Detector Characterization Analysis of the Initial Laser Interferometer Gravitational-Wave Observatory (LIGO) Using Principal Component Analysis (PCA)

The purpose of this thesis is to investigate transient noise events in data from the initial Laser Interferometer Gravitational-Wave Observatory (LIGO) and to test detector characterization software developed by the LIGO Scientific Collaboration (LSC). Detector characterization is the process of identifying and removing “noise” that corrupts the data stream of the LIGO detectors. This is vital to improving the sensitivity of the LIGO interferometer and increasing the probability of detecting gravitational waves of astrophysical origin. The data analyzed in this thesis were collected in 2010 during the S6 (Enhanced LIGO) science run. Two software tools, PCAT and Omega Scans, were used to analyze the data. PCAT (Principal Component Analysis for Transients) uses a technique based on Principal Component Analysis to identify and classify instrumental transient noise events (“glitches”). The Omega Scans software was used in the follow-up study of individual glitches to investigate their spectral properties. Two 8.5-hour long and one 16.5-hour long data stretches of S6 data were analyzed. Analysis of these data showed that PCAT correctly classifies glitches with an efficiency of about 60%

Kroeze, McLarty & Duddleston to Mr. Silver, 12 September 1962

Professional correspondenc

Facultative methanotrophy: false leads, true results, and suggestions for future research

Methanotrophs are a group of phylogenetically diverse microorganisms characterized by their ability to utilize methane as their sole source of carbon and energy. Early studies suggested that growth on methane could be stimulated with the addition of some small organic acids, but initial efforts to find facultative methanotrophs, i.e., methanotrophs able to utilize compounds with carbon–carbon bonds as sole growth substrates were inconclusive. Recently, however, facultative methanotrophs in the genera Methylocella , Methylocapsa , and Methylocystis have been reported that can grow on acetate, as well as on larger organic acids or ethanol for some species. All identified facultative methanotrophs group within the Alphaproteobacteria and utilize the serine cycle for carbon assimilation from formaldehyde. It is possible that facultative methanotrophs are able to convert acetate into intermediates of the serine cycle (e.g. malate and glyoxylate), because a variety of acetate assimilation pathways convert acetate into these compounds (e.g. the glyoxylate shunt of the tricarboxylic acid cycle, the ethylmalonyl‐CoA pathway, the citramalate cycle, and the methylaspartate cycle). In this review, we summarize the history of facultative methanotrophy, describe scenarios for the basis of facultative methanotrophy, and pose several topics for future research in this area.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/86841/1/fml2315.pd

San Carlos Saga

This item is part of the Arizona Land and People (formerly Progressive Agriculture in Arizona) archive. It was digitized from a physical copy provided by the College of Agriculture and Life Sciences at The University of Arizona. For more information about this periodical, please email CALS Publications at [email protected]

Aerial view of Main Library and Special Collections

Black and white photograph of an aerial view of the east side of Main Library and south side of Special Collections, with the streets south and east of Main Library shown

Application of 3D Printing to Microbiology and Human Anatomy

Application of 3D Printing to Microbiology and Human Anatomy. We have been exploring the use of 3D printing within the biological sciences in a two-part project

Looking west from Arizona stadium, February 1981

Black and white photograph of the University of Arizona campus and the city of Tucson, facing west from the Arizona stadium, with Mansfeld Middle School shown to the left and University garage in the center foreground. This is an exact copy of uaz_uap_views_1970s-1980s_f3_

Looking west from Arizona stadium, February 1981

Black and white photograph of The University of Arizona campus and the city of Tucson, facing west from the Arizona stadium, with Mansfeld Middle School shown to the left and University garage in the center foreground