Modeling material failure with a vectorized routine

The computational aspects of modelling material failure in structural wood members are presented with particular reference to vector processing aspects. Wood members are considered to be highly orthotropic, inhomogeneous, and discontinuous due to the complex microstructure of wood material and the presence of natural growth characteristics such as knots, cracks and cross grain in wood members. The simulation of strength behavior of wood members is accomplished through the use of a special purpose finite element/fracture mechanics routine, program STARW (Strength Analysis Routine for Wood). Program STARW employs quadratic finite elements combined with singular crack tip elements in a finite element mesh. Vector processing techniques are employed in mesh generation, stiffness matrix formation, simultaneous equation solution, and material failure calculations. The paper addresses these techniques along with the time and effort requirements needed to convert existing finite element code to a vectorized version. Comparisons in execution time between vectorized and nonvectorized routines are provided

Connecting elders by facilitating mobility

A key aspect of staying connected is the ability to travel and visit friends and family, yet mobile situations often pose difficulties for the older population. In this paper, we discuss how technology can support older people on the move, describing work which we have done and are doing in this area and outlining some of the challenges that lie ahead. We focus on providing support for navigation, which is a key part of travel, and outline some of the results of our work, showing that electronic aids can effectively help older people with this activity

Estimating Column Density in Molecular Clouds with FIR and Sub-mm Emission Maps

We have used a numerical simulation of a turbulent cloud to synthesize maps of the thermal emission from dust at a variety of far-IR and sub-mm wavelengths. The average column density and external radiation field in the simulation is well matched to clouds such as Perseus and Ophiuchus. We use pairs of single-wavelength emission maps to derive the dust color temperature and column density, and we compare the derived column densities with the true column density. We demonstrate that longer wavelength emission maps yield less biased estimates of column density than maps made towards the peak of the dust emission spectrum. We compare the scatter in the derived column density with the observed scatter in Perseus and Ophiuchus. We find that while in Perseus all of the observed scatter in the emission-derived versus the extinction-derived column density can be attributed to the flawed assumption of isothermal dust along each line of sight, in Ophiuchus there is additional scatter above what can be explained by the isothermal assumption. Our results imply that variations in dust emission properties within a molecular cloud are not necessarily a major source of uncertainty in column density measurements.Comment: Accepted to ApJ Letter

Regional and Racial Variation in Health Care Among Medicare Beneficiaries

Focuses on variations in healthcare delivery and outcomes among and within hospital service areas, in addition to racial and geographic disparities, as measured by five indicators. Discusses variations in spending and considers implications for reform

Early quantitative evidence on the impact of the pathways to work pilots

Since October 2003 the Department for Work and Pensions (DWP) has been piloting reforms in England, Scotland and Wales which provide greater support alongside greater obligations to encourage many new claimants of incapacity benefits to move into paid work. The Pathways to Work package of reforms includes: a series of usually mandatory workfocused interviews; programmes designed to boost claimants' prospects of being able to work; and increased financial incentives for individuals to enter paid employment. As part of a quantitative assessment of the impact of the programme, a telephone survey of those making an initial enquiry to Jobcentre Plus about claiming incapacity benefits was conducted in both pilot and comparison areas before and after the pilots were implemented. This report focuses on the differences in some early quantitative outcomes between Pathways and non-Pathways areas. Two empirical techniques are used to investigate the early impact of the pilots on employment, earnings, receipt of incapacity benefits, and a potential indicator of the extent to which individuals' health affects their everyday activities. The analysis was undertaken by researchers at the Institute for Fiscal Studies and the telephone interviews were undertaken by the National Centre for Social Research. All these findings are preliminary: more comprehensive analysis will be conducted in later stages of the evaluation. This report analyses outcomes at a time shortly after the pilots started. Further analysis of outcomes will assess Pathways to Work using survey and administrative data from a later cohort and will examine outcomes over a longer period of time