Sökning: "Miljöförhållanden"

Visar resultat 6 - 10 av 17 avhandlingar innehållade ordet Miljöförhållanden.

1. 6. Reactive dissolved organic carbon dynamics in a changing environment : Experimental evidence from soil and water

   Författare :Balathandayuthabani Panneer Selvam; Institutionen för naturgeografi och ekosystemvetenskap; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dissolved organic carbon; DOC; Photodegradation; Biodegradation; DOC reactivity;

   Sammanfattning : Dissolved organic carbon (DOC) is the major form of organic carbon in aquatic ecosystems. Biological and photochemical degradation of DOC are major causes of greenhouse gas emissions from aquatic ecosystems. LÄS MER

3. 7. Dynamics and Intrinsic Variability of Spintronic Devices

   Författare :Corrado Carlo Maria Capriata; B. Gunnar Malm; Per-Erik Hellström; Dan Kuylenstierna; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Spintronics; micromagnetic simulations; SHNO; MTJ; microwave measurements; realistic simulations; low-temperature measurements; fabrication; grains; Spinntronik; mikromagnetiska simuleringar; SHNO; MTJ; mikrovågsmätningar; realistiska simuleringar; lågtemperaturmätningar; nanotillverkning; korn; Informations- och kommunikationsteknik; Information and Communication Technology;

   Sammanfattning : Spintronics is a scientific domain focusing on utilizing electron spin for information processing. This is the element that distinguishes it from electronics, which only utilizes the charge of electrons. LÄS MER

4. 8. Modelling of intergranular stress corrosion cracking mechanism : Du som saknar dator/datorvana kan kontakta [email protected] för information

   Författare :Michal Sedlak Mosesson; Bo Alfredsson; Thierry Couvant; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cohesive Zone Model; Fracture Mechanics; Diffusion; Duplex oxide; Multi-physics; Finite Element Model; Engineering Mechanics; Teknisk mekanik;

   Sammanfattning : When assessing nuclear power plant life, stress corrosion cracking (SCC) plays an important role. Stress corrosion cracking in nuclear power plants is well recognized and heavily researched. Still due to its complicated nature it is not completely understood. There are many different damage mechanisms behind SCC. LÄS MER

5. 9. Morphometric and Landscape Feature Analysis with Artificial Neural Networks and SRTM data : Applications in Humid and Arid Environments

   Författare :Amir Houshang Ehsani; Friedrich Quiel; Wolfgang Wagner; KTH; []
   Nyckelord :Self Organizing Map; Neural Network; Morphometric Feature; Landscape; Yardang; Lut Desert; Potential natural vegetation; geoecosystem; Landform; Landsat ETM ; Morphometric Parameters; SRTM; Resolution; Curvatures; DEM.; TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : This thesis presents a semi-automatic method to analyze morphometric features and landscape elements based on Self Organizing Map (SOM) as an unsupervised Artificial Neural Network algorithm in two completely different environments: 1) the Man and Biosphere Reserve “Eastern Carpathians” (Central Europe) as a complex mountainous humid area and 2) Lut Desert, Iran, a hyper arid region characterized by repetition of wind-eroded features. In 2003, the National Aeronautics and Space Administration (NASA) released the SRTM/ SIR-C band data with 3 arc seconds (approx. LÄS MER

7. 10. Phenotypic plasticity and local adaptation in tadpoles

   Författare :Björn Lardner; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; salinity tolerance; trade-off; life-history; tail depth; inducible defence; antipredator strategies; tadpoles; anurans; amphibians; Phenotypic plasticity; local adaptation; competitive ability; allozymes.; Animal ecology; Djurekologi;

   Sammanfattning : Amphibian larvae are plastic in many traits. Can plasticity buffer population divergence, so that local adaptation is more common in non-plastic traits? I argue that this may be the case for adaptive plastic responses. LÄS MER