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Parameterization of the Absorption of the H_(2)O Continuum,CO_(2),O_(2),and Other Trace Gases in the fu-Liou Solar Radiation Program

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Advances in Atmospheric Sciences 2005年第4期22卷 545-558页

作者：张凤曾庆存 y.GU k.N.LIOU InstituteofAtmosphericPhysics ChineseAcademyofSciencesBeijing100029 DepartmentofAtmosphericandOceanicSciences UniversityofCaliforniaLosAngelesCalifornia90095

The absorption properties of the water vapor continuum and a number of weak bands for H2O, O2, CO2, CO, N2O, CH4, and O3 in the solar spectrum are incorporated into the fu-Liou radiation parameterization program by using the correlated k-distribution method (CkD) for the sorting of absorption lines. The overlap absorption of the H2O lines and the H2O continuum (2500-14500 cm-1) are treated by taking the two gases as a single-mixture gas in transmittance calculations. furthermore, in order to optimize the computation efforts, CO2 and CH4 in the spectral region 2850-5250 cm-1 are taken as a new single-mixture gas as well. For overlap involving other absorption lines in the fu-Liou spectral bands, the authors adopt the multiplication rule for transmittance computations under which the absorption spectra for two gases are assumed to be uncorrelated. Compared to the line-by-line (LBL) computation, it is shown that the errors in fluxes introduced by these two approaches within the context of the CkD method are small and less than 0.48% for the H2O line and continuum in the 2500-14500 cm-1 solar spectral region, -1% for H2O (line)+H2O (continuum)+CO2+CH4 in the spectral region 2850-5250 cm-1, and -1.5% for H2O (line)+H2O (continuum)+O2 in the 7700-14500 cm-1 spectral region. Analysis also demonstrates that the multiplication rule over a spectral interval as wide as 6800 cm-1 can produce acceptable errors with a maximum percentage value of about 2% in reference to the LBL calculation. Addition of the preceding gases increases the absorption of solar radiation under all sky conditions. For clear sky, the increase in instantaneous solar absorption is about 9%-13% (~12 W m^2) among which the H2O continuum produces the largest increase, while the contributions from O2 and CO2 rank second and third, respectively. In cloudy sky, the addition of absorption amounts to about 6-9 W m-2. The new, improved program with the incorporation of the preceding gases produces a smaller solar a

关键词： non-gray gas absorption correlated k-distribution method fu-Liou code

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Photocatalytic properties of CaTi_(2)O_(5)via a facile additive-free aqueous strategy with different pH values

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Rare Metals 2021年第7期40卷 1746-1752页

作者： Wei-Xia Dong Qi-fu Bao X-yGu Hui-Juan Shen Peng-yan Liu Department of Material Science and Engineering Jingdezhen Ceramic InstituteJingdezhen 333001China

CaTi_(2)O_(5)was selectively prepared by a solvothermal process without template and *** phase of the as-prepared samples was determined by X-ray diffraction(XRD).The microstructure was characterized by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Results found that pH values had a crucial effect on the crystal phase and shape evolution of the ***_(2)O_(5)sample prepared at pH of 5.2 shows high efficient light harvesting,large surface area and ***,CaTi_(2)O_(5)shuttle-like sample shows good photocatalytic activity against methyl orange due to its longer and thinner shuttle-like morphology and high crystallinity,enhanced light harvesting and large surface *** photocatalytic rate of CaTi_(2)O_(5)shuttle-like structure reaches 0.1988 min-1 for 25-min methyl orange degradation under the ultraviolet light irradiation and displays an excellent photostability with a degradation efficiency of 0.1952 min^(-1)after four cycles.

关键词： pH CaTi_(2)O_(5) Solvothermal method Photocatalytic properties

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PHOTODEGRADATION OF p-NITROCHLORBENZENE(p-NCB)USING NANOMETER-SIZED ZnO PARTICLES PREPARED By REACTIVE EVAPORATION METHOD

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Acta Metallurgica Sinica(English Letters) 2004年第2期17卷 181-188页

作者： A.A.A.Saleh X.J.Zhai y.C.Zhai y.fu M.M.Elomella School of Materials and Metallurgy,Northeastern University,Shenyang 11O006,China School of Materials and Metallurgy Northeastern UniversityShenyang 110006China

Photocatalytic degradations of p-nitrochlorbenzene (p-NCB) with distilled water wereinvestigated with ZnO crystals (catalyst) of 70nm in diameter under UV irradiation.The suitable experimental conditions are determined as: ZnO 0.25g, pH 7, p-NCBconcentration 30mg/L. These variables in terms of the degradation rate have beendiscussed, which was defined as the rate of the initial degradation to the final degrada-tion of p-NCB. When all of the experimental degradation rate values are plotted as afunction of irradiation time, all of the points appeared on a single line for wide range ofp-NCB degradations. On the basis of these results, it has been concluded that at lowerZnO catalyst amount, much of the light is transmitted through the slurry in the con-tainer beaker, while at higher catalyst amount, all the incident photons are observedby the slurry. Degradation rates of p-NCB were found to decrease with increasingsolution pH. It has been concluded that the maximum degradation rate values of p-NCB under principally the same experimental conditions mentioned above are 97.4%,98.8% and 95.5% at 100min respectively. The results suggest that the photocatalyticdegradation is initiated by an oxidation of the p-NCB through ZnO surface-adsorbedhydroxyl radicals. Absorption spectra are recorded using spectrophotometer before andafter UV-irradiation in the wavelength range 200-400nm at room temperature. Itis found that the variation of irradiation time over the range 20-100min resulted inchange in the form of the spectrum linear absorption and a higher maximum valuewill be obtained at longer irradiation time.

关键词： reactive evaporation method nano-ZnO particles pnitrochlorbenzene (p-NCB, ultraviolet light spectrophotometer catalyst

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等离子体浸没离子注入在绝缘材料处理中的应用

等离子体浸没离子注入在绝缘材料处理中的应用

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2004全国荷电粒子源、粒子束学术会议

作者：田修波杨士勤 ricky.k.y.fu Paul k.Chu 现代焊接生产技术国家重点实验室材料科学与工程学院哈尔滨工业大学现代焊接生产技术国家重点实验室材料科学与工程学院哈尔滨工业大学 Department of Physics & Materials Science City University of Hong kong Hong kong Department of Physics & Materials Science City University of Hong kong Hong kong

等离子体浸没离子注入是一种新形式的离子注入技术,利用负偏压工件周围形成的等离子体鞘层进行离子加速、进而获得离子注入。等离子体注入的前提条件是:工件导电。对于绝缘材料的等离子体注入可能存在问题。本文从理论和实际处理的角度... 详细信息

等离子体浸没离子注入是一种新形式的离子注入技术,利用负偏压工件周围形成的等离子体鞘层进行离子加速、进而获得离子注入。等离子体注入的前提条件是:工件导电。对于绝缘材料的等离子体注入可能存在问题。本文从理论和实际处理的角度论证了绝缘材料等离子体注入的可能性、可操作性,并给出了一些实际例证。

关键词：绝缘材料工件表面等离子体浸没离子注入等离子体鞘层

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Dynamic soil-tunnel interaction in layered half-space for incident plane SH waves

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Earthquake Engineering and Engineering Vibration 2016年第4期15卷 715-727页

作者： fu Jia Liang Jianwen Qin Lin State key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Department of Civil Engineering Tianjin University

The dynamic soil-tunnel interaction is studied by indirect boundary element method （IBEM）, using the model of a rigid tunnel in layered half-space, which is simplified to a single soil layer on elastic bedrock, subjected to incident plane SH waves. The accuracy of the results is verified through comparison with the analytical solution. It is shown that soil-tunnel interaction in layered half-space is larger than that in homogeneous half-space and this interaction mechanism is essentially different from that of soil-foundation-superstructure interaction.

关键词： underground tunnel layered half-space plane SH wave indirect boundary element method soil-tunnel interaction site dynamic characteristics

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ASyMPTOTICS FOR THE DISTRIBUTION fuNCTION ESTIMATORS OF THE ERRORS IN SEMI-PARAMETRIC REGRESSION MODELS

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Journal of Systems Science & Complexity 2014年第2期27卷 360-369页

作者： QIU yuyang fu keang HUANG Wei School of Statistics and Mathematics Zhejiang Gongshang University Department of Mathematics Zhejiang University

This paper considers the convergence rates for nonparametric estimators of the error distribution in semi-parametric regression models. By establishing some general laws of the iterated logarithm, it shows that the rates of convergence of either the empirical distribution or a smoothed version of the empirical distribution function matches exactly the rates obtained for an independent sample from the error distribution.

关键词： Empirical distribution function kernel distribution function law of the iterated loga-rithm semi-parametric regression model residuals.

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Interfacial bonding mechanism in Al/coated steel dissimilar refill friction stir spot welds

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Journal of Materials Science & Technology 2019年第6期35卷 1027-1038页

作者： Z. Shen y. Ding J. Chen B. Shalch Amirkhiz J.Z. Wen L. fu A.P. Gerlich School of Materials Science and Engineering Northwestern Poly technical University Xi'an 710072 China Shanxi key Laboratory of Friction Welding Technologies Northwestern Polytechnical University Xi'an 710072 China State key Laboratory of Solidification Processing Northwestern Poly technical University Xi'an 710072 China Centre of Advance Materials Joining Department of Mechanical and Mechatronics Engineering University of Waterloo 200 University Ave. Waterloo N2L3G1 Ontario Canada CanmetMATERIALS Natural Resources Canada Hamilton L8P 0A5 Canada

Defect-free dissimilar Al/zinc coated steel and Al/AlSi coated steel welds were successfully fabricated by refill friction stir spot welding. However, Al alloy and uncoated steel could not be welded under the same welding condition. Al-Zn eutectic layer formed at the Al/zinc coated steel interface showed nonuniformity in thickness and nanoscale intermetallic(IMC) produced was discontinuous. The bonding formation between the Al-Zn layer and the surrounding materials was attributed to a liquid/solid reaction mechanism. Bonding formation at Al alloy and AlSi coated steel interface was attributed to a solid/solid reaction mechanism, as the joining process did not involve with melting of base metals or AlSi coating materials. kissing bond formed at the weld boundary acted as a crack initiation and propagation site,and the present study showed that weld strength of Al 5754/AlSi coated steel was greatly influenced by properties of original IMC layer.

关键词： Refill friction stir spot welding Al alloy Steel Coated materials Joining mechanism

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Development of dynamic slip model for a shear crack

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Earthquake Engineering and Engineering Vibration 2010年第1期9卷 1-7页

作者： Juin-fu Chai Tsung-Jen Teng Center for Research on Earthquake Engineering

The objective of this paper is to develop a dynamic slip model for a shear crack under constant stress drop. This crack problem is formulated by a traction boundary integral equation （BIE） in the frequency domain and then solved by the hyper-singular boundary element method as well as the regularization technique proposed in this paper. Based on the spectral integral form of the kernel function, the unbounded term can be isolated and extracted from the hyper-singular kernel function by using the method of subtracted and added back in wave number domain. Finally, based on the inverse transformation from the frequency domain to the time domain, the time histories of crack opening displacement under constant stress drop can be determined. Three rupture models （simultaneous rupture model, symmetric bilaterally-propagating model and unilaterally propagating model） with specified time histories of stress drop are considered in this paper. Even though these three models will cause the same final slip shapes because of the same constant stress drop, the associated slip time functions differ significantly from each other during the rupture process.

关键词： dynamic rupture model traction boundary element method (BIE) hyper-singular boundary element method (HBEM) regularization technique

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Experimental study on the interfacial delamination in a thermal barrier coating system at elevated temperatures

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第10期11卷 794-803页

作者： Peng-fei ZHAO fu-lin SHANG Department of Engineering Mechanics School of Aerospace Xi 'an Jiaotong University Xi 'an 710049 China

The failure mode and adhesion of thermal barrier coating (TBC) 8ySZ (ZrO2+8% (w/w) y2O3) deposited on NiCoCrAlTay bond coat by atmospheric plasma spraying were investigated. A grooved modified three-point bending specimen that can generate a single interface crack to facilitate the control of crack growth was adopted for testing, which was conducted at the ambient temperature of 100 °C. The morphology and composition of fractured surfaces were examined by means of a scanning electron microscopy (SEM) and an energy disperse spectroscopy (EDS). Images and spectrum show that cracks are initiated and propagated exclusively within ySZ layer adjacent to top/bond coat interface. The load-displacement curves obtained exhibit similar shapes that indicate two distinct stages in crack initiation and stable crack growth. Finite element analyses were performed to extract the adhesion strength of the TBCs. The delamination toughness of the plasma-sprayed 8ySZ coatings at 100 °C, in terms of critical strain energy release rate Gc, can be reliably obtained from an analytical solution.

关键词： Thermal barrier coating (TBC) Three-point bending test Finite element analysis Delamination toughness

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Existence and Gevrey regularity for a two-species chemotaxis system in homogeneous Besov spaces

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Science China Mathematics 2017年第10期60卷 1837-1856页

作者： yANG MingHua fu ZunWei SUN Jinyi School of Information Technology Jiangxi University of Finance and Economics Department of Mathematics Linyi University College of Mathematics and Statistics Northwest Normal University

We study the Cauchy problem of a two-species chemotactic model. Using the Fourier frequency localization and the Bony paraproduct decomposition, we establish a unique local solution and blow-up criterion of the solution, when the initial data（u0, v0, w0） belongs to homogeneous Besov spaces B^˙p,1^-2＋3/p（R^3） ×B^˙r,1^-2＋3/r（R^3） ×B^˙q,1^3/q（R^3） for p, q and r satisfying some technical assumptions. furthermore, we prove that if the initial data is sufficiently small, then the solution is global. Meanwhile, based on the so-called Gevrey estimates, we particularly prove that the solution is analytic in the spatial variable. In addition, we analyze the long time behavior of the solution and obtain some decay estimates for higher derivatives in Besov and Lebesgue spaces.

关键词： two-species chemotaxis system Gevrey regularity Besov spaces blow-up criterion Triebel-Lizorkin spaces

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