Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Civil and Environmental Engineering (306)
- Mechanical Engineering (194)
- Electrical and Computer Engineering (179)
- Civil Engineering (162)
- Engineering Science and Materials (140)
-
- Biomedical Engineering and Bioengineering (119)
- Engineering Mechanics (114)
- Environmental Engineering (114)
- Materials Science and Engineering (105)
- Computer Engineering (78)
- Operations Research, Systems Engineering and Industrial Engineering (63)
- Physical Sciences and Mathematics (50)
- Industrial Engineering (39)
- Chemical Engineering (27)
- Computer-Aided Engineering and Design (24)
- Environmental Sciences (21)
- Life Sciences (21)
- Other Mechanical Engineering (19)
- Structural Engineering (19)
- Manufacturing (17)
- Medicine and Health Sciences (17)
- Computer Sciences (16)
- Power and Energy (16)
- Robotics (16)
- Social and Behavioral Sciences (16)
- Applied Mechanics (15)
- Automotive Engineering (15)
- Bioresource and Agricultural Engineering (15)
- Electrical and Electronics (14)
- Keyword
-
- Optimization (16)
- Design (15)
- Bioremediation (12)
- Packaging (12)
- Machine Learning (11)
-
- Sustainability (10)
- Simulation (9)
- Modeling (7)
- Robotics (7)
- Biodegradation (6)
- Computer Vision (6)
- Concrete (6)
- Fiber (6)
- Finite Element Analysis (6)
- Glass (6)
- Manufacturing (6)
- Adsorption (5)
- Artificial Intelligence (5)
- Automation (5)
- Deep Learning (5)
- Drone (5)
- Dynamics (5)
- Honeycomb (5)
- Masonry (5)
- Nanoparticles (5)
- Radiation (5)
- Remediation (5)
- Scheduling (5)
- TCE (5)
- Tissue engineering (5)
Articles 1051 - 1080 of 1237
Full-Text Articles in Engineering
Non-Linear Finite Element Analysis And Optimization For Light Weight Design Of An Automotive Seat Backrest, Prasanna Balaji Thiyagarajan
Non-Linear Finite Element Analysis And Optimization For Light Weight Design Of An Automotive Seat Backrest, Prasanna Balaji Thiyagarajan
All Theses
ABSTRACT
With the goal of reduced weight, free-size finite element based optimization with constraints on stresses and displacements of a commercially available automotive seat backrest frame manufactured from several stamped and welded low carbon ductile steel sheets is performed using OptiStruct linear optimization package from Altair under the loading requirements of mandatory ECE R-17 backrest-moment test and headrest test for vehicles sold in Europe. In the free-size optimization, sheet metal thickness in a finite element shell model of the backrest frame are design variables with stress and displacement limits as the constraints, with an objective to minimize mass. Using the …
Thermal And Structual Properties Of Candidate Moldable Glass Types, Scott Gaylord
Thermal And Structual Properties Of Candidate Moldable Glass Types, Scott Gaylord
All Theses
This thesis contains results of our efforts to develop a method for defining key glass material properties that must be known and modeled for the design and experimental validation of a precision glass molding (PGM) process for optical glasses. Viscosity, calorimetric, and thermal expansion properties of two commercial glass types N-BK7 and P-SK57 of SCHOTT were characterized to establish a proof-of-concept protocol for the experimental determination of meaningful material properties. Experimental results were determined in order to be incorporated into a computational model predicting final glass size and shape following a molding cycle. Experimental methods were confirmed on the two …
Contingency Analysis Using Synchrophasor Measurements, Megan Vutsinas
Contingency Analysis Using Synchrophasor Measurements, Megan Vutsinas
All Theses
The rapid progress of synchrophasor technology greatly promotes many applications of wide-area measurement systems. Traditionally, contingency analysis is based on off-line studies conducted long in advance. This is becoming increasingly unreliable for real-time operations. New technologies, which rely on accurate, high resolution, and real-time monitoring of actual system conditions using phasor measurements are needed to support the real-time operations. In this research an algorithm is developed, using phasor measurements, that allows real-time analysis and correction of contingencies in power systems. The focus is specifically on overloaded lines. An off-line study performed with POWERWORLD software is used for contingency analysis, and …
Crumb Rubber As A Sorption Medium For Ethylbenzene In Aqueous Solution, Carmen Grayson
Crumb Rubber As A Sorption Medium For Ethylbenzene In Aqueous Solution, Carmen Grayson
All Theses
Scrap tires have always been an environmental concern. In 2005, more than 299 million scrap tires were generated in the U.S., 259 million of which were utilized in the end-use scrap tire markets such as: tire-derived fuel generation, civil engineering applications, and ground rubber applications. The different applications and usages in the scrap tire market have helped utilize up to 87% of annually generated scrap tires in the U.S. Sixteen percent of the scrap tires were utilized in civil engineering applications in 2005 because of their beneficial properties for vibration and sound control, lightweight fill, drainage and collection for underground …
Spatial Variability Of Radionuclide Distribution Coefficients At The Savannah River Site And The Sub-Surface Transport Implications, Kelly Grogan
All Theses
Distribution coefficients, Kd, were measured for a suite of gamma-emitting radionuclides in uncontaminated soils from the E-Area burial grounds at the Savannah River Site. The objectives of the study were to (1) characterize the spatial variability of Kd, (2) evaluate the effect of spatial variability on vadose zone transport, and (3) develop statistical models for predicting Kd from physical or chemical characteristics.
Equilibrium batch sorption tests were performed on 27 soil samples collected from depths ranging from 11 ft to 100 ft from the BGO-3A core with 241Am, 109Cd, 139Ce, 137Cs, 57Co, 60Co, 203Hg, 85Sr, and 88Y. Distribution coefficients were …
Laboratory Evaluation Of Polycyclic Aromatic Hydrocarbon Biodegradation At A Former Tar Plant Site, Mihika Baruah
Laboratory Evaluation Of Polycyclic Aromatic Hydrocarbon Biodegradation At A Former Tar Plant Site, Mihika Baruah
All Theses
A former tar plant site in the southeastern
U.S. is one of hundreds across the country that is contaminated with polycyclic
aromatic hydrocarbons (PAHs). The 2007
CERCLA Priority List of Hazardous Substances ranks PAHs as the eighth most
prominent hazardous substance at National Priority List sites. However, benzo(a)pyrene
is the only PAH that is regulated under the Safe Drinking Water Act, with a maximum
contaminant level of 0.2 µg/l. As with most sites, monitored natural
attenuation was the preferred bioremediation approach for this site, assuming
it could be shown that the PAHs were undergoing biodegradation. Field data from the site …
Exploration Of A Carbon Nanotube Anode Gas-Filled Radiation Detector, Landon Pruitt
Exploration Of A Carbon Nanotube Anode Gas-Filled Radiation Detector, Landon Pruitt
All Theses
The primary objective of this study was to design, test, and model the electrostatic field in a gas-filled radiation detector constructed with either a carbon nanotube (CNT) or a CNT array as the anode. Tungsten anodes of 500 to 4μm diameters were used to observe the gradual decrease in operating voltage with a decreasing anode diameter and estimate efficiencies of CNT anodes in a coaxial design. An electrostatic model (Maxwell 3D/2D) was used to model the resulting electric field associated with a single CNT in the coaxial configuration as well as to optimize the pitch (distance between individual CNTs in …
Effect Of Testing Conditions In The Standard Astm C 1567 Test Procedure On Evaluation Of Asr Mitigation Potential Of Fly Ashes, Pavan Seemakurty
Effect Of Testing Conditions In The Standard Astm C 1567 Test Procedure On Evaluation Of Asr Mitigation Potential Of Fly Ashes, Pavan Seemakurty
All Theses
Alkali Silica Reaction (ASR) is a widespread durability problem not only in the United States, but also in many countries across the world. ASR distress in concrete drastically reduces the service life of a structure and as such, there are no effective rehabilitation measures. As a result, the primary strategy to deal with ASR distress has been one of prevention/mitigation in new construction. Various mitigation measures are widely used to reduce the effects of ASR in concrete. Among these measures, the use of supplementary cementing materials (SCMs) is the most commonly employed method. SCMs are believed to mitigate expansions induced …
Assessment Of Potential Site Selection Methods For Use In Prioritizing Safety Improvements On Georgia Roadways, Priyanka Alluri
Assessment Of Potential Site Selection Methods For Use In Prioritizing Safety Improvements On Georgia Roadways, Priyanka Alluri
All Theses
With over 40,000 people continuing to die on US roads each year, the US government has heightened the awareness of critical safety issues with the passage of SAFETEA - LU legislation in 2005. The plan requires each of the states to develop a Strategic Highway Safety Plan (SHSP) and incorporate data-driven approaches to prioritize and evaluate program outcomes; else federal funds will be redirected. Seeking to meet the new demands for data-driven approaches, many states are struggling to identify data collection/maintenance requirements for satisfying new approaches to highway safety analysis. Recent research has shown that selecting projects on the basis …
Scale-Up And Characterization Of An Enrichment Culture For Bioaugmentation Of The P-Area Chlorinated Ethene Plume At The Savannah River Site, Ashley Eaddy
All Theses
Bioaugmentation has become an increasingly popular remediation strategy for groundwater sites contaminated with chlorinated solvents. When biostimulation is not an option due to the lack of necessary microorganisms required for dechlorination of the contaminants, bioaugmentation is an attractive option for remediation. The P-Area groundwater plumes at the Savannah River Site (SRS) are just such a case. The P-Area site is contaminated with tetrachloroethene (PCE), trichloroethene (TCE), and cis-dichloroethene (cDCE), and no dechlorination past cDCE is occurring. A similar site, the C-Area site, is near one of the P-Area site's source zones but displays complete reduction of TCE to ethene. …
Analysis Of Non Load Bearing Two Component (2k) Adhesives; Under The Automotive Hemming Process Variations; Thermogravimetric, Calorimetric And Composition Analyses, Kameswara Nara
All Theses
The work focuses on the analysis of non-load bearing, two component adhesives used in joining the automotive closures. The study is concerned with the thermo-gravimetric and the calorimetric attributes of the 2K adhesive. The study includes the impact of the robotic applicators capability, in terms of the mixing ratio between the resin and the hardener, and the mechanical mixing quality. A Fourier Transform Infrared Spectroscopy (FTIR) procedure analyzes the adhesive chemical groups and tracks the growth and decay of the hydroxyl and epoxy peaks. Additionally, the cure-rate based on a reaction-type, is investigated through a Differential Scanning Calorimetry (DSC). The …
A Regularization Technique For The Analysis Of Photographic Data Used In Chemical Release Wind Measurements, Justin Ingersoll
A Regularization Technique For The Analysis Of Photographic Data Used In Chemical Release Wind Measurements, Justin Ingersoll
All Theses
The neutral winds are a key parameter in the electrodynamics of the ionosphere. The available techniques for measuring vertical neutral wind profiles, especially with good height resolution, are extremely limited. This is especially true with sounding rocket flights as it is not practical to take direct measurements of neutral winds with onboard instruments. Chemical releases from sounding rockets, however, allow such measurements by providing a tracer of the motion of the neutral atmosphere at altitudes in the mesosphere and lower thermosphere (MLT). The resulting chemiluminescent trail is typically photographed from two or more locations to track neutral motions. Triangulation based …
Quantitative Modeling Of Soil Properties Based On Composition And Application To Dynamic Tire Testing, Sumalatha Yaski
Quantitative Modeling Of Soil Properties Based On Composition And Application To Dynamic Tire Testing, Sumalatha Yaski
All Theses
A new dimension of success in automotive supply is time-based competition. This especially comes to light in tire development, with companies striving to enhance the testing methodologies for reduction in development time. Modeling and development of off-road tires is particularly difficult due to a lack of quantitative descriptions of the operating environment for model validation. Off-road tire evaluation is subjective, expensive, site dependent, and testing of such tires is typically carried out under lower levels of control. The objective of this work is to create fundamental descriptions of pertinent composition based soil properties and to directly relate these properties to …
Microcosm Evaluation Of Vinyl Chloride Bio-Oxidation Under Anaerobic Conditions, Jessica High
Microcosm Evaluation Of Vinyl Chloride Bio-Oxidation Under Anaerobic Conditions, Jessica High
All Theses
The vast majority of hazardous waste sites in the US have groundwater contaminated with halogenated organic solvents, primarily tetrachloroethene (PCE) and trichloroethene (TCE). Because the cost to remediate these sites is projected to exceed hundreds of billions of dollars, there is considerable interest in utilizing bioremediation as a low-cost remedy. Under anaerobic conditions, the best characterized biodegradation pathway for chlorinated ethenes is reductive dechlorination, whereby an electron donor such as hydrogen provides the reducing equivalents needed to replace chlorine atoms with hydrogen atoms. The ultimate daughter products from chlorinated ethenes are non-hazardous ethene and ethane, a process easily documented with …
The Role Of Crystallographic Relationships Between Alpha(Α) And Beta(Β) Phases On The Elevated Temperature Isothermal Phase Transformation Kinetics In Timetal Lcb (Ti-6.5mo-4.5fe-1.5al), Basak Kokuoz
All Theses
This investigation has examined the mechanisms controlling the precipitation of various alpha (α) phase morphologies which form during the elevated temperature beta(β)beta(β)+alpha(α) phase transformations in TIMETAL LCB (Ti-6.8Mo-4.5Fe-1.5Al, in wt.%).
Alpha (α) phase precipitation was promoted by aging the TIMETAL LCB specimens in the α+β two phase region. The temperature range considered was between 700-745oC.The specimens were isothermally aged for successively increasing times, starting at 30 seconds until the equilibrium microstructure was achieved. Solution treated and aged TIMETAL LCB specimens were investigated using x-ray diffraction (XRD), optical (OM) and scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) and quantitative image …
Estimating In-Situ Flexural Strength Of Heat-Affected Prestressed Concrete Beams Using Constituent Material Models, Travis Collins
Estimating In-Situ Flexural Strength Of Heat-Affected Prestressed Concrete Beams Using Constituent Material Models, Travis Collins
All Theses
When a prestressed concrete structure is subjected to a severe fire, significant damage is created to the extent that a visual analysis is sufficient in rendering the structure unusable. Although moderate fires also create structural damage, the effects can often not be visually assessed. Therefore, a need exists for a method that allows structures to be evaluated after a fire has occurred and visual observations present no conclusive evidence for making decisions regarding the structural impact of the fire on the structure.
It was assumed that temperature histories of a member arising from a moderate fire can be determined using …
Automated State Change Detection Of A Gaussian Distributed Signal, Anirudh Singh
Automated State Change Detection Of A Gaussian Distributed Signal, Anirudh Singh
All Theses
This work presents a novel approach to detect a change in the state of a signal. The hypothesis is that in a given state, the values of a signal vary in a sub-part of a Gaussian distribution. By modeling a signal using a sub-part of the Gaussian distribution, a quantitative value representing the state of the signal is obtained. This value is monitored with time to detect a change in the state of the signal. The proposed algorithm is implemented and tested on data obtained from a related research.
Investigation Of A Photosynthetically Aerated Cathode In A Mfc, Derek Little
Investigation Of A Photosynthetically Aerated Cathode In A Mfc, Derek Little
All Theses
A microbial fuel cell (MFC) creates an environment that facilitates the conversion of electron donor compounds into electrical current through the oxidizing powers of microbial growth. Within the anode of a MFC bacteria grow oxidizing organic compounds while in the cathode oxygen is reduced. The goal of a MFC is to achieve respiration under anaerobic conditions having electrodes serve as intermediate electron acceptor for bacteria in the anode and shuttle electrons through a circuit to the cathode reducing a terminal electron acceptor.
Waste from the biological production of hydrogen from agricultural peach was explored for use within the anode of …
The Design Of A Data Recorder To Test The Effects Of Color Contrast On 'This Side Up' Pictorial Markings On Package Orientation Within Ups Ground, Rupert Hurley
All Theses
A data recorder was built and qualified to record package orientation over time. The device was then used to observe the effects on package orientation during UPS ground shipping of current and modified ASTM D5445-03 'This Side Up' symbols. Modified symbols on packages demonstrated the effects of contrasting color relationships on symbol noticeability and human compliance. Shipping trials were conducted through UPS distribution centers for cube-shaped packages equipped with custom designed tri-axial accelerometers. Data recorded on 112 shipments provide comparisons of four ASTM D5445-03 'This Side Up' symbols: unmodified, modified blue, modified 'black and white', and control (no symbol). Data …
Three Design Tool Focused Case Studies Of Mechanical Engineering Design Projects, William Miller
Three Design Tool Focused Case Studies Of Mechanical Engineering Design Projects, William Miller
All Theses
Three long term mechanical engineering design projects spanning 24 months, 12 months, and 4 months are examined in this thesis. These projects are used to explore the development of a way to represent information flow throughout the design process with respect to design tools used. This is a first step in a broader effort to formalize 1) modeling of design processes, 2) establishing case study research as a formal approach to design research, and 3) developing new design process tools.
A survey of existing models compares the differences between current approaches and the limitations of each. Inspired by IDEF0, an …
Experimental Framework For The Position Control Of Magnetic Microfibers, Sriram Ravindren
Experimental Framework For The Position Control Of Magnetic Microfibers, Sriram Ravindren
All Theses
Magnetic microfibers have been developed in recent years with potential applications to a large number of fields, from MEMS to microfluidics to bio-chemical analyses. Magnetic microfibers based on polymer material like polypropylene and cellulose has been developed at Clemson University that are hollow cylindrical filaments internally coated with superparamagnetic nanoparticles. This internal coating provides the fiber with magnetic properties that allow them to be externally controlled using magnetic fields from a distance. These fibers can align with the external magnetic fields under constraints imposed by elastic properties and boundary conditions. Current work in this field is primarily focused on the …
Enhancement Of Information Management Capabilities In Mdo Framework, Santosh Hiriyannaiah
Enhancement Of Information Management Capabilities In Mdo Framework, Santosh Hiriyannaiah
All Theses
Multidisciplinary Design Optimization (MDO) frameworks have been developed to facilitate the integration of disciplinary analysis codes and optimization techniques. Recent advances in MDO frameworks have addressed issues related to data exchange, distributed computing, process integration and trade study. However, managing, storing and sharing MDO problem information have not yet been fully addressed. In this research a software configuration is proposed. The configuration is built upon a structured repository, common file system and software applications. The configuration is integrated into a commercially available MDO framework to manage, store and share MDO problem information. A common file system proposed in this research …
Reduction Of Sink Marks In Wire Insert Molded Parts, Gauri Phadke
Reduction Of Sink Marks In Wire Insert Molded Parts, Gauri Phadke
All Theses
Integrating the huge wiring harness network with the plastic trim components found in the car is an attractive way to reduce the vehicle weight. When any foreign object is inserted in an injection molded part, the change in polymer cross section leads to sink marks which are aesthetic defects and are not acceptable for plastic trim components.
In this thesis, a method to minimize or eliminate sink marks for wire insert molded component using injection molding process is presented. L9 Taguchi DOE experimental framework has been employed to study the effect of process parameters, part rib geometry, and the presence …
Assessment Of Fifth Metatarsal Etiology, Daniel Reed
Assessment Of Fifth Metatarsal Etiology, Daniel Reed
All Theses
The fifth metatarsal 'Jones Fracture' is a fracture that occurs 3.5cm distal to the tuberosity. It is an injury that is common in athletes, especially those who participate in sports with a lot of lateral movement. The Jones Fracture is known for its difficulty to heal due to non-union and re-fracture. There has been much research recently regarding in-shoe pressure distributions and their relation to shoe type, movement, and shoe surface interaction. However, only the forces along the bottom of the foot have been investigated. Literature and the direction of fracture seem to implicate a force on the lateral portion …
An Investigative Study Of Patents From An Engineering Design Perspective, Ajit Singh Kanda
An Investigative Study Of Patents From An Engineering Design Perspective, Ajit Singh Kanda
All Theses
Preservation and reuse of valuable design experience aids in the design of new products and processes. Product design repositories are presently being used as a means to preserve and later reuse design knowledge. As such, patent databases such as the United States Patent office and the European Patent Office offer design knowledge in the form of patents. Unfortunately, these sources of novel design solutions do not appear to have been have not been effectively used in the context of engineering design.
In this research, the role of patents in a systematic design process is reviewed understand its utility in the …
Design Process Modeling: Towards An Ontology Of Engineering Design Activities, Pavan Kumar
Design Process Modeling: Towards An Ontology Of Engineering Design Activities, Pavan Kumar
All Theses
An ontology of engineering design activities, called the Design Activity Ontology (DAO), is developed in this research. The DAO models 82 information flows and 25 design activities. These activities cover phases of the design process from conceptual phase through detail design phase. The ontology provides a formalized and structured vocabulary of design activities for consistency and exchange of design process models. The DAO enables design processes to be modeled, analyzed and optimized. The DAO is constructed using information flows identified in current design literature, commonly accepted engineering design textbooks, and an existing activity ontology. Specifically, the DAO is an extension …
Electrokinetic Transport In Micro- And Nano- Channels:A Study Examining Electrokinetic Energy Conversion And Dielectrophoretic Particle Separation, Christian Davidson
Electrokinetic Transport In Micro- And Nano- Channels:A Study Examining Electrokinetic Energy Conversion And Dielectrophoretic Particle Separation, Christian Davidson
All Theses
New micro-fabrication techniques have allowed for the recent development of micro-scale lab on a chip devices which can be utilized for on chip biological analysis as well as electrokinetic energy conversion. This thesis aims to theoretically examine the current thermodynamic efficiency discrepancies in electrokinetic energy conversion devices as well as explore the potential for efficiency increase in a device which supports fluid slip. Also, a micro-fluidic lab on a chip device is fabricated and demonstrated to be capable of continuously separating multiple particles of 1μm, 5μm and 10μm out of a bulk solution. Our device employs a DC dielectrophoretic technique, …
Risedronate Prevents Early Bone Loss Resulting From Whole-Body Irradiation, Eric Livingston
Risedronate Prevents Early Bone Loss Resulting From Whole-Body Irradiation, Eric Livingston
All Theses
Osteoporosis is a condition characterized by a reduction in bone strength resulting in an overall increase in the risk of fracture. There are many factors that contribute to the development of this condition, including ionizing radiation exposure. Declines in bone volume and trabecular micro-architecture have been found following exposure to multiple types of radiation. Past research has implicated reduction of osteoblast function and changes to vasculature as the primary sources of bone deterioration. Recently, an early increase in osteoclast number was observed following exposure to low-energy X-rays, identifying an increase in resorption as a possible cause and potential target for …
Fecal Coliform Source Identification Using Chemical Tracers, Nicole Fahrenfeld
Fecal Coliform Source Identification Using Chemical Tracers, Nicole Fahrenfeld
All Theses
Fecal sterols and fluorinated whitening agents (FWA) were used as chemical tracers for fecal coliform source tracking in Cane and Little Cane creeks in Walhalla, SC. Fecal sterols were quantifiable in both stream sediments and suspended particulates using an extraction, clean-up, and analytical method modified from Isobe et al. (2002) with a N,O-Bis(trimethylsilyl)trifluoroacetamide (BSTFA) derivatization scheme. Only human sterol source identification ratios were able to be calculated using the chosen sterol suite. Human fecal signatures were seen in both the sediment and the water column at various points along both creeks, indicating human fecal pollution is contributing to the fecal …
Estimation Of Vehicle Mass And Road Grade, Tejas Ghotikar
Estimation Of Vehicle Mass And Road Grade, Tejas Ghotikar
All Theses
This thesis describes development of a real-time-implementable algorithm for simultaneous estimation of a heavy vehicle's mass and time-varying road grade and its verification with experimental data. Accurate estimate of a heavy vehicle's mass is critical in several vehicle control functions such as in transmission and stability control. The goal is to utilize the standard signals on a vehicle in a model-based estimation strategy, as opposed to a more costly sensor-based approach. The challenge is that unknown road grade complicates model-based estimation of vehicle mass and therefore the time-varying grade should be estimated simultaneously. In addition an estimate of road grade …