Digital Commons Network^™

A Variable Stiffness Energy Dissipation Device For Vibration Control Of Steel Frames, Tie Zheng

Dissertations - ALL

Structures without energy dissipation devices rely primarily on plastic or inelastic deformations to dissipate energy from earthquakes. As a result, the amount of inelastic deformations and damage level will increase as the earthquake severity increases. However, structures equipped with energy dissipation devices are expected to experience less inelastic deformations and so their safety and integrity can be better preserved.In this research, a new device called the variable stiffness energy dissipation device is conceptualized and numerically studied. Using nonlinear time history analysis, results are obtained to illustrate the effectiveness of the proposed device in enhancing the seismic performance of shear and …

Investigation Of Lithium-Ion Battery Electrode Fabrication Through A Predictive Particle-Scale Model Validated By Experiments, Mojdeh Nikpour

Theses and Dissertations

Next-generation batteries with improved microstructure and performance are on their way to meet the market demands for high-energy and power storage systems. Among different types of batteries, Li-ion batteries remain the best choice for their high energy density and long lifetime. There is a constant but slow improvement in Li-ion batteries by developing new materials and fabrication techniques. However, further improvements are still needed to meet government and industry goals for cost, cycling performance, and cell lifetime. A fundamental understanding of particle-level interactions can shed light on designing new porous electrodes for high-performance batteries. This is a complex problem because …

The Blaeser Training Taxonomy, Timothy Blaeser

Doctorate in Education

This research was undertaken to determine the efficacy of using andragogy, assessment, and quality control for training in a modern industrial workplace, with findings indicating that these modern training techniques can be implemented with success in this context. While andragogy, pioneered by Knowles, has been used in many areas of adult education, it has not been found to be commonly used in the industrial workplace. The study focused on Finnish trainers using the Blaeser Training Taxonomy – a training program utilizing elements of andragogy and assessment wrapped into quality control. Using a mixed methods questionnaire, trainers reported their training results, …

Predicting Drug-Induced Liver Injury With Artificial Intelligence, Ting Li

Theses and Dissertations

Drug-induced liver injury (DILI) is an undesirable side effect to the liver caused by the common use of drugs, which is of great concern to the patients, physicians, the pharmaceutical industry, and government regulators. The current animal testing models do not present reliable results on the human DILI risk prediction during the preclinical phase. Therefore, there is an urgent need to find alternative methods to improve the human DILI risk prediction during the early stage of development. Utilizing the accumulated high-throughput transcriptomics profiles from L1000, we constructed an 8-layer deep neural network for human DILI prediction based on the largest …

Detecting Supraglacial Debris Thickness With Gpr Under Suboptimal Conditions, Alexandra Giese, Steven Arcone, Robert Hawley, Gabriel Lewis, Patrick Wagnon

Dartmouth Scholarship

The thickness of a supraglacial layer is critical to the magnitude and time frame of glacier melt. Field-based, short pulse, ground-penetrating radar (GPR) has successfully measured debris thickness during a glacier's melt season, when there is a strong return from the ice-debris interface, but profiling with GPR in the absence of a highly reflective ice interface has not been explored. We investigated the performance of 960 MHz signals over 2 km of transects on Changri Nup Glacier, Nepal, during the post-monsoon. We also performed laboratory experiments to interpret the field data and investigate electromagnetic wave propagation into dry rocky debris. …

A Portrait Of Postsecondary Stem Teaching: Examining The Roles Of Organizational Climate And Professional Identity, Sule Aksoy

Dissertations - ALL

Many empirical studies on the factors associated with the use of evidence-based instructional practices have examined the individual and contextual characteristics. However, little attention has been afforded to the role of context and practice on teacher identity. This dissertation consists of three-article style papers that examine the relationship between contextual factors, teacher identity, and instructional practices to fill this gap in the literature. Chapter 1 provides a deep understanding of organizational climate in STEM departments concerning teaching practices. Significant differences in organizational factors such as leadership, resources, and respect for teaching were found between graduate instructors and the faculty. Similarly, …

Policy And Polity: Space, Boundaries, And Governance In Early Modern London, 1580-1640, Michael Britton

Dissertations - ALL

The kingdom's principal city for law, governance, trade, and consumption, early modern London experienced a period of rapid growth and sprawl from the mid-sixteenth century. This nurtured more dense and frequent mobility and produced a dynamic, kinetic city. For civic authorities, however, boundaries took on greater urgence. Drawing on theories and principles of border studies, this dissertation treats the city's boundaries as processes forged and transformed by engagement, by the interplay between popular activity, political programs, and perceptions of space and authority. Policy and Polity, Space, Boundaries, and Governance in Early Modern London, 1580-1640 examines bordering at London Bridge, the …

Adsorption Of Organic Iodides On Reduced Silver Functionalized Silica Aerogel, Siqi Tang

Dissertations - ALL

In the nuclear waste reprocessing, radioactive iodine is released in both organic and inorganic forms into off-gas streams. Due to its properties of long half-life and accumulation in human bodies, the radioactive iodine is required to be removed by the Environmental Protection Agency (EPA) and Nuclear Regulatory Commission (NRC). In this presented work, the removal of organic iodides is studied particularly. Unlike that of inorganic iodine, the organic iodides were not well studied because of the low concentrations and the corresponding technical difficulties. Most of the studies on the organic iodides are semi-quantified, focusing on the performances of the adsorption …

Analysis Of Multiple Degree-Of-Freedom Oscillatory Aquatic Propulsion, Seth Alan Brooks

Dissertations - ALL

Propulsive performance and flow field data were experimentally measured for a two degree-of-freedom fish platform. The fish platform was designed and constructed based on the yellowfin tuna (\textit{Thunnus albacares}) that is known to be both fast and efficient. This work extends the current understanding of oscillatory aquatic propulsion to a three-dimensional fish platform with full volume flow field data and propulsive performance. A parametric sweep of trailing-edge amplitude of the caudal fin ($A$), heave-to-pitch ratio ($h^*$), and phase offset between the two degrees-of-freedom ($\phi$) was used to explore a parameter space that encompasses and extends beyond the known biological domain. …

Review Of Key Elements Of Green Chemistry, Debasish Bandyopadhyay

Open Educational Resources - Reviews

No abstract provided.

Exploiting Building Demand Flexibility Through Machine Learning For Building-To-Grid Integration, Hannah Charlene Fontenot

Dissertations - ALL

Demand flexibility – the ability to adjust a building's load profile across different timescales – is a key aspect of the ongoing effort to increase interconnectivity between buildings and the power grid. By harnessing their demand flexibility, buildings can provide significant benefits to the grid and bolster grid resilience and reliability. To facilitate the transition toward the "smart grid", new and intelligent control approaches are required that can seamlessly integrate building, occupant, and grid data and effectively control multiple building assets to provide grid services while maintaining occupants' required thermal comfort levels and reducing the building's overall energy consumption and …

Algorithm Hardware Codesign For High Performance Neuromorphic Computing, Haowen Fang

Dissertations - ALL

Driven by the massive application of Internet of Things (IoT), embedded system and Cyber Physical System (CPS) etc., there is an increasing demand to apply machine intelligence on these power limited scenarios. Though deep learning has achieved impressive performance on various realistic and practical tasks such as anomaly detection, pattern recognition, machine vision etc., the ever-increasing computational complexity and model size of Deep Neural Networks (DNN) make it challenging to deploy them onto aforementioned scenarios where computation, memory and energy resource are all limited. Early studies show that biological systems' energy efficiency can be orders of magnitude higher than that …

A Graduatte Level Immersive-Simulattion Program For Teaching And Assessing Fundamental Skills In Entry Level Clinical Perfusionists., Bruce Searles

Dissertations - ALL

Background: The clinical perfusionist is a member of the open-heart-surgery team and responsible for operating the life support equipment that replaces the function of the patient's heart and lungs and arrests and restarts the patient's heart in the course of a Cardiopulmonary Bypass (CPB) procedure. In the perfusionists scope of practice, the consequence of unskilled actions, inaccurate understanding or delayed decision making may result in significant patient morbidity or even death. Historically, perfusion students have learned and practiced their skills within a clinical preceptorship program in which an experienced clinician allows the novice student to operate the life support equipment …

Antimicrobial Susceptibility Of P. Aeruginosa Clinical Isolates, Tian Gao

Theses - ALL

Long-term infection caused by P. aeruginosa poses a major threat to personal and public health, and causes billions of dollars in medical expenses. To develop more effective controls, it is important to accurately evaluate antibiotic susceptibility of clinical isolates and understand how susceptibility changes during the course of infection. Conventional drug susceptibility tests using nutrient-rich media have been questioned regarding their relevance due to the difference between the model in vivo test conditions and the environment in the patients. Here, we report that 27 clinical strains of P. aeruginosa isolated from cystic fibrosis patients showed higher drug resistance in Artificial …

2012 December University Of Memphis Commencement Program

Commencements

Program for the Fall convocation of the 101st commencement of the University of Memphis at Memphis, Tennessee, held at the FedEx Forum on December 16, 2012.

Protecting The University As A Physical Place In The Age Of Postdigitization, Ryan M. Allen, Peter Mclaren

Education Faculty Articles and Research

Covid-19 forced higher education sectors across the world to digitize the entire university experience online. There are now calls for universities to continue chasing continued and further digitization, often from for-profit businesses and those in Silicon Valley who have been promising to disrupt the sector for decades. We argue that the pandemic has illustrated how crucial universities are to their local communities, and efforts should be made to emphasize their physical place and space. The destruction of American cities in favor of auto-centric suburbs provides a parallel for the possible future of higher education. The Cult of Efficiency mindset and …

Quantitative Polarized Light Imaging Of Histologically Stained Rat Humerus Cartilage, Gustavo De Paiva

Mechanical Engineering and Materials Science Independent Study

The objective of my independent study was to understand how the collagen strength and alignment look across healthy and injured elbow samples.

Realistic Additions To Matlab Simulation Of Active Particles In An Acoustic Field, Emily Ma

Mechanical Engineering and Materials Science Independent Study

Acoustic microfluidics provides a contact-free method of manipulating active particles; however, versatile and quick performance quantification of these methods is needed to further apply acoustofluidic techniques in broader settings. Motile Chlamydomonas reinhardtii algae cells continuously swim and redistribute as they are subject to an acoustic field. For performance quantification, this eliminates the tedious procedure of resetting the experiment after each trial, which is necessary when using passive particles as probes. Thus, this method of calibration using active particles is more efficient than using passive particles. Utilizing an accurate simulation of physical active particle experiments is helpful in quickly predicting how …

The Dark Realism Of Miyazawa Kenji: Social Activism In The Science-Fiction Children's Story, The Life Of Gusukō Budori, And Its Precursor Work, Elsiemae Ann Ito

Dissertations and Theses

Miyazawa Kenji (1896-1933) is widely known in Japan as a children's story writer and poet, but he was also grounded in real life as a teacher, soil scientist, and farmer. Recognizing the harsh realities for farmers in his native Iwate, he nonetheless dreamed of an ideal world, as seen in his stories. To better understand the dark realities of life in Iwate, Japan, Miyazawa changed his occupation from teacher to farmer, focusing more on social activism that would better the lives of the people in his community. His late children's story, The Life of Gusukō Budori (Gusukō Budori no …

Aging Study Of Silver-Exchanged Mordenite And Silver-Functionalized Silica Aerogel In Dry Air, Humid Air, No And No2, Seungrag Choi

Dissertations - ALL

Iodine-129 (129I) is one of the volatile radioactive species in the off-gas streams generated from the spent nuclear fuel reprocessing system, and it is essential to remove 129I vapor because 129I has a long half-life (1.6 x 107 years) and can be fatal to the human body if released to the environment. Radioactive iodine vapor can be effectively captured by silver containing adsorbents such as silver exchanged mordenite (Ag0Z) and silver functionalized silica aerogel (Ag0-aerogel) used in this study. However, the aging impact of off-gas streams on the adsorbents is one of major issues in the removal of radioactive iodine …

Rational Design Of Supported Metal Catalysts For Carbonyl Reduction During Biomass Upgrading, Xin Gao

Dissertations - ALL

Ketone hydrogenation:A model system of carbonyl (ketone) hydrogenation, acetone hydrogenation over supported Pt catalysts in the gas-phase fixed bed reactor was investigated to understand both the mechanism and rate controlling steps in a fundamental level. The experiments and outcomes include the detailed macro- and micro-kinetic analysis of hydrogenation of acetone. The apparent reaction orders of hydrogen and acetone, apparent activation energies, and observed kinetic isotope effects over a large range of temperatures and concentrations (compound partial pressures) are reported in this document. Generally speaking, the ketone hydrogenation over metal surfaces in vapor phase comply with the mechanism that hydrogen atoms …

Improved Bathymetry Leads To >4000 New Seamount Predictions In The Global Ocean – But Beware Of Phantom Seamounts!, C Yesson, Tb Letessier, A Nimmo-Smith, P Hosegood, As Brierley, M Hardouin, R Proud

School of Biological and Marine Sciences

Seamounts are important marine habitats that are hotspots of species diversity. Relatively shallow peaks, increased productivity and offshore locations make seamounts vulnerable to human impact and difficult to protect. Present estimates of seamount numbers vary from anywhere between 10,000 to more than 60,000. Seamount locations can be estimated by extracting large, cone-like features from bathymetry grids (based on criteria of size and shape). These predicted seamounts are a useful reference for marine researchers and can help direct exploratory surveys. However, these predictions are dependent on the quality of the surveys underpinning the bathymetry. Historically, quality has been patchy, but is …

Control Flow Integrity For Real-Time Embedded Systems, Yuqian Huo

McKelvey School of Engineering Graduate Student Theses & Dissertations

Devices built on embedded systems are widely used in our daily lives. Nowadays, firmware typically uses C and C++ for efficiency and durability. However, those languages are unsafe which can lead to many software and system security issues. Attackers can easily corrupt a system by issuing various memory corruption attacks on a vulnerable program. Control-flow integrity is one of the most prevalent mechanisms used to protect against memory corruption. Most research papers and prototypes focus on using CFI on high-performance chips such as Intel and ARM Cortex-A. However, many embedded systems targeting time critical services are built on resource constrained …

Responses To Environmental Change, Lisa Reyes Mason, Susan P. Kemp, Lawrence A. Palinkas, Amy Krings

Social Work: School of Social Work Faculty Publications and Other Works

Communities worldwide are facing environmental crises such as air pollution, water shortages, climate change, and other forms of environmental change and degradation. While technical solutions for environmental change are essential, so too are solutions that consider social acceptability, value cultural relevance, and prioritize equity and social justice. Social work has a critical and urgent role in creating and implementing macrolevel social responses to environmental change. The key concepts of environmental change, environmental and ecological justice, social vulnerability, and social responses are discussed. A description of the roles and skills unique to macro social workers for this effort is given, followed …

Evaluating The 0–10 Point Pain Scale On Adolescent Opioid Use In Us Emergency Departments, Michael T. Phan, Daniel M. Tomaszewski, Cody Arbuckle, Sun Yang, Brooke Jenkins, Michelle A. Fortier, Theodore Heyming, Erik Linstead, Candice Donaldson, Zeev N. Kain

Pharmacy Faculty Articles and Research

Objective: To evaluate trends in national emergency department (ED) adolescent opioid use in relation to reported pain scores. Methods: A retrospective, cross-sectional analysis on National Hospital Ambulatory Medical Care Survey (NHAMCS) data was conducted on ED visits involving patients aged 11–21 from 2008–2017. Crude observational counts were extrapolated to weighted estimates matching total population counts. Multivariate models were used to evaluate the role of a pain score in the reported use of opioids. Anchors for pain scores were 0 (no pain) and 10 (worst pain imaginable). Results: 31,355 observations were captured, which were extrapolated by the NHAMCS to represent 162,515,943 …

Effective Communication And Programming When Working With Amish Farmers: Reflections From A Wisconsin Agriculture Educator, Vance Haugen

Journal of Amish and Plain Anabaptist Studies

The author, an agricultural educator who worked with the Amish in Wisconsin for over 30 years, discusses his outreach efforts, which have been focused on managed grazing, a method well suited to Amish producers. Managed grazing offers agronomic, economic, and ecological benefits. A key educational tool for communicating managed grazing practices is the pasture walk, and the author relates lessons learned from these events. The communal nature and focus on farmer-to-farmer information exchange is well received by Amish producers. It is helpful if pasture walk scheduling is done well in advance and is focused on farmer-based problems with farmer-based solutions …

Guest Editor’S Introduction: Outreach And Applied Agriculture Research With Plain Anabaptists: Lessons Learned And Future Directions, Caroline Brock

Journal of Amish and Plain Anabaptist Studies

This issue of the Journal of Amish and Plain Anabaptist Studies (JAPAS) contributes to a dearth of literature on ways to understand how plain Anabaptist culture influences agri-environmental beliefs and practices and how it informs outreach and research. Only a few studies currently focus on outreach with plain Anabaptist growers (e.g., Brock, Ulrich-Schad, and Prokopy 2018; Bergefurd 2011; Jepsen and Mann 2015; Stoltzfus 2019; Hoorman and Spencer 2001/2002). This issue of JAPAS is the first comprehensive publication to include research articles and service provider reports focusing on plain people and agriculture. This issue addresses the history of Anabaptist …

The Integration Of Art: A Multiple Case Study Of Science, Technology, Engineering, Art, And Math (Steam) Schools In Three Schools In Southern California, Reyna Esther Smith

Dissertations

Purpose: The purpose of this qualitative multi-case study was to describe and analyze how schools that implement a STEAM program include the arts in their integrated program. The study focused on 3 K-12 schools in Southern California that are located in the Antelope Valley high desert region of the state. This multi-case study analyzed an elementary school, a middle school, and a high school that are in different districts in the area.

Methodology: This multi-case study used qualitative data to analyze the research questions regarding art infusion in STEAM programs and teacher and leader perspectives. Drawing from interviews of teachers …

Myopic Oligopoly Pricing, Iwan Bos, Marco Marini, Riccardo D. Saulle

Fondazione Eni Enrico Mattei Working Papers

This paper examines capacity-constrained oligopoly pricing with sellers who seek myopic improvements. We employ the Myopic Stable Set solution concept and establish the existence of a unique pure-strategy price solution for any given level of capacity. This solution is shown to coincide with the set of pure-strategy Nash equilibria when capacities are large or small. For an intermediate range of capacities, it predicts a price interval that includes the mixed-strategy support. This stability concept thus encompasses all Nash equilibria and o ers a pure-strategy solution when there is none in Nash terms. It particularly provides a behavioral rationale for di …

Direct Foam Writing In Microgravity, Guy Jacob Cordonier, Cicely Sharafati, Spencer Mays, Lukas Thackery, Ellena Gemmen, Samuel Cyphert, Megan Brown, John Quinn Napolillo, Savannah Toney, Hunter Moore, John M. Kuhlman `, Konstantinos A. Sierros

Faculty & Staff Scholarship

Herein we report 2D printing in microgravity of aqueous-based foams containing metal oxide nanoparticles. Such hierarchical foams have potential space applications, for example for in situ habitat repair work, or for UV shielding. Foam line patterns of a TiO2-containing foam have been printed onto glass substrates via Direct Foam Writing (DFW) under microgravity conditions through a parabolic aircraft flight. Initial characterization of the foam properties (printed foam line width, bubble size, etc.) are presented. It has been found that gravity plays a significant role in the process of direct foam writing. The foam spread less over the substrate when deposited …