Engineering Commons^™

Long-Term Cell Testing Of Interlayer-Free Lanthanum Strontium Cobalt Ferrite Cathodes For Solid Oxide Fuel Cells, Gianfranco Digiuseppe, Venkatesh Boddapati, Hiten Mothikhana

Mechanical Engineering Publications

Sub-stoichiometric LSCF nanopowders with composition of (La0.6Sr0.40)0.95Co0.2Fe0.80O3-d were prepared using a nitrate-glycine process. The particle size is estimated to be 28.8 nm using the Scherrer equation. A sintering study and pull test was done to determine the quality of LSCF adhesion to the YSZ electrolyte. It was found that firing the cathode at 850oC does not provide the best adhesion, but button cell testing data indicate that the performance is stable over relatively long-term tests. The cell performance is not up to par to state-of-the-art Ni-YSZ/YSZ/SDC/LSCF where a barrier layer is used and the cathode is fired at high temperatures. …

The Aspergillus Flavus Homeobox Gene, Hbx1, Is Required For Development And Aflatoxin Production, Jeffrey W. Cary, Pamela Y. Harris-Coward, Leslie Scharfenstein, Brian M. Mack, Perng-Kuang Chang, Qijian Wei, Matthew Lebar, Carol Carter-Wientjes, Rajtilak Majumdar, Chandrani Mitra, Sourav Banerjee, Anindya Chanda

Faculty Publications

Homeobox proteins, a class of well conserved transcription factors, regulate the expression of targeted genes, especially those involved in development. In filamentous fungi, homeobox genes are required for normal conidiogenesis and fruiting body formation. In the present study, we identified eight homeobox (hbx) genes in the aflatoxin-producing ascomycete, Aspergillus flavus, and determined their respective role in growth, conidiation and sclerotial production. Disruption of seven of the eight genes had little to no effect on fungal growth and development. However, disruption of the homeobox gene AFLA_069100, designated as hbx1, in two morphologically different A. flavus strains, CA14 and AF70, resulted in …

Multiple Scattering Theory For Polycrystalline Materials With Strong Grain Anisotropy: Theoretical Fundamentals And Applications, Huijing He

Department of Mechanical and Materials Engineering: Faculty Publications

This work is a natural extension of the author’s previous work: “Multiple scattering theory for heterogeneous elastic continua with strong property fluctuation: theoretical fundamentals and applications” (arXiv:1706.09137 [physics.geo-ph]), which established the foundation for developing multiple scattering model for heterogeneous elastic continua with either weak or strong fluctuations in mass density and elastic stiffness. Polycrystalline material is another type of heterogeneous materials that widely exists in nature and extensively used in industry. In this work, the corresponding multiple scattering theory for polycrystalline materials with randomly oriented anisotropic crystallites is developed. To validate the theory, the theoretical results for a series of …

Height Transitions, Shape Evolution, And Coarsening Of Equilibrating Quantum Nanoislands, Mikhail Khenner

Mathematics Faculty Publications

No abstract provided.

Floating-Gate Transistor Photodetector, Jinsong Huang, Yongbo Yuan

Department of Mechanical and Materials Engineering: Faculty Publications

A field effect transistor photodetector that can operate in room temperature includes a source electrode , a drain electrode , a channel to allow an electric current to flow between the drain and source electrodes , and a gate electrode to receive a bias voltage for controlling the current in the channel . The photodetector includes a light - absorbing mate rial that absorbs light and traps electric charges . The light absorbing material is configured to generate one or more charges upon absorbing light having a wavelength within a specified range and to hold the one or more charges …

Active Detection For Exposing Intelligent Attacks In Control Systems, Sean Weerakkody, Omur Ozel, Paul Griffioen, Bruno Sinopoli

Faculty Work Comprehensive List

In this paper, we consider approaches for detecting integrity attacks carried out by intelligent and resourceful adversaries in control systems. Passive detection techniques are often incorporated to identify malicious behavior. Here, the defender utilizes finely-tuned algorithms to process information and make a binary decision, whether the system is healthy or under attack. We demonstrate that passive detection can be ineffective against adversaries with model knowledge and access to a set of input/output channels. We then propose active detection as a tool to detect attacks. In active detection, the defender leverages degrees of freedom he has in the system to detect …

Information Technology News, Georgia Southern University

Information Technology: News & Publications (2012-2023)

• ROTC Cadet named AFCEA Medal of Honor scholarship recipient

How Law Enforcement Unmanned Aircraft Systems (Uas) Could Improve Tactical Response To Active Shooter Situations: The Case Of The 2017 Las Vegas Shooting, Ryan J. Wallace, Jon M. Loffi

International Journal of Aviation, Aeronautics, and Aerospace

Using a case study methodology, this paper assesses the unique tactical challenges faced by law enforcement officers responding to the October 1, 2017, Las Vegas active shooter incident. The authors assessed the tactical strengths of the assailant, Stephen Paddock, and challenges faced by law enforcement personnel. The authors present several proposed applications of unmanned aircraft systems that could have potentially mitigated the active shooter’s tactical advantages.

Note On The Rate And Energy Efficiency Limits For Additive Manufacturing, Timothy Gutowski, Sheng Jiang, Daniel Cooper, Gero Corman, Michael Hausmann, Jan-Anders Manson, Timo Schudeleit, Konrad Wegener, Matias Sabelle, Jorge Ramos-Grez, Dusan P. Sekulic

Mechanical Engineering Faculty Publications

We review the process rates and energy intensities of various additive processing technologies and focus on recent progress in improving these metrics for laser powder bed fusion processing of metals, and filament and pellet extrusion processing of polymers and composites. Over the last decade, observed progress in raw build rates has been quite substantial, with laser metal processes improving by about 1 order of magnitude, and polymer extrusion processes by more than 2 orders of magnitude. We develop simple heat transfer models that explain these improvements, point to other possible strategies for improvement, and highlight rate limits. We observe a …

College Of Engineering News, Georgia Southern University

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

• ROTC Cadet named AFCEA Medal of Honor scholarship recipient

Assessment Of Differences Between Near-Surface Air And Soil Temperatures For Reliable Detection Of High-Latitude Freeze And Thaw States, Farjana Shati, Satya Prakash, Hamid Norouzi, Reginald Blake

Publications and Research

Near-surface air temperature and the underlying soil temperature are among the key components of the Earth’s surface energy budget, and they are important variables for the comprehensive assessment of global climate change. Better understanding of the difference in magnitude between these two variables over high-latitude regions is also crucial for accurate detections of freeze and thaw (FT) states. However, these differences are not usually considered and included in current remote sensing-based FT detection algorithms. In this study, the difference between near-surface air temperature at the 2-meter height and soil temperature at the 5-centimeter depth is assessed using ground-based observations that …

Co-Existence Of Microbial Ecology In A Chemostat Using A Robust Feedback, Hector Puebla, Mariana Rodriguez-Jara, Margarita M. Gonzalez-Brambila, Eliseo Hernandez-Martinez, Alejandra Velasco-Perez, Ennio Piceno-Diaz

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Open Source Artificial Intelligence In A Biological/Ecological Context, Trevor Grant

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Deep Learning In R, Troy Hernandez

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Using Emerging Open Source Technolgies To Foster Reproducability In Research, Joe Olson

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Blended Wing Body Propulsion System Design, Parth Kumar, Adeel Khalid

International Journal of Aviation, Aeronautics, and Aerospace

This research paper focuses on the optimization of the propulsion system of a blended wing body design. Two different aspects of the design, the engine placement and count, and the engine itself, are investigated. The preliminary wing of the BWB is created through aerodynamic analysis, and is kept as a constant over the different propulsion system configurations. The engine parameters are first investigated. Equations are derived to express takeoff distance and climb rate as a function of engine sea level thrust, cruise thrust, and the number of engines. Nearly 150 different engine models, in BWB configurations of 2, 3, 4, …

Food Web Control And Synchronization Using A Robust Feedback, Hector Puebla, Mariana Rodriguez-Jara, Cesar S. Lopez-Monsalvo, Eliseo Hernandez-Martinez, Alejandra Velasco-Perez

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Implementation Of The Tickbot: Results And Implications For Modeling, Alexis White, Armin Bahrani, Amanda Devleeschower, Holly Gaff

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

Vfr-Into-Imc Accident Trends: Perceptions Of Deficiencies In Training, Wesley L. Major, Thomas Carney, Julius Keller, Allen Xie, Matt Price, John Duncan, Lori Brown, Geoffrey R. Whitehurst, William G. Rantz, Dominic Nicolai, Beth M. Beaudin-Seiler

Journal of Aviation Technology and Engineering

Pilots who operate under visual flight rules (VFR) and in visual meteorological conditions, who then continue flight into instrument meteorological conditions (IMC), remain as one of the leading causes of fatal aircraft accidents in general aviation. This paper examines past and current research initiatives, in seeking to identify causal factors and gaps in training that lead to VFR-into-IMC aircraft accidents, using a mixed methods approach. The Aircraft Owners and Pilots Association Air Safety Institute database and the National Transportation Safety Board database search engines were used to identify accident reports associated with VFR flight into IMC/deteriorating weather conditions for a …

Swbec Student Co-Authors A Publication | Sustainable Waste-To-Bioproducts Engineering Center, Usu College Of Engineering

College of Engineering News

SWBEC Student Tyler Marlar is co-author on the refereed publication "Effects of materials surface preparation for use in spacecraft potable water storage tanks," as part of his summer 2016 internship experience with NASA at the Johnson Space Center.

Project On Bioenergy Linked To Wastewater Treatment Selected For Funding By Ustar | Sustainable Waste-To-Bioproducts Engineering Center, Usu College Of Engineering

College of Engineering News

The Utah Science Technology and Research initiative has awarded the team consisting of Utah State University, WesTech-Inc., and the Central Valley Water Reclamation Facility a project titled “Bioenergy and Waste Reduction from Municipal Reclaimed Water” under the Industry-University Partnership Program (IPP).

Performance Evaluation Of Rice Husk Ash (Rha) Modified Concrete, Mohammad Badrul Ahsan

Student Theses and Dissertations

Rice husk ash (RHA) is an agricultural by-product that has the potential of a pozzolanic material. It can be used as a partial replacement of Ordinary Portland Cement (OPC) in concrete. The present study investigates the performance of RHA-modified concrete with two amounts (10% and 20% by weight) of three types of RHA. Test results of RHA-modified concrete samples have been compared with those of the Control (no RHA) as well as concrete modified with a commonly used modifier called Class C fly ash (CFA) with 10% replacement. Effects of alkali-silica reaction (ASR) and deicing chemicals have also been evaluated …

Datumate, Purdue Ect Team

ECT Fact Sheets Archive

Datumate is digitally transforming civil engineering processes used in construction, surveying and infrastructure inspection markets with fully automated, highly precise, cost effective and safe tools. It utilizes state-of-the-art image processing and advanced drones and camera technologies dramatically reducing the amount of time surveying crews spend in the field, speeding up construction progress checks and shortening infrastructure inspection duration, while maintaining survey grade accuracy. The intuitive, simple and automated solutions increase productivity by saving field and office time in civil engineering and inspection projects of roads, intersections, stockpile volumes, topography, piping, industrial facilities, bridges, property surveys, building facades, railways, cellular infrastructure …

Microfluidic Biopsy Trapping Device For The Real-Time Monitoring Of The Tumor Microenvironment, Angela Holton

USF Tampa Graduate Theses and Dissertations

The tumor microenvironment is composed of cellular and stromal components such as tumor cells, mesenchymal cells, immune cells, cancer associated fibroblasts and the supporting extracellular matrix. The tumor microenvironment provides crucial support for growth and progression of tumor cells and affects tumor response to therapeutic interventions. To better understand tumor biology and to develop effective cancer therapeutic agents it is important to develop preclinical platforms that can faithfully recapitulate the tumor microenvironment and the complex interaction between the tumor and its surrounding stromal elements. Drug studies performed in vitro with conventional two-dimensional cancer cell line models do not optimally represent …

Designing Biomaterials Using Mussel Adhesive Chemistry, Bruce P. Lee

TechTalks

Marine mussels secrete adhesive proteins that enable them to anchor to surfaces under water. We are exploiting chemistry utilized by mussels to design bioadhesives for tissue repair and wound healing, smart biomaterials for on-demand antipathogenic applications, and smart adhesives that can be turned on and off with externally applied stimuli.

Incorporating Student Reflection Into Engineering Courses, Nancy Barr

TechTalks

Critical reflection as students move through their disciplinary curriculum is one way to cultivate capacity for critical thinking. By embedding opportunities for critical reflection in disciplinary courses, educators can combine aspects of writing theory, metacognitive learning, and critical pedagogy to help students begin to frame how they will apply their skills and talents to problems effecting diverse populations. The new undergraduate ME curriculum combines applied learning and project-based learning methods in a series of four ME Practice courses. Technical communication instruction is also embedded in these courses, and the “capstone” of each course is a reflective essay. By responding to …

Space Mining Is Almost Here!, Paul Van Susant

TechTalks

When going to the Moon and Mars for extended stays with humans it is required to minimize mass by "living off the land" as soon as possible. Mining local resources and using them to produce consumables and construct simple structures can leverage launch mass to the surface of those bodies. In addition, asteroid mining will be able to provide rocket fuel to further spur economic development in CIS-Lunar space and further open up solar system activities. I am working on mining on Mars and the Moon as well as construction using local rocks.

New Concepts In Evolutionary Algorithms For Systems Architecture Optimization, Ossama Abdelkhalik

TechTalks

This talk will present recent developments in evolutionary algorithms that focus on the systems architecture optimization. One challenge in systems optimization is the variable number of design variables. Three new concepts will be presented in this talk that enable evolutionary algorithms to handle this type of problems more efficiently. The first is the biologically inspired concept of Hidden Genes that implements tags to cover/uncover genes in the variables' code, which enable handling variable number of variables in evolutionary algorithms. The second concept is a structured chromosome approach that transcripts the variables in a multi-layer code as opposed to the standard …

The Santa Clara, 2017-10-05, Santa Clara University

The Santa Clara

No abstract provided.

Cu2znsn(S1-Xsex)4 Solar Cell Fabrication And Characterization, Weiwei Sun

Theses and Dissertations

Cu2ZnSn(S1-xSex)4 (CZTSSe) is a kesterite material with similar properties to CuInxGa1-xS2 (CIGS) but less expensive element contained. A significant progress has been made in terms of CZTSSe in solar cell applications. Despite its energy conversion efficiency of 12.6% has been achieved by IBM using solution processes, further research and understanding of the materials is still needed in order to improve the solar cell performance of CZTSSe. In this study, we use a facile chemical route to fabricating CZTSSe thin-film solar cells by spin-coating followed by selenization process. An environmentally friendly non-toxic solution of highly soluble, inexpensive, and commercially available precursors …