Optimal control of eutrophication processes in a moving domain

This work deals with an environmental problem related to controlling eutrophication inside a sensitive zone, by means of a regulation of the wastewater discharges in the region. After setting a detailed mathematical formulation of the optimal control problem posed on a free-boundary moving domain, we present several theoretical results on existence-regularity of optimal solutions, and their characterization by a first order optimality system. In the second part of the work a complete numerical algorithm for the resolution of the control problem is proposed, and several numerical examples are also given.     

Social capital as a driver of local knowledge exchange: a social network analysis

The objective of this paper is to take an in-depth look, from a network perspective, at the role that social capital plays in improving knowledge exchange between organizations. To do this, we consider the three dimensions of social capital: the structural dimension, as measured by the position of firms bridging structural holes; the relational dimension, as gauged by the level of trust and friendship in each relationship; and the cognitive dimension, as estimated by the presence of a shared culture. We also evaluate the level of organizational and human capital present in terms of the firms in the network. Empirical evidence has been gathered from the Madrid Science Park in Spain by applying the social network analysis methodology. The results show that the three dimensions of social capital play a significant role in increasing knowledge exchange in this network, while human and organizational capital differences are only significant for a sub-sample.     

Critical elements for product innovation at Portuguese innovative SMEs: an intellectual capital perspective

Knowledge Management Research & Practice - The general purpose of this research is to study interaction effects between intangible assets and product innovation. More specifically, the authors...     

The relationships among consumers’ ethical ideology,risk aversion and ethically-based distrust of online retailers and the moderating role of consumers’ need for personal interaction

Consumer distrust is only recently beginning to be perceived as an important e-commerce issue and, unlike online trust, the nature and role of distrust is much less established. This study examines the influence of two important consumer characteristics (ethical ideology and risk aversion) on consumer’s ethically-based distrust of online retailers. Also, the moderating role of consumer’s need for personal contact with sales staff is tested. Results from 409 online consumers confirm that both relativist-based ethical ideology and risk aversion are strongly and positively related to consumers’ distrust. Interestingly, our findings show that positive effects of relativism and risk aversion on consumer’s distrust are moderated by consumers’ need for personal interaction, which is more pronounced for those consumers with a high need for personal interaction with retail salespeople.     

Flawed heroes and great talents: the challenges associated with framing soccer legends in the NASL

The essay explores the ways that the North American Soccer Leagues (NASL) attempted to frame footballing stars in terms that North American fans would understand and embrace. The impetus for this approach was economic and influenced by the success of Pelé. However, the essay argues that the approach was deeply flawed and missed the obvious challenge of replacing Pelé – that he was irreplaceable. Nevertheless, the NASL and its boosters sought to position several stars as the natural successors to Pelé, including Franz Beckenbauer, George Best and Johan Curyff. The essay thus explores how these NASL stars were framed and how these frames would ultimately become limited.     

Return to play management after concussion in football: recommendations for team physicians

Abstract

A concussion is a rare but potentially serious injury of football players. Thus, an immediate and valid diagnosis, estimate of severity and therapeutic management is required. To summarise the published information on management of concussion with respect to a safe return to play (RTP), a literature search was conducted. Current guidelines on concussion in sports and significant studies on concussion in football were analysed. After concussion, management and RTP decision should remain in the area of clinical judgement on an individualised basis according to the current international guidelines. If a concussion is suspected, the player should not be allowed to RTP the same day. The RTP programme should follow a gradual step-wise procedure. A concussed player should not RTP unless he/she is asymptomatic and the neurological and neuropsychological examinations are normal. Untimely RTP bears an increased risk of sustaining another more severe brain injury and repetitive brain injury of long-term sequelae. In football, the management of concussion should primarily follow the recommendations proposed by the Concussion in Sports Group. Information and education of players and their medical and coaching team help to protect the players’ health. Future studies on concussion should include validated and detailed information on RTP protocols.     

Healthy Competition? The Public Interest in International Radiotelegraphy, 1919–1940

This article traces the definition of the public interest from the Navy Department through the FRC, to the FCC, with regard to the right mixture of competition and monopoly in international radiotelegraphy and identifies foreign policy as an important policy area where regulatory autonomy is enhanced. Policymakers defined the public interest independently of industry pressure because of internal divisions in the industry and, more importantly, because the strategic and international dimensions of the policy area brought the Navy Department into the regulatory mix and prompted the Commission to adopt a realist, rather than a liberal, framework.     

Orthographic learning in Spanish children

In order to read fluently, children have to form orthographic representations. Despite numerous investigations, there is no clear answer to the question of the number of times they need to read a word to form an orthographic representation. We used length effect on reading times as a measure, because there are large differences between long and short words for unknown words, differences that disappear when reading frequent words. Two lists of new words (half short and half long) were presented to 102 second‐grade to sixth‐grade Spanish children, to be read aloud six times. One of the lists was presented as part of a story and the other in isolation. Comparison of the length effect at the first and sixth exposure showed large differences between short and long words in the first presentation and small differences at the sixth presentation, indicating that Spanish children develop representations of words after just a few repetitions.     

A Critique of Educational Research

Abstract

Instrumentalist theories are older than liberal, reconstructionist or child‐centred ones and the concept of progress they embody seems very obvious at first sight: making schools and other educational institutions more relevant to social needs. In open market societies however social needs are even more fiercely contested than are intrinsic educational values or the needs of individual childen. When a social need is politically legitimated in newly closed societies, even resolute instrumentalists may blanch at what is required of schools, as Durkheim's disciples found in occupied France. In contemporary English‐speaking societies the paradox is noted that neo‐Marxists consider educational institutions to be instruments in the hands of the ‘ruling classes’ and to be part of an Ideological State Apparatus (ISA), whereas all those who may be defined as members of such ruling classes bemoan that these institutions are dysfunctional to the needs of industry and commerce and hostile to market societies.     

La enseñanza de la redacción desde el punto de vista didáctico

En este artículo se hace una reflexión en profundidad uniendo el proceso de enseñar en general al proceso específico de enseñanza de la redacción, que se configura como tarea interdisciplinar en torno a la escritura como eje integrador para lograr la unidad curricular. Esta reflexión se concreta en 10 prescripciones o sugerencias para la actuación.