Sökning: "Geological material"

Visar resultat 1 - 5 av 94 avhandlingar innehållade orden Geological material.

  1. 1. Investigation of lithium and fluorine content in geological materials using Nuclear Reaction Analysis (NRA)

    Författare :Nathaly de La Rosa; Kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Nuclear reaction analysis NRA ; Geological material; Elemental composition analysis; Ion Beam Analysis IBA ;

    Sammanfattning : This work focuses on the optimization of the Nuclear Reaction Analysis (NRA) technique to determine the content of lithium and fluorine in geological materials. Measuring low concentration of these isotopes is of great relevance in many fields such as geological, astrophysical, biological and material sciences. LÄS MER

  3. 2. Conceptual Runoff Models for Material Transport Estimations

    Författare :Rikard Lidén; Avdelningen för Teknisk vattenresurslära; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; teknisk geologi; Hydrogeologi; geographical and geological engineering; Hydrogeology; Conceptual Rainfall-Runoff Modelling; Riverine Material Transport; teknisk geografi; Geophysics; physical oceanography; meteorology; Geofysik; fysisk oceanografi; meteorologi;

    Sammanfattning : Catchment-scale material transport models are today important tools for water and environmental management. However, modelling of material transport is extremely complex due to the physical, chemical and biological processes involved. LÄS MER

  4. 3. Atmospheric and geological entanglements : north american ecopoetry and the anthropocene

    Författare :Nuno Marques; Maria Lindgren Leavenworth; Daniel Andersson; Jonathan Skinner; Umeå universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Ecopoetry; ecopoetics; North American ecopoetry; form in poetry; lament; mourning; song; sound; atmosphere; air; geology; Anthropocene; entanglements; community-making; environmental justice; environmental humanities; ecocriticism; new materialisms.; Literature; litteraturvetenskap;

    Sammanfattning : Atmospheric and Geological Entanglements is a study of contemporary North American ecopoetry, a poetry which is characterized by a negotiation or subversion of established cultural representations of nature, and by a re-deployment of poetic forms such as lyrical poetry, pastoral and elegy. The studied poets experiment with form and question well-established categories such as human and nature, instead emphasizing connections between the human, other organisms, and inorganic matter. LÄS MER

  5. 4. ToF-SIMS as a tool for analysing organic material in geological samples -Fluid inclusions and beyond

    Författare :Sandra Siljeström; Jukka Lausmaa; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic material; ToF-SIMS; Other earth sciences; Övrig geovetenskap; geokemi; Geochemistry;

    Sammanfattning : In situ analysis of organic material in rocks has potential to answer questions in geochemistry, astro- and geobiology. Recently, successful studies which included in situ analyses of geological samples with time-of-flight secondary ion mass spectrometry (ToF-SIMS) were carried out. LÄS MER

  7. 5. Sensitivity Analysis and Material Parameter Estimation using Electromagnetic Modelling

    Författare :Therese Sjödén; Sven Nordebo; Börje Nilsson; Margaret Cheney; Linnéuniversitetet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sensitivity analysis; material parameter; Fisher information; Cramér-Rao bound; electromagnetic modelling; grain angle; wood; electrical impedance tomography; inverse problems; känslighetsanalys; estimering; materialparameter; Fisher- information; Cramér-Rao-gränsen; elektromagnetisk modellering; fibervinkel; trä; elektrisk impedanstomografi; inversa problem; Waves; Signals and Systems; Vågor; signaler och system;

    Sammanfattning : Estimating parameters is the problem of finding their values from measurements and modelling. Parameters describe properties of a system; material, for instance, are defined by mechanical, electrical, and chemical parameters. Fisher information is an information measure, giving information about how changes in the parameter effect the estimation. LÄS MER