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- Bubble departure; Bubble explosion; Drag forces; Microgravity; Nucleate boiling; Thin-wire (1)
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Articles 1 - 30 of 38
Full-Text Articles in Physics
A New Mass Spectrometer For Upper Atmospheric Measurements In The Auroral Region, Addison E. Everett, James S. Dyer, Mike Watson, Wayne Sanderson, Scott Schicker, Dalon Work, Christopher J. Mertens, Scott M. Bailey, Erik A. Syrstad
A New Mass Spectrometer For Upper Atmospheric Measurements In The Auroral Region, Addison E. Everett, James S. Dyer, Mike Watson, Wayne Sanderson, Scott Schicker, Dalon Work, Christopher J. Mertens, Scott M. Bailey, Erik A. Syrstad
Graduate Student Posters
We have previously presented a new rocket-borne time-of-flight mass spectrometer (TOF-MS) for measurements in the mesosphere / lower thermosphere (MLT). Traditionally, mass spectrometry in the MLT has been difficult, mainly due to the elevated ambient pressures of the MLT and high speeds of a sounding rocket flight, which affect the direct sampling of the ambient atmosphere and spatial resolution. The TOF-MS is a versatile, inherently adaptable, axial-sampling instrument, capable of operating in a traditional TOF mode or in a multiplexing Hadamard-transform mode where high spatial resolution is desired. To minimize bow shock effects at low altitudes (~70-110km), the ram surface …
Temperature Dependence Of Sio2 Electron-Induced Luminescence, Amberly Evans Jensen, Gregory Wilson, Jr Dennison
Temperature Dependence Of Sio2 Electron-Induced Luminescence, Amberly Evans Jensen, Gregory Wilson, Jr Dennison
Presentations
No abstract provided.
Exploring The Universe… One Electron At A Time, Jr Dennison
Exploring The Universe… One Electron At A Time, Jr Dennison
Presentations
No abstract provided.
Electron Energy Dependent Charging Effects Of Multilayered Dielectric Materials, Gregory Wilson, Amberly Evans Jensen, Jr Dennison
Electron Energy Dependent Charging Effects Of Multilayered Dielectric Materials, Gregory Wilson, Amberly Evans Jensen, Jr Dennison
Presentations
No abstract provided.
Fabrication And Performance Of A Microfluidic Traveling-Wave Electrophoresis System, K. D. Jo, J. E. Schiffbauer, Boyd F. Edwards, R. L. Carroll, A. T. Timperman
Fabrication And Performance Of A Microfluidic Traveling-Wave Electrophoresis System, K. D. Jo, J. E. Schiffbauer, Boyd F. Edwards, R. L. Carroll, A. T. Timperman
All Physics Faculty Publications
A microfluidic traveling-wave electrophoresis (TWE) system is reported that uses a locally defined traveling electric field wave within a microfluidic channel to achieve band transport and separation. Low voltages, over a range of −0.5 to +0.5 V, are used to avoid electrolysis and other detrimental redox reactions while the short distance between electrodes, 25 μm, provides high electric fields of 200 V cm−1. It is expected that the low voltage requirements will simplify the future development of smaller portable devices. The TWE device uses four interdigitated electrode arrays: one interdigitated electrode array pair is on the top of …
Temperature Dependence Of Sio2 Electron-Induced Luminescence, Amberly Evans Jensen, Gregory Wilson, Jr Dennison
Temperature Dependence Of Sio2 Electron-Induced Luminescence, Amberly Evans Jensen, Gregory Wilson, Jr Dennison
Presentations
No abstract provided.
Electron Energy Dependent Charging Effects Of Multilayered Dielectric Materials, Gregory Wilson, Amberly Evans Jensen, Jr Dennison
Electron Energy Dependent Charging Effects Of Multilayered Dielectric Materials, Gregory Wilson, Amberly Evans Jensen, Jr Dennison
Presentations
No abstract provided.
Temperature Dependence Of Sio2 Electron-Induced Cathodoluminescence, Amberly Evans, Gregory Wilson, John R. Dennison
Temperature Dependence Of Sio2 Electron-Induced Cathodoluminescence, Amberly Evans, Gregory Wilson, John R. Dennison
All Physics Faculty Presentations
No abstract provided.
Classical Fano Oscillator, D. Mark Riffe
Classical Fano Oscillator, D. Mark Riffe
All Physics Faculty Publications
Starting from the quantum-mechanical Fano-Anderson Hamiltonian, we derive classical equations of motion for coordinates associated with the discrete and continuum states. The frequency-dependent absorption spectrum associated with this classical system exhibits the same Fano line shape as the quantum-mechanical system when appropriate correspondences between classical and quantum variables are made. In the time domain, the response of this classical Fano oscillator depends upon the asymmetry parameter q that appears in the expression for the Fano line shape. In particular, under the influence of impulsive driving of the system, the discrete oscillator's phase changes by ±π/2 as q increases from zero …
Mesospheric Temperature Variability And Seasonal Characteristics Over The Andes, Jonathan Pugmire, Yucheng Zhao, Michael J. Taylor, P D. Pautet
Mesospheric Temperature Variability And Seasonal Characteristics Over The Andes, Jonathan Pugmire, Yucheng Zhao, Michael J. Taylor, P D. Pautet
Graduate Student Posters
The Utah State University CEDAR Mesospheric Temperature Mapper (MTM) is a high-quality CCD imager capable of remote sensing faint optical emissions from the night sky to determine mesospheric temperature and its variability at an altitude of ~87 km. The MTM was operated at the new Andes Lidar Observatory (ALO)located at Cerro Pachon, Chile (30.2° S, 70.7° W) since August 2009 to investigate the seasonal characteristic of the mesopause at mid-latitudes. Measurement were made alongside a powerful lidar capable of height sounding the mesosphere. In this study, the MTM data have been analyzed to determine night to night variability and seasonal …
The World's Most Sensitive Rayleigh-Scatter Lidar, Leda Sox, V. B. Wickwar, J P. Herron, Marcus J. Bingham, Lance W. Peterson
The World's Most Sensitive Rayleigh-Scatter Lidar, Leda Sox, V. B. Wickwar, J P. Herron, Marcus J. Bingham, Lance W. Peterson
Posters
No abstract provided.
Astro Camp Presentation, Get Away Special Team 2011
Astro Camp Presentation, Get Away Special Team 2011
Education and Outreach
No abstract provided.
Seasonal Variability And Dynamics Of Mesospheric Gravity Waves Over The Andes, Neal R. Criddle, Michael J. Taylor, P. D. Pautet, Y. Zhao
Seasonal Variability And Dynamics Of Mesospheric Gravity Waves Over The Andes, Neal R. Criddle, Michael J. Taylor, P. D. Pautet, Y. Zhao
Graduate Student Posters
The ALO is a new facility developed for atmospheric research, located at the foot of the Andes mountain range in Cerro Pachon, Chile (30.2°S, 70.7°W). As part of a collaborative program, Utah State has a mesospheric temperature mapper (MTM) on site, which is used to study short period gravity wave dynamics and temperature variations in the mesosphere-lower thermosphere region. The MTM began taking measurements of the OH(6,2) and O2(0,1) spectral bands in August 2009 and a complete profile of seasonal variation in gravity wave characteristics has been created for August 2009 through August 2010 using the OH(6,2) Band. The primary …
A Systematic Construction Of Curved Phase Space: A Gravitational Gauge Theory With Symplectic Form, Jeffrey Hazboun, James Thomas Wheeler
A Systematic Construction Of Curved Phase Space: A Gravitational Gauge Theory With Symplectic Form, Jeffrey Hazboun, James Thomas Wheeler
Presentations
No abstract provided.
Surface Geometry And Heat Flux Effect On Thin Wire Nucleate Pool Boiling Of Subcooled Water In Mictrogravity, Troy Munro, Heng Ban
Surface Geometry And Heat Flux Effect On Thin Wire Nucleate Pool Boiling Of Subcooled Water In Mictrogravity, Troy Munro, Heng Ban
Presentations
No abstract provided.
Surface Geometry And Heat Flux Effect On Thin Wire Nucleate Pool Boiling Of Subcooled Water In Microgravity, Troy Munro, Heng Ban, Jr Dennison
Surface Geometry And Heat Flux Effect On Thin Wire Nucleate Pool Boiling Of Subcooled Water In Microgravity, Troy Munro, Heng Ban, Jr Dennison
Presentations
No abstract provided.
Electron Induced Luminescence Of Insulating Polymeric Materials, Doug Ball
Electron Induced Luminescence Of Insulating Polymeric Materials, Doug Ball
Senior Theses and Projects
The study of luminescence and electron transport in disordered insulating materials provides detailed information about the material structure and interaction of incident electrons within a material. Electron induced luminescence of insulating polymeric materials has been observed in tests by the USU Materials Physics group. Conduction electrons can transition between extended states in the valence and conduction band and a distribution of localized trapped states within the band gap. Electron transport and luminescence is governed by the distribution of states and transition rates between them. This study investigates the exponentially decaying signatures of both luminescence and sample current of M55J under …
A Time-Of-Flight Mass Spectrometer For Upper Atmospheric Measurements, Addison E. Everett, E. A. Syrstad
A Time-Of-Flight Mass Spectrometer For Upper Atmospheric Measurements, Addison E. Everett, E. A. Syrstad
Graduate Student Posters
The mesosphere-lower thermosphere (MLT) is perhaps the least understood region of the earth’s atmosphere due to the difficulty of obtaining in-situ measurements. Access to the MLT is limited to high-speed sounding rockets for brief periods of at most a few minutes. Because of its wide mass range and high scan rate, Time-of-flight mass spectrometry (TOF-MS) has potential to resolve thin layers of diverse species in the MLT. However, because ambient pressures can reach into the millitorr range, TOF-MS has rarely been applied in the MLT due to its dependence on high voltages and microchannel plate (MCP) detectors. A novel dual …
Early Observations Of The Middle Atmosphere Above Usu With The World’S Most Sensitive Lidar, Lance W. Petersen, Marcus J. Bingham, Vincent B. Wickwar, Joshua P. Herron
Early Observations Of The Middle Atmosphere Above Usu With The World’S Most Sensitive Lidar, Lance W. Petersen, Marcus J. Bingham, Vincent B. Wickwar, Joshua P. Herron
Posters
Extensive measurements have been made of the upper atmosphere by satellites and the lower atmosphere is measured twice daily by weather balloons. In contrast, the middle atmosphere is a difficult area to measure and therefore has been much less extensively studied. We are currently upgrading an old lidar system to a new system that will be 70 times more sensitive, making this the most sensitive lidar of its kind in the world. The upgrade consists of combining the outputs of 18 and 24 watt Nd:YAG lasers; implementing an optical chain to detect backscattered light using an existing large, four-mirror telescope; …
Quantum Gravity In Relativistic Phase Space, Jeffrey Hazboun
Quantum Gravity In Relativistic Phase Space, Jeffrey Hazboun
Presentations
No abstract provided.
Effects Of Micro-Gravity On Thin-Wire Subcooled Nucleate Boiling Dynamics, Troy Munro, Andrew Fassmann
Effects Of Micro-Gravity On Thin-Wire Subcooled Nucleate Boiling Dynamics, Troy Munro, Andrew Fassmann
Posters
Nucleate boiling is a highly effective means of transferring heat, and as space exploration begins to reach farther from Earth, efficient heat management systems in microgravity are becoming increasingly important. In the summer of 2010, members of the USU Get Away Special (GAS) team flew aboard NASA’s Weightless Wonder in order to study the effect of various system parameters on nucleate boiling heat transfer behavior in microgravity. This one dimensional study of boiling used a new geometry never tried before and concluded that heat transfer rates during boiling in microgravity do not significantly differ from those observed on Earth. These …
Development Of Optimal Bubble-Seeding Microheaters To Study Nucleate Boiling Heat Transfer In Microgravity, Ryan Martineau, Iggy Matheson, Landon Hillyard
Development Of Optimal Bubble-Seeding Microheaters To Study Nucleate Boiling Heat Transfer In Microgravity, Ryan Martineau, Iggy Matheson, Landon Hillyard
Posters
Heat management is a critical issue facing engineers of spaceflight systems. Nucleate boiling has high heat transfer rates, but further study is needed to apply this method effectively to a heat transfer system in a microgravity environment. The USU Get Away Special (GAS) team is conducting a series of experiments aboard NASA's "Weightless Wonder" aircraft to further understanding of nucleate boiling activity in microgravity. Two specific focuses of the current experiment are determining optimal surface geometries of microheater arrays designed to induce nucleate boiling and constructing a lighting and video system to spatially and temporally resolve the anticipated jets of …
Surface Geometry And Heat Flux Effect On Thin Wire Nucleate Pool Boiling Of Subcooled Water In Microgravity, Troy Munro, Andrew Fassman, Heng Ban, Jr Dennision
Surface Geometry And Heat Flux Effect On Thin Wire Nucleate Pool Boiling Of Subcooled Water In Microgravity, Troy Munro, Andrew Fassman, Heng Ban, Jr Dennision
Conference Proceedings
In the summer of 2010, undergraduates from the USU Get Away Special team flew a nucleate pool boiling experiment on NASA’s Weightless Wonder to study nucleate boiling heat transfer in microgravity. The motivation of this research was to understand the effects of surface geometry and heat flux applied to a thin wire heater for the design and development of efficient thermal management systems for space applications. The specific objectives were to observe and characterize behaviors of boiling onset, steady state heat transfer, and bubble dynamics with respect to nucleate boiling of subcooled water.. Using three thin platinum wire geometries and …
Boil, Boil, Toil, And Trouble - Connecting With The Community Through Microgravity Boiling Experiments, Troy Munro, Andrew Fassmann, Heng Ban, John R. Dennison
Boil, Boil, Toil, And Trouble - Connecting With The Community Through Microgravity Boiling Experiments, Troy Munro, Andrew Fassmann, Heng Ban, John R. Dennison
All Physics Faculty Publications
No abstract provided.
Surface Geometry And Heat Flux Effect On Thin Wire Nucleate Pool Boiling Of Subcooled Water In Microgravity, Troy Munro, Andrew Fassman
Surface Geometry And Heat Flux Effect On Thin Wire Nucleate Pool Boiling Of Subcooled Water In Microgravity, Troy Munro, Andrew Fassman
Presentations
The motivation of this nucleate boiling research is to understand the effects of surface geometry and heat flux as applied to a thin wire heater. This will further the understanding of the fundamental behaviors of boiling onset, steady state heat transfer, and bubble dynamics with respect to nucleate boiling with the goal of creating efficient thermal management systems for future space applications. Using three different thin platinum wire geometries and five different power levels, subcooled water was boiled over a period of approximately 30 seconds for 15 parabolic arcs to simulate microgravity. To represent the trends in bubbles behavior across …
In Situ Checks Of Sonic Anemometer Temperature Calibration, David Cook, Michael Negale
In Situ Checks Of Sonic Anemometer Temperature Calibration, David Cook, Michael Negale
Physics Student Research
The temperature calibration of the Gill Instruments WindMaster Pro sonic anemometer used in the ARM SGP ECOR systems is actually a curve, but is approximated with a linear fit for field use. The original calibrations were performed in a temperature-controlled chamber. The linear fit slope is only applied to the calculation of sensible heat flux and not to the reported temperature. The linear fit results in an underestimate of sensible heat flux during cold ambient temperatures and an overestimate during hot ambient temperatures. In situ calibrations performed using five years of ARM SGP data reveal how poorly the temperature is …
Effects Of Heat Flux On Nucleate Boiling In Microgravity, Andrew Fassman
Effects Of Heat Flux On Nucleate Boiling In Microgravity, Andrew Fassman
Presentations
No abstract provided.
The Design And Construction Of A Microgravity Boiling Experiment, Troy Munro
The Design And Construction Of A Microgravity Boiling Experiment, Troy Munro
Presentations
No abstract provided.
Lettau Affect Colloquium: Or Seeing Natural Philosophy With Len, Leonard F. Hall
Lettau Affect Colloquium: Or Seeing Natural Philosophy With Len, Leonard F. Hall
All Physics Faculty Publications
No abstract provided.
Airglow Observations And Modeling Of F Region Depletion Zonal Velocities Over Christmas Island, N. P. Chapagain, Michael J. Taylor, K. Nielsen, M. J. Jarvis
Airglow Observations And Modeling Of F Region Depletion Zonal Velocities Over Christmas Island, N. P. Chapagain, Michael J. Taylor, K. Nielsen, M. J. Jarvis
All Physics Faculty Publications
We report image measurements of plasma depletions in the equatorial F region ionosphere over Christmas Island (2.1°N, 157.4°W; dip latitude 2.8°N) in the central Pacific Ocean. The observations were made during the equinox period, September‐October 1995, using a Utah State University CCD imaging system filtered to observe thermospheric O I (630.0 nm) airglow emissions centered at ∼280 km altitude. Well‐defined magnetic field‐aligned depletions were observed on 18 nights during the campaign, including strong postmidnight fossilized structures, enabling detailed measurements of their morphology and dynamics. The number of depletions was influenced by their initial onset times and their persistence. The separations …