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Articles 1591 - 1620 of 6102
Full-Text Articles in Entire DC Network
Early Science Results From The Nasa Van Allen Probes Mission Rbsp-Ect Instrument Suite, Harlan E. Spence, Geoff Reeves, Rbspect Team
Early Science Results From The Nasa Van Allen Probes Mission Rbsp-Ect Instrument Suite, Harlan E. Spence, Geoff Reeves, Rbspect Team
Physics & Astronomy
No abstract provided.
The Radiation Environment Near The Lunar Surface: Crater Observations And Geant4 Simulations, M. D. Looper, J. E. Mazur, J. B. Blake, Harlan E. Spence, Nathan A. Schwadron, M. J. Golightly, A. W. Case, J. C. Kasper, L. W. Townsend
The Radiation Environment Near The Lunar Surface: Crater Observations And Geant4 Simulations, M. D. Looper, J. E. Mazur, J. B. Blake, Harlan E. Spence, Nathan A. Schwadron, M. J. Golightly, A. W. Case, J. C. Kasper, L. W. Townsend
Physics & Astronomy
[1] At the start of the Lunar Reconnaissance Orbiter mission in 2009, its Cosmic Ray Telescope for the Effects of Radiation instrument measured the radiation environment near the Moon during the recent deep solar minimum, when galactic cosmic rays (GCRs) were at the highest level observed during the space age. We present observations that show the combined effects of GCR primaries, secondary particles (“albedo”) created by the interaction of GCRs with the lunar surface, and the interactions of these particles in the shielding material overlying the silicon solid-state detectors of the Cosmic Ray Telescope for the Effects of Radiation. We …
New Insight Into The Inner Magnetosphere Plasma Regimes With The Van Allen Probes (Rbsp), Joerg-Micha Jahn, Richard E. Denton, Herbert O. Funsten, Geoff Reeves, Harlan E. Spence
New Insight Into The Inner Magnetosphere Plasma Regimes With The Van Allen Probes (Rbsp), Joerg-Micha Jahn, Richard E. Denton, Herbert O. Funsten, Geoff Reeves, Harlan E. Spence
Physics & Astronomy
No abstract provided.
Per Berglund Professor Of Physics Travels To Germany, Per Berglund
Per Berglund Professor Of Physics Travels To Germany, Per Berglund
Faculty Travel Reports
The CIE grant provided financial support to travel in May 2013 to Hamburg, Germany to visit DESY, the German Electron Synchrotron, one of the world's leading particle accelerators used to study the fundamental constituents of nature and their interactions. My local expenses were covered by a Collaborative Research Center (SFB) fellowship that I was awarded through SFB’s 676 "Particle, Strings and the Early Universe--The Structure of Matter and Space-Time" hosted by DESY and the University of Hamburg. Together these awards facilitated two months of visits and collaborations with theoretical physicists at DESY in 2013.
Researching Soil Hydrogen Dynamics In Subarctic Sweden, Victoria Lynn Ward
Researching Soil Hydrogen Dynamics In Subarctic Sweden, Victoria Lynn Ward
Inquiry Journal 2013
No abstract provided.
Underwater Radiated Noise Levels Of A Research Icebreaker In The Central Arctic Ocean, Ethan H. Roth, Val E. Schmidt, John A. Hildebrand, Sean M. Wiggins
Underwater Radiated Noise Levels Of A Research Icebreaker In The Central Arctic Ocean, Ethan H. Roth, Val E. Schmidt, John A. Hildebrand, Sean M. Wiggins
Center for Coastal and Ocean Mapping
U.S. Coast Guard Cutter Healy's underwater radiated noise signature was characterized in the central Arctic Ocean during different types of ice-breaking operations. Propulsion modes included transit in variable ice cover, breaking heavy ice with backing-and-ramming maneuvers, and dynamic positioning with the bow thruster in operation. Compared to open-water transit, Healy's noise signature increased approximately 10 dB between 20 Hz and 2 kHz when breaking ice. The highest noise levels resulted while the ship was engaged in backing-and-ramming maneuvers, owing to cavitation when operating the propellers astern or in opposing directions. In frequency bands centered near 10, 50, and 100 Hz, …
Recovery From Disturbance Requires Resynchronization Of Ecosystem Nutrient Cycles, Edward B. Rastetter, Ruth D. Yanai, R Quinn Thomas, Matthew A. Vadeboncoeur, Timothy J. Fahey, Melany C. Fisk, Bonnie L. Kwiatkowski, Steven P. Hamburg
Recovery From Disturbance Requires Resynchronization Of Ecosystem Nutrient Cycles, Edward B. Rastetter, Ruth D. Yanai, R Quinn Thomas, Matthew A. Vadeboncoeur, Timothy J. Fahey, Melany C. Fisk, Bonnie L. Kwiatkowski, Steven P. Hamburg
All Materials
Nitrogen (N) and phosphorus (P) are tightly cycled in most terrestrial ecosystems, with plant uptake more than 10 times higher than the rate of supply from deposition and weathering. This near-total dependence on recycled nutrients and the stoichiometric constraints on resource use by plants and microbes mean that the two cycles have to be synchronized such that the ratio of N:P in plant uptake, litterfall, and net mineralization are nearly the same. Disturbance can disrupt this synchronization if there is a disproportionate loss of one nutrient relative to the other. We model the resynchronization of N and P cycles following …
Circle Talks As Situated Experiential Learning: Context, Identity, And Knowledgeability In 'Learning From Reflection', Jayson O. Seaman, Alison Rheingold
Circle Talks As Situated Experiential Learning: Context, Identity, And Knowledgeability In 'Learning From Reflection', Jayson O. Seaman, Alison Rheingold
Kinesiology
This article presents research that used ethnographic and sociolinguistic methods to study ways participants learn through reflection when carried out as a “circle talk.” The data indicate that participants in the event (a) invoked different contextual frames that (b) implicated them in various identity positions, which (c) affected how they could express their knowledge. These features worked together to generate socially shared meanings that enabled participants to jointly achieve conceptualization—the ideational role “reflection” is presumed to play in the experiential learning process. The analysis supports the claim that participants generate new knowledge in reflection, but challenges individualistic and cognitive assumptions …
The Quest For Alternatives To U.S. Education Reform, William B. Dyke
The Quest For Alternatives To U.S. Education Reform, William B. Dyke
Honors Theses and Capstones
No abstract provided.
Definitions In Mathematics: What Do High School Students Know?, Julianne Sacco
Definitions In Mathematics: What Do High School Students Know?, Julianne Sacco
Honors Theses and Capstones
No abstract provided.
Chosen Multiplication Algorithms And The Ability To Learn New Methods, Catherine A. Tarushka
Chosen Multiplication Algorithms And The Ability To Learn New Methods, Catherine A. Tarushka
Honors Theses and Capstones
No abstract provided.
A Critique Of The Free Will Defense, A Comprehensive Look At Alvin Plantinga’S Solution To The Problem Of Evil., Justin Ykema
A Critique Of The Free Will Defense, A Comprehensive Look At Alvin Plantinga’S Solution To The Problem Of Evil., Justin Ykema
Honors Theses and Capstones
No abstract provided.
A Statistical Analysis Of Electromagnetic Ion Cyclotron (Emic) Waves And Their Correlation To The 11-Year Solar Cycle, Erik A. Lindgren
A Statistical Analysis Of Electromagnetic Ion Cyclotron (Emic) Waves And Their Correlation To The 11-Year Solar Cycle, Erik A. Lindgren
Honors Theses and Capstones
This thesis presents a statistical analysis of EMIC waves measured at Halley Research Station from 2008 through 2012. An introduction covering the origin of and theory behind EMIC waves is provided, along with a background covering previous statistical research regarding EMIC waves. Guidelines regarding EMIC wave definition and analysis are described along with examples of how they were used. The data shows an increase in the total number of EMIC waves as well as the number and percentage of EMIC waves with maximum frequency above 1 Hz during the 5-year period. The results suggest that the total number of EMIC …
Customer Age As A Predictor Of Contact Volume, Tollan Renner
Customer Age As A Predictor Of Contact Volume, Tollan Renner
Honors Theses and Capstones
A two stage modeling approach for modeling customer age as a predictor of contact volume was conducted using a real-world data set of approximately 2,000,000 contacts from a company call center. Two models were constructed in the first stage, one a straightforward regression and the other a series of regressions. One was selected as better performing and scaled up to predict calls received from calls answered. The second stage of the modeling included a day of the week covariate and performed the best of the models created. This model uses age bins as model effects, of which the youngest age …
Analysis Of Shear Lag In Steel Angle Connectors, Benjamin Sawyer
Analysis Of Shear Lag In Steel Angle Connectors, Benjamin Sawyer
Honors Theses and Capstones
Previous research has found an empirically based method for calculating the effective net area defined by stress distributions created by tensile loads in steel connections. Based on the results from that method a theoretical alternative is explored to simplify the process of determining the effective net area.
Kinetics Of Lipid Extraction From Microalgae, Brian Mcconnell
Kinetics Of Lipid Extraction From Microalgae, Brian Mcconnell
Honors Theses and Capstones
No abstract provided.
Cycling Of Molecular Hydrogen In Subarctic Sweden, Victoria Ward
Cycling Of Molecular Hydrogen In Subarctic Sweden, Victoria Ward
Honors Theses and Capstones
No abstract provided.
"Who Will [Independence] Please But Ambitious Men?": Rebels, Loyalists, And The Language Of Liberty In The American Revolution, Alexa Price
Inquiry Journal 2013
No abstract provided.
Parallel And Distributed Performance Of A Depth Estimation Algorithm, Brian R. Calder
Parallel And Distributed Performance Of A Depth Estimation Algorithm, Brian R. Calder
Center for Coastal and Ocean Mapping
Expansion of dataset sizes and increasing complexity of processing algorithms have led to consideration of parallel and distributed implementations. The rationale for distributing the computational load may be to thin-provision computational resources, to accelerate data processing rate, or to efficiently reuse already available but otherwise idle computational resources. Whatever the rationale, an efficient solution of this type brings with it questions of data distribution, job partitioning, reliability, and robustness. This paper addresses the first two of these questions in the context of a local cluster-computing environment. Using the CHRT depth estimator, it considers active and passive data distribution and their …
Endothelial Activation Microparticles And Inflammation Status Improve With Exercise Training In African Americans, Dianne M. Babbitt, Keith M. Diaz, Deborah L. Feairheller, Kathleen M. Sturgeon, Amanda M. Perkins, Praveen Veerabhadrappa, Sheara T. Williamson, Jan Krezschmar, Chenyi Ling, Hojun Lee, Heather Grimm, Sunny R. Thakkar
Endothelial Activation Microparticles And Inflammation Status Improve With Exercise Training In African Americans, Dianne M. Babbitt, Keith M. Diaz, Deborah L. Feairheller, Kathleen M. Sturgeon, Amanda M. Perkins, Praveen Veerabhadrappa, Sheara T. Williamson, Jan Krezschmar, Chenyi Ling, Hojun Lee, Heather Grimm, Sunny R. Thakkar
Faculty Publications
African Americans have the highest prevalence of hypertension in the world which may emanate from their predisposition to heightened endothelial inflammation. The purpose of this study was to determine the effects of a 6-month aerobic exercise training (AEXT) intervention on the inflammatory biomarkers interleukin-10 (IL-10), interleukin-6 (IL-6), and endothelial microparticle (EMP) CD62E+ and endothelial function assessed by flow-mediated dilation (FMD) in African Americans. A secondary purpose was to evaluate whether changes in IL-10, IL-6, or CD62E+ EMPs predicted the change in FMD following the 6-month AEXT intervention. A pre-post design was employed with baseline evaluation including office blood pressure, FMD, …
Experimental And Natural Warming Elevates Mercury Concentrations In Estuarine Fish, Jennifer A. Dijkstra, Kate L. Buckman, Darren Ward, David W. Evans, Michele Dionne, Celia Chen
Experimental And Natural Warming Elevates Mercury Concentrations In Estuarine Fish, Jennifer A. Dijkstra, Kate L. Buckman, Darren Ward, David W. Evans, Michele Dionne, Celia Chen
Center for Coastal and Ocean Mapping
Marine food webs are the most important link between the global contaminant, methylmercury (MeHg), and human exposure through consumption of seafood. Warming temperatures may increase human exposure to MeHg, a potent neurotoxin, by increasing MeHg production as well as bioaccumulation and trophic transfer through marine food webs. Studies of the effects of temperature on MeHg bioaccumulation are rare and no study has specifically related temperature to MeHg fate by linking laboratory experiments with natural field manipulations in coastal ecosystems. We performed laboratory and field experiments on MeHg accumulation under varying temperature regimes using the killifish, Fundulus heteroclitus. Temperature treatments were …
Towards In Situ Correlation Of Atomic Structure And Device Functionality In Graphene-Based Devices, Shawna M. Hollen, N M. Santagata, Justin R. Young, Jay A. Gupta, Ezekiel Johnston-Halperin
Towards In Situ Correlation Of Atomic Structure And Device Functionality In Graphene-Based Devices, Shawna M. Hollen, N M. Santagata, Justin R. Young, Jay A. Gupta, Ezekiel Johnston-Halperin
Physics & Astronomy
No abstract provided.
Transport Behavior Of Ultrathin Films With Nanothickness Undulations In The Strongly Localized Regime, J C. Joy, Shawna M. Hollen, C Zhao, G. E. Fernandes, J M. Xu, J M. Valles Jr.
Transport Behavior Of Ultrathin Films With Nanothickness Undulations In The Strongly Localized Regime, J C. Joy, Shawna M. Hollen, C Zhao, G. E. Fernandes, J M. Xu, J M. Valles Jr.
Physics & Astronomy
No abstract provided.
Observation Of The Collapse Of The Cooper Pair Phase Coherence Length At A Superconductor To Insulator Transition, J M. Valles Jr., Shawna M. Hollen, G. E. Fernandes, Jimmy Xu
Observation Of The Collapse Of The Cooper Pair Phase Coherence Length At A Superconductor To Insulator Transition, J M. Valles Jr., Shawna M. Hollen, G. E. Fernandes, Jimmy Xu
Physics & Astronomy
No abstract provided.
Oceanographic Weather Maps: Using Oceanographic Models To Improve Seabed Mapping Planning And Acquisition, Jonathan Beaudoin, John G.W. Kelley, Jason Greenlaw, Tami Beduhn, Samuel F. Greenaway
Oceanographic Weather Maps: Using Oceanographic Models To Improve Seabed Mapping Planning And Acquisition, Jonathan Beaudoin, John G.W. Kelley, Jason Greenlaw, Tami Beduhn, Samuel F. Greenaway
Center for Coastal and Ocean Mapping
In a world of high precision sensors, one of the few remaining challenges in multibeam echosounding is that of refraction based uncertainty. A poor understanding of oceanographic variability can lead to inadequate sampling of the water mass and the uncertainties that result from this can dominate the uncertainty budget of even state-of-the-art echosounding systems. Though dramatic improvements have been made in sensor accuracies over the past few decades, survey accuracy and efficiency is still potentially limited by a poor understanding of the “underwater weather”. Advances in the sophistication of numerical oceanographic forecast modeling, combined with ever increasing computing power, allow …
Exploration Of Eratosthenes Seamount – A Continental Fragment Being Forced Down An Oceanic Trench, Garrett Mitchell, Larry A. Mayer, Katherine L.C. Bell, Nicole A. Raineault, Chris Roman, Robert D. Ballard, Kelsey Cornwell, Al Hine, Eugene Shinn, Iordanis Dimitriadis, Onac Bogdan
Exploration Of Eratosthenes Seamount – A Continental Fragment Being Forced Down An Oceanic Trench, Garrett Mitchell, Larry A. Mayer, Katherine L.C. Bell, Nicole A. Raineault, Chris Roman, Robert D. Ballard, Kelsey Cornwell, Al Hine, Eugene Shinn, Iordanis Dimitriadis, Onac Bogdan
Center for Coastal and Ocean Mapping
No abstract provided.
Sobol' Sensitivity Analysis Of The Holocene Peat Model: What Drives Carbon Accumulation In Peatlands?, Anne Quillet, Michelle Garneau, Steve Frolking
Sobol' Sensitivity Analysis Of The Holocene Peat Model: What Drives Carbon Accumulation In Peatlands?, Anne Quillet, Michelle Garneau, Steve Frolking
Earth Sciences
Understanding the development of northern peatlands and their carbon accumulation dynamics is crucial in order to confidently integrate northern peatlands into global carbon cycle models. To achieve this, northern peatland models are becoming increasingly complex and now include feedback processes between peat depth, decomposition, hydrology, and vegetation composition and productivity. Here we present results from a global sensitivity analysis performed to assess the behavior and parameter interaction of a peatland simulation model. A series of simulations of the Holocene Peat Model were performed with different parameter combinations in order to assess the role of parameter interactions on the simulated total …
Future Directions In Hydrography Using Satellite-Derived Bathymetry, Shachak Pe'eri, Christopher Parrish, Lee Alexander, Chukwuma Azuike, Andy Armstrong, Maryellen Sault
Future Directions In Hydrography Using Satellite-Derived Bathymetry, Shachak Pe'eri, Christopher Parrish, Lee Alexander, Chukwuma Azuike, Andy Armstrong, Maryellen Sault
Center for Coastal and Ocean Mapping
Satellite remote sensing provides useful reconnaissance tool for mapping near-shore bathymetry, characterizing a coastal area and monitoring any seafloor changes that may have occurred since the last hydrographic survey of the area. At the 2012 Canada Hydro conference, a study was presented on the potential use of Landsat satellite imagery to map shallow-water bathymetry in a GIS environment over three study sites. Since then, several collaborations between the current study group and various hydrographic organizations were established with the goal of implementing optically-derived bathymetry as part of their data acquiring procedure. Bathymetry over additional study sites around the world was …
Water-Column Variability Assessment For Underway Profilers To Improve Efficiency And Accuracy Of Multibeam Surveys, Matt Wilson, Jonathan Beaudoin, Steve Smyth
Water-Column Variability Assessment For Underway Profilers To Improve Efficiency And Accuracy Of Multibeam Surveys, Matt Wilson, Jonathan Beaudoin, Steve Smyth
Center for Coastal and Ocean Mapping
With the advent of underway profilers, sampling the water-column to obtain sound speed corrections is no longer a detriment to hydrographic survey efficiency. Instead, the challenge has become deciding how many casts are necessary to maintain a desired level of multibeam sounding accuracy, while not needlessly overworking the profiler. Ray tracing uncertainty analysis can determine in hindsight whether a particular sampling interval is adequate or not. Based on this methodology, an algorithm was developed to generate recommended sampling intervals based on successively acquired sound speed profiles, allowing the MVP to run in a “cruise-control” mode where the sampling interval is …
Distribution-Free, Variable Resolution Depth Estimation With Composite Uncertainty, Brian R. Calder
Distribution-Free, Variable Resolution Depth Estimation With Composite Uncertainty, Brian R. Calder
Center for Coastal and Ocean Mapping
Recent algorithms for processing hydrographic data have treated the problem of achievable resolution by constructing grids of fixed resolution, a composite grid of variable resolution, recursive sub-division in a quad-tree, or by relying on a comprehensive TIN of the original points. These algorithms all impose some artificial structure on the data to allow for efficient computation, however, which this paper attempts to address. A scheme is outlined which provides a robust estimate of depth and associated uncertainty that makes as few assumptions as possible. Using a non-uniform spectral analysis, it estimates the spatial scales at which the data are consistent …