Digital Commons Network^™

Periodic Bouncing Modes For Two Uniformly Magnetized Spheres. I. Trajectories, Boyd F. Edwards, Bo A. Johnson, John M. Edwards

All Physics Faculty Publications

We consider a uniformly magnetized sphere that moves without friction in a plane in response to the field of a second, identical, fixed sphere, making elastic hard-sphere collisions with this sphere. We seek periodic solutions to the associated nonlinear equations of motion. We find closed-form mathematical solutions for small-amplitude modes and use these to characterize and validate our large-amplitude modes, which we find numerically. Our Runge-Kutta integration approach allows us to find 1243 distinct periodic modes with the free sphere located initially at its stable equilibrium position. Each of these modes bifurcates from the finite-amplitude radial bouncing mode with infinitesimal-amplitude …

Can Aromaticity Be A Kinetic Trap? Example Of Mechanically Interlocked Aromatic [2-5]Catenanes Built From Cyclo[18]Carbon, Nikita Fedik, Maksim Kulichenko, Dmitriy Steglenko, Alexander I. Boldyrev

Chemistry and Biochemistry Faculty Publications

The unusual stability of cyclo[18]carbon arising from its aromaticity might be used to provide the kinetic trapping needed in the design of interlocked systems. The kinetic barrier separating the interlocked rings and the chemically bonded complex is about 30 kcal mol−1. In addition, the rings can slide freely, which is a promising property for the design of molecular gears and motors.

Dominant Negative Effects By Inactive Spa47 Mutants Inhibit T3ss Function And Shigella Virulence, Jamie L. Burgess, Heather B. Case, R. Alan Burgess, Nicholas E. Dickenson

Chemistry and Biochemistry Faculty Publications

Type three secretion systems (T3SS) are complex nano-machines that evolved to inject bacterial effector proteins directly into the cytoplasm of eukaryotic cells. Many high-priority human pathogens rely on one or more T3SSs to cause disease and evade host immune responses, underscoring the need to better understand the mechanisms through which T3SSs function and their role(s) in supporting pathogen virulence. We recently identified the Shigella protein Spa47 as an oligomerization-activated T3SS ATPase that fuels the T3SS and supports overall Shigella virulence. Here, we provide both in vitro and in vivo characterization of Spa47 oligomerization and activation in the presence and absence …

Periodic Bouncing Modes For Two Uniformly Magnetized Spheres. Ii. Scaling, Boyd F. Edwards, Bo A. Johnson, John M. Edwards

All Physics Faculty Publications

A uniformly magnetized sphere moves without friction in a plane in response to the field of a second, identical, fixed sphere and makes elastic hard-sphere collisions with this sphere. Numerical simulations of the threshold energies and periods of periodic finite-amplitude nonlinear bouncing modes agree with small-amplitude closed-form mathematical results, which are used to identify scaling parameters that govern the entire amplitude range, including power-law scaling at large amplitudes. Scaling parameters are combinations of the bouncing number, the rocking number, the phase, and numerical factors. Discontinuities in the scaling functions are found when viewing the threshold energy and period as separate …

Arbitrarily High-Order Unconditionally Energy Stable Schemes For Thermodynamically Consistent Gradient Flow Models, Yuezheng Gong, Jia Zhao, Qi Wang

Mathematics and Statistics Faculty Publications

We present a systematic approach to developing arbitrarily high-order, unconditionally energy stable numerical schemes for thermodynamically consistent gradient flow models that satisfy energy dissipation laws. Utilizing the energy quadratization method, we formulate the gradient flow model into an equivalent form with a corresponding quadratic free energy functional. Based on the equivalent form with a quadratic energy, we propose two classes of energy stable numerical approximations. In the first approach, we use a prediction-correction strategy to improve the accuracy of linear numerical schemes. In the second approach, we adopt the Gaussian collocation method to discretize the equivalent form with a quadratic …

Innovative Identification Of Substance Use Predictors: Machine Learning In A National Sample Of Mexican Children, Alejandro L. Vázquez, Melanie M. Domenech Rodríguez, Tyson S. Barrett, Sarah E. Schwartz [email protected], Nancy G. Amador Buenabad, Marycarmen N. Bustos Gamiño, María De Lourdes Gutiérrez López, Jorge A. Villatoro Velázquez

Psychology Faculty Publications

Machine learning provides a method of identifying factors that discriminate between substance users and non-users potentially improving our ability to match need with available prevention services within context with limited resources. Our aim was to utilize machine learning to identify high impact factors that best discriminate between substance users and non-users among a national sample (N = 52,171) of Mexican children (i.e., 5th, 6th grade; Mage = 10.40, SDage = 0.82). Participants reported information on individual factors (e.g., gender, grade, religiosity, sensation seeking, self-esteem, perceived risk of substance use), socioecological factors (e.g., neighborhood quality, community type, peer influences, parenting), and …

Engineering Students To Represent Usu At Women In Engineering Conference, Usu College Of Engineering

College of Engineering News

Jan 15, 2020 — Utah State University undergraduate student Morgan Bishop and PhD student Lori Caldwell were selected as finalists for the Women in Engineering Local Collegiate Competition to be held in Salt Lake City, Feb. 7-8. Both Bishop and Caldwell will be recognized as outstanding contributors to engineering at the conference. Bishop is in her final semester at USU, earning a bachelor’s degree in biological engineering. Caldwell earned a bachelor’s and master’s degree in biological engineering from USU and is now in the second year of her PhD program under the direction of Dr. Angela Minichiello, assistant professor in …

The Utah Statesman, January 14, 2020, Utah State University

The Utah Statesman

Weekly student newspaper of Utah State University in Logan.

Engineering Education Phd Student To Represent Usu At Women In Engineering Conference, Usu College Of Engineering

College of Engineering News

LOGAN, UTAH — Jan. 7, 2020 — Utah State University PhD student Lori Caldwell was selected as a graduate student finalist for the Women in Engineering Local Collegiate Competition to be held in Salt Lake City, Feb. 7-8. Caldwell will be recognized as an outstanding graduate student contributor in engineering at the conference. Caldwell earned a bachelor’s and a master’s degree in biological engineering from USU and is now in the second year of her PhD program under the direction of Dr. Angela Minichiello, assistant professor in the Department of Engineering Education.

Faculty Senate Agenda, January 6, 2020, Utah State University

Faculty Senate & Faculty Senate Executive Committee

• EPC Monthly Report - December 5, 2019
• Interim Day Expectations for Faculty
• Student Analytics Report
• Council on Teacher Education (One Pager) - Annual Report
• Scholarship Advisory Board Annual Report
• 401.3.3 Tenured and Tenure-Eligible Faculty (first reading)
• 405.3.1 Tenure and Promotion: Criteria for Librarians (first reading)
• 407.2 | 407.4 Procedures for Sanctions and other Reprimands (first reading)

Faculty Senate Minutes, January 6, 2020, Utah State University

Faculty Senate & Faculty Senate Executive Committee

Call to Order - Patrick Belmont

Approval of Minutes

University Business

• USU New and World Report
• 2020 Legislative Session

Information

• EPC Monthly Report
• Interim Day Expectations of Faculty
• Student Analytics Report

Reports

• Council on Teacher Education
• Scholarship Advisory Board Annual Report

New Business

• 403.3.3 Tenured and Tenure-Eligible
• 405.3.1 Tenure and Promotion
• 407.2 | 407.4 Procedures for Sanctions

Mariana Serpentinite Mud Volcanism Exhumes Subducted Seamount Materials: Implications For The Origin Of Life., Patricia Fryer, C. Geoffrey Wheat, Trevor Williams, Christopher Kelley, Kevin Johnson, Jeffrey Ryan, Walter Kurz, John W. Shervais, Elmar Albers, Barbara Bekins, Baptiste Debret, Jianghong Deng, Yanhui Dong, Philip Eickenbusch, Emanuelle Frery, Yuji Ichiyama, Richard Kevorkian, Et Al.

Geosciences Faculty Publications

The subduction of seamounts and ridge features at convergent plate boundaries plays an important role in the deformation of the overriding plate and influences geochemical cycling and associated biological processes. Active serpentinization of forearc mantle and serpentinite mud volcanism on the Mariana forearc (between the trench and active volcanic arc) provides windows on subduction processes.  Here, we present (1) the first observation of an extensive exposure of an undeformed Cretaceous seamount currently being subducted at the Mariana Trench inner slope; (2) vertical deformation of the forearc region related to subduction of Pacific Plate seamounts and thickened crust; (3) recovered Ocean …

Identifying Optimal Equivalent Area Changes To Reduce Sonic Boom Loudness, Troy Abraham, Douglas F. Hunsaker, Jonathan M. Weaver-Rosen, Richard J. Malak Jr.

Mechanical and Aerospace Engineering Student Publications and Presentations

This work explores the design space created from modeling the effect of localized geometric changes on a supersonic aircraft’s near-field pressure signature. These geometric changes are used to alter the aircraft’s near-field pressure signature in a way that reduces its sonic boom loudness at the ground. The aircraft used in this work is the NASA 25D concept and its near-field pressure signature is modeled using two separate methods. The first method uses the PANAIR panel code to obtain a near-field pressure signature for an axisymmetric representation of the 25D. This near-field signature is propagated to the ground using the NASA …

Minimum Induced Drag For Tapered Wings Including Structural Constraints, Jeffrey D. Taylor, Doug F. Hunsaker

Mechanical and Aerospace Engineering Student Publications and Presentations

For a wing in steady level flight, the lift distribution that minimizes induced drag depends on a tradeoff between wingspan and wing-structure weight. In 1933, Prandtl suggested that tapered wings have an advantage over rectangular wings due to this tradeoff. However, Prandtl’s solutions were obtained using assumptions that correspond to rectangular wings. Therefore, his claim was not analytically proven by his 1933 publication. Here, an approach similar to Prandtl’s is taken with more general approximations that apply to wings of arbitrary planform. This more general development is used to study Prandtl’s claim about tapered wings. Closed-form solutions for the optimum …

Voices Of Usu: An Anthology Of Student Writing, Vol. 13, Utah State University Department Of English

Voices of USU

This collection of student writing represents the voices of over 2,000 students who enroll each academic year in Utah State University’s second-year composition course, Intermediate Writing: Research Writing in a Persuasive Mode. Voices of USU celebrates excellence in writing by providing undergraduate students of diverse backgrounds and disciplines the opportunity to have their work published.

Aspen Soils Retain More Dissolved Organic Carbon Than Conifer Soils In A Sorption Experiment, Antra Boca, Astrid R. Jacobson, Helga Van Miegroet

T.W. "Doc" Daniel Experimental Forest

The effect tree species have on soil organic carbon (SOC) has been hotly debated but, so far, few clear patterns have emerged. One example of a differing tree species effect on SOC is aspen forests in North America, which have been found to have more stable SOC than adjacent conifer forest stands. An important source for the formation of stable organo-mineral complexes in the soil is dissolved organic carbon (DOC). DOC concentrations in mineral soil are often higher under the thick O-horizons of conifer forests than under aspen forests, but this does not correspond to more stable mineral SOC. This …

Do Teachers Have The Skills: 21st Century Skills In The Agricultural Education Classroom?, Kisia J. Weeks, Rebecca G. Lawver, Tyson J. Sorensen, Brian K. Warnick

Applied Sciences, Technology and Education Faculty Publications

Research has shown 21st century skills are essential to a student’s success outside of the high school classroom. The 21st century skills prepare students to enter the workforce or higher education with the ability to think critically and creatively, collaborate with others, take the initiative when approached with a task, and use technology to its fullest potential. This study examined school-based agricultural education teachers’ perceived knowledge, ability, and importance of implementing 21st century skills into the classroom. Upon identifying teachers perceived level of importance, knowledge, and ability, results were analyzed to determine the professional development needs of school-based agricultural education …

Electrifying: One Teacher’S Discursive And Instructional Changes Through Engagement In E-Textiles To Teach Science Content, Colby Tofel-Grehl, Eliza Jex, Kristin Searle, Douglas Ball, Xin Zhao, Georgia Burnell

Teacher Education and Leadership Faculty Publications

This paper shares findings from the first of its kind quasi-experimental mixed methods study exploring the potential impacts on teacher instruction through engagement with making and e-textiles. Because engagement in hands-on inquiry has demonstrated strong promise for increasing student interest and engagement in STEM careers, finding curricular approaches that engage students in project-based learning remains important. As such, the Maker Movement and making has gained traction as a possible effort to improve such outcomes. This study shares outcomes from analyses of one teacher’s first engagement with teaching eighth-grade science through e-textiles. Four of his classes were taught using his traditional …

Information Visualization Of Metacognitive Skills During The Software Development Process Based On An Adapted Engineering Design Metacognitive Questionnaire, R. R. Adisurya, H. B. Santoso, S. Fadhilah, Oenardi Lawanto

Engineering Education Faculty Publications

In software development, either alone or in a team, there are many aspects that determine the success in developing the software, including each developer's skills. Studies show that the application of metacognition can increase the effectiveness and efficiency of software development. To measure a metacognition skill, there need to be a metacognition measurement tools. One example of this measurement method is adapted engineering design metacognitive questionnaire. However, the respondents feel that existing tools still have not given them any benefits. This research is conducted to develop an information visualization tools for the metacognition measurement from an adapted engineering design metacognitive …

Studies On Secondary Electron Emission Induced Charging In Dielectric Materials: Novel Methods And Applications For Space And Plasma Technologies, Leandro Olano Garcia

Theses and Dissertations

The interaction of ionizing radiation with matter is of critical importance in many areas of science and technology such as space and plasma technology. Secondary electron emission is a direct consequence of electron irradiation on materials. To characterize materials in terms of secondary electron emission, the secondary emission yield (SEY) and the energy spectra of the secondary electrons are key physical properties. Secondary emission yields of materials are usually too high to avoid Multipactor effect or other related phenomena in applications for space. In addition, the measurement of electron energy spectra of secondary electrons in dielectric materials is a challenge …

A Semi-Kinetic Model Of Plasmasphere Refilling Following Geomagnetic Storms And Comparison With Hydrodynamic Results, Kausik Chatterjee, Robert W. Schunk

All Physics Faculty Publications

The objective of this paper is the development of a kinetic model for plasmasphere refilling following geomagnetic storms. The kinetic model is based on the ‘particle-in-cell’ method, a method based on the simulation of particle motion and thus well-suited to high altitude, low-density regimes, where the plasma transport equations are not valid. The model was validated with exact, analytical benchmarks, which are provided in this paper. The refilling results obtained from the kinetic model were then compared with results from a recently developed hydrodynamic solution methodology based on the ‘flux-corrected transport’ (FCT) method, and the limitations of hydrodynamic modeling for …

Peer-Prompted Engineering Design: How Do Adolescents Interact And Strategize?, Kristin Marie Strong, Oenardi Lawanto, Amy Wilson-Lopez

Engineering Education Faculty Publications

Engineering design was integrated into K–12 science education in the Next Generation Science Standards (NGSS Lead States, 2013), but teaching design remains a challenge for educators. Design problems are ill-defined, ill-structured, and complex problem-solving tasks. Their solutions require creativity and recursive, metacognitive processes that cannot be taught with simple algorithms. Moreover, adolescents do not demonstrate fully developed metacognitive skills because they are undergoing profound developmental changes. In this comparative case study, we explored how peer-delivered metacognitive prompts supported adolescents during a design challenge. We investigated how scripted prompts sparked reflection and stimulated design changes and identified which prompts were most …

Snow Processes In Mountain Forests: Interception Modeling For Coarse-Scale Applications, Nora Helbig, David Moeser, Michaela Teich, Laure Vincent, Yves Lejeune, Jean-Emmanuel Sicart, Jean-Matthieu Monnet

T.W. "Doc" Daniel Experimental Forest

Snow interception by the forest canopy controls the spatial heterogeneity of subcanopy snow accumulation leading to significant differences between forested and nonforested areas at a variety of scales. Snow intercepted by the forest canopy can also drastically change the surface albedo. As such, accurately modeling snow interception is of importance for various model applications such as hydrological, weather, and climate predictions. Due to difficulties in the direct measurements of snow interception, previous empirical snow interception models were developed at just the point scale. The lack of spatially extensive data sets has hindered the validation of snow interception models in different …

Aggie First Scholars: A Quality Workforce Initiative For Promoting First-Generation Student Success, Amanda M. Hagman, John Louviere, Heidi Kesler, Mykel Beorchia, Lisa Simmons, Mitchell Colver

Publications

Introduction: First-generation students lag behind continuing-generation peers in terms of graduation rates and average time to graduation. This phenomenon has been extensively studied in higher education with the intent of closing the gap seen between generational statuses. Utah State University provides services to support first-generation students. In the 2018/2019 academic year, USU initiative a full-kit initiative to help first-generation student participate in several proven first-year student milestones. This report explores the impact of full-kit use of services and the individual impact of each service on first-generation student persistence. METHODS: Students who self-identified as first-generation on their USU application were invited …

¡Mi Hijo Es Mío, Puñales! Excessive Paternal Devotion In Benito Pérez Galdós’S Torquemada Novels, Gabrielle Miller

Decimonónica

While Margaret Mead’s provocative statement that “motherhood is a biological necessity, but fatherhood is a social invention” may be inherently problematic, it successfully underlines “the role of the father” as a culturally-inscribed rather than universal construct (cited in Garbarino 13). In industrialized Western countries of the nineteenth century, the dominant gender ideology of the so-called separate spheres defined the “good father” as a “distant breadwinner” who, as unequivocal family patriarch, provided for his family’s material needs through monetarily-compensated work (Lupton and Barclay 14). Unsurprisingly, the dominant model of fatherhood that emerged in Spain in the second half of the nineteenth …

International Future Energy Challenge Power Supply For Nanosatellites, Parker Ames, Keith Bird, Ashley Buxton, Brad Dyer, Matt Hansen, Joshua Zaugg

Electrical and Computer Engineering

Objective: build a nanosatellite power supply that matches the requirements for the IFEC 2020 competition

Membrane Bioreactor For Urea Removal, Jake Accordino, Morgan Bishop, Mitchel Heap, Banner Wald

Biological Engineering

Background

• Dialysis is a system designed to remove impurities from blood through filtration

• Peritoneal dialysis pumps dialysate into the peritoneal cavity and utilizes the peritoneal membrane as a natural membrane to achieve this filtration

• Patients who receive peritoneal dialysis are prone to infection and discomfort as the dialysate must be replaced 3-5 times a day to ensure continuous removal of waste

Objectives

• This research will develop a secondary membrane designed to remove 20 grams of urea from the dialysate per day

• The secondary filtration will decrease the need to change the dialysate more than once …

Can Farmers And Bats Co-Exist? Farmer Attitudes, Knowledge, And Experiences With Bats In Belize, Hannah G. Shapiro, Adam S. Willcox, Mallory Tate, Emma V. Willcox

Human–Wildlife Interactions

Bats (Chiroptera) are often viewed negatively by the public. Negative public perceptions of bats may hinder efforts to conserve declining populations. In Belize, the presence of vampire bats (Desmodus rotundus and Diphylla ecaudata) exacerbates the potential for conflicts with humans because of the increased rabies transmission risks. To mitigate these risks, the Belize government provides farmers with assistance to trap and remove vampire bats. In June 2018, we surveyed farmers (n = 44) in and adjacent to the Vaca Forest Reserve in Belize to learn more about their attitudes, knowledge, and experiences with bats. This information may …

Use Of Roadside Deer Removal To Reduce Deer–Vehicle Collisions, John C. Kilgo, John I. Blake, Tracy E. Grazia, Andy Horcher, Michael Larsen, Thomas Mims, Stanley J. Zarnoch

Human–Wildlife Interactions

Identification of management tools to reduce the incidence of deer–vehicle collisions (DVCs) is important to improve motorist safety. Sharpshooting to reduce white-tailed deer (Odocoileus virginianus; deer) along roads has proven successful in urban situations but has not been evaluated in undeveloped areas. We used a before-after-control-impact (BACI) design to evaluate the use of sharpshooting to reduce DVCs along roads on the uninhabited U.S. Department of Energy’s Savannah River Site, South Carolina, USA, during 2011–2017. We removed 242 deer from 4 treatment roads during 2015 and 2016, with 2-year removal rates per road averaging 5.0 deer/km of road (range …

A Psychometric Comparison Of Psychological Inflexibility Measures: Discriminant Validity And Item Performance, Clarissa W. Ong, Benjamin G. Pierce, Julie M. Petersen, Jennifer L. Barney, Jeremiah E. Fruge, Michael E. Levin, Michael P. Twohig

Psychology Faculty Publications

Psychological inflexibility is a rigid behavioral pattern that interferes with engagement in personally meaningful activities; it is the hypothesized root of suffering in acceptance and commitment therapy (ACT). Thus, the quality of its measurement affects the research, theory, and practice of ACT. The current study aimed to evaluate the discriminant validity and item performance of four measures of psychological inflexibility: the Acceptance and Action Questionnaire—II (AAQ-II), a revised version of the AAC-II (AAQ-3), the Brief Experiential Avoidance Questionnaire (BEAQ), and the Comprehensive assessment of Acceptance and Commitment Therapy processes (CompACT). We analyzed data from community (n = 253), student …