scholarly journals Projecting into the Third Dimension: 3D Ore Mineralogy via Machine Learning of Automated Mineralogy and X-Ray Microscopy

2019 ◽  
Vol 25 (S2) ◽  
pp. 410-411
Author(s):  
Matthew R. Ball ◽  
Joshua F. Einsle ◽  
Matthew Andrew ◽  
David D. McNamara ◽  
Richard J.M. Taylor ◽  
...  
Keyword(s):  
Machine Learning ◽  
X Ray ◽  
The Third ◽  
Ore Mineralogy ◽  
Automated Mineralogy ◽  
Third Dimension

scholarly journals Searches for pulsar-like candidates from unidentified objects in the Third Catalog of Hard Fermi-LAT Sources with machine learning techniques

2020 ◽  
Vol 495 (1) ◽  
pp. 1093-1109 ◽  
Author(s):  
C Y Hui ◽  
Jongsu Lee ◽  
K L Li ◽  
Sangin Kim ◽  
Kwangmin Oh ◽  
...  
Keyword(s):  
Machine Learning ◽  
Globular Clusters ◽  
Classification Scheme ◽  
Spectral Energy Distribution ◽  
Machine Learning Techniques ◽  
Spectral Energy ◽  
Periodic Signal ◽  
X Ray ◽  
The Third ◽  
Γ Ray

ABSTRACT We report the results of searching pulsar-like candidates from the unidentified objects in the Third Catalog of Hard Fermi-LAT Sources (3FHL). Using a machine-learning-based classification scheme with a nominal accuracy of $\sim \!98{{\, \rm per\, cent}}$, we have selected 27 pulsar-like objects from 200 unidentified 3FHL sources for an identification campaign. Using archival data, X-ray sources are found within the γ-ray error ellipses of 10 3FHL pulsar-like candidates. Within the error circles of the much better constrained X-ray positions, we have also searched for the optical/infrared counterparts and examined their spectral energy distributions. Among our shortlisted candidates, the most secure identification is the association of 3FHL J1823.3–1339 and its X-ray counterpart with the globular cluster Mercer 5. The γ-rays from the source can be contributed by a population of millisecond pulsars residing in the cluster. This makes Mercer 5 as one of the slowly growing hard γ-ray population of globular clusters with emission >10 GeV. Very recently, another candidate picked by our classification scheme, 3FHL J1405.1–6118, has been identified as a new γ-ray binary with an orbital period of 13.7 d. Our X-ray analysis with a short Chandra observation has found a possible periodic signal candidate of ∼1.4 h and a putative extended X-ray tail of ∼20 arcsec long. Spectral energy distribution of its optical/infrared counterpart conforms with a blackbody of Tbb ∼ 40 000 K and Rbb ∼ 12 R⊙ at a distance of 7.7 kpc. This is consistent with its identification as an early O star as found by infrared spectroscopy.

Unusual Potassium-η2-Aromatic Interactions in the Crystal Structure of the Diphenylarsenide Transfer Reagent, KAsPh2·2(1,4-Dioxane)

2013 ◽  
Vol 66 (10) ◽  
pp. 1260
Author(s):  
Michael C. Adams ◽  
George A. Koutsantonis ◽  
Brian W. Skelton ◽  
Allan H. White
Keyword(s):  
Crystal Structure ◽  
Potassium Atom ◽  
Two Dimensional ◽  
Sodium Complex ◽  
X Ray ◽  
The Third ◽  
Aromatic Interactions ◽  
Square Planar ◽  
Planar Array ◽  
Third Dimension

In attempting the metallation of 1,2-bis(diphenylarsino)ethane, the title compound KAsPh2·2(1,4-dioxane) was obtained and characterised with a single crystal X-ray structure determination. Like the sodium counterpart, which is a monosolvate, NaAsPh2·1,4-dioxane, the complex may be considered as a two-dimensional polymer, the potassium atoms being linked by bridging 1,4-dioxane units, the oxygen atoms of which form a quasi-square planar array about the potassium atom (K–O 2.676–2.839(3) Å). Unlike the sodium complex, in which arsenide bridging is an intrinsic motif in the construction of the polymer, the K⋯As distance here is long (3.4662(10) Å), with the anion being terminal/monodentate, and counterposed in what may be considered a quasi-octahedral coordination sphere, by a trans-approach to two atoms of a neighbouring aromatic ring (K⋯C(ar) 3.361, 3.416(4) Å), extending the polymer in the third dimension.

scholarly journals Insight into diatom frustule structures using various imaging techniques

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Izabela Zgłobicka ◽  
Jürgen Gluch ◽  
Zhongquan Liao ◽  
Stephan Werner ◽  
Peter Guttmann ◽  
...  
Keyword(s):  
State Of The Art ◽  
Imaging Techniques ◽  
Length Scale ◽  
Suitable Model ◽  
Diatom Frustule ◽  
X Ray ◽  
The Third ◽  
Third Dimension ◽  
Visualization Techniques ◽  
Insight Into

AbstractThe diatom shell is an example of complex siliceous structure which is a suitable model to demonstrate the process of digging into the third dimension using modern visualization techniques. This paper demonstrates importance of a comprehensive multi-length scale approach to the bio-structures/materials with the usage of state-of-the-art imaging techniques. Imaging of diatoms applying visible light, electron and X-ray microscopy provide a deeper insight into the morphology of their frustules.

Der Einfluß der Inaktivitätsosteoporose auf die szintigraphische Darstellung knöcherner Verletzungen im Bereich des Handgelenks

1989 ◽  
Vol 28 (04) ◽  
pp. 124-128 ◽  
Author(s):  
J. Spitz ◽  
N. Clemenz ◽  
K. Tittel ◽  
H. Weigand
Keyword(s):  
Bone Scintigraphy ◽  
Plaster Cast ◽  
Scaphoid Bone ◽  
X Ray ◽  
The Third ◽  
High Level ◽  
Clinical Conditions ◽  
Rate Of Accumulation

In addition to its established oncological indications the sensitivity of bone scintigraphy is of steadily increasing significance in traumatology. Inactivity- induced osteoporosis plays a major role during the immobilization period in the plaster cast. In the region of the joints remodelling intensity may reach such a high level that the non-injured bone shows a higher rate of accumulation than the fracture. This process already begins between the third and fourth week of immobilization. The highest uptake is found after fracture of the scaphoid bone at the end of twelve weeks of immobilization. Control scintigraphies at intervals of several days are indicated to differentiate between various clinical conditions (pseudoarthrosis, activated osteoarthrosis, algodystrophy in case of doubtful x-ray results).

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