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Visar resultat 1 - 5 av 6 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Gasoline Partially Premixed Combustion - An Advanced Internal Combustion Engine Concept Aimed to High Efficiency, Low Emissions and Low Acoustic Noise in the Whole Load Range

    Författare :Vittorio Manente; Förbränningsmotorer; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Environmental concerns such as global warming, the surge of crude oil prices and more stringent emission regulations are demanding the development of internal combustion engines that are highly efficient and low polluting. With classical internal combustion engine concepts such as diesel compression ignition and gasoline spark ignition engines, a trade-off exists between local and global emissions i. LÄS MER

  3. 2. Med kärret som källa : om begreppen offer och ritual inom arkeologin

    Författare :Åsa Berggren; Arkeologi; []
    Nyckelord :HUMANIORA; HUMANITIES; Stone Age; the past in the past; objectification; embodyment; ritualization; practice theory; sacrifice; archaeology; ritual; Malmö; Hindbygården; wetland depositions; Early Bronze Age;

    Sammanfattning : This thesis deals with questions concerning theoretical perspectives and archaeological interpretation. It is also a thesis about prehistoric wetland depositions, as they illustrate the discussion. The starting point of the study is the use of the concept of sacrifice (or offering) in Scandinavian archaeology. LÄS MER

  4. 3. The Pneumatic Hybrid Vehicle - A New Concept for Fuel Consumption Reduction

    Författare :Sasa Trajkovic; Förbränningsmotorer; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; VVA; Regenerative; Air-motor; Compressor; Pneumatic; Hybrid; Vehicle; Electric Hybrid; Drive Cycle; GT-Power; Simulink; FPGA;

    Sammanfattning : Urban traffic involves frequent acceleration and deceleration. During deceleration, the energy previously used to accelerate the vehicle is mainly wasted on heat generated by the friction brakes. If this energy that is wasted in traditional internal combustion engines (ICE) could be saved, the fuel economy would improve. LÄS MER

  5. 4. Socioeconomic patterns of overweight and obesity in Scania, Sweden

    Författare :Faisal Al-Emrani; Socialmedicin och global hälsa; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Overweight; obesity; socioeconomic inequality; social gradient; SES; BMI; social capital; birth cohort; ageing; retirement; Scania Public Health Cohort; Sweden;

    Sammanfattning : Overweight and obesity are major social and public health concerns globally. The obesity epidemic is caused by a widespread chronic energy imbalance between high-energy intake and low-energy expenditure, but this mechanism appears to be modified by a number of other biological, behavioral, and social factors that interact in a complicated manner. LÄS MER

  7. 5. Renewable Energy in Energy-Efficient, Low-Pollution Systems

    Författare :Bengt Johansson; Miljö- och energisystem; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydrogen; ethanol; methanol; rape methyl ester; biomass; renewable energy; cogeneration; energy efficiency; scenarios; air pollution; carbon dioxide; Environmental technology; pollution control; Miljöteknik; kontroll av utsläpp;

    Sammanfattning : Energy use accounts for the dominating fraction of total sulphur dioxide (SO2), nitrogen oxide (NOx), volatile organic compounds (VOCs) and carbon dioxide (CO2) emissions. In this thesis, different strategies for reducing these emissions are evaluated, using a bottom-up approach. The thesis is divided in two parts. LÄS MER