Understanding Motivations for Dating App Use Among Gay and Bisexual Men: Validation, Latent Profile Analysis, and Differences in Health Outcomes.

While there has been a proliferation in gay dating app (GDA) use in China, research into their potential effects on health outcomes, particularly mental health outcomes, among gay and bisexual men is lacking. The motivations for GDA use are diverse, and understanding users' motivation profiles may provide a necessary starting point for exploring the heterogeneous effects of GDA use on health outcomes. A cross-sectional survey of the motivations for GDA use and other health outcome variables (i.e., condom use frequency, self-stigma, and subjective emptiness) was conducted among 366 Chinese gay and bisexual men. The results of exploration structure equation modeling indicate that the GDA Use Motivation Scale, with a four-factor first-order model, had strong psychometric properties. Then, latent profile analysis (LPA) based on the mean scores of four aspects of motivation was performed. The results of the LPA revealed the existence of four profiles: "Weak motivations" (30.9%), "Differentiated motivations" (17.8%), "Moderate motivations" (30.3%), and "Strong motivations" (21.0%). Differences in health outcomes among the motivation profiles were found by using the Bolck-Croon-Hagenaars approach. Overall, most participants (60.1%) tended to use condoms consistently, regardless of how strong their GDA use motivation was; however, stronger GDA use motivations were associated with higher levels of self-stigma and subjective emptiness. We call for more research to focus on the real needs behind and motivations for GDA use so that all such app users' voices can be heard, as well as to raise awareness about the potential health risks associated with GDA use among Chinese gay and bisexual men.

Mechanical Performances Analysis and Prediction of Short Plant Fiber-Reinforced PLA Composites.

Plant fiber-reinforced polylactic acid (PLA) exhibits excellent mechanical properties and environmental friendliness and, therefore, has a wide range of applications. This study investigated the mechanical properties of three short plant fiber-reinforced PLA composites (flax, jute, and ramie) using mechanical testing and material characterization techniques (SEM, FTIR, and DSC). Additionally, we propose a methodology for predicting the mechanical properties of high-content short plant fiber-reinforced composite materials. Results indicate that flax fibers provide the optimal reinforcement effect due to differences in fiber composition and microstructure. Surface pretreatment of the fibers using alkali and silane coupling agents increases the fiber-matrix interface contact area, improves interface performance, and effectively enhances the mechanical properties of the composite. The mechanical properties of the composites increase with increasing fiber content, reaching the highest value at 40%, which is 38.79% higher than pure PLA. However, further increases in content lead to fiber agglomeration and decreased composite properties. When the content is relatively low (10%), the mechanical properties are degraded because of internal defects in the material, which is 40.42% lower than pure PLA. Through Micro-CT technology, the fiber was reconstructed, and it was found that the fiber was distributed mainly along the direction of injection molding, and the twin-screw process changes the shape and length of the fiber. By introducing the fiber agglomeration factor function and correcting the Halpin-Tsai criterion, the mechanical properties of composite materials with different contents were successfully predicted. Considering the complex stress state of composite materials in actual service processes, a numerical simulation method was established based on transversely isotropic material using the finite element method combined with theoretical analysis. The mechanical properties of high-content short plant fiber-reinforced composite materials were successfully predicted, and the simulation results showed strong agreement with the experimental results.

Managing the value Co-creation of peer service providers in the sharing economy: The perspective of customer incivility.

Previous studies have discussed the preconditions for peer service providers participation in value co-creation from the perspective of the platforms or the peer service providers themselves. However, little attention has been paid to the influence of customers. In the sharing economy, however, customers interact closely with peer service providers, and they have a major influence on the attitudes and behaviours of peer service providers. Based on resource conservation theory, this study uses three waves of tracking surveys and two experiments to investigate the impact of customer unfriendliness on the shared value creation of peer service providers. The results suggest that rude customers in the sharing economy reduce the value creation behaviour of peer service providers by increasing emotional exhaustion. Furthermore, self-efficacy in regulating negative emotions is found to buffer the mechanism by which customer incivility increases the likelihood of emotional exhaustion. Peer service providers with higher self-efficacy in negative emotion regulation have weaker such relationships. This research fills the gap of how customers influence the value creation behaviour of peer service providers in the sharing economy, identifies the potential negative impacts of customer incivility and increases the overall added value of the sharing economy.

Flame-Retardant Cycloaliphatic Epoxy Systems with High Dielectric Performance for Electronic Packaging Materials.

Flame-retardant cycloaliphatic epoxy systems have long been studied; however, the research suffers from slow and unsatisfactory advances. In this work, we synthesized a kind of phosphorus-containing difunctional cycloaliphatic epoxide (called BCEP). Then, triglycidyl isocyanurate (TGIC) was mixed with BCEP to achieve epoxy systems that are rich in phosphorus and nitrogen elements, which were cured with 4-methylhexahydrobenzene anhydride (MeHHPA) to obtain a series of flame-retardant epoxy resins. Curing behaviors, flame retardancy, thermal behaviors, dielectric performance, and the chemical degradation behaviors of the cured epoxy system were investigated. BCEP-TGIC systems showed a high curing activity, and they can be efficiently cured, in which the incorporation of TGIC decreased the curing activity of the resin. As the ratio of BCEP and TGIC was 1:3, the cured resin (BCEP1-TGIC3) showed a relatively good flame retardancy with a limiting oxygen index value of 25.2%. In the cone calorimeter test, they presented a longer time to ignition and a lower heat release than the commercially available cycloaliphatic epoxy resins (ERL-4221). BCEP-TGIC systems presented good thermal stability, as the addition of TGIC delayed the thermal weight loss of the resin. BCEP1-TGIC3 had high dielectric performance and outperformed ERL-4221 over a frequency range of 1 HZ to 1 MHz. BCEP1-TGIC3 could achieve degradation under mild conditions in an alkali methanol/water solution. Benefiting from the advances, BCEP-TGIC systems have potential applications as electronic packaging materials in electrical and electronic fields.

What triggers depressive symptoms among gay and bisexual men? A sequential mediation model of sexual minority-related stigma and self-criticism.

A growing number of studies has shown that gay and bisexual men are more likely to experience adverse mental health status than their heterosexual counterparts. Stigma-related stress and self-criticism are believed likely to exacerbate depressive symptoms among gay and bisexual men. This research used cross-sectional findings to illustrate the mediating role of internalized self-stigma and self-criticism in the association between perceived public stigma and depressive symptoms. A total of 317 Chinese gay and bisexual men (267 gays and 50 bisexuals with a mean age of 25.29) were invited to participate in this study from October to November 2021. Sociodemographic characteristics, perceived public stigma, internalized self-stigma, self-criticism and depressive symptoms were measured through self-reported online questionnaires. The results indicated that the association between perceived public stigma and depressive symptoms was sequentially mediated by internalized self-stigma and self-criticism. The findings indicated that public stigma, as a distal stressor, was perceived and internalized as self-stigma by gay and bisexual men. This self-stigma may pose a risk for depressive symptoms via self-criticism (a maladaptive consequence of their attempts to reduce cognitive dissonance). These results highlight the necessity of reducing sexual minority-related stigma and self-criticism to reduce depressive symptoms. Our findings appeal to society to further decrease prejudice and stigma, increase tolerance, and focus on the negative mental health status of gay and bisexual men.

Influence of Temperature, Humidity and Load Coupling on Mechanical Properties of Adhesive Joints and Establishment of Creep Model.

To study the creep and property degradation behavior of adhesive joints under the coupling action of temperature, humidity and load, polyurethane shear joints were prepared and tested. Different static loads were applied to joints at high temperature (80 °C) and high temperature and humidity (80 °C/95% RH) to test and analyze the creep deformation, and a suitable creep model was established. At the same time, the performance degradation test of the joints under the effect of multifactor coupling was carried out to obtain the variation law of the failure load, and the failure mechanism was discussed based on the failure section. The research shows that the creep strain of the joint at high temperature and humidity was significantly larger than that at high temperature, and the failure fracture time was shorter, in which water molecules played a role of softening and hydrolysis. The viscoelastic multi-integral creep model was used to analyze and predict the creep behavior of the joints. It was found that the creep model could better describe the creep behavior of the joints under uniaxial constant loading. Under the coupling effect of temperature, humidity and load, the failure load decreased with time, and with the increase in static load, the decline range and rate of failure load increased. It was found that the mechanical properties in the high temperature and humidity environment decreased significantly more than those in the high temperature environment. When a static load was applied during creep, cracks easily occurred inside the adhesive layer, and water molecules easily diffused inside the cracks, which increased the decay rate of the mechanical properties. This study provides good theoretical significance and engineering value for the application of polyurethane adhesion structures in rail vehicles.

The Relationship between Intolerance of Uncertainty and Problematic Social Media Use during the COVID-19 Pandemic: A Serial Mediation Model.

The COVID-19 pandemic has brought significant interruptions to life certainty, and there has been a lack of research on the influence of uncertainty. The present research aimed to explore how intolerance of uncertainty, maladaptive coping strategies, and fear of missing out affect social media use in a Chinese community sample (N = 311) during the pandemic. Serial mediation analysis was applied, integrating the mediating role of maladaptive coping strategy and fear of missing out. Intolerance of uncertainty, maladaptive coping strategies, and fear of missing out was positively related to PSMU. Based on the mediation analysis, when age and gender were controlled, the direct effect of intolerance of uncertainty on PSMU was significant. The total indirect effect was also significant. The effect of intolerance of uncertainty on PSMU was mediated by maladaptive coping strategies and fear of missing out. Taken together, maladaptive coping strategies and fear of missing out played a serial mediating role between intolerance of uncertainty and PSMU. The findings imply that strategies to improve the tolerance of uncertainty, reduce fear of missing out, and relevant coping strategies could be potentially helpful in mitigating problematic social media use, especially during the COVID-19 pandemic.

Carbon footprint analysis of straw collection, transportation, and storage system for power generation in China based on emergy evaluation.

Carbon footprint analysis method was employed to evaluate the ecological benefits of the straw collection, transportation, and storage system based on the case of Laifa Straw Recycling Company, and the emergy-based carbon emission indicator system was also set up to assess the relationship between input resource and carbon emission. In the condition of collecting 2 × 108 kg of straw production, the carbon emission of the artificial model (7.26 × 103 t CO2eq) and mechanical model (6.11 × 103 t CO2eq) was greatly lower than that of the straw burned in the field (2.78 × 105 t CO2eq). According to the emergy-based carbon emission indicator system, the carbon emission of straw recycling system was mainly triggered from labor input, which could be reduced by adjusting the resource structure. The ratio of carbon emission to environmental loading rate (ELRCO2) and ratio of carbon emission to emergy sustainability index (ESICO2) of the artificial model were 90.75E+6 kgCO2eq and 1.52E+6 kgCO2eq, respectively, which were higher than that of the mechanical model, 55.55E+6 kgCO2eq and 1.22E+6 kgCO2eq. It was obviously that the mechanical model had weaker influence on environmental loading than that of the artificial model and presented promising sustainable development ability in the case of mitigating carbon emissions.

The Psychometric Properties and Cutoff Score of the Child and Adolescent Mindfulness Measure (CAMM) in Chinese Primary School Students.

To date, the Child and Adolescent Mindfulness Measure (CAMM) has been translated into several languages, including Chinese. This study aimed to explore the reliability and validity of the Chinese version of the CAMM and to identify the appropriate cutoff score among Chinese primary school students. A total of 1283 participants (52.2% males; 11.52 ± 0.78 years of age) completed a series of questionnaires to evaluate their mental health, including mindfulness, subjective well-being, positive youth development (PYD), depression, and anxiety. Item analysis, Confirmatory Factor Analysis (CFA), Exploratory Structural Equation Modeling (ESEM), criterion-related validity analysis, Receiver Operating Characteristic (ROC) analysis, and reliability analysis were performed. The results show that the Chinese version of the CAMM had acceptable item−scale correlation (r = 0.405−0.775, p < 0.001) and was the best fit for the two-factor ESEM model (χ2 = 168.251, p < 0.001, df = 26, TLI = 0.910, CFI = 0.948, RMSEA = 0.065, SRMR = 0.033) among Chinese primary school students. Additionally, the total score of the Chinese version of the CAMM was significantly associated with subjective well-being and PYD (r = 0.287−0.381, p < 0.001), and negatively associated with depression, and anxiety (r = −0.612−−0.542, p < 0.001). Moreover, a cutoff score of 22 or higher revealed a significant predictive power for all the included criteria. Finally, the Chinese version of the CAMM had good internal consistency (Cronbach's α = 0.826, McDonald's ω = 0.826). Altogether, the Chinese version of the CAMM had satisfactory psychometric properties, and it can be applied to Chinese children.

The Paradoxical Effects of the Contagion of Service-Oriented Organizational Citizenship Behavior.

PURPOSE: Previous research on the service-oriented organizational citizenship behavior (OCB) of employees has mainly focused on the examination of its driving factors, and has ignored the consequences that it may bring to the workplace. To bridge this research gap, by shifting the focus to the event observers, a double-edged sword model is constructed in the present study, which helps explain whether, when, and why the service-oriented OCB of coworkers is contagious. METHODOLOGY: Multi-wave data of 239 employees from seven service-oriented companies in the hospitality industry in central and southwestern China were used to support the proposed model. The time-lag method and critical incident techniques were introduced during the data collection stage. OLS regression and the bootstrapping method were employed for hypothesis testing. FINDINGS: Drawing on attribution theory, it is argued that the contagion (vs non-contagion) effects of service-oriented OCB work through the dual cognitive pathways (hypocrisy perception vs serving self-efficacy) of observers, which depend on the self-serving attribution of the observers to the behaviors of their coworkers. Specifically, when the self-serving attribution of observers is high, the service-oriented OCB of their coworkers is positively associated with the hypocrisy perception of the observers, which in turn inhibits their own service-oriented OCB. In contrast, when the self-serving attribution of observers is low, the service-oriented OCB of their coworkers is positively associated with the serving self-efficacy of the observers, which in turn promotes their service-oriented OCB. This framework provides a valuable theoretical explanation perspective and empirical evidence for the exploration of how service-oriented OCB affects observers.

Different Roles of Rumination and Mindfulness among Cyber-Ostracized Adolescents' Psychological Well-Being.

Previous research has confirmed the harmful effects of cyber-ostracism on adolescents. However, research that has investigated the effect of cyber-ostracism on adolescents' psychological well-being and the underlying mechanisms of this influence remains scarce. Using a sample of 421 Chinese adolescents, this study examined the short-term effect of cyber-ostracism on adolescents' psychological well-being, along with the mediating effect of rumination. Mindfulness is considered as a moderator influencing this underlying mechanism. Questionnaires regarding cyber-ostracism, rumination, and mindfulness were administered at the beginning of the spring semester. Psychological well-being was assessed three months later. The study found that cyber-ostracism significantly and negatively predicted adolescents' psychological well-being. As shown by the mediation analysis, rumination partly mediated the effect of cyber-ostracism on adolescents' psychological well-being. Moderated mediation analysis indicated that mindfulness played a moderating role in the relationship between cyber-ostracism and adolescents' psychological well-being as well as the relationship between cyber-ostracism and rumination. Specifically, mindfulness would decrease the negative impact of cyber-ostracism on adolescents' psychological well-being. This study uncovers the short-term effect of cyber-ostracism on adolescents' psychological well-being and accentuates the underlying mechanisms of this effect, which has substantial implications for interventions and practices to reduce the detrimental effects of cyber-ostracism among adolescents.

Can the effectiveness of driver education be sustained? Effects of driving breaks on novice drivers' traffic violations.

Prior studies have shown that driver education can reduce traffic violations. However, few studies have examined how driving break between driver education and owning a car influences novice drivers' traffic violations. The main objective of this study is to examine the association between driving break and traffic violations. Data from 356,786 drivers with a total of 978,855 violations during their first year of driving were extracted from the Wuhan Traffic Management Bureau. Specifically, we focused on three outcome measures: time length of first traffic violation, severity of first traffic violation, and number of traffic violations in the first year of driving. The results indicated that driving break accelerated the occurrence of the first traffic violation but reduced its severity. The results also showed that driving break was significantly related to an increase in traffic violations during the first year of driving. The detrimental effects of driving break on the time length of first traffic violation and the number of traffic violations in the first year of driving were attenuated in older age groups. The inhibitory effect of driving break on serious violations was stronger in older age groups. The findings support that the effectiveness of driver education will fade over time if one does not consolidate the learned knowledge and skills through practice.

Cross-Cultural Adaptation and Validation of the Physical Disability Resiliency Scale in a Sample of Chinese With Physical Disability.

This study adapted the Physical Disability Resilience Scale (PDRS) to Chinese conditions and evaluated the psychometric characteristics of the Chinese version in individuals with physical disability. A total of 438 individuals with physical disability were included in this study. The PDRS was translated to Chinese using a backward translation method. Construct validity, internal consistency reliability, and convergent validity were examined. Confirmatory factor analysis failed to replicate the original five-factor structure of the PDRS. After removing the Spirituality factor and an underperformed item (Item 22), exploratory factor analysis yielded four trait factors (i.e., Emotional and Cognitive Strategies, Physical Activity and Diet, Peer Support, and Support from Family and Friends) and a method-effect factor. A correlated trait-correlated method model that included the four trait factors and a method-effect factor reported better model fit than the four-factor model, which did not consider method effects. The four subscales of the revised PDRS showed adequate internal consistency. The convergent validity of the revised PDRS was established by the moderate-to-strong associations between its four subscales and theoretically related constructs. We conclude that the revised PDRS is a reliable and valid measure in assessing resilience among Chinese people with physical disability.

Evaluating the construct validity of Stress Overload Scale-Short using exploratory structural equation modeling.

This study used exploratory structural equation modeling and confirmatory factor analysis to examine the construct validity of the Chinese version of Stress Overload Scale-Short, which included personal vulnerability and event load. The participants included 629 community residents and 495 university students. The results indicated a better goodness-of-fit using exploratory structural equation modeling compared with confirmatory factor analysis. The Stress Overload Scale-Short performed well in distinguishing individuals with more negative emotion symptoms from the general population. A moderation analysis demonstrated that social support moderates the effect of personal vulnerability on negative emotion symptoms. These results facilitated the application of Stress Overload Scale-Short in the current population.

Character Strengths Lead to Satisfactory Educational Outcomes Through Strength Use: A Longitudinal Analysis.

Despite the flourishing of positive education, understanding of whether different character strengths have different predictive effects on academic achievement/well-being and the mechanisms of actions between character strengths are limited. Specifically, this study adopted strength use as a mediator to understand how character strength (assessed by caring, inquisitiveness, and self-control) is associated with students' end-of-year academic achievements and eudaimonic well-being. Survey data from 349 adolescents from three different schools showed that three factors of character strengths have positive correlations with academic achievements and eudaimonic well-being. Regression models indicated that inquisitiveness and self-control predicted academic achievements, while caring, inquisitiveness, and self-control predicted eudaimonic well-being, with the foremost as the strongest predictor. Mediation analyses indicated that (1) strengths use fully mediated the relationship between inquisitiveness, self-control, and academic achievements/eudaimonic well-being, while (2) caring had a direct effect on eudaimonic well-being. These findings provided possible explanations on how character strengths could affect students' academic achievements or eudaimonic well-being and theoretical and empirical evidence for practices that aim to enhance students' academic achievements and positive developments via interventions based on character strengths.

Validation of a Chinese version of the stress overload scale-short and its use as a screening tool for mental health status.

PURPOSE: Although stress emerges when environmental demands exceed personal resources, existing measurement methods for stress focus only on one aspect. The newly-developed Short Stress Overload Scale (SOS-S) assesses the extent of stress by assessing both event load (i.e., environmental demands) and personal vulnerability (i.e., personal resources). The present study was designed to evaluate the psychometric properties of the Chinese version of Stress Overload Scale-Short (SOS-SC), and further examine its roles in screening mental health status. METHODS: A total of 1364 participants were recruited from communities and colleges for scale validation. RESULTS: Reliabilities were good throughout the subsamples (ω > 0.80). Confirmatory factor analysis indicated the acceptable goodness-of-fit for the two-factor correlated model (Sample 1: 560 community residents). Multi-group confirmatory factor analysis confirmed measurement invariance across community residents (Sample 1) and college students (Sample 2 and Sample 3). Criterion validity and convergent validity were established (Sample 2: 554 college students). Latent moderated structural equations demonstrated that the relationship between SOS-SC and depression is moderated by social support (Sample 2), further validating the SOS-SC. In addition, the SOS-SC effectively screened individuals in a population at different levels of mental health status (i.e., "at risk" vs. "at low risk" for depression symptoms and/or wellbeing). CONCLUSION: The SOS-SC exhibits acceptable psychometric properties in the Chinese context. That said, the two aspects of stress can be differentiated by the Chinese context, therefore, the SOS-SC can be used to measure stress and screen mental health status among the Chinese population, and monitor and evaluate health-promoting interventions.