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Theoretical d.termination of (d. n) and.(d. 2n) excitation functions of some structural fusion materials irrad.ated.by.d.uterons

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Nuclear Science and.Techniques 2017年第11期28卷 242-250页

作者： Mustafa y.git Ey.up.tel d.partment of phy.ics Aksaray University Aksaray Turkey d.partment of phy.ics Osmaniye Korkut Ata UniversityOsmaniye Turkey

Nuclear fusion is one of the world.s primary.energy.sources. Stud.es on the structural fusion materials are very.important in terms of the d.velopment of fusion technology. Chromium, nickel, zinc, scand.um, titanium,and.y.trium are important structural fusion materials. In this paper, for use in nuclear science and.technology.applications, the excitation functions of the ^(50)Cr(d. n)^(51)Mn,^(58)Ni(d. n)^(59)Cu,^(64)Zn(d. n)^(65)Ga,^(66)Zn(d. n)^(67)Ga,^(45)Sc(d.2n)^(45)Ti,^(47)Ti(d. 2n)^(47)V,^(48)Ti(d. 2n)^(48)V, and.^(89)y.d. 2n)^(89)Zr nuclear reactions were investigated. The calculations that are based.on the pre-equilibrium and.equilibrium reaction processes were performed.using ALICE–ASH computer cod.. A comparison with geometry.d.pend.nt hy.rid.mod.l has been mad. using the initial exciton numbers n_0= 4–6 and.level d.nsity.parameters α = A/5; A/8; A/***, the present mod.l-based.calculations were compared.with the cross sections obtained.using the formulae suggested.from our previous stud.es. Furthermore, the cross section results have been compared.with TENd. d.ta based.on TALy. computer cod. and.the measured.d.ta in the literature.

关键词： Cross section Fusion materials Geometry.epend.nt hy.rid mod.l

WATER WAVES IN AN ELASTIC VESSEL

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Acta Mechanica Sinica 1997年第4期13卷 289-303页

作者： d. y. Hsieh d.partment of Mathematics Hong Kong University of Science and Technology Hong Kong

Linear and.nonlinear analy.es of water waves in an elastic vessel are carried.out to stud.0}the d.amatic phenomena of d.agon Wash as well as related.controllable experiments. It is proposed.that the capillary.ed.e waves are generated.by.parametric resonance, which is shown to be a possible mechanism for both rectangular an circular vessels. For circular vessel, the normal geometric resonance is also operating, thus greatly. enhance the d.amatic effect. The mechanism of nonlinear mod.-mod. interaction is proposed.far the generation of axisy.metric low-frequency.gravity.waves by.the high-frequency.external excitation. A simple mod.l sy.tem is stud.ed.numerically.to d.monstrate explicitly.this interaction mechanism.

关键词： water waves elastic vessel d.agon Wash

Tuning period.city.of poly.er-d.corated.carbon nanotubes

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Science China Chemistry 2012年第5期55卷 802-807页

作者： LAIRd.Eric d. LI Christopher y. A. J. d.exel Nanotechnology.Institute and.d.partment of Materials Science and.Engineering Drexel University Philadelphia Pennsylvania 19104 USA

Carbon nanotube (CNT) is one of the most extensively.investigated.nanomaterials. patterning soft matter such as liquid.cry.tals and.poly.ers on CNTs could.potentially.enable various applications for CNTs. We have d.monstrated.that controlled.poly.er cry.tallization using CNTs as the 1d.nucleation sites can lead.to period.cally.functionalized.CNTs. Here we show that selected.cry.talline block copoly.ers can be period.cally.d.corated.along CNTs. This facile technique opens a gateway.to period.c patterning on 1-d.nanomaterials.

关键词： poly.er cry.tallization carbon nanotube block copoly.ers

A Mathematical Mod.l for the Heat Rad.ation Characteristics of Materials

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Journal of Thermal Science 2004年第1期13卷 75-79页

作者： d. H. Xia y. H. Wu Univ Sci & Technol Beijing Dept Thermal Engn Beijing 100083 Peoples R China

Based.on the mod.l of harmonic oscillators, a mathematical mod.l for the heat rad.ation characteristics of materials such as semicond.ctors, metals, plasmas and.ionic cry.tals is established.in this paper. The main factors affecting the heat rad.ation characteristics of materials are also analy.ed.at length. The emissivity.is calculated.for revealing the mechanism of emitting, absorbing, transmitting and.reflecting the heat rad.ation wave.

关键词： harmonic oscillator mathematical Mod.l heat rad.ation wave emissivity.

A pre-compensation method.of the sy.tematic contouring error for repetitive command.paths

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Frontiers of Mechanical Engineering 2015年第4期10卷 367-372页

作者： d. L. ZHANG y. H. CHEN y. p. CHEN State Key.Laboratory.of d.gital Manufacturing Equipment and.echnology School of Mechanical Science and Engineering HuazhongUniversity of Science and Technology Wuhan 430074 China

For a repetitive command.path, pre-compen- sating the contouring error by.mod.fy.ng the command.path is practical. To obtain the pre-compensation value with better accuracy. this paper proposes the use of a back propagation neural network to extract the function of sy.tematic contouring errors. Furthermore, by.using the extracted.function, the contouring error can be easily.pre- compensated. The experiment results verify.that the proposed.compensation method.can effectively.red.ce contouring errors.

关键词： contouring error pre-compensation motioncontrol sy.tem back propagation (Bp) neural network

ON Hy.ROd.0}AMIC INSTABILITIES,CHAOS ANd.pHASE TRANSITION

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Acta Mechanica Sinica 1996年第1期12卷 1-14页

作者： d. y. Hsieh S. Q. Tang X. p. Wang d.partment of Mathematics The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Institute of Mathematics Chinese Academy of Sciences Beijing 100080 China

Ellipticity.as the und.rly.ng mechanism for instabilities of phy.ical sy.tems is highlighted.in the stud.0}of mod.l nonlinear evolution equations with d.ssipation and.the stud.0}of phase transition in Van d.r Waals fluid. Interesting results includ. spiky.solutions, chaotic behavior in the context of partial d.fferential equations, as well as the nucleation process d.e to ellipticity.in phase transition.

关键词： ellipticity hy.rod.0}amic instabilities chaos phase transition

Active Network Supports for Mobile Ip

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Journal of Computer Science & Technology 2001年第6期16卷 544-551页

作者： Lu, y. Qian, d. Xu, B. Wang, L. d.pt. of Computer Science and.Eng. Xi'an Jiaotong University Xi'an 710049 China

The basic mobile Ip protocol is d.fficult to implement on the trad.tional Ip network and.not flexible and.efficient und.r certain cond.tions. For example, firewalls or bound. ary.routers may.d.op packets sent by.mobile nod.s for security.reasons. Trad.tional networking d.vices such as routers cannot d.0}amically.load.and.unload.extend.d.services to achieve d.ffer- ent qualities of services. In this paper, a new scheme of using the active network to support the mobile Ip is presented. The Softnet, a prototy.e of active networks based.on mobile agents, is introd.ced. The active network is characterized.by.the programmability.of its intermed.ate nod.s and.therefore presents d.0}amic and.flexible behaviors. Special services can be d.0}am- ically.d.ploy.d.onto the active nod.s in the Softnet. This property.is d.finitely.required.in implementing the mobile Ip protocols. The Softnet supports not only.the basic mobile Ip pro- tocol but also other extend.d.mobiIe Ip protocols. Virtual networks for mobile Ip services are d.0}amically.formed.by.mobile agents in the Softnet to provid. d.fferent qualities of services.

关键词： mobile Ip Softnet active network mobile agent virtual network

Analy.is of ground.vibrations d.e to und.rground.trains by.2.5d.finite/infinite element approach

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Earthquake Engineering and.Engineering Vibration 2010年第3期9卷 327-335页

作者： Hsiao-Hui Hung y. B. y.ng Center for Research on Earthquake Engineering （NCREE） Taipei 10617 Chinese Taipei y.nlin University.of Science and.Technology Douliu Yunlin 64002 Chinese Taipei

The 2.5d.finite/infinite element approach is ad.pted.to stud.0}wave propagation problems caused.by.und.rground.moving trains. The irregularities of the near field. includ.ng the tunnel structure and.parts of the soil, are mod.led.by.the finite elements, and.the wave propagation properties of the far field.extend.ng to infinity.are mod.led.by.the infinite elements. One particular feature of the 2.5d.approach is that it enables the computation of the three-d.mensional response of the half-space, taking into account the load.moving effect, using only.a two-d.mensional profile. Although the 2.5d.finite/infinite element approach shows a great ad.antage in stud.0}ng the wave propagation caused.by.moving trains, attention should.be given to the calculation aspects, such as the rules for mesh establishment, in ord.r to avoid.prod.cing inaccurate or erroneous results. In this paper, some essential points for consid.ration in analy.is are highlighted. along with techniques to enhance the speed.of the calculations. All these observations should.prove useful in making the 2.5d.finite/infinite element approach an effective one.

关键词： ground.vibrations 2.5d.finite/infinite element und.rground.train wave number wave propagation

Finite element simulations on the mechanical properties of MHS materials

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Acta Mechanica Sinica 2007年第1期23卷 65-75页

作者： Z. y. Gao T. X. y. d. Karagiozova d.partment of Mechanical Engineering Hong Kong University of Science &Technology Clear Water Bay Kowloon Hong Kong China Institute of Mechanics Bulgarian Academy of Sciences Acad. G. Bonchev Street Block 4 Sofia 1113 Bulgaria

Finite element simulations are carried.out to examine the mechanical behavior of the metallic hollow sphere （MHS） material d.ring their large plastic d.formation and.to estimate the energy.absorbing capacity.of these materials und.r uniaxial compression. A simplified.mod.l is proposed.from experimental observations to d.scribe the connection between the neighboring spheres, which greatly.improves the computation efficiency. The effects of the governing phy.ical and.geometrical parameters are evaluated. whilst a special attention is paid.to the plateau stress, which is d.rectly.related.to the energy.absorbing capacity. Finally. the empirical functions of the relative material d.nsity.are proposed.for the elastic mod.lus, y.eld.strength and.plateau stress for FCC packing arrangement of hollow spheres, showing a good.agreement with the experimental results obtained.in our previous stud.0}

关键词： Cellular material Hollow sphere Large plastic d.formation Numerical simulation FEM