Search for dissertations about: "Christian Engström"

Showing result 1 - 5 of 6 swedish dissertations containing the words Christian Engström.

  2. 1. Effective properties of heterogeneous materials with applications in electromagnetics

    Author : Christian Engström; Institutionen för elektro- och informationsteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; homogenization; optics; acoustics; Electromagnetism; structural parameters; anisotropic material; inverse homogenization; Bloch waves; Maxwell s equations; Elektromagnetism; optik; akustik; Inverse bounds;

    Abstract : Composite materials, i.e, mixtures of two or more materials, are commonly used in industry, because they often have outstanding properties in comparison with the original materials. In many cases the inhomogeneities are on a very fine scale, which makes it difficult to perform a full numerical simulation of the material. READ MORE

  4. 2. Dental Health Care Cooperating with Primary Health Care as a Resource in Early Case Finding of Patients with Diabetes or Hypertension

    Author : Sevek Engström; Kurt Svärdsudd; Christian Berne; Lars Gahnberg; Margareta Kristenson; Uppsala universitet; []
    Keywords : Screening; dental care; primary health care; high blood pressure; high blood glucose; Family Medicine; Allmänmedicin;

    Abstract : Objectives To investigate if there is an association between dental health status and high blood pressure, to test the effectiveness of screening for high blood pressure and high blood glucose performed by the dental health care in collaboration with primary health care and to investigate the direct costs for this type of screening organisation. Study population and methods In Paper I 54 subjects with known hypertension and 141 with a high blood pressure in the dental office were compared with matched controls. READ MORE

  5. 3. Exponential integrators for stochastic partial differential equations

    Author : Rikard Anton; David Cohen; Christian Engström; Stig Larsson; Annika Lang; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Stochastic partial differential equations; numerical methods; stochastic exponential integrator; strong convergence; trace formulas;

    Abstract : Stochastic partial differential equations (SPDEs) have during the past decades become an important tool for modeling systems which are influenced by randomness. Because of the complex nature of SPDEs, knowledge of efficient numerical methods with good convergence and geometric properties is of considerable importance. READ MORE

  6. 4. Reliable hp finite element computations of scattering resonances in nano optics

    Author : Juan Carlos Araujo-Cabarcas; Christian Engström; David Cohen; Mats G. Larson; Jeffrey Ovall; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Scattering resonances; Helmholtz problems; pseudospectrum; Lippmann-Schwinger equation; finite element methods; nonlinear eigenvalue problems; spurious solutions;

    Abstract : Eigenfrequencies are commonly studied in wave propagation problems, as they are important in the analysis of closed cavities such as a microwave oven. For open systems, energy leaks into infinity and therefore scattering resonances are used instead of eigenfrequencies. READ MORE

  7. 5. POPULATION DYNAMICS AND TREE GROWTH STRUCTURE IN MATHEMATICAL ECOLOGY

    Author : Tin Nwe Aye; Linus Carlsson; Sergei Silvestrov; Masood Ayapoor; Christian Engström; Mälardalens högskola; []
    Keywords : Mathematics Applied Mathematics; matematik tillämpad matematik;

    Abstract : This thesis is based on four papers related to mathematical biology, where three papers focus on population dynamics and one paper concerns tree growth and stem structure. The first two papers are mainly devoted to studying the dynamics of physiologically structured population models by using Escalator Boxcar Train (EBT) method. READ MORE