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Article
Publication date: 9 June 2022

Afaq Ahmad, Zahoor Ahmad, Abdullah Ullah, Naveed Ur Ur Rehman, Muhammad Israr, Muhammad Zia, Haider Ali and Ataur Rahman

This study aims to investigate and compare the characteristics of three topologies of moving-magnet linear oscillating actuator (LOA) based on their mover position. Positive…

68

Abstract

Purpose

This study aims to investigate and compare the characteristics of three topologies of moving-magnet linear oscillating actuator (LOA) based on their mover position. Positive aspects and consequences of every topology are demonstrated. Three topologies of axially magnetized moving-magnet LOA; outer mover, inner mover (IM) and dual stator (DS) are designed and examined. Due to its characteristically high thrust density and more mechanical strength, axially magnetized tubular permanent magnets (PMs) are used in these topologies.

Design/methodology/approach

LOAs are designed and optimized using parametric sweep, in term of design parameters and output parameters like thrust force, stroke and operating resonance frequency of the LOA. All the pros and cons of each topology are investigated and compared. Output parameters of the LOAs are compared using same size of the investigated LOAs. Mover mass, which plays a vital role in resonant operation, is analyzed for IM and DS designs. Investigated LOAs are compared with conventional designs of LOA for compressor in refrigeration system with regards of motor constant, stroke and thrust per PM mass.

Findings

This paper analyzes three topologies of moving-magnet LOAs. The basic difference between investigated LOAs is the radius of tubular-shaped mover from its central axis. All the design parameters are compared and concluded that thrust per PM mass of IMLOA is maximum. OMLOA provides maximum motor constant of value 180 N/A. DSLOA provides thrust force with motor constant 120 N/A and required intermediate materials of PMs. All the three designs give the best results in terms of motor constant and thrust per PM mass, compared to conventional designs of LOA.

Originality/value

This paper determines the impact of mover position from its central axis in a tubular-shaped moving-magnet LOA. This work is carried out in correspondence of latest papers of LOA.

Details

World Journal of Engineering, vol. 20 no. 6
Type: Research Article
ISSN: 1708-5284

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Article
Publication date: 8 July 2022

Mehtab Khan, Adnan Daud Khan, Muhammad Jawad, Zahoor Ahmad, Naveed Ur Rehman and Muhammad Israr

This paper aims to investigates a novel design of a modular moving magnet linear oscillating actuator (MMM-LOA) with the capability of coupling modules, based on their application…

73

Abstract

Purpose

This paper aims to investigates a novel design of a modular moving magnet linear oscillating actuator (MMM-LOA) with the capability of coupling modules, based on their application and space requirements.

Design/methodology/approach

Proposed design comprised of modules, and modules are separated by using nonmagnetic materials. Movable part of the proposed design of LOA is composed of permanent magnets (PMs) having axial magnetization direction and tubular structure. Stator of the proposed design is composed of one coil individually in a module. Dimensions of the design parameters are optimized through parametric analysis using COMSOL Multi Physics software. This design is analyzed up to three modules and their response in term of electromagnetic (EM) force and stroke are presented. Influence of adding modules is analyzed for both directions of direct current (DC) and alternating input loadings.

Findings

Proposed LOA shows linear increase in magnitude of EM force by adding modules. Motor constant of the investigated LOA is 264 N/A and EM force per PM mass is 452.389 N/kg, that shows significant improvement. Moreover, proposed LOA operates in feasible region of stroke for compressor application. Furthermore, this design uses axially magnetized PMs which are low cost and available in compact tubular structure.

Originality/value

Proposed LOA shows the influence of adding modules and its effect in term of EM force is analyzed for DC and alternating current (AC). Moreover, overall performance and structural topology is compared with state-of-the-art designs of LOA. Improvement with regard of motor constant and EM force per PM mass shows originality and scope of this paper.

Details

World Journal of Engineering, vol. 20 no. 6
Type: Research Article
ISSN: 1708-5284

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Article
Publication date: 5 March 2018

Asif Yaseen, Muhamamd Abid Saleem, Sadaf Zahra and Muhammad Israr

Promoting entrepreneurship within agri-food sectors in developing countries can be a viable strategy towards economic development. Predicting which factors will foster…

622

Abstract

Purpose

Promoting entrepreneurship within agri-food sectors in developing countries can be a viable strategy towards economic development. Predicting which factors will foster entrepreneurial behaviour is somewhat complex. Specifically, a deeper understanding of precursory effects on entrepreneurial behaviour is required to enhance entrepreneurship in the agri-food sectors. This paper aims to explore what predicts the entrepreneurial decisions in the dairy industry of Pakistan.

Design/methodology/approach

The research used an integrative framework built on the entrepreneurial event model and determinants of entrepreneurial intention. Using a partial least square approach to structural equation model estimation, this study tested a conceptual model and its hypotheses based on 174 cases sampled from Pakistan’s dairy industry.

Findings

The research showed that intention is a strong predictor to start entrepreneurial activities in the Pakistani dairy industry. Amongst precursory factors, perceived feasibility, readiness and conviction were found strongly linked to intention when explaining the causes of entrepreneurial start-ups. Surprisingly, the impact of attitude and triggering event was not significant in explaining the phenomenon under investigation.

Practical implications

The findings suggest that training and education programmes can enhance critical perceptions such as desirability, feasibility and conviction among farmers to become entrepreneur. For this purpose, government should establish dairy incubation centres in different cities and transform agricultural extension department to help farmers understand market-oriented dairy farming businesses and build their capacity in farm entrepreneurship.

Originality/value

This research attempted to shed light on fostering entrepreneurship in the context of agri-food sectors in developing countries such as Pakistan’s dairy industry.

Details

Journal of Entrepreneurship in Emerging Economies, vol. 10 no. 1
Type: Research Article
ISSN: 2053-4604

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Article
Publication date: 25 June 2019

Muhammad Aamir, Majid Tolouei-Rad, Israr Ud Din, Khaled Giasin and Ana Vafadar

Tin-Silver-Copper is widely accepted as the best alternative to replace Tin-Lead solders in microelectronics packaging due to their acceptable properties. However, to overcome…

284

Abstract

Purpose

Tin-Silver-Copper is widely accepted as the best alternative to replace Tin-Lead solders in microelectronics packaging due to their acceptable properties. However, to overcome some of the shortcomings related to its microstructure and in turn, its mechanical properties at high temperature, the addition of different elements into Tin-Silver-Copper is important for investigations. The purpose of this paper is to analyse the effect of lanthanum doping on the microstructure, microhardness and tensile properties of Tin-Silver-Copper as a function of thermal aging time for 60, 120 and 180 h at a high temperature of 150°C and at high strain rates of 25, 35 and 45/s.

Design/methodology/approach

The microstructure of un-doped and Lanthanum-doped Tin-Silver-Copper after different thermal aging time is examined using scanning electron microscopy followed by digital image analyses using ImageJ. Brinell hardness is used to find out the microhardness properties. The tensile tests are performed using the universal testing machine. All the investigations are done after the above selected thermal aging time at high temperature. The tensile tests of the thermally aged specimens are further investigated at high strain rates of 25, 35 and 45/s.

Findings

According to the microstructural examination, Tin-Silver-Copper with 0.4 Wt.% Lanthanum is found to be more sensitive at high temperature as the aging time increases which resulted in coarse microstructure due to the non-uniform distribution of intermetallic compounds. Similarly, lower values of microhardness, yield strength and ultimate tensile strength come in favours of 0.4 Wt.% Lanthanum added Tin-Silver-Copper. Furthermore, when the thermally aged tensile specimen is tested at high strains, two trends in tensile curves of both the solder alloys are noted. The trends showed that yield strength and ultimate tensile strength increase as the strain rate increase and decrease when there is an increase in thermal aging.

Originality/value

The addition of higher supplement (0.4 Wt.%) of Lanthanum into Tin-Silver-Copper showed a lower hardness value, yield strength, ultimate tensile strength, ductility, toughness and fatigue in comparison to un-doped Tin-Silver-Copper at high temperature and at high strain rates. Finally, simplified material property models with minimum error are developed which will help when the actual test data are not available.

Details

Soldering & Surface Mount Technology, vol. 31 no. 4
Type: Research Article
ISSN: 0954-0911

Keywords

Available. Open Access. Open Access
Article
Publication date: 19 June 2019

Gideon Nkurunziza, John Munene, Joseph Ntayi and Will Kaberuka

The purpose of this paper is to study the relationship between organizational adaptability, institutional leadership and business process reengineering performance using the…

6358

Abstract

Purpose

The purpose of this paper is to study the relationship between organizational adaptability, institutional leadership and business process reengineering performance using the tested complexity theory in a developing economy setting.

Design/methodology/approach

This study is correlation and cross-sectional and adopts institutional-level data collected via questionnaires from reengineered microfinance institutions in Uganda. Cluster analysis as data mining technique was used to classify cases based on respondents’ opinions into homogeneous clusters. Nvivo was used to understand the perceptions of business process reengineering performance based on qualitative data. The authors used structural equation modeling to derive the predictive model of business process reengineering performance in a developing world setting.

Findings

The authors find that organizational adaptability and institutional leadership are key predictors of business process reengineering performance. Results reveal a predictive model of 61 per cent based on structural equation modeling for the study variables. Cluster analysis as data mining approach explored complex patterns of reengineered business processes.

Research limitations/implications

The use of cluster analysis is susceptible to problems associated with sampling error and absence of fit indices. However, the likelihood of these problems is reduced by the interaction with the data, practical implications and use of smart partial least square to generate structural equations based on derived measurement models of each study variable.

Practical implications

Policymakers of Bank of Uganda, Ministry of Finance and Economic Planning, should develop sound policies in relation to knowledge management, institutional leadership and adaptive mechanisms to enhance business process reengineering performance to take advantage of new knowledge opportunities for the improvement of their businesses.

Social implications

Given the results from structural equations generated, managers need to consider institutional leadership and organizational adaptability as key drivers of business process reengineering performance in microfinance institutions. The results confirm the significant role of institutional leadership, organizational adaptability in determining business process reengineering performance outcomes.

Originality/value

Unlike most of the business process reengineering literature, this study contributes to literature by domesticating and testing complexity theory to explain business process reengineering performance in developing economies.

Details

Innovation & Management Review, vol. 16 no. 2
Type: Research Article
ISSN: 2515-8961

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Article
Publication date: 12 November 2021

Israr Ahmad, Yongqiang Gao, Fangguo Su and Muhammad Kamran Khan

This study examines the link between ethical leadership and innovative work behavior. Also, drawing on the substitute for leadership theory, this study investigates the role of a…

1803

Abstract

Purpose

This study examines the link between ethical leadership and innovative work behavior. Also, drawing on the substitute for leadership theory, this study investigates the role of a follower's proactive personality in the relationship between ethical leadership and innovative work behavior (IWB). Similarly, this study further explores the role of psychological safety in this relationship.

Design/methodology/approach

The data for this study were collected from software development companies based in Islamabad, Pakistan. A total of 240 employees and their immediate supervisors were asked to participate in this study. Processes Macro and Amos were used to assess study hypotheses.

Findings

Using data from software companies in Pakistan, this study found that ethical leadership can be effective to enhance IWB in followers whose proactive personality is low, while this effect is limited in high proactive individuals. Furthermore, psychological safety mediates the main effect of ethical leadership on IWB as well as the interactive effect between ethical leadership and follower's proactive personality on IWB.

Originality/value

This study is among the first to investigate the moderating role of employees' proactive personality in the relationship between ethical leadership and followers' IWB. Secondly, draws on the substitute for leadership perspective, this study explains that how the role of ethical leadership can be less effective for high proactive individuals or how individual characteristics can substitute leadership behavior. Thirdly, this study deepens our understanding of the mechanisms linking ethical leadership to IWB by exploring the role of psychological safety as a mediator. Finally, our research is based on data collected from Pakistan might also add some new insights to the existing west-dominated literature.

Details

European Journal of Innovation Management, vol. 26 no. 3
Type: Research Article
ISSN: 1460-1060

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Book part
Publication date: 25 October 2024

Muhammad Faisal Sultan, Israr Ahmed Jatoi and Kashif Riaz

This study is one of the premier ones that is written to highlight the significance of corporate governance for small and medium-sized enterprises (SMEs). The purpose of writing…

Abstract

This study is one of the premier ones that is written to highlight the significance of corporate governance for small and medium-sized enterprises (SMEs). The purpose of writing this chapter is to increase knowledge and understanding of SMEs and their management. Thus, the scope of this study is much broader as compared to the previous studies. Other than scope, this chapter also bridges the research gaps and tries to relate literature with shortcomings and relatively unexplored areas associated with SMEs and their governance. For these reasons elements, claims, reasons and pieces of evidence were collected from diverse literature and presented in a scholarly way to address readers' interest and provide scope for further studies and research. Overall, this chapter is a form of descriptive study which his purposively conducted to induce more research work on corporate governance practices and their significance for SMEs.

Available. Content available
Book part
Publication date: 25 October 2024

Free Access. Free Access

Abstract

Details

Strategic Financial Management
Type: Book
ISBN: 978-1-83608-106-7

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Article
Publication date: 25 June 2024

Abdul Rauf, Norhilmi Muhammad, Hamid Mahmood and Muhammad Aftab

The primary objective of this study is to conduct a comprehensive literature review focused on the concept of service quality within the healthcare sector. This research aims to…

308

Abstract

Purpose

The primary objective of this study is to conduct a comprehensive literature review focused on the concept of service quality within the healthcare sector. This research aims to categorize and analyze the various dimensions associated with service quality.

Design/methodology/approach

The systematic literature review methodology was employed to accomplish current study goals, and specific criteria were utilized to select relevant research articles spanning the years from 2000 to 2023. Ultimately, 57 articles met the criteria and were included in the study.

Findings

Through a meticulous review of selected articles, our research identified and categorized 29 distinct measures for evaluating service quality in the healthcare sector. These measures were further grouped into five overarching categories, namely: overall service quality, personal characteristics, healthcare facility administration, patient attributes and the servicescape. Our investigation highlighted that the dimensions commonly utilized to assess service quality in healthcare primarily draw from the SERVQUAL framework. Additionally, there is significant emphasis on measurements related to the physical environment's quality, overall patient satisfaction and behavioral intention.

Originality/value

This review offers original value by synthesizing diverse literature on healthcare service quality, highlighting SEVQUAL dimensions and critical variables used for assessment. It provides insight into the subjective nature of service quality and varied sampling methods and contributes to enhancing service quality and patient satisfaction in healthcare settings.

Details

International Journal of Quality & Reliability Management, vol. 42 no. 3
Type: Research Article
ISSN: 0265-671X

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Article
Publication date: 1 February 1989

Magda El‐Sherbini

The conflict between Iran and Iraq is not new; it dates from long before September 1980. In fact, the origins of the current war can be traced to the battle of Qadisiyah in…

196

Abstract

The conflict between Iran and Iraq is not new; it dates from long before September 1980. In fact, the origins of the current war can be traced to the battle of Qadisiyah in Southern Iraq in 637 A.D., a battle in which the Arab armies of General Sa'd ibn Abi Waqqas decisively defeated the Persian army. In victory, the Arab armies extended Islam east of the Zagros Mountains to Iran. In defeat, the Persian Empire began a steady decline that lasted until the sixteenth century. However, since the beginning of that century, Persia has occupied Iraq three times: 1508–1514, 1529–1543, and 1623–1638. Boundary disputes, specifically over the Shatt al‐Arab Waterway, and old enmities caused the wars. In 1735, belligerent Iranian naval forces entered the Shatt al‐Arab but subsequently withdrew. Twenty years later, Iranians occupied the city of Sulimaniah and threatened to occupy the neighboring countries of Bahrain and Kuwait. In 1847, Iran dominated the eastern bank of the Shatt al‐Arab and occupied Mohamarah in Iraq.

Details

Reference Services Review, vol. 17 no. 2
Type: Research Article
ISSN: 0090-7324

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