Characterisation of atmospheric single particles in industrial and regional background environments using aerosol time of flight mass spectrometry

The composition of atmospheric particles is an important factor in determining their impact on climate and health. In this study, an aerosol time-of-flight mass spectrometer (ATOFMS) was used to measure the chemical composition of ambient single particles at two contrasting locations – an industrial site in Dunkirk, France and a regional background site in Corsica. The ATOFMS data were combined with meteorological information and other particle measurements to determine the various sources of the particles observed at the sites. The particle classes detected in Dunkirk included carbonaceous species from fossil fuel combustion and biomass burning, metal-containing types from local industries and seasalt. Highest particle number concentrations and mass concentrations of PM2.5, black carbon, organics, nitrate, ammonium and several metallic species (Fe, Mn, Pb, Zn) were found during periods heavily influenced by local industry. Particles from a ferromanganese alloy manufacturing facility were identified by comparing ambient ATOFMS data with single particle mass spectra from industrial chimney filters and ores. Particles from a steelworks were identified based on comparison of the ambient data with previous studies. Based on these comparisons, the steelworks was identified as the dominant emitter of Fe-rich particles, while the ferromanganese alloy facility emitted Mn-rich particles. In Corsica, regional transport of carbonaceous particles from biomass burning and fossil fuel combustion was identified as the major source of particles in the Mediterranean background aerosol. Throughout the campaign the site was influenced by air masses altering the composition of particles detected. During North Atlantic air masses the site was heavily influenced by fresh sea salt. Regional stagnation was the most common type of air mass regime throughout the campaign and resulted in the accumulation of carbonaceous particles during certain periods. Mass concentrations were estimated for ATOFMS particle classes, and good agreement was found between the major carbonaceous classes and other quantitative measurements. Overall the results of this work serve to highlight the excellent ability of the ATOFMS technique in providing source-specific composition and mixing state information on atmospheric particles at high time resolution.

The many voices of Piedmont: language, identity and alterity in the works of modern and contemporary Piedmontese writers

The aim of this project is to carry out a linguistic analysis of a group of modern and contemporary narratives written by authors from the same Italian region: Piedmont. The novels and short stories examined stand out for the intriguing ways in which they move between a variety of idioms – Italian, Piedmontese dialects, English and pastiches, with some rare excursions into French. A sociolinguistic study and an overview of political changes that Piedmont underwent from the sixteenth to the twenty-first centuries are provided, with the purpose of outlining the region’s sociogeographical and historical background which can be seen to have fostered multilingualism in a group of writers. With the support of linguistic studies and philosophical theories on the relation between identity, alterity and language (such as Edwards’s Language and Identity and Bakhtin’s reflections on language), I then elucidate the presence of diverse linguistic varieties in selected narratives by Cesare Pavese, Beppe Fenoglio, Primo Levi, Nanni Balestrini, Fruttero & Lucentini, Benito Mazzi and Younis Tawfik. In other words, my purpose is to explain the reasons for multilingualism in each writer, as well as to underscore the ideological positions which lie behind the linguistic strategies of the authors. With this study I attempt to fill a gap and cast new light on Piedmontese literature. Although some critical studies on the use of dialect or English exist on individual authors and works (e.g. Meddemmem on Fenoglio’s use of English and Beccaria on Pavese’s inclusion of Piedmontese dialect), and some important contributions to the history of Piedmontese literature have appeared in print, to date no current, systematic study that compares different Piedmontese writers under the language/identity theme has been published. The study concludes with a summary of the evolution of plurilingualism in Piedmont and highlights the common trends in the use of multiple linguistic varieties as tools for both social demarcation and an opening up to alternative, marginalised andforeign cultures.

Low valence cation doping of bulk Cr2O3: Charge compensation and oxygen vacancy formation

The different oxidation states of chromium allow its bulk oxide form to be reducible, facilitating the oxygen vacancy formation process, which is a key property in applications such as catalysis. Similar to other useful oxides such as TiO2, and CeO2, the effect of substitutional metal dopants in bulk Cr2O3 and its effect on the electronic structure and oxygen vacancy formation are of interest, particularly in enhancing the latter. In this paper, density functional theory (DFT) calculations with a Hubbard + U correction (DFT+U) applied to the Cr 3d and O 2p states, are carried out on pure and metal-doped bulk Cr2O3 to examine the effect of doping on the electronic and geometric structure. The role of dopants in enhancing the reducibility of Cr2O3 is examined to promote oxygen vacancy formation. The dopants are Mg, Cu, Ni, and Zn, which have a formal +2 oxidation state in their bulk oxides. Given this difference in host and, dopant oxidation states, we show that to predict the correct ground state two metal dopants charge compensated with an oxygen vacancy are required. The second oxygen atom removed is termed "the active" oxygen vacancy and it is the energy required to remove this atom that is related to the reduction process. In all cases, we find that substitutional doping improves the oxygen vacancy formation of bulk Cr2O3 by lowering the energy cost.

Nurses', midwives' and key stakeholders' experiences and perceptions on requirements to demonstrate the maintenance of professional competence.

Aim: To present the qualitative findings from a study on the development of scheme(s) to give evidence of maintenance of professional competence for nurses and midwives. Background: Key issues in maintenance of professional competence include notions of self- assessment, verification of engagement and practice hours, provision of an evidential record, the role of the employer and articulation of possible consequences for non-adherence with the requirements. Schemes to demonstrate the maintenance of professional competence have application to nurses, midwives and regulatory bodies and healthcare employers worldwide. Design: A mixed methods approach was used. This included an online survey of nurses and midwives and focus groups with nurses and midwives and other key stakeholders. The qualitative data are reported in this study. Methods: Focus groups were conducted among a purposive sample of nurses, midwives and key stakeholders from January–May 2015. A total of 13 focus groups with 91 participants contributed to the study. Findings: Four major themes were identified: Definitions and Characteristics of Competence; Continuing Professional Development and Demonstrating Competence; Assessment of Competence; The Nursing and Midwifery Board of Ireland and employers as regulators and enablers of maintaining professional competence. Conclusion: Competence incorporates knowledge, skills, attitudes, professionalism, application of evidence and translating learning into practice. It is specific to the nurse's/midwife's role, organizational needs, patient's needs and the individual nurse's/midwife's learning needs. Competencies develop over time and change as nurses and midwives work in different practice areas. Thus, role-specific competence is linked to recent engagement in practice.