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Articles 2341 - 2370 of 9606
Full-Text Articles in Engineering
Fitting B-Splines Curves To Coarse Data Cloud Using Modified Squared Distance Minimization Method, Vinay Vivek Mhala
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 …
Study Of Crack Propagation Under Thermal Loading On A 3d Tsv Package, Subramanian R. Gowtham
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 …
Gold-Nanoparticle-Based Theranostic Agents For Radiotherapy Of Malignant Solid Tumors, Sina Moeendarbari
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 …
Osteogenic Differentiation In Preosteoblast Mc3t3-E1 Cells Induced By Beta Tricalcium Phosphate Bioglass Composite, Chien-Ning Yao
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 …
Mechanism Of Wear And Tribofilm Formation With Ionic Liquids And Ashless Antiwear Additives, Vibhu Sharma
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 …
Functional Studies Of The Human Telomerase Holoenzyme, Mohammed E. Sayed
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 …
Intuitive Human Robot Interfaces For Upper Limb Prosthetics, Oguz Yetkin
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. …
Centimeter-Deep Tissue Fluorescence Microscopic Imaging, Bingbing Cheng
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 …
Evaluation And Development Of A Structurally Enhanced Pvc Water Pipe, Ameya Brahmanand Paradkar
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 …
Nanosturctured Biomaterials For Tissue Regeneration And Repair, Primana Punnakitikashem
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 …
Numerical And Experimental Investigation Of Buried Large-Diameter Steel Pipes With Controlled Low-Strength Material, Margarita Takou
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 …
Calibration Of Mepdg Performance Models For Flexible Pavement Distresses To Local Conditions Of Ontario, Nelson Fernando Cunha Coelho
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 …
Mapping Of Prefrontal Hemodynamic Responses To Noxious Stimulation And Chronic Pain Related Resting-State Functional Networks Assessed By Fnirs, Amarnath Yennu
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 …
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 …
A Decision Support System For Traffic Diversion Around Construction Closures, Arezoo Memarian
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 …
Group Assignment And Annual Average Daily Traffic Estimation Of Short-Term Traffic Counts Using Gaussian Mixture Modeling And Neural Network Models, Sunil Kumar Madanu
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 …
Nanoparticle-Based Electrochemical Sensors For The Detection Of Lactate And Hydrogen Peroxide, Aytekin Uzunoglu
Nanoparticle-Based Electrochemical Sensors For The Detection Of Lactate And Hydrogen Peroxide, Aytekin Uzunoglu
Open Access Dissertations
In the present study, electrochemical sensors for the detection of lactate and hydrogen peroxide were constructed by exploiting the physicochemical properties of metal ad metal oxide nanoparticles. This study can be divided into two main sections. While chapter 2, 3, and 4 report on the construction of electrochemical lactate biosensors using CeO2 and CeO2-based mixed metal oxide nanoparticles, chapter 5 and 6 show the development of electrochemical hydrogen peroxide sensors by the decoration of the electrode surface with palladium-based nanoparticles. First generation oxidase enzyme-based sensors suffer from oxygen dependency which results in errors in the response current of the sensors …
Evaluation Of Food Waste Diversion Potential And Economics Of Using Food Waste Dehydrators, Arindam Dhar
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 …
Ac Arc Flash Light Intensity Estimator And Mhd Based Dc Arc Model, Shiuan-Hau Rau
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 …
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.
Embedding Antenna Shear/Pressure Sensors In Prosthetic Liner Material, Shahanavaz Eilbeigi
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 …
The Characterization Of Secondary Lithium-Ion Battery Degradation When Operating Complex, Ultra-High Power Pulsed Loads, Derek N. Wong
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 …
Impact Of Wet-Dry Cycle On Mechanical Properties Of Expansive Clay Under Low Overburden Stress, Md Ashrafuzzaman Khan
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 …
Osem : Occupant-Specific Energy Monitoring., Anand S. Kulkarni
Osem : Occupant-Specific Energy Monitoring., Anand S. Kulkarni
Electronic Theses and Dissertations
Electricity has become prevalent in modern day lives. Almost all the comforts people enjoy today, like home heating and cooling, indoor and outdoor lighting, computers, home and office appliances, depend on electricity. Moreover, the demand for electricity is increasing across the globe. The increasing demand for electricity and the increased awareness about carbon footprints have raised interest in the implementation of energy efficiency measures. A feasible remedy to conserve energy is to provide energy consumption feedback. This approach has suggested the possibility of considerable reduction in the energy consumption, which is in the range of 3.8% to 12%. Currently, research …
A Non-Invasive Diagnostic System For Early Assessment Of Acute Renal Transplant Rejection., Mohamed Nazih Mohamed Ibrahim Shehata
A Non-Invasive Diagnostic System For Early Assessment Of Acute Renal Transplant Rejection., Mohamed Nazih Mohamed Ibrahim Shehata
Electronic Theses and Dissertations
Early diagnosis of acute renal transplant rejection (ARTR) is of immense importance for appropriate therapeutic treatment administration. Although the current diagnostic technique is based on renal biopsy, it is not preferred due to its invasiveness, recovery time (1-2 weeks), and potential for complications, e.g., bleeding and/or infection. In this thesis, a computer-aided diagnostic (CAD) system for early detection of ARTR from 4D (3D + b-value) diffusion-weighted (DW) MRI data is developed. The CAD process starts from a 3D B-spline-based data alignment (to handle local deviations due to breathing and heart beat) and kidney tissue segmentation with an evolving geometric (level-set-based) …
Microfluidic Platform For Impedance Characterization Of Endothelial Cells Under Fluid Shear Stress., Vanessa Velasco
Microfluidic Platform For Impedance Characterization Of Endothelial Cells Under Fluid Shear Stress., Vanessa Velasco
Electronic Theses and Dissertations
Endothelium dysfunction has been associated with many pathophysiological processes leading to cardiovascular diseases. Studying endothelium behavior is vital to understand the onset, prevention, and treatment of such diseases. Electrical impedance spectroscopy has been shown to provide a real-time in vitro evaluation of cell behavior including cell monolayer permeability. However, the majority of published work has been primarily with static cell culture models or macro-scale models that do not properly represent the physiological sizes, structures, and environmental conditions of human blood vessels. Within this dissertation, the design, fabrication, characterization, and application of a microfluidic impedance platform is presented for the in …
Evaluating The Impacts Of Sleep Disruptions In Women Through Automated Analysis (Sjsl Framework), Shalini Gupta
Evaluating The Impacts Of Sleep Disruptions In Women Through Automated Analysis (Sjsl Framework), Shalini Gupta
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
The proposed research suggests a solution for female sleep disruption by using automated analytics and attempts to improve our understanding of sleep disruption physiology. Although, sleep disruption monitoring is gaining attention with the use of sleep monitoring devices that track sleep disruptions. Automated technology can capture repeated measurements, evaluate sleep patterns, and make suggestions. However, facts revealed by clinical research suggest that it can measure sleep – disruption records, and sleep disorders. Moreover, this research can be useful for prescribing individual treatment, and hence improve individual healthcare optimization. In fact, some of the health tracking electronic devices assist individuals in …
Evaluating The Impacts Of The Internet Of Things To Reduce Runway Incursions: Understanding The Why, How, And When, Samuel Inanore Okate
Evaluating The Impacts Of The Internet Of Things To Reduce Runway Incursions: Understanding The Why, How, And When, Samuel Inanore Okate
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
The Federal Aviation Administration’s (FAA) mission is to maintain the safest and most efficient aerospace system in the world. The FAA has stated that runway safety is one of their top priorities, which encapsulates pilots, air traffic controllers, and airport vehicle drivers and workers (Federal Aviation Administration, June 2015). Federal Aviation Administration categorizes a runway incursion as a hazardous event that can occur in the Air Operations Area (AOA) that involves an incorrect presence of an aircraft, vehicle or person in the protected area of a surface designated for the landing and takeoff of an aircraft (Federal Aviation Administration, June …
Fundamental Principles Of Tremor Propagation In The Upper Limb, Andrew Doran Davidson
Fundamental Principles Of Tremor Propagation In The Upper Limb, Andrew Doran Davidson
Theses and Dissertations
Although tremor is the most common movement disorder, there exist few effective tremor-suppressing devices, in part because the characteristics of tremor throughout the upper limb are unknown. To clarify, optimally suppressing tremor requires a knowledge of the mechanical origin, propagation, and distribution of tremor throughout the upper limb. Here we present the first systematic investigation of how tremor propagates between the shoulder, elbow, forearm, and wrist. We simulated tremor propagation using a linear, time-invariant, lumped-parameter musculoskeletal model relating joint torques and the resulting joint displacements. The model focused on the seven main degrees of freedom (DOF) from the shoulder to …
Mux/Demux Of Hevc/H.265 Video Stream With He-Aac V2 Audio Bit Stream And To Achieve Lip Synch, Deepika Pagala
Mux/Demux Of Hevc/H.265 Video Stream With He-Aac V2 Audio Bit Stream And To Achieve Lip Synch, Deepika Pagala
Electrical Engineering Theses - Archive
The increasing demand for video and the increase in the number of devices enable of supporting digital media facilitate the enormous demand for video streaming over internet and and Internet Protocol Television (IPTV) applications. The high bit rates that result from the various types of digital video make their transmission through their intended channels very difficult. Hence it becomes necessary to select a good compression scheme to overcome storage and transportation problems of the digital video. High Efficiency Video Coding (HEVC) is an international standard for video compression developed by a working group of ISO/IEC MPEG (Moving Picture Experts Group) …