Giant electrocaloric effect of highly (1 0 0)-oriented 0.68PbMg1/3Nb2/3O3–0.32PbTiO3 thin film

PbZr_0.95Ti_0.05O₃ thin film has the highest electrocaloric properties of all the oxide thin films (0.48?K?V^?1). Here, it is shown giant electrocaloric properties in 200?nm (1?0?0)-oriented PMN–PT 68/32 film near the ferroelectric Curie temperature of 146?°C. The results indicate the significance of this system to achieve electrocaloric entropy change and temperature change, up to 32.21?J/kg?°C and 14?K, respectively, in 12?V (i.e. 1.155?K?V^?1) near the Curie point. This exceeds the previous best results obtained in PbZr_0.95Ti_0.05O₃ thin film.     

Evolutionary Pluralism: A New System of Systems Philosophy

When Darwin wrote his ‘On the origin of species…” (1859) he focused on evolution as a property of living organisms in interaction with abiotic and biotic elements in the world. This viewpoint is still dominant amongst biologists. For particle physicists and cosmologists evolution refers to a larger scale, ranging from quarks and atoms to galaxies, stars and planets (i.e. Pagels 1985, Hawking 1988). To close the gap between such different viewpoints, a wide range of perspectives on an interdisciplinary understanding of system development has been published (i.e. Teilhard de Chardin 1966, von Bertalanffy 1968, Varela 1979, Prigogine and Stengers 1984, Laszlo 1996). As an integrative concept, the construction of nature from a hierarchy of system layers forms a central tenet in general system research and the stepwise construction of this layered hierarchy can be regarded as an interdisciplinary evolution theory. Surprisingly, the literature offers no unequivocal rules to recognise a multilayer hierarchy in nature. This presents an obstacle for interdisciplinary approaches to evolution.

Searching a solution to part of the above hierarchy problem, the present paper is dedicated to the analysis of a special kind of layering in natural systems, which is based on transitions between ‘building block’ systems. To identify these building blocks, and the transitions from building block x at level A, to building block y at level B, the focus of this study is further limited to ‘hypercydic dynamics’ and ‘containment’. On the basis of these criteria, a hierarchy is created which shows no possibilities for ‘bypasses’. It connects hadrons to atoms, atoms to cells, and cells to neural networks. Implications of this hierarchy for system studies and evolution are discussed.     

The great transition: A process view of history and its implications

The collapse of confidence since the nineteenth century, and the turbulence which has followed, are incorporated in an historical model describing the development of western civilization. It suggests that they are threshold symptoms of a forthcoming transition of profound importance and without earlier parallel. Three different, and not mutually exclusive perceptions of the transition are provided. There is no suggestion that we can anticipate what will happen, but recent rapid advances in communications and information technologies are likely to play a critical formative part in a development which will involve both a growth in collective self‐consciousness and the conceptual expansion of our minds.     

Using Relational-Cultural Theory to Conceptualize International Student Transitions

ABSTRACT

In this article, Relational-Cultural Theory (RCT) is applied to international student transition experiences. The purpose of this phenomenological study was to describe the lived experiences of international students transitioning to college life in the rural United States using the principles of RCT. Five women and four men enrolled at a mid-sized university agreed to participate in the study. In the data analysis phase, four components of RCT emerged as themes. The authors provide implications for campus-based mental health professionals (e.g., college counselors).     

Staying and Returning dynamics of young children's attention

In this paper, we decompose selective sustained attending behavior into components of continuous attention maintenance and attentional transitions and study how each of these components develops in young children. Our results in two experiments suggest that changes in children's ability to return attention to a target locus after distraction (“Returning”) play a crucial role in the development of selective sustained attention between the ages of 3.5–6 years, perhaps to a greater extent than changes in the ability to continuously maintain attention on the target (“Staying”). We further distinguish Returning from the behavior of transitioning attention away from task (i.e., becoming distracted) and investigate the relative contributions of bottom-up and top-down factors on these different types of attentional transitions. Overall, these results (a) suggest the importance of understanding the cognitive process of transitioning attention for understanding selective sustained attention and its development, (b) provide an empirical paradigm within which to study this process, and (c) begin to characterize basic features of this process, namely its development and its relative dependence on top-down and bottom-up influences on attention.

Research Highlights

• Young children exhibited an endogenously ability, Returning, to preferentially transition attention to task-relevant information over task-irrelevant information.
• Selective sustained attention and its development were decomposed into Returning and Staying, or task-selective attention maintenance, using novel eye-tracking-based measures.
• Returning improved between the ages of 3.5–6 years, to a greater extent than Staying.
• Improvements in Returning supported improvements in selective sustained attention between these ages.

     

Self-imaging: beyond children’s and adolescents’ self-image / El Self imaginando-se: más allá de la autoimagen de niños y adolescentes

Abstract

This article documents the case studies of two Brazilian children aged 10 and 11, for whom drawing is a symbolic tool of self-meaning. Semi-structured interviews were methodologically carried out from drawings they had created previous to and during the interview. Using semiotic cultural psychology as a reference, the concept of Self-imaging is put forward as an alternative to the self-image construct, highlighting the active role of the subject in the construction of his/her life trajectory. Results suggest that the transition process to adolescence represents a challenge in which young people recreate images of themselves by projecting new possibilities of action in the world through their imagination.     

A typological approach of perceived resource fluctuations after job transitions in a representative panel study

ABSTRACT

Job and career transitions are unique experiences that vary within and between persons. One possible reason for the differential effects of transitions is that they can involve resource gains, losses, conservation, or a combination thereof. This study investigates perceived resource fluctuation patterns as possible reasons for differential health outcomes in a representative German panel study (n = 2296). Participants compared six characteristics of their new job with their previous one in three categories (better, same, or worse): (1) job security, (2) working hour regulations, (3) workload, (4) use of professional knowledge, (5) advancement opportunities, and (6) earnings. We conducted multilevel latent class analyses (LCA) with mental and physical health as distal outcomes. Results showed a four-class solution with different probabilities of endorsing that job conditions have fluctuated after the transition. Results also indicated important nuances between the latent classes in terms of mental and physical health outcomes. This study adds to a growing body of knowledge concerning the important role resource fluctuations, and the interplay of various resource dynamics play in the sustenance of mental and physical health. Results also provide implications for career guidance, as well as dealing with organizational newcomers to ensure their well-being, and therefore also their performance.