Lifelong learning is a commonly espoused quality of university graduates (Candy et al 1994). However even a cursory consideration of the literature reveals a bewildering array of definitions and assumed meanings attached to the term. Such confusion is of course not limited to this particular graduate quality. There have been repeated calls (see for example Clanchy & Ballard 1995, Holmes 2000) f...

I think, like the reviewer of Bruce Ballard 's previous paper, that he wants the moon. However , as one who has tried, for the purposes of lecturing, to extract concrete system descriptions with workedthrough examples f rom published material , I think he is right to call for bet ter standards. Alan Bundy (1981) has made a similar appeal for AI in general. I t ' s impor tant , in part icular, t...

Fig. 1: Power electronics system driving ac load, powered by a fuel cell. Abstract—A dynamic model of a PEM fuel cell is developed for power electronics simulation. The model accounts for static losses of activation, ohmic, and concentration regions, and dynamic transients due to charge double layer and compressor delay. In this paper, study was given to additional factors, including temperatur...

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The development of a generalized steady-state electrochemical model of a polymer electrolyte fuel cell or proton exchange membrane fuel cell (PEMFC) system is presented by R.F Mann et al. to predict the output voltage of a single Ballard Mark V cell as a function of the major variables like current density, pressure of the reactant gases and working temperature more efficiently (Mann et al. 200...

BACKGROUND Documentation of superfoetation is extremely rare in humans., The younger foetus has invariably been small for gestational age (estimated from the date of the last menstrual bleed) in all the cases reported in the literature. We report a case where the younger twin was of appropriate size for gestation. CASE PRESENTATION The first of twins was of 32 weeks gestation and the baby was...

Hydrogen is one of the modern energy carriers, but its storage and practical use newest hydrogen technologies in real operation conditions still a task future investigations. This work describes experimental hybrid system (HHS). HHS part laboratory off-grid that stores electricity gained from photovoltaic panels (PVs). includes production units NEXA Ballard low-temperature proton-exchange membr...

This issue of Philosophical Transactions examines the relationship between scientific uncertainty about climate change and knowledge. Uncertainty is an inherent feature of the climate system. Considerable effort has therefore been devoted to understanding how to effectively respond to a changing, yet uncertain climate. Politicians and the public often appeal to uncertainty as an argument to del...