Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

156,682 Full-Text Articles 183,743 Authors 56,080,941 Downloads 321 Institutions

All Articles in Engineering

Faceted Search

156,682 full-text articles. Page 6 of 4627.

Hemodynamic Effects On Aortic Development Due To Outflow Tract Banding, Humza Ismail 2020 Washington University in St. Louis

Hemodynamic Effects On Aortic Development Due To Outflow Tract Banding, Humza Ismail

Engineering and Applied Science Theses & Dissertations

Hemodynamic forces drive remodeling of the early cardiac system in embryonic development. Perturbations of normal cardiac blood flow can cause the formation of defects and malformations within the cardiac system. Specifically, changes in hemodynamics can cause the formation of different congenital heart defects. The formation of heart defects has been studied; however, vasculature specific defects caused by changes in blood flow patterns in the early cardiac system have not been studied to the same degree. In this thesis, the effects of hemodynamic changes on arterial development were studied. Outflow tract banding (OTB) was used to cause a local increase in ...


Download Bmp Trains 2020 Newest Version, Martin Wanielista 2020 University of Central Florida

Download Bmp Trains 2020 Newest Version, Martin Wanielista

BMP Trains

This is version 4.0.0 BMP Trains 2020. It is a computer program used to assess the average annual removal effectiveness of nutrients. It is based on research from the State of Florida and uses design criteria in the State. It is accepted by regulatory agencies in the State. It was posted May 1, 2020. Minor wording changes were made to the release dated April 15, 2020.

This version allows for greater flexibility in media selection. It also increases the reporting decimal places for TP removed in the Summary and Complete Reports A well as changes from fraction to ...


User Manual - Bmp Trains 2020 Newest Version, Martin Wanielista 2020 University of Central Florida

User Manual - Bmp Trains 2020 Newest Version, Martin Wanielista

BMP Trains

This update is for version 4.0.0 completed on May 1, 2020 for May 2020 release. This is a user manual to accompany the computer program called BMP Trains 2020. The user manual provides example problems useful to understanding the program. The user manual is updated when there is a need to respond to user comments or to incorporate new research. The BMP Trains 2020 program is used to assess the average annual effectiveness of nutrient removal from combinations of stormwater BMPs. Fifteen (15) example problems are used to illustrate design options for BMPs in the State of Florida.


Pilot’S Willingness To Operate In Unmanned Aircraft System Integrated Airspace, Lakshmi Vempati 2020 Embry-Riddle Aeronautical University

Pilot’S Willingness To Operate In Unmanned Aircraft System Integrated Airspace, Lakshmi Vempati

Dissertations and Theses

The interest in Unmanned Aircraft Systems (UAS) use for private, civil, and commercial purposes such as package delivery, inspection, surveillance, and passenger and cargo transport has gained considerable momentum. As UAS infiltrate the National Airspace System (NAS), there is a need to not only develop viable, safe, and secure solutions for the co-existence of manned and unmanned aircraft, but also determine public acceptance and pilot’s willingness to operate an aircraft in such an integrated environment. Currently there is little or no research on pilot’s perceptions on their willingness to operate an aircraft in UAS integrated airspace and airports ...


Active Drag Reduction Of Ground Vehicles Using Air-Jet Wheel Deflectors, Kaloki Nabutola 2020 Embry-Riddle Aeronautical University

Active Drag Reduction Of Ground Vehicles Using Air-Jet Wheel Deflectors, Kaloki Nabutola

Dissertations and Theses

Seven turbulence models were used to simulate the flow within the wheelhouse of a simplified vehicle body. The performance of each model was evaluated by comparing the aerodynamic coefficients obtained using computational fluid dynamics (CFD) to data collected from wind tunnel experiments. The performance of large eddy simulation (LES) and detached eddy simulation (DES) was largely dependent on the time step and grid size to accurately resolve turbulent eddies. The standard k-e, realizable k-e, k-w, DES, and LES all trended towards a drag coefficient which was 20% lower than the experimental value. In all numerical cases, the lift coefficient was ...


Analysis Of Local Convection Heat Transfer Rates Of Supercritical Carbon Dioxide In Tubes, Yang Chao 2020 Embry-Riddle Aeronautical University

Analysis Of Local Convection Heat Transfer Rates Of Supercritical Carbon Dioxide In Tubes, Yang Chao

Dissertations and Theses

Numerical investigation on thermodynamic characteristics of pure supercritical carbon dioxide (𝑆𝐶𝑂2) and mixtures of Helium and 𝑆𝐶𝑂2 in horizontal straight tubes with diameter of 6mm under cooling and heating conditions is carried out by using SST 𝑘 − 𝜔 turbulence model. The computations are conducted at operating pressure of 8MPa with various operating conditions. Simulations are conducted by using the latest poly-hexcore mesh method in ANSYS FLUENT 19.2 and tetrahedral mesh method in CFX 19.2, results and solving time are compared. The effect of heat flux, mass flux, inlet temperature and buoyancy on heat transfer performance are studied, pressure ...


Deep Learning And Polar Transformation To Achieve A Novel Adaptive Automatic Modulation Classification Framework, Pejman Ghasemzadeh 2020 University of Nebraska - Lincoln

Deep Learning And Polar Transformation To Achieve A Novel Adaptive Automatic Modulation Classification Framework, Pejman Ghasemzadeh

Theses, Dissertations, and Student Research from Electrical & Computer Engineering

Automatic modulation classification (AMC) is an approach that can be leveraged to identify an observed signal's most likely employed modulation scheme without any a priori knowledge of the intercepted signal. Of the three primary approaches proposed in literature, which are likelihood-based, distribution test-based, and feature-based (FB), the latter is considered to be the most promising approach for real-world implementations due to its favorable computational complexity and classification accuracy. FB AMC is comprised of two stages: feature extraction and labeling. In this thesis, we enhance the FB approach in both stages. In the feature extraction stage, we propose a new ...


In-Service Performance Evaluation Of Concrete Sloped End Treatments In Iowa, Jessica Lingenfelter 2020 University of Nebraska - Lincoln

In-Service Performance Evaluation Of Concrete Sloped End Treatments In Iowa, Jessica Lingenfelter

Mechanical (and Materials) Engineering -- Dissertations, Theses, and Student Research

Sloped end treatments were historically developed as low-cost, low-maintenance end treatments for rigid features like concrete barriers and bridge rails. Crash testing indicated that sloped end treatments are associated with significant instability for impacting vehicles. However, the in-service performance of these features has not been evaluated. An in-service performance evaluation (ISPE) was performed to evaluate vehicle crashes with sloped end treatments in Iowa between 2008 and 2017. Researchers generated a geographic inventory of sloped end treatment locations, reviewed crash narratives and scene diagrams for crashes near these sloped end treatments, and calculated an estimated crash rate and crash cost for ...


Vehicle Design Study Of A Straight Flying-Wing With Bell-Shaped Spanload, Kevin Hainline 2020 Washington University in St. Louis

Vehicle Design Study Of A Straight Flying-Wing With Bell-Shaped Spanload, Kevin Hainline

Engineering and Applied Science Theses & Dissertations

Straight flying-wing configurations, that is flying wings with zero quarter-chord sweep, are key to understanding bird flight, have potential performance improvements, and are suitable for "survivable" applications. Straight flying-wings are also well suited for morphing geometry, e.g. with variable twist, since changes in lift distribution do not impact longitudinal equilibrium. The straight-flying wing can adjust its lift distribution to optimize aerodynamic efficiency across a wide range of flight conditions. In this thesis, we conduct the design study of a flying-wing with bell-shaped spanload; the study vehicle is called "Biom T1". Biom T1 has a more efficient directional control scheme ...


Utilization Of Recycled Filament For 3d Printing For Consumer Goods, Alexa Peterson 2020 University of Arkansas, Fayetteville

Utilization Of Recycled Filament For 3d Printing For Consumer Goods, Alexa Peterson

Apparel Merchandising and Product Development Undergraduate Honors Theses

The 3D printing market has been used in a wide variety of manufacturing industries including textile and apparel. Many consumers can now own a personal 3D printer at home for recreational printing. There are even websites dedicated to 3D printing patterns made by consumers. However, the materials used in the 3D printing process pose a problem for the environment due to their plastic-based nature. 3D printing is a layered process with each layer being printed depending on the layer below it for strength and stability. During the 3D printing process, great amounts of waste are produced as a result of ...


Pollution Prevention And Water Reuse At Utah Department Of Transportation Facilities, Amanda Stoudt 2020 Utah State University

Pollution Prevention And Water Reuse At Utah Department Of Transportation Facilities, Amanda Stoudt

All Graduate Theses and Dissertations

As stormwater flows over roads, sidewalks, and other impervious surfaces, it picks up pollutants that are deposited on these surfaces. One common pollutant transported by stormwater is road salt. While the application of road salt is crucial for wintertime public safety, road salt has a host of negative environmental impacts. Road salt has been linked to increasing levels of dissolved solids in groundwater, vegetation damage, and behavioral changes in aquatic organisms. Studies have shown that these impacts are concentrated around salt storage facilities. As a result, the United States Environmental Protection Agency issued many state departments of transportation municipal separate ...


Strategic Infrastructure Planning For Autonomous Vehicles, Zhaocai Liu 2020 Utah State University

Strategic Infrastructure Planning For Autonomous Vehicles, Zhaocai Liu

All Graduate Theses and Dissertations

Compared with conventional human-driven vehicles (HVs), AVs have various potential benefits, such as increasing road capacity and lowering vehicular fuel consumption and emissions. Road infrastructure management, adaptation, and upgrade plays a key role in promoting the adoption and benefit realization of AVs.This dissertation investigated several strategic infrastructure planning problems for AVs. First, it studied the potential impact of AVs on the congestion patterns of transportation networks. Second, it investigated the strategic planning problem for a new form of managed lanes for autonomous vehicles, designated as autonomous-vehicle/toll lanes, which are freely accessible to autonomous vehicles while allowing human-driven vehicles ...


Toward Controlling Cardiac Tissue Pacing Using Modified Mrna, Yicheng Zhao 2020 Washington University in St. Louis

Toward Controlling Cardiac Tissue Pacing Using Modified Mrna, Yicheng Zhao

Engineering and Applied Science Theses & Dissertations

Arrhythmia is a common heart disease that happens when the heart is beating too fast, too slow, or irregularly. To study the mechanisms and treatments of this disease, it is important to acutely control the beating rate of the model as it will help distinguish the contribution of different potassium currents and drug-induced action potential in cardiomyocytes. The current method of tissue pacing, electrical pacing, causes contamination and corrosive damage to tissues, thus the tissues fail to be used repeatedly or in future studies. In this study, red-shifted channelrhodopsin (ReaChR) is applied as a non-chemical means to control the beating ...


Predicting Disease Progression Using Deep Recurrent Neural Networks And Longitudinal Electronic Health Record Data, Seunghwan Kim 2020 Washington University in St. Louis

Predicting Disease Progression Using Deep Recurrent Neural Networks And Longitudinal Electronic Health Record Data, Seunghwan Kim

Engineering and Applied Science Theses & Dissertations

Electronic Health Records (EHR) are widely adopted and used throughout healthcare systems and are able to collect and store longitudinal information data that can be used to describe patient phenotypes. From the underlying data structures used in the EHR, discrete data can be extracted and analyzed to improve patient care and outcomes via tasks such as risk stratification and prospective disease management. Temporality in EHR is innately present given the nature of these data, however, and traditional classification models are limited in this context by the cross- sectional nature of training and prediction processes. Finding temporal patterns in EHR is ...


Cfd Modeling Of Vertical Axis Wind Turbine Arrays Using Actuator Cylinder Theory, Cory Schovanec 2020 Washington University in St. Louis

Cfd Modeling Of Vertical Axis Wind Turbine Arrays Using Actuator Cylinder Theory, Cory Schovanec

Engineering and Applied Science Theses & Dissertations

The goal of this thesis is to analyze the flow field and power generation from a vertical axis wind turbine (VAWT) by extending the Actuator Cylinder Model to include the viscous effects. Turbulent flow effects in the Actuator Cylinder Model are modeled by solving the Reynolds-Averaged Navier-Stokes (RANS) equations with the Spalart-Allmaras (SA) turbulence model in ANSYS FLUENT. A study is performed to establish mesh independence of the solutions. Numerical solutions on a fine mesh are compared to existing theoretical results based on inviscid theory for a series of flow conditions and turbine sizes. Similar trends in the present turbulent ...


Dmd And Pod Modal Analysis For Store Separation, Nicholas Peters 2020 Embry-Riddle Aeronautical University

Dmd And Pod Modal Analysis For Store Separation, Nicholas Peters

Dissertations and Theses

Store separation from aircraft and spacecraft has historically been a critical and in some cases fatal issue for the aerospace industry. Given the severity of the issue much effort has been spent on the development of processes to identify failure flight conditions for store separation. The processes currently used for identifying potential failure conditions however are both resource intensive and iterative processes. A potential remedy to reducing resource use and improve turn around time in this process is the implementation of a mode based reduced order model (ROM) for modeling store separation. The objective of this study was to first ...


Development And Test Of High Temperature Surface Acoustic Wave Gas Sensors, Armando E. Ayes Moncada 2020 University of Maine

Development And Test Of High Temperature Surface Acoustic Wave Gas Sensors, Armando E. Ayes Moncada

Electronic Theses and Dissertations

The demand for sensors in hostile environments, such as power plant environments, exhaust systems and high-temperature metallurgy environments, has risen over the past decades in a continuous attempt to increase process control, improve energy and process efficiency in production, reduce operational and maintenance costs, increase safety, and perform condition-based maintenance in equipment and structures operating in high-temperature, harsh-environment conditions. The increased reliability, improved performance, and development of new sensors and networks with a multitude of components, especially wireless networks, are the target for operation in harsh environments. Gas sensors, in particular hydrogen gas sensors, operating above 200°C are required ...


A Performance Analysis Of Hardware-Assisted Security Technologies, Wenjie Qiu 2020 Washington University in St. Louis

A Performance Analysis Of Hardware-Assisted Security Technologies, Wenjie Qiu

Engineering and Applied Science Theses & Dissertations

Intel Software Guard Extensions (SGX) is a novel hardware-assisted security technology introduced by Intel Corporation. The ambition of Intel SGX is to provide an isolated and secure execution environment for user-space applications. Even if the BIOS is compromised, the protected applications remains secure. The isolated execution environment is located in a special memory region called the enclave.

Promoting and using a novel technology requires a good understanding of it. This thesis first contains a systematization of knowledge of the hardware-assisted security technologies, trusted computing and the Intel SGX. What is more, to have the best practice of using Intel SGX ...


Embedding Preference Elicitation Within The Search For Dcop Solutions, Yuanming Xiao 2020 Washington University in St. Louis

Embedding Preference Elicitation Within The Search For Dcop Solutions, Yuanming Xiao

Engineering and Applied Science Theses & Dissertations

The Distributed Constraint Optimization Problem(DCOP)formulation is a powerful tool to model cooperative multi-agent problems, especially when they are sparsely constrained with one another. A key assumption in this model is that all constraints are fully specified or known a priori, which may not hold in applications where constraints encode preferences of human users. In this thesis, we extend the model to Incomplete DCOPs (I-DCOPs), where some constraints can be partially specified. User preferences for these partially-specified constraints can be elicited during the execution of I-DCOP algorithms, but they incur some elicitation costs. Additionally, we propose two parameterized heuristics ...


Robust Control Of Burst Suppression Amid Physical And Neurological Uncertainty, Stephen Ampleman, ShiNung Ching 2020 Washington University in St. Louis

Robust Control Of Burst Suppression Amid Physical And Neurological Uncertainty, Stephen Ampleman, Shinung Ching

Engineering and Applied Science Theses & Dissertations

Burst suppression is a clinical term describing a phenomenon in which the electroencephalogram (EEG) of a sedated patient produces behavior that switches between higher frequency and amplitude bursting to lower frequency and lower amplitude suppression. This phenomenon can be observed during general anesthesia, hypothermia, or in an otherwise induced coma state. In a clinical setting, this phenomenon is typically induced by sedation from a drug such as propofol (2,6-diisopropylphenol). The level of sedation can be quantified by something called the burst suppression ratio (BSR), which is defined as the amount of time that a patient’s EEG is in ...


Digital Commons powered by bepress