Sökning: "knot"

Visar resultat 11 - 15 av 60 avhandlingar innehållade ordet knot.

1. 11. Arnold-type invariants of curves and wave fronts on surfaces

   Författare :Vladimir Tchernov; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Immersion of the circle; generic immersion; curves on surfaces; Legendrian immersion; Legendrian knot; wave fronts on surfaces; Whitney index; Maslov index; regular homotopy; perestroikas of plane curves and fronts; Arnold s basic invariants of plane curves and fronts; finite order invariants; Vassiliev invariants; homotopy groups of the space of curves on a surface; MATEMATIK; MATHEMATICS; MATEMATIK; matematik; Mathematics;

   Sammanfattning : This thesis is devoted to the study of invariants of generic curves and wave fronts on surfaces. The invariants J± and St were axiomatically defined by Arnold as numerical characteristics of generic curves (immersions of the circle)on ℝ2 he introduced J± in the case of generic planar wave fronts. LÄS MER

3. 12. Field Theories and Vortices with Nontrivial Geometry

   Författare :Kristel Torokoff; Antti Niemi; Masud Chaichian; Uppsala universitet; []
   Nyckelord :Theoretical physics; theoretical physics; gauge field theory; knot theory; spontaneously broken symmetry; effective model; numerical calculation; soliton; vortex; electromagnetic plasma; Teoretisk fysik;

   Sammanfattning : This thesis investigates aspects of field theories and soliton solutions with nontrivial topology. In particular we explore the following effective models: a limited sector of the scalar Electroweak theory called extended Abelian Higgs model, and a classical mechanics model derived from the low energy SU(2) Yang-Mills theory. LÄS MER

4. 13. Tying the knot between faculty development and educational change in clinical settings

   Författare :Agnes Elmberger; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Clinical workplaces offer important learning experiences for the next generation of health professionals, and clinicians serving as supervisors and educators are a critical determinant of the quality of learning in these settings. However, many clinicians are unprepared for their educational roles, and the complexity and changing nature of health care present substantial challenges that threaten the quality of clinical education. LÄS MER

5. 14. Root-knot nematodes and coffee in Nicaragua : management systems, species identification and genetic diversity

   Författare :Isabel Cristina Herrera Sirias; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

   Sammanfattning : The coffee production is affected by several limiting factors such as parasitic nematodes. Plant-parasitic nematodes have a substantial economic impact on coffee production in most countries and they are regarded as one of the major limiting factors in coffee production and worldwide coffee losses have been estimated to about 15%. LÄS MER

7. 15. Individual-tree-selection in uneven-sized Norway spruce stands in southern Sweden : Developments of tools for simulation and optimization

   Författare :Nils Fagerberg; Johan Bergh; Peter Lohmander; Stergios Adamopoulos; Hubert Hasenauer; Linnéuniversitetet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; continuous cover forestry; selective cutting; Picea abies; uneven-aged; single-tree-selection; growth model; knot size model; Forestry and Wood Technology; Skog och träteknik;

   Sammanfattning : Individual-tree-selection (ITS) is a continuous cover forestry method that aims to utilize the uneven-sized stand structure through optimized individual tree selections. ITS is an interesting management alternative to rotation forestry in terms of production of multiple benefits and forest owner profitability. LÄS MER