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Cam-Based Passive Variable Friction Device For Structural Control, Austin Downey, Connor Theisen, Heather Murphy, Nicholas Anastasi, Simon Laflamme 2019 University of South Carolina - Columbia

Cam-Based Passive Variable Friction Device For Structural Control, Austin Downey, Connor Theisen, Heather Murphy, Nicholas Anastasi, Simon Laflamme

Civil, Construction and Environmental Engineering Publications

A solution to increasing the resiliency of civil structures with respect to natural and man-made hazards is the implementation of supplemental damping systems. These systems can be constructed using passive, active, and semi-active devices. In particular, passive devices are widely accepted in the field of structural engineering, because they do not require power to operate and can be holistically integrated into the structural design process. This paper investigates the use of 3D printing technology to expand on the possibilities in passive damping, notably in the fabrication of a variable friction device. This device uses a 3D printed cam with a ...


Quantifying Bonding Characteristics Between Uhpc And Normal-Strength Concrete For Bridge Deck Application, Sriram Aaleti, Sri Sritharan 2019 University of Alabama - Tuscaloosa

Quantifying Bonding Characteristics Between Uhpc And Normal-Strength Concrete For Bridge Deck Application, Sriram Aaleti, Sri Sritharan

Civil, Construction and Environmental Engineering Publications

Ultrahigh performance concrete (UHPC) is an advanced cementitious material which has excellent mechanical and durability properties, making it appropriate for the rehabilitation of concrete structures. This paper investigates the usage of a thin layer of UHPC overlaying a normal strength concrete (NC) deck. The behavior of the interface connection will have a significant impact on the overall structural and durability performance of the UHPC-NC composite deck system. An integrated experimental and analytical study was conducted to understand the influence of several variables, such as normal concrete strength, interface roughness, and curing condition on the shear transfer behavior across the interface ...


Identification Of The Impacts Of Code Changes On The Security Of Software, Moataz Abdelkhalek, Ameerah-Muhsina Jamil, Lotfi ben Othmane 2019 Iowa State University

Identification Of The Impacts Of Code Changes On The Security Of Software, Moataz Abdelkhalek, Ameerah-Muhsina Jamil, Lotfi Ben Othmane

Lotfi ben Othmane

Companies develop their software in versions and iterations. Ensuring the security of each additional version using code review is costly and time consuming. This paper investigates automated tracing of the impacts of code changes on the security of a given software. To this end, we use call graphs to model the software code, and security assurance cases to model the security requirements of the software. Then we relate assurance case elements to code through the entry point methods of the software, creating a map of monitored security functions. This mapping allows to evaluate the security requirements that are affected by ...


Coinage Metal–Sulfur Complexes: Stability On Metal(111) Surfaces And In The Gas Phase, Jiyoung Lee, Theresa L. Windus, Patricia A. Thiel, James W. Evans, Da-Jiang Liu 2019 Iowa State University and Ames Laboratory

Coinage Metal–Sulfur Complexes: Stability On Metal(111) Surfaces And In The Gas Phase, Jiyoung Lee, Theresa L. Windus, Patricia A. Thiel, James W. Evans, Da-Jiang Liu

James W. Evans

We provide a comprehensive theoretical assessment at the level of density functional theory (DFT) of the stability of various coinage metal–sulfur complexes, both in the gas phase and also for the complexes adsorbed on the (111) surface of the same coinage metal. Our primary interest lies in the latter where earlier scanning tunneling microscopy (STM) experiments were interpreted to suggest the existence of adsorbed S-decorated metal trimers, sometimes as a component of more complex adlayer structures. Recent STM studies at 5 K directly observed other isolated adsorbed metal–sulfur complexes. For these adsorbed species, we calculate various aspects of ...


Coinage Metal–Sulfur Complexes: Stability On Metal(111) Surfaces And In The Gas Phase, Jiyoung Lee, Theresa L. Windus, Patricia A. Thiel, James W. Evans, Da-Jiang Liu 2019 Iowa State University and Ames Laboratory

Coinage Metal–Sulfur Complexes: Stability On Metal(111) Surfaces And In The Gas Phase, Jiyoung Lee, Theresa L. Windus, Patricia A. Thiel, James W. Evans, Da-Jiang Liu

Patricia A. Thiel

We provide a comprehensive theoretical assessment at the level of density functional theory (DFT) of the stability of various coinage metal–sulfur complexes, both in the gas phase and also for the complexes adsorbed on the (111) surface of the same coinage metal. Our primary interest lies in the latter where earlier scanning tunneling microscopy (STM) experiments were interpreted to suggest the existence of adsorbed S-decorated metal trimers, sometimes as a component of more complex adlayer structures. Recent STM studies at 5 K directly observed other isolated adsorbed metal–sulfur complexes. For these adsorbed species, we calculate various aspects of ...


Coinage Metal–Sulfur Complexes: Stability On Metal(111) Surfaces And In The Gas Phase, Jiyoung Lee, Theresa L. Windus, Patricia A. Thiel, James W. Evans, Da-Jiang Liu 2019 Iowa State University and Ames Laboratory

Coinage Metal–Sulfur Complexes: Stability On Metal(111) Surfaces And In The Gas Phase, Jiyoung Lee, Theresa L. Windus, Patricia A. Thiel, James W. Evans, Da-Jiang Liu

Theresa Windus

We provide a comprehensive theoretical assessment at the level of density functional theory (DFT) of the stability of various coinage metal–sulfur complexes, both in the gas phase and also for the complexes adsorbed on the (111) surface of the same coinage metal. Our primary interest lies in the latter where earlier scanning tunneling microscopy (STM) experiments were interpreted to suggest the existence of adsorbed S-decorated metal trimers, sometimes as a component of more complex adlayer structures. Recent STM studies at 5 K directly observed other isolated adsorbed metal–sulfur complexes. For these adsorbed species, we calculate various aspects of ...


Predicting Tgf-Β-Induced Epithelial-Mesenchymal Transition Using Data Assimilation, Mario J. Mendez, Matthew J. Hoffman, Elizabeth M. Cherry, Dr. Christopher Lemmon, Seth Weinberg 2019 Virginia Commonwealth University

Predicting Tgf-Β-Induced Epithelial-Mesenchymal Transition Using Data Assimilation, Mario J. Mendez, Matthew J. Hoffman, Elizabeth M. Cherry, Dr. Christopher Lemmon, Seth Weinberg

Biology and Medicine Through Mathematics Conference

No abstract provided.


Color Transparency From Motions Of Backgrounds And Overlays, Zhehao Huang, Qasim Zaidi 2019 Graduate Center for Vision Research, State University of New York

Color Transparency From Motions Of Backgrounds And Overlays, Zhehao Huang, Qasim Zaidi

MODVIS Workshop

No abstract provided.


Numerical Simulation Of Flow Past Naca 0012 Airfoil Using A Co-Flow Jet At Different Injection Angles To Control Lift And Drag, Da Xiao 2019 Washington University in St. Louis

Numerical Simulation Of Flow Past Naca 0012 Airfoil Using A Co-Flow Jet At Different Injection Angles To Control Lift And Drag, Da Xiao

Engineering and Applied Science Theses & Dissertations

ABSTRACT OF THE THESIS

Numerical Simulation of flow Past NACA 0012 Airfoil Using a Co-Flow Jet at Different Injection Angles to Control Lift and Drag

by

Da Xiao

Master of Science in Mechanical Engineering

Washington University in St. Louis, 2019

Research Advisor: Professor Ramesh K. Agarwal

The focus of this thesis is to numerically study the aerodynamic performance of an airfoil by employing the active flow control from a co-flow jet (CFJ) near the leading edge. The study is conducted by changing the injection angle of CFJ on a location close to the leading edge on the upper surface of ...


Microfluidic Assessment Of Stem Cell-Derived Pancreatic Beta Cells, Arvind Rajamani Srivatsava 2019 Washington University in St. Louis

Microfluidic Assessment Of Stem Cell-Derived Pancreatic Beta Cells, Arvind Rajamani Srivatsava

Engineering and Applied Science Theses & Dissertations

Contemporary and traditional methods of perifusional analysis of cells, pancreatic β cells in particular, involve the utilization of costly equipment exhibiting difficulties in setup and inflexibilities in operation and application. Microfluidic devices in general are inexpensive, easy to fabricate and are capable of screening multiple microenvironmental conditions, with the potential to generate concentration gradients for the study of biological phenomena such as cell migration. Utilization of these devices for cellular fluorescence imaging is also possible, paving the way for more sophisticated methods of dynamic assessment. Herein, we fabricated a pre-designed microfluidic device from photolithography, containing microwells capable of immobilizing human ...


Spring 2019, 2019 DePaul University

Spring 2019

In The Loop

Lab Life: New and improved School of Computing labs inspire research in robotics and engineering; A Festival to Remember: Students thrive in film festival environments; Next Gen Data Scientists: Data Science Academy introduces high school students to the big world of data; A Well-Designed Design Colloquium; Game Face: "Sausage Sports Club: creator and CDM alumnus Chris Wade shares the story behind his playful Nintendo Switch game: Connected from Afar: Graduate student Sierra Sellman makes the most of her online degree program; Seen and Heard; Bravo! Bravo!


Mitchell Dissertation Final 5-12-19 (2).Pdf, Brett Mitchell 2019 Chapman University

Mitchell Dissertation Final 5-12-19 (2).Pdf, Brett Mitchell

Brett Mitchell

ABSTRACT
Policy Alternatives That Provide California School Districts With the Policy Options Necessary to Develop Facilities to Enhance Student Learning Opportunities and Optimize Financial Resources 
by Brett A. Mitchell
Purpose: The purpose of this study was to develop policy alternatives by the years 2019 to 2025 that would assist state policy makers, legislators, and advocates in adding definition to California school facility development and funding.  
Methodology: This study involved descriptive statistics using a Delphi study method.  Within the theoretical framework established for policy analysis, this Delphi study was inclusive of the knowledge and expertise of an expert panel that was ...


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 ...


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