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Articles 1 - 8 of 8
Full-Text Articles in Physics
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 …
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 …
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.
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 …
Space Weather And Technological Impacts, Jennifer L. Meehan, G. Fisher, W. Murtagh
Space Weather And Technological Impacts, Jennifer L. Meehan, G. Fisher, W. Murtagh
All Physics Faculty Publications
No abstract provided.
Surface Geometry And Heat Flux Effects Onnucleate Pool Boiling Of Subcooled Water In Microgravity, Troy Munro, Andrew Fassman, Heng Ban, John R. Dennison
Surface Geometry And Heat Flux Effects Onnucleate Pool Boiling Of Subcooled Water In Microgravity, Troy Munro, Andrew Fassman, Heng Ban, John R. Dennison
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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 …
Space Weather Community Operations Workshop: Planning For The Next Decade, J. J. Fulgham, Jennifer L. Meehan, W. K. Tobiska
Space Weather Community Operations Workshop: Planning For The Next Decade, J. J. Fulgham, Jennifer L. Meehan, W. K. Tobiska
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Scenario: Japan suffers a great earthquake, a major tsunami, and a catastrophic nuclear meltdown. Telecommunications landlines and cell phone towers are inoperable in northern prefectures. This means that high-frequency (HF) radio becomes the primary means of communication to some affected areas. This also means that 3-hour forecasts of HF availability must be provided by space weather service organizations not affected by the disaster (Figure 1). Questions: How accurate are the HF predictions? How reliable is the service? How available is the information?
New Space Weather Products For Hf Radio, Gps Navigation, And Aviation, Jennifer L. Meehan
New Space Weather Products For Hf Radio, Gps Navigation, And Aviation, Jennifer L. Meehan
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No abstract provided.