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Articles 1 - 19 of 19
Full-Text Articles in Engineering
Nano-Magnetic Devices For Computation, Dinuka Karunaratne
Nano-Magnetic Devices For Computation, Dinuka Karunaratne
USF Tampa Graduate Theses and Dissertations
The continuous scaling down of the metal-oxide-semiconductor field-effect transistor (MOSFET)
has improved the performance of electronic appliances. Unfortunately, it has come to a
stage where further scaling of the MOSFET is no longer possible due to the physical and the
fabrication limitations. This has motivated researchers towards designing and fabricating novel
devices that can replace MOSFET technology. Carbon Nanotube Field-Effect Transistors, Single
Electron Tunneling Junctions, Nano-Magnetic Devices, and Spin Field-Effect Transistors are some
prospective candidates that could replace MOSFET devices. In this dissertation, we have studied
the computational performance of Nano−Magnetic Devices due to their attractive features such
as room …
Medium Power, Compact Periodic Spiral Antenna, Jonathan O'Brien
Medium Power, Compact Periodic Spiral Antenna, Jonathan O'Brien
USF Tampa Graduate Theses and Dissertations
Historical, well developed, procedures for RF design have minimal emphasis on exploring the third dimension due to the difficulty of fabrication. Recent material advancements applicable to 3D printing have brought about low-loss thermoplastics with excellent mechanical properties. Research into depositing conductive inks onto arbitrary 3D shapes has achieved resolutions better than 50 μm with conductivity values approaching that of copper cladding. The advancements in additive manufacturing have improved reliability and repeatability of three dimensional designs while decreasing fabrication time. With this design approach other considerations, such as stability and strength, can be concentrated on during the structure design to realize …
Self-Interference In Ofdm-Based Systems: Identification And Separation, Ertugrul Guvenkaya
Self-Interference In Ofdm-Based Systems: Identification And Separation, Ertugrul Guvenkaya
USF Tampa Graduate Theses and Dissertations
Orthogonal frequency-division multiplexing (OFDM) is communication technique that is robust against multipath spread, efficient in equalization implementation, and flexible in dynamic spectrum usage. With the need of wideband signals in high data rate communications, OFDM has gained widespread attention and usage as an efficient way of implementing multicarrier communication. Despite its prominent advantages, received signal quality degrades because of inter-symbol interference (IS) and inter-carrier interference (ICI) due to insufficient guard time in multipath channels and time variance as well as hardware impairments in OFDM systems. When several of the impairments occurs simultaneously, interferences combine at the receiver side. Thus, interference …
Towards Interference-Immune And Channel-Aware Multicarrier Schemes: Filters, Lattices, And Interference Issues, Alphan Sahin
Towards Interference-Immune And Channel-Aware Multicarrier Schemes: Filters, Lattices, And Interference Issues, Alphan Sahin
USF Tampa Graduate Theses and Dissertations
In this dissertation, multicarrier schemes are reviewed within the framework of Gabor Systems. Their fundamental elements; what to transmit, i.e., symbols, how to transmit, i.e., filters or pulse shape, and where/when to transmit, i.e., lattices are investigated extensively. The relations between different types of multicarrier schemes are discussed.
Within the framework of Gabor systems, a new windowing approach, edge windowing, is developed to address the out-of-band (OOB) radiation problem of orthogonal frequency division multiplexing (OFDM) based multicarrier schemes. To the best of our knowledge, for the first time, the diversity on the range of the users is exploited to suppress …
Prevention And Detection Of Intrusions In Wireless Sensor Networks, Ismail Butun
Prevention And Detection Of Intrusions In Wireless Sensor Networks, Ismail Butun
USF Tampa Graduate Theses and Dissertations
Wireless Sensor Networks (WSNs) continue to grow as one of the most exciting and challenging research areas of engineering. They are characterized by severely constrained computational and energy
resources and also restricted by the ad-hoc network operational
environment. They pose unique challenges, due to limited power
supplies, low transmission bandwidth, small memory sizes and limited energy. Therefore, security techniques used in traditional networks cannot be directly adopted. So, new ideas and approaches are needed, in order to increase the overall security of the network. Security applications in such resource constrained WSNs with minimum overhead provides significant challenges, and is the …
A Study On The Optimization Of Dye-Sensitized Solar Cells, Md Imran Khan
A Study On The Optimization Of Dye-Sensitized Solar Cells, Md Imran Khan
USF Tampa Graduate Theses and Dissertations
Considering biocompatibility, the Dye Sensitized Solar Cell (DSC) based on titanium dioxide should play a major role in the future of solar energy. In this ongoing study, different components and ambient process conditions for the fabrication of were investigated. Titanium dioxide substrate thickness and morphology was found to have a direct impact on the cell efficiency. Scanning Electron Microscopy (SEM) was used to investigate the TiO2 nanostructure. Different chemical treatments and electrolytes were also explored towards optimizing the cell performance. A group of porphyrin based organic dyes were synthesized and evaluated. Standard solar cell characterization techniques such as current-voltage and …
Thermal Infrared Reflective Metal Oxide Sol-Gel Coatings For Carbon Fiber Reinforced Composite Structures, Brandon Demar Richard
Thermal Infrared Reflective Metal Oxide Sol-Gel Coatings For Carbon Fiber Reinforced Composite Structures, Brandon Demar Richard
USF Tampa Graduate Theses and Dissertations
Recent trends in composite research include the development of structural materials with multiple functionalities. In new studies, novel materials are being designed, developed, modified, and implemented into composite designs. Typically, an increase in functionality requires additional material phases within one system. The presence of excessive phases can result in deterioration of individual or overall properties. True multi-functional materials must maintain all properties at or above the minimum operating limit. In this project, samples of antimony and cobalt-doped tin oxide (ATO(Co2O3)) sol-gel solutions are used to coat carbon fibers and are heat treated at a temperature range of 200 - 500 …
Synthesis, Characterization And Applications Of Barium Strontium Titanate Thin Film Structures, Supriya Ashok Ketkar
Synthesis, Characterization And Applications Of Barium Strontium Titanate Thin Film Structures, Supriya Ashok Ketkar
USF Tampa Graduate Theses and Dissertations
Barium Strontium Titanate (BST) based ferroelectric thin film devices have been popular over the last decade due to their versatile applications in tunable microwave devices such as delay lines, resonators, phase shifters, and varactors. BST thin films are promising candidates due to their high dielectric constant, tunability and low dielectric loss. Dielectric-tunable properties of BST films deposited by different deposition techniques have been reported which study the effects of factors, such as oxygen vacancies, film thickness, grain size, Ba/Sr ratio, etc. Researchers have also studied doping concentrations, high temperature annealing and multilayer structures to attain higher tunability and lower loss. …
User-Based Filter Utilization For Multicarrier Schemes, Zekeriyya Esat Ankarali
User-Based Filter Utilization For Multicarrier Schemes, Zekeriyya Esat Ankarali
USF Tampa Graduate Theses and Dissertations
Multicarrier modulation is a transmission technique that is quite convenient for high data rates in wireless communication. Information symbols are partitioned and parallelly sent over multiple narrowband subchannels. Pulse shaping filters are critically important in multicarrier
modulation for determining the characteristics of signal in time and frequency domains. In this thesis, we propose a new pulse shaping approach for multicarrier schemes to increase spectral efficiency in multi-user scenarios. Conventionally, the time-frequency lattice and the prototype filter are designed considering the worst-case of time-varying multipath channel. However, this approach ignores to make use of multi-user diversity and leads to excessive spacings …
Vapor-Liquid-Solid(Vls) Grown Silica (Siox) Nanowires As The Interface For Biorecognition Molecules In Biosensors, Eduardo Murphy-Pérez
Vapor-Liquid-Solid(Vls) Grown Silica (Siox) Nanowires As The Interface For Biorecognition Molecules In Biosensors, Eduardo Murphy-Pérez
USF Tampa Graduate Theses and Dissertations
SiOx nanowires grown through the VLS mechanism were electrophoretically deposited on top of Au electrodes. GOx was immobilized using APTES and the EDC-NHS chemistry. Cyclic Voltammetry was used as the method to characterize the electrodes through their processing steps, and CV was also used to detect glucose in a PBS based solution. Ferro-Ferri Cyanide couple was used as the mediator.
Reconfigurable Low Profile Antennas Using Tunable High Impedance Surfaces, David Cure
Reconfigurable Low Profile Antennas Using Tunable High Impedance Surfaces, David Cure
USF Tampa Graduate Theses and Dissertations
This dissertation shows a detailed investigation on reconfigurable low profile antennas using tunable high impedance surfaces (HIS). The specific class of HIS used in this dissertation is called a frequency selective surface (FSS). This type of periodic structure is fabricated to create artificial magnetic conductors (AMCs) that exhibit properties similar to perfect magnetic conductors (PMCs). The antennas are intended for radiometric sensing applications in the biomedical field. For the particular sensing application of interest in this dissertation, the performance of the antenna sub-system is the most critical aspect of the radiometer design where characteristics such as small size, light weight, …
Multidimensional Signal Analysis For Wireless Communications Systems, Ali Gorcin
Multidimensional Signal Analysis For Wireless Communications Systems, Ali Gorcin
USF Tampa Graduate Theses and Dissertations
Wireless communications systems underwent an evolution as the voice oriented applications evolved to data and multimedia based services. Furthermore, current wireless technologies, regulations and the un-
derstanding of the technology are insufficient for the requirements of future wireless systems. Along with the rapid rise at the number of users, increasing demand for more communications capacity to deploy multimedia applications entail effective utilization of communications resources. Therefore, there is a need for effective spectrum allocation, adaptive and complex modulation, error recovery, channel estimation, diversity and code design techniques to allow high data rates while maintaining desired quality of service, and reconfigurable …
Design, Manufacturing, And Assembly Of A Flexible Thermoelectric Device, Christopher Anthony Martinez
Design, Manufacturing, And Assembly Of A Flexible Thermoelectric Device, Christopher Anthony Martinez
USF Tampa Graduate Theses and Dissertations
This thesis documents the design, manufacturing, and assembly of a flexible thermoelectric device. Such a device has immediate use in haptics, medical, and athletic applications. The governing theory behind the device is explained and a one dimensional heat transfer model is developed to estimate performance. This model and consideration for the manufacturing and assembly possibilities are the drivers behind the decisions made in design choices. Once the design was finalized, manufacturing methods for the various components were explored. The system was created by etching copper patterns on a copper/polyimide laminate and screen printing solder paste onto the circuits. Thermoelectric elements …
Myoglobin Detection On Sic: Immunosensor Development For Myocardial Infarction, Alexandra Oliveros Villalba
Myoglobin Detection On Sic: Immunosensor Development For Myocardial Infarction, Alexandra Oliveros Villalba
USF Tampa Graduate Theses and Dissertations
Silicon carbide (SiC) has been around for more than 100 years as an industrial material and has found wide and varied applications because of its unique electrical and thermal properties. In recent years there has been increased attention on SiC as a viable material for biomedical applications. Among these applications are those where SiC is used as a substrate material for biosensors and biotransducers, taking advantage of its surface chemical, tribological and electrical properties.
In this work we have used the proven bio- and hema-compatibility of SiC to develop a viable biorecognition interface using SiC as the substrate material for …
Energy Efficient Context-Aware Framework In Mobile Sensing, Ozgur Yurur
Energy Efficient Context-Aware Framework In Mobile Sensing, Ozgur Yurur
USF Tampa Graduate Theses and Dissertations
The ever-increasing technological advances in embedded systems engineering, together with the proliferation of small-size sensor design and deployment, have enabled mobile devices (e.g., smartphones) to recognize daily occurring human based actions, activities and interactions. Therefore, inferring a vast variety of mobile device user based activities from a very diverse context obtained by a series of sensory observations has drawn much interest in the research area of ubiquitous sensing. The existence and awareness of the context provides the capability of being conscious of physical environments or situations around mobile device users, and this allows network services to respond proactively and intelligently …
Control Of Smart Building Using Advanced Scada, Vivin Thomas Samuel
Control Of Smart Building Using Advanced Scada, Vivin Thomas Samuel
USF Tampa Graduate Theses and Dissertations
ABSTRACT
For complete control of the building, a proper SCADA implementation and the optimization strategy has to be build. For better communication and efficiency a proper channel between the Communication protocol and SCADA has to be designed.
This paper concentrate mainly between the communication protocol, and the SCADA implementation, for a better optimization and energy savings is derived to large scale industrial buildings. The communication channel used in order to completely control the building remotely from a distant place. For an efficient result we consider the temperature values and the power ratings of the equipment so that while controlling the …
Processing Of Advanced Two-Stage Cigs Solar Cells, Manikandan Sampathkumar
Processing Of Advanced Two-Stage Cigs Solar Cells, Manikandan Sampathkumar
USF Tampa Graduate Theses and Dissertations
An advancement of the two stage growth recipe for the fabrication of CIGS solar cells was developed. The developed advancement was inconsistent in producing samples of similar stoichiometry. This was a huge barrier for up scaling the process as the behavior of devices would be different due to variation in stoichiometry. Samples with reproducible stoichiometry were obtained once the heating rate of elements, selenium in particular was better understood. This is mainly attributed to the exponential increase of selenium flux after its evaporation temperature. Monitoring the selenium flux was vital in getting constant selenium fluxes. Few changes to the growth …
Modeling, Analysis And Control Of Voltage-Source Converter In Microgrids And Hvdc, Ling Xu
Modeling, Analysis And Control Of Voltage-Source Converter In Microgrids And Hvdc, Ling Xu
USF Tampa Graduate Theses and Dissertations
The objective of this dissertation is to carry out dynamic modeling, analysis and control for Voltage-Source Converters (VSC). Two major applications of VSC will be investigated in this dissertation: microgrid application and High Voltage Direct Current (HVDC) application.
In microgrid applications, VSC is used to integrate distributed energy sources such as battery and provide system functions: such as real and reactive power regulation, voltage and frequency support during islanding condition, and abnormal system condition mitigation. In HVDC applications, VSC is used to interconnect dc systems with ac systems. The functions supplied by VSC are similar to that in microgrids. However, …
A Biocompatible Sic Rf Antenna For In-Vivo Sensing Applications, Shamima Afroz
A Biocompatible Sic Rf Antenna For In-Vivo Sensing Applications, Shamima Afroz
USF Tampa Graduate Theses and Dissertations
A continuous glucose sensor employing radio frequency (RF) signals is presented using the biocompatible material Silicon Carbide (SiC). Unlike biosensors that require direct contact with interstitial fluids to trigger chemical reactions to operate, this biocompatible SiC sensor does not require a direct interface. The sensing mechanism for this SiC sensor is based upon a shift in resonant frequency, as a function of change in glucose levels, which electrically manifests itself as a change in blood permittivity and
conductivity. For in vivo applications the antenna sensor needs to operate inside the body environment, and it has been found that the best …