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Articles 21721 - 21750 of 27416

Full-Text Articles in Engineering

Flame Jet Impingement Heat Transfer, Todd Moss, Dr. Brent Webb Sep 2013

Flame Jet Impingement Heat Transfer, Todd Moss, Dr. Brent Webb

Journal of Undergraduate Research

Impinging flame jets are used widely in industry and manufacturing because of their high heat transport characteristics and tight spatial control of the heating. The technique is used in heating or re-heating of stock in the metals and glass industries, and in welding and soldering operations. However, these impinging flame jets are not well understood, and few studies reporting local and average heat transfer characteristics exist in the open literature which might be used by designers (Baukal and Gebhart, 1995a, 199b). The purpose of this research is to experimentally characterize and correlate the local and average heat transfer behavior of …

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Heats Of Combustion For Four Utah Leaf Species, Megan M. Woodhouse, Dr. Thomas Fletcher Sep 2013

Heats Of Combustion For Four Utah Leaf Species, Megan M. Woodhouse, Dr. Thomas Fletcher

Journal of Undergraduate Research

Empirical models have been developed to predict the spread of forest fire models from data about the burning plant species, terrain, and wind conditions. Over the past three years, a research group at Brigham Young University has collected data for ignition temperatures and time to ignition for eight leaf species involved in wildland fires. Four of these species are found in the Southern California chaparral, while the four other species are found in Utah. To further improve the fire models it is desirable to know the heats of combustion for each of the different leaf species. Heats of combustion can …

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Bradford Singley, Bradfor Singley Sep 2013

Bradford Singley, Bradfor Singley

Journal of Undergraduate Research

I am writing to thank you for the generous scholarship. I cannot express my gratitude for this endowment. My wife is having a baby in three weeks, so this truly is a blessing in our lives. This scholarship will help us to make ends meet while allowing me to finish my bachelor’s degree.

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Scanning Impedance Imaging: Optimizing Frequency And Conductivity For Cancer Cell Imaging, Ben Zhang, Dr. Aaron Hawkins Sep 2013

Scanning Impedance Imaging: Optimizing Frequency And Conductivity For Cancer Cell Imaging, Ben Zhang, Dr. Aaron Hawkins

Journal of Undergraduate Research

The ability to scan individual cancer cells that are alive has always fascinated the biomedical research community. Unfortunately, modern day imaging tools, such as atomic force microscopy, electron microscopy and magnetic resonance imaging, have not been successful in achieving that goal. The Scanning Impedance Imaging (SII) project hopes to successfully scan an individual living cancer cell and provide the biomedical community with a new imaging tool.

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Design Of An Aerospike Rocket Nozzle For Integration With A Hybrid Rocket Motor, Jeffrey L. Smith, Dr. Paul F. Eastman Sep 2013

Design Of An Aerospike Rocket Nozzle For Integration With A Hybrid Rocket Motor, Jeffrey L. Smith, Dr. Paul F. Eastman

Journal of Undergraduate Research

Safe, reliable, technologies are needed to launch a new generation of astronauts and space tourists into space. The aerospike nozzle is more efficient than traditional bell shaped nozzles and is safer because of lower combustion chamber pressure. These excellent performance characteristics have never before been tested in conjunction with a hybrid rocket motor. This paper presents the design and testing method for an aerospike rocket.

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Characterization Of Variables In Electrical Killing Of Bacteria: Voltage And Current Geometry, Taylor Turner, Dr. William Pitt Sep 2013

Characterization Of Variables In Electrical Killing Of Bacteria: Voltage And Current Geometry, Taylor Turner, Dr. William Pitt

Journal of Undergraduate Research

As part of a constant pursuit of better health researchers continuously investigate the role of bacteria in disease and infection. Much research today investigates methods for effectively killing unwanted bacteria in the body. Modern antibiotic medications are the most effective method of accomplishing this, but they have their limits. One particular limit of today’s antibiotics is the ability to eliminate biofilms. Biofilms consist of many layers of bacterial cells growing on top of each other, typically attached to a solid surface. Antibiotics cannot penetrate the layers of biofilms, leaving the lower bacteria untouched after treatment. This problem led us to …

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Correlating Skin Vibration With Radiated Sound During Speech, Jason Schulthess, Dr. Scott Thomson Sep 2013

Correlating Skin Vibration With Radiated Sound During Speech, Jason Schulthess, Dr. Scott Thomson

Journal of Undergraduate Research

The intent of this research was to study correlation between the sound that is radiated during human speech and the resulting vibrations that occur in the skin in regions of the head and neck. This report includes results from two parts of this research. First are the measurement results and the comparisons of frequency content obtained from the vibration of the skin at various locations on the head and neck. The second is a presentation of the results examining the frequency content of the measurement device; this study was motivated by preliminary testing results that revealed possible interference due to …

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Design Of Compliant Prosthetic Ankle Joints Using A Kinematic Model, Jason M. Wiersdorf, Robert Robins, Spencer P. Magleby, Larry L. Howell, Robert H. Todd Sep 2013

Design Of Compliant Prosthetic Ankle Joints Using A Kinematic Model, Jason M. Wiersdorf, Robert Robins, Spencer P. Magleby, Larry L. Howell, Robert H. Todd

Journal of Undergraduate Research

The complex system of bones, muscles, ligaments and tendons in the human ankle allow it to withstand high compression impacts, to move in multiple degrees of freedom, and to transfer energy from the leg to the foot while walking or running.

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Asset Tracking System, Jacob Roberts, Dr. Joseph Ekstrom Sep 2013

Asset Tracking System, Jacob Roberts, Dr. Joseph Ekstrom

Journal of Undergraduate Research

RFID, Radio Frequency Identification, is a technology that is beginning to attract the attention of large business. These businesses have complicated and expensive supply chains. RFID promises to streamline asset tracking and reduce supply chain costs.

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Student Digital Portfolio Analysis And Implementation For Byu Students, Keith Kasperson, Dr. Gordon W. Romney Sep 2013

Student Digital Portfolio Analysis And Implementation For Byu Students, Keith Kasperson, Dr. Gordon W. Romney

Journal of Undergraduate Research

The Student Digital Portfolio (StuDigiPort) capstone team shall provide a web application that provides students with a digital or electronic portfolio. A digital portfolio is a collection of student work that is organized similar to a hard copy portfolio. The purpose of the portfolio is to demonstrate the character and abilities of the student. Following are some of the requested features that shall be provided by the Student Digital Portfolio application:

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Xmdf To Gis, Eric Jones, Dr. Jim Nelson Sep 2013

Xmdf To Gis, Eric Jones, Dr. Jim Nelson

Journal of Undergraduate Research

My project is to convert the file system of the program WMS (Watershed Modeling System) from an ASCII text file format to an updated HDF5, or XMDF file format.

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Evaluation Of Three Chemical Coatings On Biomaterial Induced Thromboembolism, Joseph Flinders, Dr. Kenneth Solen Sep 2013

Evaluation Of Three Chemical Coatings On Biomaterial Induced Thromboembolism, Joseph Flinders, Dr. Kenneth Solen

Journal of Undergraduate Research

When blood contacts man-made biomaterials such as those used in artificial organs (e.g. hemodialyzers, oxygenators, etc.) a chain of events occurs that can lead to medical complications as serious as a stroke. These events include proteins (particularly fibrinogen) adhering to the biomaterial’s surface, the accumulation of blood platelets on the fibrinogen to form “Thrombi”, and then the dislodging of the thrombi to form particles (microemboli) that can block downstream arteries or capillaries causing a “stroke” or other cardiovascular event.

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Antibody-Conjugated Polymeric Micelles That Attach To Specific Cancer Cells, Douglas S. Lewis, Dr. William G. Pitt Sep 2013

Antibody-Conjugated Polymeric Micelles That Attach To Specific Cancer Cells, Douglas S. Lewis, Dr. William G. Pitt

Journal of Undergraduate Research

In the past decade, many efforts have been made to improve chemotherapeutic treatments for cancer patients. One of the specific efforts seeks to actively deliver anti-cancer drugs to the target tissue rendering the chemotherapy more efficient and less damaging to nearby uninfected cells.

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Using Computer Simulation To Overcome Shortcomings In Laboratory Relative Density Tests For Soils, Amy L. Cook, Dr. Travis Gerber Sep 2013

Using Computer Simulation To Overcome Shortcomings In Laboratory Relative Density Tests For Soils, Amy L. Cook, Dr. Travis Gerber

Journal of Undergraduate Research

An important soil parameter in geotechnical engineering is relative density. Relative density is a measure of the compactness of a cohesionless soil when compared to the loosest and densest state of the soil.

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Preliminary Liquefaction Hazard Analysis For Bridge Sites Along The 1-15 Corridor Salt Lake County, Utah, Samuel Gilstrap, Dr. T. Leslie Youd Sep 2013

Preliminary Liquefaction Hazard Analysis For Bridge Sites Along The 1-15 Corridor Salt Lake County, Utah, Samuel Gilstrap, Dr. T. Leslie Youd

Journal of Undergraduate Research

The term liquefaction refers to the loss of strength in soils during earthquake shaking. Generally, liquefaction occurs in loose sandy soils which lie beneath the water table. Liquefaction-induced ground failures have been major causes of bridge damage during past earthquakes. My research was to apply state-of-the-art methods for evaluating liquefaction hazard to the bridge sites along the 1-15 corridor in Salt Lake County, Utah. This section of interstate is to be reconstructed over the next 4 years and is one of the largest construction projects ever initiated in Utah. This segment of the highway lies generally parallel to the Salt …

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Air/Polymer Diffraction Grating Coupler, Josh Kvavle Sep 2013

Air/Polymer Diffraction Grating Coupler, Josh Kvavle

Journal of Undergraduate Research

The purpose of my research was to fabricate air/dielectric interface diffraction grating couplers. This report will explain the obstacles that I encountered, and the resulting direction that my research took. In summary, soon after I began my research, a very expensive laser that I depended on for this research was sent away for repairs, so I began doing characterization of a polymer.

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Coarsening Algorithm For Tetrahedral Meshes, Eve S. Crow, Dr. Steven Benzley Sep 2013

Coarsening Algorithm For Tetrahedral Meshes, Eve S. Crow, Dr. Steven Benzley

Journal of Undergraduate Research

In Finite Element Analysis (FEA), there are often times when the mesh on the model needs to be more dense or less dense in a certain region. Refinement and coarsening are the tools used to achieve the desired density of a mesh. The CUBIT toolkit has a coarsening algorithm for triangle surface meshes, but the algorithm for coarsening tetrahedral meshes has not been implemented. I have done some research and have a plan for how it could be implemented.

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A Coordinated Sensing Algorithm For An Ad-Hoc Sensing Network, Britton Quist, Dr. Lee Swindlehurst Sep 2013

A Coordinated Sensing Algorithm For An Ad-Hoc Sensing Network, Britton Quist, Dr. Lee Swindlehurst

Journal of Undergraduate Research

Sensor deployment and placement has a myriad of applications. In everything from wildlife monitoring to underwater microphone surveillance to UAV (unmanned air vehicle) battlefield surveillance the placement of sensors is essential for proper coverage. Often these devices (nodes) communicate as an Ad-Hoc network where data sent to a distant sensor or node will be conveyed across the network by the nodes along the way. In this way, if a node is within the communication range of a single node with other connections, it can communicate with an entire network. This approach is an alternative to the network used in applications …

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High-Speed Tunable Mems Filter, Seth Lloyd, Dr. Richard Selfridge Sep 2013

High-Speed Tunable Mems Filter, Seth Lloyd, Dr. Richard Selfridge

Journal of Undergraduate Research

Optical fiber sensors offer a viable alternative to traditional electronic sensors because of their small size and high immunity to environmental phenomena. While many researchers focus on developing and applying new optical sensing technologies, there is also a great need for better fiber sensor interrogators. An interrogator is the system used to collect the data from the sensor, which with optical sensors usually involves the transfer of an optical signal to an electric signal. The current equipment required for interrogating fiber optic sensors tends to be large, bulky and costly, has high power consumption, and usually performs only the most …

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Cancer Cell Research, Jacey C. Morine, Dr. Aaron Hawkins Sep 2013

Cancer Cell Research, Jacey C. Morine, Dr. Aaron Hawkins

Journal of Undergraduate Research

Cancer cell research is an exciting field of study that has involved a variety of disciplines. In my area of research, I was involved on the electrical engineering side of cancer cell research. We used a small scanning probe that was able to image small objects based on the changes in measured voltage. Eventually, we should be able to image individual cells as we make these tips smaller and smaller.

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Fabrication And Characterization Of Electroosmotic Pumps For Protein Separation And Integration Into Arrow Structure, Donald B. Conkey, Dr. Aaron R. Hawkins Sep 2013

Fabrication And Characterization Of Electroosmotic Pumps For Protein Separation And Integration Into Arrow Structure, Donald B. Conkey, Dr. Aaron R. Hawkins

Journal of Undergraduate Research

Electroosmotic pumps have been fabricated and tested made with a thin-film deposition process compatible with standard silicon processing. This methodology relies upon chemical vapor deposition and chemical sacrificial etching to form long hollow fluid channels. Fabricating pumps in this way is attractive because they can be made on a variety of substrates with high-scale integration and can conveniently be combined with other planar thin-film components. These pumps have significantly smaller core diameters and separation between micropump channels than pumps made with alternative fabrication techniques. Flow rates were measured on these devices for different applied voltages.

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Use Of Signal Processing Methods To Improve Speech Intelligibility In Throat Microphones, Daniel J. Andelin, Dr. Scott Thomson Sep 2013

Use Of Signal Processing Methods To Improve Speech Intelligibility In Throat Microphones, Daniel J. Andelin, Dr. Scott Thomson

Journal of Undergraduate Research

Effective communication, vital to successful operations in many sectors, including military, business, and industry, depends largely on the receiver’s ability to accurately interpret the transmitted signal, generally referred to as speech intelligibility (SI). The presence of elevated noise can be seriously detrimental to SI. To reduce ambient noise in communication through audio microphones, it is possible to use a throat microphone (TM), which senses vocal fold vibrations through the skin on the speaker’s neck, as opposed to detecting the airborne sound wave emanating from the speaker’s mouth, as in standard microphones . Unfortunately, the position of the TM on the …

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Hypothermia-Induced Platelet Aggregation And Fibrinogen Functionality, Adam Broderick, Dr. Ken Solen Sep 2013

Hypothermia-Induced Platelet Aggregation And Fibrinogen Functionality, Adam Broderick, Dr. Ken Solen

Journal of Undergraduate Research

Hypothermia-Induced Platelet Aggregation (HIPA) may pose a significant risk for patients undergoing some surgical procedures. During heart surgery, a patient’s core temperature is typically lowered to reduce tissue damage. Hall et al. (2002) observed that this caused blood platelet aggregation in ~30% of test subjects1 and increases post-operative neurological impairment after hypothermic coronary bypass surgery, possibly through occlusion of small blood vessels by platelet aggregates.2

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Quantifying The Relationship Between Platelet Activity And Blood-Materials Interactions, Kenneth Solen Sep 2013

Quantifying The Relationship Between Platelet Activity And Blood-Materials Interactions, Kenneth Solen

Journal of Undergraduate Research

In clinical practice, variations among patients in the degree of blood-material interaction are evidenced in the fact that physicians have long sought for ways to provide patient-specific treatment1. No clinical screening yet exists to test the level of interaction expected from a given patient. My research attempted to test the hypothesis that a correlation exists between platelet function and blood-material interaction.

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Parametric Investigation Of The Isotruss® Panel, Gregory J. Larson Sep 2013

Parametric Investigation Of The Isotruss® Panel, Gregory J. Larson

Journal of Undergraduate Research

The IsoTruss Panel is a three dimensional composite grid structure, evolving from the IsoTruss®. The IsoTruss® implements a revolutionary idea of utilizing the very strong unidirectional characteristics in composite materials in a three dimensional manner. The IsoTruss® is utilized in pole-type applications. The IsoTruss Panel is based on similar principles but is designed for use in plate and wall type structures as well as curved applications.

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Synthetic Model Of Vocal Folds, Todd C. Groesbeck, Dr. Scott Thomson Sep 2013

Synthetic Model Of Vocal Folds, Todd C. Groesbeck, Dr. Scott Thomson

Journal of Undergraduate Research

The influence and treatment of human vocal fold scarring is a topic of great interest to the speech community (clinicians, surgeons, educators, etc). Understanding how voice production occurs “is sought in order to improve predictive, diagnostic, and corrective practices related to vocal fold health” . When a patient undergoes vocal fold surgery, scarring frequently occurs. The same surgery intended to heal the vocal fold thus leaves it damaged; scarring results in impaired vibration and prevents the individual from normal, healthy voice use.

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Terrain Following In Unmanned Air Vehicles Using Optic Flow Sensors, Blake Barber, Dr. Tim Mclain Sep 2013

Terrain Following In Unmanned Air Vehicles Using Optic Flow Sensors, Blake Barber, Dr. Tim Mclain

Journal of Undergraduate Research

A key enabling technology that will allow the U.S. Military to maintain information superiority in the 21st century is the development and implementation of Unmanned Air Vehicle (UAV) technology. Especially critical to the support of the small special operations units conducting the asymmetric warfare of the 21st century will be the development of mini and micro UAV technology. Mini and micro UAV technology will enable foot soldiers to hand launch and recover small, robust reconnaissance aircraft capable of providing real-time video surveillance and real-time target acquisition. These capabilities will allow soldiers to have the full situational awareness they need for …

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Frequency Response Of Skin Vibration On The Head And Neck During Speech, Ben Pence, Dr. Scott Thomson Sep 2013

Frequency Response Of Skin Vibration On The Head And Neck During Speech, Ben Pence, Dr. Scott Thomson

Journal of Undergraduate Research

During speech, the vocal folds vibrate resulting in audible sounds. In addition to being transmitted through the vocal tract these vibrations are also transmitted through several layers of various types of tissue throughout the head and neck, resulting in small, but measurable, skin surface vibration. Contact microphones sense these skin surface vibrations for speech transmission as opposed to acoustic microphones that sense air vibrations that radiate from the mouth.

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Design Of Compliant Bicycle Brake, Todd R. Coon, Dr. Larry Howell Sep 2013

Design Of Compliant Bicycle Brake, Todd R. Coon, Dr. Larry Howell

Journal of Undergraduate Research

Shimano corporation, the market leader in bicycle components, sells a class of brakes titled “Vbraketm” that has a strong braking force and travels in a horizontal motion. The V-brake (Fig. 1) uses a four-bar mechanism to direct its motion. The goal of this design project was to use new technology to achieve the same performance as the V-brake while significantly decreasing the part count and the complexity of the design.

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Ds3 Web Interface, Kevin Wong, Dr. Gordon Romney Sep 2013

Ds3 Web Interface, Kevin Wong, Dr. Gordon Romney

Journal of Undergraduate Research

As digital media storage is growing ever more popular, security of this data is becoming more and more important. Intruders can relatively easily alter digital files and documents. Several customers, such as the Harold B. Lee Library, the archivist of the Dead Sea Scrolls, and the Director of the Center for Earth Remote Sensing, need the assurance of data integrity, as the users of these files require unaltered content. A digital signature signing server can receive a digital file, digitally sign it, and store the digital signature with the original file. When needed, the server can regenerate the signature and …

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