Interplay of domain structure and phase transitions: theory, experiment and functionality

Domain walls and phase boundaries are fundamental ingredients of ferroelectrics and strongly influence their functional properties. Although both interfaces have been studied for decades, often only a phenomenological macroscopic understanding has been established. The recent developments in experiments and theory allow to address the relevant time and length scales and revisit nucleation, phase propagation and the coupling of domains and phase transitions. This review attempts to specify regularities of domain formation and evolution at ferroelectric transitions and give an overview on unusual polar topological structures that appear as transient states and at the nanoscale. We survey the benefits, validity, and limitations of experimental tools as well as simulation methods to study phase and domain interfaces. We focus on the recent success of these tools in joint scale-bridging studies to solve long lasting puzzles in the field and give an outlook on recent trends in superlattices.

Sustainable Transitions of Urban Projects towards Mitigation and Adaptation Projects for Climate Change: The case of Medellin

The research investigates the relationship between cities and climate change by examining how urban projects shifted to mitigation and adaptation for climate change at an urban scale. The article is based upon two complementary approaches, a multilevel analysis from sustainable transitions theory and a framework of interrelations of urban mitigation and adaptation projects. The methodological design is a case study; we analyzed the case of Medellin that, at the beginning of the 2000's, implemented public transport projects, urban parks, educational and cultural facilities, and risk mitigation projects in the surrounding hills. The main findings are that specific projects at an urban scale are operating as niches or experiments, taking advantage of windows of opportunities, and triggering changes in the urban design routines, framing a new sociotechnical system. It is found that governance, leadership, teams of experts and urban planners are drivers for the transition of urban projects, which were initially designed for social and transport needs, to urban mitigation projects for climate change. At the same time, urban mitigation projects such as the Metropolitan Green Belt are transiting to adaptation projects for climate change. The conclusion for this case study is that while most urban projects retain their traditional role, a new generation of projects with mitigation and adaptation features is emerging in the context of climate change. This article contributes to expanding the empirical analysis of the literature on the theory of sustainable transitions specifically related to cities and urban projects. The theoretical framework of urban projects and their linkages with climate change are enriched. The conceptual framework of the analysis is replicable and useful for practitioners in the field of urban design and researchers interested in comparisons to identify patterns or typologies. In addition, the article contributes to sensitize actors involved in public urban design policies in their roles as managers of transitions.

Opening Up The Tools For Doing Science: The Case Of The Global Open Science Hardware Movement

Open science hardware (OSH) is a term frequently used to refer to artifacts, but also to a practice, a discipline and a collective of people worldwide pushing for open access to the design of tools to produce scientific knowledge. The Global Open Science Hardware (GOSH) movement gathers actors from academia, education, the private sector and civil society advocating for OSH to be ubiquitous by 2025. This paper examines the GOSH movement’s emergence and main features through the lens of transitions theory and the grassroots innovation movements framework. GOSH is here described embedded in the context of the wider open hardware movement and analyzed in terms of framings that inform it, spaces opened up for action and strategies developed to open them. It is expected that this approach provides insights on niche development in the particular case of transitions towards more plural and democratic sociotechnical systems.

Transitional nursing care for older inpatients: a person-centred research programme

Across the Western world, healthcare services are contending with the challenge of ageing populations. Switzerland is no exception, and faces the need to adapt its healthcare system to the needs of older persons. A disease-oriented approach is ill suited to the varied abilities, preferences and degrees of resilience among older people, and person-centred care is better placed to respond effectively to this situation (Ekman et al., 2013). Our team at the Institute of Higher Education and Research in Healthcare (IUFRS) of the University of Lausanne has developed a research programme to improve the healthcare experiences of older persons during hospitalisation and transition to discharge. We have identified different models and theories that promote a better understanding of the factors that impact on older persons ’lives during these phases and of how to take them into account in nursing practice in order to encourage a person-centred approach. The transition of care from hospital to home is a vulnerable time in the continuum of care for older persons (Arbaje et al., 2014). Transitional care is defined by Coleman and Boult (2003, p 549) as a ‘set of actions designed to ensure the coordination and continuity of healthcare as patients transfer between different locations or different levels of care within the same location’. At the theoretical level, Meleis ’transitions theory (2000) provides a perspective for interpreting and planning comprehensive discharge for hospitalised older persons. In designing our research programme, this theory helped us to link the older person’s health problems (conditions of transition) in relation to hospitalisation (nature of transition), discharge preparation (nursing interventions) and the effects on the person (response models) (Mabire et al., 2015). From the transitions theory, Naylor et al. (2017) developed their transitional care model to guide nursing practice during this period. This model includes eight components: Patient engagement Caregiver engagement Complexity and medication management Patient education Caregiver education Patient and caregiver wellbeing Care continuity Accountability

Rooftop PV and the Renewable Energy Transition; a Review of Driving Forces and Analytical Frameworks

Rooftop solar photovoltaics (PV) are accelerating the transition towards low carbon electricity systems in many countries, particularly in Australia. This review paper provides an overview of the (1) technical, (2) economic, (3) socio-political, and (4) regulatory and institutional aspects that should be considered concurrently when navigating the transition towards a rooftop PV-dominated electricity system. We consider the suitability of two prominent long-range transitions theories for understanding the importance and interaction of elements within these four aspects during the transition. The multi-level perspective (MLP) of transitions theory is considered best suited for this task as it addresses fundamental shifts in the socio-technical systems, rather than being weighted towards technological and/or economic solutions. We find that relatively little research has been undertaken where the renewable energy transition is being driven by the uptake of rooftop PV within the distribution network of established islanded electricity systems. These islanded electricity systems will be the first to experience system impacts from high levels of rooftop PV. This review provides further analysis of important gaps in understanding the rooftop-PV-led energy transition and the implications for policy makers in maintaining stable electricity supplies during the transition.

The weird eusociality of polyembryonic parasites

Some parasitoid wasps possess soldier castes during their parasitic larval stage, but are often neglected from our evolutionary theories explaining caste systems in animal societies. This is primarily due to the polyembryonic origin of their societies. However, recent discoveries of polyembryonic trematodes (i.e. flatworms) possessing soldier castes require us to reconsider this reasoning. I argue we can benefit from including these polyembryonic parasites in eusocial discussions, for polyembryony and parasitism are taxonomically vast and influence the evolution of social behaviours and caste systems in various circumstances. Despite their polyembryony, their social evolution can be explained by theories of eusociality designed for parent–offspring groups, which are the subjects of most social evolution research. Including polyembryonic parasites in these theories follows the trend of major evolutionary transitions theory expanding social evolution research into all levels of biological organization. In addition, these continued discoveries of caste systems in parasites suggest social evolution may be more relevant to parasitology than currently acknowledged.