The role of parental investments for cognitive and noncognitive skill formation : evidence for the first 11 years of life. 'El papel de la influencia de los padres en el desarrollo cognitivo y la formación de habilidades cognitivas : evidencias de los primeros 11 años de vida'.

Resumen basado en el de la publicación

Measuring the benefits of employer investments in training : towards a new economic theory of training. 'Medir los beneficios de las inversiones del empresario en formación : hacia una nueva teoría económica de la formación'.

Resumen basado en el de la publicación

On the electrical properties of insulation oils

Insulating oils are a major component of high voltage plant, including transformers, switchgear and cables. Consequentially, in terms of plant failure, changes in the electrical characteristics of the oil during ageing are of crucial importance. To address this issue, commercial insulating oil was subjected to controlled ageing under laboratory conditions. The electrical properties of the aged oils were then characterized using dielectric spectroscopy. The data suggest that a degree of electrical conductivity occurs in the aged oils, which reduces the insulating properties of the oil as ageing proceeds. The role of atmosphere and additives on the electrical properties of the oils were also explored. Results are compared with model samples, which contain known amounts of materials that may occur as by-products of the ageing process.