Sökning: "unknown transition matrix"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden unknown transition matrix.

  1. 1. On estimation in econometric systems in the presence of time-varying parameters

    Författare :Kurt Brännäs; Umeå universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; NATURVETENSKAP; SAMHÄLLSVETENSKAP; NATURAL SCIENCES; SOCIAL SCIENCES; Econometric systems; time-varying parameters; Kalman filtering; stochastic regressors; unknown transition matrix; robustness; simulation;

    Sammanfattning : Economic systems are often subject to structural variability. For the achievement of correct structural specification in econometric modelling it is then important to allow for parameters that are time-varying, and to apply estimation techniques suitably designed for inference in such models. LÄS MER

  2. 2. Scattering of elastic waves by an anisotropic sphere

    Författare :Ata Jafarzadeh; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Sphere; T matrix; Effective wave number; Distribution of inclusions; Phase velocity.; Anisotropy; Attenuation; Scattering;

    Sammanfattning : Scattering of a plane wave by a single spherical obstacle is the archetype of many scattering problems in physics and geophysics. Spherical objects can provide a good approximation for many real objects, and the analytic formulation for a single sphere can be used to investigate wave propagation in more complicated structures like particle composites or grainy materials, which may have application in non-destructive testing, material characterization, medical ultrasound, etc. LÄS MER

  3. 3. Platelets – Multifaceted players in tumor progression and vascular function

    Författare :Yanyu Zhang; Anna-Karin Olsson; Gertraud Orend; Uppsala universitet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Cancer; Tumor; Platelet; HRG; PDGFB; TBK1; NETs; Angiogenesis; EMT; Metastasis; Medicinsk vetenskap; Medical Science; Oncology; Onkologi; Biologi med inriktning mot molekylär cellbiologi; Biology with specialization in Molecular Cell Biology;

    Sammanfattning : Platelets play a crucial role for blood hemostasis, the process that prevents bleeding. In addition, platelets have been demonstrated to promote cancer progression and cancer related complications like metastasis and thrombosis. LÄS MER

  4. 4. Mechanistic Approach to Corrosion of Zirconium by Water - A First Principle Study

    Författare :Mikaela Lindgren; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; zirconium; hydrogen pick-up; corrosion; oxygen vacancy; DFT;

    Sammanfattning : Zirconium and zirconium oxides are of major technological importance. There are broad applications for these materials, from fuel cell electrolyte to semiconductors and in hip-implants. In nuclear power plants, zirconium alloys are widely used as cladding material to contain the fission fuel in the reactor cores. LÄS MER

  5. 5. Cell cycle control in G1 : restriction points for growth factors and anchorage dependence

    Författare :Peter Zickert; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; cell cycle; cyclin E; growth control; growth factor; restriction point; ECM; anchorage;

    Sammanfattning : Background: The eukaryotic cell cycle consists of four well-defined phases. During the S phase DNA is replicated and during the M phase the chromosomes are segregated to daughter cells. The time gap between completion of M phase and entry into S phase is called G1. The time gap between S phase and mitosis is called G2. LÄS MER