Sökresultat

Pinus sylvestris (tall) är en betydelsefull trädart i Sverige och Europa, både ekonomiskt och kulturellt sett. Trädet infekteras dock av den destruktiva rottickan (Heterobasidion spp.) vilket resulterar i stora ekonomiska förluster inom skogsindustrin, med en uppskattad monetär förlust på ca 800 miljoner EUR årligen i Europa. Det är svårt att upptäcka svampen i tidiga infektionsstadier eftersom inPinus sylvestris (Scots pine) is an important tree species in Sweden and Europe, both economically and culturally. However, the highly destructive root rot fungi Heterobasidion spp. infect P. sylvestris and cause major economic losses in the forest industry, estimated to about 800 million EUR annually in Europe alone. Detection of the fungus in early stages is hard, as the infection mainly stays i

Inom partikelfysik, går de teoretiska och experimentella aspekterna hand i hand. För att förstå hur partiklar växelverkar med varandra och kunna förstå experimentella resultat, behövs en teoretisk modell av interaktionerna. Feynmandiagram erbjuder exakt detta, ett verktyg för att simpelt visualisera partikelprocesser. Med Feynmandiagram är det möjligt att förstå vilka processer som är möjliga och This thesis explores the simplifications the chirality-flow formalism brings the calculations of scattering amplitudes in massless QED. We explain Feynman diagrams and chirality- flow diagrams to emphasize how the calculations of scattering amplitudes differ. It is studied how applying the chirality-flow formalism simplifies the calculations. The work focuses on calculations with and without exter

Chirality can be understood as a property of an object that cannot be superimposed on its mirror image, such as our left and right hands. It is ubiquitous in nature and can also be found in the photosynthesis process involving chlorosomes from green sulfur bacteria. Understanding the dynamics of chiral properties in chlorosomes, due to the excitons formed by the interaction between bacteriochlorop

The construction industry has always been changing and adapting to new innovations, values, requirements, and goals from the outside world. These days are no different. The climate change is still mostly relevant and everything we could do to mitigate this should be applied in the construction sector. It is nowadays a known fact that buildings represent a significant portion of the carbon dioxide

Heart rate variability (HRV) is a measure of the variation in the time intervals between heartbeats. HRV can provide insights into the condition of the heart as well as the state and interaction of the sympathetic and parasympathetic nervous systems. HRV can be measured over shorter periods (5 minutes) or longer periods (up to 24 hours). Similar to pulse, HRV is linked to respiratory rate. During

I dagens globala samhälle finns en växande efterfrågan på trådlös kommunikation. För att möta denna efterfrågan behöver kommunikationssystemen utvecklas, till exempel genom att använda högre frekvenser som i 5G, öka antalet användare som kan använda systemet samtidigt eller använda större antennsystem. Detta ökar dock risken för störningar mellan användares kommunikationslänkar, vilket leder till As two signals of different frequencies pass through a nonlinear element, they mix and create unwanted spurious signals. This intermodulation phenomenon is well studied for active components but can also occur from the material in passive components and is then called passive intermodulation (PIM). The PIM energy levels are a concern when designing communication technology, especially satellites,

The adoption of virtual meeting platforms significantly increased during and after the COVID-19 pandemic, which was caused by the need for effective remote collaboration and communication tools. As a result of advancements in technology, virtual meeting platforms transformed their integral components into more than just video conferencing tools. A notable example is the integration of speech-to-te

This article focuses on the popular thin-film deposition technique chemical vapor deposition (CVD) and outlines its latest research in improving wear resistance. The article highlights how the wear resistance of thin film coatings can be improved through material selection, process parameter optimization, post-processing techniques and structural design. The combined application of these methods h

Denna avhandling utforskar inverkan av generativ AI på förstärkning av cyberkriminella aktiviteter, särskilt genom skapandet av bedrägligt innehåll och hur det påverkar offrens uppfattning. En serie formella experiment (n = 15) bedömde hur AI-genererat bedrägligt material jämför sig med mänskligt genererade bedrägerier när det gäller att påverka offer, med användning av modellen för sannolikhetsbaThis thesis explores the impact of generative AI on enhancing cybercriminal activities, particularly through the creation of fraudulent content that affects victim perception. A series of formal experiments (n = 15) assessed how AI-generated fraudulent materials compare to human-made frauds in influencing victims, using the elaboration likelihood model (ELM) and related cognitive research. The exp

With a growing global demand for improved surveillance and security, the thermal camera has seen its use cases and market share expand. Unlike the visual camera, the thermal camera does not require external illumination. Instead, it relies on the fact that all matter with a temperature above absolute zero emits thermal radiation. The thermal camera measures intensity, but another characteristic of

α-Galactosidases from Aspergillus nidulans (AglC) and Penicillium subrubescens (PsGal36-2527) are exo-acting enzymes that can be found in the Glycoside Hydrolase (GH) 36 phylogenetic cluster with eukaryotic α-galactosidases. In utilizing enzymes for industrial applications, finding enzymes with a broad range of substrate specificities and high catalytic efficiencies is quite challenging. It has be

Given preschools’ important role in shaping children’s learning and development surprisingly little is known about why some Swedish preschools are much more successful in offering high-quality early education than others. Earlier research has shown that socioeconomic gaps in educational achievements can largely be explained by knowledge gaps established during the preschool years. There may be soc

Introduction: The current Tetra Brik Aseptic packaging contains a polyethylene-aluminium layer that is difficult to recycle. Alternative materials have been explored to eliminate this aluminium layer, resulting in reduced carbon emissions but a 30% shorter shelf life. This trade-off raises concerns about potential increases in food waste due to reduced shelf life. Therefore, this study aims to exp

Syfte: Denna studie syftar till att undersöka och öka kunskapen kring chefers roll i främjandet av den psykosociala arbetsmiljön på arbetsplatser, där distans och hybrid arbete blivit vanligt förekommande under och efter corona-pandemin. Frågeställningar:(1)Hur upplever chefer att deras ansvar för skapandet av en god psykosocial arbetsmiljö har förändrats i samband med det ökade distans- och hybr

Solcellsparker blir både allt vanligare och allt större. I denna studie undersöks hur storleken och antalet transformatorer i en solcellspark påverkar dennas förmåga att leverera el. De rådande klimatförändringarna är en av de största utmaningar mänskligheten ställts inför. Fossil elproduktion är en stor bidragande faktor till utsläpp av växthusgaser globalt. Solceller ser ut att spela en avgöranThe main focus of this thesis has been to examine and compare how the size and number of internal power transformers affects the technical performance (robustness, power quality and efficiency) of a utility-scale PV plant. The technical performance was examined in a simulation environment (MATLAB Simulink), where a PV plant with a fixed number of PV arrays and converters, corresponding to a rated

Denna uppsats handlar i huvudsak om fenomenet celldisruption, att genomföra detta på industriell skala och analysera resultaten. Celldisruption är en process som används mycket brett inom bioteknik då själva processen går ut på att utvinna de intressanta ämnen som producerats i en cell. Idag produceras en stor mängd läkemedel cellulärt men även inom bland annat produktion av tvättmedel, ost och fäThis thesis explored the efficacy of high pressure homogenization for disrupting gram-positive bacteria of the species Lactiplantibacillus plantarum. The focus was on the impacts of homogenization pressure and the number of passes through the homogenizer as well as developing a simple method for measuring cell disruption. Turbidity measurements in combination with microscopy and laser diffraction

This master thesis presents a suggested Renovation Passport for two typical 1960s single-family houses. Following the recently approved Energy Performance of Buildings Directive (EU 2024/1275A), all member states are to implement voluntary Renovation Passports by 2026, which will aid in reaching the 2050 goal of a decarbonized building stock. The aim of Renovation Passports is to provide long-ter

Northern Ireland’s relatively recent history as a state has been marked by decades of ethnonational conflict, euphemised as “The Troubles.” While the signing of the Good Friday Agreement marked the beginning of a period of relative peace and stability, the United Kingdom’s decision to leave the European Union has raised concerns that this peace will be threatened. Academic analysis of society and

Building Information Modeling (BIM) är ett arbetssätt och samlat begrepp som ger möjlighet att visualisera önskad design i verklig storlek och dimensioner (ur olika vinklar och vyer). BIM är en smart teknik och en ny designprocess där all information och konstruktion specifikationer skapas i en digital fil. Så BIM är inte enbart en mjukvara, utan en enorm teknik. För att implementera denna teknik Building Information Modeling (BIM) is a way of working and collective concept that provides the opportunity to visualize the desired design in real size and dimensions (from different angles and views). BIM is a smart technology and a new design process where all information and construction specifications are created in a digital file. So BIM is not just a software, but a huge technology. To imp