Engineering Commons^™

Material Characterization Of Intermetallic Compound Formation With Respect To Thermosonic Bonding Duration, Mahin Khan

Mechanical Engineering Master's Theses

Intermetallic Metallic Compounds (IMCs) formation is a common cause for wire bond failures. This research studied the effect of US vibration duration on IMC formation and growth in Copper-Aluminum (Cu-Al) wire bonded samples. Wire bonded samples, using 2.5 mil (63.5 μm) thick Palladium coated Copper wire, is ultrasonically bonded on a 2 cm thick Aluminum (1”x1”) coupon. Segmented bonding technique using 200 gf force and 220 gf force are applied during segment 1 and segment 2 of the bonding respectively. Ultrasonic (US) vibration frequency of 115-117 khz and a bonding temperature of 175°C is used. A pair of 5 samples …

Students Reaching For The Stars Become The Next Generation Of International Leaders, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Students reaching for the stars become the next generation of International Leaders" on September 22, 2017.

Students Reaching For The Stars Become The Next Generation Of International Leaders: Pucp 100 Year Anniversary - Part 1, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Students reaching for the stars become the next generation of International Leaders: PUCP 100 Year Anniversary" from September 22, 2017.

Students Reaching For The Stars Become The Next Generation Of International Leaders: Pucp 100 Year Anniversary - Part 2, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Students reaching for the stars become the next generation of International Leaders: PUCP 100 Year Anniversary" from Saptember 22, 2017.

Relationships Between Access To Mobile Devices, Student Self-Directed Learning, And Achievement, Scott R. Bartholomew, Ed Reeve, Raymond Veon, Wade Goodridge, Victor Lee, Louis Nadelson

Faculty Publications

Today’s students are growing up in a world of constant connectivity, instant information, and ever-changing technological advancements. The increasingly ubiquitous nature of mobile devices among K–12 students has led many to argue for and against the inclusion of these devices in K–12 classrooms. Arguments in favor cite instant access to information and collaboration with others as positive affordances that enable student self-directed learning. In this study, 706 middle school students from 18 technology and engineering education classes worked in groups of 2–3 to complete an openended engineering design challenge. Students completed design portfolios and constructed prototypes in response to the …

Measuring Rheological Properties Of Cement Pastes: Most Common Techniques, Procedures And Challenges, Dimitri Feys, Rolands Cepuritis, Stefan Jacobsen, Karel Lesage, Egor Secrieru, Ammar Yahia

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Science of Rheology is Increasingly Used to Describe the Properties of Fresh Cement Paste. Compared to Standard Workability Tests, Rheological Properties Allow for More Fundamental Investigation, More Precise Phenomenological Description of Flow Properties and Serve as Input for Numerical Simulations. Standard Commercially Available Rheometers Are Typically Used to Perform Those Measurements. However, the Results of the Measurement Depend on the Geometry, Testing Procedure and a Number of Potential Artefacts. This Technical Letter Describes the Most Common Techniques and Procedures Used to Assess the Rheological Properties of Cement Paste, as Well as Challenges during Measurements and Actions to Counter These …

Delivery Of Antioxidant And Anti-Inflammatory Agents For Tissue Engineered Vascular Grafts, Kenyatta S. Washington, Chris A. Bashur

Biomedical Engineering and Sciences Faculty Publications

The treatment of patients with severe coronary and peripheral artery disease represents a significant clinical need, especially for those patients that require a bypass graft and do not have viable veins for autologous grafting. Tissue engineering is being investigated to generate an alternative graft. While tissue engineering requires surgical intervention, the release of pharmacological agents is also an important part of many tissue engineering strategies. Delivery of these agents offers the potential to overcome the major concerns for graft patency and viability. These concerns are related to an extended inflammatory response and its impact on vascular cells such as endothelial …

Improvement Of Phylogenetic Method To Analyze Compositional Heterogeneity, Zehua Zhang, Kecheng Guo, Gaofeng Pan, Jijun Tang, Fei Guo

Faculty Publications

Background: Phylogenetic analysis is a key way to understand current research in the biological processes and detect theory in evolution of natural selection. The evolutionary relationship between species is generally reflected in the form of phylogenetic trees. Many methods for constructing phylogenetic trees, are based on the optimization criteria. We extract the biological data via modeling features, and then compare these characteristics to study the biological evolution between species.

Results: Here, we use maximum likelihood and Bayesian inference method to establish phylogenetic trees; multi-chain Markov chain Monte Carlo sampling method can be used to select optimal phylogenetic tree, resolving local …

Ambiance-Dependent Agglomeration And Surface-Enhanced Raman Spectroscopy Response Of Self-Assembled Silver Nanoparticles For Plasmonic Photovoltaic Devices, Jephias Gwamuri, Ragavendran Venkatesan, Mehdi Sadatgol, Jeyanthinath Mayandi, Durdo O. Guney, Joshua M. Pearce

Department of Materials Science and Engineering Publications

The agglomeration/dewetting process of thin silver films provides a scalable method of obtaining self-assembled nanoparticles (SANPs) for plasmonics-based thin-film solar photovoltaic (PV) devices. We show the effect of annealing ambiance on silver SANP average size, particle/cluster finite shape, substrate area coverage/particle distribution, and how these physical parameters influence optical properties and surface-enhanced Raman scattering (SERS) responses of SANPs. Statistical analysis performed indicates that generally Ag SANPs processed in the presence of a gas (argon and nitrogen) ambiance tend to have smaller average size particles compared to those processed under vacuum. Optical properties are observed to be highly dependent on particle …

Development And Large Scale Manufacturing Of Exosome-Based Therapeutics, Konstantin Konstantinov

Integrated Continuous Biomanufacturing III

No abstract provided.

2017, October - Recommendations To Address The Expansion Of Seawater Intrusion In The Salinas Valley Groundwater Basin

Monterey County Water Resources Agency Water Reports

This report provides a discussion of the current knowledge and related background information surrounding seawater intrusion pathways and potential impacts thereof on the Salinas Valley Groundwater Basin. The report also serves as a body of evidence to catalogue the findings used to support the six recommendations presented. Each recommendation can be implemented on its own or in concert with the others, and the relative importance of each is discussed individually in this report. However, the recommendations are conceptualized as a comprehensive solution that, along with continued operation of projects that have been constructed for the same purpose, have the strongest …

Delivering A Toolbox Of Flexible Platforms For Clinical And Commercial Bioprocessing Production: ‘Defining The Business Drivers For Development And Implementation’, Mark Brower, David Pollard

Integrated Continuous Biomanufacturing III

Despite the growing success, the biopharmaceutical industry continues to face competitive challenges from multiple sources. The cost pressures include evolving reimbursement, global competition and loss of drug exclusivity. As a result, there is a significant drive to boost the overall productivity of bio therapeutic programs by shortening development timelines and lowering both development and production costs, while maintaining product quality. Low cost production solutions must be aggressively pursued due to the large number of drug candidates in development, and their relatively high dosing requirements. The industry is facing an expanding range of modalities such as bispecifics and nanobodies, that provide …

Swedish Transportation Officials Visit Usu’S Electric Vehicle And Roadway Research Facility | College Of Engineering, Usu College Of Engineering

College of Engineering News

Authorities from the Swedish Transport Administration were in Logan on Sept. 18 to see the latest electrified vehicle and roadway research underway at Utah State University.

Self-Propulsion Of Leidenfrost Drops Between Non-Parallel Structures, Cheng Luo, Manjarik Mrinal, Xiang Wang

Mechanical and Aerospace Faculty Publications - Archive

In this work, we explored self-propulsion of a Leidenfrost drop between non-parallel structures. A theoretical model was first developed to determine conditions for liquid drops to start moving away from the corner of two non-parallel plates. These conditions were then simplified for the case of a Leidenfrost drop. Furthermore, ejection speeds and travel distances of Leidenfrost drops were derived using a scaling law. Subsequently, the theoretical models were validated by experiments. Finally, three new devices have been developed to manipulate Leidenfrost drops in different ways.

Usu Opens State-Of-The-Art Idea Factory For Aggie Engineers | College Of Engineering, Usu College Of Engineering

College of Engineering News

The College of Engineering at Utah State University is debuting its brand new Idea Factory, a state-of-the-art design and fabrication facility on the Logan campus.

Assessing Situation Awareness In Unmanned Aircraft Systems Operations, Haydee M. Cuevas, Marisa Aguiar

International Journal of Aviation, Aeronautics, and Aerospace

The objective of this study was to investigate the potential utility of the Situation Awareness Linked Indicators Adapted to Novel Tasks (SALIANT) methodology as an assessment tool in unmanned aircraft systems (UAS) operations. Eighteen participants completed a UAS scenario (port security) as part of nine two-person crews (pilot and sensor operator). Subject matter experts mapped the naturally occurring team behaviors in the UAS scenario to create a SALIANT checklist, which was then used to rate participants’ SA. Results showed the SALIANT methodology was able to discriminate differences in SA behaviors among the UAS crews. Results also revealed significant correlations between …

Detecting And Assessing Collision Potential Of Aircraft And Small Unmanned Aircraft Systems (Suas) By Visual Observers, Samuel M. Vance, Ryan J. Wallace, Jon M. Loffi, Jamey D. Jacob, Jared C. Dunlap, Taylor A. Mitchell

International Journal of Aviation, Aeronautics, and Aerospace

Visual observers are used to assist the Remote Pilot with maintaining sight of the unmanned aircraft as well as scanning the surrounding airspace for potential collision hazards. The purpose of this study was to examine the effectiveness of visual observers in detecting an intruding general aviation aircraft approaching the small unmanned aircraft system (sUAS) operations area. The study sought to determine the effectiveness of sUAS visual observers in detecting a general aviation aircraft collision hazard with a sUAS. Ten participants were asked to perform visual observer duties in support of a sUAS operation. Participants were asked to indicate when they …

Oxidation Of Uc: An In-Situ High Temperature Environmental Scanning Electron Microscopy Study, Claudia Gasparrini, Michael J.D. Rushton, William E. Lee, Renaud Podor, Denis Horlait, Olivier Fiquet

Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications IV

Uranium carbide (UC) has the potential to be used as fuel in Generation IV nuclear reactors thanks to its higher metal atom density and better thermal conductivity when compared to the most commonly used fuel: uranium dioxide (UO₂) [1]. Although UC offers improved properties during operation, it needs to be converted into an oxide form after usage as it is reactive and potentially pyrophoric [2] in oxidising environments. Previous oxidation studies on UC, performed over a range of oxygen atmospheres and temperatures, suggest different mechanisms lead to the formation of either a protective or a pulverised non-protective oxide …

Potency And Cytotoxicity Of A Novel Gallium-Containing Mesoporous Bioactive Glass/Chitosan Composite Scaffold As Hemostatic Agents, Sara Pourshahrestani, Ehsan Zeimaran, Nahrizul Adib Kadri, Nicola Gargiulo, Hassan Mahmood Jindal, Sangeetha Vasudevaraj Naveen, Shamala Devi Sekaran, Tunku Kamarul, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

Chitosan-based hemostats are promising candidates for immediate hemorrhage control. However, they have some disadvantages and require further improvement to achieve the desired hemostatic efficiency. Here, a series of 1% Ga2O3-containing mesoporous bioactive glass-chitosan composite scaffolds (Ga-MBG/CHT) were constructed by the lyophilization process and the effect of various concentrations of Ga-MBG (10, 30, and 50 wt %) on the hemostatic function of the CHT scaffold was assessed as compared to that of Celox Rapid gauze (CXR), a current commercially available chitosan-coated hemostatic gauze. The prepared scaffolds exhibited >79% porosity and showed increased water uptake compared to that in CXR. The results …

Electrochemical Reduction Of Co2 Using Metal Nanoparticles, Evan Michael Andrews

LSU Doctoral Dissertations

The electrochemical reduction of CO₂ has been proposed as a method of storing electrical energy from renewable sources in the form of hydrocarbon fuels. By reverting CO₂ into high energy density fuels, a CO₂-neutral fuel cycle becomes possible while still hydrocarbon fueled engines. Cu and Au metals have been found to be particularly effective at catalyzing this reaction, yielding a majority of hydrocarbons and CO respectively. However, the CO₂ electroreduction reaction is still poorly understood and catalysts that possess both high energy efficiency and high yield are not yet developed. Nanoscale catalysts offer the ability …

Examining Accident Reports Involving Autonomous Vehicles In California, Francesca Favaro, Nazanin Nader, Sky Eurich, Michelle Tripp, Naresh Varadaraju

Faculty Publications

Autonomous Vehicle technology is quickly expanding its market and has found in Silicon Valley, California, a strong foothold for preliminary testing on public roads. In an effort to promote safety and transparency to consumers, the California Department of Motor Vehicles has mandated that reports of accidents involving autonomous vehicles be drafted and made available to the public. The present work shows an in-depth analysis of the accident reports filed by different manufacturers that are testing autonomous vehicles in California (testing data from September 2014 to March 2017). The data provides important information on autonomous vehicles accidents’ dynamics, related to the …

Qualitative Analysis Of Loss Of Control Aircraft Accidents Using Text Mining Techniques, Carolina Anderson, Maryjo O. Smith

International Journal of Aviation, Aeronautics, and Aerospace

The purpose of this study was to analyze the narrative National Transportation Safety Board (NTSB) accident cause descriptions for general aviation (GA) Loss of Control (LOC) accident reports by the different certification categories: Federal Aviation Regulations Part 23 (Part 23), Civil Air Regulations 3 (CAR 3), Light Sport Aircraft (LSA), and Experimental-Amateur Built (E-AB). Airworthiness certification categories represent a wide diversity of government oversight. Part 23 rules have evolved from the initial set of simpler design standards and have progressed into a comprehensive and strict set of rules to address the safety issues of the more complex airplanes within the …

Introduction To H2020 Project C3harme: Next Generation Ceramic Composites For Combustion Harsh Environments And Space, Diletta Sciti, Laura Silvestroni, Luca Zoli, Antonio Vinci, Frederic Monteverde

Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications IV

Materials for aeronautical and space applications largely involve ceramic matrix composites, CMCs, made of carbon or silicon carbide. However, C/C composites suffer from poor erosion resistance while silicon-based ceramics, SiC/SiC or C/SiC composites, may undergo strong ablation due to the formation and volatilization of silica. In recent years, Ultra-High Temperature Ceramics, UHTCs, have shown outstanding erosion resistance at temperatures up to 2000°C or even higher but they still cannot resist to thermal shocks and damage. Therefore, there is an increasing demand for advanced materials with temperature capability in highly corrosive environments to enable space vehicles to resist several launches and …

Continuous Manufacturing - Ema Perspective And Experience, Nino Mihokovic

Integrated Continuous Biomanufacturing III

Continuous manufacturing provides a distinct set of advantages and challenges from technical and regulatory viewpoints. Challenges such as batch definition and traceability, dynamic control strategies, use of Process Analytical Technologies, validation strategies and specifications are some of the areas which can require new perspectives from both industry and regulators. This presentation will reflect on the current regulatory environment and principles applied to continuous manufacturing; it aims to share the European experience with marketing authorisation applications using aspects of continuous manufacturing; and outlines Agency support to innovation and opportunities to consult and interact with the regulatory authorities during various stages of …

Continuous Freeze-Drying And Its Relevance To The Pharma/Biotech Industry, Roberto Pisano, Luigi C. Capozzi, Bernhardt Trout

Integrated Continuous Biomanufacturing III

The new paradigm of pharmaceutical industry is to move from batch to continuous processes in order to satisfy the stringent requirements of quality, safety and efficiency set by regulatory authorities and reduce production costs. In this perspective, freeze-drying needs to be completely rethought in order to be more integrated in the chain of production of drugs, more flexible to respond to variations in market needs and allowing the monitoring of product quality. The future of freeze-drying, as a downstream process, is therefore to move from batch to continuous. Over the past decades many ideas regarding continuous freeze-drying has been proposed, …

Relative Target Estimation Using A Cascade Of Extended Kalman Filters, Jerel Nielsen, Randal Beard

Student Works

This paper presents a method of tracking multiple ground targets from an unmanned aerial vehicle (UAV) in a 3D reference frame. The tracking method uses a monocular camera and makes no assumptions on the shape of the terrain or the target motion. The UAV runs two cascaded estimators. The first is an Extended Kalman Filter (EKF), which is responsible for tracking the UAV’s state, such as position and velocity relative to a fixed frame. The second estimator is an EKF that is responsible for estimating a fixed number of landmarks within the camera’s field of view. Landmarks are parameterized by …

Feasibility Analysis Of Electric Roadways, Regan Zane

Funded Research Records

No abstract provided.

Rarefication Effects On Jet Impingement Loads, Shiying Cai, Chunpei Cai, Kai Zhang, Jun Li

Michigan Tech Publications, Part 1

Rarefication effects on jet impingement loads are studied by comparing recent new formulas at the collisionless flow limit and numerical simulations. The jet exit size is finite, and can be either planar or round. In the simulations, the jets have different degrees of rarefication, with a Knudsen (Kn) number ranging from 0 to infinity; i.e., the jet flows can be continuum, collisional, or collisionless. The comparison results indicate that (1) the new surface load formulas are accurate at the collisionless flow limit; (2) in general, the formulas offer upper limits for the peak loads; (3) however, it is improper to …

Patentability Of Living Matter Related To Biofuel Production In The U.S., Nathan K. Shrewsbury

Oklahoma Journal of Law and Technology

No abstract provided.

Can Schools Use Nanotechnology To Prevent Cell Phones From Ringing, Sarah C. Boyer

Oklahoma Journal of Law and Technology

No abstract provided.