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Tunneling Conductance in Quantum-Wire/Ferromagnetic-Insulator/d-Wave Superconductor Junction

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Communications in Theoretical Physics 2008年第5期49卷 1345-1348页

作者： li xiao-wei Department of Physics Huaiyin Teachers College Hunian 223001 China

We have studied the quasiparticle transport in quantum-wire /ferromagnetic-insulator/d wave super- conductor Junction （q/FI/d） in the framework of the Blonder-Tinkham-Klapwijk model. We calculate the tunneling conductance in q/FI/d as a function of the bias voltage at zero temperature and finite temperature based on Bogoliubov- de Gennes equations. Different from the case in normal-metal/insulator/d wave superconductor Junctions, the zero-bias conductance peaks vanish for the single-mode case. The tunneling conductance spectra depend on the magnitude of the exchange interaction at the ferromagnetic-insulator.

关键词： quantum wire ferromagnetic insulator d-wave superconductor tunneling conductance

Tunneling Conductance in Normal Metal/Insulator/Triplet Superconductor Junction

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Communications in Theoretical Physics 2005年第2X期44卷 381-384页

作者： li xiao-wei Department of Physics Huaiyin Normal College Huaian 223001 China

Tunneling conductance in normal metal/insulator/triplet superconductor junctions is studied theoretically as a function of the bias voltage at zero temperature and finite temperature. The results show there are zero-bias conductance peak, zero-bias conductance dip and double-minimum structures in the spectra for p-wave superconductor junctions. The existence of such structures in the conductance spectrum can be taken as evidence that the pairing symmetry of Sr2RuO4 is p-wave symmetry.

关键词： triplet superconductor p-wave tunneling conductance

Shot Noise in Ferromagnetic Superconductor Tunnel Junctions

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Communications in Theoretical Physics 2006年第2期45卷 369-372页

作者： li xiao-wei Department of Physics Huaiyin Normal College Huaian 223001 China

In this paper, the superconducting order parameter and the energy spectrum of the Bogoliubov excitations are obtained from the Bogoliubov-de Gennes （BdG） equation for a ferromagnetic superconductor （FS）. Taking into account the rough interface scattering effect, we calculate the shot noise and the differential conductance of the normalmetal insulator ferromagnetic superconductor junction. It is shown that the exchange energy Eh in FS can lead to splitting of the differential shot noise peaks and the conductance peaks. The energy difference between the two splitting peaks is equal to 2Eh. The rough interface scattering strength results in descent of conductance peaks and the shot noise-to-current ratio but increases the shot noise.

关键词： ferromagnetic superconductor N/I/FS junction shot noise the rough interface scattering

Josephson Effect in FS/I/N/I/FS Tunnel Junctions

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Communications in Theoretical Physics 2009年第10期52卷 721-725页

作者： li xiao-wei Department of Physics Huaiyin Teachers College Huai＇an 223001 China Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials Huaiyin Teachers College Huai＇an 223300 China

The Bogoliubov de Gennes equation is applied to the study of coherence effects in the ferromagnetic superconductor/insulator/normal metal/insulator/ferromagnetic/superconductor （FS/I/N/I/FS） junction. We calculated the Josephson current in FS/I/N/I/FS as a function of exchange field in ferromagnetic superconductor, temperature, and normal metal thickness. It is found that the Josephson critical current in FS/I/N/I/FS exhibits oscillations as a function of the length of normal metal. The exchange field always suppresses the Josephson critical current Ip for a parallel configuration of the magnetic moments of two ferromagnetic superconductor （FS） electrodes. In the antiparallel configuration, the Josephson critical current IAv at the minimum values of oscillation increases with the exchange field for strong barrier strength and at low temperatures.

关键词： Josephson current ferromagnetic superconductor current oscillation

Heat Transport in Graphene Ferromagnet-Insulator-Superconductor Junctions

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Chinese Physics Letters 2011年第4期28卷 197-200页

作者： li xiao-wei School of Physics and Electronic Electrical Engineering Huaiyin Normal UniversityHuai’an 223300 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050

We study heat transport in a graphene ferromagnet-insulator-superconducting *** is found that the thermal conductance of the graphene ferromagnet-insulator-superconductor(FIS)junction is an oscillatory function of the barrier strength X in the thin-barrier *** gate potential Uo decreases the amplitude of thermal conductance *** the amplitude and phase of the thermal conductance oscillation varies with the exchange energy *** thermal conductance of a graphene FIS junction displays the usual exponential dependence on temperature,reflecting the s-wave symmetry of superconducting graphene.

关键词： oscillation conductance superconductor

Evaluating and Constraining Hardware Assertions with Absent Scenarios

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Journal of Computer Science & Technology 2020年第5期35卷 1198-1216页

作者： Hui-Na Chao Hua-wei li xiaoyu Song Tian-Cheng Wang xiao-wei li State Key Laboratory of Computer Architecture Institute of Computing TechnologyChinese Academy of Sciences Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China Peng Cheng Laboratory Shenzhen 518052China Department of Electrical and Computing Engineering Portland State UniversityPortlandOR 97207U.S.A.

Mining from simulation data of the golden model in hardware design verification is an effective solution to assertion *** the simulation data is inherently incomplete,it is necessary to evaluate the truth values of the mined *** paper presents an approach to evaluating and constraining hardware assertions with absent scenarios.A Belief-fail Rate metric is proposed to predict the truth/falseness of generated *** considering both the occurrences of free variable assignments and the conflicts of absent scenarios,we use the metric to sort true assertions in higher ranking and false assertions in lower *** Belief-failRate guided assertion constraining method leverages the quality of generated *** experimental results show that the Belief-failRate framework performs better than the existing *** addition,the assertion evaluating and constraining procedure can find more assertions that cover new design functionality in comparison with the previous methods.

关键词： hardware formal verification assertion generation data mining assertion evaluation assertion coverage

Aldol Reactions Catalyzed by Proline Functionalized Polyacrylonitrile Fiber

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Chemical Research in Chinese Universities 2013年第2期29卷 256-262页

作者： xiao Jia li Guo-wei ZHANG Wen-qin Department of Chemistry School of Sciences Tianjin University Tianjin 300072 P. R. China

A proline functionalized fiber catalyst was employed for aldol reactions in water. In the presence of the fiber catalyst, the aldol reactions proceeded smoothly at 40 ℃ and the products were obtained in excellent yields which were higher than those obtained for the reactions catalyzed by L-proline or trans-4-hydroxy-L-proline. This newly developed fiber catalyst is applicable to the reactions of a wide range of aromatic aldehydes and exhibits ex- cellent reusability（up to 6 times） without any additional treatment.

关键词： Polyacrylonitrile fiber(PANF) Proline Aldol reaction Supported catalyst

Growth responses of gypsy moth larvae to elevated CO2： the influence of methods of insect rearing

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Insect Science 2011年第4期18卷 409-418页

作者： Lan-Zhu Ji lin-li An xiao-wei Wang Biodiversity Group Institute of Applied Ecology Chinese Academy of Sciences Shenyang China

The effects of elevated CO2 on foliar chemistry of two tree species （Populus pseudo-simonii Kitag. and Betula platyphylla） and on growth of gypsy moth （Lymantria dispar L.） larvae were examined. Furthermore, we focused on the comparison of results on the growth responses of larvae obtained from two methods of insect rearing, the nochoice feeding trial performed in the laboratory or in situ in open-top chambers. On the whole, both primary and secondary metabolites in the leaves of the two tree species were significantly affected by main effects of time （sampling date）, CO2 and species. Elevated CO2 significantly increased the C： N ratio and concentrations of the soluble sugar, starch, total nonstructural carbohydrates, total phenolics and condensed tannins, but significantly decreased the concentration of nitrogen. Higher contents of total phenolics and condensed tannins were detected in the frass of larvae reared in elevated CO2 treatments. Overall, the growth of gypsy moth larvae were significantly inhibited by elevated CO2 and CO2- induced changes in leaf quality. Our study did not indicate the two methods of insect rearing could influence the direction of effects of elevated CO2 on the growth of individual insects; however, the magnitude of negative effects of elevated CO2 on larval growth did differ between the two insect rearing methods, and it seems that the response magnitude was also mediated by larval age and host plant species.

关键词： elevated CO2 leaf quality Lymantria dispar no-choice feeding open-topchamber

Experimental study on the oxidation behavior and microstructural evolution of NG-CT-10 and NG-CT-20 nuclear graphite

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Nuclear Science and Techniques 2019年第11期30卷 139-148页

作者： wei Lu Ming-Yang li xiao-wei li Xin-Xin Wu li-Bin Sun Zheng-Cao li Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Collaborative Innovation Center of Advanced Nuclear Energy TechnologyInstitute of Nuclear and New Energy TechnologyTsinghua UniversityBeijing 100084China State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advance Materials(MOE)School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Engineering Physics Tsinghua UniversityBeijing 100084China

NG-CT-10 and NG-CT-20 are newly developed grades of nuclear-grade graphite from *** this study,their oxidation behaviors were experimentally investigated using thermal gravimetric *** evolution before and after oxidation was investigated using scanning electron microscope,mercury intrusion,and Raman *** apparent activation energy of NG-CT-10 nuclear graphite is 161.4 kJ/mol in a reaction temperature range of 550–700℃and that of NG-CT-20 is 153.5 kJ/mol in a temperature range of 550–650℃.The activation energy in the inner diffusion control regime is approximately half that in the kinetics control *** high temperatures,the binder phase is preferentially oxidized over the filler particles and small pores are generated in the *** new large or deep pores are generated on the graphite *** can diffuse along the boundaries of filler particles and through the binder phase,but cannot diffuse into the spaces between the nanocrystallites in the filler *** particles are oxidized starting at their outer surfaces,and the sizes of nanocrystallites do not decrease following oxidation.

关键词： Nuclear graphite Oxidation NG-CT-10 NG-CT-20 Activation energy