Microstructure And Mechanical Properties At Different Length Scales And Strain Rates Of Nanocrystalline Tantalum Produced By High-Pressure Torsion,
2011
University of North Carolina at Charlotte
Microstructure And Mechanical Properties At Different Length Scales And Strain Rates Of Nanocrystalline Tantalum Produced By High-Pressure Torsion, Q. Wei, Z. L. Pan, X. L. Wu, B. E. Schuster, L. J. Kecdkes, R. Z. Valiev
United States Army: Publications
Fully dense, nanocrystalline tantalum (average grain size as small as ~40 nm) has been processed for the first time by high-pressure torsion. High-resolution transmission electron microscopy reveals non-equilibrium grain boundaries and grains decorated with high-density dislocations. Microhardness measurements and instrumented nanoindentation experiments indicate that the mechanical property is quite uniform except for the central area of the disks. Nanoindentation experiments at different strain rates suggest that the strain rate sensitivity of nanocrystalline tantalum is increased compared to the coarse- and ultrafine-grained counterparts and is accompanied by an activation energy of the order of a few ~b3 (b is the magnitude …
Self Learning Strategies For Experimental Design And Response Surface Optimization,
2011
Wayne State University
Self Learning Strategies For Experimental Design And Response Surface Optimization, Adel Alaeddini
Wayne State University Dissertations
Most preset RSM designs offer ease of implementation and good performance over a wide range of process and design optimization applications. These designs often lack the ability to adapt the design based on the characteristics of application and experimental space so as to reduce the number of experiments necessary. Hence, they are not cost effective for applications where the cost of experimentation is high or when the experimentation resources are limited. In this dissertation, we present a number of self-learning strategies for optimization of different types of response surfaces for industrial experiments with noise, high experimentation cost, and requiring high …
Novel Models And Algorithms For Systems Reliability Modeling And Optimization,
2011
Wayne State University
Novel Models And Algorithms For Systems Reliability Modeling And Optimization, Dingzhou Cao
Wayne State University Dissertations
Recent growth in the scale and complexity of products and technologies in the defense and other industries is challenging product development, realization, and sustainment costs. Uncontrolled costs and routine budget overruns are causing all parties involved to seek lean product development processes and treatment of reliability, availability, and maintainability of the system as a true "design parameter". To this effect, accurate estimation and management of the system reliability of a design during the "earliest stages" of new product development is not only critical for managing product development and manufacturing costs but also to control life cycle costs (LCC). In this …
Hazard Rate Models For Early Warranty Issue Detection Using Upstream Supply Chain Information,
2011
Wayne State University
Hazard Rate Models For Early Warranty Issue Detection Using Upstream Supply Chain Information, Chongwen Zhou
Wayne State University Dissertations
This research presents a statistical methodology to construct an early automotive warranty issue detection model based on upstream supply chain information. This is contrary to extant methods that are mostly reactive and only rely on data available from the OEMs (original equipment manufacturers). For any upstream supply chain information with direct history from warranty claims, the research proposes hazard rate models to link upstream supply chain information as explanatory covariates for early detection of warranty issues. For any upstream supply chain information without direct warranty claims history, we introduce Bayesian hazard rate models to account for uncertainties of the explanatory …
Digital Holographic Imaging Of Aerosol Particles In Flight,
2011
US Army Research Laboratory
Digital Holographic Imaging Of Aerosol Particles In Flight, Matthew J. Berg, Gorden Videen
United States Army: Publications
This work describes the design and application of an apparatus to image aerosol
particles using digital holography in a flow-through, contact-free manner. Particles in an aerosol stream are illuminated by a triggered, pulsed laser and the pattern produced by the interference of this light with that scattered by the particles is recorded by a digital camera. The recorded pattern constitutes a digital hologram from which an image of the particles is computationally reconstructed using a fast Fourier transform. This imaging is validated using a cluster of ragweed pollen particles. Examples involving mineral-dust aerosols demonstrate the technique’s in situ imaging capability …
Application Of Hyperspectral Vegetation Indices To Detect Variations In High Leaf Area Index Temperate Shrub Thicket Canopies,
2011
Virginia Commonwealth University
Application Of Hyperspectral Vegetation Indices To Detect Variations In High Leaf Area Index Temperate Shrub Thicket Canopies, Steven T. Brantley, Julie C. Zinnert, Donald R. Young
United States Army: Publications
Accurate measurement of leaf area index (LAI), an important characteristic of plant canopies directly linked to primary production, is essential for monitoring changes in ecosystem C stocks and other ecosystem level fluxes. Direct measurement of LAI is labor intensive, impractical at large scales and does not capture seasonal or annual variations in canopy biomass. The need to monitor canopy related fluxes across landscapes makes remote sensing an attractive technique for estimating LAI. Many vegetation indices, such as Normalized Difference Vegetation Index (NDVI), tend to saturate at LAI levels >4 although tropical and temperate forested ecosystems often exceed that threshold. Using …
Purification Of A Recombinant Heavy Chain Fragment C Vaccine Candidate Against Botulinum Serotype C Neurotoxin [Rbontc(HC)] Expressed In Pichia Pastoris,
2011
Novartis Animal Health US Inc.
Purification Of A Recombinant Heavy Chain Fragment C Vaccine Candidate Against Botulinum Serotype C Neurotoxin [Rbontc(HC)] Expressed In Pichia Pastoris, Michael P. Dux, Jicai Huang, Rick Barent, Mehmet Inan, S. Todd Swanson, Jayanta Sinha, John T. Ross, Leonard A. Smith, Theresa J. Smith, Ian Henderson, Michael M. Meagher
United States Army: Publications
A purification process for the manufacture of a recombinant C-terminus heavy chain fragment from botulinum neurotoxin serotype C [rBoNTC(Hc)], a potential vaccine candidate, has been defined and successfully scaled-up. The rBoNTC(Hc) was produced intracellularly in Pichia pastoris X-33 using a three step fermentation process, i.e., glycerol batch phase, a glycerol fed-batch phase to achieve high cell densities, followed by a methanol induction phase. The rBoNTC(Hc) was captured from the soluble protein fraction of cell lysate using hydrophobic charge induction chromatography (HCIC; MEP HyperCel™), and then further purified using a CM 650M ion exchange chromatography …
The Role Of Conflict Management On Virtual Team Performance And Satisfaction,
2011
Old Dominion University
The Role Of Conflict Management On Virtual Team Performance And Satisfaction, Pilar Pazos, Anil Ustun, Rolando Delaguila
Engineering Management & Systems Engineering Faculty Publications
The role that input factors from project planning processes play on conflict emergence and conflict resolution in virtual teams is not well understood. Of particular interest for this paper is the role that factors during planning stages play in preventing interpersonal conflict, supporting conflict resolution and ultimately enhancing team outcomes in virtual team settings. This study examines the relationships among commitment to team goals, conflict management and team outcomes in virtual teams. First we provide an in depth review of relevant empirical findings. Next, we describe a study examining the relationships between three sets of variables: 1) goal commitment, 2) …
Process Modeling System For Press Cure, Closed-Cavity Tooled Thick Composites,
2011
University of Texas at Arlington
Process Modeling System For Press Cure, Closed-Cavity Tooled Thick Composites, Arven H. Saunders
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Thick structural composite parts often use press curing with closed-cavity tooling for achieving dimensional tolerances. A commonly encountered defect for these parts is fiber waviness, whick limits its structural strength. The yield for such parts often suffers due to trial and error methods used to develop successful cure processes. In addition, yield for these parts suffers due to material variation. The objectives of this research were to: develop and validate a simplified yet practical cure process model for press cured thick composite parts, utilize the model in order to seek time-efficient optimized cure processes, investigate the effects of material variation …
Improving Throughput And Predictability Of High-Volume Business Processes Through Embedded Modeling,
2011
University of Central Florida
Improving Throughput And Predictability Of High-Volume Business Processes Through Embedded Modeling, Joseph S. Dekeyrel
Electronic Theses and Dissertations
Being faster is good. Being predictable is better. A faithful model of a system, loaded to reflect the system's current state, can then be used to look into the future and predict performance. Building faithful models of processes with high degrees of uncertainty can be very challenging, especially where this uncertainty exists in terms of processing times, queuing behavior and re-work rates. Within the context of an electronic, multi-tiered workflow management system (WFMS) the author builds such a model to endogenously quote due dates. A WFMS that manages business objects can be recast as a flexible flow shop in which …
Models For Evaluation Of Supply Chain Risk With Application To Healthcare Management,
2011
University of Texas at Arlington
Models For Evaluation Of Supply Chain Risk With Application To Healthcare Management, Ford Guangfu Zeng
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Over the past two decades, supply chain management has come to be a key component of organization competitiveness and effectiveness. In the same period, most organizations have put a great deal of effort into improving their own and their supplier's supply chain performance. To a large extent, much of this effort has been aimed at improving the efficiency of supply chain operations. However, organizations have ignored or played down the risks from supply chain disruptions when developing supply strategies, which focus on cost reduction. It is proposed, therefore, that one such standard measure should measure the risk involved with organizations …
Mathematical Optimization Techniques For Managing Selective Catalytic Reduction For Coal-Fired Power Plants,
2011
University of Texas at Arlington
Mathematical Optimization Techniques For Managing Selective Catalytic Reduction For Coal-Fired Power Plants, Passakorn Phananiramai
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Coal is one of the most important energy sources in the U.S. However, it is also one of the biggest air polluters where the major emissions generated from coal combustion are oxides of nitrogen (NOx). NOx leads to ozone formation and make people more susceptible to respiratory illness. The US Environmental Protection Agency (EPA) has steadily tightened the regulation for NOx emissions that can be discharged into the atmosphere. Many techniques and technologies can all assist with NOx removal. However, to meet upcoming EPA mandates, more aggressive technique such as Selective Catalytic Reduction (SCR) is highly recommended. SCR is an …
Design Of The Layout Of A Manufacturing Facility With A Closed Loop Conveyor With Shortcuts Using Queueing Theory And Genetic Algorithms,
2011
University of Central Florida
Design Of The Layout Of A Manufacturing Facility With A Closed Loop Conveyor With Shortcuts Using Queueing Theory And Genetic Algorithms, Vernet Michael Lasrado
Electronic Theses and Dissertations
With the ongoing technology battles and price wars in today's competitive economy, every company is looking for an advantage over its peers. A particular choice of facility layout can have a significant impact on the ability of a company to maintain lower operational expenses under uncertain economic conditions. It is known that systems with less congestion have lower operational costs. Traditionally, manufacturing facility layout problem methods aim at minimizing the total distance traveled, the material handling cost, or the time in the system (based on distance traveled at a specific speed). The proposed methodology solves the looped layout design problem …
A Model To Integrate Sustainability Into The User-Centered Design Process,
2011
University of Central Florida
A Model To Integrate Sustainability Into The User-Centered Design Process, Adrienne Shevonne Brown
Electronic Theses and Dissertations
With concerns for the environment becoming more prevalent in business and the government, it is increasingly important to re-evaluate and update processes to include sustainability considerations early in the design process. In response to this charge, this research effort was designed to integrate sustainability factors into the usercentered design process. The results of this research highlight the benefits of sustainability requirement planning, as well as those derived from integrating sustainability into the current user-centered design model
A Framework For Quantifying Sustainability Of Lean Implementation In Healthcare Organizations,
2011
University of Central Florida
A Framework For Quantifying Sustainability Of Lean Implementation In Healthcare Organizations, Haitham Ahmed Bahaitham
Electronic Theses and Dissertations
Due to the remarkable positive effect of lean adoption in various firms in the manufacturing sector, it has been adopted by several organizations within the healthcare industry. Although the rate of adopting lean by hospitals in the developed countries is slower than it should be, it proved to be effective in helping healthcare organizations maintain or even improve their quality of care while containing their related costs. However, such adoption did not take place until the beginning of the new millennium. And with such adoption, it has been accompanied with major challenges related to proper lean implementation, sustainability of achieved …
Dynamic Routing On Stochastic Time-Dependent Networks Using Real-Time Information,
2011
Wayne State University
Dynamic Routing On Stochastic Time-Dependent Networks Using Real-Time Information, Ali R. Guner
Wayne State University Dissertations
In just-in-time (JIT) manufacturing environments, on-time delivery is one of the key performance measures for dispatching and routing of freight vehicles. Both the travel time delay and its variability impact the efficiency of JIT logistics operations, that are becoming more and more common in many industries, and in particular, the automotive industry. In this dissertation, we first propose a framework for dynamic routing of a single vehicle on a stochastic time dependent transportation network using real-time information from Intelligent Transportation Systems (ITS). Then, we consider milk-run deliveries with several pickup and delivery destinations subject to time windows under same network …
Modeling And Surveillance Of Pandemic Influenza Outbreaks,
2011
University of South Florida
Modeling And Surveillance Of Pandemic Influenza Outbreaks, Diana Prieto
USF Tampa Graduate Theses and Dissertations
Pandemic outbreaks are unpredictable as to their virus strain, transmissibility, and impact on our quality of life. Hence, the decision support models for mitigation of pandemic outbreaks must be user-friendly and operational, and also incorporate valid estimates of disease transmissibility and severity. This dissertation research is aimed at 1) reviewing the existing pandemic simulation models to identify their implementation gaps with regard to usability and operability, and suggesting research remedies, 2) increasing operability of simulation models by calibrating them via an epidemiological model that estimates infection probabilities using viral shedding profiles of concurrent pandemic and seasonal influenza, and 3) developing …
Cap-And-Trade Modeling And Analysis For Electric Power Generation Systems,
2011
University of South Florida
Cap-And-Trade Modeling And Analysis For Electric Power Generation Systems, Patricio Rocha
USF Tampa Graduate Theses and Dissertations
Cap-and-trade is the most discussed CO2 emissions control scheme in the U.S. It is a market-based mechanism that has been used previously to successfully reduce the levels of SO2 and NOx emitted by power generators. Since electricity generators are responsible for about 40% of the CO2 emissions in the U.S., the implementation of CO2 cap-and-trade will have a significant impact on electric power generation systems. In particular, cap-and-trade will influence the investment decisions made by power generators. These decisions in turn, will affect electricity prices and demand. If the allowances (or emission permits) created by …
Development Of Risk Uncertainty Factors From Historical Nasa Projects,
2011
Old Dominion University
Development Of Risk Uncertainty Factors From Historical Nasa Projects, Tahani R. Amer
EMSE Doctoral Projects
NASA is a good investment of federal funds and strives to provide the best value to the nation. NASA has consistently budgeted to unrealistic cost estimates, which are evident in the cost growth in many of its programs. In this investigation, NASA has been using available uncertainty factors from the Aerospace Corporation, Air Force, and Booz Allen Hamilton to develop projects' risk posture. NASA has no insight into the developmental of these factors and, as demonstrated here, this can lead to unrealistic risks in many NASA Programs and projects (P/p). The primary contribution of this project is the development of …
Mixed Integer Programming Models For Selecting Ground-Level Ozone Control Strategies,
2011
University of Texas at Arlington
Mixed Integer Programming Models For Selecting Ground-Level Ozone Control Strategies, Wei-Che Hsu
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Under the Clean Air Act (CAA) in 1990, the U.S Environmental Protection Agency (EPA) was required to set National Ambient Air Quality Standards (NAAQS) for six common air pollutants that are considered harmful to public health and the environment. Ground–level ozone was one of the six criteria pollutants monitored by the EPA and considered the most widespread health threat. Two precursors of ground level ozone are nitrogen oxides (NOx) and volatile organic compounds (VOC) and the common sources of these two precursors include on–road vehicles, non–road engines, area sources, point sources, and biogenic and miscellaneous sources. An area …
