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2014

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Articles 4591 - 4620 of 7242

Full-Text Articles in Engineering

Systems Integration Of The Goldhelox X-Ray Telescope, Paul F. Eastman, Dr. Thomas J. Utley Jr. Feb 2014

Systems Integration Of The Goldhelox X-Ray Telescope, Paul F. Eastman, Dr. Thomas J. Utley Jr.

Journal of Undergraduate Research

The GoldHelox X-Ray Telescope is an undergraduate project of the Brigham Young University Physics Department in conjunction with the National Aeronautics and Space Administration. It is a fully autonomous robotic telescope and camera system capable of converting x-rays in the range of 171 angstroms into visible light and capturing the source images on 35mm film. This particular wavelength corresponds to the frequency of x-rays emitted by solar flares erupting from the surface of the sun, and by imaging only the x-rays emitted by the flares themselves, the effect will be to strip away much of the rest of the solar …

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Exploring Demand Flexibility In Heterogeneous Aggregators: An Lmp-Based Pricing Scheme, Chenye Wu, Yiyu Shi, Soummya Kar Feb 2014

Exploring Demand Flexibility In Heterogeneous Aggregators: An Lmp-Based Pricing Scheme, Chenye Wu, Yiyu Shi, Soummya Kar

Electrical and Computer Engineering Faculty Research & Creative Works

With the proposed penetration of electric vehicles and advanced metering technology, the demand side is foreseen to play a major role in flexible energy consumption scheduling. On the other hand, the past several years has witnessed utility companies' growing interests to integrate more renewable energy resources. These renewable resources, for example, wind or solar, due to their intermittent nature, brought great uncertainty to the power grid system. In this article, we propose a mechanism that attempts to mitigate the grid operational uncertainty induced by renewable energies by properly exploiting demand flexibility with the help of advanced smart-metering technology. To address …

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Comm-Link Equations - Loose Slides, Robert J. Twiggs Feb 2014

Comm-Link Equations - Loose Slides, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "Comm-Link Equations" from February 13, 2014.

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Computer Data Busses, Robert J. Twiggs Feb 2014

Computer Data Busses, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "Computer Data Busses" from February 13, 2014.

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Considerations In The Design Of A Prosthetic Foot Using Compliant Design And Analysis Techniques, Kenneth E. Richardson Feb 2014

Considerations In The Design Of A Prosthetic Foot Using Compliant Design And Analysis Techniques, Kenneth E. Richardson

Journal of Undergraduate Research

The modeling of the human body is not an easy task. Designers of artificial organs and prosthetic devices have the unenviable goal of attempting to duplicate (or at least satisfactorily approximate) the motion and function of the greatest and most powerful machine on the face of the earth. Any new tool that could be used in such design would be valuable and useful. Compliant mechanism theory and design is one such tool.

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Limitations Of One-Dimensional Surface Water Models, Todd J. Strong, Dr. Alan K. Zundel Feb 2014

Limitations Of One-Dimensional Surface Water Models, Todd J. Strong, Dr. Alan K. Zundel

Journal of Undergraduate Research

Using the Surface Water Modeling System (SMS), models were generated to reflect the situation of bridge abutments being placed in the flow path of a river. Two types of models were generated, a one-dimensional (1D) model and a two-dimensional (2D) mesh. To analyze the models, the 1D program WSPRO and the 2D program FESWMS were used. The 2D models contain more properties of the system, allowing them to be much more characteristic of the actual river, and provide more accurate results. However, 2D models take much more time to generate, edit and analyze. In our tests, the average time to …

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Multinode Acoustic Systems For High Throughput Cellular Analysis, Pearlson Prashanth Austin Suthanthiraraj Feb 2014

Multinode Acoustic Systems For High Throughput Cellular Analysis, Pearlson Prashanth Austin Suthanthiraraj

Chemical and Biological Engineering ETDs

For decades, flow cytometry is used as the gold standard for cellular analyses as it measures multiple properties of single cells. Traditional flow cytometry uses the hydrodynamic focusing technique where the sheath fluid focuses cells in the sample into a narrow stream. Although such precise focusing provides accurate optical measurements, high sheath fluid pressure and high linear velocities limit analysis rate to 50,000 particles/s. Such rates are too low for detecting rare events where one cell may have to be detected in a population of about a billion cells. Therefore, it is necessary to eliminate the sheath fluid and improve …

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The Stochastic Capacity Of A Roadway: Is It The Answer For Better “Real-Time” Management Of Freeway Operations?, Mandar Khanal Feb 2014

The Stochastic Capacity Of A Roadway: Is It The Answer For Better “Real-Time” Management Of Freeway Operations?, Mandar Khanal

Civil Engineering Faculty Publications and Presentations

Rapid growth in vehicles has been observed in many developing countries in recent years. The number of vehicles has grown but non-motorized vehicles have not disappeared. The presence of dissimilar modes of travel results in unsafe roads. Additional factors that exacerbate the traffic problem in these countries are the tendency of users to not observe traffic rules and the lax enforcement of traffic rules by law enforcement agencies. The combination of these factors can be deadly for road users. For example in India, a total of 134,513 people lost their lives to road accidents in 2010 compared to 32,885 road …

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Cheating Death, Combat Air Rescues In Vietnam And Laos, George Marrett Feb 2014

Cheating Death, Combat Air Rescues In Vietnam And Laos, George Marrett

ERAU Prescott Aviation History Program

Hear the exciting story of George Marrett’s year as a “Sandy” rescue pilot with the 602d Fighter Squadron in 1968-69. Flying from Thailand they helped rescue downed USAF & USN pilots in Laos and Vietnam. He flew the WW II vintage Douglas A-1 Skyraider and completed 188 combat missions ; 600 combat hours. Flying low and slow, at treetop level, in all weather, it was truly hazardous duty every day!

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Educational Software For Toddler-Age Children Castle: Computer Aided Steps To Learning, Scott D. Frel, Benjamin W. Holladay Feb 2014

Educational Software For Toddler-Age Children Castle: Computer Aided Steps To Learning, Scott D. Frel, Benjamin W. Holladay

Journal of Undergraduate Research

CAStLe was developed during the Spring of 1995. The primary purose of the project was to complete the requirements for the mandatory senior project all Electrical and Computer Engineering majors must complete. With the support provided by the Office of Research and Creative Activities, this project was enhanced with sound, graphics and a friendly user interface using some of the best product development tools available to date.

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Evaluation Of The Tendency Of Biomaterials To Produce Microemboli, Jesse Hamilton Feb 2014

Evaluation Of The Tendency Of Biomaterials To Produce Microemboli, Jesse Hamilton

Journal of Undergraduate Research

Many people in today’s society depend on devices that contact their blood. Devices such as dialyzers and blood oxygenators are used every day in hemodialysis or coronary bypass. More permanent fixtures are also used such as artificial kidneys and hearts. These devices are wonderful and have contributed to longer and fuller lives for many people. However, man’s attempt to simulate the functions of the human body are simple at best, and there are serious problems that arise. These problems are tolerated by the medical profession at present because (1) they are not completely understood, and (2) the risks posed by …

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An Injectable, Calcium Responsive Composite Hydrogel For The Treatment Of Acute Spinal Cord Injury, Christopher A. Mckay, Rebecca D. Pomrenke, Joshua S. Mclane, Nicholas J. Schaub, Elise K. Desimone, Lee A. Ligon, Ryan J. Gilbert Feb 2014

An Injectable, Calcium Responsive Composite Hydrogel For The Treatment Of Acute Spinal Cord Injury, Christopher A. Mckay, Rebecca D. Pomrenke, Joshua S. Mclane, Nicholas J. Schaub, Elise K. Desimone, Lee A. Ligon, Ryan J. Gilbert

Chemical and Biochemical Engineering Faculty Research & Creative Works

Immediately following spinal cord injury, further injury can occur through several secondary injury cascades. As a consequence of cell lysis, an increase in extracellular Ca2+ results in additional neuronal loss by inducing apoptosis. Thus, hydrogels that reduce extracellular Ca2+ concentration may reduce secondary injury severity. The goal of this study was to develop composite hydrogels consisting of alginate, chitosan, and genipin that interact with extracellular Ca2+ to enable in situ gelation while maintaining an elastic modulus similar to native spinal cord (∼1000 Pa). It was hypothesized that incorporation of genipin and chitosan would regulate hydrogel electrostatic characteristics …

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In-Package Nonthermal Plasma Degradation Of Pesticides On Fresh Produce, N. Misra, Shashi Pankaj, Tony Walsh, Finbarr O'Regan, Paula Bourke, Patrick J. Cullen Feb 2014

In-Package Nonthermal Plasma Degradation Of Pesticides On Fresh Produce, N. Misra, Shashi Pankaj, Tony Walsh, Finbarr O'Regan, Paula Bourke, Patrick J. Cullen

Articles

In-package nonthermal plasma (NTP) technology is a novel technology for the decontamination of foods and biological materials. This study presents the first report on the potential of the technology for the degradation of pesticide residues. A cocktail of pesticides, namely Azoxystrobin, Cyprodinil, Fludioxonil and Pyriproxyfen was tested on strawberries. The concentrations of these pesticides were monitored in priori and post- plasma treatment using GC-MS/MS. An applied voltage and time dependent degradation of the pesticides was observed for treatment voltages of 60, 70 and 80 kV and treatment durations ranging from 1 to 5 min, followed by 24 h in-pack storage. …

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Plant Translocation Of Organic Compounds: Molecular And Physicochemical Predictors, Matt A. Limmer, Joel Gerard Burken Feb 2014

Plant Translocation Of Organic Compounds: Molecular And Physicochemical Predictors, Matt A. Limmer, Joel Gerard Burken

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Root-Soil Boundary Represents One of the Largest Global Biotic-Abiotic Mass-Transfer Interfaces and is a Primary Pollutant Entry Point to the Food Chain. This Interface is Also Critically Important in Phytoremediation Efforts and Herbicide Design. Experimental Data and Single-Parameter Models Have Resulted in the Current Understanding that Moderately Hydrophobic Organic Compounds Are Most Likely to Be Translocated by Plants, Although Recent Evidence Indicates Plants Can Also Translocate Some Hydrophilic Compounds. Molecular Descriptors Initially Applied for Drug Discovery and for Transmembrane Migration in Mammalian Systems Were Applied Here to Determine the Physicochemical Domains and Weighted Desirability Functions to Identify Compounds Amenable …

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Computer Simulation Of Synthetic Aperture Radar, Adam Robertson, Dr. David V. Arnold Feb 2014

Computer Simulation Of Synthetic Aperture Radar, Adam Robertson, Dr. David V. Arnold

Journal of Undergraduate Research

The Microwave Earth Remote Sensing group in the BYU Department of Electrical Engineering has developed several Synthetic Aperture Radars (SAR). SARs transmit many short bursts of energy from a satellite or airplane. The bursts of energy are reflected by whatever is in their path. Some of the reflected signals return to the same place that they were transmitted from and are sampled by the radar system. Materials reflect the pulses differently depending on their roughness and their electromagnetic properties, similar to how light bouncing off an object may be bright or dull, blue or red. The received pulses are processed …

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Complexation Reactions And Structure Of The Iron-Molybdenum Cofactor Of Nitrogenase, Dean Wheeler Feb 2014

Complexation Reactions And Structure Of The Iron-Molybdenum Cofactor Of Nitrogenase, Dean Wheeler

Journal of Undergraduate Research

As described in the proposal submitted last year for this project, there is a great need to further understand the dynamics and processes of the nitrogenase system. Using this chemical system a limited number of microorganisms are able to break down atmospheric nitrogen so it may be used by other organisms. The heart of the matter-where the reduction of nitrogen takes place-is a small cluster of atoms located inside the dinitrogenase protein. This cluster is known as the iron-molybdenum cofactor or FeMoco.

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Methane Recovery At Springville Wastewater, Rochelle Phillips, Dr. William Hecker, Dr. Vincent Wilding Feb 2014

Methane Recovery At Springville Wastewater, Rochelle Phillips, Dr. William Hecker, Dr. Vincent Wilding

Journal of Undergraduate Research

During the treatment of municipal wastewater, several means are used to accomplish the breakdown of the wastewater and its solid components into innocuous substances. At one point, the filtered solids are combined in a digester with various bacteria. These bacteria convert the waste into carbon dioxide, methane gas, water, and small amounts of hydrogen sulfide.

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Commincations - Deicibel, Robert J. Twiggs Feb 2014

Commincations - Deicibel, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs on "Comminications - Decibel" from February 11, 2014.

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Communications - Decibel, Robert J. Twiggs Feb 2014

Communications - Decibel, Robert J. Twiggs

Robert "Bob" Twiggs STEM Education Collection

A PowerPoint Presentation created by Professor Bob Twiggs titled "Communications - Decibel" from February 11, 2014.

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Anti-Icing Coatings And Methods, Russell G. Alger Feb 2014

Anti-Icing Coatings And Methods, Russell G. Alger

Michigan Tech Patents

A method of inhibiting or preventing bonding between snow or ice and a substrate. The method includes applying an adhesive to the substrate, broadcasting an aggregate onto the adhesive, the aggregate having the capacity to receive an anti-icing chemical into the aggregate, and applying the antiicing chemical onto the aggregate so that at least a portion of the anti-icing chemical is received into at least a portion of the aggregate.

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Development Of Tailsitter Hover Estimation And Control, Jason M. Beach Feb 2014

Development Of Tailsitter Hover Estimation And Control, Jason M. Beach

Theses and Dissertations

UAVs have become an essential tool in many market segments, particularly the military where critical intelligence can be gathered by them. A tailsitter aircraft is a platform whose purpose is to efficiently merge the range and endurance of fixed-wing aircraft with the VTOL capabilities of rotorcraft and is of significant value in applications where launch and recovery area is limited or the use of launch and recovery equipment is not desirable. Developing autopilot software for a tailsitter UAV is unique in that the aircraft must be autonomously controlled over a much wider range of attitudes than conventional UAVs. Assumptions made …

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The Origin Of Interferometric Effect Involving Surface Plasmon Polariton In Scattering Near-Field Scanning Optical Microscopy, Yan Li, Nan Zhou, Edward C. Kinzel, Xifeng Ren, Xianfan Xu Feb 2014

The Origin Of Interferometric Effect Involving Surface Plasmon Polariton In Scattering Near-Field Scanning Optical Microscopy, Yan Li, Nan Zhou, Edward C. Kinzel, Xifeng Ren, Xianfan Xu

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Scattering near-field scanning optical microscopy (s-NSOM) has been developed to characterize optical near field with spatial resolution on the order of 10 nm. In this work we report investigation of the interferometric patterns commonly occurred in s-NSOM measurements. To reveal the origin of such interference patterns, a simple nano slit is used. Comparing the measured result with a simplified analytical model as well as full-field numerical simulations, it is shown that the interference pattern is predominantly formed by the in-plane component of incidence light and surface plasmon polariton (SPP) launched by the nano slit. This result helps to understand the …

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The Effects Of Winglets At Low Speeds, Brian Johansen Feb 2014

The Effects Of Winglets At Low Speeds, Brian Johansen

Journal of Undergraduate Research

The purpose of an airplane wing is to provide lift by creating a pressure gradient between the top and bottom of the wing. However, this pressure gradient causes some inherent problems at the wing tip. A vortex forms when the high pressure from the bottom side of the wing flows around the wig tip to the top side of the wing. This vortex is detrimental not only to the lift that the wing can produce but to the fuel efficiency of the airplane.

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Building Software Radios Using Fpgas, Preston A. Jackson, Dr. Brad L. Hutchings Feb 2014

Building Software Radios Using Fpgas, Preston A. Jackson, Dr. Brad L. Hutchings

Journal of Undergraduate Research

The ability to implement a commercial AM and FM radio receiver on a field programmable gate array (FPGA) has only recently become possible. FPGAs, the bottleneck technology, have made recent gains is speed and size that allow a signal demodulator to be designed completely in software. As shown below, two additional conversion systems are needed beyond the software demodulator, namely the analog to digital conversion system and the digital to analog conversion system.

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The Role Of Grain Boundary Misorientation In Intergranular Cracking Of Copper, John W. Bean Feb 2014

The Role Of Grain Boundary Misorientation In Intergranular Cracking Of Copper, John W. Bean

Journal of Undergraduate Research

This report will summarize the efforts and results of the research conducted by John Bean on the role of grain boundary misorientations in intergranular cracking of copper-based metals. This research was conducted during the period of Sept. 1993 toApril1994. I was not able to prove all that I had originally proposed to do because of certain difficulties I will explain below. My research was ended when the equipment I was using was moved at the end of the 1994 winter semester. This report will briefly describe the purpose of my research and the difficulties that I encountered.

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Catalytic Hydrogen Transfer Of Ketones Over Atomic Layer Deposited Highly-Dispersed Platinum Nanoparticles Supported On Multi-Walled Carbon Nanotubes, Chengjun Jiang, Xinhua Liang Feb 2014

Catalytic Hydrogen Transfer Of Ketones Over Atomic Layer Deposited Highly-Dispersed Platinum Nanoparticles Supported On Multi-Walled Carbon Nanotubes, Chengjun Jiang, Xinhua Liang

Chemical and Biochemical Engineering Faculty Research & Creative Works

Hydrogen transfer of ketones, catalyzed by highly dispersed platinum nanoparticles supported on multi-walled carbon nanotubes (MWCNTs), was studied. Pt nanoparticles were deposited on gram quantities of non-functionalized MWCNTs by atomic layer deposition (ALD) at 300 C, using (methylcyclopentadienyl) trimethylplatinum and oxygen as precursors. TEM analysis showed that ~ 1.4 nm Pt nanoparticles were highly dispersed on MWCNTs. The heterogeneous hydrogen-transfer reactions of acetophenone indicated that an acetophenone conversion of 100% and a 1-phenylethanol selectivity of 99.0% could be obtained with a ketone to Pt mass ratio of 24,690 and a ketone to KOH mass ratio of 22 at 150 C …

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Thermophile Biochemistry, Charles Larsen Feb 2014

Thermophile Biochemistry, Charles Larsen

Journal of Undergraduate Research

During the 1960s, Dr. Thomas Brock studied life in the hot springs of Yellowstone National Park. There he found new strains of bacteria capable of living at temperatures above 75°C, which at the time represented the highest temperature at which life was known to exist. Dr. Brock’s discovery has sparked a world wide research effort to understand thermophilic bacteria, both their biochemistry and industrial applicability.

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Project Summary For The Wireless Heartbeat Monitor, Brad Beinholt Feb 2014

Project Summary For The Wireless Heartbeat Monitor, Brad Beinholt

Journal of Undergraduate Research

Thank you for your support of the Wireless Heartbeat Monitor project. This has been an exciting project that has given me experience in wireless communications and in medical instrumentation. It has introduced me to microprocessor control and given me training in project planning and followthrough. The Wireless Heartbeat Monitor senses a person’s heartbeat by passing light through the individual’s finger or earlobe. Blood circulating though the body, moving in pulses as the heart and the muscles surrounding the veins and arteries contract, filters this light. Creating a varying electrical signal, a photo resistor senses the slight fluctuations in light leaving …

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Nanosensor Data Processor In Quantum-Dot Cellular Automata, Fenghui Yao, Mohamed Saleh Zein-Sabatto, Guifeng Shao, Mohammad Bodruzzaman, Mohan Malkani Feb 2014

Nanosensor Data Processor In Quantum-Dot Cellular Automata, Fenghui Yao, Mohamed Saleh Zein-Sabatto, Guifeng Shao, Mohammad Bodruzzaman, Mohan Malkani

Computer Science Faculty Research

Quantum-dot cellular automata (QCA) is an attractive nanotechnology with the potential alterative to CMOS technology. QCA provides an interesting paradigm for faster speed, smaller size, and lower power consumption in comparison to transistor-based technology, in both communication and computation. This paper describes the design of a 4-bit multifunction nanosensor data processor (NSDP). The functions of NSDP contain (i) sending the preprocessed raw data to high-level processor, (ii) counting the number of the active majority gates, and (iii) generating the approximate sigmoid function. The whole system is designed and simulated with several different input data.

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Ireland's Residential Rental Market Needs A Massive Shake-Up, Lorcan Sirr, Tom Dunne Feb 2014

Ireland's Residential Rental Market Needs A Massive Shake-Up, Lorcan Sirr, Tom Dunne

Media

No abstract provided.

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