Digital Commons Network^™

Removel Of Polluntants From Aqueous Solution Via Graphene Oxide/Magnesium Oxide Nanocomposites, Mahdi Heidarizad

Civil and Environmental Engineering Theses and Dissertations

In this study, a series of graphene oxide/magnesium oxide nanocomposites (GO/MgO NCs) were synthesized and applied for the removal of Methylene Blue (MB) from aqueous solutions. The prepared NCs were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The results showed that MgO particles were successfully layered on GO. The impacts of different experimental variables on the removal of MB including GO/MgO NCs dosage, pH, contact time, and initial MB concentration were investigated.

Thereafter, we investigate the mechanism and kinetics of ozonation processes in the presence of GO/MgO NCs as a catalyst …

Evaluation Of The Mechanisms And Effectiveness Of Nano-Hydroxides, Wood And Dairy Manure-Derived Biochars To Remove Fluoride And Heavy Metals From Water, Anna Rose Wallace, Wenjie Sun Dr, Chunming Su Dr

Civil and Environmental Engineering Theses and Dissertations

The development of effective treatment processes for the removal contaminants, such as fluoride and heavy metals, from polluted water have been urgently needed due to serious environmental health and safety concerns. In this dissertation, a variety of materials including various (hydro)oxide nanomaterials, biochars and surface modified biochar were studied to evaluate their effectiveness and mechanism on removing fluoride or mixed heavy metals from water.

In the Chapter 2, this study investigated the adsorptive removal of fluoride from water using various (hydro)oxide nanomaterials, focusing on ferrihydrite, hydroxyapatite (HAP) and brucite, which have the potential to be used as sorbents for surface …

Failure Of High Strength Concrete Under Dynamic Uniaxial Compression, Colin Loeffler

Mechanical Engineering Research Theses and Dissertations

The failure strength of concrete materials has been widely shown to be dependent on experimental parameters such as specimen geometry and strain-rate. The effects of specimen geometry have been shown both theoretically and experimentally to be a result of the quasi-brittle nature of concrete. While the failure strength of concrete has been widely reported to increase significantly when deformed at high strain-rates, the physical mechanisms driving this phenomenon remain the source of debate amongst researchers. This means that constitutive models designed to predict this rate dependent behavior are not based on the real physical mechanisms that drive this behavior but …

Examining Three Approaches To Supporting English Learners By Leveraging Technology, Jillian Conry

Teaching and Learning Theses and Dissertations

This three-article dissertation examines three distinct approaches to supporting English learners (ELs) by leveraging technology. Framed by the third generation of cultural-historical activity theory (Engeström, 1987; 2001), this research illuminates ways different stakeholder groups within varying activity systems support ELs, by examining technology as 1) an instructional tool in the classroom, 2) a mechanism for family engagement, and 3) a means for preparing teachers to serve ELs. Types of technologies implemented in these studies include various online multimodal tools (e.g., VoiceThread, Zaption), learning management systems (e.g., EdModo, Canvas), social media platforms (e.g., Facebook, Twitter), and mixed-reality simulation (MRS; e.g., Mursion). …

Hypervalent Iodine Compounds With Carboxylate And Tetrazolate Ligands, Avichal Vaish

Chemistry Theses and Dissertations

In modern organic chemistry, hypervalent (HV) iodine(III) compounds are frequently used as oxidizing agents but application of λ³-iodanes in polymer and material chemistry is still underexplored. This dissertation describes the preparation of dynamic and self-healing materials by employing ligand exchange reactions involving HV iodine(III) compounds of the type ArIL₂ (Ar = Aryl, L = ligand, e.g., carboxylate or (pseudo)halide). These compounds can undergo ligand exchange reactions in presence of nucleophiles (Nu^-) to form ArINu₂. Diacetoxyiodo benzene was successfully employed as a crosslinker to prepare dynamic and self-healing gels derived from carboxylate-containing polymers. Furthermore, …

Cell-Trappable Chemiluminescent Probes For Monitoring Hydrogen Sulfide In Living Cells, Briley Bezner

Chemistry Theses and Dissertations

Hydrogen sulfide (H2S) is an important biological signaling molecule that has been recognized alongside nitric oxide and carbon monoxide as being a small gasotransmitter that is enzymatically produced and impacts multiple physiological functions. To detect hydrogen sulfide, there has been a focus on developing fluorescent probes to target particular analytes; however, fluorescent probes lack sensitivity and depth penetration due to background autofluorescence and light scattering. Chemiluminescence does not require light excitation, which greatly reduces the amount of autofluorescence and photoactivation.

In order to detect hydrogen sulfide in living systems with high sensitivity, a series of sterically stabilized 1,2-dioxetane chemiluminescent reduction-reaction …

“Spirited” Engagement: Latin American Faith And The Construction Of Emancipative Pentecostalism, David Luckey

Religious Studies Theses and Dissertations

Pentecostalism is a prominent form of Christianity around the world that is increasingly pervasive in the Global South. One of the persistent issues that obscures accurate understanding of the movement is the question of whether such a spiritually-oriented faith gives attention to social realities. This dissertation identifies a broad spectrum of Latin America Pentecostal social- ethical engagement in order to complicate stereotypes and reveal a natural orientation toward public witness. It shows that Pentecostalism is too complex for broad generalization, and it draws on leading voices from within the movement to articulate a call to increasing efforts for social justice.

Automating Software Changes Via Recommendation Systems, Xiaoyu Liu

Computer Science and Engineering Theses and Dissertations

As the complexity of software systems is growing tremendously, it came with increasingly sophisticated data provided during development. The systematic and large-scale accumulation of software engineering data opened up new opportunities that infer information appropriately can be helpful to software development in a given context. This type of intelligent software development tools came to be known as recommendation systems.

Recommendation Systems in Software Change (RSSCs) share commonalities with conventional recommendation systems: mainly in their usage model, the usual reliance on data mining, and in the predictive nature of their functionality. So a major challenge for designing RSSCs is to automatically …

Sample Size Considerations For Clustered And Correlated Outcomes In Clinical Research, Xiaohan Xu

Statistical Science Theses and Dissertations

In this dissertation, we investigate sample size calculations for three different study designs: stratified cluster randomization trials (CRTs), paired experimental designs and paired cluster experimental designs.

Stratified CRTs have been frequently employed in clinical and healthcare research. Comparing with simple randomized CRTs, stratified CRTs reduce the imbalance of baseline prognostic factors among different intervention groups. Clusters are often naturally formed with random sizes in CRTs. With varying cluster size, commonly used ad hoc approaches ignore the variability in cluster size, which may underestimate (overestimate) the required number of clusters for each group per stratum and lead to underpowered (overpowered) clinical …

Inference Of Heterogeneity In Meta-Analysis Of Rare Binary Events And Rss-Structured Cluster Randomized Studies, Chiyu Zhang

Statistical Science Theses and Dissertations

This dissertation contains two topics: (1) A Comparative Study of Statistical Methods for Quantifying and Testing Between-study Heterogeneity in Meta-analysis with Focus on Rare Binary Events; (2) Estimation of Variances in Cluster Randomized Designs Using Ranked Set Sampling.

Meta-analysis, the statistical procedure for combining results from multiple studies, has been widely used in medical research to evaluate intervention efficacy and safety. In many practical situations, the variation of treatment effects among the collected studies, often measured by the heterogeneity parameter, may exist and can greatly affect the inference about effect sizes. Comparative studies have been done for only one or …

Peatland Catchments And Natural Flood Management. Review Commissioned By The Iucn Uk Peatland Programme’S Commission Of Inquiry On Peatlands., T Allot, T Auñón, J Dunn, C Evans, J Labadz, P Lunt, M Macdonald, T Nisbet, R Owen, M Pilkington, S Proctor, E Shuttleworth, J Walker

School of Geography, Earth and Environmental Sciences

No abstract provided.

Assessing Magnetic Iron Oxide Nanoparticles Properties Under Different Thermal Treatments, Erick S. Vasquez, Evan M. Prehn, Keisha B. Walters

Chemical and Materials Engineering Faculty Publications

Magnetic nanoparticle structures have been examined as potential carrier vehicles and substrates in a wide range of applications where they undergo mechanical, chemical and/or thermal manipulation to allow for their modification, conjugation and transport. For safe and effective use, it is imperative to not only measure the initial physicochemical and structural properties of nanomaterials, but also identify and quantify any property changes related to a loss of chemical and/or physical integrity during processing and usage conditions. In this study an assessment of iron oxide magnetic nanoparticle thermal stability using modulated differential scanning calorimetry (mDSC) and a controlled-heating system is conducted …

Being Here And Now: The Benefits Of Belonging In Space And Time, Matthew Baldwin, Lucas A. Keefer

Faculty Publications

Research suggests that a sense of belonging is a critical prerequisite of happiness and well-being. While some have focused on belonging provided by relationships, other work demonstrates the value of belonging in certain places. In the current research we join these efforts to understand belonging by offering a novel framework for exploring an understudied but no less fundamental aspect of human experience—time. We situate this framework within an existential analysis of human action and test general predictions about the psychological value of experiencing a sense of belonging in time, what we call temporal rootedness. Two samples (Studies 1 …

Technology-Dependent Quantum Logic Synthesis And Compilation, Kaitlin Smith

Electrical Engineering Theses and Dissertations

The models and rules of quantum computation and quantum information processing (QIP) differ greatly from those that govern classical computation, and these differences have caused the implementation of quantum processing devices with a variety of new technologies. Many platforms have been developed in parallel, but at the time of writing, one method of quantum computing has not shown to be superior to the rest. Because of the variation that exists between quantum platforms, even between those of the same technology, there must be a way to automatically synthesize technology-independent quantum designs into forms that are capable of physical realization on …

Polyarylenes: Synthesis And Characterization Towards Advanced Applications, Stephen Budy

Chemistry Theses and Dissertations

A series of semi-fluorinated and non-fluorinated Diels−Alder step-growth polyarylene polymers and co-polymers were synthesized via typical oil bath heating (days/weeks) and more rapid microwave-assisted polymerization (hours). The polymers were characterized by multi-nuclear (¹H, ¹³C, and ¹⁹F) NMR and ATR−FTIR spectroscopy, thermal analysis (TGA, DSC, and DMA), GPC, XRD, water contact analysis (WCA), and refractive index (RI) measurements. The NMR spectra indicated a mixture of para and meta conformations through the polymer backbone increasing to more para with greater fluorine content. Thermal gravimetric analysis revealed the fluorine-containing polyarylenes possessed the highest char yields at almost 80% at …

Model Selection And Experimental Design Of Biological Networks With Algebraic Geometry, Anyu Zhang

Mathematics Theses and Dissertations

Model selection based on experimental data is an essential challenge in biological data science. In decades, the volume of biological data from varied sources, including laboratory experiments, field observations, and patient health records has seen an unprecedented increase. Mainly when collecting data is expensive or time-consuming, as it is often in the case with clinical trials and biomolecular experiments, the problem of selecting information-rich data becomes crucial for creating relevant models.

Motivated by certain geometric relationships between data, we partitioned input data sets, especially data sets that correspond to a unique basis, into equivalence classes with the same basis to …

Smart Factories, Dumb Policy? Managing Cybersecurity And Data Privacy Risks In The Industrial Internet Of Things, Scott J. Shackelford

Minnesota Journal of Law, Science & Technology

No abstract provided.

Authenticity In Discursive Practices Of The Online Market For Second-Hand Luxury Clothing, Ronan L. Zampier, Rita De Cássia P. Farias, Marcelo R. Pinto

The Qualitative Report

Authenticity is a particularly sensitive and salient issue in the online market for second-hand luxury clothing, and it is still little explored in the field of consumption studies. In this study we sought to analyze how authenticity is represented in discursive practices of the Brazilian online market for second-hand luxury clothing. The corpus of the work consisted of data collected through interviews in five stores of the Brazilian online market of luxury second-hand clothing. The data were analyzed using the Critical Discourse Analysis (CDA), proposed by Fairclough (1992), articulated to the sociocultural perspective of consumption. From the discursive categories Subject, …

A Need To Continue Healing: Report Of Findings From An Autoethnographic Study, David T. Culkin

The Qualitative Report

This article reviews the design and findings of an autoethnographic study on identity development over time. The researcher wanted to know how an adult can make meaning from and develop through experiences of mental illness, spiritual awareness, and death. The purpose of this autoethnographic bildungsroman was to explore how a male in the general population describes how life events have influenced his identity development over a period of 23 years, spanning three decades. The author, as the researcher-participant, asked two primary questions: (a) How does the individual describe his adult development in terms of life events or “individual and cultural …

Women's Reproductive Rights Under Marriage Contract, Sri Endah Kinasih, Toetik Koesbardiati, Siti Mas’Udah

Journal of International Women's Studies

In Indonesia, marriage contracts are still common. In addition to culture, women's reproductive rights are also strongly associated with poverty. The poverty factor is very influential in relation to quality of life and women's reproductive health. This article investigates the reproductive health rights of women under a marriage contract. Employing the descriptive qualitative method, the research was conducted in Pasuruan, East Java and Bogor, West Java, Indonesia. The selection of the research contexts was done purposively. This study shows that a marriage contract does not always imply the occurrence of sexual intercourse. Sexual intercourse in a marriage contract may happen …

Women’S Resilience In Preserving Family Life Following An Earthquake In North Lombok Regency, West Nusa Tenggara, Indonesia, Tuti Budirahayu, Anis Farida, Sughmita Maslacha Amala S.

Journal of International Women's Studies

The earthquake in Lombok, West Nusa Tenggara, in August 2018 not only damaged the environment and the area around the epicenter but also shook public order. The shaking of economic and social infrastructure is being paid for by unpreparedness in facing disasters, and this is compounded by the mental deterioration of the community due to the loss of family members. This study aims to describe women's abilities during the aftermath of the disaster, and their efforts to overcome economic and social problems within their families. We also observed women's collective efforts as a way to eliminate trauma (trauma healing). This …

Trafficking Of Women And Children In East Java, Indonesia, Sutinah Sutinah, Karen Mwende Kinuthia

Journal of International Women's Studies

This study investigated the patterns and modes of the occurrence of cases of women and child trafficking in East Java Province, Indonesia. This includes the factors that cause women to become familiar with the trade of women and children. This qualitative descriptive study was conducted in four areas of the East Java Province, known as regions, prone to have victims of trafficking. To collect the data, the researcher conducted in-depth interviews with 115 respondents: 40 commercial sex workers (PSK), 4 transnational/contract marriage victims, 45 beggars, 25 housemaids, 1 victim of child trade trafficking, and 10 concerned experts (researchers and activists …

Violence Against Women And Girls In Harare, Zimbabwe, Maybe Zengenene, Emy Susanti

Journal of International Women's Studies

This article explores the phenomenon of violence against women and girls in Harare, Zimbabwe. Section 25 of the Constitution of Zimbabwe stipulates that the State and all agencies of the government at every level must protect and foster the institutions to adopt measures for the prevention of violence. Regardless of such recognition, there have been rampant incidences of politically motivated and domestic violence against women and girls in the country. Domestic violence against women and girls is a violation of the Constitution of Zimbabwe and all of the treaties, conventions, charters and optional protocols on the rights of women. Owing …

Achievement Of Gender Mainstreaming In Islamic Schooling Based On The National Education Standard In Indonesia, Riswani Riswani, Rita Susanti, Nurhasanah Bakhtiar, Masud Zein, Eniwati Khaidir, Musa Taher

Journal of International Women's Studies

One of the policies which has been issued by the Indonesian government regarding madrasah (Islamic schooling) is the Government Regulation (PP) No 11 of 2010 on Guidelines for Gender Mainstreaming (Pengarusutamaan Gender-PUG) in Madrasah of the Ministry of Religion of the Republic of Indonesia. The issuance of this policy is an attempt to eliminate the “gender gap” that occurs in madrasah. For almost two decades, it has been issued, but the gender gap still occurs in madrasah. This is shown from the results of several previous studies. However, all of the previous studies on the achievement of PUG in madrasah …

Urbanization And Population Growth: Projected Impacts Of Growth On Ecological Resources In Ontario1, Laura J. Bozzelli

International ResearchScape Journal

No abstract provided.

Review Of Science In The Archives: Pasts, Presents, Futures, Emily A. Graham

Journal of Contemporary Archival Studies

A collection of essays written by members of the Archives of the Sciences Working Group at the Max Planck Institute for the History of Science, Science in the Archives: Pasts, Presents, Futures leads the reader on an exploration of the history of data preservation, data management, and information organization in the sciences. This review examines the themes connecting the essays and considers how researchers and historians of science understand the meaning of archives.

Return-Oriented Programming Detection And Prevention Utilizing A Hardware And Software Adaptation, Alex Levin

Defensive Publications Series

This publication describes techniques aimed at detecting and preventing return-oriented programming (ROP) attacks. The techniques consist of a software adaptation which enables supplemental hardware, specifically a system on a chip (SoC), to chronologically log return (ret) addresses of pushed stack frames and compare those logged ret addresses to ret commands executed by a central processing unit (CPU) of a computing system. When the SoC determines that ret commands executed by the CPU have deviated from the logged ret addresses, then the SoC can take action to thwart a ROP attack.

Newsletter: Network News, Jacksonville Women's Network

Saffy Collection - All Textual Materials

A newsletter for Jacksonville Women’s Network with information on the JWN board, members and events. Date: April 1993

Strategies Exemplary Female Superintendents Use To Work With The Political Styles Of School Board Members, Leisa Winston

Dissertations

Purpose: The purpose of this explanatory mixed-methods study was to identify the political styles of female superintendents and their school board members as perceived by superintendents. In addition, it was the purpose of this study to identify and explain the political strategies female superintendents use to work with the different political styles of board members.

Methodology: This study employed a sequential, explanatory mixed-methods design. The quantitative data were collected through surveys to identify the political styles of superintendents and their board members. The qualitative interview data explored the political strategies used by each superintendent with the different political styles of …

Impact Of Positive Behavioral Interventions And Supports In California High Schools Year Three And Beyond: A Semi-Replicated Mixed-Methods Study, Jolene Mcgarrah

Dissertations

Purpose: The purpose of this mixed-methods study was to determine what differences

existed between pre- and post-PBIS implementation on suspension rates in California high schools. A further purpose of the study was to determine how experienced high school administrators described the impact of PBIS on their school sites. Methodology: This mixed methods study identified 15 California public schools for data collection and five principals for interviews about their perceptions of the impact of PBIS on their campus. The schools and principals were chosen due to proximity to the researcher. The researcher collected quantitative data from the schools and qualitative data …