Sökning: "stationary"

Visar resultat 1 - 5 av 705 avhandlingar innehållade ordet stationary.

1. 1. Multipole Moments of Stationary Spacetimes

   Författare :Thomas Bäckdahl; Magnus Herberthson; Brien Nolan; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; multipole moments; stationary; static; relativistic; spacetime; convergence; specified; Mathematical physics; Matematisk fysik;

   Sammanfattning : In this thesis we study the relativistic multipole moments for stationary asymptotically flat spacetimes as introduced by Geroch and Hansen. These multipole moments give an asymptotic description of the gravitational field in a coordinate independent way. LÄS MER

3. 2. Design and evaluation of stationary polymer electrolyte fuel cell systems

   Författare :Cecilia Wallmark; KTH; []
   Nyckelord :Small-scale; stationary; fuel cell system; polymer electrolyte fuel cell; PEFC system; reformer; thermodynamic modelling; pinch technology; exergy analyses; system configuration; test facility; experiments; application; simulation; installation; ener;

   Sammanfattning : The objectives of this doctoral thesis are to give a basisincluding methods for the development of stationary polymerelectrolyte fuel cell (PEFC) systems for combined heat andpower production. Moreover, the objectives include identifyingprerequisites, requirements and possibilities for PEFC systemsproducing heat and power for buildings in Sweden. LÄS MER

4. 3. Noise diagnostics of Stationary and Non-Stationary Reactor Processes

   Författare :Carl Sunde; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; core-barrel vibrations; break-frequency method; wavelet; decay ratio; detector tube impacting; two-phase flow; spectral analysis; noise diagnostics;

   Sammanfattning : This thesis concerns the application of noise diagnostics on different problems in the area of reactor physics involving both stationary and non-stationary core processes. Five different problems are treated, divided into three different parts. LÄS MER

5. 4. Economic Aspects of Fuel Cell-Based Stationary Energy Systems

   Författare :Suat Sevencan; Göran Lindbergh; Lechtenböhmer Stefan; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fuel cells; niche market; stationary applications; feasibility; multi-generation; Chemical Engineering; Kemiteknik;

   Sammanfattning : It is evident that human activity has an important impact on climate. Constantly increasing energy demand is one of the biggest causes of climate change. The fifth assessment report of the Inter-governmental panel on climate change states that decarbonisation of electricity generation is a key component of climate change mitigation. LÄS MER

7. 5. Multipole moments of axisymmetric spacetimes

   Författare :Thomas Bäckdahl; Magnus Herberthson; Brian Edgar; Kjell Rosquist; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; multipole moments; axisymmetry; spacetimes; prescribed; solutions; static; stationary; Kerr; Weyl; Ernst; Theory of relativity; gravitation; Relativitetsteori; gravitation;

   Sammanfattning : In this thesis we study multipole moments of axisymmetric spacetimes. Using the recursive definition of the multipole moments of Geroch and Hansen we develop a method for computing all multipole moments of a stationary axisymmetric spacetime without the use of a recursion. LÄS MER