Nanostructured Coating for Aluminum Alloys Used in Aerospace Applications
The authors would like to acknowledge the Estonian Ministry of Education and Research by granting the projects IUT2–24, TLTFY14054T, PSG448, PRG4, SLTFY16134T and by the EU through the European Regional Development Fund under project TK141 (2014-2020.4.01.15-00). The atomic oxygen testing was performed in the framework of the “Announcement of opportunity for atomic oxygen in the ESTEC Materials and Electrical Components Laboratory/ESA-TECQE-AO-013375),” through a collaboration with Picosun Oy. The authors also thank Dr. Elo Kibena-Põldsepp for the electrodeposition of Ag onto the anodized substrates.
Binocular function measures as predictors of user performance in stereoscopic augmented reality
Inconsistency between the binocular and focus cues in stereoscopic augmented reality overburdens the visual system leading to its stress. However, a high individual variability of tolerance for visual stress makes it difficult to predict and generalize the user gain associated with the implementation of alternative visualization technologies. In this study, we investigated the relationship between the binocular function and perceptual judgments in augmented reality. We assessed the task completion time and accuracy of perceptual distance matching depending on the consistency of binocular and focus cues in the stereoscopic environment of augmented reality. The head-mounted display was driven…
Sputtered SiOxNy thin films: improving optical efficiency of liquid crystal diffuser elements in multi-focal near-to-eye display architecture
In this work we present reactive sputtered SiOxNy films with a variable refractive index as a convienent solution for contrast improvement of liquid crystal diffuser multi stacks in near-to-eye AR/VR displays. The focus concerns minimization of light reflections between internal structures, in particular ITO, by optimizing internal layers through tailored properties of thin film coatings, as well as subsequent laser patterning of thin film stack. Inorganic thin films have been deposited on glass by physical vapor deposition. Corresponding refractive index, thickness, uniformity and dielectric characteristics and other electro-optical properties have been measured and their impact on the res…
Zn–ZnO nanokompozītu pārklājumu iegūšana un struktūras midificēšana atkvēlināšanas laikā
Darba mērķis bija ar mehanoaktivētās oksidēšanas metodi iegūto Zn-ZnO naokompozīto pārklājumu īpašību noskaidrošana atkarībā no atkvēlināšanas temperatūras. Darba gaitā tika novērots, ka iegūtie pārklājumi pēc atkvēlināšanas pārvēršas no tumšām ar metālisku spīdumu apveltītām Zn-ZnO kārtiņām par pilnībā caurspīdīgām ZnO kārtiņām. Iegūti dati par šo pārklājumu mikrostruktūru, nanostruktūru, optiskajām, elektriskajām un mehāniskajām īpašībām. Rezultāti rāda, ka atkarībā no atkvēlināšanas temperatūras mainās pārklājumu struktūra, kas būtiski ietekmē visas iepriekšminētās īpašības. Optimālās atkvēlināšanas temperatūras 873-923K rezultātā palielinās pārklājumu elektropretestība (no ~10-2 līdz 10…
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Elektroniskā versija nesatur pielikumus
When virtual and real worlds coexist: Visualization and visual system affect spatial performance in augmented reality
New visualization approaches are being actively developed aiming to mitigate the effect of vergence-accommodation conflict in stereoscopic augmented reality; however, high interindividual variability in spatial performance makes it difficult to predict user gain. To address this issue, we investigated the effects of consistent and inconsistent binocular and focus cues on perceptual matching in the stereoscopic environment of augmented reality using a head-mounted display that was driven in multifocal and single focal plane modes. Participants matched the distance of a real object with images projected at three viewing distances, concordant with the display focal planes when driven in the mu…
Comparative assessment of brain activity during depth perception of stereoscopic and volumetric images
Recent advancements in visualization systems have triggered a growing demand for the objective and accurate comparison of user cognitive requirements when perceiving three-dimensional images demonstrated in different ways. In this work, we present the first comparative assessment of brain activity in subjects viewing stereoscopic images and volumetric images. Electroencephalography was employed to assess the short-term changes in event related potentials and neural oscillations which were further interpreted in terms of cognitive requirements for relative depth judgments. As a result, considerably higher activity have been registered in the beta band and gamma band in case of judging relati…