Nature Inspired Solid–Liquid Phase Amphibious Adhesive, Alin Cristian Chipara, Gustavo Brunetto, Sehmus Ozden, Henrik Haspel, Partha Kumbhakar, Ákos Kukovecz, Zoltán Kónya, Robert Vajtai, Mircea Chipara, Douglas S. Galvao

Physics & Astronomy Faculty Publications

Here we report a new class of bio-inspired solid–liquid adhesive, obtained by simple mechanical dispersion of PVDF (polyvinylidene fluoride) (solid spheres) into PDMS (polydimethylsiloxane) (liquid). The adhesive behavior arises from strong solid–liquid interactions. This is a chemical reaction free adhesive (no curing time) that can be repeatedly used and is capable of instantaneously joining a large number of diverse materials (metals, ceramic, and polymer) in air and underwater. The current work is a significant advance in the development of amphibious multifunctional adhesives and presents potential applications in a range of sealing applications, including medical ones.

A Simple Graphical Method For Calculating The Standing Wave Frequencies On A Rectangular Membrane, Joseph D. Romano, Richard H. Price

Physics & Astronomy Faculty Publications

In introductory physics courses, simple arguments based on traveling waves on a string are used to relate the frequency of standing waves to boundary conditions, e.g., the fixed ends of the string. Here, we extend that approach to two-dimensional waves such as the oscillations of a rectangular membrane with edges fixed at the boundary. This results in a graphical method that uses only simple geometry and is suitable for explaining two-dimensional standing-wave oscillations to non-science majors, e.g., in a physics of sound and music class.

Emulsion Stability Of Heavy Oil With Surfactants And Nanoparticles, Zainab Abdulmohsein, Baojun Bai, Parthasakha Neogi

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The recovered crude oil is often in form of an emulsion and the recovery is cut off when water to oil ratio exceeds a certain amount. The emulsions vary from water-in-oil to oil-in-water and the step that follows is to coalesce droplets to get two continuous liquids. Difficulties arise when the oil contains emulsifiers. There are naturally occurring surfactants, or the oil recovered is by enhanced oil recovery techniques which have additives that stabilize the droplets. We have considered below a heavy oil (viscosity 650-750 mPa.s) containing one of the three surfactants: a nonionic surfactant or a cationic surfactant or …

Integrated Multiple Adaptive Design Involving Sample Size Re-Estimation And (Covariate-Adjusted) Response-Adaptive Randomization For Continuous And Binary Outcomes, Christine M. Orndahl

Theses and Dissertations

Historically, clinical trials have been performed based on decisions made prior to the start of the trial. Adaptive designs have been developed to provide increased flexibility, allowing pre-specified changes to occur based on interim data. Each adaptive design addresses a unique pitfall of a non-adaptive design, such as minimizing the chance of an under- or over-powered study by utilizing interim data to update the sample size estimate (sample size re-estimation) or increasing the ethical benefit of a trial by allocating more participants to the better performing treatment group ([covariate-adjusted] response-adaptive randomization). Additional benefit is attainable by combining more than one …

Smallest Worthwhile Effect Values For Pain And Function After A Total Knee Replacement, Nancy Wofford

Theses and Dissertations

ABSTRACT

SMALLEST WORTHWHILE EFFECT VALUES FOR PAIN AND FUNCTION AFTER A TOTAL KNEE REPLACEMENT

Nancy Henderson, PT

A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Virginia Commonwealth University.

Virginia Commonwealth University, 2020

Dr. Dan Riddle, PT, PhD, Physical Therapy

Meaningful change is an important concept in healthcare as it allows providers to better understand the efficacy of an intervention. Three commonly used methods to assess meaningful change include the distribution-based, anchor-based, and benefit-harm trade-off methods. The benefit-harm trade-off method improves upon the limitations of the distribution-based and anchor-based methods. Unlike the …

Regional Drivers Of Organic Carbon Age In Lotic Systems Of The Conterminous United States, Kaycee Faunce

Theses and Dissertations

Rivers play a critical role in global carbon (C) budgets despite their comparatively small surface area. A significant portion of the terrestrial C that they receive is transformed, re-mineralized, or stored during transit to the ocean. Radiocarbon (∆¹⁴C) data show that a fraction of riverine organic C (OC) has been pre-aged in the terrestrial environment. Lateral export of carbon from these aged pools may contribute to atmospheric carbon dioxide emissions through microbial and photochemical oxidation. However, little is known about the regional climatic, anthropogenic, and landscape factors that promote the mobilization of aged OC to rivers. This study …

Spectrum 2020, Saint Mary's College Of California

The Undergraduate Spectrum

No abstract provided.

Modeling And Characterization Of A Pull-In Free Mems Microphone, Mehmet Ozdogan, Shahrzad Towfighian, Ronald Miles

Mechanical Engineering Faculty Scholarship

In this study, we examine the feasibility of designing a MEMS microphone employing a levitation based electrode configuration. This electrode scheme enables capacitive MEMS sensors that could work for large bias voltages without pullin failure. Our experiments and simulations indicate that it is possible to create robust sensors properly working at high DC voltages, which is not feasible for most of the conventional parallel plate electrode-based micro-scale devices. In addition, the use of larger bias voltages will improve signal-to-noise ratios in MEMS sensors because it increases the signal relative to the noise in read-out circuits. This study presents the design, …

Lateral Pull-In Instability Of Electrostatic Mems Transducers Employing Repulsive Force, Meysam Daeichin, Ronald Miles, Shahrzad Towfighian

Mechanical Engineering Faculty Scholarship

We report on the lateral pull-in in capacitive MEMS transducers that employ a repulsive electrostatic force. The moving element in this system undergoes motion in two dimensions. A two degree-offreedom mathematical model is developed to investigate the pull-in quantitatively. The nonlinear electrostatic force, which is a vector function of two spatial coordinates, is determined by calculating the potential energy of the system using a boundary element approach. The equilibrium points are found by numerically solving the nonlinear coupled static equations. A stability analysis reveals that depending on the values of the lateral and transverse stiness, the system undergoes dierent bifurcations …

Individual And Community Social Determinants Of Health Associated With Diabetes Management In A Mexican American Population, Kehe Zhang, Belinda Reininger, Miryoung Lee, Qian Xiao, Cici Bauer

Faculty, Staff and Student Publications

Background: Diabetes is a major health burden in Mexican American populations, especially among those in the Lower Rio Grande Valley (LRGV) in the border region of Texas. Understanding the roles that social determinants of health (SDOH) play in diabetes management programs, both at the individual and community level, may inform future intervention strategies.

Methods: This study performed a secondary data analysis on 1,568 individuals who participated in Salud y Vida (SyV), a local diabetes and chronic disease management program, between October 2013 and September 2018 recruited from a local clinic. The primary outcome was the reduction of hemoglobin A1C (HbA1C) …

Design, Synthesis, And Characterization Of Chemical Tools To Study Peroxisomal Import, Jhalak N. Timilsena

Masters Theses

Peroxisomes are dynamic and interconnected single lipid membrane bound organelles found in the eukaryotic cells which are involved in various biochemical processes including the b-oxidation of very long chain and branched chain fatty acids, metabolism of reactive oxygen and nitrogen species, and reduction of hydrogen peroxide among others. These organelles are known to host numerous proteins and enzymes depending on the cellular environment. All of the proteins needed in the peroxisomes are encoded in the nucleus and synthesized in the cytosol which are then transported to the peroxisomes with the help of a sophisticated protein-transport machinery. Pex5 is one of …

Nsdroid: Efficient Multi-Classification Of Android Malware Using Neighborhood Signature In Local Function Call Graphs, Pengfei Liu, Weiping Wang, Xi Luo, Haodong Wang, Chushu Liu

Electrical and Computer Engineering Faculty Publications

With the rapid development of mobile Internet, Android applications are used more and more in people's daily life. While bringing convenience and making people's life smarter, Android applications also face much serious security and privacy issues, e.g., information leakage and monetary loss caused by malware. Detection and classification of malware have thus attracted much research attention in recent years. Most current malware detection and classification approaches are based on graph-based similarity analysis (e.g., subgraph isomorphism), which is well known to be time-consuming, especially for large graphs. In this paper, we propose NSDroid, a time-efficient malware multi-classification approach based on neighborhood …

An Extensive Set Of Kinematic And Kinetic Data For Individuals With Intact Limbs And Transfemoral Prosthesis Users, Seyed Abolfazl Fakoorian, Arash Roshanineshat, Poya Khalaf, Vahid Azimi, Daniel J. Simon, Elizabeth Hardin

Electrical and Computer Engineering Faculty Publications

This paper introduces an extensive human motion data set for typical activities of daily living. These data are crucial for the design and control of prosthetic devices for transfemoral prosthesis users. This data set was collected from seven individuals, including five individuals with intact limbs and two transfemoral prosthesis users. These data include the following types of movements: (1) walking at three different speeds; (2) walking up and down a 5-degree ramp; (3) stepping up and down; (4) sitting down and standing up. We provide full-body marker trajectories and ground reaction forces (GRFs) as well as joint angles, joint velocities, …

Interaction, Collaboration And Content Creation In Informal Online Learning Environments: Multidimensional Analyses Of Longitudinal Data From The Scratch Coding Community, Seung B. Lee

Theses and Dissertations

Despite rising levels of participation by children and adolescents in large, informal online learning communities, there has been limited research examining the role that social dynamics play on the online behavior of young users. In this context, this mixed-methods longitudinal study aimed to investigate the relationship between interaction, collaboration and content creation through the analysis of user-generated comments and log-data from the Scratch platform. The research focused on more than 45,000 comments associated with the online activity of 200 randomly selected participants over a period of three months in early 2012. A combination of methodological techniques was applied in the …

Impact Of Sickle Cell Disease On Executive Functioning In An Adult Population, Christina Wade

Theses and Dissertations

Children diagnosed with sickle cell disease (SCD) struggle with executive functions (EF); however, there is a paucity of research on neuropsychological outcomes in adults with SCD. This study aimed to examine differences in EF between adults with SCD and healthy controls. Thirty- one patients with SCD and 34 healthy controls (ages 18-45) participating in an IRB-approved Children’s Hospital Los Angeles (CHLA) study of cerebral blood flow underwent neuropsychological evaluation using the Delis–Kaplan Executive Function System (D-KEFS) Trail Making and Color Word Interference Tests and the Wechsler Adult Intelligence Scale - Fourth Edition (WAIS-IV) Digit Span subtest to assess various aspects …

Best Leadership Practices Of Female Film Directors, Sara Carraway

Theses and Dissertations

Female film directors are highly underrepresented within the U.S. film industry, especially within narrative film (S.L. Smith, Pieper, & Choueiti, 2013). In 2019, only 12% of directors in the top 100 grossing films were female (Lauzen, 2020). There are several obstacles female directors face in their careers. Financing is more difficult to obtain for female directors due to stereotypes of women as risky investments (P. Smith et al., 2013). Closely tied to financing, gendered networks and homophily can prevent women from making relationships with gatekeepers and accessing the same opportunities as men (Jones & Pringle, 2015; Wing-Fai et al., 2015). …

Strategies Aimed At Helping African American Male Students Succeed In United States Secondary Schools: A Metasynthesis, Chibuzo N. Azinge-Walton

Theses and Dissertations

The persistent disparity in graduation rates between Black and White male students in U.S. secondary schools (the achievement gap) despite repeated efforts to even it out, is a thorn in the flesh of educators, the country over. The elimination of this continuous disparity through viable solutions, is the focus of this study. A problem is ninety percent solved when it thoroughly understood, with its comprehension necessitating a large investment of thought, time, and resources (Einstein, 1879-1955). To fully grasp the inner pinning of the achievement gap dilemma, this researcher selected, read, and reviewed 50 subject matter-related archived articles/studies obtained from …

Governing Cascade Failures In Complex Social-Ecological-Technological Systems: Framing Context, Strategies, And Challenges, J.B. Ruhl

Vanderbilt Law School Faculty Publications

Cascade failures are events in networked systems with interconnected components in which failure of one or a few parts triggers the failure of other parts, which triggers the failure of more parts, and so on. Cascade failures occur in a wide variety of familiar systems, such as electric power distribution grids, transportation systems, financial systems, and ecosystems. Cascade failures have plagued society for centuries. However, modern social-ecological-technological systems (SETS) have become vast, fast moving, and highly interconnected, exposing these systems to cascade failures of potentially global proportions, spreading at breathtaking speed, and imposing catastrophic harms. The increasing potential for cascade …

Students’ Perspectives And Engagement Transforming Newly Acquired Knowledge To Long-Term Memory Utilizing The Deliberate Practice Framework, Kathleen Mae Fischer, Taran Thomas Williams, Joseph David Hannigan

Pedagogicon Conference Proceedings

As students progress through their college years, they face the task of acquiring large volumes of information from a variety of classes. Many educative and psychological associations have proven that student performance is directly affected by the student perspective and the amount of engagement with each exercise. The greater the effort a student invests in the exercise, the greater the classroom performance quality. The results demonstrate better long-term memory while utilizing the deliberate practice framework through repetition. For our exercise, we started by administering a brief survey to assess students’ perspectives, confidence levels and engagement preferences. Students were encouraged to …

Creating A Deep Learning Environment In A Virtual Lab For Cybersecurity, Randall Joyce, Brandon Dixon, Abdul Yarali

Pedagogicon Conference Proceedings

In today’s world, there is an increasing need for cybersecurity professionals because of the increase of Internet-connected devices, digital assets, and information systems infrastructure. Growth of automation and digitization, enterprise safety risks, the illusion of privacy and consumer data breaching, data storage, and management in the world of massive internet device connectivity that is expected in the near future collectively bring new security concerns. In order for students to gain the required skill sets to enter the workforce, they need hands-on experience to build essential employability qualities, confidence, knowledge, and experience. Murray State University’s Telecommunications Systems Management program uses a …

Developing Active Learning Exercises For Any Content, Cynthia Dickerson, Rachel M. Hopp, Jeffery A. Masters

Pedagogicon Conference Proceedings

Teaching and learning both should be fun, engaging, and impactful in lasting ways. Studies show that student engagement and information retention increases when students are immersed in active learning - hands-on usage of the information. Modern faculty members are seeking methods of incorporating active learning into their teaching, but may not know where to start when creating their own active learning materials. This paper will outline a process for creating new activities. Included are appendices full of creative active-learning formats (hot topics borrowed from primary and secondary education), as well as guidelines on when to use them that will make …

The Labour Of Austerity: Absurdity, Performative Resistance, And Cultural Transformation, Nora Almeida

Publications and Research

This essay explores the social-psychic toll of prolonged austerity on academic librarians and the range of strategies that have (or could) serve as tools of resistance. Using a combination of theoretical analysis and autoethnography, I examine the emotional impact of bottomless and invisible labour imposed by austerity and the ways institutions use emotional coercion to promote self-surveillance, meta-work, and hyper-productivity. Following this analysis, I discuss the ways that oppressive institutional cultures silence dissent and absorb common resistance tactics advocated by educators. Finally, I introduce several examples of performance-based resistance projects and explore how creative, personal, and absurd forms of protest …

Dissolved Organic Matter Movement Across Lake Superior’S Terrestrial-Stream-Coastal Interface, Karl M. Meingast

Dissertations, Master's Theses and Master's Reports

Dissolved organic matter (DOM) represents a carbon pool that can be easily translocated between ecosystems with the movement of water. This study examines the controls on DOM quantity and character delivered to Lake Superior primarily during the snowmelt period. We employed long-term stream dissolved organic carbon (DOC) data to determine quantity as well as absorption and fluorescence spectroscopy to analyze DOM structure. Our results indicate that an increasing trend in DOC concentrations, likely driven by decreases in acidity of precipitation, combined with slightly less annual runoff have resulted in relatively constant fluxes of DOM to Lake Superior. Additionally, our study …

Higher Accuracy Methods For Fluid Flows In Various Applications: Theory And Implementation, Dilek Erkmen

Dissertations, Master's Theses and Master's Reports

This dissertation contains research on several topics related to Defect-deferred correction (DDC) method applying to CFD problems. First, we want to improve the error due to temporal discretization for the problem of two convection dominated convection-diffusion problems, coupled across a joint interface. This serves as a step towards investigating an atmosphere-ocean coupling problem with the interface condition that allows for the exchange of energies between the domains.

The main diffuculty is to decouple the problem in an unconditionally stable way for using legacy code for subdomains. To overcome the issue, we apply the Deferred Correction (DC) method. The DC method …

The Effect Of Spacing Of Vetiver Grass (Chrysopogon Zizanioides) Hedgerows On Hillslope Erosion In Eastern Region, Ghana, Evan R. Lanese

Dissertations, Master's Theses and Master's Reports

Soil erosion in Ghana negatively effects many small holder farmers due to heavy rainfall, continuous land use, and a changing climate. Inexpensive, local, and sustainable practices that can be used to reduce soil movement thus building productive soils would benefit farmers in Ghana. Vetiver grass (Chrysopogon zizanioides) has been used to this effect worldwide. Its local availability and positive reputation leaves desire to learn about its applicability in Ghana. A field study was conducted on plots of sloping farmland (10ft by 60ft) with three treatments: (1) control with no vetiver grass, (2) two vetiver grass hedgerows, (3) four …

A Progressive Output Strategy For Real-Time Feedback Control Systems, Qiming Zou, Ling Wang, Jie Liu, Yingtao Jiang

Electrical & Computer Engineering Faculty Research

The real-time requirements imposed on a feedback control system are often hard to be met, as the controller spends a disproportionately large amount of time waiting for a control cycle to reach its final state. When such a final state is established, multiple tasks have to be prioritized and launched altogether simultaneously, and the system is given an extremely short time window to generate its output. This huge gap between the wait and action times, perceived as a load unbalancing problem, hinders a control decision to be made in real time. To address this challenging problem, in this paper, we …

Dynamic Allocation/Reallocation Of Dark Cores In Many-Core Systems For Improved System Performance, Xingxing Huang, Xiaohang Wang, Yingtao Jiang, Amit Kumar Singh, Mei Yang

Electrical & Computer Engineering Faculty Research

A significant number of processing cores in any many-core systems nowadays and likely in the future have to be switched off or forced to be idle to become dark cores, in light of ever increasing power density and chip temperature. Although these dark cores cannot make direct contributions to the chip's throughput, they can still be allocated to applications currently running in the system for the sole purpose of heat dissipation enabled by the temperature gradient between the active and dark cores. However, allocating dark cores to applications tends to add extra waiting time to applications yet to be launched, …

Full Issue

Interpreter: A Journal of Latter-day Saint Faith and Scholarship

No abstract provided.

Times Of Reckoning And Set Times In Abraham 3, J. Ward Moody

Interpreter: A Journal of Latter-day Saint Faith and Scholarship

The third chapter of Abraham considers two types of times regarding the moon, the earth, and the planets: “times of reckoning” and “set times.” A straightforward interpretation of these two times, if correct, sheds light on the cosmology known to Abraham. “Times of reckoning” may be understood as the times of celestial movements directly observed or reckoned by someone standing on the surface of the earth. These times would most likely be synodic, meaning the motion being considered is referenced to the sun, but they could also be sidereal, meaning referenced to the stars. Observed from the earth’s surface, times …

David O. Mckay And Progressive Education Implementation For The Sunday School, Mary Jane Woodger

Religious Educator: Perspectives on the Restored Gospel

In 1897 David O. McKay graduated from the University of Utah with a Normal (Teaching) Certificate. He would become the first president of The Church of Jesus Christ of Latter-day Saints to have a college education and to have previously been a professional educator. This educational background would permeate every position McKay would hold in the hierarchy of the Church.