Search results

The purpose of this paper is to present a finite element approximation of the low Mach number equations coupled with radiative equations to account for radiative heat transfer. For high-temperature flows this coupling can have strong effects on the temperature and velocity fields.

The basic numerical formulation has been proposed in previous works. It is based on the variational multiscale (VMS) concept in which the unknowns of the problem are divided into resolved and subgrid parts which are modeled to consider their effect into the former. The aim of the present paper is to extend this modeling to the case in which the low Mach number equations are coupled with radiation, also introducing the concept of subgrid scales for the radiation equations.

As in the non-radiative case, an important improvement in the accuracy of the numerical scheme is observed when the nonlinear effects of the subgrid scales are taken into account. Besides it is possible to show global conservation of thermal energy.

The original contribution of the work is the proposal of keeping the VMS splitting into the nonlinear coupling between the low Mach number and the radiative transport equations, its numerical evaluation and the description of its properties.

The purpose of this paper is to describe a variational multiscale finite element approximation for the incompressible Navier‐Stokes equations using the Boussinesq approximation to model thermal coupling.

The main feature of the formulation, in contrast to other stabilized methods, is that the subscales are considered as transient and orthogonal to the finite element space. These subscales are solution of a differential equation in time that needs to be integrated. Likewise, the effect of the subscales is kept, both in the nonlinear convective terms of the momentum and temperature equations and, if required, in the thermal coupling term of the momentum equation.

This strategy allows the approaching of the problem of dealing with thermal turbulence from a strictly numerical point of view and discussion important issues, such as the relationship between the turbulent mechanical dissipation and the turbulent thermal dissipation.

The treatment of thermal turbulence from a strictly numerical point of view is the main originality of the work.

We present a critical literature review debating Brazilian research on social and environmental accounting (SEA). The aim of this study is to understand the role of politics in the construction of hegemonies in SEA research in Brazil. In particular, we examine the role of hegemony in relation to the co-option of SEA literature and sustainability in the Brazilian context by the logic of development for economic growth in emerging economies. The methodological approach adopts a post-structural perspective that reflects Laclau and Mouffe’s discourse theory. The study employs a hermeneutical, rhetorical approach to understand and classify 352 Brazilian research articles on SEA. We employ Brown and Fraser’s (2006) categorizations of SEA literature to help in our analysis: the business case, the stakeholder–accountability approach, and the critical case. We argue that the business case is prominent in Brazilian studies. Second-stage analysis suggests that the major themes under discussion include measurement, consulting, and descriptive approach. We argue that these themes illustrate the degree of influence of the hegemonic politics relevant to emerging economics, as these themes predominantly concern economic growth and a capitalist context. This paper discusses trends and practices in the Brazilian literature on SEA and argues that the focus means that SEA avoids critical debates of the role of capitalist logics in an emerging economy concerning sustainability. We urge the Brazilian academy to understand the implications of its reifying agenda and engage, counter-hegemonically, in a social and political agenda beyond the hegemonic support of a particular set of capitalist interests.

This study aims to understand the role that family protocol can have in the succession planning process of family businesses.

For this purpose, the authors decided on a qualitative approach and performed an exploratory case study in Portugal: one firm with a family protocol. As data collection techniques, interviewing, direct observation and documentary analysis were used.

Based on the empirical evidence, it is concluded that a family protocol can help succession planning and favour the continuity and survival of the family business.

This study shows the relevance of a family protocol for the succession process that seems to be at the basis of family firms’ continuity, survival and minimising their failure.

Although family firms are many in number and central in the dynamics of the world economy, the family protocol has not been approached as a determinant of a successful succession process. This holds particularly for the realm of family firms.

The main objective of this study is to understand the role that family council and protocol can have in the planning process of family companies.

To reach this general objective, the qualitative approach was used using multiple case studies: seven Portuguese family companies. Data collection techniques, interviewing, direct observation and documentary analysis were used.

Based on the empirical evidence, it is concluded that the family council and family protocol help succession planning and favour the continuity and survival of the family business. However, other working groups also support the entire planning process, such as the cousin generation meeting and the New Generation Monitoring Committee (or Mentoring Committee). The development of future personal plans for the younger generations may lie in this Committee, which assists and guides the younger family members.

This study is pioneering in Portugal because it analyses the use of new instruments that helps the succession planning process in family firm context: the family council and family protocol. These managerial mechanisms allow to achieve the success, allowing family conflicts to be minimized, the continuity of family firms and avoiding their mortality.

The study contributes to increasing knowledge about the family council, the family protocol, family firm succession and its planning. It is important and innovative by studying those topics in depth, their connection being little explored in the literature. This study can be seen as a benchmarking for governance practices in other countries.

This paper aims to address the limitations in designing educational approaches that apply critical approaches to data literacy, given the obscure nature of digital platforms, which leave youth unable to develop discourses that challenge dominant narratives about the role of data in their lives. The purpose of this study is to propose and evaluate a critical data literacy approach that empowers youth to engage with data from a sociocultural perspective using a speculative participatory research approach that affords opportunities to develop alternative discourses.

This is a multiple-case study that involves five alternative schools in Uruguay which implemented the Nayah-Irú curriculum over ten weeks leading to the development of six distinct research projects about the materialization of data in youth lives. The curriculum incorporates an alternate reality game (ARG) to engage youth in critical data literacy, based on the principles of Youth Participatory Action Research (YPAR) epistemology and Speculative Civic Literacies.

The findings of this study highlight the integration of speculative storytelling and real-life experiences in developing alternative discourses about datafication. The analysis revealed instances of discursive closure among the youth, but through the curriculum's speculative fiction elements, such as the narrative of Nayah-Irú, emotional connections were formed, leading to increased engagement, critical inquiry, and problem framing.

The study conducted on the Nayah-Irú curriculum shows its effectiveness in engaging youth and educators in critical data literacy by affording opportunities for youth to engage in the analysis of their personal data literacies in an alternative world. Bringing speculative approaches to data literacy can open new avenues for exploring data literacy with youth in ways that center their voices and help them overcome different forms of discursive closure.

This study offers new insights into critical data literacy education blending youth participatory action research epistemologies with a speculative literacies framework to support youth in developing alternative discourses regarding the role of data in their lives.

The aim of this study is to examine the behavioral intention (BI) to adopt the Coinbase Wallet by Spanish users.

A survey was administered to individuals residing in Spain between March and April 2021. There were 301 questionnaires analyzed. This research applies a new predictive model based on technology acceptance model (TAM) 2, the unified theory of acceptance and use of technology (UTAUT) model, the theory of perceived risk and the commitment trust theory. A mixed partial least squares structural equation modeling (PLS-SEM)/fuzzy-set qualitative comparative analysis (fsQCA) methodology was employed for the modeling and data analysis.

The results showed that all the variables proposed have a direct and positive influence on the intention to use a Coinbase Wallet. The findings present clear directions for traders, investors and academics focused on improving their understanding of the characteristics of these markets.

First, this study addresses important concerns relating to the adoption of crypto-wallets during the global pandemic. Second, this research contributes to the existing literature by adding electronic word of mouth (e-WOM), trust, web quality and perceived risk as new drivers of the intention to use the Coinbase Wallet, providing unique and innovative insights. Finally, the study offers a solid methodological contribution by integrating linear (PLS) and nonlinear (fsQCA) techniques, showing that both methodologies provide a better understanding of the problem and a more detailed awareness of the patterns of antecedent factors.

This study aims to examine the nature and trends in sustainability education and climate change (SECC) in higher education using a comprehensive bibliometric analysis of the literature indexed in the Scopus database.

Data were extracted from the Scopus database using the keywords “sustainability education” and “climate change” to ensure extensive coverage. Total 14,465 research papers on both topics were analyzed using the VOSviewer software.

The bibliometric analysis reveals the mapping of scientific research across countries and the cooccurrence of research keywords, providing insights into research trends and future directions in SECC in higher education.

Based on the thematic map created to highlight future research directions on curricula for SECC in higher education, the analysis has identified several potential research areas, such as interdisciplinary research, transformative education, carbon footprint, students and higher education community well-being, climate change mitigation curriculum and behavioral studies.

This analysis offers epistemological foundations for generating knowledge and advancing curricula for SECC in higher education institutions.

This chapter presents the case of the coffee-growing region located in the southern portion of the state of Chiapas, along the Guatemalan border. This region was relatively prosperous until the 1980s, thanks in part to price support programs established through international coffee agreements. A short supply of labor attracted farm workers from adjacent regions. These were seasonal, undocumented workers who arrived from Guatemala and whose status of illegal immigrants fostered their exploitation. The liberalization of the international coffee market combined with a sharply reduced state intervention engendered the control over coffee production by a few transnational companies and the collapse of the economy of small producers. Combined with natural disasters whose effects were not addressed by the neoliberal state, this situation caused the region to be bypassed by Guatemalan labor that now prefers direct migration to the United States. This region also has been transformed into an increasingly underdeveloped area affected by outmigration. Chiapas has become a long vertical border for undocumented Central American workers as Mexican migration policy has toughened following the establishment of the US national security policy. In this sense, there is a stark contrast between the mobility of financial and commercial capital and the ease with which both move in and out from the region, and the obstacles imposed on labor mobility.