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Article
Publication date: 3 August 2010

Abhijit Ghosh and S.K. Majumdar

The purpose of this paper is to model the occurrences of successive failure types and times to failure of the two repairable machine systems.

Abstract

Purpose

The purpose of this paper is to model the occurrences of successive failure types and times to failure of the two repairable machine systems.

Design/methodology/approach

Historical data on failure types and time to failures of the given machine systems (4 nos) were gainfully used. Second order time homogeneous Markov Chain models were used to characterize the occurrences of the two broad failure type, namely, mechanical and electrical, after having found that the occurrences of failure types were dependent. Second order time homogeneous Markov Chain with Bivariate Distribution function (M2BVD) was used to model the times between successive failures {Tn, n≥1} for each machine system.

Findings

It is possible to apply the theoretical framework of Markov chain models to the accumulated data on failure types and failure times of any repairable system, which provide a wealth of information on the systems and are often left unused.

Research limitations/implications

The framework used in the study can be improved to accommodate multiple failure types and failure times of any repairable system to the extent that a more accurate prediction of these two variables and a better estimate of the system reliability are available.

Originality/value

The models for failure types and failure times of the given machine systems would be of immense use to the maintenance crew for predicting the future failure types and failure times of any given system and subsequently organizing and fine‐tuning their state of preparedness.

Details

International Journal of Quality & Reliability Management, vol. 27 no. 7
Type: Research Article
ISSN: 0265-671X

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Article
Publication date: 1 August 2004

Abhijit Ghosh

Although organizational learning occurs through individuals, it would be a mistake to conclude that organizational learning is nothing but the cumulative result of their…

Abstract

Although organizational learning occurs through individuals, it would be a mistake to conclude that organizational learning is nothing but the cumulative result of their members' learning. Organizations do not have brains, but they have cognitive systems and memories. A device cited in this literature as an important tool for organizational learning is the “Strategic Alliance” – an important element of contemporary firms' competitive strategies. This paper attempts to look at the phenomenon of inter‐organizational learning through the socio‐cultural‐historical lens of Vygotsky and hopes to advance a theoretical framework, which is more eclectic and can therefore better explain the dynamics of learning in alliances.

Details

The Learning Organization, vol. 11 no. 4/5
Type: Research Article
ISSN: 0969-6474

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Article
Publication date: 13 March 2019

Md Samsu Alam, Abhijit Majumdar and Anindya Ghosh

Bending and shear rigidities of woven fabrics depend on fibre, yarn and fabric-related parameters. However, there is lack of research efforts to understand how bending and…

Abstract

Purpose

Bending and shear rigidities of woven fabrics depend on fibre, yarn and fabric-related parameters. However, there is lack of research efforts to understand how bending and shear rigidities change in woven fabrics having similar areal density. The purpose of this paper is to investigate the change in bending and shear rigidities in plain woven fabrics having similar areal density.

Design/methodology/approach

A total of 18 fabrics were woven (9 each for 100 per cent cotton and 100 per cent polyester) keeping the areal density same. Yarns of 20, 30 and 40 Ne were used in warp and weft wise directions and fabric sett was adjusted to attain the desired areal density.

Findings

When warp yarns become finer, keeping weft yarns same, bending rigidity remains unchanged but shear rigidity increases in warp wise direction. When weft yarns are made finer, keeping the warp yarns same, both the bending and shear rigidities of fabric increase in warp wise direction. Similar results for fabric bending and shear rigidities were obtained in transpose direction. There is a strong association between fabric shear rigidity and number of interlacement points per unit area of fabric even when fabric areal density is same.

Originality/value

Very limited research has been reported on the low-stress mechanical properties of woven fabrics having similar areal density. A novel attempt has been made in this research work to investigate the bending and shear rigidities of woven fabrics having similar areal density. Besides, it has been shown that it is possible to design a set of woven fabrics having similar bending rigidity but different shear rigidity.

Details

International Journal of Clothing Science and Technology, vol. 31 no. 3
Type: Research Article
ISSN: 0955-6222

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Book part
Publication date: 9 March 2021

Abstract

Details

Global Tariff War: Economic, Political and Social Implications
Type: Book
ISBN: 978-1-80071-314-7

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Article
Publication date: 22 May 2009

Richu Singla, Moushumi Ghosh and Abhijit Ganguli

The purpose of this paper is to evaluate the total polyphenolics, flavonoids and antioxidant properties of a ready to‐eat snack food prepared from Agaricus bisporous. A…

Abstract

Purpose

The purpose of this paper is to evaluate the total polyphenolics, flavonoids and antioxidant properties of a ready to‐eat snack food prepared from Agaricus bisporous. A comparison of these properties with the raw, unprocessed mushroom was also carried out.

Design/methodology/approach

Extracts of raw and snack mushrooms (osmotically dehydrated, dried and spiced and following sensorial analysis) were analyzed for antioxidant activities using DPPH and ABTS radical scavenging methods. Flavonoids were determined by the method of Jia et al. Total polyphenolics (free and bound) were determined by the Folin‐Ciocalteu method; reducing power and hemolysis inhibition of the extracts were determined by the methods of Oyaizu and Zhang et al.

Findings

Scavenging activity of free extracts of raw and dry snack mushrooms on DPPH radical were 76 per cent and 72 per cent respectively. The ABTS radical scavenging activity of the free extracts of raw sample was 2.76 mg ascorbic acid equivalents/100 g and 2.67 mg ascorbic acid equivalents/100 g snack mushroom. Both free and bound polyphenolic contents in mushroom snacks were slightly higher than raw mushrooms, total flavonoids levels decreased marginally in snack mushrooms. Hemolysis inhibition was decreased (marginally) in free extract of snack mushroom as compared to raw mushroom whereas total reducing power of snack mushroom extract increased significantly. The antioxidant status was unaffected following storage of the snack at ambient temperature for up‐to 15 days.

Research limitations/implications

Mushrooms snacks may serve as a good alternative for currently existing snack foods since they retain a significant amount of polyphenolics and antioxidants; mixed with other commonly used snack foods it may provide beneficial health effects to the consumers economically.

Practical implications

A simple, economical process for preparation of Agaricus bisporous snack using sequential application of osmotic dehydration and drying was optimized; the snack mushrooms possessed functional properties comparable to raw, unprocessed mushrooms.

Originality/value

This paper reports for the first time a simple, economical process for preparation of functional snack food from mushrooms.

Details

Nutrition & Food Science, vol. 39 no. 3
Type: Research Article
ISSN: 0034-6659

Keywords

Content available
Book part
Publication date: 8 June 2021

Abstract

Details

Comparative Advantage in the Knowledge Economy
Type: Book
ISBN: 978-1-80071-040-5

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Article
Publication date: 12 January 2021

Abhijit Majumdar and Sanjib Kumar Sinha

It has been long debated whether the three bottom lines of sustainability (economic, environmental and social) can be achieved simultaneously or whether achieving one…

Abstract

Purpose

It has been long debated whether the three bottom lines of sustainability (economic, environmental and social) can be achieved simultaneously or whether achieving one adversely affects the others. This paper analyses the economic sustainability of an environmental initiative, namely, effluent treatment plant (ETP), adopted by an Indian textile industry.

Design/methodology/approach

Two situations have been considered for the analysis. First, pure economic view with the operating and installed capacities has been considered. Second, combined economic-environmental view using shadow prices of undesirable outputs (biological oxygen demand, chemical oxygen demand, total nitrogen, total phosphorous, etc.) has been analysed.

Findings

It has been found that when pure economic view is considered, the net present value (NPV) of the ETP with present operating capacity (10,200 kL/day) is negative, implying that it is not economically sustainable. However, if the ETP is operated with the full installed capacity (17,000 kL/day), it becomes economically sustainable except in the case of very high cost of capital (13%). Finally, when shadow prices of undesirable outputs are considered, the NPV becomes positive, bolstering the economic-environmental sustainability of ETP.

Research limitations/implications

In future, multiple case studies should be conducted in similar organisations to extend the general applicability of the outcome of this study. This research considers the economic and environmental aspects of ETP. However, social benefits have not been considered in this research work, which can definitely be addressed in future endeavours.

Practical implications

Though very high capital investment of ETP acts as a barrier, the results of this study imply that the top management of textile and clothing organisations should look at it from the holistic economic-environmental viewpoint. The use of ETP also leads to social benefits by improving the health of local community and by reducing their hospitalisation, medical expenditure and absenteeism from school and workplace. The outcome of this research may enthuse the entrepreneurs to adopt environmental initiatives.

Originality/value

The paper provides a framework to evaluate the economic feasibility of ETP by considering the time value of money. It is demonstrated with a real case that the environmental initiatives can be economically rewarding.

Details

Benchmarking: An International Journal, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1463-5771

Keywords

Content available
Book part
Publication date: 3 June 2021

Abstract

Details

Productivity Growth in the Manufacturing Sector
Type: Book
ISBN: 978-1-80071-094-8

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Article
Publication date: 28 April 2020

Laima Muraliene and Daiva Mikucioniene

Air permeability has a valuable role in comfort parameters. It is known that air permeability of elastomeric yarns is firmly low. Despite that, usage of elastomeric…

Abstract

Purpose

Air permeability has a valuable role in comfort parameters. It is known that air permeability of elastomeric yarns is firmly low. Despite that, usage of elastomeric inlay-yarns is the most common and the most effective way to generate compression for knitted textile. This study aims to investigate the influence of elastomeric inlay-yarn linear density, insertion density and elongation of the sample to the air permeability of compression knitted materials.

Design/methodology/approach

Two different types of knitting patterns were investigated: rib 1 × 1 pattern with different elastomeric inlay-yarn linear density (four variants) and insertion density (without inlay yarn and with inlay-yarns inserted into every single, second or fourth course) and combined laid-in jacquard pattern. The air permeability test for these structures was performed without any deformation and at 10 and 20 per cent fixed transverse elongation.

Findings

According to the investigation, insertion density of inlay-yarns has a huge impact on air permeability; however, air permeability of knitted material is not linearly proportional to the total amount of inlay-yarns. Also, it was found that air permeability increases by increasing elongation, regardless of knitting pattern and total amount of elastomeric inlay-yarn in the knitted structure. Alteration of the loop geometry at natural state and 20 per cent fixed elongation was established, and the increase of air permeability at fixed elongation may be dependent on changes of knitted material porosity.

Originality/value

According to the obtained results, recommendations to perform air permeability measurement at least with minimal specific wear elongation are presented.

Details

International Journal of Clothing Science and Technology, vol. 32 no. 6
Type: Research Article
ISSN: 0955-6222

Keywords

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Article
Publication date: 21 May 2020

Neharika Sobti

The purpose of this paper is to ascertain the possible consequences of ban on futures trading of agriculture commodities in India by examining three critical issues…

Abstract

Purpose

The purpose of this paper is to ascertain the possible consequences of ban on futures trading of agriculture commodities in India by examining three critical issues: first, the author explores whether price discovery dominance changes between futures and spot in the pre-ban and post-relaunch phase both in the long run and short run. Second, the author examines the impact of ban and relaunch of futures trading on its underlying spot volatility for five sample cases of agriculture commodities (Wheat, Sugar, Soya Refined Oil, Rubber and Chana) using both parametric and non-parametric tests. Third, the author revisits the destabilization hypothesis in the light of ban on futures trading by examining the impact of unexpected component of liquidity of futures on spot volatility.

Design/methodology/approach

The author uses widely adopted methodology of co-integration to examine long-run relationship between spot and futures, while the short-run relationship is investigated using vector error correction model (VECM) and Granger causality to test price discovery in the pre-ban and post-relaunch phases. The second objective is explored using a combination of parametric and non-parametric tests such as Welch one-way ANOVA and Kruskal–Wallis test, respectively, to gauge the impact of ban on futures trading on spot volatility along with post hoc tests to investigate pairwise comparison of spot volatility among three phases (pre-ban, ban and post-relaunch) using Dunn Test. In addition, extensive robustness test is undertaken by adopting augmented E-GARCH model to ascertain the impact of ban and relaunch of futures trading on spot volatility. The third objective is investigated using Granger causality test between spot volatility and unexpected component of liquidity of futures estimated using Hodrick and Prescott (HP) filter to re-visit the destabilization hypothesis.

Findings

The author found extensive evidence for the dominance of futures market in the price discovery of agriculture commodities both in the pre-ban and post-relaunch phases in India. The ban on futures trading is found to have a destabilizing impact on spot volatility as evident from the findings of Wheat, Sugar and Rubber. In addition, it is observed that spot volatility was highest during the ban phase as compared to the pre-ban and post-relaunch phases for all four commodities barring Chana. The author found that destabilisation hypothesis holds true during the pre ban phase, while weakening of destabilization hypothesis is observed in the post-relaunch phase as unexpected futures liquidity has no role in driving the spot volatility.

Originality/value

This study is a novel attempt to empirically examine the potential impact of ban and relaunch of futures trading of agriculture commodities on two key market quality dimensions – price discovery and spot volatility. In addition, destabilization hypothesis is revisited to investigate the impact of futures trading on spot volatility during the pre-ban and post-relaunch period.

Details

South Asian Journal of Business Studies, vol. 9 no. 2
Type: Research Article
ISSN: 2398-628X

Keywords

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