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A Rational Entry to Cyclic Polymers via Spontaneous and Selective Cyclization Reactions
Daisuke Aoki 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Although recent advances in chemistry have made it possible to synthesize polymers with various topologies, effective routes that selectively afford cyclic topology in high yield and quantity still remain limited. This is mostly due to difficulties associated with purification, and, in particular, the selectivity of macrocyclizations. In this work, effective synthetic methods for the cyclic polymers were developed by utilizing supramolecular chemistry<sup>1</sup> and dynamic covalent chemistry.<sup>2</sup> (1) D. Aoki et al., J. Am. Chem. Soc., 139, 6791 (2017). (2) D. Aoki et al., Angew. Chem. Int. Ed., 59, 4269 (2020).
Aoki Yoshitaka,Nakajima Mikio,Sugimura Sho,Suzuki Yasuhito,Makino Hiroshi,Obata Yukako,Doi Matsuyuki,Nakajima Yoshiki 대한마취통증의학회 2023 Korean Journal of Anesthesiology Vol.76 No.5
Background: Choosing catecholamines, such as norepinephrine and dopamine, for perioperative blood pressure control is essential for anesthesiologists and intensivists. However, studies specific to noncardiac surgery are limited. Therefore, we aimed to evaluate the effects of postoperative norepinephrine and dopamine on clinical outcomes in adult noncardiac surgery patients by analyzing a nationwide intensive care patient database.Methods: The Japanese Intensive care PAtient Database (JIPAD) was used for this multicenter retrospective study. Adult patients in the JIPAD who received norepinephrine or dopamine within 24 h after noncardiac surgery in 2018–2020 were included. We compared the norepinephrine and dopamine groups using a one-to-one propensity score matching analysis. The primary outcome was in-hospital mortality. Secondary outcomes were intensive care unit (ICU) mortality, hospital length of stay, and ICU length of stay.Results: A total of 6,236 eligible patients from 69 ICUs were allocated to the norepinephrine (n = 4,652) or dopamine (n = 1,584) group. Propensity score matching was used to create a matched cohort of 1,230 pairs. No differences in the in-hospital mortality was found between the two propensity score matched groups (risk difference: 0.41%, 95% CI [−1.15, 1.96], P = 0.608). Among the secondary outcomes, only the ICU length of stay was significantly shorter in the norepinephrine group than in the dopamine group (median length: 3 vs. 4 days, respectively; P < 0.001).Conclusions: In adult patients after noncardiac surgery, norepinephrine was not associated with decreased mortality but was associated with a shorter ICU length of stay than dopamine.
Evidence of Weak Decay of Heavy Double Hypernuclei
Aoki, S.,Bahk, S. Y.,Chung, K. S.,Chung, S. H.,Funahashi, H.,Hahn, C. H.,Hara, T.,Hirata, S.,Hoshino, K.,Ieiri, M.,Iijima, T.,Imai, K.,Ishigami, T.,Itow, Y.,Kazuno, M.,Kikuchi, K.,Kim, C. O.,Kim, D. C 國立昌原大學校 基礎科學硏究所 1992 基礎科學硏究所論文集 Vol.3 No.-
We have studied 80 events of candidates for ??? capture star at rest in nuclear emulsion, where ??? hyperons are produced in (??????) reactions identified by a ?? spectrometer. The weak decay of heavy double hypernuclei is confirmed, studying the distribution of visible energy-release and the probability of emission of two fast protons, in comparison with those for single hypernuclei.
Aoki, Mai,Sato, Yukio,Teranishi, Ryo,Kaneko, Kenji Korean Society of Microscopy 2018 Applied microscopy Vol.48 No.1
Barium titanate ($BaTiO_3$) nanoparticle is one of the most promising materials for future multi-layer ceramic capacitor and ferroelectric random access memory. It is well known that electrical property of nanoparticles depends on the atomistic structure. Although surface may possibly have an impact on the atomistic structure, reconstructed structure at the surface has not been widely investigated. In the present study, Ba-ion position near surface in a $BaTiO_3$ nanoparticle has been quantitatively characterized by scanning transmission electron microscopy. It was found that some Ba ions at the surface were greatly displaced in non-uniform directions.
Hydrogen Absorption and Desorption in Ti-Al Alloys
Aoki, K .,Ishikawa, K .,Hashi, K . 대한금속재료학회(대한금속학회) 2001 METALS AND MATERIALS International Vol.7 No.2
Binary Ti_(1-x)Al_x and ternary Ti_(.075-x)Al_(0.25)M_x (M=V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, Mo, Pd, Hf, Ta and W; x=0.15 and 0.25) alloys reacted slowly with 5.0 ㎫ Hz at room temperature for different periods. The hydrogen absorption capacity, the 50% hydrogen desorption temperature (T_d) and the structures of their hydride were investigated. Amorphous and fcc type hydrides formed by hydrogenation of the binary Ti-Al alloys. As the Al concentration increased in the Ti-Al alloys, the hydrogen absorption capacity decreased, while the hydrogen desorption temperature decreased at once and then increased again. Amorphous, fcc, bcc and C14 Laves type hydrides formed by hydrogenation of the ternary Ti₃Al- based alloys. The hydrogen absorption capacity was reduced despite whatever elements were substituted for Ti in Ti₃Al. Ni, Co, Mn and Nb have the ability to reduce T_d of Ti_(.075-x)Al_(0.25)M_x.
The Concept of the 'Launching State' Revisited
Aoki, Setsuko 한국항공우주법학회 2002 한국항공우주정책·법학회지 Vol.15 No.-
Commercialization and privatization of outer space has been developing to the extent that public space law regime established at the UN seems to be somewhat incompatible with the today's commercial launching services. Thus, this paper analyzes, at first, the UN space treaties to specify the obstacles for promoting commercial use. The necessity of some covert amendment of UN treaties is suggested through the national space legislation. Then three state practices are examined to propose a new concept of the "launching state" including the Sea Launch project, since the concept of the "launching state" is of the major importance to enact an effective national act to better accommodate UN space treaties to the present necessity.
Generation of monoclonal antibodies specific for ORF68 of koi herpesvirus
Aoki, T.,Takano, T.,Unajak, S.,Takagi, M.,Kim, Y.R.,Park, S.B.,Kondo, H.,Hirono, I.,Saito-Taki, T.,Hikima, J.i.,Jung, T.S. Pergamon Press 2011 Comparative immunology, microbiology and infectiou Vol.34 No.3
Outbreaks of koi herpesvirus (KHV) infection in carp are still a serious problem worldwide. KHV is closely related to other two cyprinid herpesviruses, pox herpesvirus (CHV) and haematopoietic necrosis herpesvirus (CyHV-2) in goldfish. In this study, two major KHV antigenic proteins (ORF62 and ORF68) were identified by immunoscreening using a KHV-specific polyclonal antibody, and then monoclonal antibodies were generated for immunodiagnostic studies. After screening hybridoma cells, one mAb against ORF68 (mAb-7C6) was obtained but no mAbs against ORF62. mAb-7C6 specifically reacted with a lysate of KHV-infected koi fin cells (KF-1 cells) but not with lysates of CHV- or CyHV-2-infected KF-1 cells in an immuno-blotting analysis. Similar results were shown in the following tests: (1) a indirect fluorescent antibody test using infected KF-1 cells and (2) an immunohistochemical investigation by fast red stain (infected liver) or FITC detection (infected spleen). These results suggested that mAb-7C6 specifically reacts with KHV ORF68 protein.
Damage propagation in CFRP laminates subjected to low velocity impact and static indentation
Aoki, Yuichiro,Suemasu, Hiroshi,Ishikawa, Takashi The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.1
This paper describes a damage accumulation mechanism in cross-ply CFRP laminates $[0_2/90_2]_{2S}$ subjected to out-of-plane loading. Drop-weight impact and static indentation tests were carried out, and induced damage was observed by ultrasonic C-scan and an optical microscope. Both tests gave essentially the same results for damage modes, sizes, and load-deformation history. First, a crack occurred in the bottom $0^{\circ}$ layer accompanying some delamination along the crack caused by bending stress. Then, transverse cracks occurred in the middle $90^{\circ}$ layer with decreasing contact force between the specimen and the indenter. Measured local strains near the impact point showed that the stress state changed from a bending dominant state to an in-plane tensile dominant state. A cohesive interface element was used to simulate the propagation of multiple delaminations and transverse cracks under static indentation. Two types of analytical models are considered, one with multiple delaminations and the other with both multiple delaminations and transverse cracks. The damage obtained for the model with only multiple delaminations was quite different from that obtained from the experiment. However, the results obtained from the model with both delaminations and transverse cracks well explain the characteristics of the damage obtained in the experiment. The existence of the transverse cracks is essential to form the characteristic impact damage.