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15 research outputs found

Apercal-The Apertif calibration pipeline

Author: Adams E.K.
Adebahr B.
Connor L.D.
Coolen A.H.W.M.
Damstra S.
de Blok W.J.G.
Denes H.
Dijkema T.J.
Frank B.S.
Hess K.M.
Ivashina M.V.
Kutkin A.
Loose G.M.
Lucero D.
Maan Y.
Maccagni F.M.
Mika A.
Morganti R.
Moss V.A.
Mulder H.
Offringa A.R.
Oosterloo T.
Oostrum L.C.
Orrú E.
Pisano D.-J.
Schulz R.
Smits R.
van Cappellen W.A.
van der Hulst J.M.
van der Schuur D.
van Leeuwen J.
Verstappen J.
Vilchez N.P.E.
Vohl D.
Wijnholds S.J.
Ziemke J.
Publication venue: 'Elsevier BV'
Publication date: 01/01/2022
Field of study

Apertif (APERture Tile In Focus) is one of the Square Kilometre Array (SKA) pathfinder facilities. The Apertif project is an upgrade to the 50-year-old Westerbork Synthesis Radio Telescope (WSRT) using phased-array feed technology. The new receivers create 40 individual beams on the sky, achieving an instantaneous sky coverage of 6.5 square degrees. The primary goal of the Apertif Imaging Survey is to perform a wide survey of 3500 square degrees (AWES) and a medium deep survey of 350 square degrees (AMES) of neutral atomic hydrogen (up to a redshift of 0.26), radio continuum emission and polarisation. Each survey pointing yields 4.6 TB of correlated data. The goal of Apercal is to process this data and fully automatically generate science ready data products for the astronomical community while keeping up with the survey observations. We make use of common astronomical software packages in combination with Python based routines and parallelisation. We use an object oriented module-based approach to ensure easy adaptation of the pipeline. A Jupyter notebook based framework allows user interaction and execution of individual modules as well as a full automatic processing of a complete survey observation. If nothing interrupts processing, we are able to reduce a single pointing survey observation on our five node cluster with 24 physical cores and 256 GB of memory each within 24 h keeping up with the speed of the surveys. The quality of the generated images is sufficient for scientific usage for 44% of the recorded data products with single images reaching dynamic ranges of several thousands. Future improvements will increase this percentage to over 80%. Our design allowed development of the pipeline in parallel to the commissioning of the Apertif system

Chalmers Research

International Migration, Integration and Social Cohesion online publications

ATLAS detector and physics performance: Technical Design Report, 1

Author: Abdinov O.B.
Abolins M.
Abramowicz H.
Acerbi E.
Ackermann K.
Ackers M.
Aderholz M.
Ahlen S.
Aielli G.
Airapetian A.
Akerman D.
Akesson T.
Akhmedov A.
Akhoundov A.
Akimov A.
Alam S.
Aleksa M.
Aleppo M.
Alessandria F.
Alexa C.
Alexander G.
Alexandrov I.
Alexeev G.
Alforque S.
Alikov B.
Allport P.P.
Almehed S.
Aloisio A.
Alviggi M.G.
Amadon A.
Amako K.
Amaral P.
Ambrosini G.
Amelin D.V.
Ammosov V.V.
Amorim A.
Anderson B.
Anderson K.
Anderssen E.
Andre F.
Andreazza A.
Andricek L.
Andrieux M.L.
Anghinolfi F.
Anosov V.
Antipov Yu.M.
Apsimon R.J.
Arai Y.
Arik E.
Armitage J.
Armstrong W.W.
Arnaud C.
Arnault C.
Arsenescu R.
Artamonov A.
Asai M.
Assamagan K.A.
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Astvatsaturov A.
Atag A.
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Auge E.
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Ayad R.
Azhgirei L.
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Baker O.K.
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Zverev E.G.
Fasssouliotis D.
Publication venue: Union of Concerned Scientists
Publication date: 01/01/1999
Field of study

CERN Document Server

Systematic effects in LOFAR data: A unified calibration strategy

Author: Brüggen M.
Callingham J.R.
de Gasperin F.
Dijkema T.J.
Drabent A.
Emig K.L.
Heald G.
Intema H.T.
Mevius M.
Morabito L.K.
Offringa A.R.
Oonk R.
Orrù E.
Rafferty D.
Röttgering H.
Sabater J.
Shimwell T.
Shulevski A.
van Weeren R.
Williams W.
Publication venue: EDP Sciences
Publication date: 19/11/2018
Field of study

Context: New generation low-frequency telescopes are exploring a new parameter space in terms of depth and resolution. The data taken with these interferometers, for example with the LOw Frequency ARray (LOFAR), are often calibrated in a low signal-to-noise ratio regime and the removal of critical systematic effects is challenging. The process requires an understanding of their origin and properties. Aim. In this paper we describe the major systematic effects inherent to next generation low-frequency telescopes, such as LOFAR. With this knowledge, we introduce a data processing pipeline that is able to isolate and correct these systematic effects. The pipeline will be used to calibrate calibrator observations as the first step of a full data reduction process. Methods. We processed two LOFAR observations of the calibrator 3C 196: the first using the Low Band Antenna (LBA) system at 42-66 MHz and the second using the High Band Antenna (HBA) system at 115-189 MHz. Results. We were able to isolate and correct for the effects of clock drift, polarisation misalignment, ionospheric delay, Faraday rotation, ionospheric scintillation, beam shape, and bandpass. The designed calibration strategy produced the deepest image to date at 54 MHz. The image has been used to confirm that the spectral energy distribution of the average radio source population tends to flatten at low frequencies. Conclusions. We prove that LOFAR systematic effects can be described by a relatively small number of parameters. Furthermore, the identification of these parameters is fundamental to reducing the degrees of freedom when the calibration is carried out on fields that are not dominated by a strong calibrator.</p

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Dissertations of the University of Groningen

Marsh surface sediment deposition and the role of tidal creeks: Implications for created and managed coastal marshes

Author: A.H. Brampton
A.L. Murray
A.R. Orme
Anne L. Murray
C.-H. Chung
D.J. Reed
D.J. Reed
D.J. Reed
D.J. Reed
D.J. Reed
D.J. Reed
D.M. Burdick
D.R. Cahoon
D.R. Stoddart
Denise J. Reed
F. Burd
F. Burd
I. Moeller
J. Haltiner
J. Haltiner
J.A. Miller
J.A. Steers
J.R. French
J.R. French
J.R. French
J.R. French
J.R. French
J.R. French
J.R.L. Allen
J.S. Pethick
J.S. Pethick
J.S. Pethick
J.T. Wells
J.W. Portnoy
Jonathan R. French
K.S. Dijkema
L.A. Leonard
L.A. Leonard
L.A. Leonard
Lynn Leonard
M.K. El-Sayed
P. Adam
P.B. Williams
R. Stumpf
R.H. Baumann
R.H.C. Emmerson
R.W. Frey
T.P. Bayliss-Smith
Thomas Spencer
Publication venue: 'Springer Science and Business Media LLC'
Publication date
Field of study

Crossref

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Brussel J.P. van
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Burger D.H.
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Butter G. den
Cancrinus E.
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Lind R.C.
Linden F.T. van der
Loos M.J.
Loubert M.C.
Lung P.F.L.
Mahmoud D.E.
Manshanden C.G.
Mattens E.C.
Meerwaldt R.
Mees B.M.
Metz R.
Minnee R.C.
Mol van Otterloo J.C. de
Moll F.L.
Morak M.J.
Mortel R.H. van de
Mulder W.
Nagesser S.K.
Naves C.C.
Nederhoed J.H.
Nevenzel-Putters A.M.
Nie A.J. de
Nieuwen-Huizen J.
Nieuwenhuis D.H.
Nieuwenhuizen R.C. van
Nio D.
Nolthenius R.P.T.
Oomen A.P.
Oranen B.I.
Oskam J.
Palamba H.W.
Peppelenbosch A.G.
Petersen A.S. van
Peterson T.F.
Petri B.J.
Pierie M.E.
Ploeg A.J.
Pol R.A.
Ponfoort E.D.
Poyck P.P.
Prent A.
Raa S. ten
Raymakers J.T.
Reichart M.
Reichmann B.L.
Reijnen M.M.
Rijbroek A.
Rijn M.J. van
Roo R.A. de
Rouwet E.V.
Rupert C.G.
Saleem B.R.
Sambeek M.R. van
Samyn M.G.
Sant H.P. van 't
Schaik J. van
Schaik P.M. van
Scharn D.M.
Scheltinga M.R.
Schepers A.
Schlejen P.M.
Schlosser F.J.
Schol F.P.
Schouten O.
Schreinemacher M.H.
Schreve M.A.
Schurink G.W.
Sikkink C.J.
Siroen M.P.
Slaa A. te
Smeets H.J.
Smeets L.
Smet A.A. de
Smit P. de
Smit P.C.
Smits T.M.
Snoeijs M.G.
Sondakh A.O.
Steenhoven T.J. van der
Sterkenburg S.M. van
Stigter D.A.
Stigter H.
Strating R.P.
Stultiens G.N.
Swijndregt Y.C.M. van
Sybrandy J.E.
Teijink J.A.
Telgenkamp B.J.
Testroote M.J.
The R.M.
Thijsse W.J.
Tielliu I.F.
Tong T.M.L.
Tongeren R.B. van
Toorop R.J.
Tordoir J.H.
Tournoij E.
Truijers M.
Turkean K.
Unlu C.
Vafi A.A.
Vahl A.
Vahl A.C.
Veen E.J.
Veger H.T.
Veldman M.G.
Verhagen H.J.
Verhoeven B.A.
Vermeulen C.F.
Vermeulen E.G.
Vierhout B.P.
Visser M.J.
Vliet J.A. van der
Vlijmen-van Kuelen C.J.
Voesten H.G.
Voorhoeve R.
Vos
Publication venue: 'Ovid Technologies (Wolters Kluwer Health)'
Publication date: 01/11/2019
Field of study

Objective: The aim of this was to analyze differences between saccularshaped abdominal aortic aneurysms (SaAAAs) and fusiform abdominal aortic aneurysms (FuAAAs) regarding patient characteristics, treatment, and outcome, to advise a threshold for intervention for SaAAAs.Background: Based on the assumption that SaAAAs are more prone to rupture, guidelines suggest early elective treatment. However, little is known about the natural history of SaAAAs and the threshold for intervention is not substantiated.Methods: Observational study including primary repairs of degenerative AAAs in the Netherlands between 2016 and 2018 in which the shape was registered, registered in the Dutch Surgical Aneurysm Audit (DSAA). Patients were stratified by urgency of surgery; elective versus acute (symptomatic/ruptured). Patient characteristics, treatment, and outcome were compared between SaAAAs and FuAAAs.Results: A total of 7659 primary AAA-patients were included, 6.1% (n = 471) SaAAAs and 93.9% (n = 7188) FuAAAs. There were 5945 elective patients (6.5% SaAAA) and 1714 acute (4.8% SaAAA). Acute SaAAApatients were more often female (28.9% vs 17.2%, P = 0.007) compared with acute FuAAA-patients. SaAAAs had smaller diameters than FuAAAs, in elective (53.0mm vs 61 mm, P = 0.000) and acute (68mm vs 75 mm, P = 0.002) patients, even after adjusting for sex. In addition, 25.2% of acute SaAAA-patients presented with diameters <55mm and 8.4% <45 mm, versus 8.1% and 0.6% of acute FuAAA-patients (P = 0.000). Postoperative outcomes did not significantly differ between shapes in both elective and acute patients.Conclusions: SaAAAs become acute at smaller diameters than FuAAAs in DSAA patients. This study therefore supports the current idea that SaAAAs should be electively treated at smaller diameters than FuAAAs. The exact diameter threshold for elective treatment of SaAAAs is difficult to determine, but a diameter of 45mm seems to be an acceptable threshold.Vascular Surger

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