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Articles 1 - 16 of 16
Full-Text Articles in Physical Sciences and Mathematics
Investigation Of Tertiary Impact Cratering And Relation To Impact Physics Theory, Mikayla Huffman
Investigation Of Tertiary Impact Cratering And Relation To Impact Physics Theory, Mikayla Huffman
Undergraduate Honors Theses
Extraterrestrial impact crater formation is important in many subfields of planetary science, including geochronology, planetary formation, and dynamic fragmentation theory. Current dynamic fragmentation theory lacks scale dependence and relies heavily on terrestrial data. Exploring a range of impact and ejecta velocities as is produced by cratering events on the Moon may bridge the gap between heavily terrestrial-based theory and planetary data. The secondary craters of secondary craters deemed “tertiary craters,” have been theorized, but planetary images have not been of sufficient resolution to effectively search for them until recently. Tertiary craters are formed by relatively low-velocity fragments ejected by nearby …
Dark Matter In The Heavens And At Colliders: Models And Constraints, Reinard Primulando
Dark Matter In The Heavens And At Colliders: Models And Constraints, Reinard Primulando
Dissertations, Theses, and Masters Projects
In this dissertation, we investigate various aspects of dark matter detection and model building. Motivated by the cosmic ray positron excess observed by PAMELA, we construct models of decaying dark matter to explain the excess. Specifically we present an explicit, TeV-scale model of decaying dark matter in which the approximate stability of the dark matter candidate is a consequence of a global symmetry that is broken only by instanton-induced operators generated by a non-Abelian dark gauge group. Alternatively, the decaying operator can arise as a Planck suppressed correction in a model with an Abelian discrete symmetry and vector-like states at …
Searches For Exotic Matter, David Lee Morgan
Searches For Exotic Matter, David Lee Morgan
Dissertations, Theses, and Masters Projects
This research encompasses two quite distinct searches for exotic matter. The first half concerns exotic matter on the scale of elementary particles. In this chapter, I consider the production of gluinos, the supersymmetric partner of the gluon, in models where the gluino is very light. Cross sections are calculated for electroproduction and hadroproduction of gluinos and the results indicate that existing accelerators are capable of probing the region of gluino masses between 1.0 and 2.0GeV with lifetimes between 10{dollar}\sp{lcub}-10{rcub}{dollar} and 10{dollar}\sp{lcub}-6{rcub}{dollar} seconds. Such experiments could find a light gluino if it exists, or to close this unexplored mass-lifetime window. The …
Solar Infrared Relative Intensity Data From The Halogen Occultation Experiment, Philip Todd Spickler
Solar Infrared Relative Intensity Data From The Halogen Occultation Experiment, Philip Todd Spickler
Dissertations, Theses, and Masters Projects
Solar data from the Halogen Occultation Experiment (HALOE) were analyzed to determine the center-to-limb relative intensity and the vertical temperature profile for the quiet and active Sun over wavelengths from 2.4 to 10 {dollar}\mu{dollar}m. An algorithm that incorporated a nonlinear least squares procedure was developed that modeled the HALOE instrument during data acquisition. Data obtained from limb-to-limb scans along the solar equator on days of very low activity in May 1994 were analyzed to obtain coefficients of a function describing the relative intensity from center to limb. The relative intensities produced were precise to 0.1% (2{dollar}\sigma{dollar}) from the center to …
Painleve Singularity Analysis Applied To Charged Particle Dynamics During Reconnection, Jay Walter Larson
Painleve Singularity Analysis Applied To Charged Particle Dynamics During Reconnection, Jay Walter Larson
Dissertations, Theses, and Masters Projects
For a plasma in the collisionless regime, test-particle modelling can lend some insight into the macroscopic behavior of the plasma, e.g conductivity and heating. A common example for which this technique is used is a system with electric and magnetic fields given by B = {dollar}\delta y{dollar}cx x + xcx y + {dollar}\gamma{dollar}cx z and E = {dollar}\epsilon{dollar}cx z, where {dollar}\delta{dollar}, {dollar}\gamma{dollar}, and {dollar}\epsilon{dollar} are constant parameters. This model can be used to model plasma behavior near neutral lines, ({dollar}\gamma{dollar} = 0), as well as current sheets ({dollar}\gamma{dollar} = 0, {dollar}\delta{dollar} = 0). The integrability properties of the particle motion …
Salt Water Plasma Model Of The Venus Atmosphere, Eueng-Nan Yeh
Salt Water Plasma Model Of The Venus Atmosphere, Eueng-Nan Yeh
Dissertations, Theses, and Masters Projects
No abstract provided.
Scintillation In The Ionosphere, M. Patrick Mccormick
Scintillation In The Ionosphere, M. Patrick Mccormick
Dissertations, Theses, and Masters Projects
No abstract provided.
Solar Cycle Effects On Inner Belt Protons, Robert C. Blanchard
Solar Cycle Effects On Inner Belt Protons, Robert C. Blanchard
Dissertations, Theses, and Masters Projects
No abstract provided.
A Study Of Satellite Amplitude Scintillation And Its Correlation With Radio Star Scintillation, William Beeuwkes Shuler
A Study Of Satellite Amplitude Scintillation And Its Correlation With Radio Star Scintillation, William Beeuwkes Shuler
Dissertations, Theses, and Masters Projects
No abstract provided.
Wind-Tunnel Measurements Of The Aerodynamic Damping And Oscillatory Stability In Pitch Of A Sphere At Mach Numbers From 0.20 To 4.63, Robert Ashworth Kilgore
Wind-Tunnel Measurements Of The Aerodynamic Damping And Oscillatory Stability In Pitch Of A Sphere At Mach Numbers From 0.20 To 4.63, Robert Ashworth Kilgore
Dissertations, Theses, and Masters Projects
No abstract provided.
On The Problem Of Radio Signal Attenuation During Hypervelocity Reentry, David Joseph Romeo
On The Problem Of Radio Signal Attenuation During Hypervelocity Reentry, David Joseph Romeo
Dissertations, Theses, and Masters Projects
No abstract provided.
Diurnal And Seasonal Variations Of Satellite Scintillation, John David Martin
Diurnal And Seasonal Variations Of Satellite Scintillation, John David Martin
Dissertations, Theses, and Masters Projects
No abstract provided.
Rocket Observations Of The Earth's Limb, Thomas B. Mckee
Rocket Observations Of The Earth's Limb, Thomas B. Mckee
Dissertations, Theses, and Masters Projects
No abstract provided.
The Visibility Of An Object In A Space Environment, Dennis J. Martin
The Visibility Of An Object In A Space Environment, Dennis J. Martin
Dissertations, Theses, and Masters Projects
No abstract provided.
Considerations Of The Motion Of A Small Body In The Vicinity Of The Stable Liberation Points Of The Earth-Moon System, William H. Michael
Considerations Of The Motion Of A Small Body In The Vicinity Of The Stable Liberation Points Of The Earth-Moon System, William H. Michael
Dissertations, Theses, and Masters Projects
No abstract provided.
A Theory Of Space Probe Entry Near The Low-Meteoric Velocity Limit, Frederick Cyril Grant
A Theory Of Space Probe Entry Near The Low-Meteoric Velocity Limit, Frederick Cyril Grant
Dissertations, Theses, and Masters Projects
No abstract provided.