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The purpose of this paper is to derive a new lubrication model of double involute gears drive and study the effect of the tooth waist order parameters of double involute gears on lubrication performance.

The new lubrication model of double involute gears drive was established according to the meshing characteristics of double involute gears drive and the finite length line contact elastohydrodynamic lubrication theory. Numerical calculation of the lubrication model of gear drive was conducted using the multigrid method.

The results show that the oil film necking phenomenon and the oil film pressure peak emerged at the tooth waist order area and the tooth profile ends, and when compared with involute gear, the lubrication performance at the tooth waist order area is better than that at the tooth profile ends. The effect of tooth waist order parameters on lubrication performance at the tooth waist order area was greater than that at other areas.

This research will promote the application of the double involute gear as soon as possible, and it has the reference value for other types of gears.

The purpose of this paper is to study the lubrication characteristics of double involute gear (DIG), compare its lubrication differences under quasi-static and tribo-dynamic conditions and study the influence of different factors on its lubrication characteristics under the tribo-dynamic condition.

According to the meshing characteristics of DIG and elastohydrodynamic lubrication (EHL) theory, a tribo-dynamic model of DIG is established based on the “subsection method.” The Runge-Kutta method and the multigrid method are integrated to solve the model, and the dynamic analytical model of lubricating oil is established in the iterative solution.

The load and the transmission error fluctuate obviously under the tribo-dynamic condition, which is not conducive to the lubrication of DIG. The influence of rotational speeds and torque on the lubrication properties of DIG has obvious differences under tribo-dynamic and quasi-static conditions.

This research can provide a theoretical basis for improving the lubrication performance, reducing the loss of mechanical efficiency and improving the bearing capacity and service life of DIG.

This study aims to investigate the role of multidimensional social capital and consumer subjective well-being in online brand communities (OBCs). The aim was to provide practical guidance to global brand marketers for cultivating and strengthening OBC operations, optimizing consumer-brand-community relationships and creating value in the digital age.

A total of 576 valid questionnaires were collected through an online survey, and the model was tested using partial least squares structural equation modeling.

In OBCs, the cognitive dimension of social capital (i.e. shared language and shared vision) strongly affects the relational dimension of social capital (i.e. social trust and reciprocity). Both these dimensions also positively influence consumer community subjective well-being, which, in turn, enhances consumer brand subjective well-being. Thus, community subjective well-being has a mediating role in the aforementioned relationship, and brand community is an antecedent to brand subjective well-being.

Future studies should investigate other dimensions of social capital and well-being, as well as moderator variables, social environments and types of culture.

This study constructed a conceptual framework that focused on the effect of multidimensional social capital in OBCs to elucidate antecedents of brand subjective well-being from the perspectives of social networks and relationships. Moreover, it examined how brands strategically expand their clientele base with regard to target customers.

The converging global trends for countries and educational institutions is to push the boundaries of science and develop new technologies through the application of internationalization strategies. However, the extent to which higher education institutions (HEIs) participate and apply internationalization strategies in higher education (IOHE) varies by institution and region.

The study employed the multi-level ordinal regression to estimate how various factors influence the rationales to internationalize higher education.

The study revealed that the salience of HEIs choice of a specific rationale for the IOHE stems from either the academic, administrative and socio-cultural levels.

This article posits, particularly for Kenyan universities, that proper identification of their needs and wants for their higher education is key to successfully engage in IOHE. This recognition of needs and wants places them in the right position to identify appropriate rationales to engage in this complex process.

The novelty of this study is based on the fact that in Sub-Saharan Africa, research on the rationales for the IOHE in universities is highly lacking. A focus on more localized contexts is a critical starting point for these institutions to own and situate the internationalization process in a way that meets their needs.

Consumers share negative brand experience in many occasions to vent their emotion and seek support. The purpose of this paper is to investigate the impact of negative sharing on members’ happiness in online brand communities by drawing from two opposing constructs: social support and social exclusion.

Both survey and experiment methods were employed to test the conceptual model. Online survey data were collected from 1,015 mobile internet users.

The findings reveal that negative sharing may enhance a sharer’s happiness through online social support particularly for novice community members. The findings also indicate greater online social exclusion for experienced members than for novice members. These findings cast doubt on the widely held assumption that increased engagement in a community will always produces positive outcomes. The moderating effect of membership duration is confirmed with an experiment of MI’s brand community members.

The study of happiness in online brand community sheds new light on consumer–brand and user–community relationships.

While most previous studies on negative sharing only explored the negative side of consequences, the authors contribute to this line of research by introducing both positive (social support) and negative (social exclusion) outcomes of negative reviews. The model also explains the conditions under which negative reviews enhance social support and social exclusion.

With the rapid development of social media in the past few years, some dark aspects of usage have appeared, e.g., Weibo addiction. Therefore, the purpose of this paper is to address the question of how Weibo keeps users hooked.

The study utilizes the netnography method to explore the symptoms of Weibo addiction and how it is formed.

First, some Weibo users have typical symptoms of addictive behavior, such as withdrawal, loss of control and general living problems; second, narcissism plays an important role in the process of Weibo addiction and has a stronger effect on content generation than content consumption; third, some users use Weibo as a means to alleviate anxiety, but they can then become more anxious owing to addiction; and fourth, the effect of comments has two sides – on the one hand, comments are one kind of feedback to posts, satisfying posters’ social needs, while on the other hand, a storytelling system consists of one post and its comments, upon which some Weibo users become more dependent.

This research is only a preliminary, exploratory study. Therefore, care should be taken when interpreting these findings.

This study should help social media service providers and users to pay attention to the risk of social media addiction. Social media service providers should take social responsibility, design more user-oriented guidelines for marketing ethics and launch more responsible marketing activities. Users should enhance self-control and better balance social media use and offline real life.

Netnography has not been widely used as an addictive behavior research technique. This study is further bolstered because it has also noticed the difference of addiction mechanisms between addictive micro-bloggers and their followers.

Drawing from social contagion theory, this study aims to clarify whether consumers become motivated to help a brand and its community when observing other members contributing to society. The authors also analyzed the boundary conditions and mechanisms of this process.

A mixed-method approach was used to test hypotheses. Study 1 collected survey data from Chinese automobile brand communities, which were analyzed by using partial least squares structural equation modeling. Study 2 conducted an experiment with a fictional Chinese smartphone brand community.

Results showed that brand community social responsibility influenced brand community citizenship behavior but did not directly influence brand citizenship behavior. Collective self-esteem respectively mediated the relationships between brand community social responsibility and both brand community citizenship behavior and brand citizenship behavior. Additionally, a sequential mediation mechanism was identified, where collective self-esteem and brand community citizenship behavior functioned as the first and second mediators. Furthermore, membership duration positively moderated the relationship between brand community social responsibility and collective self-esteem and moderated the mediation effects.

Brand community managers should conduct various social responsibility activities to elicit community and brand citizenship behaviors by cultivating ethical awareness. These activities should be tailored to the membership duration.

To the best of the authors’ knowledge, this study is the first to explore how brand community social responsibility cultivates community and brand citizenship behavior. It is also based on social contagion theory to demonstrate the sequential mediation mechanism.

In order to develop high shape retention yarn and investigate the effects of spinning process and core yarn contents on the shape retention of yarn, in this paper, three kinds of yarns, JC/T400 18.5tex (55.6dtex) core-spun yarn, JC/T400 18.5tex (44.4dtex) core-spun yarn and JC18.5tex pure cotton yarn were spun by using the complete condensing Siro-spinning technology. The paper aims to discuss these issues.

In this paper, the core-spun yarns were spun by using the complete condensing spinning and Siro-spinning technology. Two key spinning processes, yarn twist factor and core yarn pre-draft ratio, were optimized by using the orthogonal test method first. Then, via the variable control method, the position of the core yarn, the position of the bell mouth and the center distance between two bell mouths were optimized, respectively, and corresponding optimal spinning process of the three yarns was determined. Finally, the yarns were spun under the optimal process, and the performance of the spun yarns was tested and compared.

Results show that the yarn twist factor affects yarn strength and hairiness, the position of bell mouth affects the evenness and hairiness of the yarn mainly, and the position of the core yarn affects the coverage and hairiness of the yarn. For the Z-twist spinning, the core yarn enters the front roller from the left side of two strands center, which is beneficial to improve the covering effect of core yarn, and reduce the pilling phenomenon of the yarn. The contents of core yarn affect indicators of the yarn shape retention, such as yarn strength, elastic recovery and abrasion resistance.

The shape retention of yarns affects the shape retention of fabrics, and the production of yarn with high shape retention is a key step in achieving shape retention of fabrics. At present, there are little studies on the shape retention of yarns, most researchers shave focused on shape retention of fabrics. Using the complete condensing Siro-spinning method to spin the core-spun yarn can improve the quality of the yarn. Compared with traditional ring-spinning yarns, the addition of the core yarn can improve the shape retention of the yarn.

This paper aims to improve knowledge regarding the complicated relationship among brand cultural symbolism, consumer cultural involvement, brand authenticity and consumer well-being. Although some literature has mentioned the relationship between the above concepts, these relationships have not been confirmed by empirical studies.

Based on the self-determination theory and the authenticity theory, a causal model of brand cultural symbolism, consumers’ enduring cultural involvement, brand authenticity and consumer well-being is developed. The structural equation model and multiple regressions are used to test the hypothesis. The primary data are based on an online survey conducted in China (N = 533). A total of six brands from the USA, France and China were selected as study samples.

The data reveal that brand cultural symbolism has a positive relationship with brand authenticity and consumer well-being; brand authenticity partially mediates the relationship between brand cultural symbolism and consumer well-being; and find a weakening effect of consumers’ enduring cultural involvement on the relationship between brand cultural symbolism and brand authenticity.

The weakening effect of consumers’ enduring cultural involvement on the relationship between brand cultural symbols and brand authenticity should be further verified through experiments and the model should be tested in different cultural backgrounds from a cross-cultural perspective.

The present study offers novel insights for brand managers by highlighting brand authenticity as the fundamental principle that explains the effect of cultural symbolism of brands, consumers’ enduring cultural involvement, as well as eudaimonic and hedonic well-being.

The findings suggest that cultural significance of a brand is closely related to brand authenticity and consumer well-being; however, on consumers with a highly enduring cultural involvement, the effect of brand culture symbolism and brand authenticity is weakened. This is an interesting finding because in this case, consumers may measure brand authenticity more based on the brand actual behavior (e.g. brand non-commercial tendency and brand social responsibility) rather than the symbolic image.

The study aims to devise a comprehensive evaluation model (CEM) for evaluating spatial equity in the layout of elderly service facilities (ESFs) to address the inequity in the layout of ESFs within city center communities characterized by limited land resources and a dense elderly population.

The CEM incorporates a suite of analytical tools, including accessibility assessment, Lorenz curve and Gini coefficient evaluations and spatial autocorrelation analysis. Utilizing this model, the study scrutinized the distributional equity of three distinct categories of ESFs in the city center of Xi’an and proposed targeted optimization strategies.

The findings reveal that (1) there are disparities in ESFs’ accessibility among different categories and communities, manifesting a distinct center (high) and periphery (low) distribution pattern; (2) there exists inequality in ESFs distribution, with nearly 50% of older adults accessing only 18% of elderly services, and these inequalities are more pronounced in urban areas with lower accessibility, and (3) approximately 14.7% of communities experience a supply-demand disequilibrium, with demand surpassing supply as a predominant issue in the ongoing development of ESFs.

The CEM formulated in this study offers policymakers, urban planners and service providers a scientific foundation and guidance for decision-making or policy amendment by promptly assessing and pinpointing areas of spatial inequity in ESFs and identifying deficiencies in their development.