When carbon dioxide emissions are high within a room, short and long-term health effects on humans have been observed. Natural gas stoves are common household appliances that contribute to carbon dioxide emissions. The purpose of this study is to model how the burners of a natural gas stovetop may impact the air quality and potential health risks within households. I measured carbon dioxide emissions from a Samsung gas range with one to four burners on maximum heat in thirty-minute intervals using an Aranet4 Home sensor. The results were observed to have an overall increase in carbon dioxide emissions correlating to the number of burners being used concurrently. Carbon dioxide concentrations reached harmful levels within thirty minutes when two or more burners were used. Knowing how the rates of carbon dioxide concentrations within a room may increase in correlation to use of one, or multiple, burners would provide users of gas ranges with a reference point on how the air quality may change over time. This would allow for a better understanding of the risks associated with natural gas stovetop usage regarding the health impacts of close exposure to high carbon dioxide concentrations. Future analysis can be conducted on the different rates of carbon dioxide emissions for functions of natural gas ovens.

Electromagnetic launchers currently use a combination of magnetic forces and complex electronic timing to propel objects. One example is the US Navy EMALS system, which uses a linear electromagnetic launcher to launch aircrafts from aircraft carriers. However, using complex electronic timing introduces more failure points within the system, increasing its complexity, making such systems susceptible to being disabled by external electromagnetic interference. Inspired by the design of Tom Stanton, this project explores a new approach that removes the digital-based electronic timing and replaces it with a mechanical timing system that can be used to propel drones or other payloads into the air quickly and efficiently. The goal of reducing the design’s complexity is to create a launcher that is a reliable method for drone and payload deployment. By removing electronic switching and using a mechanically driven circuit closure, this project develops a durable, efficient launch system. The prototype is built using 3D-printed components, powerful magnets, and a coil on a sled with contact arms that touch the conductive rail to complete the circuit. Rather than lining the rail with multiple coils, stationary magnets replace the coils with alternating currents to provide the acceleration when the coil becomes powered. The results allow us to have a competitive design that provides a practical alternative to the typical electromagnetic launchers. Expected results include improved durability, reliable performance due to the simplification of electronics, and reduced energy losses. Our research provides a new way to launch drones or other payloads to be integrated into systems where they would be less susceptible to external electromagnetic interference and jamming.

Humpback whales exhibit exceptional maneuverability in water, a trait attributed to the unique scalloped structures (tubercles) on the leading edges of their flippers. This study investigates the influence of such varied tubercles on the aerodynamic performance of wings, using both wind tunnel testing and computational methods. CAD models of the rigid wings were designed for 3D printing. These addressed three variations of the fin morphology, a smoothed base model, one with leading-edge tubercles, and one with tubercles on the trailing edge as well. The fin models feature a swept wing configuration with a concave region before the wing tip, both properties of humpback whale fins. The result of wind tunnel tests at constant, turbulent, wind speeds (Re=10^5) produced plots of the lift and drag coefficients for a varying angle of attack. The experimental results showed that leading-edge tubercles increase the maximum lift and increase the maximum angle of attack before stall occurs at the cost of some additional drag. The addition of trailing-edge scallops reduced drag and raised the overall efficiency to just below the baseline. Computational fluid dynamics (CFD) simulations comparable to the wind tunnel environment and in more turbulent aquatic conditions (Re>10^6) reveal the fluid flow. The tubercles and concave region influence the fluid, reducing span wise flow and the buildup of large tip vortices. The effect of tubercles has already been employed for its influence on stall angle, notably on the rudders of some racing yachts. The studied effect's ability to manage vortices across the wing span may have applications in particle separation, though significant work would need to be done to streamline the necessary manufacturing processes.

Noise pollution from 10 Hz to 200 kHz disrupts marine life and importantly damages cetaceans’ ability to navigate surroundings, communicate, and hunt. Possession Sound supports gray, humpback, and orca whales who all pass through its congested waterways and underwater soundscape. During 2023-2024 a voluntary slow down of commercial vessels occurred in Puget Sound. The results from Quiet Sound showed that 71% of 795 commercial vessels slowed down through the marked zones. There was a 50% 3 dB decrease in sound created and resulted in 72 additional minutes when underwater noise did not reach over 110 dB. One location where noise pollution is prominent is between the city of Mukilteo and the town of Clinton on Whidbey Island. The Mukilteo-Clinton ferries run 21 and a half hours a day, leading them to be a regular contributor to the underwater soundscape and an important factor to assess our environment's health. This study was conducted using data from a SoundTrap 400 hydrophone mounted .4 miles from the Mukilteo ferry terminal. 168 hours of constant data have been gathered between 2021 and 2024. From 1:30 am to 4:40 am, ferries don't run. Noise levels when the ferries don't run were compared to when they do run, which proved to show a significant reduction in overall RMS amplitude. Graphs plotting constant 24-hour RMS amplitude show spikes every half hour, which lines up with the Washington State Ferries (WSF) departure schedule. Future research must identify specific sound frequency signatures for the ferries and compare those frequencies and amplitudes to known values that may harm cetaceans and other marine life.

Magnetic field models of the Earth used for scientific applications and navigation systems are often mapped using ground and satellite measurements, but are rarely done at high altitudes in the atmosphere. Including magnetic field measurements from the upper troposphere and stratosphere could better inform these models. For this study, we used a MLX90393 magnetic field sensor to measure the magnetic field during a high altitude balloon flight. The sensor has a range of -20°C to 85°C, but temperatures often reach -50°C in the upper troposphere and lower stratosphere. In an attempt to keep the sensor within its operating range, we built an insulated enclosure of Styrofoam and mylar. The enclosure was sealed with weather resistant silicone and chemical hand warmers were placed inside. To improve the accuracy of magnetic field measurements on future balloon flights, we compared magnetic field measurements from a non-insulated and an insulated sensor during a high altitude balloon flight. In addition to magnetic field measurements, temperature and pressure measurements were taken inside and outside of the enclosure using a BMP-180 sensor.

Given the pressing challenges of climate change caused by human interference in natural systems, the civil engineering industry must adopt more sustainable solutions. One approach is the use of supplementary cementitious materials (SCMs), as cement production is a major source of CO₂ emissions. This ongoing study investigates the use of zeolite as an SCM in pervious concrete. During the summer of 2024, over a dozen pervious concrete specimens were cast with 0%, 25%, and 50% zeolite powder replacing traditional Portland cement. Zeolite, a naturally occurring mineral formed from volcanic eruptions millions of years ago, has been shown to adsorb pollutants and, when used as an SCM, can reduce CO₂ emissions from cement production and potentially increase the material's levels of strength. To assess the impact of zeolite on the mechanical and hydraulic properties of pervious concrete, tests on compressive strength, porosity, and permeability shall be conducted during the Winter 2025 and early Spring 2025 quarters. Results will be shared as laboratory tests are conducted and data is analyzed. The filtration capacity of pervious concrete for different types of pollutants, both with and without zeolite, is a key focus for future phases of this research project.

Although much has been explored regarding introductory physics students' everyday ideas about energy, it is often still taught in much the same way as it was 30 years ago (e.g., balls falling off cliffs, roller coasters, skateboarding). During that same time period, the climate crisis and society’s energy consumption has become a culturally important topic that is largely neglected in physics courses. At a community college in the Pacific NW, instructors introduced activities from Levy et al. (2023)  “An Energy Unit Fueled by Climate Change” to the physics curriculum, aiming to explicitly tie energy topics to climate change issues. Post implementation of the unit, we asked students to share their views of the relevance of and relationship between energy topics in physics and their society, specifically in the context of climate change. Using a phenomenographic qualitative analysis, we examined students' written reflections and coded their responses into similar themes. In this presentation, we share the results of our analysis and recommend a more robust integration of the culturally relevant topic of climate change into introductory physics education.