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"Manley, Pat"
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The sailing bible : the complete guide for all sailors from novice to expert
\"Designed to be user-friendly and hands-on, this manual is packed with detailed step-by-step information, lively action photos, explanatory diagrams and helpful advice on getting the most out of your sailing.\"--Page 4 of cover.
Book
Collision Regulations – Discussion
I read the Forum article ‘Removal of an Ambiguity from the Maritime Collision
Regulations’ (Cooper, 2001) and make the following comments. As a Royal Yachting
Association Yachtmaster Instructor, I find that many people quote Rule 10 of the
COLREGS only in part and thus are misled by its intentions.
Journal Article
The sailing bible : the complete guide for all sailors from novice to expert
\"The Sailing Bible is a comprehensive handbook for all sailors, whatever their experience.\"-- Provided by publisher.
Book
Linden Honors Retiring Coach at Sports Banquet
Linden-McKinley Athletic Dir. Art Thompson honored retiring Coach George Shirley for 40 years of dedication at the school and presented him with a gift at the 1970 all-sports banquet at David's Buffet Monday, May 25.
Newspaper Article
Fuel For Thought Dirty fuel can at best be a nuisance and at worst cost you your boat, but regular maintenance can minimize the risk of any surprises
Dirty fuel can at best be a nuisance and at worst cost you your boat, but regular maintenance can minimize the risk of any surprises.
Magazine Article
Innovations in Social Work Research : using methods creatively
A valuable reference to help practising researchers not only to understand but also to apply innovative approaches to social work research. Featuring extended case studies of actual research projects, the book provides an overview of a number of central features and qualities of social work research. It incorporates both distinctive methodological features, such as approaches to participatory inquiry, and provides accounts of researcher strategies to address particular challenges, such as carrying out studies with hard to reach populations. This book combines important methodological insights with pragmatic guidance on commonly experienced problems and how these challenges can be overcome. This is a key resource for social work and social care students, social work practitioners and academics engaged in research.
eBook
New Limits on Polarized Power Spectra at 126 and 164 MHz: Relevance to Epoch of Reionization Measurements
Polarized foreground emission is a potential contaminant of attempts to measure the fluctuation power spectrum of highly redshifted 21 cm HI emission from the epoch of reionization. Using the Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER), we present limits on the observed power spectra of all four Stokes parameters in two frequency bands, centered at 126 MHz (\\(z=10.3\\)) and 164 MHz (\\(z=7.66\\)) for a three-month observing campaign of a 32-antenna deployment, for which unpolarized power spectrum results have been reported at \\(z=7.7\\) (Parsons et al 2014) and \\(7.5 < z < 10.5\\) (Jacobs et al 2014). The power spectra in this paper are processed in the same way as in those works, and show no definitive detection of polarized power. This non-detection appears to be largely due to the suppression of polarized power by ionospheric rotation measure fluctuations, which strongly affect Stokes Q and U. We are able to show that the net effect of polarized leakage is a negligible contribution at the levels of of the limits reported in Parsons et al 2014 and Jacobs et al 2014.
Paper
Multi-redshift limits on the 21cm power spectrum from PAPER
The epoch of reionization power spectrum is expected to evolve strongly with redshift, and it is this variation with cosmic history that will allow us to begin to place constraints on the physics of reionization. The primary obstacle to the measurement of the EoR power spectrum is bright foreground emission. We present an analysis of observations from the Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER) telescope which place new limits on the HI power spectrum over the redshift range of \\(7.5
Paper
New Limits on 21cm EoR From PAPER-32 Consistent with an X-Ray Heated IGM at z=7.7
We present new constraints on the 21cm Epoch of Reionization (EoR) power spectrum derived from 3 months of observing with a 32-antenna, dual-polarization deployment of the Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER) in South Africa. In this paper, we demonstrate the efficacy of the delay-spectrum approach to avoiding foregrounds, achieving over 8 orders of magnitude of foreground suppression (in \\(\\textrm{mK}^2\\)). Combining this approach with a procedure for removing off-diagonal covariances arising from instrumental systematics, we achieve a best 2-sigma upper limit of \\((41\\,\\textrm{mK})^2\\) for \\(k=0.27 h\\textrm{Mpc}^{-1}\\) at \\(z=7.7\\). This limit falls within an order of magnitude of the brighter predictions of the expected 21cm EoR signal level. Using the upper limits set by these measurements, we generate new constraints on the brightness temperature of 21cm emission in neutral regions for various reionization models. We show that for several ionization scenarios, our measurements are inconsistent with cold reionization. That is, heating of the neutral intergalactic medium (IGM) is necessary to remain consistent with the constraints we report. Hence, we have suggestive evidence that by \\(z=7.7\\), the HI has been warmed from its cold primordial state, probably by X-rays from high-mass X-ray binaries or mini-quasars. The strength of this evidence depends on the ionization state of the IGM, which we are not yet able to constrain. This result is consistent with standard predictions for how reionization might have proceeded.
Paper