Sökning: "ITG"

Visar resultat 16 - 20 av 24 avhandlingar innehållade ordet ITG.

1. 16. Predictive Simulations of Transport in Tokamak

   Författare :Pär Strand; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : The understanding of anomalous transport mechanisms in magnetically confined plasmas is one of the most central issues for the achievement of controlled thermonuclear fusion. Even though this problem has been given a very high priority since the very beginning of the magnetic fusion research programs, there are several outstanding issues that remain to be resolved. LÄS MER

3. 17. Simulation and assessment of particle transport in fusion plasmas

   Författare :Emil Fransson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Fusion -- Plasma physics -- Turbulent transport --Gyrofluid --Gyrokinetic;

   Sammanfattning : A civilized society need energy to function. An attractive new energy source is nuclear fusion with its abundance of fuel, intrinsic safety and limited environmental impact. Although the concept of fusion for energy has been well understood for over a century, to create it here on earth has been more irksome. LÄS MER

4. 18. Fast ions and turbulent particle transport in tokamaks

   Författare :Frida Eriksson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NBI; numerical modelling; turbulence; drift waves; bump-on-tail; density peaking; Fusion plasma physics; wave-particle interaction;

   Sammanfattning : The presence of highly energetic (fast) ions, be it fusion born alpha particles or ions accelerated by auxiliary heating schemes, can affect the heating and transport of all particles in the plasma through two main mechanisms. First, fast ions may excite fast ion driven instabilities. LÄS MER

5. 19. Transport Barriers in Plasmas and Fluids

   Författare :Robert Moestam; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DNS; transport barriers; Zonal flows; L-H mode transition; turbulence simulations; drift waves; flux tube simulations; nonlinear instabilities; linear instabilities;

   Sammanfattning : In the present work different mechanisms for generation and suppression of turbulence are studied. The suppression of nonlinearly generated turbulence stabilized by temperature boundary conditions as well as turbulence generated by linear instabilities and suppressed by nonlinearly generated secondary flows are treated. LÄS MER

7. 20. Information Technology Governance: The Role of Organizational Culture and Structure

   Författare :Parisa Aasi; Lazar Rusu; Erik Perjons; Björn Johansson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; IT governance; organizational culture; organizational structure; IT governance performance; IT governance implementation; Computer and Systems Sciences; data- och systemvetenskap;

   Sammanfattning : Information Technology Governance (ITG) is among the most important challenges for the managers today. IT is not anymore just a supportive tool but also a strategic driver for the businesses. In the dynamic and competitive world of today, it is crucial for organizations to know how to govern IT rather than just to use it. LÄS MER