Sökning: "thermal history"

Visar resultat 16 - 20 av 79 avhandlingar innehållade orden thermal history.

1. 16. Parameters Controlling Distribution of Diagenetic Alterations within Fluvial and Shallow Marine Sandstone Reservoirs : Evidence from the Libyan Basins

   Författare :Muftah Khalifa; Hemin Koyi; Joao Marcelo Medina Ketzer; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Diagenesis; Structural setting; Depositional facies; Basin thermal history; Ther- mal Hot basinal brines; Fluid inclusions; Raman Spectrometry; Stylolites; Hydro-carbon migration; Geovetenskap med inriktning mot mineralogi; petrologi och tektonik; Earth Science with specialization in Mineral Chemistry; Petrology and Tectonics;

   Sammanfattning : This thesis demonstrates that geological setting, depositional facies, open system flux of hot basinal brines and descending of shallow waters have a strong impact on the distribution of the diagenetic alterations within continental and paralic/shallow marine sandstones which in turn control the quality and heterogeneities of the reservoirs.Geological setting controls the mineralogical and textural maturity of sandstone, whereas depositional facies control the pore water chemistry (marine, brackish or meteoric), sedimentary texture and sand body geometry. LÄS MER

3. 17. Shards of Iron Age Communications. A ceramological study of internal structures and external contacts in the Gudme-Lundeborg Area, Funen during the Late Roman Iron Age

   Författare :Ole Stilborg; Arkeologi; []
   Nyckelord :HUMANIORA; HUMANITIES; local; Funen; Gudme-Lundeborg Area; trading site; cemetery; settlement; Late Roman Iron Age; material systems; Things; communication; Pottery; ceramology; import; center; Archaeology; Arkeologi;

   Sammanfattning : The objective of ceramology is to describe pottery craft traditions; the potters, their production, social organisation and the use of the products. Through this the human actions surrounding the pottery are studied. LÄS MER

4. 18. Simulation of Thermal Stresses in a Brake Disc

   Författare :Asim Rashid; Niclas Strömberg; Tore Vernersson; Linköpings universitet; []
   Nyckelord :;

   Sammanfattning : In this thesis thermal stresses in a brake disc during a braking operation are simulated. The simulations are performed by using a sequential approach where the temperature history generated during a frictional heat analysis is used as an input for the stress analysis. LÄS MER

5. 19. Closed-Loop Combustion Control of a Multi Cylinder HCCI Engine using Variable Compression Ratio and Fast Thermal Management

   Författare :Göran Haraldsson; Förbränningsmotorer; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CR; Motorer; framdrivningssystem; Motors and propulsion systems; Teknik; Technological sciences; Closed-Loop Combustion Control; CLCC; Multi cylinder; HCCI; Black box; System identification; State feedback; PID; LQG; Fast Thermal Management; FTM; VCR Variable Compression Ratio;

   Sammanfattning : The current Spark Ignited (SI) engine equipped with three-way catalyst offers low emissions, but has low efficiency at part load, which results in unnecessarily high CO2 emissions. The Compression Ignited (CI) engines have higher efficiency and hence lower CO2 emissions, but suffer from higher Nitrogen Oxide (NOx) and Particulate Matter (PM) emissions, and no three-way catalyst can be used. LÄS MER

7. 20. Coupled thermal, metallurgical and mechanical models of multipass welding

   Författare :Lars Börjesson; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Datorstödd maskinkonstruktion; Computer Aided Design;

   Sammanfattning : This thesis deals with modelling and simulation of thermo mechanical processes in multipass welding. The aim of the simulations is to predict the residual stresses and/or the deformations that occur after welding. These residual stresses and deformations are caused by the high temperature gradients due to the local heating. LÄS MER