Search results

This paper aims to synthesize 6-ethyl-4-hydroxyquinolin-2(1H)-one as a new enol-type coupling component in the preparation of some 3-arylazo-4-hydroxyquinolin-2(1H)-one dyes and evaluate the solvent effects on their absorption in ultraviolet-visible spectra.

6-Ethyl-4-hydroxyquinolin-2(1H)-one was synthesized by thermal cyclocondensation reaction of N, N′-bis(4-ethylphenyl) malonamide at 130–140°C in polyphosphoric acid. This compound was then applied in the azo-coupling reaction with some aniline-based diazonium salts, so as to prepare seven new mono-heterocyclic azo dyes. The structures of the compounds were confirmed using mass spectroscopic technique. Fourier transform infra red (FT-IR) and 1H proton nuclear magnetic resonance (1H NMR) and carbon-13 nuclear magnetic resonance (13 C NMR) studies on the structure of the azo compounds revealed that they exist as two E- and Z-isomers of hydrazone tautomer both in solid and solution state. The effects of acid and base on the visible absorption spectra of the dyes were also evaluated and discussed.

Ultra violet-visible UV-vis absorption spectra of the dyes didn’t show significant variation by changing of solvents because of intramolecular H-bonding between proposed hydrazone forms and 2- and 4-keto functions in their structures. The spectra of the dyes were not sensitive to the addition of acid but were very sensitive to base.

The synthesized 3-arylazo-4-hydroxyquinolin-2(1H)-one dyes are new members in the 4-hydroxyquinolin-2(1H)-one azo dyes family, where very few details regarding the synthesis of such dyes are reported before in the literature. They are unique in terms of synthesis and spectral properties.

The purpose of this paper is to present current state of understanding on jet electrodeposition manufacturing; to compare various experimental parameters and their implication on as deposited features; and to understand the characteristics of jet electrodeposition deposition defects and its preventive procedures through available research articles.

A systematic review has been done based on available research articles focused on jet electrodeposition and its characteristics. The review begins with a brief introduction to micro-electrodeposition and high-speed selective jet electrodeposition (HSSJED). The research and developments on how jet electrochemical manufacturing are clustered with conventional micro-electrodeposition and their developments. Furthermore, this study converges on comparative analysis on HSSJED and recent research trends in high-speed jet electrodeposition of metals, their alloys and composites and presents potential perspectives for the future research direction in the final section.

Edge defect, optimum nozzle height and controlled deposition remain major challenges in electrochemical manufacturing. On-situ deposition can be used as initial structural material for micro and nanoelectronic devices. Integration of ultrasonic, laser and acoustic source to jet electrochemical manufacturing are current trends that are promising enhanced homogeneity, controlled density and porosity with high precision manufacturing.

This paper discusses the key issue associated to high-speed jet electrodeposition process. Emphasis has been given to various electrochemical parameters and their effect on deposition. Pros and cons of variations in electrochemical parameters have been studied by comparing the available reports on experimental investigations. Defects and their preventive measures have also been discussed. This review presented a summary of past achievements and recent advancements in the field of jet electrochemical manufacturing.

This paper argues that Bruno Latour’s work on translation provides an alternative to dominant anthropocentric, individualistic and managerial approaches in career studies by considering careers as precarious effects of networks instead of the implicit assumption of individual strategic career actors in extant career research paradigms.

The article first compares the three main current approaches to studying careers – structural functionalist, interpretivist and critical – illustrated by three exemplary empirical studies. Subsequently, three concepts from the sociology of translation that are relevant for the study of careers are introduced: career making as translating interests, careers as effects of networks and career action as dislocated and overtaken. Taken together, these three concepts allow us to conceive of careers as practices performed by human and nonhuman actors. Finally, an example from an ethnographic case study in the field of contemporary art illustrates how a Latourian approach can be used.

Latour’s work on translation provides conceptual and methodological tools to investigate career processes and practices in an era of unpredictability.

The paper introduces Bruno Latour’s work on translation to the study of careers.

A total of 25 years of research on the audit society has provided rich and engaging accounts of the ways in which rituals of verification have conditioned organizations and individuals to think and act. In contrast, this paper aims to explore the possibility of conditions through which things and spaces are enacted to be non-auditable.

Using the concept of proliferation and rarefaction (Callon and Law, 2005), the paper adopts a case-comparison design to explore two empirical sites. The first investigates a vast excess of audit structures against the case of the biggest corporate fraud in German accounting history, the Wirecard scandal. The second discusses the configuration of Tinder, the most popular provider of mobile dating and the absence of visible verification mechanisms.

The paper argues that things can become non-auditable through two mechanisms. Based on the two empirical sites, non-auditability can happen through an overload of auditable resources or, through the withdrawal of required resources. The paper discusses the consequences of this finding and suggests avenues for future research on non-auditability.

While accounting scholars have extensively addressed the audit explosion and traced how audit practices have journeyed into ever more novel terrains, this paper discusses forms of escape from the value-subverting and reductive accounts incorporated in the audit society. It thereby points to conditions under which accounting ends.

This paper aims to report the findings of a survey study exploring perceptions about cognitive impairment. These findings are relevant to public health campaigns and education programmes.

A survey exploring respondents’ views and knowledge about mild cognitive impairment (MCI) was circulated via UK networks. A total of 417 respondents completed the survey, including people living with cognitive impairment (n = 10), care partners (n = 23), older adults (n = 83), younger adults (n = 83), general health-care professionals (n = 96), dementia specialist health-care professionals (n = 48) and dementia specialists (n = 40).

Respondents were more confident in their knowledge about dementia than cognitive impairment but wanted more information about both conditions. Younger adults were uncertain about many aspects of MCI, and were the most likely to view MCI as a normal part of ageing. Diet (45.1%, n = 188) and personal behaviour (63.8%, n = 266) were the least endorsed possible causes of MCI, suggesting a lack of awareness of lifestyle choices as risk factors for MCI.

The results highlight the need to provide education and awareness raising about MCI to enable people to seek help in a timely manner and be able to make informed lifestyle choices that may reduce their risk of MCI and dementia. Implementing education about MCI and dementia in schools is a key target, as younger people were the most uncertain or misinformed about these topics. It is clear that further public health initiatives around MCI are both warranted and welcomed by the general public.

This paper aims to examine the consequences of Covid-19 for the migrants and the tourism industry following the emergence of the new business models and operational practices in the following three areas: i) Covid-19 and post-Covid-19 labour shortages, ii) the development of migrant gig jobs and iii) future trends.

Covid-19 posed challenges for labour retention and has given rise to new outsourced and precarious forms of employment. The growth of various tourism-related apps and establishments, such as “ghost kitchens” or pop-up restaurants, has transformed the landscape of tourism work and opportunities. This short paper provides an overview of the labour consequences of Covid-19, focusing on migrant tourism workers.

Despite growing attention towards promoting sustainable, just and decent employment, global trends and changing industrial relations in the sector have led to heightened levels of precariousness and uncertainty in migrants’ work.

This paper contributes to the literature on tourism employment by examining the forms of new business models and operational practices that affect migrant labour.