On Self-Organized Criticality and Synchronization in Lattice Models of Coupled Dynamical Systems

Lattice models of coupled dynamical systems lead to a variety of complex behaviors. Between the individual motion of independent units and the collective behavior of members of a population evolving synchronously, there exist more complicated attractors. In some cases, these states are identified with self-organized critical phenomena. In other situations, with clusterization or phase-locking. The conditions leading to such different behaviors in models of integrate-and-fire oscillators and stick-slip processes are reviewed.Comment: 41 pages. Plain LaTeX. Style included in main file. To appear as an invited review in Int. J. Modern Physics B. Needs eps

Policy Environments and Institutional Factors that Shape the Role of Technology in Entrepreneurial Culture: An Exploratory Study in Mexico and Canada

In this paper we present a comparative study of entrepreneurship in Mexico and Canada, based on the study of the role of technology and innovation in entrepreneurial activity. The aim of the paper is to highlight similarities and differences in the perceptions of entrepreneurs about environmental and policy factors that affect their business opportunities, in order to better understand their role, and to derive policy implications that may be useful in advancing technological innovation in Mexico

Revisiting diversity and difference in early childhood through children’s news media

Children’s access to certain knowledge, often deemed inappropriate for children by adults, has been at the core of many controversies in children’s early education. This is particularly the case in terms of the censorship associated with children’s access to what has been broadly viewed as ‘difficult knowledge’ – bodies of knowledge pertaining to sexuality, death, war, poverty, and violence, for example. In some western countries, the discourse of childhood innocence has been a powerful mediator/regulator of children’s access to knowledge and has influenced how children are viewed as active citizens in their everyday lives (Robinson, 2013). However, it is now more widely accepted that children are competent, knowing beings in and of the world, readily taking up, processing and challenging messages about a raft of uncomfortable and inequitable realities, from global warming, to sexism, to racial intolerance, to class prejudice (Osgood et al., 2016). This view of children and childhood requires that approaches to pedagogy, policy and practice around diversity and difference in early childhood education attend to children as knowers and doers in the world (Osgood, 2012; Osgood and Robinson, 2019; Robinson and Jones Díaz, 2016)

Comparative environmental assessment of two materials suited to central tower CSP technology

Compatibility of containment materials with molten salt thermal storage media is a significant technical challenge for Concentrating Solar Power plants. Metal alloys in contact with molten salt must have a specific behavior, mechanical properties and resistance to degradation processes that allow them to operate at temperatures above 500 °C, being both respectful to the environment. Firstly, this study presents two types of specific materials to operate at raised temperatures in Concentrating Solar Power plants, particularly the central tower technology. The materials are AISI 347H stainless steel and the Ni-based alloy HRSA INCONEL 617. Then, a Life Cycle Assessment shows the influence and contribution to different impact categories from the elements that compose both metals, demonstrating that materials that provide better mechanical properties could have environmental shortcomings. This paper aims to contribute to an improved understanding of the environmental implications of these materials and which is the best choice in terms of sustainability. The results showed better environmental behavior in the AISI 347H case against INCONEL 617.Publicad