RESUMO
We report systematic analysis and comparison of ps-laser microwelding of industry relevant Al6082 parts to SiO2 and BK7. Parameter mapping of pulse energy and focal depth on the weld strength is presented. The welding process was found to be strongly dependent on the focal plane but has a large tolerance to variation in pulse energy. Accelerated lifetime tests by thermal cycling from -50° to +90°C are presented. Welds in Al6082-BK7 parts survive over the full temperature range where the ratio of thermal expansion coefficients is 3.4:1. Welds in Al6082-SiO2 parts (ratio 47.1:1) survive only a limited temperature range.
RESUMO
The relationships between rural health care and community development were examined over time, for the case-study area of Huron and Perth counties in Southwestern Ontario. The underlying premises were that an historical-geographic study could provide both a perspective on the development of rural health services and explore the interdependent relationship between rural community and health care. The research concentrated on examinations of the 2 key elements of rural health care, namely the rural practitioner and the community hospital. Detailed reconstruction revealed that, over time, both physicians and hospitals moved from a marginal to a central position and identity within the community, in parallel with the stages of community development in the 19th and 20th centuries, with hospitals emerging as major foci of rural sustainability. In the last 2 decades, the strength of the area's rural community health system was successfully marshalled to offset the potentially negative aspects of provincial health care restructuring. This reinforced both the perception and the reality of the interdependence of health services and communities in the predominantly rural area.