Search results

1 – 10 of 344
Per page
102050
Citations:
Loading...
Access Restricted. View access options
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

Keywords

Access Restricted. View access options
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.

Details

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

Keywords

Access Restricted. View access options
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.

Details

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

Keywords

Access Restricted. View access options
Book part
Publication date: 10 February 2025

Loukia G. Tsaprouni

Air pollution poses a significant global threat to both human health and environmental stability, acknowledged by the World Health Organization as a leading cause of…

Abstract

Air pollution poses a significant global threat to both human health and environmental stability, acknowledged by the World Health Organization as a leading cause of non-communicable diseases (NCDs) and a notable contributor to climate change. This chapter offers a comprehensive review of the impacts of air pollution on health, highlighting the complex interactions with genetic predispositions and epigenetic mechanisms. The consequences of air pollution to health are extensive, spanning respiratory diseases, cardiovascular disorders, adverse pregnancy outcomes, neurodevelopmental disorders, and heightened mortality rates. Genetic factors play a pivotal role in shaping individual responses to air pollution, influencing susceptibility to respiratory illnesses and the severity of symptoms. Additionally, epigenetic changes triggered by exposure to pollutants have been linked to respiratory health issues, cancer development and progression, and even transgenerational effects spanning multiple generations. As countries, including the UK, pursue ambitious targets for reducing emissions, ongoing research into the complex interplay of air pollution, genetics, and epigenetics is essential. By unravelling the underlying mechanisms and advancing preventive and therapeutic strategies, we can protect public health and promote sustainable environmental practices in the face of this pervasive global challenge.

Details

Examining Net Zero: Creating Solutions for a Greener Society and Sustainable Economic Growth
Type: Book
ISBN: 978-1-83608-574-4

Keywords

Access Restricted. View access options
Article
Publication date: 22 February 2019

Ali Soltani, Andrew Allan, Ha Anh Nguyen and Stephen Berry

This paper aims to clarify the differences between students’ travel behaviours in Australia and China and the association between students’ environmental attitudes and their…

810

Abstract

Purpose

This paper aims to clarify the differences between students’ travel behaviours in Australia and China and the association between students’ environmental attitudes and their travel behaviours in both countries.

Design/methodology/approach

The paper extensively reviewed most of existing literature work on commuting patterns of higher education students with referring to different studies around the world and then used it to build a theoretical framework and conceptual model to relate the travel patterns of students to built environment, personal demographics and environmental knowledge/consideration. An online survey was used with 230 students at Mawson Lakes campus of University of South Australia and Beiyangyuan campus of Tianjin University (China). Statistical tests (i.e. mean test, one-way analysis of variance, factor analysis) were used to analyse the data.

Findings

The study reveals that a high dependence on private vehicles amongst students at the Mawson Lakes campus, whilst a more environmentally sustainable modal choice dominated at the Beiyangyuan campus. Those who studied at Mawson Lakes campus tended to have stronger involvement in environmental activities than their counterparts at Beiyangyuan campus, which presented a clear association between environmental awareness and the travel behaviours of the sampled students.

Research limitations/implications

The study focussed on two respective campuses of both universities in Australia and China. Future work could be expanded with students at all campuses of two universities.

Practical implications

The study affirmed the value of nurturing environmental awareness for students in both universities to encourage more environmentally sustainable travel behaviours amongst students. The paper provides policy recommendations such as establishing infrastructure, and facilities for new stream of mobility included sharing bike schemes, which would be very practical due to flexibility and cost effectiveness within University campuses. The paper attempted to transfer lessons from Chinese bike friendly society to Adelaide’s car dominated campus.

Originality/value

This study brings remarkable contributions as comparing university students’ travel behaviours in two different nations. It is the first one in Australia, which links the environmental concerns among university students with their travel behaviours. The paper was successful in getting the gap between theory and practice filled to some extent. The paper has a capability to be used as an evidence-base work in the area of sustainability education.

Details

International Journal of Sustainability in Higher Education, vol. 20 no. 1
Type: Research Article
ISSN: 1467-6370

Keywords

Access Restricted. View access options
Article
Publication date: 25 June 2024

Ali Rehman and Tariq Umar

This research paper explores the transformative potential of Industry 5.0 for environmental, social and governance (ESG) factors within corporate settings. This study aims to…

454

Abstract

Purpose

This research paper explores the transformative potential of Industry 5.0 for environmental, social and governance (ESG) factors within corporate settings. This study aims to elucidate the role of Industry 5.0 and its related technologies in influencing ESG factors, explore potential risks linked to ESG and present strategies for mitigation through Industry 5.0.

Design/methodology/approach

This paper is the literature review that introduces Industry 5.0 as a pivotal factor in implementing and mitigating ESG and its related risks. It outlines Industry 5.0's characteristics, driven by advanced technologies.

Findings

Literature reviews suggest that Industry 5.0 has the potential to significantly influence ESG factors within corporate settings. It can promote sustainability, enhance working conditions and offer operational advantages.

Practical implications

The practical implications of this research paper are twofold. First, it provides valuable insights to policymakers, organizations and regulatory bodies, guiding them in adapting their frameworks to embrace Industry 5.0. This adaptation is essential for achieving ESG goals and facilitating sustainable development. Second, it highlights the critical role of Industry 5.0 in mitigating ESG-related risks, offering a robust structure for sustainable development.

Originality/value

This research paper contributes to the existing body of knowledge by highlighting the transformative potential of Industry 5.0 in the context of ESG. It offers a comprehensive exploration of the historical evolution of corporate governance, the integration of sustainability and the growing focus on ESG. It also highlights the originality and value of Industry 5.0 as a critical mitigating factor for ESG-related risks, presenting a holistic approach to sustainable corporate practices.

Details

Corporate Governance: The International Journal of Business in Society, vol. 25 no. 2
Type: Research Article
ISSN: 1472-0701

Keywords

Access Restricted. View access options
Book part
Publication date: 18 December 2020

Amaranta Saguar García

More than 20 songs by Spanish and non-Spanish bands about the Castilian lord and epic hero Rodrigo Díaz de Vivar, El Cid, account for the topicality of the Hispanic Middle Ages in…

Abstract

More than 20 songs by Spanish and non-Spanish bands about the Castilian lord and epic hero Rodrigo Díaz de Vivar, El Cid, account for the topicality of the Hispanic Middle Ages in heavy metal. This chapter explores how diversely El Cid is addressed in 10 of these songs, in particular, from the perspectives of reception theory and both the cultural background of the band (Spanish or non-Spanish) and the language in which the lyrics are written (Spanish or English). Through detailed textual analysis and contextualisation, I will examine how, for Spanish (and Spanish-American) bands, El Cid serves the purpose of naturalising the stereotypical heavy-metal medieval knight, thereby functioning as a vindication of Hispanic cultural heritage within what is perceived to be an Anglo-American (and Germanic-Nordic) dominated musical scene. By contrast, non-Spanish bands resort primarily to El Cid to refresh the overused motif of the medieval knight, but sometimes in a more connoted manner as well, in which his iconic value as a Moor-slayer and a defender of the Western white Christian principles is highlighted. Moreover, I will discuss the appropriation and re-appropriation of El Cid by, respectively, non-Spanish and Spanish heavy metal bands, from the point of view of cultural appreciation and appropriation, and Islamophobia.

Details

Multilingual Metal Music: Sociocultural, Linguistic and Literary Perspectives on Heavy Metal Lyrics
Type: Book
ISBN: 978-1-83909-948-9

Keywords

Access Restricted. View access options
Article
Publication date: 19 September 2021

Jimena Y. Ramirez-Marin, Adrian Barragan Diaz and Felipe A. Guzman

Drawing from the emotions as social information theory, this paper aims to investigate the differential effects of emotions in inter vs intracultural negotiations.

511

Abstract

Purpose

Drawing from the emotions as social information theory, this paper aims to investigate the differential effects of emotions in inter vs intracultural negotiations.

Design/methodology/approach

The authors used one face-to-face negotiation and two experimental scenario studies to investigate the influence of emotions (anger vs happiness) and negotiation type (intercultural vs intracultural) on concession behavior.

Findings

Across the three studies, the results consistently show that angry opponents from a different national culture obtain larger concessions from negotiators. A face-to-face negotiation shows that happy opponents from the same culture are able to obtain larger concessions from negotiators. Additionally, the negotiator’s intentions to compromise and yield mediate the relationship between the interaction of emotions and counterpart’s culture on concessions.

Research limitations/implications

Two limitations are that the studies were conducted in a single country and that they use different types of role-playing designs. The empirical implications provide evidence of the moderating effect of the counterpart’s culture on the effect of anger on concessions. Then, providing two different mechanisms for concessions.

Practical implications

The research helps global negotiators who face counterparts from different nationalities. It suggests that these negotiators should be mindful of their counterpart’s emotions in intercultural negotiation as anger seems to generate more concessions in this setting.

Originality/value

The article is among the first studies to show that the combination of the counterpart’s culture and emotions has an effect on concessions in negotiation. Compromising and yielding are mediating mechanisms for this moderated effect. As opposed to previous studies that use one type of research design, the research combines face-to-face and scenario methodologies to test the predictions.

Details

International Journal of Conflict Management, vol. 33 no. 1
Type: Research Article
ISSN: 1044-4068

Keywords

Access Restricted. View access options
Book part
Publication date: 17 October 2022

Daniel Oviedo, Luis A. Guzman, Julian Arellana, Orlando Sabogal-Cardona, Carlos Moncada and Lynn Scholl

The effects of the COVID-19 pandemic on cities have transformed the lives of urban societies across the globe. One of such effects has been the redefinition of access and urban

Abstract

The effects of the COVID-19 pandemic on cities have transformed the lives of urban societies across the globe. One of such effects has been the redefinition of access and urban mobility patterns, exposing divides and inequalities along the lines of class, gender and social positions. In Latin America, long-term lockdowns and widespread containment-oriented restrictions have deepened already acute conditions of poverty and deprivation. Low-income and socially vulnerable households and individuals in countries such as Colombia find themselves unable, or in a disadvantaged position, to work from home, access goods and services securely and avoid transport modes that increase exposure to contagion. This chapter examines inequalities in urban mobility and access to essential opportunities in urban settings in Colombia, through data collected from 3,900 respondents to a web survey organised during the national lockdown in the country in April 2020. The chapter presents a Latent Class Analysis model exploring how intersecting differences in class, gender, ethnicity, age and other relevant socioeconomic characteristics, influence the degree of adaptability and capacity to adapt to the challenging conditions posed by COVID-19 for physical travel and carrying out everyday activities. Building on three distinct classes of mobility and access-related conditions, the chapter reflects on structural inequalities associated with Colombian cities’ urban form, functional and productive structures and its wide social gaps. The chapter builds on empirical findings to reflect on urban policy and discuss avenues for addressing social and spatial inequalities worsened by the pandemic.

Details

Transport and Pandemic Experiences
Type: Book
ISBN: 978-1-80117-344-5

Keywords

Access Restricted. View access options
Book part
Publication date: 27 September 2019

Edgar Muñiz-Avila, Geraldina Silveyra-Leon and Laura Alheli Segarra-Perez

It is well known that entrepreneurship is a complex phenomenon, which takes place under great uncertainty. Much of the existing research that explores the venture creation process…

Abstract

It is well known that entrepreneurship is a complex phenomenon, which takes place under great uncertainty. Much of the existing research that explores the venture creation process has assumed a linear, unitary process. The proposal presented in this chapter involves the venture creation process viewed as an iterative, non-linear, feedback-driven system called the Startup Path – a framework that brings together the entrepreneur as an individual, with its journey on the venture creation process.

Details

Innovation and Entrepreneurship: A New Mindset for Emerging Markets
Type: Book
ISBN: 978-1-78973-701-1

Keywords

1 – 10 of 344
Per page
102050