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Articles 28711 - 28740 of 294413

Full-Text Articles in Physical Sciences and Mathematics

Identifying Secondary Metabolites In Corals Of The Order Corallimorpharia For Novel Medicinal Use, Dave Huish, Jane Lee May 2024

Identifying Secondary Metabolites In Corals Of The Order Corallimorpharia For Novel Medicinal Use, Dave Huish, Jane Lee

Utah Space Grant Consortium

Medicinal and bioactive compounds have been found in various species of corals and are currently being used for, but not limited to, anti-inflammatory, cytotoxic/chemotherapy, antimicrobial, antivirus, and antifouling. Currently, acquiring compounds and derivatives is limited by naturally occurring resources. This project is investigating corals from the order Corallimorpharia that are known rapid reproducers and potentially invasive. They demonstrate many of the same attributes as corals that have been studied suggesting that they have similar compounds. The specific coral of interest is Rhodactis howesii. Samples have been obtained, DNA has been isolated, and their genomes are in the process of being …

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Chemical Synthesis Of Aerogel Fabric Under Standard Lab Conditions, Antonio Ruiz, Cristina Kinosian, Lane Law, John Flood May 2024

Chemical Synthesis Of Aerogel Fabric Under Standard Lab Conditions, Antonio Ruiz, Cristina Kinosian, Lane Law, John Flood

Utah Space Grant Consortium

Aerogels are a fascinating material that function as great insulators. Nasa has partnered with Aspen Aerogels to produce a commercially viable product that aims to tackle a variety of problems such as space shuttle insulation, space particle collection, thermal safety, and cryogenic applications. The main objective of our project is to reproduce an aerogel blanket using standard lab conditions and chemicals. We will be producing the blanket using the silica gel process. We will compare properties of durability, cost, and thermal conductivity. We plan to pinpoint a procedure that provides the most cost effective, durable, and thermally conductive material under …

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Historical El Nino/La Nina Patterns In Slc, Sea, And La, Eric Wykstra, Jonathan Barnes May 2024

Historical El Nino/La Nina Patterns In Slc, Sea, And La, Eric Wykstra, Jonathan Barnes

Utah Space Grant Consortium

Temperature and precipitation patterns vary across the United States. Different environmental influences can affect these patterns in predictable ways. El Nino and La Nina are two such environmental influences. It is a temperature reading of a section of the ocean that reads 0.5 Celsius above or below the average ocean temperature. In this project we follow the temperatures and levels of precipitation in three cities: Salt Lake City, Seattle, and Los Angeles. We then compare them to the temperatures of El Nino and La Nina to see if there are correlations between the data.

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Molecular Dynamics Simulations For Molten Salt Mixtures, Bryant Jones, Shane Schaugaard, Maggie Wu, Ashely Littlefield May 2024

Molecular Dynamics Simulations For Molten Salt Mixtures, Bryant Jones, Shane Schaugaard, Maggie Wu, Ashely Littlefield

Utah Space Grant Consortium

No abstract provided.

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The First Snap Surface Brightness Fluctuation Distances, Mikaela Cowles, Joseph B. Jensen, Brent Tully, John P. Blakeslee, Ehsan Kourkchi May 2024

The First Snap Surface Brightness Fluctuation Distances, Mikaela Cowles, Joseph B. Jensen, Brent Tully, John P. Blakeslee, Ehsan Kourkchi

Utah Space Grant Consortium

We have successfully acquired F110W (J-band) images of 68 massive elliptical galaxies in clusters and groups out to 80 Mpc by taking advantage of the efficient Hubble Space Telescope SNAP observing mode. We used the Surface Brightness Fluctuation (SBF) technique to measure distances to 44 of the galaxies so far with a typical uncertainty of ~5% in distance by implementing a new Python-based pipeline to simplify and automate the SBF analysis procedure. This new SNAP sample doubles the total number of IR SBF distances to galaxies beyond 50 Mpc. The new distances will allow for more accurate determination of the …

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Artemia In Space, Holbrook Hawkes, Elizabeth Blackburn, Bonnie K. Baxter May 2024

Artemia In Space, Holbrook Hawkes, Elizabeth Blackburn, Bonnie K. Baxter

Utah Space Grant Consortium

The panspermia hypothesis poses that life originated in space. To test this hypothesis, a model organism capable of withstanding the extreme conditions of space must be used. The brine shrimp genus Artemia represents species of extremophilic zooplankton with adaptations to survive extreme temperatures (-273˚°C to 90˚°C), hydrogen sulfide-reducing environments, HZE particles, oxidation, desiccation, ion exposure, electromagnetic radiation, and anoxia (Skoultchi and Morowitz, 1964; Clegg, 1978; van Stappen, 1996, 2002; Willsie and Clegg, 2001; Clegg and Trotman, 2002; MacRae, 2016). Artemia are so hardy in part due to their ability to produce oviparous encysted embryos instead of live nauplii that can …

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Ecological Dynamics Of The Hypersaline Great Salt Lake North Arm, Amanda Lee, Alex Phillips, Bonnie Baxter, Amy Schmid May 2024

Ecological Dynamics Of The Hypersaline Great Salt Lake North Arm, Amanda Lee, Alex Phillips, Bonnie Baxter, Amy Schmid

Utah Space Grant Consortium

Great Salt Lake (GSL) is home to a massive variety of microorganisms and these populations will aid in understanding the ecosystem. The Union Pacific’s railroad causeway divided GSL into two distinct sections, the green South Arm and pink North Arm, and each have nurtured two accordingly distinctive ecosystems. Breaches periodically opened in the causeway allow the waters to mix and provide opportunity for the microbial communities of the two arms to intermingle. This project focuses on procuring a picture of the North Arm’s microbial diversity and the extent that it adapts to new environments over the four seasons, as well …

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White Light Observations Of The Total Solar Eclipse, Maxwell Lynch, Julia Kamenetzky May 2024

White Light Observations Of The Total Solar Eclipse, Maxwell Lynch, Julia Kamenetzky

Utah Space Grant Consortium

This year, we have had the opportunity to see two total solar eclipses. I helped create training materials for volunteer scientists who took photographs of these eclipses. Our group worked with the Dynamic Eclipse Broadcast Initiative, which has organized groups for this project across North America. My role was to work with the DEB team to write instructions for our systems, and then to observe both eclipses.

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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 May 2024

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, …

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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 May 2024

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.

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Extracting Meanline Modeling Parameters For Radial Turbomachinery From Cfd, Jason Metten, Dallan Trentman May 2024

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 …

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Precise Impulse Design For Hybrid Rockets Using Machine-Learning Informed Digital Throttle Input, Eric Larsen, Stephen Whitmore, Som Dutta May 2024

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 …

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Nitrification Rate Depends On Nitrogen Fertilizer Source In Root-Zones For Bioregenerative Life-Support, Noah J. Langenfeld, Bruce Bugbee May 2024

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 …

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Estimating The Full Pressure Field Immediately Downstream From A Propeller Using Stereoscopic Piv, Nathan Welker, Daniel Maynes May 2024

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 …

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Expedited Cellular Uptake Of Hydrophobic Antioxidants For Oxidative Stress Mitigation Via F127 Micelle Encapsulation, Kyle Jackson, Kade Robison, David Britt, Yu Huang May 2024

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 …

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Earth Observation Satellite Data Reveals Correlations Between Temperature, Turbidity, And Chlorophyll-A In Utah Lake, Kaylee B. Tanner May 2024

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.

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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 May 2024

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 …

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Kirigami Pattern Development For Gossamer Reflectarray Antenna, Ivy Running, Carolina Wright, Robert J. Lang, Larry Howell, Spencer Magleby May 2024

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 …

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A Survey Of Model Fits To Brown Dwarf Spectra Through The L-T Sequence, Savanah Turner, Denise Stephens May 2024

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 …

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Quantitative Analysis Of Terrestrial Caldera Shape And Applications In Planetary Geomorphology, Camille Cowan, Jani Radebaugh May 2024

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.

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Target Position And Velocity Estimation Using Doppler Information From Wifi Signals, James Hyland, Todd K. Moon May 2024

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 …

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The Role Of Monitoring The Partial Pressure Of Oxygen In Urine For Early Detection Of Acute Kidney Injury, Lars Lofgren, Kai Kück, Natalie Silverton May 2024

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 …

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Reference Channel Optimization In Bistatic & Passive Radar, Matthew Finger May 2024

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.

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Artificial Intelligence And Music: Analysis Of Music Generation Techniques Via Deep Learning And The Implications Of Ai In The Music Industry, David Bryce May 2024

Artificial Intelligence And Music: Analysis Of Music Generation Techniques Via Deep Learning And The Implications Of Ai In The Music Industry, David Bryce

Honors Projects in Data Science

The use of artificial intelligence (AI) is quickly gaining relevancy in creative fields, and its emergence into the music industry comes with many unique implications. This paper examines the technical processes of creating music with AI and machine learning, the relationship between music and emotion, and finally the implications and ethical considerations for AI generated music in creative industries. As part of this project, a generative deep learning model (Music Variational Autoencoder) is explored and applied to generate music using a pre-trained training set of piano rolls. The AI reconstructions are based on self-made 4 measure electronic instrumental tracks. 46 …

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The Rubidium Magneto-Optical Trap: Designing A Robust System For Measurement & Control, Thomas Melody May 2024

The Rubidium Magneto-Optical Trap: Designing A Robust System For Measurement & Control, Thomas Melody

Honors Program Theses and Projects

This thesis is a culmination of our efforts to construct a robust and flexible opto-mechanical system to fully deliver and control all of the parameters related to the required laser wavelength, polarization, power, beam size, and directionality for both the pump and the re-pump laser beams, delivered from two different lasers, necessary for neutral-atom laser trapping and cooling. This is an extension of the neutral Rubidium Magneto-Optical Trap (MOT) at BSU which afford a macroscopic scale collection of cold atoms where the effective governing laws of physics are quantum in nature rather than classical. My predecessors had done work on …

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The Ring-Closing Reaction Of Cyclopentadiene Probed With Ultrafast X‑Ray Scattering, Lisa Huang, Lauren Bertram, Lingyu Ma, Nathan Goff, Stuart W. Crane, Asami Odate, Thomas Northey, Andrés Moreno Carrascosa, Mats Simmermacher, Sri Bhavya Muvva, Joseph D. Geiser, Matthew J. Lueckheide, Zane Phelps, Mengning Liang, Xinxin Cheng, Ruaridh Forbes, Joseph S. Robinson, Matthew J. Hayes, Felix Allum, Alice E. Green, Kenneth Lopata, Artem Rudenko, Thomas J. A. Wolf, Martin Centurion, Daniel Rolles, Michael P. Minitti, Adam Kirrander, Peter M. Weber May 2024

The Ring-Closing Reaction Of Cyclopentadiene Probed With Ultrafast X‑Ray Scattering, Lisa Huang, Lauren Bertram, Lingyu Ma, Nathan Goff, Stuart W. Crane, Asami Odate, Thomas Northey, Andrés Moreno Carrascosa, Mats Simmermacher, Sri Bhavya Muvva, Joseph D. Geiser, Matthew J. Lueckheide, Zane Phelps, Mengning Liang, Xinxin Cheng, Ruaridh Forbes, Joseph S. Robinson, Matthew J. Hayes, Felix Allum, Alice E. Green, Kenneth Lopata, Artem Rudenko, Thomas J. A. Wolf, Martin Centurion, Daniel Rolles, Michael P. Minitti, Adam Kirrander, Peter M. Weber

Martin Centurion Publications

The dynamics of cyclopentadiene (CP) following optical excitation at 243 nm was investigated by time-resolved pump−probe X-ray scattering using 16.2 keV X-rays at the Linac Coherent Light Source (LCLS). We present the first ultrafast structural evidence that the reaction leads directly to the formation of bicyclo[2.1.0]pentene (BP), a strained molecule with three- and four-membered rings. The bicyclic compound decays via a thermal backreaction to the vibrationally hot CP with a time constant of 21 ± 3 ps. A minor channel leads to ring-opened structures on a subpicosecond time scale.

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Current Small-Scale Cmb Constraints To Axionlike Early Dark Energy, Tristan L. Smith, V. Poulin May 2024

Current Small-Scale Cmb Constraints To Axionlike Early Dark Energy, Tristan L. Smith, V. Poulin

Physics & Astronomy Faculty Works

The south pole telescope (SPT) SPT-3G 2018 cosmic microwave background (CMB) data set (temperature and polarization) is used to place constraints on an axionlike model of early dark energy (EDE). These data do not favor axionlike EDE and place an upper limit on the maximum fraction of the total energy density 𝑓EDE < 0.172 (at the 95% confidence level, C.L.). This is in contrast with Atacama Cosmology telescope’s (ACT) fourth data release (DR4) which gives 𝑓EDE = 0.15⁢0 +0.050/-0.078. When combining CMB measurements with measurements of the baryon acoustic oscillations and luminosity distance to type Ia supernovae, we show that the tension with the S⁢𝐻₀ ⁡ES measurement of the Hubble parameter goes up from 2.6⁢𝜎 with 𝑃⁢𝑙⁢𝑎⁢𝑛⁢𝑐⁢𝑘 to 2.9⁢𝜎 with 𝑃⁢𝑙⁢𝑎⁢𝑛⁢𝑐⁢𝑘+SPT−3⁢G 2018. …

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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 May 2024

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 …

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Research Project Review: Human-Computer Interactions, Kylie E. Garcia May 2024

Research Project Review: Human-Computer Interactions, Kylie E. Garcia

The Agora

A review of a body of research conducted by Dr. Gain Park, an assistant professor in the Department of Journalism and Media Studies at New Mexico State University. This review contains a summary of Dr. Park's research on human-computer interactions, commentary on its contributions and significance, as well as insights from Dr. Park.

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Toxic Chocolate: An Investigation Of Heavy Metal Concentrations In Chocolate Products, Meredith E. Hoff May 2024

Toxic Chocolate: An Investigation Of Heavy Metal Concentrations In Chocolate Products, Meredith E. Hoff

Student Scholarship

Many news organizations and scientific journals have recently reported high concentrations of lead and cadmium in chocolate products. The consumption of lead, cadmium, and other toxic metals can lead to numerous health impacts and impair development in children.1,2 Previous studies have specifically focused on the quantification of lead and cadmium in mainstream chocolate products, neglecting small businesses and the quantification of other heavy metals. This study addresses this disparity by analyzing the concentrations of lead, cadmium, barium, strontium, thallium, and mercury in lesser-known chocolate products from Castronovo Chocolate, Meridian Cacao Co., and Lidl. Two ICP-OES instruments and a direct mercury …

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