Sökning: "driving pressure"

Visar resultat 21 - 25 av 142 avhandlingar innehållade orden driving pressure.

1. 21. Numerical Studies of Flow and AssociatedLosses in the Exhaust Port of a Diesel Engine

   Författare :Yue Wang; Laszlo Fuchs; Mihai Mihaescu; Angelo Onorati; KTH; []
   Nyckelord :Internal Combustion Engine; Exhaust flow; Exhaust Valve; Exhaust Port; Large Eddy Simulation; Valve and Piston Motion; Total Pressure Losses; Energy Losses; Discharge coefficient; Flow Losses; Flow structures; Air Flow Bench; Engine-like Conditions; SRA - Energy; SRA - Energi;

   Sammanfattning : In the last decades, the focus of internal combustion engine development has moved towards more efficient and less pollutant engines. In a Diesel engine, approximately 30-40% of the energy provided by combustion is lost through the exhaust gases. The exhaust gases are hot and therefore rich of energy. LÄS MER

3. 22. Plant-soil-herbivore interactions in a high Arctic wetland - Feedbacks to the carbon cycle

   Författare :Julie Maria Falk; Institutionen för naturgeografi och ekosystemvetenskap; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arctic wetlands; carbon balance; herbivory; increased grazing pressure; methane fluxes; muskox exclusion; substrate avalibility; vegetation composition and density;

   Sammanfattning : Arctic ecosystems hold massive amounts of the global carbon in their soils and are of great importance for the global terrestrial exchange of greenhouse gases to the atmosphere. The arctic region has in general been acting as a C sink for the past 10000 years, however with climate change the C balance in some areas is shifting towards becoming a C source. LÄS MER

4. 23. Automation of front-end loaders : electronic self leveling and payload estimation

   Författare :I Yung; Leonid Freidovich; Sven Rönnbäck; Carlos Vázquez; Tomas Nygren; Heikki Handroos; Umeå universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Front-End Loaders; Electronic Self Leveling; Modeling; Control; Disturbance estimation; Payload estimation; Equations of motion; Pressure-based friction;

   Sammanfattning : A growing population is driving automatization in agricultural industry to strive for more productive arable land. Being part of this process, this work is aimed to investigate the possibility to implement sensor-based automation in a particular system called Front End Loader, which is a lifting arms that is commonly mounted on the front of a tractor. LÄS MER

5. 24. TiAlN-based Coatings at High Pressures and Temperatures

   Författare :Robert Pilemalm; Magnus Odén; Mikael Olsson; Rachid M'Saoubi; Mats Jöesaar; Linköpings universitet; []
   Nyckelord :Materials science; thin films; coatings; spinodal decomposition; TiAlN; TiZrAlN; HPHT; high pressure high temperature; BELT-press; transmission electron microscopy; x-ray diifraction; microhardness;

   Sammanfattning : TiAlN and TiAlN-based coatings that are used of relevance as protection of cutting tool inserts used in metal machining have been studied. All coatings were deposited by reactive cathodic arc evaporation using industrial scale deposition systems. The metal content of the coatings was varied by using different combinations of compound cathodes. LÄS MER

7. 25. An integrative approach to neurocardiologic mechanisms of heart disease risk in professional drivers : application of neuro-psycophysiologic and work environment models

   Författare :Reza Emdad; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :professional drivers; ischemic heart disease; EEC; ERP; TypeA behavior; Stress; Job Strain; headlight glare; night driving;

   Sammanfattning : Aim: This dissertation aims to apply, develop and integrate neurophysiologic, psychophysiologic, and work environment models, along with behavioral and biomedical risk factors" to provide insight into the neurocardiologic mechanisms of heart disease risk in professional drivers (PD). Methods: Subjects were male PD, age 25-52: 13 with ischemic heart disease(IHD), 12 hypertensives (HTN), 10 borderline hypertensives (BHTN) and 34 normotensives (NTN), and 23 non-PD controls. LÄS MER