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Articles 86521 - 86550 of 197010

Full-Text Articles in Engineering

Structural Competency And Environmental Soundness Of The Recycled Base Materials In North Texas, Mohammad Faysal May 2017

Structural Competency And Environmental Soundness Of The Recycled Base Materials In North Texas, Mohammad Faysal

Civil Engineering Dissertations - Archive

Aggregates, which are derived from natural resources, are the most important raw materials used in pavement construction; however, depletion of the natural resources, increasing labor costs, and environmental concerns have led us to look for alternatives. Recycled materials, such as recycled crushed concrete aggregate (RCCA) and reclaimed asphalt pavement (RAP), can be used as an alternative to natural aggregates and can be obtained from construction of newer structures and demolition of existing structures, such as buildings, bridges, pavement, etc. Recycled materials can reduce the cost, depletion of natural resources, and construction debris. The properties of recycled materials are source-dependent, which …

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Simulation And Design Of Microbolometers For 5-14 Μm Wavelength At Oblique Incidence, Arkadeep Mitra May 2017

Simulation And Design Of Microbolometers For 5-14 Μm Wavelength At Oblique Incidence, Arkadeep Mitra

Electrical Engineering Theses - Archive

A mathematical model was developed to calculate the total power absorbed and total power reflected for a microbolometer for oblique incidence of light viz. s and p polarization by varying the angle of incidence from 1 to 89 degrees. The mathematical model was simulated using matlab in five different sensor structures. A comparative study based on simulation involving the different sensor structures was done. The maximum partial absorbed power for s polarization was 0.9559-0.0000i, 0.9112-0.0000i, 0.9617-0.0000i, 0.3057-0.0000i, 0.9627-0.000i for sensor structure I, 1, 2, 3, 4 at angle of incidence of 73 degree, 1 degree, 66-67 degree, 1-3 degree, 60 …

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A Study Of Consensus And Collision Avoidance In A Platoon Of Vehicles Using Adaptive Cruise Control, Audrey Devin Porter May 2017

A Study Of Consensus And Collision Avoidance In A Platoon Of Vehicles Using Adaptive Cruise Control, Audrey Devin Porter

Electrical Engineering Theses - Archive

Vehicle platooning has been the subject of much research. Transfer function analysis of intervehicle distance errors is traditionally utilized to analyze the string stability of platoons. Consensus theory has been the subject of recent study of close-loop stability of platoons. This thesis extends the cooperative control approach to platoon behavior analysis to include the leader as an internal source of information for the communication graph of a platoon. A 1-Leader Type (1LT) graph is defined and an equation is proposed for the formation consensus values of leader and follower nodes in a platoon. Simulations are performed to support the proposed …

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T-Cell Membrane Camouflaged Nanoparticles For Treatment Of Melanoma, Gizem Oter May 2017

T-Cell Membrane Camouflaged Nanoparticles For Treatment Of Melanoma, Gizem Oter

Bioengineering Theses - Archive

Melanoma is one of the most aggressive skin cancers. The American Cancer Society reports that every hour, one person dies from melanoma. While there are a number of treatments currently available for melanoma (e.g. surgery, chemotherapy, immunotherapy, radiation therapy), these therapies face several problems, including inadequate response rates, high toxicity, and severe side effects due to non-specific delivery of anti-cancer drugs. To improve therapeutic efficiency and reduce these limitations, a multifunctional nanoparticle has been developed. Specifically, poly (lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) were coated with a cellular membrane derived from the T cell hybridoma, 19LF6 endowed with a melanoma-specific anti-gp100/ …

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Development Of An Advanced Geometry Toolkit Framework For Fitting Complex Topology-Optimized Mesh Structures, Harshit Girishkumar Jani May 2017

Development Of An Advanced Geometry Toolkit Framework For Fitting Complex Topology-Optimized Mesh Structures, Harshit Girishkumar Jani

Mechanical and Aerospace Engineering Theses - Archive

Additive Manufacturing is playing a significant role in developing complex geometries which are not possible by conventional Manufacturing Processes. Topology optimization is playing key a role in deciding conceptual design for additive manufacturing. The output of topology optimization is rough and noisy surfaces. Fitting these surfaces poses challenging task to a designer as it is a tedious and a time-consuming process. The main aim of this research is to automate the process of smoothing noisy meshes. In this research work, I have developed algorithms in MATLAB to create NURBS (Non-Uniform B-Spline) surface patches from given a set of control points. …

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A Parametric Study On Thermal Mixing Of Ambient Air And Return Air Streams In A Mixing Chamber Of A Data Center Cooling, Pavan Vijaykumar Kaulgud May 2017

A Parametric Study On Thermal Mixing Of Ambient Air And Return Air Streams In A Mixing Chamber Of A Data Center Cooling, Pavan Vijaykumar Kaulgud

Mechanical and Aerospace Engineering Theses - Archive

Thermal Mixing of ambient air and return air streams in a mixing chamber for data center cooling Keywords: Data center cooling, Air side economization, Mixing chamber geometry Pavan Kaulgud, Dr. Dereje Agonafer Air side economization is an arrangement of duct, damper and automatic control system which together allow to introduce outside air to reduce or eliminate the mechanical cooling during mild or cold weather. In this process ambient air is drawn inside from environment, passed through filter to get rid of contaminants and then is introduced to the cold aisle of data center. According to ASHRAE, use of air side …

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Finite Element Analysis Of Composite Aircraft Fuselage Frame, Aditya Milind Dandekar May 2017

Finite Element Analysis Of Composite Aircraft Fuselage Frame, Aditya Milind Dandekar

Mechanical and Aerospace Engineering Theses - Archive

Composites have been introduced in aircraft industries, for their stronger, stiffer, and lighter properties than their metal-alloys counterparts. The general purpose of an aircraft is to transport commercial or military payload. Aircraft frames primarily maintains the shape of fuselage and prevent instability of the structure. Fuselage is similar as wing in construction which consist of longitudinal elements (longerons and stringers), transverse elements (frames and bulkheads) and its external skin. The fuselage is subjected to forces such as the wing reactions, landing gear reaction, empennage reaction, inertia forces subjected due to size and weight, internal pressure forces due to high altitude. …

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Steady State And Transient Analytical Modelling Of Non-Uniform Convective Cooling Of A Microprocessor Chip Due To Jet Impingement, Swapnil D. Luhar May 2017

Steady State And Transient Analytical Modelling Of Non-Uniform Convective Cooling Of A Microprocessor Chip Due To Jet Impingement, Swapnil D. Luhar

Mechanical and Aerospace Engineering Theses - Archive

Heat removal from microprocessor chips with multiple regions of dynamic heat generation remains a critical technological challenge. Excessive temperature rise is undesirable for performance as well as reliability. Jet impingement cooling has been widely investigated as a potential thermal management technique due to the capability of localized cooling and of dynamically following the heat generation distribution. A jet offers large local convective heat transfer coefficient, for which theoretical models and correlations have been proposed for a variety of scenarios. However, not much work exists on using this information to determine the resulting temperature distribution. This work addresses this need by …

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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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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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