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Electronic Properties of AnSn3 (An = Th, U, Np, and Pu)
Yasutomi Tatetsu,Eijiro Sakai,Takahiro Maehira 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The energy band structures of AnSn3 (An=Th, U, Np, and Pu) are investigated by using arelativistic linear augmented plane wave method with the exchange-correlation potential in thelocal density approximation. The energy bands near the Fermi level are mainly caused by thehybridization between the 5f and Sn 5p electrons of the actinides. The similarity of the Fermi surfacestructures in the AnSn3 compounds can be understood by using the change in the electron numbersinside the Fermi surfaces based on the rigid-band picture. The theoretical angular dependence ofthe de Haas-van Alphen frequencies in ThSn3 has been investigated.
DX Challenges in Azabudai Hills
Ayako Yasutomi,Shinsuke Inoue Council on Tall Building and Urban Habitat Korea 2023 International journal of high-rise buildings Vol.12 No.3
Azabudai Hills is located in the area connecting Kamiyacho on the Hibiya Line and Roppongi 1-chome on the Nanboku Line, and was planned as a district with three skyscrapers arranged around a plaza. Based on the concept of a "Modern Urban Village", the project integrates a variety of urban functions, including offices, residences, a hotel, an international school, commercial and cultural facilities. The construction of the 64-story and 330-meter-high, "A block" was extremely difficult due to its large scale and diverse uses. This paper presents a case study of DX challenges to improve productivity and ensure quality, as well as the resulting benefits and future challenges.
Sparse Convex Clustering Based on ℓ₂-Norm Regularization on Probability Simplex
Suguru Yasutomi,Toshihisa Tanaka 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Convex clustering is a clustering method that does not require the number of clusters in advance. This method is based on the mixture models which have all the samples as the means of clusters and clustering is achieved by finding sparse mixing weights. However, a large number of iterations are needed until convergence because its objective function does not evaluate the sparsity of the mixing weights. This article derives an efficient algorithm for convex clustering with regularization that represents sparsity. Focusing on the fact that sparse solutions on the probability simplex which is the solution space of the convex clustering have a large ℓ₂-norm, we use the ℓ₂-norm to regularize the solution. Experimental results show that the proposed method converges faster ones and the proposed regularization is adequate to represent sparsity.
Nishiguchi, T.,Cho, K.,Yasutomi, M.,Ueno, M.,Yamaguchi, K.,Basti, L.,Yamasaki, Y.,Takeshita, S.,Kim, D.,Oda, T. Elsevier/North Holland Biomedical Press 2016 Aquatic toxicology Vol.179 No.-
<P>A harmful dinoflagellate, Heterocapsa circularisquama, is highly toxic to shellfish and the zooplankton rotifer Brachionus plicatilis. A previous study found that H. circularisquama has both light-dependent and -independent haemolytic agents, which might be responsible for its toxicity. Detailed analysis of the haemolytic activity of H. circularisquama suggested that light-independent haemolytic activity was mediated mainly through intact cells, whereas light-dependent haemolytic activity was mediated by intracellular agents which can be discharged from ruptured cells. Because H. circularisquama showed similar toxicity to rotifers regardless of the light conditions, and because ultrasonic ruptured H. circularisquama cells showed no significant toxicity to rotifers, it was suggested that live cell-mediated light-independent haemolytic activity is a major factor responsible for the observed toxicity to rotifers. Interestingly, the ultrasonic-ruptured cells of H. circularisquama suppressed their own lethal effect on the rotifers. Analysis of samples of the cell contents (supernatant) and cell fragments (precipitate) prepared from the ruptured H. circularisquama cells indicated that the cell contents contain inhibitors for the light-independent cell-mediated haemolytic activity, toxins affecting H. circularisquama cells themselves, as well as light-dependent haemolytic agents. Ethanol extract prepared from H. circularisquama, which is supposed to contain a porphyrin derivative that displays photosensitising haemolytic activity, showed potent toxicity to Chattonella marina, Chattonella antiqua, and Karenia mikimotoi, as well as to H. circularisquama at the concentration range at which no significant toxicity to rotifers was observed. Analysis on a column of Sephadex LH-20 revealed that light-dependent haemolytic activity and inhibitory activity on cell-mediated light-independent haemolytic activity existed in two separate fractions (f-2 and f-3), suggesting that both activities might be derived from common compounds. Our results suggest that the photosensitising haemolytic toxin discharged from ruptured H. circularisquama cells has a relatively broad spectrum of phytoplankton toxicity, and that physical collapse of H. circularisquama cells can lead not only to the disappearance of its own toxicity, but also to mitigation of the effects of other HABs. (C) 2016 Elsevier B.V. All rights reserved.</P>
Electronic Structures of of PuX (X=S, Se, Te)
Takahiro Maehira,Eijiro Sakai,Yasutomi Tatetsu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have calculated the energy band structures and the Fermi surfaces of PuS, PuSe, and PuTeby using a self-consistent relativistic linear augmented-plane-wave method with the exchange andcorrelation potential in the local density approximation. In general, the energy bands near theFermi level are mainly caused by the hybridization between the Pu 5f and the monochalcogenidep electrons. The obtained main Fermi surfaces consisted of two hole sheets and one electron sheet,which were constructed from the band having both the Pu 5f state and the monochalcogenide pstate.
Design and Construction of GINZA KABUKIZA
Kawamura, Hiroshi,Ishibashi, Yoji,Morofushi, Tsutomu,Saragai, Yasuyuki,Inubushi, Akira,Yasutomi, Ayako,Fuse, Naohiko,Yoshifuku, Manabu,Saitoh, Kouji Council on Tall Building and Urban Habitat Korea 2016 International journal of high-rise buildings Vol.5 No.3
This paper describes the structural solution for the design of a 29-story high-rise tower, which features a large office space above the Kabukiza Theatre. Kabuki is a type of Japanese traditional drama, and Kabukiza is the home building of Kabuki. GINZA KABUKIZA is the fifth generation of the Kabukiza Theatre, the first of which was built in 1889. In order to support 23 stories of office space above the theater - featuring a large void in plan - two 13-meter-deep mega-trusses, spanning 38.4 meters, are installed at the fifth floor of the building. Steelwork is used as a primary material for the structure above-ground, and a hybrid response control system using a buckling-restrained brace and oil damper is adopted in order to achieve a high seismic performance. This paper also describes the erection process of installing hydraulic jacks directly above the mega-truss at column bases, in order to keep the structure above the truss level during construction. The temple architecture of the previous Kabukiza is carefully restored by incorporating contemporary light-weight materials supported by steelwork.