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Article
Publication date: 27 September 2011

Oleg Rybin, Konstantin Yemelyanov, Amjad Pitafi and Tahira Nawaz

The purpose of this paper is to study the microwave behaviour of effective magnetic permeability for two‐component ferrite like metamaterial medium in the direction of a…

Abstract

Purpose

The purpose of this paper is to study the microwave behaviour of effective magnetic permeability for two‐component ferrite like metamaterial medium in the direction of a biasing magnetic field. The metamaterial medium is presented as an infinite host dielectric material (air) with periodically embedded ferric cylindrical and spherical inclusions saturated with an external dc magnetic field. The study is based on the effective medium theory developed for polycrystalline metaferrites. The simulations show that the presented metamaterial can exhibit the ultra‐low refractive index (ULI) phenomenon and the phenomenon of negative magnetic permeability for the case of microwave propagation in the direction of bias.

Design/methodology/approach

The obtained results are based on the wave long approximation of permeability tensor of the presented metamaterial media obtained earlier by the first author. Using the standard approach, the authors apply the above expressions for the microwave propagation in direction of biasing dc magnetic field considering different polarization of the incident microwave.

Findings

The considered artificial material media can become either material with a ULI or with negative values in the GHz frequencies.

Originality/value

The paper is concerned with part of the theory of a new generation of artificial ferrites.

Details

Multidiscipline Modeling in Materials and Structures, vol. 7 no. 3
Type: Research Article
ISSN: 1573-6105

Keywords

Book part
Publication date: 9 June 2022

Sylvia Nabila Azwa Ambad

Social entrepreneurship has played a significant role in reducing unemployment and poverty, fixing other social issues and environmental concerns. Although there is an…

Abstract

Social entrepreneurship has played a significant role in reducing unemployment and poverty, fixing other social issues and environmental concerns. Although there is an increasing concern on social entrepreneurship by the public sector, practitioner and scholars, there are still limited studies on predicting the intention to become a social entrepreneur. Thus, investigating social entrepreneurship intention using a systematic literature review (SLR) approach is crucial due to the lack of systematisation and categorisation in this field. Therefore, this study aims to conduct a SLR to identify the antecedents of social entrepreneurial intention (SEI) used by the previous research. In this sense, this chapter carries out a systematic review of the literature on social entrepreneurship intentions. The review is guided by the PRISMA Statement (Preferred Reporting Items for Systematic reviews and Meta-Analyses). After the identification and screening process, only 56 articles were qualified for further analysis. This SLR focused on articles that are using quantitative research and in the English language published in Scopus. Although there is no limitation in the timeline, the search string results found that the related articles were published between 2010 and 2020. From the thematic analysis, nine main themes were found. The themes are categorised based on the antecedents of SEI used by previous research. There are nine antecedents found: (1) perceived desirability and feasibility, (2) attitude, subjective norms and perceived behavioural control, (3) prior experience, (4) emotional factors, (5) self-efficacy, (6) personality, (7) support systems, (8) skills and competencies and (9) motivational factors. Further analysis of the themes has resulted in ten sub-themes. This chapter's contribution includes offering a clearer picture of the antecedents of social entrepreneurial intention that is still at its infancy stage. Additionally, this chapter managed to identify the research gaps and proposed future research agenda.

Article
Publication date: 7 June 2022

Wassim J. Aloulou and Eidah A. Algarni

Little previous research has investigated the determinants of social entrepreneurial intention (SEI) in the context of Saudi Arabia. The purpose of this study is to…

Abstract

Purpose

Little previous research has investigated the determinants of social entrepreneurial intention (SEI) in the context of Saudi Arabia. The purpose of this study is to advance a research model that examines the direct and indirect effects of prior experience with social problems via empathy, moral obligation, social self-efficacy and perceived social support on SEI.

Design/methodology/approach

This study is based on data collected from a survey using questionnaires completed by 278 Saudis. To analyze data and test the developed hypotheses, an exploratory and a confirmatory factor analyses were conducted to investigate the factorial structural of the constructs, their reliability and validity. Then, goodness-of-fit statistics showed model fits of different alternative models. A hierarchical regression modeling was used to test the direct and indirect effects of main variables on SEI.

Findings

Results show positive relationships between prior experience with social problems and SEI antecedents, on one hand, and between prior experience with social problems and SEI on the other hand. Notably, no significant relationships exist between moral obligation and SEI and social support and SEI. Additionally, only empathy and social self-efficacy mediated the relationship of prior experience with social problems to SEI.

Research limitations/implications

This study contributes to the literature by showing how most of the SEI’s antecedents can play a mediating role between prior experience with social problems and SEI. The main limitation of this study is that it was not possible to generalize the findings. Future research perspectives were proposed to address this limitation and add new insights to the field considering the context of an emerging country.

Originality/value

This study is one of the first to conduct such an investigation in the Saudi context. It validates the scales of previous empirical models on SEI and partially replicates their results.

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