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Articles 4201 - 4230 of 57379
Full-Text Articles in Entire DC Network
Byu University Rover Challenge, Ethan Smith, Ben Broce, Phineas Jensen, Aaron Thomas, Jackson Harwood, Caleb Betteridge, Grant Thompson, Ben Duncan, Spencer Stowell, Spencer Mosley, John Carmen, Trevor Reay, Cameron Stoker, Luke Zollinger, Carson Moon, Ian Reid, Ross Beeson, Mihai Stanciu, Ben Wright, Jacob Moore, Joey Mcconkie, Noah Peterson, Brandon Sutherland, Joseph Heal, Marc Killpack
Byu University Rover Challenge, Ethan Smith, Ben Broce, Phineas Jensen, Aaron Thomas, Jackson Harwood, Caleb Betteridge, Grant Thompson, Ben Duncan, Spencer Stowell, Spencer Mosley, John Carmen, Trevor Reay, Cameron Stoker, Luke Zollinger, Carson Moon, Ian Reid, Ross Beeson, Mihai Stanciu, Ben Wright, Jacob Moore, Joey Mcconkie, Noah Peterson, Brandon Sutherland, Joseph Heal, Marc Killpack
Utah Space Grant Consortium
THE CHALLENGE Our objective is to produce a robust and well-defined rover which will score greater than the 90th percentile in each of the University Rover Challenge (URC) missions. These missions are as follows: Extreme Delivery Find, lift, carry and deliver objects up to 5kg in mass to predetermined GPS coordinates and maneuver precisely through difficult terrain. Equipment Servicing Accurately manipulate controls on a mock lander, simulating a human's dexterity and speed. Science Detect life in a desert environment, recording the temperature, moisture, and GPS coordinates at the sample site. Autonomy Navigate to multiple GPS waypoints, detect objects with AI, …
Byu Rocketry: 2023 Irec & Spaceport America Cup, Derrick Walker, Riley Brown, Will Hart, Anya Jeppson, Aidan Rice, Nathan Butler, Bradley Hornfischer, Blake Jensen, Alexander Potter, Joshua Taylor, Dallan Trentman, David Fullwood
Byu Rocketry: 2023 Irec & Spaceport America Cup, Derrick Walker, Riley Brown, Will Hart, Anya Jeppson, Aidan Rice, Nathan Butler, Bradley Hornfischer, Blake Jensen, Alexander Potter, Joshua Taylor, Dallan Trentman, David Fullwood
Utah Space Grant Consortium
BYU Rocketry competed in the 2023 IREC competition at the Spaceport America Cup in the 10,000 ft commercial motor category. The 12 ft and 71 lb. rocket, Solitude beckons to BYU Rocketry’s past while honoring some of Utah’s most towering peaks.
Extracting Meanline Modeling Parameters For Radial Turbomachinery From Cfd, Jason Metten, Dallan Trentman
Extracting Meanline Modeling Parameters For Radial Turbomachinery From Cfd, Jason Metten, Dallan Trentman
Utah Space Grant Consortium
This study uses Computational Fluid Dynamics (CFD) to explore how geometric changes to centrifugal compressors impact key Two-Zone modeling parameters. While centrifugal impellers are an important part of many systems, the flow through such impellers is inherently complicated making performance often difficult to predict. There are many approaches for modeling this complex flow environment, one method being the Two-Zone model developed by Dave Japikse. This model divides all flow through a centrifugal impeller into a primary zone which is isentropic, and a secondary zone which contains losses. To apply this method, a few key parameters are needed. These parameters are …
Precise Impulse Design For Hybrid Rockets Using Machine-Learning Informed Digital Throttle Input, Eric Larsen, Stephen Whitmore, Som Dutta
Precise Impulse Design For Hybrid Rockets Using Machine-Learning Informed Digital Throttle Input, Eric Larsen, Stephen Whitmore, Som Dutta
Utah Space Grant Consortium
Hybrid rocket motors are known to be safer and greener than solid motor rockets. Hybrid rockets provide additional benefits to mission design with the ability to shutdown, restart, and throttle reliably. Capabilities well suited to applications such as sounding rockets, orbital insertion of small satellites, and surface launch systems. The implementation of hybrid rockets does not come without its own complications. A significant uncertainty in hybrid rocket thrust output is the Oxidizer-to-Fuel ratio (O/F) producing variable thrust, also known as the O/F shift. The effect of O/F shift on thrust has the potential to limit the performance and reliability of …
Nitrification Rate Depends On Nitrogen Fertilizer Source In Root-Zones For Bioregenerative Life-Support, Noah J. Langenfeld, Bruce Bugbee
Nitrification Rate Depends On Nitrogen Fertilizer Source In Root-Zones For Bioregenerative Life-Support, Noah J. Langenfeld, Bruce Bugbee
Utah Space Grant Consortium
Nitrification helps recycle nitrogen (N) in closed root-zones with multiple N inputs. We studied nitrification rates in peat moss soilless media adjusted to pH 6.5 to 7 and watered with nutrient solutions containing 9 mM N from ammonium nitrate, ammonium, nitrate, urea, or microbial biomass (lysed cells of the N-fixing bacteria Azotobacter vinelandii). We leached the media with nutrient solution every week for 150 days and measured the pH, electrical conductivity, and nitrate concentration. We measured ammonium in the peat moss at the end of the study using a potassium chloride extraction and quantified total N by combustion. Nitrification …
Estimating The Full Pressure Field Immediately Downstream From A Propeller Using Stereoscopic Piv, Nathan Welker, Daniel Maynes
Estimating The Full Pressure Field Immediately Downstream From A Propeller Using Stereoscopic Piv, Nathan Welker, Daniel Maynes
Utah Space Grant Consortium
Despite their relative importance in aerodynamic and turbulent flow measurements, pressure data has long been limited to time-mean fields made using tedious and intrusive pitot probe arrays. However, velocity-based measurements, such as particle image velocimetry (PIV), can be combined with the governing flow equations to derive high resolution pressure fields in a non-intrusive way. Using phase-locking and a multi-plane stereo-PIV approach, the pressure fields in the wake of an isolated propeller were measured using this method. The results were compared to data obtained from a traditional pitot probe. It was found that the pressure profile from the PIV approach was …
Expedited Cellular Uptake Of Hydrophobic Antioxidants For Oxidative Stress Mitigation Via F127 Micelle Encapsulation, Kyle Jackson, Kade Robison, David Britt, Yu Huang
Expedited Cellular Uptake Of Hydrophobic Antioxidants For Oxidative Stress Mitigation Via F127 Micelle Encapsulation, Kyle Jackson, Kade Robison, David Britt, Yu Huang
Utah Space Grant Consortium
Various hydrophobic antioxidants remain unexplored for the treatment of space radiation and oxidative stress due to their inability to enter the cell without a drug delivery vehicle. Here, we explore the Pluronic F127 drug delivery vehicle, known as a micelle, and examine cellular responses following antioxidant delivery and oxidative stress mitigation. We also investigate methods for producing antioxidant-loaded micelles and their potential suitability for astronauts, including the best ways they might be administered during space flight missions. This research paves the way for new antioxidants to be used to protect astronauts from diseases caused by space conditions such as radiation …
Earth Observation Satellite Data Reveals Correlations Between Temperature, Turbidity, And Chlorophyll-A In Utah Lake, Kaylee B. Tanner
Earth Observation Satellite Data Reveals Correlations Between Temperature, Turbidity, And Chlorophyll-A In Utah Lake, Kaylee B. Tanner
Utah Space Grant Consortium
No abstract provided.
Demonstration Of Self-Deploying And Self-Stabilizing Behaviors In Origami-Inspired Arrays, Katie Varela, Lydia Beazer, Larry L. Howell, Nathan S. Usevitch, Spencer P. Magleby
Demonstration Of Self-Deploying And Self-Stabilizing Behaviors In Origami-Inspired Arrays, Katie Varela, Lydia Beazer, Larry L. Howell, Nathan S. Usevitch, Spencer P. Magleby
Utah Space Grant Consortium
Although origami-inspired mechanisms are becoming more common in engineering, transitioning from a paper-based origami pattern to a deployable array requires many design decisions, including selecting a thickness accommodation technique, hinges/surrogate folds, deployment method, stability measures, damping process, etc. This work focuses on demonstrating deployment and stabilization techniques applied to Miura-Ori configurations, with the primary objective of achieving a self-deploying and self-stabilizing array that could be utilized as a reflectarray antenna or other deployable system for satellites. These arrays must be compact when stowed, yet deploy expansively, with minimal to no aid. Specifically, this work describes deployment techniques that can be …
Kirigami Pattern Development For Gossamer Reflectarray Antenna, Ivy Running, Carolina Wright, Robert J. Lang, Larry Howell, Spencer Magleby
Kirigami Pattern Development For Gossamer Reflectarray Antenna, Ivy Running, Carolina Wright, Robert J. Lang, Larry Howell, Spencer Magleby
Utah Space Grant Consortium
Gossamer arrays for satellites are large, thin deployable structures, and they are attractive for space applications because they can be folded and stowed compactly for transportation and be deployed to have large functional surface areas. Reflectarray (RF) antennas could potentially function well on gossamer structures because they can be mounted on thin membranes. However, the efficiency of RF antennas decreases with any deviations from a flat plane, including those induced by plastically deformed creases. The study of origami allows us to design stowage configurations that meet specific needs. In this case, origami patterns and principles are explored that enable a …
A Survey Of Model Fits To Brown Dwarf Spectra Through The L-T Sequence, Savanah Turner, Denise Stephens
A Survey Of Model Fits To Brown Dwarf Spectra Through The L-T Sequence, Savanah Turner, Denise Stephens
Utah Space Grant Consortium
Theoretical atmosphere models based on known physics and chemistry can be used as tools to interpret and understand our observations of brown dwarfs. We have fit archival near-infrared spectra of over 300 brown dwarfs with atmosphere models from the Sonora and Phoenix groups. Using the parameters of the best-fit models as estimates for the physical properties of the brown dwarfs in our sample, we have performed a survey of how brown dwarf atmospheres evolve with spectral type and temperature. We present the fit results and observed trends. We use these fit results to note where current atmosphere models are able …
Quantitative Analysis Of Terrestrial Caldera Shape And Applications In Planetary Geomorphology, Camille Cowan, Jani Radebaugh
Quantitative Analysis Of Terrestrial Caldera Shape And Applications In Planetary Geomorphology, Camille Cowan, Jani Radebaugh
Utah Space Grant Consortium
Volcanism on rocky planets and moons can yield valuable insights into their composition, evolution, and heat regime. This study creates a model to determine characteristics of extraterrestrial volcanoes based on imagery, one of the most abundant resources for studying other planetary bodies. We found that of 56 measured calderas, 61% were correctly classified into compositional categories based on shape alone. These results indicate that this model can be applied to calderas on other planets and moons to help constrain characteristics of their volcanism.
Target Position And Velocity Estimation Using Doppler Information From Wifi Signals, James Hyland, Todd K. Moon
Target Position And Velocity Estimation Using Doppler Information From Wifi Signals, James Hyland, Todd K. Moon
Utah Space Grant Consortium
RF signals reflected off of a moving target experience a Doppler shift determined by the speed of the target. This can be used for target tracking, which could be useful in a variety of settings, such as using a communication signal to track a satellite, or to determine the location of a person within the space station. Although these reflections are weak compared to the signal seen from a direct path, the Doppler components can still be extracted. By processing Doppler signals from multiple receivers, the position and velocity of a target moving in the vicinity of the system can …
The Role Of Monitoring The Partial Pressure Of Oxygen In Urine For Early Detection Of Acute Kidney Injury, Lars Lofgren, Kai Kück, Natalie Silverton
The Role Of Monitoring The Partial Pressure Of Oxygen In Urine For Early Detection Of Acute Kidney Injury, Lars Lofgren, Kai Kück, Natalie Silverton
Utah Space Grant Consortium
Acute kidney injury (AKI) is defined as an abrupt decrease in renal function due to structural injury. AKI has a large effect on critical care patients due to a relatively high occurrence and association with poor outcomes. Currently, the diagnostic tools that we have, serum creatinine and urine output, are delayed indicators of the presence of injury and simply capture the drop in renal function. However, there is evidence that renal hypoxia plays a role in the development of most forms of AKI. Furthermore, there is a correlation between the partial pressure of oxygen in urine (PuO2) and …
Reference Channel Optimization In Bistatic & Passive Radar, Matthew Finger
Reference Channel Optimization In Bistatic & Passive Radar, Matthew Finger
Utah Space Grant Consortium
The thesis will cover the first steps and attempts to create a small scale bistatic radar using a Pluto software defined radio.
Major Axes Of Variation In Tree Demography Across Global Forests, Melina De Souza Leite, Sean M. Mcmahon, Paulo Inácio Prado, Stuart J. Davies, Alexandre Adalardo De Oliveira, Hannes P. De Deurwaerder, Salomón Aguilar, Kristina J. Anderson-Teixeira, Nurfarah Aqilah, Norman A. Bourg, Warren Y. Brockelman, Nicolas Castaño, Chia-Hao Chang-Yang, Yu-Yun Chen, George Chuyong, Keith Clay, Álvaro Duque, Sisira Ediriweera, Corneille E. N. Ewango, Gregory Gilbert, I. A. U. N. Gunatilleke, C. V. S. Gunatilleke, Robert Howe, Walter Huaraca Huasco, Akira Itoh, Daniel J. Johnson, David Kenfack, Kamil Král, Yao Tze Leong, James A. Lutz, Jean-Remy Makana, Yadvinder Malhi, William J. Mcshea, Mohizah Mohamad, Musalmah Nasardin, Anuttara Nathalang, Geoffrey Parker, Renan Parmigiani, Rolando Pérez, Richard P. Phillips, Pavel Šamonil, I-Fang Sun, Sylvester Tan, Duncan Thomas, Jill Thompson, María Uriarte, Amy Wolf, Jess Zimmerman, Daniel Zuleta, Marco D. Visser, Lisa Hülsmann
Major Axes Of Variation In Tree Demography Across Global Forests, Melina De Souza Leite, Sean M. Mcmahon, Paulo Inácio Prado, Stuart J. Davies, Alexandre Adalardo De Oliveira, Hannes P. De Deurwaerder, Salomón Aguilar, Kristina J. Anderson-Teixeira, Nurfarah Aqilah, Norman A. Bourg, Warren Y. Brockelman, Nicolas Castaño, Chia-Hao Chang-Yang, Yu-Yun Chen, George Chuyong, Keith Clay, Álvaro Duque, Sisira Ediriweera, Corneille E. N. Ewango, Gregory Gilbert, I. A. U. N. Gunatilleke, C. V. S. Gunatilleke, Robert Howe, Walter Huaraca Huasco, Akira Itoh, Daniel J. Johnson, David Kenfack, Kamil Král, Yao Tze Leong, James A. Lutz, Jean-Remy Makana, Yadvinder Malhi, William J. Mcshea, Mohizah Mohamad, Musalmah Nasardin, Anuttara Nathalang, Geoffrey Parker, Renan Parmigiani, Rolando Pérez, Richard P. Phillips, Pavel Šamonil, I-Fang Sun, Sylvester Tan, Duncan Thomas, Jill Thompson, María Uriarte, Amy Wolf, Jess Zimmerman, Daniel Zuleta, Marco D. Visser, Lisa Hülsmann
Wildland Resources Faculty Publications
The future trajectory of global forests is closely intertwined with tree demography, and a major fundamental goal in ecology is to understand the key mechanisms governing spatio-temporal patterns in tree population dynamics. While previous research has made substantial progress in identifying the mechanisms individually, their relative importance among forests remains unclear mainly due to practical limitations. One approach to overcome these limitations is to group mechanisms according to their shared effects on the variability of tree vital rates and quantify patterns therein. We developed a conceptual and statistical framework (variance partitioning of Bayesian multilevel models) that attributes the variability in …
Water Banking As A Strategy For The Management And Conservation Of A Critical Resource: A Case Study From Tunisia's Medjerda River Basin (Mrb), Aymen Sawassi, Roula Khadra, Brian Crookston
Water Banking As A Strategy For The Management And Conservation Of A Critical Resource: A Case Study From Tunisia's Medjerda River Basin (Mrb), Aymen Sawassi, Roula Khadra, Brian Crookston
Civil and Environmental Engineering Faculty Publications
The increasingly adverse impacts of climate change (e.g., rainfall patterns, droughts, and floods), coupled with the ever-increasing water demands, are often translated into a contingent liability for water users' communities. Additional complexities arise due to competing priorities, water rights, and transboundary water sources. Therefore, conventional water management practices should shift toward more comprehensive and responsive integrative approaches, even for systems with limited data. Furthermore, water managers must prioritize dynamic and interactive management techniques for existing systems. One such management technique is water banking, which is the focus of this study. Herein, a dynamic interactive water allocation model, which encompasses the …
Calculations From On The Existence Of Periodic Traveling-Wave Solutions To Certain Systems Of Nonlinear, Dispersive Wave Equations, Jacob Daniels
Calculations From On The Existence Of Periodic Traveling-Wave Solutions To Certain Systems Of Nonlinear, Dispersive Wave Equations, Jacob Daniels
Mathematics and Statistics Student Research and Class Projects
In the field of nonlinear waves, particular interest is given to periodic traveling-wave solutions of nonlinear, dispersive wave equations. This thesis aims to determine the existence of periodic traveling-wave solutions for several systems of water wave equations. These systems are the Schr¨odinger KdV-KdV, Schr¨odinger BBM-BBM, Schr¨odinger KdV-BBM, and Schr¨odinger BBM-KdV systems, and the abcd-system. In particular, it is shown that periodic traveling-wave solutions exist and are explicitly given in terms of cnoidal, the Jacobi elliptic function. Certain solitary-wave solutions are also established as a limiting case of the periodic traveling-wave solutions, that is, as the elliptic modulus approaches one.
Assessing The Effects Of Cold Storage Regimes Of North American Bombus Gynes, Thuy Tien T. Lindsay, Marcia M. Hagen, Joyce N. Knoblett, Joseph P. Rinehart, Karen M. Kapheim, James P. Strange
Assessing The Effects Of Cold Storage Regimes Of North American Bombus Gynes, Thuy Tien T. Lindsay, Marcia M. Hagen, Joyce N. Knoblett, Joseph P. Rinehart, Karen M. Kapheim, James P. Strange
Biology Faculty Publications
Bumble bees are the primary commercial pollinators for greenhouse-grown crops and managing them requires insight into the Bombus life cycle. However, some aspects of the life cycle are not fully understood. Once mated, adult Bombus gynes can be stored for a short term at a constant low temperature (CLT). However, survival rates for some species are low during CLT, particularly when storage periods exceed a month. To address this, we tested the hypothesis that Bombus gynes stored in a fluctuating thermal regime (FTR) have increased survival compared to gynes stored in CLT. Specifically, the FTR had a baseline temperature of …
Quantifying Time Spent Outdoors: A Versatile Method Using Any Type Of Global Positioning System (Gps) And Accelerometer Devices, Wei Liu, Timothy Chambers, Kimberly A. Clevenger, Karin A. Pfeiffer, Zachary Rzotkiewicz, Hyunseo Park, Amber L. Pearson
Quantifying Time Spent Outdoors: A Versatile Method Using Any Type Of Global Positioning System (Gps) And Accelerometer Devices, Wei Liu, Timothy Chambers, Kimberly A. Clevenger, Karin A. Pfeiffer, Zachary Rzotkiewicz, Hyunseo Park, Amber L. Pearson
Kinesiology and Health Science Faculty Publications
Spending time outdoors is associated with increased time spent in physical activity, lower chronic disease risk, and wellbeing. Many studies rely on self-reported measures, which are prone to recall bias. Other methods rely on features and functions only available in some GPS devices. Thus, a reliable and versatile method to objectively quantify time spent outdoors is needed. This study sought to develop a versatile method to classify indoor and outdoor (I/O) GPS data that can be widely applied using most types of GPS and accelerometer devices. To develop and test the method, five university students wore an accelerometer (ActiGraph wGT3X-BT) …
Utah State University Commencement, 2024 - Moab Campus, Utah State University
Utah State University Commencement, 2024 - Moab Campus, Utah State University
Commencement Programs
2024 Commencement Ceremony for the Moab campus of Utah State University.
Utah State University Commencement, 2024 - Eastern Campus, Utah State University
Utah State University Commencement, 2024 - Eastern Campus, Utah State University
Commencement Programs
2024 Commencement Ceremony for the Eastern campus of Utah State University.
Utah State University Commencement, 2024 - Tooele Campus, Utah State University
Utah State University Commencement, 2024 - Tooele Campus, Utah State University
Commencement Programs
2024 Commencement Ceremony for the Tooele campus of Utah State University.
Utah State University Commencement, 2024 - Uintah Basin Campus, Utah State University
Utah State University Commencement, 2024 - Uintah Basin Campus, Utah State University
Commencement Programs
2024 Commencement Ceremony for the Uintah Basin campus of Utah State University.
Utah State University Commencement, 2024 - Main Campus, Utah State University
Utah State University Commencement, 2024 - Main Campus, Utah State University
Commencement Programs
2024 Commencement Ceremony for the Main Campus of Utah State University.
Utah State University Commencement, 2024 - Brigham City, Kaysville & Tremonton Campuses, Utah State University
Utah State University Commencement, 2024 - Brigham City, Kaysville & Tremonton Campuses, Utah State University
Commencement Programs
2024 Commencement Ceremony for the Brigham City, Kaysville & Tremonton Campuses of Utah State University.
Utah State University Commencement, 2024 - Southwest Campus, Utah State University
Utah State University Commencement, 2024 - Southwest Campus, Utah State University
Commencement Programs
2024 Commencement Ceremony for the Southwest campus of Utah State University.
Utah State University Commencement, 2024 - Blanding Campus, Utah State University
Utah State University Commencement, 2024 - Blanding Campus, Utah State University
Commencement Programs
2024 Commencement Ceremony for the Blanding campus of Utah State University.
Analyzing Atmospheric Gravity Waves Over Antarctica And Visualizing Machine Learning Data, Anastasia N. Brown
Analyzing Atmospheric Gravity Waves Over Antarctica And Visualizing Machine Learning Data, Anastasia N. Brown
Physics Capstone Projects
In an effort to streamline the identification of "clean" windows of airglow images in all sky imager data for the ANGWIN experiment, we have developed a Light Gradient Boosted Machine (LightGBM) learning algorithm that sorts "clean" (marked as 0) wave images from "obscured" (marked as 1) images. These "clean" windows are then processed and undergo FFT-spectrum analysis. We have already successfully created LightGBM models that accurately sort through images taken at the Davis, McMurdo, and Halley research stations in Antarctica. Imager data from the Davis and McMurdo station has been fully processed from the years 2012 to 2022 with clean …
Preparing Students For Adulthood: Comparing The Experiences Of Degree And Non-Degree Seeking Graduates, Lacee R. Boschetto, Brian K. Warnick
Preparing Students For Adulthood: Comparing The Experiences Of Degree And Non-Degree Seeking Graduates, Lacee R. Boschetto, Brian K. Warnick
Applied Sciences, Technology and Education Faculty Publications
The role of secondary education is critical to preparing graduates for adulthood. This study explored the transition experiences of high school graduates and factors that impacted their preparation for adulthood. This descriptive study focused on the experiences of degree and non-degree-seeking graduates. Surveys were distributed to students enrolled in a general education course at a state university and marketing research participants not enrolled in post-secondary programs. The survey sought to identify overall preparedness, responsibilities deemed necessary to teach in high school, and influence factors that prepared them for adulthood. The overall findings displayed that graduates seeking degrees felt more prepared …