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| 1 | EXISTENCE OF THE MINIMAL POSITIVE SOLUTION OF SOME NONLINEAR ELLIPTIC SYSTEMS WHEN THE NONLINEARITY IS THE SUM OF A SUBLINEAR AND A SUPERLINEAR TERM显示文摘It is shown that there exists Λ>0 such that, for every λ∈(0,Λ), the semilinear elliptic system: - Δ u=λu|u| q-1 +u|u| p-1 -v inΩ, - Δ v=δu-γv in Ω, u=v=0 on Ω, where Ω∈R N(N≥2) is a bounded domain with smooth boundary and 0 | Nicolae Tarfulea (Department of Mathematics, the Pennsylvania State University, University Park, PA 16802, U S A) | 2000 | Applied Mathematics and Mechanics(English Edition)2000，21，3： | 2 |
| 2 | Effect of La on Partial Oxidation of Ethanol to Hydrogen over Ni/Fe Catalysts显示文摘The partial oxidation of ethanol to hydrogen was investigated over Ni/Fe/La catalysts prepared by the co precipitation method. The effects of introduction of La promoter and the reaction temperature on the catalytic performance were studied. It was found that the introduction of La into Ni/Fe catalysts is helpful to increase the selectivity to hydrogen and the stability of the catalysts. The results of XRD and XPS characterization show that the structure of the catalyst was changed during the reaction. The existence of LaFeO 3 species is possibly the main reason of the increase of the catalyst stability. | WANG Wei ping, WANG Zhi fei, DING Yan and LU¨ Gong xuan ** State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China | 2003 | Chemical Research in Chinese Universities2003，19，2： | 2 |
| 3 | Constitution of the United States of America显示文摘 | States U States U | 1978 | National Legislative Bodies1978，1，1： | 1 |
| 4 | The Declaration of Independence and the Constitution of the United States of America显示文摘 | States U House U S C | 2011 | House Documents2011，，： | 1 |
| 5 | Nickel (Ⅱ) Complex Catalyzed Conjugate Addition Reaction of Functionalized Organozinc Reagents to α,β-Unsaturated Esters显示文摘Functionalizedorganozinchandes(FG-ZnX)haveprovedtobeveryusefulinorganicsynthesisinrecentyears'.Theycanalsobesuccessfullyusedinconjugateadditionreactionswithcarbonylcompounds'.However,stoichiometriccoppersaltCuCN'ZLiCImustbeusedinmostcasesl'2andunsatu... | Yu Lai HU Jian Hua YU Shi Yan YANG Yuan Qi YIN Jin Xian WANG(State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics. Chinese Academy of Sciences, Lanzhou 730000)(Department of Chemistry, Northwest Normal U | 1999 | Chinese Chemical Letters1999，10，1： | 1 |
| 6 | SPECTRUM CHARACTERISTICS OF MAJOR IONCONCENTRATIONS AT WUHAN SECTOIN OF THECHANGJIANG RIVER显示文摘ABSTRACT: Spectrum analyses of water quality time series have been carried out for five hydrometric stations including Wuhan hydrometric station of the Changjiang( Yangtze) River, etc. The fluctuations of Ca2 +, Mg2+ and HCO3-concentrations in river water under different physical geography conditions have about two-year cycle which is corresponding to hydrometeorological quasi-biannual-oscillation(QBO). Na + Cl- SO2-4 have about two-year cycle in the area lightly affected by human activities while two-year cycle doesn’t exist in the area heavily affected by human activities. All the fluctuations of major ions have about three-month cycle. The river discharge fluctuation accounts for 43. 9% , 45.1%, 54.3%, 33.9%, 30.3% and 42. 7% of the variance of Ca2 +, Mg2+ HC03-, Na+ Cl-, SO2-4, respectively, at Wuhan from 1962 to 1985. According to the spectrum characteristic of major ions, the duration of the time series has to be at least 13 years for trend analysis of monthly water quality data. | XIA Xing-hui1, CHEN Jing-sheng2, CAI Xu-yi3(1. Institute of Environmental Sciences, Beijing Normal University / State Key Joint Laboratory of EnvironmentalSimulation and Pollution Control, Beijing 100875, P. R. China 2. Department of U | 2001 | Chinese Geographical Science2001，11，4： | 0 |
| 7 | The continental shelf wave of the East China Sea and its effect on the Kuroshio显示文摘The free shelf wave theory is applied to the practical case of the continental shelf in the East China Sea to analyse the effects of the shelf wave on the Kuroshio. The results indicate that the shelf wave in lower frequency travels from north to south and its phase velocity is proportional to the Kuroshio’s current velocity) the maximum current velocity of the Kuroshio lies at the continental margin. The analytical solutions obtained indicate that the hydrodynamic characters of the sea region over the shelf present band structure. The horizontal motion ( x -component) caused by the shelf wave at the margin may be one of the causes for generating wavy pattern of the Kuroshio’s axis . | Kong Xiangde, Yin Xunf u and Li Fanhua First Institute of Oceanography, State Oceanic Administration, Qingdao 266003, China | 1992 | Acta Oceanologica Sinica1992，11，3： | 0 |
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