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Full-Text Articles in Engineering
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
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 …
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
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 …
Modeling An Instrumented (Tractor-Semitrailer Combination) Vehicle: Using System Identification Methods, Bito Irie
Electrical Engineering Theses
In this thesis, properties of the input-output relationships of a tractor-semitrailer combination vehicle were analyzed. Predictive models of the system were identified using only input-output data collected separately but for the same portion of the road. A vehicle equipped with an inertial profiling system and a strain gauge instrumented truck were used to collect the input and output data, respectively. Input-output combinations such as single-input-single-output (SISO), multiple-input-single-output (MISO), and multiple-input-multiple-output (MIMO) representing the vehicle models were investigated using the polynomial and state-space black-box modeling (i.e., system identification) techniques. Comparisons among measured and k-steps ahead predicted outputs and residual analysis were …
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
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 …
Performance Of Large Scale Steel Fiber Reinforced Concrete Deep Beam With Single Opening Under Monotonic Loading, Carlos Flores
Performance Of Large Scale Steel Fiber Reinforced Concrete Deep Beam With Single Opening Under Monotonic Loading, Carlos Flores
Civil Engineering Theses
The design of complex, discontinuous stress trajectory regions (D-regions) is complex in natureand cumbersome to design. The performance of a large scale steel fiber reinforced concrete (SFRC)deep beam with single opening under monotonic loading was tested under controlled conditions. Themain objective of this study was to see if Steel Fiber Reinforced Concrete (SFRC), used as a bettermaterial than reinforced concrete (RC) offered an alternate to the cumbersome and iterative stepsinvolved in strut-and-tie (STM) methodology. Additionally, a similar reinforced concrete (RC) specimenwas tested under the same controlled condition designed with classical strut-and-tie model designmethodology reinforced using conventional steel bars.Material testing was …
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
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
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 …
Morphology And Cathode Optimization For Efficient Polymer Bulk Heterojunction Solar Cells, Yi Yang
Morphology And Cathode Optimization For Efficient Polymer Bulk Heterojunction Solar Cells, Yi Yang
Material Science and Engineering Theses
Efficiency of polymer bulk heterojunction solar cell is highly dependent on the active layer morphology and can be controlled by specific experimental conditions. In this work, the influences of P3HT:PCBM blend composition, solution concentration, and the thermal annealing on the cell performance are presented. The maximum of Jsc and FF are reached when the weight percentage of PCBM in the blend is 60 % under which both high density of donor and accepter interfaces expecting the formation of efficient percolated electron transport paths. 36 mg/ml is found to be the optimum solution concentration for P3HT:PCBM blend and it can be …
Synthesis And Dip-Pen Nanolithographical Patterning Of Ferrite Nanoparticles, Jingwen He
Synthesis And Dip-Pen Nanolithographical Patterning Of Ferrite Nanoparticles, Jingwen He
Material Science and Engineering Theses
Magnetic nanoparticles are of great interest for researchers from a wide range of disciplines, including magnetic fluids, catalysis, biotechnology/biomedicine, magnetic resonance imaging, data storage, and environmental remediation. Ferrites, a class of ferrimagnetic ceramic compounds with the chemical formula of MFe₂O₄, where M represents any one of several metallic elements such as Mg, Fe, Co, Ni, Cu and so on, are commonly used magnetic materials for nanoparticles. Magnetite (Fe3O₄) is the prototype of ferrites. Magnetite nanoparticles have been prepared through the co-precipitation of Fe²⁺ and Fe³⁺ aqueous salt solutions by addition of base. They exhibit a size distribution from 4 nm …
On-Chip Liquid-Liquid Extraction And Separation Using Digital Microfluidics, Praveen Kunchala
On-Chip Liquid-Liquid Extraction And Separation Using Digital Microfluidics, Praveen Kunchala
Mechanical and Aerospace Engineering Theses
In this thesis, on-chip liquid-liquid microextraction and separation using electrowetting on dielectric (EWOD) digital microfluidics was demonstrated by considering room temperature ionic liquid (RTIL) and DI water as two liquid phases, which form immiscible interface with each other. Room temperature ionic liquids (RTILs) have been actively investigated as replacements for the organic solvents and various "task-specific" ionic liquids (TSIL) are being developed which exhibit many attractive properties such as selectivity to specific biomolecules. Liquid-liquid extraction and separation using EWOD digital microfluidic device with model extraction experiments have been demonstrated, one was extraction of organic dye from RTIL (1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [bmim][NTf2]) …
Thermal Conduction Equations For A Medium With An Inclusion Using Galerkin Method, Thiagarajan Sivalingam
Thermal Conduction Equations For A Medium With An Inclusion Using Galerkin Method, Thiagarajan Sivalingam
Mechanical and Aerospace Engineering Theses
The Galerkin method is used to semi-analytically solve the heat conduction equation in non-homogeneous materials. The problem under deliberation is a square plate with a circular inclusion having different thermal conductivities. A generalized procedure that involves the Galerkin method and formulation of the final solution in terms of the procured base functions is adopted. The Galerkin method basically involves expressing the given boundary value problem in terms of a standard mathematical relation, generating a set of continuous base functions, formulating the matrix equation, and determining the solution.For the non-homogeneous material, a set of base functions for the plate and inclusion …