Synthesis, structure and conductivity of sulfate and phosphate doped SrCoO3

In this paper we report the successful incorporation of sulfate and phosphate into SrCoO3 leading to a change from a 2H– to a 3C–perovskite polymorph. Structural characterization by neutron diffraction showed extra weak peaks related to oxygen vacancy ordering, and these could be indexed on an expanded tetragonal cell, containing two inequivalent Co sites, similar to previously reported for Sb doped SrCoO3. Conductivity measurements on the doped systems showed a large enhancement compared to the undoped hexagonal system, consistent with corner–sharing of CoO6 octahedra for the former. Further work on the doped samples shows, however, that they are metastable, transforming back to the hexagonal cell on annealing at intermediate temperatures. The incorporation of Fe was shown, however, to improve the stability at intermediate temperatures, and these co–doped phases also showed high conductivities

The thought behind the utterance : Aspects of Communication in Song

This thesis investigates how a classically trained recital singer may set about achieving mastery in his or her field. It draws upon the ideas and opinions of writers on singing, pedagogy, composition, aesthetics, rhetoric, acting and psychology. It also draws upon the experience of the author as a singer whose career has spanned thirty years as performer and recording artist, teacher of voice and repertoire, and who has written on the history and interpretation of English song. The main thrust of the argument is that the complete performer must engage the mind in every aspect of the craft, whether it be in the creation of vocal sound, in the preparation of musical and textual material, or in the visualisation and realisation of the character of a song’s protagonist: prescriptive instruction alone is not sufficient to achieve this aim. Chapter one, The voice, maintains that intellect, musicianship, imagination and visualisation go hand-in-hand with vocal technique and natural talent to create the consummate performer. Chapter two, Visual presentation, explores the visual element of performance, and how feeling may be convincingly displayed through appropriate use of the body. Chapter three, The mode o f address, looks at the delivery of text and how this may affect the performer’s focus of attention. Chapter four, The poem’s provenance, discusses how the significance of a text may be affected by the context in which it is found. Chapter five, Meaning, highlights some problems encountered in translating or interpreting texts. Chapter six, Interpretation o f a non-English text, looks in some detail at a particular song in order to explore how the nuanced meanings of poetic language can be preserved during the process of translation. Chapter seven, The thought behind the utterance, contains a discussion of the moment the protagonist finds a new thought before expressing i

Gold mining on Mayan-Mam territory: Social unravelling, discord and distress in the Western highlands of Guatemala

This article examines the influence of a large-scale mining operation on the health of the community of San Miguel Ixtahuacán, Guatemala. An anti-colonial narrative approach informed by participatory action research principles was employed. Data collection included focus groups and one-on-one interviews from August to November of 2011. Over this period, we interviewed 15 Mam Mayan men and 41 women (n=56) between the ages of 18 and 64 including health care workers, educators, spiritual leaders, agricultural workers and previous mine employees from 13 villages within the municipality. Participants\u27 accounts pointed to community health experiences of social unravelling characterized by overlapping narratives of a climate of fear and discord and embodied expressions of distress. These findings reveal the interconnected mechanisms by which local mining operations influenced the health of the community, specifically, by introducing new threats to the safety and mental wellbeing of local residents. © 2014 The Authors

Gold mining on Mayan-Mam territory: Social unravelling, discord and distress in the Western highlands of Guatemala

This article examines the influence of a large-scale mining operation on the health of the community of San Miguel Ixtahuacán, Guatemala. An anti-colonial narrative approach informed by participatory action research principles was employed. Data collection included focus groups and one-on-one interviews from August to November of 2011. Over this period, we interviewed 15 Mam Mayan men and 41 women (n=56) between the ages of 18 and 64 including health care workers, educators, spiritual leaders, agricultural workers and previous mine employees from 13 villages within the municipality. Participants\u27 accounts pointed to community health experiences of social unravelling characterized by overlapping narratives of a climate of fear and discord and embodied expressions of distress. These findings reveal the interconnected mechanisms by which local mining operations influenced the health of the community, specifically, by introducing new threats to the safety and mental wellbeing of local residents. © 2014 The Authors

A portable diagnostic device for cardiac magnetic field mapping

In this paper we present a portable magnetocardiography device. The focus of this development was delivering a rapid assessment of chest pain in an emergency department. The aim was therefore to produce an inexpensive device that could be rapidly deployed in a noisy unshielded ward environment. We found that induction coil magnetometers with a coil design optimized for magnetic field mapping possess sufficient sensitivity (104fT /√ Hz noise floor at 10Hz) and response (813fT /µV at 10Hz) for cycle averaged magnetocardiography and are able to measure depolarisation signals in an unshielded environment. We were unable to observe repolarisation signals to a reasonable fidelity. We present the design of the induction coil sensor array and signal processing routine along with data demonstrating performance in a hospital environment

Absolute frequency measurements of 85Rb nF7/2 Rydberg states using purely optical detection

A three-step laser excitation scheme is used to make absolute frequency measurements of highly excited nF7/2 Rydberg states in 85Rb for principal quantum numbers n=33-100. This work demonstrates the first absolute frequency measurements of rubidium Rydberg levels using a purely optical detection scheme. The Rydberg states are excited in a heated Rb vapour cell and Doppler free signals are detected via purely optical means. All of the frequency measurements are made using a wavemeter which is calibrated against a GPS disciplined self-referenced optical frequency comb. We find that the measured levels have a very high frequency stability, and are especially robust to electric fields. The apparatus has allowed measurements of the states to an accuracy of 8.0MHz. The new measurements are analysed by extracting the modified Rydberg-Ritz series parameters.Comment: 12 pages, 5 figures, submitted to New. J. Phy

Internal-quantum-state engineering using magnetic fields

We present a general, semi-classical theory describing the interaction of an atom with an internal state consisting of a number of degenerate energy levels with static and oscillating magnetic fields. This general theory is applied to the 3P2 metastable energy level of neon to determine the dynamics of the populations and coherences that are formed due to the interaction. Through these calculations we demonstrate how the interaction may be used for the internal state preparation of an atom