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Irradiation damage simulation of Zircaloy-4 using argon ions bombardment

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Journal of University of Science and Technology Beijing 2008年第3期15卷 285-289页

作者： Dequan peng Xinde Bai feng Pan Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

To simulate irradiation damage, argon ion was implanted in the Zircaloy-4 with the fluence ranging from 1 × 10^16 to 1 × 10^17 cm^-2, using accelerating implanter at an extraction voltage of 190 kV and liquid nitrogen temperature. Then the influence of argon ion implantation on the aqueous corrosion behavior of Zircaloy-4 was studied. The valence states of elements in the surface layer of the samples were analyzed using X-ray photoelectron spectroscopy （XPS）. Transmission electron microscopy （TEM） was used to examine the microstructure of the argon-implanted samples. The potentiodynamic polarization technique was employed to evaluate the aqueous corrosion resistance of implanted Zircaloy-4 in 1 mol/L HzSO4 solution. It is found that there appear bubbles on the surface of the samples when the argon fluence is 1 × 10^16 cm^-2. The microstructure of argon-implanted samples changes from amorphous to partial amorphous, then to polycrystalline, and again to amorphous. The corrosion resistance of implanted samples linearly declines with the increase of fluence approximately, which is attributed to the linear increase of the irradiation damage.

关键词： Zircaloy-4 corrosion resistance argon ion implantation X-ray photoemission spectroscopy (XPS) transmission electron microscopy (TEM)

New γ-Ray Sources Identified in All-sky Surveys Based on Fermipy's Advanced Algorithm

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Research in Astronomy and Astrophysics 2024年第10期24卷 81-91页

作者： Yunchuan Xiang peng feng Xiaofei Lan School of Physics and Astronomy China West Normal UniversityNanchong 637009China Department of Astronomy Yunnan Universityand Key Laboratory of Astroparticle Physics of Yunnan ProvinceKunming 650091China

We employ an efficient method for identifying γ-ray sources across the entire sky,leveraging advanced algorithms from Fermipy,and cleverly utilizing the Galactic diffuse background emission model to partition the entire sky into72 regions,thereby greatly enhancing the efficiency of discovering new sources throughout the sky through multithreaded parallel *** confirming the reliability of the new method,we applied it for the first time to analyze data from the Fermi Large Area Telescope(Fermi-LAT)encompassing approximately 15.41 yr of all-sky *** this analysis,we successfully identified 1379 new sources with significance levels exceeding 4σ,of which 497 sources exhibited higher significance levels exceeding 5σ.Subsequently,we performed a systematic analysis of the spatial extension,spectra,and light variation characteristics of these newly identified *** identified 21 extended sources and 23 sources exhibiting spectral curvature above 10 ***,we identified 44 variable sources above 1 GeV.

关键词： gamma-rays:diffuse background methods:data analysis catalogs gamma-rays:general

Platinum-based ternary catalysts for the electrooxidation of ethanol

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Particuology 2021年第5期19卷 169-186页

作者： Guangxing Yang Qiao Zhang Hao Yu feng peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641PR China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510641PR China School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006PR China

Direct ethanol fuel cell(DEFC)as a promising device for converting chemical energy to electricity has been paid ever-increasing ***,the slow kinetics of ethanol electrooxidation at an anode hinders the application of *** Pt is the best catalyst among all the pure metal catalysts,it still has a relatively poor ability to break the Csingle bondC bond,is deactivated by the accumulated CO_(ad) intermediates,and undergoes unwanted desired structure change over long-term *** recent years,the addition of other metals to form binary,ternary,and quaternary catalysts have significantly improved electroactivity and *** catalysts can have numerous element combinations and complicated architectures and,therefore,have been the subject of considerable *** this review,most of the reported ternary catalysts will be summarized and categorized according to their structure while discussing the essence of the role of each component.

关键词： Direct ethanol fuel cell Ethanol oxidation reaction Ternary catalyst Composition-reactivity relationship

Studies on apoptosis in bone tumor cells induced by ^(153)Sm

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Nuclear Science and Techniques 2004年第2期15卷 106-110页

作者： ZHUShou-peng XIAODong HANXiao-feng InstituteofRadiologicalMedicine SoochowUniversitySuzhou215007

The apoptosis in human bone tumor cells induced by internal irradiation with 153Sm was studied. The morphological changes in bone tumor cells were observed by electronic and fluorescent microscopy, as well as DNA agarose gel eletrophoresis. DNA chain fragmentation, microautoradiographic tracing and the inhibition rate of prolif- eration in bone tumor cells exposed to 153Sm with different duration time were examined. It was demonstrated that the bone tumor cells exposed to 153Sm displayed nuclear fragmentation, pyknosis, margination of condensed chroma- tin, and formation of membrane bounded apoptotic bodies, whereas the percentage of DNA chain fragmentation of bone tumor cells increases in direct proportion to the duration of irradiation with153 Sm, as well as DNA ladder for- mation in apoptotic cells. Also a marked inhibition effect of proliferation in bone tumor cells after exposure with 153Sm was observed.

关键词：细胞凋亡骨肿瘤钐核断裂 ^153Sm-EDTMP

A Low Power Non-Volatile LR-WPAN Baseband Processor with Wake-Up Identification Receiver

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China Communications 2016年第1期13卷 33-46页

作者： YU Shuangming feng peng WU Nanjian State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences

The paper proposes a low power non-volatile baseband processor with wake-up identification(WUI) receiver for LR-WPAN *** consists of WUI receiver,main receiver,transmitter,non-volatile memory(NVM) and power management *** main receiver adopts a unified simplified synchronization method and channel codec with proactive Reed-Solomon Bypass technique,which increases the robustness and energy efficiency of *** WUI receiver specifies the communication node and wakes up the transceiver to reduce average power consumption of the *** embedded NVM can backup/restore the states information of processor that avoids the loss of the state information caused by power failure and reduces the unnecessary power of repetitive computation when the processor is waked up from power down *** baseband processor is designed and verified on a FPGA *** simulated power consumption of processor is 5.1uW for transmitting and 28.2μW for *** WUI receiver technique reduces the average power consumption of transceiver *** the transceiver operates 30 seconds in every 15 minutes,the average power consumption of the transceiver can be reduced by two orders of *** NVM avoids the loss of the state information caused by power failure and energy waste caused by repetitive computation.

关键词： LR-WPAN wake-up identification receiver synchronization non-volatile memory baseband processor digital integrated circuit low power chip design

Superconductivity at 31 K in Alkaline Metal—Doped Cobalt Oxides

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Chinese Physics Letters 2003年第5期20卷 725-728页

作者： WENHai-Hu YANGHia-peng LUXi-feng YANJing NationalLaboratoryforSuperconductivity InstituteofPhysicsandCenterforCondensedMatterPhysicsChineseAcademyofSciencesPOBox603Beijing100080

By using a simple solid reaction method, we have fabricated alkaline metal doped cobalt oxides AnxCoO2 (An = Na, K). The magnetic measurement shows a superconducting-like diamagnetic signal at 31K based on a strong superparamagnetic signal. Below 31K, the magnetization hysteresis loops contain a strong rough linear superparamagnetic background and a superconducting hysteresis. The typical magnetization hysteresis loops for a type-II superconductor are found. Preliminary resistive data also show a fast dropping of resistance below Tc. These give indication of superconductivity below 31K in AnxCoO2 (An = Na, K).

关键词：氧化钴超导电性掺杂反磁性磁滞现象超顺磁性碱金属掺杂

Turn Our Corporation Into a World Market Oriented Enterprise—An interview with *** feng,President of anghai Non-ferrous Metals Industry Corporation

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上海金属.有色分册 1989年第6期 3-6页

作者： peng feng,President of anghai Non-ferrous Metals Industry Corporation

Recently *** feng,President of Shanghai Non-ferrous Metals IndustryCorporation,had an interview with *** Tong and *** Yongjiang,correspondnts of our magazine《Shanghai Metals》.During the interview,*** answered a series of questions put to him by the correspondents in relationto the implementation of the policy of opening to the outside world by his *** correspondents felt enlightened and encouraged and would like to letthe vast number of readers share their gains.

关键词： In Turn Our Corporation Into a World Market Oriented Enterprise World

Recent progress in superhydrophobic coating on Mg alloys:A general review

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Journal of Magnesium and Alloys 2021年第5期9卷 1479-1496页

作者： feng peng Dongdong Zhang Xuanyong Liu Yu Zhang Department of Orthopedics Guangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhou 510080GuangdongChina State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Cixi Center of Biomaterials Surface Engineering Shanghai Institute of CeramicsChinese Academy of SciencesNingbo 315300China

Magnesium(Mg)is a vital engineering material owing to its light weight and excellent mechanical ***,poor corrosion resistance limits its widely applications as well as its economic ***,surface modification is essential for Mg and its *** the various coatings,superhydrophobic coating,which is inspired by nature,has received increasing attentions in the past *** a water contact angle larger than 150°,superhydrophobic coating can provide sufficient protection for Mg-based *** model of superhydrophobic states and the protection mechanism of superhydrophobic coating are discussed in this ***,the methods for fabricating superhydrophobic coatings on Mg alloys are ***,some functional superhydrophobic coatings on Mg alloys are ***,the challenges and future directions are *** hope that this paper will provide a serviceable review for future research on superhydrophobic coatings on Mg alloys.

关键词： Magnesium alloys Superhydrophobic coatings Corrosion resistance

Element nodal computation-based radial integration BEM for non-homogeneous problems

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Acta Mechanica Sinica 2013年第3期29卷 429-436页

作者： Hai-feng peng Kai Yang Xiao-Wei Gao State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology

This paper presents a new strategy of using the radial integration boundary element method （RIBEM） to solve non-homogeneous heat conduction and thermoelasticity problems. In the method, the evaluation of the radial in-tegral which is used to transform domain integrals to equivalent boundary integrals is carried out on the basis of elemental nodes. As a result, the computational time spent in evaluating domain integrals can be saved considerably in comparison with the conventional RIBEM. Three numerical examples are given to demonstrate the correctness and computational efficiency of the proposed approach.

关键词： Radial integral Boundary element method Non-homogeneous problem Heat conduction Thermoe-lasticity