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Articles 1381 - 1410 of 3180

Full-Text Articles in Engineering

Analysis Of Composite Beams With Airfoil Cross-Sections With I-Section Stiffener Under Tension And Bi-Directional Moments, Peter Louis Leboulluec Aug 2016

Analysis Of Composite Beams With Airfoil Cross-Sections With I-Section Stiffener Under Tension And Bi-Directional Moments, Peter Louis Leboulluec

Mechanical and Aerospace Engineering Dissertations - Archive

Annual wind power generation capacity in the US has increased from 3 gigawatts in 2000 to 61 gigawatts in 2013 and is on track to fulfill 20% of projected U.S. electricity needs (305 gigawatts) by 2030. To enable the increase in electricity generation of wind turbines, longer blades are being designed which require improved engineered blades to handle higher loads. Thus, the wind turbine industry is turning to the use of carbon-epoxy composite materials to take advantage of their low weight yet high strength ratio and improved fatigue resistance. Current analyses to design turbine blades utilize either Finite Element Analysis …

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Thermal Energy Storage For Expanded Use Of Data Center Indirect/Direct Evaporative Cooling, Jefferey Luttrell Aug 2016

Thermal Energy Storage For Expanded Use Of Data Center Indirect/Direct Evaporative Cooling, Jefferey Luttrell

Mechanical and Aerospace Engineering Dissertations - Archive

Computer cooling system design evolved over time with goals of increasing efficiency and decreasing cost. Early computers were essentially hand-built and very expensive. Reliable operation required aggressive cooling to maintain acceptable component temperatures and this was achieved with relatively low ventilation air temperatures. With time, the scale of operations increased to the point that operating cost began to strongly influence design decisions. Computer room air conditioners consumed substantial amounts of electrical power, in some situations almost as much power as the computer equipment. One cost saving idea used outside air when the ambient temperature fell below the normal cooling supply …

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Understanding The Alchemilla Leaf And Its Hydrophobicity, Atul Mohandas Kootathil Aug 2016

Understanding The Alchemilla Leaf And Its Hydrophobicity, Atul Mohandas Kootathil

Mechanical and Aerospace Engineering Theses - Archive

The Alchemilla leaf has been well known and studied frequently for its hydrophobic ability. However, much difficulty has been met in replicating its microstructure for hydrophobic applications. Also, not much experimental data was found on the behavior of leaf’s microstructure. Gathering information from experimental results may provide new understanding of its wetting properties before attempting to mimetic its wetting behavior. In this research, the focus is to detail the observed solid-water-air interaction on Alchemilla leaf by simulating condensation, evaporation and rainfall conditions, which are the common ways that a plant may interact with water drops in nature. Documenting these observations …

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Attitude Stabilization Of Spacecraft Using Moving Masses, Juran Hwang Aug 2016

Attitude Stabilization Of Spacecraft Using Moving Masses, Juran Hwang

Mechanical and Aerospace Engineering Theses - Archive

This research investigates the ability of stabilizing spacecraft rotational motion by internal mass actuation. The mass actuation mechanism consists of three internal masses placed along the three axes at some offset distance that can move to induce inertial forces and moments and change the inertia matrix and center of mass. A set of nonlinear equations of motion are developed to model the motion, both orbital and rotational dynamics and kinematics, of a spacecraft with mass and inertial variation due to internal mass actuation, under the gravitational field of Earth. The equations inherently include the inertia effect of the mass motion …

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Developing And Validating Energy Models For Indirect And Direct Evaporative Cooling Used In Datacenters, Rajesh Kasukurthy Aug 2016

Developing And Validating Energy Models For Indirect And Direct Evaporative Cooling Used In Datacenters, Rajesh Kasukurthy

Mechanical and Aerospace Engineering Theses - Archive

In the present day to day life, Internet of things is everything, i.e., we need internet and telecommunication for almost every task of our life and these require data from data centers. These data centers provide various facilities like data processing, storage, and transmission, and maintenance, operations etc., for performing these tasks, a huge amount of power is consumed by the data center, which in turn generates large amount of heat. As these data centers are to be made operational throughout the year, cooling of data centers is of utmost importance. These cooling systems like air conditioners, economizers and evaporative …

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Mechanical Property Evaluation Of Magnesium Rich Primer Coating System Over Aa 2024 T-3 Aluminum Alloy By Nano-Inedntation, Hongyi Qu Aug 2016

Mechanical Property Evaluation Of Magnesium Rich Primer Coating System Over Aa 2024 T-3 Aluminum Alloy By Nano-Inedntation, Hongyi Qu

Mechanical and Aerospace Engineering Theses - Archive

Aluminum alloy is widely used as a major structural material, such as for wing and fuselage, in aerospace industry. Corrosion is the most insidious form of damage to aluminum alloy, which can cause aircraft structure damage and related safety issue. Coating is generally used in industry to protect metal structure. An alternative to present toxic chromium primer coating system, magnesium rich primer (MgRP) has been developed to protect AA 2024 T-3. Studies have demonstrated the anti-corrosion performance of MgRP. However, the interlayer material heterogeneity can affect the mechanical properties of coating such as modulus, hardness and interfacial behavior. In the …

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Active Torque Vectoring For All Wheel Drive Fsae Electric Car, Vikas Tukaram T Pawar Aug 2016

Active Torque Vectoring For All Wheel Drive Fsae Electric Car, Vikas Tukaram T Pawar

Mechanical and Aerospace Engineering Theses - Archive

UTA Racing is known for building well-engineered FSAE racecars. This year team is building, its first electric car by using AWD in-wheel motor concept car E-16. All wheel drive electric vehicles has an ability to apply instantaneous torque to all four wheels permit increased car performance. An ‘Active Model Based Torque Vectoring System controller’ is designed to realize this objective. The controller was designed to replicate three electronically controlled LSD's on an all-wheel drive platform with different control strategies. This was achieved based on the principal of distributing total driver requested torque between wheels, equivalent to the percentage of the …

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Guidance Navigation And Control Implementation For Unmanned Ground Vehicle Using Ni-Myrio, Ishwarya Srinivasan Aug 2016

Guidance Navigation And Control Implementation For Unmanned Ground Vehicle Using Ni-Myrio, Ishwarya Srinivasan

Mechanical and Aerospace Engineering Theses - Archive

This research effort aims at investigating alternative real-time implementation software and hardware for Guidance, Navigation and Control (GNC) algorithms for an Unmanned Ground Vehicle (UGV). A GNC algorithm was previously developed for a skid-steered tracked UGV to go through assigned waypoints based on encoder counts. The UGV has two electric motors driving the tracks on each side and two encoders providing the speeds of the drive wheels. This algorithm was implemented using Matlab/Simulink-based model running on a mini computer, interfacing with the electric motors and encoders through a specialty control board. This current effort is to implement the same GNC …

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Fitting B-Splines Curves To Coarse Data Cloud Using Modified Squared Distance Minimization Method, Vinay Vivek Mhala Aug 2016

Fitting B-Splines Curves To Coarse Data Cloud Using Modified Squared Distance Minimization Method, Vinay Vivek Mhala

Mechanical and Aerospace Engineering Theses - Archive

Additive manufacturing has made us realize that we can fabricate complex shapes that were difficult to manufacture with subtractive processes. Topology optimizations results have complex shapes and have rough surfaces which are difficult to manufacture even by additive manufacturing. To automate the process of converting rough surfaces into smooth surfaces for the benefit of manufacturability would be very desirable. Computing curve segments to approximate point cloud data that represents rough surfaces and then lofting it to have a smooth surface seems to be a promising methodology to achieve automation. We implement B-spline formulation along with Pottmann’s iterative method based on …

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Study Of Crack Propagation Under Thermal Loading On A 3d Tsv Package, Subramanian R. Gowtham Aug 2016

Study Of Crack Propagation Under Thermal Loading On A 3d Tsv Package, Subramanian R. Gowtham

Mechanical and Aerospace Engineering Theses - Archive

Today, there is a revolution in going for miniaturization in size of electronic packages. More thinner, lighter and complex packages are in use for almost every electronic device. This initiation was taken to the next level and gives us a whole new ideology called 3D packaging. Currently, 3D packaging is the on-going research in almost all the electronic packaging related industries. 3D package uses Through Silicon Via (TSV) technology that gained momentum in the development and helped packaging system for significant miniaturization and power reduction, which result in increased performance. However, the reliability assessment is needed to evaluate the critical …

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Gold-Nanoparticle-Based Theranostic Agents For Radiotherapy Of Malignant Solid Tumors, Sina Moeendarbari Aug 2016

Gold-Nanoparticle-Based Theranostic Agents For Radiotherapy Of Malignant Solid Tumors, Sina Moeendarbari

Material Science and Engineering Dissertations - Archive

Radiation therapy is one of the three major methods of cancer treatment. The fundamental goal of radiotherapy is to deliver high radiation doses to targets while simultaneously minimizing doses to critical structures and healthy normal tissues. The aim of this study is to develop a general, practical, and facile method to prepare nanoscale theranostic agents for more efficacious radiation therapy with less adverse side effects. First, a novel type of gold nanoparticle, hollow Au nanoparticles (HAuNPs) which was synthesized using the unique bubble template synthesis method developed in our lab, are studied in vitro and in vivo to investigate their …

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Osteogenic Differentiation In Preosteoblast Mc3t3-E1 Cells Induced By Beta Tricalcium Phosphate Bioglass Composite, Chien-Ning Yao Aug 2016

Osteogenic Differentiation In Preosteoblast Mc3t3-E1 Cells Induced By Beta Tricalcium Phosphate Bioglass Composite, Chien-Ning Yao

Material Science and Engineering Theses - Archive

The use of bioactive material from bioceramic and composite components to support bone cell and tissue growth is an interesting area of medical field. Calcium phosphate ceramics are biocompatible and may develop interactions with human living bone tissues. Bioactive calcium phosphates, beta -tricalcium phosphate (β-TCP), have been intensively investigated as the cell scaffold for bone tissue engineering because it is well recognized that they are compatible to natural bone tissue and osteoconductive. In this research we will discuss two types of biomaterial with different kind of composition—(a) a cement type and (b)a scaffold type of biomaterial that can be applied …

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Mechanism Of Wear And Tribofilm Formation With Ionic Liquids And Ashless Antiwear Additives, Vibhu Sharma Aug 2016

Mechanism Of Wear And Tribofilm Formation With Ionic Liquids And Ashless Antiwear Additives, Vibhu Sharma

Material Science and Engineering Dissertations - Archive

Increasingly stringent government regulation on emissions (EPA Emissions Standard Reference Guide and latest CAFE standards requiring an average fuel economy of 54.5 mpg (combined cars and trucks) by 2025) impose significant challenges to the automotive and lubricant industries calling for the development and implementation of lower viscosity ILSAC GF-5&6 and API-CJ4&5 oils which further limit the amount of SAPS and deposits in engines. Development of additives that result in lower ash content, volatility and anti-wear property plays a crucial role in being able to reach these standards. The current industrial additive technology i.e. zinc dialkyldithiophosphate (ZDDP) forms harmful deposits on …

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Functional Studies Of The Human Telomerase Holoenzyme, Mohammed E. Sayed Aug 2016

Functional Studies Of The Human Telomerase Holoenzyme, Mohammed E. Sayed

Bioengineering Dissertations - Archive

Telomeres are the DNA structures that cap the ends of linear chromosomes. In humans, telomeres are composed of the hexameric repeats TTAGGG. The reverse transcriptase, telomerase maintains the telomeres by adding the TTAGGG repeats to the chromosomes during cell division. In the absence of telomerase, telomere length limits the self-renewal capabilities of cells. Telomerase is expressed in approximately 90% of all human cancers, making it an almost universal therapeutic target as well as an important player in the progression from healthy to cancerous cell. The biophysical studies discussed in this thesis focus on expanding the understanding of the function and …

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Intuitive Human Robot Interfaces For Upper Limb Prosthetics, Oguz Yetkin Aug 2016

Intuitive Human Robot Interfaces For Upper Limb Prosthetics, Oguz Yetkin

Bioengineering Dissertations - Archive

Modern robotic prosthetic devices for upper limb amputees promise to alleviate an important disability, but are underutilized due to the inability to properly control them. Specifically, the devices afford more degrees of freedom (DOFs) than are con- trollable by easily decoded biological signals. These devices, such as the DEKA arm, can have as many as 18 DOFs, although six is a more typical number (control of each finger plus thumb rotation). Unfortunately, the use of these devices remains limited by the ability of users to simultaneously control more than one degree of freedom at a time with commercially deployed technology. …

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Centimeter-Deep Tissue Fluorescence Microscopic Imaging, Bingbing Cheng Aug 2016

Centimeter-Deep Tissue Fluorescence Microscopic Imaging, Bingbing Cheng

Bioengineering Dissertations - Archive

Fluorescence microscopic imaging in centimeter-deep tissue has been highly sought-after for many years because much interesting in vivo micro-information—such as microcirculation, tumor angiogenesis, and cancer metastasis—may deeply locate in tissue. However, it is very challenging because of strong tissue light scattering. This includes: how to confine the fluorescence emission into a small volume to achieve high spatial resolution; how to increase fluorescence emission efficiency to compensate the signal attenuation caused by small emission volume and tissue scattering/absorption; and how to reduce background fluorescence noise and exclusively differentiate signal photons from background photons to increase signal-to-noise ratio (SNR) and sensitivity. Ultrasonic …

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Evaluation And Development Of A Structurally Enhanced Pvc Water Pipe, Ameya Brahmanand Paradkar Aug 2016

Evaluation And Development Of A Structurally Enhanced Pvc Water Pipe, Ameya Brahmanand Paradkar

Civil Engineering Dissertations - Archive

Many U.S. utilities rely upon iron pipe to deliver water through their distribution network. It has only been in the past 50 years that other products have penetrated into the water utilities' pipeline. The industry has turned to various cementitious and plastic materials largely to overcome aggressive soil and water that can be corrosive to metallic pipes. This dissertation will discuss a new pipe material called iPVC pipe manufactured by Pyunghwa Pipe Industry Inc. (PPI), South Korea. The iPVC pipe was evaluated by a series of selective testing on the pipe, including impact, stiffness, tensile, short-term hydrostatic burst pressure, fatigue …

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Nanosturctured Biomaterials For Tissue Regeneration And Repair, Primana Punnakitikashem Aug 2016

Nanosturctured Biomaterials For Tissue Regeneration And Repair, Primana Punnakitikashem

Bioengineering Dissertations - Archive

Nanostructured materials have been explored in biomedical field especially in tissue engineering over a past decade. This type of material can be processed into biomaterial scaffolds; revealed many advantages to be used in human living system such as restoring, healing, replacing and improving the function of interested tissues or organs. In this work, nanostructured materials were synthesized as a nanofibrous scaffold or nanoparticles, which were characterized and tested for their biofunctions in the regeneration of blood vessels, lung and skin tissues. Firstly, biodegradable polyurethane nanofibrous scaffolds with dipyramole were electrospun to create a vascular graft, and results demonstrated that this …

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Numerical And Experimental Investigation Of Buried Large-Diameter Steel Pipes With Controlled Low-Strength Material, Margarita Takou Aug 2016

Numerical And Experimental Investigation Of Buried Large-Diameter Steel Pipes With Controlled Low-Strength Material, Margarita Takou

Civil Engineering Dissertations - Archive

The main goal of this research was to gain an in-depth understanding of the behavior of buried large-diameter pipes with controlled low-strength material (CLSM). Design equations were developed based on extensive parametric studies that aimed for an optimized design for designers in industry. Both experimental and numerical methods were espoused in the investigating procedure. The pipe-soil structure characteristics of the experimental analysis were: (a) steel pipe diameter of 108 in., (b) steel pipe thickness of 0.47 in., (c) mortar liner applied at the inner surface of the pipe with thickness of 0.5 +1/6 in., (d) CLSM applied around the pipe …

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Calibration Of Mepdg Performance Models For Flexible Pavement Distresses To Local Conditions Of Ontario, Nelson Fernando Cunha Coelho Aug 2016

Calibration Of Mepdg Performance Models For Flexible Pavement Distresses To Local Conditions Of Ontario, Nelson Fernando Cunha Coelho

Civil Engineering Theses - Archive

The implementation of the American Association of State Highway and Transportation Officials (AASHTO) Mechanistical-Empirical Pavement Design requires the development of a design procedure that can be used by the agencies and engineering consultants to design new and reconstructed rigid and flexible pavements. To calibrate the design procedure for a region, a large dataset representing the particular local conditions is needed. It includes traffic, climate, site material characteristics, performance requirements and historical data. The performance models were calibrated in North America using the Long Term Pavement Database Program (LTPP), therefore, the models must be calibrated to local conditions in order to …

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Mapping Of Prefrontal Hemodynamic Responses To Noxious Stimulation And Chronic Pain Related Resting-State Functional Networks Assessed By Fnirs, Amarnath Yennu Aug 2016

Mapping Of Prefrontal Hemodynamic Responses To Noxious Stimulation And Chronic Pain Related Resting-State Functional Networks Assessed By Fnirs, Amarnath Yennu

Bioengineering Dissertations - Archive

Neural representations of chronic pain are complex and are least understood. Numerous magnetic resonance imaging (MRI) studies have revealed structural and functional abnormalities in several cortical and sub-cortical regions in subjects with chronic low-back pain (CLBP). A more recent MRI study has reported that structural and functional brain abnormalities in pain-treated patients with CLBP are reversible, demonstrating that an appropriate treatment of chronic pain can restore normal brain functions for the patients. Due to high cost, non-portability, and other restrictions of MRI, the development of a complementary brain imaging tool is therefore crucial in order to improve the understanding of …

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Integrated Evaluation Of Greenhouse Gas Emissions, Traditional Air Pollutants, And Economics Of Three Types Of Landfills, Reza Broun Aug 2016

Integrated Evaluation Of Greenhouse Gas Emissions, Traditional Air Pollutants, And Economics Of Three Types Of Landfills, Reza Broun

Civil Engineering Dissertations - Archive

Despite the decreasing rate of landfilled waste due to increases in reuse and recycling, landfilling remains an enormous part of the waste industry of the United States due to population and economic growth. In addition, certain wastes are not easily recycled due to their mixed composition (i.e. a cardboard carton with a plastic lining) or their contamination (i.e. diapers). The primary goal of this research is to develop a comprehensive framework that can help landfill designers chose the best type of landfill (conventional, bioreactor, or aerobic) for a given situation based on greenhouse gas (GHG) emissions, traditional air pollutants and …

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A Decision Support System For Traffic Diversion Around Construction Closures, Arezoo Memarian Aug 2016

A Decision Support System For Traffic Diversion Around Construction Closures, Arezoo Memarian

Civil Engineering Dissertations - Archive

As highway infrastructure ages and road congestion increases, roads need to be expanded and reconstructed. It results in creating many construction sites and work zones on highways, which leads to an unavoidable interruption in normal traffic flows and have resulted in traffic congestion, more vehicle emissions, and traffic safety problems. During roadway construction, when lanes or entire highway sections must be temporarily closed, traffic managers would like to inform motorists of alternative routes around the construction site well in advance of the project location. This would help reduce traffic demand through the construction site, enhance the safety of the workers …

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Group Assignment And Annual Average Daily Traffic Estimation Of Short-Term Traffic Counts Using Gaussian Mixture Modeling And Neural Network Models, Sunil Kumar Madanu Aug 2016

Group Assignment And Annual Average Daily Traffic Estimation Of Short-Term Traffic Counts Using Gaussian Mixture Modeling And Neural Network Models, Sunil Kumar Madanu

Civil Engineering Dissertations - Archive

The grouping of similar traffic patterns and cluster assignment process represent the most critical steps in AADT estimation from short-term traffic counts. Incorrect grouping and assignment often become a significant source of AADT estimation errors. For instance, grouping a commuter traffic trend pattern into a recreational traffic trend may produce an erroneous AADT value. The traditional knowledge-based methods, often aided with visual interpretation, introduce subjective bias while grouping traffic patterns. In addition, the grouping requires personnel resources to process large amounts of data and remains inefficient with unapparent traffic patterns. The functional class grouping, a traditional method, also produces larger …

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Evaluation Of Food Waste Diversion Potential And Economics Of Using Food Waste Dehydrators, Arindam Dhar Aug 2016

Evaluation Of Food Waste Diversion Potential And Economics Of Using Food Waste Dehydrators, Arindam Dhar

Civil Engineering Theses - Archive

According to US EPA (2013), food waste is the second largest component (14.6%) of MSW composition in the US, preceded only by paper. Apart from the negative environmental impacts of food waste through methane and leachate generation, it also incurs huge cost to landfill them. Hence, food waste diversion from landfills is becoming a major issue in landfills across many US states. Though biological treatment of food waste is a potential alternative for food waste diversion, the existing scale of this type of treatment is very narrow. On-site treatment of food waste is a suitable alternative as it can be …

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Ac Arc Flash Light Intensity Estimator And Mhd Based Dc Arc Model, Shiuan-Hau Rau Aug 2016

Ac Arc Flash Light Intensity Estimator And Mhd Based Dc Arc Model, Shiuan-Hau Rau

Electrical Engineering Dissertations - Archive

Since the light emitted by arc flash is significantly brighter than the normal lighting background, the light sensors have been applied to the arc flash detection. Currently, the optically based arc flash relaying has been considered as the fastest available protection for arc flash hazard reduction. Although it is well known that high intensity light will be emitted during arc flash event and the human delicate eye structures, such as retina or cornea, can be damaged by the sudden bright light, there are limited research providing the quantitative light intensity estimation during different arcing incidents. This dissertation proposes an arc …

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Time-Triggered Controller Area Network Design For Formula Sae Racecars And Technique For Measuring Cpu Usage On Systems With Nested And Non-Nested Interrupts, Randy Kyle Long Aug 2016

Time-Triggered Controller Area Network Design For Formula Sae Racecars And Technique For Measuring Cpu Usage On Systems With Nested And Non-Nested Interrupts, Randy Kyle Long

Electrical Engineering Theses - Archive

This document presents a design method and example for a time-triggered CAN (TTCAN) system which reduces latency, variability in transmission frequency, and increases data throughput relative to the traditional free-for-all CAN (FFACAN) transmission system. In addition to performance considerations for a TTCAN transmission scheme, this document also presents a simple method for measuring CPU usage on embedded systems that use either nested or non-nested interrupts. Systems that use non-nested interrupts may have their performance measured with a single GPIO pin; systems that use nested interrupts require one pin per interrupt service routine.

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Embedding Antenna Shear/Pressure Sensors In Prosthetic Liner Material, Shahanavaz Eilbeigi Aug 2016

Embedding Antenna Shear/Pressure Sensors In Prosthetic Liner Material, Shahanavaz Eilbeigi

Mechanical and Aerospace Engineering Theses - Archive

Published surveys indicated that 40-60% of prosthesis users experience discomfort and skin problems. These studies highlighted the needs for enhanced prosthetic performance and fit. It is extremely difficult to address these problems due to two reasons: first, ambulation create varying areas of shear and pressure on the residual limb, but it is not clear which shear/pressure combinations are acceptable and what is the safe stress level for users. In addition, the volume of the residual limb changes throughout the day and activity level. Therefore, there is a strong need to develop a light, thin, flexible, and wirelessly interrogated sensor for …

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The Characterization Of Secondary Lithium-Ion Battery Degradation When Operating Complex, Ultra-High Power Pulsed Loads, Derek N. Wong Aug 2016

The Characterization Of Secondary Lithium-Ion Battery Degradation When Operating Complex, Ultra-High Power Pulsed Loads, Derek N. Wong

Material Science and Engineering Dissertations - Archive

The US Navy is actively developing all electric fleets, raising serious questions about what is required of onboard power supplies in order to properly power the ship’s electrical systems. This is especially relevant when choosing a viable power source to drive high power propulsion and electric weapon systems in addition to the conventional loads deployed aboard these types of vessels. Especially when high pulsed power loads are supplied, the issue of maintaining power quality becomes important and increasingly complex. Conventionally, a vessel’s electrical power is generated using gas turbine or diesel driven motor-generator sets that are very inefficient when they …

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Impact Of Wet-Dry Cycle On Mechanical Properties Of Expansive Clay Under Low Overburden Stress, Md Ashrafuzzaman Khan Aug 2016

Impact Of Wet-Dry Cycle On Mechanical Properties Of Expansive Clay Under Low Overburden Stress, Md Ashrafuzzaman Khan

Civil Engineering Theses - Archive

The seasonal variation in the water content termed as drying-wetting cycle is one of the most important environmental factor that may cause the degradation of strength for expansive clay. Highway embankment within the north Texas region are mostly constructed on expansive clay and shallow slope failures pose a significant maintenance problem for the Texas Department of Transportation (TxDOT). Understanding the strength loss mechanism of the expansive clay will provide some useful guidelines to design embankment with adequate factor of safety for long term drained condition. Impact of wet-dry cycle on the high plastic clay strength was measured by several researchers …

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