Results 221 to 230 of about 9,047 (294)

Confirmation of the impact origin of the Late Ordovician Tvären impact structure (southeast Sweden) and emplacement of impactites in a marine setting

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract The Tvären structure in southeastern Sweden has been listed as a confirmed marine‐target impact structure for decades. However, to date, no measurements and/or indexed data of planar deformation features in quartz grains from the structure have been published or any other unequivocal evidence of impact.
Katarzyna J. Gajewska   +6 more
wiley   +1 more source

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark   +8 more
wiley   +1 more source

The Ames impact structure, Oklahoma: New radioisotopic constraints and implications for North American impact chronology

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract The Ames impact structure (Oklahoma) is thought to have formed during the Ordovician Meteor Event, based on conodont biostratigraphy of its crater fill. Here, U–Pb zircon dates from its impact‐melt portion, conducted using secondary ion mass spectrometry and laser ablation–inductively coupled plasma–mass spectrometry (n = 37 spots), yield a ...
Elizabeth J. Catlos   +9 more
wiley   +1 more source

Miniaturized chaos-assisted Spectrometer. [PDF]

open access: yesLight Sci Appl
Zhang Y, Xu C, Zhao Z, Su Y, Guo X.
europepmc   +1 more source

THE FATHERS, COMPUTERS AND US

open access: yesModern Theology, EarlyView.
Abstract This essay, designed as a complement to opinions expressed by Rowan Williams and some speakers at the conference in his honour, explores features of early Christianity which suggest a positive evaluation of artificial intelligence. Noting that the fear of reducing humans to machines has been joined in the modern age by the fear that machines ...
Mark J. Edwards
wiley   +1 more source

Why Do Voters Vote for ‘the Other Side’? Instrumental and Expressive Motives for Cross‐Ethnolinguistic Voting in Brussels

open access: yesNations and Nationalism, EarlyView.
ABSTRACT While electoral support in deeply divided societies is expected to follow segmental lines, parties often attract substantial backing from outside their core constituencies. This article examines why voters in Belgium's Brussels‐Capital Region—a consociational system designed to enable the peaceful cohabitation of the French and Dutch language ...
Benjamin Blanckaert   +2 more
wiley   +1 more source

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