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 374 for “"bursts"”.
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Gamma-ray bursts with MeerLICHT
… with MeerLICHT in which we followed-up 29 bursts, and three chapters presenting detailed studies on individual GRBs. The rst of these studies focuses on GRB 210731A. Starting 286 seconds post-trigger, MeerLICHT obtained a highly unusual light curve consisting of three peaks, which we …
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Bursts identification in water distribution systems
… be generalised to identify locations of multiple bursts.
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Statistical study of solar radio bursts
… to quantify the potential impact of radio bursts on wireless systems. Tables of fit parameters, which can be used to find burst occurrence rates in a number of frequency ranges, are presented. The typical power-law index of number density distribution, -1.8, is similar to that found in many …
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The nature of fast radio bursts
The origin of fast radio bursts (FRBs) is a major open question in the field of astrophysics. We propose that FRBs are produced by synchrotron maser emission (SME) that occurs as a result of non-resonant interactions between Alfv´en waves and relativistic plasma. We examine the results of such an …
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The radiation mechanism of fast radio bursts
Recent observations show that fast radio bursts (FRBs) are energetic but probably non-catastrophic events occurring at cosmological distances. The properties of their progenitors are largely unknown in spite of many attempts to determine them using the event rate, duration and energetics. …
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Mathematical methods for classifying fast radio bursts
The recent extragalactic discovery of Fast Radio Bursts (FRBs) has ignited a whirlwind of research, and numerous fundamental questions about them are being studied. This thesis delves into this field, aiming to bridge the gap in our exploration of FRB populations. The FRBs are cosmic transients …
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Millisecond oscillations during thermonuclear X-ray bursts
… trains detected in a search of 159 thermonuclear bursts from eight neutron star X-ray binaries observed with the Rossi X-ray Timing Explorer. I use all data that were public as of September 2001. The frequencies of the oscillations are uniformly distributed between 270-620 Hz, and are nearly …
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Precursors in Gamma-ray Bursts Observed by Fermi
Gamma-ray bursts (GRBs) are some of the most energetic explosions in the universe. They come from the core collapses of massive stars and the mergers of compact objects, and are observed as bright flashes of gamma rays (prompt emission) followed by long-lived, fading emission (afterglow) across the …
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Teilchenbeschleunigung an ultrarelativistischen Stoßfronten und Gamma-Ray Bursts
… Stoßfronten dieser Art werden in Gamma-Ray Bursts vermutet, kurzen Ausbrüchen von Gamma-Strahlung, die die leuchtstärksten Objekte im Universum sind und nicht-thermische Spektra aufweisen. Die Teilchenverteilungsfunktion für den Beschleunigungsprozeß wird mit einer weiterentwickelten …
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Correction of Single and Multiple Bursts of Errors
Made available in DSpace on 2014-12-08T22:24:34Z (GMT). No. of bitstreams: 1 6915269.pdf: 1835078 bytes, checksum: 398370aaa08d7b88491817fb6d4bf188 (MD5) Previous issue date: 1969
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Searching for an optical counterpart to Fast Radio Bursts
Fast radio bursts (FRBs) are bright, short-lived bursts of radio emission of extragalactic origins. Despite being immensely luminous, the answer to what actually causes FRBs remains a mystery. Numerous models have been proposed, but it is difficult to narrow down the list because, up until now, …
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Determining the jet opening-angle of gamma-ray bursts
… agreement that at least some cosmic gamma-ray bursts (GRBs) coincide with the deaths of rapidly rotating massive stars - dubbed "hyper-novae." In 1987, a supernova (SN 1987A) was detected in the Large Magellanic Cloud - its progenitor was a blue, rapidly rotating supergiant that was probably a …
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ON THE SPECTRA OF GAMMA-RAY BURSTS AT HIGH ENERGIES
… Mission satellite (SMM) observed 71 gamma-ray bursts. These events form a representative subset of the class of classical gamma-ray bursts. Since their discovery more than 15 years ago, hundreds of gamma-ray bursts have been detected; however, most observations have been limited to an energy …
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Testing and improving the luminosity relations for Gamma-Ray Bursts
Gamma Ray Bursts (GRBs) have several luminosity relations where a measurable property of a burst light curve or spectrum is correlated with the burst luminosity. These luminosity relations are calibrated for the fraction of bursts with spectroscopic redshifts and hence the known luminosities. GRBs …
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Heterogenous Change in Neuronal Bursts Following Recovery from Activity Silencing
… from silencing were more heterogeneous during bursts, which is in contrast to the current perception that bursting activity is a homogeneous event. It was also observed that there were more active neurons during the recovery period. It is hypothesized that these changes in neuronal system …
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Computational analysis techniques using fast radio bursts to probe astrophysics
This thesis focuses on Fast Radio Bursts (FRBs) and presents computational techniques that can be used to understand these enigmatic events and the Universe around them. Chapter 1 provides a theoretical overview of FRBs; providing a foundation for the chapters that follow. Chapter 2 details current …
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Cosmic string cusps and their application to fast radio bursts
… power, rate, and time scale of any radiation bursts. The second is consideration of wiggly cosmic strings. Simulations imply a distribution of strings in an expanding universe develop small-scale structure called wiggles. We extend on a wiggly Polyakov formalism and show that wiggles prohibit …
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Probing the Diversity of Fast Radio Bursts with CHIME/FRB
Fast radio bursts (FRBs) are extremely bright extragalactic radio transients that flash for microseconds to milliseconds at a time, most never to repeat again. Encoded in every observed FRB is information from burst propagation effects, giving us clues about their mysterious origins as well as the …
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Determining the jet opening angle of cosmic gamma-ray bursts
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2005.
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