Sökning: "Lars- Erik Persson"

Visar resultat 16 - 20 av 26 avhandlingar innehållade orden Lars- Erik Persson.

1. 16. Summability of Fourier transforms of functions from Lorentz spaces

   Författare :Aigerim Kopezhanova; Lars-Erik Persson; Peter Wall; Erlan Nursultanov; Mikhael Goldman; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Matematik;

   Sammanfattning : This PhD thesis is devoted to the study of relations between integrability properties of functions and summability properties of its Fourier coefficients and transforms. The relations are given in terms of generalized weighted Lorentz norms, where the weights have some additional growth properties. LÄS MER

3. 17. Investigation of the most essential factors influencing ski glide

   Författare :Leonid Kuzmin; Mikael Jonsson; Mats Tinnsten; Lars-Erik Persson; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wax; Computer Aided Design;

   Sammanfattning : There are many different parameters of a ski running surface (material, roughness, hydrophobicity, etc.). All the parameters have an influence on ski glide, some more and some less. Furthermore, some parameters with only minor relevance are commonly declared as critical, while truly critical parameters, as far as we know, never been investigated. LÄS MER

4. 18. Optimal and Hereditarily Optimal Realizations of Metric Spaces

   Författare :Alice Lesser; Svante Janson; Lars-Erik Persson; Anders Johansson; Vincent Moulton; Pierre Flener; Charles Semple; Uppsala universitet; []
   Nyckelord :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;

   Sammanfattning : 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. LÄS MER

5. 19. Properties of snow with applications related to climate change and skiing

   Författare :Nina Lintzén; Sven Knutsson; Lars-Erik Persson; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Soil Mechanics; Geoteknik;

   Sammanfattning : Snow has been a subject of research since the mid-20th century. Research on mechanical properties of snow started as an off-shoot of soil mechanics, where methods, tools and instruments used often are the same. However, during the last decades the winter business industry has been growing requiring a number of new fields of research. LÄS MER

7. 20. New methods for movement technique development in cross-country skiing using mathematical models and simulation

   Författare :Marie Lund Ohlsson; Mårten Gulliksson; Lars-Erik Persson; Fredrik Ståhl; Peter Carlsson; Mittuniversitetet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied mathematics; Tillämpad matematik;

   Sammanfattning : This Licentiate Thesis is devoted to the presentation and discussion of some new contributions in applied mathematics directed towards scientific computing in sports engineering. It considers inverse problems of biomechanical simulations with rigid body musculoskeletal systems especially in cross-country skiing. LÄS MER