Sökning: "Phase Coherence"

Visar resultat 1 - 5 av 36 uppsatser innehållade orden Phase Coherence.

  1. 1. Laboratory starlight simulator for future space-based heterodyne interferometry

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :William Karlsson; [2023]
    Nyckelord :Angular resolution; Astronomy; Coherence length; Digital delay lines; Fiber optical circuit; Heterodyne interferometry; Interference; Laboratory starlight simulator; NIR light Near-Infrared ; Optical path differences; Space exploration; Starlight; Testbed environment;

    Sammanfattning : In astronomy, interferometry by ground-based telescopes offers the greatest angular resolution. However, the Earth´s atmosphere distorts the incident wavefront from a celestial object, leading to blurring and signal loss. It also restricts the transmission of specific wavelengths within the electromagnetic spectrum. LÄS MER

  3. 2. Generation of attosecond X-ray pulses in free-electron lasers using electron energy modulation and undulator tapering

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/FREIA

    Författare :Karl-Fredrik Boholm Kylesten; [2023]
    Nyckelord :attosecond; free-electron laser; XFEL; self-amplified spontaneous emission; SASE; tapering; energy modulation;

    Sammanfattning : Free-electron lasers (FELs) are among the world's most intense artificial artificial sources of coherent light and are tunable to various wavelengths, including the X-ray spectrum. X-ray FELs (XFELs) are extremely useful for diffraction experiments to study molecules, materials, and quantum systems. LÄS MER

  4. 3. Ludonarrative Space : En fallstudie av den Narrativa Paradoxen och spelarens upplevelse i spelet Outer Wilds

    Kandidat-uppsats, Linnéuniversitetet/Institutionen för medier och journalistik (MJ)

    Författare :Lisa Brun; Jesper Jildestad; [2023]
    Nyckelord :Ludonarrative; Narrative Paradox; Outer Wilds; Semiotics; Multimodality; Multimodal discourse analysis; Ludology; Narratology; Player experience;

    Sammanfattning : The inherent conflict between the predetermined nature of narrative and the freedom that interactivity allows for, has been a major point of discussion in the field of interactive storytelling for many years. The Narrative Paradox, which initially described this tension, is seemingly getting closer than ever to being solved, but a singular solution with a definite answer has not been determined. LÄS MER

  5. 4. EVOKED PHASE COHERENCE AS A BIOMARKER FOR ADAPTIVE NEUROMODULATION IN RAT MODEL OF PARKINSON'S DISEASE

    Master-uppsats, Umeå universitet/Institutionen för psykologi

    Författare :Love Zackrisson; [2023]
    Nyckelord :Adaptive; Closed Loop; Neuromodulation; Parkinson’s Disease; Rat model; 6-OHDA; ITC; Phase Coherence; Bayesian Model; Classifier; Spinal Cord Stimulation; Deep Brain Stimulation.; Adaptiv; Closed Loop; Neuromodulation; Parkinson’s Sjukdom; Råttmodell; 6-OHDA; ITC; Faskoherens; Bayesiansk Modell; Klassificerare; Ryggradsstimulering; Djup Hjärnstimulering.;

    Sammanfattning : Neuromodulation, such as spinal cord stimulation (SCS) and deep brain stimulation (DBS), has been shown to modulate pathophysiological brain activity and provide symptomatic therapy for several neurological disorders, including Parkinson’s Disease. The effectiveness of this therapy could likely be further improved by neuromodulation that is adaptive, delivering stimulation more selectively, by monitoring a biomarker in recorded brain signals, which indicates the presence of a pathological state. LÄS MER

  7. 5. Machine learning assisted decision support system for image analysis of OCT

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Elias Yacoub; [2022]
    Nyckelord :OCT; Optical Coherence Tomography; Sahlgrenska Hospital; Sahlgrenska University Hospital; VGG16; InceptionResNet50V2; ResNet50V2; Choroidal Neovascularization; CNV; Diabetic Macular Edema; DME; drusen; Elias Yacoub; Elias; Yacoub;

    Sammanfattning : Optical Coherence Tomography (OCT) has been around for more than 30 years and is still being continuously improved. The department of ophthalmology is a part of Sahlgrenska Hospital that heavily uses OCT for helping people with the treatment of eye diseases. LÄS MER