Real-Time Rfi Mitigation In Radio Astronomy, 2019 Washington University in St. Louis
Real-Time Rfi Mitigation In Radio Astronomy, Emily Ramey, Nick Joslyn, Richard Prestage, Michael Lam, Luke Hawkins, Tim Blattner, Mark Whitehead
Senior Honors Papers / Undergraduate Theses
As the use of wireless technology has increased around the world, Radio Frequency Interference (RFI) has become more and more of a problem for radio astronomers. Preventative measures exist to limit the presence of RFI, and programs exist to remove it from saved data, but the use of algorithms to detect and remove RFI as an observation is occurring is much less common. Such a method would be incredibly useful for observations in which the data must undergo several rounds of processing before being saved, as in pulsar timing studies. Strategies for real-time mitigation have been discussed and tested with ...
Cosmological Distance Measurements With Rotse Supernovae Iip And Observational Systematics On Desi Emission Line Galaxy Clustering, 2018 Southern Methodist University
Cosmological Distance Measurements With Rotse Supernovae Iip And Observational Systematics On Desi Emission Line Galaxy Clustering, Govinda Dhungana
Physics Theses and Dissertations
Both Supernovae (SNe) and Baryon Acoustic Oscillations (BAO) surveys emerged as complementary probes of the expansion history of the universe in the last few decades. SNe Ia cosmology has reached the systematic limits in the optical surveys. The most frequently occuring SNe Type IIP are emerging as equally rich distance probes for the next generation larger surveys. In this thesis, I highlight the astrophysical observables of these events in the context of ROTSE III SN survey and using the ROTSE SNe IIP sample, I present calibration in the framework of expanding photosphere method (EPM) to use them as cosmological distance ...
Primordial Black Hole Atoms, 2018 Rowan University
Primordial Black Hole Atoms, David Zwick, Tyler Hanover, Brian Nepper
Student Research Symposium Posters
Primordial black holes are thought to have been formed at the early stages of the universe in the presence of non-homogeneous density distributions of dark matter. We are working under the assumption that dark matter consists of elementary low mass particles, specifically, spin 1/2 fermions. We further assume that dark matter is electrically neutral, thus its main interaction is gravitational. We investigate dark matter spin 1/2 fermions in orbit around a black hole atom and consider mass ranges for which the quantum description is appropriate. Solutions to the Dirac equation are utilized to describe the radial mass distribution ...
The Prospect Of Human Spiritual Unity Through The Cosmic Story, 2018 Department of Religion and Philosophy, Dominican University of California
The Prospect Of Human Spiritual Unity Through The Cosmic Story, Philip Novak
Collected Faculty and Staff Scholarship
Thomas Berry and Brian Swimme have noted that, “we seem to be moving beyond any religious expression so far known to the human into a meta-religious age that seems to be a new comprehensive context for all religions.” That “new comprehensive context” is of course now known as Big History -- a.k.a. the Evolutionary Epic, Universe Story, or New Cosmic Story—the astonishing contemporary synthesis of modern sciences that tells a coherent story of the evolution of the universe from the Big Bang 13.7 billion years ago to the present.
Yet with the notable exception of the writings ...
Pathways To The Cosmos:The Alignment Of Megalithic Tombs In Ireland And Atlantic Europe, 2018 Dublin Institute of Technology
Pathways To The Cosmos:The Alignment Of Megalithic Tombs In Ireland And Atlantic Europe, Frank Prendergast, Gabriel Cooney
Gabriel Cooney and Frank Prendergast present the context of and outline the approach to this one-day conference organised by Archaeology Ireland on behalf of the National Monuments Service at the Department of Culture, Heritage and the Gaeltacht and the Office of Public Works to mark the European Year of Cultural Heritage 2018. The event will take place at Dublin Castle on 15 September 2018.
Observations Of Ion Density And Temperature Around The International Space Station During Two Geomagnetic Storms, 2018 University of New Hampshire, Durham
Observations Of Ion Density And Temperature Around The International Space Station During Two Geomagnetic Storms, Alex M. Wright
Honors Theses and Capstones
The International Space Station (ISS) is a low Earth orbit research facility and host to an international crew. Geomagnetic storms cause changes in the Earth’s magnetic field and affect the ion density and temperature in the ionosphere which could pose a hazard to ISS crew. This hazard is measured by the Floating Potential Measurement Unit (FPMU) which measures ion density, ion temperature, and the charge differential of the ISS relative to its surrounding environment. I analyzed data collected by Narrow Sweep Langmuir Probe for two storms in 2015. Ion density and temperature were affected by geomagnetic storms, but the ...
Effects Of Mass And Distance Uncertainties On Calculations Of Flux From Giant Molecular Clouds, 2018 Michigan Technological University
Effects Of Mass And Distance Uncertainties On Calculations Of Flux From Giant Molecular Clouds, Matt Coel
Dissertations, Master's Theses and Master's Reports
It is assumed that the distribution of the Milky Way cosmic rays, the cosmic ray ‘sea,’ is even throughout the Galaxy. This assumption can be tested by measuring gamma rays produced from cosmic ray interactions with Giant Molecular Clouds. The gamma ray flux depends on the mass and distance of a given molecular cloud as well as the cosmic ray flux in its vicinity. Thus a predicted gamma ray flux can be compared to actual flux data from a detector. Uncertainties from measuring the mass of and distance to the clouds are taken into account for this prediction. This report ...
A Microlensing Detection Algorithm For Wide-Field Surveys, 2018 Bard College
A Microlensing Detection Algorithm For Wide-Field Surveys, Daniel Godines Alcantara
Senior Projects Spring 2018
Gravitational microlensing is a rare event in which the light from a foreground star (source star) is amplified temporarily as it goes around the Einstein radius of another star (lens star). This only occurs when the two stars align with the line of sight of the observer. The significance of microlensing is that it allows for the detection of planets, as when a planet orbiting the lensing star aligns within the Einstein radius, it acts as an additional lens that further amplifies the light. This results in a gaussian-like light curve with an additional deviation on the curve. Unlike transit ...
The Outer Space Film As A Mythology For Human Destiny, 2018 Bard College
The Outer Space Film As A Mythology For Human Destiny, Alexander Samir Habiby
Senior Projects Spring 2018
The modern outer space film uniquely explores the future and destiny of humanity as shown in 2001: A Space Odyssey, Contact, and Interstellar through their themes and invocation of the sublime. It functions as a modern mythology for human destiny.
The Coincident Coherence Of Extreme Doppler Velocity Events With P-Mode Patches In The Solar Photosphere, 2018 University of Colorado, Boulder
The Coincident Coherence Of Extreme Doppler Velocity Events With P-Mode Patches In The Solar Photosphere, Rachel Mcclure
Undergraduate Honors Theses
Observations of the solar photosphere show many spatially compact Doppler velocity events with short life spans and extreme values. In the IMaX spectropolarimetric inversion data of the first flight of the SUNRISE balloon in 2009 these striking flashes in the intergranule lanes and complementary outstanding values in the centers of granules have line of sight Doppler velocity values in excess of 4σ from the mean. We conclude that values outside 4σ are a result from the superposition of the granulation flows and the p-modes.
To determine how granulation and p-modes contribute to these outstanding Doppler events, I separate the two ...
Energy From Active Galactic Nuclei And The Effects On Host Spiral Galaxies, 2017 University of Arkansas, Fayetteville
Energy From Active Galactic Nuclei And The Effects On Host Spiral Galaxies, Amanda Schilling
Theses and Dissertations
I have investigated the energy output of active galactic nuclei (AGN) in order to understand how these objects evolve and the impact they may have on host galaxies. First, I looked at a sample of 96 AGN at redshifts $z \sim 2, 3,$ and $4$ which have imaging and thus luminosity measurements in the $griz$ and $JHK$ observed wavebands. For these galaxies, I have co-epochal data across those bands which accounted for variability in AGN luminosity. I used the luminosity measurements in the five bands to construct spectral energy distributions (SED) in the emitted optical-UV bands for each AGN. I ...
Detection Of Survival And Proliferation Of Sulfate Reducers Under Simulated Martian Atmospheric And Soil Conditions, 2017 University of Arkansas, Fayetteville
Detection Of Survival And Proliferation Of Sulfate Reducers Under Simulated Martian Atmospheric And Soil Conditions, Sergio Mosquera Mora
Theses and Dissertations
Numerous studies have tried to determine the survivability and proliferation of microorganisms under simulated Martian conditions. Furthermore, most of them have been focused on the ability of these microbes to cope with high brines’ salt (NaCl) concentrations inherent of the Martian surface. However, there are not studies related to the ability of bacteria to survive on subsurface environments that have increasing concentrations of sulfate compounds. For this research, a group of microorganisms known as sulfate-reducing bacteria or simply sulfate reducers were chosen due to their ability to use sulfate compounds as terminal electron acceptors to produce metabolic energy, their tolerance ...
Knotty Inflation And The Dimensionality Of Spacetime, 2017 University of Edinburgh
Knotty Inflation And The Dimensionality Of Spacetime, Arjun Berera, Roman V. Buniy, Thomas W. Kephart, Heinrich Päs, João G. Rosa
Mathematics, Physics, and Computer Science Faculty Articles and Research
We suggest a structure for the vacuum comprised of a network of tightly knotted/linked flux tubes formed in a QCD-like cosmological phase transition and show that such a network can drive cosmological inflation. As the network can be topologically stable only in three space dimensions, this scenario provides a dynamical explanation for the existence of exactly three large spatial dimensions in our Universe.
Quantum Physics And Relativity In Lovecraft's Fiction, 2017 Ursinus College
Quantum Physics And Relativity In Lovecraft's Fiction, Garrison Mccammon
English Summer Fellows
The early twentieth century brought about some of the best and most influential horror or weird tales ever written in the English speaking world. The most impressive and most lauded author of the group composed of such figures as Algernon Blackwood, M. R. James, Arthur Machen, Clark A. Smith, and Robert E. Howard was H. P. Lovecraft. Posthumously declared the literary successor to Edgar Allan Poe, Lovecraft’s fiction and tales of terror have cast such a huge shadow that every significant author in weird writing since his passing has claimed him as a literary heir. Lovecraft’s works were ...
Investigating Brown Dwarf Atmospheres: Gravity, Dust Content, Cloud Structure And Metallicity, 2017 The University of Western Ontario
Investigating Brown Dwarf Atmospheres: Gravity, Dust Content, Cloud Structure And Metallicity, Kendra Kellogg
Electronic Thesis and Dissertation Repository
Brown dwarfs are the lowest mass products of star formation. Their low masses don't allow them to sustain, or sometimes even begin, the thermonuclear processes that provide stars with internal energy and the thermal pressure necessary to maintain hydrostatic equilibrium. Thus, their radii and effective temperatures decrease as they age, continually changing their spectral classification. However, it is now a well-known fact that the spectral appearance of ultra-cool dwarfs is governed by more than just temperature. Factors such as gravity, metallicity and cloud distribution play an important role in the structure and composition of ultra-cool dwarf atmospheres and ultimately ...
Characterizing Cool Brown Dwarfs And Low-Mass Companions With Low-Resolution Near-Infrared Spectra, 2017 The Graduate Center, City University of New York
Characterizing Cool Brown Dwarfs And Low-Mass Companions With Low-Resolution Near-Infrared Spectra, Paige Godfrey
All Dissertations, Theses, and Capstone Projects
Exoplanet direct detections are reaching the temperature regime of cool brown dwarfs, motivating further understanding of the coolest substellar atmospheres. These objects, T and Y dwarfs, are numerous and isolated in the field, thus making them easier to study in detail than objects in companion systems. Brown dwarf spectral types are derived from spectral morphology and generally appear to correspond with decreasing mass and effective temperature (Teff). However, spectral subclasses of the colder objects do not share this monotonic temperature correlation, indicating that secondary parameters (gravity, metallicity, dust) significantly influence spectral morphology. These secondary atmospheric parameters can provide insight ...
Gravitational Wave Behavior At A Vacuum-Matter Interface, 2017 University of Puget Sound
Gravitational Wave Behavior At A Vacuum-Matter Interface, Jake Litterer
Honors Program Theses
In classical electrodynamics, boundary conditions of the E and B fields are derived from Maxwell's equations, which are used to derive the Fresnel equations describing the behavior of a wave at an interface between media with given indices of refraction. Though electrodynamics and gravity are in some instances strikingly analogous, boundary conditions in general relativity are somewhat more opaque. We will see that while while continuity of the metric must be true in general, discontinuity of the extrinsic curvature of spacetime, while allowed by the Einstein field equations, results in a singularity in the energy-momentum tensor. This singularity is ...
Accuracy And Stability Of Integration Methods For Neutrino Transport In Core Collapse Supernovae, Kyle A. Gregory
University of Tennessee Honors Thesis Projects
No abstract provided.
Have We Found Our Neighbors? The Search For Habitable Planets Outside Our Solar System, 2017 Duquesne University
Have We Found Our Neighbors? The Search For Habitable Planets Outside Our Solar System, Madeline Galbraith
No abstract provided.
Detection And Characterization Of Extrasolar Planets Through Planet-Disk Dynamical Interactions, 2017 The University of Western Ontario
Detection And Characterization Of Extrasolar Planets Through Planet-Disk Dynamical Interactions, Maryam Tabeshian
Electronic Thesis and Dissertation Repository
Structures observed in circumstellar disks may be caused by gravitational interaction with planetary or stellar companions. These perturbed disks are often signposts of planet birth in exoplanetary systems, and offer insights into the properties of both the disk and the perturbing planets. Therefore, structures observed in these disks provide a powerful tool for detecting and studying extrasolar planetary systems. In this work, we examine the link between disk structures and nearby/embedded planets using numerical simulations of both hypothetical and observed disk systems.
We demonstrate that gaps can be opened in dynamically cold debris disks at the mean-motion resonances (MMRs ...