Leakage Source Localization Method for Aerospace Composite Structures Based on U-Array Wave Velocity-Compensated Beamforming.

Composite materials have been widely used in spacecraft structures. Due to the harsh environment in space, gas leakage will occur in the structure, so it is necessary to locate the leakage position in time. In this paper, a beamforming localization method based on a U-shaped sensor array is studied. The array can be divided into two subarrays, which can orientate the direction of leakage sources, respectively. To solve the problem of uneven wave velocity caused by the anisotropy of composite materials, this method modifies the relationship between wave velocity and direction and combines it with the dispersion curve to select a filtering frequency band to reduce the influence of dispersion. The experiment simulates vacuum leakage by pumping holes with a diameter of 3 mm with a vacuum pump. The results show that the U-shaped array beamforming algorithm proposed in this paper can obtain a positioning error of 2.21 cm, which provides a new idea for the structural health detection of spacecraft.

Occupational stigma consciousness and professional commitment among Chinese nursing students: Path analysis of survey data.

Pervasive stigma exists around nursing in Chinese society and can affect nursing students' commitment to the profession. Based on the resource conservation theory, this study aimed to investigate the relationship between occupational stigma consciousness and psychological empowerment in nursing students' professional commitment in China. Data were collected from November 2021 to May 2022, and 1189 nursing students participated in the study. Occupational stigma consciousness, professional commitment, and psychological empowerment were assessed using a questionnaire. The path analysis indicated that occupational stigma consciousness negatively predicted professional commitment (ß = -0.127, p < 0.001) and psychological empowerment (ß = -0.329, p < 0.001), and psychological empowerment mediated the relationship between occupational stigma consciousness and professional commitment. To resist occupational stigma consciousness and improve nursing students' professional commitment, nursing policies and education should focus on improving psychological empowerment.