Search for dissertations about: "surface conductivity"

Showing result 1 - 5 of 321 swedish dissertations containing the words surface conductivity.

  2. 1. Electrical Charges on Polymeric Insulator Surfaces and their Impact on Flashover Performance

    Author : Sarath Kumara; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; streamer criterion; polymeric insulation; flashover voltage; surface potential; bulk conductivity; surface conduction; humidity; bulk neutralization; charge decay; Surface charge; silicone rubber; corona charging; gas neutralization;

    Abstract : Utilization of remotely located sustainable energy resources such as solar, wind and hydro calls for further developments of long-distance electric power transmissions operating at ultra-high voltage (UHV) levels which may exceed 1000 kV ac and 800 kV dc utilized today. It is foreseen that insulation of such transmission systems is to be based on polymeric materials that can provide a number of technical benefits over traditionally used glass and porcelain based insulation. READ MORE

  4. 2. Studies of ionic diffusion in crystalline rock

    Author : Yvonne Ohlsson; KTH; []
    Keywords : matrix diffusion; surface diffusion; surface conductivity; nuclear waste; rock; mineral; electrical conductivity;

    Abstract : .... READ MORE

  5. 3. Surface Charge Dynamics on Polymeric Insulating Materials for High Voltage Applications

    Author : Shahid Alam; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVDC insulation.; gas neutralization; decay rate; Surface charging; electrical conductivity; surface potential; charge transport; ambient pressure;

    Abstract : To meet increasing demands in electric energy, it is essential to enhance production of electricity from renewable energy sources (solar, wind and hydro). Such generation sites, however, are usually separated from consumption sites by long distances. READ MORE

  6. 4. Surface Stabilization and Electrochemical Properties from a Theoretical Perspective

    Author : Daniel Petrini; Karin Larsson; Jan-Otto Carlsson; Martin Stutzmann; Uppsala universitet; []
    Keywords : Inorganic chemistry; DFT; Diamond; High surface conductivity; Surface reactivity; c-BN; Oorganisk kemi;

    Abstract : Diamond and cubic boron nitride surfaces have extreme properties that can be exploited in novel tribological, electrochemical and electronic applications. Normally insulating diamond surfaces can exhibit high surface conductivities due to hydrogen termination and the nature of the surrounding atmosphere. READ MORE

  7. 5. Exploring the Frontiers of Polymer Electrolytes for Battery Applications : From Surface to Bulk

    Author : Christofer Sångeland; Daniel Brandell; Stefano Passerini; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lithium-ion batteries; solid-state polymer electrolytes; electrochemical stability window; interfaces; ionic conductivity; polycarbonate; polyester; sustainability; sodium-ion;

    Abstract : Lithium-ion batteries have dominated the market since their inception in 1991 due to their unparalleled energy and power densities, but are now faced with new challenges. Growing demand for battery materials for energy intense applications and large-scale interim energy storage have emphasized the need for safe and sustainable battery electrolytes. READ MORE