Sökning: "Factor analysis"

Visar resultat 41 - 45 av 2832 avhandlingar innehållade orden Factor analysis.

1. 41. Essays on Estimation Methods for Factor Models and Structural Equation Models

   Författare :Shaobo Jin; Fan Yang-Wallentin; Rolf Larsson; Li Cai; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; shrinkage; factor rotation; penalized maximum likelihood; pseudo-maximum likelihood; multi-group analysis; ordinal data; robustness; Statistics; Statistik;

   Sammanfattning : This thesis which consists of four papers is concerned with estimation methods in factor analysis and structural equation models. New estimation methods are proposed and investigated.In paper I an approximation of the penalized maximum likelihood (ML) is introduced to fit an exploratory factor analysis model. LÄS MER

3. 42. Analysis of Deformation of Gas Diffusion Layers and the Impact on Performance of PEM Fuel Cells

   Författare :Jiatang Wang; Värmeöverföring; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PEM fuel cell; compression ratio; assembly pressure; porosity; deformed GDL; electric resistance; transport phenomena; model; performance; analysis; OpenFOAM;

   Sammanfattning : Proton exchange membrane (PEM) fuel cells have been promoted due to significant breakthroughs in various aspects and increasing public interests. The porous features of the gas diffusion layer (GDL) and the necessary assembly processes generate localized pressure forces on the channel/shoulder structure of the bi-polar plates (BPP). LÄS MER

4. 43. Svensk och finsk upphinnartillväxt : Faktorpris- och produktivitetsutjämning mellan Finland och Sverige 1950-2000

   Författare :Jonatan Svanlund; Magnus Lindmark; Christer Lundh; Umeå universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economic history; Sweden; Finland; Convergence; Catch-Up Growth; Productivty; Factor Prices; Wage moderation; Shift-Share analysis; growth accounting; neo-classical growth theory; Economic history; Ekonomisk historia; ekonomisk historia; Economic History;

   Sammanfattning : The aim of this thesis is to gain improved understanding of the income convergence between Finland and Sweden 1950-2000 with a focus on catch-up growth, wage formation, productivity growth, migration and structural change in a setting of structural and institutional differences on the factor markets. Earlier studies of Finnish and Swedish convergence has overlooked the international perspective and therefore missed the general European – US convergence during the period. LÄS MER

5. 44. Run-Up Transient Analysis for Salient Pole Wound Field Synchronous Motors : Field winding and power electronics implications for a smoother and cooler asynchronous start

   Författare :Roberto Felicetti; Urban Lundin; Andreas Binder; Uppsala universitet; []
   Nyckelord :apparent resistance; cable modeling; current control; transmission line model; eddy currents; field winding; frequency analysis response; Fourier Transform; impedance mismatch; main inductance; overvoltage; parasitic capacitance; partial discharge; quality factor; ringing; slew rate; stray inductance; voltage gradient; winding resonance frequency; asynchronous start; run-up; torque ripple; reluctance torque; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

   Sammanfattning : Salient Pole Wound Field Synchronous Machines have better efficiency at full load than asynchronous machines of the same capability. Moreover, where asynchronous machines need inherently to draw a magnetizing current from the grid, Salient Pole Wound Field Synchronous Machines can work efficiently at unity power factor. LÄS MER

7. 45. Design of transverse flux machines using analytical calculations&finite element Analysis

   Författare :Peethamparam Anpalahan; KTH; []
   Nyckelord :Transverse Flux Machine; Power factor; Torque density; Analytical Model; Magnetic powder; Permanent Magnet; Finite Element Analysis;

   Sammanfattning : .... LÄS MER