The analytical approximate technique developed by Wu et al. for conservative oscillators with odd nonlinearity is used to construct approximate frequency-amplitude relations and periodic solutions to the relativistic oscillator. By combining Newton's method with the method of harmonic balance, analytical…

Prediction capacity of three main shoot population dynamics methods (age structure, net shoot recruitment per plagiotropic rhizome and shoot census) have been tested for a period of four years (2002–2006) on a Posidonia oceanica meadow. Accuracy of each method was…

In this work we present a reactive autonomous robot navigation system based only on omnidirectional vision. It does not rely on any prior knowledge about the environment apart from assuming a structured one, like indoor corridors or outdoor avenues. The…

Objective: To explore the opinions of stakeholders on the potential of taxes or subsidies, as measures for tackling obesity in Europe. Design: Structured interviews using Multi-criteria Mapping, a computer based decision support tool. Subjects/Setting: 189 interviewees, drawn from 21 different…

Changes in the presynaptic inhibition of spinal alpha-motoneurons were studied in
athletes during motor activities of different types. In the state where muscles were at
relative rest, the presynaptic inhibition of spinal alpha-motoneurons of the m. soleus
was stronger in…

We propose a new algorithm to obtain the color matching functions of any digital camera, with correct weights and white balance, from the relative scaling of their complete (3-D) spectral sensitivities obtained from real spectroradiometric data. Thanks to this algorithm,…

This paper analyzes the efforts made by the Telefonica Group (the main Spanish firm in the telecommunications sector) to evolve from a bureaucratic culture to another oriented towards total quality and the customer. The need for this change came as…

This paper describes a novel approach for affine invariant region detection and description. At the detection stage, a hierarchical clustering mechanism is employed to group image pixels into regions. This process is based on the Bounded Irregular Pyramid (BIP) and…

Fianoniella stenognatha sp. n. from the Columbretes Islands (Castellón, Spain) is described and illustrated. The new species is distinguished by its longer and narrower mandibles with parallel or divergent rims in the apical half, wider clypeus, hind ocelli more separated…

The precipitation of gypsum during the intrusion of seawater in a coastal aquifer is shown to be a possible cause of the decrease of the sulphate concentration with respect to the conservative freshwater / seawater mixing observed in many field…