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Browsing Physics by Title
Now showing items 114-133 of 291
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Improving the Accuracy and Application of Nanopore DNA Sequencing
DNA contains the code of life, forming the molecular basis for all of life's diversity. The past several decades have witnessed remarkable progress in our ability to read and understand life's code through DNA sequencing. ... -
Increasing Access and Capabilities of CubeSats for Investigation of Earth Trojan Asteroids
This thesis develops the requirements of a low-cost spacecraft mission to the Sun-Earth Lagrange point L4 and L5 to search for Earth Trojan asteroids, and develops and demonstrates a specialized communication system needed ... -
Information Content and Analysis of X-ray Absorption Spectroscopy and X-ray Emission Spectroscopy Using Machine Learning
Data science and machine learning (ML) methods are revolutionizing scientific analysis and data processing. As a case in point, ML applied to X-ray spectroscopies has recently exploded, showcasing its effectiveness in ... -
Interacting Quantum Gases of Lithium and Ytterbium
(2014-02-24)This dissertation describes the development of a scientic apparatus for trapping ultracold quantum gases of atomic lithium and ytterbium, and discusses the studies of interactions between such particles under a range of ... -
Interaction-driven dynamical delocalization in a kicked one-dimensional ultracold gas
This dissertation reports on the experimental observation of interaction-driven dynamical delocalization in a kicked one-dimensional ultracold gas. In the absence of interactions, particles in a one-dimensional disordered ... -
Interactions in the Ultracold Lithium Ytterbium 3P2 System
I detail the execution and results of experiments in a mixture of ultracold atomic gases using fermionic lithium (6Li) and bosonic ytterbium (174Yb) in the metastable 3P2 state. We demonstrate efficient transfer of ground ... -
Interlayer Valley Excitons in Two-Dimensional Semiconductor Heterostructures
The ability to isolate and manipulate two-dimensional crystals into carefully designed van der Waals heterostructures is an emerging technology that offers an unprecedented level of control over the optical and electronic ... -
Investigating and Improving Student Understanding of Key Ideas in Quantum Mechanics throughout Instruction
This dissertation describes research on student understanding of quantum mechanics across multiple levels of instruction. The primary focus has been to identify patterns in student reasoning related to key concepts in ... -
Investigating and Improving Student Understanding of Superposition in Introductory and Quantum Physics Courses
This dissertation presents results from research and curriculum development related to student understanding of the principle of superposition in introductory optics and upper-division quantum mechanics courses. The focus ... -
Investigation of Background from the Inter-Spectrometer Penning Trap and Secondary Electron Emission in the KATRIN Experiment
The KATRIN experiment aims to determine the neutrino mass with unprecedented precision by measuring the tritium $\beta$-decay spectrum with a tandem of MAC-E-filter spectrometers. The background rate measured at the ... -
An investigation of student understanding of basic concepts in special relativity
(2001)This dissertation reports on a systematic investigation of student understanding of the concepts of time and space in special relativity. During the investigation we have identified persistent difficulties with the definitions ... -
An Investigation of Student Understanding of Classical Ideas Related to Quantum Mechanics: Potential Energy Diagrams and Spatial Probability Density
This dissertation describes the results of two related investigations into introductory student understanding of ideas from classical physics that are key elements of quantum mechanics. One investigation probes the extent ... -
Investigation of student understanding of hydrostatics and thermal physics and of the underlying concepts from mechanics
(1999)This dissertation describes an investigation of student understanding of hydrostatics and thermal physics in first- and second-year university physics courses. We found that after standard instruction many students have ... -
Investigation of student understanding of the wave-like properties of light and matter
(1999)The research described in this dissertation is part of an ongoing investigation of student learning of the wave-like properties of light and matter. The investigation was conducted in the context of a broad range of physics ... -
Ion Photon Entanglement in a Parabolic Mirror Trap
Single trapped ion qubits are excellent candidates for quantum computation and information, and they also possess the ability to coherently couple to single photons. Efficient fluorescence collection is the most challenging ... -
Ion Photon Entanglement with Barium
Entanglement between a single trapped <super>138</super>Ba<super>+</super> and a single spontaneously emitted photon is demonstrated. The system is used to measure a CHSH Bell signal of 2.303(36), verifying the violation ... -
Karlsruhe Tritium Experiment: Detector System Commissioning and In-Situ PIN-Diode Array Dead-Layer Measurement
(2013-07-23)The <underline>Ka</underline>rlsruhe <underline>Tri</underline>tium <underline>N</underline>eutrino (KATRIN) experimental goal is to measure the neutrino mass to 0.2 eV sensitivity at the 90 percent confidence level. This ... -
Laboratory-based Tender X-ray Emission Spectroscopy: Instrumental, Experimental, and Theoretical Advances and Application to the Study of Phosphorus and Sulfur Electronic Structure
Tender x-ray emission spectroscopy (XES) is a powerful, element-specific, atomically local probe of chemical and electronic structure. Taking advantage of advances in every component of spectrometer systems including ... -
Large Momentum Separation Matter Wave Interferometry
This work establishes a new benchmark for momentum separation in a matter wave interferometer with stable, visible fringes. With a path separation of 112 photon recoil momenta, our signal visibility of 30% and phase stability ... -
Laser Cooling and Trapping of 6Li: Experimental Tools for Many-Body Fermionic Dynamics and Ring Trap
This thesis delves into the laser cooling and trapping of 6Li, a fermionic atom, with the aimof creating experimental tools for the exploration of many-body fermionic dynamics in quantum degeneracy, specifically within ...