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Articles 2281 - 2310 of 2904
Full-Text Articles in Engineering
Preparation Of Pyramidal Zinc Oxide Particle As An Antireflective Coating For Application In Solar Cell., Amit Banik
Preparation Of Pyramidal Zinc Oxide Particle As An Antireflective Coating For Application In Solar Cell., Amit Banik
Electrical Engineering Theses - Archive
There is a lot of research going on in the field of solar cell to increase the energy conversion efficiency. Many new methods have been implemented and new processes and materials have been suggested in the recent past. This research deals with the preparation of pyramidal structure zinc oxide particles as an antireflective coating for polycrystalline and non-silicon solar cell. The process involved a cost effective method that is electrochemical deposition of zinc oxide on silicon mold. The mold, inverted pyramid, is prepared by photolithographic process PECVD silicon nitride as the hard mask and wet etching and then electrochemical deposition …
Design Of Microwave Non-Redundant Band-Pass Filter Using Microstrip And Edge Coupled Sections, Vinoj Vijayan Pillai
Design Of Microwave Non-Redundant Band-Pass Filter Using Microstrip And Edge Coupled Sections, Vinoj Vijayan Pillai
Electrical Engineering Theses - Archive
Microwave filler design using the non-redundant method relies on using the quarter wave Unit Elements (U.E's) to create a complex pole and hence augment the filter skirt response as against the redundant method wherein the U.E's do not contribute towards the filtering action. Filters realized using this method may have series high impedance capacitors, which are not realizable in planar microstrip technology. This thesis proposes a method to integrate microstrip transmission line and coupled line elements to circumvent the problem of realizing series capacitance. The total number of transmission line elements required to realize the filter is the minimum number …
Performance Analysis Of Space - Time Block Coded Multiple Antenna Systems, Varsha Rao Bolar
Performance Analysis Of Space - Time Block Coded Multiple Antenna Systems, Varsha Rao Bolar
Electrical Engineering Theses - Archive
Multiple input and multiple output(MIMO) communications are seen as key technology to achieve high data rates for next generation of air interfaces like Wifi, WiMAX, and 3GPP-LTE, because of the spatial dimension complementing time (TDM), frequency (FDM), and code (CDM) multiple access technologies. MIMO technology has many captivating characteristics such as, it offers significant increases in data throughput and link range without additional bandwidth or transmit power. It achieves this by higher spectral efficiency (more bits per second per hertz of bandwidth) and diversity (reduced fading). Because of these properties, MIMO is a current theme of international wireless research. Diversity …
A Portable Biotelemeter For Batteryless Gerd Sensors, Sandeep Battula
A Portable Biotelemeter For Batteryless Gerd Sensors, Sandeep Battula
Electrical Engineering Theses - Archive
In many medical problems, a continuous monitoring of the disease in vivo is essential to prevent further deterioration of health. The monitoring usually exceeds 24 hours. With the help of current advanced technologies, micro-medical devices are built to sense the internal physiological conditions in patients. Telemetry is used to transmit information to an external monitoring device. For the convenience and comfort of the patient, these monitoring systems should have low power consumption and be portable. This work discusses the design of a low power portable biotelemeter for batteryless Gastro esophageal reflux disease (GERD) sensors which can detect acid and non-acid …
Analysis And Modeling Of Self Heating In Silicon Germanium Heterojunction Bipolar Transistors, Kevin Bastin
Analysis And Modeling Of Self Heating In Silicon Germanium Heterojunction Bipolar Transistors, Kevin Bastin
Electrical Engineering Theses - Archive
Silicon Germanium (SiGe) hetero junction bipolar transistors (HBTs) have established itself as strong technology contender for a host of circuit applications including analog, mixed signal and Radio Frequency (RF). Due to the effect of technology scaling, self heating plays a significant role in the performance of SiGe HBTs. This thesis paper does an extensive analysis on the effect of self heating and uses different methods to extract the self heating parameters. An expression for thermal resistance considering thermal conductivity as a function of temperature is derived. Also a method to convert a multi pole thermal model to a single pole …
Preliminary Investigation Of Six Degree Of Freedom Human Steadiness Measurement Using A Performance Theory Framework, Jonathan Daniel Armstrong
Preliminary Investigation Of Six Degree Of Freedom Human Steadiness Measurement Using A Performance Theory Framework, Jonathan Daniel Armstrong
Electrical Engineering Theses - Archive
Tremor is an undesired oscillatory movement of a body segment which limits a person's ability to accomplish tasks. A conceptually sound, single number measure reflecting steadiness (defined as the inverse of tremor) of body segment is desired. Technology has advanced to make six degree of freedom (DOF) characterization of motion feasible, but the challenge remains regarding how to process time series data from multiple DOFs to achieve the single number composite measure. Previous conceptual work has applied General Systems Performance Theory (GSPT) to this problem. This thesis reports the investigation of steadiness composite measure formation. Three composite formation candidates were …
Analysis Of The Spatial Correlation Measurements For The Multiple Input Multiple Output (Mimo) Channel Using Anechoic Chamber Measurement Methodologies To Evaluate Over-The-Air (Ota) Testing Techniques, Digvijay Arjunrao Jadhav
Analysis Of The Spatial Correlation Measurements For The Multiple Input Multiple Output (Mimo) Channel Using Anechoic Chamber Measurement Methodologies To Evaluate Over-The-Air (Ota) Testing Techniques, Digvijay Arjunrao Jadhav
Electrical Engineering Theses - Archive
There are numerous constraints in defining an Over-The-Air (OTA) test due to the practical hardware restrictions present in an anechoic chamber. It is necessary to evaluate the test signals used in OTA testing to verify that the real world multipath propagation can be recreated for OTA testing inside an anechoic chamber. The objective of this measurement is to check whether the parameter, `Spatial Correlation' can be used to compare OTA test signals used in the MIMO OTA testing. Spatial Correlation has prime importance from the point of view of MIMO channel modeling. It's a key factor in determining the MIMO …
Error Concealment Techniques In H.264/Avc For Video Transmission Over Wireless Networks, Vineeth Shetty Kolkeri
Error Concealment Techniques In H.264/Avc For Video Transmission Over Wireless Networks, Vineeth Shetty Kolkeri
Electrical Engineering Theses - Archive
Several error concealment methods are applied to H.264/AVC (Advanced Video Coding) baseline profile such that the decoded video is error free. The error concealment techniques are implemented both in the spatial and temporal domains. The original and error concealment video sequences are compared in terms of MSE (Mean Square Error), PSNR (Peak-to-peak Signal to Noise Ratio) and SSIM (Structural Similarity Index Metric). This comparision has demonstrated that the error concealment methods are very effective in improving the visual quality. Implementation complexity also has been considered as the video transmission in baseline profile is meant for wireless networks.
An Efficient Piecewise Linear Network, Rohit Rawat
An Efficient Piecewise Linear Network, Rohit Rawat
Electrical Engineering Theses - Archive
A Piecewise Linear Network (PLN) is a local network that offers the accuracy of higher order networks and the Multi Layer Perceptron (MLP), with the computational simplicity of linear networks. A method to design a PLN is demonstrated and several clustering algorithms, used in the design procedure, are compared. The performance of the Self Organizing Map (SOM) clustering algorithm has been found to be slightly better than the other clustering methods. Methods to determine the appropriate threshold in the Sequential Leader algorithm have been studied. A binary search based approach was found to be the most efficient in terms of …
A Frequency Domain Approach For Time-Reversal Of Microwave Impulses, Shaoshu Sha
A Frequency Domain Approach For Time-Reversal Of Microwave Impulses, Shaoshu Sha
Electrical Engineering Theses - Archive
In this thesis, a compact and low-cost electronic circuit system is designed for time-reversal of microwave impulses with nanosecond and sub-nanosecond temporal durations. A frequency domain approach is adopted in order to avoid high sampling rate in time. The proposed system obtains the discrete spectra of input impulses first, then realizes time-reversal in frequency domain, and finally synthesizes the time-reversed impulses using discrete continuous wave elements. It is composed of commercially available circuits including oscillators, mixers/multipliers, band-pass-filters, amplifiers, and switches, hence embodies low-cost system-on-chip implementation. The proposed time-reversal circuit's performance is verified by Advanced Design System (ADS) simulations, with most …
Utilizing Physical Layer Information To Improve Rfid Tag Identification, Rushikesh Shree Khasgiwale
Utilizing Physical Layer Information To Improve Rfid Tag Identification, Rushikesh Shree Khasgiwale
Electrical Engineering Theses - Archive
Radio-frequency identification (RFID) systems are designed for fast and accurate identification of multiple RFID tags. Their performance depends on the effective detection andresolution of communication collisions caused by the presence of multiple tags in the reader's field. Present RFID protocols do not rely upon the received physical waveform obtainedduring a collision for either collision resolution or improved identification rate. This signal contains important information that is often ignored or otherwise discarded.In this thesis I analyze the physical layer information extracted from a collision waveform from the ISO-18000-6C protocol and identifypotentially performance enhancing information contained therein. Utilization of this information to …
Athena - Rfid Tag Metrics, Amit Jain
Athena - Rfid Tag Metrics, Amit Jain
Electrical Engineering Theses - Archive
In this thesis we have developed a Metric which is a numerical value representing the readability and performance characteristic of an RFID tagged object. The metric value ranges from 0 -100 and is given a unit of Athena, where a higher number specifies a better performing tag. The major parameters on which the metric value depends are frequency at which RFID system is working, transmitted power by the reader, and the received signal strength from the tag. All the parameters used for the Metric evaluation are well within the FCC regulations for passive UHF RFID system. Choosing the best performing …
Localization System For Uav/Ugv In Urban Environments, Vishal Savio Coelho
Localization System For Uav/Ugv In Urban Environments, Vishal Savio Coelho
Electrical Engineering Theses - Archive
An implementation of relative localization of wireless sensor nodes using a potential field method is presented in this work. The system is designed to assist in UAV/UGV navigation in urban environments like rooms and passageways of buildings. An unmanned vehicle will need to rely on ground-based sensors to help it navigate indoors, as GPS signals are severely attenuated and reception is intermittent.A sufficient number of sensors are first deployed throughout the terrain in a random fashion. They must then localize themselves to the environment, i.e. they must develop an internal frame of reference or co-ordinate system. A potential field method …
Effects Of Cyclic Strain And Growth Factors On Vascular Smooth Muscle Cell Responses, Kytai Truong Nguyen, Hao Xu
Effects Of Cyclic Strain And Growth Factors On Vascular Smooth Muscle Cell Responses, Kytai Truong Nguyen, Hao Xu
Bioengineering Faculty Publications - Archive
Under physiological and pathological conditions, vascular smooth muscle cells (SMC) are exposed to different biochemical factors and biomechanical forces. Previous studies pertaining to SMC responses have not investigated the effects of both factors on SMCs. Thus, in our research we investigated the combined effects of growth factors like bFGF (basic fibroblast growth factor), TGF-�� (transforming growth factor ��) and PDGF (platelet-derived growth factor) along with physiological cyclic strain on SMC responses. Physiological cyclic strain (10% strain) significantly reduced SMC proliferation compared to static controls while addition of growth factors bFGF, TGF-�� or PDGF-AB had a positive influence on SMC growth …
Topology Optimization Using Hyper Radial Basis Function Network, Aditya P. Apte
Topology Optimization Using Hyper Radial Basis Function Network, Aditya P. Apte
Mechanical and Aerospace Engineering Dissertations - Archive
Topology optimization has been conventionally used in automobile and aerospace industries to produce lightweight structures for minimum compliance or maximum fundamental frequency. Today, topology optimization finds application in solving diverse types of problems ranging from medicine to consumer products. Popular continuum based method SIMP fails to provide global solution due to too many variables involved. In this work, a novel hyper radial basis function network is presented as topology description function. The proposed approach provides drastic reduction in number of design variables involved in topology optimization. This makes the use of heuristic global solution possible. Parallel processing, reanalysis formulation and …
Optimal-Control Theoretic Methods For Optimization And Regulation Of Distributed Parameter Systems, Jennifer Dawn Goss
Optimal-Control Theoretic Methods For Optimization And Regulation Of Distributed Parameter Systems, Jennifer Dawn Goss
Mechanical and Aerospace Engineering Dissertations - Archive
Optimal control and optimization of distributed parameter systems are discussed in the context of a common control framework. The adjoint method of optimization and the traditional linear quadratic regulator implementation of optimal control both employ adjoint or costate variables in the determination of control variable progression. As well both theories benefit from a reduced order model approximation in their execution. This research aims to draw clear parallels between optimization and optimal control utilizing these similarities. Several applications are presented showing the use of adjoint/costate variables and reduced order models in optimization and optimal control problems. The adjoint method for shape …
Transient Flow Analysis Of Filling In Pulse Detonation Engine, Veera Venkata Suneel Jinnala
Transient Flow Analysis Of Filling In Pulse Detonation Engine, Veera Venkata Suneel Jinnala
Mechanical and Aerospace Engineering Theses - Archive
The Pulse Detonation Engine (PDE) is considered to be a propulsion system of future air vehicles. The objective of the present study is to model an efficient inlet system for filling the detonation tube completely with the fuel/air mixture. In the present study the filling processes is modeled numerically using CFD code FLUENTTM. Calculations for the gas flow are carried out by solving the Navier-Stokes equations coupled with the k- ? turbulence model. Five different inlet configurations were proposed and simulated in both two-dimensionally and three-dimensionally. The model with an orifice plate at the inlets ensured the desired optimum results. …
Guidance Of Receiver Aircraft To Rendezvous With Tanker In The Presence Of Wind, Jane-Wit Kampoon
Guidance Of Receiver Aircraft To Rendezvous With Tanker In The Presence Of Wind, Jane-Wit Kampoon
Mechanical and Aerospace Engineering Theses - Archive
This thesis work addresses the problem of aircraft rendezvous in the presence of prevailing wind for automated aerial refueling operations. A modified point-parallel rendezvous procedure is defined. The tanker aircraft performs a racetrack maneuver along a pre-specified refueling orbit. The receiver aircraft enters the refueling area through a fixed point and flies along the refueling line that is aligned with on of the straight legs of the race track. It is the responsibility to meet the tanker at the rendezvous point. A virtual target is used to define the trajectory of the refueling orbit. A nonlinear guidance algorithm is used …
Experimental Investigation Of Flow Boiling And Spray Cooling On Enhanced Surfaces In Fc-72, Gilberto Morenp
Experimental Investigation Of Flow Boiling And Spray Cooling On Enhanced Surfaces In Fc-72, Gilberto Morenp
Mechanical and Aerospace Engineering Dissertations - Archive
In this study the effect of a recently developed, thermally conductive microporous coating on flow boiling and spray cooling performance was studied using FC-72 as the working fluid. The overall goal is to further increase heat transfer in forced convection systems and in doing so, provide a viable option for future cooling applications. In flow boiling, the coating increased heat transfer coefficients by as much as 400% and produced values exceeding 40,000 W-m-2 K-1. This enhancement is believed to be a result of both an increase in active nucleation sites and a decrease of the superheated liquid layer. It is …
A Comprehensive Study Of Recycled Concrete Aggregates As A Drainable Base Layer For Pavements, Juan Bosquez
A Comprehensive Study Of Recycled Concrete Aggregates As A Drainable Base Layer For Pavements, Juan Bosquez
Civil Engineering Dissertations - Archive
The use of recycled materials in construction is becoming increasingly popular due to the shortage of raw materials. Coupled with the environmental concerns surrounding the quarrying of natural minerals, waste materials are being considered as viable replacement sources. By recycling waste materials, available landfill space is increased and costs of transportation are reduced. This dissertation study was conducted to evaluate the use of recycled concrete aggregates as flexible base as per the requirements of the Texas Department of Transportation (2004). Two sources of recycled aggregates and one source of natural limestone aggregate were collected from the Dallas/Fort Worth Area and …
Reliability Of Advanced Dielectrics In Gate Oxide And Device Level Packaging In Mems, Mohammad Shahriar Rahman
Reliability Of Advanced Dielectrics In Gate Oxide And Device Level Packaging In Mems, Mohammad Shahriar Rahman
Electrical Engineering Dissertations - Archive
The focus of this work is to study the feasibility, reliability and applicability of advanced dielectrics in both Metal Oxide Semiconductor Field Effect Transistor (MOSFET) gate oxide and device level packaging for Microelectromechanical Systems (MEMS). The scaling of silicon based MOSFET is approaching physical limits imposed by atomic structure. This continuous scaling trend of complementary MOSFET technologies introduces new challenges relating to power, heat and device behavior. To overcome the power dissipation and heating problems arising from gate leakage, high dielectric constant (high-k) materials are proposed. Hafnium based high-k dielectric layers and metal gate electrodes have been extensively investigated as …
Optimization Of Hydrogen Filling Station, Weiping Xiao
Optimization Of Hydrogen Filling Station, Weiping Xiao
Electrical Engineering Theses - Archive
Due to the price hike of the fossil fuel and the concern of the global warming, the hydrogen economy can be envisioned to address those problems. After the Energy Bill was announced in 2005, a transition of national energy system from hydrocarbon to hydrogen had been recognized. However, safe and convenient refueling and widespread availability of hydrogen from various energy sources are the prerequisite for the development of hydrogen economy. This research focuses on the hydrogen filling station with on-site hydrogen production by electrolysis of water. The virtual wind farm and on-site installed photovoltaic (PV) supply the main and renewable …
Battery Identification Methods Based On Equivalent Circuit Model, Matthew Cole Ragsdale
Battery Identification Methods Based On Equivalent Circuit Model, Matthew Cole Ragsdale
Electrical Engineering Theses - Archive
Development of an intelligent battery diagnostic system is a necessity for future transportation industry. These technologies will have the potential to create profound impact in other industries such as portable electronics. This thesis reports on battery identification methods that are primarily engineered to detect the chemistry, number of cells, and state of charge in an unknown package of batteries. The proposed methods have the potential to be used for condition monitoring in a known set of batteries thereby, creating a health monitoring apparatus that can be an integral part of a battery management system using any of the prominent lead …
Blocking Reader: Design And Implementation Of A Low-Cost Passive Uhf Rfid Blocking Reader, Gaurov Narayanaswamy
Blocking Reader: Design And Implementation Of A Low-Cost Passive Uhf Rfid Blocking Reader, Gaurov Narayanaswamy
Electrical Engineering Theses - Archive
In this thesis I present a low-cost passive UHF ISO 18000-6C RadioFrequency Identification, or RFID, reader that is feasible for mobileand privacy applications. Low cost readers are necessary to achievethe promised cost savings and enhanced revenue generation that theInternet of Things promises to deliver. Low cost readers may beinstalled virtually everywhere, providing real-time asset monitoringand a host of new and innovative applications yet to be conceived.While pervasively deployed readers provide tremendous benefits, thepromiscuous nature of the 18000-6C tags means that the readers alsopose a threat to personal security and privacy. Privately owned tags on a person will be read by …
Dlp Hyperspectral Imaging For Surgical And Clinical Utility, Robert Paul Francis
Dlp Hyperspectral Imaging For Surgical And Clinical Utility, Robert Paul Francis
Bioengineering Theses - Archive
Surgeons want technology to help them see differences in tissue chemistry. If they know how oxygenated tissues and organs are during medical procedures, they are more able to eliminate dangerous tissues and maintain viable organs. Hyperspectral imaging non-invasively measures the optical absorbance spectrum of each pixel in a spatial field of view and, with chemometric image processing, can visualize the spatial distribution of tissue oxygenation. Current hyperspectral imaging systems are too slow to monitor real-time physiological changes in live tissue. Therefore, a novel DLP Hyperspectral Imaging (DLP HSI) system is developed for real-time, non-invasive, in-vivo imaging of tissue chemistry in …
A Novel Device For The Establishment Of An Animal Model Mimicking Spinal Deformity Surgery For Neurological Deficit Risk Mitigation, Bradley Elmer
A Novel Device For The Establishment Of An Animal Model Mimicking Spinal Deformity Surgery For Neurological Deficit Risk Mitigation, Bradley Elmer
Bioengineering Theses - Archive
Correction forces during spine deformity surgery impart significant multidirectional stress forces to the spinal cord, which in some cases result in severe damage to the spinal cord and permanent paralysis, the most feared complication. Animal models are critical for the development of neuroprotective strategies. However, those currently available are limited to contusion, transection, or unidirectional distraction injuries, which fail to replicate the multidirectional forces that occur during spine corrective surgery. In order to develop an improved model of distraction spinal cord injury we designed a device based on intervertebral grip fixation and linear actuators, capable of inducing controllable bidirectional distraction …
In Situ Crosslinkable Polyesters For Tissue Engineering And Drug Delivery, Dipendra Raj Gyawali
In Situ Crosslinkable Polyesters For Tissue Engineering And Drug Delivery, Dipendra Raj Gyawali
Bioengineering Theses - Archive
In situ crosslinkable elastic materials are increasingly being explored for various biomedical applications such as drug delivery and tissue engineering due to their site specific nature. The creation of an in situ crosslinkable elastomer rich in pendant chemistry has been a challenge in the field of biomaterials. Herein, we have developed two new in situ biodegradable materials: poly(octamethylene maleate citrates) (POMC) and poly(poly(ethylene glycol) maleate citrate) (PPEGMC). These materials are all low molecular weight in their pre-polymeric form, which shows their potential to be used as an injectable biomaterial. The preservation of pendant carboxylic and hydroxyl groups in these polymeric …
Development Of An Optical Spectroscopic Method To Detect Neurohemodynamic Changes Induced By Pain In Rats, Sweta Narvenkar
Development Of An Optical Spectroscopic Method To Detect Neurohemodynamic Changes Induced By Pain In Rats, Sweta Narvenkar
Bioengineering Theses - Archive
In my optical spectroscopy study, multi-channel, thin optical probes with short source-detector separation have been implemented, calibrated, and used along with a multi-channel spectrometer as a quantitative technique to observe changes in vascular hemoglobin concentration and hemoglobin oxygen saturation as well as light scattering of tissues. Each of the four needle probes used in my study consists of two bifurcated fibers; one fiber is connected to a halogen light source and the other fiber to a CCD-array spectrometer having a spectral window from 450 nm to 900 nm. Each fiber is 100 micron in diameter. As we utilized the four …
Integration Of Data Mining Algorithms And Control Charts For Multivariate And Autocorrelated Processes, Weerawat Jitpitaklert
Integration Of Data Mining Algorithms And Control Charts For Multivariate And Autocorrelated Processes, Weerawat Jitpitaklert
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
The objective of this dissertation is to integrate state-of-the-art data mining algorithms with statistical process control (SPC) tools to achieve efficient monitoring in multivariate and autocorrelated process. Process monitoring and diagnosis have been widely recognized as important and critical tools in system monitoring for detection of abnormal behavior and quality improvement. Although traditional SPC tools are effective in simple manufacturing processes that generate a small volume of independent data, these tools are not capable of handling the large streams of multivariate and autocorrelated data found in modern manufacturing/service systems. As the limitations of SPC methodology become increasingly obvious in the …
Nonlinear Dynamic Analysis Of Hybrid Frames, Dobrinka Radulova
Nonlinear Dynamic Analysis Of Hybrid Frames, Dobrinka Radulova
Civil Engineering Theses - Archive
This study proposes a hybrid frame system consisting of rigid and semi-rigid connections subjected to a dynamic loading. Two building geometries are chosen to represent low-rise and high-rise buildings. Multiple locations for placement of semi-rigid connections are proposed, and the hybrid systems with the most efficient energy dissipation are identified. During this analysis, five earthquake records are used to provide a spectrum of frequencies. Five practical semi-rigid connection types and one connection with analytical parameters are also modeled into the selected hybrid combinations by applying zero-length springs at the ends of beams, in which their nonlinear constitutive relation is defined …