation and core of digital media environmental art knowledge construction theory, based on the actual teaching situation in China, to construct a universal teaching mode. This study comprehensively uses the methods of literature research, action research and investigation. First of all, the connotation of digital media characteristics, basic principles, process law and other content of in-depth exploration. Secondly, based on the content of theoretical exploration, combined with the actual teaching situation in China, the design principles and design ideas of the teaching mode are determined, and the "IG-GC two-level six stage knowledge construction teaching mode" is constructed. Finally, the teaching model is applied to real teaching cases, and it is found that the new teaching mode can improve students' scores by 20%. The rationality and effectiveness of the teaching mode are preliminarily verified through standardized tests and questionnaire interviews.

Based on thermo-optical phase transition effect, VO2/ZnO nanostructure composite films are designed and successfully prepared by depositing ZnO films with high (002) orientation on soda-lime glass substrates first, and then the vanadium dioxide films are fabricated by depositing vanadium metal films on ZnO films at room temperature and thermal oxidation treatment. The thermochromic properties of VO2/ZnO nanocomposite films are measured and compared with the single-layer VO2 films on SiO2 glass substrates with the same thickness. The lattice distortion and bonding state of the VO2/ZnO nanocomposite films before and after phase transition are observed and analyzed by Raman spectroscopy at the different temperatures. The relations of infrared switching properties and phase transition temperature to nanostructure and film thickness are discussed. The results show that the thermochromic optical properties are improved significantly. VO2/ZnO nano-composite films have high (002) orientation so that the infrared transmittance before phase transition is more than twice as large as that after phase transition, and the width of thermal hysteresis is narrowed by about 5℃ and phase transition temperature is decreased about 8℃. It suggestes that the nano-composite films can significantly reduce the phase transition temperature and enhance the infrared light switch modulation capabilities of VO2 thin films.

Digital storytelling refers to a short form of digital media production, in which images, music, narrative and voice are woven together to give deep dimension and vivid color to characters, situations, experiences, and insights. The application of digital storytelling in foreign language teaching can help the instructor present teaching materials and convey specific contextual emotions; on the other hand, the students are offered the opportunities to intake "the comprehensible input", cultivate the literacy development of a target language and improve their language skills. The design of digital storytelling follows the principles in language teaching methodology, cognitive psychology and multimedia interface aesthetics.

The Tianjin area is covered by soft, water-bearing silt and silty sand strata and has a high groundwater table. The excavation of a cross passage in this area entails a high risk of water and sand inflows and a significant impact on the structural integrity of the mainline tunnels—particularly during the excavation of the break-out and break-in openings. However, few cross passages have been excavated in water-bearing soft soil strata using the tunnel boring machine (TBM) method, and the necessary safety control techniques and environmental impact of TBM tunnelling of cross passages in such soil strata remain unclear, which limits the application of this tunnelling method. In this study, a cross passage excavated using the TBM method—the first of its kind in the Tianjin area—was investigated. We identified the key risk control measures for the construction process, particularly the excavation of the break-out and break-in openings, and analysed the TBM operating parameters, monitoring ground and building settlements, and monitored mainline tunnel deformations and mechanical responses at key points of the construction process, revealing the ground and tunnel structure deformation patterns during the cross passage excavation. Our major conclusions are as follows. 1) The ground surrounding the cross passage break-out opening was stabilised by performing two rounds of grouting and small-range freezing, and the break-in opening was excavated using a completely enclosed steel sleeve. These measures effectively prevented the risk of water and sand inflows during the excavation of the break-out and break-in openings in the silt and silty sand strata. 2) The thrust of the TBM was approximately 2000 kN during the break-out phase, and it increased to 3500 kN after the break-out opening was excavated. The torsional moment of the cutter disc was large during the break-out phase. Break-out mainline tunnel displacement monitoring data indicated that the thrust had a significant effect on the mainline tunnel during the break-out phase. 3) The TBM tunnelling of the cross passage caused ground loss, and the ground settlement increased as the excavation proceeded. The ground settlement exhibited a U-shaped distribution along the cross passage axis, with the maximum settlement being 10 mm. During the break-out phase, the deformation of the break-out mainline tunnel exhibited a duck-egg-shaped distribution. The clearance convergence of the break-out mainline tunnel was within ± 4, and the displacement and clearance convergence of the break-in mainline tunnel were controlled within ± 1 mm.

No abstract