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- Andreasson, Fredrik
(författare)
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Retande, berättelser och kategoriseringar : Om vänskap och kärlek i barns relationsprat
- 2023
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis focuses on how middle school children organize peer group relationships through various forms of so-called relational talk (Evaldsson, 2007), while they also negotiate and more generally make sense of friendships and romantic relationships. Prior micro-sociological research has demonstrated how children in everyday language practices through, for example, teasing, assessments, and storytelling—articulate and manage social relationships and behaviors, moral views, and shared cultural knowledge, thereby constructing their emerging social worlds (see Goodwin & Kyratzis, 2011, for an overview). Several ethnographic studies have also shown how children in everyday peer group interactions construct gendered cultures, encompassing gender hierarchies and heteronormative ordering, while managing social relationships (Renold, 2005). This study is a continued exploration into these areas, building on ethnographic fieldwork, including participant observations, video recordings, and focus group interviews with friendship groups among children in two fifth grade classes in a Swedish school setting. The analysis draws on an ethnomethodological multimodal interactional approach to talk-in- interaction (Goodwin, 1990), combined with membership categorization work (Stokoe, 2010) and ethnographic knowledge of the local culture (Evaldsson, 2021; Goodwin, 2014).The analysis shows that humor-oriented language practices, such as teasing and joking, function as a resource for children to address potentially sensitive and/or embarrassing aspects of social relationships, where humor and collective laughter work as a de-dramatizing resource while building local peer group relationships (cf. Eder, 1991). Moreover, the results show that children’s way of articulating and making sense of their views on friendship and romance through storytelling, assessments, and jocular play is related to a moral dimension, as they index and negotiate (un)acceptable behaviors. This dimension becomes visible through their invocation and management of membership categorizations, person descriptions, and evaluative comments in their local identity work. Simultaneously, the analysis demonstrates how ethnographic knowledge of children’s social life is central in understanding how wider social dynamics become part of the local peer cultures of preteen children (Evaldsson, 2005a; Goodwin, 2011), especially regarding how the negotiation of local categories and their embedded meanings is related to wider social categorizations of gender, social class, and age. Overall, this thesis demonstrates how children as social actors use a variety of interactional resources (i.e., talk, laughter, loud voices, facial expressions, smiles, and gestures) to organize local peer group relationships, while collectively staging, negotiating, and making sense of both romance and friendship.
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- Andersson, Robin, 1987-, et al.
(författare)
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Gävunda case study
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Annan publikation (övrigt vetenskapligt/konstnärligt)
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- Hang, Trieu
(författare)
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Performance of image-based velocimetry in river flow – Large Scale PIV and PTV
- 2023
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- River flow velocity is critical information for hydraulic and hydrological applications. Monitoring flow fields in near-plant waterways and river reach has wide engineering applications insustainable hydropower generation. For instance, exploring eco-hydraulic concerns such as fish migration, pollutant transport, and river erosion and understanding river floating debris are a few examples of practical applications. Due to complicated geometry and large volumes of natural flows, the measurement task using traditional methods (e.g., velocity propellers, acoustic Doppler velocimetry, with acoustic Doppler current profilers) usually requires extensive investigative work. The measurement procedure also requires contact with waterbody, thus avoiding its use in severe flood conditions. Image analysis approach allows the measurement task to capture the surface-water velocity distribution over a large outdoor area. The main objectives of this research are to (1) evaluate the feasibility of employing multiple cameras in a single measuring system to estimate the flow surfacevelocity and (2) improve the capability to use natural floating materials in river flow observations.The properties of the camera system and particle tracking velocimetry (PTV) algorithm were investigated in a laboratory open channel flow measurement before being deployed for field measurements. The in situ camera calibration methods, which correspond to the two measurement situations, were used to mitigate the instability of the camera mechanism and camera geometry. The artificial tracer particles were deployed to seed the flows. Two photogrammetry-based PTV algorithms are presented regarding different types of employed seeding particles. The first algorithm uses the particle tracking method applied for individual particles, whereas the second algorithm employs correlation-based particle clustering tracking for clusters of small-size particles. The outcomes reveal that the method can offer a reliable and accurate assessment of 3D surface velocity.In river surface velocity measurements, flow seeding is unavoidable in some situations where the water flow is clear, and there are no occurrences of floating materials on the surface. This part of the study focuses on the application of this technique for river velocity measurements using natural surfacefloating patterns. The use of a multiple-camera system provides the ability to perform 3D measurements on the river surface, including surface velocimetry and water surface reconstruction. The pattern-based tracking approach is used to adapt the performance of image measurements on different types of naturalfloating tracers. A comparison of pattern-based tracking with particle tracking reveals that these two approaches are consistent. An analysis of the characteristics of floating patterns is performed to understand their influences on standard deviation of measured velocity. Considerations on practicing image velocimetry in river flows are also discussed.
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