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Based on the Flügge theory and orthotropic theory, the acoustic vibration coupling model of ring-stiffened cylindrical shell is established by using the wave propagation method and virtual source method. And the effects of water immersion on both sides, free surface, and hydrostatic pressure on the cylindrical shell are considered in the coupling model. Muller three-point iterative method is used to solve the coupling frequency. The calculation results of degradation theory are compared with COMSOL’s calculation results and experimental results, respectively, which verifies the reliability of the theoretical method. Finally, the influence of fluid load, ring rib parameters, boundary conditions, hydrostatic pressure, and free surface on the coupled vibration of ring-stiffened cylindrical shell is analyzed by an example.

Fe 2+ complexation wet denitrification technology has become a research hotspot. It is very important to achieve efficient regeneration of the absorbent and increase NO absorption in the Fe 2+ complexation system. They are the key to the industrial application of the Fe 2+ complexation absorption process. In this paper, 2-phosphonate-butane-1,2,4-tricarboxylic acid and ethylenediamine tetraacetic acid were used as ligands to prepare a composite system for the first time. The characteristics of NO removal were investigated under different temperatures, pHs, Fe 2+ concentrations, O 2 contents, NO concentrations, CO 2 contents, and SO 2 concentrations. Compared with the single ligand, the results show that the denitrification performance of the solution with a complex ligand is significantly improved. In this system, pH 9, 40 °C temperature, and 20 mmol/L Fe 2+ concentration are the economic ideal conditions for NO removal. The system can realize simultaneous removal of NO and SO 2 , but SO 2 in flue gas has a dual effect on the NO removal reaction.

Brain drain has become a key issue in a family business' survival and development. This study aimed to explore the factors influencing employee satisfaction in family enterprises and to provide suggestions for their management. Based on the Two-factor Theory, the study used 200 employees of the Qingdao Hengxing group as the research group. A questionnaire was used to survey and collect the employees' views on the identity and behavior of the group's family business. The results of this study show that family businesses should be open to employees, clearly introduce their family business nature to employees, and improve employees' identification with the company. On the other hand, as a family enterprise, the company should ensure that employees are treated equally and avoid the phenomenon of "cronyism" and "nepotism" in the company's selection process and employment.