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In induction heating processes with complex workpiece geometries or stringent requirements, more than one induction coil is usually needed to obtain acceptable results. One objective could be to achieve uniform heating, with minimal temperature variations throughout the workpiece. One frequency converter for each induction coil could be used, but it would not be cost-effective, and instead, it is
Vätgas är en energikälla som har en energidensitet (per massa) tre gånger så stor som naturgas. Detta gör så att vätgas är en huvudkandidat för morgondagens bränsle. Ett av de viktigaste forskningsområderna för vätgas innefattar produktion av vätgas eftersom det finns en stor mängd metoder för vätgasproduktion. Återvinnbar vätgas kan potentiellt produceras med vattenelektrolys, som undersöks i detHydrogen gas is an energy source that has an energy density (per mass) that is three times as large than the energy density of natural gas. This qualifies hydrogen gas as a prime candidate for the fuel of tomorrow. One of the main research areas for hydrogen include the production of it as there are a vast amount of methods of hydrogen production. Renewable hydrogen can potentially be produced thr
I Sverige har flertalet naturolyckor inträffat genom tiderna och det är även idag vanligt med olika typer av naturolyckor. Dessa förväntas i framtiden inträffa mer frekvent och bli allt mer omfattande till följd av klimatförändringarna. Naturolyckor kan kategoriseras som geologiska, biologiska och hydrometeorologiska. Den sistnämnda är väderrelaterade olyckor och i många fall blir den kommunala räIn Sweden, natural disasters have been occurring for many years and will continue to do so in the future. Not all types of natural disasters are possible in Sweden. This thesis will therefore focus on natural disaster that are more likely to occur in Sweden, based on previous incidents and predictions for the future, namely forest fire and floods. In this thesis, an investigation of municipal Fire
Unmanned vehicles need robust systems to ensure the safety of the vehicle and its environment. Being able to find and avoid perilous situations is paramount to such a system. In this paper we suggest an unsupervised image-based anomaly detection algorithm using a variational autoencoder and a superpixel segmentation algorithm, which is adapted to the maritime obstacle detection task. The algorithm
Although reinforcement learning has gained great success in computer games, there are only few yet known implementations in ndustrial applications. This despite the fact that reinforcement learning offers interesting methods to optimise the control of nonlinear processes. In this thesis we have used two model free reinforcement learning algorithms (PPO and DDPG) to control three different simulati
In this thesis, a study is made into relative positioning and control systems for flying wing Micro Aerial Vehicles (MAVs) intended to be used by the Swedish Sea Rescue Society (SSRS) for the purpose of providing assistance during sea rescue missions. The particular scenario of interest is robust relative positioning to be used for autonomous landing of a MAV on a boat at the end of a rescue missi
Evaluating suppliers is something that the majority of companies has to do and is something that often is a complex problem with many parameters and variables involved. This is especially true for a company like Kiviks Musteri that purchases a variety of different products from all over the world from different types of suppliers that come from different cultures and backgrounds. It is also essent
The world has been affected by a pandemic virus called SARS-CoV-2 and caused a high level of deaths. Does the level of relative humidity have an effect on the spread? Different levels of the relative humidity has different affection on humans from a medical aspect. Is there an optimal level of the relative humidity? In this report there is a study on how the level of relative humidity indoor affec
Abstrakt Bakgrund: I takt med att förlossningsvården centraliseras och avståndet till förlossningsavdelningar ökar kommer ambulanssjuksköterskor troligtvis att behöva assistera vid fler prehospitala förlossningar. Med begränsad utbildning och erfarenheter kan sådana situationer upplevas stressande. Syfte: Att undersöka ambulanssjuksköterskors upplevelser och erfarenheter av prehospitala förlossnin
Bakgrund: En del av uppdragen som ambulanssjukvården utför handlar om olyckor, skador eller akut sjukdom som sker i offentlig miljö. Detta innebär att det vårdande utrymmet delas med allmänheten. För sjuksköterskan innebär detta en utmaning. Genom att studera sjuksköterskors upplevelser av att vårda i offentlig miljö kan det skapas ökad förståelse för sjuksköterskors situation i ambulanssjukvården
Bakgrund: hot, våld och misshandelsbrott mot barn under 18 år har blivit ett mer förekommande problem i det svenska samhället med ökat antal orosanmälningar. Hälso- och sjukvårdspersonal ska enligt socialtjänstlagen anmäla om barn misstänks/far illa. Ambulanssjuksköterskor ska kunna identifiera och agera om misstanke finns att barn far illa samt informera vårdnadshavare om att orosanmälan ska göraBackground: threat, violence and assault offences against children under the age of 18 has become an occurring issue in the swedish society with increases of report of concerns. Healthcare workers are obliged to Socialtjänsten to write a report of concern if there’s a suspicion a child is abused. Paramedic nurses must be able to identify and act if there’s a suspicion that a child and/or children
Graph databases are a modern and efficient way of dealing with large amounts of interrelated data. The company provides a software platform that collects, documents and visualizes data for a large variety of businesses. With a new major update in the works, the company proposed a new feature in the product which will be used by both in-house developers and customers alike. There is a need for a us
In this work, a method to estimate the weld-zone temperature during induction welding of carbon fiber reinforced plastics (CFRP) is developed. Today several methods exist to measure, or in other ways ensure, the correct temperature in the weld. However, these methods all have some form of drawback ranging from leaving foreign material in the weld to complex sensor arrangements. The induction weldi
The European Spallation Source, ESS, is a project currently with 17 Partner Countries, and with Sweden and Denmark as host nations. The ESS main facility is being constructed in Lund, to ultimately become the world’s most powerful neutron source, providing around 30 times brighter neutron beams than any earlier facility. The Linear Accelerator, Linac, at the heart of ESS is fundamentally powered
The wood pulp industry has been around for a long time, but new higher quality pulp require more advanced solutions to old processes. One of these processes is the peroxide (PO) bleaching process, which is the last of a whole chain of bleaching processes at the Mörrum pulp processing plant. The aim of this thesis was to develop and study a model for the peroxide pulp bleaching process, and thereaf
Denna studie ingick i kvalitetssäkring av en behandlingsmottagning i södra Sverige. Syftet med studien var att beskriva hur en grupp kvinnor (N=31) som utsatts för våld i nära relation bedömde sina psykologiska välmående med Outcome Rating Scale (ORS) samt belysa tidiga avbrott i behandlingen. Genom en longitudinell kvantitativ studie, undersöktes kvinnornas skattningar utifrån de fyra första behaThis study is included in a quality assurance of a treatment centre in southern Sweden. Using a longitudinal quantitative study design, a group of women (N=31), exposed to domestic violence, prior to four subsequent therapeutic treatment occasions estimated their psychological well-being based on the Outcome Rating Scale (ORS). Additionally, the study was aimed to illuminate the occurrence of trea
This thesis aims to address the limited spatial focus of existing critiques of British financial imperialism, by analysing the economic relationship between Britain and the Cape Colony,and integrating discreet sets of literature related to British imperialism and the economic history of the Cape Colony. Specifically, focus has centred on the diamond mining industry in Kimberley, which produced som
Ecoist AB utvecklar en prototyp till en trehjulig elbil för två personer. Två komponenter till fordonet har undersökts: den övre bärarmen i den främre hjulupphängningen och en bussning som sitter i denna bärarm. Målet med examensarbetet har varit att se om det finns några funktionella eller ekonomiska fördelar med att tillverka dessa genom 3D-printing. Olika sätt att framställa komponenterna har uEcoist AB is developing a three-wheeled electric car with two seats. Two components for the vehicle have been examined: the upper wishbone in the front wheel suspension and a bushing that is mounted in this wishbone. The goal of the thesis has been to examine any potential functional or economic advantages of manufacturing these using 3D-printing. Different ways of producing the components have be
Bakgrund: Samverkan mellan ambulansverksamheten och polisorganisationen är vanligt förekommande i prehospitala sammanhang. Eftersom verksamheterna följer olika lagar, direktiv och riktlinjer kan sätten att samverka skilja sig åt. Aspekter av betydelse för en väl fungerande samverkan var kommunikationsutbyte, samarbete, och korrekt informationsöverföring. Syfte: Syftet med studien var att undersök
