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Dyeing and printing are important steps in textile manufacturing. After the process completion, these dyes are released in the effluent. These dyes impart an unacceptable appearance but are also toxic to the soil and water bodies. The present research has been carried out to study the rate of photocatalytic degradation of an azo dye, namely, CI Direct Green 26, using titania nanoparticles under ultra violet (UV) irradiation as a function of temperature and time. Azo dyes account for the majority of all dyestuffs are produced and extensively used in the textile, paper, food, leather, cosmetics and pharmaceutical industries. Titania nanoparticles have been found to successfully degrade these dyes in the presence of UV light. The purpose of the present paper was to study the photodegradation of azo dyes using titania nanoparticles at different temperatures and time periods.

Titania nanoparticle concentration of 0.1% (w/v) was dispersed in distilled water by sonication for 1 h in sonication bath. The of rate of degradation of Direct Green 26 dye in the titania nanoparticle dispersion, under UV-A exposure was studied at different temperatures ranging from 25°C to 65 °C for time periods ranging from 1 h to 6 h. Photocatalytic degradation tests were performed in a specially designed UV reactor chamber. Raman spectroscopy of Titania nanoparticles, dye and titania/dye mixture before and after UV exposure was carried out using Confocal Laser Dispersion Raman Microscope (Renishaw, UK) with 785 nm excitation laser.

Titanium dioxide is an efficient photocatalyst for decolourisation of direct dye. The photodegradation of the direct Green dye was found to follow the pseudo first-order reaction. The Arrhenius activation energy was found to be 24.8 kJ/mol with A value of 0.0013 for the photocatalytic degradation of the dye. Raman spectroscopy also confirmed the adsorption of dye on titania nanoparticle and its complete degradation on exposure to UV light.

This research highlights the application of titania nanoparticles for the effective degradation of dye in the effluent from textiles, clothing, paper and any kind of dyeing process. Azo dyes account for the majority of all dyestuffs are produced and extensively used in the textile, paper, food, leather, cosmetics and pharmaceutical industries. Titania nanoparticles have been found to successfully degrade these dyes in the presence of UV light which can be very beneficial for the effluent treatment plants in textile and other industries.

Azo dyes are one of the harmful pollutants released in textile waste water. The degradation and removal of the coloured waste in the textile effluent is an important environmental concern and needs to be investigated. The research is one of the first to investigate and understand the mechanism of the degradation of an azo dye in the presence of titania nanoparticles by Raman spectroscopy.

The purpose of this paper is to present an up-to-date survey on the non-orthogonal multiple access (NOMA) technique with co-operative strategy, a fast-evolving fifth-generation (5 G) technology. NOMA is used for serving many mobile users, both in power and code domains. This paper considers the power-domain NOMA, which is now discussed as NOMA.

The first part of the paper discusses NOMA-based cooperative relay systems using different relay strategies over different channel models. In various research works, the analytical expressions of many performance metrics were derived, measured and simulated for better performance of the NOMA systems. In the second part, a brief introduction to diversity techniques is discussed. The multiple input and multiple output system merged with cooperative NOMA technology, and its future challenges were also presented in this part. In the third part, the paper surveys some new conceptions such as cognitive radio, index modulation multiple access, space-shift keying and reconfigurable intelligent surface that can be combined with NOMA systems for better performance.

The paper presents a brief survey of diverse research projects being carried out in the field of NOMA. The paper also surveyed two different relaying strategies that were implemented in cooperative NOMA over different channels and compared several performance parameters that were evaluated and derived in these implementations.

The paper provides a scope for recognizable future work and presents a brief idea of the new techniques that can be united with NOMA for better performance in wireless systems.

Marketing.

Post Graduate.

Rajiv Bapna and Pradeep Bapna co-founded Allied Electronics & Magnetics Limited (widely known as Amkette) in the year 1985 for the production of floppy diskettes in India. By the year 1995, Amkette was the largest selling floppy diskette brand in India. With the advent of new technology in storage media sale of floppy diskette observed a constant decline. By the end of year 2004, floppy diskettes completely vanished from the market. Amkette anticipated the changes in the computer peripherals market and introduced a wide range of products in storage media, wireless and wired peripherals, accessories and digital lifestyle products. After the launch of Evo TV on June 2012, Amkette was hopeful for a major success in digital lifestyle segment. Evo TV, a connected TV device, allowed consumers to use smart apps on their television sets and was a cost-effective substitute to Smart TVs. Amkette was betting very high on Evo TV for revenue generation and market development.

Following are the learning outcomes: to review the product life cycle of technology products, to understand evolving customers’ expectations and behavior, to assess the adoption process of innovative products and to explore the challenges associated with innovative products for market development.

Teaching notes are available for educators only. Please contact your library to gain login details or email support@emeraldinsight.com to request teaching notes.

CSS 8: Marketing.

The purpose of this study is to distinguish those emotions which customers express verbally during a failed remote service encounter from those which they do not. The study further attempts to investigate the post-consumption customer behaviour of verbally expressed and unexpressed negative customer emotions.

The authors used a survey-based research design. The hypotheses were tested through the “partial least squared structural equation modelling” method.

This study shows that in a failed remote service encounter, customers verbally express retaliatory rage emotions, such as anger and rage. At the same time, they are able to suppress rancorous rage emotions, such as disgust and contempt and do not express them verbally. The authors demonstrate that after emotions are verbally expressed during a failed remote service encounter, they are followed by the post-consumption behaviours of negative word of mouth and revenge; when emotions are not expressed verbally during a failed service encounter, they are followed up by exit behaviour.

The effects of variables, such as switching costs and individual and situational factors, can be investigated in the model. Future studies can also explore the role of organizational interventions, such as explanation and apology, on negative customer emotions during failed remote service encounters. Their moderating impact on customer behaviour during and after the encounters can be investigated.

This study has much practical relevance in the post-COVID-19 world, where remote service delivery is becoming the new normal in many sectors. In remote service delivery situations, verbally unexpressed negative emotions can remain undetected; however, they have negative consequences for firms. This study underscores the need to train frontline employees to notice these unexpressed emotions so that service recoveries can be initiated.

This paper contributes to the area of dysfunctional customer behaviour and service recovery. The existing literature has not explored whether some negative emotions are expressed during a failed service encounter and then acted upon later, and some emotions are not expressed but acted upon later. This study addresses the problem of firms getting caught unawares when they find customers resorting to undesirable post-consumption behaviour without demonstrating any verbal expressions during the preceding failed service encounters.

1. Analyze the factors influencing the creation of a social enterprise, while appreciating the theoretical perspectives on social entrepreneurship and social innovations. 2. Analyze the impact of social enterprises on sustainable development. 3. Recognize the need for different types of strategies in the varied situation. 4. Analyze the business model.

Shashi Kumar, the CEO of Akshayakalpa Farms & Foods Pvt Ltd (Akshayakalpa), is determined to take the business to the next growth level. He has integrated technology to measure and monitor the quality of milk and to reach out to tech-savvy customers. Owing to the preservative-free and short life of milk, he believes that redesigning the marketing and distribution strategies is the only way to ensure the massive expansion and growth that will enable Akshayakalpa to reach out to customers directly and quickly. Another issue he was facing was a lag in receivables. Their receivables from vendors were delayed and held up because of issues related to product spoilage and returns. This has posed a liquidity challenge to Akshayakalpa. Amidst all these challenges, he wants to develop the best strategy to take the business forward to the next level.

This case can be used in undergraduate or postgraduate courses in Management, Social Entrepreneurship and Business Sustainability with special relevance to social enterprise creation, enterprise growth strategies, sustainable development, sustainable business models, etc.

Teaching notes are available for educators only.

CSS 3: Entrepreneurship.

Polymeric fibres that have a unique capability to change their structure in response to small environmental changes such as pH, electrolyte and electric field are an attractive alternative for artificial muscles. Stimuli sensitive fibres were prepared by the modification of commercial polyacrylonitrile (PAN) fibres. The modification was carried out in two steps: thermo-oxidation and hydrolysis. During the thermo-oxidation step, the crosslinks imparted through the pendant nitrile groups provided a stable structure. While in the subsequent saponification step, the uncrosslinked nitrile groups were converted to responsive carboxylic acid groups. The effect of stabilization parameters and saponification conditions on the structure, properties and swelling behaviour of these fibres was investigated. The fibres showed muscle like expanding and contracting behaviour stimulated by changes in pH of the environment.

Nanoparticles of TiO₂ and ZnO were chemically synthesized by different routes and were characterized using Fourier transform infrared (FT-IR), Transmission electron microscopy (TEM), X ray diffraction (XRD) and Scanning electron microscopy (SEM). These particles were applied to cotton fabric using 1-10 wt% acrylic binder and cured. The photocatalytic activity of the finished fabric was investigated and a comparison was drawn between the synthesized and commercially available TiO₂ (Degussa P25) sample. Experiments were carried out by exposing the coffee stained samples to solar light. The self-cleaning leading to stain discolouration was quantified from the residual concentration of stain to assess the photoactivity of TiO₂ and ZnO nanoparticles. An attempt was also made to study the effect of concentration of nanoparticles (0.5-1.0 wt% on weight of fabric (owf) and acrylic binder concentration (1, 2, 10 wt% owf) on the self cleaning action. TiO₂ particles with smaller particle size of <10 nm was able to show significantly better activity than the commercial sample. At the same time, finish with nano ZnO though showed a bit lower activity; the self cleaning effect was significant and similar to the commercial TiO₂.

Efficacy of selected commercially available fluorocarbon-based finish agents, such as Oleophobol (Huntsman) Fluoroguard SX and Fluoroguard VOX (Britacel Silicones) Nuva HPU (Clariant) TG-581 (Resil) Aquaphobe-SNT (Akkshata), on cotton and polyester fabrics was studied with respect to water and oil repellency. All the finish agents exhibited excellent water- and oil-repellent properties on both kinds of fabrics. The contact angle of water on the finished cotton and polyester fabrics was found to be ≥ 140° Nuva HPU and Oleophobol gave cotton very good protection against rain. Except Aquaphobe SNT, all other finishes imparted excellent oil-repellent property to cotton. In the case of polyester, maximum oil repellency was achieved with Aquaphobe SNT and Fluorogard SX. The finished polyester fabric showed minimal absorption and better resistance to penetration of water as compared to cotton when subject to the Bundesmann water repellency test. There was a slight yellowing of the cotton fabric after the application of Oleophobol finish. There was no effect on the strength of the fabrics. The effect of these finishes on the crease recovery angle and the bending length of cotton was not significant, However, the polyester fabric became slightly stiffer after the application of the finishes. The crease recovery angle of polyester also increased after the application of these finishes. The finished fabrics showed good water repellency up to 15 washes. Oil repellency showed deterioration after only 5 washes and was partially retained up to 15 washes. Both water and oil repellency became negligible after 30 washes.

A fixed wing unmanned aerial vehicle (FWUAV) is targeted to perform processor in the loop (PIL) simulations for the flight scenarios such as straight and level, level climb, level turn, climbing turn and level steady heading sideslip under windy conditions such as steady wind (SW) and wind gust (WG) in a desired and controlled manner.

The constrained multi-input–multi-output (MIMO) lateral and longitudinal linear models-based model predictive controllers (MPCs) which are proposed in a previous study (Ulker et al., 2017) are tested in the PIL simulations under specified windy conditions. BeagleBone Black Rev C is used as a target hardware or processor in the PIL simulations.

The results of the PIL simulations show that the MPCs proposed in the previous study can achieve satisfactory performance and flying qualities for the all flight scenarios handled in this paper under windy conditions.

The MPCs proposed in the previous study can be easily implemented in the real world to a low-cost and small-sized board like BeagleBone Black Rev C which is used in this paper.

The proposed MPCs in the previous study which are capable of providing more flexibility in terms of tracking complex trajectories are showed to be able to be implemented to real system by means of PIL simulations under the changeable windy conditions which are difficult for performance tests.

The purpose of this research is to assess the removal of oil spills from the seawater surface as well as the antibacterial activity of ZnFe₂O₄-cetyltrimethylammonium bromide (CTAB, cationic surfactant) magnetic nanoparticles (ZFO-CTAB MNPs).

A CTAB-assisted sol–gel method was used to synthesize ZFO-CTAB MNPs. X-ray powder diffraction and Fourier transform infrared spectroscopy were used for ZFO-CTAB MNPs characterization. Also, the magnetic force and apparent density of ZFO-CTAB MNPs were determined. The oil spill cleanup was investigated by using the gravimetric oil removal (GOR) technique, which used ZFO-CTAB MNPs as oil absorbent material and four oil samples (crude, diesel, gasoline and used oil) as oil spill models. The antibacterial activity of ZFO-CTAB MNPs against Gram-negative bacteria (Pseudomonas aeruginosa, Escherichia coli and Salmonella typhi) was investigated by using the optical density method.

The results revealed that, when the amount of ZFO-CTAB was 0.01 g, gasoline oil had the highest GOR (51.80 ± 0.88 g/g) and crude oil had the lowest (11.29 ± 0.82 g/g). Furthermore, for Escherichia coli, Salmonella typhi and Pseudomonas aeruginosa, ZFO-CTAB MNPs inhibited bacterial growth with a higher percentage (94.24%–95.63%).

The applications of ZFO-CTAB MNPs in the cleanup of oil spills from aqueous solutions, as well as their antibacterial activity. The results showed that ZFO-CTAB MNPs are a promising material for removing oil spills from bodies of water as well as an antibacterial agent against Gram-negative bacterial strains.