Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Yagi"”.
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Τυφώνας YAGI: Ο θανατηφόρος κυκλώνας που συγκλόνισε τον Ειρηνικό Ωκεανό (Σεπτέμβριος 2024)
Ο τροπικός τυφώνας Yagi υπήρξε ένας από τους ισχυρότερους και πιο καταστροφικούς κυκλώνες που έπληξαν τη Νοτιοανατολική Ασία τις τελευταίες δεκαετίες. Σχηματίστηκε στα τέλη Αυγούστου 2024 και επηρέασε κυρίως το Βιετνάμ και τη Νότια Κίνα, προκαλώντας ακραίες βροχοπτώσεις, εκτεταμένες πλημμύρες και …
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Study on the Intensity and Track Prediction of Typhoon Yagi (2024) Based on Ensemble Kalman Filter Assimilation of Satellite and Radar Data
… Filter (EnKF) on the prediction of Typhoon Yagi (2024). Based on the Weather Research and Forecasting (WRF) model and the EnKF method, a series of sensitivity experiments with different assimilated observational data types were conducted, including conventional observations, TCVitals data, …
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Fabrication and Optoelectronic Characterization of Nanoscale Resonance Structures
… were investigated: an antenna inspired Yagi-Uda array, and a metasurface inspired interdigitated structure. Experimental devices containing the nanoscale resonance structures were fabricated on semiconducting substrates forming metal-semiconductor-metal photodiodes. The spectral response …
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A concept for wildlife tracking using ultra high frequency (UHF) radio
… The signal sent by the transmitter detected by Yagi antenna as a receiver and was designed at a frequency of 315MHz with a gain is 10.68dBi. Received power detected by Yagi antenna shown at Anritsu Spectrum Analyzer. The highest differences between power received at vegetation area compared to …
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Superconducting Microwave Resonators for Low Loss Sensor Applications
… readout power behaviour. Finally, I propose the ‘Yagi-KID’, which incorporates a scheme for the CPW resonators de- signed previously to be DC biased. DC current has been used to tune resonator frequency and is predicted to suppress the superconducting gap and reduce pair-breaking frequency. I …
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Design And Analysis Of Adaptive And Reconfigurable Antennas For Wireless Communication
… four elements designed are: the reconfigurable Yagi, the reconfigurable corner-fed triangular loop antenna, the reconfigurable center-fed equilateral triangular loop antenna and the reconfigurable rectangular-spiral antenna. None of these antennas have been reported in the literature. Simulation …
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A Review of Setup Practices and Procedures for Creating IEEE 802.11 Wireless Community Networks
… antennas (including wire grid parabolic dishes, Yagi and Vagi styles, and echo backfire), wireless bridges, and other factors which influence overall signal strength and throughput. Two separate configurations are recommended. The first configuration is based on high reliability, longer …
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Moxon based RFID tag reader and GPS antenna
… cost. The Moxon antenna based on a two element Yagi-Uda antenna over the ground reflector is one of the most favorite antennas for HAM operators which can produce outstanding front to back ratio of radiated power, good match over the desired band and relatively low elevation height. A sequence …
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Application of base station with array of intelligent antennas in the energy distribution sector
… elements and automatically feeds an intelligent Yagi-Uda antenna array with the appropriate parameters, in order to optimize the radiation pattern in the desired directions. The newly presented model uses a stochastic optimization method to automatically achieve a set of optimal electrical …
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Reconfigurable microstrip antennas with tunable radiation pattern characteristics
… scanning antenna, where two elements microstrip Yagi-Uda antenna is used. The first element is a square patch driven with two probe feeds of quadrature phase for CP excitation. The second element is a parasitic square patch with narrow square-shaped slot carved on its surface. The parasitic patch …
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Analysis of Periodic and Random Capacitively-Loaded Loop (CLL) Metamaterial Structures for Antenna Enhancement Applications
… dipole antenna is compared to the conventional Yagi-Uda antenna. The structures presented in this thesis are modeled using full-wave simulation, and one antenna structure is experimentally verified as a proof-of-concept.
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The opportunities in Japan for raising capital for investment in domestic real estate market through securitization
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 1988.
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Alternative strategies for public transport improvement in developing countries : a case study of Beirut
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1994.
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INVESTIGATION OF SMALL ANTENNAS FOR PERSONAL HANDY PHONE USE
… is found that effects are similar to one or two Yagi-Uda antenna array. A surface-patch model is used for the analysis and agrees well with the experimental results. However, there are some limitations when using a surface patch model for obtaining the accuracy results for input impedance.
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RF-MEMS switches for reconfigurable antennas
… in pattern and frequency, three element Yagi-Uda antenna. The optimization of the antenna’s dimensions has been accomplished through the implementation of a novel technique based on Taguchi’s method, capable of systematically searching wider areas, named as “Grid-Taguchi” method.
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Superdirectivity and the Application of Complementary Split Ring Resonators in Directivity Enhancement of Millimeter-Wave Antennas
… and improve the directivity bandwidth, a Yagi-like array implementation is developed and verified experimentally. To introduce more degrees of freedom to the design, Low Temperature Co-fired Ceramic technology is used to design a multilayer wideband high gain antenna based on a single fed …
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Investigation and design of 5G antennas for future smartphone applications
… with compact elements such as Dipole and Quasi Yagi resonators for 5G smartphones. Compared with the recently reported designs, the proposed phased arrays exhibit satisfactory features such as compact size, wide beam steering, broad bandwidth, end-fire radiation, high gain, and efficiency …
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Flood Survival Strategies of Overwintering Snakes
This thesis investigates snake flood survival during hibernation and how anthropogenic habitat alteration and climate variability may affect habitat quality and overwintering survival. Chapter one reviews the current understanding of ecophysiology of hibernation in snakes. In chapter two, I …
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Simulation, Design and Implementation of Antenna for 5G and beyond Wave Communication. Simulation, Design, and Measurement of New and Compact Antennas for 5G and beyond and Investigation of Their Fundamental Characteristics
… arrays with tiny parts like Dipole and Quasi-Yagi resonators. In comparison to previously published designs, the suggested phased arrays have desirable qualities such as compact size, wide beam-steering, broad bandwidth, end-fire radiation, high gain, and efficiency. With a reduced mutual …
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Advanced light manipulation and waveguiding in plasmonic nanostructured optical fibers.
… (PM-PCF) and panda-shaped PM-optical fibers. A Yagi-Uda antenna-coupled low loss plasmonic slot waveguide is directly integrated on the optical fiber by direct milling technique. We demonstrated efficient coupling of light from the fiber core to the plasmonic slot waveguide. The light is then …
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