A New Neutron Radiography / Tomography / Imaging Station DINGO at OPAL

Garbe, Ulf; Randall, T. J.; Hughes, Charles P.; Davidson, Gene; Pangelis, S.; Kennedy, S.J.

doi:10.1016/j.phpro.2015.07.003

Cited by 75 publications

(60 citation statements)

References 13 publications

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“…Non-destructive tomographic investigation was conducted using the DINGO thermal-neutron tomography facility located at the Australian Nuclear Science and Technology Organisation (ANSTO), Sydney, Australia [16]. Neutron tomography was conducted with a field of view of 200 × 200 mm 2 , yielding a reconstruction with cubic voxels of 95.2 µm × 95.2 µm × 95.2 µm.…”

Section: Methodsmentioning

confidence: 99%

First Complete Wing of a Stem Group Sphenisciform from the Paleocene of New Zealand Sheds Light on the Evolution of the Penguin Flipper

Mayr

Pietri

Love³

et al. 2020

Diversity

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We describe a partial skeleton of a stem group penguin from the Waipara Greensand in New Zealand, which is tentatively assigned to Muriwaimanu tuatahi. The fossil includes the first complete wing of a Paleocene penguin and informs on previously unknown features of the mandible and tibiotarsus of small-sized Sphenisciformes from the Waipara Greensand. The wing is distinguished by important features from that of all geologically younger Sphenisciformes and documents an early stage in the evolution of wing-propelled diving in penguins. In particular, the wing of the new fossil exhibits a well-developed alular phalanx and the distal phalanges are not flattened. Because the wing phalanges resemble those of volant birds, we consider it likely that the wing feathers remained differentiated into functional categories and were not short and scale-like as they are in extant penguins. Even though the flippers of geologically younger penguins may favor survival in extremely cold climates, they are likely to have been shaped by hydrodynamic demands. Possible selective drivers include a diminished importance of the hindlimbs in subaquatic propulsion, new foraging strategies (the caudal end of the mandible of the new fossil distinctly differs from that of extant penguins), or increased predation by marine mammals.

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Section: Methodsmentioning

confidence: 99%

First Complete Wing of a Stem Group Sphenisciform from the Paleocene of New Zealand Sheds Light on the Evolution of the Penguin Flipper

Mayr

Pietri

Love³

et al. 2020

Diversity

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“…As demonstrated in [4], by detecting and evaluating structural features, relevant information on the manufacturing process can be inferred. The neutron tomography analysis was performed on DINGO, the ACNS 1 neutron imaging instrument located on a thermal beam tangentially facing the 20MW OPAL research reactor at ANSTO 2 , Sydney [12].…”

Section: Methodsmentioning

confidence: 99%

A Neutron Tomographic Analysis of Plated Silver Coins from Ancient Greece Official or Illegal?

Olsen

Silvemini

Luzin

et al. 2020

Neutron Radiography - WCNR-11

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“…This study utilized the DINGO neutron radiography/ tomography/imaging station (Garbe et al, 2011(Garbe et al, , 2015, located on the thermal HB 2 beam, tangentially facing the 20 MW Open-Pool Australian Lightwater (OPAL) reactor housed at the Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, New South Wales, Australia to non-invasively image this specimen.…”

Section: Methodsmentioning

confidence: 99%

“…The DINGO facility utilizes a quasi-parallel collimated beam of thermal neutrons from OPAL with a maximum spectrum intensity at 1.08 Å (70 meV) and full-width-at-half-maximum (FWHM) of 0.9 Å (100 meV). For this study, a collimation ratio (L/D) of 1000 (Garbe et al, 2011(Garbe et al, , 2015 was used to ensure highest available spatial resolution, where L is the neutron apertureto-sample length and D is the neutron aperture diameter. The field of view was set to 100 × 100 mm 2 and scan time was 14 h with a voxel size of 45.5 × 45.5 × 45.5 µm.…”

Section: Methodsmentioning

confidence: 99%

A Juvenile Specimen of the Trematopid Acheloma From Richards Spur, Oklahoma and Challenges of Trematopid Ontogeny

2019

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Trematopids are a clade of terrestrial dissorophoid temnospondyls documented primarily from terrestrial Permo-Carboniferous environments in North America and Europe. Here we describe the complete skull and articulated mandibles of a diminutive trematopid specimen (OMNH 79318) from the Early Permian karst deposits near Richards Spur, Oklahoma. Based on aspects of the neurocranium (e.g., unossified sphenethmoid, prootics, epipterygoids), the specimen represents one of the best examples of a markedly immature trematopid, an important data point for understanding the early ontogeny of trematopids. Specifically, it provides evidence that variation in otic notch structure can be ontogenetically influenced, not only among eucacopine dissorophids but also among trematopids. We provisionally refer the specimen to cf. Acheloma based on the presence of a denticulate vomerine ridge and other qualitative features. However, we emphasize that the taxonomic referral is complicated by several factors that more broadly confound trematopid taxonomy. This includes a low sample size (n = 1) of many taxa and marked size, and presumed ontogenetic, disparity between the known size range of different taxa. Complementary reexamination of both Acheloma cumminsi and Acheloma dunni as part of this study also reveals that the former possesses lateral exposures of palatal bones, the presence/absence of which was the only formal character that previously differentiated the two species, although other qualitative features (e.g., size of the internarial fontanelle) may differentiate these two species. With respect to OMNH 79318, the taxonomic referral is tentative because the specimen also shares many qualitative attributes with Phonerpeton pricei, a trematopid represented only by small-bodied, probably immature individuals. However, many of these shared features are likely to be influenced by ontogeny or size. The subsequent challenges that we encountered in our taxonomic referral suggest that ontogeny may be confounding taxonomy in both diagnoses and phylogenetic analyses of trematopids and emphasize the need for careful study of how this affects our understanding of trematopid intrarelationships.

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A New Neutron Radiography / Tomography / Imaging Station DINGO at OPAL

Cited by 75 publications

References 13 publications

First Complete Wing of a Stem Group Sphenisciform from the Paleocene of New Zealand Sheds Light on the Evolution of the Penguin Flipper

First Complete Wing of a Stem Group Sphenisciform from the Paleocene of New Zealand Sheds Light on the Evolution of the Penguin Flipper

A Neutron Tomographic Analysis of Plated Silver Coins from Ancient Greece Official or Illegal?

A Juvenile Specimen of the Trematopid Acheloma From Richards Spur, Oklahoma and Challenges of Trematopid Ontogeny

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