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Power quality is an important issue for the distribution network companies. They must guarantee the electricity supply fulfilling the requirements for the consumers. In this thesis we investigate specifically voltage requirements. We use transformers and tap changers to see how the voltage works in an electric system and we analyze the relationships with other aspects of the system’s performance,
Various renovations were applied to the existing post-war building stock of the so called “Swedish Million Program”, that were built during the 1965 and 1974 period. Only 20% of those buildings were renovated and still the rest of them remains in need of vast renovations, to mitigate the climatic impact of the existing building stock. Nowadays, the annual rate of large-scale renovation in EU count
The conditions for legality of European Community action raise the essential issue as to the limits of Community competence. It is plain that the Community only holds those powers it has been attributed under the Treaty. However, to delimit those powers has proven to be very difficult. This is problem is widely recognised and will be dealt with at the IGC in 2004. While the Community is founded up
Solute transport in the unsaturated zone is a complex process. The first of the two objectives for this study was to examine how it could be conceptualized under different flow conditions. The second objective was to investigate how the time domain reflectometry (TDR) technique should be used in order to obtain high quality data from the soils studied. The TDR is an accurate instrument for water c
OBJECTIVE: The influence of the gastrointestinal (GI) microflora in patients with irritable bowel syndrome (IBS) has not been clearly elucidated. This study was undertaken to see if patients with IBS have an imbalance in their normal colonic flora, as some bacterial taxa are more prone to gas production than others. We also wanted to study whether the flora could be altered by exogenous supplement
Aim The intention with this study was first to investigate and describe the broad-scale geographical patterns of species richness of breeding shorebirds (Charadriiformes; families: Charadriidae, Scolopacidae and Haematopodidae) throughout the arctic tundra biome. Secondly, after compensating for the positive relationship between net primary productivity (NPP) and species richness, the relative imp
The conditions for legality of European Community action raise the essential issue as to the limits of Community competence. It is plain that the Community only holds those powers it has been attributed under the Treaty. However, to delimit those powers has proven to be very difficult. This is problem is widely recognised and will be dealt with at the IGC in 2004. While the Community is founded up
Cochabamba in Bolivia is an example of a city that faces increasing environmental problems and health risks due to insufficient sewage system coverage and municipal wastewater treatment. The situation is especially severe in peri-urban fast growing settlements. A decentralized alternative to conventional wastewater treatment plants is constructed wetlands with horizontal subsurface flow (HSF). Thi
Atrial fibrillation (AF) is the most prevalent arrhythmia, increasing with each year. AF is characterized by periods of rapid and irregular beating of the heart and increases the risk of stroke and heart failure. The disease often originates from ectopic beats generated by the pulmonary veins, activating the atria, creating short periods of AF. Without treatment the disease evolves, remodels the a
In this master thesis, the topic of energy storage connected to concentrator photovoltaic power production is assessed. The end goal is to propose the optimal energy storage technology and its sizing, regarding power and energy capacity, for an existing concentrator photovoltaic power plant. The plant is located in the province of Algarve in Portugal, the installed production capacity is 4.5 MW, a
Att byggsektorn står inför ett rådande klimatnödläge är ett faktum. Idag investeras hundratals miljarder kronor för att i framtiden kunna producera fossilfritt stål; trots det läggs lite fokus på miljöoptimering av konstruktioner. Syftet med arbetet är att utvärdera hur parametrisk design kan användas som verktyg för att miljöoptimera stålstommar i industritrapptorn samt undersöka vilken profiltypThe fact that the construction sector faces a prevailing climate emergency is undeniable. Today, hundreds of billions of kronor are being invested to develop fossil-free steel; yet little focus is placed on environmental optimization of constructions. The purpose of this work is to evaluate how parametric design can be used as a tool for environmental optimization of steel staircase towers, as wel
Suicide among children and young adults is a leading cause of mortality, highlighting the importance of the development of life-saving interventions. This study is part of the nationwide study Retrospective investigation of health care utilization of individuals who died by suicide in Sweden in 2015, Lund University, Sweden. The aim was to gain a better understanding of verbal suicidal communicati
Acoustofluidics utilizes a combination of acoustics, in the form of ultrasound, and microfluidics to manipulate cells and particles. This has proven to be a versatile method that is gentle to the cells. In this thesis acoustofluidics has been used for processing rare cells in continuous flow. Rare cells are within this thesis defined as cells that are present in numbers of 1-1000 per mL in a much
The diversity among Swedish university students is steadily increasing. The students have different backgrounds, experiences, interests, learning styles and abilities. Also, there are more students with disabilities at Swedish universities, especially invisible disabilities. Teachers need to adapt their teaching and curricula, and can no longer wait to do this until they spot a student with divers
Hydroxyl radicals (HO•), produced through reactions between H2O2 and iron oxides, drive biogeochemical transformations, mediate organism toxicity, and facilitate advanced oxidation processes. The effectiveness of these processes depends on the spatial proximity between HO• generation and target substrates. Consequently, the oxidation mechanisms should be governed by interfacial interactions among
Many coastal areas in Vietnam suffer from erosion. One of the worst affected areas is the Hai Hau beach, located in the Red River delta in northern Vietnam. Over the last hundred years, vast parts of the beach have eroded at an average rate of approximately 25 m per year. Important agricultural land has vanished into the sea and families have been forced to abandon their houses. The cause of the
Wheat bran, a major by-product of wheat processing, contains several valuable components that can serve as a potential feedstock for chemical production. This study presents a multiple-stage fractionation method, involving steam explosion and hydrotropic extraction, which were investigated with the goal of separating the main structural bran components: starch, protein, hemicelluloses, lignin, and
Background: Environmental noise is an important environmental exposure that can affect health. An association between transportation noise and breast cancer incidence has been suggested, although current evidence is limited. We investigated the pooled association between long-term exposure to transportation noise and breast cancer incidence. Methods: Pooled data from eight Nordic cohorts provided
Background: Despite substantial progress in the field of mass spectrometry, there remain barriers to measuring the extracellular vesicles (EVs) proteome in blood plasma. Recent work has shown that isolating EVs can make it possible to detect proteins that have low abundance in plasma. Commonly used EV isolation methods either require large sample volumes and long ultracentrifugation times, or else
Cracks in concrete compromise structural integrity by exposing steel reinforcement to corrosion agents, shortening its service life. Fungal-induced calcium carbonate (CaCO3) precipitation via urea hydrolysis offers a fast and robust self-healing mechanism to seal the cracks, extending the lifespan while reducing the carbon (C) footprint of concrete infrastructure. However, current studies rely on
