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

Engineering Commons

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

144,426 Full-Text Articles 165,991 Authors 56,080,941 Downloads 298 Institutions

All Articles in Engineering

Faceted Search

144,426 full-text articles. Page 3 of 4136.

Computations Of Top-Down Attention By Modulating V1 Dynamics, David Berga, Xavier Otazu 2019 Computer Vision Center, Autonomous University of Barcelona

Computations Of Top-Down Attention By Modulating V1 Dynamics, David Berga, Xavier Otazu

MODVIS Workshop

The human visual system processes information defining what is visually conspicuous (saliency) to our perception, guiding eye movements towards certain objects depending on scene context and its feature characteristics. However, attention has been known to be biased by top-down influences (relevance), which define voluntary eye movements driven by goal-directed behavior and memory. We propose a unified model of the visual cortex able to predict, among other effects, top-down visual attention and saccadic eye movements. First, we simulate activations of early mechanisms of the visual system (RGC/LGN), by processing distinct image chromatic opponencies with Gabor-like filters. Second, we use a ...


Deformable Image Registration For Hyperspectral Images, Rui Liao 2019 Washington University in St. Louis

Deformable Image Registration For Hyperspectral Images, Rui Liao

Engineering and Applied Science Theses & Dissertations

Image registration is one of the basic image processing operations in remote sensing. A hyperspectral image has two spatial dimensions and one spectral dimension. There are many hyperspectral sensors used in remote sensing. Traditional intensity-based registration methods may fail for hyperspectral images because of the different spectral sensitivities for different sensors. In addition, not all spectral bands are required to achieve accurate registration. This thesis develops a modification of the large deformation diffeomorphic metric mappings (LDDMM) algorithm in order to deal with the challenges when applied to hyperspectral images. The transformation generated by our method that deforms one image to ...


Fabrication Of Enhanced Carbon Based Biocompatible And Biodegradable Microelectronic Materials Derived From Lignocellulosic Biomass, Harrison Thomas Hawkins 2019 Rowan University

Fabrication Of Enhanced Carbon Based Biocompatible And Biodegradable Microelectronic Materials Derived From Lignocellulosic Biomass, Harrison Thomas Hawkins

Theses and Dissertations

The development of materials capable of harmlessly being broken down and removed from the body is a crucial step towards the development of short-term application electronic biomedical implants. Once developed, these implants, known as bioresorbable electronics, will open a wide array of temporary applications in the field of biomedical implantable devices. Necessary to the operation of bioresorbable electronics within the body is a power source that is similarly biocompatible and biodegradable. To this end, enhanced carbon-based materials and a bio-ionic liquid were developed for the fabrication of a preliminary implantable and bioresorbable battery and tested for functional properties. Electrodes were ...


Age Dependent Regulation Of Cardiac Sodium Channel Gain Of Function, Madison Nowak, David Ryan King, Steven Poelzing, Seth Weinberg 2019 Virginia Commonwealth University

Age Dependent Regulation Of Cardiac Sodium Channel Gain Of Function, Madison Nowak, David Ryan King, Steven Poelzing, Seth Weinberg

Biology and Medicine Through Mathematics Conference

No abstract provided.


Physical And Thermal Properties Of Chia, Kañiwa, Triticale, And Farro Seeds As A Function Of Moisture Content, Rashid Suleiman, Kun Xie, Kurt A. Rosentrater 2019 Sokoine University of Agriculture

Physical And Thermal Properties Of Chia, Kañiwa, Triticale, And Farro Seeds As A Function Of Moisture Content, Rashid Suleiman, Kun Xie, Kurt A. Rosentrater

Kurt A. Rosentrater

The knowledge of physical and thermal properties in cereals, grains and oilseeds establishes an essential engineering tool for the design of equipment, storage structures, and processes. The physical properties and thermal properties for Chia, Kañiwa, Farro and Triticale grains were investigated at three levels of moisture content: 10%, 15% and 20% (d.b). Physical properties included 1000 seed weight, dimensions, mean diameters, surface area, volume, sphericity, and aspect ratio. Results indicated 1000 seed weight increased linearly with moisture content from 2.0 to 3.5 g for Chai, 2.5 to 4.0 g for Kañiwa, 42.7 to 48 ...


Self-Healing Materials For Soft-Matter Machines And Electronics, Michael D. Bartlett, Michael D. Dickey, Carmel Majidi 2019 Iowa State University

Self-Healing Materials For Soft-Matter Machines And Electronics, Michael D. Bartlett, Michael D. Dickey, Carmel Majidi

Michael Bartlett

The emergence of soft machines and electronics creates new opportunities to engineer robotic systems that are mechanically compliant, deformable, and safe for physical interaction with the human body. Progress, however, depends on new classes of soft multifunctional materials that can operate outside of a hard exterior and withstand the same real-world conditions that human skin and other soft biological materials are typically subjected to. As with their natural counterparts, these materials must be capable of self-repair and healing when damaged to maintain the longevity of the host system and prevent sudden or permanent failure. Here, we provide a perspective on ...


High-Pressure Phase Transformations Under Severe Plastic Deformation By Torsion In Rotational Anvils, Valery I. Levitas 2019 Iowa State University and Ames Laboratory

High-Pressure Phase Transformations Under Severe Plastic Deformation By Torsion In Rotational Anvils, Valery I. Levitas

Valery I. Levitas

Numerous experiments have documented that combination of severe plastic deformation and high mean pressure during high-pressure torsion in rotational metallic, ceramic, or diamond anvils produces various important mechanochemical effects. We will focus here on four of these: plastic deformation (a) significantly reduces pressure for initiation and completion of phase transformations (PTs), (b) leads to discovery of hidden metastable phases and compounds, (c) reduces PT pressure hysteresis, and (d) substitutes a reversible PT with irreversible PT. The goal of this review is to summarize our current understanding of the underlying phenomena based on multiscale atomistic and continuum theories and computational modeling ...


A Comparative Analysis Of Alliancing And Integrated Project Delivery On Complex Projects: Parallel Systems Sharing A Common Objective, Douglas D. Gransberg, H. David Jeong 2019 Iowa State University

A Comparative Analysis Of Alliancing And Integrated Project Delivery On Complex Projects: Parallel Systems Sharing A Common Objective, Douglas D. Gransberg, H. David Jeong

Douglas D. Gransberg

Relational contracting methods are a natural evolution from the many versions of project delivery that have been developed over the past two decades aimed at increasing the amount of integration and collaboration among mega-project stakeholders. Alliancing was born in the 1990’s in North Sea oilfields and imported down under to Australia and New Zealand where it has used to deliver over 300 complex projects. The litigious environment present in the North American construction sector led project owners to implement partnering programs to enhance the quality of relationships on projects of all sizes delivered using the full spectrum of delivery ...


Effective Tools For Projects Delivered By Construction Manager–General Contractor Method, Nicola West, Douglas D. Gransberg, James McMinimee 2019 Iowa State University

Effective Tools For Projects Delivered By Construction Manager–General Contractor Method, Nicola West, Douglas D. Gransberg, James Mcminimee

Douglas D. Gransberg

Construction manager–general contractor (CMGC) is an alternative project delivery method that is fast becoming more prevalently used to accelerate the delivery of highway projects. FHWA's Every Day Counts program is encouraging state departments of transportation (DOTs) to adopt CMGC as a tool to deliver badly needed rapid renewal projects. As part of the program, a CMGC Peer Exchange conference was held in June 2011 in Salt Lake City, Utah. This paper synthesizes the tools used in implementing CMGC project delivery that were reported in those conference presentations by state DOTs with CMGC experience. That information is compared with ...


Online Asynchronous Coded Caching, Hooshang Ghasemi, Aditya Ramamoorthy 2019 Iowa State University

Online Asynchronous Coded Caching, Hooshang Ghasemi, Aditya Ramamoorthy

Aditya Ramamoorthy

Coded caching is a technique for reducing peak data rate in content delivery systems that employ caching. The original formulation of the coded caching problem assumes that the file requests from the users are synchronous, i.e., they arrive at the same time. In this work, we consider the asynchronous setting where the file requests are revealed to the server in an online fashion. We propose a novel online algorithm for this problem building on our prior work for the offline setting (where the server knows the request arrival times and deadlines in advance). Our simulation results demonstrate that our ...


Immunofluorescence Image Feature Analysis And Clustering Pipeline For Distinguishing Epithelial-Mesenchymal Transition, Shreyas Hirway, Nadiah Hassan, Dr. Christopher Lemmon, Dr. Seth Weinberg 2019 Virginia Commonwealth University

Immunofluorescence Image Feature Analysis And Clustering Pipeline For Distinguishing Epithelial-Mesenchymal Transition, Shreyas Hirway, Nadiah Hassan, Dr. Christopher Lemmon, Dr. Seth Weinberg

Biology and Medicine Through Mathematics Conference

No abstract provided.


Coupled Influence Of Heart Rate Variability And Subcellular Calcium Heterogeneity On Cardiac Electromechanical Dynamics, Vrishti M. Phadumdeo, Seth H. Weinberg Ph.D 2019 Virginia Commonwealth University

Coupled Influence Of Heart Rate Variability And Subcellular Calcium Heterogeneity On Cardiac Electromechanical Dynamics, Vrishti M. Phadumdeo, Seth H. Weinberg Ph.D

Biology and Medicine Through Mathematics Conference

No abstract provided.


Virtual Eye: A Spatial-Temporal Bottom-Up Eye Sensitivity Model, Todd Goodall 2019 Purdue University

Virtual Eye: A Spatial-Temporal Bottom-Up Eye Sensitivity Model, Todd Goodall

MODVIS Workshop

Video quality and compression models use the

spatial contrast sensitivity function (CSF), which is solved

based on a linear system approximation. This function measures

the eye’s sensitivity to sinusoid gratings, ignoring the subtle

connectivity and inhomogeniety of cell density across the

visual field. Non-linear aspects of the eye, such as the change

in frequency sensitivity with changing illumination, are not

captured by this simple approximation. We propose Virtual

Eye, a bottom-up approach that models the spatio-temporal

dynamics of the eye across the visual field. Each functional

retinal cell layer in the eye is modeled using non-uniform spatial

cell responses ...


Access Mars: Assessing Cave Capabilities Establishing Specific Solutions: Final Report, Abdul Mohsen Al Husseini, Luis Alvarez Sanchez, Konstantinos Antonakopoulos, Jeffrey (Johannes) Apeldoorn, Kenneth Lowell Ashford Jr., Kutay Deniz Atabay, Sara Langston, et al. 2019 Selected Works

Access Mars: Assessing Cave Capabilities Establishing Specific Solutions: Final Report, Abdul Mohsen Al Husseini, Luis Alvarez Sanchez, Konstantinos Antonakopoulos, Jeffrey (Johannes) Apeldoorn, Kenneth Lowell Ashford Jr., Kutay Deniz Atabay, Sara Langston, Et Al.

Sara Langston

The human race has evolved, grown and expanded through the exploration of Earth. After initial steps on the Moon, our next challenge is to explore the solar system. Mars shows potential for both scientific discovery and future human settlement, and so is a prime candidate for the next leap of human exploration. Such a bold endeavor will be a driver for an unprecedented worldwide cooperative effort and the catalyst for a new era of international, intercultural and interdisciplinary human relations. Scientific and technological progress will also accelerate as mankind is ushered into a new era of space exploration.

Currently proposed ...


Quantified Measurement Of The Tilt Effect In A Family Of Café Wall Illusions, Nasim Nematzadeh Dr., David Martin Powers Prof. 2019 Flinders University

Quantified Measurement Of The Tilt Effect In A Family Of Café Wall Illusions, Nasim Nematzadeh Dr., David Martin Powers Prof.

MODVIS Workshop

This abstract explores the tilt effect in a family of Café Wall illusions using a Classical Gaussian Receptive Field model (CRF). Our model constructs an intermediate representation called edge map at multiple scales (Fig. 1) that reveals tilt cues and clues involved in the illusory perception of the Café Wall pattern. We investigate a wide range of parameters of the stimulus including mortar width, luminance, tiles contrast, and phase of the tile displacement (the stimuli in Fig. 2). We show that this simple bioplausible model, simulating the contrast sensitivity of the retinal ganglion cells, can not only detect the tilts ...


An Observer Model Version Of General Recognition Theory, Fabian Soto PhD 2019 Florida International University

An Observer Model Version Of General Recognition Theory, Fabian Soto Phd

MODVIS Workshop

No abstract provided.


The Challenge For Vision Of Fluctuating Real-World Illumination, David H. Foster 2019 University of Manchester

The Challenge For Vision Of Fluctuating Real-World Illumination, David H. Foster

MODVIS Workshop

No abstract provided.


Reducing Exposures Traffic-Related Air Pollution And Urban Building Design, Elliott Gall, Linda George 2019 Portland State University

Reducing Exposures Traffic-Related Air Pollution And Urban Building Design, Elliott Gall, Linda George

Linda A. George

No abstract provided.


Fracture Toughness Improvement Of 𝐀𝐥𝟐𝐎𝟑 Ceramics By Grain Size Control And Ductile Phase Reinforcement, Kesong Wang 2019 Washington University in St. Louis

Fracture Toughness Improvement Of 𝐀𝐥𝟐𝐎𝟑 Ceramics By Grain Size Control And Ductile Phase Reinforcement, Kesong Wang

Engineering and Applied Science Theses & Dissertations

This study used grain size control and ductile phase reinforcement to improve fracture toughness of 𝐀𝐥𝟐𝐎𝟑 ceramics. Alpha alumina particles of 100 nm, 0.5-1 micrometers, and 10 micrometers were coated with 1-5 nm nickel by electroless nickel plating (ENP). The coated powders were consolidated at 1200℃-1500℃ by spark plasma sintering (SPS). The sintered samples were annealed at 1100 oC for 1.5 hours and 10 hours to determine the effect of post sintering annealing on hardness and fracture toughness. Density of the samples were measured by the standard Archimedes method using a 5 mL pycnometer. Hardness values were ...


Green Glycol: A Novel 2-Step Process, Ingemar Falcones, Sarah Golden, Maria Kowalchuk 2019 University of Pennsylvania

Green Glycol: A Novel 2-Step Process, Ingemar Falcones, Sarah Golden, Maria Kowalchuk

Senior Design Reports (CBE)

Ethylene glycol demand is growing rapidly, particularly in the global polyethylene terephthalate markets.¹ Traditional production of non-renewable ethylene glycol involves steam cracking of ethane or the methanol-to-olefin process to obtain ethylene.6 In response to environmental movements, Coca-Cola® began creating ethylene glycol from renewably sourced ethanol, by producing the ethylene oxide intermediate in a two-step reaction process.² Novel research at Leiden University, entitled Direct conversion of ethanol into ethylene oxide on gold based catalysts, explores a catalyst which produces ethylene oxide in one step, showing potential for a more efficient renewable process.³ This project explores the scaling ...


Digital Commons powered by bepress