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1	Säkerhetsbrytare för Gräsklippare Nyström, Daniel, Walfridsson, Lars January 2007 (has links) <p>This thesis describes teh solution of two problems regarding safety on powered lawnmowers; protectning the users from injury when using the lawnmower in slopes, and when cleaning the cutting blade.</p><p>The task was carried out through initial studies on a representative lawnmower. A generation of ideas followed with an evaluation to select the best solution. The winning concept was further developed to reach acceptable performance. The word resulted in a functioning prototype utilising an original way of detecting inclinations without incorrect signals. It c an serve as a platform for further development into a product.</p><p>The work gives insightful experience of solving real-world problems, and especially to deal with situations where several variables and their effects are unknown</p><p>Please note that several parts of the work are confidential, and have therefore been removed from the thesis.</p> Brytarem lutning detektera säkerhet gräsklippare Product science Produktforskning
2	Säkerhetsbrytare för Gräsklippare Nyström, Daniel, Walfridsson, Lars January 2007 (has links) This thesis describes teh solution of two problems regarding safety on powered lawnmowers; protectning the users from injury when using the lawnmower in slopes, and when cleaning the cutting blade. The task was carried out through initial studies on a representative lawnmower. A generation of ideas followed with an evaluation to select the best solution. The winning concept was further developed to reach acceptable performance. The word resulted in a functioning prototype utilising an original way of detecting inclinations without incorrect signals. It c an serve as a platform for further development into a product. The work gives insightful experience of solving real-world problems, and especially to deal with situations where several variables and their effects are unknown Please note that several parts of the work are confidential, and have therefore been removed from the thesis. Brytarem lutning detektera säkerhet gräsklippare Product science Produktforskning
3	Detection of electron vortex beams : Using a scanning transmission electron microscope Löfgren, André January 2015 (has links) Electron vortex beams (EVBs) are electron beams with a doughnut-like intensity profile, carrying orbital angular momentum due to their helical phase shift distribution. When employed in an electron microscope, they are expected to be efficient for the detection of magnetic signals. In this report I have investigated high angle annular dark field (HAADF) images obtained using EVBs. This was done for 300 K and 5K. For 5 K, I also compared HAADF images from an ordinary electron beam with HAADF images from an electron vortex beam. What was found was that EVBs produced doughnuts around the atomic columns. However, when taking the size of the electron source into account, this phenomena could no longer be observed. When comparing images from EVBs with images from ordinary electron beams, I found that the intensity of scattered electrons around atomic columns was broader for EVBs. This was persistent even after taking the source size into account. / Elektronvirvelstrålar (EVS) är elektronstrålar med en munk-liknande intensitetsprofil. Dessa bär på rörelsemängdsmoment på grund av sin fasdistribution. När de används i ett elektronmikroskop förväntas de vara effektiva för detektering av magnetiska signaler. I denna uppsats har jag undersökt high angle annular dark field (HAADF) bilder som erhållits med hjälp av EVS. Detta gjordes för 300 K och 5K. För 5 K, jämförde jag även HAADF bilder från en vanlig elektronstråle med HAADF bilder från en elektronvirvelstråle. Vad jag fann var att EVS producerade en munkformad intensitetsfördelning runt atomerna. Men när hänsyn till storleken på elektronkällan togs i beaktande kunde inte detta fenomen observeras längre. När bilder från EVS jämfördes med bilder från vanliga elektronstrålar, fann jag att intensiteten av spridda elektroner runt atomkolumnerna var bredare för EVS. Detta kunde observeras även efter att jag tagit hänsyn till elektronkällans storlek. microscopy electron vortex beam microscope detection detecting doughnuts microscopy STEM scanning transsmision mikroskopi elektronvirvelstråle elektronvirvelstrålar elektron stråle virvel munk munkar elektrontransmissionsmikroskop elektronmikroskop transmissionsmikroskop detektera detektering
4	Tekniker för detektion av neutriner med ultrahög energi Ahmedi, Lawen, Ali, Mubarak, Castellanos, Larisa January 2017 (has links) This project highlights various methods used to detect the elongated elemental particle neutrino. It is especially focused on the IceCube observatory, which uses Cherenkov light to detect these particles. Neutrino is an importnant building block in astrophysics and particle physics research as this particle can travel from great distances in time and space without interacting with matter. This means that high-energy neutrinos that are detected can orginate from strong explosions from outer space, even from explosions billion years ago, like Big Bang. This means that these particles carry a huge amount of information about the universe. The project also contains an experiment whose purpose is to demonstrate that with simple materials it is possible to detect particles that are not otherwise visible to the naked eye. Teknik tekniker detektion detektera detektorer detektor observator elementarpartikel neutrino neutriner ultrahög energi fysik astronomi astrofysik kosmisk strålning radiostrålning radiostrålar partikel partiklar Engineering and Technology Teknik och teknologier

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