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Article
Publication date: 25 December 2020

Ahmed S. Abd Elrahman

The world has recently faced the outbreak of an existential threat. Since December 2019, many aspects of life have changed owing to a devastating pandemic, COVID-19. The…

Abstract

Purpose

The world has recently faced the outbreak of an existential threat. Since December 2019, many aspects of life have changed owing to a devastating pandemic, COVID-19. The second wave started spreading in different parts of the globe. This article focuses on the impact of COVID-19 on Cairo city, regarding three upper-middle-class districts as a case study. Based on a literature review, a theoretical framework is proposed to analyse how residents changed their living, work, and leisure time habits during the outbreak of the pandemic.

Design/methodology/approach

A retrospective survey was conducted among the residents of three districts to investigate the new living model of adaptive, spontaneous urban and architecture design tactics that transfer people’s actual life, work, and leisure arrangements into future planning considerations.

Findings

The results reveal relevant observations about the adaptation of the existing environments of home, work, and leisure activities. From these results, different considerations and new norms emerge for housing typologies in post-pandemic Cairo.

Originality/value

The conclusions of this study introduced the new term “the fifth place” as a space-time place that could serve as a motivation for urban designers and architects to design space typologies considering the emerging circumstances.

Details

Archnet-IJAR: International Journal of Architectural Research, vol. 15 no. 1
Type: Research Article
ISSN: 2631-6862

Keywords

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Article
Publication date: 28 September 2020

Abd-Elrahman Hassanein Abd-Elrahman and Jaber Mohamed Ahmed Kamal

The purpose of this paper is to empirically investigate the mediating effect of service quality (SQ) in the relationship between relational capital (RC) and organizational…

Abstract

Purpose

The purpose of this paper is to empirically investigate the mediating effect of service quality (SQ) in the relationship between relational capital (RC) and organizational performance (OP) within the Egyptian mobile telecommunication setting.

Design/methodology/approach

A valid research instrument was utilized to conduct a survey of 384 top- middle- and supervisory- level managers from three Egyptian mobile telecommunications companies. The hypothesized direct relationships were tested through multiple linear regression, and the mediating effect was tested using a structural equation modeling technique.

Findings

The results revealed that the firm's “customer and supplier relations” and “marketing capability” positively affect both OP and SQ, “customer knowledge” positively affects SQ only, while “strategic alliances, licensing and agreements” do not have an association with SQ or OP. Moreover, SQ was found fully mediating the effect of RC on OP.

Research limitations/implications

This is an empirical research applied in the Egyptian telecommunication setting. Its results need further investigation in other settings and countries. Also, traditional limitations of a cross-sectional study apply with respect to the attribution of causality and the time lag effects.

Practical implications

The optimal procedure for the Egyptian telecommunications companies is to focus their efforts on leveraging all four components of RC in order to improve SQ and consequently enhance their OP. The telecommunications companies must do all they can to connect the unconnected. As the current COVID-19 pandemic crisis has shown, connectivity is a public good.

Originality/value

This is the first research that merges the concepts of RC, SQ and OP in an integrated model, and tests this model empirically in the Egyptian mobile telecommunications setting.

Details

International Journal of Emerging Markets, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1746-8809

Keywords

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Article
Publication date: 7 August 2018

Yasser Abdelrhman, Ahmed Abouel-Kasem, Karam Emara and Shemy Ahmed

This paper aims to clarify the relationship between the slurry erosion and one of the case hardening treatments, i.e. boronizing in this study, for AISI-5117 steel alloy…

Abstract

Purpose

This paper aims to clarify the relationship between the slurry erosion and one of the case hardening treatments, i.e. boronizing in this study, for AISI-5117 steel alloy. AISI-5117 steel alloy was used because of its variety applications in the field of submarine equipment. Most of the slurry erosion factors such as velocity, impact angle and mechanism of erosion were studied at different impact angles.

Design/methodology/approach

At first, the samples were prepared and subjected to the boronizing treatment in controlled atmosphere. By using a slurry erosion test-rig, all experiments for studying the slurry erosion factors were carried out. Moreover, the studied specimens were investigated via scanning electron microscope, optical microscope and X-ray diffraction to study the erosion mechanism in the different conditions.

Findings

It was expected that the boronization of the AISI-5117 steel would increase its slurry erosion resistance due to its positive impact on the surface hardness. However, the results observed show the opposite, where the boronization of AISI-5117 steel decreased its slurry erosion resistance as implied by the increase of the mass loss percentage at all impact angles.

Originality/value

This research, for the first time, exhibits the effect of boronizing treatment on the slurry erosion in different impact factors accompanied by the erosion mechanism at each impact angle.

Details

Industrial Lubrication and Tribology, vol. 70 no. 7
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 13 May 2020

H. Abd El-Wahab, G.A. Meligi, M.G. Hassaan and L. Lin

The purpose of this study is to prepare, characterise and evaluate nano-emulsions of ter-polymers of various compositions as eco-friendly binders for flexographic ink industry.

Abstract

Purpose

The purpose of this study is to prepare, characterise and evaluate nano-emulsions of ter-polymers of various compositions as eco-friendly binders for flexographic ink industry.

Design/methodology/approach

Various nano-emulsions of ter-polymers were prepared based on Vinyl acetate, Vinyl Versatate, butyl acrylate, acrylic acid and acrylamide monomers by means of a conventional seeded emulsion polymerisation technique, using K2S2O8 as the initiator. The characterisation of the prepared emulsions was performed using Fourier transform infrared, thermo-gravimetric analysis, gel permeation chromatography and transmission electron microscopy. A selection of co-polymers and ter-polymers were formulated with pigments and additional ingredients, as water-based flexographic inks. The inks were characterised for their rheological properties, pH, degree of dispersion, water-resistance and colour density.

Findings

It was found that the low viscosity of the prepared polymers may reduce the film thickness of the flexographic inks and may also increase the spreading of the ink on the surface. As a result, stable modified poly acrylate-based latex with improved physico-mechanical properties was obtained. The prepared latexes showed improved properties such as enhanced thermal stability and better water resistance. The effect of the emulsifier type on the properties of the resulting emulsion latexes and their corresponding films were investigated. Also, as the hydrophobic monomer increases, so does the colour density and increasing the binder ratio enhances the gloss values. The improving in gloss values were obtained and provide excellent adhesion properties for both the pigment particles and the base paper.

Research limitations/implications

The study focusses on the preparation of new water-based ter-polymer nano-particles and their use as eco-friendly binders for flexographic ink industry. Ink formulations based on other different type emulsion polymers could also be studied to assess the applicability of the ink formulation system found for other binders.

Practical implications

The ink formulations developed could find use in industrial-scale printing.

Originality/value

Eco-friendly environment and low-cost ink formulations for printing on paper substrates are novel.

Details

Pigment & Resin Technology, vol. 49 no. 6
Type: Research Article
ISSN: 0369-9420

Keywords

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Article
Publication date: 24 January 2020

H. Abd El-Wahab, G. El-Meligi, M.G. Hassaan, A. Kazlauciunas and Long Lin

The purpose of this paper is to prepare, characterise and evaluate nano-emulsions of copolymers of various compositions as eco-friendly binders for flexographic ink industry.

Abstract

Purpose

The purpose of this paper is to prepare, characterise and evaluate nano-emulsions of copolymers of various compositions as eco-friendly binders for flexographic ink industry.

Design/methodology/approach

Various nano-emulsions of copolymers were prepared using styrene (St), butyl acrylate (BuAc), acrylic acid (AA) and acrylamide (AAm) monomers by means of a conventional seeded emulsion polymerisation technique, using K2S2O8 as the initiator. The characterisation of the prepared emulsions was performed using Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA), gel permeation chromatography (GPC) and transmission electron microscopy (TEM). A selection of copolymers was formulated with pigments and additional ingredients, as water-based flexographic inks. The inks were characterised for their viscosity, pH, degree of dispersion, water resistance and colour density.

Findings

It was found that the low viscosity of the prepared copolymers may reduce the film thickness of the flexographic inks and may also increase the spreading of the ink on the surface. As a result, stable modified polyacrylate-based latex with improved physico-mechanical properties were obtained. The prepared latexes were showed improving and enhancing in water resistance; gloss values, and the print density that ranged from 2.06 to 2.51 and the maximum gloss values (39 and 48) were also obtained. Also, these binders provide excellent adhesion properties for both the pigment particles and the base paper.

Practical implications

This study focuses on the preparation of new water-based copolymer nanoparticles and their use as eco-friendly binders for flexographic ink industry.

Social implications

The ink formulations developed could find use in industrial-scale printing.

Originality/value

Eco-friendly environment ink formulations for printing on paper substrates are novel.

Details

Pigment & Resin Technology, vol. 49 no. 3
Type: Research Article
ISSN: 0369-9420

Keywords

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