The Electrochemical Oxidation of Organic Selenides and Selenoxides

The electrochemical oxidation of alkyl and aryl selenides was investigated in acetonitrile. The oxidation of diphenyl selenide and di(4‐methylphenyl) selenide led primarily to the formation of their respective selenoxides, which were identified by exhaustive coulometric oxidation and and analysis of the products. The selenoxide itself was not observed in the cyclic voltammetry of the selenide for two reasons: first, the protonation of the selenoxide by the acid formed from the reaction of water with the cation radical and second, the formation of a selenoxide hydrate. The formation of the hydrate with diphenyl selenoxide was verified by isolation of the dimethoxy derivative. In addition to the selenoxide, selenonium compounds, formed by the coupling of the oxidized material, were also observed. The alkyl selenides were generally oxidized at a lower potential than the aryl selenides. This trend is different from the sulfur analogues, where the aryl sulfides are easier to oxidize than their alkyl counterparts. As a result, the difference in their redox potentials is relatively small. These differences may occur because the oxidation of aryl sulfides is more likely to take place on the aromatic ring, which leads to a greater yield of the coupled products (about 100%) when compared to the selenide analogue

Computation of Planar Store Trajectories Using an Adaptive Grid Procedure

The objective of this research was to compare a quasi-analytical, potential flow/three-degree-of-freedom model to an implicit-Euler algorithm for the calculation of store trajectories. The implicity algorithm uses a cell- centered, finite-volume, spatial discretization applied to the Euler equations, written in time-dependent, curvilinear-coordinates. A flux-differencing Roe scheme is employed to find the split-fluxes and the Steger/Warming flux-vector method is used to calculate the flux-Jacobians. The potential flow and implicit- Euler algorithm are combined with a three-degree-of-freedom algorithm to evaluate the planar, freefall trajectories of a simple store shape. The research uses two different grid-modification techniques in the implicit algorithm evaluation. Data collected for both grids used the minimum time-step in the three-degree-of-freedom algorithm for a Courant number of 10. Two test cases involved updating the flux-Jacobians after every time-step and only once during every 1000 iterations. The effect of multiplying the minimum time-step by factors of 2, 4, 6, 8, 10, and 100 were also examined. The potential flow and implicit algorithm trajectories didn\u27t compare very closely. The various Δ t and Jacobian-update results matched rather closely

Globalisation and HR practices in Africa: When culture refuses to make way for so-called universalistic perspectives

The paper demonstrates and exemplifies how cultural paradigms and the political and socio-economic spheres and organisational life are intertwined in an African context. The paper examines how some factors that are embedded in the cultural and institutional framework in Sub-Saharan African organisations interact with global perspectives and the degree of resistance they present to changes in human resource management (HRM) processes. The paper considers aspects of the universalistic perspectives that have resonance for human resource practices in Africa. Furthermore, it evaluates the question of the tensions between the contributions derived from the indigenous and historical factors, and the inputs from external sources, to human resource management in Africa. rnThe research is based on a survey of 100 practicing African human resources professionals. The respondents were drawn from the major institutional actors in Nigeria. rnThe research found that, despite the impact of globalisation and the Westernisaion of training and development in Africa, HRM practices remain largely culture-bound. Many aspects of Sub-Saharan African cultures pervade organisational processes, e.g. collectivism and paternalism, that refuse to make way for change. However, the paper concludes that some of these temerarious cultural aspects that are often described as counter-productive in much of the literature, could actually be utilised for community and employee engagement. rnThe paper makes a significant contribution to the literature on HRM practices in Africa, an area under-researched. It provides an opportunity to African HR managers to be more pragmatic in identifying the contextual issues and for beginning to identify aspects of African culture that could be value-adding in a fast changing management landscape. The paper demonstrates that HRM policies have specific cultural orientations and reflect on both the societal predispositions of the region; this exemplifies how cultural paradigms, the political sphere and organisational life are intertwined in an African context

Resisting global universalistic practices - the endurance of culture and particularism in African HRM

Purpose This article empirically assesses the extent to which factors rooted in the cultural and institutional framework in Sub-Saharan African organisational contexts challenge and resist the penetration of global practices and how these dynamics impact on human resource management (HRM). This article examines universalistic perspectives are significant for African HRM. The article discusses the tensions between the contributions derived from local and historical factors, and that of other environmental agents, to African HRM practice. Design/methodology The study is based on a survey among 100 practising African HRM executives representing significant organisations in Sub-Saharan Africa. Findings The main findings established that, in spite of Westernisation and globalising trends in learning and development in Africa, human resource practices are still profoundly embedded in the African cultural fabric. Significant elements of cultures in Sub-Saharan Africa pervade organisational processes; such aspects include collectivism and paternalism, which persistently resist change. The article, however, concludes that the resisting parts of Sub-Saharan African cultures which are viewed as counter-productive, can have positive resonance if constructively deployed. Originality This article contributes to African HRM literature, a significantly under-researched field. The paper provides an opportunity for African HR managers to be more pragmatic in identifying the contextual issues as well as aspects of African culture that could be value-adding in a fast-changing managerial field. The findings demonstrate that human resource strategies and policies have specific cultural orientations and reflect the societal predispositions of a particular collectivity; this epitomizes the intertwining of cultural paradigms, political spheres and organisational life in Sub-Saharan Afric

The Employment Situation of Migrant Workers and Their Experience of Work Life Pressures

The chapters in this book cover different aspects of the migrant experience of social life and employment in contemporary societ

Noise Control in the Urban Environment

An environmental problem that has been the subject of increasing attention in recent years is the high level of noise that has become so characteristic of the urban environment

No one is safe! But who’s more susceptible? Locus of control moderates pandemic perceptions’ effects on job insecurity and psychosocial factors amongst MENA hospitality frontliners: a PLS-SEM approach

Background The research aimed to formulate and test a model concerning COVID-19 perceptions effects on job insecurity and a set of psychosocial factors comprising anxiety, depression, job burnout and job alienation in the Middle East and North African (hereafter, MENA) regional context. Also, the study attempted to examine whether locus of control can moderate these hypothesised linkages amongst customer service employees working in MENA hospitality organisations. Methods The study is based on a sample of 885 responses to an online survey and Partial Least Square Structural Equation Modelling (PLS-SEM). Results The main findings show the existence of a significant correlation between COVID perceptions and job insecurity and all psychosocial factors, i.e., more intense COVID-19 perceptions accompany higher levels of job insecurity, anxiety, depression, job burnout and job alienation. Furthermore, our results revealed that, in pandemic time, hospitality customer service employees with external locus of control are more likely to suffer higher alienation, anxiety and depression than those with internal locus of control. Conclusions The research originality centres on the establishment that COVID-19 has a severe negative impact within the hospitality customer service labour force (in the MENA region). These effects were more profound for participants who claimed external locus of control than those with internal locus of control