Search results

1 – 10 of 266
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 1 January 2006

Mohammad B. Ayani, Javad A. Esfahani and Antonio C.M. Sousa

To show the effect of radiation from the heat source and the variation of fluid properties on the laminar natural convection induced by a line heat source.

443

Abstract

Purpose

To show the effect of radiation from the heat source and the variation of fluid properties on the laminar natural convection induced by a line heat source.

Design/methodology/approach

The governing equations – Navier‐Stokes and energy equation are discretized in a staggered grid by a control volume approach, and they are solved using a segregated technique. The equations for the fluid and solid (line heat source) phases are solved simultaneously. The three sides of the computational domain are open boundary. Some of the physical and thermo‐physical properties of the fluid (air) such as density, thermal conductivity and viscosity were considered to vary with temperature.

Findings

The present predictions are compared with those using the Boussinesq approximation, with the results for the boundary layer equations, and with the experimental results. The present predictions reveal considerable departure from the Boussinesq‐based solution and from the boundary layer results. This study also shows the radiation exchange between the heat source and surrounding has major effect in the results. Thus, the departure between the experimental and analytical results can be explained by the effect of radiation exchange.

Research limitations/implications

In this work, just studied steady‐state laminar thermal plume with the effects of radiation from heat source and the variation of air properties with temperature while it is propose to extend this work to transient and/or turbulent flow.

Originality/value

The effect of radiation from a line heat source on the flow filed around the source and offers enhancement of design to thermal engineers.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 16 no. 1
Type: Research Article
ISSN: 0961-5539

Keywords

Access Restricted. View access options
Book part
Publication date: 23 March 2017

Barbara de Lima Voss, David Bernard Carter and Bruno Meirelles Salotti

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…

Abstract

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.

Details

Advances in Environmental Accounting & Management: Social and Environmental Accounting in Brazil
Type: Book
ISBN: 978-1-78635-376-4

Keywords

Available. Open Access. Open Access
Article
Publication date: 13 June 2018

Michele Machado, Marcos Sousa, Vicente Rocha and Antonio Isidro

The purpose of this study is to identify innovation models in the judiciary according to the current integrated theoretical approach for innovation in services.

3588

Abstract

Purpose

The purpose of this study is to identify innovation models in the judiciary according to the current integrated theoretical approach for innovation in services.

Design/methodology/approach

This study uses a quantitative approach. The authors collected the data through a questionnaire sent to labor court public servants and judges in a Regional Labor Court in the Midwestern region of Brazil. They performed a principal component analysis to identify the factors to map the innovation models present in the court.

Findings

Two factors were obtained from the results, which describe innovations in processes and services in the court studied. In terms of the examples of innovations cited by the respondents, one may note that those related to information and communications technology are the most remembered, especially the introduction of the electronic lawsuit.

Originality/value

The results can contribute toward a deeper understanding of which vectors of service innovation are affected as well as the nature of the court’s underlying structure. Also, the research instrument used allows the identification and analysis of the innovation model for services and thus contributes to its validation.

Details

Innovation & Management Review, vol. 15 no. 2
Type: Research Article
ISSN: 2515-8961

Keywords

Access Restricted. View access options
Article
Publication date: 26 July 2021

Nicole Gomes Dias, Beltran Nadal Arribas, Paulo Gordo, Tiago Sousa, João Marinho, Rui Melicio, António Amorim and Patrick Michel

This paper aims to report the first iteration on the Light Detection and Ranging (LIDAR) Engineering Model altimeter named HELENA. HELENA is a Time of Flight (TOF) altimeter that…

149

Abstract

Purpose

This paper aims to report the first iteration on the Light Detection and Ranging (LIDAR) Engineering Model altimeter named HELENA. HELENA is a Time of Flight (TOF) altimeter that provides time-tagged distances and velocity measurements. The LIDAR can be used for support near asteroid navigation and provides scientific information. The HELENA design comprises two types of technologies: a microchip laser and low noise sensor. The synergies between these two technologies enable developing a compact instrument for range measurements of up to 14 km. Thermal-mechanical and radiometric simulations of the HELENA telescope are reported in this paper. The design is subjected to vibrational, static and thermal conditions, and it was possible to conclude by the results that the telescope is compliant with the random vibration levels, the static load and the operating temperatures.

Design/methodology/approach

The Asteroid Impact & Deflection Assessment (AIDA) is a collaboration between the NASA DART mission and ESA Hera mission. The aim scope is to study the asteroid deflection through a kinetic collision. DART spacecraft will collide with Didymos-B, while ground stations monitor the orbit change. HERA spacecraft will study the post-impact scenario. The HERA spacecraft is composed by a main spacecraft and two small CubeSats. HERA will monitor the asteroid through cameras, radar, satellite-to-satellite doppler tracking, LIDAR, seismometry and gravimetry.

Findings

The HELENA design comprises two types of technologies: a microchip laser and low noise sensor. The synergies between these two technologies enable developing a compact instrument for range measurements of up to 14 km.

Originality/value

In this paper is reported the first iteration on the LIDAR Engineering Model altimeter named HELENA. HELENA is a TOF altimeter that provides time-tagged distances and velocity measurements. The LIDAR can be used for support near asteroid navigation and provides scientific information. The HELENA design comprises two types of technologies: a microchip laser and low noise sensor. The synergies between these two technologies enable developing a compact instrument for range measurements of up to 14 km.

Details

Aircraft Engineering and Aerospace Technology, vol. 93 no. 6
Type: Research Article
ISSN: 1748-8842

Keywords

Access Restricted. View access options
Article
Publication date: 11 May 2021

Saymon Ricardo de Oliveira Sousa, Cristiane Melchior, Wesley Vieira Da Silva, Roselaine Ruviaro Zanini, Zhaohui Su and Claudimar Pereira da Veiga

This study aims to (1) investigate the association between companies' investment in occupational safety and their financial performance and (2) discuss the importance of…

383

Abstract

Purpose

This study aims to (1) investigate the association between companies' investment in occupational safety and their financial performance and (2) discuss the importance of occupational safety to overall performance.

Design/methodology/approach

Occupational safety is often considered to be a practice that can yield suboptimal return on investment. However, it is not known whether this belief is substantiated by evidence. A mapping review of the eligible research literature (N = 36) regarding firms' investment in occupational safety and their financial performance, published between 1945 and2018, was carried out in the Web of Science database.

Findings

By dispelling myths regarding return on investment associated with occupational safety, the findings of this study underscore financial gains firms can obtain by promoting occupational safety measures in their organizations.

Originality/value

These issues are important because they can help policymakers understand the pressures companies face in terms of occupational safety and financial performance sustainability.

Details

International Journal of Workplace Health Management, vol. 14 no. 3
Type: Research Article
ISSN: 1753-8351

Keywords

Access Restricted. View access options
Article
Publication date: 11 November 2019

Daiane Costa dos Santos, Josemar Gonçalves de Oliveira Filho, Jhessika de Santana Silva, Milena Figueiredo de Sousa, Marcio da Silva Vilela, Marco Antonio Pereira da Silva, Ailton Cesar Lemes and Mariana Buranelo Egea

Okara, which is the residue of hydrosoluble extract from soybean obtained after soymilk and tofu production, has high nutritional value and can be used for ingredient in specific…

955

Abstract

Purpose

Okara, which is the residue of hydrosoluble extract from soybean obtained after soymilk and tofu production, has high nutritional value and can be used for ingredient in specific food products. This study aims to evaluate the production and properties (physicochemical, microscopical and functional ones) of okara flour (OF) obtained from okara as a by-product of soymilk and tofu production.

Design/methodology/approach

Wet okara resulted from the soymilk process underwent convective drying up to reach mass stability (60°C for 12 h). OF properties were analyzed by official methods by AOAC, i.e. mineral composition was evaluated by atomic absorption equipment; color; water absorption index (WAI); milk absorption index (MAI); oil absorption capacity (OAC); and foam capacity (FC) required mixtures with water, milk and oil, separation and gravimetry, respectively; and microstructure was determined by a scanning electron microscope.

Findings

Results showed the potential OF has as a source of protein (24.74 g/100 g) and dietary fiber (58.27 g/100 g). Regarding its color after the drying process, OF was markedly yellow (b* parameter 20.16). Its WAI was 3.62 g/g, MAI was 4.33 g/g, OAC was 3.68 g/g and FC was 1.32 per cent. The microscopic analysis of OF showed that both loose and agglomerated particles had irregular structures and indefinite forms.

Originality/value

Production of flour from wet okara can be an alternative use of this by-product. This study showed important characteristics of OF and its possible application to the food industry. Thus, OF was shown as a potential ingredient with high nutritional value.

Details

Nutrition & Food Science , vol. 49 no. 6
Type: Research Article
ISSN: 0034-6659

Keywords

Access Restricted. View access options
Article
Publication date: 1 September 2004

M. Poursina, C.A.C. António, C.F. Castro, J. Parvizian and L.C. Sousa

A numerical method for shape optimisation in forging is presented. The goal of the optimisation is to eliminate work‐piece defects that may arise during the forging process. A…

600

Abstract

A numerical method for shape optimisation in forging is presented. The goal of the optimisation is to eliminate work‐piece defects that may arise during the forging process. A two‐dimensional finite element code has been developed for the simulation of the mechanical process. The material is incompressible and it follows the Norton‐Hoff law. To deal with contact constraint the velocity projection algorithm is used. The optimisation process is conducted using a genetic algorithm supported by an elitist strategy. A new genetic operator called adaptive mutation has been developed to increase the efficiency of the search. The developed scheme is used to design optimal preform shapes for several axisymmetric examples. Continuous and discrete design variables are considered. The objective function of the optimisation problem is associated with the quality of the final product. Comparing the obtained optimal results with the literature validates the proposed optimisation method.

Details

Engineering Computations, vol. 21 no. 6
Type: Research Article
ISSN: 0264-4401

Keywords

Access Restricted. View access options
Article
Publication date: 3 October 2016

Antônio Márcio Tavares Thomé and Rui Sousa

The purpose of this paper is to propose that the effectiveness of organizational design-manufacturing integration (ODMI) practices is contingent upon the degree of complexity of…

1482

Abstract

Purpose

The purpose of this paper is to propose that the effectiveness of organizational design-manufacturing integration (ODMI) practices is contingent upon the degree of complexity of the manufacturing environment. The paper submits that the level of use of ODMI ought to match the level of complexity of the manufacturing environment. The paper puts forward the hypothesis that when a misfit occurs between ODMI and complexity (high use of ODMI practices in low complexity environments or low use of ODMI practices in high complexity environments) manufacturing operational performance declines.

Design/methodology/approach

The paper tests the hypothesis based on a survey database of 725 manufacturers from 21 countries. The measurement model was assessed with confirmatory factor analysis and the hypothesis was tested with linear regression.

Findings

A misfit between the level of ODMI use (job rotation and co-location) and manufacturing complexity (product and process complexity) has a negative effect on manufacturing operational performance dimensions of quality, delivery and flexibility. Post hoc analyses also suggest that firms that operate in different environments in what concerns the rate of change in process technologies suffer differentiated negative impacts of ODMI-complexity misfit.

Research limitations/implications

Future studies could extend this research to other dimensions of design-manufacturing integration, such as technological practices.

Practical implications

Manufacturers with high levels of complexity should invest strongly in ODMI practices. However, manufacturers with low levels of complexity should invest in these practices with caution since the expected payoffs may not outweigh the effort.

Originality/value

The study assesses fit as a simultaneous set of contingency factors, applying profile-deviation analysis to ODMI and operational performance relationships. By focusing on plant-level manufacturing complexity, this study complements existing studies of product development complexity which tend to focus on project-level complexity.

Details

International Journal of Operations & Production Management, vol. 36 no. 10
Type: Research Article
ISSN: 0144-3577

Keywords

Access Restricted. View access options
Article
Publication date: 10 October 2018

Marco Antonio Paula Pinheiro, Bruno Michel Roman Pais Seles, Paula De Camargo Fiorini, Daniel Jugend, Ana Beatriz Lopes de Sousa Jabbour, Hermes Moretti Ribeiro da Silva and Hengky Latan

The purpose of this paper is to identify and systematize journal articles that relate to new product development (NPD) within a circular economy (CE) and to present an integrative…

2934

Abstract

Purpose

The purpose of this paper is to identify and systematize journal articles that relate to new product development (NPD) within a circular economy (CE) and to present an integrative framework.

Design/methodology/approach

It was conducted a qualitative research based on a systematic review of the literature.

Findings

As results, it is presented the identification of the main practices and actions of CE applied to NPD, as well as the drivers, barriers and the stakeholders involved in the integration between CE and NPD.

Originality/value

The main contributions of this research are: mapping the state-of-the-art on the topic and systematizing the existing knowledge; providing useful insights for product development professionals considering adopting CE practices and tools in their NPD processes; and presenting a unique, integrative framework to guide organizations’ actions.

Details

Management Decision, vol. 57 no. 4
Type: Research Article
ISSN: 0025-1747

Keywords

Access Restricted. View access options
Article
Publication date: 10 April 2017

Jorge Casas Novas, Maria do Céu Gaspar Alves and António Sousa

The purpose of this paper is to examine the role of management accounting systems (MAS) in the development of intellectual capital (IC) – i.e. human capital (HC), structural…

2197

Abstract

Purpose

The purpose of this paper is to examine the role of management accounting systems (MAS) in the development of intellectual capital (IC) – i.e. human capital (HC), structural capital (SC) and relational capital (RC) – and the resultant effects on organizational performance.

Design/methodology/approach

A questionnaire was developed to conduct a survey of high-level managers of Portuguese companies. The data collected were analyzed through the use of structural equation modeling with AMOS.

Findings

Statistical support was found for six out of nine hypothesized relationships. The findings confirm the role of MAS in the development of HC and SC. Results also showed positive and statistically significant relationships between the three dimensions of IC, in line with previous research. Finally, results indicated that SC has a positive and significant link with organizational performance, in keeping with some research.

Research limitations/implications

The estimation procedure allowed only a partial validation of the proposed model because, although positive, the relationships between MAS and RC, between HC and performance and between RC and organizational performance were not statistically significant.

Practical implications

The study highlights the role of MAS as information networks that collect, process and communicate information that influences the development of IC, as well as networks of relationships that support the establishment of conditions for the creation and integration of organizational knowledge and the development of IC.

Originality/value

In this research, an arguably more complete framework of the relations between MAS, IC and performance is developed and empirically tested. Despite the existence of some literature addressing the relationship between MAS and IC, this is the first study, of which authors are aware, that focuses specifically on the relationships between MAS and the three dimensions of IC (HC, SC and RC), as well as their effects on organizational performance.

Details

Journal of Intellectual Capital, vol. 18 no. 2
Type: Research Article
ISSN: 1469-1930

Keywords

1 – 10 of 266
Per page
102050