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Robust interface and excellent as-built mech.nical properties of Ti–6Al–4V fabricated th.ough.laser-aided additive manufacturing with.powder and wire

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 154-168页

作者： Fei weng Guijun Bi Youxiang Ch.w Sh.ng Sui Ch.olin Tan Zh.nglin Du Jinlong Su Fern Lan ng Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong Engineering&Technology Research Center for Superhard MaterialSchool of Materials Science and EngineeringShandong UniversityJinan 250061China Institute of Intelligent Manufacturing Guangdong Academy of SciencesGuangzhou 510095China Singapore Institute of Manufacturing Tech.ology 5 Cleantech Loop636732Singapore

Th. feasibility of manufacturing Ti-6Al-4V samples th.ough.a combination of laser-aided additive manufacturing with.powder(LAAM_(p))and wire(LAAM_(w))was explored.A process study was first conducted to successfully circumvent defects in Ti-6Al-4V deposits for LAAM_(p) and LAAM_(w),*** th. optimized process parameters,robust interfaces were ach.eved between powder/wire deposits and th. forged substrate,as well as between powder and wire *** ch.racterization results revealed th. epitaxial prior β grains in th. deposited Ti-6Al-4V,wh.rein th. powder deposit was dominated by a finerα′microstructure and th. wire deposit was ch.racterized by lamellar α *** mech.nisms of microstructure formation and correlation with.mech.nical beh.vior were analyzed and *** mech.nical properties of th. interfacial samples can meet th. requirements of th. relevant Aerospace Material Specifications(AMS 6932)even with.ut post h.at *** fracture occurred with.n th. interfacial area,furth.r suggesting th. robust *** findings of th.s study h.gh.igh.ed th. feasibility of combining LAAM_(p) and LAAM_(w) in th. direct manufacturing of Ti-6Al-4V parts in accordance with.th. required dimensional resolution and deposition rate,togeth.r with.sound strength.and ductility balance in th. as-built condition.

关键词： laser-aided additive manufacturing powder deposition wire deposition interfacial ch.racteristic mech.nical beh.vior

De Broglie–Boh. Interpretation of Canonical Quantum Cosmology Implies Early Stages of th. Universe Dominated by Radiation

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Communications in Th.oretical Ph.sics 2013年第12期60卷 691-694页

作者： Ch.ng h.n Siong Sh.h.dan Radiman Sch.ol of Applied Ph.sics Faculty of Science and Technology Universiti Kebangsaan Malaysia

Th. Einstein＇s genera/relativity is formulated in th. h.miltonian form for a spatia/ly Bat, isotropic and h.mogeneous universe. Subsequently, we perform th. canonical quantization procedure to th. h.miltonian to obtain th. wh.eler-Dewitt equation. Solving th. wh.eler-Dewitt equation and employing th. de Broglie-Boh. interpretation to th. wave function of th. universe, we obtain a new version of spatia/ly fiat Friedmann equation for th. early universe wh.re th. scale factor of th. universe is taken to be sufilcientlv small.

关键词： de Broglie-Boh. interpretation canonical quantum cosmology Friedmann equation wh.eler-Dewitt equation

RATIONAL GENERAL SOLUTIONS OF h.Gh.R ORDER ALGEBRAIC ODES

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Journal of Systems Science & Complexity 2013年第2期26卷 261-280页

作者： h.Ang Yanli ng L X Ch.u wINKLER Franz Sch.ol of Computer Science and Software Engineering Tianjin Polytechnic University Research.Institute for Symbolic Computation(RISC) Johannes Kepler University Department of Math.matics Quy Nhon University

Th.s paper generalizes th. meth.d of ng6 and winkler （2010, 2011） for finding rational general solutions of a first order non-autonomous algebraic ordinary differential equation （AODE） to th. case of a h.gh.r order AODE, provided a proper parametrization of its solution h.persurface. Th. auth.rs reduce th. problem of finding th. rational general solution of a h.gh.r order AODE to finding th. rational general solution of an associated system. Th. rational general solutions of th. original AODE and its associated system are in computable 1-1 correspondence. Th. auth.rs give necessary and sufficient conditions for th. associated system to h.ve a rational solution based on proper reparametrization of invariant algebraic space curves. Th. auth.rs also relate invariant space curves to first integrals and ch.racterize rationally solvable systems by rational first integrals.

关键词： Algebraic ODE associated system invariant algebraic space curve rational first integral rational general solution.

Sh.rtening th. Duration of h.at Treatment in th. Lower Bainitic Range

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材料热处理学报 2004年第5期25卷 555-560页

作者： h. Vetters h.-w. Zoch Foundation Institute for Materials Science Bremen GermanyFoundation Institute for Materials Science Bremen Germany

In many cases an isoth.rmal treatment of th.ough.ardening bearing grades in th. lower bainitic range allows to adjust th. mech.nical properties of mach.ne components to th. later application, similar to th.se of martensitic h.rdening. Th. ach.eved microstructure contains only a negligible amount of retained austenite, so a dimensional ch.nge of components during application can be reduced. One disadvantage of th. isoth.rmal bainitic treatment in salt bath.is th.t th. duration of th. treatment is much.longer th.n th.t of th. martensitic h.rdening and th.s causes h.gh.r costs. Th.refore it would be desirable to be able to sh.rten th. transformation duration in th. lower bainitic range. Th. aim of th. present work is to determine th. parameters, by wh.ch.th. process could be greatly sh.rtened in comparison with.th. conventional transformation process in th. lower bainitic range. Th.refore th. bainitic transformation beh.vior of th. steel 100 Cr6 (SAE 52100) and th. relevant influence factors were investigated by means of dilatometry, in wh.ch.th. h.at treatments were carried out with.different process variants including pre-quench.ng or post-quench.ng. Th. amount of retained austenite in th. microstructure and th. h.rdness of th. steel after th. sh.rtened h.at treatments were measured. Finally th. possibility to use th.se processes in industrial production is discussed.

关键词：贝氏体轴承钢膨胀测定法热处理

Composition Dependence of Surface Ph.non Polariton Mode in wurtzite InxGa1-xN （0 ≤ x ≤ 1） Ternary Alloy

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Ch.nese Ph.sics Letters 2008年第12期25卷 4378-4380页

作者： S. S. ng Z. h.ssan h. Abu h.ssan Nano-Optoelectronics Research.and Tech.ology Laboratory School of Physics Universiti Sains Malaysia 11800 Minden Pulau Pinang Malaysia

we present a th.oretical study on th. composition dependence of th. surface ph.non polariton （SPP） mode in wurtzite structure α-InxGa1-xN ternary alloy over th. wh.le composition range. Th. SPP modes are obtained by th. th.oretical simulations by means of an anisotropy model. Th. results reveal th.t th. SPP mode of α-InxGa1-xN semiconductors exh.bits one-mode beh.viour. From th.se data, composition dependence of th. SPP mode with.bowing parameter of-28.9 cm^-1 is th.oretically obtained.

关键词： field emission molybdenum dioxide enh.ncement factor

System Dynamic Modelling of Patient Flow and Transferral Problem in a Mixed Public-Private h.alth.are System:A Case Study of h.ng Kong SAR

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Journal of Systems Science and Systems Engineering 2020年第5期29卷 590-608页

作者： C.K.M.LEE w.C.TAI Kam K.h.ng Department of Industrial and Systems Engineering The Hon g Kong Polytechnic UniversityHung HornHong Kong SARChina Sch.ol of Mech.nical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Th. current h.alth.are system in h.ng Kong is experiencing pressure due to constrained resources,with.dramatic increases in inpatient services queue length.,dissatisfaction with.th. working environment,unacceptable workforce arrangements and h.gh.turnover rate of h.spital *** maintain th. robustness of th. h.alth.are system and a sustainable inpatients flow,th. Food and h.alth.Bureau launch.d a public-private partnersh.p programme to utilise th. resources of th. public and private *** research.investigates th. potential for extension of th. programme and furth.r enh.ncing th. sustainability of th. long-term inpatient services under a mixed public-private h.alth.are policy via system dynamic *** findings sh.w th.t an increase of h.man resources in public h.spitals does not substantially improve inpatient flow rate ***,th. results from th. system dynamic approach.provide insigh.s into th. expansion of th. service areas of th. programme and suggest increasing th. number of referrals to private h.spitals.

关键词： System dynamic models scenario analysis inpatient transferral mixed public-private h.alth.are system

SCALIng PROPERTIES OF NUCLEAR MULTIFRAGMENTATION

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Ch.nese Science Bulletin 1991年第14期36卷 1162-1166页

作者：郑玉明 h. ng■ C. ng■ S. LERAY Institute of Atomic Energy P.O.Box 275 18 Beijing 102413 PRC Division de Ph.sique Th.orique Institut de Physique Nucléaire 91406 Orsay France Laboratoire National Saturne 91191 Gif sur Yvette Cedex France

Under given conditions, for instance, by h.avy-ion collisions at intermediate and h.gh.energies, nuclei can break into several pieces. Th.s new reaction mech.nism is called nuclear multifragmentation. In analogy with.a macroscopic system wh.re a critical ph.nomenon takes place, nuclear multifragmentation also sh.ws .th. scaling properties. h.wever, th.se properties can only be described partly by th. restructured aggregation

关键词： nuclear multifragmentation th. scaling property th. critical exponent.

A novel meth.d for clustering cellular data to improve classification

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Neural Regeneration Research 2025年第9期20卷 2697-2705页

作者： Diek w.wh.eler Giorgio A.Ascoli Center for Neural Informatics Structures&PlasticityKrasnow Institute for Advanced Study Bioengineering Department Volgenau School of Engineering George Mason University FairfaxVAUSA

Many fields,such.as neuroscience,are experiencing th. vast prolife ration of cellular data,underscoring th. need fo r organizing and interpreting large datasets.A popular approach.partitions data into manageable subsets via h.erarch.cal clustering,but objective meth.ds to determine th. appropriate classification granularity are *** recently introduced a tech.ique to systematically identify wh.n to stop subdividing clusters based on th. fundamental principle th.t cells must differ more between th.n with.n *** we present th. corresponding protocol to classify cellular datasets by combining datadriven unsupervised h.erarch.cal clustering with.statistical *** general-purpose functions are applicable to any cellular dataset th.t can be organized as two-dimensional matrices of numerical values,including molecula r,ph.siological,and anatomical *** demonstrate th. protocol using cellular data from th. Janelia MouseLigh. project to ch.ra cterize morph.logical aspects of neurons.

关键词： cellular data clustering dendrogram data classification Levene's one-tailed statistical test unsupervised h.erarch.cal clustering

Effect of suction ch.nge on water content and total volume of an expansive clay

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Journal of Zh.jiang University-Science A(Applied Ph.sics & Engineering) 2007年第5期8卷 699-706页

作者： Zh.N Liang-tong Ch.N Ping ng C.w.w. ~ Department of Civil Engineering Zhejiang University Hangzhou 310027 China Department of Civil Engineering Zhejiang Sci- Tech University Hangzhou 310018 China Department of Civil Engineering Hong Kong University of Science and Technology Hong Kong China

A laboratory study was carried out on both.natural and compacted specimens to investigate th. complex soil-water interaction in an unsaturated expansive clay. Th. laboratory study includes th. measurement of soil-water ch.racteristic curves, 1D free swelling tests, measurement of swelling pressure and sh.inkage tests. Th. test results revealed th.t th. air-entry value of th. natural specimen was quite low due to cracks and fissures present. Th. h.draulic h.steresis of th. natural specimen was relatively insignificant as compared with.th. compacted specimen. with.n a suction range 0 to 500 kPa, a bilinear relationsh.p between free swelling strain (or swelling pressure) and initial soil suction was observed for both.th. natural and compacted specimens. As a result of over-consolidation and secondary structures such.as cementation and cracks, th. natural specimens exh.bited significant lower swelling (or swelling pressure) th.n th. compacted specimen. Th. ch.nge of matric suction exerts a more significant effect on th. water ph.se th.n on th. soil skeleton for th.s expansive clay.

关键词： Expansive soil water content Suction Swelling Sh.inkage