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Article
Publication date: 2 March 2015

Bruno R. O. Baptista, André M.S. Mendes and Sérgio M.A. Cruz

The purpose of this paper is to present a comparative study of the thermal behavior and efficiency of an induction motor fed by a fault-tolerant Three-Level Neutral Point Clamped…

Abstract

Purpose

The purpose of this paper is to present a comparative study of the thermal behavior and efficiency of an induction motor fed by a fault-tolerant Three-Level Neutral Point Clamped (3LNPC) inverter, under normal conditions as well as after a post-fault reconfiguration, following an open-circuit fault in the inverter. For this purpose, a Matlab/Simulink model and three-phase induction motor models using a finite element method (FEM) software were developed. Besides, some experimental tests were conducted for different values of the induction motor load torque and speed reference to validate the models.

Design/methodology/approach

To assess the thermal behavior and efficiency of the motor, electromagnetic and thermal models using a FEM software were developed. The coupling with the inverter drive is accomplished through a developed model in Matlab/Simulink which also includes the control system. The simulation tests were performed for a healthy and faulty inverter at different operating points of the three-phase induction motor. To validate the FEM models some experimental tests were performed.

Findings

When the inverter operates in reconfigured mode the motor losses are higher and consequently temperature is higher and the motor efficiency is lower. The developed models are an alternative to a more detailed study of the motor when fed by a 3LNPC inverter and consequent optimization of the control system.

Originality/value

With the developed tools, a better understanding of the motor behavior and performance is gained, allowing to forecast scenarios and optimize fault-tolerant control strategies for the drive.

Details

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 34 no. 2
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 30 December 2021

Nádia Cristina Pinheiro Rodrigues, Valéria Teresa Saraiva Lino, Leonardo Soares Bastos, Gisele O'Dwyer, Denise Leite Maia Monteiro, Inês Nascimento Carvalho Reis, Vera Cecília Frossard and Mônica Kramer Noronha Andrade

This study aims to improve our understanding of violence, focusing on the analysis of the relation between socioeconomic factors and homicide rates from 2005 to 2019 in Brazilian…

Abstract

Purpose

This study aims to improve our understanding of violence, focusing on the analysis of the relation between socioeconomic factors and homicide rates from 2005 to 2019 in Brazilian capitals.

Design/methodology/approach

Multilevel Poisson models were used to estimate the homicide risk in men and women. The response variable was the homicide rate. Fixed effects were estimated for age group, year and gross domestic product (GDP).

Findings

The average homicide rate over the 2005–2019 period was 5.83/100,000 and 83.72/100,000 for women and men, respectively. In both sexes, the homicide rates increased over the period. The highest mortality rates were observed in North and Northeastern capitals. The peak homicide rates were 2010–2014, the risk of homicide decreased as age increased, and the capitals with GDP lower than US$5,000 showed a greater homicide rate.

Originality/value

Brazil remains among the countries with the highest risk of homicide, especially in the north and northeast regions, where socioeconomic conditions are more unfavorable. The improvement of socioeconomic conditions may contribute to changing this situation.

Details

Journal of Aggression, Conflict and Peace Research, vol. 14 no. 3
Type: Research Article
ISSN: 1759-6599

Keywords

Article
Publication date: 12 September 2022

Sergio Díaz-González, Jesus M. Torres, Eduardo Parra-López and Rosa M. Aguilar

Smart tourist destinations (STDs) make use of new technologies to facilitate and improve the experience of tourists. So why not use these technologies to efficiently manage the…

Abstract

Purpose

Smart tourist destinations (STDs) make use of new technologies to facilitate and improve the experience of tourists. So why not use these technologies to efficiently manage the destination? The aim of this work is to define and implement a methodology that provides value to STDs by defining their most important characteristics to monitor and quantify them automatically in real time.

Design/methodology/approach

The authors developed a conceptual framework to the smart tourism approach presented in previous studies, the latest technologies and the application of the smart tourism system (STS). Based on the focus group method with stakeholders from the tourism industry of the Spanish tourist municipality of Puerto de la Cruz, they defined the main KPIs for a municipal STD. Likewise, the authors specified the necessary technologies to obtain, manage and represent the data, and the method for quantifying the quality of the STD by using the AHP method. Lastly, they implemented the framework for the aforementioned municipality.

Findings

The implementation in a real context of the STS proposed for Puerto de la Cruz demonstrates its validity and the possibility of adapting it to any other municipal destination. In addition, the authors corroborate how this STS improves on other versions.

Originality/value

This paper provides a theoretical methodology to improve STD management and implements it. Other studies have focused only on the theoretical aspect. Moreover, automated management tools are emerging for STDs, but they lack the quality provided by the scientific approach employed herein.

Article
Publication date: 29 June 2023

Mayara Regina Munaro and Sergio Fernando Tavares

Design for adaptability and disassembly (DfAD) is an effective method to reduce construction and demolition waste generation, landfill loads and greenhouse gas generation;…

Abstract

Purpose

Design for adaptability and disassembly (DfAD) is an effective method to reduce construction and demolition waste generation, landfill loads and greenhouse gas generation; preserve natural resources; and increase environmental awareness in the construction industry. However, it is an underexplored strategy due to a lack of information about projects and a set of agreed guidelines to guide buildings deconstruction. This study aims to understand how DfAD can support the sector’s transition toward circularity.

Design/methodology/approach

Through an integrative literature review, this study analyzed the current publications and terminologies used, identified the main themes discussed and described the key criteria for integrating deconstruction in the building design stage.

Findings

The results showed that the term DfAD encompasses different ecodesign strategies and is concentrated in six major thematic categories (design and construction principles, tools for DfAD, components and connections for DfAD, barriers, drivers and guidelines for DfAD, existing building stock potential and selective deconstruction process). In total, 60 criteria were presented to guide the deconstruction of buildings, emphasizing standardization, modularization and prefabrication of materials and components as fundamental requirements.

Originality/value

The study highlighted the need to expand the knowledge and training of the design team, establish public policies and tax incentives and develop tools, methods, and circular indicators to enable the implementation of deconstruction strategies for buildings.

Details

Construction Innovation , vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1471-4175

Keywords

Article
Publication date: 10 August 2018

Sergio Canavati

Empirical studies provide conflicting conclusions regarding the corporate social performance (CSP) of family firms. The purpose of this paper is to synthesize the existing…

1407

Abstract

Purpose

Empirical studies provide conflicting conclusions regarding the corporate social performance (CSP) of family firms. The purpose of this paper is to synthesize the existing empirical evidence and examine the potential role of research design and contextual factors.

Design/methodology/approach

A meta-analysis of existing empirical studies was performed to examine the role of sampling, measurement and contextual factors in explaining the different and often conflicting results of empirical studies in the family business literature.

Findings

The overall relationship between family firms and CSP is positive. The relationship between family firms and CSP is positive for private family firms but is negative for public family firms. The relationship between family firms and CSP is positive when family involvement includes both family ownership and management as opposed to only family ownership or family management. Private family firms care more and public family firms care less about the community, environment, and employees than private and public nonfamily firms. The relationship between family firms and CSP is stronger in institutional environments with weak labor and corporate governance regulatory frameworks.

Research limitations/implications

The operationalization of both the family firm and CSP constructs significantly predicts the magnitude and direction of the relationship between family firms and CSP.

Practical implications

Family firms should become more skilled at measuring and disseminating information about the firm’s CSP. Family firms should work to improve public perceptions about the CSP of family firms.

Social implications

Policy should encourage family firms to remain privately owned by the family. Policy should also incentivize the involvement of family owners in the management of family firms.

Originality/value

Although several literature reviews address the relationship between family firms and CSP, this is the first review to use the meta-analysis method. The authors contribute to the family business literature by analyzing how differences in study-, firm- and country-level factors can explain some of the variance in the results of the studies in the literature.

Details

Journal of Family Business Management, vol. 8 no. 3
Type: Research Article
ISSN: 2043-6238

Keywords

Article
Publication date: 24 March 2020

Aline Patricia Mano, Sergio E. Gouvea da Costa and Edson Pinheiro de Lima

The purpose of this study seeks to identify the critical barriers for the deployment of Lean Construction (LC).

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Abstract

Purpose

The purpose of this study seeks to identify the critical barriers for the deployment of Lean Construction (LC).

Design/methodology/approach

In order to identify the barriers of Lean Construction, a systematic review of the scientific literature was carried out, in addition to analysis of the content of papers presented at a major Lean Construction conference. After the barriers were identified, a Lawshe study was conducted with experts in Lean Construction to verify the criticality of each of the barriers encountered.

Findings

This study identified 83 potential pre-deployment barriers in the literature, of which eight were considered critical by the experts. The results of Lawshe study pointed that critical barriers refer to leadership characteristics, cultural aspects and structural aspects.

Research limitations/implications

Variations in the assessment of the criticality of the barriers may occur from one country to another due to regional differences in the construction sector.

Practical implications

The implications of this study are recognizing and identifying the characteristics of an organization that can hinder Lean Construction allows these issues to be resolved before beginning the Lean journey.

Originality/value

This article is the first of its kind to assess the criticality of barriers to Lean Construction using a quantitative technique. Knowledge of this set of barriers provides both practical and theoretical readers with an increased chance of success in the deployment of an LC project.

Details

International Journal of Productivity and Performance Management, vol. 70 no. 1
Type: Research Article
ISSN: 1741-0401

Keywords

Abstract

Details

The Emergence of Modern Hospital Management and Organisation in the World 1880s–1930s
Type: Book
ISBN: 978-1-78769-989-2

Article
Publication date: 13 May 2024

Sergio Jesus Teixeira, Joao Matos Ferreira and António Almeida

The purpose of this study involves analysing the factors of and barriers to innovation and their respective impacts (directly and indirectly) on the competitiveness of both…

Abstract

Purpose

The purpose of this study involves analysing the factors of and barriers to innovation and their respective impacts (directly and indirectly) on the competitiveness of both destination and their host companies.

Design/methodology/approach

Based on primary data collected by questionnaire from a sample of 119 companies operating in the tourism sector in the autonomous region of Madeira (Portugal), the authors applied a quantitative methodology with recourse to econometric models and multiple linear regression.

Findings

Comprehensive results based on a conceptual model are obtained through the analysis of competitiveness tourism-based and innovation factors. The study identifies and empirically tests the existing and underlying relationships between innovation (factors and barriers) as the means of leveraging the competitiveness of destinations and their companies.

Originality/value

The results hold important theoretical and practical implications contributing towards innovation for competitiveness and filling a shortcoming identified in the literature.

Book part
Publication date: 28 November 2022

Sergio Schneider and Abel Cassol

Territorial food markets and governance have emerged as a key mechanism for the design and implementation new food systems and policies aimed at sustainable cities. However, the…

Abstract

Territorial food markets and governance have emerged as a key mechanism for the design and implementation new food systems and policies aimed at sustainable cities. However, the many existing policies tend to overlook the way food markets and supply strategies work. This chapter analyses governance in traditional agri-food markets in Brazil, aiming to demonstrate how, in different contexts, the economic interactions between actors are embedded in a set of social institutions (cultural values), which define modes of governance, participation in the markets and can be potential to fostering new (sustainable) rural-urban relations. These institutions challenge and compete with formal regulatory requirements imposed by the public authorities, which often disrupt and/or inhibit the development of local and traditional production and consumption practices, posing obstacles to the fostering rural-urban relations and the construction of solid local policies for food supply. Empirical data refer to three traditional Brazilian markets: the Feira do Pequeno Produtor in Passo Fundo, located in the South of Brazil, the Feira Central de Campina Grande and the Feira de Caruaru, both located in the Northeast of the country. The results point to the necessity and centrality to cities food supply policies recognise, encourage and institutionalise these markets traditional institutions in order to overcome supermarketisation and consolidate sustainable food systems. These process could be able to remove traditional markets from marginalise, promoting not only their survival, but their growth and consolidation as a source of decent work, healthy food and new sustainable rural-urban relationships.

Details

Food and Agriculture in Urbanized Societies
Type: Book
ISBN: 978-1-80117-770-2

Keywords

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