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High-spin structure in ^(187)Pt

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Science China(Physics,mechanics & Astronomy) 2008年第8期51卷 1053-1071页

作者： OSHImA m TOH y KOIZUmI m OSA A HATSUKAWA y SUGAWARA m japan Atomic Energy Agency TokaiIbaraki 319-1195Japan Chiba Institute of Technology NarashinoChiba 275-0023Japan

High-spin states in 187Pt were studied via the 173yb(18O,4n) reaction. Rotational bands based on the νi13/2,ν7/2-[503],νi213/2νj,ν3/2-[512] and ν1/2-[521] configurations were observed,and interpreted within the framework of the cranked shell model. The TRS calculations show that the νi13/2 band has an appreciable negative γ deformation,and the negative-parity bands tend to have a near prolate shape with small positive γ values. Experimental values of B(m1) /B(E2) ratios have been extracted and compared with theoretical values from the semi-classical D-nau and Frauendof approach,strongly suggesting a low frequency πh9/2 alignment in the ν7/2-[503] band.

关键词： rotational band configuration shape coexistence

Characterization for Fusion Candidate Vanadium Alloys

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Plasma Science and Technology 2004年第4期6卷 2395-2399页

作者： T.muroga T.Nagasaka j.m.Chen Z.y.Xu Q.y.Huang y.C.Wu NationalInstituteforFusionScience Toki509-5292Japan SouthwesternInstituteofPhysics Chengdu610041China InstituteofPlasmaPhysics ChineseAcademyofSciencesHefei230031China

This paper summarizes recent achievements in the characterization ofcandidate vanadium alloys obtained for fusion in the framework of the japan-China Core UniversityProgram. National Institute for Fusion Science (NIFS) has a program of fabricating high-purityV-4Cr-4Ti alloys. The resulting products (NIFS-HEAT-1,2), were characterized by various researchgroups in the world including Chinese partners. South Western Institute of Physics (SWIP) fabricateda new V-4Cr-4Ti alloy (SWIP-Heat), and carried out a comparative evaluation of hydrogenembrittlement of NIFS-HEATs and SWIP-Heat. The tensile test of hydrogen-doped alloys showed that theNIFS-HEAT maintained the ductility to relatively high hydrogen levels. The comparison of the datawith those of previous studies suggested that the reduced oxygen level in the NIFS-HEATs should beresponsible for the increased resistance to hydrogen embrittlement. Based on the chemical analysisdata of NIFS-HEATs and SWIP-Heats, neutron-induced activation was analyzed in Institute of PlasmaPhysics (IPP-CAS) as a function of cooling time after the use in the fusion first wall. The resultsshowed that the low level of Co dominates the activity up to 50 years followed by a domination of Nbor Nb and Al in the respective alloys. It was suggested that reduction of Co and Nb, both of whichare thought to have been introduced via cross-contamination into the alloys from the molds usedshould be crucial for reducing further the activation.

关键词： vanadium alloys characterization nuclear fusion

Schottky photodiode using submicron thick diamond epilayer for flame sensing

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Nano-micro Letters 2009年第1期1卷 30-33页

作者： y.Koide m.y.Liao j.Alvarez m.Imura K.Sueishi F.yoshifusa Sensor materials Center (SenmC) National Institute for Materials Science (NIMS) Laboratoire de Génie Electrique de Paris (UmR 8507 CNRS) Ecole Supérieure d’Electricité Universités Paris VI et Paris XI International Center for materials Nanoarchitectonics (mANA) National Institute for Materials Science (NIMS) ANTEC Co.

The sensing of a flame can be performed by using wide-bandgap semiconductors, which offer a high signal-to-noise ratio since they only response the ultraviolet emission in the flame. Diamond is a robust semiconductor with a wide-bandgap of 5.5 e V, exhibiting an intrinsic solar-blindness for deep-ultraviolet(DUV) detection. In this work, by using a submicron thick boron-doped diamond epilayer grown on a type-Ib diamond substrate, a Schottky photodiode device structure- based flame sensor is demonstrated. The photodiode exhibits extremely low dark current in both forward and reverse modes due to the holes depletion in the epilayer. The photodiode has a photoconductivity gain larger than 100 and a threshold wavelength of 330 nm in the forward bias mode. CO and OH emission bands with wavelengths shorter than 330 nm in a flame light are detected at a forward voltage of-10 V. An alcohol lamp flame in the distance of 250 mm is directly detected without a focusing lens of flame light.

关键词： Flame sensing Boron-doped diamond Schottky photodiode

Compression Stability of Reversed Austenite in 9Ni Steel

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journal of materials Science & Technology 2012年第6期28卷 558-561页

作者： S.H.Chen m.j.Zhao X.y.Li L.j.Rong Institute of metal Research Chinese Academy of SciencesShenyang 110016China

The effect of compressive stress on the stability of reversed austenite in gNi steel was investigated by uni- axial and hydrostatic compression. It was found that the uniaxial compressive pressure promoted the Υ-α transformation, while the hydrostatic pressure suppressed the -Υ-α transformation. The pressure dependent transformation behavior can be explained according to thermodynamic analysis.

关键词： 9Ni steel martensite Reversed austenite Hydrostatic pressure Uniaxial compressive pressure

Experimental and numerical investigation of buckling in rectangular steel plates with groove-shaped cutouts

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journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第6期13卷 469-480页

作者： y. Faradjian mOHTARAm j. Taheri KAHNAmOUEI m. SHARIATI B. BEHjAT mechanical Department Islamic Azad University Bostan Abad Branch Iran mechanical Department Shahrood University of Technology Shahrood Iran mechanical Department Sahand University of Technology Tabriz Iran

Steel plates are widely used in various structures, such as the deck and bodies of ships and bridges, and in the aerospace industry. In many instances, these plates are subjected to axial compression loads that predispose the sheets to instability and buckling. In this study, we investigate the buckling and post-buckling behaviors of steel plates having groove-shaped cutouts of various dimensions and angles using finite element method (FEm) (by ABAQUS software) and experimental tests (by an Instron servohydraulic machine). Boundary conditions were clamped by supports at upper and lower ends and free supports at the other edges. The results of both numerical and experimental analyses are compared, which show a very good agreement between them. Finally, based on the experimental findings, formulas are presented for the determination of the buckling load of such plates.

关键词： Buckling Steel plates Cutout Experimental analysis Finite element method (FEm)

First-principles Study of Point Defects in Stoichiometric and Non-stoichiometric y_4Al_2O_9

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journal of materials Science & Technology 2013年第12期29卷 1161-1165页

作者： Z.Li B.Liu j.m.Wang L.C.Sun j.y.Wang y.C.Zhou Z.j.Hu High-performance Ceramics Division Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of Sciences Aerospace Research Institute of materials and Processing Technology

By using the first-principles calculation, we studied the mechanisms of point defects in y4AI209 （yAm）, a promising ternary oxide with excellent optical and thermal properties. It is found that the predominant native defect species is closely dependent on the chemical potentials of each constituent. In the case of O-rich condition, the oxygen interstitial has the very low defect formation energy, followed by the anti-site defects and AI vacancy; in the case of AI-rich condition, the oxygen vacancy yields the lowest defect formation energy, followed by the anti-site defects and AI interstitial. The present result shows that in all the possible chemical potential ranges, anti-site defects have relatively low defect formation energy and might exist in high concentration in yAm. Furthermore, AIy anti-site has relatively lower defect formation energy than the yAt anti- site throughout. The behaviors of defect complexes under non-stoichiometric condition, such as the AI203 or y203 excess, are also investigated. The results provide helpful guide to optimize the experimental synthesizing of yAm.

关键词： Ternary y-AI-O oxide Defect formation energy Chemical potential

Synthesis,spectroscopic characterization and thermal studies of some lanthanide(Ⅲ) nitrate complexes with a hydrazo derivative of 4-aminoantipyrine

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journal of Rare Earths 2009年第5期27卷 705-710页

作者： K.mohanan C.j.Athira y.Sindhu m.S.Sujamol Department of Chemistry University of Kerala

A heterocyclic ligand synthesized by the coupling of diazotized 4-aminoantipyrine with acetylacetone reacted with lanthanide(Ⅲ) nitrate to form complexes of the type [Ln(HAAP)2(NOз)з] where, Ln=La(Ⅲ), Ce(Ⅲ), Pr(Ⅲ), Nd(Ⅲ), Sm(Ⅲ), or Gd(Ⅲ) and HAAP=3-{[2-(N-1-phenyl-2,3-dimethylpyrazol-3-in-5-on-4-yl)]hydrazone}pent-2,3,4-trione. The ligand and metal complexes were characterized on the basis of elemental analysis, molar conductance, magnetic susceptibility measurements, UV-Visible, infrared, far infrared and proton NmR spectral data. The spectral data revealed that the ligand existed in the hydrazo form and coordinated to the metal ion without deprotonation in a neutral tridentate manner, through carbonyl oxygen of pyrazolone ring, hydrazo nitrogen and carbonyl oxygen of the acetylace-tone moiety. The molar conductance values adequately supported their non-electrolytic nature. The ligand and the praseodymium(Ⅲ) complex were subjected to X-ray diffraction studies. Thermal decomposition behavior of the lanthanum(Ⅲ) complex was also examined.

关键词： 4-aminoantipyrine acetylacetone lanthanides thermogravimetry X-ray diffraction rare earths

Finite Element Analysis of Push-Out Test of SiC Fiber Reinforced Titanium matrix Composites

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稀有金属材料与工程 2009年第A03期38卷 50-53页

作者： yuan m N yang y Q Huang B Zhang R j School of materials Northwestern Polytechnical University Xi＇an 710072 China

Based on the interphase layer model and the spring layer model, an improved interface model was developed to evaluate the interfacial shear strength of Titanium matrix composites(TmCs) and to analyze the effects of various parameters on the interfacial properties. The results showed that the improved interface model is more suitable for calculating the interfacial properties of SiC fiber reinforced titanium matrix composites. The interfacial shear strength of SiC/Timetal-834 predicted is 500 mPa. In addition, in order to better understand the interfacial properties of composites, some push out phenomenon were analyzed.

关键词：复合材料剪切强度碳化硅纤维物理性能

Structures and formation mechanisms of dislocation-induced precipitates in relation to the age-hardening responses of Al-mg-Si alloys

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journal of materials Science & Technology 2020年第6期41卷 127-138页

作者： y.X.Lai W.Fan m.j.yin C.L.Wu j.H.Chen Center for High-Resolution Electron microscopy College of Materials Science&EngineeringHunan UniversityChangsha 410082China Electron microscopy Center Shenzhen UniversityShenzhen 518060China

In the slightly deformed Al-mg-Si alloys,dislocation-induced precipitates are frequently observed,and they usually line up,forming sophisticated precipitation *** atomic-resolution electron microscopy in association with hardness measurements,we systematically investigated these precipitates in relation to the age-hardening responses of the *** study reveals that the majority of dislocation-induced complex precipitates are actually short-range ordered while long-range disordered polycrystalline precipitates and multiphase composite precipitates,including polycrystalline U2 precipitates,B’/U2,B’-2/U2,B’/B’-2/U2 and’/U2 composite *** is suggested that the formation of these complex precipitates is mainly owing to a high nucleation rate and rapid growth of different precipitate phases parallel to the associated dislocation *** dislocation-induced precipitates consume more mg than Si from the matrix and have a high formation kinetics,they will have different impacts on the matrix precipitation in different types of Al-mg-Si *** results further demonstrate that for the"normally-β"-hardened"alloy,their formation leads to a coarser precipitate microstructure in the matrix,whereas for the"normally-β’-hardened"alloy,their formation reverses the precipitation pathway in the matrix,resulting in a reduced age-hardening potential of the former alloy and an improved age-hardening potential of the latter alloy.

关键词： Al-mg-Si alloys Precipitation Dislocation Age-hardening Electron microscopy