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2013

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Articles 5611 - 5640 of 7289

Full-Text Articles in Engineering

Charged Particle Imaging Methods For Cd Metrology Of Sub 22nm 3d Device Structures, Aron Joel Cepler Jan 2013

Charged Particle Imaging Methods For Cd Metrology Of Sub 22nm 3d Device Structures, Aron Joel Cepler

Legacy Theses & Dissertations (2009 - 2024)

Critical dimension scanning electron microscopes (CD-SEMs) are used to perform highly accurate dimensional metrology on patterned features. In order to ensure optimal feedback for process control, it is necessary that these tools produce highly reproducible measurements. As the smallest device features continue to shrink, and new challenging high aspect ratio (HAR) structures are being introduced, gaps are appearing between process control measurements that are necessary for high volume manufacturing and the capabilities of the CD-SEM. Two possible routes for solving this problem include improvement of the existing CD-SEM technology or the replacement of the CD-SEM.

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The Localized Manipulation Of The Extracellular Matrix Within 3d Collagen Cell Cultures Using A Biomems Device, Ashley N. Clark Jan 2013

The Localized Manipulation Of The Extracellular Matrix Within 3d Collagen Cell Cultures Using A Biomems Device, Ashley N. Clark

Legacy Theses & Dissertations (2009 - 2024)

Approximately 90% of all cancer related deaths can be attributed to the occurrence of metastasis. There are multiple changes that occur within the tumor microenvironment that have been correlated with the onset of metastasis. Different cell types, extracellular matrices, blood vessels, and soluble factors are some of the various components that make up the complex, heterogeneous microenvironment that exists within a tumor. The dynamic relationship between tumor cells and their surrounding environment makes it an ideal environment to study triggers of metastasis, such as the modification of the extracellular matrix. Changes in the multiple aspects of extracellular matrix composition have …

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Plasmonic-Based High Temperature Chemical Sensing Using Gold Nanoparticles Embedded In Metal Oxide Thin Films, Nicholas Joy Jan 2013

Plasmonic-Based High Temperature Chemical Sensing Using Gold Nanoparticles Embedded In Metal Oxide Thin Films, Nicholas Joy

Legacy Theses & Dissertations (2009 - 2024)

Thin metal oxide films embedded with Au nanoparticles (AuNPs) have been investigated as high temperature localized surface plasmon resonance (LSPR) based sensing materials to monitor H2, CO, and NO2 at a temperature of 500°C. Applications for this technology include turbine engines as well as other combustion environments where it is important to monitor emission gases for both regulatory purposes as well as combustion control. These high temperature applications, which may be oxidizing or reducing in nature, present challenges to sensor reliability and selectivity, and have therefore necessitated the development of novel sensing devices. While there has been …

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Impacts Of Ion Irradiation On Hfo2-Based Resistive Random Access Memory Devices, Xiaoli He Jan 2013

Impacts Of Ion Irradiation On Hfo2-Based Resistive Random Access Memory Devices, Xiaoli He

Legacy Theses & Dissertations (2009 - 2024)

The impacts of ion irradiation on so-called vacancy-change mechanism (VCM) and electrochemical-metallization mechanism (ECM) ReRAM devices based on HfO2 are investigated using various ion sources: H+ (1 MeV), He+ (1 MeV), N+ (1MeV), Ne+ (1.6 MeV) and Ar+ (2.75 MeV) over a range of total doses (105 - 1011 rad(Si)) and fluences (1012 - 1015 cm-2). VCM-ReRAM devices show robust resistive switching function after all irradiation experiments. VCM resistive switching parameters including set voltage (Vset), reset voltage (Vreset), on-state resistance (Ron) and off-state resistance (Roff) exhibited, in most cases, modest changes …

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Understanding Defect Interactions In Si Ultra-Shallow P-N Junctions Formed By Very Low Energy Boron Implantation, Lakshmanan H. Vanamurthy Jan 2013

Understanding Defect Interactions In Si Ultra-Shallow P-N Junctions Formed By Very Low Energy Boron Implantation, Lakshmanan H. Vanamurthy

Legacy Theses & Dissertations (2009 - 2024)

One of the biggest challenges in the scaling of CMOS devices is the formation of a highly activated, abrupt, defect free Source drain extension (SDE) region. This is especially difficult with p-FET's because of the (1) Boron diffusion co-efficient enhancement from Transient enhanced diffusion (TED) and (2) low solid solubility of

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The Effect Of Nanostructure On The Electrical Properties Of Metal Oxide Materials, Philip Zachary Rice Jan 2013

The Effect Of Nanostructure On The Electrical Properties Of Metal Oxide Materials, Philip Zachary Rice

Legacy Theses & Dissertations (2009 - 2024)

Resistive random access memory (ReRAM) is a potential replacement technology for Flash and other memory implementations. Advantages of ReRAM include increased scalability, low power operation, and compatibility with silicon semiconductor manufacturing. Most of the ReRAM devices described to date have utilized thin film based metal oxide dielectrics as a resistive switching matrix. The goal of this dissertation project has been to investigate the resistive switching behavior of nanoparticulate metal oxides and to develop methods to utilize these materials in ReRAM device fabrication. To this end, nanoparticles of TiO2 and HfO2 were synthesized under a variety of conditions resulting …

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Electrical And Optical Characterization Of Carbon Nanotube Diodes, Argyrios Malapanis Jan 2013

Electrical And Optical Characterization Of Carbon Nanotube Diodes, Argyrios Malapanis

Legacy Theses & Dissertations (2009 - 2024)

Carbon nanotubes are good candidates for future applications, including nanoelectronic and nanophotonic devices. Their quasi-one dimensional (1D) character offers appealing device properties. These include reduced carrier scattering, carrier mobility up to two orders of magnitude higher than that of materials used in state-of-the-art computer chips today, current densities rivaling those of the best semiconductors, enhanced optical absorption, and band gaps tunable with tube diameter and doping. Recent breakthroughs in research point to the possibility of placing nanotubes precisely on substrates with densities approaching that of transistors on today's computer chips in a way that's integratable with existing Si-based technology. Such …

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The Effect Of Energy Deposition On Pattern Resolution In Electron Beam Lithography, Ananthan Raghunathan Jan 2013

The Effect Of Energy Deposition On Pattern Resolution In Electron Beam Lithography, Ananthan Raghunathan

Legacy Theses & Dissertations (2009 - 2024)

Electron beam lithography is one of the most important tools for nanofabrication. Electron beam lithography has consistently been able to offer higher resolution, typically better than 10 nm or so, compared to other techniques. In this work the contribution of electron-substrate interaction to pattern resolution is investigated.

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Local Area Mask Patterning Of Extreme Ultraviolet Lithography Reticles For Native Defect Analysis, Adam Lyons Jan 2013

Local Area Mask Patterning Of Extreme Ultraviolet Lithography Reticles For Native Defect Analysis, Adam Lyons

Legacy Theses & Dissertations (2009 - 2024)

Understanding the nature and behavior of native defects on EUV reticles, particularly their printability, is of critical importance to the successful implementation of EUV lithography for high volume manufacturing, as will be demonstrated in the upcoming chapters. Previous defect characterization work has focused on the examination of programmed defects, native defects on blank reticles, and unaligned native defects on patterned reticles. Each of these approaches has drawbacks, which will be discussed in detail, and the aim of this research is to address these deficiencies by developing a method to pattern features of interest over native defects, enabling the direct observation …

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Defining An Optimal Surface Chemistry For Pluripotent Stem Cell Culture In 2d And 3d, Michael Roy Zonca Jr. Jan 2013

Defining An Optimal Surface Chemistry For Pluripotent Stem Cell Culture In 2d And 3d, Michael Roy Zonca Jr.

Legacy Theses & Dissertations (2009 - 2024)

Surface chemistry is critical for growing pluripotent stem cells in an undifferentiated state. There is great potential to engineer the surface chemistry at the nanoscale level to regulate stem cell adhesion. However, the challenge is to identify the optimal surface chemistry of the substrata for ES cell attachment and maintenance. Using a high-throughput polymerization and screening platform, a chemically defined, synthetic polymer grafted coating that supports strong attachment and high expansion capacity of pluripotent stem cells has been discovered using mouse embryonic stem (ES) cells as a model system. This optimal substrate, N-[3-(Dimethylamino)propyl] methacrylamide (DMAPMA) that is grafted on 2D …

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Plasma-Enhanced Atomic Layer Deposition Of Ruthenium-Titanium Nitride Mixed-Phase Layers For Direct-Plate Liner And Copper Diffusion Barrier Applications, Adam James Gildea Jan 2013

Plasma-Enhanced Atomic Layer Deposition Of Ruthenium-Titanium Nitride Mixed-Phase Layers For Direct-Plate Liner And Copper Diffusion Barrier Applications, Adam James Gildea

Legacy Theses & Dissertations (2009 - 2024)

Current interconnect networks in semiconductor processing utilize a sputtered TaN diffusion barrier, Ta liner, and Cu seed to improve the adhesion, microstructure, and electromigration resistance of electrochemically deposited copper that fills interconnect wires and vias. However, as wire/via widths shrink due to device scaling, it becomes increasingly difficult to have the volume of a wire/via be occupied with ECD Cu which increases line resistance and increases the delay in signal propagation in IC chips. A single layer that could serve the purpose of a Cu diffusion barrier and ECD Cu adhesion promoter could allow ECD Cu to occupy a larger …

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Nb Doped Tio2 As A Cathode Catalyst Support Material For Polymer Electrolyte Membrane Fuel Cells, Alexander William O'Toole Jan 2013

Nb Doped Tio2 As A Cathode Catalyst Support Material For Polymer Electrolyte Membrane Fuel Cells, Alexander William O'Toole

Legacy Theses & Dissertations (2009 - 2024)

In order to reduce the emissions of greenhouse gases and reduce dependence on the use of fossil fuels, it is necessary to pursue alternative sources of energy. Transportation is a major contributor to the emission of greenhouse gases due to the use of fossil fuels in the internal combustion engine. To reduce emission of these pollutants into the atmosphere, research is needed to produce alternative solutions for vehicle transportation. Low temperature polymer electrolyte membrane fuel cells are energy conversion devices that provide an alternative to the internal combustion engine, however, they still have obstacles to overcome to achieve large scale …

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Ruco To Extend The Scalability Of Ultra-Thin Direct Plate Liners, Daniel Verne Greenslit Jan 2013

Ruco To Extend The Scalability Of Ultra-Thin Direct Plate Liners, Daniel Verne Greenslit

Legacy Theses & Dissertations (2009 - 2024)

In traditional semiconductor technology a sputtered copper seed layer is used to improve the adhesion, microstucture, and electromigration characteristics of electrochemically deposited (ECD) copper. The seed layer is deposited on top of a Ta/TaN stack. The Ta layer acts as an adhesion and nucleation layer for the copper seed and the TaN serves as a diffusion barrier for the Cu. As the line widths continue to shrink, scaling each of these layers becomes more difficult. It would be advantageous for the interconnect to be composed of as much copper as possible, transitioning from the traditional liner seed stack to a …

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Steam, Electricity & Gas : Historical Perspectives On What We Drive Today And Why, Michael Edward Flinton Jan 2013

Steam, Electricity & Gas : Historical Perspectives On What We Drive Today And Why, Michael Edward Flinton

Legacy Theses & Dissertations (2009 - 2024)

ABSTRACT

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Kernel Density Metric Learning, Yujie He, Wenlin Chen, Yixin Chen Jan 2013

Kernel Density Metric Learning, Yujie He, Wenlin Chen, Yixin Chen

All Computer Science and Engineering Research

This paper introduces a supervised metric learning algorithm, called kernel density metric learning (KDML), which is easy to use and provides nonlinear, probability-based distance measures. KDML constructs a direct nonlinear mapping from the original input space into a feature space based on kernel density estimation. The nonlinear mapping in KDML embodies established distance measures between probability density functions, and leads to correct classification on datasets for which linear metric learning methods would fail. Existing metric learning algorithms, such as large margin nearest neighbors (LMNN), can then be applied to the KDML features to learn a Mahalanobis distance. We also propose …

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Parallel Real-Time Scheduling Of Dags, Abusayeed Saifullah, David Ferry, Jing Li, Kunal Agrawal, Chenyang Lu, Christopher Gill Jan 2013

Parallel Real-Time Scheduling Of Dags, Abusayeed Saifullah, David Ferry, Jing Li, Kunal Agrawal, Chenyang Lu, Christopher Gill

All Computer Science and Engineering Research

Recently, multi-core processors have become mainstream in processor design. To take full advantage of multi-core processing, computation-intensive real-time systems must exploit intra-task parallelism. In this paper, we address the open problem of real-time scheduling for a general model of deterministic parallel tasks, where each task is represented as a directed acyclic graph (DAG) with nodes having arbitrary execution requirements. We prove processor-speed augmentation bounds for both preemptive and non-preemptive real-time scheduling for general DAG tasks on multi-core processors. We first decompose each DAG into sequential tasks with their own release times and deadlines. Then we prove that these decomposed tasks …

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Scanner: An Efficient And Accurate Trimming Tool For Illumina Next Generation Sequencing Reads, Xiang Zhou Jan 2013

Scanner: An Efficient And Accurate Trimming Tool For Illumina Next Generation Sequencing Reads, Xiang Zhou

All Computer Science and Engineering Research

Recent advances in High-Throughput Sequencing (HTS) technology have greatly facilitated the researches in bioinformatics field. With the ultra-high sequencing speed and improved base-calling accuracy, Illumina Genome Analyzer is currently the most widely used platform in the field. To use the raw reads generated from the sequencing machine, the 3’ adapter sequence attached to the real read in the process of ligation needs to be correctly trimmed. This is often done by some inhouse scripts or different packages with various parameters. They either use the Smith-Waterman algorithm or search for an exact match of the 3’ adapter sequence. In this report, …

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Simple Analytic Performance Models For Streaming Data Applications Deployed On Diverse Architectures, Jonathan C. Beard, Roger D. Chamberlain, Mark A. Franklin Jan 2013

Simple Analytic Performance Models For Streaming Data Applications Deployed On Diverse Architectures, Jonathan C. Beard, Roger D. Chamberlain, Mark A. Franklin

All Computer Science and Engineering Research

Modern hardware is inherently heterogeneous. With heterogeneity comes multiple abstraction layers that hide underlying complex systems. While hidden, this complexity makes quantitative performance modeling a difficult task. Designers of high-performance streaming applications for heterogeneous systems must contend with unpredictable and often non-generalizable models to predict performance of a particular application and hardware mapping. This paper outlines a computationally simple approach that can be used to model the overall throughput and buffering needs of a streaming application on heterogeneous hardware. The model presented is based upon a hybrid maximum flow and decomposed discrete queueing model. The utility of the model is …

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Ewa Model With Recency Effect And Limited Memory, Hang Xie Jan 2013

Ewa Model With Recency Effect And Limited Memory, Hang Xie

All Computer Science and Engineering Research

Game theory is an important field in economics; it studies how people make decisions amid conflict and cooperation. Various experiments have been carried to study the way people play those games, and economists study those data for various purposes. There has been a rise of need for using artificial agents to simulate the game, since we could save the cost of hiring human subjects for the experiments, and we could gain more control over the experiment settings.

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Self-Adapting Mac Layer For Wireless Sensor Networks, Mo Sha, Meng Xu, Chenyang Lu, Linh T.X. Phan, Tae-Suk Kim, Taerim Park Jan 2013

Self-Adapting Mac Layer For Wireless Sensor Networks, Mo Sha, Meng Xu, Chenyang Lu, Linh T.X. Phan, Tae-Suk Kim, Taerim Park

All Computer Science and Engineering Research

The integration of wireless sensors with mobile phones is gaining momentum as an enabling platform for numerous emerging applications. These mobile systems face dynamic environments where both application requirements and ambient wireless conditions change frequently. Despite the existence of many MAC protocols however, none can provide optimal performance along multiple dimensions, in particular when the conditions are frequently changing. Instead of pursuing a one-MAC-fit all approach we present a Self-Adapting MAC Layer (SAML) comprising (1) a Reconfigurable MAC Architecture (RMA) that can switch to different MAC protocols at run time and (2) a learning-based MAC Selection Engine that selects the …

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Control In Networked Systems With Fuzzy Logic, Akhan Akbulut, Oğuzhan Öztaş Jan 2013

Control In Networked Systems With Fuzzy Logic, Akhan Akbulut, Oğuzhan Öztaş

Turkish Journal of Electrical Engineering and Computer Sciences

Recently, the development of control systems based on network-based architecture is getting very high attention. Because of its fast data communication, network-based control is in high demand. However, there are some disadvantages, such as delays, data packet dropouts, and communication constraints. Network-based control systems are getting attention in the development of this architecture because of these disadvantages. Optimization of the system is supplied to improve the existing structure. The optimization is categorized into 2 main structures: software optimization and hardware optimization. The structure of the overall system is designed with these optimization strategies. A hierarchical and communicational structure has emerged …

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Gaseous Corrosion In Hard Disk Drive: A Computational Study, Hardik Shah Jan 2013

Gaseous Corrosion In Hard Disk Drive: A Computational Study, Hardik Shah

Mechanical and Aerospace Engineering Theses - Archive

HDD is the largest digitally encoded data storage device. HDD is used to store digital data in data centers, computers and laptops. A typical HDD consists of a casing, an actuator arm, actuator axis, head, platters, power connectors, and jumper pins. The platter is made up of non-magnetic material and is covered by magnetic material, which stores the data. The magnetic heads are mounted on a moving actuator arm to read and write the data. One of the modes of failure of a HDD is corrosion. The parts of the HDD are corroded by coming in contact with the contaminants. …

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Nebraska Summary: S924 Massey Ferguson 7618, Nebraska Tractor Test Lab Jan 2013

Nebraska Summary: S924 Massey Ferguson 7618, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

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The Effect Of Isostatic Pressing On The Dielectric Properties Of Screen Printed Ba0.5Sr0.5Tio3 Thick Films, Siwei Wang, Lingling Zhang, Jiwei Zhai, Fanglin Chen Jan 2013

The Effect Of Isostatic Pressing On The Dielectric Properties Of Screen Printed Ba0.5Sr0.5Tio3 Thick Films, Siwei Wang, Lingling Zhang, Jiwei Zhai, Fanglin Chen

Faculty Publications

Ba0.5Sr0.5TiO3 thick films with B2O3–Li2O glass sintering aid were prepared by the screen printing method on Al2O3 substrates. A 200 MPa isostatic pressure was applied to the films before sintering. After being sintered at 950∘C, lower porosity and denser microstructure was obtained compared with the films without isostatic pressing. The dielectric constant and dielectric loss were 238 and 0.0028, respectively. A tunability of 61.7% was obtained for the isostatic pressed films, a 27.8% enhancement compared to unpressurized films. These results suggest that isostatic pressing …

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Evaluation Of J-Turn Intersection Design Performance In Missouri, Final Report, Praveen Edara Ph.D., P.E., Ptoe, Carlos Sun Ph.D., P.E., Jd, Sawyer Breslow Jan 2013

Evaluation Of J-Turn Intersection Design Performance In Missouri, Final Report, Praveen Edara Ph.D., P.E., Ptoe, Carlos Sun Ph.D., P.E., Jd, Sawyer Breslow

Mid-America Transportation Center: Final Reports and Technical Briefs

Research shows that a high percentage of crashes that take place on high-speed rural expressways occur at intersections with minor roads. One low-cost alternative design for improving the safety of at-grade intersections on such expressways is the J-turn. In the last few years, the Missouri Department of Transportation has converted some two-way stop controlled (TWSC) intersections into J-turns. This study evaluated the effectiveness of the J-turn intersection design in Missouri utilizing field studies, a public survey, crash analysis, and traffic conflict analysis. The field studies collected detailed video data at a J-turn site and a control site. The crash analysis …

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Towards Autonomous Vehicles, Chris Schwarz Ph.D., Geb Thomas Ph.D., Kory Nelson B.S, Michael Mccrary B.S., Nicholas Schlarmann, Matthew Powell Jan 2013

Towards Autonomous Vehicles, Chris Schwarz Ph.D., Geb Thomas Ph.D., Kory Nelson B.S, Michael Mccrary B.S., Nicholas Schlarmann, Matthew Powell

Mid-America Transportation Center: Final Reports and Technical Briefs

We are moving towards an age of autonomous vehicles. Cycles of innovation initiated in the public and private sectors have led one into another since the 1990s; and out of these efforts have sprung a variety of Advanced Driver Assistance Systems and several functioning autonomous vehicles. The challenges that face autonomous vehicle are still significant. There is still technical work to be done to make sensors, algorithms, control schemes, and intelligence more effective and more reliable. As automation in vehicles increases, the associated human factors challenges become more complex. Then, there are a host of socioeconomic issues. Are autonomous vehicles …

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2013 Nebraska Groundwater Quality Monitoring Report Jan 2013

2013 Nebraska Groundwater Quality Monitoring Report

Nebraska Department of Environmental Quality: Reports

The 2001 Nebraska Legislature passed LB329 (Neb. Rev. Stat. §46-1304) which, in part, directed the Nebraska Department of Environmental Quality (NDEQ) to report on groundwater quality monitoring in Nebraska. Reports have been issued annually since December 2001. The text of the statute applicable to this report follows: “The Department of Environmental Quality shall prepare a report outlining the extent of ground water quality monitoring conducted by natural resources districts during the preceding calendar year. The department shall analyze the data collected for the purpose of determining whether or not ground water quality is degrading or improving and shall present the …

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Optimal Thickness Distributions Of Aeroelastic Flapping Shells, Bret Stanford, Philip Beran Jan 2013

Optimal Thickness Distributions Of Aeroelastic Flapping Shells, Bret Stanford, Philip Beran

United States Air Force: Publications

The severe weight limitations of flapping wing micro air vehicles necessitates the use of thin flexible wings, which in turn requires an aeroelastic modeling tool for proper numerical characterization. Furthermore, due to the unconventional nature of these vehicles, wing design guidelines for thrust and/or power considerations are not generally available; numerical design optimization then becomes a valuable tool. This work couples a nonlinear shell model to an unsteady vortex lattice solver, and then computes analytical design gradients: the derivative of aerodynamic force/power quantities with respect to a large vector of thickness variables. Gradient-based optimization is then used to locate the …

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Direct Ignition And S-Curve Transition By In Situ Nano-Second Pulsed Discharge In Methane/Oxygen/Helium Counterflow Flame, Wenting Sun, Sang Hee Won, Timothy Ombrello, Campbell Carter, Yiguang Ju Jan 2013

Direct Ignition And S-Curve Transition By In Situ Nano-Second Pulsed Discharge In Methane/Oxygen/Helium Counterflow Flame, Wenting Sun, Sang Hee Won, Timothy Ombrello, Campbell Carter, Yiguang Ju

United States Air Force: Publications

A well-defined plasma assisted combustion system with novel in situ discharge in a counterflow diffusion flame was developed to study the direct coupling kinetic effect of non-equilibrium plasma on flame ignition and extinction. A uniform discharge was generated between the burner nozzles by placing porous metal electrodes at the nozzle exits. The ignition and extinction characteristics of CH4/O2/He diffusion flames were investigated by measuring excited OH* and OH PLIF, at constant strain rates and O2 mole fraction on the oxidizer side while changing the fuel mole fraction. It was found that ignition and extinction occurred with an abrupt change of …

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Real-Time Multi-Core Virtual Machine Scheduling In Xen, Sisu Xi, Meng Xu, Chenyang Lu, Linh T.X. Phan, Christopher Gill, Olga Sokolsky, Insup Lee Jan 2013

Real-Time Multi-Core Virtual Machine Scheduling In Xen, Sisu Xi, Meng Xu, Chenyang Lu, Linh T.X. Phan, Christopher Gill, Olga Sokolsky, Insup Lee

All Computer Science and Engineering Research

Recent years have witnessed two major trends in the development of complex real-time systems. First, to reduce cost and enhance flexibility, multiple systems are sharing common computing platforms via virtualization technology, instead of being deployed separately on physically isolated hosts. Second, multicore processors are increasingly being used in real-time systems. The integration of real-time systems as virtual machines (VMs) atop common multicore platforms raises significant new research challenges in meeting the real-time performance requirements of multiple systems.

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