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Stability of phases in (Ba, Gd)MnO_3 solid solution system

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Journal of Rare Earths 2008年第2期26卷 233-236页

作者： Migaku Kobayashi Hidenori Tamura Hiromi Nakano Hirohisa Satoh naoki Kamegashira Department of Chemistry and Biochemistry Numazu National College of Technology 3600 Ooka Numazu Electron Microscope Laboratory Ryukoku University Department of Materials Science Toyohashi University of Technology Tempaku-cho

The existing phases in BaxGd1-xMnO3 solid solution system （0≤x≤ 1） were studied by analyzing the detailed crystal structure of each composition from the results of the Rietveld method using powder X-ray diffraction data. For a small substitution of Ba for Gd （0≤x〈0. 1）, the orthorhombic phase with a perovskite type structure （Pnma space group） was stably formed and this fact was supported by the electron diffraction data. There existed an intermediate phase of Ba0.33Gd0.67MnO3, which was characterized as the tetragonal phase with perovskite structure. The composition range of this phase was narrow and almost line compound. Between the regions of these phases, there existed two-phase region. There was also a two-phase region between the intermediate tetragonal phase and BaMnO3. Measurement of electrical conductivities of these orthorhombic solid solutions and tetragonal phases showed semiconducting behaviors for both phases and the existence of the phase transition at high temperature for the orthorhombic phase, The transition temperature decreased as the Ba content increased.

关键词： rare earth manganite phase behavior X-ray diffractometry crystal structure electrical conductivity

Calibration of Modified Spalart-Allmaras Model Parameters for Linear Compressor Cascade Corner Flow

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Journal of Thermal Science 2022年第1期31卷 163-172页

作者： MATSUI Kotaro PEREZ Ethan KELLY T.Ryan TANI naoki JEMCOV Aleksandar IHI Corporation Notre Dame Turbomachinery Laboratory Department of Aerospace and Mechanical Engineering University of Notre Dame

In this study, Bayesian parameter calibration is applied to Saplart-Allmaras(SA) turbulence model, and the prediction improvement by the calibrated model is demonstrated. The quantity of interest(QOI) is the pitch-wise distribution of Mach number in the corner separation flow region. The 10 model parameters included in the SA model with Rotation-Curvature correction are considered as random variables obeying uniform prior probability distributions. The order of generalized Polynomial Chaos(g PC) used for sensitivity analysis and surrogate model in calibration is incrementally increased during the calibration process. Posterior convergence is obtained at the 3 rd order expansion level in this study. At this final level, sensitivity analysis indicates 3 model parameters, cb1, κ and cr3 are the most influential random variables, and 3-parameter Bayesian calibration is conducted. The likelihood function in the Bayesian theorem is specified in the form of Gaussian distribution, including experimental uncertainty. The combination of prior and likelihood brings the posterior distribution of model parameters, and Maximum A Posterior(MAP) value is selected as a calibrated parameter set. The flow simulation with calibrated parameters shows a significant increase in the accuracy of the Mach number profile in the corner separation region. The increase in accuracy is attributed to enlarged turbulent viscosity due to the parameter modification of the turbulent viscosity source term. The calibrated parameter is also tested in the off-design flow field, not included in the calibration process. The calibrated CFD again shows improved accuracy for corner separation prediction, and the effectiveness of the parameter set outside of the calibration field is demonstrated.

关键词： compressor corner flow turbulence model calibration

Influence of viscosity on chondrogenic differentiation of mesenchymal stem cells during 3D culture in viscous gelatin solution-embedded hydrogels

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Journal of Materials Science & Technology 2021年第4期63卷 1-8页

作者： Kyubae Lee Yazhou Chen Xiaomeng Li naoki Kawazoe Yingnan Yang Guoping Chen Research Center for Functional Materials National Institute for Materials Science1-1 NamikiTsukubaIbaraki305-0044Japan Department of Materials Science and Engineering Graduate School of Pure and Applied SciencesUniversity of Tsukuba1-1-1 TennodaiTsukubaIbaraki305-8577Japan School of Mechanics and Engineering Science Zhengzhou UniversityZhengzhou450001China Graduate School of Life and Environmental Science University of Tsukuba1-1-1 TennodaiTsukubaIbaraki305-8571Japan

Differentiation of human bone marrow-derived mesenchymal stem cells(hMSCs)is regulated by a variety of cues of their surrounding *** particular,mechanical properties of cell culture matrices have been recently disclosed to play a pivotal role in stem cell ***,it remains elusive how viscosity affects the chondrogenic differentiation of hMSCs during three-dimensional(3 D)*** this study,a 3 D culture system that was established by embedding viscous gelatin solution in chemically cross-linked gelatin hydrogels was used for 3 D culture of hMSCs in gelatin solutions with different *** influence of solution viscosity on chondrogenic differentiation of hMSCs was *** gelatin solutions promoted cell proliferation in the order of low,middle and high viscosity while elastic hydrogels restricted cell *** viscosity gelatin solution led to increased production of the cartilaginous *** the synergistic stimulation of chondrogenic induction factors,high viscosity was beneficial for the chondrogenic differentiation of *** results suggested the role of viscosity should be considered as one of the dominant mechanical cues affecting stem cell differentiation.

关键词： viscosity culture stimulation

Reproductive farming technology in Japanese eel and chub mackerel

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Aquaculture and Fisheries 2022年第5期7卷 595-600页

作者： Hiroshi Miyanishi naoki Nagano Department of Marine Biology and Environmental Sciences Faculty of AgricultureUniversity of MiyazakiMiyazaki889-2192Japan Department of Marine Biology and Environmental Sciences Faculty of AgricultureUniversity of Miyazaki1-1 Gakuen-kibanadai-nishiMiyazaki 889-2192Japan

Japanese eel(Anguilla japonica)and chub mackerel(Scomber japonicus)are commercially valuable species in Asian *** reduction in eel and chub mackerel resources has been a serious problem in recent years that should be addressed by reducing the catch of their natural populations to halt their decline and reach the Sustainable Development ***,securing sufficient food supply by aquaculture is an important step in addressing the increasing demand for fish products in recent ***,juveniles of the Japanese eel and chub mackerel have been captured to be raised in *** to the extensive research on these species,new technologies have been developed for full-lifecycle aquaculture of Japanese eel in 2011 and chub mackerel in *** technologies are expected to stop the decline of natural resources and provide a stable food ***,seed production of these species has increased owing to the development of successful broodstock management and larval rearing *** information on oocyte maturation and ovulation and its application for artificial induction of sexual maturation is needed to produce good quality seeds of the Japanese eel and chub ***,hormonal mechanisms and previously and newly developed methods for artificial seed production have been described.

关键词： Japanese eel Chub mackerel Full-lifecycle aquaculture Hormonal maturation Saccus vasculosus

Excited-state conformation capture by supramolecular chains towards triplet-involved organic emitters

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Chinese Chemical Letters 2021年第5期32卷 1669-1674页

作者： Hao Liu naoki Ando Shigehiro Yamaguchi Pance Naumov Hongyu Zhang State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China Department of Chemistry Graduate School of Scienceand Integrated Research Consortium on Chemical Sciences(IRCCS)Nagoya UniversityFuro ChikusaNagoya 464-8602Japan Institute of Transformative Bio-Molecules(WPI-ITbM) Nagoya UniversityFuro ChikusaNagoya 464-8602Japan New York University Abu Dhabi PO Box 129188Abu DhabiUnited Arab Emirates

Nowadays,the development of trip let-involved materials becomes a hot research topic in solid-state luminescence ***,the mechanism of trip let-involved emission still remains some mysteries to ***,we proposed a new concept of excited-state confo rmation capture for the const ructio ns of different types of trip let-involved ***,excited-state conformation could be trapped by supramolecular chains in crystal and fo rm a new optimum excited-state structure which is different from that in solution or simple rigid environment,leading to bright thermally activated delayed fluorescence(TADF) *** on excited-state conformation capture methodology,next,we obtained roomtemperature phosphorescence(RTP) by introducing Br atoms for the enhancement of intersystem *** could be concluded from experime ntal results that TADF may originate from aggregate effect while RTP may derive from ***,heavy-atom free RTP and ultra RTP were achieved by eliminating aggregate *** wo rk could not only exte nd the design methodology of triplet-involved materials but also set clear evidences for the mechanism of triplet-involved emissions.

关键词： Room-temperature phosphorescence Supramolecular chains Conformation capture Organic emitters Triplet-involved emission

Comparison of percutaneous transhepatic portal vein embolization and unilateral portal vein ligation

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World Journal of Gastroenterology 2012年第19期18卷 2371-2376页

作者： Hiroya Iida Tsukasa Aihara Shinichi Ikuta Hidenori Yoshie naoki Yamanaka Department of Surgery Meiwa Hospital 4-31 Agenaruo-choNisinomiyaHyogo 663-8186Japan

AIM： To compare the effect of percutaneous transhepatic portal vein embolization （PTPE） and unilateral portal vein ligation （PVL） on hepatic hemodynamics and right hepatic lobe （RHL） atrophy.METHODS： Between March 2005 and March 2009, 13 cases were selected for PTPE （n = 9） and PVL （n = 4） in the RHL. The PTPE group included hilar bile duct carcinoma （n = 2）, intrahepatic cholangiocarcinoma （n = 2）, hepatocellular carcinoma （n = 2） and liver metastasis （n = 3）. The PVL group included hepatocellular carcinoma （n = 2） and liver metastasis （n = 2）. In addition, observation of postoperative hepatic hemodynamics obtained from computed tomography and Doppler ultrasonography was compared between the two groups.RESULTS： Mean ages in the two groups were 58.9 ± 2.9 years （PVL group） vs 69.7 ±3.2 years （PTPE group）, which was a significant difference （P = 0.0002）. Among the indicators of liver function, including serum albumin, serum bilirubin, aspartate aminotransferase, alanine aminotransferase, platelets and indocyanine green retention rate at 15 min, no significant differ- ences were observed between the two groups. Preop-erative RHL volumes in the PTPE and PVL groups were estimated to be 804.9 ±181.1 mL and 813.3 4±129.7 mL, respectively, with volume rates of 68.9% ± 2.8% and 69.2% ±4.2%, respectively. There were no significant differences in RHL volumes （P = 0.83） and RHL volume rates （P = 0.94）, respectively. At 1 mo after PTPE or PVL, postoperative RHL volumes in the PTPE and PVL groups were estimated to be 638.4±153.6 mL and 749.8 ± 121.9 mL, respectively, with no significant difference （P = 0.14）. Postoperative RHL volume rates in the PTPE and PVL groups were estimated to be 54.6% ± 4.2% and 63.7% ± 3.9%, respectively, which was a significant difference （P = 0.0056）. At 1 mo after the operation, the liver volume atrophy rate was 14.3% ± 2.3% in the PTPE group and 5.4%± 1.6% in the PVL group, which was a significant difference （P = 0.0061）.CONCLUSION： PTPE is a

关键词： Percutaneous transhepatic portal vein em-bolization Portal vein ligation Liver atrophy Futureliver remnant Two-stage hepatectomy

Argyrophilic grain disease is common in older adults and may be a risk factor for suicide:a study of Japanese forensic autopsy cases

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Translational Neurodegeneration 2023年第1期12卷 654-665页

作者： Koji Yoshida Yukiko Hata Shojiro Ichimata Keitaro Okada naoki Nishida Department of Legal Medicine Faculty of MedicineUniversity of Toyama2630 SugitaniToyama-shiToyama 930-0194Japan Tanz Centre for Research in Neurodegenerative Disease Krembil Discovery TowerUniversity of Toronto60 Leonard Ave Toronto OnTorontoON M5T 0S8Canada Department of Laboratory Medicine and Pathobiology University of TorontoTorontoONCanada.

Background Neuropathological diagnosis of argyrophilic grain disease(AGD)is currently based primarily on the combination of argyrophilic grain(AG)visualized using Gallyas-Braak silver staining,phosphorylated tau-positive pretangles,coiled bodies,and ballooned neuron *** AGD is common in patients with dementia and/or prominent psychiatric symptoms,whether it is a distinct neurological disease entity or a by-product of the aging process remains *** In 1449 serial forensic autopsy cases>40 years old(823 males and 525 females,aged 40-101 years,mean age 70.0±14.1 years),we examined the frequency and comorbid pathology of AGD cases and investigated the clini-cal appearance by comparing those with non-AGD cases using the propensity *** Of the 1449 cases,we detected 342 AGD cases(23.6%;mean age 79.7 years;177 males and 165 females).The AGD frequency and stage increased with age(P<0.001).Among AGD cases,80(23.4%)patients had dementia,and 51(15.2%)had a history of psychiatric hospital *** frequency of suicide and history of psychiatric disorders were significantly higher in AGD cases than in AGD-negative cases,matched for age,sex,and comorbidity pathol-ogy,with a relative risk of suicide of 1.72(1.30-2.26).The frequency of suicide was significantly higher in AGD cases than in non-AGD cases in female but not male *** relative risk of suicide increased to 2.27(1.20-4.30)and 6.50(1.58-26.76)in AGD patients with Lewy and progressive supranuclear palsy pathology,respectively,and decreased to 0.88(0.38-2.10)in those with advanced AD *** AGD cases,23.4%had dementia;however,the difference was not significant after controlling for age,sex,and comorbid *** Our study demonstrated that AGD is a significant and isolated risk factor for psychiatric hospital visits and suicide *** older adults,AGs may contribute to the progression of functional impairment of the limbic system,which leads to psychiatric dis

关键词： Amygdala Argyrophilic grains Dementia Forensic autopsy Psychiatric disorder Suicide

Facile and Scalable Synthesis of a Highly Hydroxylated Water-Soluble Fullerenol as a Single Nanoparticle

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Nano Research 2011年第2期4卷 204-215页

作者： Ken Kokubo Shogo Shirakawa naoki Kobayashi Hisae Aoshima Takumi Oshima Division of Applied Chemistry Graduate School of Engineering Osaka University Suita Osaka 565-0871 Japan Vitamin C60 BioResearch Corporation 1-3-19 Yaesu Chuo-ku Tokyo 103-0028 Japan

A water-soluble polyhydroxylated fullerene, i.e., a fullerenol, with 44 hydroxyl groups and 8 secondary bound water molecules, C60（OH）44·8H2O （estimated average structure）, has been synthesized in a facile one step reaction from pristine C60 by hydroxylation with hydrogen peroxide in the presence of a phase-transfer catalyst, tetra-n-butylammonium hydroxide （TBAH）, under organic/aqueous bilayer conditions. The fullerenol exhibited high water solubility, up to 64.9 mg/mL, under neutral （pH = 7） conditions. Dynamic light-scattering （DES） analysis showed a narrow particle size distribution, of 1-2 nm, indicating that the fullerenol had high dispersion properties in water. The results of particle size analyses, which botll focused on a single nanoregion and were conducted using a novel induced grating （IG） method and a scanning probe microscope （SPM）, were consistent with the DES results. A plausible reaction mechanism, which includes fullerene oxide intermediates detected by liquid chromatography-mass spectrometry （LC-MS）, has been proposed.

关键词： Fullerene fullerenol hydroxyl group nanoparticle water solubility

Microstructural analyses of all-solid-state Li–S batteries using LiBH4-based solid electrolyte for prolonged cycle performance

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Journal of Energy Chemistry 2020年第11期29卷 424-429页

作者： Kazuaki Kisu Sangryun Kim Ryuga Yoshida Hiroyuki Oguchi naoki Toyama Shin-ichi Orimo Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversityKatahira 2-1-1Aoba-kuSendai 980-8577Japan Institute for Materials Research(IMR) Tohoku UniversityKatahira 2-1-1Aoba-kuSendai 980-8577Japan

Complex hydride materials have been widely investigated as potential solid electrolytes because they have good compatibility with the lithium metal anodes used in all-solid-state batteries. However, the development of all-solid-state batteries utilizing complex hydrides has been difficult as these cells tend to have short cycle lives. This study investigated the capacity fading mechanism of all-solid-state lithium–sulfur(Li–S) batteries using Li4(BH4)3I solid electrolytes by analyzing the cathode microstructure. Crosssectional scanning electron microscopy observations after 100 discharge–charge cycles revealed crack formation in the Li4(BH4)3I electrolyte and an increased cathode thickness. Raman spectroscopy indicated that decomposition of the Li4(BH4)3I solid electrolyte occurred at a constant rate during the cycling *** combat these effects, the cycle life of Li–S batteries was improved by increasing the amount of solid electrolyte in the cathode.

关键词： All-solid-state battery Complex hydride solid electrolyte Li metal anode Li–S battery Microstructure