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Articles 11551 - 11580 of 12617
Full-Text Articles in Physical Sciences and Mathematics
A New Design Method For Vanadium Redox Batteries In Renewable Energy Systems, Casey Gibson, Karla G. Morrissey Unversity Of Arkansas, Fayetteville
A New Design Method For Vanadium Redox Batteries In Renewable Energy Systems, Casey Gibson, Karla G. Morrissey Unversity Of Arkansas, Fayetteville
Inquiry: The University of Arkansas Undergraduate Research Journal
This study investigated the behavior of vanadium redox flow batteries (VRFBs), which are batteries capable of easily switching between charging and discharging modes, making them a suitable option for storing intermittent sources of alternative energies (solar, wind, etc). Since different sizes of the battery provide varying voltages, optimal parameters for a particular home are key for implementation. These parameters, specifically the cell and tank volumes of the battery that are capable of providing consistent on-load voltage, were determined using data from a 13 kW solar array and a medium-sized house. Charge/discharge current values were used to run a mathematical model …
Impact Of Environmentally Friendly Packaging On Consumers’ Attitudes And Patronage Intentions Toward Apparel Retail Brands, Madalyn M. Smith, Eunjoo Cho
Impact Of Environmentally Friendly Packaging On Consumers’ Attitudes And Patronage Intentions Toward Apparel Retail Brands, Madalyn M. Smith, Eunjoo Cho
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences
Consumer interest in social responsibility (SR) has greatly increased in recent years. Providing environmentally friendly packaging (recycled and reusable bags) is one example of how apparel retail brands can engage in SR. The objective of this research was to explore the impact of using environmentally friendly packaging on consumers’ attitudes and patronage intentions toward apparel retail brands. To conduct this research, undergraduate and graduate students from a major mid-Southern university completed an online survey testing consumers’ perceptions, environmental consciousness, attitudes, and patronage intentions. Results from this study revealed that young consumers’ perceptions of environmentally friendly packaging has a positive impact …
Differential Incision And Uplift Of The Yakima River Terraces, Adrian M. Bender
Differential Incision And Uplift Of The Yakima River Terraces, Adrian M. Bender
WWU Graduate School Collection
The Yakima fold belt comprises fault-related folds deforming Miocene basalts and younger deposits of the Columbia Plateau in central Washington State. Geodesy implies ~2 mm/yr of modern, NNE-directed regional shortening; however the distribution of Quaternary deformation among individual structures remains unclear. South of Ellensburg, Washington, the Yakima River cuts a ~600-m deep canyon across several of the folds, preserving flights of strath terraces that record the progressive incision. Graded alluvial basins at the head and mouth of the canyon imply that terrace incision also records differential rock uplift. We integrate lidar analysis, field observations, and cosmogenic burial dating of eight …
Thermal Degradation Of Amines For Co2 Capture, Quanzhen Huang
Thermal Degradation Of Amines For Co2 Capture, Quanzhen Huang
Theses and Dissertations--Chemistry
In the selection of candidates for CO2 absorption, solvent thermal degradation has become a general concern due to the significant impact on operational cost and the intention to use thermal compression from high temperature stripping to minimize the overall process energy. In this research, the impact of flue gas contaminants on Monoethanolamine (MEA) thermal degradation was investigated at elevated temperatures consistent with those in the CO2 stripper. Nitrite, fly ash, sulfate and thiosulfate were each added to 5.0 M MEA and the contaminant-containing MEA solutions were degraded at 125 °C, 135 °C and 145 °C. MEA degrades significantly …
Development Of An Extraction Method For The Mass Spectral Analysis Of Organic Gunshot Residue From Clothing, Brent Casper
Development Of An Extraction Method For The Mass Spectral Analysis Of Organic Gunshot Residue From Clothing, Brent Casper
Theses and Dissertations--Chemistry
This dissertation will focus on the extraction of volatile organic compounds associated with gunshot residue from articles of clothing, followed by analysis with mass spectrometry. During the discharge of a weapon, a cloud of volatile organic gunshot residue (OGSR) is dispersed around a firearm. This will create a high probability of transfer between the OGSR and the clothing of individuals who are near a discharged weapon.
The first part of this dissertation will be the development of a method for removal of volatile OGSR from articles of clothing. Extraction of OGSR will be completed by solid phase microextraction (SPME), followed …
Ferrocene-Fused Derivatives Of Acenes, Tropones And Thiepins, Bidhya L. Maharjan
Ferrocene-Fused Derivatives Of Acenes, Tropones And Thiepins, Bidhya L. Maharjan
Theses and Dissertations--Chemistry
This research project is concentrated on tuning the properties of small organic molecules, namely polyacenes, tropones and thiepins, by incorporating redox-active transition metal centers π-bonded to terminal cyclopentadienyl ligands. Organometallic-fused acenequinones, tropones, thiepins and cyclopentadiene-capped polyacenes were synthesized and characterized. This work was divided into three parts: first, the synthesis of ferrocene-fused acenequinones, cyclopentadiene-capped acenequinones and their subsequent aromatization to polyacenes; second, the synthesis of ferrocene-fused tropones, thiotropones and tropone oxime; and third, the synthesis of ferrocene-fused thiepins. Ferrocene-fused quinones are the precursors to our target complexes. Our synthetic route to ferrocenequinones involved two-fold aldol condensation between 1,2-diformylferrocene and naphthalene-1,4-diol …
Plasma Treated Mesoporous Tio2 Thin Films For Energy Storage Applications, Allen D. Reed
Plasma Treated Mesoporous Tio2 Thin Films For Energy Storage Applications, Allen D. Reed
Theses and Dissertations--Chemistry
Mesoporous TiO2 films treated with N2/argon plasma or H2 plasma were studied for use in photoelectrochemical water splitting and electrochemical supercapacitors, respectively. Cubic-ordered mesoporous thin films were prepared by a templated sol-gel method. UV-Vis absorbance spectra indicated that nitrogen plasma treatment significantly reduced the band gap of the TiO2. XPS analysis showed that nitrogen atoms are incorporated into substitutional sites, rather than interstitial. Photocatalytic activity of nitrogen-doped TiO2 films was evaluated by chronoamperometry and linear sweep voltammetry. Compared to pristine TiO2, plasma-treated films showed remarkable photocurrent enhancement (up to 240 times) …
Spectroscopic Characterization Of Lanthanum-Mediated Hydrocarbon Activation, Dilrukshi C. Hewage
Spectroscopic Characterization Of Lanthanum-Mediated Hydrocarbon Activation, Dilrukshi C. Hewage
Theses and Dissertations--Chemistry
Lanthanum (La)-promoted hydrocarbon activation reactions were carried out in a laser vaporization metal cluster beam source. Reaction products were identified by time-of-flight mass spectrometry, and the approximate ionization thresholds of La-hydrocarbon complexes were located with photoionization efficiency spectroscopy. The accurate ionization energies and vibrational frequencies of the La complexes were measured using mass analyzed threshold ionization (MATI) spectroscopy. Their molecular structures and electronic states were investigated by combing the MATI spectroscopic measurements with quantum chemical and Franck-Condon factor calculations.
In this dissertation, La-mediated C-H and C-C bond activation reactions were investigated for several small alkynes (acetylene, propyne) and alkenes (propene, …
Data Breach (Regulatory) Effects, David Thaw
Noble Metal Free Catalysts For Hydrogen Generation From Aqueous Solutions, Dan Liu
Noble Metal Free Catalysts For Hydrogen Generation From Aqueous Solutions, Dan Liu
Dissertations, Theses, and Masters Projects
The current energy crisis is becoming more and more serious due to the industrial development and increasing population. Mimicking photosynthesis in plants provides a new way to solve this crisis. The goal is to harness solar energy and convert it into energy stored in chemical bonds such as methanol or hydrogen gas. Currently, most catalysts for proton reduction contain precious metals, such as palladium, platinum and ruthenium. The main goal of our research is to develop catalysts made of earth abundant metals. By incorporating organic ligands in our complexes, we can make catalysts that have similar catalytic activity as those …
Imaging The Dipole-Dipole Energy Exchange Between Ultracold Rubidium Rydberg Atoms, Donald Fahey, Thomas J. Carroll, Michael W. Noel
Imaging The Dipole-Dipole Energy Exchange Between Ultracold Rubidium Rydberg Atoms, Donald Fahey, Thomas J. Carroll, Michael W. Noel
Physics Faculty Research and Scholarship
The long-range, anisotropic nature of the interaction among atoms in an ultracold dipolar gas leads to a rich array of possibilities for studying many-body physics. In this work, an ultracold gas of highly excited atoms is used to study energy transport due to the long-range dipole-dipole interaction. A technique is developed to measure both the internal energy states of the interacting Rydberg atoms and their positions in space. This technique is demonstrated by observing energy exchange between two spatially separated groups of Rydberg atoms excited to two different internal states. Simulations confirm the general features of the energy transport in …
Permutation Entropy And Statistical Complexity Analysis Of Turbulence In Laboratory Plasmas And The Solar Wind, P. J. Weck, David A. Schaffner, M. R. Brown
Permutation Entropy And Statistical Complexity Analysis Of Turbulence In Laboratory Plasmas And The Solar Wind, P. J. Weck, David A. Schaffner, M. R. Brown
Physics Faculty Research and Scholarship
The Bandt-Pompe permutation entropy and the Jensen-Shannon statistical complexity are used to analyze fluctuating time series of three different turbulent plasmas: the magnetohydrodynamic (MHD) turbulence in the plasma wind tunnel of the Swarthmore Spheromak Experiment (SSX), drift-wave turbulence of ion saturation current fluctuations in the edge of the Large Plasma Device (LAPD), and fully developed turbulent magnetic fluctuations of the solar wind taken from the Wind spacecraft. The entropy and complexity values are presented as coordinates on the CH plane for comparison among the different plasma environments and other fluctuation models. The solar wind is found to have the highest …
Magnetohydrodynamic Turbulence: Observation And Experiment, M. R. Brown, David A. Schaffner, P. J. Weck
Magnetohydrodynamic Turbulence: Observation And Experiment, M. R. Brown, David A. Schaffner, P. J. Weck
Physics Faculty Research and Scholarship
We provide a tutorial on the paradigms and tools of magnetohydrodynamic (MHD) turbulence. The principal paradigm is that of a turbulent cascade from large scales to small, resulting in power law behavior for the frequency power spectrum for magnetic fluctuations EB(f) . We will describe five useful statistical tools for MHD turbulence in the time domain: the temporal autocorrelation function, the frequency power spectrum, the probability distribution function of temporal increments, the temporal structure function, and the permutation entropy. Each of these tools will be illustrated with an example taken from MHD fluctuations in the solar wind. A single dataset …
Nonexponential 1h Spin-Lattice Relaxation And Methyl Group Rotation In Molecular Solids, Peter A. Beckmann
Nonexponential 1h Spin-Lattice Relaxation And Methyl Group Rotation In Molecular Solids, Peter A. Beckmann
Physics Faculty Research and Scholarship
We report a quantitative measure of the nonexponential 1H spin-lattice relaxation resulting from methyl group (CH3) rotation in six polycrystalline van der Waals solids. We briefly review the subject in general to put the report in context. We then summarize several significant issues to consider when reporting 1H or 19F spin-lattice relaxation measurements when the relaxation is resulting from the rotation of a CH3 or CF3 group in a molecular solid.
Quantum Interference In The Field Ionization Of Rydberg Atoms, Rachel Feynman, Jacob Hollingsworth, Michael Vennettilli, Tamas Budner, Ryan Zmiewski, Donald Fahey, Thomas J. Carroll, Michael W. Noel
Quantum Interference In The Field Ionization Of Rydberg Atoms, Rachel Feynman, Jacob Hollingsworth, Michael Vennettilli, Tamas Budner, Ryan Zmiewski, Donald Fahey, Thomas J. Carroll, Michael W. Noel
Physics Faculty Research and Scholarship
We excite ultracold rubidium atoms in a magneto-optical trap to a coherent superposition of the three |mj | sublevels of the 37d5/2 Rydberg state. After some delay, during which the relative phases of the superposition components can evolve, we apply an electric field pulse to ionize the Rydberg electron and send it to a detector. The electron traverses many avoided crossings in the Stark levels as it ionizes. The net effect of the transitions at these crossings is to mix the amplitudes of the initial superposition into the same final states at ionization. Similar to a Mach-Zehnder interferometer, the three …
Methoxy And Methyl Group Rotation: Solid State Nmr 1h Spin-Lattice Relaxation, Electronic Structure Calculations, Xray Diffractometry, And Scanning Electron Microscopy, Peter A. Beckmann, Clelia W. Mallory, Frank B. Mallory, Arnold L. Rheingold, Xianlong Wang
Methoxy And Methyl Group Rotation: Solid State Nmr 1h Spin-Lattice Relaxation, Electronic Structure Calculations, Xray Diffractometry, And Scanning Electron Microscopy, Peter A. Beckmann, Clelia W. Mallory, Frank B. Mallory, Arnold L. Rheingold, Xianlong Wang
Physics Faculty Research and Scholarship
We report solid-state (1) H nuclear magnetic resonance (NMR) spin-lattice relaxation experiments, X-ray diffractometry, field-emission scanning electron microscopy, and both single-molecule and cluster ab initio electronic structure calculations on 1-methoxyphenanthrene (1) and 3-methoxyphenanthrene (2) to investigate the rotation of the methoxy groups and their constituent methyl groups. The electronic structure calculations and the (1) H NMR relaxation measurements can be used together to determine barriers for the rotation of a methoxy group and its constituent methyl group and to develop models for the two coupled motions.
Extremal Theorems For Degree Sequence Packing And The Two-Color Discrete Tomography Problem, Jennifer Diemunsch, Michael Ferrara, Sogol Jahanbekam, James Shook
Extremal Theorems For Degree Sequence Packing And The Two-Color Discrete Tomography Problem, Jennifer Diemunsch, Michael Ferrara, Sogol Jahanbekam, James Shook
Faculty Publications
No abstract provided.
Fail-Safe Testing Of Web Applications, Salah Boukhris
Fail-Safe Testing Of Web Applications, Salah Boukhris
Electronic Theses and Dissertations
This dissertation introduces an approach to generate tests to test fail-safe behavior for web applications. We apply the approach to a commercial web application. We build models for both behavioral and mitigation requirements. We create mitigation tests from an existing functional black box test suite by determining failure type and points of failure in the test suite and weaving required mitigation based on weaving rules to generate a test suite that tests proper mitigation of failures. A genetic algorithm (GA) is used to determine points of failure and type of failure that needs to be tested. Mitigation test paths are …
Economic And Traffic Impacts Following The Installation Of New Bicycle Facilities: A Denver Case Study, Stephen Antonio Rijo
Economic And Traffic Impacts Following The Installation Of New Bicycle Facilities: A Denver Case Study, Stephen Antonio Rijo
Electronic Theses and Dissertations
America is currently experiencing a unique departure from the historical vehicle miles traveled (VMT) trend, often referred to as "peak travel." Decreasing VMT numbers suggest that the US is currently experiencing an unprecedented change in the way individuals utilize transportation systems. The following research calls on a need to understand the importance of improving alternative transportation infrastructure, namely cycling facilities, and how this impacts local businesses and their communities. This research informs the overarching question, "What are the economic and traffic impacts of cycling facilities?" A mixed methods analysis of retail sales tax, traffic count, and RTD transit access data …
Technology And Legal Research: What Is Taught And What Is Used In The Practice Of Law, Rebecca Sewanee Trammell
Technology And Legal Research: What Is Taught And What Is Used In The Practice Of Law, Rebecca Sewanee Trammell
CCE Theses and Dissertations
Law schools are criticized for graduating students who lack the skills necessary to practice law. Legal research is a foundational ability necessary to support lawyering competency. The American Bar Association (ABA) establishes standards for legal education that include a requirement that each law student receive substantial instruction in legal skills, including legal research. Despite the recognized importance of legal research in legal education, there is no consensus of what to teach as part of a legal research course or even how to teach such a course.
Legal educators struggle to address these issues. The practicing bar and judiciary have expressed …
Interpretative Phenomenological Analysis Of Accessibility Awareness Among Faculty In Online Learning Environments, Rachael Sessler Trinkowsky
Interpretative Phenomenological Analysis Of Accessibility Awareness Among Faculty In Online Learning Environments, Rachael Sessler Trinkowsky
CCE Theses and Dissertations
Although all organizations and institutions should consider accessibility when developing online content, inaccessibility is a recurring issue in recent literature pertaining to online learning environments (OLEs) and faculty accessibility awareness. The goal was to describe how online faculty gain knowledge regarding accessibility, to explore the lived experiences of online faculty who have worked with students who have disabilities, and to gain a better understanding of how faculty experience the process of accessibility implementation. The following research questions guided this study: How do faculty in OLEs experience encounters regarding accessibility for students who have print related disabilities? How do faculty in …
Feature Selection And Classification Methods For Decision Making: A Comparative Analysis, Osiris Villacampa
Feature Selection And Classification Methods For Decision Making: A Comparative Analysis, Osiris Villacampa
CCE Theses and Dissertations
The use of data mining methods in corporate decision making has been increasing in the past decades. Its popularity can be attributed to better utilizing data mining algorithms, increased performance in computers, and results which can be measured and applied for decision making. The effective use of data mining methods to analyze various types of data has shown great advantages in various application domains. While some data sets need little preparation to be mined, whereas others, in particular high-dimensional data sets, need to be preprocessed in order to be mined due to the complexity and inefficiency in mining high dimensional …
An Investigation Of The Factors Contributing To The Development Of Poorly Defined Is Strategies For Firms In The United States, Karen B. Lacaden
An Investigation Of The Factors Contributing To The Development Of Poorly Defined Is Strategies For Firms In The United States, Karen B. Lacaden
CCE Theses and Dissertations
Although empirical research has shown that a clearly defined information system (IS) strategy has a positive impact to a firm’s performance and a poorly defined IS strategy has a negative impact to a firms’ performance, firms still develop poorly defined IS strategies. Further compounding the problem, research has revealed that 87% of the business executives believe information systems are a critical enabler to their firms' strategic realization, yet only 33% of business executives involve the Chief Information Officer (CIO) in their firm’s business strategy development. The main goal of this research study is to empirically identify factors which impact development …
An Electroencephalogram (Eeg) Based Biometrics Investigation For Authentication: A Human-Computer Interaction (Hci) Approach, Ricardo J. Rodriguez
An Electroencephalogram (Eeg) Based Biometrics Investigation For Authentication: A Human-Computer Interaction (Hci) Approach, Ricardo J. Rodriguez
CCE Theses and Dissertations
Encephalogram (EEG) devices are one of the active research areas in human-computer interaction (HCI). They provide a unique brain-machine interface (BMI) for interacting with a growing number of applications. EEG devices interface with computational systems, including traditional desktop computers and more recently mobile devices. These computational systems can be targeted by malicious users. There is clearly an opportunity to leverage EEG capabilities for increasing the efficiency of access control mechanisms, which are the first line of defense in any computational system.
Access control mechanisms rely on a number of authenticators, including “what you know”, “what you have”, and “what you …
Determinants Of Intention To Use New Technology: An Investigation Of Students In Higher Education, Yolanda Dupree
Determinants Of Intention To Use New Technology: An Investigation Of Students In Higher Education, Yolanda Dupree
CCE Theses and Dissertations
The federal government continues to monitor the cost of paper texts as an essential component of postsecondary education expenses. The Higher Education Act (HEA), which was initially passed in 1965, was created to buttress the educational resources of colleges and universities. Along with addressing the benefits of financial aid in postsecondary and higher education, the act referenced the projected financial burdens of paper texts. The last 2008 reauthorization suggested that colleges and universities develop plans to reduce the costs of college. Congress is currently working to reauthorize the legislation. Based on this information, the problem identified in this study explored …
Approaches For Developing A Model For Information And Communication Technology (Ict) Implementation In The Higher Education Environment, Thomas Edward Kurtz
Approaches For Developing A Model For Information And Communication Technology (Ict) Implementation In The Higher Education Environment, Thomas Edward Kurtz
CCE Theses and Dissertations
This dissertation investigates approaches for the development of an implementation model for ICT systems in the higher education environment. ICT systems have been implemented in various education settings, but have been narrowly focused in nature. There lacks a generalizable model to implement these systems in higher education settings. The research questions in this study sought to identify the criteria that can be used to develop and evaluate the implementation model.
The design science research methodology selected for this study used product criteria defined in a literature review to guide the development of the model. An expert panel consisting of administrators, …
Characterization Of Prose By Rhetorical Structure For Machine Learning Classification, James Java
Characterization Of Prose By Rhetorical Structure For Machine Learning Classification, James Java
CCE Theses and Dissertations
Measures of classical rhetorical structure in text can improve accuracy in certain types of stylistic classification tasks such as authorship attribution. This research augments the relatively scarce work in the automated identification of rhetorical figures and uses the resulting statistics to characterize an author's rhetorical style. These characterizations of style can then become part of the feature set of various classification models.
Our Rhetorica software identifies 14 classical rhetorical figures in free English text, with generally good precision and recall, and provides summary measures to use in descriptive or classification tasks. Classification models trained on Rhetorica's rhetorical measures paired with …
Motivations Of Students In The Open-Ended Use Of Mobile Computing In Lecture-Based Classrooms, Jeffrey Kimball
Motivations Of Students In The Open-Ended Use Of Mobile Computing In Lecture-Based Classrooms, Jeffrey Kimball
CCE Theses and Dissertations
While research supports the integration of mobile computing into instruction, there is disagreement concerning the unstructured use of mobile devices in lecture-based college classrooms. Research supports the argument that unstructured use creates distraction and decreased academic performance. Research also suggests that unstructured use actually supports lecture instruction through personalized learning situations. In either case, the motivations of students to use mobile device is often unclear. This study sought to investigate the motivations for students’ acceptance of mobile devices. The Unified Theory of Acceptance and Use of Technology (UTAUT) was utilized to identify the factors leading to college students’ adoption of …
Identifying Key Determinants Of Service Provider Effectiveness And The Impact It Has On Outsourced Security Success, James B. Lewis
Identifying Key Determinants Of Service Provider Effectiveness And The Impact It Has On Outsourced Security Success, James B. Lewis
CCE Theses and Dissertations
The purpose of this research was to identify key determinants of service provider effectiveness and how it impacts outsourced security success. As environments have become more robust and dynamic, many organizations have made the decision to leverage external security expertise and have outsourced many of their information technology security functions to Managed Security Service Providers (MSSPs).
Information Systems Outsourcing, at its core, is when a customer chooses to outsource certain information technology functions or services to a service provider and engages in a legally binding agreement. While legal contracts govern many aspects of an outsourcing arrangement, it cannot serve as …
Examining The Security Awareness, Information Privacy, And The Security Behaviors Of Home Computer Users, Keith Edwards
Examining The Security Awareness, Information Privacy, And The Security Behaviors Of Home Computer Users, Keith Edwards
CCE Theses and Dissertations
Attacks on computer systems continue to be a problem. The majority of the attacks target home computer users. To help mitigate the attacks some companies provide security awareness training to their employees. However, not all people work for a company that provides security awareness training and typically, home computer users do not have the incentive to take security awareness training on their own. Research in security awareness and security behavior has produced conflicting results. Therefore, it is not clear, how security aware home computer users are or to what extent security awareness affects the security behavior of home computer users. …