Now showing items 1-10 of 5245
Formability of aluminium alloy subjected to prestrain by rolling
(Doctoral thesis at NTNU;2014:363, Doctoral thesis, 2014)
The purpose of this thesis was to improve the understanding and the accuracy of the description of metal sheet formability following the needs of the automotive industry. In particular, the effects of plastic anisotropy ...
An immersed interface method for two-dimensional modelling of stratified flow in pipes
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:139, Doctoral thesis, 2004)
<p>This thesis deals with the construction of a numerical method for solving two-dimensional elliptic interface problems, such as fully developed stratified flow in pipes. Interface problems are characterized by its ...
The impact of oncogenic signaling on the metabolomics of melanoma and prostate cancer
(Doctoral thesis at NTNU;2016:15, Doctoral thesis, 2016)
Thoracoabdominal aortic aneurysm repair: Operative technique, pathophysiology and results of treatment
(Doktoravhandlinger ved NTNU, 1503-8181; 2006:98, Doctoral thesis, 2006)
Young & Active: development and evaluation of an internet intervention to increase fitness and health-related quality of life in adolescents with overweight and obesity
(Doctoral thesis, 2015)
Overweight and obesity among adolescents may have consequences with potentially lasting effects on health and health-related quality of life (HRQoL). Excess weight is also associated with decreases in physical activity ...
On the Design and Optimization of OFDM Systems
(Doktoravhandlinger ved NTNU, 1503-8181; 2006:196, Doctoral thesis, 2006)
<p>In this thesis, some selected aspects of OFDM systems have been investigated. We focus on the modulation and demodulation techniques, such as efficient equalization, robustness to carrier frequency offset (CFO) and CFO ...
Two Weight Discrete Hilbert Transforms and Systems of Reproducing Kernels
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:124, Doctoral thesis, 2011)
<p>The Hilbert transform has become increasingly popular over the years due to its wide ranging applications not only in mathematics, but also in many other applied areas. In a quest for more applications, studying various aspects of its two weight forms has been a subject of high interest as early as the 1970’s. Of special interest is the interface of the Hilbert transform with the notions of Carleson measures and the system of reproducing kernels in spaces of analytic functions. Though these notions have proved to be of fundamental importance and ubiquitous in the development of function theoretic spaces, their properties for many significant spaces, including the model subspace of the Hardy spaces H<sup>2</sup> ;have not yet been well understood. The present thesis focuses on this interface and provides answers to several problems encompassing them.</p><p>The thesis consists of five chapters. The first chapter provides an up-to-date review of the relevant background literature. The remaining chapters contain results that have been published by, or intended for, international journals.</p><p>The work in chapter two covers the problems of unitarity, invertibility, boundedness, and surjective mapping properties of the two weight discrete Hilbert transforms, and a complete solution is obtained for the first one. Our solutions for the remaining problems are complete under a sparsity priori growth condition. Under such a condition, we describe bounded two weight Hilbert transforms in terms of a relatively simple A<sub>2</sub> conditions. As a consequence, computable geometric criteria have been established for invertibility of such maps. Chapter two also provides all the basic underpinnings for the materials presented in Chapter three and Chapter four, where links have been established to interpolate all our results on the weighted transforms into statements about Carleson measures and systems of reproducing kernels in certain Hilbert spaces, of which de Branges spaces and model subspaces of H<sup>2</sup>; are prime examples. As an application, a connection to the Feichtinger conjecture, which is known to be equivalent to dozens of other conjectures including the famous Kadison–Singer problem, is pointed out and verified for certain classes of spaces.</p><p>Chapter five deals again with normalized reproducing kernel Riesz bases in model subspaces of H<sup>2</sup> generated by the class of meromorphic inner functions. In this chapter, the approach to studying such bases digresses somewhat from the methods used in the preceding chapters. Here, we study the normalized kernel bases from an equality of spaces perspective. It is known that such bases can be described in terms of equality of spaces whenever the kernels are associated with points all from the real line. When the points are from the upper half-plane, it is now proved that the analogous conditions may still be sufficient while failing to be necessary.</p>...
Langtransport og avsetning av organiske miljøgifter i nordvestlige Europa
(PhD Thesis;2014:90, Doctoral thesis, 2015-02-16)
Persistent organic pollutant (POPs) are toxic compounds which typically consist of one or more groups of hydrocarbons that are aromatic or aliphatic as well as halogenated (chlorine, bromine, fluorine). POPs are normally ...
Venner på tur: naturguiding som relasjonell kunnskap
(Doctoral thesis, 2015)
Avhandlingens tema er naturguiding. Temaets aktualitet relateres til det naturbaserte reiselivet i Norge, der vekst og internasjonal konkurranse har bidratt til å skjerpe kravene til kunnskap om helse, miljø og sikkerhet ...
Empirical Papers on Public Opinion, Party Competition, and Income Redistribution in Developed Democracies
(Doktoravhandlinger ved NTNU, 1503-8181; 2009:265, Doctoral thesis, 2009)