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Articles 15211 - 15240 of 294529

Full-Text Articles in Physical Sciences and Mathematics

Temperature-Driven Air Circulation In Caves With Blind Passages, Chris Hendy Dr, David J. Merritt, Shannon Corkill, Cross Cross May 2025

Temperature-Driven Air Circulation In Caves With Blind Passages, Chris Hendy Dr, David J. Merritt, Shannon Corkill, Cross Cross

International Journal of Speleology

Two blind-passage show-caves in the Waitomo district of New Zealand, Ruakuri Cave and Aranui Cave, have been monitored for the impact of visitors on their environment, especially focusing on partial pressures of carbon dioxide because high levels cause speleothem degradation. In Ruakuri Cave, annual cycles of daily mean pCO2 correspond with annual cycles of visitor numbers, both peaking in summer. The origin of the high pCO2 had been assumed to be anthropogenic due to respiration from visitors. Prolonged intervals with no visitation during the Covid-19 pandemic saw the daily mean pCO2 continuing to show the annual cycle, …

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Machine Learning Course: A 15-Week Interactive Curriculum With Code And Case Studies, Pegah Khosravi May 2025

Machine Learning Course: A 15-Week Interactive Curriculum With Code And Case Studies, Pegah Khosravi

Open Educational Resources

This open-access machine learning course is a comprehensive 15-week curriculum developed and published on GitHub with full Google Colab compatibility. It combines theoretical concepts with hands-on Python coding, real-world datasets, and structured projects covering regression, classification, clustering, deep learning, transformers, and multimodal AI. The course is designed for students, educators, and researchers interested in applied machine learning, including biomedical applications. It includes explainable AI components and ethical discussions to align with modern AI standards. The course is maintained by BioMind AI Lab at CUNY.

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Chemical Reversal Of Beta-Lactam Resistance And Induction Of Hyper-Susceptibility In Pseudomonas Aeruginosa By Limiting Horizontal Gene Transfer Under Beta-Lactam Stress, Aimee Iradukunda May 2025

Chemical Reversal Of Beta-Lactam Resistance And Induction Of Hyper-Susceptibility In Pseudomonas Aeruginosa By Limiting Horizontal Gene Transfer Under Beta-Lactam Stress, Aimee Iradukunda

Dissertations - ALL

The emergence of antibiotic resistance poses a significant threat to global health, with certain bacterial strains evolving to resist multiple drugs. Urgent action is necessary to develop new antibacterial agents that effectively target these resistant strains; however, no new classes of antibiotics have been approved in recent decades. This research employs innovative biological tools to identify and highlight factors influencing resistance dynamics. Additionally, this study refines the novel approach by utilizing adjuvants to chemically repurpose existing antibiotics and improve their effectiveness against antibiotic-resistant strains. Pseudomonas aeruginosa, recognized for its adaptability, persistent infections—especially in cystic fibrosis patients—and widespread antibiotic resistance, serves …

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Measurements And Modeling Of Phonon-Mediated Quasiparticle Poisoning In Superconducting Qubit Arrays, Eric Yelton May 2025

Measurements And Modeling Of Phonon-Mediated Quasiparticle Poisoning In Superconducting Qubit Arrays, Eric Yelton

Dissertations - ALL

The realization of a quantum computer that can correct for random errors on its constituent quantum bits, or qubits, is one of the primary goals in the quantum information science community. One of the leading protocols to correct these errors on a quantum processor relies on nearest-neighbor coupling of an array of physical qubits that act collectively as a single logical qubit. Superconducting circuits are a leading implementation of a physical qubit and have been used in some of the first demonstrations of this error correction scheme. A key assumption of this protocol is that errors on the physical qubits …

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Evaluating Subduction Zone Processes In Early Paleozoic Rocks Of The Northern Appalachian Orogen, John Mark Brigham May 2025

Evaluating Subduction Zone Processes In Early Paleozoic Rocks Of The Northern Appalachian Orogen, John Mark Brigham

Dissertations - ALL

The study of rocks presently exposed at the surface in mountain ranges such as the Appalachian Mountains can offer insight into the evolution of orogenic and subduction zone processes over geologic time. To better understand the timing, conditions (i.e., pressure and temperature), and tectonic setting of mineral formation in former subduction settings, geologists conduct geochronology, geochemistry, and thermobarometry analyses on rocks and minerals in paleo-subduction zones. This dissertation contains three chapters that focus on serpentinization, hydrothermal alteration of mafic rocks during serpentinization (rodingitization), and high-pressure metamorphism that occurred in a subduction setting during the first phase of the Appalachian Orogeny. …

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Robotic Rhythm: A Contemporary Look At Ai-Driven Editing Tools’ Efficacy In Understanding And Replicating Creative Rhythm Editing Techniques., Alexander Selby-Lara, Charles Howard May 2025

Robotic Rhythm: A Contemporary Look At Ai-Driven Editing Tools’ Efficacy In Understanding And Replicating Creative Rhythm Editing Techniques., Alexander Selby-Lara, Charles Howard

Honors Thesis

It is undeniable that artificial intelligence (AI) has made its way into the film world. From AI-generated imagery and sound design in two 2025 Oscar nominees — The Brutalist and Emilia Pérez (Pulver) — to weekly updates and monthly beta releases of existing and new generative image and video models, AI-driven filmmaking tools are here to stay. But what does this mean for the post-production workflow? Much like camera development, editing technology has come a long way from flatbed film editors to Adobe Premiere Pro v. 25.0. Yet, despite each technological leap from system to system, the delicate task of …

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Maximal Simple Regular Matroids, Elana Joy Israel May 2025

Maximal Simple Regular Matroids, Elana Joy Israel

Dissertations - ALL

In 1980, Seymour completely classified regular matroids. In this thesis, we use this classification to provide a complete list of maximal simple regular matroids up through rank six. In each rank, exactly one of these is graphic. Additionally, there are one, two, and eight cographic, but not graphic, maximal simple regular matroids in ranks four, five, and six, respectively. In rank five, we also have the 10-element sporadic matroid, and in rank six we have a 12-element maximal simple regular matroid and 16-element maximal simple regular matroid, both of which are decomposable matroids that are not graphic, cographic, or sporadic. …

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Towards The Next Generation Of Storage Stack For Nand Flash Memory-Based Systems, Ziyang Jiao May 2025

Towards The Next Generation Of Storage Stack For Nand Flash Memory-Based Systems, Ziyang Jiao

Dissertations - ALL

The explosive growth of data has led to increased attention on NAND flash-based solid-state drives (SSDs), which offer high performance, low power consumption, and significant capacity per unit volume when compared to traditional hard-disk drives (HDDs). However, as NAND flash memory density continues to scale, modern SSDs suffer from what is known as fail-slow symptoms, and their performance degrades over time as they wear out. In this dissertation, we focus on understanding and addressing the performance, reliability, and sustainability challenges of modern flash-based storage systems by modeling key metrics, analyzing the design tradeoffs between these metrics, and optimizing existing storage …

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Asymptotics Of Fubini-Study Currents For Sequences Of Line Bundles, Melody Ann Wolff May 2025

Asymptotics Of Fubini-Study Currents For Sequences Of Line Bundles, Melody Ann Wolff

Dissertations - ALL

Let $(X,\omega)$ be a Kähler manifold, and $L_p$ be a sequence of line bundles on $X$ equipped with continuous hermitian metrics $h_p$. Let $\gamma_p$ be the Fubini-Study current and $h_p^{eq}$ the equilibrium metric corresponding to the metric $h_p$. Our goal is to generalize a theorem of Tian in Complex Geometry to a setting using arbitrary line bundles equipped with metrics with non-positive curvature. This amounts to finding sufficient conditions for $\gamma_p-c_1(L_p,h_p^{eq})$, when appropriately scaled, to converge to $0$ in the sense of currents. To achieve this goal, we imply methods of Demailly and the Oshawa-Takegoshi Extension Theorem to bound a …

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Quasiparticle Poisoning And Mitigation Strategies In Superconducting Qubits, Clayton Larson May 2025

Quasiparticle Poisoning And Mitigation Strategies In Superconducting Qubits, Clayton Larson

Dissertations - ALL

Quantum computers promise to solve currently intractable problems of great interest for a diverse range of applications. For a quantum computer to solve these problems, it must handle occasional errors with quantum error correction, which distributes the quantum information across many physical qubits, increasing resilience. A promising technology for implementing such a system uses superconducting circuits as physical qubits. Standard quantum error correction schemes can accommodate random, local errors, but errors that are correlated across multiple qubits are fatal. Correlated errors can arise from ionizing radiation impacting the device substrate, which creates free charge that can be sensed by the …

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Encircling Chains Around 4- And 6-Clusters In Fullerenes, Hannah Melissa Kimbrell May 2025

Encircling Chains Around 4- And 6-Clusters In Fullerenes, Hannah Melissa Kimbrell

Dissertations - ALL

Fullerenes are purely carbon molecules which can be represented by a 3-regular planar graph consisting of only hexagonal and (exactly 12) pentagonal faces. Since carbon atoms have valence 4 but our graphs are trivalent we need to double the edges in a perfect matching to bring the valence up to 4. The edges in a perfect matching form a Kekulé structure and the hexagonal faces bound by three Kekulé edges are called benzene rings. A maximal independent set of benzene rings for a given Kekulé structure is called a Clar set, and the maximum possible size of a Clar set …

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Development Of New Oxidative Methods And Synthesis Of Small Molecules For Modulation Of Biological Systems, Robert Eric Anderson May 2025

Development Of New Oxidative Methods And Synthesis Of Small Molecules For Modulation Of Biological Systems, Robert Eric Anderson

Dissertations - ALL

Oxoammonium salts have commonly been used to oxidize alcohols to aldehydes and ketones. More recently these reagents have been employed in several different oxidative transformations. Utilizing these reagents a new tandem elimination-oxidation process of tertiary alcohols has been developed. The new process yields an allylic ether which can be transformed to the alcohol easily through a reduction with zinc metal, removing the tetramethylpipyridyl protecting group derived form the oxoammonium salt. Mechanistically the reaction likely proceeds through oxoammonium salt mediated elimination followed by allylic oxidation through an ene-type mechanism. Due to the alcohol being protected by the easily removed oxoammonium salt, …

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Automated Flaw Discovery In Decentralized Systems Via Semantic Fuzzing Tools, Yibo Wang May 2025

Automated Flaw Discovery In Decentralized Systems Via Semantic Fuzzing Tools, Yibo Wang

Dissertations - ALL

This dissertation studies the security challenges of blockchain transaction processing before consensus. While prior work has focused on consensus protocols and smart contract bugs, the pre-consensus infrastructure, such as the mempool and off-chain batching, remain underexplored. This dissertation aims to bridge that gap by systematically analyzing both transaction processing in the mempool and off-chain transaction batching for cost-optimization. This dissertation focuses on two core contributions. First, it presents MPFUZZ, an automated software fuzzing tool designed to uncover denial-of-service vulnerabilities in Ethereum mempools. This work is the first to formally define the mempool fuzzing problem and introduce bug oracles that detect …

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Exploring Higher-Order Networks, Hao Tian May 2025

Exploring Higher-Order Networks, Hao Tian

Dissertations - ALL

Networks are natural representations of interactions in the real world (social networks, bio-networks, road networks, and the like) and are utilized across various disciplines. By default, network interactions are pairwise; in recent years, the demand for model ing higher-order interactions has kept increasing. For example, in collaboration networks, we aim to distinguish between one publication coauthored by three or three publications coauthored by two in a triangle. In this work, we perform higher-order network analysis in the following two directions. First, we explore the influence of higher-order structures on dyadic (pairwise) graphs; second, we model higher-order interactions by ordered hy …

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Geometry And Mechanical Response Of Twisted Thin Tubes, Pan Dong May 2025

Geometry And Mechanical Response Of Twisted Thin Tubes, Pan Dong

Dissertations - ALL

Nature provides many examples of thin sheets and shells, from flower petals to graphene sheets. Such materials can exhibit complex deformations such as creases, folds and wrinkles, particularly in thin, flexible structures like cylindrical shells and ribbons. Here we investigate the geometric transformation and mechanical response of a twisted thin tube, which is made from a thin polymer sheet. In Chapter 2, an interesting "locking behavior" was found in a thin cylindrical shell. After an initial compression, the shell can be twisted with little resistance until it reaches a “locking angle”, which coincides with the appearance of an ordered wrinkle …

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Harnessing Llms To Detect Hate Speech, Weibin Cai May 2025

Harnessing Llms To Detect Hate Speech, Weibin Cai

Theses - ALL

Hate is a sentiment, while hate speech refers to the expression of hate in a form that targets and attacks specific groups, such as race, religion, or gender. With the rise of the internet and social media, hate speech has spread rapidly, gaining wide exposure and posing threats to individual well-being, the profits of major tech companies, and social stability. As a result, both industry and academia have turned their attention to the study of hate speech. One of the most active areas is hate speech detection, which involves training models to predict whether a given piece of content is …

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On The Embeddability Of Small Cubic Graphs Into The Torus, Marie Kramer May 2025

On The Embeddability Of Small Cubic Graphs Into The Torus, Marie Kramer

Dissertations - ALL

The embeddability of graphs into different surfaces has been studied for nearly a century. In 1930, Kuratowski famously proved that a graph is planar if and only if it does not contain the complete graph K5 or the complete bipartite graph K3,3 as a topological minor. In particular, K3,3 is the only cubic obstructions for the plane. This sparked interest in two different directions: What are analogous results for other surfaces, and what can be said about embeddings of K5 and K3,3 into other surfaces? Regarding the first question, it was shown in the 1970s and 80s by Glover, Huneke, …

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Body Size Trends Of Late Devonian Dacryoconarid Tentaculitoids And Protocol Development For I/Ca Analysis In Corals By La-Icp-Ms, Ashley Prow-Fleischer May 2025

Body Size Trends Of Late Devonian Dacryoconarid Tentaculitoids And Protocol Development For I/Ca Analysis In Corals By La-Icp-Ms, Ashley Prow-Fleischer

Dissertations - ALL

Paleoclimatology provides context for understanding the timescales and animal responses to environmental change under modern climate change scenarios. The key drivers of climate variability are identified using proxies for environmental conditions. Biological archives are especially useful for linking changing conditions to ecosystem responses. This dissertation establishes the foundation for utilizing dacryoconarid microfossils as biostratigraphic indicators of environmental change in the Paleozoic. It also presents a protocol for measuring iodine-to-calcium (I/Ca) ratios—an established proxy for localized hypoxia—in coral skeletons using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Studying Paleozoic microfossils presents challenges due to the high degree of induration of …

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Frustration And Functionality : Geometry And Topology In Mechanical Metamaterials, Sourav Roy May 2025

Frustration And Functionality : Geometry And Topology In Mechanical Metamaterials, Sourav Roy

Dissertations - ALL

This dissertation is concerned with a study of the effect of geometry in complex few body mechanical systems. The problems that we set out to solve lie on the interface of soft condensed matter physics, geometry and topology. In the first problem, I developed an effective elasticity theory of thin mechanical metamaterial sheets. This work explored the elastic response of thin metamaterial sheets draped on a uniformly and weakly curved substrate. The model spells out an elegant screening law that shows that a metamaterial alleviates elastic stresses by actuating the soft modes accessible to it. In the second problem, we …

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Pluricomplex Green Functions And Transform Methods For The Laplacian, Jesse Joel Hulse May 2025

Pluricomplex Green Functions And Transform Methods For The Laplacian, Jesse Joel Hulse

Dissertations - ALL

There are two research themes within complex analysis presented. The first is developing generalizations of the Unified Transform Method as a novel way to compute fluid flows and numerically solve boundary value problems for holomorphic functions and solutions to the Laplacian and complex Helmholtz equation. The second is finding a formula for the pluricomplex Green function with two poles of equal weights for the bidisk. The Unified Transform Method (also sometimes known as the Fokas Method) is a technique for numerically solving boundary value problems for linear and integrable nonlinear PDEs. Crowdy reformulated the Unified Transform Method in the complex …

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Deformations Of Thin Membranes In Incompatible Geometries And Interactions In Mechanical Hysteron Systems, Zachariah Schrecengost May 2025

Deformations Of Thin Membranes In Incompatible Geometries And Interactions In Mechanical Hysteron Systems, Zachariah Schrecengost

Dissertations - ALL

Soft reconfigurable systems exhibit behaviors which are highly dependent on their geometries. Thin membranes can deform in a myriad of ways as they navigate geometries different from their own in an energy efficient manner. Behaviors in mechanical hysteron systems are influenced by the geometry of the interactions and global driving. This dissertation focuses on two different types of systems which are governed in part by their geometries: thin membranes in geometrically incompatible configurations and interacting mechanical hysterons. A thin membrane forced into a conflicting geometry with an incompatible metric will deform in highly non-trivial ways. These deformations are an attempt …

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The Relationship Between Belief In Religion And Ethical Values, Lauren Youngquist May 2025

The Relationship Between Belief In Religion And Ethical Values, Lauren Youngquist

Science Symposium

Research suggests that individuals who hold religion to a higher importance are more likely to make ethical judgments, although there has been contradicting research showing no correlation between religion and ethics. My study fills the gap in the literature and examines the relationship between a belief in religion and ethics, specifically looking at the justifiability of certain unethical behaviors.

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Survey Of Symmetric Encryption Techniques Implemented Over Gpu Platforms, Hawraa Moussa, Ahmed Fanfakh May 2025

Survey Of Symmetric Encryption Techniques Implemented Over Gpu Platforms, Hawraa Moussa, Ahmed Fanfakh

Journal of Intelligent Informatics, Networking, and Cybersecurity

Encryption is one of the most important techniques used to deliver protection solutions. Symmetric encryption uses a single key for encryption and the decryption process. Symmetric encryption implements block encryption, replacement, and switching. Consequently, it is problematic if the private keys obtained from the protocols are frequent in certain states or exhibit reduced unpredictability. Several researchers applied the cryptography method in a parallel fashion to minimize the time needed to complete encrypting and decrypting data procedures. Numerous viable solutions have been found to increase the levels of encryption algorithm performance made by the researchers to use parallelism to boost their …

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Integration Of Zero Trust Architecture And Machine Learning For Improving The Security Of Software Defined Networking: A Review, Manar H. Bashaa, Wesam S. Bhaya, Nabeel H. Kaghed Al-Aaraji May 2025

Integration Of Zero Trust Architecture And Machine Learning For Improving The Security Of Software Defined Networking: A Review, Manar H. Bashaa, Wesam S. Bhaya, Nabeel H. Kaghed Al-Aaraji

Journal of Intelligent Informatics, Networking, and Cybersecurity

Many add new networks, but management has a lot of work to do as well. Software Defined Networking (SDN) was conceived to address these challenges in a more structured way, SDN allows centralized management of the network and provision of software based traffic understanding making it relatively easier to manage large scale networks. The downside to SDN is its vulnerability to cyber attacks. The more centralized the structure the more efficient it is, however the more specific weaknesses it possesses such as DoS attacks for example. The ``perimeter'' approach to security is outdated with today's security technology. Zero Trust Architecture …

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Ua35/7 Class Of 2025 Commencement, Wku Gatton Academy Of Mathematics & Science May 2025

Ua35/7 Class Of 2025 Commencement, Wku Gatton Academy Of Mathematics & Science

WKU Administration Documents

Commencement program for the WKU Gatton Academy of Mathematics & Science with list of graduates.

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Diel Patterns Of Biogeochemical Indicators In Tidally-Dominated Creeks, Juliana Calderone May 2025

Diel Patterns Of Biogeochemical Indicators In Tidally-Dominated Creeks, Juliana Calderone

Honors Theses

Marshes and swashes are vital environments as a controlling barrier between land affected by various pollutants and the ocean. Eutrophication and the effects of this process can be detrimental for the areas experiencing it. I am interested in ways areas that have little contact with human interactions compare to areas that are heavily urbanized, and whether either of these locations is at a higher risk for eutrophication. Using spectrophotometry and fluorometry, I analyzed samples collected from the relatively undeveloped and restricted-access locations of Waities Island Beach and Dunn Sound monthly for dissolved nutrients, and chlorophyll. At the time of sampling, …

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Identification And Preclinical Assessment Of Novel Therapeutic Modalities In Environmental Exposure-Induced Lung Disease, Aaron D. Schwab May 2025

Identification And Preclinical Assessment Of Novel Therapeutic Modalities In Environmental Exposure-Induced Lung Disease, Aaron D. Schwab

Theses & Dissertations

Environmental lung diseases are preventable respiratory conditions either caused or made worse by inhaled environmental exposures. Contemporarily, environmental lung diseases are most associated with workplace exposures given specific occupational processes aerosolize inflammatory agents that can be inhaled at high concentrations. Although a considerable amount is known regarding immunoglobulin (Ig)E-mediated responses to environmental exposures, little is known about non-IgE mediated respiratory conditions resulting from lipopolysaccharide (LPS)-enriched organic dust exposure(s). Chronic respiratory diseases such as asthma, hypersensitivity pneumonitis, chronic obstructive pulmonary disease (COPD), and pulmonary fibrosis have all been identified as environmental lung diseases caused or exacerbated by such environmental dusts. Therapeutic …

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Multi-Modal Mri For The Pre-Clinical Evaluation Of Hiv-Linked Changes In The Central Nervous System, Gabriel Gauthier May 2025

Multi-Modal Mri For The Pre-Clinical Evaluation Of Hiv-Linked Changes In The Central Nervous System, Gabriel Gauthier

Theses & Dissertations

Though the inception of anti-retroviral therapy (ART) has fundamentally changed the life expectancy of human immunodeficiency virus (HIV) patients, accessibility and outcomes vary enormously along demographic lines. Even for people living with HIV (PLWH) with perfect access and adherence to anti-retroviral drugs (ARVs), modern treatment plans are fundamentally unable to secure complete viral remission for patients. The cause of this perpetual infection is the persistence of viral reservoirs in the central nervous system (CNS), hidden beyond the reach of modern ARVs, leaving patients to deal with lifelong medication side-effects and risks of developing HIV-associated neurodegenerative disorders (HAND). Despite improving outcomes …

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Intrinsic And Extrinsic Drivers Of Bioaerosol Decay: Investigating Pathogen Stability Of Bacteriophage Ms2, Sin Nombre Virus, And Sars-Cov-2 In Simulated Environments, Elizabeth A. Klug May 2025

Intrinsic And Extrinsic Drivers Of Bioaerosol Decay: Investigating Pathogen Stability Of Bacteriophage Ms2, Sin Nombre Virus, And Sars-Cov-2 In Simulated Environments, Elizabeth A. Klug

Theses & Dissertations

The threat posed by a virus as a bioaerosol depends largely on its stability under various environmental conditions (relative humidity (RH), sunlight, ozone, etc.). This stability is typically studied through aerosol decay—how the virus' viability changes over time when exposed environmental conditions. The Goldberg rotating drum, a widely used tool for studying bioaerosols, has been the basis of such research (Goldberg et al., 1958). However, it has significant limitations, including an inability to measure initial pathogen infectivity loss and the use of small sample volumes. Additionally, it does not answer the question of what intrinsic factors (lipids, proteins, nucleic acids) …

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Exploration Into Homotopy Equivalence And Vietoris-Rips Complexes, Alexander J. Mobley May 2025

Exploration Into Homotopy Equivalence And Vietoris-Rips Complexes, Alexander J. Mobley

Honors Theses

An important question in discrete topology and geometry is how to recover the structure and characteristics of a manifold when only given a finite set of points sampled from that manifold. Thus, if mathematicians have a point cloud of data which induces a discrete metric space, they look for some structure to these points. Understanding the structure of these points often gives needed insight to solve this problem. One such way to determine structure to these points is to use these points to construct a Vietoris-Rips complex. In abstract, Latschev shows that this allows us to recover the homotopy type …

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