Sökning: "iterative methods"

Visar resultat 21 - 25 av 307 avhandlingar innehållade orden iterative methods.

1. 21. Study of Mutual Coupling in Finite Antenna Arrays for Massive MIMO Applications

   Författare :Tomislav Marinovic; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; multiple scattering; Massive MIMO; mutual coupling MC ; 5G; iterative methods; base station antenna BSA ;

   Sammanfattning : This thesis focuses on the study of mutual coupling (MC) in finite antenna arrays for base station antennas (BSAs) for Massive multiple-input multiple-output (MIMO) applications, with an emphasis on the development of a computationally-efficient modeling technique for the analysis of MC which can be readily applied in the design or synthesis schemes for BSAs. Traditionally, the effects of MC have been ignored or underestimated in the analyses performed within the information-theoretic-based communities by assuming idealized antenna elements with no MC between them or by considering the fictitious isotropic radiator models. LÄS MER

3. 22. Är det bara jag? Om sexism och rasism i läkarutbildningens vardag : erfarenheter, förklaringar och strategier bland läkarstudenter

   Författare :Emelie Kristoffersson; Katarina Hamberg; Carita Bengs; Jenny Andersson; Katja Gillander Gådin; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; medical education; medical students; clinical training; specialty preference; qualitative methods; mixed methods; everyday sexism; everyday racism; gendered microaggressions; racial microaggressions; family medicine; allmänmedicin;

   Sammanfattning : Background: Medical education is characterized by unequal conditions for women/men and white/racialized students. Even subtle interactional processes of inclusion and exclusion convey messages about who rightfully belongs in medical school. Insights into these processes, though, are scarce – especially in the Swedish context. LÄS MER

4. 23. Development and Validation of a Numerical Tool for the Aeromechanical Design of Turbomachinery

   Författare :María Angélica Mayorca; Torsten Fransson; Damian Vogt; Eric Seinturier; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aeromechanical design; turbomachinery; numerical tool; reduced order modeling; mistuning; ROM; aero-structure coupling; CFD; FEM; methods; Mechanical energy engineering; Mekanisk energiteknik;

   Sammanfattning : In aeromechanical design one of the major rules is to operate under High Cyclic Fatigue (HCF) margins and away from flutter. The level of dynamic excitations and risk of HCF can be estimated by performing forced response analyses from blade row interaction forces or Low Engine Order (LEO) excitation mechanisms. LÄS MER

5. 24. Implementation of the spectral element method and iterative solution techniques for 3D controlled-source electromagnetic modelling

   Författare :Michael Weiss; Thomas Kalscheuer; Michael Becken; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Controlled source electromagnetis; Electromagnetic theory; Numerical modelling; Applied geophysics; Geo-Electromagnetics; Spectral element method; Iterative solution methods; Preconditioning;

   Sammanfattning : Controlled-source electromagnetic methods are imaging techniques applied at/on the surface of the Earth which record the electromagnetic field in order to assess the electrical conductivity distribution of the Earth’s subsurface, along with anomalies in this material property, as well as to characterise and interpret structures in Earth’s crust. Extracting information from the recorded electromagnetic data requires inverse modelling algorithms. LÄS MER

7. 25. Iterative Methods for Solving the Cauchy Problem for the Helmholtz Equation

   Författare :Lydie Mpinganzima; Vladimir Kozlov; Bengt Ove Turesson; Fredrik Berntsson; Daniel Lesnic; Linköpings universitet; []
   Nyckelord :;

   Sammanfattning : The inverse problem of reconstructing the acoustic, or electromagnetic, field from inexact measurements on a part of the boundary of a domain is important in applications, for instance for detecting the source of acoustic noise. The governing equation for the applications we consider is the Helmholtz equation. LÄS MER