100039 research outputs found
Sort by
Hard Disk Drive Reaction Wheel System for CubeSat Architecture
Get PDFSmall satellites have become prevalent within the aerospace industry due to their ability to provide an inexpensive and easily accessible platform for technology demonstrations. Reaction wheels are typically selected for these missions’ attitude and rate control due to their small form factor. Their downside, however, is high cost, upwards of thousands of dollars, which does not align well with the low budget of many small satellites. To address this issue, alternative momentum-actuator technologies can be implemented that, similar to traditional reaction wheels, impart torques for actuation but require much less mass, volume, power, and money. This manuscript discusses the implementation and testing of one such low-cost alternative, a hard disk drive (HDD) reaction wheel system, on Sailing to the Stars, a 1U CubeSat testing various deployers for shape-memory alloy light sails onboard the International Space Station (ISS). To mimic a spin-stabilized spacecraft, Sailing to the Stars spins about its major axis at a rate of 4 rad/s. This is achieved through the implementation of a 2.5-inch HDD reaction wheel system and inertial measurement unit (IMU). Two types of controllers were implemented on the HDD: a closed loop controller and in case of hardware failure, an open loop controller. The closed loop controller uses gyroscopic feedback from the IMU to calculate a stabilization torque with a proportional control law. The gain is applied to the change in spin speed of the HDD directly proportional to the torque that the HDD imparts onto the deployer. This results in a PWM value for the HDD ranging from 1000 μs to 2000 μs and is sent to the HDD via an Electronic Speed Controller (ESC). In case of IMU failure, the system triggers open loop control commanding a fixed final PWM value calculated using conservation of angular momentum. The reaction wheel system hardware consists of the HDD, IMU, ESC, and Feather M0 microcontroller. The HDD’s electrical capabilities were initially characterized through current draw and voltage measurements at various PWM values. The engineering design unit was assembled and tested in a simulated environment consisting of fishing line stabilizing the deployer about its major axis and attached to a swivel hook to allow for free rotation about this axis. A secondary test bed was developed via an air bearing to simulate a zero-gravity environment with no motion constraints about any of the satellite’s axes. Testing was conducted to tune the proportional gain heuristically until desired rise time, settling time, and steady state error were achieved. These tests were augmented with disturbances including imitation of external torques resulting from astronauts holding and releasing the deployers. These tests showed promising results with successful rate control of the deployer using the HDD reaction wheel system. Sailing to the Stars will be launching to the ISS in 2025 at which point the HDD performance in a true zero-gravity environment can be assessed to demonstrate the viability of the HDD reaction wheel system for future small satellites
Multi-Sensory Graphic Design
Get PDFMulti-sensory design is a design approach that enhances user engagement by integrating multiple senses into the design experience. While traditional graphic design primarily relies on visual perception, emerging research highlights the profound influence of multi-sensory elements in shaping user interaction, emotional response, and information retention
Grapholinguistics in Graphic Design
Get PDFWriting systems function as more than linguistic tools; they serve as powerful cultural and aesthetic symbols that influence branding, fashion, and multimedia design. Through an examination of typographic symbolism, foreign scripts evoke themes of mystery, exoticism, brutalism, constructivism, and authoritarianism, shaping consumer perception and artistic narratives
Designing Healing Environments for Pediatric Oncology
Get PDFChildren undergoing cancer treatment often spend extended time in clinical environments that can feel cold, stressful, and isolating. This study explores how nature-based and sensory-focused design can serve as positive distractions to support pediatric patients\u27 emotional well-being during treatment. Features such as lighting, green spaces, soft color palettes, aesthetics of the environment, and interactive elements are examined for their ability to create more comforting, human-centered hospital environments. These environments not only benefit young patients and their families but also improve the overall well-being and performance of healthcare staff by reducing stress, increasing job satisfaction, and promoting a more supportive workplace culture
Investigating Antimicrobial Activity of an Unknown Isolate Against ESKAPE Pathogens
Get PDFESKAPE pathogens (e.g., S. aureus, P. aeruginosa) are responsible for many antibiotic-resistant infections. There is a growing need to discover new antimicrobial agents. This experiment investigates whether an unknown bacterial isolate exhibits antimicrobial activity. Our isolate previously showed antimicrobial activity against Staphylococcus epidermidis, suggesting it may have similar effects on Staphylococcus aureus
Bacterial Treatment Enhanced Root Growth in Acidic and Neutral Conditions, But Limited \u3ci\u3eArabidopsis thaliana\u3c/i\u3e Leaf Development
Get PDFSoil bacteria help plants tolerate pH stress, extreme pH (too acidic or basic) limits plant growth, including Arabidopsis thaliana. Some bacteria improve plant resilience, but their role in pH tolerance is unclear, we aim to bridge this knowledge gap further. Soil acidification from pollution threatens global food security. This study tests whether a bacterial isolate from acidic soil helps A. thaliana grow in different pH conditions, which can be used in agriculture
Wishes in the Digital Age: How Make-A-Wish Transforms Lives Through Social Media
Get PDFMake-A-Wish is an inspiring nonprofit organization whose mission is to create life changing experiences by granting wishes to children with critical illnesses. Along with countless donations and volunteers, Make-A-Wish uplifts families by spreading the word and promoting wishes throughout multiple social media platforms
Effects of UV Radiation on Algae Biofilms of Rotating Algae Biofilm Reactors
Get PDFGoal: Discover effects of UV-A and UV-B radiation on the biofilm production of algae using a Rotating Algae Biofilm Reactor (RABR)
Method: Expose 3 RABRs in triplicate to UV-A, UV-B, and PAR to identify differences in biomass, nutrient uptake and pH levels.
Results: RABR’s under UV-B light have the highest productivit
Effect of Geomagnetic Activity on Radio Propagation in the 14 and 18 Mhz Range
Get PDFThe purpose of this experiment was to discover if the magnitude of a geomagnetic event has a notable effect on the reliability of the reception of a radio transmission given the location of origin
Cultivating Connections: How @SigmaAlphaSorority Strengthens Sisterhood Through Social Media
Get PDFMy topic explores how Sigma Alpha uses social media to cultivate sisterhood and community across its chapter