Digital Commons Network^™

A Study Of Scattering From Snow Embedded With Non-Spherical Shapes Of Scatterers With Relaxed Hierarchical Equivalent Source Algorithm (Rhesa), Chan Fai Lum, Fu Xin, Hong Tat Ewe, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Remote sensing has been used widely in studying the earth terrain such as snow or sea ice due to its fast, convenient and long-term monitoring capabilities. SAR images acquired could be used to analyze the condition of snow, snow water equivalent (SWE), surface roughness and others. Theoretical models have also been developed to understand how microwave interacts with the snow medium and the scatterers embedded inside the medium. Conventionally, spherical shape of scatterers is commonly used to represent the ice particles embedded inside snow where the actual shape of scatterers can vary. This paper is to present a theoretical model …

The Error Control Of Mixed-Form Fast Multipole Algorithm Based On The High-Order Multipole Rotation, Ling Ling Meng, Xiaoyan Y.Z. Xiong, Tian Xia, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

In this letter, the mixed-form fast multipole algorithm (MF-FMA) with feasible error controllability is implemented through high-order multipole rotation that can make the translation matrices very sparse. The saving of both storage and CPU time makes it attainable to increase the number of harmonics in the middle frequency regime, thus shifting up the transition region of MF-FMA. Consequently, the broadband accuracy of the MF-FMA can be improved significantly.

Ultrathin Complementary Metasurface For Orbital Angular Momentum Generation At Microwave Frequencies, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha

Electrical and Computer Engineering Faculty Research & Creative Works

Electromagnetic (EM) waves with helical wave front carry orbital angular momentum (OAM), which is associated with the azimuthal phase of the complex electric field. OAM is a new degree of freedom in EM waves and is promising for channel multiplexing in the communication system. Although the OAM-carrying EM wave attracts more and more attention, the method of OAM generation at microwave frequencies still faces challenges, such as efficiency and simulation time. In this communication, by using the circuit theory and equivalence principle, we build two simplified models, one for a single scatter and one for the whole metasurface to predict …

Volterra Series-Based Time-Domain Macromodeling Of Nonlinear Circuits, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Jose E. Schutt-Aine, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

Volterra series (VS) representation is a powerful mathematical model for nonlinear circuits. However, the difficulties in determining higher order Volterra kernels limited its broader applications. In this paper, a systematic approach that enables a convenient extraction of Volterra kernels from X-parameters is presented. A concise and general representation of the output response due to arbitrary number of input tones is given. The relationship between Volterra kernels and X-parameters is explicitly formulated. An efficient frequency sweep scheme and an output frequency indexing scheme are provided. The least square linear regression method is employed to separate different orders of Volterra kernels at …

Fretting Wear Behaviors Of Aluminum Cable Steel Reinforced (Acsr) Conductors In High-Voltage Transmission Line, Xingchi Ma, Lei Gao, Junxi Zhang, Laichang Zhang

Research outputs 2014 to 2021

This work reports the fretting wear behavior of aluminum cable steel reinforced (ACSR) conductors for use in high-voltage transmission line. Fretting wear tests of Al wires were conducted on a servo-controlled fatigue testing machine with self-made assistant apparatus, and their fretting process characteristics, friction force, wear damage, and wear surface morphology were detailed analyzed. The results show that the running regime of Al wires changes from a gross slip regime to a mixed regime more quickly as increasing contact load. With increasing amplitudes, gross slip regimes are more dominant under contact loads of lower than 30 N. The maximum friction …

Participatory Action And Dual Lens Research, Francesca Robertson, Jason Barrow, Magdalena Wajrak, Noel Nannup, Caroline Bishop, Alison Nannup

Research outputs 2014 to 2021

Purpose

The purpose of this paper is to explore the idea that, in the last few decades, collaborative inquiry methods have evolved along a similar trajectory to dual lens research. Dual lens research, known in various contexts as both ways, two-eyed seeing Old Ways New Ways, and Koodjal Jinnung (looking both ways), is designed to generate new knowledge by exploring a theme through Aboriginal and contemporary western lenses. Participatory action research and a dual lens approach are considered in a number of projects with a particular focus on the issues such work can raise including conceptual challenges posed by fundamental …

Text Summarization Techniques: A Brief Survey, Mehdi Allahyari, Seyedamin Pouriyeh, Mehdi Assefi, Saeid Safaei, Elizabeth D. Trippe, Juan B. Gutierrez, Krys Kochut

Computing: Faculty Publications

In recent years, there has been a explosion in the amount of text data from a variety of sources. This volume of text is an invaluable source of information and knowledge which needs to be effectively summarized to be useful. Text summarization is the task of shortening a text document into a condensed version keeping all the important information and content of the original document. In this review, the main approaches to automatic text summarization are described. We review the different processes for summarization and describe the effectiveness and shortcomings of the different methods.

Faculty Senate Librarian's Report 2017 Combined, Georgia Southern University

Faculty Senate: Librarian's Reports

No abstract provided.

Sensitizing Humans To Fish Sentience, Kelly Levenda

Animal Sentience

Although fish can feel pain and suffer, they are not often protected legally. Jonathan Balcombe’s What a Fish Knows provides a timely and important contribution to the literature on animal cognition and sentience. By explaining their personalities and capabilities, Balcombe brings much needed public attention to fish and advances the principle that they need and deserve protection.

2016-2017 Georgia Southern University Men's Golf Statistics, Georgia Southern University

Men's Golf Records

• Georgia Southern Eagles 2016-17 Men's Golf Statistics

2016-2017 Georgia Southern University Women's Golf Statistics, Georgia Southern University

Women's Golf Records

• Georgia Southern Eagles 2016-17 Women's Golf Statistics

2017 Georgia Southern University Men's Soccer Media Guide, Georgia Southern University

Men's Soccer Records

• Georgia Southern 2017 Men's Soccer Media Guide & Record Book

2017 Georgia Southern University Women's Soccer Media Guide, Georgia Southern University

Women's Soccer Records

• Georgia Southern Women's Soccer 2017 Media Guide & Record Book

Integration As A Means Of Restoring Democracy And Opportunity, Sheryll Cashin

Georgetown Law Faculty Publications and Other Works

This paper was originally presented at A Shared Future: Fostering Communities of Inclusion in an Era of Inequality, a national symposium hosted by the Harvard Joint Center for Housing Studies in April 2017. The symposium examined how patterns of residential segregation by income and race in the United States are changing and the consequences of residential segregation for individuals and society, and sought to identify the most promising strategies for fostering more inclusive communities in the years to come.

This paper was presented as part of Panel 1 at the symposium, entitled “Defining Objectives and the Rationale for Action.”

Using Pairwise Comparisons In The Online Social Moderation Of Performance Assessment, C. Paul Newhouse, Pina Tarricone

Research outputs 2014 to 2021

Assessing the performance of a student involves some form of judgement, and where more than one assessor is involved this usually requires some form of moderation to ensure consistent and fair results. Often this involves meetings or communication between assessors, which is referred to as social moderation. This paper reports on a study that investigated the use of online technologies to support a form of social moderation of artworks submitted for assessment in a senior secondary school course in Western Australia. Online systems were used to facilitate communications and provide access to digital representations of the submissions along with assessment …

A Ten-Year-Old’S Use Of Creative Content To Construct An Alternative Future For Herself, Lelia Rosalind Green, Kylie Justine Stevenson

Research outputs 2014 to 2021

The Hand Up Linkage project focuses on the family as a communication context through which to explore the dynamics of intergenerational welfare dependency. In particular, it explores ways that creative life-course interventions might allow children in welfare dependent families to construct alternative realities for themselves and alternative views of their future. Formed through an alliance between a key Western Australian social welfare not-for-profit organisation, St Vincent de Paul WA (SVDPWA and also, in the context of volunteers, ‘Vinnies’), and Edith Cowan University, the project aims to address the organisation’s vision to provide “a hand up” (St Vincent 1) rather than …

Jiann-Ping Hsu College Of Public Health Magazine, Georgia Southern University

College of Public Health: News & Publications

• A Message from the Dean
• In Retrospect
• Alarming Obesity Study
• How Safe are Public Schools?
• On the Front Lines of a Plague
• Faculty Spotlight
• Research Spotlight
• Study Shows Mothers are More Sleep-deprived
• Student Spotlight
• Alumni Spotlight

Investigation Of Local Velocities And Phase Holdups, And Flow Regimes And Maldistribution Identification In A Trickle Bed Reactor, Mohd Fitri Bin Abdul Rahman

Doctoral Dissertations

"Trickle bed reactors are packed beds of catalyst on which gas and liquid reactants flow concurrently downward. In this work, the experimental work was carried out in 0.14 m diameter Plexiglas column using air-water system flowing over a packed bed of 3 mm glass bead particles. The local liquid and gas velocities, phase saturation and their time series have been investigated for the first time by developing, validating, and implementing a new two-tip optical fiber probe technique. It was found the radially and axially the liquid and gas velocities and their saturation vary and they also vary with times. In …

Magneto Inductive Communication System For Underwater Wireless Sensor Networks, Niaz Ahmed

Doctoral Dissertations

"Underwater wireless sensor networks have found a number of applications in underwater environment monitoring, infrastructure monitoring, military applications and ocean exploration. Among the four possible means of underwater wireless communication, namely acoustic, electromagnetic (EM), magneto-inductive (MI) and optics communication, MI communication enjoys the advantages of being low cost and robust equally in air, water and soil. This dissertation presents design and implementation of a low-power and low-cost MI sensor network node that is suited for long-term deployment of underwater and underground infrastructure monitoring, such as bridge scour and levee scour monitoring. The designed MI sensor node combat the directionality of …

Electron Impact Excitation-Ionization Of Molecules, Esam Abobakr A. Ali

Doctoral Dissertations

"In the last few decades, the study of atomic collisions by electron-impact has made significant advances. The most difficult case to study is electron impact ionization of molecules for which many approximations have to be made and the validity of these approximations can only be checked by comparing with experiment.

In this thesis, I have examined the Molecular three-body distorted wave (M3DW) or Molecular four-body distorted wave (M4DW) approximations for electron-impact ionization. These models use a fully quantum mechanical approach where all particles are treated quantum mechanically and the post collision interaction (PCI) is treated to all orders of perturbation. …

Biomarker Discovery Using Urinary Metabolomics For Noninvasive Early Cancer Detection, Casey Franklin Burton

Doctoral Dissertations

"The development of new screening methods for the early detection of cancer remains one of the foremost challenges facing modern cancer research. The emergence of new analytical technologies and their application to 'omics'-based approaches has provided researchers with powerful new tools for molecular biomarker discovery that may benefit early screening of cancer. This dissertation outlines several key advances made toward the application of urinary metabolomics to cancer biomarker discovery. The term urinary metabolomics here refers to the investigation of small metabolites in urine as potential disease biomarkers. The advantage of using this approach lies in its noninvasive sampling characteristics and …

Processing, Microstructure, And Mechanical Properties Of Zirconium Diboride-Molybdenum Disilicide Ceramics And Dual Composite Architectures, Ryan Joseph Grohsmeyer

Doctoral Dissertations

"This research had two objectives: characterization of processing-microstructure-mechanical property relationships of conventional ZrB₂-MoSi₂ ceramics at room temperature (RT) and 1500⁰C in air, and fabrication of ZrB₂-MoSi₂ dual composite architectures (DCAs) for use near 1500⁰C. Elastic moduli, fracture toughness, and flexure strength were measured at RT and 1500⁰C for 15 ZrB₂-MoSi₂ ceramics hot pressed using fine, medium, or coarse ZrB₂ starting powder with 5-70 vol.% MoSi₂, referred to as FX, MX, and CX respectively where X is the nominal MoSi₂ content. MoSi₂ decomposed during sintering, resulting in …

The Use Of Geophysical Methods For Dam Seepage Investigations And Dredged Oyster Deposit Characterization, Stanley Chinedu Nwokebuihe

Doctoral Dissertations

"The dissertation is made up of three papers, which discuss the utility of geophysical tools in earthfill dam investigations and dredged oyster bed characterization.

In the first paper, an earthfill dam in Warren County, Missouri was effectively investigated for seepage through the dam and its outlet works using an integration of the electrical resistivity tomography, induced polarization and spontaneous potential geophysical tools. Recommendations were subsequently made based on the results of the study on grout locations to prevent further seepage. In the second paper, a similar study of earthfill dam seepage was conducted on a different dam in Southern Missouri. …

Rapid Quantification Of Trypsin Inhibitors In Food And Feed Formulations With Electrospray Ionization Mass Spectrometry, Radheshyam Panta

Doctoral Dissertations

"Presence of anti- nutrients deteriorate the nutritional value of animal foods and feed formulations. The important one being trypsin inhibitors. Trypsin inhibitors in food and feed formulations lower the protein supplement and hence the ultimate consequence is the decrease in growth and development of animals. It is therefore, crucial to monitor trypsin inhibitors in animal food and feed formulations. Research work mentioned in this dissertation is based on the development of rapid, more accurate and robust method for determination of trypsin inhibitor in food and feed formulations. The developed method includes extraction of trypsin inhibitor from food and feed formulation …

Randomized Encoding Of Combinational And Sequential Logic For Resistance To Hardware Trojans, Travis Edward Schulze

Doctoral Dissertations

"Globalization of micro-chip fabrication has opened a new avenue of cyber-crime. It is now possible to insert hardware Trojans directly into a chip during the manufacturing process. These hardware Trojans are capable of destroying a chip, reducing performance or even capturing sensitive data. To date, defensive methods have focused on detection of the Trojan circuitry or prevention through design for security methods.

This dissertation presents a shift away from prevention and detection to a design methodology wherein one no longer cares if a Trojan is present or not. The Randomized Encoding of Combinational Logic for Resistance to Data Leakage or …

Modeling Dynamic Community Acceptance Of Mining Using Agent-Based Modeling, Mark Kofi Boateng

Doctoral Dissertations

"This research attempts to provide fundamental understanding into the relationship between perceived sustainability of mineral projects and community acceptance. The main objective is to apply agent-based modeling (ABM) and discrete choice modeling to understand changes in community acceptance over time due to changes in community demographics and perceptions. This objective focuses on: 1) formulating agent utility functions for ABM, based on discrete choice theory; 2) applying ABM to account for the effect of information diffusion on community acceptance; and 3) explaining the relationship between initial conditions, topology, and rate of interactions, on one hand, and community acceptance on the other …

Geophysical Assessment Of Soil And Rock In The New Madrid Seismic Zone, Faraj Mohamed Eljabri

Doctoral Dissertations

"The research presented here consists of two case studies: the first from a study site in Illinois and the second from a site in Arkansas. In both instances, geophysical investigations were conducted to characterize the subsurface. At the Illinois site, borehole control, downhole seismic (DHS), seismic refraction tomography (SRT) and multichannel analysis of surface waves (MASW) data were acquired for the purpose of seismic site characterization. Shear wave and compressional wave velocities were used to estimate depth to bedrock and to generate 1-D plots depicting variations in Poisson's Ratio, elastic moduli and density. The average shear wave velocity in the …

Development Of Active Microwave Thermography For Structural Health Monitoring, Ali Foudazi

Doctoral Dissertations

"Active Microwave Thermography (AMT) is an integrated nondestructive testing and evaluation (NDT&E) method that incorporates aspects of microwave NDT and thermography techniques. AMT uses a microwave excitation to generate heat and the surface thermal profile of the material or structure under test is subsequently measured using a thermal camera (or IR camera). Utilizing a microwave heat excitation provides advantages over traditional thermal excitations (heat lamps, etc.) including the potential for non-contact, selective and focused heating. During an AMT inspection, two heating mechanisms are possible, referred to as dielectric and induction heating. Dielectric heating occurs as a result of the interaction …

Modal Based Bga Modeling In High-Speed Package, Shuai Jin

Doctoral Dissertations

"In the Section 1, the improved "Root-Omega" method for extracting dielectric properties from fabricated multilayer printed circuit boards is proposed. Based on the electrical properties of fabricated transmission lines, the improved "Root-Omega" method applied to cases with smooth and rough conductors is validated using simulations. Error sensitivity analysis is performed to demonstrate the potential errors in the original "Root-Omega" procedure and the error sensitivity is significantly reduced by the proposed improvements.

In the Section 2, a fast modal-based approach is developed to accurately and efficiently capture the proximity effect. Image theory is also applied in the proposed approach to reduce …

Characterization And Numerical Simulation Of The Microstructural And Micromechanical Viscoelastic Behavior Of Oil Sands Using The Discrete Element Method, Eric Kofi Gbadam

Doctoral Dissertations

"Oil sands are naturally geologic formations of predominantly quartz sand grains whose void spaces are filled with bitumen, water, and dissolved gases. The electric rope shovel is the primary equipment used for excavating the Athabasca oil sand formations. The equipment's static and dynamic loads are transferred to the formation during excavation and propel. These loads cause ground instability leading to sinkage or rutting, crawler wear, and fracture failures. These problems result in unplanned downtimes, production losses, and high maintenance costs. In order to address these problems, there is a need to develop valid models that capture the behavior and performance …