Global ETD Search

11	IT-forensisk analys av Windows 8 Kellgren, Christelle, Fransén, Martin January 2013 (has links) En fallstudie tillämpades för att undersöka de inbyggda apparna, Internet Explorer 10, den nya utforskaren File Explorer och reparationsverktyget ”Återställ datorn utan att ta bort filer” i Windows 8. Analysen visade att apparna E-post, Kontakter och Meddelanden sparade större delar av användarens Facebook-profil lokalt på datorns hårddisk. När bildfiler öppnades upp med appen Foton sparades miniatyrbilder av originalet på hårddisken. När videofiler spelades upp med appen Video sparades filnamnet i filer. Databasfilen index.dat som i tidigare versioner av Internet Explorer sparade webbhistorik har tagits bort och ersatts av ESE-databasen WebCacheV01.dat. Precis som föregångaren i Windows 7 sparar File Explorer både snabblistor, genvägsfiler och miniatyrbilder. Digitala spår från det tidigare operativsystemet lämnades kvar efter reparation med ”Återställ datorn utan att ta bort filer” i foldern Windows.old. IT-forensik EnCase 7 Windows 8 Appar E-post Kontakter Meddelanden Foton Video File Explorer Utforskaren Extensible Storage Engine ESE-databas WebCacheV01.dat WebCahceV24.dat livecomm.edb
12	Charakterizace mikropohybu a jeho vliv na systematické posuvy frekvence kvadrupólového přechodu iontu vápníku zachyceného v Paulově pasti / Characterization of micro-motion and its influence on systematic frequency shifts of quadrupole transition of Calcium ion trapped in Paul trap Vadlejch, Daniel January 2020 (has links) This thesis deals with the analysis of micromotion of a single charged calcium ion trapped inside the linear Paul's ion trap and the influence of residual micromotion on the systematic frequency shifts of the clock transition of calcium ion. The fundamental properties of the motion of an ion confined within linear Paul's ion trap are shown in general using a theoretical description. The micromotion component of the overall motion is especially emphasized. A model expressing micromotion in the axial direction of the trap is introduced on the basis of the results of the numerical calculation of electric fields inside the trap. The model is compared to the reality experimentally. Then, the photon-correlation method of detection of micromotion is introduced and subsequently used to minimize and to estimate a measure of residual micromotion in all spacial directions. According to the achievable measure of residual micromotion, the systematic frequency shifts caused by this micromotion are estimated. It can be seen that we are able to reach uncertainties of the relative frequency shifts due to micromotion below 10^20. We expect that uncertainty of total motional systematic frequency shift is in our case limited by thermal motion.
13	Communication and Error Correction via Polarisation of Single Photons and Time Ordering / Kommunikation och felkorrigering via polarisering av enstaka fotoner och tidsordning Leung, Shek Lun January 2023 (has links) This research study aims to investigate the capacity of single photons to carry information through polarization and time ordering and proposes a protocol called Beyond Pulse Position Modulation (BPPM) to improve photon-based communication reliability over longer distances with limited power. Such a protocol may be used in any communication scenario where energy efficiency is important, e.g., in satellite communication or where pulse position modulation (PPM) typically is used. The study compares various metrics such as information bits per symbol, photon, and time bin to evaluate the system’s efficiency and conducts a comparative analysis of BPPM, Pulse Position Modulation (PPM), On-Off Keying (OOK), andGeneral protocol’s effectiveness. (The simulations were conducted using the Python programming language with Visual Studio Code IDE.) / Denna forskningsstudie syftar till att undersöka informationskapaciteten hos enstaka fotoner då dessa kodats med avseende på polarisering och tidsordning. Ett nytt protokoll som kallas Beyond Pulse Position Modulation (BPPM) använder felkorrigering för att förbättra kommunikationstillförlitligheten över längre avstånd med begränsad effekt. Ett sådant protokoll kan användas i vilket kommunikationsscenario som helst där energieffektivitet är viktigt, t.ex. vid satellitkommunikation eller där pulspositionsmodulering (PPM) vanligtvis används. Studien jämför olika mätvärden som informationsbitar per symbol, per foton och per tidslucka för att utvärdera systemets effektivitet och genomför en jämförande analys av BPPM, Pulse Position Modulation (PPM), On-Off Keying (OOK) och ett protokoll med fixt antal fotoner per block avseende protokollens effektivitet. (Simuleringarna utfördes med Python-programmeringsspråket med Visual Studio Code IDE.) Quantum Technology Physics Photon Telecommunication polarization time ordering BPPM PPM OOK Simulation quantum communication Kvantteknologi Fysik Foton Telekommunikation polarisering tidsordning BPPM PPM OOK Simulering kvantkommunikation satellite communication Physical Sciences Fysik
14	Analýza neutronového pole laboratorního AmBe zdroje s využitím měřícího stendu / The AmBe Laboratory Neutron Source Field Determination Using Experimental Stend Jelínek, Martin January 2017 (has links) This master’s thesis provides a comprehensive overview of the conventional neutron sources from the perspective of reactions which lead to the production of neutrons, advantages, disadvantages, properties and their possible utilization. In the relation to the assembly of the laboratory neutron source and the unique experimental stand “Candle” basic methods of the neutron field analysis are outlined and two of them, the neutron activation analysis and the calculation using the MCNP software code are discussed in depth to apply and compare these methods. The experimental part deals with the realization of neutron activation analysis from its design itself, through gamma spectrometry to the cadmium ratio calculation. In compliance with the measurements, a calculation with MCNP code was run and both methods were evaluated and compared. The computation is complemented with the analysis of radiation situation on the borders of the supervised area, which is compared to the legal limit.
15	Optimering av fotonbombardemang inom PAR-området för ökad fotosyntes Hellman, Mikael January 2021 (has links) Fotosyntes är central för vår överlevnad. I denna studie har en artificel ljuskälla reglerats för att optimera fotonintensiteten då intensiteten från solen varit för låg. Fokus är lagt på PAR-vågbandet vilket är de våglängder som anses ha störst inverkan på fotosyntes. En kalibrerad sensor användes för att ge pålitliga mätvärden av fotonintensiteten. En billig sensor konstruerades för mätning av densamma och även manuell mätning med lux-meter där värdena konverterades till fotonintensitet. För att studera hur tillväxten påverkas av fotonintensiteten har en testgrupp och en kontrollgrupp med morötter används. Morötterna placerades i ett växthus under liknande förutsättningar med avseende på till exempel näring och värme. Testgruppen fick tillgång till artificellt ljus då intensiteten från solen var för låg under dagstid. Kontrollgruppen fick endast tillgång till solljus. Tillväxten för testgruppen blev större än för kontrollgruppen. För vidare forskning skulle en steglös reglering av fotonbombardemanget kunna optimera processen. Denna förbättring innebär ekonomisk besparing i form av högre biologisk tillväxt vid lägre energiförbrukning. Slutsatsen av denna studie är att optimering av fotonbombardemang kan medföra ekonomisk besparing och även minskad negativ miljöpåverkan på grund av lägre energiförbrukning. / Photosynthesis is central to our survival. In this study, an artificial light source has been regulated to optimize the photon intensity when the intensity from the sun has been too low. The focus is on the PAR waveband, which are the wavelengths that are considered to have the greatest impact on photosynthesis. A calibrated sensor was used to provide reliable measurements of the photon intensity. An inexpensive sensor was designed for measuring the same and also manual measurement with lux-meter where the values were converted to photon intensity. To study how growth is affected by photon intensity, a test group and a control group with carrots were used. The carrots were placed in a greenhouse under similar conditions with regard to, for example, nutrition and heat. The test group gained access to artificial light when the intensity from the sun was too low during the day. The control group only had access to sunlight. The growth for the test group was greater than for the control group. For further research, a stepless regulation of photon bombardment could optimize the process. This improvement means economic saving in the form of higher biological growth at lower energy consumption. The conclusion of this study is that optimization of photon bombardment can lead to economic saving and also reduced negative environmental impact due to lower energy consumption. PAR photosynthesis active radiation control system pho-tonbombardement photosynthesis artificial light photo-nintensity optimization greenhouse building automation. PAR photosynthesis active radiation reglerteknik foton-bombardemang fotosyntes artificellt ljus fotonintensitet optimering växthus byggnadsautomation. Annan elektroteknik och elektronik
16	Naturligt farligt : Hur visualiseringar av klimatförändringar är laddade med tecken och känslor Jägerskog, Mattias January 2010 (has links) <p>The purpose of this thesis was to examine the relationship between feelings and visualizations of climate change. A case study was done on visualizations of climate change from a web page concerning climate change published by the Swedish newspaper <em>Expressen </em>and from the American photographer Gary Braasch’s web page “World view of global warming”. The thesis is based on the article ”Emotional anchoring and objectification in the media reporting on climate change” by Birgitta Höijer. I have been aiming to understand the feelings of fear, hope, guilt, compassion and nostalgia through semiotic theories of icon, index and symbol.</p><p>Previous research has proven the difficulties in bringing the issue of climate change up on the public agenda – which is connected to the difficulties of visualizing climate change. The nature of climate change being slow and hard to spot on an individual level has been highlighted as a cause of both of these difficulties. Pictures and photos have in this thesis been seen as the “interface” between science and the public – and hence <em>decoders</em> of the science of climate change. Höijer’s article about feelings has been used to understand this process of decoding.</p><p>The results show that the analyzed material could be linked to and described by the semiotic theories of icon, index and symbol. The emotional anchoring found in the material and the semiotic application have been shown to work complementarily with each other, leading to a broader understanding of the material’s relationship to social cognitions. The results further demonstrated that context is essential in some of the analyzed visualizations of climate change. Generic pictures found in the material could have been regarded as icon, index or symbol of other messages – but is through its contexts anchored with feelings, and becomes visualizations of climate change. The analysis also suggests that if icons of nature could be connected with feelings – so could nature itself. The consequences are speculated to lead to objectification of nature and ecophobia. By objectifying nature and using generic pictures, the material’s relationship to the concepts of “truth” and “myth” is questioned.</p><p>In conclusion, understanding of the analyzed material is advantageously achieved through complementary use of Höijers emotional categories and the semiotic theories of icon, index and symbol.</p> climate change nature environment climate internet media Expressen Gary Braasch visualization images photographs emotions feelings fear hope guilt compassion nostalgia truth myth semiotics archetypes icons index symbol Höijer iconographic sign interpretant object decoding generic anchoring objectification ecophobia context klimatförändringar natur miljö klimat internet media Expressen Gary Braasch visualisering bilder foton känslor rädsla hopp skuld medlidande nostalgi sanning myt bildsemiotik semiotik urbilder ikon index symbol Höijer ikonologisk ikonografisk preikonografisk tecken interpretant objekt avkodning generiska förankring objektifiering ekofobi kontext Media and communication studies Medie- och kommunikationsvetenskap
17	Naturligt farligt : Hur visualiseringar av klimatförändringar är laddade med tecken och känslor Jägerskog, Mattias January 2010 (has links) The purpose of this thesis was to examine the relationship between feelings and visualizations of climate change. A case study was done on visualizations of climate change from a web page concerning climate change published by the Swedish newspaper Expressen and from the American photographer Gary Braasch’s web page “World view of global warming”. The thesis is based on the article ”Emotional anchoring and objectification in the media reporting on climate change” by Birgitta Höijer. I have been aiming to understand the feelings of fear, hope, guilt, compassion and nostalgia through semiotic theories of icon, index and symbol. Previous research has proven the difficulties in bringing the issue of climate change up on the public agenda – which is connected to the difficulties of visualizing climate change. The nature of climate change being slow and hard to spot on an individual level has been highlighted as a cause of both of these difficulties. Pictures and photos have in this thesis been seen as the “interface” between science and the public – and hence decoders of the science of climate change. Höijer’s article about feelings has been used to understand this process of decoding. The results show that the analyzed material could be linked to and described by the semiotic theories of icon, index and symbol. The emotional anchoring found in the material and the semiotic application have been shown to work complementarily with each other, leading to a broader understanding of the material’s relationship to social cognitions. The results further demonstrated that context is essential in some of the analyzed visualizations of climate change. Generic pictures found in the material could have been regarded as icon, index or symbol of other messages – but is through its contexts anchored with feelings, and becomes visualizations of climate change. The analysis also suggests that if icons of nature could be connected with feelings – so could nature itself. The consequences are speculated to lead to objectification of nature and ecophobia. By objectifying nature and using generic pictures, the material’s relationship to the concepts of “truth” and “myth” is questioned. In conclusion, understanding of the analyzed material is advantageously achieved through complementary use of Höijers emotional categories and the semiotic theories of icon, index and symbol. climate change nature environment climate internet media Expressen Gary Braasch visualization images photographs emotions feelings fear hope guilt compassion nostalgia truth myth semiotics archetypes icons index symbol Höijer iconographic sign interpretant object decoding generic anchoring objectification ecophobia context klimatförändringar natur miljö klimat internet media Expressen Gary Braasch visualisering bilder foton känslor rädsla hopp skuld medlidande nostalgi sanning myt bildsemiotik semiotik urbilder ikon index symbol Höijer ikonologisk ikonografisk preikonografisk tecken interpretant objekt avkodning generiska förankring objektifiering ekofobi kontext Media and communication studies Medie- och kommunikationsvetenskap

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