Enhancing the Performance of the T-Peel Test for Thin and Flexible Adhered Laminates

Symmetrically bonded thin and flexible T-peel specimens, when tested on vertical travel machines, can be subject to significant gravitational loading; with the associated asymmetry and mixed-mode failure during peeling. This can cause erroneously high experimental peel forces to be recorded which leads to uncertainty in estimating interfacial fracture toughness and failure mode. To overcome these issues, a mechanical test fixture has been designed for use with vertical test machines, that supports the unpeeled portion of the test specimen and suppresses parasitic loads due to gravity from affecting the peel test. The mechanism, driven by the test machine cross-head, moves at one-half of the velocity of the cross-head such that the unpeeled portion always lies in the plane of the instantaneous center of motion. Several specimens such as bonded polymeric films, laminates, and commercial tapes were tested with and without the fixture, and the importance of the proposed T-peel procedure has been demonstrated

Patients' age as a determinant of care received following acute stroke: A systematic review

<p>Abstract</p> <p>Background</p> <p>Evidence-based care should improve acute stroke outcomes with the same magnitude of effect for stroke patients of all ages. However, there is evidence to suggest that, in some instances, older stroke patients may receive poorer quality care than younger patients.</p> <p>Our aim was to systematically review evidence of the quality of care provided to patients with acute stroke related to their age. Quality of care was determined by compliance with recommended care processes.</p> <p>Methods</p> <p>We systematically searched MEDLINE, CINAHL, ISI Web of Knowledge, Ageline and the Cochrane Library databases to identify publications (1995-2009) that reported data on acute stroke care process indicators by patient age. Data extracted included patient demographics and process indicator compliance. Included publications were critically appraised by two independent reviewers using the Critical Appraisal Skills Programme tool, and a comparison was made of the risk of bias according to studies' findings. The evidence base for reported process indicators was determined, and meta-analysis was undertaken for studies with sufficient similarity.</p> <p>Results</p> <p>Nine from 163 potential studies met the inclusion criteria. Of the 56 process indicators reported, eleven indicators were evidence-based. Seven of these indicators (64%) showed significantly poorer care for older patients compared to younger ones, while younger patients received comparatively inferior care for only antihypertensive therapy at discharge. Our findings are limited by the variable methodological quality of included studies.</p> <p>Conclusion</p> <p>Patients' age may be a factor in the care they receive after an acute stroke. However, the possible influence of patients' age on clinicians' decision-making must be considered in terms of the many complex issues that surround the provision of optimal care for older patients with acute stroke.</p

The Winner’s Curse of Human Capital

We extend a model developed by Evans and Jovanovic (1989) to explain when start-ups are credit constrained. We show that the magnitude of the credit constraint is conditioned by the relative productivity of human capital in both wage work and self-employment. The effect of predicted household income on start-up capital is used to indicate the existence of financial constraint. Empirical analysis reveals that entrepreneurs with high human capital have both greater financial wealth and greater levels of start-up capital pointing to the endogenous nature of credit constraints. High human capital relaxes financial constraints, apparently due to greater productivity of human capital in wage work than in self-employment. Those who are the least likely to be credit constrained in self-employment are those that are least likely to switch into self-employment,and vice versa. Copyright Springer Science + Business Media, Inc. 2005

The Winners Curse of Human Capital

We extend a model developed by Evans) to explain when start-ups are credit constrained. We show that the magnitude of the credit constraint is conditioned by the relative productivity of human capital in both wage work and self employment. Empirical analysis reveals that entrepreneurs with greater levels of human capital and entrepreneurial abilities have both greater financial wealth and greater levels of start-up capital pointing to the endogenous nature of credit constraints. Start-ups are generally financially constrained when measured by the impact on start-up capital of predicted household income. Greater levels of human capital relaxes financial constraints, apparently due to greater productivity of human capital in wage work than in self-employment. Paradoxically, then, those who are the least likely to be credit constrained in self-employment are those that are least likely to switch into self-employment, and vice versa.CES,economic,research,micro,data,microdata,chief,economist

Some Problems in using Diffusion Models for New Products

This paper analyzes some of the problems involved in using diffusion models to formulate marketing strategies for introducing new products. Though future work in this area appears justified, there are many unresolved problems which limit application. First, there is no theory for adoption and diffusion processes. Such a theory is outlined in this paper. Secondly, the present models are too restrictive and do not include the variables that a marketing manager has at his disposal. Six models which remove some of the theoretical and methodological restrictions are therefore presented. The marketing implications of the assumptions in the models are discussed.