Results 31 to 40 of about 65,084 (220)

The effect of aqueous alteration and metamorphism in the survival of presolar silicate grains in chondrites [PDF]

, 2008
Relatively small amounts (typically between 2-200 parts per million) of presolar grains have been preserved in the matrices of chondritic meteorites.
Bischoff, Bonal, Brearley, Brearley, Chizmadia, Floss, Floss, Grady, Grossman, Huss, Huss, Hutchison, Jewitt, Josep M. Trigo-Rodriguez, Jürgen Blum, Kobayashi, Krot, Lee, Leitner, Marhas, Marhas, Mostefaoui, Nagashima, Nguyen, Ott, Scott, Stadermann, Trigo-Rodríguez, Vollmer, Weisberg, Williams, Zinner   +31 more
core   +2 more sources

Silica-rich volcanism in the early solar system dated at 4.565 Ga

Nature Communications, 2018
Achondritic meteorites can record volcanism and crust formation on planetesimals in the early Solar System. Here, the authors date the Northwest Africa 11119 meteorite with an Al-Mg age of 4564.8 ± 0.3 Ma indicating that this is the earliest evidence of ...
Poorna Srinivasan, Daniel R. Dunlap, Carl B. Agee, Meenakshi Wadhwa, Daniel Coleff, Karen Ziegler, Ryan Zeigler, Francis M. McCubbin   +7 more
doaj   +1 more source

Orbital evolution of P\v{r}\'{i}bram and Neuschwanstein

, 2011
The orbital evolution of the two meteorites P\v{r}\'{i}bram and Neuschwanstein on almost identical orbits and also several thousand clones were studied in the framework of the N-body problem for 5000 years into the past.
A. Pauls, B.A. Lindblad, D.C. Jones, D.C. Jones, D.O. ReVelle, H. Stauffer, I. Halliday, J. Oberst, J.S. Stuart, Juraj Tóth, Leonard Kornoš, P. Brown, P. Spurný, P. Vereš, P. Vereš, Peter Vereš, R.B. Southworth, V. Porubčan, W.F. Bottke, Z. Ceplecha, Z. Wu   +20 more
core   +1 more source

Bimetallic (NiFe) and Trimetallic (NiFeCr) Nanoalloys from Metal Oxides Using a Microwave Hydrogen Plasma

Advanced Engineering Materials, EarlyView.
Bimetallic (NiFe) and trimetallic (NiFeCr) nanoalloys (NAs) are synthesized using corresponding oxide mixtures using microwave hydrogen plasma within a few milliseconds. The process simultaneously 1) reduces metal oxides to metals; 2) downsizes the particles from micrometers to nanometers; and 3) blends the metals to form NAs.
Sachin Kumar, Mohammad Kazemi, Zichang Xiong, Thomas Cameron, Julian Held, Uwe Kortshagen   +5 more
wiley   +1 more source

Fluid evolution in CM carbonaceous chondrites tracked through the oxygen isotopic compositions of carbonates [PDF]

, 2017
The oxygen isotopic compositions of calcite grains in four CM carbonaceous chondrites have been determined by NanoSIMS, and results reveal that aqueous solutions evolved in a similar manner between parent body regions with different intensities of ...
Alexander, Alexander, Barber, Benedix, Bland, Bonal, Bunch, Burbine, Clark, Clayton, Clayton, de Leuw, DuFresne, Emery, Fujiya, Fujiya, Guo, Hewins, Horita, Howard, I.A. Franchi, Jenniskens, Johnson, Kasuga, Lauretta, Lee, Lee, Lee, Lee, Lee, Lee, Lindgren, Lindgren, M.R. Lee, Marrocchi, McSween, McSween, N.A. Starkey, P. Lindgren, Palguta, Rubin, Rubin, Starkey, Tomeoka, Tyra, Tyra, Tyra, Velbel, Young, Young   +49 more
core   +2 more sources

PERICLES: A Set of Empirical Rotational Isochrones Modeled on Cool Dwarfs in Open Clusters and Wide Binaries

Astronomische Nachrichten, EarlyView.
ABSTRACT Isochrones, equal‐age curves, are widely used in astrophysics to estimate stellar ages. Classical stellar parameters are, however, very limited in their usability for main sequence stars because of their weak age‐dependence. Here, rotation period measurements provide complementary information.
David Gruner, Sydney A. Barnes
wiley   +1 more source

Trace element composition of troilite, iron and iron-nickel metall from meteorite Chelyabinsk

Литосфера, 2015
We studied the contents of trace elements in troilite, iron and in iron-nickel metal from meteorite Chelyabinsk by means of LA-ICP-MS. The features of the distribution of siderophile and chalcophile elements in sulfide and metallic phase in gray and ...
S. Yu. Stepanov, S. V. Berzin
doaj   +2 more sources

Petrography and bulk composition of Miller Range 05035: a new lunar VLT gabbro [PDF]

, 2007
Miller Range (MIL) 05035 is a crystalline lunar mare gabbroic meteorite collected in Antarctica in 2005 [1]. It is an important new sample in the lunar meteorite (LM) collection as it is only one of ~8 to be classified as basaltic in nature. MIL 05035 is
Anand, M., Crawford, I. A., Joy, K. H., Russell, S. S.   +3 more
core  

Spectral properties of the largest asteroids associated with Taurid Complex [PDF]

, 2014
We obtained spectra of six of the largest asteroids (2201, 4183, 4486, 5143, 6063, and 269690) associated with Taurid complex. The observations were made with the IRTF telescope equipped with the spectro-imager SpeX.
Birlan, M., Cristescu, C. P., Nedelcu, D. A., Popescu, M., Vaubaillon, J.   +4 more
core   +2 more sources

Charge State Influence on Stability and Isomerism in Dehydrogenated PAHs: Insights from Anthracene, Acridine, and Phenazine

ChemPhysChem, Volume 26, Issue 6, March 15, 2025.
The ionization of anthracene, acridine, and phenazine has been explored, along with the removal of one and two hydrogen atoms, to provide valuable information for astrochemists and to understand the behavior of the resulting structures and their electronic reorganization. Abstract In this study, we systematically explored the stability and isomerism of
Khaldia Zghida, Farouk Hamza Reguig, Manuel Alcamí, Al Mokhtar Lamsabhi   +3 more
wiley   +1 more source