Uthkarsh
Das
Sponsor: Stephen Robinson, Ph.D. Mechanical & Aerospace Engr Our poster discusses the Attitude Determination and Control System (ADCS) software architecture for REALOP, UC Davis' first, and completely undergraduate-led, CubeSat mission. Once launched into space, the CubeSat will rotate in an unpredictable manner, known as tumbling. ADCS is in charge of detumbling and pointing the Raspberry Pi camera on the satellite towards the Earth. While in orbit, Sun and magnetic field sensor data is used to determine the orientation of the satellite. Once the current orientation is determined, the ADCS software calculates how to best control the actuators, which are the hardware mechanisms used to point the satellite in the desired direction. These actuators include magnetorquers, which are used to reduce tumbling in the satellite, as well as reaction wheels and hard disk drives (HDDs), which are used to rotate the satellite about one axis to point toward the Earth. Combined with additional subsystems, ADCS will be used to demonstrate the feasibility of low-cost satellite control methods. Mathematical and Experimental Models of Steam-driven Fluid Oscillations in a Laboratory Geyser with a Bubble Trap
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Uthkarsh Das
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Geysers are eruptive geologic phenomena defined by episodic venting of water and steam. They serve as volcanic analogs, exhibiting some similar dynamics during both the eruption and recovery phases. Many geysers, including Yellowstone National Park's "Old Faithful', are thought to have laterally offset subsurface reservoirs, termed a bubble trap, in which steam can accumulate, giving rise to fluid oscillations that have been observed in the geyser conduit. Characterizing these oscillations place constraints on the subsurface geometry of geyser systems that are otherwise difficult or impossible to measure. Here, we extend previous work on bubble trap effects by including a thermodynamic treatment of steam in a mathematical model of geyser dynamics using Hamiltonian mechanics. We use steam tables to implement an equation of state for steam, and we use a relaxation model to consider the equilibrium vs. nonequilibrium response of the geyser system to perturbations. We compare the predictions from our mathematical model with observations from a laboratory geyser to gain insight into the behavior of fluids in geysers. We will scale the model to Old Faithful to compare the oscillation frequency prediction to observed measurements from the Geyser. Identification of Anaerobic Bacterial Species Able to Form Byproducts of Biohydrogenation on Unsaturated Fatty Acids Hannah De Groot
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UC Davis / Earth And Planetary Sciences / 2023
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Uthkarsh Das