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Full-Text Articles in Physics

Addressing Light Pollution At Utah State University, Rachel Nydegger Mar 2015

Addressing Light Pollution At Utah State University, Rachel Nydegger

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Many outdoor light fixtures illuminate in all directions, meaning that a large por- tion of light emitted is sent upwards. This excess of light light pollution – repre- sents wasted energy and money, decreases public safety, harms nocturnal and migra- tory animals, and destroys our view of the night sky. While Utah State University Facilities does have a program in place to retrofit light fixtures, and newly installed fixtures are chosen with light pollution in consideration, many of the light posts on campus continue to pollute the night sky. With the support of the Student Sustain- ability Offices Blue Goes Green ...


Stomatal Physics, Katie Sweet, Keith Mott, David Peak Oct 2014

Stomatal Physics, Katie Sweet, Keith Mott, David Peak

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Stomata, microscopic pores on a leaf’s surface, regulate the diffusion of CO2 from, and the diffusion of water vapor to, the air.

Stomata are responsible for fixing essentially all carbon in the biosphere and generating over 90% of the water vapor in the atmosphere over landmasses.

Exactly how stomata respond to temperature, light intensity, and ambient CO2 and humidity, is still a matter of active debate.

Most research probing this question focuses on identifying and unraveling complicated biochemistry. Recent investigations in our laboratory, however, indicate that much of stomatal behavior can be understood in terms of a simple vapor ...


Two-Dimensional Electron Gases At The Surface Of Potassium Tantalate, Ben Pound Aug 2014

Two-Dimensional Electron Gases At The Surface Of Potassium Tantalate, Ben Pound

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No abstract provided.


Annual Solar Motion And Spy Satellites, Margaret Jensen, Shane L. Larson Jan 2014

Annual Solar Motion And Spy Satellites, Margaret Jensen, Shane L. Larson

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A topic often taught in introductory astronomy courses is the changing position of the Sun in the sky as a function of time of day, and season. The relevance and importance of this motion is explained in the context of seasons and the impact it has on human activities such as agriculture. The geometry of the ob- served motion in the sky is usually reduced to graphical representations and visualizations that can be difficult to render and grasp. Sometimes students are asked to observe the Suns changing motion and record their data, but this is a long-term project requiring several ...


Characterizing And Quantifying Time Dependent Night Sky Brightness In And Around Tucson, Arizona, Rachel K. Nydegger, Constance E. Walker Jan 2014

Characterizing And Quantifying Time Dependent Night Sky Brightness In And Around Tucson, Arizona, Rachel K. Nydegger, Constance E. Walker

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As part of a Research Experience for Undergraduates (REU) program with the National Optical Astronomy Observatory (NOAO), I (with mentor Dr. Constance Walker of NOAO) characterized light pollution in and near Tucson, Arizona using eight Sky Quality Meters (SQMs). In order to analyze the data in a consistent way for comparison, we created a standard procedure for reduction and analysis using python and MATLAB. The series of python scripts remove faulty data and examine specifically anthropogenic light pollution by excluding contributions made by the sun, moon, and the Milky Way. We then use MATLAB codes to illustrate how the light ...


Global Nightly Oh And O2 Mesospheric Airglow: Examining A Decade Of Measurements Using The Nasa Saber Satellite Sensor, Jonathan Price, Jordan C. Rozum, Gene Ware, Doran Baker Jan 2014

Global Nightly Oh And O2 Mesospheric Airglow: Examining A Decade Of Measurements Using The Nasa Saber Satellite Sensor, Jonathan Price, Jordan C. Rozum, Gene Ware, Doran Baker

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The SABER instrument aboard the TIMED satellite is a multichannel radiometer and has been continuously measuring the altitude distribution of infrared airglow intensity in the mesosphere on a global basis since 2002. While the majority of these altitude distributions are Gaussian-like, a significant portion exhibit two or more local maxima, suggesting multiple airglow layers. To better understand the cause of this phenomenon, the global and temporal distributions of infrared OH andO2 scans resulting in multiple peak altitude profiles are being examined.


Functionalizing Carbon Nanotube Forests With 1,5-Diaminoaphthalene, Ben Pound, T. -C. Shen Oct 2013

Functionalizing Carbon Nanotube Forests With 1,5-Diaminoaphthalene, Ben Pound, T. -C. Shen

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No abstract provided.


Understanding Light Pollution In And Around Tucson, Arizona, Rachel K. Nydegger Aug 2013

Understanding Light Pollution In And Around Tucson, Arizona, Rachel K. Nydegger

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No abstract provided.


Resolving Ionospheric E-Region Modeling Challenges: The Solar Photon Flux Dependence, Joseph B. Jensen, Jan J. Sojka, Michael David, Kent Tobiska, Robert W. Schunk, Tom Woods, Frank Eparvier Apr 2013

Resolving Ionospheric E-Region Modeling Challenges: The Solar Photon Flux Dependence, Joseph B. Jensen, Jan J. Sojka, Michael David, Kent Tobiska, Robert W. Schunk, Tom Woods, Frank Eparvier

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The EVE instrument of the NASA Solar Dynamics Observatory (SDO) provides for the first time EUV and XUV measurements of the solar irradiance that adequately define the major source of ionization of the atmosphere. In our study we modeled the E-region of the ionosphere and analyzed how it is affected by the solar irradiance data obtained by EVE and contrast this with the S2000 Solar Irradiance model, used previously. The ionosphere has two major layers, the E-layer at 100 km, and the F-layer at 300 km. The difference in solar irradiances are small except at some wavelength bands, it is ...


Small-Scale Simulation Chamber For Space Environment Survivability Testing, Robert H. Johnson, Lisa D. Montierth, Jr Dennison, James S. Dyer, Ethan R. Lindstrom Jan 2013

Small-Scale Simulation Chamber For Space Environment Survivability Testing, Robert H. Johnson, Lisa D. Montierth, Jr Dennison, James S. Dyer, Ethan R. Lindstrom

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A vacuum chamber was designed that simulates the space environment to facilitate tests of material modification due to space environment interactions. Critical environmental elements to be simulated include an ultra high vacuum, a FUV/UV/VIS/NIR solar spectrum, an electron plasma flux, temperature extremes, and long duration exposure. To simulate the solar electromagnetic spectrum (EMS), a solar simulator was used with a range of 200 nm to 2000 nm. A Krypton lamp provides surrogate radiation for the prominent far ultraviolet hydrogen Lyman-α 120 nm emission not produced by the solar simulator. A mono-energetic electron flood gun (20 eV to ...


Multiple Peaks In Saber Mesospheric Oh Emission Altitude Profiles, Jordan Rozum, Gene A. Ware, Doran J. Baker, Martin G. Wlynczak, James M. Russell Dec 2012

Multiple Peaks In Saber Mesospheric Oh Emission Altitude Profiles, Jordan Rozum, Gene A. Ware, Doran J. Baker, Martin G. Wlynczak, James M. Russell

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No abstract provided.


High-Frequency Pulsed-Electro-Acoustic (Pea) Measurements For Mapping Charge Distribution, Kristina Sorensen, Lee H. Pearson, Jr Dennison, Timothy E. Doyle, Kent D. Hartley Oct 2012

High-Frequency Pulsed-Electro-Acoustic (Pea) Measurements For Mapping Charge Distribution, Kristina Sorensen, Lee H. Pearson, Jr Dennison, Timothy E. Doyle, Kent D. Hartley

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No abstract provided.


Modeling Spiral Galaxy Luminosity Profiles, Jordan Rozum, Matt Garlock, Shane L. Larson, Bradley W. Carroll Oct 2012

Modeling Spiral Galaxy Luminosity Profiles, Jordan Rozum, Matt Garlock, Shane L. Larson, Bradley W. Carroll

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The distribution of spiral and bar galaxy inclination an- gles is expected to be uniform. However, analysis of sev- eral major galaxy catalogs shows this is not the case; galaxies oriented near edge-on are significantly more common in these catalogs. In an attempt to explain this discrepancy, we have developed a galaxy simulation code to compute the appearance of a spiral type galaxy as a function of its morphological parameters. We examine the dependence of observed brightness upon inclination angle by using smooth luminous mass density and in- terstellar medium (ISM) density distributions. The lu- minous mass component is integrated ...


Histological Analysis Of Biological Tissues Using High-Frequency Ultrasound, Kristina Sorensen, Tim Doyle, B. D. Borget, M. Cervantes, H, A. Chappell, B. J. Curtis, M. A. Grover, J. E. Roring, J. E. Stiles, L. A. Thompson Oct 2012

Histological Analysis Of Biological Tissues Using High-Frequency Ultrasound, Kristina Sorensen, Tim Doyle, B. D. Borget, M. Cervantes, H, A. Chappell, B. J. Curtis, M. A. Grover, J. E. Roring, J. E. Stiles, L. A. Thompson

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No abstract provided.


Histological Analysis Of Biological Tissues Using High-Frequency Ultrasound, Kristina Sorensen, Timothy Doyle, Brett D. Boret, Monica Cervantes, J. Andrew Chappell, Bradley J. Curtis, Matthew A. Grover, Janeese E. Stiles, Laurel A. Thompson Oct 2012

Histological Analysis Of Biological Tissues Using High-Frequency Ultrasound, Kristina Sorensen, Timothy Doyle, Brett D. Boret, Monica Cervantes, J. Andrew Chappell, Bradley J. Curtis, Matthew A. Grover, Janeese E. Stiles, Laurel A. Thompson

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No abstract provided.


Comparison Of Saber Oh Measurements To Rocket Photometry Data, Jordan Rozum, Gene A. Ware, Doran J. Baker May 2012

Comparison Of Saber Oh Measurements To Rocket Photometry Data, Jordan Rozum, Gene A. Ware, Doran J. Baker

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In 2002, the Sounding of the Atmosphere us- ing Broadband Emission Radiometry (SABER) instru- ment aboard the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite went online and has since been providing radiometric data concern- ing the mesosphere and lower thermosphere/ionosphere (MLTI) region of the atmosphere. Researchers at the Utah State University NASA Space Grant Consortium have been tasked with validating measurements of the hydroxyl airglow volume emission rates (VER) taken by SABER. To this end, we compare SABER measurements of the altitude distribution of hydroxyl airglow to mea- surements taken by photometers aboard rockets launched between 1961 and ...


Comparison Of Saber Oh Measurements To Rocket Photometry Data, Jordan Rozum, Gene A. Ware, Doran J. Baker Apr 2012

Comparison Of Saber Oh Measurements To Rocket Photometry Data, Jordan Rozum, Gene A. Ware, Doran J. Baker

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No abstract provided.


Development Of Ultrasonic Detection Methods For Cancer Cells In Vivo, Jeffrey B. Goodrich Mar 2010

Development Of Ultrasonic Detection Methods For Cancer Cells In Vivo, Jeffrey B. Goodrich

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A current problem in medicine and specifically breast cancer is the detection of microscopic cancer in surgical margins to ensure all of the cancer has been removed. Current methods rely on extensive pathology work that may take several days to complete. For breast cancer patients, positive findings for cancer in surgical margins require follow-up surgery to remove more tissue. Up to 50% of patients undergoing breast conservation surgery (lumpectomy) require additional surgery. A preferable method would be in vivo microscopic detection for use during surgery. Such methods would reduce risks, costs, and patient suffering that accompany follow-up operations. Ultrasound is ...


Improved Methods For Teaching Science, Stephanie Peterson, Sara Scott Mar 2010

Improved Methods For Teaching Science, Stephanie Peterson, Sara Scott

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Utah State University’s Get Away Special (GAS) team will conduct research aboard NASA's microgravity research aircraft, the “vomit comet,” through the Reduced Gravity Student Flight Opportunities program. Team members come from mechanical and aerospace engineering, computer science, physics, science education, and business backgrounds. The team will spend ten days this summer at NASA’s Johnson Space Center and perform experiments on the aircraft to better understand nucleate boiling, a potential method of efficient heat transfer in space.