维普中文期刊产品整合服务
71篇 您的检索式:作者名="Junming XU"
    题名 作者 年代 出处 被引量
1An investigation of surface deformation after fully mechanized,solid back fill mining显示文摘The surface deformation after fully mechanized back filling mining was analyzed.The surface deformation for different backfill materials was predicted by an equivalent mining height model and numerical simulations.The results suggest that:(1) As the elastic modulus,E,of the backfill material increases the surface subsidence decreases.The rate of subsidence decrease drops after E is larger than 5 GPa;(2) Fully mechanized back fill mining technology can effectively control surface deformation.The resulting surface deformation is within the specification grade I,which means surface maintenance is not needed.A site survey showed that the equivalent mining height model is capable of predicting and analyzing surface deformation and that the model is conservative enough for engineering safety.Finally,the significance of establishing a complete error correction system based on error analysis and correction is discussed.Li Jian Zhang Jixiong Huang Yanli Zhang Qiang Xu Junming 2012International Journal of Mining Science and Technology2012,22,4:23
2Wheat genomic study for genetic improvement of traits in China显示文摘Bread wheat(Triticum aestivum L.)is a major crop that feeds 40%of the world’s population.Over the past several decades,advances in genomics have led to tremendous achievements in understanding the origin and domestication of wheat,and the genetic basis of agronomically important traits,which promote the breeding of elite varieties.In this review,we focus on progress that has been made in genomic research and genetic improvement of traits such as grain yield,end-use traits,flowering regulation,nutrient use efficiency,and biotic and abiotic stress responses,and various breeding strategies that contributed mainly by Chinese scientists.Functional genomic research in wheat is entering a new era with the availability of multiple reference wheat genome assemblies and the development of cutting-edge technologies such as precise genome editing tools,highthroughput phenotyping platforms,sequencing-based cloning strategies,high-efficiency genetic transformation systems,and speed-breeding facilities.These insights will further extend our understanding of the molecular mechanisms and regulatory networks underlying agronomic traits and facilitate the breeding process,ultimately contributing to more sustainable agriculture in China and throughout the world.Jun Xiao Bao Liu Yingyin Yao Zifeng Guo Haiyan Jia Lingrang Kong Aimin Zhang Wujun Ma Zhongfu Ni Shengbao Xu Fei Lu Yuannian Jiao Wuyun Yang Xuelei Lin Silong Sun Zefu Lu Lifeng Gao Guangyao Zhao Shuanghe Cao Qian Chen Kunpu Zhang Mengcheng Wang Meng Wang Zhaorong Hu Weilong Guo Guoqiang Li Xin Ma Junming Li Fangpu Han Xiangdong Fu Zhengqiang Ma Daowen Wang Xueyong Zhang Hong-Qing Ling Guangmin Xia Yiping Tong Zhiyong Liu Zhonghu He Jizeng Jia Kang Chong 2022Science China(Life Sciences)2022,65,9:9
3Photonic integrated technology for multi-wavelength laser emission显示文摘We summarized the design, fabrication challenges and important technologies for multi-wavelength laser transmitting photonic integration. Technologies discussed include multi-wavelength laser arrays, monolithic integration and modularizing coupling and packaging. Fabrication technique requirements have significantly declined with the rise of reconstruction-equivalent-chirp and second nanoimprint mask technologies. The monolithic integration problem between active and passive waveguides can be overcome with Butt-joint and InP array waveguide grating technologies. The dynamic characteristics of multi-factors will be simultaneously measured with multi-port analyzing modules. The performance of photonic integration chips is significantly improved with the autoecious factors compensation packaging technique.CHEN XiangFei LIU Wen AN JunMing LIU Yu XU Kun WANG Xin LIU JianGuo JI YueFeng ZHU NingHua 2011Chinese Science Bulletin2011,56,28:9
4Effects of Anodic Voltages on Microstructure and Properties of Plasma Electrolytic Oxidation Coatings on Biomedical NiTi Alloy显示文摘Plasma electrolytic oxidation (PEO) coatings, formed under various anodic voltages (320-440 V) on biomedical NiTi alloy, are mainly composed of γ-Al2O3 crystal phase. The evolution of discharging sparks during the PEO process under different anodic voltages was observed. The surface and cross-sectional morphologies, composition, bonding strength, wear resistance and corrosion resistance of the coatings were investigated by scanning electron microscopy (SEM), thin-film X-ray diffraction (TF-XRD), energy dispersive X-ray spectrometry (EDS), surface roughness, direct pull-off test, ball-on-disk friction and wear test and potentiodynamic polarization test, respectively. The results showed that the evolution of discharging sparks during the PEO process directly influenced the microstructure of the PEO coatings and further influences the properties. When the anodic voltage increased from 320 V to 400 V, the corrosion resistance and wear resistance of the coatings slowly increased, and all the bonding strength was higher than 60 MPa; further increasing the anodic voltages, especially up to 440 V, although the thickness and γ-Al2O3 crystallinity of the coatings further increased, the microstructure and properties of the coatings were obviously deteriorated.Jilin Xu Fu Liu Junming Luo Liancheng Zhao 2013Journal of Materials Science & Technology2013,29,1:5
5Light-absorbing impurities on Keqikaer Glacier in western Tien Shan: concentrations and potential impact on albedo reduction显示文摘Light-absorbing impurities on glaciers are important factors that influence glacial surface albedo and accelerate glacier melt. In this study, the quantity of light-absorbing impurities on Keqikaer Glacier in western Tien Shan, Central Asia, was measured. We found that the average concentrations of black carbon was 2,180 ng/g, with a range from 250 ng/g to more than 10,000 ng/g. The average concentrations of organic carbon and mineral dust were 1,738 ng/g and 194 μg/g, respectively. Based on simulations performed with the Snow Ice Aerosol Radiative model simulations, black carbon and dust are responsible for approximately 64% and 9%, respectively, of the albedo reduction, and are associated with instantaneous radiative forcing of 323.18 W/m2(ranging from 142.16 to 619.25 W/m2) and 24.05 W/m2(ranging from 0.15 to69.77 W/m2), respectively. For different scenarios, the albedo and radiative forcing effect of black carbon is considerably greater than that of dust. The estimated radiative forcing at Keqikaer Glacier is higher than most similar values estimated by previous studies on the Tibetan Plateau, perhaps as a result of black carbon enrichment by melt scavenging. Light-absorbing impurities deposited on Keqikaer Glacier appear to mainly originate from central Asia, Siberia, western China(including the Taklimakan Desert) and parts of South Asia in summer, and from the Middle East and Central Asia in winter.A footprint analysis indicates that a large fraction(>60%) of the black carbon contributions on Keqikaer Glacier comes from anthropogenic sources. These results provide a scientific basis for regional mitigation efforts to reduce black carbon.YuLan Zhang ShiChang Kang Min Xu Michael Sprenger TanGuang Gao ZhiYuan Cong ChaoLiu Li JunMing Guo ZhiQiang Xu Yang Li Gang Li XiaoFei Li YaJun Liu HaiDong Han 2017Research in Cold and Arid Regions2017,9,2:4
6The Tibetan Plateau Surface–Atmosphere Coupling System and Its Weather and Climate Effects: The Third Tibetan Plateau Atmospheric Science Experiment显示文摘The Tibetan Plateau(TP) is a key area affecting forecasts of weather and climate in China and occurrences of extreme weather and climate events over the world. The China Meteorological Administration, the National Natural Science Foundation of China, and the Chinese Academy of Sciences jointly initiated the Third Tibetan Plateau Atmospheric Science Experiment(TIPEX-Ⅲ) in 2013, with an 8–10-yr implementation plan. Since its preliminary field measurements conducted in 2013, routine automatic sounding systems have been deployed at Shiquanhe, Gaize, and Shenzha stations in western TP, where no routine sounding observations were available previously. The observational networks for soil temperature and soil moisture in the central and western TP have also been established. Meanwhile, the plateau-scale and regional-scale boundary layer observations, cloud–precipitation microphysical observations with multiple radars and aircraft campaigns, and tropospheric–stratospheric air composition observations at multiple sites, were performed. The results so far show that the turbulent heat exchange coefficient and sensible heat flux are remarkably lower than the earlier estimations at grassland, meadow, and bare soil surfaces of the central and western TP. Climatologically, cumulus clouds over the main body of the TP might develop locally instead of originating from the cumulus clouds that propagate northward from South Asia. The TIPEX-Ⅲ observations up to now also reveal diurnal variations, macro-and microphysical characteristics, and water-phase transition mechanisms, of cumulus clouds at Naqu station. Moreover, TIPEX-Ⅲ related studies have proposed a maintenance mechanism responsible for the Asian 'atmospheric water tower' and demonstrated the effects of the TP heating anomalies on African, Asian, and North American climates. Additionally, numerical modeling studies show that the Γ distribution of raindrop size is more suitable for depicting the TP raindrop characteristics compared to the M–P distribution, the overestimation of sensible heat flux can be reduced via modifying the heat transfer parameterization over the TP, and considering climatic signals in some key areas of the TP can improve the skill for rainfall forecast in the central and eastern parts of China. Furthermore, the TIPEX-Ⅲ has been promoting the technology in processing surface observations, soundings, and radar observations, improving the quality of satellite retrieved soil moisture and atmospheric water vapor content products as well as high-resolution gauge–radar–satellite merged rainfall products, and facilitating the meteorological monitoring, forecasting, and data sharing operations.Ping ZHAO Yueqing LI Xueliang GUO Xiangde XU Yimin LIU Shihao TANG Wenming XIAO Chunxiang SHI Yaoming MA Xing YU Huizhi LIU La JIA Yun CHEN Yanju LIU Jian LI Dabiao LUO Yunchang CAO Xiangdong ZHENG Junming CHEN An XIAO Fang YUAN Donghui CHEN Yang PANG Zhiqun HU Shengjun ZHANG Lixin DONG Juyang HU Shuai HAN Xiuji ZHOU 2019Journal of Meteorological Research2019,33,3:4
7Increased mercury pollution revealed by tree rings from the China's Tianshan Mountains显示文摘Mercury (Hg)can be transported globally by the atmospheric circulation and it accumulates and biomagnifies along food chains [1,2].Due to its threats to human health and wildlife when converted to the neurotoxin methyl mercury,variations in Hg concentration in various ecosystems were paid more attention by scientists recently.Natural processes such as geothermal activities, volcanic activities,and weathering of Hg-containing rocks,can release a mass of Hg to the environment.Anthropogenic emissions had become the main atmospheric pollution source since the Industrial Revolution.A recent study indicated that half of the Hg presented in atmosphere was sourced from human activities and about 73%total mercury was released after 1850[3].Aiming to reduce the impact of Hg to environmental and human health,UNEP (United Nations Environment Programme)passed the Minamata Convention in 2013to limit Hg emission through contro|ling technologies on air pollution.Huhu Kang Xiaohong Liu Junming Guo Guobao Xu Guoju Wu Xiaomin Zeng Bo Wang Shichang Kang 2018Science Bulletin2018,63,20:4
8SOME RESULTSON R_2-EDGE-CONNECTIVITY OF EVEN REGULAR GRAPHS显示文摘Let Gbe a connected k(≥3)-regulargraph w ith girth g. A setSofthe edgesin G is called an R2-edge-cutifG- Sis disconnected and contains neither an isolated vertex nor a one- degree vertex. The R2-edge-connectivity of G, denoted by λ″(G), is the m inim um cardinality over allR2-edge-cuts, w hich is an im portantm easure for fault-tolerance of com puter intercon- nection netw orks. In this paper, λ″(G)= g(2k- 2) for any 2k-regular connected graph G(≠ K5) that is either edge-transitive or vertex-transitive and g≥5 is given.Xu Junming Dept. of Math., Univ. ofScience and Technology ofChina, Hefei230026.Em ail:XUJM@ USTC.EDU.CN 1999Applied Mathematics(A Journal of Chinese Universities)1999,14,3:3
9Characterization of different-Al-content AlGaN/GaN heterostructures on sapphire显示文摘Al x Ga 1-x N/GaN high-electron-mobility transistor (HEMT) structures with Al composition ranging from x = 0.13 to 0.36 are grown on sapphire substrates by low-pressure metalorganic chemical vapor deposition (LP-MOCVD). The effects of Al content on crystal quality, surface morphology, optical and electrical characteristics of the AlGaN/GaN heterostructures have been analyzed. Although high Al-content (36%) heterostructure exhibits a distinguished photoluminescence peak related to recombination between the two-dimensional electron gas and photoexcited holes (2DEG-h), its crystal quality and rough surface morphology are poor. 2DEG mobility increases with the Al content up to 26% and then it apparently decreases for high Al-content (36%) AlGaN/GaN heterostructure. The increase of sheet carrier density with the increase of Al content has been observed. A high mobility at room temperature of 2105 cm 2 /V s with a sheet carrier density of n s = 1.10 × 10 13 cm -2 , for a 26% Al-content AlGaN/GaN heterostructure has been obtained, which is approaching state-of-the-art for HEMT grown on SiC. Sheet resistance as low as 274 Ω/□ has also been achieved.DING GuoJian , GUO LiWei, XING ZhiGang, CHEN Yao, XU PeiQiang, JIA HaiQiang, ZHOU JunMing & CHEN Hong Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 2010Science China(Physics,Mechanics & Astronomy)2010,53,1:3
10Preparation and in vitro Release Performance of Sustained-release Captopril/Chitosan-gelatin Net-polymer Microspheres显示文摘The captopril/Chitosan-gelatin net-polymer microspheres(CTP/CGNPMs) were prepared using Chitosan(CTS) and gelatin(GT) by the methods of emulsification,cross-linked reagent alone or in combination and microcrystalline cellulose(MCC) added in the process of preparation of microspheres,which aimed to eliminate dose dumping and burst phenomenon of microspheres for the improvement of the therapeutic efficiency and the decrease of the side effects of captopril(CTP). The results indicated that CTP/CGNPMs had a spherical shape,smooth surface and integral structure inside but no adhesive phenomena in the preparation. The size distribution ranged from 220 μm to 280 μm. The CTP release test in vitro demonstrated that CTP/CGNPMs played the role of retarding the release of CTP compared with ordinary CTP tablets. The release behaviors of CGNPMS were influenced by preparation conditions such as experimental material ratio(EMR) and composition of cross linking reagents. Among these factors,the EMR(1/4),CLR(FA+SPP) and 0.75% microcrystalline cellulose(MCC) added to the microspheres constituted the optimal scheme for the preparation of CTP/CGNPMs. The ER,DL and SR of CTP/CGNPMs prepared according to the optimal scheme were 46.23±4.51%,9.95±0.77% and 261±42%,respectively. The CTP/CGNPMs had the good characteristics of sustained release of drug and the process of emulsification and cross-linking were simple and stable. The CGNPMs are likely to be an ideal sustained release formulation for water-soluble drugs.ZHOU Li XU Junming SONG Yimin GAO Yuanyuan CHEN Xiguang 2007Journal of Ocean University of China2007,6,3:2
11CONNECTIVITY OF CARTESIAN PRODUCT DIGRAPHS AND FAULT-TOLERANT ROUTINGS OF GENERALIZED HYPERCUBE显示文摘CONNECTIVITYOFCARTESIANPRODUCTDIGRAPHSANDFAULT┐TOLERANTROUTINGSOFGENERALIZEDHYPERCUBEXUJUNMINGAbstract.Inthispaper,theproblem...XU JUNMING 1998Applied Mathematics(A Journal of Chinese Universities)1998,13,2:2
12Novel SFTSV Phylogeny Reveals New Reassortment Events and Migration Routes显示文摘Severe fever with thrombocytopenia syndrome virus(SFTSV),the causative agent of a febrile human disease,was first identified from central and eastern provinces in China,and later in Japan and South Korea.Hubei Province is one of the major SFTS epidemic areas in the central part of China.This study reported the isolation of 11 new SFTSV strains from patients in Hubei Province collected in 2017.Extensive phylogenetic analyses were conducted based on the complete coding sequences of SFTSV segments including the new strains.It was suggested that five different SFTSV genotypes were circulating in Hubei,and 15 reassortment patterns and migration pathways correlated with each genotype were identified,which was more than previously recognized.Hubei Province was more involved in the evolutionary events of SFTSV than that previously thought in which the evolutionary events of SFTSV were reported to be independent from those in other epidemic regions.Further divergence of SFTSV strains was suggested by pairwise comparison of SFTSV sequences from each genotype and sequence identity normalized to representative strain in genotype C1.Subsequently,amino acid variations specific for genotype(s),strain(s),or cluster(s)were inspected,which may be related to differential biological activity of SFTSV strains/genotypes.In conclusion,we analyzed the current status of SFTSV phylogeny in Hubei Province and discussed the possible events correlated to SFTSV evolution.It provided an in-depth insight into SFTSV evolution,raising concerns for the use of proper SFTSV strains in future studies.Xiaoli Wu Mingyue Li Yanfang Zhang Boyun Liang Junming Shi Yaohui Fang Zhengyuan Su Mengmeng Li Wenjing Zhang Ling Xu Jun Wang Qiaoli Wu Shuang Tang Hualin Wang Tao Zhang Cheng Peng Xin Zheng Fei Deng Shu Shen 2021Virologica Sinica2021,36,2:2
13lncRNA-AC130710 targeting by miR-129-5p is upregulated in gastric cancer and associates with poor prognosis显示文摘Chunjing Xu Yongfu Shao Tian Xia Yunben Yang Jiawei Dai Lin Luo Xinjun Zhang Weiliang Sun Haojun Song Bingxiu Xiao Junming Guo 2014Tumor Biology2014,,10:1
14Bio-oil upgrading by means of ozone oxidation and esterification to remove water and to improve fuel characteristics 显示文摘Xu Junming Jiang Jianchun Dai Weidi 2011Energy Fuels2011,,25:1
15Liquid hydrocarbon fuels obtained by the cracking of soybean oils 显示文摘Xu Junming Jiang Jianchun Lu Yanju 2009Bioresource Technology2009,100,20:1
16The development of Bi Fe O_3-based ceramics显示文摘The multiferroic properties of Bi Fe O3-based ceramics were improved through optimizing their sintering method and doping with certain rare earth elements in pure Bi Fe O3. Some methods, especially liquid-phase sintering method has largely decreased the densities of oxygen vacancies and Fe2in Bi Fe O3-based ceramics, and thus their resistivity became high enough to measure the saturated polarization and the large piezoelectric d33 coefficient under the high electric field of [150 k V/cm. Besides,multiferroic properties were improved through the rare earth elements' doping in pure Bi Fe O3. Magnetization commonly increases with the proportional increase of Nd,La, Sm and Dy contents up to *30 %, while ferroelectric phase can transform to paraelectric phase at a certain proportion. An improved magnetoelectric coupling was often observed at ferroelectric phase with a relatively large proportion. Besides, an enhanced piezoelectric coefficient is expected in Bi Fe O3-based ceramics with morphotropic phase boundaries as they are already observed in thin epitaxial Bi Fe O3 films.Ahmad Hussain Xijun Xu Guoliang Yuan Yiping Wang Ying Yang Jiang Yin Junming Liu Zhiguo Liu 2014Chinese Science Bulletin2014,59,36:1
17Review of the direct thermochemical conversion of lignocellulosic biomass for liquid fuels显示文摘Increased demand for liquid transportation fuels, environmental concerns and depletion of petroleum resources requires the development of efficient conversion technologies for production of second-generation biofuels from non-food resources. Thermochemical approaches hold great potential for conversion of lignocellulosic biomass into liquid fuels. Direct thermochemical processes convert biomass into liquid fuels in one step using heat and catalysts and have many advantages over indirect and biological processes, such as greater feedstock flexibility, integrated conversion of whole biomass, and lower operation costs. Several direct thermochemical processes are employed in the production of liquid biofuels depending on the nature of the feedstock properties: such as fast pyrolysis/liquefaction of lignocellulosic biomass for bio-oil, including upgrading methods, such as catalytic cracking and hydrogenation. Owing to the substantial amount of liquid fuels consumed by vehicular transport, converting biomass into drop-in liquid fuels may reduce the dependence of the fuel market on petroleumbased fuel products. In this review, we also summarize recent progress in technologies for large-scale equipment for direct thermochemical conversion. We focus on the technical aspects critical to commercialization of the technologies for production of liquid fuels from biomass,including feedstock type, cracking catalysts, catalytic cracking mechanisms, catalytic reactors, and biofuel properties. We also discuss future prospects for direct thermochemical conversion in biorefineries for the production of high grade biofuels.Jianchun JIANG Junming XU Zhanqian SONG 2015Frontiers of Agricultural Science and Engineering2015,2,1:1
18Synthesis oftributyl citrate using acid ionic liquid as catalyst显示文摘Xu Junming Jiang J Chun Zuo Z Y 2010ProcessSafety and Environmental Protection2010,,88:1
19Comparison of high‐protein soybean meal and commercial soybean meal partly replacing fish meal on the activities of digestive enzymes and aminotransferases in juvenile Japanese seabass, Lateolabrax japonicus (Cuvier, 1828)显示文摘Yan Li Qinghui Ai Kangsen Mai Wei Xu Junming Deng Zhenyan Cheng 2014Aquac Res2014,,6:1
20Effects of replacing fish meal with soy protein concentrate on feed intake and growth of juvenile Japanese flounder, Paralichthys olivaceus显示文摘Junming Deng Kangsen Mai Qinghui Ai Wenbing Zhang Xiaojie Wang Wei Xu Zhiguo Liufu 2006Aquaculture2006,,1:1
返回顶部 每页显示:
共4页 首页 上一页 第1页 下一页 末页 /4 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费