Solar thermal power systems point-focusing thermal and electric applications projects. Volume 1: Executive summary

The activities of the Point-Focusing Thermal and Electric Applications (PETEA) project for the fiscal year 1979 are summarized. The main thrust of the PFTEA Project, the small community solar thermal power experiment, was completed. Concept definition studies included a small central receiver approach, a point-focusing distributed receiver system with central power generation, and a point-focusing distributed receiver concept with distributed power generation. The first experiment in the Isolated Application Series was initiated. Planning for the third engineering experiment series, which addresses the industrial market sector, was also initiated. In addition to the experiment-related activities, several contracts to industry were let and studies were conducted to explore the market potential for point-focusing distributed receiver (PFDR) systems. System analysis studies were completed that looked at PFDR technology relative to other small power system technology candidates for the utility market sector

Local mixture models of exponential families

Exponential families are the workhorses of parametric modelling theory. One reason for their popularity is their associated inference theory, which is very clean, both from a theoretical and a computational point of view. One way in which this set of tools can be enriched in a natural and interpretable way is through mixing. This paper develops and applies the idea of local mixture modelling to exponential families. It shows that the highly interpretable and flexible models which result have enough structure to retain the attractive inferential properties of exponential families. In particular, results on identification, parameter orthogonality and log-concavity of the likelihood are proved.Comment: Published at http://dx.doi.org/10.3150/07-BEJ6170 in the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm

It is Time to Stop Talking and Start Doing: The Views of People with Learning Disability on Future Research

There is a need for people with learning disabilities to be involved in directing research to ensure that the research is meaningful to those it concerns. This paper describes a scoping exercise to determine the research priorities for the field of learning disabilities for the next ten years. It focuses specifically on the role of people with learning disabilities in setting this research agenda and describes the methodology used, which involved a series of consultation workshops. Analysis of the data from these generated six priority themes: access to health care; getting good support; the right to relationships; housing options; work and personal finance; inclusion in the community. The findings showed that it is possible for people with learning disabilities to participate in setting a research agenda and there was agreement between the different stakeholders on the fundamental priorities. Moreover, the inclusion of people with learning disabilities provided a perspective that could not be adequately represented by other stakeholder groups. People with learning disabilities were concerned that research has a meaningful impact and can lead to demonstrable improvements in care. In order for this to happen there is a need for widespread dissemination of accessible outputs that reach the relevant stakeholders

Asymptotic coverage probabilities of bootstrap percentile confidence intervals for constrained parameters

The asymptotic behaviour of the commonly used bootstrap percentile confidence interval is investigated when the parameters are subject to linear inequality constraints. We concentrate on the important one- and two-sample problems with data generated from general parametric distributions in the natural exponential family. The focus of this paper is on quantifying the coverage probabilities of the parametric bootstrap percentile confidence intervals, in particular their limiting behaviour near boundaries. We propose a local asymptotic framework to study this subtle coverage behaviour. Under this framework, we discover that when the true parameters are on, or close to, the restriction boundary, the asymptotic coverage probabilities can always exceed the nominal level in the one-sample case; however, they can be, remarkably, both under and over the nominal level in the two-sample case. Using illustrative examples, we show that the results provide theoretical justification and guidance on applying the bootstrap percentile method to constrained inference problems.Comment: 22 pages, 6 figure

Entrepreneurship and UK doctoral graduates

Copyright c 2011 IP Publishing Ltd. Reproduced by permissionThis paper discusses the experience of UK doctoral graduates in pursuing entrepreneurial careers: there is evidence that this applies to a substantial number - about 10% - of doctoral graduates. The nature of their experience was explored using 37 interviews with doctoral entrepreneurs. The research was funded by Vitae (www.vitae.ac.uk), an organization championing the personal, professional and career development of doctoral researchers and research staff in UK higher education. The stories that the participants tell suggest that doctoral entrepreneurship develops out of a complex interaction between the personality and skills of the entrepreneurs and the environment in which they operate. In particular, the authors argue that the participants have mobilized a mix of financial, social and educational capital in order to create and sustain their enterprises successfully