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239篇 您的检索式:作者名="Fengxiang"
    题名 作者 年代 出处 被引量
1THE 2-ERROR LINEAR COMPLEXITY OF 2~n-PERIODIC BINARY SEQUENCES WITH LINEAR COMPLEXITY 2~n-1显示文摘Linear complexity and k-error linear complexity of the stream cipher are two important standards to scale the randomicity of keystreams. For the 2n -periodicperiodic binary sequence with linear complexity 2n 1and k = 2,3,the number of sequences with given k-error linear complexity and the expected k-error linear complexity are provided. Moreover,the proportion of the sequences whose k-error linear complexity is bigger than the expected value is analyzed.Zhu Fengxiang Qi Wenfeng 2007Journal of Electronics(China)2007,24,3:21
2美国农业面源污染控制生态补偿机制与政策措施显示文摘简要概述农业面源污染控制的环境经济相关理论,回顾了美国农业面源污染治理的历程及'最佳管理实践措施',并分别从财政补偿、政策补偿、技术补偿、项目补偿四个方面分析研究美国生态补偿机制与政策措施的经验,从而提出对中国农业面源污染控制的启示。重视激励促进作用,运用多种有效手段,构建监督执行机制,完善技术保障体系等对中国农业面源污染控制生态补偿机制与政策措施的建立和实施具有重要的现实意义。汪洁 马友华 栾敬东 王桂苓 李冬 Fengxiang HAN 2011农业环境与发展2011,28,4:18
3Trace-element of Tuoyun cli-nopyroxene:Implication for the deep processes of litho-spheric mantle beneath the southwest Tianshan,West China显示文摘Based on the LAM-ICPMS analytic results on the trace elements of clinopyroxenes in peridotitic xenoliths occurring in early-Cretaceous basalts from western Xinjiang, the properties and the deep processes, including partial melting and mantle metasomatism, of the subcontinental lithospheric mantle beneath the Tuoyun Basin are analyzed. In the northern edge of the Tarim Basin (southwest Tian-shan), the Mesozoic subcontinental lithosphere which has experienced the effect of partial melting (<10%) and intricate mantle metasomatism is characterized by Phanerozoic ’ocean-type’ mantle. The superposed influence of SiO2-un-saturated silicate melt and carbonate melt probably results in the metasomatic medium which resembles the hydrous silicated carbonate melt in some aspects. By comparing Tuoyun mantle with Cenozoic main mantle beneath eastern China, the properties are similar, while the former shows finer grain and higher diopside content of the peridotites and more conspicuous modal metasomatism.ZHENG Jianping LU Fengxiang S.Y.O’Reilly LUO Zhaohua 2001Chinese Science Bulletin2001,46,14:13
4Combined treatment with erythropoietin and granulocyte colony-stimulating factor enhances neovascularization and improves cardiac function after myocardial infarction显示文摘Xue Jingyi Du Guoqing Shi Jing Li Yue Masahiro Yasutake Liu Lei Li Jianqiang Kong Yihui Wang Shuxian Yun Fengxiang Li Weimin 2014Chinese Medical Journal2014,,9:12
5PARAMETRIC EQUATIONS OF NONHOLONOMIC NONCONSERVATIVE SYSTEMS IN THE EVENT SPACE AND THE METHOD OF THEIR INTEGRATION显示文摘In this paper,the parametric equations with multipliers of nonholonomic nonconservative sys-tems in the event space are established,their properties are studied,and their explicit formulation is obtained.And then the field method for integrating these equations is given.Finally,an example illustrating the appli-cation of the integration method is given.Mei Fengxiang (Beijing Institute of Technology) 1990Acta Mechanica Sinica1990,6,2:10
6Synthesis,characterization and catalytic properties of Y-β zeolite composites显示文摘Y-β zeolite composites were hydrothermally synthesized by using high silica Y zeolite as the precursor and characterized by XRD,N2 adsorption,SEM and IR spectra of pyridine.The result showed that the N2 adsorption-desorption isotherm of the zeolite composites had a distinct hysteresis loop,and the SEM result showed that the zeolite composites had a different morphology from Y,β and the corresponding physical zeolite mixture.The acid catalytic performance of the zeolite composite catalysts was investigated in the hydrocracking and hydroisomerization of n-octane,and the results showed that the composite materials exhibited an excellent hydrocracking activity and good hydroisomerization performance.The yield of i-C4 over the zeolite composite catalyst was 4.45% higher than that on the corresponding zeolite mixture in the n-octane hydrocracking process at 553 K.The isomerization ability of n-octane over the composite catalyst was 3.6 fold that of the corresponding mixture at 503 K.Qin Bo Zhang Xiwen Zhang Zhizhi Ling Fengxiang Sun Wanfu 2011Petroleum Science2011,8,2:9
7Experimental Study on Characteristics of NiMnGa Magnetically Controlled Shape Memory Alloy显示文摘静电干扰和 NiMnGamagnetically 控制的形状记忆合金(MSMA ) 的动态磁性的控制特征试验性地被学习。关于磁场的导致的紧张的特征与浸透自然是非线性的结果表演,和温度以及负担上的依赖者适用于 MSMA。Themagnetic 形状记忆效果能在房间温度仅仅在完全的马氏体阶段被观察。MSMA 的磁性的渗透不与磁场的增长是常数和还原剂。相对浸透 MSMA 的磁性的渗透是大约 1.5。Fengxiang WANG Wenjun LI Qingxin ZHANG Chenxi LI Xinjie WU 2006Journal of Materials Science & Technology2006,22,1:8
8A conformal invariance for generalized Birkhoff equations显示文摘在这篇文章,概括了 Birkhoff 方程被把增补术语加到 Birkhoff 方程提出。Birkhoff 方程的保角的不变性能被用来学习概括 Birkhoff 方程,并且二个例子被举说明结果的申请。Fengxiang Mei Jiafang Xie Tieqiang Gang 2008Acta Mechanica Sinica2008,24,5:8
9Formation and evolution mechanisms of large-clusters during rapid solidification process of liquid metal Al显示文摘A molecular dynamics simulation study has been performed for the formation and evolution characteristics of nano-clusters in a large-scale system consisting of 400000 atoms of liquid metal Al. The center-atom method combined with pair-bond analysis technique and cluster-type index method (CTIM) has been applied here to describe the structural configurations of various basic clusters. It is demonstrated that both the 1551 bond-type and the icosahedral cluster (12 0 12 0) constructed by 1551 bond-types are dominant among all the bond-types and cluster-types, respectively, in the system and play a critical role in the microstructure transitions of liquid metal Al. The nano-clusters (containing up to 150 atoms) are formed by the combination of some middle and small clusters with distinctly different sizes, through mutual competition by unceasing annex and evolution in a seesaw manner (in turn of obtaining and losing),which do not occur as the multi-shell structures accumulated with an atom as the center and the surrounding atoms are arranged according to a certain rule. This is the essential distinction of nano-cluster in liquid metal from those obtained by gaseous deposition, ionic spray methods, and so on. Though the nano-clusters differ from each other in shape and size, all of them possess protruding corners that could become the starting points of various dendrite structures in the solidification processes of liquid metals.LIU Rangsu, DONG Kejun, LIU Fengxiang, ZHENG Caixing, LIU Hairong & LI Jiyong Department of Applied Physics, Hunan University, Changsha 410082, China College of Materials Science and Engineering, Hunan University, Changsha 410082, China College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China 2005Science China(Physics,Mechanics & Astronomy)2005,48,1:7
10Garnet-bearing Granulite Facies Rock Xenoliths from Late Mesozoic Volcaniclastic Breccia, Xinyang, Henan Province显示文摘This paper presents the primary results of petrologic,mineralogical and petrochemical studies of garnet beating granulite facies rock xenoliths from Xinyang, Henan Province. These xenoliths, which are found in a pipe of late Mesozoic volcaniclastic breccia, are of high density (3.13-3.30 g/cm3) and high seismic velocity (Vp = 7.04-7.31 km/s), being products of underplating of basaltic magmas and had experienced granulite facies metamorphism. The underplating and metamorphism took place before the eruption of the host rock. Petrographical studies and equilibrium T-P calculations show that these xenoliths were captured at a 49 km depth and experienced at least a 16 km uplift before they were captured. The dynamics of the uplift could be related to the continent-continent collision between the North China plate and the Yangtze plate during the Triassic.ZHENG Jianping, SUN Min, LU Fengxiang, WANG Chunyangand ZHONG Zengqiu Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China Department of Earth Sciences, The University of Hong Kong, China 2001Acta Geologica Sinica(English Edition)2001,75,4:7
11A potential red-emitting phosphors scheelite-like triple molybdates LiKGd_2(MoO_4)_4:Eu^(3+) for white light emitting diode applications显示文摘A series of novel red-emitting phosphors scheelite-like triple molybdates LiKGd2-xEux(MoO4)4(0.1 ≤ x ≤ 1.9) were synthesized by solid state reaction method and their photoluminescence properties were investigated. The photoluminescence results show that all samples can be excited efficiently by UV (396 nm) light and blue (466 nm) light and emit red (615 nm) light with line spectra,which are coupled well with the characteristic emission from UV-LED and blue LED,respectively. The experimental results and their analysis suggest that the energy transfer occurs due to dipole-dipole interactions among Eu3+ ions in LiKGd2-xEux(MoO4)4. Compared with Ca0.8MoO4: Eu 30+.2,the emission intensity of LiKGd0.9(MoO4)4: Eu 13.+1 is about 1.4 times higher and the CIE chromaticity coordinates are as close to the National Television System Committee (NTSC) standard values as those of Ca0.8MoO4: Eu 30+.2. The optical properties suggest that LiKGd0.9(MoO4)4: Eu 13.+1 is an efficient red-emitting phosphor for white LEDs applications.XIE An YUAN XiMing WANG FengXiang 2011Science China(Technological Sciences)2011,54,1:7
12A FIELD METHOD FOR SOLVING THE EQUATIONS OF MOTION OF NONHOLONOMIC SYSTEMS显示文摘In this paper,the field method for solving the equations of motion of holonomicnonconservative systems is extended to nonholonomic systems with constant mass and with variablemass.Two examples are given to illustrate its application.Mei Fengxiang (Beijing Institute of Technology) 1989Acta Mechanica Sinica1989,5,3:7
13CL and FTIR analysis on the diamonds in Wafangdian, Liaoning Province显示文摘The CL images show that the internal structures of the diamonds in Wafangdian, Liaoning Province is classified as three types: simple growth girdle zone, multi-stage growth complex girdle zone, and rare agate-like structure. These internal features reflect the complexity of growth processes of the diamonds. The FTIR analyses in micro area on diamond plates reveal the heterogeneity of the impurities of nitrogen and hydrogen. The variety of nitrogen contents and nitrogen aggregation states have been revealed not only in different diamonds from one kimberlite pipe but also in different zones of one diamond. The extent of conversion A defects to the aggregated B form is a function of the nitrogen aggregation temperature (TNA), mantle residence time (tMR), and nitrogen concentration of diamond. The interval of 0.6-0.7Ga from core to rim of diamond growth is obtained by using the FTIR curves and some geological data. The long period of diamond growth is identical with the feature in CL image.CHEN Meihua LU Fengxiang DI Jingru ZHENG Jianping 2000Chinese Science Bulletin2000,45,21:6
14美国农业面源污染控制生态补偿机制与政策措施显示文摘简要概述农业面源污染控制的环境经济相关理论,回顾了美国农业面源污染治理的历程及'最佳管理实践措施',并分别从财政补偿、政策补偿、技术补偿、项目补偿四个方面分析研究美国生态补偿机制与政策措施的经验,从而提出对中国农业面源污染控制的启示。重视激励促进作用,运用多种有效手段,构建监督执行机制,完善技术保障体系等对中国农业面源污染控制生态补偿机制与政策措施的建立和实施具有重要的现实意义。汪洁 马友华 栾敬东 王桂苓 李冬 Fengxiang HAN 2010生态经济(学术版)2010,,2:6
15Textural and chemical zoning in garnets related to mantle metasomatism and deformation processes显示文摘A few texturally-zoned garnets were found in a polymict peridotite (JJG1414) from the Cretaceous kimberlite, Kimberley South Africa. The systematic analyses of electron and ion microprobe as well as laser fluorination technique reveal the existencal of marked elemental and oxygen isotopic zonation in these gamed. corresponding to the textural zonation. The rims are normally enriched in Ca, Ti, Cr, LREE. Sr, Nb, and depleted in Mg, Al and 18O. It is demonstrated that these gamats were infiltrated by melts/fiuids, probably representing the disequilibrated products of fluid-asssted mantle deformation.ZHANG Hongfu Menzies M.A. ZHOU Xinhua LU Fengxiang 2000Chinese Science Bulletin2000,45,2:6
16Mesozoic Volcanism Surrounding Songliao Basin,China: Implication for the Relationship with Evolution of Basin显示文摘MesozoicVolcanismSuroundingSongliaoBasin,China:ImplicationfortheRelationshipwithEvolutionofBasin*LuFengxiangZhuQinwenLiSitian...Lu Fengxiang Zhu Qinwen Li Sitian Xie Yihong Zheng JianpingFaculty of Earth Sciences, China University of Geosciences, Wuhan 430074 1997Journal of Earth Science1997,16,1:5
17A DIFFERENTIAL GEOMETRIC DESCRIPTION FOR TIME-INDEPENDENT CHETAEV'S NONHOLONOMIC MECHANICAL SYSTEM WITH UNILATERAL CONSTRAINTS显示文摘By applying the framework of the tangent bundle geometry to the method of Lagrange multi-pliers,a geometric description of Chetaev’s nonholonomic systems subjected to unilateral nonholonomic con-straints trod unilateral holonomic constraints respectively in time-independent circumstances is presented.Zhang Yi (Department of Urban Constrution,University of Science & Technology of Suzhou,Suzhou 215011,China)Mei Fengxiang (Department of Applied Mechanics,Beijing Institute of Technology,Beijing 100081,China) 2002Acta Mechanica Solida Sinica2002,15,1:4
18Association between plasma brain natriuretic peptide/N-terminal pro-brain natriuretic peptide levels and atrial fibrillation: evidence from a meta-analysis显示文摘Liu Yaowu Xiao Yunyun Chen Xinguang Zhang Fengxiang 2014Chinese Medical Journal2014,,15:4
19Progress and mechanism of breaking glycoconjugates by glycosidases in skin for promoting unhairing and fiber opening-up in leather manufacture.A review显示文摘The glycoconjugates,herein glyco-proteins,existing in animal skins are closely related to the effectiveness of unhairing and fiber opening-up.Glycosidases have been used in leather making processes to reduce pollutants and improve leather quality.But the selection of glycosidases is still blind because the related mechanisms are not well understood yet.Hence,the animal skin structures and glycoconjugates components,the advances in the methods and mechanisms of removing glycoconjugates related to unhairing and fiber opening-up in leather manufacture,the kinds,compositions,structures and functions of typical glycoconjugates in skin are summarized.Then the approaches to destroy them,possible glycosidases suitable for leather making and their acting sites are analyzed based on the recognition of glycoconjugates in skin and the specificities of glycosidases toward substrates.It is expected to provide useful information for the optimization of glycosidases and the development of new enzymes and the cleaner technologies of unhairing and opening up fiber bundles assisted by glycosidases.Fengxiang Luo Xiang Zhong Mengchu Gao Biyu Peng Zhongzhen Long 2020Journal of Leather Science and Engineering2020,2,1:4
20Enhanced microbial reduction of aqueous hexavalent chromium by Shewanella oneidensis MR-1 with biochar as electron shuttle显示文摘Biochar, carbonaceous material produced from biomass pyrolysis, has been demonstrated to have electron transfer property(associated with redox active groups and multi condensed aromatic moiety), and to be also involved in biogeochemical redox reactions. In this study, the enhanced removal of Cr(VI) by Shewanella oneidensis MR-1(MR-1) in the presence of biochars with different pyrolysis temperatures(300 to 800 ℃) was investigated to understand how biochar interacts with Cr(VI) reducing bacteria under anaerobic condition. The promotion effects of biochar(as high as 1.07~1.47 fold) were discovered in this process, of which the synergistic effect of BMBC700(ball milled biochar) and BMBC800 with MR-1 was noticeable, in contrast, the synergistic effect of BMBCs(300–600 ℃) with MR-1 was not recognized. The more enhanced removal effect was observed with the increase of BMBC dosage for BMBC700 + MR-1 group. The conductivity and conjugated O-containing functional groups of BMBC700 particles themselves has been proposed to become a dominant factor for the synergistic action with this strain. And, the smallest negative Zeta potential of BMBC700 and BMBC800 is thought to favor decreasing the distance from microbe than other BMBCs. The results are expected to provide some technical considerations and scientific insight for the optimization of bioreduction by useful microbes combining with biochar composites to be newly developed.Cholnam Ri Jingchun Tang Feng Liu Honghong Lyu Fengxiang Li 2022Journal of Environmental Sciences2022,34,3:3
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