关键词：
Senior;bicycle;violation;theory of planned behaviour;health belief model
摘要：
In China, bicycles are a popular mode of transportation for senior citizens. A disproportionate number of traffic-related fatalities and injuries involve cyclists. The violation of cycling laws is a significant cause of cyclist crashes. Few studies have analyzed the cycling violation behaviour of seniors. Therefore, it is essential to examine the factors that influence older individuals' intention to engage in cycling violation behaviours. In this study, the effects of social-demographic characteristics, the exogenous constructs in the health belief model (HBM), and the theory of planned behaviour (TPB) on senior cyclists' violation intention were investigated using hierarchical regression analysis. Interviews were conducted with older cyclists in urban areas of Wuhan City, all above 60 years of age. The results showed that very little variance in behavioural intention could be explained by social-demographic factors. The TPB has a significantly greater capacity than the HBM to explain variance in behavioural intention. Perceived susceptibility, perceived benefit, cues to action, subjective norm and attitude significantly impacted behavioural intention, whereas perceived severity, perceived barrier and self-efficacy did not.
摘要：
Abstract Protective coating is one of the effective ways to help concrete structures resist environmental erosion. However, most of the existing coating materials are organic compounds, which have the disadvantages of poor durability and high energy consumption. In this study, metakaolin with excellent durability was used as the main raw material, and a flexible and waterproof ethylene‐vinyl acetate emulsion was added to improve the high brittleness characteristics of metakaolin, resulting in a metakaolin‐based geopolymer coating material. Through tests such as water absorption, hardness, gloss, and tensile properties, we investigated the effects of the powder–liquid ratio and the type and amount of admixture on the properties of the coating. The results show that the coating exhibits better performance when the powder‐to‐liquid ratio is 0.6. Based on this, it was found that the optimal dosage of water‐reducing agent, coupling agent, and defoamer was 0.7%, 0.3%, and 0.3%, respectively.
摘要：
The promotion of green and sustainable development is prompting more and more researchers to investigate eco-friendly cementitious composites. Nevertheless, harmful gas emissions from the burning of large amounts of waste rice straw fibers have caused unavoidable environmental pollution. Experiments were carried out to evaluate the properties of alkali-activated rice straw fiber-modified cement composites at different doses, including water retention, mechanical strength, porosity, hydration, and anti-permeability. Freeze-thaw cycle test and sulfate corrosion test were also conducted. Besides, SEM and FT-IR tests were adopted to reveal the properties of the modified specimens. The results showed that the incorporation of alkali-activated rice straw fibers affected the properties of cement composites. Specifically, the properties of the modified cement specimens were significantly improved with the appropriate amount of rice straw fibers admixture, while the reserve effect was observed with excessive amount. These results help to relieve environmental pollution caused by rice straw fibers, and contribute to theoretical studies on the application of straw fibers in cement-based materials.
期刊：
Construction and Building Materials,2023年408:133836 ISSN：0950-0618
通讯作者：
Hou, HB;Lan, JR
作者机构：
[Wang, Yi; Cai, Yungao; Hou, Haobo; Xiang, Yuwei] Wuhan Univ, Sch Resource & Environm Sci, Wuhan, Peoples R China.;[Lan, Jirong] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China.;[Dong, Yiqie] Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan, Peoples R China.
通讯机构：
[Lan, JR ] H;[Hou, HB ] W;Wuhan Univ, Sch Resource & Environm Sci, Wuhan, Peoples R China.;Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China.
关键词：
Bulk solid waste powder;Mechanochemical activation;NCT;Coagulation activity;Heavy metal stabilization
摘要：
Currently, the stock of nickel–cobalt tailings (NCT) exceeds 30 million tons, and effective utilization is crucial for addressing environmental pollution. This study focuses on modifying NCT and bottom ash (BA) using the mechanochemical method to create cementitious materials. The research findings indicate that when the cement clinker content is below 3 %, the maximum compressive strength of the specimens can reach 4.803 MPa. After 28 days of curing, the leaching concentrations of nickel and cobalt in the consolidated sample decreased from 5.824 and 1.281 mg/L to 0.803 and 0.179 mg/L, respectively. These levels meet the standard set by China for mine repair and backfilling. The consolidation process primarily involves the recombination of elements such as Si, Ca, and Mg in the amorphous material, resulting in the encapsulation of most ions within the structure and eliminating the risk of contamination. This technology enables the treatment and transformation of NCT and BA waste into cementitious materials suitable for backfilling local mining pits. It holds great potential for various civil environmental applications in fields such as green construction materials.
摘要：
Surface wave dispersion curves are widely used to constrain earth velocity structures and are important to compute theoretical synthetic seismograms with a mode-summation approach. While the computation of dispersion curves requires searching roots of nonlinear functions, some high-mode may be missed with improper choice of searching steps. The asymptotic distribution of eigenvalues of the elastic wave equation can be used as auxiliary information to design a sophisticated scheme to compute the surface wave dispersion curves. In this study, we show the Weyl’s law, combined with the Liouville transformation, can be exploited to derive asymptotic eigenvalue counting functions of elastic surface waves in a horizontally stratified or radially heterogeneous medium. We also show the derived formulation according to the Weyl’s law, in its simple case, agrees with previous studies. The derived asymptotic eigenvalue counting functions are validated by comparison with numerical results. This study demonstrates the Weyl’s law can be used to derive eigenvalue counting functions of surface waves in elastic media, and it is also possible to be applied to more complex media.
通讯机构：
[Xu, Y ] W;Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan, Peoples R China.
关键词：
anti-bacterial;coatings;membranes
摘要：
This study aims to develop Ultraviolet-cured (UV-cured) antimicrobial coatings by dispersing epoxy resin F51–quaternary ammonium salt (QAS) as antimicrobial agents in UV-cured emulsions. The molecular structures of these F51–QAS coatings were analyzed using infrared spectroscopy. Thermogravimetric analysis was performed to evaluate the thermal stability of the antimicrobial coatings. Contact angle testing was conducted to investigate the hygroscopic wettability of the coatings. Mechanical properties such as pencil hardness, adhesion strength, flexibility and impact resistance were evaluated. Antimicrobial rate experiments were conducted to examine the antimicrobial properties of the coatings. The antimicrobial properties were examined through rate experiments against Escherichia coli and Staphylococcus aureus. The results showed that when the F51–QAS content was at 2.7%, the UV-cured antimicrobial coatings exhibited excellent overall performance with a 100% antimicrobial rate.
