Engineering Commons^™

Comparative Safety Analysis Of Accelerator Driven Subcritical Systems And Critical Nuclear Energy Systems, Run Luo, Shripad Revankar, Fuyu Zhao

School of Nuclear Engineering Faculty Publications

The accelerator driven subcritical system (ADS) has been chosen as one of the best candidates for Generation IV nuclear energy systems which could not only produce clean energy but also incinerate nuclear waste. The transient characteristics and operation principles of ADS are significantly different from those of the critical nuclear energy system (CNES). In this work, the safety characteristics of ADS are analyzed and compared with CNES by a developed neutronics and thermal-hydraulics coupled code named ARTAP. Three typical accidents are carried out in both ADS and CNES, including reactivity insertion, loss of flow, and loss of heat sink. The …

Exploring The Structural Uniformity And Integrity Of Protonic Ceramic Thin Film Electrolyte Using Wet Powder Spraying, Wuxiang Feng, Wei Wu, Congrui Grace Jin, Meng Zhou, Wenjuan Bian, Wei Tang, Joshua Y. Gomez, Richard Boardman, Dong Ding

Department of Civil and Environmental Engineering: Faculty Publications

Thin protonic ceramic electrolyte contributes to lower ohmic resistance and enhances electrochemical performance of protonic ceramic electrochemical cells. However, manufacturing of large-scale thin electrolyte remains a challenge. Wet powder spraying is an attractive technique to deposit <10 >μm thin electrolyte when advanced atomizing techniques and optimized spraying process are integrated. Here ultrasonic atomization is integrated in the wet powder spray technique to reduce the thickness of electrolyte. Moreover, a parametric study is conducted to optimize the wet powder spray process to deposit uniform and crack-free electrolyte film. It is illustrated that tuning of solid loading rates and spray passes can affect …

The Impact Of Cloud Computing On Academic Libraries, Sivankalai S

Library Philosophy and Practice (e-journal)

With the introduction of computers and other forms of communication technology, library services have undergone a significant transformation. Libraries have been automated, networked, and are currently being converted into virtual or paperless libraries. This article is dedicated to many aspects of cloud computing, including different kinds and applications. There is a discussion about the advantages and drawbacks of cloud computing in academic libraries. The article also includes recommendations for professional librarians and academic libraries across the globe on how to take advantage of cloud computing resources. This article may be of use in the development of cloud-based services for university …

Seaweed Polysaccharide In Food Contact Materials (Active Packaging, Intelligent Packaging, Edible Films, And Coatings), Kalpani Y. Perera, Shubham Sharma, Amit K. Jaiswal, Swarna Jaiswal

Articles

Food contact materials (FCMs) are materials that come in contact with food products such as food packaging which play a significant role in the food quality and safety. Plastic, which is a major food packaging material, harms the eco-system, wildlife, and the environment. As a result, numerous researches have been in progress on alternative polymers, which has similar properties as plastic but is also environmentally friendly (biodegradable). In recent years, the utilization of seaweed polysaccharides has piqued interest due to its biodegradability, non-toxicity, antioxidant capabilities, and excellent film formation ability. However, it has a number of drawbacks such as low …

College Of Engineering News, Georgia Southern University

College of Engineering & Computing: News & Publications (2010-2023)

• AIST grants 2021 Peaslee Award to Dr. Qing and Dr. Xu

A 3d Crossbar Architecture For Both Pipeline And Parallel Computations, John M. Acken, Muayad J. Aljafar

Electrical and Computer Engineering Faculty Publications and Presentations

A 3D architecture made up of a CMOS layer combined with a 3D stack of bipolar memristor crossbar arrays provides an innovative approach to hardware support for utilizing the strength of CMOS combined with the strength of memristors. Memristors have been evaluated for implementing a broad spectrum of applications such as memory, computations, hardware-based security primitives, cryptography, etc., and numerous studies have shown that memristors are desirable candidates for such applications. This paper proposes a novel 3D memristive crossbar architecture (i.e., a stack of memristive crossbar arrays built on top of CMOS substrate) with a specific focus on the way …

Dynamic Simulation Of A Novel Nuclear Hybrid Energy System With Large-Scale Hydrogen Storage In An Underground Salt Cavern, An Ho, Kasra Mohammadi, Matthew Memmott, John Hedengren, Kody Powell

Faculty Publications

In this study, a nuclear hybrid energy system (NHES) with large-scale hydrogen storage integrated with a gas turbine cycle is proposed as a flexible system for load following. The proposed system consists of a nuclear reactor, a steam Rankine cycle, a hydrogen electrolyzer, a storage system for hydrogen in an underground salt cavern, and a Brayton cycle that uses hydrogen as fuel to generate additional electricity to meet peak demand. A dynamic mathematical model is developed for each subsystem of the NHES. To evaluate the potential benefits of the system, a one-year study is conducted, using scaled grid demand data …

Engineering A High-Throughput Screening Platform For Assessing Developmental Neurotoxicity Throughout Head- Regeneration In Schmidtea Mediterranea, Johnathan James Morris

Theses and Dissertations

The increase in commercially used chemicals that are inadequately evaluated for safety and risk to development has created a reticent threat to human health. Addressing these deficiencies is compounded by limited methodologies to determine the etiology of exposure-related developmental neurotoxicity (DNT). Current means of assessing DNT are largely retrospective and limited by the expensive, time-consuming, and labor-intensive use of laboratory animal models, thereby motivating a global research effort to produce alternative chemical screening assays. In this work, we have developed a novel high- throughput platform that serves as a new tool to evaluate the effects of exogenous chemical exposure on …

Acclimation Of Contact Impedance And Wrist-Based Pulsatile Signal Measurements Through Electrical Bioimpedance, Diego A. Leon

Theses and Dissertations

The purpose of this research is to expand the understanding of certain properties of electrodes used for electrical bioimpedance measurements. Specifically, this work investigates the acclimation effect of the skin-electrode interface contact impedance. It also attempts to study the relationship between electrode spacing and amplitude of bioimpedance pulsatile signals. It was found that as soon as dry electrodes are placed on the skin, the contact impedance exponentially decreases until it reaches a constant level. The acclimation time, time to reach a constant contact impedance, is dependent of the electrode size and frequency. Increasing the size of the electrode, as well …

Fluid-Cooled Compact X-Ray Tube And System Including The Same, Hyoung-Koo Lee, V Ashish Avachat, Wesley William Tucker

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

A fluid-cooled compact x-ray system includes a compact x-ray tube and a coolant channel coupled thereto. The compact x-ray tube includes a tube housing defining a longitudinal axis, and an electron source in the tube housing and coaxial with the tube housing. The electron source is configured to generate an electron beam. The compact x-ray tube also includes an anode coaxial with the tube housing, the anode defining a plane perpendicular to the longitudinal axis and including a target material, and an electron focusing mechanism in the tube housing and configured to focus and accelerate the electron beam to the …

Characterization Of Foamed Warm-Mix Asphalt For Workability And Moisture Damage, Biswajit Kumar Bairgi

Civil Engineering ETDs

Warm mix asphalt (WMA) technology reduces the high mixing and compaction temperatures of conventional hot mix asphalt (HMA) by approximately 10 ^°C to 40 ^°C. In WMA technology, instead of increasing the binder-aggregate temperature, the volume of asphalt is increased by injecting water into hot asphalt at high air pressure. The amount of water injected in the binder is typically determined by a trial and error process and is termed as foaming water content (FWC). Once the FWC is in contact with the hot asphalt binder, it turns into vapor with a rapid volume expansion due …

High-Frequency And Below Bandgap Anisotropic Dielectric Constants In Α-(AlXGa1-X)2O3 (0≤X≤1), Matthew Hilfiker, Ufuk Kilic, Megan Stokey, Riena Jinno, Yongjin Cho, Huili Grace Xing, Debdeep Jena, Rafal Korlacki, Mathias Schubert

Department of Electrical and Computer Engineering: Faculty Publications

A Mueller matrix spectroscopic ellipsometry approach was used to investigate the anisotropic dielectric constants of corundum α-(Al_xGa_1-x)₂O₃ thin films in their below bandgap spectral regions. The sample set was epitaxially grown using plasma-assisted molecular beam epitaxy on m-plane sapphire. The spectroscopic ellipsometry measurements were performed at multiple azimuthal angles to resolve the uniaxial dielectric properties. A Cauchy dispersion model was applied, and high-frequency dielectric constants are determined for polarization perpendicular (ε_∞,⟂) and parallel (ε_∞,∥) to the thin film c-axis. The optical birefringence is negative throughout the …

Dynamic Stochastic Joint Expansion Planning Of Power Systems, Natural Gas Networks, And Electrical And Natural Gas Storage, Arash Gholami, Hamed Nafisi, H. Askarian A., Ali Jahanbani Ardakani

Articles

Over the last decades, electricity generation from natural gas has substantially increased, mostly driven by low natural gas prices due to fracturing and lower extraction costs. The geographic distance between natural gas resources and load centers calls for a holistic tool for joint expansion of power systems and natural gas networks. In this paper, a Dynamic Stochastic Joint Expansion Planning (DSJEP) of power systems and natural gas networks is proposed to minimize the investment and operational costs of power and natural gas systems. Electrical and natural gas storage (ENGS) are considered as an option for decision-makers in the DSJEP problem. …

Electroanalytical Measurements Of Oxide Ions In Molten Cacl2 On W Electrode, Devin Rappleye, Chao Zhang, Art Nelson, Scott Simpson, Michael Simpson

Faculty Publications

The electrochemical interaction of oxide ions with tungsten electrodes in molten calcium chloride (CaCl₂) was analyzed by combining electroanalytical techniques with X-ray photoelectron spectroscopy. During a cyclic voltammetry (CV) scan, the oxide ions appear to interact with the tungsten working electrode via a multi-step oxidation and reduction process. The overall redox peaks behave reversibly up to 750 mV/s. This electrochemical process enables the oxide ion concentration to be correlated to CV oxidation peaks. The resulting correlation agrees well (8.8% difference) with back titration measurements and can be used to monitor oxide content in the salt in real-time during …

Diksuchi Bi-Annual Newsletter Department Of Civil Engineering Volume I, Issue 1 & 2, Purushotham G. Sarvade Dr

Faculty work

No abstract provided.

Application Of Tilt Correlation Statistics To Anisoplanatic Optical Turbulence Modeling And Mitigation, Russell C. Hardie, Michael A. Rucci, Santasri Bose-Pillai, Richard Van Hook

Electrical and Computer Engineering Faculty Publications

Atmospheric optical turbulence can be a significant source of image degradation, particularly in long range imaging applications. Many turbulence mitigation algorithms rely on an optical transfer function (OTF) model that includes the Fried parameter. We present anisoplanatic tilt statistics for spherical wave propagation. We transform these into 2D autocorrelation functions that can inform turbulence modeling and mitigation algorithms. Using these, we construct an OTF model that accounts for image registration. We also propose a spectral ratio Fried parameter estimation algorithm that is robust to camera motion and requires no specialized scene content or sources. We employ the Fried parameter estimation …

Scene Motion Detection In Imagery With Anisoplanatic Optical Turbulence Using A Tilt-Variance-Based Gaussian Mixture Model, Richard L. Van Hook, Russell C. Hardie

Electrical and Computer Engineering Faculty Publications

In long-range imaging applications, anisoplanatic atmospheric optical turbulence imparts spatially- and temporally varying blur and geometric distortions in acquired imagery. The ability to distinguish true scene motion from turbulence warping is important for many image-processing and analysis tasks. The authors present a scenemotion detection algorithm specifically designed to operate in the presence of anisoplanatic optical turbulence. The method models intensity fluctuations in each pixel with a Gaussian mixture model (GMM). The GMM uses knowledge of the turbulence tilt-variance statistics. We provide both quantitative and qualitative performance analyses and compare the proposed method to several state-of-the art algorithms. The image data …

Scope Process: Fostering Students' Design Outcome Effectiveness, Andrew J. Hughes, Cameron D. Denson

Educational Leadership & Technology Faculty Publications

The purpose of this article is to help Technology and Engineering Educators scaffold engineering design and problem-solving experiences so that students taking technology and engineering courses will develop an improved ability to design. Technology and Engineering Education seems to increasingly focus on problem-solving, design, and engineering. Technology and Engineering Education is not the only discipline with this focus. The fact that both Science and Technology and Engineering Education are similarly focused on the teaching and learning of engineering begs the question of what separates technology and engineering educators from science educators in the teaching of engineering? Lewis (2004) cautioned that …

Mechanism Design And Analysis: Developing An Understanding Of Mechanism Motion Through Graphical Modeling, Andrew J. Hughes, Chris Merrill

Educational Leadership & Technology Faculty Publications

The intention of this article is to provide Technology and Engineering Educators with foundational knowledge of mechanism design and analysis and the ability to develop middle and high school students' mechanism knowledge during practical hands-on learning activities in the STEM classroom. Technology and Engineering Educators' implementation of mechanism design and analysis could promote students' increased depth of mechanical knowledge and ability to apply this knowledge during engineering design challenges. In this article, the authors present an introduction to four-bar mechanism design and analysis using CAD software to produce graphical representations. After designing mechanisms graphical, students should be allowed to produce …

Engineering Research Review 2021, Office Of Engineering Research

Engineering Research Review

Table of Contents:

[Page] 2 Kavasseri launches new research initiatives
[Page] 3 PowerJacks develop techniques to integrate renewable energy
[Page] 4 Data-driven model helps mix renewable, traditional energy sources
[Page] 6 National laboratories fuel technology commercialization, student success
[Page] 8 Energy management algorithms improve grid resiliency
[Page] 9 SDSU engineers use satellite images to protect national security
[Page] 10 Computer vision may revolutionize structural inspection
[Page] 12 Senior design teams build human-carrying rotorcraft
[Page] 14 NIH grant to improve genomic analysis website
[Page] 16 College, university honor Ge, Zhou

Study Of Forward And Backward Modes In Double-Sided Dielectric-Filled Corrugated Waveguides, Pilar Castillo-Tapia, Francisco Mesa, Alexander Yakovlev, Guido Valerio, Oscar Quevedo-Teruel

Faculty and Student Publications

This work studies the propagation characteristics of a rectangular waveguide with aligned/ misaligned double-sided dielectric-filled metallic corrugations. Two modes are found to propagate in the proposed double-sided configuration below the hollow-waveguide cutoff frequency: a quasi-resonant mode and a backward mode. This is in contrast to the single-sided configuration, which only allows for backward propagation. Moreover, the double-sided configuration can be of interest for waveguide miniaturization on account of the broader band of its backward mode. The width of the stopband between the quasi-resonant and backward modes can be controlled by the misalignment of the top and bottom corrugations, being null …

A Two-Stage Peer-To-Peer Energy Trading Model For Distribution Systems With Participation Of Utility, Y. Liu, L. Wu, Jie Li

Henry M. Rowan College of Engineering Departmental Research

With the growing penetration of distributed energy resources (DER) in distribution systems, the traditional utility dominated tariff-based business model may no longer meet the need for further development. As a result, the transformation from the traditional tariff-based business model to the emerging peer-to-peer energy trading model has been acknowledged by researchers and policy makers. In this paper, a two-stage peer-to peer energy trading model is proposed while considering the role of the utility. Specifically, energy transactions between buyers and sellers are optimized in the first stage; the cleared transactions are submitted to the utility for approval in the second stage, …

Fire Protection System Analysis Of Air National Guard Readiness Center, Steven A. Waidelich

Fire Protection Engineering: Culminating Experience Project Reports

This report analyzes the impact of a fire located in the atrium at the Air National Guard Readiness Center (ANGRC) located at Joint Base Andrews, Maryland. The fifth floor is an enclosed penthouse used to enclose mechanical and electrical equipment. International Building Code (IBC) 2006 and 2005, section 506.1, excludes elevator penthouses of this type from the height and area calculations. The four occupied floors are used for office areas with the three- story atrium opening onto the balcony of the second- and the third-floor office area, and the second-floor conference center.

The prescriptive portion of this analysis looked at …

Bonderson Engineering Center, Hannah Curry

Fire Protection Engineering: Culminating Experience Project Reports

As part of the requirements for receiving a Master of Science in Fire Protection Engineering from California Polytechnic State University at San Luis Obispo, a Fire and Life Safety Analysis of the Bonderson Engineering Projects Center located on the Cal Poly San Luis Obispo campus is performed. The analysis consists of both a prescriptive and a performance-based analysis.

The prescriptive analysis focuses on reviewing the as-built conditions within the Bonderson Engineering Projects Center for compliance with the current edition of applicable codes and standards. The analysis is performed using the 2018 Edition of the International Building Code (IBC) and the …

Assessment Of Streamflow Predictions Generated Using Multimodel And Multiprecipitation Product Forcing, Bong Chul Seo, Witold F. Krajewski, Felipe Quintero, Steve Buan, Brian Connelly

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This study assesses streamflow predictions generated by two distributed hydrologic models, the Hillslope Link Model (HLM) and the National Water Model (NWM), driven by three radar-based precipitation forcing datasets. These forcing data include the Multi-Radar Multi-Sensor (MRMS), and the Iowa Flood Center's single-polarization-based (IFC-SP) and dual-polarization-based (IFC-DP) products. To examine forcing-and model-dependent aspects of the representation of hydrologic processes, we mixed and matched all forcing data and models, and simulated streamflow for 2016–18 based on six forcing–model combinations. The forcing product evaluation using independent ground reference data showed that the IFC-DP radar-only product's accuracy is comparable to MRMS, which is …

Reinforcement Learning Algorithms: An Overview And Classification, Fadi Almahamid, Katarina Grolinger

Electrical and Computer Engineering Publications

The desire to make applications and machines more intelligent and the aspiration to enable their operation without human interaction have been driving innovations in neural networks, deep learning, and other machine learning techniques. Although reinforcement learning has been primarily used in video games, recent advancements and the development of diverse and powerful reinforcement algorithms have enabled the reinforcement learning community to move from playing video games to solving complex real-life problems in autonomous systems such as self-driving cars, delivery drones, and automated robotics. Understanding the environment of an application and the algorithms’ limitations plays a vital role in selecting the …

Effect Of Crystal Quality On Twinning Stress In Ni–Mn–Ga Magnetic Shape Memory Alloys, Andrew Armstrong, Peter Müllner

Materials Science and Engineering Faculty Publications and Presentations

Low twinning stress (TS) is a prerequisite for magnetic shape memory functionality in ferromagnetic martensites. We compare Ni₅₀Mn₂₈Ga₂₂ (nominal at.%) single crystals from four different producers to reveal the effect of crystal quality on the TS. Near the reverse martensite transformation, the TS is generally low, about 1 MPa, regardless of mosaicity of up to 1.7° and chemical composition deviations of up to 2 at.% of Mn. Pure type I and type II twin boundaries occur in crystals with smooth chemical composition gradients. The corresponding temperature dependences of TS follow universal linear trends with the …

How The Pavement's Lifetime Depends On The Stress Level: An Explanation Of The Empirical Formula, Edgar Daniel Rodriguez Velasquez, Vladik Kreinovich, Olga Kosheleva, Hoang Phuong Nguyen

Departmental Technical Reports (CS)

We show that natural invariance ideas explain the empirical dependence on the pavement's lifetime on the stress level.

Long Term Field Emission Current Stability Characterization Of Planar Field Emitter Devices, Ranajoy Bhattacharya, Marco Turchetti, P. Donald Keathley, Karl K. Berggren, Jim Browning

Electrical and Computer Engineering Faculty Publications and Presentations

Lateral field emission devices have been characterized and degradation tested for >1000 h to study stability and reliability. Two types of planar device structures, diode and bowtie, were studied. These nanoscale devices have 10–20 nm tip to tip or tip to collector dimensions with the tips fabricated from Au/Ti. Typical currents of 2–6 nA at 6 V were measured. The devices were placed on lifetime tests in a vacuum of < 10⁻⁸ Torr and biased at 6 V DC for >1000 h. Seven total devices were tested with one failing at 300 h. and three of the devices showed < 5% degradation in current until 1400 h when testing was stopped, and three other devices showed a sudden drop of ≈20% ranging from 700 to 900 h. Optical microscope images of one of the devices that failed catastrophically at 350 h show physical arc damage where the bond pad narrows to the emitter trace. Scanning electron microscope images of a bowtie part that completed 1400 h of operation showed no obvious erosion or damage to the tips.

A New Feature Extraction Approach For Script Invariant Handwritten Numeral Recognition, Pawan Kumar Singh, Iman Chatterjee, Ram Sarkar, Elisa Barney Smith, Mita Nasipuri

Electrical and Computer Engineering Faculty Publications and Presentations

Handwritten numeral recognition is a challenging research problem because of the enormous varieties of styles in which human beings write the numerals. Several researchers have tried to find solutions to this problem with exceptional recognition accuracies. However, most of these solutions have been dedicated to single script numerals. Such methods are inappropriate for multi-lingual nations such as India where a large number of scripts are used. Keeping this issue in mind, a new feature descriptor named symbolization of binary images (SBI) is introduced here for the recognition of handwritten numerals of different scripts. Effectiveness of SBI is supported …