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Article
Publication date: 18 October 2019

Rahul S.G. and Sharmila A.

The purpose of this study is to present a comprehensive review of the fundamental concepts and terminologies pertaining to different types of aluminium metal matrix composites…

229

Abstract

Purpose

The purpose of this study is to present a comprehensive review of the fundamental concepts and terminologies pertaining to different types of aluminium metal matrix composites, their joining techniques and challenges, friction stir welding (FSW) process, post-welding characterizations and basic control theory of FSW, followed by the discussions on the research reports in these areas.

Design/methodology/approach

Joining of aluminium metal matrix composites (Al-MMC) poses many challenges. These materials have their demanding applications in versatile domains, and hence it is essential to understand their weldability and material characteristics. FSW is a feasible choice for joining of Al-MMC over the fusion welding because of the formation of narrow heat affected zone and minimizing the formation of intermetallic compounds at weld interface. The goal in FSW is to generate enough thermal energy by friction between the workpiece and rotating tool. Heat energy is generated by mechanical interaction because of the difference in velocity between the workpiece and rotating tool. In the present work, a detailed survey is done on the above topics and an organised conceptual context is presented. A complete discussion on significance of FSW process parameters, control schemes, parameter optimization and weld quality monitoring are presented, along with the analysis on relation between the interdependent parameters.

Findings

Results from the study present the research gaps in the FSW studies for joining of the aluminium-based metal matrix composites, and they highlight further scope of studies pertaining to this domain.

Originality/value

It is observed that the survey done on FSW of Al-MMCs and their control theory give an insight into the fundamental concepts pertaining to this research area to enhance interdisciplinary technology exploration.

Details

World Journal of Engineering, vol. 16 no. 6
Type: Research Article
ISSN: 1708-5284

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Book part
Publication date: 22 August 2022

Ankita Ghosh and Swathi Ravichandran

This chapter aims to assess the scope of India's gastronomic tourism post-COVID-19 and discuss the utilisation of vlogs to promote India as a gastronomic destination. First, the…

Abstract

This chapter aims to assess the scope of India's gastronomic tourism post-COVID-19 and discuss the utilisation of vlogs to promote India as a gastronomic destination. First, the evolution of gastronomic tourism is reviewed. Next, opportunities and challenges associated with India's gastronomic offerings, both from international and domestic tourism perspectives, are discussed. Then, the role of vlogging to position and promote India as a gastronomic destination is established. The chapter suggests recommendations for the Ministry of Tourism, Government of India on utilising vlogging to promote gastronomic tourism.

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Article
Publication date: 2 November 2020

Vishal R. Mehta and Mayur P. Sutaria

The purpose of this paper is to evaluate the influence of temperature, load and sliding speed on wear and friction behavior of LM25/SiC composites in as-cast and heat-treated…

69

Abstract

Purpose

The purpose of this paper is to evaluate the influence of temperature, load and sliding speed on wear and friction behavior of LM25/SiC composites in as-cast and heat-treated conditions.

Design/methodology/approach

The LM25/SiC aluminum matrix composites (AMCs) were prepared using the stir casting process. The wear tests were carried out using a pin-on-disc setup in dry condition. The three levels of each parameter, i.e. 100, 150 and 200°C operating temperature; 15, 25 and 35 N load; 0.8, 1.6 and 2.4 m/sec sliding speed, were considered for the investigation. ANOVA has been carried out to evaluate the percentage contribution of parameters. Scanning electron microscope analysis of worn surfaces has been carried out to understand the wear mechanism.

Findings

The wear and coefficient of friction (COF) increase with the increase in the temperature, load and sliding speed within a selected range for as-cast as well as heat-treated LM25/SiC AMCs. The mean values of wear and COF in heat-treated samples were found to be lower than as-cast samples for all cases. It was observed that the percentage wear increases significantly as temperature increases in as-cast AMCS. Mild to severe wear transition was observed at 150°C. In heat-treated AMCs, mild wear was observed irrespective of temperature. It was also observed that as the temperature increases, transition of wear mechanism from abrasive to adhesive (including delamination) occurs earlier in as-cast samples as compared to heat-treated samples.

Originality/value

There is a lack of data on combined effect of temperature, load and sliding speed on tribological aspects of as-cast and heat-treated LM25/SiC AMCs, limiting its applications. The present research work has addressed this gap.

Details

World Journal of Engineering, vol. 18 no. 2
Type: Research Article
ISSN: 1708-5284

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Book part
Publication date: 10 January 2007

Sue Walters

Writers present very different descriptions of what constitutes ‘ethnography’ and ‘case study’. While not attempting to review the literature, nor to comment on or endorse the…

Abstract

Writers present very different descriptions of what constitutes ‘ethnography’ and ‘case study’. While not attempting to review the literature, nor to comment on or endorse the overall quality of argument and presentation of research methodology made by each of the authors considered here, the following demonstrates how different the explanations and definitions offered can be.

Details

Methodological Developments in Ethnography
Type: Book
ISBN: 978-1-84950-500-0

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Book part
Publication date: 30 September 2020

Dana A. Robertson, Evelyn Ford-Connors, Susan Dougherty and Jeanne R. Paratore

Purpose: To describe how an approach to instruction that intentionally considers elements of motivation and engagement, intensity of instruction, and cognitive challenge can…

Abstract

Purpose: To describe how an approach to instruction that intentionally considers elements of motivation and engagement, intensity of instruction, and cognitive challenge can accelerate the reading achievement of lower-performing readers by giving them access to and support to meet reading and knowledge building with success.

Design: The authors discuss a set of high-leverage practices squarely under the teacher’s control. Grounded in longstanding and rigorous research, the integrated set of practices have been shown time and time again to accelerate achievement beyond typical growth while also intentionally considering the experiences, cultures, and linguistic knowledge students bring to the classroom. The re-conceptualized approach forefronts student agency and engages students in meaningful interactions with text to build knowledge of the world they live in.

Findings: The authors illustrate the comprehensive approach through a composite vignette drawn from work with teachers and students in school and clinical contexts. The focus of the vignette is on the actions of the classroom teacher who is working to meet the needs of three struggling readers within the broader context of her 5th-grade classroom, while also establishing a coherent instructional approach with fellow teachers.

Practical Implications: By re-conceptualizing their approaches to working with struggling readers, teachers increase the likelihood that students will not only develop component skills related to reading but also integrate these components and develop the conceptual expertise that anchors future reading and learning.

Details

What’s Hot in Literacy: Exemplar Models of Effective Practice
Type: Book
ISBN: 978-1-83909-874-1

Keywords

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Case study
Publication date: 24 November 2023

Frank Peter Jordan and Anna Lašáková

After completion of the case study, the students will be able to understand the importance of being culturally savvy when working in a culturally diverse environment and managing…

Abstract

Learning outcomes

After completion of the case study, the students will be able to understand the importance of being culturally savvy when working in a culturally diverse environment and managing people from different cultures; critically reflect on the risks resulting from the absence of a clear direction from the company’s top management regarding unifying corporate values and a diversity policy for cooperation across cultures; be aware of best practices in implementing diversity management (DM) initiatives in the company; and learn that changes in the strategic orientation (i.e. focus on automation projects) must be cascaded down to hard elements of structures, processes and systems, as well as to soft elements of skills, staff and management style.

Case overview/synopsis

The Kuwaiti branch of a Japanese corporation specialising in control systems and instruments, Rising Sun IT, hired a German professional, Alex, to handle the increasing demand for automation from customers. This recruitment followed several unsuccessful attempts by the company to deliver more advanced automation solutions. Recognising the need to adapt to Kuwaiti customer requirements or risk losing market share, Japanese management understood the importance of transforming their engineering staff. Failure to achieve this next automation step would result in a steady decline in market share and ultimately impact the company’s survival. However, Alex, who was supposed to lead automation projects, was confronted with opposition from the Indian engineering staff and managers. He was not able to find common ground with the staff and perceived issues such as lack of communication, delays in work schedules, missed deadlines and high levels of absenteeism, as a sign of low work morale. Although he tried to increase the awareness of his supervisor and other managers by informing them repeatedly about the problems regarding employee behaviours, his interventions went unheard. He felt ousted by his fellow colleagues and the other employees. Besides, from Alex’s point of view, the Japanese top management did not provide clear directions to the staff and explicit support to Alex in his efforts. This case study highlights three dimensions of Alex’s problem with establishing and maintaining working relationships with other people in the company:▪ Alex’s cultural “blindness” and ignorance of differences in work behaviours that ultimately led to his inability to build solid and trustful relationships with other employees. The case study demonstrates Germany’s performance-oriented and individual-centric culture versus India’s family- and community-oriented culture and the Japanese employees’ strongly hierarchical and company loyalty-oriented culture.▪ Lack of support from the Japanese top management to Alex, which is connected with a wider problem of the lack of a systematic strategic approach to managing a culturally diverse workforce. The case study pinpoints the rhetoric–reality gap in DM in the company, where the diversity, equity and inclusion programme and corporate values were applied only formally and had little attention from the leaders as well as non-managerial employees.▪ Employee resistance to change: The lack of positive communication from the top management level in the company regarding automation projects and the lack of support for Alex’s mission in the company resulted in steady resistance to executing projects, which endangered the company’s survival in the market. Also, one part of Alex’s problem with building a working relationship with the Indian engineering staff was based on the fact that others perceived him as the automation “change agent” – an advocate and catalyst of an undesirable change connected with adverse consequences on employment in the Indian community.

Complexity academic level

This case is intended for discussion in undergraduate management and business study programmes.

Supplementary materials

Teaching notes are available for educators only.

Subject code

CSS 6: Human resource management.

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Article
Publication date: 16 May 2019

Rahul Bansal and Sudipta Majumdar

This paper aims to present the estimation of the output voltage of metal oxide semiconductor field effect transistor (MOSFET) using the extended Kalman filter (EKF) method.

156

Abstract

Purpose

This paper aims to present the estimation of the output voltage of metal oxide semiconductor field effect transistor (MOSFET) using the extended Kalman filter (EKF) method.

Design/methodology/approach

The method uses EKF for MOSFET output voltage estimation. To implement the EKF method, the state space model has been obtained using Kirchhoff’s current law and Enz-Krummenacher-Vittoz model of the MOSFET circuit.

Findings

The proposed method can be used for any mode of MOSFET operation besides near the quiescent point region. The nonlinearity that occurs in the saturation region of MOSFET can also be considered in the proposed method. The proposed method can also be used for a large input signal. Though Kalman filter can be used for the small amplitude input signal, it results in inaccurate estimation due to the linearization of the nonlinear system.

Research limitations/implications

The method is able to track the parameters when they are slowly changing with time.

Originality/value

The proposed method presents maximal precision of simulation as the maximal precision of simulation requires modeling of the circuit in terms of device parameters and circuit elements.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 38 no. 6
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 17 May 2021

Akash K. Gupta, Rahul Yadav, Malay K. Das and Pradipta K. Panigrahi

This paper aims to present the implementation of a multi-layer radiation propagation model in simulations of multi-phase flow and heat transfer, for a dissociating methane hydrate…

154

Abstract

Purpose

This paper aims to present the implementation of a multi-layer radiation propagation model in simulations of multi-phase flow and heat transfer, for a dissociating methane hydrate reservoir subjected to microwave heating.

Design/methodology/approach

To model the induced heterogeneity due to dissociation of hydrates in the reservoir, a multiple homogeneous layer approach, used in food processes modelling, is suggested. The multi-layer model is incorporated in an in-house, multi-phase, multi-component hydrate dissociation simulator based on the finite volume method. The modified simulator is validated with standard experimental results in the literature and subsequently applied to a hydrate reservoir to study the effect of water content and sand dielectric nature on radiation propagation and hydrate dissociation.

Findings

The comparison of the multi-layer model with experimental results show a maximum difference in temperature estimation to be less than 2.5 K. For reservoir scale simulations, three homogeneous layers are observed to be sufficient to model the induced heterogeneity. There is a significant contribution of dielectric properties of sediments and water content of the reservoir in microwave radiation attenuation and overall hydrate dissociation. A high saturation reservoir may not always provide high gas recovery by dissociation of hydrates in the case of microwave heating.

Originality/value

The multi-layer approach to model microwave radiation propagation is introduced and tested for the first time in dissociating hydrate reservoirs. The multi-layer model provides better control over reservoir heterogeneity and interface conditions compared to existing homogeneous models.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 32 no. 2
Type: Research Article
ISSN: 0961-5539

Keywords

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Book part
Publication date: 20 January 2025

Anupama Vohra and Jasbir Singh

Jammu and Kashmir known for its scenic beauty, serene environment and bountifulness has been a witness to turbulent events starting from 1989, when the simmering volcano of…

Abstract

Jammu and Kashmir known for its scenic beauty, serene environment and bountifulness has been a witness to turbulent events starting from 1989, when the simmering volcano of infused hatred from across the border against India, and discriminatory practices of the politicians resulted in mistrust; and the demand for azadi (independence) was made through Kalashnikovs, grenades and bombs, kidnappings, mass demonstrations and other means of groundbreaking violence. To declare Kashmir an Islamic state, the militants spread fear amongst Kashmiri Pandits (KPs), the original Hindu inhabitants of Kashmir, through newspaper advertisements and pamphlets ordering them to leave Kashmir or face death. KPs initially resisted exodus. They looked for every possible way to avoid abandoning the place where their families had roots and their ancestors were consigned to flame. The present research paper will examine Rahul Pandita's narrative Our Moon Has Blood Clots to underscore the violence of KPs being thrown out of their homes, dangling between the status of ‘migrant KP’, ‘refugee KP’, ‘displaced KP’ to ‘reckon with the loss and gain of place, we (may) discover through the force of interpretation, forms of absence – of pain, of fear, of guilt, of desire’ (Kapur 47) to highlight the psyche of KPs in terms of resistance and survival, trauma and victimhood, struggle and survival.

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Article
Publication date: 18 July 2024

Reshmi Lahiri-Roy, Achinto Roy, Rahul Karnik and Sandesh Likhite

This paper is based on the personal connections of the four authors to Shivaji Park, the largest public space in Mumbai. Three of the authors are childhood friends and were once…

30

Abstract

Purpose

This paper is based on the personal connections of the four authors to Shivaji Park, the largest public space in Mumbai. Three of the authors are childhood friends and were once long-term residents of that area. The focus of this article is Shivaji Park, anecdotally the largest park in the island city of Mumbai, with its historical connotations and its ongoing role as a relational and cultural artefact in the lives of these authors. The ongoing member status of all four authors in connection with the public space is explored despite all of them now ceasing to be locals.

Design/methodology/approach

This article uses a qualitative approach utilising informal conversations between the four authors recorded on zoom as the research method. Supported by belonging and emotional reflexivity as conceptual frames, it investigates how the spatial context fosters a binding relationality, which is ongoing despite the now disparate locations of the authors.

Findings

Based on a critical analysis of the recorded conversations between the authors the findings highlight that belonging/unbelonging centres around emotionally tinged representations of place.

Originality/value

The core of this paper rests in the emotional connections between the authors based on their collective memories with a public space and its surrounding areas as a focus. The use of informal conversations is crucial in teasing out nuanced aspects of data collected based on human relationalities. The paper emphasises the repercussions of ongoing changes stemming from urban progress. They incur emotional and human costs through a “culling” of connections and belongings.

Details

Qualitative Research Journal, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1443-9883

Keywords

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