LOUIS University of Alabama in Huntsville
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Reduction of cognitive load in immersive virtual reality with multisensory cues
Get PDFThis study investigated the effects of multimodal interfaces and immersive virtual environments on cognitive load. Participants played a first-person target shooting game with either a virtual reality headset or on a monitor, using visual, auditory-visual, and a haptic-visual interfaces. Performance and self-reported data about cognitive load and spatial presence were collected for each interface. The study found that both immersive environments and multimodal interfaces reduced cognitive load. Additionally, an interaction was seen such that multimodal interfaces were more effective at reducing cognitive load in immersive environments. These findings indicate that the addition of more modalities into interfaces, especially in highly immersive environments, may be beneficial for decreasing cognitive load and increasing performance. Differences between types of multimodal interfaces emphasizes the need for future research into how different modalities contribute to cognitive load
Evaluating the effects of L-PBF printing parameters on the microstructure and mechanical properties of GRCop-42
Get PDFGRCop-42 is a dispersion strengthened copper alloy of interest due to its high thermal conductivity. Since it is fabricated as a powder, it is adaptable to powder based, metal additive manufacturing (AM) processing. The chromium-niobium additives phase separate from the copper matrix and form strengthening dispersoids during the gas atomization process used to produce the powder. This study looks at the effect of the powder based, laser powder bed fusion (L-PBF) AM processing parameters on the resulting microstructure and mechanical properties. Builds were obtained from five different vendors, deposited using their best practice, for metallurgical and mechanical property evaluation. By comparing the size, morphology, and distribution of the dispersoids with the resulting mechanical properties, the consistency of the process across multiple platforms can be evaluated. This information is critical for establishing standards for the material properties in metal AM parts of GRCop-42
A blockchain-based platform for open science: a framework for transparent and trustworthy scientific research
No full textOpen science promotes transparency in scientific processes, including open access, incentivization, provenance, open-source tools, metrics, and resource sharing. However, effective management of these processes remains a challenge. This research explores the application of blockchain technology to address key aspects of open science, offering a decentralized and secure platform for secure tracking and independent verification of scientific data across various domains. Additionally, it allows researchers to preregister information, track every step in the research lifecycle, accrue incentives based on downloads and citations, and verify dataset authenticity through blockchain, providing immutable proof of existence at specific time points. We also analyzed the relationship between downloads and citations and used it to define an incentive distribution strategy. The study shows the potential of blockchain in advancing open science objectives by ensuring secure, transparent, and verifiable scientific research workflows
Designing a Test to Study Multi-Propeller Aerodynamic Interactions
Get PDFhttps://louis.uah.edu/rceu-hcr/1447/thumbnail.jp
Spectropolarimetric properties of vortex retarders
Get PDFVortex retarders are unique optical elements that create a uniform electric field phase retardance, but the traditional fast axis varies azimuthally over the area of the optic. This affects the radial and azimuthal polarization components of the incoming beam. The vortex retarders discussed here generate TEM10 and TEM20 Laguerre-Gaussian beams. While several varieties of these TEM10 and TEM20 vortex retarders exist, designed to function at specific wavelengths–and a few studies have reported their use at those wavelengths–almost no data exists detailing their polarimetric properties outside those wavelengths. Using a Mueller matrix spectropolarimeter with dual-rotating retarders, the polarization properties of four commercially available zero-order half-wave vortex retarders have been measured across a broad wavelength range of 300-1100nm. This data contributes to a more complete description of the spectral properties of these popular retarders
Data fusion approach to assessing hurricane impacts on US Gulf Coast wetlands: case studies of Hurricanes Ida and Ian
Get PDFThis thesis employs data fusion techniques to analyze the damage to US Gulf Coast wetlands caused by Hurricanes Ida and Ian. The relationship between ecosystem damage and wave stress is evaluated using salt marsh classifications derived from PlanetScope imagery and atmospheric and ocean modeling (WRF, ADCIRC+SWAN). Short-term vegetation recovery following Hurricane Ian is assessed using HLS-derived NDVI data. A multi-decadal analysis of salt marsh vegetation off the Louisiana coast is conducted with statistical models incorporating MODIS NDVI and MERRA-2 climate variables. The analysis reveals the following key findings: 1) -38.7% and -93.25% of wetland area changed following the passage of Hurricanes Ida and Ian, respectively; 2) on average, Ian caused a ~14% reduction in wetland NDVI, which recovered within one year; 3) statistical modeling found a multi-decadal decreasing trend in salt marsh NDVI, after accounting for hurricane damage; and 4) wave stress modeling shows potential for predicting wetland damage
Development of tungsten rhenium hafnium carbide tooling for friction stir welding of nickel based superalloys
Get PDFDevelopment of advanced high strength and high temperature tool materials are required for solid-state friction stir welding (FSW) of nickel-based superalloys. FSW tooling must be able to survive at the temperatures experienced in the FSW weldment in conjunction with very high mechanical loading. Thus improving the durability of FSW tool materials is critical to producing acceptable welds and expanding FSW application areas. The refractory alloy Tungsten-Rhenium-Hafnium Carbide (W-25%Re-4%HfC) is able to operate at temperatures of over 1000 °C, while maintaining the ductility required for good. Building upon previous research that demonstrated the 4% Hafnium Carbide (HfC) additive’s ability to yield the most refined grain structure, as well as a previous study focused on developing affordable manufacturing methods, the W-25%Re-4%HfC tool was chosen as the tool material for this study. This research subsequently demonstrated over 2032 millimeters (mm) of successful FSW weld in Inconel 625, utilizing this tool
Mazda Toyota Manufacturing Laser Gauge Measurement Tools and Analysis
Get PDFhttps://louis.uah.edu/research-horizons/1350/thumbnail.jp
Hit the Brakes for Goodness\u27 Sake: Quality Assurance for Preventing Automotive Brake Assembly Failures
Get PDFhttps://louis.uah.edu/research-horizons/1351/thumbnail.jp