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COMPUTERIZED PREDICTION OF INTERACTION PARAMETERSAND PHASE DIAGRAMS OF CONTINUOUS SOLID SOLUTION OFBINARY ALLOY SYSTEMS

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Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 216-220页

作者： J. Guo (Department of Physics, Guangxi University, nanning 530004, China) Guangxi Univ Nanning China

The artificial neural network method has been applied to the relationship between the atomic parameters and intemction packeters of binary alloy Phases, and the principle of thermodynamics in combination with artificial neural network method has been used for the computerized phase diagrams of continuous solid solution of bigamy alloy systems. The computerized phase diagrams well agree with the real phase diagmms.

关键词： antificial neural network interaction parameter computerized phase diagram

Luminosity-peak energy relation in the decay phases of gamma-ray burst pulses

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Science China(Physics,Mechanics & Astronomy) 2010年第1期53卷 163-170页

作者： LU RuiJing & LIANG EnWei Physical Science & Technology College, Guangxi University, nanning 530004, China 1. Physical Science & Technology College Guangxi University Nanning 530004 China

Using time-resolved spectral data for a sample of 30 pulses in 27 bright GRBs detected with CGRO/BATSE, we investigate the luminosity-peak energy relation (L-E p relation) in the decay phases of these pulses. A tight L-E p relation is found for most of the pulses, but its power law index is various among pulses, which is normally distributed at 1.84±0.60(1σ) for the pulses in our sample, roughly consistent with the L-E p relation within a GRB and the isotropic gamma-ray energy-E p relation among GRBs. The large scatter of the power law index cannot be explained with both the statistical or observational effects and it may be an intrinsic feature, indicating that no universal L-E p relation would be expected among GRBs/pulses. This may strongly weaken the cosmological use of this relation.

关键词： gamma ray bursts observations statistical luminosity-peak energy relation

A rhizobia strain isolated from root nodule of gymno-sperm Podocarpus macrophyllus

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Science China(Life Sciences) 2007年第2期50卷 228-233页

作者： HUANG BaoLing, LU ChengQun, WU Bo & FAN LiQin 1 Forestry College, Guangxi University, nanning 530004, China 2 Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization, nanning 530004, China 1. Forestry College Guangxi University Nanning 530004 China 2. Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization Nanning 530004 China

Symbiotic nitrogen fixation of rhizobia and leguminous plants is considered as the most important biologic nitrogen fixation system on earth. Symbiotic nodulation of gymnosperm Podocarpus macro-phyllus and rhizobia has never been reported. In this study, 11 endophytic bacteria strains were isolated from root nodules of P. macrophyllus and its variation P. macrophyllus var. maki. The plant infection tests on these strains indicated that the isolated strains could be nodulated on P. macrophyllus plants, and weak nitrogenase activity of nodules was found in acetylene reduction method. According to the physiological and biochemical characteristics of the 11 strains, GXLO 02 was selected as the representative strain. 16S rDNA full-length sequence analysis of GXLO 02 confirmed that the representative strain GXLO 02 belongs to Rhizobium sp.

关键词： Podocarpus macrophyllus P. macrophyllus var. maki rhizobia physiological and biochemical characteristics 16S rDNA sequence

Gamma-ray bursts in the Swift-Fermi era:Confronting data with theory

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Science China(Physics,Mechanics & Astronomy) 2010年第S1期53卷 14-23页

作者： LIANG EnWei Physical Science & Technology College,Guangxi University,nanning 530004,China Guangxi Univ Phys Sci & Technol Coll Nanning 530004 Peoples R China

With the prompt slewing capability of the X-ray and UV-optical telescopes onboard the Swift mission and with the gamma-ray large area telescope onboard the Fermi mission,gamma-ray bursts(GRBs) are now accessible in a full time window and in all electromagnetic wavelengths for the *** observational breakthroughs have been made in recent years.I present here a brief review of some observational breakthroughs with the two missions,focusing on how these breakthroughs have revolutionized our understanding of the nature of this phenomenon and puzzles as well as challenges of confronting the conventional models with data.

关键词： radiation mechanism gamma rays bursts high energy phenomenon

Correlation between pulse-width and peak luminosity of single-pulse long gamma-ray bursts

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Science China(Physics,Mechanics & Astronomy) 2010年第S1期53卷 69-72页

作者： DENG JiaGan & LIANG EnWei Department of Physics,Guangxi University,nanning 530004,China Guangxi Univ Dept Phys Nanning 530004 Peoples R China

With a sample of 21 single-pulse GRBs with redshift measurement and a sample of 65 single-pulse GRBs with pseudo redshift estimated by the luminosity-spectral lag relation,we show that the peak luminosities of GRB pulses are anti-correlated with pulse width,indicating that longer-pulses tend to be dimmer in the gamma-ray *** anti-correlation is accessible with an internal shock scenario.

关键词： gamma-rays:bursts-gamma-rays:observations

Preparation of new sunscreen materials Ce_(1-x)Zn_xO_(2-x) via solid-state reaction at room temperature and study on their properties

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Rare Metals 2010年第2期29卷 149-153页

作者： WU Wenwei, LI Shushu, LIAO Sen, XIANG Feng, and WU Xuehang School of Chemistry and Chemical Engineering, Guangxi University, nanning 530004, China School of Chemistry and Chemical Engineering Guangxi University

Superfine cerium-zinc oxides Ce1-xZnxO2-x with x = 0, 0.1, 0.3, 0.5, and 1.0 were obtained by grinding Ce（SO4）2·4H2O, ZnSO4·7H2O and NH4HCO3 under the condition of surfactant PEG-400 being present at room temperature, washing the mixture with water to remove soluble inorganic salts, drying at 80°C, and *** precursor and its calcined samples were characterized using thermogravimetry and differential thermal analyses（TG/DTA）, UV-vis absorption spectroscopy, X-ray powder diffraction（XRD）, and scanning electron microscopy（SEM）.The results showed that superfine Ce1-xZnxO2-x behaved as an excellent UV-shielding *** ZnO-doped CeO2 can facilitate the formation of crystalline state *** catalytic ability of products used in air oxidation of castor oil was *** results showed that the catalytic abilities of products decreased with increasing zinc amount.

关键词： cerium oxide zinc oxide solid-state reaction UV absorbency catalytic properties

Spectral properties of Fermi/GBM gamma-ray bursts and the GeV emission detection rate with Fermi/LAT

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Science China(Physics,Mechanics & Astronomy) 2010年第S1期53卷 73-77页

作者： LV HouJun,LIANG EnWei & TONG XiaoFeng Department of Physics,Guangxi University,nanning 530004,China 1. Department of Physics Guangxi University Nanning 530004 China

With a sample of 58 Fermi/GBM GRBs detected before 2009 May,we compare the spectral properties of GBM GRBs with those detected by CGRO/BTASE and *** results show that the spectral index distributions are very consistent with those observed by ***,the Ep distribution is quite different from that observed with BATSE and *** GBM GRBs tend to be softer than the BATSE sample,but harder than the HETE-2 *** may be due to the instrumental selection effects and artificial sample effect on the BATSE *** distribution of the pseudo redshifts derived from the luminosity indicator based on the Amati-relation shows rough consistency with the spectroscopic redshifts of Swift *** estimate the detection rate of GBM GRBs with LAT based on the observed spectrum in the GBM band,and the inferred burst ratio of LAT detection with over 5 photons to GBM detection is 6%,yielding a detection rate pf 12 GRBs/yr with over 5 photons in the 1-300 GeV *** is roughly consistent with the results in the first half year of Fermi *** low detection rate compared with theoretical predictions is a key for revealing the radiation mechanisms and particle acceleration of the prompt gamma-rays.

关键词： gamma-ray bursts high energy phenomenon spectrum statistics

Cloning, Expression and Identification of a New Trehalose Synthase Gene from Thermobifida fusca Genome

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Acta Biochimica et Biophysica Sinica 2004年第7期36卷 477-484页

作者： Yu-Tuo WEI, Qi-Xia ZHU1, Zhao-Fei LUO1, Fu-Shen LU1, Fa-Zhong CHEN1, Qing-Yan WANG1, Kun HUANG,Jian-Zhong MENG, Rong WANG, and Ri-Bo HUANG*Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization, Guangxi University, nanning 530004, China 1Sinozyme Biotech Co. Ltd., nanning 530004, China Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization Guangxi University Nanning 530004 China

A new open reading frame in Thermobifida fusca sequenced genome was identified to encode a new trehalose synthase, annotated as “glycosidase” in the GenBank database, by bioinformatics searching and experimental validation. The gene had a length of 1830 bp with about 65% GC content and encoded for a new trehalose synthase with 610 amino acids and deduced molecular weight of 66 kD. The high GC content seemed not to affect its good expression in E. coli BL21 in which the target protein could account for as high as 15% of the total cell proteins. The recombinant enzyme showed its optimal activities at 25 °C and pH 6.5 when it converted substrate maltose into trehalose. However it would divert a high proportion of its substrate into glucose when the temperature was increased to 37 °C, or when the enzyme concentration was high Its activity was not inhibited by 5 mM heavy metals such as Cu2+, Mn2+, and Zn2+ but affected by high concentration of glucose. Blasting against the database indicated that amino acid sequence of this protein had maximal 69% homology with the known trehalose synthases, and two highly conserved segments of the protein sequence were identified and their possible linkage with functions was discussed.

关键词： trehalose synthase Thermobifida fusca open reading frame (ORF) gene expression

CRYSTAL STRUCTURE AND X-RAY POWDER DIFFRACTION DATA FOR RE COMPOUND HoNiSb

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中国有色金属学会会刊：英文版 1995年第3期5卷 71-73页

作者： Zeng, Lingmin Li, Jungqin Zhang, Liping Zhuang, Yinghong Hao, Jianmin (Institute of Materials Science, Guangxi University, nanning 530004)(Tianjin Electronic Materzals Research Institute) Guangxi Univ Nanning China

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关键词： RE compound HoNiSb X-ray diffraction data crystal structure