Photoneutron emission process on nuclei around A = 200 for giant dipole resonance energies based on neutron energy and angular distribution

Nguyen, T. H. T.; Sanami, Toshiya*; Yamazaki, Hirohito*; Iwamoto, Nobuyuki; Itoga, Toshiro*; Kirihara, Yoichi; Lee, E.*; Sugihara, Kenta*; Miyamoto, Shuji*; Hashimoto, Satoshi*; et al.

Physics Letters B, 870, p.139900_1 - 139900_8, 2025/11

https://doi.org/10.1016/j.physletb.2025.139900

Nacre-like MXene/polyacrylic acid layer-by-layer multilayers as hydrogen gas barriers

Auh, Y. H.*; Neal, N. N.*; Arole, K.*; Regis, N. A.*; Nguyen, T.*; Ogawa, Shuichi*; Tsuda, Yasutaka; Yoshigoe, Akitaka; Radovic, M.*; Green, M. J.*; et al.

ACS Applied Materials & Interfaces, 17(21), p.31392 - 31402, 2025/05

https://doi.org/10.1021/acsami.5c03632

Magnetite stoichiometry (Fe(II)/Fe(III)) controls on trivalent chromium surface speciation

Scaria, J.*; Pdrot, M.*; Fablet, L.*; Yomogida, Takumi; Nguyen, T. T.*; Sivry, Y.*; Catrouillet, C.*; Pradas del Real, A. E.*; Choueikani, F.*; Vantelon, D.*; et al.

Environmental Science & Technology, 59(11), p.5747 - 5755, 2025/03

https://doi.org/10.1021/acs.est.4c12899

Understanding and predicting the interaction mechanisms between chromium and magnetite is of particular interest to elucidate the biogeochemical behavior of Cr in the environment and to develop optimal soil remediation and water treatment strategies. However, while the elimination of the most toxic form of (Cr(VI)) by its reduction to Cr(III) has widely been documented, elucidating the exact mechanism involved in Cr(III) sorption to magnetite has attracted less attention. This study examined the interaction of Cr(III) solution with 10 nm-sized magnetites, whose stoichiometries were carefully defined and preserved in anaerobic conditions. This study reveals the joint effects of pH and magnetite stoichiometry on Cr(III) sorption mechanism, and that Cr(III)-(hydr)oxide precipitation is not necessarily the driving process of Cr(III) elimination from solutions. These results will help predict the fate and transport of chromium, as well as developing magnetite-based chromium remediation processes.

Mechanical properties of base metal and heat-affected zone in friction-stir-welded AA6061-T6 at ultra-low temperature of 20 K

Nguyen, T.-D.*; Singh, C.*; Kim, Y. S.*; Han, J. H.*; Lee, D.-H.*; Lee, K.*; Harjo, S.; Lee, S. Y.*

Journal of Materials Research and Technology, 31, p.1547 - 1556, 2024/07

https://doi.org/10.1016/j.jmrt.2024.06.165

Selective recovery of thorium and uranium from leach solutions of rare earth concentrates in continuous solvent extraction mode with primary amine N1923

Nguyen, T. H.*; Le Ba, T.*; Tran, C. T.*; Nguyen, T. T.*; Doan, T. T. T.*; Do, V.-K.; Watanabe, Masayuki; Pham, Q. M.*; Hoang, S. T.*; Nguyen, D. V.*; et al.

Hydrometallurgy, 213, p.105933_1 - 105933_11, 2022/08

https://doi.org/10.1016/j.hydromet.2022.105933

A continuous counter-current extraction for the selective recovery of thorium (Th) and uranium (U) from the Yen Phu (Vietnam) rare earth concentrate leach solutions was systematically studied. The primary amine N1923 was used as an extractant which was prepared in the isoparaffin IP-2028 diluent. Thorium and uranium were selectively recovered in a hydrometallurgical circuit established by continuous mixer-settler extraction, scrubbing, and back-extraction at the laboratory scale. The desired purity of Th and U can be achieved by managing the volume ratio of organic to aqueous phase (O/A ratio) in the corresponding steps. Highly pure Th and U were recovered from the pregnant back-extraction liquor and the raffinate, respectively, which have satisfactory properties for further processing of the subsequent nuclear materials.

Progress of ultra-high-speed image sensors with in-situ CCD storage

Eto, Takeharu*; Dao, V. T. S.*; Nguyen, H. D.*; Fife, K.*; Kureta, Masatoshi; Segawa, Mariko; Arai, Masatoshi; Shinohara, Takenao

Proceedings of 2011 International Image Sensor Workshop (IISW), 4 Pages, 2011/06

http://www.imagesensors.org/Past%20Workshops/2011%20Workshop/2011%20Papers/R57_Etoh_HighSpeedCCD.pdf

This paper reviews progress of technologies on ultra-high-speed image sensors with in-situ CCD signal storage. The CCD storage for each pixel has more than one hundred CCD memory elements. Simultaneous parallel recording of signals at all pixels enables ultra-high-speed capturing of consecutive images.

Small-sized human immunodeficiency virus type-1 protease inhibitors containing allophenylnorstatine to explore the S2' pocket

Hidaka, Koshi*; Kimura, Toru*; Abdel-Rahman, H. M.*; Nguyen, J.-T.*; McDaniel, K. F.*; Kohlbrenner, W. E.*; Molla, A.*; Adachi, Motoyasu; Tamada, Taro; Kuroki, Ryota; et al.

Journal of Medicinal Chemistry, 52(23), p.7604 - 7617, 2009/07

https://doi.org/10.1021/jm9005115

A series of HIV protease inhibitor based on the allophenylnorstatine structure with various P2' moieties were synthesized. Among these analogues, we discovered that a small allyl group would maintain potent enzyme inhibitory activity compared to that of the -methylbenzyl moiety in clinical candidate 1 (KNI-764, also known as JE-2147, AG-1776 or SM-319777). Introduction of an anilinic amino group to 2 (KNI-727) improved water-solubility and anti-HIV-1 activity. X-ray crystallographic analysis of 13k (KNI-1689) with a -methallyl group at P2' position revealed hydrophobic interactions with Ala28, Ile84, and Ile50' similar to that of 1. The presence of an additional methyl group on the allyl group in compound 13k significantly increased anti-HIV activity over 1, while providing a rational drug design for structural minimization and improving membrane permeability.

Solvent extraction of palladium(II) with various ketones from nitric acid medium

Nguyen, H. T.; Watanabe, Masayuki; Kimura, Takaumi

Solvent Extraction and Ion Exchange, 25(3), p.407 - 416, 2007/00

https://doi.org/10.1080/07366290701285538

Solvent extraction of Pd(II) with various ketones in nitrobenzene from nitric acid medium was investigated. In this study, seventeen commercially available ketones were selected as representatives of alkyl ketones. It was found that several ketones effectively extracted Pd(II) from nitric acid medium. Methylalkylketones, such as 2-octanone, 2-nonanone, 2-undecanone, 2-tridecanone, and ketones containing symmetrical alkyl configuration, such as 5-nonanone, 5-decanone, 5-undecanone and 6-undecanone exhibited significant extraction of Pd(II) from nitric acid. Particularly, 2-tridecanone and 2-nonanone showed efficient extractability for Pd(II) and their extraction behavior was fully vestigated. With these extractants the partitioning of Pd(II) to the organic phase was significant at a ligand concentration of 3.0 M and acidity above 2.0 M.

Influence of coupled THM phenomena on the safety of a spent fuel repository; A Near-field study

Nguyen, T. S.*; Brgesson, L.*; Chijimatsu, Masakazu*; Fujita, Tomoo; Hernelind, J.*; Jussila, P.*; Rutqvist, J.*; Jing, L.*

Proceedings of 2nd International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modeling, Experiments and Applications (GeoProc 2006), p.141 - 149, 2006/05

In order to demonstrate the feasibility of geological disposal of spent CANDU fuel in Canada, a safety assessment was performed for a hypothetical repository in the Canadian Shield. The assessment shows that such repository would meet international criteria for dose rate; however, uncertainties in the assumed evolution of the repository were identified. Such uncertainties could be resolved by the consideration of coupled Thermal-Hydro-Mechanical-Chemical (THMC) processes. In Task A of the DECOVALEX-THMC project, THM models will be refined and used to perform near-field simulations of the evolution of the repository in order to address the above uncertainties. This paper presents the definition and rationale of Task A and the preliminary results.

Evaluation of the Impact of Thermo-Hydro-Mechanical Coupling in Bentonite and Near-Field Rock Barriers of a Nuclear Waste Repository in a Sparsely Fractured Hard Rocks

Rutqvist, J.*; Jing, L.*; Chijimatsu, Masakazu*; Millard, A.*; Nguyen, T. S.*; Rejeb, A.*; Sugita, Yutaka

Proceedings of International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modelling, Experiments and Applications (GeoProc 2003), p.205 - 211, 2003/00

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