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.
Results
Showing 1 to 11 of 11 for “"GBT"”.
-
Time Blanking for GBT Data with RADAR RFI
The 1215 MHz to 1400 MHz band is important for radio astronomers to observe redshifted extragalactic hydrogen ionic (HI). Observations at these frequencies are complicated by radio frequency interference (RFI) from strong man-made transmissions such as the ARSR-3 Air Surveillance Radar. In this …
-
Interactive Buckling and Post-Buckling Studies of Thin-Walled Structural Members with Generalized Beam Theory
… methodology for Generalized Beam Theory (GBT) elastic buckling analysis on members with holes, where the buckling modes of gross cross-section interact with those of net cross-section. The approach treats member with holes as a structural system consisting of prismatic sub-members. These …
-
Stability analysis of light gauge steel members using the finite element method and the generalized beam theory
… conditions. The Generalized Beam Theory (GBT) with the facilities of elastic spring restraints, buckling under coupled loads, different load locations has been developed and programmed by the author. It has been applied to reveal the basic behaviour and the interaction between the modes of …
-
The use of generalized beam theory, finite elements and experimental testing to investigate the stability of light gauge steel sections subject to axial load
… study focuses on the Generalized Beam Theory (GBT) using the Finite Difference method for solution with a view to developing models using MATLAB to predict buckling loads, buckling mode shapes and non-linear yielding loads of members subjected to axial load for different boundary conditions. …
-
Analysis and Application of Automated Methods for Detecting Pulsars in the Green Bank Telescope 350MHz Drift-Scan Survey
… 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, C4.5 (J48) Decision …
-
Deep HI observations of nearby late-type galaxies
… and in the nearby M81 group. Using the KAT-7, GBT and MeerKAT AR1 telescopes, we present in the second chapter a survey of the Hi in a sample of twenty nearby, mostly isolated galaxies down to low column density levels. This provided a new Hi view of some of these galaxies, which allowed to …
-
Deep HI observations of nearby late-type galaxies
… and in the nearby M81 group. Using the KAT-7, GBT and MeerKAT AR1 telescopes, we present in the second chapter a survey of the Hi in a sample of twenty nearby, mostly isolated galaxies down to low column density levels. This provided a new Hi view of some of these galaxies, which allowed to …
-
Interstellar Gas Clouds and Gen. Ed. Astronomy Students: Who Are They? How Do They Behave?
… maser, and CCS emission simultaneously with the GBT. We find the NH₃ gas traces the 1.1 mm BGPS structure very well with gas kinetic temperatures consistently close to 15 K. Typical column densities are 2.5 × 10¹⁴ cm⁻² with a median abundance of NH₃ to H₂ of 5.94 × 10⁻⁸. The median linewidth of …
-
Observational study of the role of magnetic fields in star formation
… 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 < 1. This is …
-
Sampling the Radio Transient Universe: Studies of Pulsars and the Search for Extraterrestrial Intelligence
… pulsar surveys of the region.;The Versatile GBT Astronomical Spectrometer (VEGAS) is a heterogeneous instrument 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 …
-
Real-time Adaptive Cancellation of Satellite Interference in Radio Astronomy
Radio astronomy is the science of observing the heavens at radio frequencies, from a few kHz to approximately 300 GHz. In recent years, radio astronomy has faced a growing interference problem as radio frequency (RF) bandwidth has become an increasingly scarce commodity. A programmable real-time …