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2017

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Optimal Combined Long-Term Facility Design And Short-Term Operational Strategy For Chp Capacity Investments, Jose Mojica, Damon Petersen, Brigham Hansen, Kody Powell, John Hedengren Jan 2017

Optimal Combined Long-Term Facility Design And Short-Term Operational Strategy For Chp Capacity Investments, Jose Mojica, Damon Petersen, Brigham Hansen, Kody Powell, John Hedengren

Faculty Publications

This work presents a detailed case study for the optimization of the expansion of a district energy system evaluating the investment decision timing, type of capacity expansion, and fine-scale operational modes. The study develops an optimization framework to find the investment schedule over 30 years with options of investing in traditional heating sources (boilers) or a next-generation combined heat and power (CHP) plant that provides heat and electricity. In district energy systems, the selected capacity and type of system is dependent on demand-side requirements, energy prices, and environmental costs. This work formulates capacity planning over a time horizon as a …

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Development Of Bio-Based Wood Adhesive By Using Cellulose Nanofiber Reinforcement And Crosslinking Agent For Improved Bonding Strength, Myungkeun Oh Jan 2017

Development Of Bio-Based Wood Adhesive By Using Cellulose Nanofiber Reinforcement And Crosslinking Agent For Improved Bonding Strength, Myungkeun Oh

Materials and Nanotechnology

Engineered woods, plywood, particle board, and oriented strand board, are widely used as a low-cost wood replacement in many applications. Many of the currently used wood adhesives contain chemicals that are harmful to human health and the environment. Increasing environmental and human health concerns have made the development of safe bio-based adhesives a priority. In this study, two plant proteins, zein from corn and wheat gluten, were used to develop wood adhesives. To increase their bond strength, cellulose nanofibers were added to create nanocomposite adhesives and a crosslinking agent was also used. Single-lap shear test, flexural and internal bond tests …

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Mechanical Properties Of Multilayers Of Carbon Nanotube Polystyrene Nanocomposites, Eid Ali Almutairi Jan 2017

Mechanical Properties Of Multilayers Of Carbon Nanotube Polystyrene Nanocomposites, Eid Ali Almutairi

Materials and Nanotechnology

We have studied the mechanical behavior of multi-layered composite films comprised of single-wall carbon nanotubes and polystyrene polymer, where we focused on three targeted layer thicknesses; 10 nm, 20 nm, and 40 nm. The approach we used is the Strain-Induced Elastic Buckling Instability for Mechanical Measurements (SIEBIFMM) technique, which allows us to measure the Young modulus of the films as a function of layer thickness and the number of layers by inducing a compressive stress in the films at different strains; 1 %, 2.5 %, 5 %, 7.5 %, and 10 %. Polystyrene was added in an effort to reduce …

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Stochastic Budgeting And Input Breakeven Analysis In North Dakota Potato Production, Alan Bingham Jan 2017

Stochastic Budgeting And Input Breakeven Analysis In North Dakota Potato Production, Alan Bingham

Plant Sciences

Enterprise budgets were developed for non-irrigated red and irrigated russet potato production, based on North Dakota model farms. Costs and revenues vary among producers, thus budgets are intended to serve as a template for producers to use and manipulate to suit their individual circumstances. These budgets and stochastic (Monte Carlo) simulation were utilized in order to analyze and quantify financial risk in each respective enterprise. Simulated net returns for non-irrigated production ranged from -$1,324 to $2,757 per acre, while irrigated returns were between -$551 and $1,616 per acre. On farms where fumigation is a typical practice, it is one of …

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Controlled Manipulation Of Floating Objects On Deformed Fluid Interfaces And Conditions For Stable Equilibria, Jose M. Carballo, Qi Ni, Jose Vasquez, Nathan B. Crane Jan 2017

Controlled Manipulation Of Floating Objects On Deformed Fluid Interfaces And Conditions For Stable Equilibria, Jose M. Carballo, Qi Ni, Jose Vasquez, Nathan B. Crane

Faculty Publications

At the millimeter scale, interactions between floating and semi-immersed objects are significant. The local curvature of the interface is modified by the weight/buoyancy forces of floating objects, and by the surface properties of semi-immersed objects. The curvature changes generate attractive (or repulsive) interactions between floating parts, and semi-immersed objects. This work demonstrates how electrowetting can manipulate these interactions in order to position, align, assemble and transport parts attached to the fluid interface. This demonstrates one way in which fluid interfaces can provide an alternative to standard pick and place technology for part positioning/assembly. Typically, the part/rod forces are purely attractive …

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Enhancing Ductility Of Wwr Slabs, Mohamed Shwani, Taylor J. Sorensen, Ethan Pickett, Parker Syndergaard, Marc Maguire Jan 2017

Enhancing Ductility Of Wwr Slabs, Mohamed Shwani, Taylor J. Sorensen, Ethan Pickett, Parker Syndergaard, Marc Maguire

Faculty Publications

A series of research studies have recently identified an issue called strain localization in welded wire reinforced (WWR) members. This phenomenon reportedly concentrates strains at welded cross wire locations and severely limit ductility. Those that identified the phenomenon used it to imply that WWR is unsafe because it does not warn of failure. This research program is investigating details to mitigate the strain localization effect and demonstrate the WWR can be used safely. Sixteen beams have been constructed using WWR and rebar with various cross wire spacing, using a realistic design. The strain localization phenomenon was not demonstrated, but WWR …

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Investigating Composite Action At Ultimate For Commercial Sandwich Panel Composite Connectors, Salam Al-Rubaye, Taylor J. Sorensen, Marc Maguire Jan 2017

Investigating Composite Action At Ultimate For Commercial Sandwich Panel Composite Connectors, Salam Al-Rubaye, Taylor J. Sorensen, Marc Maguire

Faculty Publications

To achieve full or partial-composite action in prestressed concrete sandwich panel walls, the engineer must obtain a percent composite action from a connector manufacturer, making some engineers uncomfortable. Engineers are dependent upon the recommendations given by the connector manufacturers to establish their designs. This project tested six full-scale sandwich panel walls to evaluate the percent composite action of various connectors and compare the results to those provided by the composite connector manufacturers. This study concluded that the reported degrees of composite action from each manufacturer are considered conservative in all instances for the connectors tested in this paper. Additionally, the …

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Developing A General Methodology For Evaluating Composite Action In Insulated Wall Panels, Taylor Sorensen Jan 2017

Developing A General Methodology For Evaluating Composite Action In Insulated Wall Panels, Taylor Sorensen

Faculty Publications

Precast concrete sandwich wall panels (PCSWPs) have been in use for over 60 years. They provide a very efficient building envelope for many buildings. Characteristic PCSWPs comprise an outer and inner layer (or wythe) of concrete separated by an insulating material. To use all of the material as efficiently as possible, the layers are attached by connectors which penetrate through the insulating layer and are embedded in either concrete wythe. These connectors make it possible for both layers of the wall to work together when resisting loads. The connectors are made out of plastic, or FRP, to prevent heat transfer …

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Middle School Student Habits, Perceptions, And Self-Directed Learning, Scott R. Bartholomew Jan 2017

Middle School Student Habits, Perceptions, And Self-Directed Learning, Scott R. Bartholomew

Faculty Publications

Today’s students are growing up in a digital world with constant connectivity, instant access to information, and new technological developments at every turn. The feasibility, effectiveness, and possibilities of students leveraging technological tools around them for learning are the subject of continual debate (Becker, 2017; Bowen, 2012; Tamim, Bernard, Borokhovski, Abrami, & Schmid, 2011). In this study, 706 middle school students from 18 classes worked in groups of 2-3 to complete an open-ended engineering design challenge. Students completed design portfolios and constructed prototypes in their groups in response to the design challenge. Classes were divided with some receiving access to …

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An Exploration Of The Effects Of Cattle Grazing, Prairie Dog Activity, And Ecological Site On Plant Community Composition And Western Wheatgrass Vegetative Reproduction In Northern Mixed Grass Prairie, Aaron Lee Field Jan 2017

An Exploration Of The Effects Of Cattle Grazing, Prairie Dog Activity, And Ecological Site On Plant Community Composition And Western Wheatgrass Vegetative Reproduction In Northern Mixed Grass Prairie, Aaron Lee Field

Range Science

Modern range scientists and managers are tasked with feeding more people than ever before while maintaining or improving the ecological function of over half of the world’s land surface. Often, these tasks are in conflict. This disparity is evident in the relationship between rangeland livestock producers and black-tailed prairie dogs (Cynomys ludoviciana). Prairie dogs are considered a keystone species and an ecosystem engineer, but they also reduce available forage for livestock. In this disquisition we investigated the dynamic relationship between prairie dog activities and cattle grazing in respect to their combined and separate influences on plant community composition and western …

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Fundamental Principles Of Tremor Propagation In The Upper Limb, Andrew D. Davidson, Steven Knight Charles Jan 2017

Fundamental Principles Of Tremor Propagation In The Upper Limb, Andrew D. Davidson, Steven Knight Charles

Faculty Publications

Although tremor is the most common movement disorder, there exist few effective tremor-suppressing devices, in part because the characteristics of tremor throughout the upper limb are unknown. To clarify, optimally suppressing tremor requires a knowledge of the mechanical origin, propagation, and distribution of tremor throughout the upper limb. Here we present the first systematic investigation of how tremor propagates between the shoulder, elbow, forearm, and wrist. We simulated tremor propagation using a linear, time-invariant, lumped-parameter model relating joint torques and the resulting joint displacements. The model focused on the seven main degrees of freedom from the shoulder to the wrist …

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Surfing The Semester: A Study Of The Flow Of Active Learning Implementation, Rebecca Sue Davidson Reichenbach Jan 2017

Surfing The Semester: A Study Of The Flow Of Active Learning Implementation, Rebecca Sue Davidson Reichenbach

Biological Sciences

Instructional reforms have been called for on a national level. Little data exists as to how changes take place. This study explored the implementation of active learning practices by non-tenure and tenure track faculty over the course of a semester. Faculty were introduced to evidence based pedagogy through workshops and faculty learning communities. Their instructional practices within a semester were tracked through observations conducted using the Classroom Observation Protocol for Undergraduate STEM (COPUS). Interviews were conducted to gain insight into reasons for instructional trends. A general trend downward was observed through the semester but was not found to be statistically …

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Response Of Russet Burbank Seed Tubers Containing Glyphosate And Dicamba Residues, Nelson Dee Geary Jan 2017

Response Of Russet Burbank Seed Tubers Containing Glyphosate And Dicamba Residues, Nelson Dee Geary

Plant Sciences

The introduction of dicamba-tolerant soybean will increase the risk of potato injury to dicamba. The objective was to determine the effects of ‘Russet Burbank’ potato seed tuber emergence and yield that were exposed to dicamba and glyphosate the previous year. Field experiments were conducted in 2016 and 2017 to evaluate seed tubers from mother plants that were treated the previous year with glyphosate (8, 40 and 197 g ae ha-1), dicamba (4, 20 and 99 g ai ha-1) and glyphosate plus dicamba. The rates of 99 g ha-1 dicamba, 197 g ha-1 glyphosate and combination of rates caused 17 to …

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Diasporic Transnationalism In Zoë Wicomb’S "The One That Got Away" And "October", Aaron Eastley Jan 2017

Diasporic Transnationalism In Zoë Wicomb’S "The One That Got Away" And "October", Aaron Eastley

Faculty Publications

Whereas the early works of South African/Scottish writer Zoë Wicomb delved into racial tensions caused by apartheid, her more recent works excavate diasporic tensions tied to present-day travel and transnationalism. In her 2009 short story collection The One That Got Away and her 2014 novel October, Wicomb presents a series of narratives in which Cape Town and Glasgow collide. In these narratives Wicomb gravitates toward the experiences of mostly middle-class immigrants and visitors, often in later stages of life, operating in the relatively established multiculturalism of today's South Africa and UK. The irony of present-day transnational mobility as Wicomb …

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Modeling Effects Of Annealing On Coal Char Reactivity To O2 And Co2, Based On Preparation Conditions, Troy Michael Holland, Sham Bhat, Peter Marcy, James Gattiker, Joel D. Kress, Thomas H. Fletcher Jan 2017

Modeling Effects Of Annealing On Coal Char Reactivity To O2 And Co2, Based On Preparation Conditions, Troy Michael Holland, Sham Bhat, Peter Marcy, James Gattiker, Joel D. Kress, Thomas H. Fletcher

Faculty Publications

Oxy-fired coal combustion is a promising potential carbon capture technology. Predictive computational fluid dynamics (CFD) simulations are valuable tools in evaluating and deploying oxyfuel and other carbon capture technologies, either as retrofit technologies or for new construction. However, accurate predictive combustor simulations require physically realistic submodels with low computational requirements. A recent sensitivity analysis of a detailed char conversion model (Char Conversion Kinetics (CCK)) found thermal annealing to be an extremely sensitive submodel. In the present work, further analysis of the previous annealing model revealed significant disagreement with numerous datasets from experiments performed after that annealing model was developed. The …

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Comprehensive Model Of Single Particle Pulverized Coal Combustion Extended To Oxy-Coal Conditions, Troy Michael Holland, Thomas H. Fletcher Jan 2017

Comprehensive Model Of Single Particle Pulverized Coal Combustion Extended To Oxy-Coal Conditions, Troy Michael Holland, Thomas H. Fletcher

Faculty Publications

Oxy-fired coal combustion is a promising potential carbon capture technology. Predictive CFD simulations are valuable tools in evaluating and deploying oxy-fuel and other carbon capture technologies either as retrofit technologies or for new construction. However, accurate predictive simulations require physically realistic submodels with low computational requirements. In particular, comprehensive char oxidation and gasification models have been developed that describe multiple reaction and diffusion processes. This work extends a comprehensive char conversion code (CCK), which treats surface oxidation and gasification reactions as well as processes such as film diffusion, pore diffusion, ash encapsulation, and annealing. In this work several submodels in …

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Semi-Empirical Model For Fire Spread In Shrubs With Spatially-Defined Fuel Elements And Flames, Dallan Prince, Chen Shen, Thomas H. Fletcher Jan 2017

Semi-Empirical Model For Fire Spread In Shrubs With Spatially-Defined Fuel Elements And Flames, Dallan Prince, Chen Shen, Thomas H. Fletcher

Faculty Publications

A semi-empirical model was developed which forms shrub geometries from distinct fuel elements (e.g. leaves) and describes flame spread from element to element. Ignition, flame growth and flame decay patterns were based on combustion data of single leaves. Extension of the model to various heating conditions was achieved by scaling the flame growth parameters using physics-based heat transfer models. The resulting model offers a novel approach to examine fire spread and to explicitly describe both distinct fuel elements and fire behavior. This approach balances computational speed and modeling detail while providing a unique perspective into fire spread phenomena. Comparisons of …

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Modeling Soot Oxidation And Gasification With Bayesian Statistics, Alexander Jon Josephson, Neal D. Gaffin, Sean T. Smith, Thomas H. Fletcher, David Lignell Jan 2017

Modeling Soot Oxidation And Gasification With Bayesian Statistics, Alexander Jon Josephson, Neal D. Gaffin, Sean T. Smith, Thomas H. Fletcher, David Lignell

Faculty Publications

This paper presents a statistical method for model calibration using data collected from literature. The method is used to calibrate parameters for global models of soot consumption in combustion systems. This consumption is broken into two different submodels: first for oxidation where soot particles are attacked by certain oxidizing agents; second for gasification where soot particles are attacked by H2O or CO2 molecules. Rate data were collected from 19 studies in the literature and evaluated using Bayesian statistics to calibrate the model parameters. Bayesian statistics are valued in their ability to quantify uncertainty in modeling. The calibrated consumption model with …

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Model For The Evolution Of Pore Structure In A Lignite Particle During Pyrolysis. 2. Influence Of Cross-Linking Reactions, Molten Metaplast, And Molten Ash On Particle Surface Area, He Yang, Thomas H. Fletcher, Sufen Li, Haoquan Hu, Lijun Li Jan 2017

Model For The Evolution Of Pore Structure In A Lignite Particle During Pyrolysis. 2. Influence Of Cross-Linking Reactions, Molten Metaplast, And Molten Ash On Particle Surface Area, He Yang, Thomas H. Fletcher, Sufen Li, Haoquan Hu, Lijun Li

Faculty Publications

A model for the evolution of the pore structure in a lignite particle during pyrolysis was established previously based on the chemical percolation devolatilization (CPD) model, using coal polymer network parameters to calculate the surface area and porosity of the particle. In this paper, to get the accurate surface area of coal particle at high pyrolysis temperature, the previous model was improved by considering the effects of cross-linking reactions, molten Metaplast, and ash. The good agreement of the predicted surface area with experiments at temperature below 1200 K in the previous model is maintained, and model accuracy is improved at …

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Schizconnect: Mediating Neuroimaging Databases On Schizophrenia And Related Disorders For Large-Scale Integration, Derin J. Cobia, Lei Wang, Kathryn I. Alpert, Vince D. Calhoun, David B. Keator, Margaret D. King, Alexandr Kogan, Drew Landis, Marcelo Tallis, Matthew D. Turner, Steven G. Potkin, Jessica A. Turner, Jose Luis Ambite Jan 2017

Schizconnect: Mediating Neuroimaging Databases On Schizophrenia And Related Disorders For Large-Scale Integration, Derin J. Cobia, Lei Wang, Kathryn I. Alpert, Vince D. Calhoun, David B. Keator, Margaret D. King, Alexandr Kogan, Drew Landis, Marcelo Tallis, Matthew D. Turner, Steven G. Potkin, Jessica A. Turner, Jose Luis Ambite

Faculty Publications

SchizConnect (www.schizconnect.org) is built to address the issues of multiple data repositories in schizophrenia neuroimaging studies. It includes a level of mediation—translating across data sources—so that the user can place one query, e.g. for diffusion images from male individuals with schizophrenia, and find out from across participating data sources how many datasets there are, as well as downloading the imaging and related data. The current version handles the Data Usage Agreements across different studies, as well as interpreting database-specific terminologies into a common framework. New data repositories can also be mediated to bring immediate access to existing datasets. Compared with …

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The Effects Of Gamification On Corporate Compliance Training: A Field Experiment Of True Office Anti-Corruption Training Programs, Ryan J. Baxter, D. Kip Holderness, David A. Wood Jan 2017

The Effects Of Gamification On Corporate Compliance Training: A Field Experiment Of True Office Anti-Corruption Training Programs, Ryan J. Baxter, D. Kip Holderness, David A. Wood

Faculty Publications

Companies rely on internal controls to comply with the U.S. Foreign Corrupt Practices Act and the U.K. Bribery Act. One such control is anti-corruption employee training. Although corporate training is a key component of anti-fraud policies and procedures, it is often perceived as dull by employees. To motivate greater engagement, firms are experimenting with training that involves elements of digital games, known as gamification. We perform a field experiment with 158 employees of a large, multinational bank to examine the effectiveness of gamified anticorruption training. We find that employees strongly prefer gamified training to traditional, nongamified training and that gamified …

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Factors Influencing Recruitment Of Non-Accounting Business Professionals Into Internal Auditing, Geoffrey D. Bartlett, Joleen Kremin, K. Kelli Saunders, David A. Wood Jan 2017

Factors Influencing Recruitment Of Non-Accounting Business Professionals Into Internal Auditing, Geoffrey D. Bartlett, Joleen Kremin, K. Kelli Saunders, David A. Wood

Faculty Publications

This paper examines factors affecting non-accounting business professionals’ willingness to work in internal auditing. In a 2 x 6 experiment with 502 participants from across the country, we find that, in contrast to prior research examining accountants, business professionals have relatively favorable views of internal audit. Although they hold favorable views, participants were still less likely to apply for a position labeled as internal audit than an identical position with an alternate label. Varying the structure of internal audit, including job responsibilities, career path, and sourcing arrangement, did not affect participants’ willingness to apply for an internal audit position. We …

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The Value Of A Master’S Degree To Recreation Professionals, Camilla J. Hodge, Brian J. Hill, Christian Brinton Jan 2017

The Value Of A Master’S Degree To Recreation Professionals, Camilla J. Hodge, Brian J. Hill, Christian Brinton

Faculty Publications

This study assessed the nature of the relationship between earning advanced degrees and career outcomes such as salary, job satisfaction, social capital, and human capital among professionals in the parks and recreation field. The sample (n = 196) was drawn from parks and recreation agencies located in the United States. Agencies, excluding educational institutions, were identified via an Internet search for parks and recreation agencies in urban areas. Findings indicated there was a positive relationship between earning a master’s degree and salary. Earning a master’s degree, however, was not significantly related to job satisfaction, social capital, or human capital. Furthermore, …

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The Missing Framework For Virtually Assisted Activities, Jacob Steffen, James Gaskin, Thomas Meservy, Jeffrey Jenkins Jan 2017

The Missing Framework For Virtually Assisted Activities, Jacob Steffen, James Gaskin, Thomas Meservy, Jeffrey Jenkins

Faculty Publications

Various frameworks and taxonomies exist that classify virtual reality (VR), augmented reality (AR), and mixed reality (MR) by their attributes and technical specifications. However, no extant frameworks specifically classify the activities executed with VR and AR devices, which we refer to as virtually assisted activities (VAAs). In the context of past definitions and frameworks of VR and AR, we present a framework for VAAs that examines the underlying motivations for virtualizing some aspect of an activity. By so doing, VAAs are easily compared to similar non-virtualized activities done in physical reality, VR is better compared with AR, and potential benefits …

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A Video-Based Screening System For Automated Risk Assessment Using Nuanced Facial Features, Steven J. Pentland, Nathan W. Twyman, Judee K. Burgoon, Jay F. Nunamaker, Christopher B.R. Diller Jan 2017

A Video-Based Screening System For Automated Risk Assessment Using Nuanced Facial Features, Steven J. Pentland, Nathan W. Twyman, Judee K. Burgoon, Jay F. Nunamaker, Christopher B.R. Diller

Faculty Publications

This study investigates the development of an automated interviewing system that uses facial behavior as an indicator of the risk of given illicit behavior. Traditional facial emotion indicators of risk in semistructured dialogue may have limitations in an automated approach. However, an initial analysis of mock crime interviews suggests that the face may exhibit some form of rigidity during highly structured interviews. An interviewing system design using facial rigidity analysis was implemented and experimentally evaluated, the results of which further reveal that the rigidity is fairly generalized across the face. Whereas existing theory traditionally focuses on leakage of facial expressions, …

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Conceptual Modeling In Accelerating Information Ingest Into Family Tree, David W. Embley, Stephen W. Liddle, Tanner S. Eastmond, Deryle W. Lonsdale, Joseph P. Price, Scott N. Woodfield Jan 2017

Conceptual Modeling In Accelerating Information Ingest Into Family Tree, David W. Embley, Stephen W. Liddle, Tanner S. Eastmond, Deryle W. Lonsdale, Joseph P. Price, Scott N. Woodfield

Faculty Publications

Family Tree is a wiki-like shared repository of interconnected family genealogies. Because information ingested into the tree requires human authorization as verified in source documents, ingest is tedious and time-consuming. To significantly increase ingest efficiency while maintaining human oversight, we propose a pipeline of tools and techniques to transform source document genealogical assertions into verified information in the Family Tree data repository. The automation pipeline transforms pages of printed, scanned and OCRed family history books into a GEDCOM X conceptualization that can be ingested into Family Tree. All steps of the pipeline are fundamentally grounded in ontological conceptualizations. We report …

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Microcore: A Playable Case Study For Improving Adolescents’ Argumentative Writing In A Workplace Context, Derek L. Hansen, Jonathan Balzotti, Lauren Fine, Daniel Ebeling Jan 2017

Microcore: A Playable Case Study For Improving Adolescents’ Argumentative Writing In A Workplace Context, Derek L. Hansen, Jonathan Balzotti, Lauren Fine, Daniel Ebeling

Faculty Publications

A playable case study is an immersive, transmedia story controlled by a puppetmaster (i.e., teacher), but played by participants who advance the plot through their contributions and interactions with fictional characters. They are also explicitly educational, consisting of both the immersive, transmedia story, as well as in-game and out-of-game materials provided for educational scaffolding and reflection. We present the Microcore playable case study to illustrate the potential of this new type of experiential simulation that incorporates aspects of Alternate Reality Games (ARGs) to increase immersion. We present results from a pilot test of Microcore with an undergraduate course, identifying design …

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Racial Identity, Phenotype, And Self-Esteem Among Biracial Polynesian/White Individuals, Kawika Allen, Patton O. Garriott, Carla J. Reyes, Catherine Hsieh Jan 2017

Racial Identity, Phenotype, And Self-Esteem Among Biracial Polynesian/White Individuals, Kawika Allen, Patton O. Garriott, Carla J. Reyes, Catherine Hsieh

Faculty Publications

This study examined racial identity, self-esteem, and phenotype among biracial Polynesian/White adults. Eighty-four Polynesian/White persons completed the Biracial Identity Attitude Scale, the Rosenberg Self-Esteem Inventory, and a Polynesian phenotype scale. Profile analyses showed participants identified more with their Polynesian parent. A mediation analysis revealed that phenotype did not mediate the relationship between biracial identity and self-esteem.

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Improving Sensitivity Of Electrochemical Sensors With Convective Transport In Free-Standing, Carbon Nanotube Structures, Benjamin J. Brownlee, Kevin M. Marr, Jonathan C. Claussen, Brian D. Iverson Jan 2017

Improving Sensitivity Of Electrochemical Sensors With Convective Transport In Free-Standing, Carbon Nanotube Structures, Benjamin J. Brownlee, Kevin M. Marr, Jonathan C. Claussen, Brian D. Iverson

Faculty Publications

High-aspect-ratio, porous membrane of vertically-aligned carbon nanotubes (CNTs) were developed through a templated microfabrication approach for electrochemical sensing. Nanostructured platinum (Pt) catalyst was deposited onto the CNTs with a facile, electroless deposition method, resulting in a Pt-nanowire-coated, CNT sensor (PN-CNT). Convection mass transfer enhancement was shown to improve PN-CNT sensor performance in the non-enzymatic, amperometric sensing of hydrogen peroxide (H2O2). In particular, convective enhancement was achieved through the use of high surface area to fluid volume structures and concentration boundary layer confinement in a channel. Stir speed and sensor orientation especially influenced the measured current in …

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Gradient-Based Optimization Of Wind Farms With Different Turbine Heights, Andrew P.J. Stanley, Jared Thomas, Andrew Ning, Jennifer Annoni, Katherine Dykes, Paul Fleming Jan 2017

Gradient-Based Optimization Of Wind Farms With Different Turbine Heights, Andrew P.J. Stanley, Jared Thomas, Andrew Ning, Jennifer Annoni, Katherine Dykes, Paul Fleming

Faculty Publications

Turbine wakes reduce power production in a wind farm. Current wind farms are gen- erally built with turbines that are all the same height, but if wind farms included turbines with different tower heights, the cost of energy (COE) may be reduced. We used gradient-based optimization to demonstrate a method to optimize wind farms with varied hub heights. Our study includes a modified version of the FLORIS wake model that accommodates three-dimensional wakes integrated with a tower structural model. Our purpose was to design a process to minimize the COE of a wind farm through layout optimization and varying turbine …

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