Akihisa Takeuchi’s research while affiliated with Japan Synchrotron Radiation Research Institute and other places

... Three-dimensional CT image of closed pores in sintered pure Fe of 3.8% porosity under no load24 . ...

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Quantification of Three-Dimensional Pore Configurations in Porous Materials Using Persistent Homologyパーシステントホモロジーを用いた多孔質材料の3次元気孔配置の数値化

... Brines are a subject of intense interest to the planetary science community 39 in regard to understanding the internal structure of ice-rich worlds, and to the formation and preservation of prebiotic organics and their astrobiological potential. Samples returned from the carbonaceous asteroid Ryugu contain Ca,Mg carbonates, Mg,Na phosphate 40 and Na carbonate 41 . Extracts produced with hot water, termed salts, contain (Na + K/Na + K + Mg + Ca) of about 0.9 and, for formic acid extracts, termed carbonates, this value is roughly 0.10-0.15 ...

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An evaporite sequence from ancient brine recorded in Bennu samples

... 11,100−109 A large portion of the early work exclusively focused on lithium metal anodes and degradation mechanisms that occur at solid electrolyte-lithium metal interfaces, including void formation during electrodissolution, 59,101,107,110 dendrite initiation and penetration, 70,100,111−114 and solid electrolyte fracture. 3,104,113,115−117 Research since then has expanded to additional materials 3,118 and other aspects of SSB behavior, including cathode phase transformations, structural evolution and morphological changes, 119−121 full SSB cell failure mechanisms, 119 and the chemical evolution of electrode materials. 48,122 Figure 5a illustrates the characteristic length scales for a cathode, solid electrolyte, and lithium metal anode, which cycles 4 mAh cm −2 capacity or 100% of the active material (lithium). ...

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The State of Reliable Characterization and Testing of Solid-State Batteries

... ZG25MnCrNiMo is the primary material used for the hook tongue of rail vehicles, exhibiting characteristics such as high strength, favorable forming properties for both hot and cold machining, good corrosion resistance, and high fatigue strength [10]. The development of the railway industry toward high-speed and heavy-duty operations has significantly deteriorated the service conditions of such material. ...

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Study on the Effect of Pressure on the Microstructure, Mechanical Properties, and Impact Wear Behavior of Mn-Cr-Ni-Mo Alloyed Steel Fabricated by Squeeze Casting

... These local structures likely formed because of variations in particle agglomeration during the drying process: closely packed particles formed the high-density regions, whereas loosely packed particles formed the low-density regions. 33 The local packing distribution and pores were isotropic across all the specimens. Okuma et al. 33 fabricated alumina products via tape casting, one of the slurry processing technologies, and lamination, and they visualized a layered interface because of linearly distributed pores. ...

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Dependence of the bending properties of alumina on the in‐plane printing orientation in direct ink writing

... In the taxonomic studies of another macroturbellarian taxon, Tricladida (triclad flatworms including planarians), micro-CT imaging has yielded good results in the re-observation of type specimens as well as in the description of a new species (Carbayo and Lenihan, 2016;Silva and Carbayo, 2020). In polyclad flatworms, micro-CT scanning has been employed to explore the nervous system anatomy (Ikenaga et al., 2024); however, there has been no research using the system for taxonomic studies. The inherent gray-scale nature of CT images can limit detailed characterization when organ contrast is low. ...

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Microfocus X-Ray Computed Tomography of Paraplanocera oligoglena (Platyhelminthes: Polycladida) with an Evaluation of Histological Sections After Scanning

... For Ryugu samples, this volume fraction is ∼12% ± 4% (A. Tsuchiyama et al. 2024), which we consider the upper value (16%) to derive an upper bound on the amount of water that was physically removed after aqueous alteration. It can be calculated as ...

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A Broad Set of Solar and Cosmochemical Data Indicates High C-N-O Abundances for the Solar System

... By leveraging the dualconduction capabilities of halides, we aim to design halogenated sulfur-based cathodes that enable a single-phase reaction mechanism, thereby eliminating the challenges associated with threephase interfaces. This strategy differs from previously reported Li 2 S-LiI-MS x (M═V, Mo) and related composite materials, [30,69,70] which inherently compromise specific capacity through transition metal incorporation, despite their beneficial reduction in conductive additive requirements. Actually, improving the redox kinetics of the S/S 2− redox couple has been demonstrated by Pang et al., [2] who successfully simplified the reaction mechanism from a three-phase to a two-phase process by designing a surface redox mediator on the sulfur-based cathode. ...

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Halide Chemistry Boosts All‐Solid‐State Li‐S Batteries

... The microstructural features of these materials, such as grain boundaries, serve as pathways for hydrogen migration, while dislocations can serve as both rapid diffusion pathways and trapping sites [11]. Precipitates and the general lattice structure further complicate the diffusion processes, which can lead to localized hydrogen accumulation and the formation of cracks [4,12,13]. ...

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3D Modelling of Hydrogen Embrittlement in Austenitic Stainless Steel and Nickel-Based Superalloy: Physical metallurgy aspects on hydrogen entrapment

... This carbonate exhibits the 290.5-eV peak characteristic of the carbonate functional group (Extended Data Fig. 3), but does not diffract as crystals on TEM. Similar amorphous carbonate was observed in Ryugu samples 18,19 . This carbonate could represent an important reservoir of total carbonate ions in Bennu samples, given the abundance of phyllosilicates (about 80 vol.%) 5 . ...

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An evaporite sequence from ancient brine recorded in Bennu samples