Essays about: "Phase Coherence"

Showing result 1 - 5 of 24 essays containing the words Phase Coherence.

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

   University essay from Luleå tekniska universitet/Rymdteknik

   Author : William Karlsson; [2023]
   Keywords : 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;

   Abstract : 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. READ MORE

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

   University essay from Uppsala universitet/FREIA

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

   Abstract : 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. READ MORE

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

   University essay from Umeå universitet/Institutionen för psykologi

   Author : Love Zackrisson; [2023]
   Keywords : 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.;

   Abstract : 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. READ MORE

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

   University essay from Luleå tekniska universitet/Institutionen för system- och rymdteknik

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

   Abstract : 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. READ MORE

6. 5. Evaluation of non-stationary signal processing methods for binary EEG classification

   University essay from Lunds universitet/Matematisk statistik

   Author : Amanda Ledell; [2022]
   Keywords : Mathematics and Statistics;

   Abstract : Electroencephalogram (EEG) measurements are notoriously noisy and non-stationary and there are several specialized techniques for their analysis and interpretation. In this thesis, we implement a collection of stationary and non-stationary methods including coherence, Phase Locking Value (PLV), Phase Lag Index (PLI), and their imaginary counterparts. READ MORE