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Motor Controller Board for CubeSat Reaction Wheels
Get PDFReaction wheels are crucial for CubeSats, providing precise attitude control and stability in the environment of space, enabling successful mission execution. The ‘Reaction Wheels’ project in the Cal Poly CubeSat Lab is in need of a new motor controller board due to the current board’s malfunction and inefficiencies in terms of size, complexity, power usage, and cost. Previously, other students have completed work on the mechanical design of the system, but little work has been done for the electrical components. The goal of this project is to design and test a new motor controller board that is compact, lightweight, power efficient, integrated with the primary compute board, and is ready for use in space environments so that upcoming missions can easily integrate reaction wheels into their system. This document serves as the final design report for the Motor Controller Board for CubeSat Reaction Wheels in the Electrical Engineering Department. The project background, specifications, design, assembly, and testing is presented
Investigating the Relationship Between Single and Multiple Sersic Models of Active Galaxies Using GALFIT
Get PDFSupermassive Black Holes (SMBHs) can be found in the center of almost every galaxy, and in some cases, can form Active Galactic Nuclei (AGNs). AGNs are some of the brightest objects in our observable Universe and are distinguished from quiescent galaxies by accretion onto the central SMBH, which forms a disk where the luminosity is produced. Reverberation mapping (RM) of broad-line AGNs determines the mass of the SMBH by resolving the gravitational sphere of influence of the BH ``in time . In this study, GALFIT is used to fit 2D analytic functions to existing Hubble Space Telescope (HST) images for 23 RM AGNs. The goal is to extract morphological information of the host galaxies, such as spheroid luminosity and size, as well as disk and bar luminosity (if present). Ultimately, when combined with the SMBH mass determined from RM, all 23 RM AGNs will be placed on the BH mass - host-galaxy scaling relations to study dependencies on host galaxy morphology.
Out of 23 galaxies, eight are best fit by a PSF and Sersic component only. The other 15 are spiral galaxies and found to be best fit with additional components, where ten are modeled with PSF, bulge, and disk components, and the other five are modeled with an additional bar component. For the 15 spiral host galaxies, the best fit is compared to a single-sersic model to study the difference in derived parameters. The comparison confirms that a single-sersic component best matches the disk of a multi-sersic model, confirming the procedure taken to model spiral host galaxies.
In building up scaling relations, researchers often encounter high-redshift objects or low resolution data of host galaxies, where components such as a disk cannot be resolved. The frequent strategy for these objects is to fit them with a single-sersic model. By comparing the different modeling approaches, this thesis provides recipes to adjust derived values (such as magnitude, radius, and Sersic index), quantifying uncertainties due to single-sersic fits
Electric Micromobility Background Report
No full textFor the state of California, “the transportation sector remains the largest source of GHG emissions in 2020, accounting for 37 percent of California’s GHG inventory in 2020, a drop from 40 percent in 2019” (California Air Resources Board, 2022). Comparatively, in the City of SLO, the transportation sector accounted for 50% of greenhouse gas emissions (City of San Luis Obispo, 2009). Electric micro mobility options are zero-emission devices that are smaller, more affordable, and require less heavy duty charging. The Electric Micro Mobility Transportation Plan produced by the San Luis Obispo Climate Coalition (SLOCC) proposes electric micro mobility considerations to the City of San Luis Obispo. The U.S. Department of Transportation defines e-micro mobility as “any small, lowspeed, electric-powered transportation device”, with examples like e-bikes and e-scooters (2023). The plan shall draw connections between the City of SLO’s existing conditions, analyze different case studies where micro mobility infrastructure and safety considerations have been implemented, and propose implementation measures.These principles will be in accordance with the City of SLO’s Active Transportation Plan, Climate Action Plan, and SLO Climate Goals
