Search for dissertations about: "cycles"

Showing result 1 - 5 of 1003 swedish dissertations containing the word cycles.

  2. 1. Celestial Cycles : Astronomical Concepts of Regeneration in the Ancient Egyptian Coffin Texts

    Author : Patrik Wallin; Katja Goebs; Uppsala universitet; []
    Keywords : HUMANIORA; HUMANITIES; NATURVETENSKAP; NATURAL SCIENCES; Archaeology; Ancient Egypt; Coffin Texts; Astronomy; Middle Kingdom; calendars; time; Arkeologi; Archaeology subjects; Arkeologiämnen; Egyptology; Egyptologi; Informatics; computer and systems science;

    Abstract : This study analyzes the astronomical references found in the ancient Egyptian Coffin Texts. Chapter i presents the aim and method of this study as well as describing the primary sources and previous research. Chapter 2 deals with the conceptual background for the three cycles, as related to the year, month and the day as units of time. READ MORE

  4. 2. Advanced Gas Turbine Cycles with Water-Air Mixtures as Working Fluid

    Author : Niklas Ågren; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gas turbine cycles; HAT cycles; evaporative cycles; power generation;

    Abstract : Since the early 80's, the worldwide utilization of gas turbines for thermal power generation has increased rapidly. They have less pollution than any other major combustion energy converters. READ MORE

  5. 3. Evaluation of test cycles for freight locomotives

    Author : Mattias Skoglund; Stefan Östlund; Peter Thelin; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; duty cycles; test cycles; diesel locomotives; locomotive emissions; dual modes; hybrid systems;

    Abstract : Diesel locomotives provide versatility to the railway system as they do not depend on electric feeding. Worldwide they constitute important parts of locomotive fleets used for various tasks such as mainline services, shunting and terminal operations. The main drawbacks are emissions of CO2, NOx and other pollutants. READ MORE

  6. 4. Closing nutrient cycles

    Author : Usman Akram; Uno Wennergren; Karin Tonderski; Genevieve Metson; Bob Rees; Linköpings universitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Adequate and balanced crop nutrition – with nitrogen (N), phosphorus (P), and potassium (K) – is vital for sustainable crop production. Inadequate and imbalanced crop nutrition contributes to the crop yield gaps – a difference in actual and potential crop yield. READ MORE

  7. 5. Families of cycles and the Chow scheme

    Author : David Rydh; Dan Laksov; Martin Olsson; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Families of cycles; Chow scheme; Hilbert scheme; zero-cycles; divided powers; symmetric tensors; symmetric product; Weil restriction; norm functor; Algebra and geometry; Algebra och geometri;

    Abstract : The objects studied in this thesis are families of cycles on schemes. A space — the Chow variety — parameterizing effective equidimensional cycles was constructed by Chow and van der Waerden in the first half of the twentieth century. Even though cycles are simple objects, the Chow variety is a rather intractable object. READ MORE