Search results

1 – 10 of 119
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 25 April 2022

Suhail Ahmed Manroo, Noor Zaman Khan, Babar Ahmad and Vinayak Malik

Altering the microstructure and developing the surface metal matrix composites (MMCs) in a solid-state by friction stir processing (FSP) has been on trend for the past decade. The…

110

Abstract

Purpose

Altering the microstructure and developing the surface metal matrix composites (MMCs) in a solid-state by friction stir processing (FSP) has been on trend for the past decade. The microstructural modification increases the material properties, which are structure sensitive. The microstructural evolution is highly influenced by the selection of process parameters in FSP. In this study, the effect of process parameters on the microstructure evolution and microhardness of the fabrication of surface MMCs of newly commercialized Mg-ZE41 alloy by the incorporation of different reinforcement particles such as ZrO2, CeO2 and Al2O3 is investigated.

Design/methodology/approach

By making use of Taguchi’s design of experimentation, which recognizes the crucial factors and ascertain their effect on the properties of the material, the optimization of process parameters for this study was done using MATLAB-14 software. The parameters were adopted along with the levels throughout the FSP for the fabrication of different surface MMCs. For each reinforcement particle, two factors at three levels each had L9 factorial design were used to analyse the effect of these factors on the processing result (microstructure, grain refinement and hardness). The two different factors used in this study are tool rotational speed (TRS) and tool traverse speed (TTS) as a part of the full factorial design matrix for different surface MMCs.

Findings

Among all combinations, TRS of 1500 rpm and TTS of 20 mm/min. for ZE41-ZrO2 MMCs and ZE41-CeO2 MMCs were observed as optimum to produce defect-free processed zone along with the high level of grain refinement and hardness, whereas for ZE41-Al2O3 the same was obtained at 1500 rpm TRS and 10 mm/min TTS.

Originality/value

In this paper, the role of process parameters in the development of surface MMCs on newly commercialized Mg-ZE41 alloy by FSP is investigated. The effect of TRS and TTS on microstructure evolution, grain refinement and microhardness is analysed. Hence, in this study, the optimum parameters for the fabrication of surface MMCs of Mg-ZE41 alloy have thus been established.

Details

World Journal of Engineering, vol. 20 no. 5
Type: Research Article
ISSN: 1708-5284

Keywords

Access Restricted. View access options
Article
Publication date: 28 December 2021

Omar Hussain, Shahid Saleem Sheikh and Babar Ahmad

This study aims to fabricate and investigate the tribological performance of ultra-high molecular weight polyethylene (UHMWPE)-based composite materials reinforced with 0.5, 1 and…

150

Abstract

Purpose

This study aims to fabricate and investigate the tribological performance of ultra-high molecular weight polyethylene (UHMWPE)-based composite materials reinforced with 0.5, 1 and 2 weight percentage of graphene nanoplatelets (GNPs) while keeping the weight percentage of vitamin C constant at 2% for each composite.

Design/methodology/approach

In this paper, the composites were fabricated using hot pressing, and the dispersion of GNP/vitamin C/UHMWPE hybrid composite was investigated by X-ray diffraction. Experimental trials were performed according to ASTM F732 on a reciprocating sliding tribometer (pin-on-disc) at human body temperature of 37 ± 1 °C, for a load of 52 N, to assess the role of these fillers on the tribological properties of UHMWPE against Ti6Al4V counter body material under dry and lubricating (human serum) environment.

Findings

In this study, it has been observed that friction and wear behavior of the developed composites improve with increase in weight percentage of GNP, and human serum adheres to the surface of the composite pins upon sliding, resulting in the formation of a film, which results in better wear resistance of the composite pins under human serum lubrication than dry sliding. Scanning electron microscope was used to investigate the worn surface morphological examination of the composite materials. Specific wear rate of 0.76 × 10−7 mm3/Nm was attained for 2 Wt.% GNP-filled composite under human serum lubrication.

Practical implications

The results indicate the compatibility of the composite material used in this study and suggested the in vitro implant application.

Originality/value

The presented work includes novel study of synergistic effect of GNP (which acts as a solid lubricant) and vitamin C (added as an antioxidant) on the tribological performance of UHMWPE under dry and human serum lubrication.

Details

Industrial Lubrication and Tribology, vol. 74 no. 8
Type: Research Article
ISSN: 0036-8792

Keywords

Access Restricted. View access options
Article
Publication date: 19 August 2021

Nadia Hanif, Jianfeng Wu and Ahmad Bilal Babar

The primary purpose of this study is to explore the impact of acquired ownership in Chinese target firm on the innovation performance of developed economies (DE) acquiring firms…

492

Abstract

Purpose

The primary purpose of this study is to explore the impact of acquired ownership in Chinese target firm on the innovation performance of developed economies (DE) acquiring firms. Furthermore, the study aims to empirically investigate the moderating influence of institutional distance between two parties’ home countries.

Design/methodology/approach

For the empirical investigation of the hypotheses, the authors identified cross-border technological acquisitions from the Securities Data Company between 1995 and 2015. A hierarchical negative binomial regression technique was used to analyze 177 technological acquisitions completed by DE acquiring firms in China.

Findings

Analysis of technological acquisition deals confirmed that acquired ownership undertaken in the Chinese target firms increases the DE acquiring firms’ post-acquisition innovation performance. The authors found that DE acquiring firms underperform in innovation in institutionally distant host countries.

Originality/value

This study contributes to the international business literature by explaining the importance of acquired ownership undertaken in the Chinese target firms for the DE acquiring firm’s innovation performance. Second, institutional theory defines how institutional uncertainty in terms of distance modifies the positive impact of acquired ownership on acquiring firm’s innovation performance.

Details

Chinese Management Studies, vol. 16 no. 5
Type: Research Article
ISSN: 1750-614X

Keywords

Access Restricted. View access options
Article
Publication date: 18 September 2024

Muhammad Rehan, Jahanzaib Alvi and Umair Lakhani

The primary purpose of this research is to identify and compare the multifractal behavior of different sectors during these crises and analyze their implications on market…

113

Abstract

Purpose

The primary purpose of this research is to identify and compare the multifractal behavior of different sectors during these crises and analyze their implications on market efficiency.

Design/methodology/approach

We used multifractal detrended fluctuation analysis (MF-DFA) to analyze stock returns from various sectors of the Moscow Stock Exchange (MOEX) in between two significant periods. The COVID-19 pandemic (January 1, 2020, to December 31, 2021) and the Russia–Ukraine conflict (RUC) (January 1, 2022, to June 30, 2023). This method witnesses multifractality in financial time series data and tests the persistency and efficiency levels of each sector to provide meaningful insights.

Findings

Results showcased persistent multifractal behavior across all sectors in between the COVID-19 pandemic and the RUC, spotting heightened arbitrage opportunities in the MOEX. The pandemic reported a greater speculative behavior, with the telecommunication and oil and gas sectors exhibiting reduced efficiency, recommending abnormal return potential. In contrast, financials and metals and mining sectors displayed increased efficiency, witnessing strong economic performance. Findings may enhance understanding of market dynamics during crises and provide strategic insights for the MOEX’s investors.

Practical implications

Understanding the multifractal properties and efficiency of different sectors during crisis periods is of paramount importance for investors and policymakers. The identified arbitrage opportunities and efficiency variations can aid investors in optimizing their investment strategies during such critical market conditions. Policymakers can also leverage these insights to implement measures that bolster economic stability and development during crisis periods.

Originality/value

This research contributes to the existing body of knowledge by providing a comprehensive analysis of multifractal properties and efficiency in the context of the MOEX during two major crises. The application of MF-DFA to sectoral stock returns during these events adds originality to the study. The findings offer valuable implications for practitioners, researchers and policymakers seeking to navigate financial markets during turbulent times and enhance overall market resilience.

Details

International Journal of Emerging Markets, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1746-8809

Keywords

Access Restricted. View access options
Article
Publication date: 1 August 2023

Mehmet Bahadır Kalıpçı

This paper aims to create a conceptual model that connects learning organizations, service innovation and technology acceptance.

394

Abstract

Purpose

This paper aims to create a conceptual model that connects learning organizations, service innovation and technology acceptance.

Design/methodology/approach

The importance of the interaction of variables benefiting both individuals and organizations has been comprehensively explained by combining two well-known theories – learning organizational theory and service innovation theory – with the technology acceptance model. In the first part of the study, conceptual model has been constructed and then applied to the hospitality industry of which results have been presented in the second part of this paper.

Findings

It is hypothesized that learning organization, service innovation and technology acceptance have significant relationships. It is also suggested that the learning organization plays an intermediary role in the relationship between technology acceptance and service innovation. Empirical results in this regard have been presented in the second part of the paper.

Research limitations/implications

The relations have been established and tested in the hospitality industry in Antalya. However, the model can be applied and established relations tested in other industries.

Originality/value

This research contributes to our knowledge of the intricate linkages that exist between learning organizations, technology acceptance and service innovation. Originality of the paper is related to the novel multilayered model illustrating three-way interactions between the three dimensions of learning organization, technology acceptance and service innovation.

Details

The Learning Organization, vol. 30 no. 6
Type: Research Article
ISSN: 0969-6474

Keywords

Access Restricted. View access options
Article
Publication date: 17 April 2024

Prince Kumar Maurya, Rohit Bansal and Anand Kumar Mishra

This paper aims to investigate the dynamic volatility connectedness among 13 G20 countries by using the volatility indices.

162

Abstract

Purpose

This paper aims to investigate the dynamic volatility connectedness among 13 G20 countries by using the volatility indices.

Design/methodology/approach

The connectedness approach based on the time-varying parameter vector autoregression model has been used to investigate the linkage. The period of study is from 1 January 2014 to 20 April 2023.

Findings

This analysis revealed that volatility connectedness among the countries during COVID-19 and Russia–Ukraine conflict had increased significantly. Furthermore, analysis has indicated that investors had not anticipated the World Health Organization announcement of COVID-19 as a global pandemic. Contrarily, investors had anticipated the Russian invasion of Ukraine, evident in a significant rise in volatility before and after the invasion. In addition, the transmission of volatility is from developed to developing countries. Developed countries are NET volatility transmitters, whereas developing countries are NET volatility receivers. Finally, the ordinary least square regression result suggests that the volatility connectedness index is informative of stock market dynamics.

Originality/value

The connectedness approach has been widely used to estimate the dynamic connectedness among market indices, cryptocurrencies, sectoral indices, enegy commodities and metals. To the best of the authors’ knowledge, none of the previous studies have directly used the volatility indices to measure the volatility connectedness. Hence, this study is the first of its kind that has used volatility indices to measure the volatility connectedness among the countries.

Details

Studies in Economics and Finance, vol. 41 no. 5
Type: Research Article
ISSN: 1086-7376

Keywords

Access Restricted. View access options
Article
Publication date: 7 December 2021

Kalyan Sagar Kadali, Moorthy Veeraswamy, Marimuthu Ponnusamy and Viswanatha Rao Jawalkar

The purpose of this paper is to focus on the cost-effective and environmentally sustainable operation of thermal power systems to allocate optimum active power generation…

54

Abstract

Purpose

The purpose of this paper is to focus on the cost-effective and environmentally sustainable operation of thermal power systems to allocate optimum active power generation resultant for a feasible solution in diverse load patterns using the grey wolf optimization (GWO) algorithm.

Design/methodology/approach

The economic dispatch problem is formulated as a bi-objective optimization subjected to several operational and practical constraints. A normalized price penalty factor approach is used to convert these objectives into a single one. The GWO algorithm is adopted as an optimization tool in which the exploration and exploitation process in search space is carried through encircling, hunting and attacking.

Findings

A linear interpolated price penalty model is developed based on simple analytical geometry equations that perfectly blend two non-commensurable objectives. The desired GWO algorithm reports a new optimum thermal generation schedule for a feasible solution for different operational strategies. These are better than the earlier reports regarding solution quality.

Practical implications

The proposed method seems to be a promising optimization tool for the utilities, thereby modifying their operating strategies to generate electricity at minimum energy cost and pollution levels. Thus, a strategic balance is derived among economic development, energy cost and environmental sustainability.

Originality/value

A single optimization tool is used in both quadratic and non-convex cost characteristics thermal modal. The GWO algorithm has discovered the best, cost-effective and environmentally sustainable generation dispatch.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 41 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

Access Restricted. View access options
Article
Publication date: 29 September 2022

Maria Babar, Habib Ahmad and Imran Yousaf

This study examines the information transmission (return and volatility spillovers) among energy commodities (crude oil, natural gas, Brent oil, heating oil, gasoil, gasoline) and…

216

Abstract

Purpose

This study examines the information transmission (return and volatility spillovers) among energy commodities (crude oil, natural gas, Brent oil, heating oil, gasoil, gasoline) and Asian stock markets which are net importers of energy (China, India, Indonesia, Malaysia, Korea, Pakistan, Philippines, Taiwan, Thailand).

Design/methodology/approach

The information transmission is investigated by employing the spillover index of Diebold and Yilmaz, using daily data for the period January 2000 to May 2021.

Findings

A Strong connectedness is documented between the two classes of asset, especially during crisis periods. Our findings reveal that most of the energy markets, except gasoil and natural gas, are net transmitters of information, whereas all the stock markets, excluding Indonesia and Korea, are net recipients.

Practical implications

The findings are helpful for portfolio managers and institutional investors allocating funds to various asset classes in times of crisis.

Originality/value

All data is original.

Details

Asia-Pacific Journal of Business Administration, vol. 16 no. 2
Type: Research Article
ISSN: 1757-4323

Keywords

Access Restricted. View access options
Article
Publication date: 12 December 2018

Muhammad Babar Ramzan, Abher Rasheed, Zulfiqar Ali, Sheraz Ahmad, Muhammad Salman Naeem and Ali Afzal

In the field of knitwear, dimensional stability is assumed as a critical problem that affects the quality and salability of a product. Although much work has been done in this…

208

Abstract

Purpose

In the field of knitwear, dimensional stability is assumed as a critical problem that affects the quality and salability of a product. Although much work has been done in this area with a focus on the factors affecting fabric shrinkage, however, there is a lack of work on knitwears with respect to their dimensional stability. The purpose of this paper is to investigate the impact of stitching parameters and wash types on the dimensional properties of knitwear.

Design/methodology/approach

The crew-neck t-shirts were prepared by using pique knitted fabrics. Different sewing and finishing parameters were used that include stitch density, stitch type, stitching thread and wash type. The critical measurements of the selected garment are taken as output variables which are body width, sleeve length, body length and across shoulder. After laundering process, shrinkage percentage was calculated by using before-wash and after-wash measurements.

Findings

This study shows that the stitching parameters affect significantly on knitwear’s shrinkage. Thus, when patterns are being developed for the cutting of fabric, expected shrinkage, known as residual shrinkage, must be considered to avoid unexpected changes in garment shape.

Originality/value

This research will be useful for knitwear manufacturing industry.

Details

International Journal of Clothing Science and Technology, vol. 31 no. 2
Type: Research Article
ISSN: 0955-6222

Keywords

Access Restricted. View access options
Article
Publication date: 11 December 2024

Viet An Tran, Que Nhi Tran, Ha My Doan, Gia Long La, Tien Duc Vu and Thi Huyen Pham

This article aims to assess the impact of factors affecting the senses (via Sensory Marketing theory) on customer perceived quality and satisfaction when using health services in…

68

Abstract

Purpose

This article aims to assess the impact of factors affecting the senses (via Sensory Marketing theory) on customer perceived quality and satisfaction when using health services in public hospitals. Based on the results, the research proposes solutions for public hospitals to improve the service experience to increase customer satisfaction in Vietnam generally and in developing countries particularly.

Design/methodology/approach

The authors used 619 respondents’ non-convenient probability sampling method, focusing on objects experienced with public hospital services in Vietnam. A preliminary quantitative study (n = 113) and qualitative research (n = 20) have been conducted to finalise the designed questionnaire before conducting a formal quantitative survey. Cronbach Alpha, CFA and SEM have been used to explore the meanings of the data collected.

Findings

The result showed that through Sensory Marketing, sensorial stimulus (tactile, sight, smell and taste) significantly impacts customer satisfaction with medical services at the public hospital. Research findings are the premise to conclude that the application of the Sensory Marketing model creates a great sensory experience, and minimises negative psychological feelings in the medical, especially in a prioritised personalisation society.

Practical implications

The authors open up a new health service quality and satisfaction assessment tool based on the original human senses that were previously applied in researching other services, it has been proven to be successfully applied to specific service areas such as healthcare. This research is believed to provide valuable implications for medical service stakeholders and policymakers to improve service quality and enhance the customer experience and satisfaction level through sensorial approaches, strategies and tactics.

Originality/value

While most studies on customer satisfaction in the medical field use SERVQUAL, SERVPERF or KQCAH model, this study breaks the research gap by not only affirming and strengthening the research perspective on Sensory Marketing but also contributing to creating a solid theoretical framework on perceived service quality and satisfaction.

Details

Journal of Health Organization and Management, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1477-7266

Keywords

1 – 10 of 119
Per page
102050