Search for dissertations about: "tight span"

Found 4 swedish dissertations containing the words tight span.

  2. 1. Optimal and Hereditarily Optimal Realizations of Metric Spaces

    Author : Alice Lesser; Svante Janson; Lars-Erik Persson; Anders Johansson; Vincent Moulton; Pierre Flener; Charles Semple; Uppsala universitet; []
    Keywords : Applied mathematics; optimal realization; hereditarily optimal realization; tight span; phylogenetic network; Buneman graph; split decomposition; T-theory; finite metric space; topological graph theory; discrete geometry; Tillämpad matematik;

    Abstract : This PhD thesis, consisting of an introduction, four papers, and some supplementary results, studies the problem of finding an optimal realization of a given finite metric space: a weighted graph which preserves the metric's distances and has minimal total edge weight. This problem is known to be NP-hard, and solutions are not necessarily unique. READ MORE

  4. 2. World oil supply in the 21st century : A bottom-up perspective

    Author : Henrik Wachtmeister; Mikael Höök; Jamie Speirs; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; oil supply; oil production; oil prices; bottom-up; projections; conventional oil; tight oil; shale oil; Natural Resources and Sustainable Development; Naturresurser och hållbar utveckling;

    Abstract : Oil-fuelled progress was a defining feature of the 20th century, and still today, oil remains the world’s largest primary energy source. Yet, oil is a non-renewable and carbon-intensive resource, either depletion or resulting carbon emissions will ultimately limit its use. READ MORE

  5. 3. Regulation of insulin signaling and its developmental and functional roles on peptidergic neurons in the Drosophila central nervous system

    Author : Jiangnan Luo; Dick Nässel; Susan Broughton; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Insulin; serotonin; octopamine; insulin receptor; Dimm; neuropeptide; funktionell zoomorfologi; Functional Zoomorphology;

    Abstract : In Drosophila, eight insulin-like peptides (DILP1-8) are produced and secreted in different locations. They regulate many aspects of development and physiology, such as organism growth, metabolic homeostasis, reproduction, stress resistance and life span. READ MORE

  6. 4. Organic Bioelectronics for Neurotransmitter Release at the Speed of Life

    Author : Theresia Arbring Sjöström; Magnus Berggren; Daniel Simon; Klas Tybrandt; Marco Rolandi; Linköpings universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : The signaling dynamics in neuronal networks includes processes ranging from lifelong neuromodulation to direct synaptic neurotransmission. In chemical synapses, the time delay it takes to pass a signal from one neuron to the next lasts for less than a millisecond. READ MORE