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https://www.ht.lu.se/serie/3516816/ - 2026-06-25

The aim of this article is to study how selected variables influence delays in train traffic. Data has been collected on train movements, timetables, weather and capacity utilization on a highly utilized single-track railway line in southern Sweden during 2014. Based on this dataset, we have analysed how different factors affect delays in passenger traffic. We measure delays in a novel way, as dev

Until recently studies regarding the pathological aspects of refugee experiences have led the psychology field of forced migration, giving little space to positive factors like the resilience and well-being of individuals faced with these adversities. This doctoral thesis emphasizes good health rather than disease and aims at deepening the understanding of resilience and health as opposed to the d

The aim with this study was to investigate the senses of the lexemes /assassinated/, /killed/, and /murdered/ in 21st century American and British newspaper discourse, which was done with the method of corpus-driven Cognitive Linguistics. The main research questions dealt with how the combination of grammatical and contextual features of the articles frame patients and agents of the verbs. A focus

Portfolio optimization involves a tradeoff between maximizing expected returnand minimizing risk. In practice, useful formulations also include various costs and constraints that regularize the problem and reduce the risk due to estimation errors, resulting in solutions that depend on a number of hyperparameters. As the number of hyperparameters grows, selecting their value becomes increasingly imPortfolio selection involves a trade-off between maximizing expected return and minimizing risk. In practice, useful formulations also include various costs and constraints that regularize the problem and reduce the risk due to estimation errors, resulting in solutions that depend on a number of hyperparameters. As the number of hyperparameters grows, selecting their value becomes increasingly imp

Metalloenzymes catalyse a wide variety of reactions in nature. In the thesis, I have studied the reaction mechanism of three metalloenzymes, viz. [NiFe] hydrogenase (H2ase), dimethyl sulfoxide reductase (DMSOR) and formate dehydrogenase (FDH), by theoretical methods, namely quantum mechanics (QM), combined quantum mechanical and molecular mechanics (QM/MM), as well as QM/MM thermodynamic cycle per

We examine a special case of inquiry games inspired by Hintikka's interrogative model of inquiry, and give an account of the informational import of asking questions. We focus on yes-no questions, which always carry information about the questioner's strategy, but never about the state of Nature, and show how strategic information reduces uncertainty through inferences about other players' goals a