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Articles 4321 - 4350 of 11510
Full-Text Articles in Engineering
Investigation Of A Pressure Wave Supercharger For An Industrial Diesel Engine, Brian A. Beasley
Investigation Of A Pressure Wave Supercharger For An Industrial Diesel Engine, Brian A. Beasley
Theses and Dissertations
Internal combustion engines suffer from decreased performance as altitude is in- creased. This performance decrease can be overcome by increasing the pressure in the engine's intake manifold. Typically, this is accomplished with a turbocharger or supercharger. However, mechanical compression devices such as these suffer from decrease compression efficiency as the size of the device decreases. The size of the compression device scales with the amount of mass ow through the device, and the amount of mass ow is proportional to the size of the engine. This means a small turbocharger for a small engine is less efficient than a larger …
Arrhenius Rate Chemistry Informed Inter-Phase Source Terms (Arciist) For Macro-Scale Explosive Hydrocodes, Matthew J. Schwaab
Arrhenius Rate Chemistry Informed Inter-Phase Source Terms (Arciist) For Macro-Scale Explosive Hydrocodes, Matthew J. Schwaab
Theses and Dissertations
A critical factor in hydrocodes designed to simulate explosive material is defining the chemical reaction rate under various conditions. This rate determines how quickly the granular solid explosive is converted to its gaseous products. Currently, the state of the art for macro-scale hydrocodes is to use one of numerous burn models. These burn models are designed to estimate the bulk chemical reaction rate. Unfortunately, these burn rate models are largely based on empirical data and must be recalibrated for every new material being simulated. This research proposes that the use of Arrhenius Rate Chemistry Informed Interphase Source Terms (ARCIIST) in …
Self-Assembly Of Protein Fibrils In Microgravity, Dylan Bell
Self-Assembly Of Protein Fibrils In Microgravity, Dylan Bell
Theses and Dissertations
Deposits of insoluble protein fibrils in human tissue are associated with amyloidosis and neurodegenerative diseases. Different proteins are involved in each disease; all are soluble in their native conformation in vivo, but by molecular self-assembly, they all form insoluble protein fibril deposits with a similar cross -sheet structure. The study of molecular self-assembly is also of interest to origin of life. The development of cellular activity was dependent upon the creation of large complex molecular structures in the chemical and environmental conditions present when life originated. Although life probably arose in a planetary environment, microgravity is known to effect cellular …
Multidisciplinary Design Optimization Of Life Cycle Benefit Of Trimarans Using Monte Carlo Method, Lin Du
Multidisciplinary Design Optimization Of Life Cycle Benefit Of Trimarans Using Monte Carlo Method, Lin Du
Theses and Dissertations
This thesis presents a methodology for multidisciplinary design and optimization (MDO) of the life cycle benefit (LCB) of trimarans. Unlike naval vessels which have a robust fire power and other capabilities which are very difficult to be quantified, the essence of a commercial ship’s construction and operation is an investment. The ship owners must consider the benefits accruing from lifelong development/deployment of a commercial vessel, taking in to account the construction time, interest rate, cost of operation, maintenance, drydocking, annual revenue, etc. Whether or not a ship design has outstanding economic potential, depends on only one standard value in the …
Three-Dimensional Wall Effects In A Scramjet Cavity Flameholder, Evan P. Oren
Three-Dimensional Wall Effects In A Scramjet Cavity Flameholder, Evan P. Oren
Theses and Dissertations
Scramjets, or supersonic combustion ramjets, are a key component for the development of powered hypersonic vehicles. The flameholding strategy used in this engine creates a recirculation region by creating a cavity in one side of the combustor. This highly unsteady region is difficult to interrogate through conventional means. A novel optical observation technique called hyperspectral imaging has been developed to examine the scramjet combustion chamber. The hyperspectral camera is capable of generating an interferogram at hundreds to thousands of wavelengths. These data are integrated across the line-of-sight with no information on three-dimensional (3D) location of origin. A model must be …
Thermochemical Non-Equilibrium Models For Weakly Ionized Hypersonic Flows With Application To Slender-Body Wakes, Matthew P. Clarey
Thermochemical Non-Equilibrium Models For Weakly Ionized Hypersonic Flows With Application To Slender-Body Wakes, Matthew P. Clarey
Theses and Dissertations
The current resurgence of interest in hypersonic technologies has warranted an inquiry into the commonly employed thermochemical non-equilibrium models within computational fluid dynamic (CFD) simulations. Additionally, research has historically focused on forebody flowfields, while studies of the complex wake structure have remained elusive. Although the forebody is of significance for vehicle analysis, the wake presents many exploitative characteristics. This dissertation aimed to address these two deficits. First, two three-temperature non-equilibrium models were developed, increasing the fidelity of hypersonic solutions above that of the legacy two-temperature model. The models were then investigated via zero-dimensional simulations, to detail the non-equilibrium processes, and …
Thermal Transport At Superhydrophobic Surfaces In Impinging Liquid Jets, Natural Convection, And Pool Boiling, Matthew Clark Searle
Thermal Transport At Superhydrophobic Surfaces In Impinging Liquid Jets, Natural Convection, And Pool Boiling, Matthew Clark Searle
Theses and Dissertations
This dissertation focuses on the effects of superhydrophobic (SHPo) surfaces on thermal transport. The work is divided into two main categories: thermal transport without phase change and thermal transport with phase change. Thermal transport without phase change is the topic of four stand-alone chapters. Three address jet impingement at SHPo surfaces and the fourth considers natural convection at a vertical, SHPo wall. Thermal transport with phase change is the topic of a single stand-alone chapter exploring pool boiling at SHPo surfaces. Two chapters examining jet impingement present analytical models for thermal transport; one considered an isothermal wall and the other …
Vanishing Connections: Application Resiliency Through Cross-Network Tcp Migration, David Elliott
Vanishing Connections: Application Resiliency Through Cross-Network Tcp Migration, David Elliott
Theses and Dissertations
Computer applications are subject to a plethora of security challenges, ranging from concerns over network monitoring to avoiding expensive and damaging intrusion and compromise. A vast number of techniques exist to mitigate applications’ vulnerability to these threats: network policies can be adjusted, traffic can be rerouted, firewalls can be installed, hosts can be hardened, applications can be patched. A large body of research exists to improve the security of hosts in this context. However, for applications that have already been the subject of damaging attacks, we no longer focus primarily on security, but shift to resiliency, or the capacity of …
Two Channel Sdm Communication System Simultaneously Operating At 10gb/S Using C-Band Transceivers, Han Wang
Two Channel Sdm Communication System Simultaneously Operating At 10gb/S Using C-Band Transceivers, Han Wang
Theses and Dissertations
Increasing the bandwidth of optical fiber communications to cope with high-speed network traffic is an important goal for the communications industry. Therefore, optical communication is growing at a very rapid pace, including the multiplexing technology. Spatial domain multiplexing (SDM), also known as Space division multiplexing, is a Multi-Input Multi-Output (MIMO) architecture that can increase the data carrying capacity of optical fibers by multiple folds. SDM allows multiple channels of same wavelength to be transmitted in parallel over standard multi-mode fibers, where each SDM channel follows a different helical trajectory while traversing the length of the fiber that lead to unique …
Efficacy Of Eluted Antibiotics In 3d Printed Orthopaedic Implants, Mohammed Mehdi Benmassaoud
Efficacy Of Eluted Antibiotics In 3d Printed Orthopaedic Implants, Mohammed Mehdi Benmassaoud
Theses and Dissertations
Costs associated with musculoskeletal diseases in the United States account for 5.7 % of the Gross Domestic Product (GDP) [1]. As such, there is a need to pursue new ideas in orthopaedic implants that can decrease cost and improve patient care. In the recent years, 3D printing using Fused Deposition Modeling (FDM) or Stereolithography (SLA) has opened several exciting possibilities to create orthopaedic implants. Such implants can be engineered to release antibiotics in a controlled manner either by infusing the drug into the material during manufacturing or by using built-in design features such as micro-channels and reservoirs [2]. The use …
Development Of A Subsurface Landfill Fire Risk-Index, Samain Sabrin
Development Of A Subsurface Landfill Fire Risk-Index, Samain Sabrin
Theses and Dissertations
Landfill subsurface fires create environmental hazards by emitting potentially dangerous particulates into the atmosphere and damaging liners, potentially contaminating surrounding soil and groundwater aquifers with leachate. Currently, the only means of detecting underground fires are physical tests. This paper is used to describe an index that can be employed to track fire risk across a landfill. The landfill parameters analyzed for fire risk susceptibility in Chapter 1 include residual nitrogen concentration, oxygen exceedance, methane concentration, carbon monoxide level, methane and carbon dioxide ratio and monitoring well temperature. Incorporating these factors, a landfill fire index ranging from 1 to 10 was …
Vertical Electrical Impedance Measurements On Concrete Bridge Decks Using A Large-Area Electrode, Jeffrey David Barton
Vertical Electrical Impedance Measurements On Concrete Bridge Decks Using A Large-Area Electrode, Jeffrey David Barton
Theses and Dissertations
In regions where chloride-based deicing salts are applied to bridge decks, corrosion of the interior steel reinforcement is a major problem. Vertical electrical impedance (VEI) is an effective measurement technique to quantitatively assess the cover protection on bridges against aggressive chemical penetration of reinforced concrete. In its current form, traditional vertical electrical impedance is time-consuming and destructive because a direct connection to the reinforcing steel is required to provide a ground reference. A new method using a large-area electrode (LAE) permits VEI measurement without a direct electrical connection to the steel reinforcement. The LAE creates a nondestructive, semi-direct, low impedance …
Elementet Lidhëse Tek Konstruksionet E Drurit – Shqyrtimi I Literaturës Ekzistuese Dhe Rast Studimi Analitik, Visar Nurshaba
Elementet Lidhëse Tek Konstruksionet E Drurit – Shqyrtimi I Literaturës Ekzistuese Dhe Rast Studimi Analitik, Visar Nurshaba
Theses and Dissertations
Punimi i realizuar bazohet në lëndën: Konstruksionet e Drurit. Në këtë punim bëhet fjalë për konstruksionet e kulmeve në përgjithësi dhe elementet lidhëse të konstruksionit në veçanti. Materiali ka për qëllim prezantimin e elementeve lidhëse dhe mënyrat e ndryshme të përdorimit të tyre në strukturën e kulmit. Ndarja është bërë në kapituj ku pasqyrohet kronologjia e përdorimit të drurit nga koha kur zuri hapat e parë të përdorimit e deri tek përdorimi bashkëkohor me mjetet e avancuara të përpunimit. Elementet lidhëse ofrojnë një komoditet më të madh në aspektin e montimit të elementeve të drurit dhe jetëgjatësi më të madhe …
Organizimi I Objektit “Depo Per Materiale Elektrike”, Krenare Elezi
Organizimi I Objektit “Depo Per Materiale Elektrike”, Krenare Elezi
Theses and Dissertations
Qëllimi për këtë punim bazohet në hulumtimin e organizimit të punishtes, zgjidhjen e parakohshme të problemeve që mund të ndodhin gjatë ndërtimit, rritjen e cilësisë si dhe efektivitetin e proceseve të menaxhimit. Objekti që është marrë shembull në këtë punim është dedikuar për depo e materialit elektrik dhe vendodhja e tij është në zonën industriale Gjakovë. Problemi kryesor që shfaqet gjatë realizimit të një objekti ndërtimor shpesh vihet si shkak i një planifikimi jo korrekt, që mund të vjen deri në humbjet e shumta në aspektin kohor dhe financiar. Prandaj ky punim ka si motiv kryesor organizmin, si fazë kryesore …
Dynamic Cone Penetration Tests For Liquefaction Evaluation Of Gravelly Soils, Michael H. Talbot
Dynamic Cone Penetration Tests For Liquefaction Evaluation Of Gravelly Soils, Michael H. Talbot
Theses and Dissertations
Dynamic Cone Penetration Tests for LiquefactionEvaluation of Gravelly SoilsMichael H. TalbotDepartment of Civil and Environmental Engineering, BYUDoctor of PhilosophyIn North American practice, the Becker Penetration Test (BPT) has become the primary field test used to measure penetration resistance of gravelly soils. However, this test is expensive and uncertainties exist regarding correlations and corrections for rod friction. As an alternative, the dynamic penetration test (DPT) developed in China has recently been correlated with liquefaction resistance in gravelly soils. The DPT equipment consists of a 74 mm diameter cone tip driven by a 120 kg hammer with a free fall height of …
Methods And Metrics To Measure And Predict The Social Impact Of Engineered Products, Phillip Douglas Stevenson
Methods And Metrics To Measure And Predict The Social Impact Of Engineered Products, Phillip Douglas Stevenson
Theses and Dissertations
More than ever before, engineers are creating products for developing countries. One of the purposes of these products is to improve the consumer's quality of life. Currently, there is no established method of measuring the social impact of these types of products. As a result, engineers have used their own metrics to assess their product's impact, if at all. Some of the common metrics used include products sold and revenue, which measure the financial success of a product without recognizing the social successes or failures it might have. In this thesis I introduce a potential metric, the Product Impact Metric …
Efficient Incorporation Of Fatigue Damage Constraints In Wind Turbine Blade Optimization, Bryce Taylor Ingersoll
Efficient Incorporation Of Fatigue Damage Constraints In Wind Turbine Blade Optimization, Bryce Taylor Ingersoll
Theses and Dissertations
Improving the wind turbine blade design has a significant effect on the efficiency of the wind turbine. This is a challenging multi-disciplinary optimization problem. During the blade design process, the aerodynamic shapes, sizing of the structural members, and material composition must all be determined and optimized. Some previous blade design methods incorporate the wind turbine's static response with an added safety factor to account for neglected dynamic effects. Others incorporate the dynamic response, but in general is limited to a few design cases. By not fully incorporating the dynamic response of the wind turbine, the final turbine blade design is …
Analysis Of Flash In Injection Molding Using Flow Simulation And Design Of Experiments, Claudia Lizette Lopez
Analysis Of Flash In Injection Molding Using Flow Simulation And Design Of Experiments, Claudia Lizette Lopez
Theses and Dissertations
This study presents a method of detecting flash by using flow simulation along with the mold processing conditions and the DOE analysis values from all input and output parameters that will be calculated. All of this would be completed in order to compare and verify the DOE and simulation results and find out if it can be applied to an actual live production molded part, in this case, the Leap char ribbon. This paper will also describe the scrap issue that is presently happening on this molded part, and what are the options that there is in order to find …
Permeability Characterization And Fluorescent Void Flow Monitoring For Processing Simulation, John Caleb Lystrup
Permeability Characterization And Fluorescent Void Flow Monitoring For Processing Simulation, John Caleb Lystrup
Theses and Dissertations
Liquid composite molding (LCM) is growing in importance alternative to traditional prepreg-autoclave methods for manufacture aerospace composites. The most significant roadblock to industry's implementation of LCM is the optimization of resin flow to ensure high quality parts. This study developed process optimization tools to foster the adaptation of LCM. The following dissertation characterized the permeability of reinforcement fabrics under various processing conditions, and investigated in-situ bubble flow with carbon fiber. The purpose of this research is to extend the understanding of LCM and push forward the state of the art via sub-studies captured in five chapters, or manuscripts. Research from …
Design, Modeling, And Thermal Characterization Of Temperature Gradient Gas Chromatography Micro-Columns, Parker David Schnepf
Design, Modeling, And Thermal Characterization Of Temperature Gradient Gas Chromatography Micro-Columns, Parker David Schnepf
Theses and Dissertations
This thesis presents a thermal gradient gas chromatography (TGGC) system that is implemented on a micro-scale. The GC column is approximately 20 cm long and is fabricated out of silicon with 21 nickel thin-film heaters evenly placed along the length of the column. Computational heat transfer models using ANSYS Mechanical APDL predict heating and cooling rates up to 32,000 deg C/min and 3,600 deg C/min, respectively. These results are verified through testing an experimental silicon channel. A PI controller which uses resistance measurements to calculate thin-film temperature is used for obtaining dynamic thermal gradient control. This controller is shown to …
Automated Impact Response Sounding For Accelerated Concrete Bridge Deck Inspection, Jacob Lynn Larsen
Automated Impact Response Sounding For Accelerated Concrete Bridge Deck Inspection, Jacob Lynn Larsen
Theses and Dissertations
Infrastructure deterioration is an international problem requiring significant attention. One particular manifestation of this deterioration is the occurrence of sub-surface cracking (delaminations) in reinforced concrete bridge decks. Of many techniques available for inspection, air-coupled impact-echo testing, or sounding, is a non-destructive evaluation technique to determine the presence and location of delaminations based upon the acoustic response of a bridge deck when struck by an impactor. In this work, two automated air-coupled impact echo sounding devices were designed and constructed. Each device included fast and repeatable impactors, moving platforms for traveling across a bridge deck, microphones for air-coupled sensing, distance measurement …
Methods For Creating Rigid Foldability In Origami-Inspired Deployable Mechanisms, Alden Daniel Yellowhorse
Methods For Creating Rigid Foldability In Origami-Inspired Deployable Mechanisms, Alden Daniel Yellowhorse
Theses and Dissertations
Because origami has proved to be a tremendously rich source of inspiration in engineering, interest in solving some of the challenges that affect origami-inspired design has been significant. One such challenge involves ensuring that origami-inspired mechanisms are rigid-foldable or capable of moving without requiring links to bend or distort. Because rigid-foldability is essential in mechanisms that are constructed using rigid materials, access to methods of engineering this characteristic are highly desirable. This research addresses this need by developing methods for the design of origami-inspired mechanisms that are rigid-foldable. Methods for modifying crease patterns to achieve this are described and compared. …
The Use Of Recommender Systems In Web Applications – The Troi Case, Donjeta Mulaj
The Use Of Recommender Systems In Web Applications – The Troi Case, Donjeta Mulaj
Theses and Dissertations
Avoiding digital marketing, surveys, reviews and online users behavior approaches on digital age are the key elements for a powerful businesses to fail, there are some systems that should preceded some artificial intelligence techniques. In this direction, the use of data mining for recommending relevant items as a new state of the art technique is increasing user satisfaction as well as the business revenues. And other related information gathering approaches in order to our systems thing and acts like humans. To do so there is a Recommender System that will be elaborated in this thesis. How people interact, how to …
Performanca E Makinave Kerkuese Duke Perdorur Cloud Shërbimet “Elasticsearch” Dhe “Algolia”, Besnik Korça
Performanca E Makinave Kerkuese Duke Perdorur Cloud Shërbimet “Elasticsearch” Dhe “Algolia”, Besnik Korça
Theses and Dissertations
Ueb Aplikacionet me data-set të mëdha në kohën e tanishme janë shumë më të përhapura. Kërkimet e të dhënave në data-set të tilla për shkak të performances bëhen duke përdorur makinat kërkuese. Provider të ndryshëm ofrojnë makina kërkuese si Software as a Service(SaaS) shërbime të cilat kanë për avantazh konfigurimin minimal që duhet bërë makinave kërkuese për t’i vënë në funksion. Nëpërmjet këtij punimi synohet që së pari të analizohen shërbimet cloud computing që ofrohen nga provider të ndryshem. Pastaj pasi që fokusi i makinave kërkuese ndodhet në “information retrieval” është bë analizimi i disa teknikave të “information retrieval”. Makinat …
Modelimi Dhe Kontrolli I Sistemit Të Mikrorrjetit Me Fotovoltaik/Turbina Me Erë, Kadri Krasniqi
Modelimi Dhe Kontrolli I Sistemit Të Mikrorrjetit Me Fotovoltaik/Turbina Me Erë, Kadri Krasniqi
Theses and Dissertations
Mikrorrjetet çdo ditë e më tepër janë duke u bërë faktorë më të rendësishëm për të ardhmen e sistemeve të energjisë. Në këtë temë janë marrë në konsideratë dy burime të Energjisë: Energjinë diellore dhe atë të erës. Këto dy burime të ripërtritshme të Energjisë janë të lidhura paralel në sistemin e mikrorrjetit, në menyrë që të marrim performancë më të mirë nga mikrorrjeti. Mikrorrjeti është koncept që integron një sasi të madhe të burimeve të vogla duke mos ndërprerë operimin e rrjetit kryesorë. Ky rrjet hibrid përbëhet nga panelet fotovoltaike dhe turbina të erës për rrjetet DC respektivisht për …
Struktura Nga Druri Monolit (Objekt Me Destinim Ekonomik, Zona Industriale Gjakovë), Çlirim Qarri
Struktura Nga Druri Monolit (Objekt Me Destinim Ekonomik, Zona Industriale Gjakovë), Çlirim Qarri
Theses and Dissertations
Motivi për këtë hulumtim bazohet në cilësitë pozitive të drurit monolit si material ndërtimor. Objekti i trajtuar në këtë punim është projektuar si objekt me destinim ekonomik dhe lokacioni i tij është menduar në zonën industriale, Gjakovë. Problematikë kryesore e realizimit të objekteve ekonomike është krijimi i hapësirave të mëdha mes mbajtësve, në mënyrë që të mos pengohet procesi teknologjik. Përcaktimi i distancës mes mbajtësve shpesh kufizohet nga pesha vetjake e materialit të mbajtësve, prandaj për këtë punim është përzgjedhur druri monolit si material me peshë vetjake katër herë më të vogël se betoni. Pesha e vogël vetjake e materialit …
Punimet Tokësore Për Ndërtimin E Infrastrukturës Rrugore, Gëzim Fetahu
Punimet Tokësore Për Ndërtimin E Infrastrukturës Rrugore, Gëzim Fetahu
Theses and Dissertations
Historia e lindje së rrugëve është e vjetër po aq sa është edhe shfaqja e njeriut në Tokë. Rruga lindi si kërkesë e njeriut për të siguruar mirëqenien e tij etj. Mbulimi me rrjetin e infrastrukturës rrugore për një vendi, territori, rajoni, zone etj., ka një rëndësi të veçantë dhe është e domosdoshme për një standard jetësor sa më cilësor. Si në të kaluarën, edhe sot rrejti rrugor, respektivisht infrastruktura rrugore ka luajtur dhe luan rolin dominant në zhvillimin e përgjithshëm social dhe ekonomik. Ndërtimi i rrugëve ballafaqohet me ndërhyrje të shumta të cilat realizohen përmes punimeve tokësore siç janë: …
Employees Attitudes Toward Safety Risk Management And Safety Performance At U.S. Airports, Umut Oztekin
Employees Attitudes Toward Safety Risk Management And Safety Performance At U.S. Airports, Umut Oztekin
Theses and Dissertations
Increasing air transportation traffic around the world initiated authorities to take new safety measures into consideration. In 2010, the Federal Aviation Administration (FAA) issued a Notice of Proposed Rulemaking to introduce Safety Management Systems (SMS) to the airport community (FAA, 2016). Throughout the years, the FAA has introduced SMS as a 4-pillar system for airports to provide a systematic approach to identify hazards, mitigate risks, increase safety performance, enhance reporting systems, and increase communication systems. It is advised by the FAA that airport employees should confidently speak up and report safety related incidents for further development of airport safety. The …
Field Validation Of An Advanced Autonomous Method Of Exterior Dam Inspection Using Unmanned Aerial Vehicles, Benjamin Joseph Barrett
Field Validation Of An Advanced Autonomous Method Of Exterior Dam Inspection Using Unmanned Aerial Vehicles, Benjamin Joseph Barrett
Theses and Dissertations
The maintenance of infrastructure is critical to the well-being of society. This work focuses on a novel method for inspecting the exterior of dams using unmanned aerial vehicles (UAVs) in an automated fashion. The UAVs are equipped with optical sensors capturing still images. The resulting images are used to generate three-dimensional (3D) models using Structure from Motion (SfM) computer software. The SfM models are then used to inspect the exterior of the dam. As typical dam inspections entail completing a checklist of inspection items with varied degrees of precision (e.g. a concrete spillway may be finely inspected for cracking or …
The Impact Of Nanostructured Templates And Additives On The Performance Of Si Electrodes And Solid Polymer Electrolytes For Advanced Battery Applications, Jui Chin Fan
Theses and Dissertations
The primary objectives of this research are: (1) use a hierarchical structure to study electrode materials for next-generation lithium-ion batteries (LIBs) and (2) understand the fundamentals and utility of solid polymer electrolytes (SPEs) with the addition of halloysite nanotubes (HNTs) for battery applications. Understanding the fundamental principles of electrode and electrolyte materials allows for the development of high-performance LIBs. The contributions of this dissertation are described below. Encapsulated Si-VACNT Electrodes. Two hurdles prevent Si-based electrodes from mass production. First, bulk Si undergoes volume expansion up to 300%. Second, a solid-electrolyte interphase (SEI) forms between the interface of the electrolyte and …