Sökresultat

Raman spectroscopy is well known as a method that can be used to study the structural characteristics of carbon materials such as soot and carbon black. In this work, a Raman spectroscopy setup was used to record spectra of various carbonaceous samples under different experimental conditions. The wave-number range of interest was from 900 to 3300 cm-1, which includes the first and second order Ram

Tissue-mimicking phantoms are of great interest in the development of bio-medical applications. Instead of applying to biological tissues directly, phantoms enable stable and easy accessibility to validate spectroscopy systems and measuring processes. This thesis project is centered on the development and characterization of phantoms. The interaction between light and biological tissue is mainly

The white light LEDs of today are usually based on a blue LED and a phosphor, converting the blue light to longer wavelengths. While these phosphor-converted LEDs are extremely efficient compared to incandescent light or fluorescent light, there is still plenty of room for improvement. In the conversion between blue light and light of lower energy approximately 25-45 % of the radiant power is lost

In peritoneal dialysis ultrapure water used is produced from tap water by using several filter cartridges in series. One of the cartridges is an ion exchange filter removing cations and anions by either reverse osmosis membrane or chemical ion exchange resin. The ion exchange filter that is investigated in this thesis is a chemical ion exchange filter. The current chemical ion exchange system has

The core objective of this project was to design a controller for a drone (or quadcopter) that would allow the drone to keep a target in the center of a video filmed by a camera mounted on the drone. This was done by controlling the pitch of the gimbal, on which the camera was placed, and the yaw of the entire drone combined with using an image recognition program that could identify the target. F

Materialegenskaper som hållfasthet och duktilitet har historiskt förbättrats genom att materialet modifieras homogent, men även kompositer har vuxit fram som ett vanligt verktyg inom industrin som sätt att förbättra materialegenskaper. En alternativ metod som bygger på att materialets mikrostruktur modifieras heterogent, är harmoniskt strukturerade material. Det består av två olika moder av materMaterials are constantly sought to be improved in different manners. Two of the most common characteristics to improve are strength, and ductility. Historically, materials are modified homogeneously to achieve improvement, while the past century has also seen composite materials becoming standard-issue within various industries. Just recently the concept of heterogeneously modifying material micr

The pentadentate ligand 2-(pyridine-2-yl)-N,N-bis(pyridine-2-ylmethyl)quinoline-8-amine was isolated and characterized. Mononuclear iron(II) complexes of the ligand have been synthesized and characterized. Three iron complexes, [Fe(CH3CN)L1][OTf2], [Fe(OTf)L1] and [Fe(Cl)L1][Cl6Fe2O] (L1 = 2-(pyridine-2-yl)-N,N-bis(pyridine-2-ylmethyl)quinoline-8-amine) (OTf = triflate, trifluoromethane sulfonate)

Fibrosis is a process characterized by the accumulation of extracellular matrix components and is attributed to excessive scar formation and is a common feature of many chronic inflammatory conditions. Fibrogenesis involves multiple inflammatory cells including NKT cells, which have been suggested to play a prominent role in the control of this process. Here we characterize a transgenic mouse mode

Plant-insect interactions play a crucial role in the evolution of the coevolving web of life, shaping local interaction networks and moulding the diversity and the evolutionary history of two of the most diverse groups of organisms on earth. The interaction between Lithophragma bolanderi (Saxifragaceae), which presents a geographic mosaic of ploidy levels, and the pollinating floral parasite Greya

This study compares the performance of equal- and value-weighted portfolios using a broad investment universe consisting of the stocks from the Swedish stock market. While implementing random sampling in the portfolio construction procedure, three rebalancing schemes are applied on the equally weighted portfolio in order to observe differences in performance among these. In order to compare how mu

The main purpose of this thesis is to increase the understanding of how hydrogeological conditions are affecting the local water resources in Carrizal on the Barva Volcano, Costa Rica. Hydrogeological investigations of spring characteristics, soil infiltration rates and water flow in springs and rivers were conducted at the study area in Costa Rica as part of a Minor Field Study (MFS). A statistic

From astrophysical and cosmological observations, it is known that most of the matter in the Universe is dark. This matter could be explainable by new particles, not included in the Standard Model of Particle Physics. This work assumes that there exists an interaction between dark matter and Standard Model particles, and investigates if the present relic density of dark matter in the Universe coul

It is known that consumption of high fat diet may lead to gut dysbiosis and increase intestinal permeability by altering gut microbiota composition. However, metabolites from dietary fiber fermentation, short chain fatty acids (SCFAs) may prevent these changes. SCFAs are of great importance in maintaining colonic integrity, and exerting anti-inflammatory function as signaling molecules. The presen

Inclusive innovation is seen as a means to counteract the issue of growing global inequality. Particularly universities and private businesses are engaged with its promotion. However, the concept of inclusive innovation has deficiencies concerning the operationalisation and measurement. In default of extensive primary data, a set of a hundred and two inclusive innovations has been gathered from tw

This study analyzes the relationship between education, antibiotic consumption and antibiotic resistance in the European ambulatory care. For this purpose, a panel data analysis is conducted on an aggregate level in a sample of 30 countries in the European Economic Area between 2000 and 2014. The main variable of interest is the level of high education, expressed as the proportion of the total pop

Wireless communication nowadays is playing a vital role in real-life data transmission. This communication can be machine-to-machine or human to machine communication. In each of these categories, reliability and low latency data transmission are critical factors of success transmission in case the number of devices in a certain area increases. In this thesis, I mainly investigate on smart manufac

Traditionally Bhutanese buildings are built with rammed earth. These buildings have low insulation values and lack thermal comfort resulting in sub-zero temperatures inside the homes in colder regions. Modern insulation materials in Bhutan are uncommon due to the lacking availability, and therefore, a local source of insulation material is needed to improve the living conditions. The worldwide use