Sökning: "knots"
Visar resultat 16 - 20 av 64 avhandlingar innehållade ordet knots.
16. Invariants of knot diagrams and diagrammatic knot invariants
Sammanfattning : Two knot diagrams describe isotopic knots if and only if they can be connected by a sequence of planar isotopies and Reidemeister moves (cusp-, self-tangency-, and triple point moves). In this dissertation classes of knot diagrams, Reidemeister moves, and relations between sequences of Reidemeister moves are investigated, in a manner inspired by V. LÄS MER
17. Chekanov-Eliashberg dg-algebras and partially wrapped Floer cohomology
Sammanfattning : This thesis consists of an introduction and two research papers in the fields of symplectic and contact geometry. The focus of the thesis is on Floer theory and symplectic field theory. LÄS MER
18. Knotted Nodal Band Structures
Sammanfattning : It is well known that in conventional three dimensional (3D) Hermitian two band models, the intersections between the energy bands are generically given by points. The typical example are Weyl semimetals, where these singular points can be effectively described as Weyl fermions in the low energy regime. LÄS MER
19. Star clusters as engines of galaxy evolution
Sammanfattning : Stars form and live in hierarchical structures such as star clusters on the smallest scales up to groups of galaxies on the largest scales. The role of young and massive star clusters in the evolution of the host galaxies is one of the most active fields of research in modern astronomy. LÄS MER
20. Means to measure people's attitudes towards wood
Sammanfattning : Wood is a material with many faces. It evokes feelings in us that no artificial material can do. Wood has inherent aesthetic features which, rightly used, give the final product competitive advantage over other materials.In this thesis people's feelings and preferences for Scots pine (Pinus sylvestris) wood surfaces have been examined. LÄS MER
