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Articles 391 - 420 of 759
Full-Text Articles in Chemical Engineering
Complexation Reactions And Structure Of The Iron-Molybdenum Cofactor Of Nitrogenase, Dean Wheeler
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.
Methane Recovery At Springville Wastewater, Rochelle Phillips, Dr. William Hecker, Dr. Vincent Wilding
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.
Thermophile Biochemistry, Charles Larsen
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.
A Dns Evaluation Of Mixing Models For Transported Pdf Modelling Of Turbulent Nonpremixed Flames, Alex Krisman, Joshua C.K. Tang, Evatt R. Hawkes, David O. Lignell, Jacqueline H. Chen
A Dns Evaluation Of Mixing Models For Transported Pdf Modelling Of Turbulent Nonpremixed Flames, Alex Krisman, Joshua C.K. Tang, Evatt R. Hawkes, David O. Lignell, Jacqueline H. Chen
Faculty Publications
Transported probability density function (TPDF) methods are well suited to modelling turbulent, reacting, variable density flows. One of the main challenges to the successful deployment of TPDF methods is accurately modelling the unclosed molecular mixing term. This study examines three of the most widely used mixing models: the Interaction by Exchange with the Mean (IEM), Modified Curl (MC) and Euclidean Minimum Spanning Tree (EMST) models. Direct numerical simulation (DNS) data-sets were used to provide both initial conditions and inputs needed over the course of the runs, including the mean flow velocities, mixing frequency, and the turbulent diffusion coefficient. The same …
A Progress Report On The Ultrasound Enhancement Of Antibiotic Action On Streptococcus Pneumoniae, Michael Le Bras, Dr. William G. Pitt
A Progress Report On The Ultrasound Enhancement Of Antibiotic Action On Streptococcus Pneumoniae, Michael Le Bras, Dr. William G. Pitt
Journal of Undergraduate Research
Previous studies show that using antibiotic treatment together with ultrasound enhances the bactericidal effect of antibiotics on many bacterial species (6). The purpose of this research project is to apply these techniques to Streptococcus pneumoniae and the antibiotics ampicillin and gentamicin sulfate. The effectiveness of ampicillin and gentamicin sulfate coupled with the application of ultrasound on S. pneumoniae is the focus of this study.
Development Of Stable Silica Washcoats For Monolithic Substrates, Ethan A. Mastny, Dr. Calvin H. Bartholomew
Development Of Stable Silica Washcoats For Monolithic Substrates, Ethan A. Mastny, Dr. Calvin H. Bartholomew
Journal of Undergraduate Research
The objective was to develop an efficient procedure for depositing silica washcoats onto cellular, ceramic monoliths while ensuring that the silica maintains its desired properties of surface area and pore structure and is stable against erosion. Catalyst coated ceramic monoliths find application in automotive emissions control and other areas of pollution abatement.
The Effect Of Material Choice On Thromboembolism, Peter M. Crapo, Dr. Kenneth Solen
The Effect Of Material Choice On Thromboembolism, Peter M. Crapo, Dr. Kenneth Solen
Journal of Undergraduate Research
Stroke, heart attack, or other severe medical problems may arise when platelet aggregates block a patient’s blood vessels. These aggregates form when blood is exposed to foreign surfaces in biomedical equipment. When blood is first exposed to a foreign surface, platelets adhere to the surface. A cluster of platelets on the surface is called a thrombus. Thrombi grow as more platelets adhere, and the momentum of passing fluid or other causes may dislodge them. Dislodged thrombi are called emboli, and the entire process is called thromboembolism. Thromboembolism cannot be entirely avoided in blood-contacting devices, such as artificial organs.
Ultrasound-Activated Delivery Of Doxorubicin From Polymeric Micelles To Breast Cancer Cells, Philip D. Blood, Dr. William G. Pitt
Ultrasound-Activated Delivery Of Doxorubicin From Polymeric Micelles To Breast Cancer Cells, Philip D. Blood, Dr. William G. Pitt
Journal of Undergraduate Research
A major limitation to the effectiveness of cancer chemotherapy is the toxic side effects it has on normal tissues. Thus, it would be highly advantageous to develop a form of treatment that allows higher doses of drugs to be delivered to tumors without increasing the amount of drug absorbed by healthy tissues. To this end, various controlled drug delivery systems are being devised which aim to preferentially target cancerous tissue.
Low-Frequency Ultrasound Increases Outer Membrane Permeability Of Pseudomonas Aeruginosa And Escherichia Coli, Christopher M. Runyan, Dr. William G. Pitt
Low-Frequency Ultrasound Increases Outer Membrane Permeability Of Pseudomonas Aeruginosa And Escherichia Coli, Christopher M. Runyan, Dr. William G. Pitt
Journal of Undergraduate Research
Our lab has investigated the use of low-frequency ultrasound as an adjuvant to antibacterial therapy. We have found that ultrasound can increase killing of certain combinations of antibiotics with bacteria. Ultrasound at very low frequencies, alone, may kill bacteria; however, these frequencies are harmful to other living tissues and can not be used in a clinical setting. While ultrasound does not kill bacteria at slightly higher frequencies, it can enhance antibiotic killing, a phenomenon known as the “bioacoustic effect.”
Waste Not, Want Not, Mary Cragun, Dr. William Hecker
Waste Not, Want Not, Mary Cragun, Dr. William Hecker
Journal of Undergraduate Research
The treatment of wastewater or sewage is a multi-step process. One of the steps involves the treatment of the organic mass collected during the treatment process. There are several different methods of treating this organic mass or sludge. At the Springville Wastewater Treatment Facility, the sludge is decomposed under anaerobic conditions into simpler forms of organic solids for safe disposal. Two different types of bacteria are used to decompose the sludge. The products of the sludge decomposition are methane, carbon dioxide, water, and simpler organic solids. The amount of methane produced by the bacteria depends on the system used and …
A Stable Coating For Silica Supported Fisher-Tropsch Catalysts, Nathan M. Cluff, Dr. Calvin Batholomew
A Stable Coating For Silica Supported Fisher-Tropsch Catalysts, Nathan M. Cluff, Dr. Calvin Batholomew
Journal of Undergraduate Research
Our daily lives are dependent upon petroleum. This is evident in the fact that 26.4% of the United States’ energy consumption is used directly for transportation in the form of liquid fuels.1 To prevent shortages in gasoline, jet fuel, home heating oil, and other petroleum products, alternatives will be needed to supplement the rising world demand. As a citizen that will raise a family during a time when alternative energy sources will need to be implemented, I have a keen interest in how we will meet our energy needs and where we will get those resources. One alternative is the …
Deactivation Of V2o5-Based Catalysts Used In The Selective Catalytic Reduction Of Nox, Aaron Nackos, Dr. Calvin H. Bartholomew
Deactivation Of V2o5-Based Catalysts Used In The Selective Catalytic Reduction Of Nox, Aaron Nackos, Dr. Calvin H. Bartholomew
Journal of Undergraduate Research
Nitric oxides (NO and NO2, or NOx for short) are significant contributors to photochemical smog and acid rain and are mainly produced from automobile emissions and from coal combustion used to generate electric power. Because of these issues, the EPA will require by the year 2004 that NOx emissions from coal-fired plants in this country meet strict pollution limitations—up to a 90% reduction in the amount of NOx currently allowed to be released by the EPA (Belden 41).
Laboratory Design And Construction For Catalyst Characterization, Kenneth G. Crowther, Dr. Larry Baxter
Laboratory Design And Construction For Catalyst Characterization, Kenneth G. Crowther, Dr. Larry Baxter
Journal of Undergraduate Research
In the midst of industrial development we sometimes fail to foresee problems that may arise from current, seemingly economical, methods of production. One oversight in many industries ranging from Power to Caprolactam production is nitrogen oxide (NOX) emissions that damage our bodies and limit visibility. NOX are highly reactive molecules that are responsible for the formation of ground level ozone, acid aerosols, acid rain, and photochemical smog; all which pose a threat to the health of humans and other living things. This problem, however, is finally noticed. Government legislation is going into effect that is reducing the amounts of NOX …
Optimal Trajectory Generation Using Model Predictive Control For Aerially Towed Cable Systems, Liang Sun, John Hedengren, Randal W. Beard
Optimal Trajectory Generation Using Model Predictive Control For Aerially Towed Cable Systems, Liang Sun, John Hedengren, Randal W. Beard
Faculty Publications
This paper studies trajectory generation for a mothership that tows a drogue using a flexible cable. The contributions of this paper include model validation for the towed cable system described by a lumped mass extensible cable using flight data, and optimal trajectory generation for the towed cable system with tension constraints using model predictive control. The optimization problem is formulated using a combination of the squared error and l1-norm objective functions. Different desired circular trajectories of the towed body are used to calculate optimal trajectories for the towing vehicle subject to performance limits and wind disturbances. Trajectory generation for transitions …
Simulation Of The Evolution Of Pressure In A Lignite Particle During Pyrolysis, He Yang, Sufen Li, Thomas H. Fletcher, Ming Dong, Weishi Zhou
Simulation Of The Evolution Of Pressure In A Lignite Particle During Pyrolysis, He Yang, Sufen Li, Thomas H. Fletcher, Ming Dong, Weishi Zhou
Faculty Publications
The evolution of pressure in a lignite particle during pyrolysis was simulated on the basis of the gas motion equation in porous media and considering the Klinkenberg effect. The chemical percolation devolatilization (CPD) model was used to describe pyrolysis. The pore diameter in the particle is close to the average free path of volatile gas molecules; therefore, the solid phase restrains the movement of gas. Because flow out of the particle is restricted, the internal pressure rises. The internal pressure first increases and then decreases during pyrolysis, and the evolution is influenced by heating conditions. The pressure rise is larger …
Characterization Of Macromolecular Structure Elements From A Green River Oil Shale, Ii. Characterization Of Pyrolysis Products By 13c Nmr, Gc/Ms, And Ftir, Thomas H. Fletcher, Ryan Gillis, Jacob Adams, Trent Hall
Characterization Of Macromolecular Structure Elements From A Green River Oil Shale, Ii. Characterization Of Pyrolysis Products By 13c Nmr, Gc/Ms, And Ftir, Thomas H. Fletcher, Ryan Gillis, Jacob Adams, Trent Hall
Faculty Publications
This paper is Part II of a study of the chemical structural components of the organic matter of oil shale in the Green River formation. Three sections of a well-characterized oil shale core from the Utah Green River formation were demineralized, and the resulting kerogen was pyrolyzed at 10 °C/min in nitrogen at atmospheric pressure at temperatures up to 525 °C. The pyrolysis products (light gas, tar, and char) were analyzed using 13C NMR, GC/MS, and (FTIR). Pyrolysis yields of 80% (daf basis) were achieved at these conditions, with 60% daf tar yield at the highest temperature. The solid-state …
A Post-Installed Subsea Monitoring System For Structural And Flow Assurance Evaluation, David Brower, Alexis Brower, John Hedengren, Reza Asgharzadeh Shishavan
A Post-Installed Subsea Monitoring System For Structural And Flow Assurance Evaluation, David Brower, Alexis Brower, John Hedengren, Reza Asgharzadeh Shishavan
Faculty Publications
This paper describes major advancements for deploying sensing systems on existing subsea structures as part of the Clear Gulf study. In the past, a major shortcoming of post-installed monitoring systems has been poor coupling between the sensor and structure; this study provided methods to overcome this problem. Both subsea field testing and laboratory testing were performed to verify these advancements. The Clear Gulf study is a collaboration between the offshore energy industry and NASA with the goals of risk mitigation, safety, efficiency and environmental concerns in the offshore energy industry. The study is ongoing and has investigated new methods to …
Co2 Char Gasification Rates Of Sawdust, Switchgrass, And Corn Stover In A Pressurized Entrained-Flow Reactor, Thomas H. Fletcher, Aaron D. Lewis, Emmett G. Fletcher
Co2 Char Gasification Rates Of Sawdust, Switchgrass, And Corn Stover In A Pressurized Entrained-Flow Reactor, Thomas H. Fletcher, Aaron D. Lewis, Emmett G. Fletcher
Faculty Publications
An entrained-flow flat-flame burner reactor was used to measure apparent CO2 gasification rates of near-spherical biomass chars of poplar sawdust, switchgrass, and corn stover using particle residence times1258−1891 K and 6.1− 13.5 atm, respectively. A new method was developed to produce near-spherical particles from nonspherical biomass chars. The apparent CO2 gasification rates for the three biomass chars with mean diameters near 100 μm were fit to a global first-order model, and the optimal kinetic parameters are reported. The measured gasification rate of poplar sawdust was about 3.9 times faster than that of switchgrass char, but only about 20% faster than …
Co2 Gasification Rates Of Petroleum Coke In A Pressurized Flat-Flame Burner Entrained-Flow Reactor, Aaron D. Lewis, Emmett G. Fletcher, Thomas H. Fletcher
Co2 Gasification Rates Of Petroleum Coke In A Pressurized Flat-Flame Burner Entrained-Flow Reactor, Aaron D. Lewis, Emmett G. Fletcher, Thomas H. Fletcher
Faculty Publications
Two petcoke samples were gasified by CO2 at total pressures of 10 and 15 atm in a high-pressure flat-flame burner reactor at conditions where the bulk phase consisted of either 40 or 90 mol % CO2 with gas temperatures up to 1909 K. Particle diameters of 45−75 μm were used in the experiments. The morphology of the two petroleum coke chars was drastically different and evaluated using scanning electron microscopy images of the chars. The mass release data caused by CO2 gasification of the petcoke chars were fit to a global first-order model, and the optimal kinetic parameters are reported. …
Application Of L-Systems To Geometrical Construction Of Chamise And Juniper Shrubs, Dallan R. Prince, Marianne E. Fletcher, Chen Shen, Thomas H. Fletcher
Application Of L-Systems To Geometrical Construction Of Chamise And Juniper Shrubs, Dallan R. Prince, Marianne E. Fletcher, Chen Shen, Thomas H. Fletcher
Faculty Publications
Improved models of fire spread and fire characteristics are desired for live shrub fuels, since the majority of existing research efforts focus on either dead fuel beds or crown fires in trees. Efforts have been made to improve live fuel modeling, including detailed studies of individual leaf combustion, with results incorporated into a shrub combustion model for broadleaf species. However, this approach was not well-suited to non-broadleaf shrubs since their fuel consists of long needle-covered branches rather than easily discretized leaves. Methods were therefore developed to simulate the branching structure of chamise (Adenostoma fasciculatum) and Utah juniper (Juniperus osteosperma). The …
Simulation Of The Swelling Of High-Volatile Bituminous Coal During Pyrolysis, He Yang, Sufen Li, Thomas H. Fletcher, Ming Dong
Simulation Of The Swelling Of High-Volatile Bituminous Coal During Pyrolysis, He Yang, Sufen Li, Thomas H. Fletcher, Ming Dong
Faculty Publications
In this paper, a model is established to predict the swelling ratio of high-volatile bituminous coal during pyrolysis, based on the assumption that the structure of bubble distribution in the particle at the beginning of the plastic stage is a central bubble surrounded by many surrounding bubbles. The initial number and size of the bubbles when the particles become plastic are calculated by the pressure in the particle. The chemical percolation devolatilization (CPD) model is used to describe pyrolysis. The pyrolysis of eight types of high-volatile bituminous coals is simulated, and the results are compared with experimental results to verify …
Differences In Burning Behavior Of Live And Dead Leaves, Part 1: Measurements, Thomas H. Fletcher, Dallan R. Prince
Differences In Burning Behavior Of Live And Dead Leaves, Part 1: Measurements, Thomas H. Fletcher, Dallan R. Prince
Faculty Publications
Burning behaviors of individual live and dead leaves were measured in a well-instrumented, well-controlled flat-flame burner. Manzanita (Arctostaphylos glandulosa) branches were harvested from the Chaparral near Riverside, California. Leaves were conditioned to several moisture contents. Two “live” (i.e., not fully dried) groups remained above the fiber saturation point at 34% moisture content (MC; dry basis) and 63% MC. Two “dead” groups were dried to about 4% MC, and one was rehydrated back up to 26% MC. Distinct plateaus in surface temperatures at 175◦C were observed while burning live leaves, but dead leaves showed weaker plateaus, if any. Evidence of high …
Characterization Of Macromolecular Structure Elements From A Green River Oil Shale, I. Extracts, Mark S. Solum, Charles L. Mayne, Anita M. Orendt, Ronald J. Pugmire, Jacob Adams, Thomas H. Fletcher
Characterization Of Macromolecular Structure Elements From A Green River Oil Shale, I. Extracts, Mark S. Solum, Charles L. Mayne, Anita M. Orendt, Ronald J. Pugmire, Jacob Adams, Thomas H. Fletcher
Faculty Publications
This paper is the first of two associated papers describing the structural details of three sections of an oil shale core taken at the Skyline 16 mine in the Utah Uinta Basin. Bitumen was extracted from the shale using methanol/dichloromethane. Kerogen was isolated from the shale, using a nine-step extraction procedure using HCl and HF. Bitumen samples from the three cores were analyzed using high-resolution 13C NMR liquid-state spectroscopy, showing carbon aromaticities of 7%−11%. Aliphatic carbons were dominated by methylene structures, with average aliphatic chain lengths of 24 carbons. The three parent shales and the demineralized kerogens were each …
A Dynamic Optimization Framework With Model Predictive Control Elements For Long Term Planning Of Capacity Investments In A District Energy System, Jose Luis Mojica Velazquez
A Dynamic Optimization Framework With Model Predictive Control Elements For Long Term Planning Of Capacity Investments In A District Energy System, Jose Luis Mojica Velazquez
Theses and Dissertations
The capacity expansion of a district heating system is studied with the objective of evaluating the investment decision timing and type of capacity expansion. District energy is an energy generation system that provides energy, such as heat and electricity, generated at central locations and distributed to the surrounding area. The study develops an optimization framework to find the optimal investment schedule over a 30 year horizon with the options of investing in traditional heating sources (boilers) or a next-generation combined heat and power (CHP) plant that can provide heat and electricity. In district energy systems, the investment decision on the …
A Kinetic Study Of Aqueous Calcium Carbonate, Derek Daniel Harris
A Kinetic Study Of Aqueous Calcium Carbonate, Derek Daniel Harris
Theses and Dissertations
Amorphous calcium carbonate (ACC) precipitation is modeled using particle nucleation, growth, and aggregation. The particles are tracked in terms of their radial size and particle density using direct quadrature method of moments (DQMOM). Four separate nucleation models are implemented and are compared to experimental data. In discord with a recent study, it is shown that classical nucleation, coupled with equilibrium chemistry, is in good agreement with experimental data. Novel nucleation mechanisms are presented which fit the experimental data with slightly greater accuracy. Using equilibrium chemistry it is shown that the equilibrium value of ACC is pKeq = 7.74 at 24C, …
Molecular Modeling Of Dna For A Mechanistic Understanding Of Hybridization, Terry Jacob Schmitt
Molecular Modeling Of Dna For A Mechanistic Understanding Of Hybridization, Terry Jacob Schmitt
Theses and Dissertations
DNA microarrays are a potentially disruptive technology in the medical field, but their use in such settings is limited by poor reliability. Microarrays work on the principle of hybridization and can only be as reliable as this process is robust, yet little is known at the molecular level about how the surface affects the hybridization process. This work uses advanced molecular simulation techniques and an experimentally-parameterized coarse-grain model to determine the mechanism by which hybridization occurs on surfaces and to identify key factors that influence the accuracy of DNA microarrays. Comparing behavior in the bulk and on the surface showed, …
Novel Liposomes For Targeted Delivery Of Drugs And Plasmids, Marjan Javadi
Novel Liposomes For Targeted Delivery Of Drugs And Plasmids, Marjan Javadi
Theses and Dissertations
People receiving chemotherapy not only suffer from side effects of therapeutics but also must buy expensive drugs. Targeted drug and gene delivery directed to specific tumor-cells is one way to reduce the side effect of drugs and use less amount of therapeutics. In this research, two novel liposomal nanocarriers were developed. This nanocarrier, called an eLiposome, is basically one or more emulsion droplets inside a liposome. Emulsion droplets are made of perfluorocarbons which usually have a high vapor pressure. Calcein (as a model drug) and Paclitaxel were used to demonstrate drug delivery, and plasmids and siRNA were used to exemplify …
Modeling The Relaxation Time Of Dna Confined In A Nanochannel, Douglas R. Tree, Yanwei Wang, Kevin D. Dorfman
Modeling The Relaxation Time Of Dna Confined In A Nanochannel, Douglas R. Tree, Yanwei Wang, Kevin D. Dorfman
Faculty Publications
Using a mapping between a Rouse dumbbell model and fine-grained Monte Carlo simulations, we have computed the relaxation time of λ-DNA in a high ionic strength buffer confined in a nanochannel. The relaxation time thus obtained agrees quantitatively with experimental data [Reisner et al., Phys. Rev. Lett. 94, 196101 (2005)] using only a single O(1) fitting parameter to account for the uncertainty in model parameters. In addition to validating our mapping, this agreement supports our previous estimates of the friction coefficient of DNA confined in a nanochannel [Tree et al., Phys. Rev. Lett. 108, 228105 …
Design And Preparation Of A Ni Steam Reforming Catalyst, Phillip R. Smith, Dr. Calvin H. Bartholomew
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.
Determining Biomass Particle Properties Via Digital Imaging, Justin Scott, Dr. Larry Baxter
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.