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Influences of ^7Li enrichment on Th-U fuel breeding for an Improved Molten Salt Fast Reactor(IMSFR)

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Nuclear Science and Techniques 2017年第7期28卷 105-113页

作者： guang-Chao Li Yang Zou Cheng-Gang Yu Jian-Long Han Jin-Gen Chen hong-Jie xu Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China CAS Innovative Academies in TMSR Energy System Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049China

The molten salt fast reactor(MSFR) shows great promise with high breeding ratio(BR),large negative temperature coefficient of reactivity,high thermal-electric conversion efficiency,inherent safety,and online *** on an improved MSFR optimized by adding axial fertile salt and a graphite reflector,the influences of ~7Li enrichment on Th-U breeding are investigated,aiming to provide a feasible selection for the molten salt with high fissile breeding and a relatively low technology requirement for ~7Li *** the self-developed molten salt reactor reprocessing sequence based on SCALE6.1,the burn-up calculations with online reprocessing are carried *** are explored including BR,^(233)U production,double time(DT),spectrum,~6Li inventory,neutron absorption,and the tritium *** results show that the Li enrichment of 99.95% is appropriate in the fast fission *** this case,BR above 1.10 can be achieved for a long time,corresponding to the ^(233)U production of130 kg per year and DT of 36 *** 80 years' operation,the tritium production for 99.5% is only about 7kg,and there is no obvious increase compared to that for 99.9995%.

关键词：繁殖率熔盐富集铀燃料裂变反应堆快堆在线处理负温度系数

Activation Effect of Cathartic Natural Compound Rhein to CFTR Chloride Channel

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Chemical Research in Chinese Universities 2006年第3期22卷 312-314页

作者： SHI Lin-lin xu Li-na HOU Shu-guang LIN Sen YANG hong MA Tong-hui Membrane Channel Research Laboratory Northeast Normal University Changchun 130024 P. R. China Faculty o Life Sciences Liaoning Normal University Dalian 116029 P. R. China China-Japan Union Hospital Jilin University Changchun 130033 P. R. China

The cystic fibrosis transmembrane conductance regulator （CFFR） is a cAMP-activated chloride channel expressed in intestinal exoerine glands, which plays a key role in intestinal fluid secretion. A natural anthraquinone ac tivator of CFTR Cl^- channel, rhein, was identified by screening 217 single compounds from Chinese herbs via a cellbased halide-sensitive fluorescent assay. Rhein activates CFTR Cl^- transportation in a dose-dependent manner in the presence of cAMP with a physiological concentration. This study provides a novel molecular pharmacological mechanism for the laxative drugs in Treditional Chinese Medicine such as aloe, cascara and senna.

关键词： CFTR chloride channel Anthraquinone Laxative drug

Ne^(2+) Ion Irradiation Induced Swelling Effects in Pyrochlore Ho_(2)Ti_(2)O_(7) by Using a GIXRD Technique

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Chinese Physics Letters 2011年第6期28卷 202-205页

作者： LI Yu-hong xu Chun-Ping GAO Chao WANG Zhi-guang School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

We carry out 400 keV Ne^(2+) ion irradiation damage experiments at cryogenic temperature(about 77 K)on polycrystalline Ho_(2)Ti_(2)O_(7) *** irradiation fluences range from 2×10^(14) to 1.3×10^(15) ions/cm^(2),corresponding to the peak ballistic displacement damage of 0.075–0.487 in units of displacement per atom(dpa).The value indicates the statistical average of the fractional number of lattice atoms which have experienced a lattice ***−induced structural evolution is examined by using grazing incidence x-ray diffraction(GIXRD)at x-ray anglesγ=0.25°and 3°.It is found that the irradiated layer is volumetrically swelled as compared with the underlying non-irradiated substrate and the volume increase in the irradiated layer is contributed mainly to the irradiated ion fluence.

关键词： displacement damage carry

A Study on Anti-oxidative Activity of Soybean Peptideswith Linoleic Acid Peroxidation Systems

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Chemical Research in Chinese Universities 2006年第2期22卷 205-208页

作者： xu Li LI hong-mei HUANG Yi-bing WANG Hua NIE guang-jun ZHANG xue-zhong Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education Jilin University Changchun 130021 P. R. China College of Food Engineering Jilin Agricultural University Changchun 130018 P. R. China China-Japan Union Hospital of Jilin University Changchun 130033 P. R. China

Soybean bioactive peptides（SBPs） were prepared from the isolated soybean protein by proteolysis with an alkaline protease, alcalase, at 50℃ and pH = 8.0. The dependence of hydrolysis time on hydrolysis degree and molecular weight distribution were examined. The hydrolysate was fractionated on a Sephadex G-25 column and the anti-oxidative activities of the fractions were detected by the method of pyrogallol auto-oxidation. The average chain length of soybean peptides that have anti-oxidative activity was estimated to be about 7. The anti-oxidative properties of the soy- bean peptide were also studied by using linoleic acid peroxidation systems. The optimal condition of the peroxidation system was set up, Vc/Cu^2 ＋ as the inducer at pH = 7.4 and 25 ℃. In addition, soybean peptides show higher antioxidative activity compared with GSH.

关键词： Soybean bioactive peptides Anti-oxidative activity Linoleic acid peroxidation system

Effect of arsenic trioxide on human hepatoma cell line BEL-7402 cultured in vitro

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World Journal of Gastroenterology 2000年第5期6卷 681-687页

作者： hong Yu xu You Lin Yang Yuan Yuan Gao Qiao Li Wu guang Qiang Gao Department of Digestive Disease the First Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina Neurologic Cytology Unit The First Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina Department of Medical Laboratory Science The First Hospital of Harbin Medical UniversityHarbin 150001Heilongjiang ProvinceChina

AIM To study the effect of a varyingconcentrations of arsenic trioxide on humanhepatoma cell line BEL-?402 cultured in vitro andits mechanism of *** The BEL-7402 cells were treatedwith arsenic trioxide（at the concentrations of0.5,1,2 μmol/L,respectively）for 4 *** cell growth and proliferation wereobserved by cell counting and cell-growth *** changes were studied *** cytometry was usedto assay celI-DNA distribution and the proteinexpression of Bcl-2 and Bax detected byimmunocytochemical *** The cell growth was significantlyinhibited by varying concentrations of arsenictrioxide as revealed by cell counting and cell-growth curve,which was dose- and *** trioxide treatment at 0.5,1and 2 μmol/L resulted in a sub-G1 cell peak,theapoptosis rate of the control group was 9.31%and that of 0.5 μmol/L arsenic trioxide 15.53%,no significant difference was seen between *** apoptosis rates of 1,2 μmol/L arsenictrioxide were 19.10% and 21.87% respectively,which were much higher（both P0/G1 phase cells and increase of Sphase cells were observed by flow cytometry,suggesting the inhibition effect of 0.5,1,2 μmol/L arsenic trioxide on BEL-7402 cell lay in the G0/G1 *** changes such asintact cell membrane,nucleic condensation,apoptotic body formation were seen undertransmission electronmicrescopy,whereas the0.5 mol/L arsenic trioxide-treated BEL-7402cells showed decrease of nucleocytoplasmicratio,round nucleus,well-differentiatedorganelles in the *** processes andmicrovilli on the cell surface of the experimentalgroups under scanning electron microscopy weresignificantly *** expressions ofBcl-2 and Bax were detected in 1 and 2 μmol/Larsenic trioxide-treated cells,these were 46%,87.33% and 83.08%,95.83% respectively,among which that of Bax was more *** trioxide treatment at

关键词： arsenic trioxide hepatoma flow cytometry immunohistochemistry microscopy electron apoptosis gene expression

Anomalous chiral transports and spin polarization in heavy-ion collisions

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Nuclear Science and Techniques 2020年第6期31卷 30-51页

作者： Yu-Chen Liu xu-guang Huang Physics Department and Center for Particle Physics and Field Theory Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China

Relativistic heavy-ion collisions create hot quark–gluon plasma as well as very strong electromagnetic(EM)and fluid vortical *** strong EM field and vorticity can induce intriguing macroscopic quantum phenomena such as chiral magnetic,chiral separation,chiral electric separation,and chiral vortical effects as well as the spin polarization of *** phenomena provide us with experimentally feasible means to study the nontrivial topological sector of quantum chromodynamics,the possible parity violation of strong interaction at high temperature,and the subatomic spintronics of quark–gluon *** studies,both in theory and in experiments,are strongly connected with other subfields of physics such as condensed matter physics,astrophysics,and cold atomic physics,and thus form an emerging interdisciplinary research *** give an introduction to the aforementioned phenomena induced by the EM field and vorticity and an overview of the current status of experimental research in heavy-ion *** also briefly discuss spin hydrodynamics as well as chiral and spin kinetic theories.

关键词： Heavy-ion collision Chiral magnetic effect Spin polarization Quark–gluon plasma

How can FAST improve study of the pulsar emission mechanism and magnetospheric dynamics?

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Research in Astronomy and Astrophysics 2019年第2期19卷 55-64页

作者： hong-guang Wang Guo-Jun Qiao Yuan-Jie Du Ji-guang Lu Ren-Xin xu Ke-Jia Lee Xiong-Wei Liu School of Physics and Electronic Engineering Guangzhou University Department of Astronomy Peking University Qian xuesen Laboratory of Space Technology China Academy of Space Technology National Astronomical Observatories Chinese Academy of Sciences School of Physics and Electronic Information China West Normal University

The Five-hundred-meter Aperture Spherical radio Telescope(FAST) has the potential to discover many new pulsars and new phenomena. In this paper we mainly concentrate on how FAST can impact study of the pulsar emission mechanism and magnetospheric dynamics. Several observational programs heading to this direction are reviewed. To make full use of the superior performance of FAST and maximize the scientific outcome, these programs can be arranged in different phases of FAST according to their demands for observational conditions. We suggest that programs can be performed following the test phase, which are observations of multifrequency mean pulse profiles, anomalous X-ray pulsars(AXPs)/soft gamma-ray repeaters(SGRs), mode changing, drifting subpulse and nulling. The long-term monitoring can be carried out for mode changing, AXPs/SGRs and precessional pulsars. Others programs, including polarization observations of radio and γ-ray pulsars, searching for weak pulse components, and multifrequency observations of subpulse drifting, microstructure and giant pulses, can be conducted in all the normal operating phases(the first and second phases). These programs will push forward the frontier in this field in different respects. The search for sub-millisecond pulsars and follow-up observations of their emission properties are very important projects for FAST, but they may be covered by other papers in this mini-volume; therefore,they are not discussed here.

关键词： pulsars:general pulsars: radio emission radiation mechanisms:non-thermal

Fine Structural and Carbon Source Analysis for Diamond Crystal Growth using an Fe-Ni-C System at High Pressure and High Temperature

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Chinese Physics Letters 2012年第4期29卷 229-231页

作者： FAN Xiao-hong xu Bin NIU Zhen ZHAI Tong-guang TIAN Bin School of Material Science and Engineering Shandong UniversityJi’nan 250101 School of Materials Science and Engineering Shandong Jianzhu UniversityJi’nan 250101 Department of Chemical and Materials Engineering University of KentuckyLexingtonUSA

Diamond is synthesized in an Fe-Ni-C system at high pressure and high temperature,the C sp^(3) content profile through different thicknesses of interface between diamond and the catalyst film is measured by using electron energy loss *** is found that the Csp^(3) content varies from 87.33% to 78.15% when the measured position is located at the inner face near the diamond and then changes to 6 μm further *** electron microscope examinations show that there are different phases in the interface,such as Fe3C,γ-(Fe,Ni),and graphite,but the graphite phase diminishes gradually towards the inner face of the *** results profoundly indicate that the carbon atoms,required for diamond growth,could only come from the carbon-rich phase,Fe3C,but not directly from the *** is possible that carbon atoms from the graphite in the interface first react with Fe atoms to produce carbide Fe3 C during diamond synthesis at high pressure and high *** Fe3 C finally decomposes into carbon atoms with the sp^(3) electron state at the interface to form the diamond.

关键词： spectroscopy carbide Diamond

Stabilization of Short Wavelength Resistive Ballooning Modes by Ion-to-Electron Temperature and Gradient Ratios in Tokamak Edge Plasmas

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Chinese Physics Letters 2020年第6期37卷 13-16页

作者： Jian-Qiang xu Xiao-Dong Peng hong-Peng Qu guang-Zhou Hao Southwestern Institute of Physics Chengdu 610041China

We numerically investigate the effects of ion-to-electron temperature ratio T_i/T_e and temperature gradient ratioη_i/η_e on resistive ballooning inodes(RBMs)under tokamak edge plasma *** results show that the growth rates of the RBMs exhibit the characteristic of a quite broad poloidal wavenumber spectrum in the cold ion *** growth rate spectrum becomes narrower and the peak of the spectrum shifts from the short to long wavelength side with increasing T_i/T_e andη_i/η_*** electron temperature gradient has a very weak effect on the stability of ***,the ion-to-electron temperature ratio and the temperature gradient ratio have strong stabilizing effects on short-wavelength RBMs,while they have relatively weak effects on long-wavelength RBMs.

关键词： Resistive spectrum Electron