Search for dissertations about: "conductivity"

Showing result 11 - 15 of 892 swedish dissertations containing the word conductivity.

2. 11. Hierarchical Structuring of Mg2Si1-xSnx Alloys for Lower Thermal Conductivity and Thermal Conductivity as Probe for Structural Characterization

   Author : Andrey Sizov; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; structural probing; Rietveld refinement; hot disc; spinodal decomposition; magnesium silicide-stannide; Microstructuring; phase separation; X-ray diffraction; thermal conductivity; thermoelectrics;

   Abstract : The thermoelectric effect was discovered nearly 200 years ago, but it started to be utilized for waste heat recovery fairly recently. From the economical point of view, such application requires a cheap and efficient material, which is able to convert heat energy into electricity. READ MORE

4. 12. Fundamentals of Polyethylene Composites for HVDC Cable Insulation – Interfaces and Charge Carriers

   Author : Mattias E. Karlsson; Richard Olsson; Mikael Skrifvars; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; polyethylene; nanocomposites; HVDC; conductivity; metal oxide; nanoparticles; surface functionality; polyeten; nanokompositer; HVDC; konduktivitet; metalloxider; nanopartiklar; ytfunktionalitet; Fiber- och polymervetenskap; Fibre and Polymer Science;

   Abstract : Power transmission over long distances by using high voltage direct current (HVDC) cables is important for the transition from fossil energy to using renewable energy sources, e.g. wind, solar and water. READ MORE

5. 13. In-line application of electric fields in capillary separation systems

   Author : Björn Eriksson; Lars Blomberg; Magnus Andersson; Miroslav Macka; Karlstads universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; capillary separation; conductivity; in-line; electric field assisted liquid chromatography; Analytical chemistry; Analytisk kemi; Kemi; Chemistry;

   Abstract : The magnitude of an electric field possible to apply in a capillary separation system is limited, because a high electric field causes a too high current through the capillary. Application of the electric field in-line will give an increased conductivity in the column, further increasing the risk of too high currents. READ MORE

6. 14. Ionic transport of α-alumina below 1000°C : an in-situ impedance spectrosocpy study

   Author : Johan Öijerholm; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; α-alumina; in-situ impedance spectroscopy; molecular dynamics; spark plasma sintering; conductivity; microstructure; Materialvetenskap; Materials science; Teknisk materialvetenskap;

   Abstract : Ionic conductivity of metal oxides is critical for the function of a broad range of different components, such as electrolytes in solid oxide fuel cells and alloys designed for high temperature applications. In both cases the ionic conductivity can be studied by in situ impedance spectroscopy, which is also able to reveal information on the dielectric properties of the metal oxides, and in some cases the influence of their microstructure. READ MORE

7. 15. Characterization of Conduction and Polarization Properties of HVDC Cable XLPE Insulation Materials

   Author : Hossein Ghorbani; Hans Edin; Gilbert Teyssedre; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVDC insulation; power cable insulation; cross-linked polyethylene insulation; conductivity; dielectric losses; space charge; Electrical Engineering; Elektro- och systemteknik;

   Abstract : High voltage direct current (HVDC) cables with extruded insulation system were introduced in 1998. Since then this technology has been growing rapidly with many installations that are today operational at voltages up to 320 kV. READ MORE