A Monitor of Beam Polarization Profiles for the TRIUMF Parity Experiment

TRIUMF experiment E497 is a study of parity violation in pp scattering at an energy where the leading term in the analyzing power is expected to vanish, thus measuring a unique combination of weak-interaction flavour conserving terms. It is desired to reach a level of sensitivity of 2x10^-8 in both statistical and systematic errors. The leading systematic errors depend on transverse polarization components and, at least, the first moment of transverse polarization. A novel polarimeter that measures profiles of both transverse components of polarization as a function of position is described.Comment: 19 pages LaTeX, 10 PostScript figures. To appear in Nuclear Instruments and Methods in Physics Research, Section

Longitudinal trends in exercise capacity and health status after pulmonary rehabilitation in patients with COPD

AbstractPulmonary rehabilitation (PR) programmes produce initial improvements in exercise tolerance and health status in patients with chronic obstructive pulmonary disease (COPD). However, there is limited data on the longer term effects of PR. This study has examined whether the initial benefits gained in exercise tolerance and health status may be maintained after a 1-year follow-up programme. Sixty-six patients with COPD were assessed with the MRC Dyspnoea Scale and found to be moderately disabled due to dyspnoea (MRC Grades 3 and 4). These patients were then randomised to an 8 week outpatient programme of either exercise training and education (Exercise group) or to education alone (Control group). Exercise performance was assessed with the shuttle walking test and health status assessed with two disease-specific measures, the St George's Respiratory Questionnaire and the Chronic Respiratory Disease Questionnaire. After PR, all patients were invited to attend monthly follow-up sessions for 1 year. Fifty-six patients were available for follow-up immediately after the programme and were assessed at 6 months and 1 year.This study has shown that the patients in the Exercise group maintained improvements in exercise capacity and health status up to 6 months after an 8 week programme. At 1 year there was a significant difference between the Exercise and Control groups in terms of exercise tolerance due to a considerable decline experienced by the Control group. However, neither group had maintained improvements in health status at 1 year. Further study is required to assess whether benefit may be sustained for a longer period using alternative follow-up strategies

Value propositions: a service ecosystems perspective

Despite significant interest in value propositions, there is limited agreement about their nature and role. Moreover, there is little understanding of their application to today’s increasingly interconnected and networked world. The purpose of this article is to explore the nature of value propositions, extending prior conceptualisations by taking a service ecosystem perspective. Following a critical review of the extant literature in service science on value propositions, value co-creation, service-dominant logic and networks and drawing on six metaphors that provide insights into the nature of value propositions, we develop a new conceptualisation. The role of value propositions is then explored in terms of resource offerings between actors within micro, meso and macro levels of service ecosystems. We illustrate these perspectives with two realworld exemplars. We describe the role of value propositions in an ecosystem as a shaper of resource offerings. Finally, we provide five key premises and outline a research agenda