Sökning: "spatial heterogeneity"

Visar resultat 1 - 5 av 29 uppsatser innehållade orden spatial heterogeneity.

  1. 1. Spatial Heterogeneity of Weather impacts on Cycling Flows within Gothenburg, Sweden - A Geographic Framework for Local Pattern Analysis

    Master-uppsats, Göteborgs universitet/Institutionen för geovetenskaper

    Författare :Filip Olsson; [2019-10-25]
    Nyckelord :spatial heterogeneity; cycling; weather; local climate zones; explorative GIS;

    Sammanfattning : Background: In the past decade, the phenomenon of spatial heterogeneity has started to gaintraction in studies of cycling and weather. Cycling is usually the mode of transportation that ismost affected by inclement weather and the scientific consensus about how weather impactscycling behaviour on a general scale is for the most part well-established. LÄS MER

  2. 2. Adaptive Evolution of Resource Use, Phenotypic Diversity, and Productivity of Phytoplankton Communities

    Uppsats för yrkesexamina på avancerad nivå, Umeå universitet/Institutionen för fysik

    Författare :Nils Hellekant; [2019]
    Nyckelord :Adaptive Dynamics; phenotype; phytoplankton; plankton; BEF; Biodiversity; diversity; Spatial modeling; Ecosystem function; Evolution; Diversity;

    Sammanfattning : There is growing concern that the worldwide loss in biodiversity will harm the stability of the ecosystems, and thereby, the carrying capacity and critical ecosystem services the biosphere provides. Phytoplankton (microalgae) in lakes and oceans are arguably the most important primary producers. LÄS MER

  3. 3. Investigating Gas Turbulence in Galactic Discs

    Master-uppsats, Lunds universitet/Astronomi

    Författare :Timmy Ejdetjärn; [2019]
    Nyckelord :galaxies; gas; turbulence; interstellar medium; star formation; feedback; gravitational instability; local; high redshift; Physics and Astronomy;

    Sammanfattning : The interstellar medium of both local and distant disc galaxies is observed to be supersonically turbulent and the turbulent motion of the gas is thought to be important for galaxy formation and evolution, particularly as a key ingredient for star formation. Consequently, this generates a striking relation between the star formation rate (SFR) and gas velocity dispersion ($\sigma_{\rm g}$; a measurement on the level of turbulence). LÄS MER

  4. 4. Spatial Frequency-Based Objective Function for Optimization of Dose Heterogeneity in Grid Therapy

    Kandidat-uppsats, Stockholms universitet/Fysikum

    Författare :Fredén Emil; [2019]
    Nyckelord :Radiotherapy; Dose Optimization; Objective function; Dose Heterogeneity; Proton Grid Therapy; Spatially Fractionated Radiotherapy; SFRT;

    Sammanfattning : In this project we introduced a spatial frequency-based objective function for optimization of dose distributions used in spatially fractionated radiotherapy (also known as grid therapy). Several studies indicate that tissues can tolerate larger mean doses of radiation if the dose is delivered heterogeneously or to a partial volume of the organ. LÄS MER

  5. 5. Forest stand delineation through remote sensing and Object-Based Image Analysis

    Magister-uppsats, Högskolan i Gävle/Samhällsbyggnad, GIS

    Författare :José Antonio Ortega-García; [2018]
    Nyckelord :forest stand; stand delineation; LiDAR; ASTER; OBIA; GIS; remote sensing; segmentation; canopy heigh model; forestry; Navarra; OBIA; LiDAR; ASTER; segmentación; rodal; forestal; SIG; teledetección;

    Sammanfattning : Forest stand delineation is an essential task of forest management planning which can be time consuming and exposed to subjectivity. The increasing availability of LiDAR data and multispectral imagery offers an opportunity to improve stand delineation by means of remotely-sensed data. LÄS MER