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 111 for “"X Band"”.
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X-Band Rapid-Scan EPR
… CW EPR.</p> <p>Finally, rapid-scan EPR at X-band was applied to spin trapping experiments. Superoxide was generated by the reaction of xanthine oxidase and hypoxanthine and trapped with BMPO. Spin trapping with 5-tert-butoxycarbonyl-5-methyl-1-pyrroline N-oxide (BMPO) to form BMPO-OOH adduct …
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Active limiting frequency selective surface at X-band
… existing literature. A new design operating at X-band is proposed using a square-plate element, and is simulated and measured for both small-signal and large-signal conditions. The measurements show that the concept is capable of non-linear limiting behavior with insertion loss comparable to the …
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X-band Doppler simulator for sport projectile radars
… the sport of golf using continuous wave (CW) X-band Doppler radars. Raw data was measured by a Doppler radar to determine the velocity profiles of golf balls in flight. From these profiles, flight models were developed that could be simulated using a Doppler simulator. An Arduino Due …
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A high speed digital, X-band phase shifter.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1965. M.S.
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NeXtRAD antenna design: X-Band dual polarised conical horn antenna
… design and implementation of a dual polarised X-band antenna. The desired specifications include a centre frequency of 8.5 GHzand a 10_ azimuth-half power beam width in both vertical and horizontal polarisations. Other requirements include peak power handling of 400 W over a 50 MHz instantaneous …
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X-band ENDOR and S-band ESEEM of paramagnetic disordered solids
X-band ENDOR and S-band ESEEM have been employed in this study to measure weak electron-nuclear hyperfine and nuclear electric quadrupole couplings in paramagnetic disordered solids. In the X-band ENDOR investigation, radicals generated from perylene adsorbed on catalytically active alumina and …
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An airborne X-band synthetic aperture radar receiver design and implementation
… focuses on the design and implementation of an X-band receiver for use in the South African Synthetic Aperture Radar (SASAR II) project. The SAR will be used to demonstrate the capability of building a high resolution X-hand imaging radar in South Africa. The design starts by investigating the …
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Integration, implementation and testing of the X-Band SASAR II system
… integration, implementation and testing of the X-Band (9.3 GHz) South African Synthetic Aperture Radar project (SASAR II). The SASAR II system was divided into three main subsystems for design and implementation at M.Sc. level. The three main systems were the transmitter and frequency distribution …
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X-band digitization systems aspects and filters for MeerKAT radio astronomy receiver
… by celestial sources at UHF-, L-, S- and X-band frequencies. With the development of the X-band receivers for MeerKAT scheduled to start in the near future, research is required to determine an optimum receiver design for this frequency band. There are two architecture options available for …
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Design optimization of broadband rape-based reflectary antena elements for x-band applications
… on analysis, design and optimization of broadband reflectarray antenna elements embedded on organic substrate materials. It addresses the key limitations of microstrip reflectarray antenna technology i.e., narrow bandwidth and high loss performance. It presents a novel dual resonance element …
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Design and implementation of L and X-band filters for the NeXtRAD front end
… research radar called NeXtRAD to suppress out of band transmitted and received signals. NeXtRAD is a multistatic pulse-Doppler radar system, developed at the University of Cape Town (UCT) in collaboration with the University College London (UCL). It has been designed to operate in two frequency …
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The study and real-time implementation of attenuation correction for X-band dual-polarization weather radars
… Recently, use of short range dual-polarization X-band radar systems has gained momentum due to lower system cost compared with the much more expensive S-band systems. Advances in dual-polarization radar research have shown that the specific attenuation and differential attenuation between …
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High power X-band RF test stand development and high power testing of the CLIC crab cavity
… and operation of multiple high power X-band RF test facilities for high gradient acceleration and deflecting structures at CERN, as re-quired for the e+ e- collider research programme CLIC (Compact Linear Collider). Signif-icant improvements to the control system and operation of the …
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Design and implementation of a X-band transmitter and frequency distribution unit for a synthetic aperture radar
… high quality images with a South African X-band demonstrator. This dissertation forms part of the project. It aims to describe the design and implementation of the transmitter and associated frequency distribution unit (FDU) for the SASAR II, X-band SAR. Although the transmitter and FDU are …
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The development and validation of an X-band dual polarization Doppler weather radar test node for a tropical network
An automated network of three X-band dual polarization Doppler weather radars is in process of being deployed and operational on the western coast of Puerto Rico. Colorado State University and the University of Puerto Rico at Mayaguez have collaborated to install the first polarimetric weather …
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A comparison of X-band polarization parameters with in-situ microphysical measurements in the comma head of two winter cyclones
… head of two cyclones as the Mobile Alabama X-band (MAX) dual-polarization radar performed range-height indicator scans in the same plane as the C-130 flight track. On 14-15 February and 21-22 February 2010, 579 and 202 coincident data points, respectively, were identified when the plane was …
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Bridging the gap : comparative analysis of a gap filling X-band radar QPE algorithms and their implications for nowcasting and hydrological modeling
… This research examines how a single X-Band radar bridges the gap in QPE estimation and its implications for hydrological modeling and nowcasting. Initially, a comparison between X-band and S-band radars with Integrated Multi-satellitE Retrievals for GPM (IMERG) showed comparable …
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Structure-Property Evaluation of the Dielectric Properties of Radar Absorbing Materials in Free Space
… the EM radiation is often radar, namely X-band. In order to understand the behavior of a composite material in X-band, several measurement techniques can be employed to evaluate dielectric properties. The use of Free Space and anechoic chamber instrumentation are two such ways to achieve …
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