Search for dissertations about: "NASA"

Showing result 1 - 5 of 14 swedish dissertations containing the word NASA.

  1. 1. A hybrid finite element method for electromagnetics with applications in time-domain

    Author : DAVID DEGERFELDT; [2007]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nitsche s method; antenna arrays; NASA almond; edge elements; scattering; explicit-implicit time-stepping; Maxwell s equations; Finite Element Method; mass lumping; stability analysis; Finite-Differences Time-Domain; periodic structures; shape and material optimization;

    Abstract : In this thesis, a new hybrid method that combines the Finite Element Method (FEM) with the Finite-Difference in Time-Domain (FDTD) method is presented. Tetrahedrons in the unstructured FEM region are connected directly to thehexahedrons in the structured FDTD region. READ MORE

  2. 2. Causes and Consequences of Early-life Conditions : Alcohol, Pollution and Parental Leave Policies

    University dissertation from Uppsala : Department of Economics, Uppsala University

    Author : Jenny Jans; Uppsala universitet.; [2017]
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Air pollution; alcohol availability; parental leave policies; health; educational attainment; earnings; time investments; child outcomes; Economics; Nationalekonomi;

    Abstract : Essay I: This paper studies the effect of air pollution on infant health in Sweden. Combining register panel data on birth outcomes and family characteristics with pollution data, I estimate the effect of particulate matter (PM10) on several birth outcomes that previously have been shown to be predictive of future outcomes. READ MORE

  3. 3. Phase Sensitive Amplifiers for Free-Space Optical Communications

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Ravikiran Kakarla; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Phase sensitive amplifier; sensitivity; optical injection locking; noisefigure;

    Abstract : The demand for high data rate free-space communications is increasing due to the planned future space exploration missions. In the next few years there is a need to increase the speed by 100 times according to NASA, and this necessitates that transmission systems operate at higher carrier frequencies. READ MORE

  4. 4. Thermodynamic Simulation of HCCI Engine Systems

    University dissertation from Combustion Engines

    Author : Olof Erlandsson; Lunds universitet.; Lund University.; [2002]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HAM; Turbine; Compressor; Turbocharger; Engine; Modeling; HCCI; Simulation; Motors and propulsion systems; Motorer; framdrivningssystem;

    Abstract : Popular Abstract in Swedish Avhandlingen omfattar förutom en kort inledning, i huvudsak två delar: (1) Beskrivning av teorin bakom ett datorbaserat verktyg för simulering av termodynamiken i ett motorsystem, där främst motorer med Homogen Kompressionsantändning (Homogeneous Charge Compression Ignition, HCCI) avses. Med system avses förutom själva motorn, turboladdare, laddluftkylare, insug och avgas volymer (samlingsrör) m. READ MORE

  5. 5. Evaluating Readability on Mobile Devices

    University dissertation from Uppsala : Institutionen för lingvistik och filologi

    Author : Gustav Öquist; Uppsala universitet.; [2006]
    Keywords : Computational linguistics; Readability; Mobile devices; Text presentation; Usability; Evaluation; Adaptation; Eye movement tracking; Datorlingvistik;

    Abstract : The thesis presents findings from five readability studies performed on mobile devices. The dynamic Rapid Serial Visual Presentation (RSVP) format has been enhanced with regard to linguistic adaptation and segmentation as well as eye movement modeling. READ MORE