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Presently, a wide range of polyurethane adhesives can be obtained using different kinds of polyols and isocyanates. However, the applied temperature of the polyurethane adhesive is not more than 80°C. The film of polyurethane adhesive will be softened and deformed when its applied temperature is more than 100°C. Thus, the mechanical property of the polyurethane adhesive is decreased clearly, which limits its further application. The purpose of the study is to improve the heat resistance of polyols, especially polyester polyols and its resultant polyurethane adhesives.

The more rigid benzene ring is introduced into the polyester polyols to improve the heat resistance of its resultant polyurethane adhesive.

The more rigid benzene ring has ben introduced into the polyester polyols and the heat resistance of its resultant polyurethane adhesive is improved.

The polyester polyols with more rigid benzene ring have been prepared successfully by the vacuum melting method when diethylene glycol, neopentyl glycol, 1,6-hexanediol, ethanediol, isophthalic acid, terephthalic acid, sebacic acid and adipic acid are used as raw materials and tetra-isopropyl titanate is adopted as the catalyst.

Motivated by the globally increasing concern over environmental protection, the interest of a large part of the scientific community focuses on the development of green surfactants aiming to replace traditional toxic surfactants-based alternatives. The purpose of this paper is to prepare acrylate copolymer latex modified with fluorine and silicone monomer, which is emulsified with the green surfactants of sodium rosinate and alkyl polyglycoside (APG).

A series of acrylic copolymer latexes containing fluorine–silicon have been prepared by semi-continuous seed emulsion polymerisation of mixed monomers of methyl methacrylate (MMA), butyl acrylate (BA), hexafluorobutylmethacrylate (HFMA) and vinyltriethoxysilane (VTES) and emulsified by green mixed surfactants of sodium rosinate and APG.

The optimum recipe of preparing the emulsion is as follows: the amount of emulsifiers is 6 per cent and the mass ratio of sodium rosinate to APG is 1:3. The amount of initiator is 0.4 per cent, and the amounts of the silicon monomer and fluorine monomer are 5 and 7 per cent, respectively. In comparison with the acrylate latex prepared without fluorine monomer and silicon monomer, the thermal stability and the water resistance of the film of the resultant latex clearly improved.

The acrylic copolymer latexes containing fluorine–silicon emulsified with green surfactants can be used in the coatings, adhesives, finishing agents and so on.

The acrylic copolymer latexes containing fluorine–silicon have been prepared by semi-continuous seed emulsion polymerisation. The green mixed surfactants of sodium rosinate and APG have been used as the emulsifiers to replace traditional toxic surfactants-based alternatives.

The technical level of aircraft failure analysis plays a special role in ensuring the safety of civil aviation flight. Using appropriate methods for functional failures analysis can provide a reliable reference for aircraft safety. The purpose of this paper is to provide a new and comprehensive measure based on conventional functional hazard analysis (FHA) and grey system theory to analysis and evaluate the class that each failure belongs to.

This paper integrates multiple methods including the FHA, the fixed weight cluster, the Delphi method and the analytic hierarchy process (AHP). To begin with, use FHA method to sort out the corresponding failure states of a certain system from the perspective of function and determine the evaluation index. And then using group decision and AHP, determine the expert weight and index weight in the fixed weight cluster. The fixed weight cluster function is used to determine the grey class to which a certain functional failure belongs in the complex system.

In the past, the risk assessment of aircraft was mostly dominated by the subjective judgment of the experts, but it was not possible to give an objective observation score for each failure state. This paper addresses the problem efficiently as well as the feature of “little data, poor information.” The risk degree of each failure state can ultimately be replaced by a quantitative value.

This paper uses the idea of clustering in grey system theory to evaluate the risk of landing gear system. In the expert evaluation stage, different experts evaluated the impact degree of the aircraft's failure caused by its functions, so the final risk classification is subjective to some extent.

This study analyzed the different conditions of the landing gear, including the front wheel steering, front wheel damping, front wheel steering system, brake system fault information and so on. It can effectively divide the different failure states and their effects, which is helpful to improve the safety of aircraft landing gear system and provide some useful methods and ideas for studying the safety of aircraft systems.

Based on the FHA analysis process and the grey system theory, this paper determines various potential risks and their consequences of various functions according to the hierarchy, so as to carry out further detailed analysis on the risks that may occur under various functional conditions and take certain measures to prevent them. It is helpful to improve the risk management and control ability of aircraft in the actual flight process and to guarantee the safety of people's lives and property.

This paper is a pioneer in integrating the FHA method and the grey system theory, which exactly can be used to address the problem with the character of “little data, poor information.” The model established in this paper for the defects of FHA can effectively improve the accuracy of FHA, which is of great significance for the study of safety. In this paper, a case about landing gear system is given to illustrate the effectiveness of the model.

The classification of aircraft failures has been a significant part of functional hazard analysis (FHA). Aiming at the shortcomings of the traditional FHA method in the evaluation of aircraft risk, the purpose of this paper is to put forward a new approach by combining the gray comprehensive relation calculation method in the gray system theory with the traditional FHA in order to deal with the problem of “little data, poor information.”

This paper combines FHA, 1–9-scale method and gray relation analysis. At first, aircraft failure scenarios are chosen and data from experts are collected; then gray system theory is applied to find the relevance of such scenarios. Finally, the classification according to relevance is determined.

In the past, “little data, poor information” made it difficult for researchers to implement FHA. In this paper, the authors manage to deal with the problem of “poor information” and provide an approach to find the seriousness of aircraft failure.

Due to the use of expert-evaluating methods, the classification of failures is still a little subjective and can be improved in this area. In the future, the method can be improved from the perspective of combining FMEA to analyze more complex indicators or using multisource heterogeneous solutions to solve fuzzy numbers, probabilities, gray numbers and indicators that cannot be assigned.

The paper uses FHA to divide the failure state and establishes a gray evaluation model of the aircraft failure state classification to verify the relevant method. Some aircraft safety design requirements are used to check the safety hazards of the aircraft during the design process, and to provide rational recommendations for the functional design of the aircraft.

Improving the safety of aircraft is undoubtedly of great practical significance and has become a top priority in the development of the civil aviation industry. In this paper, the FHA method and the failure state of the aircraft are studied. The original FHA method is innovated by using the gray system theory applicable to the poor information state. Therefore, to some extent, this study has significance for improving the safety of civil aircraft flight, ensuring people’s travel safety and enhancing the society’s trust in civil aviation.

The main innovation of this paper is integrating the FHA method and the gray system theory. This study calculates the comprehensive relation degree of each failure under different flight stages, and uses FHA to divide the failure state, and finally establishes a gray evaluation model of the aircraft failure state classification to analyze the different conditions of the landing gear brake system, so that it improves the present situation, and the problem with the character of “little data, poor information” can be addressed better.

This study aims to develop a measurement scale of tourism-led rural gentrification from the perspective of rural residents.

The procedure for developing the measurement scale included a thorough review of related literature on tourism-led rural gentrification and multiple stages of qualitative and quantitative investigations. A total of 1,080 rural residents in Huzhou and Huangshan participated in the project. The semi-structured interviews and questionnaire were applied to collect the data. This study analyzed the data with the methodologies of exploratory factor analysis, confirmatory factor analysis and structural equation modeling.

The measurement scale developed in this study included seven dimensions: Accelerated Ecological Awareness, Individual Behavior, Rural Economic Development, Enhanced Living Standards, Talents and Demographic Changes, Human and Cultural Shift and Cohesive Community.

This measurement scale was developed and validated in China and may not be relevant in other contexts. The scale focuses on tourism-led rural gentrification only from the perspective of rural residents. The findings broaden the knowledge on tourism-led rural gentrification by researching the topic from the point of view of rural residents.

For policymakers and tourism enterprises, this study provides a valuable index for a full understanding of tourism-led rural gentrification. For investors, the research offers insights for priority investments to advance tourism development in rural regions.

This study is one of the few attempts to empirically measure tourism-led rural gentrification. The results improve on the knowledge about tourism-led rural gentrification in China.

本研究的主要目的是从居民视角开发和验证旅游引导的乡村绅士化测量量表。

开发和验证旅游引导的乡村绅士化测量量表主要包含两方面的工作：旅游引导的乡村绅士化相关文献梳理; 多阶段的定量和定性研究。本研究共邀请1080位研究对象参与调研, 并通过深度半结构访谈和调查问卷收集数据, 使用EFA、CFA和SEM等研究方法研究结果。

本研究开发和验证的测量量表包括7个维度：文明素养感知、经济发展感知、生活水平感知、发展环境感知、社会风尚感知、人居环境感知和社区秩序感知。

本研究基于中国背景开发和验证了旅游引导的乡村绅士化测量量表, 未验证该量表在其他国家或地区的普适性, 且仅从居民视角展开研究。我们的研究结果丰富了旅游引导的乡村绅士化内容。

对于政策制定者和旅游企业来说, 本研究为他们充分了解旅游引导的乡村绅士化提供了参考; 对投资者来说, 本研究为投资者投资提供了有价值的借鉴和参考。

本研究是测量旅游引导的乡村绅士化的重要尝试, 丰富了对中国旅游引导的乡村绅士化的认识。

旅游引导的乡村绅士化 居民感知 量表开发 量表验证

文章类型： 研究型论文

El objetivo principal del presente estudio es desarrollar y validar una escala de medición de gentrificación rural impulsada por el turismo desde la perspectiva de los residentes.

El desarrollo y la validación de la presente escala de medición consistió en dos tareas principales: un examen de la literatura relacionada con la gentrificación rural impulsada por el turismo; y múltiples etapas de investigación cuantitativa y cualitativa. Para este estudio, se invitó a un total de 1080 sujetos para participar de esta investigación, los datos se obtuvieron mediante entrevistas y cuestionarios semiestructurados en profundidad, y los resultados se han analizado mediante EFA, CFA y SEM.

La escala de medición desarrollada y validada en este estudio consta de 7 dimensiones: percepción de alfabetismo civilizacional, percepción de desarrollo económico, percepción de nivel de vida, percepción de entorno de desarrollo, percepción de costumbres sociales, percepción de asentamiento humano y percepción de orden comunitario.

Este estudio desarrolló y validó la escala de medición basada en un contexto chino, pero no se pudo generalizar la escala de medición en otros países o regiones. Esta investigación solo analiza el fenómeno de gentrificación rural impulsada por el turismo desde la perspectiva de los residentes. Nuestros resultados contribuyen a mejorar el contenido de la gentrificación rural impulsada por el turismo.

Para los responsables políticos y las empresas de turismo, la presente investigación constituye una referencia para que comprendan plenamente la gentrificación rural impulsada por el turismo; para los inversores, constituye una valiosa referencia de inversión.

Este estudio es un importante intento para medir la gentrificación rural impulsada por el turismo y contribuye a enriquecer la comprensión de la gentrificación rural impulsada por el turismo de China.

Gentrificación rural impulsada por el turismo, Percepción de los residents, Desarrollo de la escala, Validación de la escala

Trabajo de investigación

This paper aims to propose a hospitality and tourism live-streaming (HTLS) experience cocreation model based on a critical reflection of extant literature to capture the governing structure of HTLS experiences and reveal the mechanisms under which HTLS works.

To ensure that critical reflections and insights produced by this study are meaningful and contribute to the body of knowledge and practices, the authors have adopted a robust methodology comprising systematic searching, evaluating and conceptualizing.

A conceptual model is developed around three critical and intimately related domains of HTLS experiences: the governing framework of HTLS content cocreation based on stakeholder theory; the structural relationships between HTLS content, IT affordance and HTLS experiences; and the conceptual structure of HTLS experiences based on personal engagement theory.

Several practical implications follow from this study. First, it is critical to understand that both HTLS content and experience are affected by multiple stakeholders. Second, stakeholder interactions and cocreation determine consumer experiences. Third, practitioners should take advantage of the understanding of HTLS stakeholder attributes. Fourth, attention should be paid to IT affordance. And lastly, a tiered structure appears to govern consumer engagement in HTLS.

Live-streaming studies are still in their infancy stage in hospitality and tourism, with only nine papers related to HTLS published in peer-reviewed journals until May 2022. This study reviewed a carefully selected collection of 15 live-streaming-related articles and proposed a conceptual HTLS experience cocreation model. Moreover, the existing studies in live streaming are synthesized, with important themes identified, as well as practical and theoretical trends explored.

The overuse and scarcity of resources emphasize the importance of the circular economy. The technology facilitated by Industry 4.0 stimulates the implementation of the circular economy that aims to reduce resource use and enhance operational efficiency. This study focuses on enhancing delivery efficiency in an online-to-offline (O2O) context from an Industry 4.0 technology-facilitated personal configuration perspective, that is, comparing in-house and crowdsourced delivery efficiency in China's O2O on-demand food delivery context.

The authors collect 128,152 orders from 38 restaurants of an online restaurant chain in China. The authors adopt multiple regression analysis to examine the delivery efficiency gap between in-house and crowdsourced deliverymen and the determinants of this efficiency gap.

The findings of this study reveal that crowdsourced deliverymen exhibit higher delivery efficiency, in terms of a shorter delivery time, than in-house deliverymen. In addition, the authors find that platforms providing monetary incentives or implementing late delivery penalties enlarge this efficiency gap. Furthermore, the authors show that external factors, such as working on weekends and bad weather conditions, contribute to the narrowing of this performance efficiency.

The study's findings suggest that platforms should use advanced technologies facilitated by Industry 4.0 to optimize their personnel configuration to enhance their delivery efficiency and reduce carbon emissions. The effective approaches include using financial incentives and improving working schedules.

The authors' findings contribute to the online fulfillment literature by focusing on delivery efficiency in the O2O context from the Industry 4.0 technology-facilitated personnel configuration perspective. The authors examine how internal and external factors moderate the performance efficiency between these two types of deliverymen.

The success of online health communities (OHCs) depends on maintaining long-term relationships with physicians and preventing churn. Even so, the reasons for physician churn are poorly understood. In this study, an empirical model was proposed from a social influence perspective to explore the effects of online social influence and offline social influence on physician churn, as well as the moderating effect of their online returns.

The empirical data of 4,145 physicians from a Chinese OHC, and probit regression models were employed to verify the proposed theoretical model.

The results suggest that physicians' churn intention is influenced by online and offline social influences, and the offline social influence is more powerful. Physicians' reputational and economic returns could weaken the effect of online social influence on churn intention. However, physicians' economic returns could strengthen the effect of offline social influence on churn intention.

This research study is the first attempt to explore physician churn and divides the social influence into online and offline social influences according to the source of social relationship. The findings contribute to the literature on e-Health, user churn and social influence and provide management implications for OHC managers.

The purpose of this paper is to explore financial quality problems, based on the dynamics of the ownership structure, in the privatization process to clarify the internal relation among the ownership’s attribution of the commercial mixed ownership company, the company’s performance and its financial relationships. This paper also examines the mixed ownership enterprise’s potential problems during the development process.

Adopting the single case study method, the authors selected the mixed ownership public company Hubei Sanxia New Building Materials Co., Ltd. (stock code: 600293) to explore, from a privatization perspective, the impact of mixed ownership on financial quality.

The study found that Sanxia experienced tight cash flow and heavy debt burdens due to the privatization and that its controlling shareholders used non-operating income to support Sanxia, thus characterizing the dual role of “the grabbing hand” and “the helping hand.” Sanxia’s privatization process highlighted the volatility of performance, the exception of monetary funds and the existence of accounting fraud rather than the prosperous development of the capital combination.

These findings provided case support that privatization negatively affects the financial quality of the company. Previous studies have indicated that there should be greater focus more on the issue that state-owned shares rebound during the process of privatization and that, with respect to commercial mixed ownership reform of state-owned enterprises, such reform must avoid the passive transfer of corporate control, ensure the fairness of the related transactions, prevent the loss of state-owned assets and preclude the controlling shareholders from seizing interests of listed companies.

The purpose of this paper is to investigate the influence of state shareholding and control versus institutional investors on tax aggressiveness of Chinese listed firms.

By exploring recently available tax reconciliation data required under 2006 Accounting Standards for Business Enterprises on a sample of Chinese A-share listed firms, the authors calculate a direct measure of tax aggressiveness and investigate the influence of firm ownership structure on their tax aggressiveness.

The authors find that state ownership and control are positively associated with corporate tax aggressiveness. A positive link between the collective shareholding by the top ten shareholders and firm tax aggressiveness is also found. In contrast, institutional share ownership is negatively associated with corporate tax aggressiveness.

The results indicate that political connections and ownership concentration empower firms to pursue aggressive tax planning, whereas institutional investors partially mitigate such influences.

This paper complements recent studies on tax aggressiveness in the USA by analyzing tax planning activities of Chinese listed firms. The authors highlight firm ownership and control factors that encourage aggressive tax planning in China. This paper has important implications for both public policy and corporate governance in emerging markets similar to China.