Results
repositories = "Linköping University Electronic Press"
> : "Physics"
(x)
Magneto-optical studies of dilute nitrides and II-VI diluted magnetic semiconductor quantum structures
Author(s) :
Dagnelund, Daniel
Description :
This thesis work aims at a better understanding of magneto-optical properties of dilute nitrides and II-VI diluted magnetic semiconductor quantum structures. The thesis is divided into two parts. The first part gives an introduction of the research fields, together with a brief summary of the scient...
Repository :
Linköping University Electronic Press
Language(s) :
English
Miniprojects and Context Rich Problems : Case studies with qualitative analysis of motivation, learner ownership and competence in small group work in physics
Author(s) :
Enghag, Margareta
Description :
This thesis reports case studies of students working with context rich problems (CRP) and mini projects (MP) in physics in an upper secondary school class and in a physics teacher education class at university. The students report a big shift from physics in secondary school as fun and easy, to phys...
Repository :
Linköping University Electronic Press
Language(s) :
English
Analys av ljudspektroskopisignaler med artificiella neurala eller bayesiska nätverk Analysis of Acoustic Spectroscopy Signals using Artificial Neural or Bayesian Networks
Author(s) :
Hagqvist, Petter
Description :
Vid analys av fluider med akustisk spektroskopi finns ett behov av att finna multivariata metoder för att utifrån akustiska spektra prediktera storheter såsom viskositet och densitet. Användning av artificiella neurala nätverk och bayesiska nätverk för detta syfte utreds genom teoretiska och praktis...
Repository :
Linköping University Electronic Press
Language(s) :
Swedish
Calculation and analysis of DQE for some image detectors in mammography
Author(s) :
Sandborg, Michael
Description :
The development and clinical testing of digital detector designs for mammography are making rapid progress and there is widespread interest in comparing the performance of these new detectors to that of analogue screen-film mammography systems. In this report, Monte Carlo calculations of the x-ray a...
Repository :
Linköping University Electronic Press
Language(s) :
English
Comparison of clinical and physical measures of image quality in chest PA and pelvis AP views at varying tube voltages
Author(s) :
Ullman, Gustav
,
Sandborg, Michael
,
Tingberg, Anders
,
Dance, David R
,
Hunt, Roger
,
Alm Carlsson, Gudrun
Description :
Image quality in digital chest PA and pelvis AP was assessed using two different methods; one based on observations of images of an anthropomorphic phantom, one based on computer modelling using an anthropomorphic voxel phantom. The tube voltage was varied within a broad range (50-150 kV), including...
Repository :
Linköping University Electronic Press
Language(s) :
English
Studies of Light Emission from N-B doped 6H-SiC
Author(s) :
Reimers, Petra
Description :
The purpose of this thesis work was to find a way to measure basic light emission properties of nitrogen-and-boron-doped 6H-SiC, which are fabricated with a growth method developed at Linköping University. The research is in its initial phase and the light properties as well as optical measurement t...
Repository :
Linköping University Electronic Press
Language(s) :
English
Optical Studies and Micro-Structure Modeling of the Circular-Polarizing Scarab Beetles Cetonia aurata, Potosia cuprea, Liocola marmorata
Author(s) :
Gustafson, Johan
Description :
The aim of the work presented in this thesis is to contribute to a fundamental understanding of polarizing phenomena in some scarab beetles. The aim is also to study the beetle structures as inspiration in fabrication of artificially sculptured films. The three investigated species Cetonia aurata, P...
Repository :
Linköping University Electronic Press
Language(s) :
English
Optimization of LDMOS Transistor in Power Amplifiers for Communication Systems
Author(s) :
Kashif, Ahsan-Ullah
Description :
The emergence of new communication standards has put a key challenge for semiconductor industry to develop RF devices that can handle high power and high data rates simultaneously. The RF devices play a key role in the design of power amplifiers (PAs), which is considered as a heart of base-station....
Repository :
Linköping University Electronic Press
Language(s) :
English
Stability of monoatomic nanowires : a first-principles study Ab initio studie av nanotrådars stabilitet
Author(s) :
Gerhardsson, Andreas
Description :
Monoatomic chain formation for Ag, Au, Pd and Pt has been investigated using a model for the tip structure. First-principles calculations, mostly spin polarized, were performed within the framework of the Density Functional theory. Results are presented and discussed on the basis of the electronic s...
Repository :
Linköping University Electronic Press
Language(s) :
English
Growth and Phase Stability of Titanium Aluminum Nitride Deposited by High Power Impulse Magnetron Sputtering
Author(s) :
Lai, Chung-Chuan
Description :
In this work, we investigate the relation between the diffusion behavior of Ti1-xAlxN at elevated temperatures and the microstructure. Thinfilm samples are synthesized by reactive co-sputtering with two cathodes. One cathode equipped with Ti target is connected to a highpower impulse magnetron sputt...
Repository :
Linköping University Electronic Press
Language(s) :
English