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日本高强度声试验设备

导弹与航天运载技术 1983年第1期 88-94页

作者： T.Hidaka s.takagi M.Ueda 朱仲方

引言火箭和卫星发射之前,通常要进行如温度、湿度、振动和冲击等环境试验,以改进整个系统的可靠性。高强度的声试验即是其中的一种。国外,已经设计和建成了几种高强度声试验设备,并成功地投入了使用。火箭在起飞和最大动压飞行时会遇到... 详细信息

引言火箭和卫星发射之前,通常要进行如温度、湿度、振动和冲击等环境试验,以改进整个系统的可靠性。高强度的声试验即是其中的一种。国外,已经设计和建成了几种高强度声试验设备,并成功地投入了使用。火箭在起飞和最大动压飞行时会遇到严重的声环境。起飞时,噪声源就在火箭发动机的超音速排气流中。飞行期间,火箭外蒙皮紊流附面层里发生的压力脉动在最大动压时非常大。早期的高强度声试验利用火箭发动机和喷气发动机地面静态试验来模拟这些声环境。而

关键词：混响室声功率换能器声学实验室传感器测深仪倍频带倍频程最大声压级高强度试验设备实验室设备日本

Experimental and numerical study of buckling-restrained braces configured with out-of-plane eccentricity under cyclic loading

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Earthquake Engineering and Engineering Vibration 2024年第4期23卷 957-971页

作者： Cao, Yongsheng Zhou, Yun takagi, Jiro Jiang, Ke Deng, Xuesong Fang, Xiaojun Earthquake Engineering Research & Test Center Guangzhou University Guangzhou China Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology Guangzhou China Key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural Safety Ministry of Education Guangzhou China school of Civil Engineering Guangzhou University Guangzhou China Graduate school of Urban Environmental sciences Tokyo Metropolitan University Tokyo Japan Department of Civil and Natural Resources Engineering University of Canterbury Christchurch New Zealand

This study focuses on variations in the hysteretic behavior of buckling-restrained braces (BRBs) configured with or without out-of-plane eccentricity under cyclic loading. Quasi-static experiments and numerical simulations were carried out on concentrically and eccentrically loaded BRB specimens to investigate the mechanical properties, energy dissipation performance, stress distribution, and high-order deformation pattern. The experimental and numerical results showed that compared to the concentrically loaded BRBs, the stiffness, yield force, cumulated plastic ductility (CPD) coefficient, equivalent viscous damping coefficient and energy dissipation decreased, and the yield displacement and compression strength adjustment factor increased for the eccentrically loaded BRBs. With the existence of the out-of-plane eccentricity, the initial yield position changes from the yield segment to the junction between the yield segment and transition segment under a tensile load, while the initial high-order buckling pattern changes from a first-order C-shape to a second-order s-shape under a compressive load.

关键词： buckling-restrained brace out-of-plane eccentricity experiment numerical simulation mechanical properties

In situ observation of the phase transformation kinetics of bismuth during shock release

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Chinese Physics B 2024年第4期33卷 586-592页

作者：李江涛王倩男徐亮柳雷张航 sota takagi Kouhei Ichiyanagi Ryo Fukaya shunsuke Nozawa 胡建波 Laboratory for shock Wave and Detonation Physics Research Institute of Fluid PhysicsChina Academy of Engineering PhysicsMianyang 621900China state Key Laboratory for Environment-Friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China Japan society for the Promotion of science Tokyo102-0083Japan Institute of Materials structure science High Energy Accelerator Research OrganizationIbaraki305-8572Japan

A time-resolved x-ray diffraction technique is employed to monitor the structural transformation of laser-shocked *** reveal a retarded transformation from the shock-induced Bi-Ⅴphase to a metastable Bi-Ⅳphase during the shock release,instead of the thermodynamically stable Bi-Ⅲ*** emergence of the metastable Bi-Ⅳphase is understood by the competitive interplay between two transformation pathways towards the Bi-Ⅳand Bi-Ⅲ,*** former is more rapid than the latter because the Bi-Ⅴto B-Ⅳtransformation is driven by interaction between the closest atoms while the Bi-Ⅴto B-Ⅲtransformation requires interaction between the second-closest *** nucleation time for the Bi-Ⅴto Bi-Ⅳtransformation is determined to be 5.1±0.9 ns according to a classical nucleation *** observation demonstrates the importance of the formation of the transient metastable phases,which can change the phase transformation pathway in a dynamic process.

关键词： phase transformation time-resolved x-ray diffraction(XRD) bismuth metastable phase nonequilibrium phase diagram

Experimental and numerical study of buckling-restrained braces configured with out-of-plane eccentricity under cyclic loading

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Earthquake Engineering and Engineering Vibration 2024年第04期 957-971页

作者： Cao Yongsheng Zhou Yun takagi Jiro Jiang Ke Deng Xuesong Fang Xiaojun Earthquake Engineering Research&Test Center Guangzhou University Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology Key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural Safety Ministry of Education school of Civil Engineering Guangzhou University Graduate school of Urban Environmental sciences Tokyo Metropolitan University Department of Civil and Natural Resources Engineering University of Canterbury

This study focuses on variations in the hysteretic behavior of buckling-restrained braces(BRBs) configured with or without out-of-plane eccentricity under cyclic loading. Quasi-static experiments and numerical simulations were carried out on concentrically and eccentrically loaded BRB specimens to investigate the mechanical properties, energy dissipation performance, stress distribution, and high-order deformation pattern. The experimental and numerical results showed that compared to the concentrically loaded BRBs, the stiffness, yield force, cumulated plastic ductility(CPD) coefficient, equivalent viscous damping coefficient and energy dissipation decreased, and the yield displacement and compression strength adjustment factor increased for the eccentrically loaded BRBs. With the existence of the out-of-plane eccentricity, the initial yield position changes from the yield segment to the junction between the yield segment and transition segment under a tensile load, while the initial high-order buckling pattern changes from a first-order C-shape to a second-order s-shape under a compressive load.

关键词：

Orientation on the Mechanistics of Electron-Transfer on Oxidation of Chondroitin-4-sulfate as sustainable sulfated Polysaccharide by Permanganate Ion in Aqueous Perchlorate solutions

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Journal of Renewable Materials 2020年第2期8卷 205-218页

作者： Refat Hassan Hideo takagi samia Ibrahim Department of Chemistry Faculty of ScienceAssiut UniversityAssiut71516Egypt Department of Chemistry School of ScienceResearch Center of Materials ScienceNagoya464-01Japan Department of Chemistry Faculty of ScienceNew Valley UniversityEl-Kharga72511New ValleyEgypt

A spectrophotometric investigation of oxidation of chondroitin-4-sulfate(Cs)as a sustainable and biodegradable sulfated macromolecule by oxyanion permanganate ion as multi-equivalent oxidant in acid perchlorate solutions at a constant ionic strength of 2.0 mol dm^(-3)has been *** experimental results on the influence of the concentration of the reactants the reaction rates revealed first-order dependence in MnO^(-)_(4),fractional second-order in[Cs]and fractional first-order with respect to the hydrogen ion *** hydrogen acid concentration dependence of the rate constants indicated that the oxidation rates were increased with increasing the acid concentration which means that the oxidation reaction is of acid-catalyzed *** oxidation of all other polysaccharides by this oxidant in acidic solutions indicated that the oxidation processes were proceeding throughout two distinct *** first stage was relatively slow,followed by a more fast reaction in the second *** addition of Mn^(2+)and F^(-)ions to the reaction mixtures indicated that the Mn^(3+)and/or Mn^(4+)as the reduced forms of permanganate were the reactive species in the second fast ***,neither formation of Mn^(3+)and/or Mn^(4+)transient species nor presence of two stages in the oxidation reaction were detected in the oxidation process,and this result was found to be on contrary to that observed for oxidation of all other polysaccharides by this *** of 1:2 coordination biopolymer intermediate complexes prior to the rate-determining step was revealed,*** of the oxidation product revealed the formation of keto-acid as derivative precursor of Cs *** product was identified by formation of 2,4-dinitrophenyhydrazone and dioxime as wells as by the bands at frequencies 3430(OH of COOH group);1760-1730 cm^(-1)(broad)for C=O of diketone;1639 cm^(-1)ofν_(as),OCO;1418 cm^(-1)ofν_(s)OCO and 1338 cm^(-1)of C-O-C,respectively,in the

关键词： Chondroitin-4-sulfate permanganate oxidation electron-transfer kinetics mechanisms

Phototropin-and photosynthesis-dependent mitochondrial positioning in Arabidopsis thaliana mesophyll cells^FA

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Journal of Integrative Plant Biology 2020年第9期62卷 1352-1371页

作者： Md sayeedul Islam Toan Van Nguyen Wataru sakamoto shingo takagi Department of Biological sciences Graduate School of ScienceOsaka UniversityMachikaneyama-cho 1-1ToyonakaOsaka 560-0043Japan Agricultural Genetics Institute National Key Laboratory for Plant Cell BiotechnologyPham Van Dong roadBac Tu Liem districtHa NoiVietnam Institute of Plant science and Resources Okayama UniversityKurashikiOkayama 710-0046Japan

Mitochondria are frequently observed in the vicinity of chloroplasts in photosynthesizing cells, and this association is considered necessary for their metabolic in-teractions. We previously reported that, in leaf palisade cel s of Arabidopsis thaliana, mitochondria exhibit blue-light-dependent redistribution together with chloroplasts, which conduct accumulation and avoidance responses under the control of blue-light receptor phototropins. In this study, precise motility analyses by fluorescent micro-scopy revealed that the individual mitochondria in palisade cel s, labeled with green fluorescent protein, exhibit typical stop-and-go movement. When exposed to blue light, the velocity of moving mitochondria increased in 30 min, whereas after 4 h, the frequency of stoppage of mi-tochondrial movement markedly increased. Using different mutant plants, we concluded that the presence of both phototropin1 and phototropin2 is necessary for the early acceleration of mitochondrial movement. On the contrary, the late enhancement of stoppage of mitochondrial movement occurs only in the presence of phototropin2 and only when intact photosynthesis takes place. A plasma-membrane ghost assay suggested that the stopped mi-tochondria are firmly adhered to chloroplasts. These re-sults indicate that the physical interaction between mi-tochondria and chloroplasts is cooperatively mediated by phototropin2- and photosynthesis-dependent signals. The present study might add novel regulatory mechanism for light-dependent plant organel e interactions.

关键词： tropin Arabidopsis movement

Nanotwin-assisted nitridation of quenched FeNi alloy nanopowders for rare-earth-free magnets

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Journal of Materials science & Technology 2023年第34期165卷 244-252页

作者： Jian Wang Yusuke Hirayama Kazuyuki suzuki Kwangjae Park Zheng Liu Kenta takagi Kimihiro Ozaki Innovative Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology4-205SakurazakaMoriyamaNagoya463-8560Japan

L1_(0)-ordered FeNi alloy with a high uniaxial magnetic anisotropy and large magnetic moment is a promising candidate for rare-earth-free permanent magnets ***,the synthesis of this chemically ordered phase remains a longstanding challenge because of its low chemical order-disorder transition temperature(200-320℃).Although a non-equilibrium synthetic route based on a nitrogen topotactic reaction has been proposed as a valid approach,the volume fraction and degree of chemical ordering of the product phase are ***,we propose a promising approach that promotes the efficient formation of L1_(0)-ordered nitride phase in FeNi nanopowders by introducing a quenching treatment during a low-oxygen induction thermal plasma *** quenched FeNi nanopowders possessed much smaller powder sizes(40.4 vs 74.0 nm),exhibited higher number densities of nanotwins(39.8%vs 24.1%)and formed much larger volume fraction(33.6 wt.%vs 0.6 wt.%)of ordered phase than the unquenched ***,quenching-induced high-density nanotwins led to the dominant coverage of serrated{001}crystal facets over the surfaces of the FeNi *** unique features substantially accelerated the formation of the L1_(0)-ordered nitride phase in the FeNi nanopowders because the{001}crystallographic orientation had the highest nitrogen *** work provides not only a valid synthetic approach for mass production of the L10-ordered nitride phase in FeNi nanopowders but also novel insights into the crystal-defect-assisted nitridation of nanomaterials.

关键词： Rare-earth-free Permanent magnet FeNi Nitridation Nanotwin

Phenomenological aspects of possible vacua of a neutrino flavor model

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Chinese Physics C 2018年第2期42卷 27-37页

作者： Takuya Morozumi Hideaki Okane Hiroki sakamoto Yusuke shimizu Kenta takagi Hiroyuki Umeeda Graduate school of science Hiroshima University Core of Research for the Energetic Universe Hiroshima University Graduate school of science and Engineering Shimane University

We discuss a supersymmetric model with discrete flavor symmetry A4×Z3. The additional scalar fields which contribute masses of leptons in the Yukawa terms are introduced in this model. We analyze their scalar potential and find that they have various vacuum structures. We show the relations among 24 different vacua and classify them into two types. We derive expressions of the lepton mixing angles, Dirac CP violating phase and Majorana phases for the two types. The model parameters which are allowed by the experimental data of the lepton mixing angles are different for each type. We also study the constraints on the model parameters which are related to Majorana phases. The different allowed regions of the model parameters for the two types are shown numerically for a given region of two combinations of the CP violating phases.

关键词： flavor symmetry non-Abelian discrete group neutrino flavor model

Blue-light-induced rapid chloroplast de-anchoring in Vallisneria epidermal cells

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Journal of Integrative Plant Biology 2015年第1期57卷 93-105页

作者： Yuuki sakai shin-Ichiro Inoue Akiko Harada Ken-Ichiro shimazaki shingo takagi Department of Biological sciences Graduate School of Science Osaka University Division of Biological science Graduate School of Science Nagoya University Department of Biology Osaka Medical College Department of Biology Faculty of Science Kyushu University

In the outer periclinal cytoplasm of leaf epidermal cells of an aquatic angiosperm Vallisneria, blue light induces ＂chloroplast de-anchoring＂, a rapid decline in the resistance of chloroplasts against centrifugal force. Chloroplast de- anchoring is known induced within lmin of irradiation with high-fluence-rate blue light specifically, preceding the com- mencement of chloroplasts migration toward the anticlinal cytoplasm. However, its regulatory mechanism has remained elusive, although pharmacological analysis suggested that a calcium release from intracellular calcium stores is necessary for the response, in search of the responsible photoreceptors, immunoblotting analysis using antibodies against phototropins demonstrated that cross-reactive polypeptides of 120-kDa exist in the plasma-membrane fraction prepared from the leaves. In vitro phosphorylation analysis revealed that 120-kDa polypeptides were phosphorylated by exposure to blue light in a fluence-dependent manner. The blue-light-induced phosphorylation activity was sensitive to a ser/Thr kinase inhibitor, staurosporine, and unusually was retained at a high level for a long time in darkness. Furthermore, phototropin gene homologs （Vallisneria PHOTOTROPINI and PHOTOTROPIN2） expressed in leaves were isolated. We propose that calcium- regulated chloroplast de-anchoring, possibly mediated by phototropins, is an initial process of the blue-light-induced avoidance response of chloroplasts in Vallisneria.

关键词： Avoidance response of chloroplasts blue-light response chloroplast de-anchoring cytoplasmic calcium phototropin