Sökning: "elliptical"

Visar resultat 1 - 5 av 66 avhandlingar innehållade ordet elliptical.

1. 1. Rank Estimation in Elliptical Models : Estimation of Structured Rank Covariance Matrices and Asymptotics for Heteroscedastic Linear Regression

   Författare :Kristi Kuljus; Silvelyn Zwanzig; Dietrich von Rosen; Jana Jureckova; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; elliptical distributions; multivariate ranks; rank covariance matrix; linear rank regression; heteroscedastic errors; linear rank statistics; Mathematical statistics; Matematisk statistik;

   Sammanfattning : This thesis deals with univariate and multivariate rank methods in making statistical inference. It is assumed that the underlying distributions belong to the class of elliptical distributions. LÄS MER

3. 2. Prediction of traction in EHL contacts operating in the linear isothermal region

   Författare :Yuko Higashitani; Andreas Almqvist; Marcus Björling; Sanemasa Kawabata; Alessandro Ruggiero; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elastohydrodynamic lubrication EHL ; Friction; Traction; Modelling; Simulation; FEM; Rolling sliding; Elliptical; Machine Elements; Maskinelement;

   Sammanfattning : The vehicle industry plays an important role in moving people and goods all over the world. Unfortunately, the vehicular transportation has a huge (negative) impact on the climate. Improved fuel-efficient vehicle technologies are therefore required to reduce emissions and address environmental concerns. LÄS MER

4. 3. Elliptical Adaptive Structuring Elements for Mathematical Morphology

   Författare :Anders Landström; Jesús Angulo; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal Processing;

   Sammanfattning : As technological advances drives the evolution of sensors as well as the systems using them, processing and analysis of multi-dimensional signals such as images becomes more and more common in a wide range of applications ranging from consumer products to automated systems in process industry. Image processing is often needed to enhance or suppress features in the acquired data, enabling better analysis of the signals and thereby better use of the system in question. LÄS MER

5. 4. Study of the Superconducting Medium Beta Cavity of the European Spallation Source

   Författare :Saeid Pirani; Partikel- och kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SRF elliptical cavity; higher order mode; Qext; field emission; elliptical cavity design; vertical test; Fysicumarkivet A:2020:Pirani;

   Sammanfattning : The thesis explains the design, fabrication, vertical test, higher order mode (HOM) and field emission study of the ESS superconducting medium beta (MB) cavity. The ESS MB cavity is a 6-cell elliptical cavity. The main criteria for a multicell elliptical cavity design are explained. The multicell elliptical cavity fabrication process is discussed. LÄS MER

7. 5. Propagation of weak shock waves in an elliptical cavity

   Författare :Göran Gustafsson; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

   Sammanfattning : The propagation of weak shock waves in a planar elliptical cavity is studied theoretically and experimentally. The results are of interest in the design of an elliptical high-speed water jet generator operating in a transient fashion with electrically generated shocks in the acoustic regime. LÄS MER