Mechanical testing of polyurethane foams to cover lower limb prostheses

Despite the aesthetic and functional importance of foam cosmeses, the foam mechanical behaviour has not been quantified in the literature. This paper reports the results of testing two commonly used foams to determine their material properties. The works aims to enable the FEA modelling of cosmeses

Health outcomes for children born to teen mothers in Cape Town, South Africa

This paper analyzes the effect of being born to a teen mother on child health outcomes in South Africa using propensity score reweighting. Exploiting the longitudinal nature of the Cape Area Panel Study, we estimate the probability of being a teen mother conditional on pre-childbirth characteristics. We use this score to construct a weighted counterfactual group of children born to mothers over nineteen whose pre-childbirth characteristics are very similar to the teen mother sample except for their age at the birth of their first child. Our reweighted regressions indicate that being born to a teen mother has some significant adverse effects on child health, especially among Coloured children. In particular, children born to teens are more likely to be underweight at birth and to be stunted with the negative effect being double the size for Coloureds than Africans. No negative impact of teenage childbearing is found on head circumference at birth or the incidence of incomplete first year immunizations. These results remain robust even when we simulate influential unobservable effects in both the reweighting equation and the outcome equation.

Mentoring undergraduate civil engineering students

On enrolment at university, undergraduate civil engineering students begin their journey towards a professional career. Associating with graduate engineers throughout their studies provides students with potential role models and assists them to accustom progressively to the industry. Whilst the procurement of guest practitioners to deliver workshops and lectures remains buoyant, opportunities for students to secure summer placements within the civil engineering sector, has been problematic since the 2008 financial crisis. Graduate mentoring of student mentees can help to bridge the shortage of vocational placements. This paper discusses the results from a graduate mentoring initiative involving third year (n=345) civil & environmental engineering (CEE) student mentees, 83 graduate mentors and 31 employers. The results show that the student mentees overwhelmingly support and validate the opportunities that this initiative has provided. On completion of their mentoring meetings, and on return to their fourth year of their studies, the majority of the students commit to making behavioural and attitudinal changes regarding their own continued professional development (CPD)

Explaining the persistence of racial gaps in schooling in South Africa

This paper analyses the large racial differences in progress through secondary school in South Africa using recently collected longitudinal data. Following the progress of students who were enrolled in Grades 8 and 9 in 2002 in the Cape Area Panel Study, we document large differences in the probability of grade advancement between white, coloured, and African youth. Probit regressions indicate that grade advancement between 2002 and 2005 is strongly associated with household income and with respondents’ scores on a baseline literacy and numeracy test. We fully explain the white and coloured advantage over Africans in progress through school when we control for baseline test scores, previous grades failed, and per capita household income. The results suggest that the early disadvantage of African secondary students is a major factor driving poor progress through secondary school, with continued racial gaps in grade progression contributing to persistent racial gaps in ultimate schooling attainment. These key results do not change when we re-estimate these equations separately by race and conduct our statistical tests across these equations or even when we conduct post-estimation counterfactual simulations or propensity score matching. As a final check we add a set of school specific factors to the probit regressions by race. These factors are not statistically significant in the models; their introduction only marginally reduces the importance of the baseline test scores and previous grades failed and they are not important in the counterfactual analysis. All in all the paper provides very strong evidence that knowledge accumulated by Grade 8 or 9 is a critical determinant of progress through secondary school and that the equalizing of secondary school quality is unlikely to eliminate racial gaps in grade progression without improvements at earlier grades

Depositional history and archaeology of the central Lake Mungo lunette, Willandra Lakes, southeast Australia

Lake Mungo, presently a dry lake in the semi-arid zone of southeastern Australia, preserves a unique record of human settlement and past environmental change within the transverse lunette that built up on its downwind margin. The lunette is \u3e30 km long and the variable morphology along its length suggests spatial variability in deposition over time. Consequently this presents differential potential for the preservation of past activity traces of different ages along the lunette. Earlier work at Lake Mungo focused primarily on the southern section of the lunette, where two ritual burials of considerable antiquity were found. Here we describe the depositional history of the central section of the Lake Mungo lunette, together with the first single grain optically stimulated luminescence (OSL) chronology of the full stratigraphic sequence and of three hearths. We thereby lay the foundation for systematic investigation of the distribution of archaeological traces through the sedimentary record. The older depositional units (Lower and Upper Mungo) were deposited ca. 50–40 ka and ∼34 ka respectively, and are substantially thinner in the central section of the lunette compared with the south. By contrast, the overlying unit of interbedded sands and clayey sands (Arumpo–Zanci units), deposited ca. 25–14 ka, is markedly thicker and dominates the stratigraphic sequence in the central portion of the lunette. Although the sequence broadly reflects previous models of the lunette\u27s depositional history and changing hydrological conditions, our results indicate spatially variable deposition of sediments, possibly as a result of changes in prevailing wind regimes. Archaeological traces are exposed in all stratigraphic units deposited after ca. 50 ka, including sediments deposited after the final lake drying ca. 15 ka, indicating human occupation of the area under a range of palaeoenvironmental conditions. Dating and stratigraphical examination of individual hearth features demonstrates that even within individual stratigraphic units, human occupation persisted under variable conditions. Mid-Holocene occupation of the area following the final lake retreat took place during a period of relatively humid climate

The matric certificate is still valuable in the labour market

Increasing levels of youth unemployment and learners’ poor performance at school have led to claims that the matric certificate no longer has much value in the labour market. However, the evidence does not support this claim. While the labour market conditions facing secondary school graduates have indeed worsened with time, the value of a matric certificate relative to that of grade 10 and 11 has remained positive both in terms of earnings and the likelihood of finding employment

(Un-) healthy ageing: Geographic inequalities in disability-free life expectancy in England and Wales

Health expectancies are an indicator of healthy ageing that reflect quantity and quality of life. Using limiting long term illness and mortality prevalence, we calculate disability-free life expectancy for small areas in England and Wales between 1991 and 2011 for males and females aged 50–74, the life stage when people may be changing their occupation from main career to retirement or alternative work activities. We find that inequalities in disability-free life expectancy are deeply entrenched, including former coalfield and ex-industrial areas and that areas of persistent (dis-) advantage, worsening or improving deprivation have health change in line with deprivation change. A mixed health picture for rural and coastal areas requires further investigation as do the demographic processes which underpin these area level health differences