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Articles 1 - 14 of 14
Full-Text Articles in Physics
Investigation Of An Unusual Thin Layer Descending Through The Upper Stratosphere, Houston D. Bentley
Investigation Of An Unusual Thin Layer Descending Through The Upper Stratosphere, Houston D. Bentley
Physics Capstone Projects
Lidar observations on the night of 19-20 February 2004 at Logan, Utah (41.74 N, 111.81 W) revealed a strange thin layer which descended from roughly 55 km to 30 km over seven hours. Approximations are made for the dimensions and descent rate of the layer. Although the particle radius and density are unknown, a range can be determined from the descent rate and reference to the sizes of known particles. Several possible sources for the layer are explored, concluding that an object entering the Earth’s atmosphere was the most probable cause.
Impact Of Bubble Baths On Stainless Steel Sphere Water Entry, Wesley Robinson
Impact Of Bubble Baths On Stainless Steel Sphere Water Entry, Wesley Robinson
Physics Capstone Projects
Soap Bubbles on the water surface would seem to be an intuitive means for splash suppression, but their presence appears to be a double edged sword. We present on the water entry of hydrophilic spheres where the liquid surface is augmented by the presence of a bubble layer, similar to a bubble bath. While the presence of a bubble layer can diminish splashing upon impact at low Weber numbers, it also induces cavity formation at speeds below the critical velocity. The formation of a cavity generally results in larger Worthington jets and thus, larger amounts of ejected liquid. Bubble layers …
Mathematica Program To Compute Klein Gordon Equation For Generic Black Holes, Brant Smith
Mathematica Program To Compute Klein Gordon Equation For Generic Black Holes, Brant Smith
Physics Capstone Projects
The goal of this project is to develop a program that will compute the Klein Gordon equation for generic Black Holes through the program Mathematica. This program will be available on Utah State websites for public usage. This project focuses on an understanding of General Relativity and more concretely on theoretical aspects of Black Holes. Developing the program begins with computing the Laplace equation in flat space to understand what it means to have empty space without a Black Hole. The Klein Gordon equation for a Schwarzschild Black Hole is then solved to show what happens once a static, non-rotating …
Electron Yield Comparisons Of Low And High-Density Polyethylene, Jordan Lee
Electron Yield Comparisons Of Low And High-Density Polyethylene, Jordan Lee
Physics Capstone Projects
With continued growth of the aerospace industry and further reliance on its communication infrastructure, a general idea of environmental stresses and material feedback is needed. Terrestrial-based labs attempt to recreate certain conditions seen in orbit and beyond, in order to gauge how materials and equipment will react. The Electron Emissions Test (EET) Chamber, an apparatus of USU's Material Physics Group, is used to test certain characteristics of materials in space-like environments. This experiment attempted to discern electron yield characteristics of two molecularly similar polymers: Low-Density Polyethylene (LDPE) and High-Density Polyethylene (HDPE).
Numerical Methods For Anisotropic Thermal Conduction, Brett Adair
Numerical Methods For Anisotropic Thermal Conduction, Brett Adair
Physics Capstone Projects
Understanding the transport of heat in magnetized plasmas is imperative to furthering efforts towards controlled thermonuclear fusion. This work analyzes various numerical algorithms that are useful in studying temperature equilibration due to anisotropic heat transport. The study includes two numerical approaches to the standard Braginskii closure, the more accurate using a mixed auxiliary scalar in the finite-element formulation. The physically correct kinetic closure for heat flow parallel to the magnetic field is also tested. These approaches were used to study the benchmark case for anisotropic thermal conduction presented in the original NIMROD [C.R. Sovinec et al. “Journal of Computational Physics” …
Phonon Dynamics Of Alkali Metals In The Hcp Lattice Structure, Jake Christensen
Phonon Dynamics Of Alkali Metals In The Hcp Lattice Structure, Jake Christensen
Physics Capstone Projects
An Embedded-Atom-Method model that is successful at describing the vibrational properties of alkali metals in the BCC crystal structure is applied to the HCP structure. Phonon dispersion curves, density of states, and Debye temperatures are calculalated for Li, Na, K, Rb, and Cs. Comparison of BCC, FCC and HCP Debye temperatures show that BCC is the preferred structure at higher temperatures, which agrees with experiment.
The Effects Of The Beta Transition On Dielectric Breakdown In Ldpe, Tyler Kippen
The Effects Of The Beta Transition On Dielectric Breakdown In Ldpe, Tyler Kippen
Physics Capstone Projects
The beta transition is a solid-state transition that occurs as part of the glass transition in amorphous polymers. The transition occurs at a temperature where above which the polymer is soft and rubbery and below the transition temperature the polymer is hard and brittle. The glass transition is thought to be caused by the increasingly coordinated movements of polymer chains as the temperature of the polymer increases. Once the temperature reaches the glass transition temperature, large scale motions of polymer chains occurs and there is a dramatic change in properties. In LDPE the glass transition occurs in the region between …
Sodium Lidar For Mesopause Temperature And Wind Studies, Xiaoqi Xi
Sodium Lidar For Mesopause Temperature And Wind Studies, Xiaoqi Xi
Physics Capstone Projects
In 1990 Dr. Chiao-Yao She developed a narrowband Na Temperature lidar in Colorado State University (CSU), it immediately became an important instrument to measure the temperature in mesopause region (80-105 km in altitude): the atmospheric layer between mesosphere and thermosphere [Krueger et al., 2015]. Led by Dr. Tao Yuan, this system was relocated to Utah State University (USU) in summer 2010 and has been continuing its exploration of upper atmosphere. This report will give a brief introduction to the theory and application of Sodium Lidar.
Characterization Of Programmable Arduino Sensors, Brett Mortenson
Characterization Of Programmable Arduino Sensors, Brett Mortenson
Physics Capstone Projects
Arduinos are increasing in usage and prevalence due to the ease in which they can be programmed. External sensors attached to the Arduinos are being used for various measurements, and many of them give raw data output such as voltage spikes or decibel readings. These readings were characterized so that one can interpret the readings relatively easily, and understand more completely, the environment which the sensors are in. The sensors utilized are as follows: photoresistor, vibrational, sound, temperature, pressure, and humidity.
Atmospheric Gravity Wave Events Over Antarctica, America Wrobel
Atmospheric Gravity Wave Events Over Antarctica, America Wrobel
Physics Capstone Projects
This study used infrared (IR) image data obtained from McMurdo Station, Antarctica to investigate the properties of atmospheric gravity waves as they propagate into the upper mesosphere over Antarctica. The data were obtained as part of the international Antarctic Gravity Wave Instrument Network (ANGWIN). ANGWIN utilizes image data from several sites around Antarctica to investigate continent-wide propagation. This paper covers a study that reduced and analyzed two years of data from one particular site: McMurdo Station. An all-sky IR camera placed at McMurdo Station, Antarctica (77°83’ S, 166°61’ E) took one picture every ten seconds for the months of April …
Calculating Redshift Via Astronomical Spectroscopy, Joshua Glatt
Calculating Redshift Via Astronomical Spectroscopy, Joshua Glatt
Physics Capstone Projects
The Doppler effect is a well-known physical phenomenon which results in a change of a wave’s frequency or wavelength due to the motion of its source. Celestial objects in space (stars, galaxies, etc.) also experience a Doppler effect on their emitted electromagnetic radiation called redshift. In this study, redshifts were observed in the spectrographic observations of various celestial objects. This was done using a high-resolution near ultra-violet spectrometer in conjunction with a 14-inch Celestron Schmidt-Cassegrain telescope. The spectrometer was used to measure the absorption spectrum of the bodies and then these absorption spectrums were compared against the Hydrogen emission spectrum. …
Gravity Waves Over Antarctica, Vanessa Chambers
Gravity Waves Over Antarctica, Vanessa Chambers
Physics Capstone Projects
As part of the international Antarctic Gravity Wave Instrument Network (ANGWIN) program, the Utah State University all sky IR imager has been operated at the British Antarctic Survey (BAS) Halley Station (75°36′ S, 26°12′ W) since 2012, obtaining valuable gravity wave information in the upper mesosphere and lower thermosphere region (~80 to 100 km). In this study, we have utilized a new 3D spectral analysis technique (Matsuda, et al., 2014) to quantify the horizontal phase velocity distributions of gravity waves over Antarctica. This new tool enables us to analyze extensive amounts of airglow imaging data in a relatively short time …
Solar Observatory: Shedding Light On The Surface Of The Sun, Zane F. Davis
Solar Observatory: Shedding Light On The Surface Of The Sun, Zane F. Davis
Physics Capstone Projects
The Solar Observatory was used to observe the photosphere of the sun. The main focus to observer the photosphere are the sunspots and prominences that develop on the surface. These phenomenon can lead to Coronal Mass Ejections (CME’s). After taking pictures and analyzing them, there was only one day that had any activity on the photosphere. It was concluded that the sun is at it’s solar minima. This means that there is little to zero activity on the suns photosphere. With this, and more data over an extended period of time, it is possible to calculate a solar cycle.
D-Region Vlf Monitoring System, Jonh Carlos Mojica Decena
D-Region Vlf Monitoring System, Jonh Carlos Mojica Decena
Physics Capstone Projects
The use of VLF signals to monitor the changes that occur in the ionosphere resulting from solar variability, has helped to understand how different ionospheric layers depend upon the Sun. These different ionospheric layer responses play a significant role in determining space weather impacts. Our system was created to be a permanent monitor to study the effects on the D-region of the ionosphere and explore any major impacts due to sun radiation exposure. The use of inexpensive equipment proved to be effective and the key point in the creation of this system.