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Characterizations Of Eco-Friendly Class C Fly Ash-Based Alkali-Activated Mixtures For Various 3d-Printing Techniques, Fareh Abudawaba

Doctoral Dissertations

This study explored the potential of using high-calcium class C fly ash (FA) as the main precursor for synthesizing alkali-activated mortar (AAM) suitable for 3D-printed concrete (3DPC) applications. The objective was to broaden the selection of AAMs, designed to suit various printing techniques, including continuous mixing and pumping, large batch mixing, and set-on-demand processes. The study began by assessing the fresh properties of various mixtures, utilizing tests such as open time (OT), initial setting time (IST), immediate axial deformation, and penetration test (PT), to determine the mixtures' extrudability and buildability. The study optimized mixtures with a broad spectrum of cycle …

Development Of Catalytic Membranes And Composites For Energy Storage Devices And Nonenzymatic Biosensors, Harish Singh

Doctoral Dissertations

The excessive use of fossil fuels has led to their rapid depletion, causing an energy crisis and environmental issues. Consequently, there's a growing focus on sustainable energy conversion. Electrocatalysts are pivotal in this development, particularly for fuel cells and solar fuel generators, necessitating high-efficiency, cost-effective catalysts for large-scale adoption. Transition metal chalcogenides have emerged as promising electrocatalysts due to their high efficiency, electrochemical tunability, and abundant active sites. This work is divided in two parts. In Part A, we have investigated transition metal chalcogenide and few atom clusters FACs as electrocatalysts for oxygen evolution and reduction, highlighting their structure-property relationships …

The Structure, Properties And Dissolution Behaviors Of Phosphate Glasses, Han Zhang

Doctoral Dissertations

The poor chemical durability remains a critical challenge for the application of phosphate glasses. This study investigates the compositional influences on the structure, properties and chemical durability of Li2O-ZnO-P₂O₅ glasses. Their structural characteristics were analyzed utilizing high-performance liquid chromatography, Raman spectroscopy, and X-ray photoelectron spectroscopy. The incorporation of (Li2O+ZnO) in LZeq glasses depolymerizes the phosphate network. In LZ40P and LZ45P glasses, Li⁺ initially replaces Zn²⁺ associated with non-bridging oxygens (NBOs) in Q² tetrahedra. Once the substitution in Q² is complete, further Li⁺ incorporation leads to the replacement of Zn²⁺ in Q^{1 …}

Epitaxial Growth Of Metal-Organic Framwork Thin Films By Electro-Conversion And Electrodeposition, Xiaoting Zhang

Doctoral Dissertations

Electrochemical epitaxy is a facile and inexpensive soft-solution process to fabricate highly ordered thin films. This research focuses on the epitaxial growth of metal-organic framework (MOF) thin films by electrochemical methods which include electro-conversion and electrodeposition.

First, an electrochemical conversion pathway was invented to achieve epitaxial MOF thin films. Epitaxial single-domain Cu-BTC(111) thin films were manufactured by electrochemical oxidation of Cu₂O(111) films electrodeposited on single-crystal Au(111). The single-crystal-like Cu-BTC(111) thin films with out-of-plane and in-plane order provide well-aligned 3.5 Å triangular windows along the [111] direction. Cu-BTC(111) foils were fabricated from the Cu-BTC/Cu₂O system by electrochemical …

Products Of Laser Ablated Actinides And Actinide Comparators In The Presence Of Carbonyl Sulfide Characterized By Rotational Spectroscopy, Joshua Edward Isert

Doctoral Dissertations

As the consumption of energy continues to rise globally, so too has interest in alternative energy sources such as nuclear power. However, a fundamental understanding of the actinide series is needed in order to safely and efficiently utilize these elements. Rotational or microwave spectroscopy, depending on if one is speaking of the physical outcome of the experiment or the region of the electromagnetic spectrum being operated in, is a gas phase molecular study utilized for structural determination. This technique can be utilized to gain an in depth understanding of bonding within the actinide series. However, when studying species that are …

Synthesis Of Graphene Using Carbonaceous Materials In An Ultrasonic Reactor, Paul Chukwuma Ani

Doctoral Dissertations

The synthesis of high-quality graphene from sustainable carbonaceous feedstocks offers an avenue to reduce the environmental and economic costs associated with conventional graphite-based production. This research investigates the co-utilization of biochar and graphite as precursors for graphene fabrication in an ultrasonic reactor. Biochar was produced from biomass via downdraft gasification at 850 °C, yielding a high fixed-carbon, partially graphitized material with favorable surface area and porosity. Graphite, selected for its crystalline structure, was investigated with biochar to assess the influence of precursor composition on exfoliation efficiency, layer thickness distribution, and defect density. Ultrasonic-assisted liquid-phase exfoliation was employed, with process parameters …

Radio Frequency Wave Propagation Modeling Within Obstructed Underground Mining Environments For Effective Miner Localization During Mine Emergencies, Emmanuel Atta Antwi

Doctoral Dissertations

The reliability of underground wireless communication systems remains a significant challenge, particularly during emergencies when the mine environment becomes severely obstructed by debris, dust, and humidity. These environmental and geometric conditions result in significant attenuation of electromagnetic (EM) waves and multipath effects that undermine miner localization and rescue operations. Existing Vector Parabolic Equation (VPE) models are efficient for straight or mildly curved tunnels but fail to account for the random and obstructive conditions typically encountered during underground emergencies. This research develops a novel radio propagation model for EM wave behavior in underground mine drifts under geometrically obstructed conditions. The model …

Political Elites And Attitudes Toward International Organizations In The Trump Era, Ping Xu, Nina Küssau, Ashlea Rundlett, Brendan Skip Mark, Caroline Fowler, Brian Krueger

Political Science Faculty Publications

Objective: This study examines how political elites influence public opinion on international organizations (IOs), focusing on the impact of President Donald Trump's rhetoric on attitudes toward the World Health Organization (WHO), UN, and North Atlantic Treaty Organization (NATO).

Methods: Using data from the 2020 American National Election Studies (ANES), we analyze the relationship between Trump support, political knowledge, and public evaluations of these IOs.

Results: We find a significant “Trump effect” on attitudes toward all three IOs. Trump supporters exhibited significantly lower evaluations of the WHO, UN, and NATO. Moreover, highly knowledgeable Trump supporters were even more …

“Immigrationalization” Of The Welfare State: Contextual Influences On Welfare Politics In The United States, Ping Xu, Belinda Davis, James Garand

Political Science Faculty Publications

While prior studies have consistently linked immigration attitudes with public support for the welfare state, it is not yet clear how individuals process immigrant-related information in their home contexts and combine that with their existing immigration attitudes to update their attitudes toward the welfare state. In this paper, we consider how context (i.e., immigrant welfare participation rates in individuals’ home states) works in tandem with immigration attitudes to shape Americans’ support for the welfare state. We merge state contextual data on the welfare consumption rates of immigrants with micro-level public opinion data from the Cumulative American National Election Survey (CANES) …

Genetic Diversity And Population Structure Of Tomato (Solanum Lycopersicum) From The Usda-Grin Germplasm Collection, Ibtisam Alatawi, Haizheng Xiong, Hanan Mohammedsaeed Alkabkabi, Kenani Chiwina, Qun Luo, Kai-Shu Ling, Yuejun Qu, Renjie Du, Ainong Shi

Horticulture Faculty Publications and Presentations

The genetic diversity and population structure of tomato (Solanum lycopersicum) were investigated to support breeding strategies and germplasm conservation. A total of 276 accessions from the USDA-GRIN collection were analyzed using single-nucleotide polymorphisms (SNPs) generated through genotyping by sequencing (GBS). After stringent filtering, 5162 high-quality polymorphic SNPs were retained for analysis. Population structure analysis revealed three distinct genetic groups (Q1, Q2, and Q3) among the accessions. Accessions from the USA, Asia, and Central and South America were assigned to all three groups, while accessions from Europe and Oceania were predominantly clustered within Q2. Genetic diversity indices, including major allele frequency, …

Artificial Intelligence In Warfare: The Case Of The Russia-Ukraine War, Baurzhan Rakhmetov, Kamila Murzagulova

Journal of Strategic Security

The last decade has marked the rise and integration of artificial intelligence (AI) across various spheres. Nowadays, militaries worldwide apply AI to optimize and revolutionize warfighting tactics. The war in Ukraine has shown how AI-driven technologies enhance traditional military equipment, such as by automating drone take-off, landing, and even targeting. Moreover, AI has begun to play a crucial role in information warfare, enabling both sides to manipulate public opinion, destabilize adversaries, and mislead populations, but also counter disinformation. This qualitative study analyzes the approach to AI integration in information and kinetic warfare by both sides of the Russia-Ukraine conflict, forecasts …

Energy Weaponization In The Ukraine–Russia War: Sanctions, Rerouting Flows, And Implications For Smaller States, Aysel Quliyeva

Journal of Strategic Security

The 2022 Russian invasion of Ukraine intensified the use of energy as a geopolitical weapon, transforming global energy markets and testing the resilience of states dependent on Russian oil and gas. This study examines the mechanisms of energy weaponization in the context of the Ukraine-Russia war, with particular emphasis on sanctions, the rerouting of energy flows, and the strategic implications for smaller states. Drawing on the theoretical frameworks of energy security, hybrid warfare, and small-state vulnerability, the paper integrates policy analysis with trade and price data from 2014 to 2024. The findings reveal that sanctions accelerated Russia’s eastward energy pivot, …

Manteño Landscape In Construction: Geoarchaeology In The Cloud Forest, Coastal Ecuador, Janny Mauricio Velasco

Electronic Theses and Dissertations 2020 - Present

This research explores archaeological soil micromorphology as an experimental method for studying the effects of intensive landscape transformation in the Manteño inland urban clusters of the Las Tusas River Valley of Rio Blanco, Manabi, Ecuador. Specifically, during this period, the Manteño society expanded its influence along the Ecuadorian littoral, incorporating the cloud forest of the Chongón Colonche cordillera as part of its settlement strategy. Micromorphology could provide detailed information about the cultural processes that formed the soil structure of the archaeological midden of N4C4-044. This work presents the results of soil micromorphology in a Neotropical Forest of Central Coastal Ecuador, …

An Evidence-Based Consensus For The Use Of Neurostimulation For The Treatment Of Non-Surgical Low Back Pain: The Neuron Group., Timothy Ray Deer, Jason E Pope, Erika A Petersen, Rany T Abdallah, Kasra Amirdelfan, Nomen Azeem, Vishal Bansal, Kaku Barkoh, Kenneth B Chapman, Daniel R Denis, Michael J Dorsi, Alexander Escobar, Steven Michael Falowski, Rosa Amelia Garcia, Jonathan M Hagedorn, Robert D Heros, Whitney S James, Hemant Kalia, Todd Lansford, Mark N Malinowski, Suzanne Marie Manzi, Pankaj Mehta, Robert Z Moghim, Gregory Anthony Moore, Soriaya Lizette Motivala, Yeshvant A Navalgund, Raj G Patel, Julie G Pilitsis, Michael E Schatman, Philip Michael Shumsky, Natalie Holmes Strand, Nestor D Tomycz, James J Yue, Dawood Sayed

Neuroscience Articles

INTRODUCTION: The use of electrical neuromodulation has often been limited to those with previous back surgery, peripheral neuropathy, and complex regional pain syndrome. Many patients with severe intractable low back pain were thought to be candidates for spinal cord stimulation (SCS), dorsal root ganglion stimulation, or peripheral nerve stimulation but did not meet the criteria. Recently, additional high-level data has supported the use of SCS in non-surgical low back pain (NSLBP), and United States Food and Drug Administration approval has been granted. The American Society of Pain and Neuroscience (ASPN) executive committee realized an unmet need to develop criteria for …

System Design For Highly Accurate And Efficient Target Detection In Triaxial Testing, Qingqing Fu

Masters Theses

Accurate and automated recognition of coded targets is crucial for high-precision photogrammetry-based measurements in triaxial testing. Traditional recognition methods, including those based on deep learning and table decoding, often struggle with issues such as perspective distortion, rotation, and variable lighting, leading to unreliable results. While deep learning approaches offer some improvements, they remain computationally intensive and sensitive to environmental factors.

This thesis introduces an innovative system that replaces deep learning algorithms with a blob analysis-based method for efficient and robust recognition of coded targets. The system also employs newly designed solid points of varying sizes and patterns, eliminating the need …

Embodied, Intentional, Relationship‑Based: Utilizing The Delphi Method To Define Dance/Movement Therapy Supervision, Mariah M. Lefeber

Faculty Publications - Graduate School of Counseling

In this study, clinical supervision within dance/movement therapy is considered in depth. The lack of and need for a consistent theory of supervision in dance/movement therapy is highlighted, including both supervision outcomes and common techniques and approaches used within the discipline. A Delphi method study is used to determine the consensus on the topic of dance/movement therapy supervision from a panel of experts. As a result of the study, the expert panel comes to a consensus of 71 statements regarding dance/movement therapy supervision. These statements are interpreted, dance/movement therapy supervision is defined, and connections are drawn to the value of …

Scientific Educations Among U.S. Judges, Christa J. Laser

American University Law Review

Should more judges have technical and scientific educations than are currently prevalent in the federal judiciary? This empirical study of the educational background of federal judges reports the undergraduate and graduate majors of active U.S. federal Article III judges. Information on the subject area of study is largely not publicly available, especially for judges appointed decades ago. This is the first and only publicly available research study of the subject areas of study of U.S. judges, collected via phone and email surveys to U.S. judges. The results of this study show that only 7.35% of federal judges have majors in …

Still Here: Reflections After Fifty Years Of Teaching Law, Ira P. Robbins

American University Law Review

No abstract provided.

The Right To Acquire Property, John G. Sprankling

American University Law Review

Can government prohibit the acquisition of all types of property? The intuitive answer to this question is “no.” But why? Is there a constitutional right to acquire property? And, if so, how does it apply if government merely prohibits acquisition of a certain type of property, such as contraceptives?

The Fourth, Fifth, and Fourteenth Amendments restrict when property may be “taken” or “seized” and when a person may be “deprived” of property. Thousands of law review articles and hundreds of books have analyzed the scope of these provisions. But almost no modern attention has been devoted to their logical counterpart—the …

Palliative Care In Acute Care Surgery: Research Challenges And Opportunities, Amelia W Maiga, Vanessa Ho, Rachel S Morris, Lisa M Kodadek, Thaddeus J Puzio, Gail T Tominaga, Masami Tabata-Kelly, Zara Cooper

Faculty, Staff and Student Publications

Palliative care includes effective communication, relief of suffering and symptom management with an underlying goal of improving the quality of life for patients with serious illness and their families. Best practice palliative care is delivered in parallel with life-sustaining or life-prolonging care. Palliative care affirms life and regards death as a normal process, intends neither to hasten death nor to postpone death and includes but is not limited to end-of-life care. Palliative care encompasses both primary palliative care (which can and should be incorporated into the practice of acute care surgery) and specialty palliative care (consultation with a fellowship-trained palliative …

Latent Classes Of Adolescent Trauma Exposure, Posttraumatic Stress Disorder Symptoms, And Substance Use Predict Clinical Diagnoses At 12-Month Follow-Up, John Leri, Josh M Cisler, Shaunna L Clark, Cody G Dodd, Saman Siddiqui, Leslie Taylor, Alexa Ayala, Sunita Stewart, Robyn Richmond, Jeffrey D Shahidullah, Justin F Rousseau, John M Hettema, D Jeffrey Newport, Karen D Wagner, Charles B Nemeroff

Faculty, Staff and Student Publications

BACKGROUND: Trauma exposure, posttraumatic stress disorder (PTSD), and substance use commonly co-occur among youth. Identifying specific subgroups of youth based on unique constellations across these domains may provide a novel way to identify and target youth at prospective risk for specific types of negative clinical outcomes.

METHODS: Trauma exposed youth completed structured clinical assessments as part of a longitudinal study (

RESULTS: Four latent classes were identified which differentiated participants based on the type of trauma exposure, the number of PTSD symptoms endorsed, and the propensity to be engaged in polysubstance use. Latent classes which were characterized by exposure to …

Patient-Self Inflicted Lung Injury (P-Sili): An Insight Into The Pathophysiology Of Lung Injury And Management, Himanshu Deshwal, Ahmed Elkhapery, Rudra Ramanathan, Deepak Nair, Isha Singh, Ankur Sinha, Rishik Vashisht, Vikramjit Mukherjee

Department of Medicine Faculty Publications

Acute respiratory distress syndrome (ARDS) is a heterogeneous group of disease entities that are associated with acute hypoxic respiratory failure and significant morbidity and mortality. With a better understanding and phenotyping of lung injury, novel pathophysiologic mechanisms demonstrate the impact of a patient’s excessive spontaneous breathing effort on perpetuating lung injury. Patient self-inflicted lung injury (P-SILI) is a recently identified phenomenon that delves into the impact of spontaneous breathing on respiratory mechanics in patients with lung injury. While the studies are hypothesis-generating and have been demonstrated in animal and human studies, further clinical trials are needed to identify its impact …

Oral Microbiome And Inflammatory Bowel Disease: New Understanding And Call To Action, Michael Saadeh, Sydney Donohue, Shaina Ailawadi, Gordon Hong, David A. Johnson

Department of Medicine Faculty Publications

The oral microbiome is the second largest microbial community in the human body after the gut microbiome. It includes an array of fungi, bacteria, amoebae, flagellates, archaea, and viruses, all of which are potential pathogens. This microbiome can act as a facilitator not only for protection but also for aggravation when dysbiosis occurs. Although conventional thought is this is primarily in terms of oral health issues, such as dental caries and gingival disease. The systemic effects of the oral microbiome however, are relevant to both gastrointestinal (GI) disease and non-GI disease. These systemic risks occur for several reasons, including upregulation …

The Urgent Need For Well-Being Programs In Medical Residencies In Brazil, Marcelo Bruno Generoso, Pedro Shiozawa, Ricardo Uchida, Marsal Sanches

Faculty, Staff and Student Publications

No abstract provided.

A Prior-Knowledge-Guided Feature Selection Method And Its Application To Biomarker Identification Of Schizophrenia, Ying Xing, Godfrey D Pearlson, Peter Kochunov, Vince D Calhoun, Yuhui Du

Faculty, Staff and Student Publications

Despite considerable efforts to uncover the neural basis of psychiatric disorders using neuroimaging, few methods utilize intrinsic brain-derived knowledge, leading to limited specificity and discriminability in biomarker identification. To leverage the inherent characteristics within the brain, we propose a prior-knowledge-guided feature selection method to flexibly unveil discriminative and target-oriented biomarkers of psychiatric disorders. Specifically, we construct a constrained sparse regularization allowing for the flexible integration of diverse prior knowledge to identify sparse neuroimaging features linked to specific psychopathology. Additionally, we simultaneously integrate graph-based regularization and redundancy-removal regularization to further ensure the discriminability and independence among the selected features. Different priors …

Brazilian Psychiatric Association Guidelines For The Treatment Of Social Anxiety Disorder, Leonardo Baldaçara, Thales Marcon Almeida, Diogo Cesar Dos Santos, Ana Beatriz Paschoal, Aldo Felipe Pinto, Luiz Antonio Vesco Gaiotto, Diogo De Lacerda Veiga, Fabiano Franca Loureiro, Leandro Fernandes Malloy-Diniz, Roseli Lage De Oliveira, Quirino Cordeiro, Marsal Sanches, Antônio E Nardi, Antônio Geraldo Da Silva, Ricardo R Uchida

Faculty, Staff and Student Publications

Social anxiety disorder (SAD), one of the most prevalent anxiety disorders, is not well recognized. In most cases, SAD follows an unremitted and chronic course, affecting individual functioning in relationships, education, and work. Due to the disorder’s relevance in Brazil, guideline-based treatments adapted to the Brazilian social and economic context are needed. We conducted a systematic review assessing several treatment modalities for SAD. PubMed, Cochrane, SciELO, and ClinicalTrials.gov were searched using the Medical Subject Headings social anxiety disorder and social phobia. Of the 438 selected articles, 20 were selected. Selective serotonin reuptake inhibitors are considered a first-line treatment for SAD …

Examining The Relationship Between Cardiometabolic Risk Factors And Telomere Length In Women: A Systematic Review, Jeni Page, Catherine Stephens, Melissa A Richard, Elizabeth Lyons, Elizabeth Baumler, M Terese Verklan, Elizabeth Lorenzo

Faculty, Staff and Student Publications

Background and objectives: Cardiometabolic syndrome (CMS) poses a significant public health challenge due to its rising prevalence in aging and significant healthcare costs. Recent studies have suggested telomere length (TL), a marker of cellular aging, may be impacted by CMS among women, but comprehensive evidence remains limited. This study aimed to examine the association between CMS risk factors (increased waist circumference [WC], elevated blood pressure, impaired fasting blood glucose, elevated triglycerides, decreased high-density lipoproteins) and TL in women, with consideration of age and race or ethnicity.

Research design and methods: A systematic review was conducted following PRISMA guidelines, with searches …

Mental Health Outcomes Of Latino Emerging Adults With Autism Spectrum Disorder In A Community-Based, Transition To Adulthood Program, Antonio F Pagán, Ana C Ramirez, Katherine A Loveland, Cecilia Montiel-Nava, Ron Acierno

Faculty, Staff and Student Publications

Latino individuals with autism spectrum disorder (ASD) face unique challenges during their transition to adulthood. This study evaluates ¡Iniciando! la Adultez, a culturally adapted behavioral health program aimed at addressing the co-occurring mental health needs of Latino young adults with ASD and their families. The program integrates culturally relevant elements to enhance engagement and effectiveness. Results indicated that the behavioral health intervention was associated with significant reductions in anxiety and depressive symptoms, highlighting the urgent need for tailored behavioral health services in this population. Additionally, the involvement of parents in group therapy demonstrated a positive impact on both parental and …

Consistent Frontal-Limbic-Occipital Connections In Distinguishing Treatment-Resistant And Non-Treatment-Resistant Schizophrenia, Yijie Zhang, Shuzhan Gao, Chuang Liang, Juan Bustillo, Peter Kochunov, Jessica A Turner, Vince D Calhoun, Lei Wu, Zening Fu, Rongtao Jiang, Daoqiang Zhang, Jing Jiang, Fan Wu, Ting Peng, Xijia Xu, Shile Qi

Faculty, Staff and Student Publications

Background and hypothesis: Treatment-resistant schizophrenia (TR-SZ) and non-treatment-resistant schizophrenia (NTR-SZ) lack specific biomarkers to distinguish from each other. This investigation aims to identify consistent dysfunctional brain connections with different atlases, multiple feature selection strategies, and several classifiers in distinguishing TR-SZ and NTR-SZ.

Study design: 55 TR-SZs, 239 NTR-SZs, and 87 healthy controls (HCs) were recruited from the Affiliated Brain Hospital of Nanjing Medical University. Resting-state functional connection (FC) matrices were constructed from automated anatomical labeling (AAL), Yeo-Networks (YEO) and Brainnetome (BNA) atlases. Two feature selection methods (Select From Model and Recursive Feature Elimination) and four classifiers (Adaptive Boost, Bernoulli Naïve …

Detection Of Erg11 Gene Mutation In Coding And Non-Coding Regions Of Clinical Candida Glabrata (Nakaseomyces Glabratus) Isolates From Pakistan, Saba Memon, Najia Karim Ghanchi, Urooj Zafar, Joveria Farooqi, Sadaf Zaka, Kauser Jabeen

Faculty, Staff and Student Publications

Azoles inhibit the cytochrome P450-dependent enzyme lanosterol 14α-demethylase (CYP51) that is encoded by the ERG11 gene. Azole resistance in Candida species arises through different mechanisms, like mutations in the ERG11 gene, ERG11 overexpression, CDR1,2 (Candida drug resistance) overexpression that actively efflux azole drugs, reducing their intracellular concentration and therapeutic effectiveness, and biofilm formation. We sequenced the ERG11 gene to determine mutations in the coding and non-coding regions of ERG11 in clinical isolates of Candida glabrata (Nakaseomyces glabratus) from Pakistan. Eight C. glabrata (N. glabratus) strains from our fungal strain bank (five fluconazole-resistant and …