Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- 13CO2 (1)
- Aberration (1)
- Active matter (1)
- Aeronomy (1)
- Approximation method (1)
-
- Atmospheric cooling (1)
- Bethe lattice (1)
- Biophysics (1)
- CO2-O (1)
- Causality (1)
- Chaos (1)
- Chaotic mixing (1)
- Closed time-like curves (1)
- Earth (1)
- Fluid Mechanics (1)
- Inertial frame dragging (1)
- Ion optics (1)
- Ising model (1)
- Linked-cluster expansions (1)
- Mars (1)
- Nuclear physics (1)
- O (1)
- Optimization (1)
- Potts model (1)
- Rare-isotope (1)
- Spectrometer (1)
- Spectroscopy (1)
- Statistical mechanics (1)
- Swimming microbes (1)
- Time travel (1)
Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Particle Swarm Optimization For High Rigidity Spectrometer, Yicheng Wang
Particle Swarm Optimization For High Rigidity Spectrometer, Yicheng Wang
Honors Theses
The goal of this project is to find reliable parameter settings for a multi-dimensional global optimizer to optimize the performance of a large acceptance ion optical system for the requirements of nuclear physics experiments. We develop and test the Particle Swarm Optimization (PSO), a global optimization algorithm designed for continuous multi-dimensional problems, on a large acceptance particle beam separator, the High Rigidity Spectrometer (HRS) at the Facility for Rare Isotope Beams (FRIB), which is a laboratory specializing in the production and experimental study of short-lived nuclear matter. We split the HRS into two sections, the High-Transmission Beamline (HTBL) and the …
Long-Range And Chaotic Active Mixing Of Swimming Microbes In A Vortex Chain Flow, Nghia Le
Long-Range And Chaotic Active Mixing Of Swimming Microbes In A Vortex Chain Flow, Nghia Le
Honors Theses
We present experiments studying the motion and active mixing of swimming mi- crobes in laminar, vortex-dominated fluid flows. We are testing a theory that predicts the existence of swimming invariant manifolds (SwIMs) - invisible, one-way barriers blocking the paths of self-propelled tracers in the flow in one direction. We also pro- pose that the SwIMs together can form chute structures in three-dimensional phase space that facilitate cross-vortex transport of the microbes. We also observe evidence of how these structures promote long-range transport at different non-dimensional velocities (microbe’s velocity relative to flow velocity). Long-range transport is quan- tified by measuring the …
Linked-Cluster Expansions For Lattice Spin Models, Yuyi Wan
Linked-Cluster Expansions For Lattice Spin Models, Yuyi Wan
Honors Theses
Similar to various series expansions that are used to approximate mathematical func- tions, the linked-cluster expansion is an approximation method that allows us to approach the actual values of a very large physical system’s different physical quan- tities by systematically studying smaller systems embedded in this larger system. The main concept in linked-cluster expansion, weight, represents the additional con- tribution to a certain physical quantity by increasing the system size by one unit. These weights are used to eventually build up the result on a larger system. In our case, we focus on the partition function, a quantity that can …
Vibrational Spectroscopic Monitoring Of Co2-O Energy Transfer: Cooling Processes In Atmospheres Of Venus & Mars, Jakob Aaron Schaeffer
Vibrational Spectroscopic Monitoring Of Co2-O Energy Transfer: Cooling Processes In Atmospheres Of Venus & Mars, Jakob Aaron Schaeffer
Honors Theses
The vibrational excitation of CO2 by a fast-moving O atom followed by infrared emission from the vibrationally excited CO2 has been shown to be an important cooling mechanism in the upper atmospheresof Venus, Earth and Mars. We are trying to determine more precisely the efficiency (rate coefficient) of the CO2-O vibrational energy transfer. For experimental ease the reverse reaction is used, i.e. collision of a vibrationally excited CO2 with atomic O, where we are able to convert to the atmospherically relevant reaction via a known equilibrium constant. The goal of this experiment was to measure the magnitudes of rate coefficients …
Closed Time-Like Curves And Inertial Frame Dragging: How To Time Travel Via Spacetime Rotation, Conrad Wilson Moore
Closed Time-Like Curves And Inertial Frame Dragging: How To Time Travel Via Spacetime Rotation, Conrad Wilson Moore
Honors Theses
As the number of solutions to the Einstein equations with realistic matter sources that admit closed time-like curves (CTC's) has grown drastically, it has provoked some authors [10] to call for a physical interpretation of these seemingly exotic curves that could possibly allow for causality violations. A first step in drafting a physical interpretation would be to understand how CTC's are created because the recent work of [16] has suggested that, to follow a CTC, observers must counter-rotate with the rotating matter, contrary to the currently accepted explanation that it is due to inertial frame dragging that CTC's are created. …