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Article
Publication date: 1 June 2004

Guzmán Díaz González, Javier Gómez‐Aleixandre Fernández and Pablo Arboleya Arboleya

In the past years, there has been an increasing concern about turn‐to‐turn faults in power transformers, due to the high costs that unexpected outages cause. It is not always…

630

Abstract

In the past years, there has been an increasing concern about turn‐to‐turn faults in power transformers, due to the high costs that unexpected outages cause. It is not always possible to analyse the transformer behaviour under such faults at rated conditions, since the tests are largely destructive. Therefore, models are of great importance to avoid severe damage to machines. In this paper, a model based on flux rearrangement around the damaged turn is presented. Two roles are assigned simultaneously to the damaged turn – i.e. the turn is seen as damaged but segregated from winding, and virtually undamaged belonging to the winding – and the damaged turn leakage flux is considered to be a coupling flux between the two roles. Thus, complex relations of magnetic couplings between the turn and the rest of the transformer are avoided, resulting in a very fast model, easy to develop further, which has been validated through a comparison with a finite element model.

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COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 23 no. 2
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 6 November 2023

John Fernando Macías-Prada, Yamila Silva and Ángela María Zapata

This study examines the role of universities in the social entrepreneurship ecosystems (SEEs) in Latin America from the perspective of female academic staff, administrators and…

330

Abstract

Purpose

This study examines the role of universities in the social entrepreneurship ecosystems (SEEs) in Latin America from the perspective of female academic staff, administrators and outreach workers of universities in the region.

Design/methodology/approach

Using a qualitative approach, the study scrutinises in-depth interviews conducted with 24 women from eight Latin American universities.

Findings

The findings underscore the pivotal role of universities in promoting social entrepreneurship through knowledge generation, entrepreneur training, network enhancement and the promotion of equity. They also highlight the importance of incorporating a gender perspective into university programmes and practices.

Research limitations/implications

The qualitative nature and small, diverse sample of this research inherently limit its scope. However, these limitations arise from the exploratory approach adopted, which was confined to eight Latin American countries. Further comparative studies in different contexts are needed to deepen the understanding of the dynamics involved.

Practical implications

Universities should offer more tangible support and training in social entrepreneurship with a gender focus. Governments can create incentives for universities to prioritise their contribution in this area.

Social implications

The study emphasises the potential of women-led social entrepreneurship initiatives to generate positive impact, underscoring the need for inclusive supportive environments.

Originality/value

By providing insights on the role of Latin American universities in SEEs from a gender perspective, this study contributes to limited literature on the intersection of social entrepreneurship, gender, higher education and geographic context in the region. The research underscores the need to further explore how gender and regional dynamics influence social entrepreneurial ecosystems.

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International Journal of Gender and Entrepreneurship, vol. 16 no. 1
Type: Research Article
ISSN: 1756-6266

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Book part
Publication date: 29 October 2024

Cristina Perales Franco

This chapter analyses, from the perspective of inclusion, the possibilities of participation for families in basic education schools in Mexico. Based on the analysis of articles…

Abstract

This chapter analyses, from the perspective of inclusion, the possibilities of participation for families in basic education schools in Mexico. Based on the analysis of articles published between 2012 and 2022, complemented by an analysis of normative instruments, the main patterns related to policies, practices and cultures were explored. The outcomes highlight a lack of recognition and appreciation of the diversity of families, restricted spaces and forms for their participation and cultural patterns that hinder their inclusion. The bases to favour inclusion are recognised and four key axes are proposed for its strengthening.

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Intercultural and Inclusive Education in Latin America
Type: Book
ISBN: 978-1-83753-141-7

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Book part
Publication date: 15 February 2021

Raquel Chafloque-Cespedes, Aldo Alvarez-Risco, Paula-Viviana Robayo-Acuña, Carlos-Antonio Gamarra-Chavez, Gabriel-Mauricio Martinez-Toro and Wagner Vicente-Ramos

This chapter is designed with the aim to determine the influence of sociodemographic variables on the capacity to generate social enterprises, such as sex, the student’s country

Abstract

This chapter is designed with the aim to determine the influence of sociodemographic variables on the capacity to generate social enterprises, such as sex, the student’s country, if only they study or if they study and work, as well as if they participate or direct a social enterprise in university students of Latin American business schools. This research adopted an inductive quantitative approach using a questionnaire. The participants were university students of business schools from Colombia, Mexico and Peru. Second-generation structural equation method (SEM-PLS) was used to analyse the results, using the SmartPLS 3.2.7 software applied to data on 3,739 university students. The results suggest that the entrepreneur role, labour situation, country and sex have a moderating effect in the relation between entrepreneurial orientation and entrepreneurial intention. Also, by using resampling technique Bootstrapping (5,000 times,p < 0.01), significance of the trajectory coefficients (beta) and effect size of the coefficients (beta) were measured to demonstrate significance. Finally, with this research the authors ascertain that entrepreneurial orientation positively influences entrepreneurial intention. thus explaining 42.4% of its variance. This chapter is the first attempt on investigating in university students of Latin American business schools about factors of entrepreneurship orientation and entrepreneurship intention, and has strong potential to contribute to development of policies and strategies to promote the growth of entrepreneurship activities in the universities.

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Universities and Entrepreneurship: Meeting the Educational and Social Challenges
Type: Book
ISBN: 978-1-83982-074-8

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Article
Publication date: 1 September 2005

Guzmán Díaz, Pablo Arboleya and Javier Gómez‐Aleixandre

Differential relaying is one of the most widely used techniques for protecting power transformers. The purpose of this paper is to discuss and cover a developed methodology for…

509

Abstract

Purpose

Differential relaying is one of the most widely used techniques for protecting power transformers. The purpose of this paper is to discuss and cover a developed methodology for analyzing the signals obtained from the differential protection of power transformers.

Design/methodology/approach

The differential signal obtained from the protective relays of power transformers is analyzed in this paper, in order to establish a relation between time‐dependent symmetrical components and space vectors. As a result of the formulation of such a relation, specific patterns are obtained and classified for the plot of the space vector during fault and inrush conditions.

Findings

What was found in the course of the work? This will refer to analysis, discussion, or results. It has been found that the discrimination between inrush and fault conditions is possible by observing a characteristic asymmetry in the plots of the space vector. A method for dealing with the said asymmetries based on the absolute value of the space vector as obtained from the differential signal is proposed and discussed. The theoretical approaches given in the paper are further validated through finite element simulations and laboratory tests, which include linear and non‐linear loads, in order to account for more severe exploitation conditions.

Research limitations/implications

A complete protective algorithm can be developed from the analysis of the methodology proposed, which avoids the spectral analysis, since the methodology is based in pattern analysis rather that in the latter technique.

Practical implications

The methodology provides faster identification of the fault during inrush condition, since the spectral analysis is prevented.

Originality/value

It may be stated that the major contribution of the paper is the methodology proposed for identifying internal faults in power transformers using pattern characterization of the plot of the space vector.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 24 no. 3
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 21 February 2020

Gonzalo Maldonado-Guzmán and Jose Arturo Garza-Reyes

Eco-innovation is a relatively recent construct in the literature, which nowadays more and more researchers and academics consider as one of the strategies that generate a higher…

786

Abstract

Purpose

Eco-innovation is a relatively recent construct in the literature, which nowadays more and more researchers and academics consider as one of the strategies that generate a higher level of sustainable and business performance. However, little is known about the influence of eco-innovation practices on sustainable performance and business performance, particularly in the automotive and auto parts industry. Therefore, this paper aims to fill this knowledge gap and explore the aforementioned interdependence.

Design/methodology/approach

The influence of eco-innovation practices on sustainable performance and business performance is investigated through a research framework consisting of 5 constructs, 25 items and 6 hypotheses derived from an extensive review of the literature. A self-administered questionnaire was distributed to 460 companies in the automotive and auto parts industry in Mexico. The data were analyzed through a confirmatory factor analysis, descriptive statistics and structural equation modeling.

Findings

The results obtained indicated that eco-innovation practices have a positive influence on both sustainable performance and business performance in the automotive and auto parts industry.

Originality/value

This paper provides further insightful evidence of the influence of eco-innovation practices on sustainable performance and business performance, particularly in the automotive and auto parts industry.

Details

International Journal of Innovation Science, vol. 12 no. 1
Type: Research Article
ISSN: 1757-2223

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Article
Publication date: 21 June 2023

María Eugenia Cardenal, Octavio Díaz-Santana and Sara M. González-Betancor

The teacher role in the classroom can explain important aspects of the student's school experience. The teacher-student relationship, a central dimension of social capital…

545

Abstract

Purpose

The teacher role in the classroom can explain important aspects of the student's school experience. The teacher-student relationship, a central dimension of social capital, influences students' engagement, and the teaching style plays an important role in student outcomes. But there is scarce literature that links teaching styles to teacher-student relationship. This article aims to (1) analyze whether there is a relationship between teaching styles and the type of relationship perceived by students; (2) test whether this relationship is equally strong for any teaching style; and (3) determine the extent to which students' perceptions vary according to their profile.

Design/methodology/approach

A structural equation model with four latent variables is estimated: two for the teacher-student relationship (emotional vs educational) and two for the teaching styles (directive vs participative), with information for 21,126 sixth-grade primary-students in 2019 in Spain.

Findings

Teacher-student relationships and teaching styles are interconnected. The participative style implies a better relationship. The perceptions of the teacher are heterogeneous, depending on gender (girls perceive clearer than boys) and with the educational background (children from lower educational background perceive both types of teaching styles more clearly).

Originality/value

The analysis is based on the point of view of the addressee of the teacher's work, i.e. the student. It provides a model that can be replicated in any other education system. The latent variables, based on a periodically administered questionnaire, could be estimated with data from diagnostic assessments in other countries, which in turn would allow the formulation of context-specific educational policy proposals that take into account student feedback.

Details

Journal of Professional Capital and Community, vol. 8 no. 3
Type: Research Article
ISSN: 2056-9548

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Book part
Publication date: 5 December 2018

Lisa-Mari Coughlan and Melville Saayman

Tourism is a key source of income to South Africa. Food and beverages is a key part of tourism and the literature reveals that tourists spend up to a quarter of their budget on…

Abstract

Tourism is a key source of income to South Africa. Food and beverages is a key part of tourism and the literature reveals that tourists spend up to a quarter of their budget on cuisine. South Africa has, however, been rated as the least-prepared culinary travel destination and the travel destination with the greatest potential for growth. Therefore, a segmentation taxonomy based on culinary preferences of international tourists to South Africa is put forth which can be used to prepare South Africa as a culinary travel destination. The 627 international tourists surveyed were divided into five segments with the use of factor analyses, t-tests, Spearman rank correlations and analysis of variance. The segments were named conservationists, experience seekers, devotees, explorers and socialisers (CEDES taxonomy). Multiple results and implications are discussed in the paper.

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School Improvement Networks and Collaborative Inquiry: Fostering Systematic Change in Challenging Contexts
Type: Book
ISBN: 978-1-78769-738-6

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Book part
Publication date: 14 December 2023

Ruiping Ren

This study attempts to identify and explicate the unique segmentation of the increasingly growing virtual reality (VR) user market based on the user experience. Consequently, it…

Abstract

This study attempts to identify and explicate the unique segmentation of the increasingly growing virtual reality (VR) user market based on the user experience. Consequently, it collects five hundred forty-five online survey questionnaires through the Prolific platform and deploys cluster analysis to identify mutually exclusive groups of VR users. The research variable, user experience, contains 16 indicators explained by four dimensions. As a result, this study is able to unveil three mutually exclusive markets which are labeled as (1) beginner, (2) aficionado, and (3) utilitarian. The unique features of these three groups are further compared based on their VR tour behaviors. In the conclusion section, it offers managerial implications for devising novel marketing strategies.

Details

Advances in Hospitality and Leisure
Type: Book
ISBN: 978-1-83753-090-8

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