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分子亚型参考标准的差异影响基于人工智能的动态增强MRI乳腺癌分型

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国际医学放射学杂志 2023年第3期 356-357页

作者： Y.Ji H.M.Whitney H.Li P.F.Liu M.L.Giger x.n.zhang 陈薪伊

摘要根据免疫组化（IHC）染色或包括Ki-67在内的St Gallen标准，乳腺癌可被分为不同的Luminal分子亚型。目的描述分子亚型，研究IHC和St Gallen分子亚型参考标准不

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Determination of the Gastric Cancer Characteristic Peaks in Laser-induced Autofluorescence Spectroscopy

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Determination of the Gastric Cancer Characteristic Peaks in ...

Landing gear noise control using perforated fairings

第三十五届国际光谱会议

作者： J.Ma~(1*) x.n.zhang~1 D.Teng~1 W.Z.Mao~2 R.E.Zheng~1 ~1Physics Department,Ocean University of China,Qingdao 266100,China ~2Department of General Surgery,Qingdao University Medical College Hospital,Qingdao 266100,China

＜正＞In the field of Laser-induced autofluorescence sepctrascopy（LIF）diagnosis,it doesn’t reach a consensus to regard the hematoporphyrin（PPIx）as the sign of gastric cancer for distinguishing normal and malignant gastric *** LIF study gives a certain proof that the autofluorescence of hematoporphyrin（PPIx）in～630 nm and～680 nm can be considered as the characteristic peaks for differentiating gastric cancer from the normal

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Acta Mechanica Sinica 2010年第2期26卷 159-174页

作者： K. Boorsma x. zhang n. Molin University of Southampton Southampton SO171BJ UK Airbus Operations S.A.S 316 Route de Bayonne 31060 Toulouse Cedex 03 France

Landing gears of commercial aircraft make an important contribution to total aircraft noise in the approach configuration. Using fairings to shield components from high speed impingement reduces noise. Furthermore, perforating these fairings has been confirmed by flight tests to further enable noise reduction. Following an earlier fundamental study of the application of perforated fairings, a study has been performed to investigate and optimize the benefits of bleeding air through landing gear fairings. By means of wind tunnel tests, an aerodynamic and acoustic survey has been performed on a simplified generic main landing gear to explore the influence of （perforated） fairings on the lower part of the gear. The results show that for this specific case, the application of impermeable fairings reduces noise in the mid- and high frequency range by shielding sharp edged components from high velocity impingement. However, below 1 kHz the noise is shown to increase significantly. Application of the perforations is shown to diminish this low frequency increase whilst maintaining the reduction in the mid- and high frequency range. The aerodynamic and acoustic measurements point in the direction of the separated flow of the fairings interacting with the downstream gear components responsible for the low frequency noise increase. Bleeding of the air through the fairings reduces the large scale turbulence in the proximity of these components and hence diminishes the low frequency noise increase.

关键词： Landing gear · Aerodynamics · Acoustics

MICROSTRUCTURE EVOLUTIOn AnD MECHAnICAL HARDEnInG OF HYPEREUTECTOID PEARLITIC STEEL DURInG COLD ROLLInG

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Acta Metallurgica Sinica(English Letters) 2007年第4期20卷 287-292页

作者： x. zhang C.x. Wang x.M. Liu Q.n. Shi Key Laboratory of Advanced Materials of Yunnan Province Kunming University of Science and Technology Kunming 650093 China Institute for Structural Materials Central Iron and Steel Research InstituteBeijing 100081 China

The microstructure evolution of different cold rolling reductions （from 0 to 81.6%） was studied by SEM （scanning electron microscopy） and TEM （transmission electron microscope）. The study showed that the orientation multiplicity of pearlitic lamellas resulted in inhomogeneous deformation of different pearlitic lamellas, and with the increase of reduction, the microstructure underwent a course of ＂homogeneity → inhomogeneity → homogeneity＂. The result of xRD （x-ray diffraction） analysis indicated that cementite did not decompose and dissolve into ferrite; the results of the mechanical property test suggested that the relationship between Rp0.2 （yield strength） and ε （true strain） was in good agreement with Hollomon relationship. With the equation Rp0.2 = 1465ε^0.18, the yield strength of the steel in different reductions could be well predicted.

关键词： cold rolling hypereutectoid pearlitic steel microstructure evolution mechanical hardening

nonlinear Transient Response of Functionally Graded Material Sandwich Doubly Curved Shallow Shell Using new Displacement Field

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Acta Mechanica Solida Sinica 2018年第1期31卷 108-126页

作者： Z.n.Li Y.x.Hao W.zhang J.H.zhang College of Mechanical Engineering Beijing Information Science and Technology University College of Mechanical Engineering Beijing University of Technology

In this paper, the nonlinear transient dynamic response of functionally graded material （FGM） sandwich doubly curved shell with homogenous isotropic material core and functionally graded face sheet is analyzed using a new displacement field on the basis of Reddy＇s third-order shear theory for the first time. The equivalent material properties for the FGM face sheet are assumed to obey the rule of simple power law function in the thickness direction. Based on Reddy＇s theory of higher shear deformation, a new displacement field is developed by introducing the secant function into transverse displacement. Four coupled nonlinear differential equations are obtained by applying Hamilton＇s principle and Galerkin method. It is assumed that the FGM sandwich doubly curved shell is subjected to step loading, air-blast loading, triangular loading, and sinusoidal loading, respectively. On the basis of double-precision variable- coefficient ordinary differential equation solver, a new program code in FORTRAn software is developed to solve the nonlinear transient dynamics of the system. The influences of core thickness, volume fraction, core-to-face sheet thickness ratio, width-to-thickness ratio and blast type on the transient response of the shell are discussed in detail through numerical simulation.

关键词： new displacement fields Functionally graded materials Sandwich doubly curvedshell Blast load nonlinear transient response

Regulation of thermoelastic properties of concave-packaged DnA adsorption films and its relevant microcantilever detection signals

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Acta Mechanica Sinica 2021年第4期37卷 705-711,I0004页

作者： C.x.Wu n.H.zhang C.Y.zhang J.Z.Wu School of Mechanics and Engineering Science Shanghai UniversityShanghai 200444China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and MechanicsShanghai 200072China

The packing patterns have close correlation with the thermoelastic properties of DnA adsorption films and the relevant detection signals of *** this paper,we investigate the influence of packing patterns on the thermoelastic properties of DnA adsorption films,the detection signals of microcantilevers and their temperature ***,the Parsegian's empirical potential based on a mesoscopic liquid crystal theory is employed to describe the interaction energy among coarse-grained DnA cylinders;then,the thought experiment method and the force balance method of nonlinear elastic network nodes are combined to characterize the elastic modulus,prestress and thermal expansion coefficient of DnA adsorption films;finally,based on an effective macroscopic continuum model for DnA microbeam deformation,we study the microcantilever resonance frequency shifts caused by DnA adsorptions and the temperature effect on the microcantilever static deflections,*** show that,compared with the convex-packaged,the re-entrant honeycomb packing pattern endows DnA adsorption films with a larger adjustable range of the elastic modulus and prestress,so as to make DnA-microcantilevers having an enhanced dynamic detection signal whereas a weaker response to temperature *** results are expected to provide a new option for the regulation design of DnA composite materials and microbeam sensors.

关键词： DnA-microbeam Packaging pattern Elastic property Thermal expansion coefficient Detection signal

nanostructures and nanoprecipitates induce high strength and high electrical conductivity in a CuCrZr alloy

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Journal of Materials Science & Technology 2020年第13期47卷 18-22页

作者： Z.Y.zhang L.x.Sun n.R.Tao Shenyang national Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China

The mixed nanostructure mainly consisting of nanotwins and nanograins was obtained in a solid solution CuCrZr alloy by means of dynamic plastic deformation at cryogenic *** subsequent aging treatments,the precipitation of Cr at nanometer scale provided further strengthening and brought substantial recovery of electrical *** aged nanostructured CuCrZr alloy exhibited a high tensile strength of 832MPa and a high electrical conductivity of 71.2%*** details of precipitation tuned by nanotwin boundaries were demonstrated in this *** combined strengthening of nanostructures and nanoprecipitates was discussed.

关键词： CuCrZr alloy nanotwins Precipitation hardening Aging Electrical conductivity

Distinct Electrical and Mechanical Responses of a Cu-10Fe Composite Prepared by Hot-Pressed Sintering and Post Treatment

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 255-265页

作者： x.Y.Yue S.Y.Peng x.zhang C.n.He Y.Z.Tian Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin300350China Research Centre for Metallic Wires Northeastern UniversityShenyang110819China

A Cu-10wt%Fe composite was prepared through hot-pressed sintering,and the material was subsequently solution *** hot-pressed sintered and solution treated materials were rolled and *** precipitation behavior and performance changes were systematically studied by using scanning electron microscopy and transmission electron *** contrast to the hot-pressed sintered specimen,the solution treatment significantly affects the thermal stability and properties of the Cu-10wt%Fe *** Cu-10wt%Fe composite was prepared after solid solution,cold rolling and aging at 773 K for 1 h,and it obtained excellent tensile strength of 494 MPa,uniform elongation of 16.3%,electrical conductivity of 51.1%IACS and softening temperature of 838 *** for the distinct difference in thermal stability and properties between hot-pressed sintered and solution treated specimens were *** findings provide a theoretical basis for designing high-performance Cu-based in-situ composites by post treatment.

关键词： Cu-Fe composite Hot-pressed sintering Thermal stability Strength Electrical conductivity

Comparing hydrogen embrittlement behaviors of two press hardening steels:2 GPa vs.1.5 GPa grade

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Journal of Materials Science & Technology 2022年第29期124卷 109-115页

作者： Z.H.Cao B.n.zhang M.x.Huang Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong KongChina

*** The pursuit of advanced high-strength steels(AHSS)has been rising for the automobile industry to build lightweight and fuelefficient vehicles without compromising crashworthiness[1,2].The group of press hardening steels(PHS)is an excellent candidate that comprises high strength,high toughness,and good formability,which are optimal to build intrusion resistant components such as(ⅰ)A/B-pillar reinforcements,(ⅱ)bumper and door beams.

关键词： strength toughness steels