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Article
Publication date: 8 November 2022

Mohamed I.A. Othman, Sarhan Y. Atwa, Ebtesam E.M. Eraki and Mohamed F. Ismail

In this work, the thermoelastic response in a micro-stretch thermoelastic half-space submerged in an unlimited non-viscous fluid under gravity, the medium is studied using the…

92

Abstract

Purpose

In this work, the thermoelastic response in a micro-stretch thermoelastic half-space submerged in an unlimited non-viscous fluid under gravity, the medium is studied using the three-phase-lag model (3PHL) and Green-Naghdi theory (G-N III).

Design/methodology/approach

The normal mode analysis was the analytic technique used to obtain the exact formula of the physical quantities.

Findings

The magnesium crystal element is used as an application to compare the predictions induced by gravity on microstretch thermoelastic immersed in an infinite fluid of the three-phase-lag model with those for Green–Naghdi. Gravity has been noticed to have a major effect on all physical quantities. Comparisons were also made for three values of wave number and three values of the real part frequency.

Originality/value

This work is concerned with the thermoelastic micro-stretch solid immersed in an infinite and inviscid fluid and subjected to a gravitational field. The governing equations are formulated in the context of the 3PHL model and G-N theory. An analytical solution to the problem is obtained by employing normal mode analysis. Comparisons of the physical quantities are shown in figures to study the effects of gravity, wave number and the real part of the frequency.

Details

Multidiscipline Modeling in Materials and Structures, vol. 19 no. 1
Type: Research Article
ISSN: 1573-6105

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Article
Publication date: 30 August 2022

Mohamed I.A. Othman and Mohamed F. Ismail

This paper aims to study the gravity effects on a micro-elongated thermoelastic layer under a fluid load, utilizing the Lord–Shulman (L-S) theory and the dual-phase-lag (DPL…

68

Abstract

Purpose

This paper aims to study the gravity effects on a micro-elongated thermoelastic layer under a fluid load, utilizing the Lord–Shulman (L-S) theory and the dual-phase-lag (DPL) model.

Design/methodology/approach

The analytical method used was the normal mode which partial differential equations transform into ordinary differential equations.

Findings

Aluminum epoxy numerical computations are carried out, and the results are graphed. The DPL model and the L-S theory are compared in the complete absence and presence of gravity. Comparisons were also made for three values of and it is observed that the gravity has quite a massive influence on all physical quantities.

Originality/value

In the present paper, the authors shall create the general equation for the energy equation, which includes the two theories (DPL and L-S) as well as the solution of micro-elongated thermoelasticity under fluid load. The problem is pretty important in many dynamical systems.

Details

Multidiscipline Modeling in Materials and Structures, vol. 18 no. 5
Type: Research Article
ISSN: 1573-6105

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Article
Publication date: 25 March 2024

Mostafa Abdel-Hamied, Ahmed A.M. Abdelhafez and Gomaa Abdel-Maksoud

This study aims to focus on the main materials used in consolidation processes of illuminated paper manuscripts and leather binding.

149

Abstract

Purpose

This study aims to focus on the main materials used in consolidation processes of illuminated paper manuscripts and leather binding.

Design/methodology/approach

For each material, chemical structure, chemical composition, molecular formula, solubility, advantages, disadvantages and its role in treatment process are presented.

Findings

This study concluded that carboxy methyl cellulose, hydroxy propyl cellulose, methyl cellulose, cellulose acetate, nanocrystalline cellulose, funori, sturgeon glue, poly vinyl alcohol, chitosan, chitosan nanoparticles (NPs), gelatin, aquazol, paraloid B72 and hydroxyapatite NPs were the most common and important materials used for the consolidation of illuminated paper manuscripts. For the leather bindings, hydroxy propyl cellulose, polyethylene glycol, oligomeric melamine-formaldehyde resin, acrylic wax SC6000, pliantex, paraloid B67 and B72, silicone oil and collagen NPs are the most consolidants used.

Originality/value

Illuminated paper manuscripts with leather binding are considered one of the most important objects in libraries, museums and storehouses. The uncontrolled conditions and other deterioration factors inside the libraries and storehouses lead to degradation of these artifacts. The brittleness, fragility and weakness are considered the most common deterioration aspects of illuminated paper manuscripts and leather binding. Therefore, the consolidation process became vital and important to solve this problem. This study presents the main materials used for consolidation process of illuminated paper manuscripts and leather bindings.

Details

Pigment & Resin Technology, vol. 54 no. 3
Type: Research Article
ISSN: 0369-9420

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Article
Publication date: 4 July 2024

Muhammad Jaffar, Nazir Ahmed Jogezai, Abdul Rais Abdul Latiff, Fozia Ahmed Baloch and Gulab Khan Khilji

The objective of this study was to elucidate the intentions of university teachers regarding the utilization of ChatGPT for instructional purposes.

95

Abstract

Purpose

The objective of this study was to elucidate the intentions of university teachers regarding the utilization of ChatGPT for instructional purposes.

Design/methodology/approach

In this cross-sectional quantitative research, data were collected through an online survey tool from 493 university teachers across Pakistan.

Findings

The findings revealed that positive attitudes and a sense of perceived behavioral control had a positive impact on teachers' adoption of ChatGPT for instructional purposes. Conversely, subjective norms exhibited a significant negative influence. The results underscore that teachers are inclined to embrace ChatGPT for instructional cause due to their recognition of its educational utility. However, it does not appear that their social environment, which includes their coworkers and managers, has a significant impact on how they decide what to do.

Research limitations/implications

The findings bear implications for devising relevant policies that support AI integration in curricula and assessments and teachers’ professional development (PD) programs. There is a need for formulating guidelines at the universities and the policy tiers to make the ChatGPT use more relevant. Future research should strive to generate insights toward AI use in the areas of curriculum, assessment and teachers’ PD.

Originality/value

The study adds to the relatively new literature on the integration of ChatGPT in higher education. This study’s findings contribute to the body of knowledge related to AI’s pedagogical use and set future directions to consider factors influencing meaningful and responsible use of AI in teaching and learning.

Details

Journal of Applied Research in Higher Education, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2050-7003

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Article
Publication date: 12 August 2022

Isaac Chukwuemezu Okereke, Mohammed S. Ismail, Derek Ingham, Kevin J. Hughes, Lin Ma and Mohamed Pourkashanian

This paper aims to numerically investigate the impact of gas diffusion layer (GDL) anisotropic transport properties on the overall and local performance of polymer electrolyte…

323

Abstract

Purpose

This paper aims to numerically investigate the impact of gas diffusion layer (GDL) anisotropic transport properties on the overall and local performance of polymer electrolyte fuel cells (PEFCs).

Design/methodology/approach

A three-dimensional numerical model of a polymer electrolyte fuel cell with a single straight channel has been developed to investigate the sensitivity of the fuel cell performance to the GDL anisotropic transport properties – gas permeability, diffusivity, thermal conductivity and electrical conductivity. Realistic experimentally estimated GDL transport properties were incorporated into the developed PEFC model, and a parametric study was performed to show the effect of these properties on fuel cell performance and the distribution of the key variables of current density and oxygen concentration within the cathode GDL.

Findings

The results showed that the anisotropy of the GDL must be captured to avoid overestimation/underestimation of the performance of the modelled fuel cell. The results also showed that the fuel cell performance and the distributions of current density and oxygen mass fraction within the cathode GDL are highly sensitive to the through-plane electrical conductivity of the GDL and, to a lesser extent, the through-plane diffusivity, and the thermal conductivity of the GDL. The fuel cell performance is almost insensitive to the gas permeability of the GDL.

Practical implications

This study improves the understanding of the importance of the GDL anisotropy in the modelling of fuel cells and provides useful insights on improving the efficiency of the fuel cells.

Originality/value

Realistic experimentally estimated GDL transport properties have been incorporated into the PEFC model for the first time, allowing for more accurate prediction of the PEFC performance.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 33 no. 2
Type: Research Article
ISSN: 0961-5539

Keywords

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Abstract

Details

A Meaningful Life at Work
Type: Book
ISBN: 978-1-78756-767-2

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Article
Publication date: 9 July 2018

Mohamed Ismail Sabry

The purpose of this paper is to investigate whether formal State Business Relations (F-SBR) lead to economic growth and which institutional variables are responsible for their…

298

Abstract

Purpose

The purpose of this paper is to investigate whether formal State Business Relations (F-SBR) lead to economic growth and which institutional variables are responsible for their success in achieving this.

Design/methodology/approach

Following a theoretical analysis, several hypotheses are presented, and a number of different regression models are being used to test the hypotheses.

Findings

The paper finds that F-SBR with high government representation and business participation are likely to increase investment flows as well as help overcome some burdensome institutional settings. This could be done thanks to building trust, enhancing information exchange and better policy formulation. Despite of its suggested trust-building capacity, F-SBR seem to fail to function in cultures where trust in governments is low, since trust is a key issue for cooperation as that expected in F-SBR. On the other hand, collective but also non-hierarchical cultures that foster cooperation seem to help in the success of F-SBR. Accountability to the public and openness to various societal groups as well as good regulatory quality would help F-SBR in leading to better economic outcomes.

Practical implications

This paper, thus, suggests supporting the establishment of F-SBR with high official representation and business participation because of their positive economic value. It also suggests that voice and accountability and regulatory quality are important institutions for the realization of better economic outcomes from F-SBR.

Originality/value

The theoretical and empirical approaches used in this paper are what make it a novel endeavor in this field. Much of the suggested hypotheses were hardly discussed thoroughly elsewhere in the literature on F-SBR. Moreover, the proxy used for F-SBR, constructed by the interaction term of government official representation and the level of business representation, made it possible to conduct empirical testing on a global level, something barely done in works on F-SBR experiences worldwide. The obtained results supported some of the arguments uttered in the literature while raising questions on others, opening the field for future research on the matter.

Details

International Journal of Social Economics, vol. 45 no. 7
Type: Research Article
ISSN: 0306-8293

Keywords

Available. Open Access. Open Access
Article
Publication date: 13 July 2023

Mohamed Samy El-Deeb, Tariq H. Ismail and Alia Adel El Banna

This paper aims to examine the impact of environmental, social and governance (ESG) disclosure and firm value (FV), as well as, pinpoints the role of the audit quality (AQ) as a…

8312

Abstract

Purpose

This paper aims to examine the impact of environmental, social and governance (ESG) disclosure and firm value (FV), as well as, pinpoints the role of the audit quality (AQ) as a moderating variable on such impact; where the authors hypothesize that AQ modulates the relationship between ESG disclosure and the FV.

Design/methodology/approach

Data of a sample of firms listed on the Egyptian Stock Exchange Market (EGX) were collected over the period of 2017–2021 and analyzed using the regression and 2SLS models.

Findings

The results suggested that: (1) the ESG has a significant positive impact on the FV in the EGX, and (2) AQ has a significant impact, as a moderating variable, on the relationship between ESG disclosure and FV.

Research limitations/implications

The findings would help the Egyptian market authorities in realizing the importance of integrating ESG information within the financial reports of the listed firms. The findings could also help in developing effective disclosure procedures to provide shareholders with useful information.

Originality/value

This paper contributes to the literature regarding the ESG disclosure components and the FV value by considering AQ in testing such relationship.

Details

Journal of Humanities and Applied Social Sciences, vol. 5 no. 4
Type: Research Article
ISSN: 2632-279X

Keywords

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Article
Publication date: 18 January 2019

Mohamed Kezzar, Nawel Boumaiza, Ismail Tabet and Nourreddine Nafir

This paper aims to traitted the combined effects of ferromagnetic particles and magnetic field on mixed convection in the Falkner Skan equation using analytical solution by the…

101

Abstract

Purpose

This paper aims to traitted the combined effects of ferromagnetic particles and magnetic field on mixed convection in the Falkner Skan equation using analytical solution by the Duan–Rach method.

Design/methodology/approach

Visualization and grouping of effects of various physical parameters such as electrical conductivity of ferro-particles (electrical conductivity calculated using Maxwell model), ferro fluid volume fraction for Magnetite-Fe3O4-water and magnetic field represented by the Hartmann number in a set of third- and second-order nonlinear coupled ordinary differential equations. This set of equations is analytically processed using the Duan–Rach Approach (DRA).

Findings

Obtained DRA results are validated using a numerical solution (Runge–Kutta–Fehlberg-based shooting method). The main objective of this research is to analyze the influence of physical parameters, in particular electrical conductivity, Ferrofluid volume fraction in the case of Magnetite-Fe3O4-water, in addition to the types of solid nanoparticles and Hartmann number on dynamic and thermal distributions (velocity/temperature). Results of the comparison between the numerical solution (Runge–Kutta–Fehlberg-based shooting method) and the analytical solution (DRA) show that the DRA data are in good agreement with numerical data and available literature.

Originality/value

The study uses Runge–Kutta–Fehlberg-based shooting method) and the analytical solution (DRA) to investigate the effect of mixed convection, in the presence of Ferro particles (Magnetite-Fe3O4) in a basic fluid (water for example) and subjected to an external magnetic field on the Falkner–Skan system.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 29 no. 2
Type: Research Article
ISSN: 0961-5539

Keywords

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Article
Publication date: 12 February 2024

Bataa Sayed Mohamed Mazen, Badawi Mohamed Ismail, Rushdya Rabee Ali Hassan, Mahmoud Ali and Wael S. Mohamed

The purpose of this study is to detect the effect of some natural cellulosic polymers in their nano forms with the addition of zinc oxide nanoparticles on restoring the lost…

113

Abstract

Purpose

The purpose of this study is to detect the effect of some natural cellulosic polymers in their nano forms with the addition of zinc oxide nanoparticles on restoring the lost mechanical strength of degraded papyrus without any harmful effects on the inks.

Design/methodology/approach

In the current study, the USB digital microscopy, scanning electron microscope, measurement of mechanical properties (tensile and elongation), pH measurement, color change and infrared spectroscopy were undertaken for the samples before and after treatment and aging.

Findings

In the current study, the USB digital microscopy, scanning electron microscope, measurement of mechanical properties (tensile and elongation), pH measurement, color change and infrared spectroscopy were undertaken for the samples before and after treatment and aging.

Originality/value

The effect of strengthening materials was studied on cellulose and carbon ink, which makes this study closer to reality as the manuscript is the consistent structure of cellulose and inks, whereas most of the literature stated the impact of consolidation materials on the strengthening the cellulosic supports without attention to their impact on inks.

Details

Pigment & Resin Technology, vol. 54 no. 2
Type: Research Article
ISSN: 0369-9420

Keywords

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