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Articles 1 - 30 of 32
Full-Text Articles in Engineering
Increasing Parameter Certainty And Data Utility Through Multi-Objective Calibration Of A Spatially Distributed Temperature And Solute Model, Christina J. Bandaragoda, Bethany T. Neilson
Increasing Parameter Certainty And Data Utility Through Multi-Objective Calibration Of A Spatially Distributed Temperature And Solute Model, Christina J. Bandaragoda, Bethany T. Neilson
Civil and Environmental Engineering Faculty Publications
To support the goal of distributed hydrologic and instream model predictions based on physical processes, we explore multi-dimensional parameterization determined by a broad set of observations. We present a systematic approach to using various data types at spatially distributed locations to decrease parameter bounds sampled within calibration algorithms that ultimately provide information regarding the extent of individual processes represented within the model structure. Through the use of a simulation matrix, parameter sets are first locally optimized by fitting the respective data at one or two locations and then the best results are selected to resolve which parameter sets perform best …
Selective Biochlorination Of Hydroxyquinolines By A Flavin-Dependent Halogenase, Fuchao Xu, Amanda Merkley, Dayu Yu, Jixun Zhan
Selective Biochlorination Of Hydroxyquinolines By A Flavin-Dependent Halogenase, Fuchao Xu, Amanda Merkley, Dayu Yu, Jixun Zhan
Biological Engineering Faculty Publications
Rdc2 is a flavin-dependent halogenase from Pochonia chlamydosporia. Through the introduction of a His6-tag to both the N- and C-termini, the isolation yield of Rdc2 from Escherichia coli using Ni-NTA affinity chromatography was increased by three-fold. In vitro reaction of Rdc2 and a flavin reductase (Fre) with seven different hydroxyquinolines revealed that 3-hydroxyquinoline (3), 5-hydroxyquinoline (5), 6-hydroxyquinoline (6), and 7-hydroxyquinoline (7) can be specifically halogenated. These products were prepared by incubating the corresponding substrates with IPTG-induced E. coli BL21(DE3)/Rdc2. They were respectively characterized as 3-hydroxy-4-chloroquinoline (3a), 5-hydroxy-6-chloroquinoline (5a), 5-chloro-6-hydroxyquinoline (6a), and 7-hydroxy-8-chloroquinoline (7a) by NMR and MS …
Earth Systems Lesson Plan: Size And Forces Of The Solar System, Getaway Special Team 2010
Earth Systems Lesson Plan: Size And Forces Of The Solar System, Getaway Special Team 2010
Education and Outreach
No abstract provided.
Elementary And Middle School Science Lesson Plan: Solid, Liquid, Gas, What Is It?, Getaway Special Team 2010
Elementary And Middle School Science Lesson Plan: Solid, Liquid, Gas, What Is It?, Getaway Special Team 2010
Education and Outreach
No abstract provided.
Physics Lesson Plan: How Far And Fast Does It Travel?, Getaway Special Team 2010
Physics Lesson Plan: How Far And Fast Does It Travel?, Getaway Special Team 2010
Education and Outreach
No abstract provided.
Year Six Annual Report: Activities, Findings And Evaluators' Reports, Ncete Faculty
Year Six Annual Report: Activities, Findings And Evaluators' Reports, Ncete Faculty
Reports to NSF
The National Center for Engineering and Technology Education (NCETE) is a collaborative network of scholars with backgrounds in technology education, engineering, and related fields. Our mission is to build capacity in technology education and to improve the understanding of the learning and teaching of high school students and teachers as they apply engineering design processes to technological problems.
Signal Processing On Waveform Data From The Eyesafe Ladar Testbed (Elt), K.D. Neilsen, Scott E. Budge, R.T. Pack
Signal Processing On Waveform Data From The Eyesafe Ladar Testbed (Elt), K.D. Neilsen, Scott E. Budge, R.T. Pack
Electrical and Computer Engineering Faculty Publications
The Eyesafe Ladar Test-bed (ELT) is a raster scanning, single-beam, energy-detection ladar with the capability of digitizing and recording the return pulse waveform at 2 GHz in the field for off-line 3D point cloud formation research in the laboratory. The ELT serves as a prime tool in understanding the behavior of ladar waveforms. Signal processing techniques have been applied to the ELT waveform in an effort to exploit the signal with respect to noise reduction, range resolution improvement, and ability to discriminate between two surfaces of similar range. This paper presents a signal processing method used on the ELT waveform. …
Follow Up Nucleate Boiling On-Flight Experiment, Andrew Fassmann
Follow Up Nucleate Boiling On-Flight Experiment, Andrew Fassmann
Presentations
No abstract provided.
Evaluation Of Alternative Formulae For Calculation Of Surface Temperature In Snowmelt Models Using Frequency Analysis Of Temperature Observations, C. H. Luce, David G. Tarboton
Evaluation Of Alternative Formulae For Calculation Of Surface Temperature In Snowmelt Models Using Frequency Analysis Of Temperature Observations, C. H. Luce, David G. Tarboton
Civil and Environmental Engineering Faculty Publications
The snow surface temperature is an important quantity in the snow energy balance, since it modulates the exchange of energy between the surface and the atmosphere as well as the conduction of energy into the snowpack. It is therefore important to correctly model snow surface temperatures in energy balance snowmelt models. This paper focuses on the relationship between snow surface temperature and conductive energy fluxes that drive the energy balance of a snowpack. Time series of snow temperature at the surface and through the snowpack were measured to examine energy conduction in a snowpack. Based on these measurements we calculated …
Smooth-Wall Boundary Conditions For Dissipation-Based Turbulence Models, W. F. Phillips, Doug F. Hunsaker, Robert E. Spall
Smooth-Wall Boundary Conditions For Dissipation-Based Turbulence Models, W. F. Phillips, Doug F. Hunsaker, Robert E. Spall
Mechanical and Aerospace Engineering Faculty Publications
It is shown that the smooth-wall boundary conditions specified for commonly used dissipation-based turbulence models are mathematically incorrect. It is demonstrated that when these traditional wall boundary conditions are used, the resulting formulations allow an infinite number of solutions. Furthermore, these solutions do not enforce energy conservation and they do not properly enforce the no-slip condition at a smooth surface. This is true for all dissipation-based turbulence models, including the k-ε, k-ω, and k-ζ models. Physically correct wall boundary conditions must force both k and its gradient to zero at a smooth wall. Enforcing these two boundary conditions on k …
Hot Water, Dry Streams: A Tale Of Two Trout, Jack R. Tuholske
Hot Water, Dry Streams: A Tale Of Two Trout, Jack R. Tuholske
All In-stream Flows Material
Norman Maclean’s timeless memoir A River Runs Through It begins with the reflection that in his household “there was no clear line between religion and fly fishing.”1 That zeal remains today; nearly 30 million Americans call themselves fishermen.2 Anglers devoted an aggregate of 517 million user-days pursuing their passion in 2006 and spent billions of dollars to support it.3 Fishing in the western United States holds a special place in fishing lore the world over and for good reason. From the great trout waters of Montana, to the salmon-laden rivers of the west coast, to the sparkling …
A Comparative Guide To The Western States' Public Trust Doctrines: Public Values, Private Rights, And The Evolution Toward An Ecological Public Trust, Robin Kundis Craig
A Comparative Guide To The Western States' Public Trust Doctrines: Public Values, Private Rights, And The Evolution Toward An Ecological Public Trust, Robin Kundis Craig
All In-stream Flows Material
In the arid West, balancing private needs for fresh water to consume against the public values-recreational, aesthetic, and ecological-served by leaving fresh water in situ has tended to favor the private use side. Evidence of this result is both massive and minor, ranging from California's multi-billion-dollar water transportation system,1 to the routine de-watering of the Colorado River so that little to no water reaches the Sea of Cortez,2 to water-related Endangered Species Act lawsuits in dozens of watersheds. 3
Turbidity Effects On Solar Radiation Attenuation And Reflection, Andrew Hobson
Turbidity Effects On Solar Radiation Attenuation And Reflection, Andrew Hobson
Browse All Undergraduate research
Limited water resources in Southern Utah with the competing interests of humans and native fishes require careful management. High instream temperatures resulting from low flows are a consideration in managing the Virgin River for two endangered fish species. Throughout these periods, fish behavior changes have been observed during those high turbidity. One hypothesis was that high turbidity decreased the amount of solar radiation in the water column due to increased reflection at the water surface resulting in reduced instream temperatures. To quantify the extent of changes in incoming energy to the river, a water tank was constructed to measure the …
Design Assessment: Consumer Reports Style, Todd R. Kelley
Design Assessment: Consumer Reports Style, Todd R. Kelley
Publications
The article analyzes a design assessment-based activity, in which students are asked to evaluate an existing technology through a Consumer Reports-style approach. According to H. Petroski, the exposure of students to several design examples is important to start learning the basic elements needed in the design process. It claims that the activity will enable students to sharpen their knowledge in several areas including identifying design constraints and criteria, training via study of open designs, and practicing engineering design methods for optimization. It suggests that these are important skills for creating the student's capacity to undertake bigger design activities.
Gravitational Effects On Thin-Wire Subcooled Nucleate Boiling Dynamics, Justin Koeln, Andrew Fassmann, Troy Munro, Rob Barnett
Gravitational Effects On Thin-Wire Subcooled Nucleate Boiling Dynamics, Justin Koeln, Andrew Fassmann, Troy Munro, Rob Barnett
Presentations
No abstract provided.
Compact Survey And Inspection Day/Night Image Sensor Suite For Small Unmanned Aircraft Systems (Eyepod), Alan Bird, Scott A. Anderson, Dale Linne Von Berg, Morgan Davidson, Niel Holt, Melvin Kruer, Michael L. Wilson
Compact Survey And Inspection Day/Night Image Sensor Suite For Small Unmanned Aircraft Systems (Eyepod), Alan Bird, Scott A. Anderson, Dale Linne Von Berg, Morgan Davidson, Niel Holt, Melvin Kruer, Michael L. Wilson
Space Dynamics Laboratory Publications
EyePod is a compact survey and inspection day/night imaging sensor suite for small unmanned aircraft systems (UAS). EyePod generates georeferenced image products in real-time from visible near infrared (VNIR) and long wave infrared (LWIR) imaging sensors and was developed under the ONR funded FEATHAR (Fusion, Exploitation, Algorithms, and Targeting for High-Altitude Reconnaissance) program. FEATHAR is being directed and executed by the Naval Research Laboratory (NRL) in conjunction with the Space Dynamics Laboratory (SDL) and FEATHAR’s goal is to develop and test new tactical sensor systems specifically designed for small manned and unmanned platforms (payload weight < 50 lbs). The EyePod suite consists of two VNIR/LWIR (day/night) gimbaled sensors that, combined, provide broad area survey and focused inspection capabilities. Each EyePod sensor pairs an HD visible EO sensor with a LWIR bolometric imager providing precision geo-referenced and fully digital EO/IR NITFS output imagery. The LWIR sensor is mounted to a patent-pending jitter-reduction stage to correct for the high-frequency motion typically found on small aircraft and unmanned systems. Details will be presented on both the wide-area and inspection EyePod sensor systems, their modes of operation, and results from recent flight demonstrations.
Gravitational Effects On Thin-Wire Subcooled Nucleate Boiling Dynamics, Justin Koeln, Andrew Fassmann, Troy Munro, Rob Barnett
Gravitational Effects On Thin-Wire Subcooled Nucleate Boiling Dynamics, Justin Koeln, Andrew Fassmann, Troy Munro, Rob Barnett
Education and Outreach
No abstract provided.
Pltw And Epics‐High: Curriculum Comparisons To Support Problem Solving In The Context Of Engineering Design, Todd Kelley, Daniel C. Brenner, John T. Pieper
Pltw And Epics‐High: Curriculum Comparisons To Support Problem Solving In The Context Of Engineering Design, Todd Kelley, Daniel C. Brenner, John T. Pieper
Reports of Center Studies
A comparative study was conducted to compare two approaches to engineering design curriculum between different schools (inter-school) and between two curricular approaches, Project Lead the Way (PLTW) and Engineering Projects in Community Service (EPIC High) (inter-curricular). The researchers collected curriculum materials, including handouts, lesson plans, guides, presentation files, design descriptions, problem statements, and support guides. The researchers conducted observations in the classrooms to collect qualitative indicators of engineering/technology reasoning, collect data on the nature of students‟ questions, how students define problems, and operate within the constraints of a design problem.
Observational studies were conducted with students participating in Project Lead …
Xperts And Novices: Differences In Their Use Of Mental Representation And Metacognition In Engineering Design, Raymond Anthony Dixon
Xperts And Novices: Differences In Their Use Of Mental Representation And Metacognition In Engineering Design, Raymond Anthony Dixon
Dissertations
Research shows that mental representation such as analogical reasoning is a fundamental cognitive tool for design problem solving (Daugherty & Mentzer, 2008; Hey, Lensey, Agogino, & Wood, 2008; Lewis, 2008). Not much is known, however, about the way students and professional engineers actively generate and change their mental representation when solving a engineering design problem. There are very few studies that show how different types of mental representations; such as metaphors, propositions, and analogies; interplay with higher order cognitive processes; such as planning, monitoring, and evaluation; as engineering designers navigate their problem and solution spaces. This empirical study investigated the …
Solar Radiative Heating Of Fiber-Optic Cables Used To Monitor Temperatures In Water, Bethany T. Neilson, Christine E. Hatch, Heng Ban, Scott W. Tyler
Solar Radiative Heating Of Fiber-Optic Cables Used To Monitor Temperatures In Water, Bethany T. Neilson, Christine E. Hatch, Heng Ban, Scott W. Tyler
Mechanical and Aerospace Engineering Faculty Publications
In recent years, applications of distributed temperature sensing (DTS) have increased in number and diversity. Because fiber-optic cables used for DTS are typically sheathed in dark UV-resistant materials, the question arises as to how shortwave solar radiation penetrating a water column influences the accuracy of absolute DTS-derived temperatures in aquatic applications. To quantify these effects, we completed a modeling effort that accounts for the effects of radiation and convection on a submersed cable to predict when solar heating may be important. Results indicate that for cables installed at shallow depths in clear, low-velocity water bodies, measurable heating of the cable …
A Case Study: Teaching Engineering Concepts In Science, David R. Stricker
A Case Study: Teaching Engineering Concepts In Science, David R. Stricker
Reports of Center Studies
This study was conducted to describe a teacher developed high school engineering course, to identify teaching strategies used in the process of delivering math and science literacy through this course, to identify challenges and constraints that occurred during its development and delivery, and to describe the strategies that were used to overcome those obstacles.
A case study was conducted using semi-structured interviews with the engineering instructor at Benilde-St. Margaret's in St. Louis Park, Minnesota. In addition, the researcher conducted classroom observations and reviewed instructional materials, teacher lesson plans, and teacher journals.
Themes that developed regarding the strategies used to deliver …
The Gas Team And Nasa (Aka Boil, Boil, Toil And Trouble), Get Away Special Team 2010
The Gas Team And Nasa (Aka Boil, Boil, Toil And Trouble), Get Away Special Team 2010
Education and Outreach
No abstract provided.
Funboe (Follow-Up Nucleate Boiling On-Flight Experiment), Getaway Special Team 2010
Funboe (Follow-Up Nucleate Boiling On-Flight Experiment), Getaway Special Team 2010
Education and Outreach
No abstract provided.
Integrating Seasonal Climate Forecasts Into Institutional Decision-Making Processes, David Watkins
Integrating Seasonal Climate Forecasts Into Institutional Decision-Making Processes, David Watkins
All ECSTATIC Materials
It is often challenging to integrate climate forecast use into actual decision-making processes, even when modeling demonstrates significant benefits from its use. Decision-making processes are guided by both formal policy frameworks, and the particular institutional structures under which decision-makers must operate. In addition, water is shared across multiple stakeholders, who are often represented by specific government or private sector agencies. These agencies face different costs depending upon the outcome of a forecast, and different preferences for risk. Depending upon the institutional and political arrangements for how decisions are made, these stakeholder interests may figure more or less strongly in water …
Engineering Professional Development Design For Secondary School Teachers: A Multiple Case Study, Jenny L. Daugherty
Engineering Professional Development Design For Secondary School Teachers: A Multiple Case Study, Jenny L. Daugherty
Publications
The effectiveness of teachers has been regarded as crucial to the success of standards-based reform (Fishman, Marx, Best, & Tal, 2003). Research, particularly within science and mathematics, has underscored the need for professional development to help teachers understand (a) subject matter, (b) learners and learning, and (c) teaching methods (Loucks-Horsley, 1999). In addition to focusing on teacher professional development, national reform efforts have also emphasized science, technology, engineering, and mathematics (STEM) education (i.e., Rising Above the Gathering Storm, NRC, 2006). While substantial work has been conducted in mathematics and science, the efforts in technology and engineering education are much less …
Optimization, An Important Stage Of Engineering Design, Todd R. Kelley
Optimization, An Important Stage Of Engineering Design, Todd R. Kelley
Publications
The presents information on optimization, an important stage of engineering design. Criteria and design constraints are used in the optimization stage of the engineering design process to allow the designer to locate the optimal solution. Before initiating a prototype work, both analysis and optimization are done in designing a product. Optimization is done to create the best design relative to a set of prioritized criteria or constraints, including maximizing factors such as productivity, strength, reliability, longevity, efficiency and utilization.
Stem Education And Leadership: A Mathematics And Science Partnership Approach, Chris Merrill, Jenny Daugherty
Stem Education And Leadership: A Mathematics And Science Partnership Approach, Chris Merrill, Jenny Daugherty
Publications
The issue of attracting more young people to choose careers in science, technology, engineering, and mathematics (STEM) has become critical for the United States. Recent studies by businesses, associations, and education have all agreed that the United States’ performance in the STEM disciplines have placed our nation in grave risk of relinquishing its competitive edge in the marketplace (e.g., Rising above the gathering storm, 2007). A Congressional Research Service (2006) report stated that, a “large majority of secondary students fail to reach proficiency in math and science, and many are taught by teachers lacking adequate subject matter knowledge” (Congressional Research …
Engineering Student Outcomes For Infusion Into Technological Literacy Programs: Grades 9-12, Craig Rhodes, Vincent Childress
Engineering Student Outcomes For Infusion Into Technological Literacy Programs: Grades 9-12, Craig Rhodes, Vincent Childress
Publications
In 2004, the National Center for Engineering and Technology Education (NCETE) secured funding from the National Science Foundation (NSF) to infuse engineering design into the schools through technology education. In order to reach this goal the researchers, in cooperation with NCETE, conducted a two phase study to identify outcomes for high-school students studying engineering. The first study (referred to as a Phase I) focused on students who intended to enter an engineering program after high school, answering the question:
What are the engineering student outcomes that prospective engineering students in grades 9 through 12 should know and be able to …
Strategies For Lidar Characterization Of Particulates From Point And Area Sources, Michael D. Wojcik, Kori D. Moore, Randy S. Martin, Jerry Hatfield
Strategies For Lidar Characterization Of Particulates From Point And Area Sources, Michael D. Wojcik, Kori D. Moore, Randy S. Martin, Jerry Hatfield
Civil and Environmental Engineering Faculty Publications
Use of ground based remote sensing technologies such as scanning lidar systems (light detection and ranging) has gained traction in characterizing ambient aerosols due to some key advantages such as wide area of regard (10 km2 ), fast response time, high spatial resolution (m) and high sensitivity. Energy Dynamics Laboratory and Utah State University, in conjunction with the USDA-ARS, has developed a three-wavelength scanning lidar system called Aglite that has been successfully deployed to characterize particle motion, concentration, and size distribution at both point and diffuse area sources in agricultural and industrial settings. A suite of massbased and size distribution …
Integration Of Remote Lidar And In-Situ Measured Data To Estimate Particulate Flux And Emission From Tillage Operations, Vladmir V. Zavyalov, Gail E. Bingham, Michael D. Wojcik, Jerry L. Hatfield, Thomas D. Wilkerson, Randy S. Martin, Christian Marchant, Kori D. Moore, Bill Bradford
Integration Of Remote Lidar And In-Situ Measured Data To Estimate Particulate Flux And Emission From Tillage Operations, Vladmir V. Zavyalov, Gail E. Bingham, Michael D. Wojcik, Jerry L. Hatfield, Thomas D. Wilkerson, Randy S. Martin, Christian Marchant, Kori D. Moore, Bill Bradford
Civil and Environmental Engineering Faculty Publications
Agriculture, through wind erosion, tillage and harvest operations, burning, diesel-powered machinery and animal production operations, is a source of particulate matter emissions. Agricultural sources vary both temporally and spatially due to daily and seasonal activities and inhomogeneous area sources. Conventional point sampling methods originally designed for regional, well mixed aerosols are challenged by the disrupted wind flow and by the small mobile source of the emission encountered in this study. Atmospheric lidar (LIght Detection And Ranging) technology provides a means to derive quantitative information of particulate spatial and temporal distribution. In situ point measurements of particulate physical and chemical properties …