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Full-Text Articles in Physics
Encoding A 1-D Heisenberg Spin 1/2 Chain In A Simulated Annealing Algorithm For Machine Learning, Daniel Pompa
Encoding A 1-D Heisenberg Spin 1/2 Chain In A Simulated Annealing Algorithm For Machine Learning, Daniel Pompa
Honors Theses
The application areas of machine learning techniques are becoming broader and increasingly ubiquitous in the natural sciences and engineering. One such field of interest within the physics community is the training and implementation of neural networks to aid in quantum many-body computations. Conversely, research exploring the possible computational benefits of using quantum many-body dynamics in the area of artificial intelligence and machine learning has also recently started to gain traction. The marriage of these fields comes naturally with the complementary nature of their mathematical frameworks. The objective of this study was to explore the possibility of encoding a quantum spin …
Radiative Double Electron Capture By Ions In Collisions With Gas Targets, Charles Taylor
Radiative Double Electron Capture By Ions In Collisions With Gas Targets, Charles Taylor
Honors Theses
Radiative double electron capture (RDEC) is a two-step quantum process where two electrons are captured from the target gas to the projectile ion beam with a simultaneous emission of a single photon. The projectile ion beam was obtained from the tandem Van de Graaff accelerator at Western Michigan University. The projectile beam used is fully and partially ionized fluorine 9+, and 8+ in collision with highly pure nitrogen gas. The objective of the research is to observe RDEC from x ray detection using time to amplitude converters (TACs) that look for coincidences between x rays and particles. The signal from …
Exploring New Fe-Substituted Rare-Earth-Based High Entropy Alloys, Glendon Rewerts
Exploring New Fe-Substituted Rare-Earth-Based High Entropy Alloys, Glendon Rewerts
Honors Theses
No abstract provided.
Shape Memory Alloy Applications, Dillon Wester
Shape Memory Alloy Applications, Dillon Wester
Honors Theses
Shape memory alloys (SMAs) are unique mixtures of metals that have qualities unlike any other substance. Most notably is their ability to "remember" a shape and revert back to that shape with the application of heat. One such alloy is the Ni-Ti alloy, Nitinol. SMAs also have many other favorable characteristics such as superelasticity, biocompatibility and much more. Superelasticity is the ability to bend under stress and then return to its original shape with the removal of the stressor. Biocompatibility means that the SMAs are not toxic to living organisms, whether they are only used periodically or left in permanently. …
Measurements Of The Primary Bjerknes Force In A Cavitating Ultrasonic Field, Mason Smith
Measurements Of The Primary Bjerknes Force In A Cavitating Ultrasonic Field, Mason Smith
Honors Theses
Cavitation is the result when there are rapid changes in pressure in a liquid. These vapor-filled cavities can occur when ultrasound propagates through water at sufficient power. The volumes of these cavities can pulsate and can even couple with the radiation pressure from the ultrasound. The result is a translational force on the bubbles. This translational force on the bubble is called the primary Bjerknes force. The secondary Bjerknes force is the result of two pulsating cavities, but this force is ignored since the buoyant force and the primary Bjerknes force are the dominant forces. Immediately before a bubble begins …
Passive Solar Tracking Using Shape Memory Alloys, Keeley G. Johnson
Passive Solar Tracking Using Shape Memory Alloys, Keeley G. Johnson
Honors Theses
The world's energy demands are growing daily in conjunction with the global population and urbanization. In the modern era, the main source of energy has come from nonrenewable fossil fuels. While this source is one of the cheapest forms of energy, it is also one of the worst for the environment and will only last until the earth runs out of these fossil fuels. Solar energy, on the other hand, is both much better for the environment and an inexhaustible resource. The primary issue that arises with the accessibility of solar energy is that it is much more expensive per …
Expansion Of An Ultracold Neutral Plasma, Yin Li
Expansion Of An Ultracold Neutral Plasma, Yin Li
Honors Theses
Ultracold neutral plasmas (UNP) exhibit interesting behavior and are more feasible to control than hot plasmas. Physicists would like to lower the temperature of a UNP to achieve a higher Coulomb coupling parameter, Γ for both electrons and ions. However, the three body recombination (TBR) between ions and electrons produces Rydberg atoms and heats up the plasma electrons, thereby ionizing them to Γe < 0.2. Adding Rydberg atoms to the plasma will reduce the temperature of a UNP in certain situations. In this honors project, we tried to achieve a Γe value greater than 0.5 by embedding Rydberg atoms multiple times in the plasma. We did extensive numerical simulations, but we were unable to replicate previous results from another group which obtained Γe = 0.5 in the first 1 µ s of plasma evolution. However, we were able to use the simulation results to test various different experiment scenarios. For experiments, we created a UNP of Rubidium atoms in the magneto-optical trap by laser cooling and photoionization. We figured out a nice way to zero the electric field within the field meshes by looking at the plasma expansion very late in its evolution through the micro-channel plate. We set the voltage and delay on the field mesh bias to find expansion velocity of the plasma for time t > 50 µs, and we used different methods to deduce the expansion velocity from the ion time of flight signals. However, we found that there was no relation of Γe at 1 µ s and the expansion velocity …
Using 3-Dimensional Ffts To Simulate Cmb Maps On A Spherical Cap, Eric Goetz
Using 3-Dimensional Ffts To Simulate Cmb Maps On A Spherical Cap, Eric Goetz
Honors Theses
The current methods of simulating the Cosmic Microwave Background (CMB) involve either simulating the entire sky using spherical transforms or simulating a at patch with fast Fourier transforms (FFTs). For patches that are too large to be considered at but much less than the full sky, the former method is inecient and the latter is inaccurate. One alternative method of CMB simulation is to simulate the random processes behind the CMB in a 3-dimensional box that contains the part of the sphere that we want to measure. Then, we can select the points we want from the box. This method …
Waveband Luminosity Correlations In Flux-Limited Multiwavelength Data And The Schwinger Effect In Minkowski & De Sitter Space-Times, Syed Jibran Haider
Waveband Luminosity Correlations In Flux-Limited Multiwavelength Data And The Schwinger Effect In Minkowski & De Sitter Space-Times, Syed Jibran Haider
Honors Theses
The first part of the thesis explores key findings determined from plotting multiple waveband luminosity and redshift correlations in quasar data binned in redshift. The second part of the thesis concerns itself with applying Picard-Lefschetz theory to pair particle production in de Sitter space-time (with or without a constant electric field).
Polychromatic Map-Making With Asymmetric Antenna Patterns, Connor Mooney
Polychromatic Map-Making With Asymmetric Antenna Patterns, Connor Mooney
Honors Theses
Imaging telescopes with asymmetric antenna patterns that vary with wavelength can create time-ordered data that may be processed into multiple images corresponding to different bands of wavelengths from just a single set of scans. The imaging telescope named QUBIC has this property and is the inspiration behind this project. Our goal is to quantify, both statistically and analytically, the ability of these telescopes to perform such a reconstruction given different cases. In the case that the telescope is observing the full sky, we reconstruct our maps via a spherical harmonic basis. In this way, the reconstructed images are described as …