Evidence map›Paper›PMID 37553360›Full record

ArticleNPJ microgravity2023

Granular flow experiment using artificial gravity generator at International Space Station.

S Ozaki, G Ishigami, M Otsuki, H Miyamoto, K Wada, Y Watanabe, T Nishino, H Kojima, K Soda, Y Nakao and 3 more

Erratum issuedAbstract read
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In one paragraph

Article in NPJ microgravity, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 3 papers.

0numbers the graph read from it
0cells of the map it votes in
3citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

3 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

13 authors.

S Ozaki *Yokohama National University, Yokohama, Japan. s-ozaki@ynu.ac.jp.ORCID http://orcid.org/0000-0003-3450-6774
G Ishigami *Keio University, Yokohama, Japan.ORCID http://orcid.org/0000-0003-2107-3471
M Otsuki *Japan Aerospace Exploration Agency, Sagamihara, Japan.ORCID http://orcid.org/0000-0003-4303-1272
H MiyamotoThe University of Tokyo, Tokyo, Japan.
K WadaChiba Institute of Technology, Chiba, Japan.ORCID http://orcid.org/0000-0002-6710-1768
Y WatanabeYokohama National University, Yokohama, Japan.
T NishinoYokohama National University, Yokohama, Japan.
H KojimaKeio University, Yokohama, Japan.
K SodaKeio University, Yokohama, Japan.
Y NakaoKeio University, Yokohama, Japan.
M SutohJapan Aerospace Exploration Agency, Sagamihara, Japan.ORCID http://orcid.org/0000-0002-6890-4554
T MaedaTokyo University of Agriculture and Technology, Fuchu, Japan.
T KobayashiRitsumeikan University, Kusatsu, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Studying the gravity-dependent characteristics of regolith, fine-grained granular media covering extra-terrestrial bodies is essential for the reliable design and analysis of landers and rovers for space exploration. In this study, we propose an experimental approach to examine a granular flow under stable artificial gravity conditions for a long duration generated by a centrifuge at the International Space Station. We also perform a discrete element simulation of the granular flow in both artificial and natural gravity environments. The simulation results verify that the granular flows in artificial and natural gravity are consistent. Further, regression analysis of the experimental results reveals that the mass flow rate of granular flow quantitatively follows a well-known physics-based law with some deviations under low-gravity conditions, implying that the bulk density of the granular media decreases with gravity. This insight also indicates that the bulk density considered in simulation studies of space probes under low-gravity conditions needs to be tuned for their reliable design and analysis.

Identifiers

PMID37553360
PMCPMC10409782

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.