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Pd-Si binary bulk metallic glass

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Science China(Physics,Mechanics & Astronomy) 2008年第4期51卷 414-420页

作者： YAO KeFu chen na Key Laboratory of Advanced Materials Processing Technology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Pd80+xSi20-x (x=0,1,and 2) binary metallic glasses with the diameter ranging from 7 to 8 mm were prepared by a combination of fluxing and water quenching or air cooling. Thermal analysis results show that with increasing Si content,the glass transition temperature Tg,the initial crystallization temperature Tx and the onset crystalliza-tion temperature Tp of Pd-Si binary glassy alloys increase. Moreover,the super-cooled liquid region reaches 61 K. It indicates that Pd-Si binary alloys possess large glass forming ability,which can be greatly improved by fluxing treatment.

关键词： fluxing bulk metallic glass binary alloys glass forming ability undercooled liquid

Influence of Isotope on Shell Effects of Pre-scission Particle Evaporation

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Communications in Theoretical Physics 2005年第2X期44卷 343-346页

作者： YE Wei chen na Department of Physics Southeast University Nanjing 210096 China Department of Applied Mathematics Nanjing University of Finance & Economics Nanjing 210003 China

The shell effects on the particle evaporation prior to fission for three Pb isotopes, ^204Pb, ^208Pb, and ^212pb,as well as three Sn isotopes, ^128Sn, ^132Sn, and ^136Sn, are explored by a diffusion model. Calculations show that the magnitude of shell effects in the emission of particles changes with the neutron-to-proton ratio N/Z of these fissioning nuclei, and this change is affected significantly by the spin and excitation energy of the system. It is shown that high angular momentum enhances the dependence of shell effects on the N/Z while high excitation energy weakens such a dependence.

关键词： isotopic effect shell effect pre-scission particle emission Smoluchowski equation

Roles of Isospin in Evaporation Residue Cross Section as a Probe of Nuclear Dissipation

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Communications in Theoretical Physics 2008年第3期49卷 739-742页

作者： chen na YE Wei Department of Applied Mathematics Nnnjing University of Finance ＆ Economics Nnnjing 210046 China Department of Physics Southeast University Nanjing 210096 China

The influence of isospin on the excess of evaporation residue cross section over its standard statistical-model value for nuclei ^194pb, ^200Pb, and ^206pb is studied via a Langevin equation coupled with a statistical decay model. The magnitude of this excess for a low-isospin fissioning nucleus is shown to be larger and its dependence on the nuclear viscosity coefficient to be stronger than those of a high-isospin fissioning nucleus. These results suggest that to obtain a more accurate information of viscosity coefficient inside the saddle point by measuring evaporation residue cross sections, we had better choose those compound systems with small isospin.

关键词： evaporation residue cross section isospin effect nuclear dissipation Langevin equation

Role of N/Z in Pre-scission Neutrons as an Observable of Nuclear Friction

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Communications in Theoretical Physics 2009年第8期52卷 329-332页

作者： chen na YE Wei School of Applied Mathematics Nanjing University of Finance and Economics Nanjing 210046 China Department of Physics Southeast University Nanjing 210096 China

A dynamical Langevin model is employed to evaluate the excess of the neutron emission in the fission ofheavy nuclei ^(240)Cf,^(246)Cf,^(254)Cf,^(240)U relative to the standard statistical-model prediction at various saddle-to-scissionfriction *** is shown that when the neutron-to-proton ratio N/Z of the system increases,the sensitivityof the excess to the friction decreases substantially,and it almost disappears for ^(240)*** suggest that using thosecompound systems with low N/Z favors an accurate determination for the saddle-to-scission friction strength based onthe measurement of the pre-scission neutron multiplicity.

关键词： pre-scission neutron multiplicity N/Z effect nuclear friction Langevin model

Correlation between indoor and outdoor corrosion tests for coal train body steel in a coal medium environment

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Journal of Iron and Steel Research International 2022年第9期29卷 1495-1504页

作者： Jia-liang Song Jun-hang chen Pan Yi na-na chen Zhao-liang Li Kui Xiao Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Corrosion and Protection Center University of Science and Technology BeijingBeijing 100083China China Electric Power Research Institute Beijing 100192China

Q345B carbon steel as well as Q450NQR1 and S500AW weathering steels were subjected to outdoor exposure corrosion tests in coal environments and indoor periodic immersion accelerated corrosion tests with a simulated coal leaching *** corrosion kinetics were studied by the weight loss method,and the corrosion morphology and corrosion product composition were observed and analyzed by scanning electron microscopy,energy-dispersive spectroscopy and X-ray ***,correlation analysis of the indoor and outdoor tests was carried out by the gray correlation analysis *** results show that the relationship between the corrosion weight loss and corrosion time of the three steels conforms to follow the exponent power *** particular,Q450NQR1 steel has the best corrosion *** types of corrosion products and the distribution of elements in the rust layer of the three steels are similar in the indoor and outdoor *** gray correlation degrees of the three steels in the indoor and outdoor tests are all greater than 0.6;thus,the two corrosion tests have a good *** on this,the accelerated simulation test method of the coal leaching solution is determined,and life prediction models of three steels in coal leaching solution are established to simulate the corrosion of the bottom board and side board.

关键词： Coal train body steel Coal environment-Corrosion Outdoor exposure test Indoor acceleration test Correlation

Intermediate Energy Reactions Versus Heavy-Ion Fusion: Light Particle Emission and Post-Saddle Friction in the Presence of Deformation Effects

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Communications in Theoretical Physics 2019年第6期71卷 697-701页

作者： na chen Wei Ye School of Applied Mathematics Nanjing University of Finance&EconomicsNanjing210023China Department of Physics Southeast UniversityNanjing210096China

A decaying nucleus undergoes a change in deformation when it fissions. This affects the particle emission in the fission process. Using the dynamical Langevin model, we investigate the role of deformation in the sensitivity of post-saddle neutrons and light charged particles(LCPs) to the post-saddle friction strength(β) for heavy nuclei240 Am produced with different initial conditions:(i) a low excitation energy E*and a large spin ?(provided via a fusion mechanism) and(ii) a high E*and a large ? as well as a higher E*but a small ?(provided in peripheral and near-central intermediate energy heavy-ion reactions, respectively). It is shown that deformation obviously enhances the sensitivity of post-saddle neutrons to β at intermediate-energy peripheral collisions and that for case(i), the drop of LCPs emission due to deformation makes post-saddle LCPs to be almost insensitive to β, but for case(ii) LCPs still have a significant change with β. Furthermore, we find that post-saddle LCPs display a greater sensitivity to β for near-central collisions than for peripheral collisions. These results suggest that given the deformation effects, to better probe post-saddle dissipation properties with neutrons(LCPs) in experiments, it is best to choose those excited heavy nuclear systems populated in peripheral(near-central) collisions at intermediate energies.

关键词： post-saddle friction deformation excitation energy light particles stochastic model

Teleportation of a Bipartite Entangled Coherent State via a Four-Partite Cluster-Type Entangled State

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Communications in Theoretical Physics 2009年第10期52卷 597-600页

作者： chen Hui-na LIU Jin-Ming State Key Laboratory of Precision Spectroscopy Department of Physics East China Normal University Shanghai 200062 China Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore

We present an optical scheme to almost completely teleport a bipartite entangled coherent state using afour-partite cluster-type entangled coherent state as quantum *** scheme is based on optical elements suchas beam splitters,phase shifters,and photon *** also obtain the average fidelity of the teleportation *** is shown that the average fidelity is quite close to unity if the mean photon number of the coherent state is not toosmall.

关键词： teleportation entangled coherent state photon detector fidelity

A Detailed Study of Pre-scission γ Emission as a Probe of Nuclear Dissipation

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Communications in Theoretical Physics 2007年第4X期48卷 710-712页

作者： WU Feng YE Wei chen na Department of Physics Southeast University Nanjing 210096 China Department of Mathematics Nanjing University of Finance & Economics Nanjing 210003 China

Using a Langevin equation coupled with a statistical model, we calculate pre-scission giant dipole resonance （GDR） γ-ray multiplicity of nuclei 194 pb, 200Pb, 206Pb, and 200 Os. It is demonstrated that with increasing the isospin asymmetry of these fissioning nuclei the sensitivity of the emitted γ multiplicity to the nuclear viscosity coefficient is decreased significantly. For 200Os nuc/eus, this γ-ray emission is no longer sensitive to the magnitude of the viscosity coefficient. In addition, the effect of the isospin asymmetry on the γ rays as a probe of nuclear dissipation is reduced with increasing angular momentum. These results suggest that to obtain a more accurate information of the viscosity coemfficient by the measurement of pre-scission GDR γ-ray multiplicity it is better to choose those compound systems with small isospin asymmetry and low spin.

关键词： giant dipole resonance γ-ray multiplicity nuclear dissipation isospin asymmetry effect Langevin equation

Carbon-coated magnetic particles increase tissue temperatures after laser irradiation

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Journal of Innovative Optical Health Sciences 2015年第5期8卷 50-55页

作者： Shupeng Liu na chen Fufei Pang Zhengyi chen Tingyun Wang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University 149 Yanchang Road Shanghai 200072P.R.China Institute of Biomedical Engineering Shanghai University 149 Yanchang RoadShanghai 200072P.R.China

Purpose:This work focused on the investigation the hyperthermia performance of the carboncoated magnetic particles(CCMPs)in laser-induced *** and methods:We prepared CCMPs using the organic carbonization method,and then characterized them with transmission electron microscopy(TEM),ultraviolet-visible(UV-Vis)spectrophotometry,vibrating sample magnetometer(VSM)and X-ray di®raction(XRD).In order to evaluate their performance in hyperthermia,the CCMPs were tested in laser-induced thermal therapy(LITT)experiments,in which we employed a fully distributedfiber Bragg grating(FBG)sensor to profile the tissue's dynamic temperature change under laser irradiation in real ***:The sizes of prepared CCMPs were about several micrometers,and the LITT results show that the tissue injected with the CCMPs absorbed more laser energy,and its temperature increased faster than the contrast tissue without ***:The CCMPs may be of great help in hyperthermia applications.

关键词： Carbon-coated magnetic particles hyperthermia laser