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Articles 2281 - 2310 of 7292
Full-Text Articles in Engineering
Ionic Liquid Based Extraction Of Lipids From Micro-Algae, Lars Rehmann
Ionic Liquid Based Extraction Of Lipids From Micro-Algae, Lars Rehmann
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Ni-Functionalized Carbon Nano-Filaments As Biodiesel Steam Reforming Catalyst, Nicolas Abatzoglou, Camrina Reyes Plascencia
Ni-Functionalized Carbon Nano-Filaments As Biodiesel Steam Reforming Catalyst, Nicolas Abatzoglou, Camrina Reyes Plascencia
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
An Industrial Demonstration Of Biorefinery Of Lipids:Coproduction Of Biodiesel And 1,3-Propandiol, Dehua Liu
An Industrial Demonstration Of Biorefinery Of Lipids:Coproduction Of Biodiesel And 1,3-Propandiol, Dehua Liu
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Biodiesel Transesterificationin A Fluidized Bed, Daria Boffito, Mahesh Edake, Cristian Neagoe, Blanca Ramirez, Gregory Patience
Biodiesel Transesterificationin A Fluidized Bed, Daria Boffito, Mahesh Edake, Cristian Neagoe, Blanca Ramirez, Gregory Patience
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Automated Channel Assessment For Single Chip Medradio Transceivers, Mark Alexander Hillig
Automated Channel Assessment For Single Chip Medradio Transceivers, Mark Alexander Hillig
Dissertations and Theses
Modern implantable and body worn medical devices leverage wireless telemetry to improve patient experience and expand therapeutic options. Wireless medical devices are subject to a unique set of regulations in which monitoring of the available frequency spectrum is a requirement. To this end, implants use software protocols to assess the in-band activity to determine which channel should be used. These software protocols take valuable processing time and possibly degrade the operational lifetime of the battery. Implantable medical devices often take advantage of a single chip transceiver as the physical layer for wireless communications. Embedding the channel assessment task in the …
Mobile Educational Forum, Suzanne Lien, Alexandria Shearer
Mobile Educational Forum, Suzanne Lien, Alexandria Shearer
Computer Science and Engineering Senior Theses
Good education is essential for youth around the world. However, many communities in the developing world do not have access to basic knowledge and resources, like HIV prevention, womens rights, and life skills. As a result, the youth in these communities grow up and face difficult substandard lives. The Mobile Educational Forum addresses these issues by enabling a central party to distribute educational information to youth in emerging markets by making use of resources they already have on hand--mobile phones. Through our mobile web application, young people not only receive valuable information, but are also able to engage in discourse …
Effect Of Particle Size On Enzymatic Hydrolysis Of Pretreated Miscanthus, Vijay Singh, Esha Khullar, Bruce Dien, Kent Rausch, M.E. Tumbleson
Effect Of Particle Size On Enzymatic Hydrolysis Of Pretreated Miscanthus, Vijay Singh, Esha Khullar, Bruce Dien, Kent Rausch, M.E. Tumbleson
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Alcohol Production From Pyrolytic Sugars Obtained From Selective Fast Pyrolysis Of Pretreated Wood, Luis Luque, Franco Berruti, Sascha Kersten, Guus Van Rossum, Roel Westerhof, Lars Rehmann
Alcohol Production From Pyrolytic Sugars Obtained From Selective Fast Pyrolysis Of Pretreated Wood, Luis Luque, Franco Berruti, Sascha Kersten, Guus Van Rossum, Roel Westerhof, Lars Rehmann
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Microfluidic Detection Of Arsenic Contamination In Groundwater, Mary Reynolds, Kyle Perricone
Microfluidic Detection Of Arsenic Contamination In Groundwater, Mary Reynolds, Kyle Perricone
Bioengineering Senior Theses
The difficulty of detecting small quantities of arsenic in water currently threatens the health of millions of people worldwide, as long-term exposure to arsenic has been associated with both cancerous and noncancerous health risks. Existing technologies make it possible to very accurately quantify arsenic levels in water; however the expense, extensive training, and off-site analysis required by these methods impede wide scale use. Here, we report on research to develop an affordable and point-of-use microfluidic platform capable of detecting trace amounts of arsenic in groundwater samples. We intend this device to meet the World Health Organization's (WHO's) ASSURED criteria for …
Backprojection For Synthetic Aperture Radar, Michael Israel Duersch
Backprojection For Synthetic Aperture Radar, Michael Israel Duersch
Theses and Dissertations
Synthetic aperture radar (SAR) is a type of radar capable of high-resolution coherent imaging. In order to produce coherent imagery from raw SAR data, an image formation algorithm is employed. The various image formation algorithms have strengths and weaknesses. As this work shows, time-domain backprojection is one algorithm whose strengths are particularly well-suited to use at low-altitudes. This work presents novel research in three areas regarding time-domain backprojection. The first key contribution of this work is a detailed analysis of SAR time-domain backprojection. The work derives a general form of backprojection from first principles. It characterizes the sensitivities of backprojection …
Subthreshold Op Amp Design Based On The Conventional Cascode Stage, Kurtis Daniel Cahill
Subthreshold Op Amp Design Based On The Conventional Cascode Stage, Kurtis Daniel Cahill
Theses and Dissertations
Op amps are among the most-used components in electronic design. Their performance is important and is often measured in terms of gain, bandwidth, power consumption, and chip area. Although BJT amplifiers can achieve high gains and bandwidths, they tend to consume a lot of power. CMOS amplifiers utilizing the strong inversion region alone use less power than BJT amplifiers, but generally have lower gains and bandwidths. When CMOS SPICE models were improved to accurately simulate all regions of inversion, researchers began to test the performance of amplifiers operating in the weak and moderate inversion regions. Previous work had dealt with …
Influence Of Media Composition On The Growth Rate Of Chlorella Vulgaris And Scenedesmus Acutus Utilized For Co2 Mitigation, Czarena L. Crofcheck, Xinyi E, Aubrey Shea, Michael D. Montross, Mark Crocker, Rodney Andrews
Influence Of Media Composition On The Growth Rate Of Chlorella Vulgaris And Scenedesmus Acutus Utilized For Co2 Mitigation, Czarena L. Crofcheck, Xinyi E, Aubrey Shea, Michael D. Montross, Mark Crocker, Rodney Andrews
Biosystems and Agricultural Engineering Faculty Publications
Atmospheric carbon dioxide levels have increased since the industrial revolution due to increasing combustion of fossil fuels. One possible CO2 mitigation strategy is the use of microalgae for mitigation of CO2. This paper focuses on the influence of media composition on the growth rate of two microalgae strains, Chlorella vulgaris and Scenedesmus actus. A KNO3 based medium was found to work better for Chlorella, while a urea based equivalent worked better for Scenedesmus. The urea based media investigated here resulted in growth similar to that found with previously reported KNO3 based media. …
Space Debris Mitigation Conops Development, Earl B. Alejandro
Space Debris Mitigation Conops Development, Earl B. Alejandro
Theses and Dissertations
Space debris remains an unsolved hazard for space operators and astronomers alike. Passive debris mitigation techniques have been enumerated and codified by the UNCOPUOS and IADC and several proposals for actively mitigating space debris have been presented. However, the space debris problem requires reframing. On the way to developing a viable CONOPS, a multi-disciplinary construct for building solution sets to tackle the space debris problem must be created. It must be shaped by building blocks of active and passive debris mitigation techniques, debris characterization and law. Central considerations must be taken. First, targeting of space debris for removal must be …
Evaluation Of Cyber Sensors For Enhancing Situational Awareness In The Ics Environment, Jeremy R. Otis
Evaluation Of Cyber Sensors For Enhancing Situational Awareness In The Ics Environment, Jeremy R. Otis
Theses and Dissertations
Industrial Control Systems (ICS) monitor and control operations associated with the national critical infrastructure (e.g., electric power grid, oil and gas pipelines and water treatment facilities). These systems rely on technologies and architectures that were designed for system reliability and availability. Security associated with ICS was never an inherent concern, primarily due to the protections afforded by network isolation. However, a trend in ICS operations is to migrate to commercial networks via TCP/IP in order to leverage commodity benefits and cost savings. As a result, system vulnerabilities are now exposed to the online community. Indeed, recent research has demonstrated that …
Improving Multiple Surface Range Estimation Of A 3-Dimensional Flash Ladar In The Presence Of Atmospheric Turbulence, Brian J. Neff
Improving Multiple Surface Range Estimation Of A 3-Dimensional Flash Ladar In The Presence Of Atmospheric Turbulence, Brian J. Neff
Theses and Dissertations
Laser Radar sensors can be designed to provide two-dimensional and three-dimensional (3-D) images of a scene from a single laser pulse. Currently, there are various data recording and presentation techniques being developed for 3-D sensors. While the technology is still being proven, many applications are being explored and suggested. As technological advancements are coupled with enhanced signal processing algorithms, it is possible that this technology will present exciting new military capabilities for sensor users. The goal of this work is to develop an algorithm to enhance the utility of 3-D Laser Radar sensors through accurate ranging to multiple surfaces per …
Kernel Extended Real-Valued Negative Selection Algorithm (Kernsa), Brett A . Smith
Kernel Extended Real-Valued Negative Selection Algorithm (Kernsa), Brett A . Smith
Theses and Dissertations
Artificial Immune Systems (AISs) are a type of statistical Machine Learning (ML) algorithm based on the Biological Immune System (BIS) applied to classification problems. Inspired by increased performance in other ML algorithms when combined with kernel methods, this research explores using kernel methods as the distance measure for a specific AIS algorithm, the Real-valued Negative Selection Algorithm (RNSA). This research also demonstrates that the hard binary decision from the traditional RNSA can be relaxed to a continuous output, while maintaining the ability to map back to the original RNSA decision boundary if necessary. Continuous output is used in this research …
Dynamic Network Topologies, Heather A. Lingg
Dynamic Network Topologies, Heather A. Lingg
Theses and Dissertations
Demand for effective network defense capabilities continues to increase as cyber attacks occur more and more frequently and gain more and more prominence in the media. Current security practices stop after data encryption and network address filtering. Security at the lowest level of network infrastructure allows for greater control of how the network traffic flows around the network. This research details two methods for extending security practices to the physical layer of a network by modifying the network infrastructure. The first method adapts the Advanced Encryption Standard while the second method uses a Steiner tree. After the network connections are …
Classification Of Encrypted Web Traffic Using Machine Learning Algorithms, William C. Barto
Classification Of Encrypted Web Traffic Using Machine Learning Algorithms, William C. Barto
Theses and Dissertations
The increasing usage of web services and encrypted network communication makes the network analysis of encrypted web traffic of utmost importance. This research evaluates the feasibility of using ML algorithms to classify web services within encrypted TLS flows. The ML algorithms are compared primarily based on classification accuracy. The runtimes of the classifiers are also considered, as classifiers must be able determine labels quickly in order to be used in near realtime network protection devices. Five ML algorithms are initially considered when analyzing only the first 12 packets: Naive Bayes, NBTree, LibSVM, J4.8, and AdaBoost+J4.8. AdaBoost+J4.8 and J4.8 produce the …
Enabling Fermentation Utilization Of Pyrolytic Substrates For The Production Of Biorenewable Fuels And Chemicals, Laura Jarboe, Zhiyou Wen, Robert Brown
Enabling Fermentation Utilization Of Pyrolytic Substrates For The Production Of Biorenewable Fuels And Chemicals, Laura Jarboe, Zhiyou Wen, Robert Brown
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Metabolic Engineering Of Clostridium Cellulolyticum For Advanced Biofuel Production, Andrea Liedtke, Stefan Jennewein
Metabolic Engineering Of Clostridium Cellulolyticum For Advanced Biofuel Production, Andrea Liedtke, Stefan Jennewein
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Energy Efficient Biogas Upgrading By Anaerobic Hydrolysis, Rolf Jung
Energy Efficient Biogas Upgrading By Anaerobic Hydrolysis, Rolf Jung
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Optimization Of Biomethanization Processes Through Trace Metals Supplementation, Christpeace Ezebuiro, K. Techamanoon, J. Ezinma, I. Korner
Optimization Of Biomethanization Processes Through Trace Metals Supplementation, Christpeace Ezebuiro, K. Techamanoon, J. Ezinma, I. Korner
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Preliminary Assessments Of Microalgae Direct Transesterification For Biodiesel Production, G. Oliveri, I. Gargano, R. Marotta, R. Andreozzi, A. Marzocchella
Preliminary Assessments Of Microalgae Direct Transesterification For Biodiesel Production, G. Oliveri, I. Gargano, R. Marotta, R. Andreozzi, A. Marzocchella
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Producing Hydrocarbon Drop-In Biofuelsfrom Cellulosic Materials, Birgitte Ahring
Producing Hydrocarbon Drop-In Biofuelsfrom Cellulosic Materials, Birgitte Ahring
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Biobutanol Production From High Sugar Content Wastewaters, Giuseppe Olivieri, Francesca Raganati, Antonio Marzocchella, Piero Salatino, Maria Elena Russo
Biobutanol Production From High Sugar Content Wastewaters, Giuseppe Olivieri, Francesca Raganati, Antonio Marzocchella, Piero Salatino, Maria Elena Russo
BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals
No abstract provided.
Project Omoverhi : Low-Cost, Neonatal Incubator, Richard Fong, Guillermo Gallardo, William Jeffery, Danny Maeda, Gabriel Romero
Project Omoverhi : Low-Cost, Neonatal Incubator, Richard Fong, Guillermo Gallardo, William Jeffery, Danny Maeda, Gabriel Romero
Interdisciplinary Design Senior Theses
Project Omoverhi, since its beginning in 2010-2011, has been focused on creating an incubator that has the capability of operating completely off grid. This year the project has been focused on redesigning the original system to reduce the cost to approximately $1000. In addition to this we have designed and implemented a control system that enables the user to set a desired temperature which can be maintained to within 1 degree Celsius. Before the project is able to be completed further work must be done. The thermal storage system that was initially proposed by the original team still needs to …
Crack Initiation And Growth Behavior At Corrosion Pit In 7075-T6 High Strength Aluminum Alloy, Eric M. Hunt
Crack Initiation And Growth Behavior At Corrosion Pit In 7075-T6 High Strength Aluminum Alloy, Eric M. Hunt
Theses and Dissertations
Research on fatigue crack formation from two types corrosion pits tangent to a circular hole in a 7075-T6 aluminum alloy subjected to uni-axial loads (R = 0.5, lambda = 0) in both an air and saltwater environment provides a method for exploring crack initiation and initial growth rates. This work focuses on a fracture mechanics approach to explore the transition from corrosion pit to crack growth. Specimens with a cylinder shaped through-pit tangent to a circular hole have a closed form solution to predict this delta K that closely resembles the finite element solutions. Specimens with a semi-circular corner-pit tangent …
Design Of A Lighter Than Air Vehicle That Achieves Positive Buoyancy In Air Using A Vacuum, Trent T. Metlen
Design Of A Lighter Than Air Vehicle That Achieves Positive Buoyancy In Air Using A Vacuum, Trent T. Metlen
Theses and Dissertations
Three designs for a Lighter Than Air (LTA) structure that achieve positive buoyancy using a vacuum in place of a lifting gas were proposed and evaluated. The ratio of structure weight to the weight of displaced air was termed Weight/Buoyant Force (W/B) where a W/B1 corresponds to positive buoyancy. Two methods of geometrically stiffening a sphere were investigated and their W/B evaluated. A thin shelled sphere of beryllium stiffened with an isogrid of blade type stiffeners using Ultra High Modulus (UHM) carbon epoxy was predicted to give a W/B= 0.79. A geodesic sphere composed of a frame of cylindrical, UHM, …
Applied Hypergame Theory For Network Defense, Alan S. Gibson
Applied Hypergame Theory For Network Defense, Alan S. Gibson
Theses and Dissertations
Cyber operations are the most important aspect of military conflicts in the 21st century, but unfortunately they are also among the least understood. The continual battle for network dominance between attackers and defenders is considered to be a complex game. Hypergame theory is an extension of game theory that addresses the kind of games where misperception exists, as is often the case in military engagements. Hypergame theory, like game theory, uses a game model to determine strategy selection, but goes beyond game theory by examining subgames that exist within the full game. The inclusion of misperception and misinformation in the …
Side-Channel Analysis Of Subscriber Identity Modules, John A. Hearle
Side-Channel Analysis Of Subscriber Identity Modules, John A. Hearle
Theses and Dissertations
Subscriber identity modules (SIMs) contain useful forensic data but are often locked with a PIN code that restricts access to this data. If an invalid PIN is entered several times, the card locks and may even destroy its stored data. This presents a challenge to the retrieval of data from the SIM when the PIN is unknown. The field of side-channel analysis (SCA) collects, identifies, and processes information leaked via inadvertent channels. One promising side-channel leakage is that of electromagnetic (EM) emanations; by monitoring the SIM's emissions, it may be possible to determine the correct PIN to unlock the card. …