Local variation of Be deposition in Hokuriku, Japan

Yoshida, Keisuke; Kato, Shingo; Okuyama, Shinichi; Nakano, Masanao; Ishimori, Yuu; Uchida, Kengo*; Inoue, Mutsuo*

Hoken Butsuri (Internet), 60(1), p.40 - 47, 2025/04

https://doi.org/10.5453/jhps.60.40

Monthly Be depositions were examined at four sites in Hokuriku, Japan, from 1992 to 2021. The amounts of Be depositions in Hokuriku from October to March differed locally: Depositions at Kanazawa were high (4400 Bq/m), a site along the foot of the mountains. Be depositions in the plain of Fukui city, along Wakasa Bay, and along the coast of the Noto Peninsula (3300, 2800, and 2500 Bq/m, respectively) were equivalent to those of other areas along the coast of the Sea of Japan. The local variation in Be depositions in Hokuriku is predominantly ascribed to precipitation, topographic feature, and Be concentrations.

Holocene paleolimnological changes in Rundvshetta lakes in the Soya Coast region and their paleoenvironmental significance with glacial isostatic adjustment in East Antarctica

Inoue, Genki*; Honda, Eisuke*; Ito, Keisuke*; Kang, I.*; Seto, Koji*; Tani, Yukinori*; Watanabe, Takahiro; Kashima, Kaoru*; Otani, Shuji*; Yamanaka, Toshiro*; et al.

Quaternary Science Reviews, 338, p.108822_1 - 108822_18, 2024/08

https://doi.org/10.1016/j.quascirev.2024.108822

We studied Holocene paleolimnological changes inferred from biomarkers and microscopic observation of microalgae and cyanobacteria in sediment cores from Rundvshetta lakes (Maruwanminami-ike and Maruwan o-ike) in the Soya Coast of East Antarctica, along with sedimentary facies and radiocarbon dating. Coastal marine environment: Maruwanminami-ike (147-72.5 cm, 5,010-2,590 cal BP) and Maruwan-oike (226-47.2 cm, 5,700-3,190 cal BP) were characterized by low biological production with the predominance of diatoms. Transition period of stratified brackish lake environment: Maruwanminami-ike (72.5-65.6 cm, 2,590-2,500 cal BP) and Maruwan-oike (47.2-28.8 cm, 3,190-2,890 cal BP) were characterized by stratified conditions with marine water overlain by freshwater, and a chemocline developed together with an anoxic layer in the bottom of photic zone.

Analysis of gas entrainment phenomenon from free liquid surface for a sodium-cooled fast reactor design; Validation of velocity profile and Strouhal number in a flow field

Uchida, Mao*; Hirakawa, Moe*; Sano, Aaru*; Inoue, Keisuke*; Sakai, Takaaki*; Ezure, Toshiki; Tanaka, Masaaki

Proceedings of 2020 International Conference on Nuclear Engineering (ICONE 2020) (Internet), 7 Pages, 2020/08

https://doi.org/10.1115/ICONE2020-16418

Numerical analysis using CFD code for rectangular open channel experiments has been carried out to development an evaluation method for gas entrainment phenomena at free surface of a sodium-cooled fast reactor. From the point of validation of the evaluation method, Strouhal number of vortex frequency and velocity distributions obtained from the numerical analyses were compared with experimental results. As the results, the Strouhal number of the vortex frequency behind the plate obstacle and the velocity distributions reasonably agreed with experimental results.

Initial sticking rate of O molecular beams on Ni(111) surface dependending on kinetic energy

Inoue, Keisuke*; Teraoka, Yuden

Protection of Materials and Structures from the Space Environment; Astrophysics and Space Science Proceedings, Vol.32, p.521 - 530, 2013/00

https://doi.org/10.1007/978-3-642-30229-9_48

Control of oxidation nitridation reactions at metal surfaces by molecular beams and their observation via synchrotron radiation photoemission spectroscopy

Teraoka, Yuden; Inoue, Keisuke*; Jinno, Muneaki*; Harries, J.; Yoshigoe, Akitaka

Dai-55-Kai Nihon Gakujutsu Kaigi Zairyo Kogaku Rengo Koenkai Koen Rombunshu, p.236 - 237, 2011/10

no abstracts in English

Growth of large protein crystals by a large-scale hanging-drop method

Kakinouchi, Keisuke*; Nakamura, Tsutomu*; Tamada, Taro; Adachi, Hiroaki*; Sugiyama, Shigeru*; Maruyama, Mihoko*; Takahashi, Yoshinori*; Takano, Kazufumi*; Murakami, Satoshi*; Inoue, Tsuyoshi*; et al.

Journal of Applied Crystallography, 43(4), p.937 - 939, 2010/08

https://doi.org/10.1107/S0021889810015967

A method for growing large protein crystals is described. In this method, a cut pipette tip is used to hang large-scale droplets (maximum volume 200 l) consisting of protein and precipitating agents. A crystal grows at the vapor-liquid interface; thereafter the grown crystal can be retrieved by droplet-droplet contact both for repeated macroseeding and for mounting crystals in a capillary. Crystallization experiments with peroxiredoxin of K1(thioredoxin peroxidase, ApTPx) and hen egg white lysozyme demonstrated that this large-scale hanging-drop method could produce a large-volume crystal very effectively. A neutron diffraction experiment confirmed that an ApTPx crystal (6.2 mm) obtained by this method diffracted to beyond 3.5 resolution.

Research on spherically converging ion-beam fusion neutron source for the fundamental research of atomic energy, JAERI's nuclear research promotion program, H10-050 (Contract research)

Yoshikawa, Kiyoshi*; Inoue, Nobuyuki*; Yamazaki, Tetsuo*; Makino, Keisuke*; Yamamoto, Yasushi*; Toku, Hisayuki*; Masuda, Kai*; Kii, Toshiteru*; Onishi, Masami*; Horiike, Hiroshi*; et al.

JAERI-Tech 2002-020, 63 Pages, 2002/03

JAERI-Tech-2002-020.pdf:4.94MB

no abstracts in English

Experimental determination of effective attenuation length for SiO with synchrotron radiation

Teraoka, Yuden; Inoue, Keisuke

no journal, , 

The effective attenuation length (EAL) for the photoelectron energy used is a necessary parameter for measurements of the thicknesses of overlayer films by XPS. However it has not been measured, so IMFP is substituted. All experiments were performed with the surface reaction analysis apparatus (SUREAC2000) constructed at the BL23U in the SPring-8. All measured EALs are longer than IMFP. EALs, which are calculated without suboxides, are near theoretically-calculated IMFP.

Kinetic energy effects on initial sticking of O molecular beams on Ni(111) surface

Teraoka, Yuden; Inoue, Keisuke*; Kawakami, Yasunori*; Hiraya, Atsunari*

no journal, , 

The oxidation states of Ni(111) surface, which were made by irradiation of supersonic O molecular beam (SSOMB), were analyzed by synchrotron radiation photoemission spectroscopy (SR-XPS). After irradiation of SSOMB on the Ni(111) surface to some extent, the evolution of surface oxides were observed by core level photoemission spectra of Ni2p and O1s using SR-XPS. The surface temperature was kept to be 300 K during SSOMB irradiation and SR-XPS measurements. The SR energy was 680 eV. Oxygen uptake curves were measured at every translational energy of O beam. Although the sticking probability was almost constant in the range of 0.6 eV to 2.0 eV, the remarkable increase was observed in the region over 2.0 eV. A threshold was found to be 2.0 eV.

Chemical state resolved depth-profiling using XPS and the maximum entropy method

Harries, J.; Tode, Mayumi; Inoue, Keisuke; Sumimoto, Yuichi; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

There are many available methods for determining the elemental distributions within a sample in the depth direction, but angle-resolved X-ray photoelectron spectroscopy offers the advantage of chemica-state specificity. At the surface chemistry station at BL23SU, SPring-8, we have recorded depth-profiles for thin films generated using supersonic molecular beams and ion beams. To extract the depth-direction information from the angular resolved spectra we use the maximum entropy method. We explain the techniques, and present the specific example of the natural oxide of VCrTi, a hydrogen storage material. Also, we investigate the thermal stability of the oxide by generating depth profiles during annealing of the sample.