Sökning: "Thermal Effects"

Visar resultat 1 - 5 av 570 avhandlingar innehållade orden Thermal Effects.

  1. 1. Characterization and Compensation of Thermal Effects in GaN HEMT Technologies

    Detta är en avhandling från Gothenburg : Chalmers tekniska högskola

    Författare :Johan Bremer; [2020]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electrothermal; temperature compensation.; AlGaN GaN; thermal coupling; characterization; thermal effects; thermal resistance;

    Sammanfattning : Further advancements with GaN based technologies relies on the ability to handle the heat flux, which consequently arises from the high power density. Advanced cooling techniques and thermal optimization of the technology are therefore prioritized research areas. LÄS MER

  2. 2. Possibilities of using thermal mass in buildings to save energy, cut power consumption peaks and increase the thermal comfort

    Detta är en avhandling från Division of Building Materials, LTH, Lund University

    Författare :Jonathan Karlsson; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; concrete; aggregates; heat capacity; thermal properties; thermal conductivity; thermal inertia; thermal mass; time constant; Energy storage;

    Sammanfattning : The aim of this project was to generate knowledge to enable us to take advantage of heat storage in heavy building structures with regard to as energy savings, better thermal indoor climate, and reduced peak powers. This could include buildings that can function without energy input during cold periods, buildings that give a robust indoor climate without installed cooling, and buildings with good thermal comfort also in case of higher outdoor temperatures resulting from global warming. LÄS MER

  3. 3. Footwear for cold environments. Thermal properties, performance and testing

    Detta är en avhandling från Luleå University of Technology

    Författare :Kalev Kuklane; [1999]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; thermal insulation; sweating; skin temperature; thermal foot model; thermal responses; pain sensation; boots; footwear; cold; foot;

    Sammanfattning : Present standard on safety footwear (EN 344) checks the insulation only at one point in the shoes by means of measuring the temperature change. A method that uses thermal foot model allows to measure footwear insulation simultaneously at various locations and for whole footwear as well. LÄS MER

  4. 4. Comfort Climate Evaluation with Thermal Manikin Methods and Computer Simulation Models

    Detta är en avhandling från Stockholm : Byggvetenskap

    Författare :Håkan O Nilsson; [2004]
    Nyckelord :thermal climate assessment; thermal environment; office environment; cabin; climate; CFD; thermal manikin; comfort zone diagram;

    Sammanfattning : Increasing concern about energy consumption and thesimultaneous need for an acceptable thermal environment makesit necessary to estimate in advance what effect differentthermal factors will have on the occupants. Temperaturemeasurements alone do not account for all climate effects onthe human body and especially not for local effects ofconvection and radiation. LÄS MER

  5. 5. Analysis of thermal shock in brittle materials

    Detta är en avhandling från Stockholm : Materialvetenskap

    Författare :Marianne Collin; [2001]
    Nyckelord :thermal shock; thermal stress; stress intensity; vickers indentation; alumina; silicon varbide whisker reinforced alumina;

    Sammanfattning : This thesis concerns thermal shock damage of ceramicmaterials. More specifically the work is focused on theoreticaland practical aspects of a new technique for determining thethermal shock resistance of brittle materials. LÄS MER