Search results for: Søren Hagstrøm

Authors: Cecilie W. Bang, Camila B. Laursen, Charlotte N. Eggertsen, Søren Hagstrøm, Helle Haslund-Thomsen, Sine Agergaard

Abstract:

Childhood and adolescence are periods characterized by significant bodily changes, particularly puberty’s influence on body shape and appearance. Research has demonstrated that concerns related to body size and body images significantly influence the well-being of children and adolescents. Much of this research adopts an individualistic and/or psychological perspective. Less attention has been paid to relational aspects, particularly the ways in which children and adolescents as embodied, social agents, are actively engaged in relationally shaping and doing body-related practices in various social contexts. This study aims to address this gap by employing an microsociological interactionist approach to explore the social dynamics surrounding children and adolescent’s embodiment, seeking to answer the following question: How do children and adolescents shape and practice their different bodies in peer relations? Methodologically, this research is based on a sociological field study, immersed in the everyday lives of children and adolescents as they unfold in school. Drawing on body sociology, the study observes their embodied practices in social interactions, over a six-month period (Winter/Spring 2025). The research follows three classes from the 1st, 4th, and 7th grades (age range 6-14), respectively, in a public school in Northern Denmark, supplemented by focus group interviews with the children and adolescents, as well as with affiliated teachers and pedagogues. The field study, as an embodied activity, and the physicality of the methodology, provide valuable insights into how children and adolescents practice and make sense of their different bodies. This type of field study also aligns with the interactionist focus on social reality as it unfolds in situ. Within this interactionist inspired framework, social interactions are considered the fundamental unit through which meaning-making and social relations are co-created among social actors. From this perspective, everyday life serves as a central social context, and being embedded in the children and adolescents’ daily school life allows for an in-depth exploration of their often mundane and taken-for-granted practices in peer relations - in other words, the social knowledge that constitutes everyday life. Utilizing sensitizing concepts such as Julia Coffey’s framework on ‘Everyday Embodiment,’ this research describes the diverse ways in which children and adolescents practice and shape their different bodies in everyday social interactions, conceptualising the body as processual and social instead of static. This study’s unique contribution lies in its explorative nature and in foregrounding the relational shaping of children and adolescents’ embodied practices and interactions. Providing insights into how children and adolescents practice their different bodies and interact with current body images, these findings can contribute to the development of future strategies and interventions aimed at enhancing the well-being of young people.

Keywords: adolescence, body image, body sociology, childhood, embodiment, everyday practices, field study, interactionism, peer relations, well-being

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Authors: Na Li, Samuel Simon Araya, Søren Knudsen Kær

Abstract:

This study investigates the effects of operating parameters of different current density, temperature and pressure on the performance of a proton exchange membrane (PEM) water electrolysis stack. A 7-cell PEM water electrolysis stack was assembled and tested under different operation modules. The voltage change and polarization curves under different test conditions, namely current density, temperature and pressure, were recorded. Results show that higher temperature has positive effect on overall stack performance, where temperature of 80 ℃ improved the cell performance greatly. However, the cathode pressure and current density has little effect on stack performance.

Keywords: PEM electrolysis stack, current density, temperature, pressure

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Authors: Megha Rao, Søren H. Jensen, Xiufu Sun, Anke Hagen, Mogens B. Mogensen

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Solid oxide electrolysis cells have an immense potential in converting CO₂ and H₂O into syngas during co-electrolysis operation. The produced syngas can be further converted into hydrocarbons. This kind of technology is called power-to-gas or power-to-liquid. To produce hydrocarbons via this route, durability of the cells is still a challenge, which needs to be further investigated in order to improve the cells. In this work, various nickel-yttria stabilized zirconia (Ni-YSZ) fuel electrode supported or YSZ electrolyte supported cells, cerium gadolinium oxide (CGO) barrier layer, and an oxygen electrode are investigated for durability under co-electrolysis conditions in both galvanostatic and potentiostatic conditions. While changing the gas on the oxygen electrode, keeping the fuel electrode gas composition constant, a change in the gas concentration arc was observed by impedance spectroscopy. Measurements of open circuit potential revealed the presence of leaks in the setup. It is speculated that the change in concentration impedance may be related to the leaks. Furthermore, the cells were also tested under pressurized conditions to find an inter-play between the leak rate and the pressure. A mathematical modeling together with electrochemical and microscopy analysis is presented.

Keywords: co-electrolysis, durability, leaks, gas concentration arc

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Authors: René A. Sørensen, Søren Skovsen, Peter Christiansen, Henrik Karstoft

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Autonomous agricultural machines act in stochastic surroundings and therefore, must be able to perceive the surroundings in real time. This perception can be achieved using image sensors combined with advanced machine learning, in particular Deep Learning. Deep convolutional neural networks excel in labeling and perceiving color images and since the cost of high-quality RGB-cameras is low, the hardware cost of good perception depends heavily on memory and computation power. This paper investigates the possibility of designing lightweight convolutional neural networks for semantic segmentation (pixel wise classification) with reduced hardware requirements, to allow for embedded usage in autonomous agricultural machines. Using compression techniques, a lightweight convolutional neural network is designed to perform real-time semantic segmentation on an embedded platform. The network is trained on two large datasets, ImageNet and Pascal Context, to recognize up to 400 individual classes. The 400 classes are remapped into agricultural superclasses (e.g. human, animal, sky, road, field, shelterbelt and obstacle) and the ability to provide accurate real-time perception of agricultural surroundings is studied. The network is applied to the case of autonomous grass mowing using the NVIDIA Tegra X1 embedded platform. Feeding case-specific images to the network results in a fully segmented map of the superclasses in the image. As the network is still being designed and optimized, only a qualitative analysis of the method is complete at the abstract submission deadline. Proceeding this deadline, the finalized design is quantitatively evaluated on 20 annotated grass mowing images. Lightweight convolutional neural networks for semantic segmentation can be implemented on an embedded platform and show competitive performance with regards to accuracy and speed. It is feasible to provide cost-efficient perceptive capabilities related to semantic segmentation for autonomous agricultural machines.

Keywords: autonomous agricultural machines, deep learning, safety, visual perception

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Authors: Søren Birkvad

Abstract:

This paper traces the development of sexual cinematic freedom in the wake of an epoch-making event in Danish cultural history. As the first in the world, the Danes abolished all censorship for adults in 1969, making the tiny nation of Denmark the world’s largest exporter of pornography for several years. Drawing on the insights of social and cultural history and the focus point of the National Cinema direction of Cinema Studies, this study focuses on Danish film pornography in the 1960s and 1970s in its own right (e.g., its peculiar mix of sex, popular comedy and certain ‘feminist’ agendas). More importantly, however, it covers a broader pattern, namely the culturally deep-rooted tradition of freedom of speech and sexual liberalism in Denmark. Thus, the key concept of frisind (“free mind”) in Danish cultural history took on an increasingly partisan application in the 1960s and 1970s. It became a designation for all-is-permitted hippie excess but was also embraced by dissenting movements on the left, such as feminism, which questioned whether a free mind necessarily meant free love. In all of this, Danish cinema from the 1960s and 1970s offers a remarkable source of historical insight, simultaneously reminding us of a number of acute issues of contemporary society. These issues include gendered ideas of sexuality and freedom then and now and the equivalent clash of cultures between a liberal commercial industry and the accelerating political demands of the “sexual revolution.” Finally, these issues include certain tensions between, on the one hand, a purely materialistic idea of sexual freedom – incarnated by anything from pornography to many of the taboo-breaking youth films and avant-garde films in the wake of the 1968-rebellion – and, on the other hand, growing opposition to this anti-spiritual perception of human sexuality (represented by for instance the ‘closet conservatism’ of Danish art film star Lars von Trier of nowadays). All in all, this presentation offers a reflection on ideas of sexuality and gender rooted in a unique historical moment in cinematic history.

Keywords: Danish film history, cultural history, film pornography, history of sexuality, national cinema, sexual liberalism

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