R. Souchet, F. Dalard, J.J. Rameau and M. Reboul
Introduction The competitive complexation of Sn(II) hydroxycomplexes and Sn(II) complexes with organic acids present in fruit juices, has been studied, in a first stage, by the…
Abstract
Introduction The competitive complexation of Sn(II) hydroxycomplexes and Sn(II) complexes with organic acids present in fruit juices, has been studied, in a first stage, by the experimental method of titration. This method allows to compare the complexing power of different organic acids. Applied to tartaric and acetic acids it shows that tartaric acid is more complexing towards tin than acetic acid.
Presents a review on implementing finite element methods on supercomputers, workstations and PCs and gives main trends in hardware and software developments. An appendix included…
Abstract
Presents a review on implementing finite element methods on supercomputers, workstations and PCs and gives main trends in hardware and software developments. An appendix included at the end of the paper presents a bibliography on the subjects retrospectively to 1985 and approximately 1,100 references are listed.
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Anne-Marie Lebrun, Quentin Neveu and Patrick Bouchet
The objective of this research is to understand and compare the perceived brand positioning of two football megabrands (Adidas and Nike) for a specific social group, the…
Abstract
Purpose
The objective of this research is to understand and compare the perceived brand positioning of two football megabrands (Adidas and Nike) for a specific social group, the registered amateur football players in France, using the social representation theory (SRT) as the theoretical framework and the free word associations as the main method.
Design/methodology/approach
A survey was conducted through face-to-face questionnaire among a convenience sample of registered amateur football players in France (n = 362) and for which 52 percent chose Adidas and 48 percent Nike.
Findings
Findings demonstrated that Adidas and Nike have a different perceived brand positioning for the registered amateur football players in France. Adidas is perceived as more typical and positioned “inside the football ground” through main characteristics of its football goods for training and competition. Nike is more positioned “outside the football ground” through their sportswear goods for daily life and fashion.
Originality/value
The interest of this research is to be primarily inductive and focus on a specific group (membership of registered amateur football players) to understand the perceived brand positioning in the football market. The method allows activating the belonging with this group (higher level of practice with these brands) by using the SRT method of free word associations. Thanks to this original approach, results could help managers of Nike and Adidas reinforce their brand positioning and gain market share, as well as build their specific brand community like both megabrands did for the runners in France.
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C. Pandazaras and G. Petropoulos
This paper aims to introduce an innovative methodology for the determination of operational characteristics of journal bearings (j‐bs) through using new type charts based upon a…
Abstract
Purpose
This paper aims to introduce an innovative methodology for the determination of operational characteristics of journal bearings (j‐bs) through using new type charts based upon a numerical solution of the Reynolds equation.
Design/methodology/approach
The present paper proposes the mapping of the behaviour of a smooth, isothermal and hydrodynamic (j‐b) as a first step towards a future representation of the behaviour of j‐b's with limited length and high lubricating clearance with or without macro or micro topographic features operating under high loads, high temperatures and low linear velocities leading to conditions of mixed or boundary lubrication.
Findings
The derived analytical relationships between dimensionless quantities lead to the development of high precision synthetic operational charts regarding sliding j‐b of any given geometry and varying operational characteristics.
Originality/value
By considering the iso‐operational curves which are of a hook form relevant to comparative data becomes directly and rapidly clarified.
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S. Aubert, L. Hallo, P. Ferrand and M. Buffat
Two numerical methods, based on high order finite volume formulationsand upwind schemes, are used to compute the two‐ and three‐dimensional flowfield in a transonic nozzle. The…
Abstract
Two numerical methods, based on high order finite volume formulations and upwind schemes, are used to compute the two‐ and three‐dimensional flow field in a transonic nozzle. The influence of numerical diffusivity, boundary treatment and mesh structure is explored for inviscid and turbulent configurations. First order computations provide significantly different inviscid results. However, high order methods lead to similar solutions. An explanation of the error generated through the shockwave is proposed in this case. The two‐dimensional interaction of the shock with the thin turbulent boundary layer developing on the bump wall is also presented. Good agreement between both approaches is obtained considering the rapid thickening of the boundary layer due to the shock. Furthermore, the downstream velocity recovery is almost identical. Only slight discrepancies occur in the main flow, near the outer edge of the boundary layer. These seem to be related to the way the turbulence model deals with the free stream turbulence. Finally, preliminary three‐dimensional unstructured turbulent results are presented and discussed.
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Rashmi Aggarwal, Harsahib Singh and Vinita Krishna
The case is written on the basis of published sources only.
Abstract
Research methodology
The case is written on the basis of published sources only.
Case overview/synopsis
Doodlage, a start-up incorporated in 2012 by Kriti Tula, Paras Arora and Vaibhav Kapoor, used discarded waste to create sustainable fashion products. It had a first-mover advantage in recycled fashion goods in the first 10 years of its existence. The company contributed to sustainable fashion by providing an alternative to fast fashion production, creating enormous clothing waste and environmental degradation. In the first quarter of 2022, it saved and reused 15,000 m of fabric waste. From 2018 to 2021, the company grew 150% annually, targeting the right customers and regions to expand its business. It ensured that postproduction industrial waste and postconsumption garments were used to produce clothes. It also confirmed that the waste generated in its fabric screening process was used to create stationery items and other valuable accessories.
However, the sustainable fashion model that gave the company a competitive advantage became obsolete in 2022 due to increasing competition in the industry as various players using unique ideas entered the market. The company is encountering operational and logistical challenges that are affecting its performance. The demand for its products was also subdued due to high prices of upcycled and recycled clothes and less consumer spending post-COVID pandemic. The competitors of Doodlage offered multiple products produced using environmentally friendly farming and manufacturing techniques, attracting sustainable purchasers. What should be the new portfolio of products for the company to explore future growth opportunities? Considering their vast price, can consumers be encouraged to buy upcycled clothes? How should the company ride the winds of change in the industry?
Complexity academic level
The instructor should initiate the class discussion by asking questions such as how frequently do you shop for clothes? Do you care about the fabric of your apparel? After you discard your clothes, do you think about where these goods finally end up? Data on the amount of total waste generated in the fashion industry should be communicated to students to connect it with the importance of the concept of circular economy. Post this, the instructor should introduce the business model of Doodlage to bring the discussion into the context of the fashion industry before going ahead to discuss the company’s dilemma.
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Abdurrahim Dal, Mahir Sahin and Mustafa Kilic
Bearing performance characteristics, such as stiffness and load capacity, are related to the viscosity of the fluid circulating through the gap. Nanoparticle additives in…
Abstract
Purpose
Bearing performance characteristics, such as stiffness and load capacity, are related to the viscosity of the fluid circulating through the gap. Nanoparticle additives in lubricant are one way to enhance of the viscosity. This study aims to investigate the effect of nanoparticle additives on the thermohydrodynamic performance of journal bearing with different bearing parameters.
Design/methodology/approach
The temperature distribution is modeled using a three-dimensional energy equation. The velocity components are calculated on the pressure distribution governed by Dowson’s equation. Moreover, the heat transfer between the journal and lubricant is modeled with Fourier heat conduction equation. On the other hand, the viscosity equation is derived for Al2O3 nanoparticles as a function of the volume ratio and the temperature. An algorithm based on the finite difference method is developed, and a serial simulation is performed for different parameters and different volume ratio of nanoparticle.
Findings
With the increase in the nanoparticle volume ratio, the maximum temperature decreases for the lower clearance values, but the addition of the nanoparticle influence on the maximum temperature reverses when the clearance grows up. The nanoparticle additives increase further the maximum temperature for higher values of L/D ratios. Moreover, the effects of the nanoparticle additives on the pressure are stronger at high eccentricity ratios for all bearing parameters.
Originality/value
This paper provides valuable design parameters for journal bearing with lubricant containing the nanoparticle additives.