Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

140,061 Full-Text Articles 161,255 Authors 44,573,586 Downloads 289 Institutions

All Articles in Engineering

Faceted Search

140,061 full-text articles. Page 3771 of 3995.

Minimum Cost Content Distribution Using Network Coding: Replication Vs. Coding At The Source Nodes, Shurui Huang, Aditya Ramamoorthy, Muriel Médard 2010 Iowa State University

Minimum Cost Content Distribution Using Network Coding: Replication Vs. Coding At The Source Nodes, Shurui Huang, Aditya Ramamoorthy, Muriel Médard

Electrical and Computer Engineering Conference Papers, Posters and Presentations

Abstract: Consider a large file that needs to be multicast over a network to a given set of terminals. Storing the file at a single server may result in server overload. Accordingly, there are distributed storage solutions that operate by dividing the file into pieces and placing copies of the pieces (replication) or coded versions of the pieces (coding) at multiple source nodes. Suppose that the cost of a given network coding based solution to this problem is defined as the sum of the storage cost and the cost of the flows required to support the multicast. In this work ...


A Computational Fluid Dynamics Feature Extraction Method Using Subjective Logic, Clifton H. Mortensen 2010 Brigham Young University - Provo

A Computational Fluid Dynamics Feature Extraction Method Using Subjective Logic, Clifton H. Mortensen

All Theses and Dissertations

Computational fluid dynamics simulations are advancing to correctly simulate highly complex fluid flow problems that can require weeks of computation on expensive high performance clusters. These simulations can generate terabytes of data and pose a severe challenge to a researcher analyzing the data. Presented in this document is a general method to extract computational fluid dynamics flow features concurrent with a simulation and as a post-processing step to drastically reduce researcher post-processing time. This general method uses software agents governed by subjective logic to make decisions about extracted features in converging and converged data sets. The software agents are designed ...


Wireless Sensor Network Approach To Aeronautical Telemetry, Oluwasegun Babatunde Tinubi 2010 Brigham Young University - Provo

Wireless Sensor Network Approach To Aeronautical Telemetry, Oluwasegun Babatunde Tinubi

All Theses and Dissertations

Wireless sensor networks have become a rapidly growing research field in recent years. They are envisioned to have a wide range of applications in military, environmental and many other fields. We examine the performance of wireless sensor network applications to aeronautical telemetry. To date, test ranges have relied on a single telemetry ground station for the reception of packets from all air borne transmitters. We researched an alternate means of achieving this same goal with fewer resources. It is a well known fact that communication power and bandwidth are the most expensive commodities in wireless communications. The telemetry world is ...


Modeling, Design, And Testing Of Contact-Aided Compliant Mechanisms In Spinal Arthroplasty, Peter Andrew Halverson 2010 Brigham Young University - Provo

Modeling, Design, And Testing Of Contact-Aided Compliant Mechanisms In Spinal Arthroplasty, Peter Andrew Halverson

All Theses and Dissertations

Injury, instrumentation, or surgery may change the functional biomechanics of the spine. Spinal fusion, the current surgical treatment of choice, stabilizes the spine by rigid fixation, reducing spinal mobility at the cost of increased stress at adjacent levels. Recently, alternatives to spinal fusion have been investigated. One such alternative is total disc replacements. The current generation of total disc replacements (TDRs) focuses on restoring the quantity of motion. Recent studies indicate that the moment-rotation response and axis of rotation, or quality of motion (QOM), may have important implications in the health of adjacent segments as well as the health of ...


A New Eulerian-Based Double Continuity Model For Predicting The Evolution Of Pair Correlation Statistics Under Large Plastic Deformations, Sadegh Ahmadi 2010 Brigham Young University - Provo

A New Eulerian-Based Double Continuity Model For Predicting The Evolution Of Pair Correlation Statistics Under Large Plastic Deformations, Sadegh Ahmadi

All Theses and Dissertations

A new model using a double-continuity relation for predicting the evolution of pair-correlation functions (PCFs) is presented. The proposed model was developed using statistical continuum theory and is employed to predict the viscoplastic behavior of polycrystalline materials. This model was built based upon the continuity relations and a double divergence law that guarantees the conservation of both orientation and mass; and also satisfies the field equations (equilibrium, constitutive, and compatibility) at every point of the polycrystalline material throughout the deformation process. In the presented model, motion of particles in the real space and rotation of crystallographic orientations in the Euler ...


Combined Experimental And Theoretical Studies On Methane Photolysis At 121.6 Nm And 248 Nm- Implications On A Program Of Laboratory Simulations Of Titan’S Atmosphere, C. Romanzin, E. Arzoumanian, Et. Es-sebbar, A. Jolly, S. Perrier, M.-C. Gazeau, Y. Bénilan 2010 Paul Scherrer Institute (PSI)

Combined Experimental And Theoretical Studies On Methane Photolysis At 121.6 Nm And 248 Nm- Implications On A Program Of Laboratory Simulations Of Titan’S Atmosphere, C. Romanzin, E. Arzoumanian, Et. Es-Sebbar, A. Jolly, S. Perrier, M.-C. Gazeau, Y. Bénilan

Dr. Et-touhami Es-sebbar

Methane is, together with N2, the main precursor of Titan’s atmospheric chemistry. In our laboratory, we are currently developing a program of laboratory simulations of Titan’s atmosphere, where methane is intended to be dissociated by multiphotonic photolysis at 248 nm. A preliminary study has shown that multiphotonic absorption of methane at 248 nm is efficient and leads to the production of hydrocarbons such as C2H2 (Romanzin et al., 2008). Yet, at this wavelength, little is known about the branching ratios of the hydrocarbon radicals (CH3, CH2 and CH) and their following photochemistry. This paper thus aims at investigating ...


An Examination Of Distributed Hydrologic Modeling Methods As Compared With Traditional Lumped Parameter Approaches, Murari Paudel 2010 Brigham Young University - Provo

An Examination Of Distributed Hydrologic Modeling Methods As Compared With Traditional Lumped Parameter Approaches, Murari Paudel

All Theses and Dissertations

Empirically based lumped hydrologic models have an extensive track record of use where as physically based, multi-dimensional distributed models are evolving for various engineering applications. Despite the availability of high resolution data, better computational resources and robust numerical methods, the usage of distributed models is still limited. The purpose of this research is to establish the credibility and usability of distributed hydrologic modeling tools of the United States Army Corps of Engineers (USACE) in order to promote the extended use of distributed models. Two of the USACE models were used as the modeling tools for the study, with Gridded Surface ...


Framework For E-Business Value Creation: Towards Enhancing The Firms Performance, Philadelphia University 2010 Philadelphia University

Framework For E-Business Value Creation: Towards Enhancing The Firms Performance, Philadelphia University

Philadelphia University, Jordan

No abstract provided.


Application Of A Bayesian Inference Method To Reconstruct Short-Range Atmospheric Dispersion Events, Inanc Senocak 2010 Boise State University

Application Of A Bayesian Inference Method To Reconstruct Short-Range Atmospheric Dispersion Events, Inanc Senocak

Mechanical and Biomedical Engineering Faculty Publications and Presentations

In the event of an accidental or intentional release of chemical or biological (CB) agents into the atmosphere, first responders and decision makers need to rapidly locate and characterize the source of dispersion events using limited information from sensor networks. In this study the stochastic event reconstruction tool (SERT) is applied to a subset of the Fusing Sensor Information from Observing Networks (FUSION) Field Trial 2007 (FFT 07) database. The inference in SERT is based on Bayesian inference with Markov chain Monte Carlo (MCMC) sampling. SERT adopts a probability model that takes into account both positive and zero-reading sensors. In ...


Flexography Printing Performance Of Pla Film, J. Jacobson, Malcom Keif, Xiaoying Rong, Jay Singh, Keith Vorst 2010 California Polytechnic State University - San Luis Obispo

Flexography Printing Performance Of Pla Film, J. Jacobson, Malcom Keif, Xiaoying Rong, Jay Singh, Keith Vorst

Malcolm G. Keif

During the past decade polylactide acid (PLA) polymer has been the subject of numerous researches aimed at comparing it with traditional petroleum based polymers for many packaging applications. PLA is biodegradable and derived from agricultural by-products such as corn starch or other starch-rich substances like maize, sugar or wheat.While PLA is currently being used in many packaging applications with well documented performance, little work has been done comparing printing processes and performance. This study presents PLA printing performance and sustainability findings using the common flexography printing process. Various analytical methods were used to evaluate performance and provide recommendations for ...


Effect Of Relative Density And Stress Level On The Bearing Capacity Of Footings On Sand, D Loukidis, Rodrigo Salgado 2010 University of Cyprus

Effect Of Relative Density And Stress Level On The Bearing Capacity Of Footings On Sand, D Loukidis, Rodrigo Salgado

Lyles School of Civil Engineering Faculty Publications

The design of shallow foundations relies on bearing capacity values calculated using empirical procedures that are based in part on solutions obtained using the method of characteristics, which assumes a soil that is perfectly plastic following an associated flow rule. In this paper the problem of strip and circular footings resting on the surface of a sand layer is analysed using the finite-element method. Analyses are performed using a two-surface plasticity constitutive model that realistically captures the aspects of the mechanical response of sands that are relevant to the bearing capacity problem. In particular, the model accounts for non-associated flow ...


Optical Characterization Of Wide Bandgap Detector-Grade Semiconductors, Ezzat Elshazly 2010 Virginia Commonwealth University

Optical Characterization Of Wide Bandgap Detector-Grade Semiconductors, Ezzat Elshazly

Theses and Dissertations

Wide bandgap semiconductors are being widely investigated because they have the potential to satisfy the stringent material requirements of high resolution, room temperature gamma-ray spectrometers. In particular, Cadmium Zinc Telluride (Cd1-xZnxTe, x~0.1) and Thallium Bromide (TlBr), due to their combination of high resistivity, high atomic number and good electron mobility, have became very promising candidates for use in X- and gamma-ray detectors operating at room temperature. In this study, carrier trapping times were measured in CZT and TlBr as a function of temperature and material quality. Carrier lifetimes and tellurium inclusion densities were measured in detector-grade Cadmium Zinc ...


A Computationally-Assisted Methodology For Rapid Exploration Of Design Possibilities In Conceptual Design, Garrett J. Barnum 2010 Brigham Young University - Provo

A Computationally-Assisted Methodology For Rapid Exploration Of Design Possibilities In Conceptual Design, Garrett J. Barnum

All Theses and Dissertations

One of the most important decisions in the product development process is the selection of a promising design concept because of the large influence it has on the final product. A thorough search for the best design is a significant challenge to designers, who are trying to balance the objective and subjective performance of the designs they create. In this thesis, a computationally-assisted design methodology is developed and used in the early stages of design to more thoroughly search for designs that perform well according to objective physics-based models and subjective designer-specific preference-based models. The method presented herein uses an ...


Hydroxyl-Terminated Poly(Urethane Acrylate) As A Soft Liner In Dental Applications: Synthesis And Characterization, SELDA KESKIN 2010 The Pennsilyvania State University, Department of Chemistry

Hydroxyl-Terminated Poly(Urethane Acrylate) As A Soft Liner In Dental Applications: Synthesis And Characterization, Selda Keskin


ABSTRACT: Hydroxyl-terminated poly(urethane acrylate) s were synthesized for use in biomedical applications. Acrylate end capping via an interesterification reaction was successfully achieved with methacryloyl chloride addition to the hydroxyl ends of the polyurethane at low temperatures. 2,4-Toluene diisocyanate, 1,6-hexane diisocyanate, and methylene diphenyl diisocyanate were used as diisocyanates for urethane synthesis, and they were end-capped with methyl methacrylate and hydroxyethyl methacrylate. The nature of the monomers that we used had an effect on the thermal and morphological properties that were interpreted in terms of the level of hydrogen bonding and the degree of phase separation. The synthesized ...


Control Of Quantized Multi-Agent Systems With Linear Nearest Neighbor Rules: A Finite Field Approach, Shreyas Sundaram, Christosforos N. Hadjicostis 2010 University of Pennsylvania

Control Of Quantized Multi-Agent Systems With Linear Nearest Neighbor Rules: A Finite Field Approach, Shreyas Sundaram, Christosforos N. Hadjicostis

Lab Papers (GRASP)

We study the problem of controlling a multi-agent system where each agent is only allowed to be in a discrete and finite set of states. Each agent is capable of updating its state based on the states of its neighbors, and there is a leader agent in the network that is allowed to update its state in arbitrary ways (within the discrete set) in order to put all agents in a desired state. We present a novel solution to this problem by viewing the discrete states of the system as elements of a finite field. Specifically, we develop a theory ...


A Miniature Energy Harvesting Device For Wireless Sensors In Electric Power System, Rashed H. Bhuiyan, Roger A. Dougal, Mohammod Ali 2010 University of South Carolina - Columbia

A Miniature Energy Harvesting Device For Wireless Sensors In Electric Power System, Rashed H. Bhuiyan, Roger A. Dougal, Mohammod Ali

Faculty Publications

A novel energy harvesting device called the energy coupler is proposed which can provide power to small wireless sensors in a power system. The energy coupler when coupled electromagnetically to a nearby current carrying conductor scavenges ac power from the conductor. The proposed energy coupler converts the harvested ac power into dc using a passive voltage multiplier circuit. The design of the energy coupler is such that the dc power obtained is adequate to charge a miniature 1.2-V rechargeable battery. It is demonstrated that the energy coupler is capable of delivering 10 mW of dc power to a 50-Ω ...


Stretch Magnitude And Frequency-Dependent Actin Cytoskeleton Remodeling In Alveolar Epithelia, Brian Christopher DiPaolo, Guillaume Lenormand,, Jeffrey J. Fredberg, Susan S. Margulies 2010 University of Pennsylvania

Stretch Magnitude And Frequency-Dependent Actin Cytoskeleton Remodeling In Alveolar Epithelia, Brian Christopher Dipaolo, Guillaume Lenormand,, Jeffrey J. Fredberg, Susan S. Margulies

Departmental Papers (BE)

Alveolar epithelial cells (AEC) maintain integrity of the blood-gas barrier with gasket-like intercellular tight junctions (TJ) that are anchored internally to the actin cytoskeleton. We hypothesize that stretch rapidly reorganizes actin (<10 >min) into a perijunctional actin ring (PJAR) in a manner that is dependent on magnitude and frequency of the stretch, accompanied by spontaneous movement of actin-anchored receptors at the plasma membrane. Primary AEC monolayers were stretched biaxially to create a change in surface area (ΔSA) of 12%, 25%, or 37% in a cyclic manner at 0.25 Hz for up to 60 min, or held tonic at 25% ΔSA ...


Biomechanics Of The Toddler Head During Low-Height Falls: An Anthropomorphic Dummy Analysis Laboratory Investigation, Nicole G. Ibrahim, Susan S. Margulies 2010 University of Pennsylvania

Biomechanics Of The Toddler Head During Low-Height Falls: An Anthropomorphic Dummy Analysis Laboratory Investigation, Nicole G. Ibrahim, Susan S. Margulies

Departmental Papers (BE)

OBJECT

Falls are the most common environmental setting for closed head injuries in children between 2 and 4 years of age. The authors previously found that toddlers had fewer skull fractures and scalp/facial soft-tissue injuries, and more frequent altered mental status than infants for the same low-height falls (≤3 ft).

METHODS

To identify potential age-dependent mechanical load factors that may be responsible for these clinical findings, the authors created an instrumented dummy representing an 18-month-old child using published toddler anthropometry and mechanical properties of the skull and neck, and they measured peak angular acceleration during low-height falls (1, 2 ...


Biomechanics Of Toddler Head During Low-Height Falls: An Anthorpomorphic Dummy Analysis, Nicole G. Ibrahim, Susan S. Margulies 2010 University of Pennsylvania

Biomechanics Of Toddler Head During Low-Height Falls: An Anthorpomorphic Dummy Analysis, Nicole G. Ibrahim, Susan S. Margulies

Departmental Papers (BE)

Object. Falls are the most common environmental setting for closed head injuries in children between 2 and 4 years of age. The authors previously found that toddlers had fewer skull fractures and scalp/facial soft-tissue injuries, and more frequent altered mental status than infants for the same low-height falls (≤ 3 ft).
Methods. To identify potential age-dependent mechanical load factors that may be responsible for these clinical findings, the authors created an instrumented dummy representing an 18-month-old child using published toddler anthropometry and mechanical properties of the skull and neck, and they measured peak angular acceleration during low-height falls (1, 2 ...


Assessment Of Climatic Vulnerability In The Upper Thames River Basin: Part 2, Leanna King, Tarana A. Solaiman, Slobodan P. Simonovic 2010 The University of Western Ontario

Assessment Of Climatic Vulnerability In The Upper Thames River Basin: Part 2, Leanna King, Tarana A. Solaiman, Slobodan P. Simonovic

Water Resources Research Report

Increasing greenhouse gas emissions will cause global temperature to rise in the coming years. Understanding the effects of rising temperature on the hydrologic cycle at a local scale is important in order to assess a wide scope of climate change impacts on management of water resources. Coupled Atmosphere-Ocean General Circulation Models (AOGCMs) are state-of-theart in climate change research, predicting the future climate based on plausible emission scenarios. Their spatial and temporal scales are quite large, so the results of their analyses must be brought to a local-scale through a downscaling process. There are several methods for downscaling AOGCM data; however ...


Digital Commons powered by bepress