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Articles 1801 - 1830 of 3180
Full-Text Articles in Engineering
Computational Analysis Of A Multistage Axial Compressor, Chaithanya Mamidoju
Computational Analysis Of A Multistage Axial Compressor, Chaithanya Mamidoju
Mechanical and Aerospace Engineering Theses - Archive
Turbo machines are used extensively in Aerospace, Power Generation, and Oil & Gas Industries. Efficiency of these machines is often an important factor and has led to the continuous effort to improve the design to achieve better efficiency. The axial flow compressor is a major component in a gas turbine with the turbine's overall performance depending strongly on compressor performance. Traditional analysis of axial compressors involves throughflow calculations, isolated blade passage analysis, Quasi-3D blade-to-blade analysis, single-stage (rotor-stator) analysis, and multi-stage analysis involving larger design cycles. In the current study, the detailed flow through a 15 stage axial compressor is analyzed …
Reduced Order Modeling Of Low-Temperature Gas Discharges In Glow Mode, Esteban Cisneros
Reduced Order Modeling Of Low-Temperature Gas Discharges In Glow Mode, Esteban Cisneros
Mechanical and Aerospace Engineering Theses - Archive
Gas discharge actuation of fluid dynamics phenomena has garnered significantattention in recent years due to their low-power requirements andtheir geometrical simplicity, amongst others. However, many of their actuationmechanisms and physical couplings are still not well-understood,calling for numerical efforts to address many of theseproblems. Modeling and simulation of plasma-flow interaction is anexhaustive task because of the multi-physics, multi-scale nature ofthe problem. One particular concern is the appropriate modeling of thedischarge detailed chemistry in order to reduce the computationalcost associated with it while capturing all of its finest features. \\Modern reduction techniques attempt to create reduced-order models ofchemical kinetics by identifying low-dimensional …
Development Of A Conceptual Design Weight Estimation Method Library And Documentation, Andrew S. Walker
Development Of A Conceptual Design Weight Estimation Method Library And Documentation, Andrew S. Walker
Mechanical and Aerospace Engineering Theses - Archive
The state of the art in estimating the volumetric size and mass of flight vehicles is held today by an elite group of engineers in the Aerospace Conceptual Design Industry. This is not a skill readily accessible or taught in academia. To estimate flight vehicle mass properties, many aerospace engineering students are encouraged to read the latest design textbooks, learn how to use a few basic statistical equations, and plunge into the details of parametric mass properties analysis. Specifications for and a prototype of a standardized engineering "tool-box" of conceptual and preliminary design weight estimation methods were developed to manage …
Plasmonic Nanostructures For Surface-Enhanced Raman Spectroscopy, Ruiqian Jiang
Plasmonic Nanostructures For Surface-Enhanced Raman Spectroscopy, Ruiqian Jiang
Material Science and Engineering Theses - Archive
In the last three decades, a large number of different plasmonic nanostructures have attracted much attention due to their unique optical properties. Those plasmonic nanostructures include nanoparticles, nanoholes and metal nanovoids. They have been widely utilized in optical devices and sensors.When the plasmonic nanostructures interact with the electromagnetic wave and their surface plasmon frequency match with the light frequency, the electrons in plasmonic nanostructures will resonate with the same oscillation as incident light. In this case, the plasmonic nanostructures can absorb light and enhance the light scattering. Therefore, the plasmonic nanostructures can be used as substrate for surface-enhanced Raman spectroscopy …
Dynamic Simulation Of Multibody Systems In Simultaneous, Indeterminate Contact And Impact With Friction, Adrian Rodriguez
Dynamic Simulation Of Multibody Systems In Simultaneous, Indeterminate Contact And Impact With Friction, Adrian Rodriguez
Mechanical and Aerospace Engineering Dissertations - Archive
This research is focused on improving the solutions obtained using theory in contact and impact modeling. A theoretical framework is developed which can simulate the performance of dynamic systems within a real world environment. This environment involves conditions, such as contact, impact and friction. Numerical simulation provides an easy way to perform numerous iterations with varying conditions, which is more cost effective than building equivalent experimental setups. The developed framework will serve as a tool for engineers and scientists to gain some insight on predicting how a system may behave. The current field of research in multibody system dynamics lacks …
Design And Fabrication Of Microfluidic Photoelectrochemical Reactors For Efficient Conversion Of Carbon Dioxide To Liquid Fuel, Homayon Homayoni
Design And Fabrication Of Microfluidic Photoelectrochemical Reactors For Efficient Conversion Of Carbon Dioxide To Liquid Fuel, Homayon Homayoni
Mechanical and Aerospace Engineering Dissertations - Archive
The world's energy demand is expected to increase dramatically over the next few decades. At the same time the availability of cheap fossil fuels is expected to decrease. In addition to the increase in energy cost, the use of fossil fuels results in the release of greenhouse gases into the atmosphere. A lot research effort has been invested in the development of renewable energy resources that are cost competitive, sustainable, and emission free. Although these renewable technologies are available, many are not implemented widely due low efficiency and high capital cost. Therefore, fossil fuels are expected to remain a major …
Enhancement Of Pool Boiling And Evaporative Heat Transfer Using High Temperature Thermally Conductive Microporous Coatings, Ajay Gurung
Mechanical and Aerospace Engineering Dissertations - Archive
The present research is an experimental study of the enhancement of pool boiling and evaporative heat transfer using high temperature thermally conductive microporous coatings. Two major types of coatings were investigated: one that is based on copper powders on copper substrate and the other on aluminum powders on aluminum substrate. Both coatings were easy to fabricate with low costs compared to conventional sintering and plasma spraying techniques, yet have high bonding strength and some of them can operate at temperatures up to 670 oC. Multiple coating options were fabricated and tested in pool boiling of water in order to optimize …
Experimental Study Of Separated Ramp-Induced Shock/Boundary-Layer Interaction With Upstream Micro-Vortex Generator At Mach 2.5, Yusi Shih
Mechanical and Aerospace Engineering Dissertations - Archive
Shock wave/boundary layer interactions (SBLIs) are important issues for high-speed vehicles. SBLIs reduce the performance of aerodynamic surfaces and engine inlets, amongst a number of adverse effects. Micro-vortex generators (MVGs) are a flow control method with strong potential to mitigate the effects of SBLI by energizing the boundary layer through momentum transfers from the freestream. They have been implemented in actual configurations at low speeds. The present research includes a combined experimental and theoretical analysis of the evolution of the perturbation downstream the MVG, the formation of vortices, and their interaction with the shock front. Experiments were performed with a …
Analytical Solutions Of Steady-State Heat Conduction In Multi-Layer Stack Packaging, Saeed Ghalambor
Analytical Solutions Of Steady-State Heat Conduction In Multi-Layer Stack Packaging, Saeed Ghalambor
Mechanical and Aerospace Engineering Dissertations - Archive
Analytical models that can be utilized in modeling the steady-state temperature solutions of planar and 3D packaged integrated circuits are discussed. This mathematically-driven model will include solutions for uniform and non-uniform footprint die stack systems as well as planar flip chip packages. These analytically obtained temperature solutions will include the contribution of thermal resistance for both cases as well as perfect contact scenarios. The acquired solution will accommodate any kind of boundary conditions (first, second and third kind) on the top and bottom surfaces of the stack system with the sides being adiabatic. Furthermore, the algorithm developed will consider volumetric …
Computational Analysis Of Nanostructures Formed In Molten Salt Nanofluids, Vidula B. Pawar
Computational Analysis Of Nanostructures Formed In Molten Salt Nanofluids, Vidula B. Pawar
Mechanical and Aerospace Engineering Theses - Archive
Meeting the continuously increasing demand of `clean' energy is the biggest challenge of the energy research field. Amongst the many renewable sources of energy, energy from the Sun is one of the biggest sources in the form of light and heat. Photovoltaic cells and concentrated solar power are few of the solar energy harnessing technologies. Photovoltaic cells use semiconductor materials to directly convert energy from sun into electricity. CSP uses a combination of solar receivers (mirrors or lenses) to concentrate the solar thermal energy which is further converted into electricity using the common thermodynamic cycle. One of the Photovoltaic (PV) …
A Refined Approach To Identifying And Quantifying Clay And Non -Clay Minerals In Expansive Soils, Spoorthi Reballi
A Refined Approach To Identifying And Quantifying Clay And Non -Clay Minerals In Expansive Soils, Spoorthi Reballi
Civil Engineering Theses - Archive
Expansive soils exhibit substantial swelling and shrinkage due to moisture fluctuations. Predicting this volume change behavior of expansive soils has been a major challenge to the engineers in the past few years. One of the factors which play a vital role in understanding the behavior of the expansive soils is mineralogy. Chittoori (2008) had developed three models to quantify the clay minerals using Microsoft Excel Solver, Regression Equations and Artificial Neural networks. The major assumption is that the soil has only three mineral Montmorillonite, Kaolinite and Illite. But the amorphous contents like quartz and feldspar were not taken in to …
Comparison Of Prestressed Concrete Girders With Debonded Strands And Harped Strands, Carmen Diaz-Caneja Nieto
Comparison Of Prestressed Concrete Girders With Debonded Strands And Harped Strands, Carmen Diaz-Caneja Nieto
Civil Engineering Theses - Archive
TxDOT standards follow a design that uses depressed strands for the prestressed concrete I-Girders. A new design criteria using debonded strands for prestressed concrete girders that is widely used in Europe is being introduced in Texas. This new design has been proven to be effective and faster to construct since the strands don't need to be harped. The Lyndon B. Johnson (LBJ) Express construction project was located on I-35 and I-635 in North Dallas Texas and required placement of approximately 7,000 girders to complete this extensive project. A typical girder utilized in this project is the Tx54 with a span …
The Impact Of Lime Dosage On Odor Reduction Of Biosolids, Arash Abri
The Impact Of Lime Dosage On Odor Reduction Of Biosolids, Arash Abri
Civil Engineering Theses - Archive
The amount of boisolids production is increasing due to developing cities and the mitigation of biosolids odorants is a key role to have a successful biosolids land application program. The objective of this study is to investigate the effect of lime stabilization on odor reduction of bio-solids and determine the optimum percentage of lime for each major odor compound and the overall target lime dose in terms of priority and importance of odorants. the Village Creek Water Reclamation Facility (VCWRF) was chosen to supply limed dewatered solids because of having complaints about the odor of biosolids in neighborhood. 5%, 10%, …
Group Resistance Of Recycled Plastic Pin In Sustainable Slope Stabilization, Mohammad Rezaul Haque Bhuiyan
Group Resistance Of Recycled Plastic Pin In Sustainable Slope Stabilization, Mohammad Rezaul Haque Bhuiyan
Civil Engineering Theses - Archive
Slope failure is a common phenomenon in areas with slope constructed on high plasticity clay and shallow slope failure is predominant in North Texas. The cumulative maintenance cost of minor slides is equal or greater than major landslides. But, cost associated with post failure maintenance can be reduced significantly if an appropriate stabilization method is adopted. Thus, selection of appropriate and economically viable slope stabilization method has got great importance for the geotechnical engineers. Recently, a new approach of shallow slope stabilization technique is introduced using Recycled Plastic Pin (RPP). RPP used in shallow slope stabilization should pass beyond the …
Role Of Coarse Soil Fraction On Resilient Moduli Properties Of Clayey Soil, Chatuphat Savigamin
Role Of Coarse Soil Fraction On Resilient Moduli Properties Of Clayey Soil, Chatuphat Savigamin
Civil Engineering Theses - Archive
As one of the major methods of soil stabilization used in the present, mechanical stabilization improves a native soil by admixing a coarse and/or fine material. This method of soil stabilization aims to reach a composition in which coarser particles form the skeleton and the surrounding space is filled with fine grains. As a result, higher soil strength can be achieved. To study the soil strength improvement behavior, resilient modulus and unconfined compressive strength are used as evaluation parameters in this research. Since the present research focuses on subgrade soils, Dallas clay was selected as a reference clayey soil representing …
Comparison Of The Installation Of Strand With Steel Bar Tendons In Anchored Drilled Shaft Wall, Inigo Azofra Arrizabalaga
Comparison Of The Installation Of Strand With Steel Bar Tendons In Anchored Drilled Shaft Wall, Inigo Azofra Arrizabalaga
Civil Engineering Theses - Archive
Anchored drilled shaft walls are common in construction nowadays in the U.S. The use of either strand tendons or steel bar tendons as anchors in construction is approved. However, there is no information from a construction standpoint, of what type of tendon fits better depending on the field conditions or the project requirements. Nor is there any study reflecting the construction process and sequence of this type of retaining wall depending on the type of tendon. This research will evaluate different consequences of the selection of the type of tendon. It will analyze the design aspects, construction scheduling, construction costs, …
Condition Assessment Of Fiber Reinforced Polymer Strengthening Of Bridge Components, Hemachand Pallempati
Condition Assessment Of Fiber Reinforced Polymer Strengthening Of Bridge Components, Hemachand Pallempati
Civil Engineering Theses - Archive
Fiber Reinforced Polymers (FRP) is a newly developed composite type of material which have many advantages over conventional materials (concrete and steel) like light weight, non-corrosive nature, design flexibility and quick installation. Due to its superior thermo-mechanical properties, it has emerged as one of the best economical method to strengthen and repair reinforced concrete bridges that were damaged each year due to various reasons like structural deterioration over time, fire accidents, corrosion of steel reinforcement and over height vehicle collision. This research aims to evaluate the long term performance of FRP strengthened bridge components with the help of Pull-Off tests. …
Decreased Expression Of Microtubules In Confined Microenvironments Leads To A Reduced Effect Of Paclitaxel On Breast Cancer Cells, Bailey Sayles
Decreased Expression Of Microtubules In Confined Microenvironments Leads To A Reduced Effect Of Paclitaxel On Breast Cancer Cells, Bailey Sayles
Bioengineering Theses - Archive
Despite the current medical options available to patients, cancer cells frequently remain after treatment and metastasize. This is particularly significant because secondary cancers account for 90% of cancer-related fatalities. Using standard lithography techniques to make PDMS-based microchannel devices, different microenvironments for studying metastasizing (MDA-MB-231) and non-metastasizing (MCF-7) breast cancer cells were created. While the cells were in the narrow and wide microchannels, effects of the anti-cancer drug Paclitaxel at different concentrations were examined and compared with the traditional Transwell assay. Paclitaxel stabilizes microtubules inside the cell and restricts replication, making it an ideal drug to target for quickly dividing cancer …
Development Of A Database And Selection Model For Optimum Retaining Wall Construction, Cost And Production, Fernando Pizarro Quintanar
Development Of A Database And Selection Model For Optimum Retaining Wall Construction, Cost And Production, Fernando Pizarro Quintanar
Civil Engineering Theses - Archive
Retaining walls are earth retention elements that result essential in the majority of the construction projects for the overall project performance, as well as its budget and schedule. These elements constitute a key role in urban development, industrial facilities and civil projects as evidenced by the more than 170 million of square feet being constructed per year in the United States. The current market conditions, as well as the advances in the technology and knowledge associated to these elements, determine the need for accurate decision making processes that lead to optimum retaining walls in terms of applicability, cost and production …
Adsorption Of Metals In Flu-Gas Desulfurization Wastewater By Iron-Impergnated Activated Carbon, Manjira Kudaravalli
Adsorption Of Metals In Flu-Gas Desulfurization Wastewater By Iron-Impergnated Activated Carbon, Manjira Kudaravalli
Civil Engineering Theses - Archive
The combustion of coal releases flue gases into the atmosphere. The flue gas has very high concentrations of Sox. Flue gas desulfurization technologies are installed in almost all the coal fired power plants to treat the flue gas and to reduce the sulfur dioxide emissions. Sulfur dioxide emissions cause serious impacts on environment and also the human health. Studies on the FGD technologies reveal that, wet FGD technology is used more extensively to treat the Flue gas, as it cost efficient and also the reduction efficiencies are very high. Despite the treatment process available for treating the FGD wastewater, achieving …
A Glm/Ica Analysis Using Motion Tracking And Electromyography Differentiates Between Brain Activation Due To Intended And Unintended Motions In Fnirs Images Acquired During A Finger Tapping Task Performed By Children With Cerebral Palsy, Nathan Hervey
Bioengineering Theses - Archive
Functional neurological imaging has been shown to be valuable in evaluating brain plasticity in children with cerebral palsy (CP). In recent studies it has been demonstrated that functional near-infrared spectroscopy (fNIRS) is a viable and sensitive method for imaging motor cortex activities in children with CP. However, during unilateral finger tapping tasks children with CP often exhibit mirror motions (unintended motions in the non-tapping hand), and current fNIRS image formation techniques do not account for these motions. Therefore, the resulting fNIRS images contain activation from both intended and unintended motions. In this study, cortical activity was mapped with fNIRS on …
Peripheral Nerve Injuries: Pleiotrophin-Mediated Regeneration Across Long-Gap Injuries And Investigations Into Amputation Neuroma Pain, Benjamin Johnston
Peripheral Nerve Injuries: Pleiotrophin-Mediated Regeneration Across Long-Gap Injuries And Investigations Into Amputation Neuroma Pain, Benjamin Johnston
Bioengineering Dissertations - Archive
Peripheral nerve injuries can be a chronic clinical challenge for patients. Long recovery periods, functional deficits, and neuropathic pain all complicate healing. Although peripheral nerves are able to regenerate, most gap nerve injuries are repaired by autograft, which induces a secondary injury and provides suboptimal recovery of function. This work provides insights into the use of Pleiotrophin (PTN) to bridge long-gap injures and assess the functional recovery of the common peroneal nerve (CPN) injury model. In addition to regeneration strategies, a painful neuroma-blocking conduit was developed to help patients with amputation neuromas. Lastly, this work addresses the unusual phenomenon of …
Methodological Advances And Application Of Functional Near-Infrared Spectroscopy To Guide Cortical Stimulation For Physical Recovery In Patients With Brain Injury, Bilal Khan
Bioengineering Dissertations - Archive
Non-invasive cortical stimulation used in conjunction with physical therapy can enhance the motor performance of persons with brain injury. Transcranial direct current stimulation (tDCS) is a non-invasive cortical stimulation technique that modulates cortical activation by delivering weak current through a pair of anodal-cathodal (excitation-suppression) electrodes, placed on the scalp over the targeted cortical centers. Recently, application of tDCS over the sensorimotor cortex of stroke patients in conjunction with physical therapy has been shown to induce beneficial plasticity in the injured brain resulting in improved motor performance. However, in all currently reported tDCS-based interventions the locations of electrode pairs used to …
Effects Of Corn Mill Waste On Municipal Solid Waste Degradation In Bioreactor Landfills, Dipta Mitra Joy
Effects Of Corn Mill Waste On Municipal Solid Waste Degradation In Bioreactor Landfills, Dipta Mitra Joy
Civil Engineering Theses - Archive
The Enhanced Leachate Recirculation (ELR) landfills is a sustainable disposal system of waste which facilitates faster degradation of waste, more gas generation in a short period of time, rapid waste stabilization along with energy recovery. The decomposition of waste largely depends on heterogeneity of landfilled waste composition, leachate recirculation, rainfall, and several other factors like recirculate leachate composition, ambient temperature etc. Various researches have been conducted on landfill behavior subjected to various waste composition and conditions.Corn Mill Waste, a crop residue and a refuse from corn milling industries, is a major source of crop waste in US. A significant amount …
Settlement Analysis Of Drilled Shaft Foundation On Natural And Lime-Treated Compressible Clayey Soil, Abdusemed Kemal Ali
Settlement Analysis Of Drilled Shaft Foundation On Natural And Lime-Treated Compressible Clayey Soil, Abdusemed Kemal Ali
Civil Engineering Theses - Archive
Drilled shaft foundations are primarily used to support structures such as bridge piers, buildings, and transmission towers. The main advantage of a drilled shaft foundation is that it transfers loads to the stronger subsoil layers or rock strata lying underneath, giving maximum bearing capacity to the overlying structure.This goal of this research is to load bearing capacity of a drilled shaft on both treated and untreated compressible soil. In this study, both analytical and numerical studies were conducted to investigate the effect of lime treatment on the settlement of the drilled shaft. Extensive literature study was conducted on analysis of …
Variability Of As-Constructed Properties Of Hma And Their Relation To Pay Factors And Rutting Resistance: A Case Study, Rosario Tripiana Martinez
Variability Of As-Constructed Properties Of Hma And Their Relation To Pay Factors And Rutting Resistance: A Case Study, Rosario Tripiana Martinez
Civil Engineering Theses - Archive
During the last decade, Texas has under gone a huge reconstruction of its major and strategic highways in order to improve transportation and prepare for future population and traffic growth. The population is estimated to increase by 50% for 2035 for the North Texas Area.Some of those highway reconstruction projects have asphalt pavements, and they utilize significant quantities of asphalt concrete. This study compiles the test results of As-Constructed properties for asphalt mixes for four different projects built in Texas. This data was statistically analyzed to obtain information on the variability of As-Constructed properties and study the effect of the …
Polymeric Nano/ Microparticles For Management Of Pulmonary Diseases, Jyothi Unnikrishna Menon
Polymeric Nano/ Microparticles For Management Of Pulmonary Diseases, Jyothi Unnikrishna Menon
Bioengineering Dissertations - Archive
Drug delivery via pulmonary route has emerged as an attractive area of study in the past two decades. This method of administration has multiple advantages for both systemic and local drug delivery due to the availability of a large surface area for drug absorption and higher solute permeability in the lung. Most importantly, inhalational drug delivery provides direct accessibility to the lung via a noninvasive route of administration. Recent literature has shown a surge in the use of nano/micro particles for a wide range of pulmonary applications ranging from targeted and controlled drug delivery to drug screening and tissue regeneration. …
Establishing The Method Of Dual-Tensor For Tract Based Analysis (Dtta) And Investigating Human Brain Developmental Connectome With Diffusion Mri, Virendra Radheshyam Mishra
Establishing The Method Of Dual-Tensor For Tract Based Analysis (Dtta) And Investigating Human Brain Developmental Connectome With Diffusion Mri, Virendra Radheshyam Mishra
Bioengineering Dissertations - Archive
Diffusion MRI (dMRI) has the unique ability of studying white matter fiber structure in the human brain in-vivo. The trajectory of the white matter fibers inside the brain can be mapped using the tractography techniques and their structural integrity can be assessed with the help of various metrics such as fractional anisotropy (FA) derived from diffusion tensor imaging (DTI). But with typical dMRI in clinical applications, almost half of human brain white matter (WM) voxels has crossing-fiber regions (CFR) where WM microstructural integrity is significantly underestimated with single tensor FA. A technique adapted to WM tract analysis and correcting the …
Ultrasound-Modulated Fluorescence Techniques, Yuan Liu
Ultrasound-Modulated Fluorescence Techniques, Yuan Liu
Bioengineering Dissertations - Archive
Ultrasound-modulated fluorescence (UMF) imaging has been proposed as a novel imaging modality by combining ultrasound and optical imaging techniques for early cancer detection. In UMF, a focused ultrasound beam is used to modulate the diffused fluorescence photons in the acoustic focal region, and by specifically analyzing the modulated photons, one can isolate and quantify the fluorescence properties within the ultrasonic focal area. Therefore, UMF is able to provide fluorescence contrast while maintaining ultrasound resolution in tissue. The major challenge of UMF is to extract the weakly modulated fluorescence signal from a bright and unmodulated background, i.e. the low modulation efficiency. …
Evaluation Of The Performance Of Steel Fiber Reinforced Concrete Pipes Produced By Packerhead Method, Abdelaziz Mohsen
Evaluation Of The Performance Of Steel Fiber Reinforced Concrete Pipes Produced By Packerhead Method, Abdelaziz Mohsen
Civil Engineering Theses - Archive
This research aimed at evaluating the use of Dramix RC 65/35 CN steel fiber as an alternative to the conventional reinforcement in concrete pipes. The performance of steel fiber reinforced concrete pipes produced by Packerhead pipe production machine was evaluated through an experimental testing of steel fiber reinforced concrete pipes with diameters from 18 to 36 in and different steel fiber dosages.Three-edge bearing tests were carried out according to the ASTM C497 to determine the strength class of each case of pipes. For more detailed image of the tested pipes' performance, load-deflection data were acquired and plots were made to …