Search for dissertations about: "knot"

Showing result 1 - 5 of 59 swedish dissertations containing the word knot.

  2. 1. Invariants of knot diagrams and diagrammatic knot invariants

    Author : Olof-Petter Östlund; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Knot theory; knot diagram; plane curve; Reidemeister move; finite degree invariant; combinatorial knot invariant; Gauss diagram; MATEMATIK; MATHEMATICS; MATEMATIK; matematik; Mathematics;

    Abstract : 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. READ MORE

  4. 2. Pith location and annual ring detection for modelling of knots and fibre orientation in structural timber : A Deep-Learning-Based Approach

    Author : Tadios Habite; Anders Olsson; Osama Abdeljaber; Jan Oscarsson; Welf Löwe; Julie Cool; Linnéuniversitetet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Sawn timber; Pith location; Deep learning; Artificial neural networks; Convolutional neural network; Conditional generative adversarial network; Knot detection; Knot modelling; Knot reconstruction; Fibre orientation; Annual ring profile; Byggteknik; Civil engineering;

    Abstract : Detection of pith, annual rings and knots in relation to timber board cross-sections is relevant for many purposes, such as for modelling of sawn timber and for real-time assessment of strength, stiffness and shape stability of wood materials. However, the methods that are available and implemented in optical scanners today do not always meet customer accuracy and/or speed requirements. READ MORE

  5. 3. Modeling the effects of knots in Structural Timber

    Author : Christina Foley; Avdelningen för Konstruktionsteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material technology; Byggnadsteknik; Building construction; three-dimensional fiber paradigm; fiber deviation; knots; annual growth layer; material matrix; knot bump; structural timber; load carrying capacity; Materiallära; critical knot; knot distance ratio; local principal material directions; stiffness; materialteknik;

    Abstract : The main purpose of the pursued research is to increase knowledge of the effects of knots in structural timber so that characteristics of weaker timber may be determined and applied to improve current grading techniques. In the process, a three-dimensional fiber paradigm was established, which describes variations of local principle material axes in timber containing knots. READ MORE

  6. 4. Computed tomography of sawlogs : knot detection and sawing optimization

    Author : Erik Johansson; Johan Carlson; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Träteknik; Wood Technology;

    Abstract : Branches on trees introduce defects on sawn timber called knots. By scanning sawlogs using computed tomography, knots can be detected and accounted for so that the sawing process can be optimized with respect to outgoing product value. READ MORE

  7. 5. KNOTCIRCUS : Or ‘Being the Adventures of Happy Down-River’

    Author : Jonathan Priest; Rolf Hughes; André Lepecki; Adrian Heathfield; Stockholms konstnärliga högskola; []
    Keywords : HUMANIORA; HUMANITIES; Circus; circus research; the circus trick; loop; paradox; contradiction; tautology; knot; knotcircus; fiction; Performativa och mediala praktiker; med inriktning mot film och media koreografi opera scen; Performative and mediated practices; with specializations in choreography film and media opera performing arts;

    Abstract : This is an investigation of the trick as it relates to three fields; gravity, language and capital.   I will fully break down and unpack what I mean by ‘trick’ later in this introduction, in the mean time I refer to it as something that refutes the systemic validity of the system through which it proceeds. READ MORE