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The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis
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- Zheng Zhang, Jonathan C. Pober, Wenyang Li, Bryna J. Hazelton, Miguel F. Morales, Cathryn M. Trott, Christopher H. Jordan, Ronniy C. Joseph, Adam Beardsley, Nichole Barry, Ruby Byrne, Steven J. Tingay, Aman Chokshi, Kenji Hasegawa, Daniel C. Jacobs, Adam Lanman, Jack L. B. Line, Christene Lynch, Benjamin McKinley, Daniel A. Mitchell, Steven Murray, Bart Pindor, Mahsa Rahimi, Keitaro Takahashi, Randall B. Wayth, Rachel L. Webster, Michael Wilensky, Shintaro Yoshiura, Qian Zheng
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- Publications of the Astronomical Society of Australia / Volume 37 / 2020
- Published online by Cambridge University Press:
- 04 November 2020, e045
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Precise instrumental calibration is of crucial importance to 21-cm cosmology experiments. The Murchison Widefield Array’s (MWA) Phase II compact configuration offers us opportunities for both redundant calibration and sky-based calibration algorithms; using the two in tandem is a potential approach to mitigate calibration errors caused by inaccurate sky models. The MWA Epoch of Reionization (EoR) experiment targets three patches of the sky (dubbed EoR0, EoR1, and EoR2) with deep observations. Previous work in Li et al. (2018) and (2019) studied the effect of tandem calibration on the EoR0 field and found that it yielded no significant improvement in the power spectrum (PS) over sky-based calibration alone. In this work, we apply similar techniques to the EoR1 field and find a distinct result: the improvements in the PS from tandem calibration are significant. To understand this result, we analyse both the calibration solutions themselves and the effects on the PS over three nights of EoR1 observations. We conclude that the presence of the bright radio galaxy Fornax A in EoR1 degrades the performance of sky-based calibration, which in turn enables redundant calibration to have a larger impact. These results suggest that redundant calibration can indeed mitigate some level of model incompleteness error.
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- By Rose Teteki Abbey, K. C. Abraham, David Tuesday Adamo, LeRoy H. Aden, Efrain Agosto, Victor Aguilan, Gillian T. W. Ahlgren, Charanjit Kaur AjitSingh, Dorothy B E A Akoto, Giuseppe Alberigo, Daniel E. Albrecht, Ruth Albrecht, Daniel O. Aleshire, Urs Altermatt, Anand Amaladass, Michael Amaladoss, James N. Amanze, Lesley G. Anderson, Thomas C. Anderson, Victor Anderson, Hope S. Antone, María Pilar Aquino, Paula Arai, Victorio Araya Guillén, S. Wesley Ariarajah, Ellen T. Armour, Brett Gregory Armstrong, Atsuhiro Asano, Naim Stifan Ateek, Mahmoud Ayoub, John Alembillah Azumah, Mercedes L. García Bachmann, Irena Backus, J. Wayne Baker, Mieke Bal, Lewis V. Baldwin, William Barbieri, António Barbosa da Silva, David Basinger, Bolaji Olukemi Bateye, Oswald Bayer, Daniel H. Bays, Rosalie Beck, Nancy Elizabeth Bedford, Guy-Thomas Bedouelle, Chorbishop Seely Beggiani, Wolfgang Behringer, Christopher M. Bellitto, Byard Bennett, Harold V. Bennett, Teresa Berger, Miguel A. Bernad, Henley Bernard, Alan E. Bernstein, Jon L. Berquist, Johannes Beutler, Ana María Bidegain, Matthew P. Binkewicz, Jennifer Bird, Joseph Blenkinsopp, Dmytro Bondarenko, Paulo Bonfatti, Riet en Pim Bons-Storm, Jessica A. Boon, Marcus J. Borg, Mark Bosco, Peter C. Bouteneff, François Bovon, William D. Bowman, Paul S. Boyer, David Brakke, Richard E. Brantley, Marcus Braybrooke, Ian Breward, Ênio José da Costa Brito, Jewel Spears Brooker, Johannes Brosseder, Nicholas Canfield Read Brown, Robert F. Brown, Pamela K. Brubaker, Walter Brueggemann, Bishop Colin O. Buchanan, Stanley M. Burgess, Amy Nelson Burnett, J. Patout Burns, David B. Burrell, David Buttrick, James P. Byrd, Lavinia Byrne, Gerado Caetano, Marcos Caldas, Alkiviadis Calivas, William J. Callahan, Salvatore Calomino, Euan K. Cameron, William S. Campbell, Marcelo Ayres Camurça, Daniel F. Caner, Paul E. Capetz, Carlos F. Cardoza-Orlandi, Patrick W. Carey, Barbara Carvill, Hal Cauthron, Subhadra Mitra Channa, Mark D. 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Yee, Viktor Yelensky, Yeo Khiok-Khng, Gustav K. K. Yeung, Angela Yiu, Amos Yong, Yong Ting Jin, You Bin, Youhanna Nessim Youssef, Eliana Yunes, Robert Michael Zaller, Valarie H. Ziegler, Barbara Brown Zikmund, Joyce Ann Zimmerman, Aurora Zlotnik, Zhuo Xinping
- Edited by Daniel Patte, Vanderbilt University, Tennessee
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- The Cambridge Dictionary of Christianity
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- 05 August 2012
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- 20 September 2010, pp xi-xliv
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Neolithic Causewayed Enclosures and Later Prehistoric Farming: Duality, Imposition and the Role of Predecessors at Kingsborough, Isle of Sheppey, Kent, UK
- Michael J. Allen, Matt Leivers, Chris Ellis, Simon Stevens, Susan Clelland, Alex Bayliss, Chris Butler, Rowena Gale, Alex Gibson, Jacqueline I. McKinley, Stephanie Knight, Lorraine Mepham, Robert Scaife, Chris J. Stevens
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- Proceedings of the Prehistoric Society / Volume 74 / 2008
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- 18 February 2014, pp. 235-322
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- 2008
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Developer-funded archaeology on the Isle of Sheppey resulted in the discovery of not one but two Neolithic causewayed enclosures on the same hilltop in very close (c. 300 m) proximity. In the later Bronze Age enclosures and cremation cemeteries were constructed immediately to the east, followed by Iron Age enclosures and, ultimately, field systems dating to the later Iron Age onwards.
A radiocarbon programme enabled the chronological sequence and hiatus between all of these events to be discerned, but the majority of this paper explores the physical, chronological, and social relationship between the two Neolithic causewayed enclosures. These were of different forms and, although on the same hilltop, they each seem to have had distinctly different viewsheds over the Thames and the Swale respectively. There are subtle, but potentially significant, differences in the material culture and deposition which allow exploration of the possible functions and role(s) of the two largely contemporaneous sites. Questions may be addressed such as whether they performed the same functions for two communities or had separate and distinct roles for a single community. Beyond the Neolithic, the paper also explores the nature of the later use of the hilltop. The Bronze Age enclosures, though agricultural in function, clearly seem to respect their Neolithic predecessors invoking a remembrance of space, which is lost by the Iron Age. The shift away from the special function of this landscape in the Neolithic to a subsequent agricultural use is explored, as is the hiatus in use and subsequent re-use of the area.
Eckert Animal Physiology: Mechanisms and Adaptations, 4th edn. By D. Randall, W. Burggren and K. French. Pp. 723. W. H. Freeman and Company, 1997. £28.95 hardback. ISBN 0 716 6724146.
- MICHAEL J. McKINLEY
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- Experimental Physiology / Volume 83 / Issue 4 / July 1998
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- 03 January 2001, pp. 571-572
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- July 1998
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I am still puzzling over such questions as to what is the largest object caught in a spider's web and what are the limitations to building larger webs? Or, what might be the selective forces that have operated on the evolution of aglomerular kidneys that has occurred in a few marine teleost species? These are just a couple of the thought-provoking questions that are posed liberally throughout the latest (4th) edition of Eckert's Animal Physiology that has been revised by Randall, Burggren and French. For those students and teachers who found the earlier editions of this book instructional and a valuable resource, its extensive revision and expansion will be received with enthusiasm. The authors have produced an excellent textbook of animal physiology. The animal kingdom is so diverse, one wonders how such a book can be confined to 700 pages. The aim of the authors has been to carefully elucidate the general physiological principles and physico-chemical laws which govern all forms of animal life and then to illustrate these laws with examples of adaptations drawn from a wide range of organisms. This aim has been largely fulfilled and the authors are to be congratulated on their revision.