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Article
Publication date: 4 September 2017

Eddisson Francisco Hernández, Prisciliano Felipe de Jesus Cano-Barrita, Frank Manuel León-Martínez and Andres Antonio Torres-Acosta

This paper aims to present experimental results related to the performance of cactus mucilage (CM) and brown seaweed extracts (SEs) to inhibit reinforcing steel bar…

Abstract

Purpose

This paper aims to present experimental results related to the performance of cactus mucilage (CM) and brown seaweed extracts (SEs) to inhibit reinforcing steel bar (rebar) corrosion in saturated calcium hydroxide alkaline solutions (pH = 12.5).

Design/methodology/approach

Electrochemical cells were prepared using CM solutions at 0.5, 1 and 1.38 per cent concentration (w/v), SE solutions at 0.5, 1, 1.38, 2 and 3 per cent concentration (w/v), sodium alginate at 1 per cent concentration (w/v) and calcium nitrite at 11.3 per cent (v/v). Each cell contained six deformed reinforcing steel bars of 9.5 mm nominal diameter. The experiments were performed at 23 ± 2°C in two stages. The first stage was aimed at stabilizing the rebar until passivation was reached. The second stage included adding NaCl in six steps from 0.5 to 16 g/L. Half-cell potential, linear polarization resistance and electrochemical impedance spectroscopy measurements were monitored during both stages.

Findings

The electrochemical test results indicated that both additions reduce the corrosion rate of rebars and pitting in an alkaline media with chloride ions (16 g/L NaCl). Electrochemical impedance spectroscopy results for rebars in natural-added solutions showed higher charge transfer resistance and double layer capacitance values, indicative of the formation of a second interface between the rebar and the electrolyte.

Research limitations/implications

The information obtained was for alkaline solutions only. Further investigation is performed using concrete as the alkaline electrolyte.

Practical implications

CM and SE may be suitable low-cost corrosion inhibitors for steel in concrete.

Social implications

The use of botanical or algae products for this application will encourage people to consider its production for this particular application. Also, the possible harvest in an environmental friendly way will diminish in the future the use of biohazards and toxic inhibitors.

Originality/value

This investigation is a continuation of a one presented in 2007, which uses only nopal mucilage. This new investigation corroborates what was concluded in the early investigation and incorporates a new natural by product, algae, as a possible corrosion inhibitor product.

Details

Anti-Corrosion Methods and Materials, vol. 64 no. 5
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 15 August 2019

Isaac Ferreira, Margarida Machado, Fernando Alves and António Torres Marques

In industry, fused filament fabrication (FFF) offers flexibility and agility by promoting a reduction in costs and in the lead-time (i.e. time-to-market). Nevertheless…

Abstract

Purpose

In industry, fused filament fabrication (FFF) offers flexibility and agility by promoting a reduction in costs and in the lead-time (i.e. time-to-market). Nevertheless, FFF parts exhibit some limitations such as lack of accuracy and/or lower mechanical performance. As a result, some alternatives have been developed to overcome some of these restrictions, namely, the formulation of high performance polymers, the creation of fibre-reinforced materials by FFF process and/or the design of new FFF-based technologies for printing composite materials. This work aims to analyze these technologies.

Design/methodology/approach

This work aims to study and understand the advances in the behaviour of 3D printed parts with enhanced performance by its reinforcement with several shapes and types of fibres from nanoparticles to continuous fibre roving. Thus, a comprehensive survey of significant research studies carried out regarding FFF of fibre-reinforced thermoplastics is provided, giving emphasis to the most relevant and innovative developments or adaptations undergone at hardware level and/or on the production process of the feedstock.

Findings

It is shown that the different types of reinforcement present different challenges for the printing process with different outcomes in the part performance.

Originality/value

This review is focused on joining the most important researches dedicated to the process of FFF-printed parts with different types reinforcing materials. By dividing the reinforcements in categories by shape/geometry and method of processing, it is possible to better quantify performance improvements.

Details

Rapid Prototyping Journal, vol. 25 no. 6
Type: Research Article
ISSN: 1355-2546

Keywords

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Article
Publication date: 10 July 2009

Víctor Reyes‐Alcázar, Belén Sotillos‐González and Antonio Torres‐Olivera

The purpose of this paper is to develop and describe the symbolic value of quality awards as a key indicator of recognition that public organizations have reached in the…

Abstract

Purpose

The purpose of this paper is to develop and describe the symbolic value of quality awards as a key indicator of recognition that public organizations have reached in the scope of quality management and continuous improvement.

Design/methodology/approach

The paper provides a description of the evolution of the three series of healthcare quality awards that have been held to‐date in one of the biggest regions of Europe: Andalusia.

Findings

Theoretical analysis of an instrument conceived as an institutionalised way of recognizing quality assurance initiatives in the Andalusian Public Health System. At the same time, the article focuses on the importance of using a reference model to ensure that the process of assessing the projects is systematic and rigorous and therefore stands as a guarantee of transparency within a public administration.

Research limitations/implications

The ultimate outcome is dependent of the geographical context and the behaviours and perceptions of people that have participated as assessment panels.

Practical implications

The conceptual framework provides guidance on what methodology is used to assess the quality projects (process to allocate projects to assessment panels and assessment criteria required) in a complex healthcare system. It serves as a managerial framework to enhance the continuous improvement in all health‐related services.

Originality/value

The paper contributes to create a structured debate between researchers and healthcare leaders regarding the assessment criteria to evaluate healthcare quality projects.

Details

Leadership & Organization Development Journal, vol. 30 no. 5
Type: Research Article
ISSN: 0143-7739

Keywords

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Article
Publication date: 4 October 2011

Víctor Reyes‐Alcázar, Belén Sotillos‐González, Jose A. Valverde and Antonio Torres‐Olivera

This paper aims to describe the participation of health professionals as key agents for the successful definition of skills manuals supporting professional accreditation…

Abstract

Purpose

This paper aims to describe the participation of health professionals as key agents for the successful definition of skills manuals supporting professional accreditation in Andalusia (Spain).

Design/methodology/approach

The increasing extent to which different stakeholders are recognized reflects the importance they hold in all decision‐making processes. The Andalusian Agency for Healthcare Quality's commitment to this process has facilitated the healthcare professionals' participation when professional skills manuals are designed for their respective specialities.

Findings

The process involved over 400 healthcare professionals from 58 disciplines between March 2005 and January 2008. Results were conditioned by several factors, some acting as drivers while others represented a barrier.

Research limitations/implications

The experience relates to a specific geographical context. Healthcare professionals eligible to participate had to be in active employment and working for the Andalusian Public Health Service. There was an overrepresentation of members from scientific associations.

Practical implications

Co‐operation based on mutual trust is the essential ingredient accounting for the success of participative involvement.

Originality/value

The paper incorporates all categories of personnel and specialities in a regional healthcare system that covers eight million inhabitants and employs over 90,000 professionals, includes 33 public hospitals, more than 1,500 primary care centres and other healthcare units.

Details

International Journal of Health Care Quality Assurance, vol. 24 no. 8
Type: Research Article
ISSN: 0952-6862

Keywords

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Expert briefing
Publication date: 28 June 2017

It is as yet unclear whether the police officer in question acted alone, although he apparently once worked for former Interior and Justice Minister Miguel Rodriguez Torres

Details

DOI: 10.1108/OXAN-DB221789

ISSN: 2633-304X

Keywords

Geographic
Topical
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Article
Publication date: 1 June 1993

Will Wesson

The governing principle of quality management is commitment to thecustomer and adaptation to meet customer needs. This can only be done ifit is clear who the customers are…

Abstract

The governing principle of quality management is commitment to the customer and adaptation to meet customer needs. This can only be done if it is clear who the customers are and to understand and work with their needs. Suggests ways of ensuring that development in urban areas utilizes the resources available, including the people of those areas. Examines the tensions involved. Highlights the key management issues in pursuing “partnership” as a means of regenerating cities. Looks at the role of the private sector. Concludes that all sectors need each other.

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Executive summary
Publication date: 12 May 2021

BRAZIL: Government will shift stance on vaccines

Details

DOI: 10.1108/OXAN-ES261442

ISSN: 2633-304X

Keywords

Geographic
Topical
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Executive summary
Publication date: 23 January 2018

VENEZUELA/EU: Sanctions may undermine dialogue hopes

Details

DOI: 10.1108/OXAN-ES229265

ISSN: 2633-304X

Keywords

Geographic
Topical
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Article
Publication date: 6 May 2021

Lívia Abreu Torres and Marcos Antonio Gomes Pena Jr

No matter how much human beings strive to make strictly rational choices, they are incapable of doing so because human knowledge is limited and suffers the influence of…

Abstract

Purpose

No matter how much human beings strive to make strictly rational choices, they are incapable of doing so because human knowledge is limited and suffers the influence of psychological aspects. This paper aims to demonstrate how the use of foresight methods has contributed to minimize problems inherent to human rationality through a qualitative descriptive study of the case of the Brazilian Agricultural Research Corporation – Embrapa.

Design/methodology/approach

This paper collected primary and secondary data through document analysis and interviews with managers of the Embrapa’s strategic intelligence system (SIS), Agropensa (a recognized success case of strategic intelligence (SI)/futures studies in Brazilian public administration).

Findings

The results show that it was possible to strengthen corporate behavior in the long term, minimize biases inherent to the decision-making process and bring relevant information into the management of the organization. Foresight methods and tools have made it possible to mitigate problems arising from bounded rationality (BR) in the Embrapa’s decision-making processes. The change in company’s culture potentiated long-term views and access to future-bearing information. Embrapa’s SIS contributes to mitigate difficulties inherent to human nature by bringing uncertainty into managerial discussions.

Originality/value

Taking in consideration all the advances in the future studies/SI approach, this paper realizes that this particular practical case can contribute to scientific community deepening the understanding of how a structure dedicated to run future studies/SI can diminish BR impacts on the company’s decision-making process.

Details

foresight, vol. 23 no. 4
Type: Research Article
ISSN: 1463-6689

Keywords

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Article
Publication date: 4 April 2016

Maria Torres Vega, Vittorio Sguazzo, Decebal Constantin Mocanu and Antonio Liotta

The Video Quality Metric (VQM) is one of the most used objective methods to assess video quality, because of its high correlation with the human visual system (HVS). VQM…

Abstract

Purpose

The Video Quality Metric (VQM) is one of the most used objective methods to assess video quality, because of its high correlation with the human visual system (HVS). VQM is, however, not viable in real-time deployments such as mobile streaming, not only due to its high computational demands but also because, as a Full Reference (FR) metric, it requires both the original video and its impaired counterpart. In contrast, No Reference (NR) objective algorithms operate directly on the impaired video and are considerably faster but loose out in accuracy. The purpose of this paper is to study how differently NR metrics perform in the presence of network impairments.

Design/methodology/approach

The authors assess eight NR metrics, alongside a lightweight FR metric, using VQM as benchmark in a self-developed network-impaired video data set. This paper covers a range of methods, a diverse set of video types and encoding conditions and a variety of network impairment test-cases.

Findings

The authors show the extent by which packet loss affects different video types, correlating the accuracy of NR metrics to the FR benchmark. This paper helps identifying the conditions under which simple metrics may be used effectively and indicates an avenue to control the quality of streaming systems.

Originality/value

Most studies in literature have focused on assessing streams that are either unaffected by the network (e.g. looking at the effects of video compression algorithms) or are affected by synthetic network impairments (i.e. via simulated network conditions). The authors show that when streams are affected by real network conditions, assessing Quality of Experience becomes even harder, as the existing metrics perform poorly.

Details

International Journal of Pervasive Computing and Communications, vol. 12 no. 1
Type: Research Article
ISSN: 1742-7371

Keywords

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