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Articles 21661 - 21690 of 27416

Full-Text Articles in Engineering

Cad Tools For Thermal Growth Research, C. Porter Bassett, Dr. C. Greg Jensen Nov 2013

Cad Tools For Thermal Growth Research, C. Porter Bassett, Dr. C. Greg Jensen

Journal of Undergraduate Research

For my project I developed two tools to aid in manufacturing research that is currently being conducted in the Mechanical Engineering Department. This research is about milling, a type of manufacturing where metal is machined bye a spinning cutting tool, very similar to a drill bit, that cuts away the metal. This process generates a lot of heat and causes the cutting tool to heat up. When it heats up, it also expands and changes shape. The change in size of the cutting tool effects how much metal it removes. In precision work, this change in shape can be enough …

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Strain In Polysilicon Microbeams: The Relationship Between Beam Geometry And The Nominal Strain At Failure, Susan Norma, Candland Bromley, Dr. Larry L. Howell Nov 2013

Strain In Polysilicon Microbeams: The Relationship Between Beam Geometry And The Nominal Strain At Failure, Susan Norma, Candland Bromley, Dr. Larry L. Howell

Journal of Undergraduate Research

The objective of this research was to investigate the stress and strain behavior of microscopic cantilevered polycrystallin silicon (polysilicon) beams. A knowledge of this behavior is necessary to accomplish reliable mechanical design of micro-electro-mechanical systems (MEMS).

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Bs News November/December Nov 2013

Bs News November/December

Building Services Engineering

No abstract provided.

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The Humanistic Side Of Engineering: Considering Social Science And Humanities Dimensions Of Engineering In Education And Research, Morgan Hynes, Jessica Swenson Oct 2013

The Humanistic Side Of Engineering: Considering Social Science And Humanities Dimensions Of Engineering In Education And Research, Morgan Hynes, Jessica Swenson

Journal of Pre-College Engineering Education Research (J-PEER)

Mathematics and science knowledge/skills are most commonly associated with engineering’s pre-requisite knowledge. Our goals in this paper are to argue for a more systematic inclusion of social science and humanities knowledge in the introduction of engineering to K-12 students. As part of this argument, we present a construct for framing the humanistic side of engineering with illustrative examples of what appealing to the humanistic side of engineering can look like in a classroom setting, and opportunities for research that examines the dynamics the humanistic side of engineering introduces into engineering learning and teaching. The illustrative examples are drawn from interactions …

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Secondary Students' Conceptual Understanding Of Engineering As A Field, Devlin B. Montfort, Shane Brown, Victoria Whritenour Oct 2013

Secondary Students' Conceptual Understanding Of Engineering As A Field, Devlin B. Montfort, Shane Brown, Victoria Whritenour

Journal of Pre-College Engineering Education Research (J-PEER)

Researchers have long been interested in how to recruit and retain more and more diverse students into engineering programs. One consistent challenge in this research is understanding the impacts of interventions from the point of view of the student, and how their preconceptions may influence that effectiveness. This study investigated how secondary students understand the concept of engineering, including what engineering is and what engineers do. The purpose of this work was to describe students’ conceptions of engineering, and to determine how those perceptions relate to student interest in engineering careers. The investigation was founded on the theoretical framework of …

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Synthesis Of Pani/Nihcf Nanocomposite Particles And Eqcm Measurement Of Ion Exchange Properties In Solutions Containing Cd2+, Yu-Jiao Yang, Xiao-Gang Hao, Xu-Li Ma, Zhong-De Wang, Zhong-Lin Zhang, Nian-Chen Han Oct 2013

Synthesis Of Pani/Nihcf Nanocomposite Particles And Eqcm Measurement Of Ion Exchange Properties In Solutions Containing Cd2+, Yu-Jiao Yang, Xiao-Gang Hao, Xu-Li Ma, Zhong-De Wang, Zhong-Lin Zhang, Nian-Chen Han

Journal of Electrochemistry

The PANI/NiHCF nanocomposite particles were synthesized on the CNTs-modified Pt substrate by one-step co-polymerization using cyclic voltammetry. Electrochemical quartz crystal microbalance (EQCM) technique was adopted to investigate the polymerization process of the nanocomposite particles and the mechanism of ion exchange in aqueous solution containing Cd2+． The morphology and structure of the as-prepared composite particles were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), and Fourier transform infrared spectroscopy (FT-IR). Combined with cyclic voltammetry (CV) and energy dispersive spectroscopy (EDS), the electrochemical behavior and the mechanism of ion exchange were also investigated in electrolytes of Cd2+ …

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A Comparative Study In Pretreatments Of Acid Chemical Wastewater By Electrochemical Oxidation And Ozonation, Han-Shui Liu, Su Yu, Shao-Ping Tong, Chun-An Ma Oct 2013

A Comparative Study In Pretreatments Of Acid Chemical Wastewater By Electrochemical Oxidation And Ozonation, Han-Shui Liu, Su Yu, Shao-Ping Tong, Chun-An Ma

Journal of Electrochemistry

Under the condition of keeping certain acidity, the pretreatment efficiency of an acid chemical wastewater (pH 0.85) by electrochemical oxidation was compared with that by ozonation. The results showed that the electrochemical oxidation pretreatment could obtain a better result than the ozonation at pH 0.85. After the addition of 2 g·L-1 NaCl and with the electrochemical oxidation pretreatment at 30 mA·cm-2, the removal rate of chemical oxygen demand (CODCr) reached 43.4%, and the value of biochemical oxygen demand/chemical oxygen demand (BOD5/CODCr) also increased from 0.034 to 0.14 in 20 minutes, indicating significantly improvement …

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Electrocatalytic Properties Of The Keggin-Type Co(Ii)-Substituted Heteropolyanion Pw11O39Co(Ii)(H2O)5-, Bin Wang, Chong-Tai Wang, Ying-Jie Hua, Jin-Yuan Liu, Liang-Fei Zheng Oct 2013

Electrocatalytic Properties Of The Keggin-Type Co(Ii)-Substituted Heteropolyanion Pw11O39Co(Ii)(H2O)5-, Bin Wang, Chong-Tai Wang, Ying-Jie Hua, Jin-Yuan Liu, Liang-Fei Zheng

Journal of Electrochemistry

The electrochemical properties of the Keggin-type Co(II)-substituted heteropolyanion PW11O39Co(II)(H2O)5- (PW11Co), as well as the electrocatalytic properties of PW11Co towards the anodic oxidations of H2O2 and CH3OH were studied using the electrochemical methods such as cyclic voltammetry and AC impedance spectroscopy in this paper. An electrocatalytic mechanism of PW11Co as an anodic medium was also proposed. It was found that PW11Co showed a pair of pseudo-reversible redox peaks at the potentials of 1.367 V/1.266 V, corresponding to the redox responses of …

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An Investigation Of Photocatalytic Degradation Reactions Of Pollutants By Combination Of (Photo)Electrochemical Measurements, Wen-Hua Leng, Hong-Qiao Zhu Oct 2013

An Investigation Of Photocatalytic Degradation Reactions Of Pollutants By Combination Of (Photo)Electrochemical Measurements, Wen-Hua Leng, Hong-Qiao Zhu

Journal of Electrochemistry

Semiconductor photocatalysis plays a critical role in the environment protection and future energy development. (Photo)electrochemical measurements are powerful tools for studying the kinetics and mechanism of photocatalytic reactions, since photo-carriers, as reactants of photocatalytic reactions, are involved in the interfacial transfer and recombination of semiconductor/electrolyte interface. This review describes the part of our recent results regarding aqueous photocatalytic decontamination obtained by these methods, and the focus of future work in this field is suggested.

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Preparation Of Benzoquinone From Phenol By Electrooxidation, Dong-Fang Niu, Cheng-Kai Yu, Xin-Sheng Zhang Oct 2013

Preparation Of Benzoquinone From Phenol By Electrooxidation, Dong-Fang Niu, Cheng-Kai Yu, Xin-Sheng Zhang

Journal of Electrochemistry

The benzoquinone was prepared from phenol by electrooxidation in an H-type cell with cation exchange membrane, in which lead plates were used both as an anode and a cathode, while H2SO4 was used as a supporting electrolyte. The effects of current density, concentration of sulphuric acid, concentrations of benzoquinone in electrolyte and extractant on the yields and efficiencies of electrolysis were investigated. Under the optimized conditions of current density being 4 A·dm-2, concentration of sulphuric acid 1 mol·L-1, passed charge 3.2 A·h, the yield and current efficiency of benzoquinone could reach 68% and …

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Experimental Design Methodology Applied To The Oxidation Of Quinolines In Aqueous Medium By Electro-Fenton Process, Souhaila Trabelsi Souissi, Nihal Oturan, Nizar Bellakhal, Mehmet A. Oturan Oct 2013

Experimental Design Methodology Applied To The Oxidation Of Quinolines In Aqueous Medium By Electro-Fenton Process, Souhaila Trabelsi Souissi, Nihal Oturan, Nizar Bellakhal, Mehmet A. Oturan

Journal of Electrochemistry

The degradation behavior of 8-hydroxyquinoleine sulfate (8-HQS), a model molecule of quinolines, was studied in an aqueous medium by electro-Fenton process using a carbon felt cathode and a platinum anode. The great oxidation ability of this process is due to a large production of hydroxyl radical (OH) by electrochemically induced Fenton’s reagent (H2O2, Fe2+). Hydroxyl radicals are very powerful oxidizing agents which react on organics up to complete mineralization. A factorial experimental design was used for determining the operating parameters on the degradation of 8-HQS in an aqueous medium. The results showed that the …

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Basic Principles And Applications Of Secm In Metal Corrosion, Fa-He Cao, Yan Xia, Wen-Juan Liu, Lin-Rong Chang, Jian-Qing Zhang Oct 2013

Basic Principles And Applications Of Secm In Metal Corrosion, Fa-He Cao, Yan Xia, Wen-Juan Liu, Lin-Rong Chang, Jian-Qing Zhang

Journal of Electrochemistry

Scanning electrochemical microscopy (SECM) is chemical microscopy with higher spatial resolution. After 24 years of development, SECM has been widely applied in mapping and kinetics study of heterogeneous electron transfer in localized processes at solid-liquid or liquid-liquid interfaces. The fundamentals and recent advances of SECM in corrosion applications are described, including SECM mapping and kinetics on localized corrosion of metal or coating. Research work of SECM in corrosion by our group is also introduced. Future applications of SECM in corrosion are highlighted.

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Applications Of Spectroscopic Ellipsometry In Corrosion Investigation, Ling-Jie Li, Yu-Ling He, Jing-Lei Lei, Sheng Tao Zhang Oct 2013

Applications Of Spectroscopic Ellipsometry In Corrosion Investigation, Ling-Jie Li, Yu-Ling He, Jing-Lei Lei, Sheng Tao Zhang

Journal of Electrochemistry

As a highly-sensitive and non-destructive in situ technique, spectroscopic ellipsometry has been widely applied in corrosion investigation to acquire the dynamic information of the “electrode-medium” interface during corrosion. This paper lays out some representative demonstrations in several established optical models used to interpret data obtained with spectroscopic ellipsometry in corrosion investigation. In addition, the latest trends in development of this technique are analyzed.

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An Investigation Of Thin Films Formed On Zinc By Spectroscopic Ellipsometry, Juan Zuo, Ying Chen, Chang-Jian Lin, Andreas Erbe Oct 2013

An Investigation Of Thin Films Formed On Zinc By Spectroscopic Ellipsometry, Juan Zuo, Ying Chen, Chang-Jian Lin, Andreas Erbe

Journal of Electrochemistry

The formation of natural oxide films on polycrystalline zinc surface, the growth of natural oxide films in different atmospheres, as well as the electrochemical process of metal zinc in alkaline carbonate solution, studied recently by using spectroscopic ellipsometry in our group, are introduced. The objective of this paper is to outline that the optical, electrical properties, the change and growth kinetics of zinc metal oxide film on the surface can be investigated by in-situ and ex-situ ellipsometry, which makes significant sense to evaluate the overall performance of zinc oxide layer.

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Corrosion Behavior Of A High Strength Low Alloy Steel Under Hydrostatic Pressure In Deep Ocean, Hai-Jing Sun, Li Liu, Ying Li Oct 2013

Corrosion Behavior Of A High Strength Low Alloy Steel Under Hydrostatic Pressure In Deep Ocean, Hai-Jing Sun, Li Liu, Ying Li

Journal of Electrochemistry

The corrosion behavior of a high strength low alloy steel (HSLA steel) in 3.5% NaCl solution under hydrostatic pressure (HP) in deep ocean has been investigated by performing weight loss measurement, obtaining potentiodynamic polarization curve and emplying electrochemical impedance spectroscopy (EIS) using the set up for simulation of deep sea environment in laboratory. The results were compared with that at atmospheric pressure and the influence of HP was emphatically discussed. The results revealed identical corrosion mechanism for HSLA steel at 3.5 × 106 Pa and 1 × 105 Pa. Howevere, the development of such a corrosion process was …

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Corrosion Resistance Of Low Pressure Cold Sprayed Al Coating On Q235 Steel In Seawater, Xiang-Bo Li, Li-Kun Xu, Shan-Guang Qiu, Jia Wang, Guo-Sheng Huang, Cai-Chang Dong Oct 2013

Corrosion Resistance Of Low Pressure Cold Sprayed Al Coating On Q235 Steel In Seawater, Xiang-Bo Li, Li-Kun Xu, Shan-Guang Qiu, Jia Wang, Guo-Sheng Huang, Cai-Chang Dong

Journal of Electrochemistry

Taking aluminium (Al) powder mixed with 10% (by volume) of Al2O3 powder as raw materials, the Al coating was prepared on the Q235 carbon steel substrate using a portable low pressure cold spraying equipment. Through the measurements of the corrosion potential and potentiodynamic polarization, the electrochemical corrosion behavior of the low pressure cold sprayed Al coating in seawater was studied in comparison with those of the Al coatings deposited with high pressure cold spray and thermal spray processes. At the same time, the surface and cross-section morphologies of these coatings were observed with scanning electron microscope. The …

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Corrosion Behavior Of Zinc Covered With Thin Electrolyte Layers Under External Electric Field, Xu-Jie Yuan, Jun-Xi Zhang, Shi-Ming Zhang, Tian Tan, Qi-Meng Chen Oct 2013

Corrosion Behavior Of Zinc Covered With Thin Electrolyte Layers Under External Electric Field, Xu-Jie Yuan, Jun-Xi Zhang, Shi-Ming Zhang, Tian Tan, Qi-Meng Chen

Journal of Electrochemistry

The corrosion behavior of zinc covered with thin electrolyte layers (TELs) under an application of external electric field was investigated by performing corrosion potential and cathodic polarization current measurements. The results showed that the Ecorr and ic values first increased and then decreased with the increase of electrolyte layer thickness. Pure zinc exhibited the maximum corrosion potential as the TELs increased to 400 μm under the controls of cathodic process and corrosion products. The application of external electric field resulted in either a negative shift in corrosion potential of zinc or an increase of cathodic current. The effect of external …

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Cost Of Housing Regulation In Utah Valley-Impact Fees, Rhett M. Turner, Dr. Howard Bashford Oct 2013

Cost Of Housing Regulation In Utah Valley-Impact Fees, Rhett M. Turner, Dr. Howard Bashford

Journal of Undergraduate Research

The purpose of impact fees is to help fund infrastructure needs brought on by new growth. The State of Utah has recently passed legislation which allows cities to charge impact fees for the construction of new homes. These impact fees can be substantial, amounting to thousands of dollars for each home.

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Design And Preparation Of A Ni Steam Reforming Catalyst, Phillip R. Smith, Dr. Calvin H. Bartholomew Oct 2013

Design And Preparation Of A Ni Steam Reforming Catalyst, Phillip R. Smith, Dr. Calvin H. Bartholomew

Journal of Undergraduate Research

Steam reforming catalysts play an essential role in the production of hydrogen, which is an essential fuel, feedstock, and reactant in the worldwide chemical industry. These steam reforming catalysts use a finely dispersed metal, supported on a porous ceramic material, to produce hydrogen from hydrocarbon sources. This is shown in reaction 1, where HC denotes hydrocarbon, H2O denotes water, H2 denotes dihydrogen, CO denotes carbon monoxide, CO2 denotes carbon dioxide, and CH4 denotes methane.

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Low-Power Reference String Design For Cmos Flash Analog-To- Digital Converters, Daniel W. Pulsipher, Dr. Criag Petrie Oct 2013

Low-Power Reference String Design For Cmos Flash Analog-To- Digital Converters, Daniel W. Pulsipher, Dr. Criag Petrie

Journal of Undergraduate Research

Analog-to-digital converters (ADCs) play a prominent role in modern electrical systems. The environment in which we live consists primarily of analog signals, information-carrying waveforms continuous in time and value. Because of this continuous characteristic, analog signals are difficult to store and manipulate. Digital signals are sampled in time and quantized (rounded) in value. Processing of a digital signal can be done more efficiently and flexibly than processing of an analog signal. ADCs are universally needed to construct high-performance digital electronic systems such as cellular phones, satellite equipment, medical instruments, and electronic sensors.

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Multi-Agent Communication Framework, Ryan R. Falke, Dr. James Archibald Oct 2013

Multi-Agent Communication Framework, Ryan R. Falke, Dr. James Archibald

Journal of Undergraduate Research

Multi-agent systems consisting of large numbers of autonomous robots are ideal candidates for tasks that could threaten human lives. However, the complexity and quantity of work required for precise coordination within such systems can be considerable. Our team developed a powerful but lightweight communication framework that significantly reduces the laborious efforts of coordination control. This program offers the ability to pass messages between robotic agents, and maintain knowledge of all robotic interactions. In addition, all the processes and communication nodes are location-independent – a complex task can be distributed amongst various agents. This paper briefly describes the framework designed and …

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Determining Biomass Particle Properties Via Digital Imaging, Justin Scott, Dr. Larry Baxter Oct 2013

Determining Biomass Particle Properties Via Digital Imaging, Justin Scott, Dr. Larry Baxter

Journal of Undergraduate Research

Understanding the devolatilization and combustion of biomass (sawdust, agricultural waste, etc.) will lead to better use of this renewable fuel source. The overall goal of the project is to write a computer model that can accurately predict what will occur during biomass combustion. The research conducted over the past year has focused on developing an apparatus capable of determining the needed data for model development. The apparatus, once completed, will consist of an entrained flow reactor, an optical measurement system, and a computer algorithm to process the needed data from the images.

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Polymers Functioning As Artificial Muscles, Nicholas Stanonis, William Pitt Oct 2013

Polymers Functioning As Artificial Muscles, Nicholas Stanonis, William Pitt

Journal of Undergraduate Research

Current research in the field of polymers has led to the development of synthetic muscles that function similar to biological muscles. Scientists have engineered polymers to contract up to one thousand times their original volume when exposed to changes in light, temperature, voltage, or pH. The ability to contract and relax makes these polymers ideal artificial muscles. Currently, artificial muscles are being applied in the field of robotics. NASA is in the process of developing a dust wiper for their planetary rovers that operates with an artificial muscle. A common goal that many scientists are working towards is the implementation …

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Alignment Of Metal Electrodes With Optical Fibers, Benjamin Ipson, Dr. Stephen Schultz Oct 2013

Alignment Of Metal Electrodes With Optical Fibers, Benjamin Ipson, Dr. Stephen Schultz

Journal of Undergraduate Research

The field of fiber optics is becoming an increasingly important field to the world of communications. With increased use of optical fibers for communication comes the need for devices to use with the fibers. I have been working on the creation of an in-fiber electro-optic modulator. Earlier I worked on a process of creating a waveguide in the fiber that will allow for modulation. This process involves removing a section of the core of a D-shaped fiber and replacing it with a non-linear polymer. I used a chemical etch to remove the core and then used a method of spinning …

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Characterization Of Silicon Oxide And Silicon Nitride Deposition Using Plasma Enhanced Chemical Vapor Deposition (Pecvd), Stephen Markham, Dr. Aaron Hawkins Oct 2013

Characterization Of Silicon Oxide And Silicon Nitride Deposition Using Plasma Enhanced Chemical Vapor Deposition (Pecvd), Stephen Markham, Dr. Aaron Hawkins

Journal of Undergraduate Research

Abstract: Waveguides will become more important as optical networks replace traditional wire networks for data transfer. This research explores one method of creating multimode waveguide that uses Plasma Enhanced Chemical Vapor Deposition to grow oxide and nitride layers on Silicon.

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A Configurable Electro-Anesthesia Device, Preston Manwaring, Dr. Mark Manwaring Oct 2013

A Configurable Electro-Anesthesia Device, Preston Manwaring, Dr. Mark Manwaring

Journal of Undergraduate Research

Electro-anesthesia devices offer the ability to alleviate pain and maintain drug-induced anesthesia without re-administering drugs by passing a specially designed electrical current through the brain to sustain naturally or chemically produced endorphins. This potential extends the clinicians armementarium for pain management, drug-addiction rehabilitation, and general anesthesia. This research focuses on the development of one such device which can be configured to use various waveforms for future electro-anesthesia studies.

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Reproducible, Low-Temperature Growth Of Nanocrystals In An Amorphous Silicon Film, Spencer Kellis, Dr. Aaron Hawkins Oct 2013

Reproducible, Low-Temperature Growth Of Nanocrystals In An Amorphous Silicon Film, Spencer Kellis, Dr. Aaron Hawkins

Journal of Undergraduate Research

During Plasma-Enhanced Chemical Vapor Deposition (PECVD) crystal growth, an electric field between two charged plates dissociates a gas into a cloud of positive and negative ions called a plasma. The silicon ions descend to the silicon wafer and bond to the surface. Temperature is controlled and usually in the range of several hundred degrees celsius. Dispersed throughout the amorphous thin film are patches of crystalline structure that are nanometers in diameter. The goal of this project was to vary temperature, gas flow, gas mixture, gas pressure, and power settings on the PECVD system at BYU so as to consistently produce …

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Co-Validation Of Jason-1 And Quikscat Wind Speeds Within The Context Of Trmm Rain Data, Ryan Halterman, Dr. David Long Oct 2013

Co-Validation Of Jason-1 And Quikscat Wind Speeds Within The Context Of Trmm Rain Data, Ryan Halterman, Dr. David Long

Journal of Undergraduate Research

SeaWinds on QuikSCAT is a satellite-based scatterometer designed to measure near-surface winds over the earth’s oceans. Ocean surface wind speed is an important parameter in many short-term and long-term climate and weather analyses. QuikSCAT is a rapidly developed replacement for the successful, although prematurely terminated, NSCAT mission of similar objectives. Spaceborne scatterometers find raison d’etre in their facilitation of near-global daily coverage. Planetary scale wind vector measurement has proven impractical using only in situ methods.

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Electromagnetic Properties Of Water In The Presence Of A Protein, Kelly Jeppesen, Travis Oliphant Oct 2013

Electromagnetic Properties Of Water In The Presence Of A Protein, Kelly Jeppesen, Travis Oliphant

Journal of Undergraduate Research

Light scattering is a means of detecting certain chemical properties of a sample of material. As a photon (light packet) encounters any material, there is some probability that the photon will be absorbed. The energy from an absorbed photon will either work to heat the sample or be reemitted. When re-emitted, a photon will not necessarily travel in the same direction or with the same phase in which it encountered the material. Also, the amount of energy re-emitted via scattering is dependent on the incident light wavelength and properties of the material, which, for example, is why the sky looks …

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Optical Measurements Of Diesel Soot Formation, Michael Joseph Richards, Dr. Dale Tree Oct 2013

Optical Measurements Of Diesel Soot Formation, Michael Joseph Richards, Dr. Dale Tree

Journal of Undergraduate Research

The purpose of this project was to aid in the research of Kenth Svensson, PhD. student at BYU. I was able to perform many vital tasks in preparation for data acquisition. The proposal which we submitted named three tasks which were measuring and mapping the temperature gradient within a combustion chamber, mapping the mass of the fuel as a function of injection duration and pressure, and calibrating a CCD camera. A partial summary of Svensson’s research topic and objectives is provided below to help others understand the importance of this research.

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