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Structural and mechanical properties of amorphous carbon films deposited by the dual plasma technique

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Journal of university of Science and technology beijing 2008年第5期15卷 622-626页

作者： Yaohui Wang,Xu Zhang,Xianying Wu,Huixing Zhang,and Xiaoji Zhang Key laboratory of the Ministry of Education of china for Beam technology and Material Modification,Institution of Low Energy {3. Physics,beijing Normal university beijing Radiation Center,beijing 100875,china Key laboratory of the Ministry of Education of china for Beam technology and Material Modification Institution of Low Energy Nuclear Physics Beijing Normal University beijing Radiation Center Beijing 100875 China

Direct current metal filtered cathodic vacuum arc （FCVA） and acetylene gas （C2H2） were wielded to synthesize Ti-containing amorphous carbon films on Si （100）. The influence of substrate bias voltage and acetylene gas on the microstructure and mechanical properties of the films were investigated. The results show that the phase of TiC in the （111） preferential crystallographic orientation exists in the film,and the main existing pattern of carbon is sp2. With increasing the acetylene flow rate,the contents of Ti and TiC phase of the film gradually reduce; however,the thickness of the film increases. When the substrate bias voltage reaches -600 V,the internal stress of the film reaches 1.6 GPa. The micro-hardness and elastic modulus of the film can reach 3..9 and 23..6 GPa,respectively,and the friction coefficient of the film is 0.25.

关键词： metal containing amorphous carbon amorphous carbon films filtered arc acetylene flow rate bias voltage structure and properties

Study of the structure of borromean nucleus 17Ne

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Study of the structure of borromean nucleus 17Ne

Theory study of shapes in ^(187,189)Tl nuclei

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： WANG Enhong (school of Physics and State Key laboratory of nuclear Physics and {3.,peking university,beijing 100871,china)

In the present research,we used the Ne beam with 3..8 MeV/u to bombard the 43.g/cm C target and measured angular correlations between the fragment and emitted *** the breakup reaction of Ne,one-proton knockout will result in an unstable nucleus F,which will further decay by the proton *** measured angular correlation between the momenta of F and its decay products has been compared with the theoretical calculations and indicate that the valuence proton in Ne has the most probility to situate in the S orbital with a small admixture of the d *** present reaults suggest that Ne has halo structure.

关键词： 17Ne two proton halo angular correlation break-up reaction

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Science china(Physics,Mechanics & Astronomy) 2009年第6期52卷 818-821页

作者： LIU YanXin1, YU ShaoYing1,2,3. SHEN CaiWan1,5 & DONG YongSheng1,2,4 1 school of Science, Huzhou Teachers College, Huzhou 3.3.00, china 2 school of Science and Information Engineering, Zhejiang Normal {3., Jinhua 3.1000, china 3.Institute of Theoretical Physics, Chinese Academy of Sciences, beijing 100080, china 4 Department of Physics, Jining Teachers College, Jining 012000, china 5 Center of Theoretical nuclear Physics, National laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 73.000, china school of Science Huzhou Teachers College Huzhou China school of Science and Information Engineering Zhejiang Normal University Jinhua China Institute of Theoretical Physics Chinese Academy of Sciences Beijing China Center of Theoretical nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China Department of Physics Jining Teachers College Jining China

The nuclear shapes of 187,189Tl were investigated theoretically in this work. The total routhian surface (TRS) calculations were performed for N=106 and 108 isotopes of thallium (Z=81). The single-particle energies were obtained from the deformed Woods-Saxon potential, with the Lipkin-Nogami (LN) treatment of pairing. It is found that the collective oblate rotation coexists with the high-K prolate rotation. Superdeformed prolate rotation is included in this calculation.

关键词： nuclear shape oblate rotation prolate rotation

Influence of Zn ion implantation on structures and field emission properties of multi-walled carbon nanotube arrays

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Science china(Technological Sciences) 2010年第3期53卷 776-781页

作者： CHEN KeFan,DENG JianHua,ZHAO Fei,CHENG GuoAn &ZHENG RuiTing Key laboratory of Beam technology and Material Modification of Ministry of Education,College of nuclear Science and technology,beijing Normal university,beijing100875,china Key laboratory of Beam technology and Material Modification of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing China

The structures and field emission properties of multi-walled carbon nanotube arrays implanted with Zn+ by MEVVA ion implanter have been *** results revealed that Zn+implantation induced structural damage and that the top of carbon nanotubes with multi-layered graphite structure were transformed into carbon nanowires with amorphous ***,C:Zn solid solution was synthesized after Zn+ *** turn-on field and threshold field were 0.80 and 1.3. V/μm,respectively for original multi-walled carbon nanotube arrays and were reduced to 0.66 and 1.04 V/μm due to the synthesis of C and Zn composite,in which the work function was reduced after low doses of Zn+*** is indicated that low doses of Zn+implantation can improve field emission performance of multi-walled carbon nanotube ***,high doses of Zn+implantation can reduce field emission properties of multi-walled carbon nanotube arrays,because radiation damage reduces the electric field enhancement factor.

关键词： multi-walled carbon nanotubes ion implantation field electron emission

Degradation of 4-chlorophenol in aqueous solution by γ-radiation and ozone oxidation

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Science china Chemistry 2006年第2期49卷 186-192页

作者： HU Jun1, WANG Jianlong1,2 & CHEN Rong1 1. laboratory of Environmental technology, Institute of nuclear Energy technology, Tsinghua university, beijing 100084, china 2. State Key Joint laboratory of Environmental Simulation and Pollution Control, Tsinghua university, beijing 100084, china Correspondence should be addressed to Wang Jianlong laboratory of Environmental technology Institute of Nuclear Energy Technology Tsinghua University Beijing China State Key Joint laboratory of Environmental Simulation and Pollution Control Tsinghua University Beijing China

The degradation of 4-chlorophenol (4-CP) by using gamma rays generated by a 60Co source in the presence of O3.was investigated. The radiolysis of 4-CP and the kinetics of 4-CP min-eralization were analyzed based on the determination of total organic carbon (TOC). The influence of initial 4-CP concentration and the free radicals scavengers (such as NaHCO3.and t-butanol) on the 4-CP degradation was also studied. The results showed that when the radiation rate was 3.6 Gy·min?1, 4-chlorophenol at concentration of 10 mg·L?1 could be completely degraded at the radiation dose of 2 kGy. The degradation of 4-chlorophenol could be described by a first-order reaction model, the rate constant of 4-CP degradation by combined ozonation and radiation was 0.1016 min?1, which was 2.4 times higher than the sum of radiation (0.0294 min?1) and ozonation (0.013. min?1). It re-vealed that the combination of radiation and ozonation resulted in synergistic effect, which can re-markably increase the degradation efficiency of 4-CP.

关键词： radiolysis, 4-chlorophenol, priority pollutant, degradation, O3. synergistic effect, kinetics.

Two-dimensional numerical simulation of hydrodynamic behaviors of drop covered with vapor film

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Science china(Technological Sciences) 2005年第2期48卷 180-190页

作者： DUAN Riqiang, JIANG Shengyao, ZHANG Youjie, JIA Haijun & YANG Xingtuan Institute of nuclear and New Energy technology, Tsinghua university Advanced Reactor Engineering and Safety, Key {3. of MOE of china, beijing 102201, china Institute of nuclear and New Energy technology Tsinghua University Beijing China Advanced Reactor Engineering and Safety Key Laboratory of MOE of China Beijing China

The breakup of drop covered with vapor film is numerically simulated. The moving particle semi-implicit method is used to solve the 2-dimensional unsteady Navier-Stokes equations for drop, vapor and ambient fluid. The results show that vapor film suppresses the drop breakup and hence the critical Weber number increases with the increasing thickness of vapor film. The breakup process can be divided into two stages. The drop deformation and breakup mainly occur in the later stage. Three breakup mechanisms are unveiled, which are almost the same as that of drop breakup without vapor film except for the stronger Rayleigh-Taylor instability for drop with vapor film. Our simulation results are comparable with the previous experiments.

关键词： drop breakup, vapor film, numerical simulation, particle method, moving particle semi-implicit method.

Relativistic description of second-order correction to nuclear magnetic moments

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Relativistic description of second-order correction to nucle...

The study of energy bands in nucleus ^(102)Zr

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： Li Jian~(1 1)) Yao Jiangming~(2 2)) Meng Jie~(1,3.3.) 1(State Key laboratory for nuclear Physics and technology,{3. of Physics,peking university,beijing 100871,china) 2({3. of Physical Science and technology,Southwest university,Chongqing 400715,china) {13. of Physics and nuclear Energy Engineering,Beihang university,beijing 100191,china)

Using the single particle states and residual interaction derived from the relativistic point-coupling model with PC-F1 parameter set,the second-order core polarization corrections to nuclear magnetic moments of double-closed shell nuclei plus or minus one nucleon with A = 15,17,3. and 41 have been studied and compared with previous non-relativistic *** has been found that the second-order corrections are *** these corrections,the relativistic description of isoscalar magnetic moments for nuclei with A= 15 and A = 3., becomes *** the isovector magnetic moments of nuclei with A = 15 and A = 3.,the negative second-order corrections improve the description significantly,while the positive corrections for nuclei with A = 17 and A = 41 still worsen the description.

关键词： second-order core polarization magnetic moments relativistic point-coupling model residual interaction

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Science china(Physics,Mechanics & Astronomy) 2010年第1期53卷 106-110页

作者： DONG GuoXiang 1,2 , YU ShaoYing 1,2,3., LIU YanXin 1 , SHEN CaiWan 1,2,4 & DONG YongSheng 1,2,5I school of Science, Huzhou Teachers College, Huzhou 3.3.00, china 2 school of Science and Information Engineering, Zhejiang Normal {3., Jinhua 3.1000, china 3.Institute of Theoretical Physics, Chinese Academy of Sciences, beijing 100080, china 4 Center of Theoretical nuclear Physics, National laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 73.000, china 5 Department of Physics, Jining Teachers College, Jining 012000, china school of Science Huzhou Teachers College Huzhou China school of Science and Information Engineering Zhejiang Normal University Jinhua China Institute of Theoretical Physics Chinese Academy of Sciences Beijing China Center of Theoretical nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China Department of Physics Jining Teachers College Jining China

Theoretical calculations of the energy bands in nucleus 102 Zr are carried out by taking the projected shell model approach, which has reproduced the experimental data. In addition, by analyzing band-head energies, corresponding configurations of yrast band, quasi-particle rotational bands and side bands, we have worked out the microscopic formation mechanism of axially symmetric deformation bands: The low-excitation deformation bands are attributed to the high-j intruder states 1g 7/2 and 1h 11/2 in the N=4, 5 shells; the quasi-particles in the orbit v5/2-[53.], v3.2+[411] and v3.2+[413. in particular play an important role in the deformation of 102 Zr.

关键词： projected shell model yrast band quasi-particle rotational band side band

β-decay of light neutron-rich nuclei

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β-decay of light neutron-rich nuclei