Physical Sciences and Mathematics Commons^™

The Morphology And Development Of Kalahroud Cave, Iran, Shirin Bahadorinia, Sayed Hassan Hejazi, Alireza Nadimi, Derek C. Ford, Karine Wainer

International Journal of Speleology

Kalahroud Cave is located in central Iran, ~50 km north of Isfahan. The landscape is a typical mountain desert morphology of cuestas dissected by ravines and gorges created during rare surface run-off events; crest lines are ~2800 m asl and lowlands at ~2100 m asl. Kalahroud Cave (4500 m of mapped passages, ~60 m deep) is entered through breakdown in the eastern wall of a gorge. The host rock is a Cretaceous limestone and mudstone formation 60 m in thickness, underlain by sandstones and conglomerates and overlain by weakly permeable calcareous marl strata, all dipping 15-20^o. Below the …

The Missing Electrostatic Interactions Between Dna Substrate And Sulfolobus Solfataricus Dna Photolyase: What Is The Role Of Charged Amino Acids In Thermophilic Dna Binding Proteins?, Yvonne Gindt, Ban H. Edani, Antonia Olejnikova, Ariana N. Roberts, Sudipto Munshi, Robert J. Stanley

Department of Chemistry and Biochemistry Faculty Scholarship and Creative Works

DNA photolyase can be used to study how a protein with its required cofactor has adapted over a large temperature range. The enzymatic activity and thermodynamics of substrate binding for protein from Sulfolobus solfataricus were directly compared to protein from Escherichia coli. Turnover numbers and catalytic activity were virtually identical, but organic cosolvents may be necessary to maintain activity of the thermophilic protein at higher temperatures. UV-damaged DNA binding to the thermophilic protein is less favorable by ∼2 kJ/mol. The enthalpy of binding is ∼10 kJ/mol less exothermic for the thermophile, but the amount and type of surface area buried …

Fluctuations In A Cosmology With A Spacelike Singularity And Their Gauge Theory Dual Description, Robert H. Brandenberger, Elisa G. M. Ferreira, Ian A. Morrison, Yi-Fu Cai, Sumit R. Das, Yi Wang

Physics and Astronomy Faculty Publications

We consider a time-dependent deformation of anti–de Sitter (AdS) space-time which contains a spacelike “singularity”—a spacelike region of high curvature. Making use of the AdS/CFT correspondence we can map the bulk dynamics onto the boundary. The boundary theory has a time dependent coupling constant which becomes small at times when the bulk space-time is highly curved. We investigate the propagation of small fluctuations of a test scalar field from early times before the bulk singularity to late times after the singularity. Under the assumption that the AdS/CFT correspondence extends to deformed AdS space-times, we can map the bulk evolution of …

Fluctuations In A Cosmology With A Spacelike Singularity And Their Gauge Theory Dual Description, Robert H. Brandenberger, Elisa G.M. Ferreira, Ian A. Morrison, Yi-Fu Cai, Sumit R. Das, Yi Wang

Physics & Engineering Faculty Publications

We consider a time-dependent deformation of anti–de Sitter (AdS) space-time which contains a spacelike “singularity”—a spacelike region of high curvature. Making use of the AdS/CFT correspondence we can map the bulk dynamics onto the boundary. The boundary theory has a time dependent coupling constant which becomes small at times when the bulk space-time is highly curved. We investigate the propagation of small fluctuations of a test scalar field from early times before the bulk singularity to late times after the singularity. Under the assumption that the AdS/CFT correspondence extends to deformed AdS space-times, we can map the bulk evolution of …

A Simple Model Of The Chromatographic Process, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Working Papers

No abstract provided.

Interplay Between Evanescence And Disorder In Deep Subwavelength Photonic Structures, Hanan Herzig Sheinfux, Ido Kaminer, Azriel Z. Genack, Mordechai Segev

Publications and Research

Deep subwavelength features are expected to have minimal impact on wave transport. Here we show that in contrast to this common understanding, disorder can have a dramatic effect in a one-dimensional disordered optical system with spatial features a thousand times smaller than the wavelength. We examine a unique regime of Anderson localization where the localization length is shown to scale linearly with the wavelength instead of diverging, because of the role of evanescent waves. In addition, we demonstrate an unusual order of magnitude enhancement of transmission induced due to localization. These results are described for electromagnetic waves, but are directly …

Effect Of Void Fraction On Transverse Shear Modulus Of Advanced Unidirectional Composites, Jui-He Tai

USF Tampa Graduate Theses and Dissertations

In composite materials, transverse shear modulus is a critical moduli parameter for designing complex composite structures. For dependable mathematical modeling of mechanical behavior of composite materials, an accurate estimate of the moduli parameters is critically important as opposed to estimates of strength parameters where underestimation may lead to a non-optimal design but still would give one a safe one.

Although there are mechanical and empirical models available to find transverse shear modulus, they are based on many assumptions. In this work, the model is based on a three-dimensional elastic finite element analysis with multiple cells. To find the shear modulus, …

Pattern Phase Transitions Of Self-Propelled Particles: Gases, Crystals, Liquids, And Mills, Zhao Cheng, Zhiyong Chen, Tamás Vicsek, Duxin Chen

Dartmouth Scholarship

To understand the collective behaviors of biological swarms, flocks, and colonies, we investigated the non-equilibrium dynamic patterns of self-propelled particle systems using statistical mechanics methods and H-stability analysis of Hamiltonian systems. By varying the individual vision range, we observed phase transitions between four phases, i.e., gas, crystal, liquid, and mill-liquid coexistence patterns. In addition, by varying the inter-particle force, we detected three distinct milling sub-phases, i.e., ring, annulus, and disk. Based on the coherent analysis for collective motions, one may predict the stability and adjust the morphology of the phases of self-propelled particles, which has promising potential applications in …

A Complex Origin For The Kelso Dunes, Mojave National Preserve, California, Usa: A Case Study Using A Simple Geochemical Method With Global Applications, Daniel R. Muhs, Nicholas Lancaster, Gary L. Skipp

United States Geological Survey: Staff Publications

The Kelso Dune field in southern California is intriguing because although it is of limited areal extent (~100 km2), it has a wide variety of dune forms and contains many active dunes (~40 km2), which is unusual in the Mojave Desert. Studies over the past eight decades have concluded that the dunes are derived primarily from a single source, Mojave River alluvium, under a dominant, westerly-to-northwesterly wind regime. The majority of these studies did not, however, present data to support the Mojave River as the only source.We conducted mineralogical and geochemical studies ofmost of the 14 geomorphically defined dune groups …

The Origin Of Efficient Triplet State Population In Sulfur-Substituted Nucleobases, Marvin Pollum, Nicholas Dunn, Carlos E. Crespo-Hernández

Faculty Scholarship

Elucidating the photophysical mechanisms in sulfur-substituted nucleobases (thiobases) is essential for designing prospective drugs for photo-and chemotherapeutic applications. Although it has long been established that the phototherapeutic activity of thiobases is intimately linked to efficient intersystem crossing into reactive triplet states, the molecular factors underlying this efficiency are poorly understood. Herein we combine femtosecond transient absorption experiments with quantum chemistry and nonadiabatic dynamics simulations to investigate 2-thiocytosine as a necessary step to unravel the electronic and structural elements that lead to ultrafast and near-unity triplet-state population in thiobases in general. We show that different parts of the potential energy surfaces …

Large Linear Magnetoresistance In Heavily-Doped Nb:Srtio3 Epitaxial Thin Films, Hyunwoo Jin, Keundong Lee, Seung-Hyub Baek, Jin-Sang Kim, Byung-Ki Cheong, Bae Ho Park, Sungwon Yoon, B. J. Suh, Changyoung Kim, Sung S. Ambrose Seo, Suyoun Lee

Physics and Astronomy Faculty Publications

Interaction between electrons has long been a focused topic in condensed-matter physics since it has led to the discoveries of astonishing phenomena, for example, high-T_c superconductivity and colossal magnetoresistance (CMR) in strongly-correlated materials. In the study of strongly-correlated perovskite oxides, Nb-doped SrTiO₃ (Nb:SrTiO₃) has been a workhorse not only as a conducting substrate, but also as a host possessing high carrier mobility. In this work, we report the observations of large linear magnetoresistance (LMR) and the metal-to-insulator transition (MIT) induced by magnetic field in heavily-doped Nb:STO (SrNb_0.2Ti_0.8O₃) epitaxial thin …

Neilson Library Final Charter, Smith College

The New Neilson Library

Final charter for the New Neilson Library project.

Sensitivity Of Seven Diverse Species To Blue And Green Light: Interactions With Photon Flux, Michael Chase Snowden, Bruce Bugbee, Kevin R. Cope

Plants, Soils, and Climate Faculty Publications

Despite decades of research, the effects of spectral quality on plant growth, and development are not well understood. Much of our current understanding comes from studies with daily integrated light levels that are less than 10% of summer sunlight thus making it difficult to characterize interactions between light quality and quantity. Several studies have reported that growth is increased under fluorescent lamps compared to mixtures of wavelengths from LEDs. Conclusions regarding the effect of green light fraction range from detrimental to beneficial. Here we report the effects of eight blue and green light fractions at two photosynthetic photon fluxes (PPF; …

Synthesis And Characterization Of Polycyclic Aromatic Hydrocarbon ( Pah )-Porphyrin Hybrids, Ruixiao Gao

Theses and Dissertations

Carbaporphyrins are porphyrin analogs where one or more pyrrole units are replaced with a carbocyclic ring. Benziporphyrins are porphyrin analogues with a 1,3-phenylene unit replacing one of the pyrrole subunits. Because of cross-conjugation, benziporphyrins are not aromatic species. However, protonation of benziporphyrins can afford some aromatic characteristics. Although the synthesis of many examples of monocarbaporphyrins have been successfully executed, no examples of porphyrinoids with pyrene subunits have been prepared. Pyrene-containing porphyrinoids, which have been named as pyreniporphyrins, are theoretically significant molecules that provide insights into the aromaticity and reactivity of porphyrinoid systems.

In this thesis, two projects were conducted to …

The Eco-Epidemiology Of Pacific Coast Tick Fever In California, Kerry A. Padgett, Denise L. Bonilla, Marina E. Eremeeva, Carol A. Glaser, Robert S. Lane, Charsey Cole Porse, Martin B. Castro, Sharon L. Messenger, Alex Espinosa, Jill Hacker, Anne Kjemtrup, Bonnie Ryan, Jamesina J. Scott, Renjie Hu, Melissa Hardstone Yoshimizu, Gregory A. Dasch, Vicki Kramer

Environmental Health Sciences: Faculty Publications

Rickettsia philipii (type strain “Rickettsia 364D”), the etiologic agent of Pacific Coast tick fever (PCTF), is transmitted to people by the Pacific Coast tick, Dermacentor occidentalis. Following the first confirmed human case of PCTF in 2008, 13 additional human cases have been reported in California, more than half of which were pediatric cases. The most common features of PCTF are the presence of at least one necrotic lesion known as an eschar (100%), fever (85%), and headache (79%); four case-patients required hospitalization and four had multiple eschars. Findings presented here implicate the nymphal or larval stages of D …

Provenance Analysis Of Granite Cobbles In The Tiskilwa Till Using U -Pb Geochronology, Paul Antone Meister

Theses and Dissertations

U-Pb isotopic ages were determined for zircons extracted from granitic and related rocks in the Tiskilwa till to determine their origin. Crystalline cobbles (n = 750) were collected at localities from each of the four of the sub-lobes of the terminal Wisconsin moraines. Two sites were chosen from the Decatur, Peoria, and Princeton sub-lobes with one sample taken from the Harvard sub-lobe. Each sample was then individually processed, the zircons handpicked (n = 301), and geochronology conducted using LA-MC-ICPMS at the University of Arizona Laserchron Center. A Kolmogorov-Smirnov (K-S) statistical analysis show that all samples have identical zircon age spectra …

Takeover On The Tallgrass Prairie: How Lespedeza Cuneata Establishes Dominance, Morgan Rae Walder

Theses and Dissertations

Invasion ecology aims to study mechanisms by which invasive species are able to enter, establish, and spread within an ecosystem. This study analyzed Darwin’s naturalization and the biotic resistance hypotheses as the most likely explanations for invasion by an exotic legume, Lespedeza cuneata, into a tallgrass prairie. Darwin’s naturalization hypothesis posits that exotic species are less able to establish in communities that have related species, because similarity in morphology and function promotes intense competition for resources. The biotic resistance hypothesis states that competitors, herbivores, and pathogens already present in the community limit the colonization, naturalization, and persistence of invaders, therefore …

Integrate Text Mining Into Computer And Information Security Education, Hongmei Chi, Ezhil Kalaimannan, Dominique Hubbard

KSU Proceedings on Cybersecurity Education, Research and Practice

Insider threats has become a significant challenge to organization, due to the employees varying levels of access to the internal network. This will intern bypass the external security measures that have been put in place to protect the organization’s resources. Computer-mediated communication (CMC) is a form of communication over virtual spaces where users cannot see each other. CMC includes email and communication over social networks, amongst others. This paper focuses on the design and implementation of exercise modules, which can be integrated into cybersecurity courses. The main objectives of the paper include how to teach and integrate the CMC learning …

Cover Text Steganography: N-Gram And Entropy-Based Approach, Sara M. Rico-Larmer

KSU Proceedings on Cybersecurity Education, Research and Practice

Steganography is an ancient technique for hiding a secret message within ordinary looking messages or objects (e.g., images), also known as cover messages. Among various techniques, hiding text data in plain text file is a challenging task due to lack of redundant information. This paper proposes two new approaches to embed a secret message in a cover text document. The two approaches are n-gram and entropy metric-based generation of stego text. We provide examples of encoding secret messages in a cover text document followed by an initial evaluation of how well stego texts look close to the plain …

Hands-On Labs Demonstrating Html5 Security Concerns, Mounika Vanamala

KSU Proceedings on Cybersecurity Education, Research and Practice

The research is focused on the new features added in HTML5 standard that have strong implications towards the overall information security of a system that uses this implementation.A Hands-on Lab is developed to demonstrate how Web Storage and the Geo-location API of HTML5 can affect the privacy of the user.

“Not All Friends Are Equal”: Friendship Classification For Defending Against Social Engineering Attacks, Munene W. Kanampiu, Mohd Anwar

KSU Proceedings on Cybersecurity Education, Research and Practice

Social engineering is a serious security threat to Online Social Networks (OSNs). Identity theft, impersonation, phishing, and deception are some of the social engineering-based attacks that exploit vulnerabilities of interpersonal relationships of online users. As a result, relationships in OSNs need to be thoroughly examined. In this vein, we propose a relationship categorization model to evaluate relationship strength based on graph-theoretic properties and social network analysis (SNA) methods. For example, in Facebook, users may be categorized into close-neighbors, distant-neighbors, celebrities (influential by admiration), authority (influential by power), and loners. Close-neighbors category will help identify a set of trustworthy actors while …

Smart City Security, Shawn Ralko, Sathish Kumar

KSU Proceedings on Cybersecurity Education, Research and Practice

With rapid growth of technology involved and the implementation of the smart city concept, it is becoming vital to identify and implement security controls for their secure operation. Smart city security is essential for a city to incorporate the technologies into smart city cyber infrastructure and to improve the conditions of life for its citizens. In this paper, we have discussed the growth of smart city concept, their security issues. We also discuss the security solutions that needs to be implemented to keep the smart city cyber infrastructure secure. We have also pointed out the recommendations on the open issues …

The Role Of State Privacy Regulations In Mitigating Internet Users’ Privacy Concerns: A Multilevel Perspective, Tawfiq Alashoor

KSU Proceedings on Cybersecurity Education, Research and Practice

In the U.S., there is no comprehensive national law regulating the collection and use of personal information. As a response to the high level of privacy concerns among U.S. citizens and the currently limited regulations, states have enacted their own privacy laws over and above the principles of Fair Information Practices (FIP). In this exploratory study, we draw upon the privacy literature and the Restricted Access/Limited Control (RALC) theory of privacy to study the privacy concerns phenomenon with a multilevel theoretical lens. We introduce and test three novel propositions pertaining to the impact of state level privacy regulations on privacy …

Improvement And Maturity Of The Information Security Risk Management Process, Angela Jackson-Summers

KSU Proceedings on Cybersecurity Education, Research and Practice

No abstract provided.

Combining The Extended Risk Analysis Model And The Attack Response Model To Introduce Risk Analysis, Randall Reid

KSU Proceedings on Cybersecurity Education, Research and Practice

This paper uses the Extended Risk Analysis Model to introduce risk analysis in a classroom setting. The four responses to an attack, avoidance, transference, mitigation, and acceptance are overlaid on the Extended Risk Analysis Model to aid in the visualization of their relationship. It then expands and updates the cyber insurance portion of the Extended Risk Analysis Model.

Health It Security: An Examination Of Modern Challenges In Maintaining Hipaa And Hitech Compliance, Andrew S. Miller, Bryson R. Payne

KSU Proceedings on Cybersecurity Education, Research and Practice

This work describes an undergraduate honors research project into some of the challenges modern healthcare providers face in maintaining compliance with the Health Insurance Portability and Accountability Act (HIPAA) and HITECH (Health Information Technology for Economic and Clinical Health) Act. An overview of the pertinent sections of both the HIPAA and HITECH Acts regarding health information security is provided, along with a discussion of traditionally weak points in information security, including: people susceptible to social engineering, software that is not or cannot be regularly updated, and targeted attacks (including advanced persistent threats, or APTs). Further, the paper examines potential violations …

Investigating Information Security Policy Characteristics: Do Quality, Enforcement And Compliance Reduce Organizational Fraud?, Dennis T. Brown

KSU Proceedings on Cybersecurity Education, Research and Practice

Occupational fraud, the use of one’s occupation for personal enrichment through the deliberate misuse or misapplication of the organization’s resources or assets, is a growing concern for all organizations. While the typical organization loses at least 5% of annual revenues to fraud, current methods of detection and prevention are not fully adequate to reduce increasing occurrences. Although information systems are making life easier, they are increasingly being used to perpetrate fraudulent activities, and internal employee security threat is responsible for more information compromise than external threats.

The purpose of this research is to examine how information security policy quality and …

Individuals' Concern About Information Privacy In Ar Mobile Games, Dapeng Liu

KSU Proceedings on Cybersecurity Education, Research and Practice

Augmented Reality (AR) proves to be an attractive technology in mobile games. While AR techniques energize mobile games, the privacy issue is raised to be discussed. Employing social media analytics (SMA) techniques, this research makes efforts to examines Twitter postings of “PokemonGo” case and explores individuals’ attitudes toward privacy in AR games. In this research, we examine what are the privacy concerns of individuals in AR games and what are the individuals’ sentiments toward privacy. In the interesting case of PokemonGo, this paper suggests that individuals’ concerns about privacy are emphasized on six dimensions - collection, improper access, unauthorized secondary …

Semi-Supervised Deep Neural Network For Network Intrusion Detection, Mutahir Nadeem, Ochaun Marshall, Sarbjit Singh, Xing Fang, Xiaohong Yuan

KSU Proceedings on Cybersecurity Education, Research and Practice

Network security is of vital importance for corporations and institutions. In order to protect valuable computer systems, network data needs to be analyzed so that possible network intrusions can be detected. Supervised machine learning methods achieve high accuracy at classifying network data as normal or malicious, but they require the availability of fully labeled data. The recently developed ladder network, which combines neural networks with unsupervised learning, shows promise in achieving a high accuracy while only requiring a small number of labeled examples. We applied the ladder network to classifying network data using the Third International Knowledge Discovery and Data …

Planning And Implementing A Successful Nsa-Nsf Gencyber Summer Cyber Academy, Bryson R. Payne, Tamirat Abegaz, Keith Antonia

KSU Proceedings on Cybersecurity Education, Research and Practice

The GenCyber program is jointly sponsored by the National Security Agency (NSA) and the National Science Foundation (NSF) to help faculty and cybersecurity experts provide summer cybersecurity camp experiences for K-12 students and teachers. The main objective of the program is to attract, educate, and motivate a new generation of young men and women to help address the nationwide shortage of trained cybersecurity professionals. The curriculum is flexible and centers on ten cybersecurity first principles. Currently, GenCyber provides cyber camp options for three types of audiences: students, teachers, and a combination of both teachers and students. In 2016, over 120 …