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Article
Publication date: 29 May 2009

Rodrigo Rossi, Marcelo Krajnc Alves and Hazim Ali Al‐Qureshi

The purpose of this paper is to investigate the application of the element‐free Galerkin (EFG) method to the simulation of metal forming processes and to propose a…

Abstract

Purpose

The purpose of this paper is to investigate the application of the element‐free Galerkin (EFG) method to the simulation of metal forming processes and to propose a strategy to deal with volumetric locking problem in this context.

Design/methodology/approach

The J2 elastoplastic material model, employed in the work, assumes a multiplicative decomposition of the deformation gradient into an elastic and a plastic part and incorporates a non‐linear isotropic hardening response. The constitutive model is written in terms of the rotated Kirchhoff stress and the logarithmic strain measure. A Total Lagrangian formulation of the problem is considered in order to improve the computational performance of the proposed algorithm. The imposition of the essential boundary conditions and also of the unilateral contact with friction condition are made by the application of the Augmented Lagrangian method. Here, aspects related to the volumetric locking are investigated and an F‐bar approach is applied.

Findings

The results show that the proposed approach presents no volumetric locking phenomenon when using the mean dilation approach. Moreover, differently from finite element approximations, no hour‐glass instabilities in the deformation pattern are observed, avoiding in this way the need to devise additional stabilization procedures in the proposed procedure.

Originality/value

This paper demonstrates the implementation and validation of the mean dilation approach, in the scope of the EFG, which was successful in coping with the volumetric locking phenomena and presented no hour‐glass instabilities in the problem cases considered in this work.

Details

Engineering Computations, vol. 26 no. 4
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 5 October 2012

Oscar A.G. de Suarez, Rodrigo Rossi and Cláudio R.A. da Silva

The purpose of this paper is to investigate the approximation performance of a family of piecewise rational polynomial shape functions, which are enriched by a set of…

Abstract

Purpose

The purpose of this paper is to investigate the approximation performance of a family of piecewise rational polynomial shape functions, which are enriched by a set of monomials of order p to obtain high order approximations. To numerically demonstrate the features of the enriched approximation some examples on the mechanical elastic response and free‐vibration of axisymmetric plates and shells are carried out.

Design/methodology/approach

The global approximation is based on a particular family of weight function, which is defined on the parametric domain of the element, ξ∈[−1,1], resulting in shape functions with compact support, which have regularity C0k,k=0,2,4… in the global domain Σ. The PU shape functions are enriched by a set of monomials of order p to obtain high order approximation spaces.

Findings

Based on the numerical results of elastic axisymmetric plates and shells, it is demonstrated that the proposed methodology produces satisfactory results in terms of keeping the ill‐conditioning of the system of equations under accepted levels. Comparisons are established between linear and Hermitian shape functions showing similar results. The observed results for the free‐vibration problem of plates and shells show the potential of the proposed approximation space.

Research limitations/implications

In this paper the formulation is limited to the modeling of axisymmetric plate and shell problems. However, it can be applied to model other problems where the high regularity of the approximation is required.

Originality/value

The paper presents an alternative approach to construct partition of unity shape functions based on a particular family of weight function.

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Article
Publication date: 14 June 2021

Alicia Rosales, M. Inmaculada Talaverano, Jesús Lozano, Carlos Sánchez-Vicente, Óscar Santamaría, Carlos García-Latorre and Sara Rodrigo

The aim of this paper is to determine chemical and sensory differences of between craft and industrial/or commercial beers. Beer market is nowadays booming and consumers…

Abstract

Purpose

The aim of this paper is to determine chemical and sensory differences of between craft and industrial/or commercial beers. Beer market is nowadays booming and consumers are in the search of new and healthier products.

Design/smethodology/approach

Here, commercial and craft beers were chemically analyzed and sensory evaluated. Chemical analysis included pH, bitterness, color, total polyphenol content and antioxidant activity. Likewise, 40 sensory descriptors were evaluated by trained panelists, including visual, olfactory and gustatory attributes. In addition, an electronic nose (e-nose) was tested to determine its suitability to discriminate beer type and/or style according to their volatiles profile.

Findings

Craft beers presented higher values of color, bitterness and antioxidant activity when compared to commercial beers. Sensory descriptors showed craft beers to be associated with the highest scores in visual, olfactory and gustatory descriptors. Data from e-nose explained 97% of the total variability of the volatile compounds in the analyzed beers, indicating the suitability of this device to discriminate beer types.

Originality/value

Results are of interest for design of marketing and selling techniques for craft brewery managers. In addition, cheap and easy-managing device as e-nose resulted in a valuable tool to monitoring beer quality.

Details

British Food Journal, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0007-070X

Keywords

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Expert briefing
Publication date: 11 October 2017

On the agenda is the issue of legislation on open-pit mining and the stopping of the export of unprocessed ores. This follows Cimatu’s confirmation in post by the…

Details

DOI: 10.1108/OXAN-DB225034

ISSN: 2633-304X

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Geographic
Topical
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Book part
Publication date: 3 September 2014

Rodrigo de Souza Gonçalves, Otávio Ribeiro de Medeiros, Elionor Farah Jreige Weffort and Jorge Katsumi Niyama

This study is aimed at developing and validating an index designed to measure the level of social disclosure of external social programs of firms listed on the Brazilian…

Abstract

Purpose

This study is aimed at developing and validating an index designed to measure the level of social disclosure of external social programs of firms listed on the Brazilian stock market.

Methodology/Approach

The index of social disclosure is composed of 13 items distributed in three dimensions: past information, prospective actions, and accessibility. Its validation involved: (a) pre-test, (b) analysis by referees, (c) exploratory factor analysis, (d) Cronbach’s alpha test, and (e) final validation. The sample is composed of 83 Brazilian firms listed on the Brazilian Stock Exchange from 2005 to 2009.

Findings

The index presented robustness in all validation stages. It was found that size, industry sector, internationalization, auditing, and listing on social responsible investment funds are decisive factors for increasing the level of social disclosure.

Research Limitations

The index of social disclosure evaluates external social programs only. Hence, some types of social information are not captured, such environmental ones. Besides, the sources of information for the index are restricted to annual and sustainability reports, so that information from other sources, such as official announcements and company websites, are not captured.

Social Implications

The social disclosure index developed can be useful to analysts and investors assessing listed firms, as well as to financial-market regulators defining policies applicable to the disclosure of corporate social information.

Originality/Value

(a) Construction of a social disclosure index validated and tested in Brazilian firms, which is liable to replication; (b) Utilization of a representative sample of firms listed on an important emerging stock market.

Content available
Article
Publication date: 30 December 2020

Patrice De Micco, Loredana Rinaldi, Gianluca Vitale, Sebastiano Cupertino and Maria Pia Maraghini

The purpose of this paper is to investigate the challenges that companies could face over time when dealing with sustainability reporting (SR) and focusses on potential…

Abstract

Purpose

The purpose of this paper is to investigate the challenges that companies could face over time when dealing with sustainability reporting (SR) and focusses on potential mechanisms they may adopt to cope with them.

Design/methodology/approach

The investigation is conducted adopting the theoretical framework proposed by Baret and Helfrich (2018) and using a longitudinal case study.

Findings

The authors found that the challenges that gradually arose induced the evolution of SR. Dissemination, employees’ involvement, managerial commitment and routinization/institutionalization of reporting practices appeared to be useful mechanisms to face the related challenges. Conversely, the authors found that stakeholders’ engagement scarcely affected SR. Furthermore, the legislation impacted the extent and quality of disclosed contents and fostered the standardization of the reporting process.

Practical implications

In analysing how Estra faced SR challenges, this paper emphasizes the mechanisms that can be used to properly manage them, in a gradual and holistic way. Hence, this study offers a useful example for companies approaching SR for the first time.

Originality/value

The authors adopt a holistic theoretical perspective providing evidence on how SR development within a company depends on the continuous and integrated management of its multiple challenges, also suggesting that its interdependencies with the definition and execution of sustainability should be exploited.

Details

Meditari Accountancy Research, vol. 29 no. 3
Type: Research Article
ISSN: 2049-372X

Keywords

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Book part
Publication date: 30 November 2020

Paula Brügger

From an interdisciplinary position, I discuss the historical and epistemological roots of the objectification and commodification of nature, which emerged from the…

Abstract

From an interdisciplinary position, I discuss the historical and epistemological roots of the objectification and commodification of nature, which emerged from the hegemony of instrumental rationality. This rationality—synthetically, a technological, political, social, ethical, and esthetical universe of thought and action—has created both wealth and environmental destruction due to the progressive domination of nature through science and technology. The objectification of nature and nonhuman animals is associated with the legacy of René Descartes based on some excerpts of his famous Discourse on the Method in which the idea of animals as machines established a powerful and pervasive metaphor that remains today. Speciesism, which involves forms of discrimination practiced by humans against other animal species, also dominates Western perspectives. However, studies reveal that nonhuman animal sentience and conscience is a scientific fact. While there is no ethical or scientific ground to support speciesism, the colossal number of animals commodified in a myriad of contexts, especially in animal agriculture, proves that our society is very far from overcoming this issue. A possible path to change is education. Nevertheless, profound transformations are mandatory as formal education—even “environmental education”—carries in its philosophical foundations the Cartesian, instrumental paradigm that favors the objectification and commodification of nature. I present how the concept of instrumental rationality, especially as proposed by Herbert Marcuse, establishes as a unifying and solid ground to address the roots of the objectification and commodification of nature (including nonhuman animals), as well as to confront the epistemological bedrock of our speciesist nonenvironmental, traditional education.

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Article
Publication date: 17 September 2019

Maximiliano Gonzalez, Juan David Idrobo and Rodrigo Taborda

The purpose of this paper is to carry out a meta-regression analysis upon the literature that examines the relationship between family firms and financial performance.

Abstract

Purpose

The purpose of this paper is to carry out a meta-regression analysis upon the literature that examines the relationship between family firms and financial performance.

Design/Methodology/Approach

Information of publication and study characteristics from 61 primary studies, comprising 726 size effects was collected. In particular, three leading factors highlighted in narrative literature reviews analyzed were: the financial performance measures, the family–firm definitions and the estimation methodologies.

Findings

Overall, a positive relationship between family involvement and financial performance was found. A series of results, those linked to return on assets (ROA) – earnings before interest, taxes, depreciation and amortization (EBITDA), suggest positive publication bias from family definition and negative publication bias when OLS is used. Tobin’s Q estimates show no linkage to certain traits and aspects of the research process.

Originality/value

Existing literature review and meta-analysis studies show not concluding results on the family effect upon firm performance. The meta-regression analysis used in this paper allows to examine simultaneously effect size and publication bias. The latter effect is particularly salient in the approach and findings, and not present in previous studies.

Propósito

Llevar a cabo un análisis de meta-regresión a la literatura que examina la relación entre firmas familiares y desempeño financiero.

Diseño/metodología/aproximación

Se usa la información de la publicación y características del estudio de 61 estudios primarios, que incluyen 726 estimaciones. Se examinan tres elementos principales de esta literatura: (i) medidas de desempeño financiero, (ii) definición de firma familiar, y (iii) metodología de estimación.

Resultados

Se establece una relación positiva entre involucramiento familiar y desempeño financiero. Las estimaciones que examinan ROA-EBITDA sugieren sesgo positivo de publicación. Las estimaciones que utilizan estimación de Mínimos Cuadrados Ordinarios sugieren un sesgo negativo de publicación. Las estimaciones que examinan la Q de Tobin, no sugieren relación con las características de los estudios o de la investigación.

Originalidad/valor

Los estudios de meta-análisis existentes sobre esta literatura no ofrecen resultados concluyentes del efecto de las firmas familiares y desempeño financiero. El método de meta-regresión permite examinar simultáneamente el efecto entre las variables y la posible existencia de sesgo de publicación. La indagación de este último es de particular interés y no se encuentra en otros estudios.

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Article
Publication date: 1 August 2001

María Buenadicha Mateos, Antonio Chamorro Mera, Francisco Javier Miranda González and Óscar Rodrigo González López

Despite the rapid growth of the World Wide Web in the last several years few studies have appeared in the literature assessing Web sites’ efficacy. This paper provides an…

Abstract

Despite the rapid growth of the World Wide Web in the last several years few studies have appeared in the literature assessing Web sites’ efficacy. This paper provides an original Web Assessment Index, focused on four categories: accessibility, speed, navigability and content. The scoring mechanism is explained and the index is applied to assess the Web sites of all Spanish universities. Finally, conclusions and implications derived from this study are presented.

Details

Internet Research, vol. 11 no. 3
Type: Research Article
ISSN: 1066-2243

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Article
Publication date: 20 June 2008

E. Reinaerts, J. De Nooijer and N.K. De Vries

The purpose of this paper is to show how the intervention mapping (IM) protocol could be applied to the development of two school‐based interventions. It provides an…

Abstract

Purpose

The purpose of this paper is to show how the intervention mapping (IM) protocol could be applied to the development of two school‐based interventions. It provides an extensive description of the development, implementation and evaluation of two interventions which aimed to increase fruit and vegetable (F&V) consumption among primary school children.

Design/methodology/approach

The paper describes how information drawn from relevant literature and theory, as well as additional data collected from primary school children, their parents and teachers, were applied to the development, implementation and evaluation of the interventions. The IM protocol consists of five steps: defining proximal program objectives; applying methods and strategies for behavioural change; creating a program plan; preparing program implementation; and evaluation. An extensive assessment of the perceived health problem was conducted prior to beginning step 1 of IM.

Findings

Application of the protocol resulted in two school‐based interventions aimed at making F&V consumption habitual: a free F&V distribution program; and a multi‐component, age‐specific program consisting of a classroom curriculum and parental involvement.

Practical implications

The matrices presented can provide health educators with a foundation for the development of future dietary interventions for children.

Originality/value

By providing a detailed description of the application of the IM, it was shown that the protocol can be used as a practical aid for the development of planned health promotion interventions. It proved to be an effective means for making well‐considered choices in every step of program development and implementation.

Details

Health Education, vol. 108 no. 4
Type: Research Article
ISSN: 0965-4283

Keywords

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