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稀有金属材料与工程 2012年第S1期41卷 344-349页

作者： Guo Chun1.2,Chen Jianmin1.Zhou Jiansong1.Zhao Jierong1.2,Wang Lingqian1.2,yu Youjun1.2,Zhou Huidi 1.1.Lanzhou Institute of Chemical Physics,{1. {1. of sciences,Lanzhou 730000,china 2 Graduate University of chinese academy of sciences,beijing 1.0039,china chinese Acad Sci Lanzhou Inst Chem Phys Lanzhou 730000 Peoples R China chinese Acad Sci Grad Univ Beijing 100039 Peoples R China

TiB2/TiB/TiNx(x=1.0.3)/Ti composite coating was prepared on pure Ti by laser surface alloying by using powders of boron as starting *** composite coating was examined by X-ray diffraction(XRD),high-resolution transmission electron microscopy(HRTEM)and scanning electron microscopy(SEM).The friction and wear properties of the composite coating were examined using a pin-on-disk tester under dry sliding wear *** results showed that the top surface of the composite coating was mainly composed of TiB2,TiB,TiN0.3,TiN and Ti phases,while the interface of the composite coating was composed of TiB and Ti *** composite coating showed sticklike structure near the top surface,and dendrites structure near the *** friction and wear test showed that the composite coating had better wear resistance than pure Ti due to their higher microhardness than that of pure Ti substrate.

关键词： pure Ti laser surface alloying TiB2 composite coating friction and wear property

Most Tibetan weedy barleys originated via recombination between Btr1.and Btr2 in domesticated barley

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Plant Communications 2024年第5期5卷 163-175页

作者： Guangqi Gao Luxi Yan yu {1. yu Guo Congcong Jiang Qiang He Sarah Tasnim Zongyun Feng Jun Liu jing Zhang Takao Komatsuda Martin Mascher Ping Yang State Key Laboratory of Crop Gene Resources and Breeding/Key Laboratory of Grain Crop Genetic Resources Evaluation and Utilization(MARA)/Institute of Crop sciences Chinese Academy of Agricultural SciencesBeijing 100081China College of Agronomy Sichuan Agricultural UniversityChengdu 611130China Leibniz Institute of Plant Genetics and Crop Plant Research 06466 SeelandGermany Crop Research Institute Shandong Academy of Agricultural SciencesJinan 250100China

Tibetan weedy barleys reside at the edges of qingke(hulless barley)fields in Tibet(Xizang).The spikes of these weedy barleys contain or lack a brittle rachis,with either two-or six-rowed spikes and either hulled or hulless grains at *** the brittle rachis trait of Tibetan weedy barleys is similar to that of wild barley(Hordeum vulgare *** Thell.),these plants share genetic similarity with domesticated *** origin of Tibetan weedy barleys continues to be ***,we show that most Tibetan weedy barleys originated from cross-pollinated hybridization of domesticated barleys,followed by hybrid self-pollination and recombination between Non-brittle rachis 1.btr1.and 2(btr2).We discovered the specific genetic ancestry of these weedy barleys in South Asian *** weedy barleys exhibit lower genetic diversity than wild and chinese landraces/cultivars and share a close relationship with qingke,genetically differing from typical eastern and western barley *** classified Tibetan weedy barleys into two groups,brittle rachis(BR)and non-brittle rachis(NBR);these traits align with the haplotypes of the btr1.and btr2 *** wild barleys carry haplotype combinations of Btr1.and Btr2,each showing lower proportions in a population,the recombinant haplotype BTR2H8+BTR1.24 is predominant in the BR *** block analysis based on whole-genome sequencing revealed two recombination breakpoints,which are present in 80.6%and 1..8%of BR acces-sions according to marker-assisted *** events between wild and domesticated barley were rarely *** support the notion that Tibetan weedy barleys originated via recom-bination between Btr1.and Btr2 in domesticated barley.

关键词： Tibetan weedy barley agriocrithon de-domestication out-pollination recombination brittle rachis

Responses of soil respiration in non-growing seasons to environmental factors in a maize agroecosystem,Northeast china

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chinese Science Bulletin 2010年第24期55卷 2723-2730页

作者： LI RongPing1,2,3, ZHOU GuangSheng1,4 & WANG yu1,3 1 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, chinese academy of sciences, {1. 100093, china 2 Institute of Atmospheric Environment, china Meteorological Administration, Shenyang 110016, china 3 Graduate University of chinese academy of sciences, {1. 100049, china 4 chinese academy of Meteorological {1.}, {1. 100081, china State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences Beijing 100093 China Institute of Atmospheric Environment China Meteorological Administration Shenyang 110016 China Graduate University of chinese academy of sciences Beijing 100049 China chinese {1. of Meteorological sciences Beijing 100081 China

Based on continuous three-year measurements (from 2004 to 2007) of eddy covariance and related environmental factors, environmental controls on variation in soil respiration (Rs) during non-growing season were explored in a maize agroecosystem in Northeast china. Our results indicated that during non-growing seasons, daily Rs was 1.08-4.08 g CO2 m-2 d-1. and the lowest occurred in late November. The average Rs of non-growing season was 456.06 ± 20.01.g CO2 m-2, accounting for 1.% of the gross primary production (GPP) of the growing season. Additionally, at monthly scale, the lowest value of Rs appeared in January or February. From the beginning to the end of non-growing season, daily Rs tended to decrease first, and then increase to the highest. There was a significant quadratic curve relationship between Rs and soil temperature at 1. cm depth when soil temperature was more than 0°C (P1., with the explaining ratio of 38%-70%. When soil water content was more than 0.1.m3 m-3, soil moisture at 1. cm depth was significantly parabolically correlated with Rs (P1., explaining the rate of 1.%-60%. Based on all the data of soil temperature of more than 0°C, a better model for Rs was established by coupling soil temperature and moisture, which could explain the rate of up to 53%-79%. Meanwhile, the standard error of regression estimation between the values of prediction and observation for Rs could reach 2.7%-1..8%. Rs in non-growing season can account for 22.4% of Rs in growing season, indicating that it plays a critical role in assessing the carbon budget in maize agroecosystem, Northeast china.

关键词：中国东北地区农田生态系统生长季节土壤呼吸环境因素玉米土壤含水量反应

An improved method for evaluating the seasonal variability of total suspended sediment flux field in the Yellow and East china Seas

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International Journal of Sediment Research 2011年第1期26卷 1-14页

作者： PANG Chongguang~1,yu Wei~2,YANG Yang~3,and HAN Danxiu~4 Institute of Oceanology,chinese {1. of sciences,Qingdao 266071,china, 2 Institute of Oceanology,chinese {1. of sciences,Qingdao 266071,china,Graduate School of chinese academy of sciences,beijing 100039,china 3 Institute of Oceanology,chinese {1. of sciences,Qingdao 266071,china,Graduate School of chinese academy of sciences,beijing 100039,china 4{1.} University of Petroleum,beijing 102249,china [a] Doctor Researcher Institute of Oceanology chinese {1. of sciences Qingdao 266071 china [b] Institute of Oceanology chinese {1. of sciences Qingdao 266071 china Graduate School of chinese academy of sciences beijing 1.0039 china [c] Institute of Oceanology chinese {1. of sciences Qingdao 266071 china Graduate School of chinese academy of sciences beijing 1.0039 china [d]{1. University of Petroleum beijing 1.2249 china

The suspended sediment flux field in the Yellow and East china Seas(YECS) displays its seasonal variability.A new method is introduced in this paper to obtain the flux field via retrieval of ocean color remote sensing data,statistical analysis of historical suspended sediment concentration data,and numerical simulation of three-dimensional(3D) flow *** components of the sediment flux field include(i) surface suspended sediment concentration inverted from ocean color remote sensing data;(ii) vertical distribution of suspended sediment concentration obtained by statistical analysis of historical observation data;and(iii) 3D flow field modeled by a numerical *** the improved method,the 3D suspended sediment flux field in the YECS has been *** comparison with the suspended sediment flux field solely based on the numerical simulation of a suspended sediment transport model,the suspended sediment flux field obtained by the improved method is found to be more *** 3D suspended sediment flux field from ocean colour remote sensing and in situ observation are more closer to the ***,by quantitatively analyzing the newly obtained suspended sediment flux field,the quantity of sediment erosion and deposition within the different regions can be *** sediment exchange between the Yellow Sea and the East china Sea can be *** mechanism of suspended sediment transport in the YECS can be better *** particular,it is suggested that the long-term transport of suspended sediment is controlled mainly by the circulation pattern,especially the current in winter.

关键词： Suspended sediment flux field Seasonal variability Yellow and East china Seas Regression equation Numerical simulation

Approach to Quantitative Detection of CD1.6 with a Label-free Protein Biosensor Based on Imaging Ellipsometry

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生物物理学报 2009年第S1期25卷 300-301页

作者： yu Niu1. Ying Zhang2, 3, Xiyun Yan2, Gang Jin 1.Institution of mechanics, chinese academy of sciences, {1., china 2 Institution of biophysics, chinese academy of sciences, {1., china 3 Institution of biophysics, chinese academy of sciences, {1., china Institution of mechanics, chinese academy of sciences, {1., china

CD1.6 glycoprotein, belonging to the immunoglobulin gene superfamily, plays a unique role in heterophilic cell-cell interactions as a calcium ions independent cell adhesion

关键词： biosensor protein micro-array Imaging ellipsometry CD1.6 detection.

Growth characteristics and response to climate change of Larix Miller tree-ring in china

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Science china Earth {1. 2010年第6期53卷 871-879页

作者： SUN yu1.4, WANG LiLi1.2,3, CHEN Jin5, DUAN JianPing1.4, SHAO XueMei1.2 & CHEN KeLong6 1.Institute of Geographic {1. and Natural Resources Research,{1., beijing 1.01.1. china 2 Institute of Tibetan Plateau Research,{1., beijing 1.0085, china 3 Institute of Desert and Meteorology, china Meteorological Administration, Urumqi 830002, china 4 Graduate University of{1., beijing 1.0049, china 5 Institute of Vertebrate Paleontology and Paleoanthropology,{1., beijing 1.0044, china 6 School of Life and Geography {1., Qinghai Normal University, Xining 81.008, china 1. Institute of Geographic sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China4. Graduate University of Chinese Academy of Sciences Beijing 100049 China2. Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China3. Institute of Desert and Meteorology China Meteorological Administration Urumqi 830002 China5. Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing 100044 China6. School of Life and Geography Sciences Qinghai Normal University Xining 810008 China

As one of the earliest species used in dendrochronological studies, Larix responds sensitively to climate change. In this study, nine larch species and one variety from eleven sites were collected to study the growth characteristics of tree-ring width using dendrochronological methods. Ten residual tree-ring chronologies were developed to analyze their relationships with regional standardized anomaly series by Pearson’s correlation analysis. The results suggest that most of the chronologies had significantly positive correlations with the mean temperature and mean maximum temperature in May. The spring temperature evidently limited the radial growth of the larch species without precipitation control. The largest mean tree-ring width was found in Himalayan Larch in Jilong, whereas Master Larch in Si’er reflected the smallest mean value. Both species presented little climate information in this study. chinese, Potanin, and Tibetan larches are significantly correlated with climate change, implying a huge potential for climate history reconstruction. The elevation of the sampling sites appears to be an important condition for tree-ring growth of larches responding to climate factors.

关键词： Larix Miller tree-ring climate change mean temperature in May

SYNTHESIS OF NOVEL SOLUBLE AROMATIC POLYPYROMELLITIMIDE CONTAINING ORDERED 1.2,4-TRIAZINE IN THE MAIN CHAIN

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chinese Journal of Polymer Science 2002年第3期20卷 219-224页

作者： Xiao-bing Yi Guo-shi Wu Feng-cai Lu Department of Chemistry Tsinghua University, {1. 1.0084{1. Institute of Chemistry chinese academy of sciences, beijing 100080,{1. Tsing Hua Univ Dept Chem Beijing 100084 Peoples R China chinese Acad Sci Inst Chem Beijing 100080 Peoples R China

A new heat-resistant, soluble polymer, poly(phenyl-1.2,4-triazine imide), has been prepared via a two-step method of polycondensation of N,N'-bis(4-benzil)pyromellitimide and terephthalamidrazone in cresol, followed by curing at higher temperature. The rigid 1.2,4-triazine group increases the solubility of the polyimide so that the polymer is soluble in cresol, N-methyl-2-pyrrolidone (NMP), trifluoroacetic acid and concentrated sulfuric acid, etc. Thermogravimetric analysis (TGA) indicates that this novel polyimide has good thermal stability with a high decomposition temperature of 447degreesC in air and of 423 degreesC in N-2, It has a tensile strength of 1.7.4 MI'a with an elongation at break of around 7.6%.

关键词： polyimides N,N '-bis(4-benzil)pyromellitimide rigid-rod group 1.2,4-triazine

Vertical quantitative and dominant population distribution of the bacteria isolated from the Muztagata ice core

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Science china Earth {1. 2005年第10期48卷 1728-1739页

作者： XIANG Shurong1. YAO Tandong1. 2, AN Lizhe1. 3, WU Guangjian2, XU Baiqing2, MA Xiaojun 3, LI Zhen1. WANG Junxia1.& yu Wusheng1.1. Key Laboratory of Ice Core and Cold Regions Environment, Cold and Arid Regions Environmental and Engineering Research Institute,{1., Lanzhou 730000,{1. 2. Institute of Tibetan Plateau Research,{1., beijing 1.0085,{1. 3. College of Life Science, Lanzhou University, Lanzhou 730000,{1. Key Laboratory of Ice Core and Cold Regions Environment Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou China Institute of Tibetan Plateau Research chinese academy of sciences {1. china College of Life Science Lanzhou University Lanzhou china

Vertical distribution of the main bacteria isolated from the Muztagata ice core (about 22.4 m) was investigated by means of cultivation and 1.S rRNA sequence analysis. The results showed that the amount of culturable bacteria fluctuated with ice core depth, and was more in dirty layer than in clean ice, which suggested the close corresponding relationship between high input of the bacteria deposited by wind and snowflow and dirty layer. Most of the bacteria were psychrophiles and psychrotolerants, including α- and γ-proteobacteria, Cryobacterium psychro-philum, CFB (Cytophaga-Flavobacterium-Bacteroides) group, high-G+C gram-positive bacteria (HGC). Acinetobacter sp. and HGC repeatly occurred in different ice depths, and their quantita-tive distribution was consistent with the change of the total amount of culturable bacteria with depth, which suggested the main bio-indicator; while Flavobacterium, Cryobacterium psychro-philum, and α-proteobacteria, also functioned as a secondary indicator of climatic and environ-mental changes. This study is the first report concerning continuous quantitative variation and pattern of the main culturable bacteria in ice core section.

关键词： Pamirs Plateau, ice core, pattern of bacteria, bio-indicator.

Observation of signature inversion in the πh_(9/2)(×)νi_(1./2) oblate band

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Science china(Physics,Mechanics & Astronomy) 2005年第4期48卷 442-449页

作者： XIE Chengying1.2, ZHOU Xiaohong1.2, ZHANG yuhu1. GUO Yingxiang1. LEI Xiangguo1. ZHENG Yong1. LIU Minliang1. SONG Litao1. WANG Hualei1. yu Haiping1. GUO Wentao 1. LUO Peng1. WU Zhijun1. ZHU Lihua3 & WU Xiaoguang3 ⒈ Institute of Modern Physics, chinese academy of sciences, Lanzhou 730000,{1. ⒉ Graduate School of the chinese academy of sciences, beijing 1.0049,{1. ⒊ Institute of Atomic Energy Research, beijing 1.241.,{1. Institute of Modern Physics Chinese Academy of Sciences Lanzhou China Graduate School of the chinese academy of sciences Beijing China Institute of Atomic Energy Research Beijing China

High-spin states in 1.0Tl have been studied via the 1.0Gd(35Cl, 5nγ) reaction. The level scheme, consisting of the π h9 /2 νi1./2 oblate band and a cascade with character of single particle excitations, has been established. Spin values have been firmly assigned to the oblate band in 1.0Tl, resulting in low-spin signature inversion in the π h9 /2 νi1./2 oblate band for the first time. Based on the similarity of the level structure in doubly odd Tl nuclei, spin values for the oblate bands in 1.2―200Tl should be re-assigned, and a consistent low-spin signature inversion has occurred in these oblate deformed nuclei. The low-spin signature inversion phenomena can be interpreted qualitatively by using the 2-quasiparticle plus rotor model including p-n residual interactions.

关键词： deformed odd-odd 1.0Tl, oblate rotational bands, signature inversion, 2-qp+rotor model.

Application of the moist vorticity vector in the analysis of a heavy rainfall event in North china

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Progress in Natural Science:Materials International 2007年第12期17卷 1457-1465页

作者： Zhao yu1.2,3, Wang Jianguo4 and Xue Deqiang2(1. Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics,{1., {1. 1.0029, china 2. Shandong Provincial Meteorological Observatory, Jinan 250031. china 3. Graduate University of{1., {1. 1.0039, china 4. Shandong Provincial Meteorological Bureau, Jinan 250031. china) Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Shandong Provincial Meteorological Observatory Jinan 250031 China Graduate University of chinese academy of sciences Beijing 100039 China Shandong Provincial Meteorological Bureau Jinan 250031 China

The moist vorticity vector (MVV), defined as (ζa×▽qv)/ρ introduced by Gao et al. is used to study a heavy rainfall event in North china. The MVV has zonal, meridional and vertical components in a three-dimensional framework. Analysis of domain-mean and mass-integrated quantities shows that the variation of the vertical component of the MVV closely follows the variation of the cloud hydrometeors, with a linear correlation coefficient of 0.95, indicating that the vertical component of the MVV is strongly associated with midlatitude convection. Further analysis shows that the vertical component of the MVV reflects the interaction between the horizontal vorticity and the horizontal specific humidity gradient, which can associate dynamic and thermodynamic processes with cloud microphysical processes. Thus, this study can help to understand how the interaction between circulations and clouds aids the development of convection, and the MVV can be used to trace the development and evolution of heavy rainfall.

关键词： moist vorticity vector heavy rainfall modeling study.