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2017

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Articles 3751 - 3780 of 8353

Full-Text Articles in Engineering

Manufacturing And Characterization Of A 3d-Printable, Antibacterial, Magnesium Oxide Nanoparticles Reinforced Abs Filament, Saket Thapliyal May 2017

Manufacturing And Characterization Of A 3d-Printable, Antibacterial, Magnesium Oxide Nanoparticles Reinforced Abs Filament, Saket Thapliyal

Mechanical and Aerospace Engineering Theses - Archive

This research work consists of two phases. In phase one it is intended to manufacture an antibacterial 3D printable filament by extruding a solid state mixture of (MgO) nanoparticles (NPs) and Acrylonitrile Butadiene Styrene (ABS) pellets. A single screw extruder was used to extrude ABS pellets containing 0, 0.5, 1, 2 and 4 wt. % MgO NP. This phase deals with manufacturing and testing the filament for mechanical properties, antibacterial properties and 3D printability. On one hand tensile strength, ductility and 3D-printabiliy were observed to decrease with increasing concentrations of MgO NP in ABS matrix, on the other hand the …

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Numerical Analysis Of A Flapping Elliptic Flat Plate In Hover: A Study Of Leading Edge Vortex Dynamics, C. Vivek Nair May 2017

Numerical Analysis Of A Flapping Elliptic Flat Plate In Hover: A Study Of Leading Edge Vortex Dynamics, C. Vivek Nair

Mechanical and Aerospace Engineering Theses - Archive

Flapping flight is an area of research that is gaining a lot of prominence in engineering, especially with the increase in interest in applying the flapping mechanism of natural fliers to small scale MAVs. The ongoing contributions to this field include studies finding optimal wing shape, flap frequency, and flap trajectories. Flapping flight is an unsteady aerodynamic mechanism, and consists of 3 interactive forces: delayed stall, rotational circulation, and wake capture. The dominant lift generating mechanism is the leading edge vortex (LEV). Natural fliers optimize their flap to gain maximize LEV stability. For our research we simulate 2 cases of …

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Experimental And Computational Study Of The Acclimation Of New It Equipment, Neil Johnson Vazhappilly May 2017

Experimental And Computational Study Of The Acclimation Of New It Equipment, Neil Johnson Vazhappilly

Mechanical and Aerospace Engineering Theses - Archive

Acclimation of newly commissioned IT equipment is an important step that is necessary for safe operations. Proper acclimation is required to prevent an unnecessary condensation from forming and causing premature failure in the equipment. Acclimation is particularly important in cold weather shipping where the component or server reaches the destination well below the destination data center’s dew point, resulting in moisture and condensate. Operating the equipment before it acclimates might cause damage, while waiting too long for the equipment to acclimate might cost companies expensive computational time. This study tries to address the issue by studying the various factors that …

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Productivity Improvement And Cost Optimization Of Small And Medium Scale Enterprises, Unmesh Vishwas Tamhankar May 2017

Productivity Improvement And Cost Optimization Of Small And Medium Scale Enterprises, Unmesh Vishwas Tamhankar

Industrial, Manufacturing, and Systems Theses - Archive

Productivity improvement and cost optimization have been a topic of discussion for at least a century. The publication of Fredrick Taylor’s book ‘The Principles of Scientific Management’ in 1911 can be considered as the beginning of the Efficiency movement. Surprisingly, the awareness about the principles of Industrial Engineering is relatively low in many family-owned Small and Medium Scale Enterprises (SMEs). According to a World Bank report, formal SMEs make up 45% of total employment and contribute 33% of GDP in emerging markets. In the USA, SMEs make up for more than 95% of all firms and employ 50% of private …

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A Performance And Visualization Study On Inlet Geometries Of A Cross-Flow Fan., Yoel Tanquero May 2017

A Performance And Visualization Study On Inlet Geometries Of A Cross-Flow Fan., Yoel Tanquero

Electronic Theses and Dissertations

A study was conducted to characterize the flow-field in the suction region of different inlet geometries of a cross-flow fan. The characterization was accomplished by correlating the static performance curves measured for each fan-inlet configuration to the streamline plot obtained using a particle tracking velocimetry (PTV) measurement system at three constant flow rates (25, 40, and 55 CFM). The PTV measurement system used was developed by the author and uses helium bubbles as tracers, an LED light sheet, a slow motion camera, and a Matlab program. Four inlet geometry design variables were defined and independently studied to evaluate the effect …

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Application Of Raman Spectroscopy To Study Of Biological Systems, Neva Agarwala May 2017

Application Of Raman Spectroscopy To Study Of Biological Systems, Neva Agarwala

Graduate Theses/Dissertations

Raman spectroscopy is an important tool of molecular characterization based on inelastic scattering of monochromatic light by molecules. Since Raman spectra reflect unique vibrational properties of materials, the method offers a potential of selective molecular identification. Furthermore, surface-enhanced Raman spectroscopy (SERS) also is capable of a high sensitivity, since inelastic scattering of light from the molecules is strongly enhanced when Raman-active molecules are located close to roughened noble metal surfaces. In this thesis, Raman characterization protocols of liquid biological samples are optimized. Raman spectra of two different cell cultures, yeast cells and HeLa cells, were collected and interpreted. The potentiality …

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Investigations Of Pld Grown Tungsten Oxide Thin Films, Anthony Thomas Pelton May 2017

Investigations Of Pld Grown Tungsten Oxide Thin Films, Anthony Thomas Pelton

Graduate Theses/Dissertations

Pulsed laser deposition (PLD) is a promising technique for creating inexpensive,nanostructured thin films which may lead to structures suitable for photocatalysis. During this study, multiple tungsten oxide thin films were prepared using two types of PLD techniques. The first method was conducted at US Photonics, Springfield, MO, using a femtosecond laser while the second method relied on use of an excimer (nanosecond) laser located at Missouri State University. Films were first deposited on glass using both methods at room temperature. Further study was conducted on thin films deposited on sapphire and silicon deposited at room temperatures and at elevated temperatures. …

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Development Of Many-Body Potential For Deformation Study In Al-Tin Nanolayered Composites, Paul Yaohan Simanjuntak May 2017

Development Of Many-Body Potential For Deformation Study In Al-Tin Nanolayered Composites, Paul Yaohan Simanjuntak

Graduate Theses/Dissertations

A novel interatomic potential of ternary Al-Ti-N has been developed to study the deformation behavior of Al-TiN nanolaminates. The ternary nanolayered Al-TiN composite has attracted a lot of interest due to its combination of strength and ductility. The current analysis on the system has been primarily concentrated on continuum models which are inadequate to explain the key deformation events such as nucleation and interaction of dislocations. Progress in the preferred atomistic approach has been hampered however by the lack of available interatomic potential optimized for the ternary system. I developed a many-body potential based on embedded atomic model (EAM) by …

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Experimental And Theoretical Study Of Vapor Phase Species Above Hot Rocky Exoplanet Analogues, Michal Bulak May 2017

Experimental And Theoretical Study Of Vapor Phase Species Above Hot Rocky Exoplanet Analogues, Michal Bulak

Graduate Theses/Dissertations

With the James Webb Space Telescope and other space-based missions launching in the next few years, the astrophysics community awaits an exciting time. This work is an answer to a call for the laboratory contributions necessary to analyze the data of unprecedented accuracy. I performed a laboratory analysis of an analogue of a hot super earth atmosphere. This type of an extra solar planet has a rocky composition and has extremely high temperature (from 1500˚C – 5000˚C). I performed infrared spectroscopy on the gas phase vapor above a mixture of two binary systems: SiO2 with Al2O3 and CaO with SiO2. …

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Ftir Spectroscopy Of Hot Exoplanets: A First Step In Experimental Procedure And Analysis, Heath Emmanuel Gemar May 2017

Ftir Spectroscopy Of Hot Exoplanets: A First Step In Experimental Procedure And Analysis, Heath Emmanuel Gemar

Graduate Theses/Dissertations

In this thesis, I demonstrate how I constructed a complete experimental package to view FTIR Spectroscopy of constituents that make up hot, rocky exoplanets. I examine in detail the engineering and construction of such a system. Also, I developed a full computational package to analyze spectra in association and relate the analysis to that of real world application. The new system produces reproducible IR spectra on exoplanet analogs and can be used to probe complex chemistry composition at high temperatures.

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Multifunctional Transition Metal Oxide Core Shell Magnetic Nanoparticles, Mahmud Reaz May 2017

Multifunctional Transition Metal Oxide Core Shell Magnetic Nanoparticles, Mahmud Reaz

Graduate Theses/Dissertations

Oxide core-shell nanoparticles (CSNPs) have attracted considerable interest for their multifunctional properties. Luminescent ZnO, ferroelectric BaTiO3, and inverse spinel iron oxide can be exploited to develop magneto-luminescent and multiferroic nanomaterials. The novel sonochemical method has been used to synthesize the nanomaterials. Atomic-scale spectroscopy establishes the core-shell nature and multifunctional properties of the nanomaterials. Magnetic hysteresis (coercivity, remnant, and saturation magnetization) and temperature dependent data indicate the key structural difference between the oxidized and reduced ZnO/iron oxide CSNPs. Variation in the coercive field and remnant and saturation magnetization further confirms the presence of different iron oxides in the shell region. Temperature …

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Analyzing Potential Benefits Of Heat Integration Designs For A Dtbp Production Plant, Paul Stanzione May 2017

Analyzing Potential Benefits Of Heat Integration Designs For A Dtbp Production Plant, Paul Stanzione

Senior Theses

This thesis looks at the implementation of various heat integration designs for a ditertiary butyl peroxide (DTBP) production plant. Heat integration, also known as process integration, is a common industrial practice in the chemical process industry to reduce utility costs. Heat integration is commonly analyzed using pinch technology, which focuses producing a heat exchanger design that pairs hot streams with excess energy with cold streams that need to be heated. These designs usually cut utility costs, but they also require the building of more heat exchangers to place within the process.

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Evaluation And Modeling Of The Different Material Properties Of The Captive And Wild Diets Of Carnivores, Jill Den Outer, Bethany Janos, Elizabeth Mccourt, William Molair May 2017

Evaluation And Modeling Of The Different Material Properties Of The Captive And Wild Diets Of Carnivores, Jill Den Outer, Bethany Janos, Elizabeth Mccourt, William Molair

Senior Theses

Specific to captive BFFs, the most significant changes in cranial morphology are related to an increase in zygomatic arch width. The zygomatic arch region is the area along which the masseter muscle (a critical muscle of mastication for carnivores) is stretched3 . Mechanical stability of muscular tissues has been shown to be closely related to the structural integrity of the surrounding bones. In mice, mechanical unloading of the hind legs has been shown to induce muscular atrophy, which led to increased porosity and fragmentation in the femur and tibia4. As less force is required for a captive ferret to fully …

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Cost-Effective Monitoring Of Railroad Bridge Performance, Jose Alberto Gomez Romero Salazar May 2017

Cost-Effective Monitoring Of Railroad Bridge Performance, Jose Alberto Gomez Romero Salazar

Civil Engineering ETDs

The railroad network carries 40 % of the freight in the US. Railroad bridges are the most critical part of the network and they need to be properly maintained for safety of operations. Railroad managers need to inspect the bridges in order to assess their structural condition. Railroad managers are interested in measuring displacements under train crossing events to prioritize their bridge management and safety decisions. However, bridge displacements are difficult to collect in the field, because they require a fixed reference from where to measure. Accelerations can be used to estimate dynamic displacements but to this date, the pseudo-static …

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Subcontracting And The Survival Of Plants In The Road Construction Industry: A Panel Quantile Regression Analysis, Dakshina G. De Silva, Georgia Kosmopoulou, Carlos Lamarche May 2017

Subcontracting And The Survival Of Plants In The Road Construction Industry: A Panel Quantile Regression Analysis, Dakshina G. De Silva, Georgia Kosmopoulou, Carlos Lamarche

Economics Faculty Publications

This paper investigates how subcontracting parts of contracted work shapes entrants’ success and survival. We find that newly developed quantile regression approaches can be adapted to study survival of firms competing for government contracts in road construction. The method is applied on a data set that includes patterns of firm entry, exit and auction related information. We find an apparent increase in the business life of firms who subcontract out part of their projects. In Texas, these subcontracting effects appear to be more pronounced for firms with few or no options outside the industry, and among firms who contract out …

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Developing Hybrid Thickness-Accommodation Techniques For New Origami-Inspired Engineered Systems, Kyler Austin Tolman May 2017

Developing Hybrid Thickness-Accommodation Techniques For New Origami-Inspired Engineered Systems, Kyler Austin Tolman

Theses and Dissertations

Origami has become a source of inspiration in a number of engineered systems. In most systems, non-paper materials where material thickness is non-negligible is required. In origami-inspired engineered systems where thickness is non-negligible, thickness-accommodation techniques must be utilized to overcome the issue of self-intersection. Many thickness-accommodation techniques have been developed for use in thick-origami-inspired-engineered systems. In this work several thickness-accommodation techniques are reviewed and discussed. New thickness-accommodation techniques including hybrid thickness-accommodation techniques and the split vertex technique are presented and discussed. These techniques enable new capabilities of thickness-accommodation in origami adapted design. Thickness-accommodation techniques have been developed in the context …

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Optical Imaging Of Metabolic Adaptability As A Biomarker For Metastatic Potential In Breast Cancer Cells, Mason G. Harper May 2017

Optical Imaging Of Metabolic Adaptability As A Biomarker For Metastatic Potential In Breast Cancer Cells, Mason G. Harper

Biomedical Engineering Undergraduate Honors Theses

Breast cancer metastasis is the main cause for mortality in breast cancer patients. However, knowledge of metastatic recurrence is limited, and there is a need to understand metastatic recurrence in order to treat breast cancer patients more effectively. Highly invasive metastatic breast cancer has shown to exhibit metabolic adaptability, transitioning from glycolysis to oxidative phosphorylation in the presence of microenvironmental stress. NADH and FAD are naturally occurring cofactor products during glycolysis and oxidative phosphorylation, respectively, and they are of particular importance during these metabolic processes due to their endogenous fluorescence. Measuring the ratio of fluorescence intensities of these cofactors through …

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Age's Effect On Regenerative Capabilities Of Myocytes Through Satellite Cell Analysis, Karam S. Sra May 2017

Age's Effect On Regenerative Capabilities Of Myocytes Through Satellite Cell Analysis, Karam S. Sra

Biomedical Engineering Undergraduate Honors Theses

The objective of this study was to investigate potential effects aging had on muscle fiber area and satellite cell count in myocytes. This research could help elucidate the detrimental effect age has on regenerative capabilities whether in terms of satellite cell function or satellite cell number. Satellite cells are primarily responsible for generating new muscle tissue after being activated through mechanotransduction of injury. This study utilized immunofluorescence to examine the presence of the PAX7 gene expression, a unique marker of satellite cells, within a 12 month and 18 month old population of mice. The PAX7 marker was co-stained with DAPI …

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Influence Of Relative Density And Microstructural Anisotropy On The Global Elastic Properties Of Cellular Structures, Justin Compton May 2017

Influence Of Relative Density And Microstructural Anisotropy On The Global Elastic Properties Of Cellular Structures, Justin Compton

Mechanical and Aerospace Engineering Theses - Archive

The favorable strength-to-weight ratio of cellular solids makes them ideal for structural applications. With the advent of additive manufacturing, the fabrication of complex cellular structures is becoming a reality. It is therefore necessary to understand the mechanical properties of cellular structures. The global mechanical properties of cellular structures are governed by geometry and therefore, differ from the mechanical properties of the base material from which they are constructed. In this study, finite element models are developed to explore the effective elastic properties of honeycomb structures for isotropic and anisotropic microstructural material properties. Finite element models are generated for regular, hexagonal …

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Risk Assessment And Analysis Of Pharmaceutical Industry Due To Recalls, Sowmya Dinamani Rao May 2017

Risk Assessment And Analysis Of Pharmaceutical Industry Due To Recalls, Sowmya Dinamani Rao

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

In the past five years, there have been 5900 recalls of drugs by the U.S. Food and Drug Administration (FDA) which created distraught consumers and shareholders of pharmaceutical companies. In addition, recalls cause disruption in the supply chain mak-ing the pharmaceutical companies vulnerable to various types of risks. These risks include the potential for losing customers and investors as well as the huge financial losses from fines, penalties, lawsuits, revenue loss, market share and increased operations costs. Purpose: The purpose of this research is to study the consequences of product recall on Pharmaceutical Company. Methodology: Event study methodology was used …

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Structural And Electrical Characterization Of Single Crystalline Srzrxti₁-Xo₃ Thin Films On Germanium, Reza Matthew Moghadam May 2017

Structural And Electrical Characterization Of Single Crystalline Srzrxti₁-Xo₃ Thin Films On Germanium, Reza Matthew Moghadam

Electrical Engineering Dissertations - Archive

The epitaxial growth of crystalline oxides on semiconductors provides a pathway to introduce new functionalities to semiconductor devices. Key to coupling crystalline oxides to semiconductors electrically, to realize functional behavior, is controlling the manner in which their bands align at the interfaces. This document reports on the three research projects on Crystalline Oxide/Semiconductor heterostructures. In the first project we applied principles of band-gap engineering traditionally used at heterojunctions between conventional semiconductors to control the band offset between a single crystalline oxide and a semiconductor. Reactive molecular beam epitaxy is used to realize atomically abrupt and structurally coherent interfaces between SrZrxTi1-xO3 …

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Channel Coding Techniques For 5g Using Polar Codes, Supreet Huilgol May 2017

Channel Coding Techniques For 5g Using Polar Codes, Supreet Huilgol

Electrical Engineering Theses - Archive

Coding and modulation in the crown known as the communications technology, embodies a national basic theory of the overall strength of communication science. Channel coding is a way of encoding data in a communication channel that adds patterns of redundancy into the transmission path in order to lower the error rate. Such methods are widely used in wireless communications. 5G is the coming fifth-generation wireless broadband technology based on the IEEE 802.11ac standard. 5G will provide better speeds and coverage than the current 4G. It operates with a 5 Ghz signal and is set to offer speeds of up to …

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Homogeneous Transcoding Of Hevc (H.265), Ninad Gorey May 2017

Homogeneous Transcoding Of Hevc (H.265), Ninad Gorey

Electrical Engineering Theses - Archive

Video transcoding is an essential tool to promote inter-operability between different video communication systems. This thesis presents a cascaded architecture for homogeneous transcoding of High Efficiency Video Coding. Cascaded Transcoding model decodes the input video sequence and follows the procedure of reference encoder, with the difference being a higher QP value. The encoder will code the sequence with the goal of achieving highest coding performance, and since the encoder is not restricted by any means, it is reasonable to assume that the coding performance is the best possible transcoding performance. H.265 is the latest video coding standard which supports encoding …

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Dermal Uptake Of Phthalates From Clothing: Comparison Of Model To Human Participant Results, Glenn Morrison, C. J. Weschler, G. Bekö May 2017

Dermal Uptake Of Phthalates From Clothing: Comparison Of Model To Human Participant Results, Glenn Morrison, C. J. Weschler, G. Bekö

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In this research, we extend a model of transdermal uptake of phthalates to include a layer of clothing. When compared with experimental results, this model better estimates dermal uptake of diethyl phthalate and di-n-butyl phthalate (DnBP) than a previous model. The model predictions are consistent with the observation that previously exposed clothing can increase dermal uptake over that observed in bare-skin participants for the same exposure air concentrations. The model predicts that dermal uptake from clothing of DnBP is a substantial fraction of total uptake from all sources of exposure. For compounds that have high dermal permeability coefficients, dermal uptake …

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Determination Of Fatty Acid Methyl Esters Derived From Algae Scenedesmus Dimorphus Biomass By Gc-Ms With One-Step Esterification Of Free Fatty Acids And Transesterification Of Glycerolipids, Satya Girish Chandra Avula, Joanne M. Belovich, Yan Xu May 2017

Determination Of Fatty Acid Methyl Esters Derived From Algae Scenedesmus Dimorphus Biomass By Gc-Ms With One-Step Esterification Of Free Fatty Acids And Transesterification Of Glycerolipids, Satya Girish Chandra Avula, Joanne M. Belovich, Yan Xu

Chemical & Biomedical Engineering Faculty Publications

Algae can synthesize, accumulate and store large amounts of lipids in its cells, which holds immense potential as a renewable source of biodiesel. In this work, we have developed and validated a GC–MS method for quantitation of fatty acids and glycerolipids in forms of fatty acid methyl esters derived from algae biomass. Algae Scenedesmus dimorphus drymass was pulverized by mortar and pestle, then extracted by the modified Folch method and fractionated into free fatty acids and glycerolipids on aminopropyl solid-phase extraction cartridges. Fatty acid methyl esters were produced by an optimized one-step esterification of fatty acids and transesterification of glycerolipids …

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Developing Sustainable Rice Production Through Image Classification, Parker R. Fitzgerald May 2017

Developing Sustainable Rice Production Through Image Classification, Parker R. Fitzgerald

Industrial Engineering Undergraduate Honors Theses

The agricultural industry’s continued success is critical to our future. However, many agricultural practices—specifically rice farming—are currently based on unsustainable methods. The processes used in rice farming consume water at an unsupportable rate, and, consequently, are serious contributors to rising emission levels. Several alternative growing methods have been introduced, and one of the most promising candidates is Alternative Wetting and Drying (AWD). An obstacle encountered by proponents of these methods comes in implementation. Studies have shown AWD is more successful in fields with higher leveling precision. The research in this study works to create a stepping stone for farmers to …

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A Quantitative Model For Truck Parking Utilization With Hours Of Service Regulations, Alexis Christine Gaddy May 2017

A Quantitative Model For Truck Parking Utilization With Hours Of Service Regulations, Alexis Christine Gaddy

Industrial Engineering Undergraduate Honors Theses

Continual growth in traffic volume on U.S. Highways and insufficient parking for commercial trucking vehicles has led to significant safety concerns for truck drivers. Hours of Service (HOS) regulations dictate driving and rest periods of truck drivers. When a truck driver must stop as designated by the HOS regulations and the nearest parking location is at capacity, the trucker must either continue driving past the HOS limit or park in an undesignated and possibly illegal or unsafe spot such as an off-ramp. The combination of these two variables play an important role in the safety of truck drivers on a …

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Development Of A New Joint System For A Circular-Shaped Infrastructure, Sugyu Lee May 2017

Development Of A New Joint System For A Circular-Shaped Infrastructure, Sugyu Lee

Civil Engineering Dissertations - Archive

This dissertation focused on development of new carbon fiber joint systems for all types of underground gravity and sewer pipe systems. Specifically, the external CFRP wrap and, particularly, the carbon fiber reinforced polymer (CFRP) internal coupler can be used for concrete pipes with regular or reduced wall thicknesses. The concrete pipes with reduced wall thickness are classified as semi-rigid pipe and are referred to as thin-wall (TW) concrete pipe. The performance of the CFRP coupler is presented in this report based on full-scale experimental tests and three dimensional non-linear finite element studies for regular and thin wall pipes. Finally, design …

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Long-Term Shear Investigation Of Polypropylene Fiber-Reinforced Concrete Beams, Michael Daniels May 2017

Long-Term Shear Investigation Of Polypropylene Fiber-Reinforced Concrete Beams, Michael Daniels

Civil Engineering Dissertations - Archive

This study investigates the long-term influence of polypropylene fibers on the shear strength and failure behavior of longitudinally reinforced concrete beams, with or without stirrups, subjected to accelerated aging conditions. For this study, 32 large scale short beams with different volume fractions of polypropylene fibers were casted and tested in the Civil Engineering Laboratory Building (CELB) at the University of Texas at Arlington: (1) Control reinforced concrete beams (RC); (2) Reinforced concrete beams with minimum stirrups (RCS) according to ACI 318; (3) Synthetic fiber-reinforced concrete beams with Vf=0.5% (SNFRC 0.5%), which correspond to 7.67 lbs./yd3 (4.55 kg/m3)’; and (4) Synthetic …

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Target-Specific Capture Of Relevant Gaseous Compounds Using Natural And Synthetic Nano And Micro Materials, Fernanda Delbuque Guerra May 2017

Target-Specific Capture Of Relevant Gaseous Compounds Using Natural And Synthetic Nano And Micro Materials, Fernanda Delbuque Guerra

All Dissertations

By definition, volatile organic compounds (VOCs) are organic compounds that easily become vapor or gases. Many VOCs are hazardous air pollutants and often known for their low, often unpleasant, threshold odor, which can be below parts per billion in some cases. Nanotechnology-based materials for the remediation of gaseous pollutants has been the focus of many researchers due to their unique chemical and physical properties and enhanced reactivity when compared to bulkier materials. Among the many challenges preventing the global use of nanomaterials are the high costs of fabrication, on-site recovery, limited scale-up, potential toxicity since many of them rely on …

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