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2015

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Articles 241 - 270 of 7524

Full-Text Articles in Engineering

Design Of A Meta-Material With Targeted Nonlinear Deformation Response, Zachary Satterfield Dec 2015

Design Of A Meta-Material With Targeted Nonlinear Deformation Response, Zachary Satterfield

All Theses

The M1 Abrams tank contains track pads consist of a high density rubber. This rubber fails prematurely due to heat buildup caused by the hysteretic nature of elastomers. It is therefore desired to replace this elastomer by a meta-material that has equivalent nonlinear deformation characteristics without this primary failure mode. A meta-material is an artificial material in the form of a periodic structure that exhibits behavior that differs from its constitutive material. After a thorough literature review, topology optimization was found as the only method used to design meta-materials. Further investigation determined topology optimization as an infeasible method to design …

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An Examination Of Microbial Community Composition At Tba-Degrading Versus Non-Degrading Sites, Courtney Thompson Dec 2015

An Examination Of Microbial Community Composition At Tba-Degrading Versus Non-Degrading Sites, Courtney Thompson

All Theses

Understanding how fuel oxygenates interact with microorganisms in the subsurface is important for the remediation of contaminated sites and designing and optimizing remedial strategies. The current understanding of methyl tertiary butyl ether (MTBE) and tertiary butyl alcohol (TBA) degradation in the environment has been developed primarily through gas chromatography GC analysis and culture-based laboratory studies. Microbial communities can be very diverse, and while microcosm studies provide valuable data, few metagenomic studies have been performed. To elucidate the significant microorganisms and pathways involved in the breakdown of MTBE and TBA, the compositions of entire indigenous microbial populations must be investigated and …

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Degradation Of Organic Pollutants And Microorganisms From Wastewater Using Different Dielectric Barrier Discharge Configurations—A Critical Review, Emile S.Massima Mouele, Jimoh O. Tijani, Ojo O. Fatoba, Leslie F. Petrik Dec 2015

Degradation Of Organic Pollutants And Microorganisms From Wastewater Using Different Dielectric Barrier Discharge Configurations—A Critical Review, Emile S.Massima Mouele, Jimoh O. Tijani, Ojo O. Fatoba, Leslie F. Petrik

Mining Engineering Faculty Research & Creative Works

The growing global drinking water crisis requires the development of novel advanced, sustainable, and cost-effective water treatment technologies to supplement the existing conventional methods. One such technology is advanced oxidation based on dielectric barrier discharge (DBD). DBD such as single and double planar and single and double cylindrical dielectric barrier configurations have been utilized for efficient degradation of recalcitrant organic pollutants. The overall performance of the different DBD system varies and depends on several factors. Therefore, this review was compiled to give an overview of different DBD configurations vis-a-viz their applications and the in-situ mechanism of generation of free reactive …

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Mitigating Pavement Edge Drop Off, Wayne Jensen, Niles Uerling Dec 2015

Mitigating Pavement Edge Drop Off, Wayne Jensen, Niles Uerling

Nebraska Department of Transportation: Research Reports

The objective of this research was to investigate and document practices currently being used by the Nebraska Department of Roads (NDOR) districts and other State DOTs to mitigate pavement edge drop off. The NDOR has developed (or borrowed) and is currently incorporating into its standard practices several procedures that significantly decrease the incidence and magnitude of pavement edge-drop off. As these practices become more fully integrated into highway reconstruction projects, pavement edge drop off is expected to decrease dramatically. Localized areas of pavement edge drop off along paved lanes with bare or vegetated shoulders were noted as posing particular problems …

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Modeling Information Reliability And Maintenance: A Systematic Literature Review, Daysi A. Guerra Garcia Dec 2015

Modeling Information Reliability And Maintenance: A Systematic Literature Review, Daysi A. Guerra Garcia

Industrial Engineering Undergraduate Honors Theses

Operating a business efficiently depends on effective everyday decision-making. In turn, those decisions are influenced by the quality of data used in the decision-making process, and maintaining good data quality becomes more challenging as a business expands. Protecting the quality of the data and the information it generates is a challenge faced by many companies across all industrial sectors. As companies begin to use data from these large data bases they will need to begin to develop strategies for maintaining and assessing the reliability of the information they generate using this data. A considerable amount of literature exists on data …

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Medium-Range Ensemble Precipitation And Streamflow Forecasting For The Upper Trinity River Basin In Texas Via The Nws Hydrologic Ensemble Forecast Service, Hossein Sadeghi Dec 2015

Medium-Range Ensemble Precipitation And Streamflow Forecasting For The Upper Trinity River Basin In Texas Via The Nws Hydrologic Ensemble Forecast Service, Hossein Sadeghi

Civil Engineering Theses - Archive

Compared to forecasts of short-term precipitation accumulations (daily or shorter) at lead times larger than a few days, those of longer-term accumulations (3-daily or longer) are significantly more skillful owing to the larger temporal scale of aggregation. If one can utilize this skill present in medium-range precipitation forecast in hydrologic prediction, it is very likely that the lead time of hydrologic forecasts, in particular, of streamflow and soil moisture may be extended. Though forecasts of longer-term accumulations of precipitation are more skillful than those of shorter-term accumulations, precipitation forecasts in general are too uncertain to be used as deterministic, or …

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Feasibility Of Underground Freight Transportation (Uft) In Texas, Seyedeh Hosna Mousavipour Dec 2015

Feasibility Of Underground Freight Transportation (Uft) In Texas, Seyedeh Hosna Mousavipour

Civil Engineering Theses - Archive

The U.S. economy is expected to double in size over the next 30 years. Truck and rail freight traffic is expected to increase by approximately 45 percent. Air freight is expected to triple in response to demand for the rapid movement of high-value merchandise, while multimodal shipments will likely double. Texas with a gross state product (GSP) of $1.4 trillion dollars is the second largest economy in the U.S. Its size and population, central location, Gulf coastline, and energy resources require a reliable freight transportation system to facilitate further growth. This thesis focuses on the feasibility of Underground Freight Transportation …

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Bayesian Statistics And Information Fusion For Gps-Denied Navigation, Brian Lee Copp Dec 2015

Bayesian Statistics And Information Fusion For Gps-Denied Navigation, Brian Lee Copp

Mechanical and Aerospace Engineering Dissertations - Archive

It is well known that satellite navigation systems are vulnerable to disruption due to jamming, spoofing, or obstruction of the signal. The desire for robust navigation of aircraft in GPS-denied environments has motivated the development of feature-aided navigation systems, in which measurements of \textit{environmental features} are used to complement the dead reckoning solution produced by an inertial navigation system. Examples of environmental features which can be exploited for navigation include star positions, terrain elevation, terrestrial wireless signals, and features extracted from photographic data. Feature-aided navigation represents a particularly challenging estimation problem because the measurements are often strongly nonlinear, and the …

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Development, Testing And Characterization Of Electronic Skins For Robots, Ritvij Sahasrabuddhe Dec 2015

Development, Testing And Characterization Of Electronic Skins For Robots, Ritvij Sahasrabuddhe

Electrical Engineering Theses - Archive

The main purpose of this thesis is to test and characterize newly developed pressure sensors integrated into robot skin and understand their behavior for different testing parameters such as sensor and skin materials and geometry. Flexible electronic skin is meant to behave similar to human skin acting as a tactile interface with the robot environment. Before placing electronic skin onto robots, it is important to test and characterize such structures. Since the behavior of our pressure sensors embedded in robot skin was still unknown, an experimental setup has been developed in order to test and characterize the sensors and collect …

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Evaluation Of Coding Tools For Screen Content In High Efficiency Video Coding, Shwetha Chandrakant Kodpadi Dec 2015

Evaluation Of Coding Tools For Screen Content In High Efficiency Video Coding, Shwetha Chandrakant Kodpadi

Electrical Engineering Theses - Archive

High Efficiency Video Coding (HEVC) [1] is the latest Video Coding format. It challenges the state-of-the-art H.264/AVC [3] Video Coding standard which is in current use in the industry by being able to reduce the bit rate by 50% and retaining the same video quality. It came into existence in the early 2012 although Joint Collaborative Team on Video Coding (JCT-VC) was formed in January 2001 to carry out developments on HEVC, and ever since then a huge range of development has been going on. On 13 April 2013 [11], HEVC standard also called H.265 was approved by ITU-T, Joint …

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An Investigation Of The Relation Between Sleep Disordered Breathing And Cognitive Function, Nazaneen Mousavi Dec 2015

An Investigation Of The Relation Between Sleep Disordered Breathing And Cognitive Function, Nazaneen Mousavi

Bioengineering Theses - Archive

Obstructive sleep apnea (OSA) is one of the most prevalent sleep related breathing disorders, with an estimated amount 17% of affected adults in the U.S. Research has linked OSA to mood and cognitive disorders, including Alzheimer’s disease. Structural changes in the brain have also been found to be associated with OSA. Several studies have shown deterioration of cognition in OSA patients because of structural and physiological changes due to apnea. The purpose of this research is to study the correlational relationships between cognitive measures and 1) quantitative measures of sleep quality; 2) measures of sleep disordered breathing; and 3) hypoxia …

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Implementation Process For Automated Data Analysis In Mineral Extraction Companies, Richard A. Leach Dec 2015

Implementation Process For Automated Data Analysis In Mineral Extraction Companies, Richard A. Leach

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

The need to determine knowledge from increasing amounts of information and raw data is a current and ongoing goal [1]. As technology continues to advance in the ability to collect and save more and more data, companies today must assimilate and understand this information as a valuable resource [2]. Companies in marketing and sales have found the use of a data warehouse and automated data analysis to be valuable resources [2]. This automated analysis of data has also been implemented in disciplines including scientific and medical research [2]. However, there continue to be other lower tech industrial areas of activity …

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Two Phase Flow Cfd Analysis Of Refrigerants In A Condenser Pipe For Prediction Of Pressure Drop And Pumping Power, Aniket Ramchandra Kalambe Dec 2015

Two Phase Flow Cfd Analysis Of Refrigerants In A Condenser Pipe For Prediction Of Pressure Drop And Pumping Power, Aniket Ramchandra Kalambe

Mechanical and Aerospace Engineering Theses - Archive

With the ever growing need of achieving optimum cooling at chip level at the expense of low input pumping power and keeping in check the Global Warming Potential (GWP) & Ozone Depletion Potential (ODP) has given rise to “two-phase on chip cooling” with nature friendly refrigerants. Currently, “air-cooling” and “single-phase water on-chip cooling” using copper micro-channel coolers are being used but “two-phase on chip cooling” with refrigerants have a very large scale & long lasting advantages over the prior. However, due to the perceived complexity of modelling two-phase flow, this solution is not yet well understood. Modelling of two phase …

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An Invastigation Of Band-Limited Fluid Damper Configuration Using Lumped Parameter Modeling, Ye Hong Dec 2015

An Invastigation Of Band-Limited Fluid Damper Configuration Using Lumped Parameter Modeling, Ye Hong

Mechanical and Aerospace Engineering Theses - Archive

Vehicle suspension system is one of the key factors related to the vehicle dynamic characteristic. The fine tuning of suspension system between vehicle handling and ride comfort is not only a trade-off between these two aspects, but also, has its impact on vehicle safety and durability. For an optimal damper performance, the damper needs to generate sufficient damping force at maneuvering frequency (< 2 Hz); and it also needs to generate less damping force, which allow spring to filter the high frequency noise (> 2 Hz) generated by vehicle travels along rough road condition at speed. In order to achieve such performance, a lumped parameter model of Band-Limited Damper is proposed. Frequency response of both Conventional Damper and Band-Limited Damper are …

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Computational Analysis Of Enhancing Heat Transfer In A 3-D Stacked Die Using Different Finned Heat Sink, Deekshith Pittala Dec 2015

Computational Analysis Of Enhancing Heat Transfer In A 3-D Stacked Die Using Different Finned Heat Sink, Deekshith Pittala

Mechanical and Aerospace Engineering Theses - Archive

3D die stacking is an exciting new technology that increases the transistor’s density by integrating two or more dies vertically with a dense high – speed interface. The result of 3D die stacking is a significant reduction of interconnect both within a die and across dies in a system. The objective of the thermal design requirement for a 3D stacked die package is to maintain the junction temperatures of the devices at or below specified limits. Installing the Heat sink aid the heat transfer activity from a package. The extent of cooling and the junction temperatures vary if the designs …

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Developing And Validating Thermodynamic Models For Evaporative Cooling Employed In Data Centers, Niravkumar Prabhatsinh Dodia Dec 2015

Developing And Validating Thermodynamic Models For Evaporative Cooling Employed In Data Centers, Niravkumar Prabhatsinh Dodia

Mechanical and Aerospace Engineering Theses - Archive

Cooling of Data centers is of paramount importance for continuous and reliable operation of Servers housed by them. Considerable amount of total power is used to drive the cooling activity. Various different types of cooling methods have been implemented and are currently operating in various data centers. Evaporative (Indirect/Direct) Cooling is trending these days because of its ability to provide cooling at minimal cost. Previous studies have presented various cooling plants in data centers and studied them. A dedicated model for Evaporative cooling is developed and validated. The data is computed assuming the developed cooling model operating at a particular …

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Experimental Study On Effects Of Segregated Cooling Provisioning On Thermal Performance Of Information Technology Servers In Air Cooled Data Centers, Ashwin Venugopal Siddarth Dec 2015

Experimental Study On Effects Of Segregated Cooling Provisioning On Thermal Performance Of Information Technology Servers In Air Cooled Data Centers, Ashwin Venugopal Siddarth

Mechanical and Aerospace Engineering Theses - Archive

Modern Information Technology (IT) equipment are typically assumed to operate in quiescent airflow conditions in an uncontained data center facility. In this study, the multi-scaled thermal management strategies are reconsidered at the IT chassis and rack level for a containment system. For an ideal containment configuration of airflow provisioning the entirety of conditioned air provided by the Computer Room Air Conditioning (CRAC) unit would flow through the IT equipment and return back to the CRAC. But in actuality a lack of interfaced airflow distribution exists between the amount of conditioned air provisioned to the rack and the volume capacity ingested …

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A Model Analysis Of Sand Insertion In Hydraulic Fractures, Ya Hao Dec 2015

A Model Analysis Of Sand Insertion In Hydraulic Fractures, Ya Hao

Mechanical and Aerospace Engineering Theses - Archive

Hydraulic fracturing (fracking) is a well-stimulation technology to create large volume of fracture formation in rocks for gas and/or oil extraction. This technology has been applied to commercially exploit natural gas in unconventional shale reservoirs that contain immense quantity but low density of hydrocarbon sources. The productivity can be largely dependent on the connectivity of fractures that must stay open. However, upon initial hydraulic fracturing, the fractures would be closed due to high hydrostatic pressure deep inside the crust. Sand must be pumped into the fractures to keep them open. An in-depth understanding of the sand distribution and its dependence …

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Magnetic Field Enhanced Thermal Conductivity Analysis Of Magnetic Nanofluids, Christopher Allen Dec 2015

Magnetic Field Enhanced Thermal Conductivity Analysis Of Magnetic Nanofluids, Christopher Allen

Mechanical and Aerospace Engineering Theses - Archive

The magnetic properties of four water-based nanofluids consisting of Al2O3, CuO, Fe3O4, and SiO2 were exploited to analyze the effect of the application of an external magnetic field on the thermal conductivity of the nanofluid. When the magnetic field is applied, the magnetic dipole moments of the particles align and the particles come in contact with each other and form chains in the direction of the applied magnetic field. When parallel to the direction of heat flow, the magnetic field causes the effective thermal conductivity in the direction of the magnetic field to increase. A higher thermally conductive fluid can …

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Nanoparticle-Bridge Assay For Amplification-Free Electrical Detection Of Oligonucleotides, Manouchehr Teimouri Dec 2015

Nanoparticle-Bridge Assay For Amplification-Free Electrical Detection Of Oligonucleotides, Manouchehr Teimouri

Material Science and Engineering Dissertations - Archive

The aim of this research is to investigate a highly sensitive, fast, inexpensive, and field-applicable amplification-free nanoparticle-based oligonucleotide detection method which does not rely on any enzymatic or signal amplification process. In this approach, target oligonucleotide strands are detected through the formation of nanoparticle satellites which make an electrical path between two electrodes. This method enables an extremely sensitive oligonucleotide detection because even a few oligonucleotide strands can form a single nanoparticle satellite which can solely generates an electrical output signal. Results showed that this oligonucleotide detection method can detect oligonucleotide single strands at concentrations as low as 50 femtomolar …

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Material Changes Of Bone Following Ishcemia Of The Immature Femoral Head, Olumide O. Aruwajoye Dec 2015

Material Changes Of Bone Following Ishcemia Of The Immature Femoral Head, Olumide O. Aruwajoye

Material Science and Engineering Dissertations - Archive

Legg-Calvé-Perthes disease (LCPD) is a childhood hip disorder resulting from the loss of blood flow to the femoral head. In severe cases of the disease, the femoral head can develop a flattening deformity; additionally, if the disease is diagnosed at a later stage, it leaves most patients to develop early osteoarthritis of the hip. Due to a lack of pathological specimen from patients, an experimental piglet model of femoral head ischemia was developed. The model closely follows the radiographic changes seen in LCPD patients, where there is subchondral fracture, resorption, and a flattening deformity of the femoral head. After ischemia, …

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Merging Radar-Only Qpe And Rain Gauge Data Via Conditional Bias-Penalized Optimal Estimation, Beomgeun Kim Dec 2015

Merging Radar-Only Qpe And Rain Gauge Data Via Conditional Bias-Penalized Optimal Estimation, Beomgeun Kim

Civil Engineering Theses - Archive

A new technique for merging radar precipitation estimates and rain gauge data is developed and evaluated to improve multisensor quantitative precipitation estimation (QPE). Various types of linear and nonlinear techniques have been used to combine rain gauge and radar data. Linear cokriging and its variants, for example, may be considered as the best linear unbiased estimators which minimize the error variance in the unconditional sense. They are, however, subject to conditional biases (CB) that may be unacceptably large for estimation of heavy-to-extreme precipitation. In this work, I develop, apply, and evaluate conditional bias-penalized cokriging (CBPCK) for spatial estimation of precipitation …

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Experimental Investigation Of Heat Leakage And Air Leakage In Domestic Refrigerators, Shervin Shoai Naini Dec 2015

Experimental Investigation Of Heat Leakage And Air Leakage In Domestic Refrigerators, Shervin Shoai Naini

All Theses

The optimization of the energy consumption in household refrigerators should consider the influence of the gasket which determines the heat transfer and air infiltration rate. In this research project, engineering methods are developed to evaluate the heat leakage due to the gasket and air infiltration in domestic refrigerators. In the first study, experimental and numerical approaches are applied to evaluate the gasket heat transfer based on the “Reverse Heat Load Method”. The main objective is to find the effective heat leakage with the dimensions of energy leakage per gasket length per temperature difference (W/m.K). An insulated cubic box with a …

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Parking Lot Monitoring System Using An Autonomous Quadrotor Uav, Venkataraman Ganesh Dec 2015

Parking Lot Monitoring System Using An Autonomous Quadrotor Uav, Venkataraman Ganesh

All Theses

The main goal of this thesis is to develop a drone-based parking lot monitoring system using low-cost hardware and open-source software. Similar to wall-mounted surveillance cameras, a drone-based system can monitor parking lots without affecting the flow of traffic while also offering the mobility of patrol vehicles. The Parrot AR Drone 2.0 is the quadrotor drone used in this work due to its modularity and cost efficiency. Video and navigation data (including GPS) are communicated to a host computer using a Wi-Fi connection. The host computer analyzes navigation data using a custom flight control loop to determine control commands to …

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Effect On Mechanical Properties Of Aluminium Alloy Composites On Adding Ash As Reinforcement Material, Mohd Zafaruddin Khan, Mohd Anas, Ather Hussain, Md Irshadul Haque, Kamran Rasheed Dec 2015

Effect On Mechanical Properties Of Aluminium Alloy Composites On Adding Ash As Reinforcement Material, Mohd Zafaruddin Khan, Mohd Anas, Ather Hussain, Md Irshadul Haque, Kamran Rasheed

Journal of Metals, Materials and Minerals

To produce Al-matrix cast particle composites, wettability of the ceramic particles by liquid Al is essential. To improve wettability of the solution, few elements such as Mg and Si are added into Al melt to incorporate the ceramic particles. The present investigation has been focussed on the utilization of abundant available industrial waste such as fly ash and bagasse ash in useful manner by dispersing it into Eutectic Al-Si alloy LM6 Containing 10.58% Si to produce composites by liquid casting route. The mechanical properties such as Brinell Hardness and Ultimate tensile strength has been investigated. The test results of the …

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Effect Of Temperature Dropping During Solution Treatment In Rejuvenation Heat Treatment On Final Microstructures Of Udimet 520, Kritsayanee Saelor, Panyawat Wangyao Dec 2015

Effect Of Temperature Dropping During Solution Treatment In Rejuvenation Heat Treatment On Final Microstructures Of Udimet 520, Kritsayanee Saelor, Panyawat Wangyao

Journal of Metals, Materials and Minerals

Udimet 520 is a low precipitation hardened nickel-based superalloy, which is made to be turbine blades at high temperature. After long-term service, the microstructure of the turbine blades could be degraded, then the mechanical properties are worse than the new ones. The rejuvenation heat treatment of degraded turbine blades, which are made of cast Udimet 520, is following by solution treatment at 1,121C / 4 hours and then double aging processes, which include primary aging at 843 C / 24 hours and secondary aging at 760 C / 16 hours, respectively.However, in practical reheat treatment processes, the temperature during solution …

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Distributed Algorithms For Electric Vehicle Charging, Akshay Malhotra Dec 2015

Distributed Algorithms For Electric Vehicle Charging, Akshay Malhotra

Electrical Engineering Theses - Archive

Coordinated charging of plug-in electric vehicles (PEVs) can effectively mitigate the negative effects imposed on the power distribution grid by uncoordinated charging. Simultaneously, coordinated charging algorithms can accommodate the PEV user’s needs in terms of desired state-of-charge and charging time. In this work, the problem of tracking an arbitrary power profile, by coordinated charging of PEVs, is formulated as a discrete scheduling process, while accounting for the heterogeneity in charging rates and restricting the charging to only the maximum rated power. Then, a novel distributed algorithm is proposed to coordinate the PEV charging and eliminate the need for a central …

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Reducing Encoder Complexity Of Intra-Mode Decision Using Cu Early Termination Algorithm, Nishit Samirbhai Samirbhai Shah Dec 2015

Reducing Encoder Complexity Of Intra-Mode Decision Using Cu Early Termination Algorithm, Nishit Samirbhai Samirbhai Shah

Electrical Engineering Theses - Archive

In this thesis an intra prediction algorithm is proposed that terminates complete full search prediction for the CU and is replaced by CU early termination algorithm which determines the complexity of the CU block and then decision is made to further split or non-split the CU. When the CU texture is complex the CU is split into smaller sub units to find the best size and when the CU texture is flat, the CU is not divided further into sub – units. Down sampling is done first after which complexity is calculated by which a threshold value is set. This …

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H.265 (Hevc) Bitstream To H.264 (Mpeg 4 Avc) Bitstream Transcoder, Deepak Hingole Dec 2015

H.265 (Hevc) Bitstream To H.264 (Mpeg 4 Avc) Bitstream Transcoder, Deepak Hingole

Electrical Engineering Theses - Archive

With every new video coding standard the general rule of thumb has been to maintain same video quality at a reduced bit rate of about 50% as compared to the previous standard. H.265 is the latest video coding standard with support for encoding videos with wide range of resolutions, starting from low resolution to beyond High Definition i.e. 4k or 8k. H.265 also known as HEVC was preceded by H.264 which is very well established and widely used standard in industry and finds its applications in broadcast, storage, multimedia telephony. Currently almost all devices including low power handheld mobile devices …

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Sparse Signal Reconstruction In Linear Inverse Scattering Problem, Tanmoy Bhowmik Dec 2015

Sparse Signal Reconstruction In Linear Inverse Scattering Problem, Tanmoy Bhowmik

Electrical Engineering Theses - Archive

Proper mathematical modeling of inverse scattering problem is of utmost importance in applications such as optical imaging and microscopy, radar, acoustic, seismic and medical imaging. However, the problem is non-linear and ill-posed due to the diffusive nature of wave propagation through the scattering medium. Born and Rytov approximation are two widely used techniques to linearize the inverse scattering problem that simplifies the mathematics and modeling of wave propagation through scattering medium in special cases. The linear inverse scattering problem is still severely ill-posed and hence, in general, the solution is not stable and unique, unless a priori knowledge about the …

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