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Articles 21811 - 21840 of 27416
Full-Text Articles in Engineering
Superior Dna Transport System, David Dickinson, Dr. William Pitt
Superior Dna Transport System, David Dickinson, Dr. William Pitt
Journal of Undergraduate Research
Cancer is one of the leading causes of death worldwide. Although surgeries and chemotherapy have had limited success, these techniques are largely unable to solve the problem and may cause significant damage to a patient’s entire body. Some patients are killed by the chemotherapy. Since many cancers have been found to be caused by the lack of a protein due to mutated DNA, a plasmid DNA carrying a replacement for this gene may be able to solve the problem. P52 is one of the more famous missing proteins, but others have and will continue to be discovered. If DNA could …
Photodefinable Microchannels Made With Spin-On Polymers And Short Sacrificial Etch Times, Christopher Carron, Dr. Aaron Hawkins
Photodefinable Microchannels Made With Spin-On Polymers And Short Sacrificial Etch Times, Christopher Carron, Dr. Aaron Hawkins
Journal of Undergraduate Research
There are currently two basic ways to make microfluidic devices: sacrificial etching and wafer bonding. Each method has both advantages and disadvantages. Sacrificial etching is more consistent than wafer bonding and results in finer and more uniform microfluidic devices, but it is also much slower than wafer bonding and can take weeks or months to complete devices that wafer bonding can typically produce in just a few days. Figure 1 shows the differences between these two methods.
Investigation Of The Effects Of Intraosseous Pressure Rise In The Formation Of Spinal Burst Fractures: A Biphasic Material Approach, Spencer Shore, Dr. Anton Bowden
Investigation Of The Effects Of Intraosseous Pressure Rise In The Formation Of Spinal Burst Fractures: A Biphasic Material Approach, Spencer Shore, Dr. Anton Bowden
Journal of Undergraduate Research
Burst fractures are high-speed spine injuries caused by rapid axial compression of the vertebrae. The traditional explanation for the burst fracture mechanism points to an intraosseous pressure rise due to the entrance of the intervertebral disc through a fractured endplate. Recent experiments [1], however, indicate an actual decrease in both internal pressure and hydraulic resistance in high-speed tests that result in burst fractures. These results cast doubt on the validity of the traditional burst fracture theory. The current study seeks to model the intraosseous pressure rise using the finite element method. In this model, the trabecular core and marrow of …
High-Resolution Bulk Measurement Of Crystal Defects During Deformation Of Highly Textured Copper, Colin Landon, Dr. Brent Adams
High-Resolution Bulk Measurement Of Crystal Defects During Deformation Of Highly Textured Copper, Colin Landon, Dr. Brent Adams
Journal of Undergraduate Research
Plastic deformation of crystalline materials is accommodated by crystallographic slip, and the formation and motion of dislocations. Of particular interest to deformation predictions are the dislocation structures that form internal to grains (i.e. the cellular structures), because of their impact on the plastic behavior of the crystal. However, no generally acceptable models that link the dislocation structures and crystal plasticity exist, as is shown by the number of new theories emerging in the literature.
Stabilization Of Base And Reclaimed Asphalt Pavement For Cold Regions, Bryan Wilson, Dr. W. Spencer Guthrie
Stabilization Of Base And Reclaimed Asphalt Pavement For Cold Regions, Bryan Wilson, Dr. W. Spencer Guthrie
Journal of Undergraduate Research
The access road to a coal mine facility was determined to have failed by BYU researchers after a field investigation in 2008. The road surface was heavily degraded by severe transverse, longitudinal, and fatigue cracking. Deep depressions coincided with the transverse cracks causing extremely poor ride quality. Subsurface testing revealed the base and subgrade to be very low quality with unusually high moisture contents and low dry densities.
Csf Sniffer Final Report, Alyssa Huber, David Miller, Dr. Brian Jensen
Csf Sniffer Final Report, Alyssa Huber, David Miller, Dr. Brian Jensen
Journal of Undergraduate Research
The purpose of our research was to create a tool to help in the treatment of hydrocephalus; hydrocephalus is a disease in which an obstruction causes a build-up of cerebral spinal fluid (CSF), a liquid found in the brain. Artificial shunts or passageways are used to relocate excess CSF in the treatment of hydrocephalus. Shunts are commonly misplaced, further aggravating patients’ symptoms. We developed an instrument, the CSF Sniffer, to increase the accuracy of shunt placement; it informs the neurosurgeon of the location of the instrument tip in the brain by measuring the intensity of light reflected off the brain. …
Collision Avoidance Using Haptic Feedback For A Quadrotor Helicopter, Adam Brandt, Dr. Mark Colton
Collision Avoidance Using Haptic Feedback For A Quadrotor Helicopter, Adam Brandt, Dr. Mark Colton
Journal of Undergraduate Research
The remote operation of a quadrotor unmanned aerial vehicle (UAV) presents unique challenges to the pilot. When flying a traditional aircraft a camera can be directed so that the field of view points out the nose, which is always in the direction of flight, assuming small side-slip angles. Using this camera, a remote pilot can always see obstacles that the aircraft is approaching and respond appropriately to avoid them.
The Effects Of Reclaimed Asphalt Pavement On The Frost Susceptibility Of Soil, Josiah Winkelman, Dr. Spencer Guthrie
The Effects Of Reclaimed Asphalt Pavement On The Frost Susceptibility Of Soil, Josiah Winkelman, Dr. Spencer Guthrie
Journal of Undergraduate Research
Our roadways and pavements are an essential part of our daily lives. Quality road systems have raised the quality of life from the days of the Romans until this very day. Roads are vital parts of shipping, thereby providing us goods and services, of the military, thereby providing us protection, and of general transportation, thereby providing us with opportunities to expand both physically and mentally. Due to the importance of our roads and highways, it is very critical that our roads are kept in good functional condition. The pavement that makes our roads is the key to keeping them usable.
An Experiment In Sustainability: The Olympic Transportation Plan Of Beijing, China, Gregory Macfarlane, Dr. G Grant Schultz
An Experiment In Sustainability: The Olympic Transportation Plan Of Beijing, China, Gregory Macfarlane, Dr. G Grant Schultz
Journal of Undergraduate Research
This paper reports on transportation planning and engineering research sponsored by the Office of Research and Creative Activities (ORCA) at Brigham Young University (BYU). The subject of this research is the Transportation Plan for the 2008 Summer Olympic Games in Beijing, China, specifically the sustainable development strategies employed in this plan. Using foreign investment and expertise, Beijing used the Olympics to meet its current transportation needs as well as prepare for future economic expansion.
Chinese Transportation Contacts, Seth M. Law, Dr. Grant Schultz
Chinese Transportation Contacts, Seth M. Law, Dr. Grant Schultz
Journal of Undergraduate Research
In the past couple of years the dean of the school of engineering and technology has shown increased interest in global involvement for students. He wants us to gain a better edge in an increasingly global world. About a year and a half ago, Dean Parkinson (dean of the college of engineering) gave a college lecture on that subject. At the time I had recently returned from my mission, and it sparked particular interest in me. My family and I enjoy traveling, and world cultures have always been interesting to me. The dean of my college was now exhorting me …
Electrosynthesis Of Glycerol Carbonate From Co2 And Glycerol, Huan Wang, Mei-Xia Zhu, La-Xia Wu, Xiao-Ming Xu, Xue-Ru Zhao, Jia-Xing Lu
Electrosynthesis Of Glycerol Carbonate From Co2 And Glycerol, Huan Wang, Mei-Xia Zhu, La-Xia Wu, Xiao-Ming Xu, Xue-Ru Zhao, Jia-Xing Lu
Journal of Electrochemistry
Glycerol carbonate was obtained from glycerol and carbon dioxide under room temperature and normal pressure by electrochemical method. The effects of synthesis conditions, such as cathode, charge, current density and temperature, on the reaction of glycerol and carbon dioxide have been investigated. The yields of 73% were produced by electrosynthesis of carbonate under the optimized condition, which is much higher than that by common catalysis method. The electrochemical behavior of the reaction system has been studied by cyclic voltammetry, through which the reaction process has been proposed.
Influence Of Pretreatment On Electrocatalytic Property For Methanol Oxidation Of Ptru/Wc, Xiao-Ling Lang, Mei-Qin Shi, Ye-Kun Jiang, Chun-An Ma
Influence Of Pretreatment On Electrocatalytic Property For Methanol Oxidation Of Ptru/Wc, Xiao-Ling Lang, Mei-Qin Shi, Ye-Kun Jiang, Chun-An Ma
Journal of Electrochemistry
The surface of tungsten carbide (WC) was treated by potassium hydroxide (KOH) at different pH values for different time. The PtRu/WC composite was prepared by microwave-assisted polyol method. The phase structure of PtRu/WC composites were characterized by XRD. The electrocatalytic activity was tested by cyclic voltammetry and chronoamperometry. The results indicated that with different pH treatments WC became more readily supported on PtRu. When treating WC in KOH at pH = 14, PtRu exhibited the best degree of crystallinity on WC surface, leading to the highest electrocatalytic activity of PtRu/WC. Moreover, the optimized activity of PtRu/WC towards methanol oxidation was …
Synthesis And Electrochemical Properties Of Li(Ni0.5Co0.2Mn0.3)1-2xTiXNbXO2, Yong Tang, Qin-Lin Liao, Xiang-An Guo
Synthesis And Electrochemical Properties Of Li(Ni0.5Co0.2Mn0.3)1-2xTiXNbXO2, Yong Tang, Qin-Lin Liao, Xiang-An Guo
Journal of Electrochemistry
The cathode-active materials of layered Li(Ni0.5Co0.2Mn0.3)1-2xTixNbxO2(x=0, 0.002, 0.005, 0.01, 0.02)composites were synthesized by the thermal treatment of the coprecipitated precursor at 900 oC in air. The effects of Ti-Nb co-dopants on the structural and electrochemical properties of Li(Ni0.5Co0.2Mn0.3)O2 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical experiments. The results show that the small amounts of Ti-Nb co-dopants in Li(Ni0.5Co0.2Mn0.3)O2significantly decreased the degree of cation mixing in …
Effects Of Fluoroethylene Carbonate Additive On Low Temperature Performance Of Li-Ion Batteries, Feng-Ju Bian, Zhong-Ru Zhang, Yong Yang
Effects Of Fluoroethylene Carbonate Additive On Low Temperature Performance Of Li-Ion Batteries, Feng-Ju Bian, Zhong-Ru Zhang, Yong Yang
Journal of Electrochemistry
The effects of fluoroethylene carbonate (FEC) on the low temperature performance of lithium ion phosphate full battery are evaluated by different techniques. By addition of 5 wt% FEC into a commercial electrolyte, effective solid electrolyte interface (SEI) film can be formed on the graphite electrodes, the discharge capacity retention at -40 oC was increased from 31.7% to 43.7%, and the discharge voltage plateau of the cell is raised. This is attributed to a reduced charge transfer resistance and a lowered polarization on the graphite electrode by electrochemical impedance spectroscopy (EIS) and reference electrode test.
Research Progress Of Intermediate Layers In Ti-Based Oxide Anodes, Xiu-Li Song, Hui-Min Yang, Zhen-Hai Liang
Research Progress Of Intermediate Layers In Ti-Based Oxide Anodes, Xiu-Li Song, Hui-Min Yang, Zhen-Hai Liang
Journal of Electrochemistry
Titanium (Ti)-based oxide anodes are excellent anode materials which have been applied widely in electrochemical fields all over the world. Adding intermediate layers in Ti-based oxide anodes can improve the conductivity, lengthen the lifetime and strengthen the stability between Ti base and metal oxides active layers of electrodes. This article reviews the research progress of intermediate layers in Ti-based oxide anodes. At the same time, current problems existed in the field of Ti-based oxide anodes are pointed out and future development trend in oxide electrode with intermediate layers is prospected.
Advanced Treatment Of Dyeing Wastewater For Reuse By Electrochemical Oxidation, Fei-Xiang Chen, Chu-Yin Yang, Ming-Ming Zhou, Jia-De Wang
Advanced Treatment Of Dyeing Wastewater For Reuse By Electrochemical Oxidation, Fei-Xiang Chen, Chu-Yin Yang, Ming-Ming Zhou, Jia-De Wang
Journal of Electrochemistry
In response to the characteristics of dye wastewater, the electrochemical oxidation of effluents from the biochemical process of dyeing wastewater was studied in the electrochemical reactor using PbO2/Ti electrode as the anode and stainless steel plate as the cathode. The results revealed that the electrochemical oxidation could simultaneously remove the Chemical Oxygen Demand (COD), ammonia and chromaticity. At the residence time of 60 min and current density of 10 mA·cm-2, the COD, ammonia, chromaticity, concentration of chloride ion and pH values could meet the water standards for “the reuse of urban recycling water-water quality standard for …
Voltage Reversal Behavior In Microbial-Anode Fuel Cells, En-Ren Zhang, Jun-Le Niu, Lei Liu, Guo-Wang Diao
Voltage Reversal Behavior In Microbial-Anode Fuel Cells, En-Ren Zhang, Jun-Le Niu, Lei Liu, Guo-Wang Diao
Journal of Electrochemistry
Voltage reversal behavior was investigated in microbial-anode fuel cells (MFCs). Electricity-producing biofilms were developed on the surface of anodes in MFCs inoculated with mixed inoculum from activated sludge. MFC duplicates generally exhibited different performances with respect to the internal resistance, the voltage output and the discharging duration when operating in batch mode. Voltage reversal was observed to occur first in the MFC with lower performance when connecting MFCs in series. Analysis of electrode potentials indicated that the potentials of microbial anodes quickly shifted to more positive values when enhancing discharge current, resulting in voltage reversal in MFCs. Increasing temperature would …
Using Hydrolyzed Sludge Liquor As The Substrate Of Microbial Fuel Cell, Peng Liang, Chao Guo, Xia Huang
Using Hydrolyzed Sludge Liquor As The Substrate Of Microbial Fuel Cell, Peng Liang, Chao Guo, Xia Huang
Journal of Electrochemistry
Hydrolyzed sludge liquor was used as the substrate of microbial fuel cell. When the thermal treatment time increased from 2 h to 96 h, pH varied little between 7.4 and 8.0. When the treatment time increased, the conductivity, COD and alkaline condition increased to 2.53 mS·cm-1, 2520 mg·L-1 and 800 mg·L-1, respectively. Meanwhile, the power density increased to 25 W·m-3. The COD removal increased firstly, then decreased, and finally reached the maximum of 47% at the hydrolyzed time of 6 h. The maximal coulombic efficiency was 71% when the treatment time was 4 …
Electrochemically Switched Ion Exchange Properties Of Pani-Snp Composite Films In Wastewater Containing Ni2+ And Cd2+, Yan-Ting Feng, Jun-Qiang Xiao, Xiao-Gang Hao, Xu-Li Ma, Zhong-De Wang, Nian-Chen Han
Electrochemically Switched Ion Exchange Properties Of Pani-Snp Composite Films In Wastewater Containing Ni2+ And Cd2+, Yan-Ting Feng, Jun-Qiang Xiao, Xiao-Gang Hao, Xu-Li Ma, Zhong-De Wang, Nian-Chen Han
Journal of Electrochemistry
Electroactive PANI-SnP composite films were prepared by drop-coating method on Pt electrodes and investigated as electrochemically switched ion exchange (ESIX) materials for the separation of Cd2+ from aqueous solutions. The composition and morphology of the composite film were characterized by Fourier transform infrared spectrometer (FTIR) and scanning electron microscope (SEM). In solutions containing 0.1 mol·L-1 Ni(NO3)2 and Cd(NO3)2, cyclic voltammetry (CV) and electrochemical quartz crystal microbalance (EQCM) were used to investigate the electrochemical behavior and ion-exchange mechanism of PANI-SnP composite film. The elementary composition of PANI-SnP composite films in both oxidation …
Graphene Quantum Dots Enhanced Electrochemical Performance Of Polypyrrole As Supercapacitor Electrode, Kun Wu, Si-Zhe Xu, Xue-Jiao Zhou, Hai-Xia Wu
Graphene Quantum Dots Enhanced Electrochemical Performance Of Polypyrrole As Supercapacitor Electrode, Kun Wu, Si-Zhe Xu, Xue-Jiao Zhou, Hai-Xia Wu
Journal of Electrochemistry
With an objective to develop electrode materials with high specific capacitance and good stability, a completely new nanocomposite of Polypyrrole (PPY) and graphene quantum dots (GQD) was successfully obtained through in-situ polymerization of pyrrole in the presence of GQD suspension. The obtained composites with different mass ratios were characterized by X-Ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). GQD enhanced electrochemical performance of PPY and, as supercapacitor electrodes, the PPY/GQD composites with the mass ratio of PPY to GQD at 50:1 showed a competitive specific capacitance of 485 F·g-1 at a scan rate of …
Electrocatalytic Oxidation Degradation Kinetics Of Oxalic Acid In A Cylindrical Electrochemical Reactor With Ti/Iro2-Ta2O5 Anode, Jing Su, Hai-Bo Lin, Hong Xu, Wei-Min Huang, Ya-Peng He
Electrocatalytic Oxidation Degradation Kinetics Of Oxalic Acid In A Cylindrical Electrochemical Reactor With Ti/Iro2-Ta2O5 Anode, Jing Su, Hai-Bo Lin, Hong Xu, Wei-Min Huang, Ya-Peng He
Journal of Electrochemistry
The electrocatalytic oxidation degradation kinetics of oxalic acid in a cylindrical electrochemical reactor with Ti/IrO2-Ta2O5 as an anode was studied. The relation between instantaneous current efficiency and organic concentration in bulk was established based on the two paths for direct electrochemical oxidations, and the theoretical model was verified by experiments. The experimental resultswere reasonably consistent with the established kinetic model. Furthermore, the competition between the two paths was explored with the modelparameter analysis.
Performance Of The Electro-Oxidation And Electro-Fenton Processes With A Bdd Anode For The Treatment Of Low Contents Of Pharmaceuticals In A Real Water Matrix, Sirs Ignasi, Antonio Garrido Jos, Brillas Enric
Performance Of The Electro-Oxidation And Electro-Fenton Processes With A Bdd Anode For The Treatment Of Low Contents Of Pharmaceuticals In A Real Water Matrix, Sirs Ignasi, Antonio Garrido Jos, Brillas Enric
Journal of Electrochemistry
Here, we report the performance of electro-oxidation and electro-Fenton with a boron-doped diamond (BDD) anode for the treatment of single and multicomponent solutions containing small amounts of pharmaceutical residues (i.e., 1 mg·L-1 paracetamol and/or 1 mg·L-1 salicylic acid) spiked into a real water matrix at pH 3.0. Electro-oxidation was performed in a BDD/Pt cell, whereas electro-Fenton was carried out in a BDD/air-diffusion cell to electrogenerate H2O2 at the cathode, always operating at constant current density. It was found that the decay of both pharmaceuticals by electro-oxidation was more rapid in the real water matrix than …
Electrochemical Behavior And Content Determination Of Paeonol At Poly Sudan Ⅲ Modified Electrode, Yan-Jie Zheng, Ai-Lin Liu, Yun Lei, Xin-Hua Lin
Electrochemical Behavior And Content Determination Of Paeonol At Poly Sudan Ⅲ Modified Electrode, Yan-Jie Zheng, Ai-Lin Liu, Yun Lei, Xin-Hua Lin
Journal of Electrochemistry
The poly SudanⅢ modified electrode was characterized by electrochemical impedance spectroscopy(EIS)and cyclic voltammetry (CV), while the electrochemical behavior of paeonol was studied by cyclic voltammetry (CV). The result shows that the poly Sudan Ⅲ modified electrode exhibits excellent electrocatalytic effect on the oxidation of paeonol. The peak currents of differential pulse voltammetry are linear to the paeonol concentrations over the range of 3.0*10-7 ~ 2.2*10-5 mol·L-1. The detection limit has been estimated to be 5.0*10-8 mol·L-1. This method can be used for determination of paeonol content in real sample with satisfactory results.
Gedtools Computerized Chinese Genealogy Entry Automation, Nicholas Vrvilo, Dr. Dah-Jye Lee
Gedtools Computerized Chinese Genealogy Entry Automation, Nicholas Vrvilo, Dr. Dah-Jye Lee
Journal of Undergraduate Research
Doing family history in Chinese has many unique challenges. The Chinese writing system is not readable by the average person, which means only the small number of individuals who both hold temple recommends and are familiar with Chinese characters would be able to perform all of the family history work for all of the Chinese people. To avoid this problem, the Church requires Romanized1 versions of all Chinese names to be included all family history records submitted for temple work. This poses a problem because most Chinese genealogy workers in Taiwan (where a great deal of Chinese genealogy work is …
Plastics For Designers, Colburn L. Jones
Plastics For Designers, Colburn L. Jones
Journal of Undergraduate Research
Plastics for Designers is a basic survey of the industry of plastics specifically written to address the questions and needs of the industrial designer. It is interesting that most people understand and are much more familiar with materials such as wood, metal, glass, stone, etc., than they are with plastics. This is quite amazing when we consider how much we surround ourselves with the very substance of which we are so ignorant. For the industrial designer this unfamiliarity with plastics is an especially vulnerable position as the number of products specifying the use of plastic grows exponentially. It is therefore …
Analysis Of Prosthetic Leg Shock Absorption And Structure, Russell Dibb, David Williams, Dr. Mark Colton
Analysis Of Prosthetic Leg Shock Absorption And Structure, Russell Dibb, David Williams, Dr. Mark Colton
Journal of Undergraduate Research
The purpose of the prosthetic leg project was to research and design a below-the-knee prosthetic leg that could be used in developing countries. Many prosthetic legs that are currently on the market are very expensive and difficult to manufacture in undeveloped areas of the world. The engineering challenges that the prosthetic leg design addressed include a device that is 1) capable of being manufactured at a low cost ($100-$500), 2) simply and easily reproducible in a developing country, 3) durable enough to hold up to the vigorous conditions that exist in a developing country, and 4) able to effectively modeling …
Parametric Human Spine Model, Simeon Smith, Dr. Anton Bowden
Parametric Human Spine Model, Simeon Smith, Dr. Anton Bowden
Journal of Undergraduate Research
Three-dimensional computer models are commonly used to understand and analyze pathological conditions of the spine. Models of the spine are most beneficial when they match each patient’s spinal geometry. Currently, making a model for a specific patient is a long, multi-step process that must be started anew for each person. The goal of this project was to create a parametric model that can be used to instantly generate the spinal geometry of any particular patient based on the input of a few controlling parameters.
Development Of A Simple Manufacturing Process For A Prosthetic Leg, Kyle Smith, Dr. Mark Colton
Development Of A Simple Manufacturing Process For A Prosthetic Leg, Kyle Smith, Dr. Mark Colton
Journal of Undergraduate Research
The purpose of this project was to develop a simple process to manufacture a useful and affordable prosthetic leg to be made available to below-the-knee amputees in a sub-Saharan African country. This project was motivated by a desire for learning and experience and also by humanitarian and social entrepreneurship ideals. The project was carried out as a joint effort by a larger research team composed of members of the BYU Biomedical Engineering Club. As this was a joint team effort, many of the tasks detailed in this report were shared between several team members. Currently, the team has identified partners …
Sustainable Bulding Materials In Mozambique, Jared Geddes, Dr. Robert Todd
Sustainable Bulding Materials In Mozambique, Jared Geddes, Dr. Robert Todd
Journal of Undergraduate Research
The research that I conducted this year was in the area of sustainable building materials. I worked with a team of six engineers to develop a sustainable building material that would be able to withstand the heavy monsoon rains common to the area of Beira, Mozambique. Every year, these rains destroy up to 60% of the local buildings, consisting mainly of local residences made from mud, straw, and sticks. This destruction and the resultant flooding causes an unsafe and unsanitary condition for the local residents. One of the most dangerous aspects of this flooding is the problem of the sanitation. …
Development Of A Simple Manufacturing Process For A Prosthetic Leg, John Christiansen, Dr. Mark Colton
Development Of A Simple Manufacturing Process For A Prosthetic Leg, John Christiansen, Dr. Mark Colton
Journal of Undergraduate Research
The purpose of this project was to develop a simple process to manufacture a useful and affordable prosthetic leg to be made available to below-‐the-‐knee amputees in a sub-‐ Saharan African country. This project was motivated by a desire for learning and experience and also by humanitarian and social entrepreneurship ideals. The project was carried out as a joint effort by a larger research team composed of members of the BYU Biomedical Engineering Club. As this was a joint team effort, many of the tasks detailed in this report were shared between several team members. Currently, the team has identified …