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Articles 1 - 22 of 22
Full-Text Articles in Engineering
Effect Of Rolling On Viscoelastic Fluids Using A Novel Testing Device, Aswini Mangadu
Effect Of Rolling On Viscoelastic Fluids Using A Novel Testing Device, Aswini Mangadu
Dissertations and Theses
The purpose of this research thesis project was to develop a mechanical testing device that could enable us to load articular cartilage with a rolling/sliding motion. This novel device was then used to observe the effect of a rolling motion on the fluid film thickness of different lubricants (motor oil, synovial fluid and Hyaluronic Acid (HA)) to varying loads (1kg, 2,kg, 3kg and 4kg) and speeds (10, 25, 48 and 91 mm/s) applied on the sample fluids for 10 cycles. We were able to examine the effect of different speeds within each load for each of the fluid that was …
Application Of Computational Fluid Dynamics As A Simulation-Based Design Guide In A Microfluidic 3d Living Cell Array (3d Lca) Device, A.H. Rezwanuddin Ahmed
Application Of Computational Fluid Dynamics As A Simulation-Based Design Guide In A Microfluidic 3d Living Cell Array (3d Lca) Device, A.H. Rezwanuddin Ahmed
Dissertations and Theses
The use of computational fluid dynamics (CFD) as a tool in the aerodynamics and oil industry provides a reinforcement to efficiency in the design of aircrafts or for understanding the flow through pipes. A similar approach can be taken towards microfluidics, where traditionally devices have been designed based on experience or physiological replication, and a CFD simulation is shown post-manufacture to show the flow and diffusion patterns present. In this study, a reverse approach is suggested, by designing the device first in CFD and perform simulations on variations of alterable parameters to get insight on how the changing parameters affect …
Image Analysis Of Air-Bubble Injection (Front And Side View) Into A Turbulent Liquid Stream, Navjot Kaur
Image Analysis Of Air-Bubble Injection (Front And Side View) Into A Turbulent Liquid Stream, Navjot Kaur
Dissertations and Theses
"This study concerns an air bubble injection experiments in a vertical upward annular channel in which a 0.4 mm hole was created to inject the air bubbles into the turbulent stream. Water was used as a testing fluid, and the experiments were performed at atmospheric pressure and room temperature. A high-speed video camera was used to capture the dynamics of the bubble formation process. Two different experimental views were used: a front view in which flow velocity was 0.80 m/s (2.68 GPM) at Reynolds number, Re=7413 and to inject air bubbles into water stream air bubble injection rate was set …
Acoustic Emission Study Of Fiber Orientations On Fiber-Metal Laminates Under Monotonic Tensile Loading, Man Fung (Frank) Chow
Acoustic Emission Study Of Fiber Orientations On Fiber-Metal Laminates Under Monotonic Tensile Loading, Man Fung (Frank) Chow
Dissertations and Theses
No abstract provided.
Exploring The Interaction Of Two Self-Excited Energy Harvesters, Yi Han
Exploring The Interaction Of Two Self-Excited Energy Harvesters, Yi Han
Dissertations and Theses
No abstract provided.
The Determination Of Drag And Lift Forces Of A Rigid Beam Located Within A Turbulent Boindary Layer By Means Of Large Eddy Simulation Modeling, Santiago Helman
The Determination Of Drag And Lift Forces Of A Rigid Beam Located Within A Turbulent Boindary Layer By Means Of Large Eddy Simulation Modeling, Santiago Helman
Dissertations and Theses
"Recent studies such as those conducted by Akaydin, Elvin and Andreopoulos in [1] have described and quantified the electrical power that can be extracted from a moving flow by the implementation of energy harvesters. In such study, a flexible cantilevered beam was fitted with a cylindrical prism at the free end and placed within a uniform flow field. Due to the vortex shedding generated by the prism (e.g. Von Karman vortices) the beam was found to oscillate about the undisturbed position. The beam in question was then outfitted with a piezoelectric material in order to translate the transient strain energy …
Transport Pathway Across Hcaecs Uncer Convective Condtitions And The Role Of Apoptosis In Ldl Transport Through Hcaecs, Janpen Phupeerasupong
Transport Pathway Across Hcaecs Uncer Convective Condtitions And The Role Of Apoptosis In Ldl Transport Through Hcaecs, Janpen Phupeerasupong
Dissertations and Theses
No abstract provided.
Drug Treatment Of Kidney Clip-Induced Hypertension In Rats; Peroxidase Tracer Spot Frequency In Rat Aorta After Chemically Induced Apoptosis, Simon Kleinbart
Drug Treatment Of Kidney Clip-Induced Hypertension In Rats; Peroxidase Tracer Spot Frequency In Rat Aorta After Chemically Induced Apoptosis, Simon Kleinbart
Dissertations and Theses
No abstract provided.
Photocrosslinked Methylcellulose Hydrogels For Controlled Protein Release, Das Dritiman
Photocrosslinked Methylcellulose Hydrogels For Controlled Protein Release, Das Dritiman
Dissertations and Theses
No abstract provided.
Doping Of Metal Organic Framework (Uio) And For N02 Adsorption At Ambient Conditions, Amani M. Ebrahim
Doping Of Metal Organic Framework (Uio) And For N02 Adsorption At Ambient Conditions, Amani M. Ebrahim
Dissertations and Theses
Pollution issues and environmental concerns have led to the development of various air purification technologies. Nitrogen dioxide NO2 is one of the toxic gases in the atmosphere that is corrosive; it causes severe damage to materials, even at low concentrations. Research on the adsorption of this gas at atmospheric pressure and ambient temperatures is uncommon because of limited industrial applications. The thermal stability and microporous nature of Zirconium-based Metal Organic Framework (Zr-MOF) UiO-66 and UiO-67 make them good candidates for metal or amine decoration. The objective of this work was to investigate the effect of metal or amine doping (direct …
Reliability Analysis Of The Hec-18 Scour Equation And Aashto Deep Foundation Design Codes, Jun Yan
Reliability Analysis Of The Hec-18 Scour Equation And Aashto Deep Foundation Design Codes, Jun Yan
Dissertations and Theses
This research project studied the reliability of driven pile foundations subjected to scour, gravity loads including dead loads and live loads, and their combinations. The design of the foundation followed the procedures of the AASHTO LRFD Bridge Design Specification. The design methods were the HEC-18 pier scour equation used to determine the scour depth, and the α-Method and Nordlund-Thurman Method used to design the driven pile. The limit state considered was the axial bearing resistance of the piles in the soil. The reliability indexes for bridges subjected to maximum expected scour depth and gravity loads were found through Monte Carlo …
A Novel Visual Stimulation Paradigm: Exploiting Individual Primary Visual Cortex Geometry To Boost Steady State Visual Evoked Potentials (Ssvep), Marta Isabel Vanegas Arroyave
A Novel Visual Stimulation Paradigm: Exploiting Individual Primary Visual Cortex Geometry To Boost Steady State Visual Evoked Potentials (Ssvep), Marta Isabel Vanegas Arroyave
Dissertations and Theses
The steady-state visual evoked potential (SSVEP) is an electroencephalographic response to flickering stimuli generated in significant part by activity in primary visual cortex (V1). SSVEP signal-to-noise ratio is generally low for stimuli that are located in the visual periphery, at frequencies higher than 20 Hz, or at low contrast. Because of the typical "cruciform" geometry of V1, large stimuli tend to excite neighboring cortical regions of opposite orientation, likely resulting in electric field cancellation. In Study 1, we explored ways to exploit V1 geometry in order to boost scalp SSVEP amplitude via oscillatory summation, by manipulating flicker-phase offsets among angular …
Real-Time Atmospheric Compensation And Surface Temperature Estimates From Satellite Using Neural Networks, Gary Bouton
Real-Time Atmospheric Compensation And Surface Temperature Estimates From Satellite Using Neural Networks, Gary Bouton
Dissertations and Theses
Military satellites are being used to determine potential security threats using accurate high sensitivity measurements from defense satellites. These systems focus much more on sensitivity and Signal/Noise Ratio (SNR) than on multispectral capability. Therefore, these systems are highly vulnerable to thermal absorption and reemission that can affect the thermal signature prior to launch. In particular, there is a need to use additional assets to estimate the atmospheric temperature and water vapor profile so that an estimate of the atmospheric processes can be obtained and a correction developed to improve the thermal detection. In particular, the use of existing meteorological geostationary …
Methane Hydrate Formation Under Different Surfactants, Mohammad Mahmud
Methane Hydrate Formation Under Different Surfactants, Mohammad Mahmud
Dissertations and Theses
No abstract provided.
Application Of Multi-Hazard Seismic-Blast Detailing For Highway Bridges, Dominique Morton Torres
Application Of Multi-Hazard Seismic-Blast Detailing For Highway Bridges, Dominique Morton Torres
Dissertations and Theses
The increase of worldwide terrorist attacks on public transportation has heightened our concerns of protecting the nation’s transportation infrastructure. Highway bridges are an attractive target for terrorist attacks due to ease of accessibility and their overall importance to society. The primary objective of this research is to investigate multi-hazard seismic-blast correlations of blast-induced bridge components through numerical simulations of a high-precision finite element model of a typical highway bridge in New York. Seismic-detailing for blast loading on bridges has been investigated to study the correlations between seismic design for blast load effects. High-precision 3D Finite Element models of bridges detailed …
A Novel Biomaterial Enables Chemotactic Study Of Motile Central Nervous System-Derived Tumor Cells, Tanya Singh
A Novel Biomaterial Enables Chemotactic Study Of Motile Central Nervous System-Derived Tumor Cells, Tanya Singh
Dissertations and Theses
"The local cell microenvironment plays an important role in maintaining the dynamics of the extracellular matrix (ECM) and the cell-ECM relationship. ECM is a complex network of macromolecules with distinct mechanical and biochemical characteristics [1]. The multifaceted interactions that occur between cells and the ECM are crucial to the regulation of processes that maintain homeostasis. These mechanisms are often deregulated during cancer onset and progression, which cause the ECM to become highly disorganized, alter the cell-matrix interactions, and promote increased hypervascularity and metastasis as these components are indicative of cancer progression. Medulloblastoma (MB) is one of the most common, malignant …
A Model Of Transient Heat Transfer In A Packed Bed Of Alumina Particles, Samira Shiri
A Model Of Transient Heat Transfer In A Packed Bed Of Alumina Particles, Samira Shiri
Dissertations and Theses
The present study seeks to develop a robust system-scale heat transfer model for a sensible heat storage system. A novel mechanism to simulate axial dispersion and heat loss from the boundary of the sensible heat system to the environment is introduced. The most challenging topics to develop a robust heat transfer model are related to heat loss term, selecting the more reliable method to calculate heat transfer coefficient between fluid and solid, and investigating the effect of neglecting temperature dependency of materials properties. As the storage heat system has a vertical storage vessel, the dominant heat transfer mechanism from the …
Synthesis Of 4-Azidocoumarins And Their Use In Copper-Catalyzed Azide-Alkyne Cycloaddition Reactions, Anthony J. Netsuri
Synthesis Of 4-Azidocoumarins And Their Use In Copper-Catalyzed Azide-Alkyne Cycloaddition Reactions, Anthony J. Netsuri
Dissertations and Theses
Triazole-containing compounds have shown great biological activity ranging from antiviral, antibacterial, to anticancer, to name a few. Coumarin derivatives have also shown interesting biological activities. The combination of these bioactive compounds appears to have great promise for new and future medicines. In this work, various 4-azido-coumarins were synthesized via the transformation of the 4-hydroxy derivatives to 4-benzotriazolyloxy coumarins by reaction with the peptide coupling agent (benzotriazol-1-yloxy)tris-(dimethylamino)phosphonium hexafluorophosphate (BOP), and 1,8-diazabicycloundec-7-ene (DBU) as the base, in tetrahydrofuran (THF) solvent. The 4-benzotriazolyloxy coumarins were converted to the 4-azidocoumarins by reaction with sodium azide (NaN3), and the overall process was simplified to a …
Design, Product Development And Risk Assessment Of Tin (Sn) Ring Electrodes As A Substitute To Silver-Silver Chloride (Ag Agci) Ring Electrodes For High Definition Transcranial Direct Current Stimulation (Hd-Tdcs), Linford Leitch
Dissertations and Theses
The objective of this research thesis is to test the viability of Tin (Sn) ring electrodes as an inexpensive alternative to sintered Silver-Silver Chloride (Ag|AgCl) ring electrodes for High Definition – transcranial Direct Current Stimulation (HD-tDCS). Throughout our initial bench top testing of tin electrodes in combination with a ‘conductive electrode gel’, the passing of a 2mA direct current on agar block showed the formation of white cloud around the anode electrode and a cluster of air bubbles on the cathode. The analysis of pertinent literature indicates that the white milky substance produced during the stimulation at the anode is …
Design, Implementation, And Performance Study Of An Open Source Eye-Control System To Pilot A Parrot Ar.Drone Quadrocopter, John M. Ettikkalayil
Design, Implementation, And Performance Study Of An Open Source Eye-Control System To Pilot A Parrot Ar.Drone Quadrocopter, John M. Ettikkalayil
Dissertations and Theses
Natural user interface is a fairly new concept in the field of human-computer interaction. It is the idea of using every day natural human behaviors and actions to control a device. An example of a natural user interface is touch control technology in smartphones, tablets, and new laptops. The interaction is more direct when compared to artificial input devices like a keyboard and mouse. Though natural user interface devices might not perform as well as standard input devices for certain applications, for other applications they are now the de facto standard. A new user interface that is poised to be …
Assessing Performance Of Ncep Rapid Refresh Model To Predict Boundary Layer Properties, David Daniel
Assessing Performance Of Ncep Rapid Refresh Model To Predict Boundary Layer Properties, David Daniel
Dissertations and Theses
There is a need to be able to estimate the relative humidity in the Planetary Boundary Layer (PBL) since relative humidity can affect aerosol retrieval. Satellite retrievals of Relative Humidity are extremely complicated since they need to resolve 1km vertical resolution for temperature and water vapor. The AIRS hyperspectral sensor may be able to retrieve relative humidity with 20% RMSE but low correlations with R2 – 0.4. The alternative is to explore meteorological forecasts (i.e. Rapid Refresh) to see if we can use them in the processing stream for aerosols. While the state of delay zero is assimilated, the …
Finite Element Study Of Transcranial Direct Current Stimulation: Customization Of Models And Montages, Dennis Q. Truong
Finite Element Study Of Transcranial Direct Current Stimulation: Customization Of Models And Montages, Dennis Q. Truong
Dissertations and Theses
Transcranial Direct Current Stimulation (tDCS) is a non-invasive neuromodulation technique that applies low amplitude current via electrodes placed on the scalp. Rather than directly eliciting a neuronal response, tDCS is believed to modulate excitability – encouraging or suppressing activity in regions of the brain depending on the polarity of stimulation. The particular application of tDCS is often determined by the electrode configuration and intensity of stimulation. MRI-derived finite element models have been developed to analyze the effect of these parameters allowing novel electrode configurations to be tested in subject specific models. By creating a subject specific model of an obese …