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2023

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Articles 6331 - 6360 of 9778

Full-Text Articles in Engineering

Study On Pavement Performance Of Waterborne Epoxy Emulsified Asphalt And Its Application In Micro‐Surface, Jiang Hai, Liu Dachang Mar 2023

Study On Pavement Performance Of Waterborne Epoxy Emulsified Asphalt And Its Application In Micro‐Surface, Jiang Hai, Liu Dachang

Journal of China & Foreign Highway

In order to improve the pavement performance at micro-surface, waterborne epoxy resin was used to modify the emulsified asphalt, and the compatibility, microstructure, mechanical properties, rheological properties, and pavement performance of mixtures of the modified emulsified asphalt were studied. The storage stability test shows that the epoxy emulsion has good compatibility with emulsified asphalt. With the increase in waterborne epoxy resin content, the modified emulsified asphalt tends to form an epoxy resin-dominated skeleton structure. At the same time, with the increase in waterborne epoxy resin content, the adhesion and mechanical properties of emulsified asphalt and aggregate are significantly improved. At …

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Direct Van Der Waals Simulation (Dvs) Of Phase-Transforming Fluids, Tianyi Hu, Hao Wang, Hector Gomez Mar 2023

Direct Van Der Waals Simulation (Dvs) Of Phase-Transforming Fluids, Tianyi Hu, Hao Wang, Hector Gomez

Purdue University Libraries Open Access Publishing Fund

We present the method of direct van der Waals simulation (DVS) to study computationally flows with liquid-vapor phase transformations. Our approach is based on a discretization of the Navier-Stokes-Korteweg equations, which couple flow dynamics with van der Waals’ nonequilibrium thermodynamic theory of phase transformations, and opens an opportunity for first-principles simulation of a wide range of boiling and cavitating flows. The proposed algorithm enables unprecedented simulations of the Navier-Stokes-Korteweg equations involving cavitating flows at strongly under-critical conditions and ��(105) Reynolds number. The proposed technique provides a pathway for a fundamental understanding of phase-transforming flows with multiple applications in science, engineering, …

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Creating A Homophone-Based Chinese Language Censorship Evasion Tool, Emily Quan Mar 2023

Creating A Homophone-Based Chinese Language Censorship Evasion Tool, Emily Quan

Undergraduate Honors Theses

As the scope of Chinese language censorship expands, individuals will seek to bypass such censorship efforts. One of the most prevalent techniques in such censorship is automated keyword filtering. This research focuses on building a command-line tool that can bypass automated keyword filters for both traditional and simplified Chinese characters using a two-part approach. The first part involves detecting sensitive words in user-inputted text by using phrase matching techniques to identify character strings that have been censored in the past. The second part centers around generating possible obfuscated homonym alternatives. The tool relies on a compiled list of banned and …

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Protocol To Engineer Nanofilms Embedded Lipid Nanoparticles For Controlled And Targeted Drug Delivery (Nectar), Rashi Porwal, Stephen L. Hayward, Srivatsan Kidambi Mar 2023

Protocol To Engineer Nanofilms Embedded Lipid Nanoparticles For Controlled And Targeted Drug Delivery (Nectar), Rashi Porwal, Stephen L. Hayward, Srivatsan Kidambi

Department of Chemical and Biomolecular Engineering: Faculty Publications

We present a protocol to engineer a substrate-mediated delivery platform comprising hyaluronic acid-coated lipid nanoparticles (HALNPs) embedded into polyelectrolyte multilayer (PEM) films. This platform allows controlled spatiotemporal release of lipid nanoparticles (LNP) by embedding them within the polyelectrolyte multilayer films matrix. HALNP conjugate with antibodies also adds the ability for targeted delivery. The use of LNP enables this platform to encapsulate both hydrophobic and hydrophilic drugs. This platform can easily be reproduced and utilized for various biomedical drug delivery applications. For complete details on the use and execution of this protocol, please refer to Hayward et al. (2015, 2016a, 2016b), …

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Adaptive Modified Rise-Based Quadrotor Trajectory Tracking With Actuator Uncertainty Compensation, Emmanuel Ogbanje Ijoga, William Mackunis, Krishna Bhavithavya Kidambi, Madhur Tiwari Mar 2023

Adaptive Modified Rise-Based Quadrotor Trajectory Tracking With Actuator Uncertainty Compensation, Emmanuel Ogbanje Ijoga, William Mackunis, Krishna Bhavithavya Kidambi, Madhur Tiwari

Publications

This paper presents an adaptive robust nonlinear control method, which achieves reliable trajectory tracking control for a quadrotor unmanned aerial vehicle in the presence of gyroscopic effects, rotor dynamics, and external disturbances. Through novel mathematical manipulation in the error system development, the quadrotor dynamics are expressed in a control-oriented form, which explicitly incorporates the uncertainty in the gyroscopic term and control actuation term. An adaptive robust nonlinear control law is then designed to stabilize both the position and attitude loops of the quadrotor system. A rigorous Lyapunov-based analysis is utilized to prove asymptotic trajectory tracking, where the region of convergence …

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Human Spacesuit Interaction During Eva Of The Legs Using A Force Sensing System, Niraliben D. Patel Mar 2023

Human Spacesuit Interaction During Eva Of The Legs Using A Force Sensing System, Niraliben D. Patel

USF Tampa Graduate Theses and Dissertations

Astronauts perform a multitude of tasks in space, both in the spacecraft and outside of the spacecraft. Extravehicular Activity (EVA) refers to any activity that is completed outside of the spacecraft, whether it is work on the actual spacecraft, spacewalks, or conducting sample collections on other planets and moons. To do this safely, a pressurized Extravehicular Mobility Unit (EMU) or commonly known as the spacesuit is used. There have been multiple iterations of the United States EMU with advances to further optimize the astronaut safety and EVA tasks. However, there is still relatively little information on the movement of the …

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An Intelligent Decision Support Model For Optimal Selection Of Machine Tool Under Uncertainty: Recent Trends, Ibrahim M. Hezam Mar 2023

An Intelligent Decision Support Model For Optimal Selection Of Machine Tool Under Uncertainty: Recent Trends, Ibrahim M. Hezam

Neutrosophic Systems with Applications

Many scholars have been interested in the subject of machine tool selection as a result of the growing number of different machines and the continuous advancement of technology associated with these machines. The selection of an unsuitable machine tool may lead to a variety of issues, including limitations on production capacities and productivity indicators when taking into account both time and money from an industrial and practical perspective. The present strategy of selecting machine tools, known as multi-criteria decision-making (MCDM), relies on the subjective viewpoint the vast majority of the time. When selecting an appropriate machining tool, however, it is …

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Simulations Of Morphology Control Of Self-Assembled Amphiphilic Surfactants, Qinyu Zhu, Douglas R. Tree Mar 2023

Simulations Of Morphology Control Of Self-Assembled Amphiphilic Surfactants, Qinyu Zhu, Douglas R. Tree

Faculty Publications

One of the grand challenges of amphiphilic self-assembly is the design of ordered structures whose morphology or shape can be explicitly and dynamically controlled by adjusting the properties of the amphiphiles or their surroundings. Such a capacity would enable researchers to create synthetic systems with functionality that meets or exceeds biological cells, and provide a robust platform for a broad range of engineering applications such as artificial tissues, drug delivery, and separation membranes. Despite significant progress, important fundamental questions remain unanswered, due in part to the limited resolution and the restricted parameter spaces that are readily accessible in experiments. Computational …

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Compressive Sensing Via Variational Bayesian Inference Under Two Widely Used Priors: Modeling, Comparison And Discussion, Mohammad Shekaramiz, Todd K. Moon Mar 2023

Compressive Sensing Via Variational Bayesian Inference Under Two Widely Used Priors: Modeling, Comparison And Discussion, Mohammad Shekaramiz, Todd K. Moon

Electrical and Computer Engineering Faculty Publications

Compressive sensing is a sub-Nyquist sampling technique for efficient signal acquisition and reconstruction of sparse or compressible signals. In order to account for the sparsity of the underlying signal of interest, it is common to use sparsifying priors such as Bernoulli-Gaussian-inverse Gamma (BGiG) and Gaussian-inverse Gamma (GiG) priors on the compounds of the signal. With the introduction of variational Bayesian inference, the sparse Bayesian learning (SBL) methods for solving the inverse problem of compressive sensing have received significant interest as the SBL methods become more efficient in terms of execution time. In this paper, we consider the sparse signal recovery …

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Application Of Convergent Science And Technology Toward Ocular Disease Treatment, Ayca Bal-Ozturk, Ece Ozcan-Bulbul, Hazal Ezgi Gultekin, Berivan Cecen, Ebru Demir, Atefeh Zarepout, Sibel Cetinel, Ali Zarrabi Mar 2023

Application Of Convergent Science And Technology Toward Ocular Disease Treatment, Ayca Bal-Ozturk, Ece Ozcan-Bulbul, Hazal Ezgi Gultekin, Berivan Cecen, Ebru Demir, Atefeh Zarepout, Sibel Cetinel, Ali Zarrabi

Henry M. Rowan College of Engineering Departmental Research

Eyes are one of the main critical organs of the body that provide our brain with the most information about the surrounding environment. Disturbance in the activity of this informational organ, resulting from different ocular diseases, could affect the quality of life, so finding appropriate methods for treating ocular disease has attracted lots of attention. This is especially due to the ineffectiveness of the conventional therapeutic method to deliver drugs into the interior parts of the eye, and the also presence of barriers such as tear film, blood-ocular, and blood-retina barriers. Recently, some novel techniques, such as different types of …

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Eeg Classifier Validation Methods For Neuroprosthetic Hand Development, Keigo Yamauchi Mar 2023

Eeg Classifier Validation Methods For Neuroprosthetic Hand Development, Keigo Yamauchi

USF Tampa Graduate Theses and Dissertations

To date, many challenges have been reported in the development of neuroprosthetic hands using EEG and neural signals. In this study, we report the results of a literature review on Brain Computer Interface (BCI) technology, an investigation of estimation methods using applications in MATLAB, and the results of Electroencephalography (EEG) classification to assist in the development of neural prosthetic hands using biological signals such as EEG. Confusion Matrix was created using Motor Imagery (MI) data as the predictive value, and the average accuracy of more than 90% was obtained for the K-Nearest Neighbor (KNN) and decision tree method. The results …

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Restoration And Modification Of A Sputter Tool For The Deposition Of A Zno Guiding Layer Via Rf Sputtering, Matthew Watson Mar 2023

Restoration And Modification Of A Sputter Tool For The Deposition Of A Zno Guiding Layer Via Rf Sputtering, Matthew Watson

USF Tampa Graduate Theses and Dissertations

In this thesis, a novel sputter tool was restored and modified to deposit a ZnO film for future applications as a guiding layer on a surface acoustic wave (SAW) device. Some restorations and modifications included a water chiller being sized and added to the tool, leak checks to establish an ultra-high vacuum of 10-6 Torr, then finally heat lamps for temperature control were installed. Once modified, one of the preexisting magnetrons was utilized to deposit a ZnO via RF sputtering onto a quartz substrate. The layer was characterized via energy-dispersive X-ray spectroscopy which showed the existence of Zn on the …

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Concentrating E. Coli At Initial Low Concentrations By Centrifugation With Phosphate Buffered Saline, Plasma, And Simulated Blood Suspensions, Sarah Williams Mar 2023

Concentrating E. Coli At Initial Low Concentrations By Centrifugation With Phosphate Buffered Saline, Plasma, And Simulated Blood Suspensions, Sarah Williams

Undergraduate Honors Theses

The rapid diagnosis of blood stream infections (BSIs) is limited by the low concentration of bacteria in the blood. Currently, culturing of blood samples is used to increase the concentration of bacteria before the type of bacteria and the best antibiotic to treat the infection can be identified. However, the culturing of blood samples takes tens of hours, and therefore concentrating the bacteria from blood without growth will allow for quicker analysis and is crucial to saving lives. This thesis explored the means of concentrating E. coli suspensions in phosphate buffered saline (PBS), plasma, and simulated blood by centrifuging the …

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Statistical Analysis And Degradation Pathway Modeling Of Photovoltaic Minimodules With Varied Packaging Strategies, Sameera Nalin Venkat, Xuanji Yu, Jiqi Liu, Jakob Wegmueller, Jayvic Cristian Jimenez, Erika I. Barcelos, Hein Htet Aung, Roger H. French, Laura S. Bruckman Mar 2023

Statistical Analysis And Degradation Pathway Modeling Of Photovoltaic Minimodules With Varied Packaging Strategies, Sameera Nalin Venkat, Xuanji Yu, Jiqi Liu, Jakob Wegmueller, Jayvic Cristian Jimenez, Erika I. Barcelos, Hein Htet Aung, Roger H. French, Laura S. Bruckman

Faculty Scholarship

Degradation pathway models constructed using network structural equation modeling (netSEM) are used to study degradation modes and pathways active in photovoltaic (PV) system variants in exposure conditions of high humidity and temperature. This data-driven modeling technique enables the exploration of simultaneous pairwise and multiple regression relationships between variables in which several degradation modes are active in specific variants and exposure conditions. Durable and degrading variants are identified from the netSEM degradation mechanisms and pathways, along with potential ways to mitigate these pathways. A combination of domain knowledge and netSEM modeling shows that corrosion is the primary cause of the power …

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Computational Discovery Of Active And Selective Metal- Nitrogen-Graphene Catalysts For Electrooxidation Of Water To H2O2, Payal Chaudhary, Iman Evazzade, Rodion Belosludov,, Vitaly Alexandrov Mar 2023

Computational Discovery Of Active And Selective Metal- Nitrogen-Graphene Catalysts For Electrooxidation Of Water To H2O2, Payal Chaudhary, Iman Evazzade, Rodion Belosludov,, Vitaly Alexandrov

Department of Chemical and Biomolecular Engineering: Faculty Publications

A direct electrosynthesis of H2O2 from either O2 or H2O is an attractive strategy to replace the energy-intensive industrial anthraquinone process. Two-electron water oxidation reaction (2e-WOR) offers several advantages over the oxygen reduction reaction such as better mass transfer due to the absence of gasphase reactants. However, 2e-WOR is a more challenging and less studied process with only a handful of metal oxides exhibiting reasonable activity/selectivity properties. Herein, we employ density-functional-theory calculations to screen a variety of metal-nitrogen-graphene structures for 2e-WOR. As a consequence of scaling between the adsorption energies of reaction intermediates, we …

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Modeling Leachate Treatment Processes In Adsorbent-Amended Hybrid Constructed Wetland, Ishfaqun Nisa Mar 2023

Modeling Leachate Treatment Processes In Adsorbent-Amended Hybrid Constructed Wetland, Ishfaqun Nisa

USF Tampa Graduate Theses and Dissertations

Due to their efficiency in removing ammonia nitrogen, Constructed Wetlands (CW) are currently considered a very useful method for on-site leachate treatment. In recent years, the use of adsorbent media in CWs, such as zeolite and biochar, to improve pollutant removal efficiency has been explored and these studies indicate that incorporating zeolite can improve the nitrification process, while the addition of biochar can enhance the denitrification process and the removal of organic compounds. However, studies on mechanistic/process models simulating performance of adsorbent-amended CWs for treating landfill leachate are limited. This study presents simulation results for both unamended and adsorbent-amended hybrid …

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The Intersection Of Utility Coordination And Sue, Natalie Parks, Ken Kerr Mar 2023

The Intersection Of Utility Coordination And Sue, Natalie Parks, Ken Kerr

Purdue Road School

ASCE recently released two new SUE standards—ASCE 38-22 is the updated SUE standard commonly used during the utility coordination process during design, and ASCE 75-22 is the new utility as-built standard that is essential for the accurate location of newly relocated facilities in construction. This presentation will illustrate the interaction and relationship between SUE and utility coordination to enhance project deliverables and reduce risk during construction.

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Under Water: How To Green Up Your Roadway Project, Brian Tornes Mar 2023

Under Water: How To Green Up Your Roadway Project, Brian Tornes

Purdue Road School

Learn effective streambank stabilization techniques and funding resources that can be used to protect your roadways. Presenters will explain how to select the most effective stream bank restoration technique— natural channel design, traditional engineering, or both. Also learn how to maximize water quality and asset protection through stream bank stabilization using case studies that compare cost, form, and function. Lastly, we will review funding opportunities for the proposed green strategies.

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Alternative Delivery: Beyond Design-Build, Steve Davidson, William Stringer Mar 2023

Alternative Delivery: Beyond Design-Build, Steve Davidson, William Stringer

Purdue Road School

Owners are facing increased pressure to deliver major infrastructure projects in a timely and cost-efficient manner. Pain from inflation and labor/material short- ages are felt nationwide. To maximize limited budgets, owners are exploring alternative delivery methods. Attendees will learn about the benefits and pitfalls of progressive design-build (PDB) and construction manager/general contractor (CM/GC). Presenters will share best practices for determining if PDB and CM/GC are appropriate for your project and provide case study examples.

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Indiana Electric Vehicle Infrastructure Implementation Update, Diane Newton, Scott Manning, Kerri Garvin Mar 2023

Indiana Electric Vehicle Infrastructure Implementation Update, Diane Newton, Scott Manning, Kerri Garvin

Purdue Road School

2022 was a big year for EV infrastructure in Indiana. Starting with the approval of Indiana’s EV Implementation Plan in September 2022, INDOT and their team have been working fast and furiously to plan and deploy a network of DC Fast Charging Stations across the state. We will give an update on the plan implementation and next steps to inform stakeholders across the state on what they need to know for the next few years.

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Environmental Assessments On A Local Project, Robert Winebrinner, Trevor Wieseke, Summer R. Elmore, Alison Krupski, Mike Maurovich Mar 2023

Environmental Assessments On A Local Project, Robert Winebrinner, Trevor Wieseke, Summer R. Elmore, Alison Krupski, Mike Maurovich

Purdue Road School

This presentation will go through the environmental process of a recent $125M local project within Noblesville. What are the major differences between the National Environmental Policy Act (NEPA) and State Environmental Policy Act (SEPA) process as it relates to an environmental assessment (EA)? What is required, what is not required, and what is optional? How long does the process take? Join us as we walk through this exciting process and experience.

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Characteristics Of Unmanned Aircraft System (Uas) Sightings And Airport Safety, Cheng Wang Mar 2023

Characteristics Of Unmanned Aircraft System (Uas) Sightings And Airport Safety, Cheng Wang

Purdue Road School

The prevalence of Unmanned Aircraft Systems (UASs) has grown dramatically in recent years. With increasing UASs, an important consideration is UAS sightings around airports. A UAS sighting may result in an airport delay or shutdown, which disrupts airport operations and can lead to significant economic losses. This presentation discusses the characteristics of UAS sightings based on reports from the Federal Aviation Administration (FAA) and how these UAS sightings relate to airport operations.

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Design, Collaborate, Thrive: The Broad Ripple Avenue Project, Jessica Hawley, Emily Nelson, Ericka Miller Mar 2023

Design, Collaborate, Thrive: The Broad Ripple Avenue Project, Jessica Hawley, Emily Nelson, Ericka Miller

Purdue Road School

Broad Ripple Avenue (College Avenue to Winthrop Avenue) needed large-scale stormwater improvements. With the help of the Lochmueller Group and the Broad Ripple Village Association, Indianapolis DPW perceptively took this opportunity to also improve pedestrian facilities and regional multi-modal connectivity by combining multiple regional projects into one construction contract. This consolidation allowed for a cohesive public message through proactive public involvement. Presenters will share how consensus was built between invested parties through a successful public and private partnership.

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Decades In The Making: Reimagine Pleasant Street, Alison Krupski, Tanner Mckinney, Mike Maurovich Mar 2023

Decades In The Making: Reimagine Pleasant Street, Alison Krupski, Tanner Mckinney, Mike Maurovich

Purdue Road School

The Reimagine Pleasant Street project is a multi-year initiative that will result in improved east-west connectivity, accessibility, and safety for the City of Noblesville, while still honoring its urban character and historic features. Participants will learn how the project team addressed the challenges and complexities of completing this $125 million local project in the heart of the city. Construction for phase 1 began in the fall of 2022, and phases 2 and 3 will start in the fall of 2023.

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Airport Operational Sustainability Practices In Us Small Hub Airports, Caroline K. Marete Mar 2023

Airport Operational Sustainability Practices In Us Small Hub Airports, Caroline K. Marete

Purdue Road School

Operational sustainability focuses on everyday activities that facilitate seamless and efficient operations of an airport. While a holistic view of sustainability is necessary when planning for the long term, each of the four dimensions of sustainability can be assessed independently. This session will analyze data, including sustainable master plans, from US small hub airports to assess the effectiveness of operational sustainability initiatives. Participants will learn the benefits of incorporating sustainability in airport planning and promoting the adoption of sustainability planning in airports of all sizes.

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How To Prepare Meaningful Crash Analysis, Taylor Ruble Mar 2023

How To Prepare Meaningful Crash Analysis, Taylor Ruble

Purdue Road School

Many people outside of traffic engineering are required to conduct a crash history analysis as part of their scoping efforts for non-safety funded projects. Some engineers may not have much experience working with crash data or may not know how best to manipulate it to arrive at meaningful results. Using real-world examples, this presentation will walk through each step in requesting, filtering, diagramming, and interpreting crash data.

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I-70 Truck Automation Corridor Update, Diane Newton, Scott Manning, Anmol Sidhu Mar 2023

I-70 Truck Automation Corridor Update, Diane Newton, Scott Manning, Anmol Sidhu

Purdue Road School

Truck automation arrived in the Midwest in 2022 with the advertising of procurement for truck platooning and Level 2 and 4 automations on trucks in operations on I-70. We will discuss the readiness of infrastructure and industry to accept this technology, debunk the headlines on automation, discuss real-world feedback from both technology and trucking industries, and spotlight the partners who are helping INDOT and DriveOhio advance this project.

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So, You Want To Build A Hangar?, Carla M. Fischer Mar 2023

So, You Want To Build A Hangar?, Carla M. Fischer

Purdue Road School

Driven by corporate growth, companies are buying, maintaining, and piloting their own fleets of planes. Companies need a place to store and care for these multi-million-dollar assets, so the demand for corporate hangars is growing. But hangars aren’t like other commercial buildings; they have distinctive features from other structures. This presentation will address how clients need to work with aviation designers to educate themselves on the distinct characteristics of hangars and construction in an airport environment.

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Using Raised Crosswalks To Elevate Pedestrian Safety, Bradley Pease, William Hall Mar 2023

Using Raised Crosswalks To Elevate Pedestrian Safety, Bradley Pease, William Hall

Purdue Road School

Discussion of how and when Carmel implemented raised crosswalks for successful traffic calming and enhanced pedestrian safety.

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Evansville Airport Terminal And Passenger Access, Jamin Heldt, Nate Hahn Mar 2023

Evansville Airport Terminal And Passenger Access, Jamin Heldt, Nate Hahn

Purdue Road School

The Evansville Airport has completely updated the terminal area and passenger access to the terminal. A plan is underway to expand the passenger parking area in the future. This presentation will review the past updates and walk through future goals.

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