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Articles 2041 - 2070 of 2904
Full-Text Articles in Engineering
Comparison Of Brain Activity In The Prefrontal Cortex During Digit Span Task Between Student Veterans With Post Traumatic Stress Disorder And Controls Using Functional Near Infrared Spectroscopy, Bejoy Mathai
Bioengineering Theses - Archive
Near Infrared Spectroscopy (NIRS) is an optical non-invasive imaging technique which makes use of infrared light at particular wavelengths to measure the changes in concentrations of oxygenated blood haemoglobin (HbO) as well as the deoxygenated blood haemoglobin (HbR). Making use of this technique to acquire measurements during different functional activities subcategorises it into the novel and fast developing field of Functional Near Infrared Spectroscopy (fNIRS). In my study I have made use of this novel imaging technique to study the pre-frontal cortex while the subject performs the functional task of digit span task consisting of the forward digit span and …
Flexural Behavior Of Steel Fiber Reinforced Prestressed Concrete Beams And Double Punch Test For Fiber Reinforced Concrete, Netra Bahadur Karki
Flexural Behavior Of Steel Fiber Reinforced Prestressed Concrete Beams And Double Punch Test For Fiber Reinforced Concrete, Netra Bahadur Karki
Civil Engineering Dissertations - Archive
Steel fibers have widely been used in the past to reinforce brittle materials in many nonstructural applications such as pavement, tunneling lining, etc. On the basis of numerous previous studies, ACI 318-11 [2011] has recently accepted steel fiber as a minimum shear reinforcement replacement with minimum 0.75% volume fraction for both reinforced concrete and prestressed concrete members. However, not much previous research has talked about the flexural behavior of fiber reinforced concrete (FRC). As per ACI 318-11 for tension-controlled sections, the net tensile strains in the outermost layer of steel, εt, should be greater than or equal to 0.005 and …
Evaluation Of Training Needs For Building Information Modeling (Bim), German Pena
Evaluation Of Training Needs For Building Information Modeling (Bim), German Pena
Civil Engineering Theses - Archive
The basic premise of Building Information Modeling (BIM) is to use and share the digital model of a project as a source of information for all participants, in order to simulate and analyze potential problems during the project's life-cycle, from conception to operation. BIM is a relatively new technology praised by all participants in the Architecture-Engineering-Construction (AEC) industry for its innovative tools, and the promise of a high return of investment and productivity increase. The construction industry experimented little growth in productivity in the last decades, and is heavily relying on technology rather than intense labor in order to boost …
Effect Of Pavement Type On Fuel Consumption In City Driving, Palinee Sumitsawan
Effect Of Pavement Type On Fuel Consumption In City Driving, Palinee Sumitsawan
Civil Engineering Dissertations - Archive
Vehicular fuel consumption and emissions are two increasingly important measures of effectiveness of sustainable transportation systems, particularly considering that mobile sources in the U.S. account for the largest consumption of energy and generation of air pollution. Improving the energy efficiency of the transportation sector including improving vehicle shape, weight, engine size, and tire quality could play a vital role in reducing fuel consumption and exhaust gas emissions. Pavement surface type and other surface characteristics such as skid resistance and roughness affect vehicular fuel consumption. The main objective of this study has been to investigate any differences that might exist in …
Development Of A Model Of Productivity For Horizontal Directional Drilling (Hdd), Mohmd Sarireh
Development Of A Model Of Productivity For Horizontal Directional Drilling (Hdd), Mohmd Sarireh
Civil Engineering Dissertations - Archive
Horizontal Directional Drilling (HDD) is a growing method for installation of pipes in urban areas and where ever trenching is impossible or undesirable; such as in crossing rivers, lakes, and railways, and special areas such as airports. This technique utilizes downhole cutting heads to create a pilot borehole before it is enlarged with back reamers to allow pulling back of a product pipe. The utilization of HDD for the installation of underground infrastructure (i.e., water, oil and gas pipes, telecommunication, power conduits, in some cases gravity pipes, and so on), has shown a rapid growth compared to other trenchless technologies. …
Impact Of Transit-Oriented Infrastructure Investments On Property Valuations, Francis Amodu Smith
Impact Of Transit-Oriented Infrastructure Investments On Property Valuations, Francis Amodu Smith
Civil Engineering Dissertations - Archive
The population explosion of the second half of the last century brought about increased human activity. Much of the attendant increased access to activities has been facilitated by the incredible technological advances in the automobile, which depends almost entirely on fossil fuels. Supplies of fossil fuel are limited and the automobile has led to urban sprawl, traffic congestion, and reduced quality to life in cities (1). This type of development is unsustainable. Transit-oriented development (TOD) is one of the neo-urbanism response instruments. The question is: "How well do these urban forms perform in North-Central Texas? In response, this study has …
Nano-Modified Cement Composites And Its Applicability As Concrete Repair Material, Tanvir Manzur
Nano-Modified Cement Composites And Its Applicability As Concrete Repair Material, Tanvir Manzur
Civil Engineering Dissertations - Archive
Nanotechnology or Nano-science, considered the forth industrial revolution, has received considerable attention in the past decade. The physical properties of a nano-scaled material are entirely different than that of bulk materials. With the emerging nanotechnology, one can build material block atom by atom. Therefore, through nanotechnology it is possible to enhance and control the physical properties of materials to a great extent. Composites such as concrete materials have very high strength and Young's modulus but relatively low toughness and ductility due to their covalent bonding between atoms and lacking of slip systems in the crystal structures. However, the strength and …
Multivariate Adaptive Regression Spline Based Framework For Statistically Parsimonious Adaptive Dynamic Programming, Subrat Sahu
Multivariate Adaptive Regression Spline Based Framework For Statistically Parsimonious Adaptive Dynamic Programming, Subrat Sahu
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Central to Dynamic Programming (DP) is the `cost-to-go' or `future value' function, which is obtained via actually solving the Bellman's equation and central to Approximate Dynamic Programming (ADP) is the use of an approximation of the future value function. The exact DP algorithm seeks to compute and store a table consisting of one cost-to-go value for each point in the state space and its usefulness is limited by the curse of dimensionality, which renders the methodology computationally intractable in the face of real life problems with high dimensional state space and in the face of continuous state variables. ADP methodology …
Parametric Analysis Of A Detonation-Type Turbofan, Yashwanth M. Swamy
Parametric Analysis Of A Detonation-Type Turbofan, Yashwanth M. Swamy
Mechanical and Aerospace Engineering Theses - Archive
A new type of turbofan which detonates a fuel-air mixture was theoretically found to perform better than a conventional turbofan. A continuous detonation process is described and considered inside the core of the turbofan. The detonation-type turbofan needs certain modifications to detonate the fuel-air mixture at the core of the turbofan, namely, an annular detonation chamber to achieve continuous detonation. A parametric analysis of the new detonation-type turbofan was developed and used to calculate the performance parameters.
Numerical Study Of Drop Formation From Dripping To Jetting, Allouah Kadjo
Numerical Study Of Drop Formation From Dripping To Jetting, Allouah Kadjo
Mechanical and Aerospace Engineering Theses - Archive
The formation of liquid droplet from a capillary tube has been examined using numerical simulations. The dimensions of the capillary tube and the flow velocity have been varied to observe the regimes of drop formation. There are three main regimes of drop formation, which are the periodic dripping, the dripping faucet and the jetting regimes. The mechanism of drop formation changes from one regime to another and involves different parameters. A particular emphasis has been placed on the velocity limits between the different regimes and the critical role played by instabilities in the generation of satellite drops. The algorithm used …
Numerical Modeling Of A Parallel Plate Electrowetting-On-Dielectric (Ewod) Device, Kevin Tully
Numerical Modeling Of A Parallel Plate Electrowetting-On-Dielectric (Ewod) Device, Kevin Tully
Mechanical and Aerospace Engineering Theses - Archive
Numerical modeling and simulations have been performed in this study that focuses on modeling the fluid dynamics of an Electrowetting-on-Dielectric (EWOD) device. The case to be modeled in the present study is a droplet cutting problem where a droplet is sandwiched between two plates of Teflon and an electrical actuation will cause the droplet to cut or split into two smaller droplets. A finite difference method has been used to solve the Navier-Stokes equations, along with the continuity equation. An algorithm used for tracking the free surface is the Volume of Fluid (VOF) method. Along with using the VOF method …
A Highly Linear Voltage Controlled Oscillator With Low Power Dissipation, Sourabh Sharma
A Highly Linear Voltage Controlled Oscillator With Low Power Dissipation, Sourabh Sharma
Electrical Engineering Theses - Archive
A voltage controlled oscillator using 90 nm CMOS technology has been presented with the extremely low power dissipation of 1.35 mW and provides 1.45 mW (with use of buffers) output AC power. It has highly linear voltage to frequency transformation, with only 4.85% of maximum error this VCO Works in the long range from 5.1 to 9.099 GHz while the controlling voltage varies from 0 to .5 volts, The oscillator is powered by a 1 volt power supply.
Improvement In The Performance Of 3g Wireless Communications Systems Using An Ica Based Signal Processing Block, Winston Dsouza
Improvement In The Performance Of 3g Wireless Communications Systems Using An Ica Based Signal Processing Block, Winston Dsouza
Electrical Engineering Theses - Archive
In this thesis, we have implemented a signal processing block in the receiver of a third generation (3G) cellular system to provide improvement in the quality of service. Each block of the cellular system, including the complete transmitter, channel and the receiver is implemented in Matlab. The multiplexing scheme is implemented using wideband code division multiple access (WCDMA). The signal processing block is based on the concept of independent component analysis (ICA), and a rake receiver is used at the receiver to mitigate inter symbol interference due to the multi-paths. The signal processing block (SPB) is further extended to a …
Microarray Image Denoising Using Complex Gaussian Scale Mixtures Of Complex Wavelets, Lakshmi Srinivasan
Microarray Image Denoising Using Complex Gaussian Scale Mixtures Of Complex Wavelets, Lakshmi Srinivasan
Electrical Engineering Theses - Archive
The scientific world has witnessed an explosion in the development of comprehensive and high-throughput methods for molecular biology experimentation. High density DNA microarray technology, allows researchers to monitor the expression levels of thousands of genes in an organism simultaneously, to characterize geneticdiseases at the molecular level and to direct new treatment for specific cellular aberrations. The microarray analysis is rapidly becoming a standard research tool. But, the images produced by microarray experiments, are not perfect and includes noisysources, that contaminate them during the various stages of its formation. These microarray images need to be denoised to ensure reliable and accurate …
Online Learning Algorithms For Differential Dynamic Games And Optimal Control, Kyriakos G. Vamvoudakis
Online Learning Algorithms For Differential Dynamic Games And Optimal Control, Kyriakos G. Vamvoudakis
Electrical Engineering Dissertations - Archive
Optimal control deals with the problem of finding a control law for a given system that a certain optimality criterion is achieved. It can be derived using Pontryagin's maximum principle (a necessary condition), or by solving the Hamilton-Jacobi-Bellman equation (a sufficient condition). Major drawback of optimal control is that it is offline. Adaptive control involves modifying the control law used by a controller to cope with the facts that the system is unknown or uncertain. Adaptive controllers are not optimal. Adaptive optimal controllers have been proposed by adding optimality criteria to an adaptive controller, or adding adaptive characteristics to an …
Compressive Sensing And Wireless Network Capacity With Performance Analysis, Davis Kirachaiwanich
Compressive Sensing And Wireless Network Capacity With Performance Analysis, Davis Kirachaiwanich
Electrical Engineering Dissertations - Archive
This dissertation contains five reseach topics. In chapter 1, the performances of a noncoherent slow frequency-hopping system with M-ary frequency-shift-keyed modulation (NC-FH/MFSK) under various hostile jamming strategies are studied. Then, the knowledge obtained is used in developping a new "combined-jamming" interference model. The model can be used in analyzing the performance of NC- FH/MFSK networks, where transmissions from each network node can interfere with one another. An example application of the proposed model is the channel assignment in a multiradio FH/MFSK wireless mesh network (MR-FH/MFSK WMN). In chapter 2, the multiradio frequency-hopping wireless mesh networks (MR- WMN) is still being …
Guided-Mode Resonance Devices: Omnidirectional Reflectors, Wideband Absorbers, Sensors And Narrowband Filters, Wenhua Wu
Electrical Engineering Theses - Archive
In this thesis, a series of guided-mode resonance (GMR) devices are developed and optimized in the optical spectral region. Some of these devices are designed by inverse algorithms such as genetic algorithm and particle swarm optimization. One-dimensional subwavelength silicon and germanium gratings providing high omnidirectional reflectivity within specific band are designed respectively for TE and TM polarization. A simple amorphous silicon waveguide grating is proposed to enhance the absorbance for solar cells by 60% comparing with unpatterned structure. Another presented grating absorbs light nearly totally in the ~ 0.3-0.6 ìm wavelength band for all incidence angles independent of polarization, namely …
Heat Transfer In Triangular Ducts With Axial Conduction,Containing Porous Medium, Abhishek Banerjee
Heat Transfer In Triangular Ducts With Axial Conduction,Containing Porous Medium, Abhishek Banerjee
Mechanical and Aerospace Engineering Theses - Archive
The objective of this study is to find a numerical solution for the velocity and temperature field in a duct of triangular cross-section area. A fully saturated porous medium is considered to be present in the duct. The study reports the contribution of axial conduction in heat transfer to flow passing through triangular porous passages. The terms in x-direction are retained in the energy equation due to the presence of axial conduction. Also, because of the geometrical asymmetry, non-orthogonal boundary conditions can exist and thus make the determination of heat transfer more difficult. The problem under consideration uses H2 boundary …
Nonlinear Finite Element Analysis Of Columns, Rajkiran Muppavarapu
Nonlinear Finite Element Analysis Of Columns, Rajkiran Muppavarapu
Mechanical and Aerospace Engineering Theses - Archive
In many engineering applications structural components are considered to be beams or columns subjected to a range of external loads such as dead weight, wind, temperature changes etc.In this work a mathematical model has been developed for a sports lighting tower considering it to be a cantilever beam with large deformation. The concept of non-linear P-Delta analysis is applied to the column. Using this model, a tower analysis tool was developed in MATLAB. Using this tool various design alternatives can be examined to evaluate their suitability to a particular task.A number of example problems from the available literature were solved …
Stable Reference Trajectory Modification For Handling Actuator Failure In Control Systems, Ifeolu Olalekan Ogunleye
Stable Reference Trajectory Modification For Handling Actuator Failure In Control Systems, Ifeolu Olalekan Ogunleye
Mechanical and Aerospace Engineering Theses - Archive
The issue of rapidly reconfiguring the reference trajectory under unanticipated actuator failures in order to regain lost performance or aircraft handling qualities is explored. The failures detected in real-time are compensated for by ensuring the input to the system reflects current system conditions. This thesis will also show that only the general structure of the failed system component is needed to achieve successful failure detection and reference trajectory reconfiguration. This approach allows the nominal control structure to remain unchanged in the presence of change flight and system conditions. Acceptable system performance is recovered by detecting the actuator failures in real-time. …
A Non-Invasive Assessment Of Moisture Content Of Municipal Solid Waste In A Landfill Using Resistivity Imaging, Huda Shihada
A Non-Invasive Assessment Of Moisture Content Of Municipal Solid Waste In A Landfill Using Resistivity Imaging, Huda Shihada
Civil Engineering Dissertations - Archive
A bioreactor landfill is operated to enhance waste decomposition, gas production, and refuse stabilization. The fundamental aspect in the operation of a bioreactor landfill is the controlled addition of water and/or the recirculation of leachate into the landfill's waste mass. Since there is an increasing trend to operate landfills as bioreactor landfills, it is crucial to understand the moisture distribution within the landfill. Monitoring the moisture distribution within a bioreactor landfill is essential not only for the design and operation of leachate recirculation systems, but also to identify sites with non-uniform leachate distribution due to ponding and channeling.In the recent …
Design Of Short Drilled Shaft Foundations In High-Plasticity Clay Under Inclined Loading, Thornchaya Wejrungsikul
Design Of Short Drilled Shaft Foundations In High-Plasticity Clay Under Inclined Loading, Thornchaya Wejrungsikul
Civil Engineering Dissertations - Archive
Drilled shaft foundations are primarily used to support structures such as bridge piers, towers, buildings, transmission towers, and roadway cable barriers. Generally, the main characteristics of drilled shafts are to transfer the loads to the stronger layers in the vertical direction and also their ability to withstand lateral movements from lateral loads. Though the design of shafts are well established with respect to combinations of loads and moments, their behavior under pullout type inclined loading is not well established. The inclined load applied is the combination of lateral and uplift loads at the same time and structures such as ends …
Sustainable Reutilization Of Excavated Trench Material, Rajini Kanth Reddy Karduri
Sustainable Reutilization Of Excavated Trench Material, Rajini Kanth Reddy Karduri
Civil Engineering Theses - Archive
Sustainability is becoming a key factor in most construction projects. In most construction projects, personnel are spending efforts to understand the social, economic and environmental impacts of the various facets of construction projects. Geotechnical engineering can contribute to the sustainability of the project via selecting sustainable materials and construction processes that would to lead several tangible benefits. For example a pipeline generally runs through a long and varying terrain which results in innumerable environmental impacts during a pipeline installation. Therefore, it is necessary for the design engineer and also the owner to estimate these impacts of pipe installation and evaluate …
On The Effects Of The Circular Bolt Pattern On The Behavior Of The Extended End-Plate Connection, Roozbeh Kiamanesh
On The Effects Of The Circular Bolt Pattern On The Behavior Of The Extended End-Plate Connection, Roozbeh Kiamanesh
Civil Engineering Dissertations - Archive
This study is pioneer in introducing the circular bolt pattern configuration in extended end-plate steel connections. Discovering the static and cyclic behavior of such connections is at the forefront of this research study. To accomplish this goal, full-scale experimental testing complemented with three dimensional non-linear finite element analysis were conducted. Due to the similarity between the behavior of T-Stubs under tension, and tension flange of the extended end-plate connection, experimental study was conducted on several T-Stub connections to study the effect of the bolt pattern configuration on the ductility, bolt force distribution, flange deformation, and overall performance of the connection. …
Synthesis And Characterization Of Carbon Magnetic Nanoparticles, Sunilsingh Gusain
Synthesis And Characterization Of Carbon Magnetic Nanoparticles, Sunilsingh Gusain
Material Science and Engineering Theses - Archive
Carbon incorporated iron nanoparticles (Fe-CNPs) were successfully synthesized using ultrasonic cavitation in Benzene. This novel method of carbon nanoparticle (CNP) synthesis is a very cost-effective and versatile as one can easily tune the microstructure and magnetic properties by varying few parameters, for e.g. voltage. The Fe-CNP complexes are produced due to the electric plasma discharge generated between the electrodes in an ultrasonic cavitation field of liquid benzene. The constituent of the CNPs can be easily modified by different choice of electrode materials- iron and graphite. The resultant Fe-CNPs were characterized by high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy to …
Engineered Basal Lamina Equivalent - Fabrication And Biomedical Applications, Deepika Tamuly
Engineered Basal Lamina Equivalent - Fabrication And Biomedical Applications, Deepika Tamuly
Bioengineering Theses - Archive
A novel technique based on the principle of solvent casting is developed to create uniform, ultrathin and stackable films of Collagen I/IV and ECMgel for use as Engineered Basal Lamina Equivalent. The mixture of these two proteins provides key molecular elements (laminin, collagen type IV, entactin and perlecan) in a basal lamina with strong mechanical properties (collagen type I). Rat tail derived collagen solution is mixed with ECMgel, and the solution is cast onto PDMS molds and air dried in a custom built air tunnel. The dried membranes are briefly UV cross-linked, peeled off from the PDMS mold to be …
Implementation Of A Pain Generator Controlled By Pressure And Feasability In Its Applications For Functional Near-Infrared Spectroscopy, Pamela Agwa Tebebi
Implementation Of A Pain Generator Controlled By Pressure And Feasability In Its Applications For Functional Near-Infrared Spectroscopy, Pamela Agwa Tebebi
Bioengineering Theses - Archive
Pain is a sensory and emotional experience as a result of possible or definite tissue damage. The level of pain is subjective to the individual's consciousness of sensory stimuli. Pain stimuli can be noxious (i.e., potentially damaging) or innocuous (i.e., normally not painful). Therefore, pain perception can be based on the degree of the stimuli. Studies have been done using brain imaging modalities to assess pain. Functional Near-infrared spectroscopy (fNIRS) is a noninvasive imaging tool and has been used to study the hemodynamic variations in the brain induced by a variety of activations. This research was a feasibility study to …
Investigation Of Brain Activity In Prefrontal Cortex Under Noxious Pain Stimuli And During Psychological Test Using Functional Near Infrared Spectroscopy, Sabin Khadka
Bioengineering Theses - Archive
Functional Near Infrared Spectroscopy (fNIRS) is a non-invasive functional neuroimaging technique, which measures changes in oxy-hemoglobin (HbO) and deoxy-hemoglobin (HbR) concentrations based on the principle of near infrared spectroscopy. For my thesis, I have utilized fNIRS in the prefrontal regions to study cognitive functions under noxious pain and during a psychological test. The fNIRS signals were acquired from the prefrontal cortex (PFC) in order to investigate the hemodynamic response under noxious pain stimuli. The measurement consisted of two different visits separated by seven to ten days with two different levels of pain intensity. From the observations, PFC shows significant deactivation …
Evaluation Of Spatial Resolution And Localization Accuracy Of Absorbing Heterogenity Embedded In Homogenous And Layered Turbid Media Using Functional Near Infrared Spectroscopy, Niranjana Nandakumar
Evaluation Of Spatial Resolution And Localization Accuracy Of Absorbing Heterogenity Embedded In Homogenous And Layered Turbid Media Using Functional Near Infrared Spectroscopy, Niranjana Nandakumar
Bioengineering Theses - Archive
Functional Near-Infrared Spectroscopy (fNIRS) is a non-invasive widely used technique for imaging the brain activation patterns in the cerebral cortex of neonates and adults. For the fNIRS imaging of these brain activation patterns, it is common to assume the head geometry as a homogenous medium due to the resulting computational simplicity of the image reconstruction problem. In reality the head is not a simple homogenous medium and prior research has been conducted to show that light propagates differently in a spatially heterogeneous model of the head compared to a homogenous one, which alters the sensitivity of NIR light detection on …
A Multimodality Dlp® Imaging System For Clinical Surgery, Michael Lee Mangum
A Multimodality Dlp® Imaging System For Clinical Surgery, Michael Lee Mangum
Bioengineering Theses - Archive
With 1.38 million new cases and 450,000 deaths worldwide due to breast cancer, there is a clear need for safe and complete surgical intervention for the treatment of breast cancer. Imaging solutions have been created and developed to help plastic surgeons during breast reconstructive surgery. However, these solutions were implemented separately depending on their particular modality, which can result in higher costs for hospital and patient use. The digital micromirror device (DMD) developed by Texas Instruments has been shown to exhibit spectral control of light at a digital level, and could theoretically allow for the incorporation of multiple imaging modalities …