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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

Article
Publication date: 9 August 2011

Oleg Rybin, Konstantin Yemelyanov and Tahira Nawaz

The purpose of this paper is to obtain the long‐wave approximations for the effective electromagnetic response of two‐dimensional sandwich composite structure, as infinite…

Abstract

Purpose

The purpose of this paper is to obtain the long‐wave approximations for the effective electromagnetic response of two‐dimensional sandwich composite structure, as infinite chain of infinitely long metal cylinders symmetrically immersed in an infinite metamaterial slab are obtained. The slab is an infinite magneto‐dielectric matrix with periodically imbedded infinitely long metal cylinders whose diameter is smaller than those of the chain cylinders. The case of ferrite‐like metallic saturated inclusions is considered in the study.

Design/methodology/approach

The result is presented as a generalized expression of the electromagnetic response of the infinite periodic chain of infinitely long metallic cylinders immersed into the flat magneto‐dielectric host medium. Those expressions were obtained utilizing S‐ and T‐matrices approaches.

Findings

A good coincidence between the results of analytical modeling and numerical simulations was found.

Research limitations/implications

Low values of the metal volume fraction; microwave frequency range.

Practical implications

An improving of directivity of patch antennas; a minimization of patch antennas.

Originality/value

The analytical characterization of new artificial substrate‐like structure to be utilized for designing patch antennas of a new generation.

Details

Multidiscipline Modeling in Materials and Structures, vol. 7 no. 2
Type: Research Article
ISSN: 1573-6105

Keywords

Article
Publication date: 6 November 2020

Amjad Iqbal, Tahira Nazir and Muhammad Shakil Ahmad

The purpose of this research is to determine the relationship between entrepreneurial leadership and employee innovative behavior and examine mediating role of affective…

1063

Abstract

Purpose

The purpose of this research is to determine the relationship between entrepreneurial leadership and employee innovative behavior and examine mediating role of affective commitment, creative self-efficacy and psychological safety in this relationship.

Design/methodology/approach

Using cross-sectional research design, data were collected from 343 employees of information technology (IT) service firms in Pakistan. Partial least squares–structural equation modeling (PLS-SEM) technique was applied to test the proposed research model.

Findings

The findings reveal that entrepreneurial leadership is strongly and positively related to employee innovative behavior. Moreover, affective commitment, creative self-efficacy and psychological safety simultaneously mediate this relationship.

Practical implications

This study uncovers the important role of entrepreneurial leadership in driving employee innovative behavior in high-tech services industry. Findings of this study suggest that by practicing entrepreneurial behaviors, managers can enhance employees' affective commitment, creative self-efficacy and psychological safety, which invoke employees to demonstrate innovative behavior leading toward improved innovation performance at organizational level.

Originality/value

This research makes novel contribution to entrepreneurial leadership theory by using competing theoretical perspectives and subsequently providing more nuanced picture of the contrasting mechanisms that transmit the impact of entrepreneurial leadership on employee innovative behavior.

Details

European Journal of Innovation Management, vol. 25 no. 1
Type: Research Article
ISSN: 1460-1060

Keywords

Article
Publication date: 9 July 2020

Chinu Chacko and Rajamohan Thankappan

The purpose of this paper is to compare the effects of repeatedly heated coconut oil, mustard oil and sunflower oil on antioxidant status in cholesterol-fed Sprague Dawley rats.

Abstract

Purpose

The purpose of this paper is to compare the effects of repeatedly heated coconut oil, mustard oil and sunflower oil on antioxidant status in cholesterol-fed Sprague Dawley rats.

Design/methodology/approach

The test oils were heated at 210 ± 10°C for 15 h. Male Sprague Dawley rats were divided into six groups of six animals each. In total, 15% fresh/heated oils and 1% cholesterol were mixed with the experimental diet and fed to the animals for 60 days.

Findings

Chemical analysis revealed that repeated heating of oils resulted in changes in fatty acid composition and elevated lipid peroxidation, the effects being lower in heated coconut oil. Body weight gain significantly decreased in heated coconut oil (p = 0.02), heated mustard oil (p = 0.022) and heated sunflower oil (p = 0.001) fed animals. Malondialdehyde level was significantly increased (p = 0.001) in tissues of heated oils fed animals. Concentration of protein oxidation products was significantly increased (p = 0.001) in heated oils fed animals. Activities of antioxidant enzymes were decreased (p = 0.001) in heated oils fed animals. Total thiols were decreased (p = 0.001) in tissues of animals that were fed heated oils. Animals that were fed heated mustard oil and heated sunflower oil showed lower antioxidant levels and higher oxidation products when compared to those fed heated coconut oil.

Originality/value

Studies comparing the effects of thermally oxidized oils that vary in fatty acid composition are rare. The effects of fresh and heated oils that vary in fatty acid constitution, namely, coconut oil, mustard oil and sunflower oil, in cholesterol-fed rats are studied.

Details

Nutrition & Food Science , vol. 51 no. 2
Type: Research Article
ISSN: 0034-6659

Keywords

Article
Publication date: 23 February 2021

Muhammad Farrukh, Fanchen Meng and Ali Raza

A leader's job is not to put greatness into people, but rather to recognize that it already exists and to create an environment where that greatness can emerge and grow…

Abstract

Purpose

A leader's job is not to put greatness into people, but rather to recognize that it already exists and to create an environment where that greatness can emerge and grow (Smith, 2014). Based on Brad Smith's quote, the purpose of this study is to investigate the role of the leader's expectations, leader-member exchange (LMX) and organizational climate for innovation in fostering the intrapreneurial behavior (IB) of employees.

Design/methodology/approach

Data were collected from employees and their supervisors working across industries such as pharmaceutical, chemical, engineering and manufacturing. Collected data were then analyzed using the structural equation modeling technique.

Findings

The authors’ results show that LMX and leaders' expectations are positively linked to employees' IB. Moreover, this association is mediated by organizational climate.

Practical implications

This study's findings contribute to the literature on intrapreneurship and may also help practitioners formulate interventions to foster IB in organizations that will ultimately lead to higher performance.

Originality/value

This study attempted to investigate the effect of LMX and the Pygmalion effect on IB through employees' perception of organizational climate for innovation. The literature in this field is scarce and theoretical development is weak because traditional collaborative or participative leadership approaches are more relevant to an outcome than innovation.

Details

European Journal of Innovation Management, vol. 25 no. 3
Type: Research Article
ISSN: 1460-1060

Keywords

Article
Publication date: 25 June 2021

Gedif Tessema Sinshaw, Atul Shiva and Manjit Singh

This paper aims to examine the mediating role of knowledge process capability (KPC) between ethical leadership (EL) and administrative innovation (AI) in the banking…

Abstract

Purpose

This paper aims to examine the mediating role of knowledge process capability (KPC) between ethical leadership (EL) and administrative innovation (AI) in the banking sector of Ethiopia.

Design/methodology/approach

The study was conducted by a standardized questionnaire survey to collect the data from 266 employees of Commercial Bank of Ethiopia in 93 branches. The study employed structural equation modeling approach with Analyzing Moment of Structures 23.0 to test the hypothesized mediation model.

Findings

The results of this investigation disclose that EL has a significant and direct effect on AI and KPC. KPC also influences AI significantly.

Originality/value

The study revealed that KPC plays a partial mediating role in linking EL to AI, which is a new contribution to the existing literature of EL. This dimension can provide new dimensions to design organizational leadership which is based on sustainability paradigm. This can strengthen the organizational capabilities aiming to increasing innovative behaviors in order to have a deep-seated strategy.

Details

Journal of Management Development, vol. 40 no. 5
Type: Research Article
ISSN: 0262-1711

Keywords

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