TomoPy: A framework for the analysis of synchrotron tomographic data

2014 ◽  
Author(s):  
Doğa Gürsoy ◽  
Francesco De Carlo ◽  
Xianghui Xiao ◽  
Chris Jacobsen
Keyword(s):  
Tomographic Data

scholarly journals Modeling the separation performance of depth filter considering tomographic data

2020 ◽  
Vol 39 (5) ◽  
Author(s):  
Kevin Hoppe ◽  
Michail Maricanov ◽  
Gerhard Schaldach ◽  
Reiner Zielke ◽  
Dirk Renschen ◽  
...  
Keyword(s):  
Separation Performance ◽  
Tomographic Data

scholarly journals Questioning hagfish affinities of the enigmatic Devonian vertebrate Palaeospondylus

2017 ◽  
Vol 4 (7) ◽  
pp. 170214 ◽  
Author(s):  
Zerina Johanson ◽  
Moya Smith ◽  
Sophie Sanchez ◽  
Tim Senden ◽  
Kate Trinajstic ◽  
...  
Keyword(s):  
Semicircular Canals ◽  
Crown Group ◽  
Vertebral Centra ◽  
Stem Group ◽  
Tomographic Data

Palaeospondylus gunni Traquair, 1890 is an enigmatic Devonian vertebrate whose taxonomic affinities have been debated since it was first described. Most recently, Palaeospondylus has been identified as a stem-group hagfish (Myxinoidea). However, one character questioning this assignment is the presence of three semicircular canals in the otic region of the cartilaginous skull, a feature of jawed vertebrates. Additionally, new tomographic data reveal that the following characters of crown-group gnathostomes (chondrichthyans + osteichthyans) are present in Palaeospondylus : a longer telencephalic region of the braincase, separation of otic and occipital regions by the otico-occipital fissure, and vertebral centra. As well, a precerebral fontanelle and postorbital articulation of the palatoquadrate are characteristic of certain chondrichthyans. Similarities in the structure of the postorbital process to taxa such as Pucapampella , and possible presence of the ventral cranial fissure, both support a resolution of Pa. gunni as a stem chondrichthyan. The internally mineralized cartilaginous skeleton in Palaeospondylus may represent a stage in the loss of bone characteristic of the Chondrichthyes.

scholarly journals Asymmetric Genome Organization in an RNA Virus Revealed via Graph-Theoretical Analysis of Tomographic Data

2015 ◽  
Vol 11 (3) ◽  
pp. e1004146 ◽  
Author(s):  
James A. Geraets ◽  
Eric C. Dykeman ◽  
Peter G. Stockley ◽  
Neil A. Ranson ◽  
Reidun Twarock
Keyword(s):  
Theoretical Analysis ◽  
Genome Organization ◽  
Rna Virus ◽  
Graph Theoretical Analysis ◽  
Tomographic Data

Use of various keratometry data (ring and zone) in trifocal IOL calculation

2021 ◽  
pp. 53-56
Author(s):  
A.D. Loginova ◽  
◽  
S.V. Shukhaev ◽  
S.S. Kudlakhmedov ◽  
E.V. Boiko ◽  
...  
Keyword(s):  
Power Distribution ◽  
Optical Power ◽  
Iol Implantation ◽  
Universal Formula ◽  
Significant Difference ◽  
Trifocal Iol ◽  
Iol Calculation ◽  
Km Value ◽  
Tomographic Data ◽  
Corneal Refractive Power

Purpose. To compare the results of trifocal IOL calculation using various corneal tomographic data (ring and zone). Methods. This retrospective study involved 46 patients (46 eyes), underwent cataract surgery with trifocal IOL implantation (AcrySof IQ PanOptix). The calculation was performed using Tomey OA-2000 according to 2 formulas (Barrett II Universal, Olsen). Keratometry values included Km (the average of two main meridians of a cornea) provided by Pentacam HR Power Distribution Apex map, which describes total corneal refractive power (TCRP) with diameter of 3.0, 4.0 and 5.0 mm on a ring and zone. Mean (MAE) and median (MedAE) predicted postoperative refraction errors were assessed after surgery. Results. Mean Km value on 3 mm zone and ring was: 42.75±1,46 D and 42,91±1,43 D, respectively (p<0,0001). Mean Km on 4 mm zone and ring was: 42.6±1.5 D and 43.3 ± 1.5 D, respectively (p <0.005). Mean Km value on 5 mm zone and ring was: 43,09±1,5 D and 43,55±1,48 D, respectively (p<0,0001). Calculations using the Barrett II Universal formula revealed significant difference between MAE and MedAE of the predicted postoperative refraction on 5mm zone and ring (p=0.045). When using the Olsen formula in the calculations, significant difference was revealed using the Km data with a diameter of 3 mm and 5 mm (p=0.001 и p=0.009, respectively). The calculation on 3 mm ring was more accurate than for 3 mm zone. With a 5 mm diameter, the calculation is more accurate according to the zone data. Conclusion. Mean Km value on Power Distribution Apex map according to ring is significantly greater then according to zone. 1) The calculation of the trifocal IOL based on the TCRP zone data is reliably more accurate than the ring data according to both formulas (Barrett II Universal and Olsen) with a diameter of 5 mm. 2) According to the Olsen formula with a diameter of 3 mm, the calculation of the optical power of trifocal IOL based on TCRP ring data is more accurate. Key words: IOL calculation, Trifocal IOL, corneal topography

The preserved plume conduits of the Caribbean Large Igneous Plateau and their relation with the Galápagos hotspot back to 90 Ma

2021 ◽  
Author(s):  
Angela Maria Gomez Garcia ◽  
Eline Le Breton ◽  
Magdalena Scheck-Wenderoth ◽  
Gaspar Monsalve ◽  
Denis Anikiev
Keyword(s):  
Reference Frames ◽  
Thermal Anomaly ◽  
Caribbean Region ◽  
Positive Density ◽  
South American ◽  
Kinematic Models ◽  
Tomographic Data ◽  
The Caribbean ◽  
Moho Depths ◽  
South American Continent

&lt;p&gt;Remnants of the Caribbean Large Igneous Plateau (C-LIP) are found as thickened zones of oceanic crust in the Caribbean Sea, that formed during strong pulses of magmatic activity around 90 Ma. Previous studies have proposed the Gal&amp;#225;pagos hotspot as the origin of the thermal anomaly responsible for the development of this igneous province. Particularly, geochemical signature relates accreted C-LIP fragments along northern South America with the well-known hotspot material.&lt;/p&gt;&lt;p&gt;In this research, we use 3D lithospheric-scale structural and density models of the Caribbean region, in which up-to-date geophysical datasets (i.e.: tomographic data, Moho depths, sedimentary thickness, and bathymetry) have been integrated. Based on the gravity residuals (modelled minus observed EIGEN6C-4 dataset), we reconstruct density heterogeneities both in the crust and the uppermost oceanic mantle (&lt; 50km).&lt;/p&gt;&lt;p&gt;Our results suggest the presence of two positive mantle density anomalies in the Colombian and the Venezuelan basins, interpreted as the preserved plume material which migrated together with the Proto-Caribbean plate from the east Pacific. Such bodies have never been identified before, but a positive density trend is also observed in the mantle tomography, at least down to 75 km depth.&lt;/p&gt;&lt;p&gt;Using recently published regional plate kinematic models and absolute reference frames, we test the hypothesis of the C-LIP origin in the Gal&amp;#225;pagos hotspot. However, misfits of up to ~3000 km between the present hotspot location and the mantle anomalies, reconstructed back to 90 Ma, is observed, as other authors reported in the past.&lt;/p&gt;&lt;p&gt;Therefore, we discuss possible sources of error responsible for this offset and pose two possible interpretations: 1. The Gal&amp;#225;pagos hotspot migrated (~1200-3000 km) westward while the Proto-Caribbean moved to the northeast, or 2. The C-LIP was formed by a different plume, which &amp;#8211; if considered fixed - would be nowadays located below the South American continent.&lt;/p&gt;

scholarly journals Data Pruning of Tomographic Data for the Calibration of Strain Localization Models

2018 ◽  
Author(s):  
William Hilth ◽  
David Ryckelynck ◽  
Claire Menet
Keyword(s):  
Model Updating ◽  
Element Model ◽  
Sampled Data ◽  
Model Free ◽  
Reduction Techniques ◽  
Long Term Storage ◽  
X Ray Computed ◽  
Tomographic Data ◽  
Data Pruning

The development and generalization of Digital Volume Correlation (DVC) on X-ray computed tomography data highlight the issue of long term storage. The present paper proposes a new model-free method for pruning the DVC data. The size of the remaining sampled data can be user-defined, depending on the needs concerning storage space. The data pruning procedure is deeply linked to hyper-reduction techniques. The DVC data of a resin-bonded sand tested in uniaxial compression is used as an illustrating example. The relevance of the pruned data is tested afterwards for model calibration. A new Finite Element Model Updating (FEMU) technique coupled with an hybrid hyper-reduction method is used to successfully calibrate a constitutive model of the resin bonded sand with the pruned data only.

scholarly journals Rock Mass Characteristics and Tomographic Data

2018 ◽  
Vol 51 (5) ◽  
pp. 1615-1619 ◽  
Author(s):  
J. Vatcher ◽  
S. D. McKinnon ◽  
J. Sjöberg
Keyword(s):  
Rock Mass ◽  
Tomographic Data
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