151 Works

Does Competition Drive Community Structure? An Analysis of Grasshopper Competition

H. Joseph Lachowski
lnterspecific competition has been broadly defined as a negative-negative relationship between species that share a limiting resource. The impact of competition on ecological communities is a widely debated topic (Schoener 1982). Thus community structure is very complex and, in addition to competition, can be influenced by many factors, including climate, disease, parasites, and predation (Hairston et al. 1960; Stower & Greathead 1969; Wiens 1977). The importance of competition depends upon the importance of other processes...


Alan Freer
When reading a poem, one often wonders what prompts the poet to use a certain word order, to break the line at a specific point, or to even use that particular topic as the subject of the poem. Although there are those literary critics who assert that a poem should be read entirely out of the context, there is much to be gained by looking at the poem with the additional background information about the...

The Limits to Change in East Europe

Elesha Kay Fetrow
What does every European need today? "Provided peace and security are guaranteed, every European seeks to live in an open and prosperous society, in a society striving to put an end to injustice and capable of offering every individual the opportunity of making the most of his or her abilities while serving universal human ideals."

Comparison of Laryngographic Waveforms of an Adult and Child

Elaine Hicken
The ability to accurately identify and differentially diagnose voice disorders is an important concern for the speech-language pathologist. This need has resulted in the development of methods which focus on identifying "objective, reliable, valid procedures for assessing voice disorders" (Costello, 1985). Several methods that allow direct observation of the laryngeal mechanism are invasive and time consuming. A method that is noninvasive and that provides valuable information about the vocal fold movement pattern is needed for...

Opioid Prevention for Rural Utah Youth through PROSPER

Stacey MacArthur
The Opioid Prevention for Rural Utah Youth through PROSPER program will serve 6th grade students and their families in Wayne, Emery, and San Juan counties. Participants will benefit from the research-based PROSPER program that delivers both community and school-based programming to strengthen youth and their families and increase their strengths to prevent opioid use.

Increasing the Efficacy and Integration of a Biocontrol Tool for Managing Canada Thistle in the Intermountain West

Steve Young
The goal is to further refine our understanding of how to initiate and enchance P. punctiformis systemic infection and integrate this knowledge with other weed management tactics to improve IWM approaches for Canada thistle control in the Intermountain West.

Coming Up: The USU Empowering Teaching Excellence Conference

A preview of the topics to be addressed in the upcoming Empowering Teaching Excellence conference at Utah State University, with proceedings to appear in the upcoming Spring 2020 issue of the journal.

A Universal Mechanism for N2 Binding to and Differing Reactivity of the E4(4H) State of Mo-, V-, and Fe-Nitrogenases

Derek Franklin Harris
As a basic building block in many biological molecules, the element nitrogen (N) is essential for life. Dinitrogen (N2) is abundant in Earth’s atmosphere, but this form is biologically unavailable. To be biologically available, N2 must undergo a reduction reaction to the fixed form, ammonia (NH3). The industrial Haber-Bosch process, which accounts for approximately 50% of the worlds fixed nitrogen, uses energy from fossil fuels to achieve high pressures and temperatures to catalyze the reaction....

Investigation of the Molecular Determinants and Extrinsic Factors that Regulate PRMT Product Specificity

Tamar B. Cáceres
Protein arginine methylation is an important modification of proteins, involved in many cellular processes. Some examples are transcription, RNA editing, cellular communication, DNA repair, viral replication and chromatin remodeling. In recent years, the significance of protein arginine methyltransferases (PRMTs) in human diseases has been increasingly studied, especially in cardiovascular disease and cancer. Although the importance of these enzymes is recognized, the understanding of how exactly PRMTs function is still limited. Very little information is available...

Query AutoAwesome

Chetna Suryavanshi
This research investigates how to improve legacy queries. Legacy queries are queries that programmers have coded and are used in applications. A database application typically has tens to hundreds of such queries. One way to improve legacy queries is to add new, interesting queries that are similar to or based on the set of queries. We propose Query AutoAwesome, a tool to generate new queries from legacy queries. The Query AutoAwesome philosophy is taken from...

Optimization of Biogas Production by Use of a Microbially Enhanced Inoculum

Anna Doloman
A renewable energy source, biogas, comprises of methane (80%) and carbon dioxide (15%), and is a great alternative to the conventional fossil-based fuels, such as coal, gas and oil. Biogas is created during anaerobic biological digestion of waste materials, such as landfill material, animal manure, wastewater, algal biomass, industrial organic waste etc. A biogas potential from organic waste in the United States is estimated at about 9 million tons per year and technology allows capture...

The Red Front Door, A Memoir

Camila B. Sanabria
This is a creative thesis that contains two components: 1) a critical introduction that defends the representation of mixed-status families and deportation narratives, and 2) a memoir that depicts my experience with deportation and as a member of a mixed-status family. The second component of this thesis will consist of the first four chapters of my memoir, with the remaining chapters to be completed post-graduation. These chapters take place the years before my parents’ deportation...

Isentropic Efficiency and Theoretical Analysis of the Planetary Rotor Expander

Joseph L. James
Expanders allow pressurized fluids to undergo a pressure decrease in a controlled environment via volumetric growth to extract fluid energy. There are many types of expanders, and the objective of this thesis is to model the efficiencies of the planetary rotor expander (PRE), a century-old design undeveloped due to insufficient manufacturing capabilities (until recently). Geometric relationships are derived and mathematical models are generated to determine the efficiency of the PRE as a function of design...

How Virtual Reality Impacts the Landscape Architecture Design Process at Various Scales

Drew M. Hill
In the field of landscape architecture, the use of virtual reality (VR) is increasing as a tool for visualization and presentation in the late stages of the design process. Many of the benefits that make VR valuable in the later stages of the design process suggest that VR may also be valuable when used in earlier stages such as analysis and concept development. However, existing research does not provide a detailed study of design within...

Control and Stability of Upper Stage Launch Vehicle With Hybrid Arc-Ignition Attitude Control System

Steven Russell Bennett
The Utah State University Propulsion Research Laboratory (USUPRL) has recently made significant developments in the area of hybrid rocket systems. This type of propulsion system incorporates a solid fuel and a gas or liquid oxidizer. Hybrid rocket systems are known for their inherent safety, reliability, and restart capability. Over the last several years, the USUPRL has successfully built and tested a hybrid rocket system comprising acrylonitrile butadiene styrene (ABS) plastic and gaseous oxygen (GOX). The...

Questioning Questions: A Grounded Theory Investigation of Teacher Questioning in Seminary for the Church of Jesus Christ

Zachary R. Horton
This study investigated teacher questioning practices and rationales in released-time seminary classes for The Church of Jesus Christ of Latter-day Saints (the Church of Jesus Christ or the Church). Seminary teachers focus their questions on helping students learn course principles, value those principles, and apply them to their lives by discussing potential actions that can be taken by students outside of class. The purpose of this study was to observe and interview teachers relative to...

Linkage of Climate Diagnostics in Predictions for Crop Production: Cold Impacts in Taiwan and Thailand

Parichart Promchote
This research presents three case studies of low temperature anomalies that occurred during the winter–spring seasons and their influence on extreme events and crop production. We investigate causes and effects of each climate event and developed prediction methods for crops based on the climate diagnostic information. The first study diagnosed the driven environmental-factors, including climate pattern, climate change, soils moisture, and sea level height, associated with the 2011 great flood in Thailand and resulting total...

Spectral, Energy and Computation Efficiency in Future 5G Wireless Networks

Haijian Sun
Wireless technology has revolutionized the way people communicate. From first generation, or 1G, in the 1980s to current, largely deployed 4G in the 2010s, we have witnessed not only a technological leap, but also the reformation of associated applications. It is expected that 5G will become commercially available in 2020. 5G is driven by ever-increasing demands for high mobile traffic, low transmission delay, and massive numbers of connected devices. Today, with the popularity of smart...

Feature Selection and Analysis for Standard Machine Learning Classification of Audio Beehive Samples

Chelsi Gupta
The beekeepers need to inspect their hives regularly in order to protect them from various stressors. Manual inspection of hives require a lot of time and effort. Hence, many researchers have started using electronic beehive monitoring (EBM) systems to collect critical information from beehives, so as to alert the beekeepers of possible threats to the hive. EBM collects information by applying multiple sensors into the hive. The sensors collect information in the form of video,...

Social Media Use During Crisis Events: A Mixed-Method Analysis of Information Sources and Their Trustworthiness

Apoorva Chauhan
This dissertation consists of three studies that examine online communications during crisis events. The first study identified and examined the information sources that provided official information online during the 2014 Carlton Complex Wildfire. Specifically, after the wildfire, a set of webpages and social media accounts were discovered that were named after the wildfire—called Crisis Named Resources (or CNRs). CNRs shared the highest percentage of wildfire-relevant information. Because CNRs are named after a crisis event, they...

Investigation of Graphene Interconnections for Multifunctional Reconfigurable Antenna Beam Steering

Joshua R. Perkins
In high frequency, high-performance wireless communications, direct line of sight antennas are common. The issue with the line of sight antennas is the need to redirect the physical antenna to achieve the best possible reception. Classical redirections are done by mechanical movements: hand tuning and motors. Our multi-functional re-configurable antenna (MRA) concept allows for electrical and non-mechanical antenna reorientation. This work investigates two important concepts in the development and enhancement of future MRA devices: special,...

Use of Landsat Imagery and Geographical Information Systems in the Assessment of Rangeland Cover and Wildlife Habitat

Mary Hunnicutt
The first chapter of this thesis reviews applications of satellite remote sensing and geographical information systems (GIS) in wildlife studies. The simpler uses of remote sensing are for habitat mapping, often using satellite imagery classified for other natural resources. More sophisticated applications incorporate remotely sensed data into a GIS for the digital manipulation of data planes. The most advanced applications are those which use remote sensing and GIS in models predicting habitat quality or population...

The History of Cokeville, Wyoming

Errol Jack Lloyd
Cokeville, Wyoming, is situated at the confluence of the Bear River and Smiths Fork valleys in southwestern Wyoming. Settled in 1874, the Cokeville area has experienced much the same political, economic, and social developments typical of other small rural towns in the western United States; but it is unlike neighboring settlements in that it was not dominated by the Church of Jesus Christ of Latter-day Saints during its early growth. Depending upon an agricultural economic...

Growth and Water Relations of Native Wheatgrass Populations

Brian P. Bell
Screening populations for development into released plant materials can be done inexpensively and in a timely manner. A common approach has been to quantify the amount of shoot dry mass produced as a surrogate for competitiveness. Besides dry mass production , other morphological characteristics have been employed , but physiological parameters have received less emphasis. Dry mass production may be an important characteristic, but identifying the traits responsible can be just as imperative . Populations...

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