Yuling Zhang

Rapid economic development in the past four decades in China has brought about significant consequences for people’s livelihoods. Healthy social mobility is fundamental for equality of opportunity, economic vitality, and socioeconomic sustainability. This paper examines the intragenerational livelihood mobility of urban residents in recent decades based on a case study in Guangzhou City and Foshan City, Guangdong Province, Southeast China. Longitudinal livelihood trajectory surveys have been investigated to gain research data. The primary determinants of livelihood mobility were also elucidated through analysis of muti-logistic regression. The results show that five livelihood trajectories are summarized based on their vertical movements in social status. The results further indicate that class polarization exists in urban residents’ mobility. 48.2% of respondents have experienced upward mobility, and 33.6% of them have even stepped over social classes. Meanwhile, the livelihoods of the others remained unchanged or suffered downward mobility. Respondents with male gender, better educational attainments, positive personality, and lower hierarchies of first occupations are associated with a higher probability of upward mobility. These results suggest that wealth redistribution among different social groups should be implemented to promote the benefits of economic growth being shared more broadly, and ultimately to boost socioeconomic sustainability.

Drawing on self-expansion theory, this study develops and tests an integrated model that incorporates impression in memory, place identity, destination psychological ownership, self-actualisation, and self-concept clarity to explain how diasporas achieve self-concept clarity through tourism. A cross-sectional survey was conducted among diasporic Chinese visiting their ancestral hometowns. Findings indicate that the impression in memory positively influences both place identity and destination psychological ownership. Furthermore, self-actualisation serves as a serial mediator linking place identity and destination psychological ownership to self-concept clarity. These results offer practical implications for destinations and policymakers seeking to attract diasporas, and for diasporas aiming to enhance self-concept clarity.

The influence of temperature on the physicochemical properties of air nanobubbles (A-NBs) in a complex salt solution is crucial for their application in corrosion inhibition within circulating cooling systems. The variation patterns of the physicochemical properties, the corrosion inhibition of A-NBs on stainless steel and their underlying mechanisms in the temperature range of the circulating cooling system were investigated. Results indicated that increasing temperature led to a decrease in the number concentration of A-NBs, their average particle size, and the absolute value of the zeta potential gradually. Weight loss measurements, electrochemical analyses, and morphological characterizations of corrosion specimens demonstrated that A-NBs exhibited effective corrosion inhibition, particularly at concentrations on the order of 10⁷ particles/mL and temperature ≤50 °C. Electrical conductivity, impedance, and surface characterizations of the corrosion specimens revealed that elevated temperatures were detrimental to the stability of A-NBs and the bubble layer. The binding effect of A-NBs on corrosive ions, as well as the protective roles of the passive film, calcium carbonate scale, and bubble layer on the stainless steel surface, were weakened, leading to an accelerated corrosion rate. This study provides insights into the industrial application of A-NBs as an environmentally friendly corrosion inhibition technology.

The corrosion inhibition performance of air nanobubbles (A‐NBs) is expected to address the environmental problems arising from chemical corrosion. In order to regulate the corrosion inhibition performance of A‐NBs, the particle characteristics of A‐NBs in flowing composite salt solutions are investigated, and the corrosion inhibition effect of A‐NBs under different concentration ratios and rotational speed of simulated circulating cooling water is studied. High salt concentrations significantly reduced the particle size, concentration, and zeta‐potential value of A‐NBs, thus reducing the stability of A‐NBs. The flow velocity has a slight effect on A‐NBs. The results of the weight loss and electrochemical method showed that A‐NBs achieved the highest corrosion inhibition rate of 55% under a concentration ratio of 1.5 and a rotational speed of 100 r min⁻¹. The surface characterization of brass specimens revealed that A‐NBs facilitated the formation of Cu₂(OH)₂CO₃ passivation film, calcium carbonate scale film, and a layer of bubbles on the surface of brass, which subsequently mitigated the erosive impact of the fluid. A‐NBs can adsorb cations and thus reduce the concentration of corrosive ions. However, the increase in concentration ratio and rotational speed impeded the formation of the bubble layer and passivation film.