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Articles 31 - 44 of 44
Full-Text Articles in Engineering
Investigation Of The Behavior Of Open Cell Aluminum Foam, Patrick J. Veale
Investigation Of The Behavior Of Open Cell Aluminum Foam, Patrick J. Veale
Masters Theses 1911 - February 2014
The study investigates the behavior open cell aluminum foam in scenarios applicable to potential use in structural applications. Behavior was examined through mechanical testing, computer modeling and analytic expressions. Existing assumptions about the foam characteristics that define the elastic properties were expanded to include contributions of axial and shear deformations in addition to bending and were rewritten in terms of the axial and bending stiffness ratios of ligaments. Compressive and tensile tests were performed to gain a measure of the elastic properties of the foam as well as the behavior and failure mechanisms in both loading conditions. The materials used …
Material Characterization And Structural Response Of Historic Truss Bridges, Sean L. Kelton
Material Characterization And Structural Response Of Historic Truss Bridges, Sean L. Kelton
Masters Theses 1911 - February 2014
Historic truss bridges are examined in this thesis through material characterization of wrought iron and structural evaluation of an early 20th century pony truss bridge. The mechanical properties of wrought iron from six 19th century truss bridges were evaluated through mechanical testing that includes hardness and tension tests. The main findings of this work are: 1) That hardness is a poor predictor of yield and ultimate stress but has some ability in screening iron for iron with low ductility, 2) there is a statistically significant difference in the distribution of yield and ultimate stresses between material samples from different bridges, …
Investigation Of 3-D Heat Transfer Effects In Fenestration Products, Sneh Kumar
Investigation Of 3-D Heat Transfer Effects In Fenestration Products, Sneh Kumar
Masters Theses 1911 - February 2014
Buildings in USA consume close to 40% of overall energy used and fenestration products (e.g. windows, doors, glazed-wall etc.) are the largest components of energy loss from buildings. Accurate evaluation of thermal performances of fenestration systems is critical in predicting the overall building energy use, and improving the product performance. Typically, two-dimensional (2-D) heat transfer analysis is used to evaluate their thermal performance as the 3-D analysis is highly complex process requiring significantly more time, effort, and cost compared to 2-D analysis. Another method of evaluation e.g. physical test in a hotbox is not possible for each product as they …
Advanced Blade Testing Methods For Wind Turbines, Puneet Malhotra
Advanced Blade Testing Methods For Wind Turbines, Puneet Malhotra
Masters Theses 1911 - February 2014
This thesis consists of a detailed analysis of different blade testing methods and improvements to a novel concept for tri-axial testing of large wind turbine blades. As the blades are one of the most critical components of the wind turbine, they have to be tested in order to ensure that their specifications are consistent with the actual performance of the blade. It must be demonstrated that the blade can withstand both the ultimate loads and the fatigue loads to which the blade is expected to be subjected during its design service life. There are basically two types of blade testing: …
Route Choice Behavior In A Driving Simulator With Real-Time Information, Hengliang Tian
Route Choice Behavior In A Driving Simulator With Real-Time Information, Hengliang Tian
Masters Theses 1911 - February 2014
This research studies travelers' route choice behavior in a driving simulator with real-time information en-route. We investigate whether travelers plan strategically for real-time information en-route or simply select a fixed path from origin to destination at the beginning of a trip, and whether network complexity and a parallel driving task affect subjects' strategic thinking ability. In this study, strategic thinking refers to a traveler's route choice decision taking into account future diversion possibilities downstream enabled by information at the diversion node. All of the subjects in this study participated in driving-simulator-based tests while half of the subjects participated in additional …
Data Fusion For The Problem Of Protein Sidechain Assignment, Yang Lei
Data Fusion For The Problem Of Protein Sidechain Assignment, Yang Lei
Masters Theses 1911 - February 2014
In this thesis, we study the problem of protein side chain assignment (SCA) given
multiple sources of experimental and modeling data. In particular, the mechanism
of X-ray crystallography (X-ray) is re-examined using Fourier analysis, and a novel
probabilistic model of X-ray is proposed for SCA's decision making. The relationship
between the measurements in X-ray and the desired structure is reformulated in terms
of Discrete Fourier Transform (DFT). The decision making is performed by developing
a new resolution-dependent electron density map (EDM) model and applying
Maximum Likelihood (ML) estimation, which simply reduces to the Least Squares
(LS) solution. Calculation of the …
Earthquake Engineering Simulation With Flexible Cladding System, Jun Jie Li
Earthquake Engineering Simulation With Flexible Cladding System, Jun Jie Li
Masters Theses 1911 - February 2014
This research investigates the interaction between heavy precast cladding units attached to steel framed buildings. Cladding systems are designed as non-structural components and are not expected to contribute to the energy absorption of the primary structure. However, research has indicated that the cladding system may be designed to reduce the response of the primary structure under seismic excitations. The use of flexible connections between the cladding and primary structural frames may be able to provide beneficial effects to the entire structural response. In this study, a series of earthquake engineering simulations were conducted in OPENSEES to analyze the effects of …
The Impact Of Flexibility And Capacity Allocation On The Performance Of Primary Care Practices, Liang Wang
The Impact Of Flexibility And Capacity Allocation On The Performance Of Primary Care Practices, Liang Wang
Masters Theses 1911 - February 2014
The two important metrics for any primary care practice are: (1) Timely Access and (2) Patient-physician Continuity. Timely access focuses on the ability of a patient to get access to a physician as soon as possible. Patient-physician continuity refers to building a strong or permanent relationship between a patient and a specific physician by maximizing patient visits to that physician. In the past decade, a new paradigm called advanced access or open access has been adopted by practices nationwide to encourage physician to “do today’s work today.” However, most clinics still reserve pre-scheduled appointments for long lead-time appointments due to …
Electric Power Market Modeling With Multi-Agent Reinforcement Learning, Nathanael K. Miksis
Electric Power Market Modeling With Multi-Agent Reinforcement Learning, Nathanael K. Miksis
Masters Theses 1911 - February 2014
Agent-based modeling (ABM) is a relatively new tool for use in electric power market research. At heart are software agents representing real-world stakeholders in the industry: utilities, power producers, system operators, and regulators. Agents interact in an environment modeled after the real-world market and underlying physical infrastructure of modern power systems. Robust simulation laboratories will allow interested parties to stress test regulatory changes with agents motivated and able to exploit any weaknesses, before making these changes in the real world. Eventually ABM may help develop better understandings of electric market economic dynamics, clarifying both delineations and practical implications of market …
Terahertz And Microwave Detection Using Metallic Single Wall Carbon Nanotubes, Enrique A. Carrion
Terahertz And Microwave Detection Using Metallic Single Wall Carbon Nanotubes, Enrique A. Carrion
Masters Theses 1911 - February 2014
Carbon nanotubes (CNTs) are promising nanomaterials for high frequency applications due to their unique physical characteristics. CNTs have a low heat capacity, low intrinsic capacitance, and incredibly fast thermal time constants. They can also exhibit ballistic transport at low bias, for both phonons and electrons, as evident by their fairly long mean free paths. However, despite the great potential they present, the RF behavior of these nanostructures is not completely understood. In order to explore this high frequency regime we studied the microwave (MW) and terahertz (THz) response of individual and bundled single wall nanotube based devices. This thesis is …
Using Solar Energy, Peter Talmage
Using Solar Energy, Peter Talmage
Science and Engineering Saturday Seminars
• Best energy source for the environment • It’s getting more economical every day • Easy to maintain • Cuts down on foreign oil imports
What Is Transportation Engineering, Michael A. Knodler
What Is Transportation Engineering, Michael A. Knodler
Science and Engineering Saturday Seminars
"The branch of engineering which applies technology, science, and human factors to the planning, design, operations and management of roads, streets, bikeways, highways, their networks, terminals, and abutting lands” The objective is to provide for the safe, rapid, comfortable, efficient, convenient, and environmentally compatible movement of people, goods, and services.
Antibiotics In The Environment, Erik Rosenfeldt
Antibiotics In The Environment, Erik Rosenfeldt
Science and Engineering Saturday Seminars
Issues with Emerging Contaminants in Water
Ethics In Science & Engineering: Redefining Tools & Resources, Michelle S. Goncalves, Jane E. Fountain, Jessica Adamick, Marilyn Billings
Ethics In Science & Engineering: Redefining Tools & Resources, Michelle S. Goncalves, Jane E. Fountain, Jessica Adamick, Marilyn Billings
Ethics in Science and Engineering National Clearinghouse
This report summarizes the main points of discussion of a national workshop convened to advance knowledge and practice for ethics in science and engineering. Following the enactment of the America COMPETES Act and its provisions to increase attention to ethics and the responsible conduct of research in science and engineering, the National Science Foundation (NSF) supported two beta site projects to advance understanding of the key dimensions required for a national online clearinghouse in ethics for science and engineering. The ESENCe Beta Site project, based at UMass Amherst and one of two such beta sites in the United States, thanks …