Sökresultat

This thesis consists of six parts in which methods for image analysis and processing are studied. Two-dimensional medical images, image sequences, and three-dimensional image volumes are considered. In the first part, the concept of optical flows (OF) is employed for restoring the contracting/expanding ventricle motion in ultrasonic echocardiograms. Radial velocities obtained by a scalar approach

How does the brain transform the 2-D light arrays in our eyes into a meaningful 3-D description of surfaces around us? What assumptions does the visual system make about the world when information is incomplete? And how are these assumptions computationally expressed in this perceptual reconstruction process? These questions, and other aspects of binocular depth perception are analysed from a theo

Soil contamination is a widespread problem and actions need to be taken in order toprevent damage to the groundwater and the life around the contaminated sites. InSweden more than 80.000 sites are potentially contaminated, therefore there is ademand for accurate and efficient methods for site characterization and soilremediation. In the past, the preferred methodology for soil remediation involved

While pipe biofilms in DWDSs (drinking water distribution systems) are thought to affect the quality of distributed water, studies regarding the microbial processes are impeded by the difficulties in accessing biofilm undisturbed by DWDS maintenance. In this study, pipe sections were removed from a fully operational DWDS for biofilm sampling over two years and three months, and before and after st

Most large tidewater glaciers in Svalbard are known to have surged at least once in the last few hundred years. However, very little information exists on the frequency, timing or magnitude of surges prior to the Little Ice Age (LIA) maximum in ∼1900. We investigate the sediment-landform assemblages produced by multiple advances of the Nathorstbreen glacier system (NGS) in order to reconstruct its

In the first part of this thesis, three intermetallic compounds are discussed, that were originally thought of as thallium iodide type compounds. Starting from small evidence that there is more than meets the eye, investigations began to find the true structure of AuIn. AuIn emerged to be modulated with various domain sizes over temperatures between room temperature and 400◦C, where at room temper

This a contribution to the cultural semiotics of African cultural encounters seen through the eyes of Swedish naturalists at the end of the eighteenth century. European travellers faced severe problems in understanding the alien African cultures they encountered; they even had difficulty understanding the other culture as a culture. They were not just other cultures that they could relate to, but

Popular Abstract in Swedish En indikator-jon för en kvantdator Ända sedan transistorn uppfanns 1948 har datorer blivit allt mer kraftfulla. Trots den enorma utveckling som skett finns det fortfarande problem som är för svåra för en dator att lösa. Ett exempel är simulering av stora molekyler, t.ex. proteiner, vilket skulle vara användbart inom medicin och biologi, bland annat för att förutsäga hRare-earth ions doped into a transparent crystal can have optically excited states with coherence times of milliseconds and hyperfine levels with coherence times of hours when cooled down to liquid helium temperatures. This makes them attractive for developing quantum computing hardware. A quantum transistor can be implemented in a rare-earth-ion-doped crystal by utilizing a dipole blockade effe

Here, we use carbon dioxide (CO2), methane (CH4), carbon monoxide (CO), nitrous oxide (N2O) and radon (222Rn) data from the Saclay ICOS tall tower in France to estimate CO2, CH4 and CO fluxes within the station footprint from January 2017 to October 2024 and N2O fluxes from February 2019 to October 2024 using the Radon Tracer Method (RTM). We first performed a sensitivity study of this method appl

Agroforestry är ett jordbrukssystem där odling av grödor kombineras med träd på samma jordbruksytor. Då den stadigt minskande markbördigheten ses som den främsta begränsningen till ökade skördar, är det nödvändigt för en hållbar matproduktion att näringsämnen som tas upp av grödor från marken, eller försvinner på grund av erosion och urlakning, fylls på. Många länder i Afrika har i flera årtiondenAgroforestry is an agricultural system where crop farming is combined with trees on the same land. The steadily decreasing soil fertility is considered to be the primary constraint to increased crop yields, and it is vital to replenish the nutrients lost by plant uptake or removal by erosion and leaching for a sustainable food production. Several African countries have for tens of years received f

This paper examines the Nordic as an ideological, cultural, and geographical site from which to examine place branding. Although a number of studies have addressed Nordic place brands and branding, the peculiarity of branding within the Nordic welfare states remains understudied (Lucarelli et al., forthcoming 2019). The unusual open access to the field of practice granted to researchers (at least

Frequency Measures in AF. Introduction: Frequency analysis of fibrillation (FAF) and time-frequency analysis (TFA) were developed recently in order to quantify atrial electrical remodeling in atrial fibrillation (AF) from the surface ECG. This article describes the experience with these two different frequency analysis techniques in consecutive AF patients and discusses possible applications in AF

A model of an industrial through-dryer for production of tissue paper was developed. The model can be used to predict the performance of a dryer section of an industrial through-drying machine consisting of one or more through-drying rolls separated by free draw sections. Roll diameters, wrap angles, machine speed, basis weight, initial paper moisture ratio, operating pressure differentials, dryin

Electrical machines, chokes and induction heaters are found in most homes,offices and factories all over the world. They are used to create movement, filtrate the power or to generate heat. A typical unit consist of a coil and a flux conductor material. Some of the materials have been established for over 100 years, while others are only a couple of decades old.A new flux conductor material has be

This essay reflects on the ”-ology of technology”, pace Brian Arthur (2009), as conveyed in theformal (i.e. mathematical) treatment of technology and innovation in economic theory. In thedecades from the 1970s economists of the evolutionary strand have levied criticism on the way inwhich technology is handled in mainstream economics. Some of this criticism has concerned theassumptions made in part

The aim of this thesis is to analyse how members of the Swedish press were represented in different media from the 1870s to the 1930s, how and why the representations were changed, and the way newspaper staff responded to them. The representations of journalists in novels, short stories, movies, press history, press debates, pictures in the funny papers and so on are analyzed as parts of the publi

This study aims to fabricate nanoclay (NC) embedded polyacrylonitrile (PAN) adsorptive electrospun nanofibers (Ads-ESNs) as high performance membranes for organic micropollutants (OMPs) removal. Ads-ESN were tested using a comprehensive protocol included adsorption in batches (static) and during filtration (dynamic). The filtration performance of Ads-ESNs was tested using gravity driven membrane (

This thesis reports on the research undertaken to increase the sustainability of foodmanufacturing by reducing the solid Food waste generation, as well as Energy and Water(FEW) consumptions through applications based of Internet of Things (IoT) concepts. Theprimary objective of this research is to develop an IoT-based framework, which identifies andcollects the key data regarding FEW within food m