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Articles 7141 - 7170 of 8682
Full-Text Articles in Entire DC Network
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 …
Novel Cost Measures For Robust Recognition Of Dynamic Hand Gestures, Ameya Kulkarni
Novel Cost Measures For Robust Recognition Of Dynamic Hand Gestures, Ameya Kulkarni
Electrical Engineering Theses - Archive
Computer vision aided automatic hand gesture recognition system plays a vital role in real world human computer interaction applications such as sign language recognition, game controls, virtual reality, intelligent home appliances and assistive robotics. In such systems, when input with a video sequence, the challenging task is to locate the gesturing hand (spatial segmentation) and determine when the gesture starts and ends (temporal segmentation). In this thesis, we use a framework which at its principal has a dynamic space time warping (DSTW) algorithm to simultaneously localize gesturing hand, to find an optimal alignment in time domain between query-model sequences and …
Distributed Model For Thermal Characterization Of Oxide Isolated Silicon Germanium Heterojunction Bipolar Transistors, Sharath Patil
Distributed Model For Thermal Characterization Of Oxide Isolated Silicon Germanium Heterojunction Bipolar Transistors, Sharath Patil
Electrical Engineering Theses - Archive
Demand for high-speed and cost-effective devices has resulted in the development of smaller, high frequency devices. Since semiconductor devices are getting smaller, self-heating effects have become more important. This is especially true in BJTs/HBTs since the base-emitter voltage and hence collector current are sensitive to temperature variations. Self-heating increases the temperature of the devices and results in variations in the electrical properties of the circuit in which these devices are used. Hence, it is important to accurately characterize the self-heating effects and develop reliable models, so that these effects can be taken into consideration in the simulations during the design …
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 …
Investigations In The Impact Of Visual Cognition And Spatial Ability Of Student Comprehension Of Physics And Space Science, Ximena Clara Cuicatl Cid
Investigations In The Impact Of Visual Cognition And Spatial Ability Of Student Comprehension Of Physics And Space Science, Ximena Clara Cuicatl Cid
Physics Dissertations - Archive
Physics and Space Science examine topics that are highly spatial in nature. Students are required to visualize a system, manipulate that system, and then solve a given problem. Doing all of this, simultaneously, can lead to a cognitive overload where the student is unable to correctly solve the problem. Some difficulties may be rooted in conceptual difficulties, whereas other difficulties may arise from issues with spatial intelligence and visual cognition. In some cases, students might have created an incorrect mental image of the problem to begin with, and it's this misconception, not the lack of content knowledge, that has caused …
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. …
Evaluation Of Building Information Modeling (Bim) For Water Transmission Pipelines, Rakesh Gopala Raju Doraiswamy
Evaluation Of Building Information Modeling (Bim) For Water Transmission Pipelines, Rakesh Gopala Raju Doraiswamy
Civil Engineering Theses - Archive
In the construction industry, water transmission pipelines projects typically require two-dimensional drawings for transferring design data to the field. These drawings are referred as construction documents and serve as the source documents for subsequent facility management. However, two-dimensional drawings become difficult to interpret when there are too many entities involved needing information. In addition, when there are too many drawings for separate components such as plans, sections, and details, the chances of errors and omissions are more likely to happen. On the other hand, Building Information Modeling (BIM) is a new trend in construction industry and is being increasingly used …
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. …
An Investigation Of The Conceptual Understanding Of Continuity And Derivatives In Calculus Of Emerging Scholars Versus Non-Emerging Scholars Program Students, Susan Lai Chan
Mathematics Theses - Archive
The Emerging Scholars Program (ESP) has been adapted at colleges and universities across the nation in efforts to increase student access to Science, Technology, Engineering and Mathematics (STEM) disciplines. This study uses a written assessment to gain insight regarding conceptual knowledge on continuity and derivatives for ESP students versus non-ESP students in the same lecture course in first semester calculus at large urban university in the southwest. We analyze the assessment results of 22 ESP and 48 non-ESP students and discuss findings, particularly, those that indicate statistically significant differences regarding continuity over an interval.
Predictive Model For Bigheaded Carps In Mississippi River, Jitendra K. Shrestha
Predictive Model For Bigheaded Carps In Mississippi River, Jitendra K. Shrestha
Mathematics Theses - Archive
Bigheaded carps refer to two species of fish called Silver carp and Bigheaded carp which have invaded the Upper Mississippi River System and are causing nuisance to the native fish like catfish, paddlefish and gizzard Shad by encroaching their habitat. The exponential growth of their population due to their overwhelming reproduction capability and adaptation features calls for a careful study of their population dynamics. In this study, we offer a mathematical model with artificial excessive fishing effort to reduce the population of Bigheaded carps. We numerically observe the correlation among growth rate, fishing rate and the future population of the …
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 …
Three-Dimensional Multimedium Computational Model For Drug Delivery Using Finite Element Analysis, Eduardo Martinez
Three-Dimensional Multimedium Computational Model For Drug Delivery Using Finite Element Analysis, Eduardo Martinez
Bioengineering Theses - Archive
Approximately 2.8% of trauma patients present peripheral nerve injury, which can result in loss of motor function. Current strategies for peripheral nerve repair had focused on the development of synthetic nerve conduits that provide physical guidance. One advantage of the synthetic nerve conduits is that the conduit can be utilize as a delivery system and gain the ability to deliver neurotrophic factors, which have an effect on controlling the survival, migration, proliferation, and differentiation of different neural cell types. Currently there is no method to quantify the concentration of growth factors in the nerve conduit during the implantation time. In …
Microstructural Evolution Of Surface Layers During Electrolytic Plasma Processing, Cristian Cionea
Microstructural Evolution Of Surface Layers During Electrolytic Plasma Processing, Cristian Cionea
Material Science and Engineering Dissertations - Archive
Electrolytic Plasma Processing is an emerging technology for surface modification. The EPP process is based on electrolysis of an aqueous electrolyte by application of an electrical potential between the workpiece and counter-electrode, and the production of plasma (micro-arc discharges on the workpiece surface). The plasma micro-arcs provide a heat source for surface modification via localized surface melting and rapid cooling (cleaning process) and, if desirable, enhance ion deposition on a given substrate (coating). Three substrates (low carbon steel, pure Al and pure Ti) were "cleaned" by EPP and their near surface layer microstructure was studied. It was found that the …
Bubble Template Synthesis Of Hollow Gold Nanoparticles And Their Applications As Theranostic Agents, Chienwen Huang
Bubble Template Synthesis Of Hollow Gold Nanoparticles And Their Applications As Theranostic Agents, Chienwen Huang
Material Science and Engineering Dissertations - Archive
Hollow gold nanoparticle with a sub-30nm polycrystalline shell and a 50 nm hollow core has been successfully synthesized through the reduction of sodium gold sulfite by electrochemically evolved hydrogen. Such hollow gold nanoparticles exhibit unique plasmonic properties. They strongly scatter and absorb near infrared light. In this thesis we seek to understand the formation mechanism of hollow gold nanoparticles in this new synthesis process and their plasmonic properties. Also, we explore their biomedical applications as theranostic agents (therapeutic and diagnostic imaging). A lithographically patterned electrode consisting of Ag stripes on a glass substrate was used to investigate the formation process …
Study On The Leakage Current Behavior And Conduction Mechanism Of Porous Low-K In Cu/Porous Low-K Interconnects: The Influence Of Extrinsic Factors, Liangshan Chen
Material Science and Engineering Dissertations - Archive
This study investigates the influence of extrinsic factors including moisture and impurities trapped in porous low-k (PLK) and defective diffusion barrier on the leakage current behavior and the associated conduction mechanism of PLK in advanced Cu/PLK interconnects. For this purpose, a voltammetry technique that was previously developed for diffusion barrier characterization was extended to detect the trapped impurities in PLK. With this technique in hand, the influence of extrinsic factors was then studied. Cu was found to diffuse out into PLK through barrier defects in the presence of electric stress. Its out-diffusion and subsequent migration in PLK manifested as a …
Nanocrystalline Piezoresistive Polysilicon Film Obtained By Aluminum Induced Crystallization For Pressure Sensing Applications, Suraj Kumar Patil
Nanocrystalline Piezoresistive Polysilicon Film Obtained By Aluminum Induced Crystallization For Pressure Sensing Applications, Suraj Kumar Patil
Material Science and Engineering Dissertations - Archive
The overall objective of our research was to integrate various sensors on to a single flexible substrate for multi-sensory information gathering. Additional capabilities could be incorporated towards the realization of 'smart skin' for simultaneous and real time sensing of various mechanical, biological and chemical stimuli. Recent research venues are dictated by the trend of shifting from conventional silicon (Si) substrates to lower weight, low profile, structurally robust and lower cost flexible substrates. These flexible substrates easily conform to non-planar objects, could be batch fabricated at lower cost and enable multilayer construction. This would eventually evolve into seamless assimilation of sensors …