Sökning: "Fields"

Visar resultat 21 - 25 av 2824 avhandlingar innehållade ordet Fields.

  1. 21. Models and Methods for Random Fields in Spatial Statistics with Computational Efficiency from Markov Properties

    Författare :David Bolin; Matematisk statistik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; random fields; Gaussian Markov random fields; Matérn covariances; stochastic partial differential equations; Computational efficiency;

    Sammanfattning : The focus of this work is on the development of new random field models and methods suitable for the analysis of large environmental data sets. A large part is devoted to a number of extensions to the newly proposed Stochastic Partial Differential Equation (SPDE) approach for representing Gaussian fields using Gaussian Markov Random Fields (GMRFs). LÄS MER

  3. 22. Investigations of auroral electric fields and currents

    Författare :Tommy Johansson; Göran Marklund; Kristina Lynch; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; auroral physics; auroral electric fields; auroral potential structures; auroral particle acceleration; Space physics; Rymdfysik;

    Sammanfattning : The Cluster spacecraft have been used to investigate auroral electric fields and field-aligned currents (FACs) at geocentric distances between 4 and 7 Re. The electric fields have been measured by the EFW instrument, consisting of two pairs of spherical probes, and the FACs have been calculated from measurements of the magnetic field by the FGM fluxgate magnetometer. LÄS MER

  4. 23. Vegetation on lava fields in the Hekla area, Iceland

    Författare :Ágúst H. Bjarnason; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Växtgeografi - Island; Lava fields; Iceland; Hekla area; Tephra;

    Sammanfattning : .... LÄS MER

  5. 24. Features and Origin of Electromagnetic Fields Generated by Lightning Flashes

    Författare :Mohd Muzafar Ismail; Vernon Cooray; Farhad Rachidi; Uppsala universitet; []
    Nyckelord :negative cloud-to-ground lightning flashes; HF and VHF radiation; chaotic pulse trains; lightning initiation; zero-crossing time; electromagnetic fields; Engineering Science with specialization in Atmospheric Discharges; Teknisk fysik med inriktning mot atmosfäriska urladdningar;

    Sammanfattning : Negative cloud-to-ground (CG) lightning flashes transport negative charge from cloud to ground. Negative ground flashes typically involve various processes identified as preliminary breakdown, stepped leader, return stroke, dart leader, dart-stepped leader, subsequent return stroke, and cloud activity between strokes, such as regular pulse trains and chaotic pulse trains. LÄS MER

  7. 25. The Outsider in Our Midst : A Study of Language and Norms Concerning the “Outsider” in Persian Period Yehud

    Författare :Karin Tillberg; Göran Eidevall; Mikael Larsson; Katherine Southwood; Uppsala universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Persian period; Nehemiah; Deuteronomy; Pentateuch; Isaiah; Trito-Isaiah; Bourdieu; doxa; capital; agents; fields; Derrida; hospitality; eunuchs; exile.; Gamla testamentets exegetik; Old Testament Exegesis;

    Sammanfattning : The topic for the present study concerns how values and norms are conveyed through language. I explore two texts set in the Persian period—Isaiah 56:1–8 and Nehemiah 13:1–3, 23–31—and how these texts discuss those literary figures described as not belonging to the community. LÄS MER