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 16 of 16 for “"Green Bank"”.
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Analysis and Application of Automated Methods for Detecting Pulsars in the Green Bank Telescope 350MHz Drift-Scan Survey
… National Radio Astronomy Observatory's (NRAO's) Green Bank Telescope (GBT) in 2007, this thesis explores the application of machine learning techniques to mitigate the manual efforts involved in pulsar candidate detection. The performance of three different classifiers is explored - Naive Bayes, …
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Building Blocks of a Just Transition: Green Banks and Residential Building Decarbonization in New York
… away from fossil fuels and towards clean energy. Green banks are one such solution as a specialty finance vehicle aimed at using public funds to induce private investment in climate energy projects such as residential building decarbonization. Given the recent increased investment and policy …
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Nineteen-Element Phased-Array Feed Development and Analysis on Effects of Focal Plane Offset and Beam Steering on Sensitivity
… National Radio Astronomy Observatory (NRAO) in Green Bank West Virginia for use on the Green Bank 20-Meter Telescope. Numerical simulations were performed to determine how sensitivity was affected by electronic beam steering and offset of the phased array feed (PAF) relative to the focal plane …
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Synthesis of dual offset Gregorian reflector antennas with very low cross polarization under practical constraints for mass production
… largest steerable reflector in the world, the Green Bank Radio Telescope located in Green Bank, West Virginia. Finally, an overview of the various analytical and numerical methods employed in the analysis of reflector antennas is presented in the appendices. The philosophical differences …
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Characterization of a Phased Array Feed Model
… Experiments were performed at the NRAO site in Green Bank, West Virginia, and utilized the outdoor antenna test range and 20 meter radio telescope. Accurate modeling of the PAF requires modeling the signal and noise characteristics of the array, which is a computationally large problem. It also …
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Time Blanking for GBT Data with RADAR RFI
… National Radio Astronomy Observatory (NRAO) at Green Bank, West Virginia, USA, where this RADAR system causes significant data corruption. Using this data, we present a blanking technique to separate RFI from cosmic signal. There are generally two blanking approaches, time window blanking and …
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Real-time Adaptive Cancellation of Satellite Interference in Radio Astronomy
… both an experimental platform at BYU, and the Green Bank Telescope at the National Radio Astronomy Observatory in West Virginia. A performance analysis of this cancellation system in the radio astronomy radio frequency interference (RFI) mitigation regime constitutes the main contribution of …
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From Large-scale Molecular Clouds to Filaments and Cores : Unveiling the Role of the Magnetic Fields in Star Formation
… of the nonthermal velocity dispersion from the Green Bank Ammonia survey (GAS) of the L1688 region of the Ophiuchus molecular cloud along with the column density map to determine magnetic field strength profile across dense cores. By applying the CFS method we find that for most cores in …
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Controlling for the Ionospheric and Baseline-Offset Uncertainties in the CHIME/FRB Outriggers VLBI Network for Milliarcsecond Precision
… CHIME/FRB VLBI Outrigger station located at the Green Bank Observatory (GBO) in West Virginia. This includes measuring and validating GBO's exact position to enable the localization of FRBs to sub-arcsecond precision. For VLBI networks spanning thousands of kilometers, the difference in the local …
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Sampling the Radio Transient Universe: Studies of Pulsars and the Search for Extraterrestrial Intelligence
… used mainly for pulsar studies with the Green Bank Telescope. I describe our work on the GPU spectrometer that we developed as part of VEGAS. The GPU code supports a dual-polarization bandwidth of up to 600 MHz.;In the field of SETI, I discuss two works. SERENDIP VI is a heterogeneous …
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Multiple Velocity Component Analysis of Ammonia Spectral Lines in High-Mass Star-Forming Regions
… of ammonia (NH3) gas observations from a Green Bank Telescope large program covering 11 giant molecular clouds (GMCs). To this end we extended existing codes to enable simultaneous fitting of up to three velocity components with radiative transfer. Using our multiple component fitting …
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A Prototype Platform for Array Feed Development
… for the National Radio Astronomy Observatory in Green Bank, West Virginia. The array feed was demonstrated on a three-meter parabolic reflector by recovering a weak signal of interest that was obscured by a strong, broadband interferer. Similar results were also obtained when the interferer moved …
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A search for fast pulsars in globular clusters
… of the recently begun S-band survey using the Green Bank telescope. I have analyzed and conducted acceleration searches on 70% of the data and discovered 7 of the 23 new millisecond pulsars reported in this work. One year of timing observations of the pulsars in M28 and NGC6440 has led to the …
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Observational study of the role of magnetic fields in star formation
… to trace higher density regions. Using the Green Bank Telescope (GBT) we mapped the magnetic fields of cores and envelopes of dark cloud cores using OH as a tracer molecule. From this, the ratio of M/$\Phi$ between the cores and envelopes were computed, and were consistently determined to be …
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Multiwavelength Studies of Rotating Radio Transients
… simultaneous observations at 1--2 GHz with the Green Bank, Effelsberg, and Parkes telescopes, respectively. Both the detected X-ray photons and radio pulses appear to be randomly distributed in time. We find tentative evidence for a correlation between the detected radio pulses and X-ray photons …
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Probes of pulsar emission physics: The double pulsar and the gamma-ray pulsar population
… 2.8 s pulsar (pulsar B) based on five years of Green Bank Telescope data since 2003 December. We find that the pulse profile and the flux density of pulsar B change significantly over time, culminating in its radio emission disappearance towards our line of sight since 2008 March. Over this …