Tetsuya Yokoyama

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Articles

Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis

Jun 18, 2024 | hal.science | Byeon-Gak Choi |Frédéric Moynier |Tetsuya Yokoyama |Wei Dai

Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis Mots clés Ryugu Hayabusa2 Zn isotopes Cu isotopes volatile elements CI chondrites Fichier principal 5928_3_merged_1666635744.pdf (631.96 Ko) Télécharger le fichier Origine Fichiers produits par l'(les) auteur(s)
Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample

Nov 8, 2023 | science.org | Michael Westbury |Brian R. Herb |Huibao Feng |Tetsuya Yokoyama

Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample Tetsuya Yokoyama https://orcid.org/0000-0003-2247-7232 [email protected], Meenakshi Wadhwa https://orcid.org/0000-0001-9187-1255, [...] , Tsuyoshi Iizuka https://orcid.org/0000-0001-7896-5812, Vinai Rai, [...] , Ikshu Gautam https://orcid.org/0000-0002-0415-9428, Yuki Hibiya https://orcid.org/0000-0002-3346-9820, Yuki Masuda...
A science superpower in the wings?

Feb 27, 2023 | science.org | Tetsuya Yokoyama |T. Nakamura |Hiroshi Naraoka |James Wilsdon

Declaring oneself—or aspiring to become—a global superpower sits uneasily with a British tendency towards self-deprecation. Rather, in this post-Elizabethan, post-Brexit chapter of the United Kingdom’s story, public debate is undercut by fear of decline. References to Britain’s imperial past are often sidestepped or accompanied by apologies. The exception is in political discussions of science, where assertions of national supremacy and manifest global destiny are now commonplace.
2022 AAAS Fellows approved by the AAAS Council

Feb 23, 2023 | science.org | Tetsuya Yokoyama |T. Nakamura |Hiroshi Naraoka

In October 2022, the AAAS Council elected 505 members as Fellows of AAAS. Election as a Fellow honors members whose efforts on behalf of the advancement of science or its applications in service to society have distinguished them among their peers and colleagues. Presented by section affiliation, they are:Section on Agriculture, Food, and Renewable ResourcesBryan William Brooks, Baylor UniversityJohn Chandler Cushman, University of Nevada, RenoDavid M.
Low-temperature upcycling of polyolefins into liquid alkanes via tandem cracking-alkylation

Feb 23, 2023 | science.org | Tetsuya Yokoyama |T. Nakamura |Hiroshi Naraoka |Wei Zhang

LATEST NEWS Plastics to fuels in ionic liquidsPolyethylene and polypropylene have many useful properties, but their resistance to chemical degradation makes processing their waste a challenge. In particular, heating to high temperatures to crack the underlying carbon–carbon bonds can be energy intensive. Zhang et al.
Connect elephant habitats in Asia

Feb 23, 2023 | science.org | Tetsuya Yokoyama |T. Nakamura |Hiroshi Naraoka |Priya Davidar

Information & AuthorsInformationPublished In ScienceVolume 379 | Issue 663424 February 2023CopyrightCopyright © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Submission historyPublished in print: 24 February 2023PermissionsRequest permissions for this article.
An asteroid in the laboratory

Feb 23, 2023 | science.org | Tetsuya Yokoyama |T. Nakamura |Hiroshi Naraoka

Small asteroids are leftover material from the formation of the Solar System, so samples of them could provide information on processes that occurred during that early period. The Hayabusa2 spacecraft collected about 5 grams of material from the nearby asteroid (162173) Ryugu and brought it to Earth, where scientists have access to more techniques and can collect data with far greater sensitivity than is possible with spacecraft instruments.
In Other Journals

Feb 23, 2023 | science.org | Tetsuya Yokoyama |T. Nakamura |Hiroshi Naraoka |Bianca Lopez

Agroecology Friendly neighborhood weedsBianca LopezOpen in viewerIntensive agriculture is damaging to soil microbe communities, including plant beneficial organisms. Although many crops are grown in monocultures, exposure to weeds is not always problematic because weeds can recruit microbial partners from the surrounding soil and from other plants. Hu et al. observed these “neighbor effects” between weeds and wheat plants in field and laboratory experiments.
Analyzing asteroid Ryugu

Feb 23, 2023 | science.org | Tetsuya Yokoyama |T. Nakamura |Hiroshi Naraoka

LATEST NEWS AbstractThere are more than 70,000 meteorites worldwide. Owing to spectroscopic measurements, most of these meteorites are linked to asteroids, which largely orbit in the main asteroid belt between Mars and Jupiter. In a few tens of cases, observations of a meteorite’s fall to Earth enable the calculation of an orbit that links it to part of the main asteroid belt. Rarely, however, have specific meteorite types been linked to specific asteroids.