Sökning: "matematik material"

Visar resultat 31 - 35 av 171 avhandlingar innehållade orden matematik material.

  1. 31. Doctoral thesis: On the Role of Process Regions at Stationary and Growing Cracks

    Författare :P. Ståhle; Hållfasthetslära; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Studies of crack behaviour and fracture are generally performed using continuum analysis. Thus, the process region is either not considered at all or assumed to be point-sized. In the latter case it is often ascribed a desired property, usually the ability to consume energy. LÄS MER

  3. 32. Adaptive finite element/difference methods for time-dependent inverse scattering problems

    Författare :Larisa Beilina; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In this thesis we develop adaptive hybrid finite element/difference methods for inverse time-domain acoustic and elastic scattering, where we seek to find the location and form of a (small) unknown object inside a large homogeneous body from measured wave-reflection data. We formulate the inverse problem as an optimal control problem, where we seek to reconstruct unknown material coefficients with best least squares wave fit to data. LÄS MER

  4. 33. Subanalytic sets in the calculus of variation

    Författare :Martin Tamm; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The purpose of this thesis is to develop a theory for certain extreme value problems, depending analytically on some set of parameters. In particular it aims at a description of the singularities of the extreme value functions. In this context, a central role is played by the concept of subanalytic functions (i.e. LÄS MER

  5. 34. Fatigue limit, inclusion and finite lives - a statistical point of view

    Författare :Sara Lorén; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; censoring; likelihood; profile predictive likelihood; staircase test; extreme value; likelihood;

    Sammanfattning : An important design property of steel is the fatigue limit, i.e. the load level where a specimen has infinite life. For the material it can also be defined an endurance limit, which is the stress level at which the specimen has a certain life. LÄS MER

  7. 35. Integral Closure and Related Operations on Monomial Ideals

    Författare :Veronica Crispin Quiñonez; Ralf Fröberg; Christian Gottlieb; Marco D'Anna; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Integral closure; monomial ideal; minimal reduction; Ratliff-Rush; Algebra and geometry; Algebra och geometri;

    Sammanfattning : The motivation for this thesis starts with the theory of Hilbert coefficients. It is a well known fact that given an ideal I the integral closure Ī can be defined as the largest ideal with the same multiplicity as I. For monomial ideals there is an alternative definition. LÄS MER