Results 31 to 40 of about 64,884 (241)
Emergent Chemical Reactivity and Complexity of RNA Condensates
Angewandte Chemie International Edition, EarlyView.RNA condensates capable of substrate enrichment and catalysis modulate their environment. Could this start a catalytic selection loop or evolution? Abstract The RNA world hypothesis posits the existence of life‐like assemblies that consisted mostly of RNA.
Samuel Hauf +4 more
wiley +1 more source
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
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 +3 more
wiley +1 more source
Study of Iron and Stony Meteorite Ablation Based on Simulation Experiments in an Arc Heater
The Astrophysical JournalTo observe meteorite ablation, simulation experiments were conducted on the L5 ordinary chondrite and IAB-MG iron meteorites in an arc-heated facility and three flight conditions were reproduced.
Lei Wang +7 more
doaj +1 more source
The pre-atmospheric size of Martian meteorites [PDF]
, 2002 The pre-atmospheric size of martian meteorites was calculated based on 80Kr produced by epithermal secondary cosmic-ray produced neutrons of 30-300 eV energy.
Busemann, H. +2 more
core
Low‐Frequency Raman Spectra of Natural Pyrrhotites: Polarization Dependence for Its Lattice Modes
Journal of Raman Spectroscopy, EarlyView.The present study found low‐wavenumber Raman modes of pyrrhotite Fe1‐xS at ~68, ~87, ~117, and ~230 cm−1 for the first time, thanks to a lab‐built Raman spectrometer, in which the optical path of the incident laser was purged by Ar gas. The sufficiently high signal‐to‐noise and signal‐to‐base ratios enabled us to obtain the polarization dependence of ...
Shu‐hei Urashima +5 more
wiley +1 more source
Young asteroidal fluid activity revealed by absolute age from apatite in carbonaceous chondrite
Nature Communications, 2016 Chondritic meteorites formed in the early solar system and may tell us about primary processes at that time. Here, Zhang et al. report an absolute 207Pb/206Pb isochron age (4,450±50 Ma) of apatite from a carbonaceous chondrite constraining timing of ...
Ai-Cheng Zhang +7 more
doaj +1 more source
Meteorites: Messengers from the Early Solar System
CHIMIA, 2010 Meteorites are fragments from solar system bodies, dominantly asteroids. A small fraction is derived from the Moon and from Mars. These rocks tell a rich history of the early solar system and range from solids little changed since the earliest ...
Beda A. Hofmann
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Rare‐Earth‐Free Iron‐Based Permanent Magnets: Progress, Challenges, and Perspectives
MetalMat, EarlyView.Rare‐earth (RE)‐free iron‐based permanent magnets have gained attention as inexpensive, environmentally friendly alternatives to conventional RE‐based magnets. This review focuses on emerging Fe‐based hard magnets, discussing the fundamental principles governing their permanent magnetism and various examples of Fe‐based systems with emphasis on their ...
Sunbeom Park +4 more
wiley +1 more source
Search and Collection of Yamato Meteorites, Antarctica, in October and November 1974
Antarctic Record, 1976 From October 25, 1974 to January 17, 1975 a four-man party of the 15th Japanese Antarctic Research Expedition (1973-1975) made an oversnow traverse to the Yamato Mountains area for a systematic search for the Yamato meteorites and geological survey.
Keizo YANAI
doaj +1 more source