Physical Sciences and Mathematics Commons^™

The Gold Coast Transformed : From Wilderness To Urban Ecosystem, Tor Hundloe, Bridgette Mcdougall, Craig Page

Tor Hundloe

Extract: This is the story of a unique city, Australia’s premier tourist city, a city cut out of coastal vegetation, including paperbark swamps, mangroves and rainforests of worldwide significance. The city has a relatively short history as until half a century ago (two human generations) it was but several relatively small villages, each with its own natural and social features. Two generations is a very short time for a city to grow to be the sixth-largest in population in Australia and to have global recognition as the country’s beach playground. The Gold Coast ranks with Honolulu in Hawaii, with Palm …

Metal Oxides As Photocatalysts, Mohammad Mansoob Khan Dr

Dr. Mohammad Mansoob Khan

Metal oxides are of great technological importance in environmental remediation and electronics because of their capability to generate charge carriers when stimulated with required amount of energy. The promising arrangement of electronic structure, light absorption properties, and charge transport characteristics of most of the metal oxides has made possible its application as photocatalyst. In this article definition of metal oxides as photocatalyst, structural characteristics, requirements of the photocatalyst, classification of photocatalysts and the mechanism of the photocatalytic process are discussed.

Orbital Simulations For Directed Energy Deflection Of Near-Earth Asteroids, Qicheng Zhang, Kevin J. Walsh, Carl Melis, Gary B. Hughes, Philip Lubin

Statistics

Directed energy laser ablation at the surface of an asteroid or comet produces an ejection plume that will impart a thrust on the asteroid. This thrust can mitigate a threatened collision with the Earth. This technique uses the asteroid itself as the deflection propellant. The DESTAR laser system is designed to produce a sufficiently intense spot on the surface of an asteroid to accomplish this in one of two operational modes. One is a complete "stand-off" mode where a large space based phased-array laser directed energy system can interdict asteroids at large distances allowing sufficient time to mitigate nearly all …

Estimation In The Exponentiated Kumaraswamy Dagum Distribution With Censored Samples, Broderick O. Oluyede, Shujiao Huang

Department of Mathematical Sciences Faculty Publications

In a recent note, Huang and Oluyede (2014) proposed a new model called the exponentiated Kumaraswamy Dagum (EKD) distribution with applications to income and lifetime data. In this note, this distribution is shown to be a very competitive model for describing censored observations in lifetime reliability problems. This work shows that in certain cases, the EKD distribution performs better than other parametric model such as the exponentiated Kumaraswamy Weibull distribution and its sub-models, which include some of the commonly used models in survival analysis and reliability analysis, such as the exponentiated Weibull, Weibull and exponential distributions.

Trade-In Vehicle Value Optimizing Systems And Methods For Sellers, Buyers, And Dealerships, Lloyd D. Snell, Brad M. Rosenhamer

Lloyd D Snell

Computer-implemented methods and computer systems for offering vehicles, which are subject to sale agreements between sellers and buyers, on online markets and soliciting additional offers for these vehicles by third parties. This additional offering may generate additional revenues, above the agreed upon prices between the initial seller and buyer, and these revenues can be shared by sellers, buyers, and service providers. For example, a seller may contract with a dealer to sell a used car for a certain price, which may be a part of a trade-in transaction. Information about the car, including a price, is then posted on a …

Investigations Of Synthetic Fuels: S8 And Sasol Ipk To Determine The Possibility Of Alternate Fuels In The Aerospace Industry, Scott M. Dyke

GS4 Georgia Southern Student Scholars Symposium

Investigations of Synthetic Fuels: S8 and Sasol IPK to Determine the Possibility of Operation as Alternate Fuels in the Aerospace Industry

Name: Scott Dyke

Co-Authors: Martin Muinos, Julia Heimberger, Dr. Valentin Soloiu,

An ever-growing society that becomes more and more dependent on a finite energy source will eventually exceed its supply. Fossil fuel quantities are continuously decreasing and new solutions are needed. According to the United States Department of Transportation, over 10 billion gallons of airline fuels have been consumed in each of the past 15 years with some years over 13 billion gallons. In the meantime, fuel costs have …

Packing Densities Of Colored And Non-Colored Patterns, Matthew R. Just

GS4 Georgia Southern Student Scholars Symposium

Pattern packing concerns finding an optimal permutation that contains the maximum number of occurrences of a given pattern and computing the corresponding packing density. In many instances such an optimal permutation can be characterized directly and the number of occurrences of the pattern in interest may be enumerated explicitly. In more complicated patterns a direct characterization may be more challenging, however computational results for long permutations can help provide an indirect characterization of the general form of an optimal permutation. Much work has been done on the study of pattern packing in layered patterns, as the optimal permutation of a …

Modeling Traffic At An Intersection, Kaleigh L. Mulkey, Saniita K. Fasenntao

Symposium of Student Scholars

The main purpose of this project is to build a mathematical model for traffic at a busy intersection. We use elements of Queueing Theory to build our model: the vehicles driving into the intersection are the “arrival process” and the stop light in the intersection is the “server.”

We collected traffic data on the number of vehicles arriving to the intersection, the duration of green and red lights, and the number of vehicles going through the intersection during a green light. We built a SAS macro code to simulate traffic based on parameters derived from the data.

In our program …

Crystal Nucleation Of Palladium-Doped Lithium Disilicate Glass, Gregory Humble

Symposium of Student Scholars

The effect of concentration of palladium particles on crystal nucleation was investigated for lithium disilicate glass. The heterogeneous nucleation rate for 470°C and 480°C were calculated for a concentration of 0.001% palladium by weight. The DTA method of measuring nucleation and crystallization was used in this calculation.

Green Roof Energy Balances For Native Grasses And Sedum, Chris Schwarz

School of Natural Resources: Dissertations, Theses, and Student Research

Green roofs offer a possible solution to reduce urban heat island effects caused by urbanization. Conventional green roofs use sedum for plant cover but growing evidence suggests native species offer better results for harsher environments. However, more information is needed to understand the potential of native species for green roof use in terms of survivability and cooling potential. This study was conducted from July 2013 through October 2013 to quantify the energy balance components for native grasses and sedum on a Midwestern green roof. The semi-intensive green roof located on the Larson Building parking garage in Lincoln, NE was used …

Unraveling Structures Of Protection Ligands On Gold Nanoparticle Au68(Sh)32, Wen Wu Xu, Yi Gao, Xiao Cheng Zeng

Xiao Cheng Zeng Publications

New low-energy atomic structures of the thiolate-protected gold nanoparticle Au₆₈(SH)₃₂ are uncovered, where the atomic positions of the Au atoms are taken from the recent single-particle transmission electron microscopy measurement by Kornberg and co-workers, whereas the pattern of thiolate ligands on the gold core is attained on the basis of the generic formulation (or rule) of the “divide and protect” concept. Four distinct low-energy isomers, Iso1 to Iso4, whose structures all satisfy the generic formulation, are predicted. Density-functional theory optimization indicates that the four isomers are all lower in energy by 3 to 4 eV than the …

2015 Sonia Kovalevsky Math For Girls Day Program, Association For Women In Mathematics, Lincoln University Of Missouri, Donna L. Stallings

Math for Girls Day Documents

10th Annual Lincoln University Sonia Kovalevsky Math for Girls Day program on April 24, 2015.

Fault Zone Hydrogeology In Crystalline And Sedimentary Aquifers In Arid Regions: Remote Sensing, Hydrological And Geoloectrical Methods, Lamees M. Mohamed

Research and Creative Activities Poster Day

An integrated study was conducted using remote sensing, hydrological and geophysical methods to investigate the role of structural elements in controlling the groundwater accumulation and flow in fractured basement complex. This research shows that the structural elements as fault and shear zones could act as a conduit or a barrier for the groundwater depending on the direction of these elements with the groundwater flow. Similar findings are observed in Central Sinai as it was found in Southern Sinai. These findings will help in more understanding of the fractured basement aquifers.

Ranked Based Procedures For Ordered Alternative Models, Yuanyuan Shao

Research and Creative Activities Poster Day

The ordered alternatives in a one-way layout with k ordered treatment levels are appropriate for many applications, especially in psychology and medicine. There is an extensive literature in this area, and many parametric and nonparametric approaches have been introduced. This study uses rank based estimators to robustify the Abelson-Tukey method. The approach extends to the two-way layout with b blocks and k treatments. One of the two statistics having maximum asymptotic local power and the greatest efficiency when the alternative hypothesis consists of a specific pattern, and extended research has been completed on detecting ordered alternatives with unknown peaks.

Protecting User's Privacy In Electronic Prescribing Systems With Apb, Raed M. Salih

Research and Creative Activities Poster Day

Electronic prescribing (or e-prescribing) systems are used to record and transmit millions of electronic prescriptions between prescribers and pharmacies. During a dissemination of e-prescriptions, a patient's sensitive data might leak or be disclosed to unauthorized parties. Examples of sensitive data included in prescriptions are patient's name, home address, and names of mental illness medications. We propose the use of Active Privacay Bundles (APB) for protecting privacy of e-prescribing users (patients, prescibers, or pharmacy benefit managers). APB protects prescriptions that are being disseminated among different authorized parties within an electronic prescribing system.

Adaptive Enrichment Designs For Randomized Trials With Delayed Endpoints, Using Locally Efficient Estimators To Improve Precision, Michael Rosenblum, Tianchen Qian, Yu Du, Huitong Qiu

Johns Hopkins University, Dept. of Biostatistics Working Papers

Adaptive enrichment designs involve preplanned rules for modifying enrollment criteria based on accrued data in an ongoing trial. For example, enrollment of a subpopulation where there is sufficient evidence of treatment efficacy, futility, or harm could be stopped, while enrollment for the remaining subpopulations is continued. Most existing methods for constructing adaptive enrichment designs are limited to situations where patient outcomes are observed soon after enrollment. This is a major barrier to the use of such designs in practice, since for many diseases the outcome of most clinical importance does not occur shortly after enrollment. We propose a new class …

Geochemical Investigation Of The Origin Of The Back Forty Volcanogenic Massive Sulfide Deposit In Menominee County, Michigan, Joyashish Thakurta, Anthony Boxleiter

Faculty Research and Creative Activities Award (FRACAA)

Volcanogenic Massive Sulfide (VMS) deposits constitute one of the world’s greatest sources of copper, zinc, lead, silver, gold, and a wide range of by-products including tin, cadmium, antimony, and bismuth (Kearney, 2003). The metals we mine on earth from ore-bearing deposits, such as VMS deposits, are vital to everyday life from the vehicles we drive to the homes we build. The first step involved in unlocking the value of metal on earth begins with geologic exploration to locate these deposits within the earth. This begins with field work conducted by geologists involving mapping, rock sampling and analysis.

A Maltose-Binding Protein Fusion Construct Yields A Robust Crystallography Platform For Mcl1, Matthew C. Clifton, David M. Dranow, Alison Leed, Ben Fulroth, James W. Fairman, Jan Abendroth, Kateri A. Atkins, Ellen Wallace, Dazhong Fan, Guoping Xu, Z. J. Ni, Douglas S. Daniels, John Van Drie, Guo Wei, Alex B. Burgin, Todd R. Golub, Brian K. Hubbard, Michael H. Serrano-Wu

Chemistry Faculty Publications

Crystallization of a maltose-binding protein MCL1 fusion has yielded a robust crystallography platform that generated the first apo MCL1 crystal structure, as well as five ligand-bound structures. The ability to obtain fragment-bound structures advances structure-based drug design efforts that, despite considerable effort, had previously been intractable by crystallography. In the ligand-independent crystal form we identify inhibitor binding modes not observed in earlier crystallographic systems. This MBP-MCL1 construct dramatically improves the structural understanding of well-validated MCL1 ligands, and will likely catalyze the structure-based optimization of high affinity MCL1 inhibitors.

Time-Dependent Photoionization Modeling Of Gaseous Nebulae, Manuel Bautista, Ehab Elhoussieny, Javier Garcia, T. R. Kallman

Faculty Research and Creative Activities Award (FRACAA)

Photoionized plasmas are the most commonly observed in astronomy, particularly through optical and UV observatories, such as the Hubble Space Telescope (HST). Modeling astronomical photoionized plasmas is generally done from the condition of steady-state statistical equilibrium, but none-equilibrium time-dependent photoionization (TDP) is found in a large variety of astronomical objects, yet it has received little attention thus far. There are multiple examples of notable failures of steady-state photoionization modeling. We have developed of a general purpose time-dependent photoionization modeling code and its use in the analysis of astronomical spectra. The new code, TDPX, is capable of including all chemical elements …

Protection Of Sensitive Data In Clouds Using Active Privacy Bundles And Agent-Based Multi-Party Computation, Akram Sarhan

Research and Creative Activities Poster Day

The lack of the protection tools and the fast pace of technological advancement make people unable to control privacy of their data in clouds and other distribution environments. We propose an approach called Active Privacy Bundles with Multi-Party Computation (APB-MPC), that protects senesitive data and identities of their owners/guardians during the entire data lifecycle in clouds or other distribution systems. Our research has three goals: (i) proctecting sensitive data without centralized trusted third parties (TTPs); (ii) using APB and MPC for identity management without centralized TTPs; and (iii) exploiting parallelism for efficient data dissemination.

Chile’S Calbuco Volcano Erupts Without Warning. What Can We Expect Next?, Brittany Brand

Geosciences Faculty Publications and Presentations

Around 5:00 pm local time on April 22, scientists at Southern Andean Volcano Observatory in Chile began picking up volcanic earthquakes at the Calbuco volcano. A disturbingly short 60 minutes later, the volcano was in full eruption, producing an impressive column of ash extending to more than 49,000 feet into the sky. Ash primarily drifted north and northeast of the volcano, covering towns below in a layer of fine ash. Observatory scientists quickly called for an evacuation zone of 12.5 miles.

A Study Of Thunderstorm Microphysical Properties And Lightning Flash Counts Associated With Terrestrial Gamma-Ray Flashes, D. E. Barnes, Michael E. Splitt, Joseph R. Dwyer, Steven M. Lazarus, David M. Smith, Hamid K. Rassoul

Aerospace, Physics, and Space Science Faculty Publications

The terrestrial gamma ray flash (TGF) is an emission of highly energetic radiation produced by or at least in close association with lightning. Previous investigations attempted to isolate the production mechanisms and production altitude(s) of TGFs as well as macrophysical characteristics, while thunderstorm microphysical characteristics were largely ignored. This investigation into thunderstorms and their hydrometeor and flash characteristics utilize temporal and spatial coincident satellite passes between the Reuven Ramaty High Energy Solar Spectroscopic Imager and the Tropical Rainfall Measuring Mission to determine the bulk (or footprint) microphysical properties of two types of study events, the thunderstorm complexes which are associated …

Chemistry And Biochemistry News, Georgia Southern University

Department of Chemistry and Biochemistry News (2015-2023)

• Chemistry Students Make a Splash at GSU Research Symposium

Toward The Measurement Of Biodistribution Of 18F-Labeled Industrial Chemicals With Positron Emission Tomography (Pet), Katelyenn S. Mccauley

Department of Chemistry: Dissertations, Theses, and Student Research

Plasticizers are added to polymeric materials to increase flexibility and durability, thus they constitute a common, and widely used class of industrial chemicals. Plasticizers have been suspected of a number of adverse health effects including the interference with the endocrine system.¹ These substances have the tendency to migrate to the surfaces of materials, where they can be absorbed, ingested, or inhaled. ⁵ The iniquitousness of plasticizers and the daily contact with polymeric materials has given rise to concern about the toxicity and health effects of these substances. Many long-term and excessive-dose studies have been conducted on many of these …

The 8-Silyloxyquinoline Scaffold As A Versatile Platform For The Sensitive Detection Of Aqueous Fluoride, Xinqi Zhou

Department of Chemistry: Dissertations, Theses, and Student Research

As one of the most essential elements in nature, fluoride has been well known and extensively studied since the 16^th century. Since then the two-edged nature of fluoride in biological systems has been well described. Specifically, moderate fluoride exposure can aid in tooth and bone development, while fluoride overexposure results in the depilating disease known as fluorosis. Because of the side effects upon overexposure of fluoride, there is a need to develop fast and straight forward methods to sensitively and selectively detect and quantify fluoride concentration in drinking water. With this goal in mind and by taking advantage of …

Supervised Classification Of Benthic Reflectance In Shallow Subtropical Waters Using A Generalized Pixel-Based Classifier Across A Time Series, Tara Blakey, Assefa M. Melesse, Margaret O. Hall

Department of Earth and Environment

We tested a supervised classification approach with Landsat 5 Thematic Mapper (TM) data for time-series mapping of seagrass in a subtropical lagoon. Seagrass meadows are an integral link between marine and inland ecosystems and are at risk from upstream processes such as runoff and erosion. Despite the prevalence of image-specific approaches, the classification accuracies we achieved show that pixel-based spectral classes may be generalized and applied to a time series of images that were not included in the classifier training. We employed in-situ data on seagrass abundance from 2007 to 2011 to train and validate a classification model. We created …

Search For Pair-Produced Resonances Decaying To Jet Pairs In Proton–Proton Collisions At √S=8tev, Cms Collaboration, Cern Switzerland, Samantha Hewamanage, Stephan Linn, Pete Markowitz, German Martinez, Jorge Luis Rodriguez

Department of Physics

Results are reported of a general search for pair production of heavy resonances decaying to pairs of hadronic jets in events with at least four jets. The study is based on up to 19.4fb−1of integrated luminosity from proton–proton collisions at a center-of-mass energy of 8TeV, recorded with the CMS detector at the LHC. Limits are determined on the production of scalar top quarks (top squarks) in the framework of R-parity violating supersymmetry and on the production of color-octet vector bosons (colorons). First limits at the LHC are placed on top squark production for two scenarios. The first assumes decay to …

Search For Quark Contact Interactions And Extra Spatial Dimensions Using Dijet Angular Distributions In Proton–Proton Collisions At √S=8tev, Cms Collaboration, Cern, Switzerland, Samantha Hewamanage, Stephan Linn, Pete E. Markowitz, German Martinez, Jorge Luis Rodriguez

Department of Physics

A search is presented for quark contact interactions and extra spatial dimensions in proton–proton collisions at √s=8TeVusing dijet angular distributions. The search is based on a data set corresponding to an integrated luminosity of 19.7fb−1collected by the CMS detector at the CERN LHC. Dijet angular distributions are found to be in agreement with the perturbative QCD predictions that include electroweak corrections. Limits on the contact interaction scale from a variety of models at next-to-leading order in QCD corrections are obtained. A benchmark model in which only left-handed quarks participate is excluded up to a scale of 9.0 (11.7)TeV for destructive …

Model Of Cost-Effectiveness Of Mri For Women Of Average Lifetime Risk Of Breast Cancer, Mckenna L. Kimball

Scholarly and Creative Works Conference (2015 - 2021)

Background: Mammography is the current standard for breast cancer detection however magnetic resonance imaging (MRI) is a more sensitive method of breast imaging. Despite MRI’s increased sensitivity, MRI has more false positives and higher costs. The purpose of this study was to determine if MRI or MRI in conjunction with mammography was a cost-effective solution for breast cancer detection in women with average lifetime risk of breast cancer.

Methods: A mathematical model was used to compare annual mammography, annual MRI, and mammography and MRI on alternate years. The model included the natural history of breast cancer, screening by mammography …

Welcome To The Machine: Privacy And Workplace Implications Of Predictive Analytics, Robert Sprague

Robert Sprague