Results 41 to 50 of about 15,594 (146)

Microspherules Formed by Lightning Strikes

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley   +1 more source

Using Cluster Abundances and Peculiar Velocities to Test the Gaussianity of the Cosmological Density Field [PDF]

, 1997
(Abridged) By comparing the frequency of typical events with that of unusual events, one can test whether the cosmological density distribution function is consistent with the normally made assumption of Gaussianity.
Bartlett J. G., Bernardeau F., Cole S., Cole S., Davis M., Ebeling H., Eke V. R., Fisher K. B., Fisher K. B., Fisher K. B., Heavens A. F., Henry J. P., Jeremiah P. Ostriker, Kaiser N., Lacey C. G., Michael A. Strauss, Weihsueh A. Chiu, White S. D. M.   +17 more
core   +2 more sources

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

Meteoritics &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, Sanna Alwmark, Mikael Calner, Sylvain Richoz, Jens Ormö, Erik Sturkell, Carl Alwmark   +6 more
wiley   +1 more source

An ansatz for spacetimes of zero gravitational mass : global monopoles and textures

, 1997
We propose a geometric ansatz, a restriction on Euclidean / Minkowski distance in the embedding space being propotional to distance in the embedded space, to generate spacetimes with vanishing gravitational mass ($R_{ik} u^i u^k = 0, u_i u^i = 1 $).
A. Vilenkin, D. Harari, D. Nötzold, E. W. Kobl, K. Narayan, M. Barriola, M. Kamionkowski, M. V. John, N. Turok, Naresh Dadhich, R. J. Gott III, R. L. Davis, V. Sahni, W. Chen   +13 more
core   +1 more source

The effects of pressure on immiscibility in metallic, core‐forming liquids: Implications for protoplanetary differentiation

Meteoritics &Planetary Science, EarlyView.
Abstract Mechanisms for metal core formation in rocky planetesimals and planetary embryos remain poorly constrained, in part due to complexities arising from immiscibility in core‐forming liquids at low pressures. To assess the pressure dependence of immiscibility and its role in protoplanetary differentiation, we performed experiments at 3 and 5 GPa ...
Geoffrey David Bromiley, Hidenori Terasaki, Matthew Varnam   +2 more
wiley   +1 more source

THE FATHERS, COMPUTERS AND US

Modern 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

The Majorana neutrino mass matrix indicated by the current data

, 2015
The Majorana neutrino mass matrix combines information from the neutrino masses and the leptonic mixing in the flavor basis. Its invariance under some transformation matrices indicates the existence of certain residual symmetry.
Ma, Bo-Qiang, Zhang, Xinyi
core   +1 more source

Aspects of Neutrino Mass Matrices [PDF]

, 2004
After an Introduction briefly describing the rise and fall of the three-zero texture of the Zee model, we discuss still-allowed two-zero textures for the Majorana three-neutrino mass matrix.
Frampton P. H., Frampton P. H., Frampton P. H., Frampton P. H., Fukugita M., P. H. FRAMPTON, Sakharov A. D., Zee A.   +7 more
core   +5 more sources

Exploring the Formation and Age of Irregular Mare Patches (IMPs) to the Southeast of the Chang'e‐5 Landing Site

Journal of Geophysical Research: Planets, Volume 131, Issue 3, March 2026.
Abstract Recently, possible exceptionally young mare volcanic glass beads were discovered in Chang'e‐5 (CE‐5) samples. Isotopic dating suggests an age of approximately 120 Ma, presenting new challenges to existing lunar thermal evolution models. Thus, our research focuses on the source region of Rima Mairan, a branch of Rima Sharp, and its surrounding ...
Zhonglu Lei, Zhizhong Kang, Teng Hu, C. H. van der Bogert, Jinghao Cai, Xiaojian Xu, Harald Hiesinger   +6 more
wiley   +1 more source

Signatures of Topological Defects in the Microwave Sky: An Introduction [PDF]

, 1997
An introduction to topological defects in cosmology is given. We discuss their possible relevance for structure formation. Especial emphasis is given on the signature of topological defects in the spectrum of anisotropies in the cosmic microwave ...
Durrer, Ruth
core   +1 more source