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XPS study of tungsten carbide

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Chinese Journal of Chemistry 1990年第4期8卷 301-305页

作者： QIN, Dai-Yi GAO, Zi department of Chemistry, fudan university,{2. department of Chemistry Fudan University Shanghai 200433

The surface composition and electronic structure of tungsten carbides prepared by direct synthesis and carburization of white tungstic acid were studied with X-ray photoelectron spectros- copy. The experimental results show that WO_3 and free carbon are present on the surface of the carbides. For the high surface area tungsten carbide prepared from white tungstic acid a large extent of oxygen insertion into the crystal lattice was observed. Measurements of the binding energies of the W_(47/2., C_(1s) and O_(1s) core levels indicate that charge transfer is from the W to the C and O atoms, forming W_(5d)-C_(2.) and W_(5d)-O_(2.) bonding. The catalytic behavior of the tungsten carbides in hydrocarbon conversion reactions is mentioned and compared with Pt catalysts.

关键词： XPS study of tungsten carbide

n-PENTANE COMBUSTION OVER SOLID SUPERACID SUPPORTED Pt CATALYSTS

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Chinese Journal of Catalysis 1998年第4期 2-3页

作者： Hua Weiming, Gao Zi**(department of Chemistry, fudan university,{2.)

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关键词： Lowtemperature catalytic combustion Platinum catalyst Solid superacid support

Relations Between Characteristic Function,Positive P-Representation and Coherent Thermal State

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Communications in Theoretical physics 2007年第7期48卷 67-70页

作者： FAN Hong-Yi XU Xing-Lei department of Material Science and Engineering,university of Science and Technology of{2.,Hefei 2.002.,china2.department of physics,shanghai Jiao Tong university,shanghai 2.0030,china3 department of physics,Heze university,Heze 2.4015,china department of Material Science and Engineering University of Science and Technology of China department of physics Shanghai Jiao Tong University department of physics Heze University

We employ the coherent thermal states(a kind of entangled states)in thermal field dynamics to establisha complete entangled state formalism expressing pseudo-classical representations of density operator for light ***,the relationship between the coherent thermal state and the characteristic function and the positive Prepresentation in quantum optics theory are obtained.

关键词： coherent thermal state characteristic function positive P-representation

Higher order bulk characteristic parameters of asymmetric nuclear matter

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Science china(physics,Mechanics & Astronomy) 2011年第S1期54卷 124-129页

作者： CHEN LieWen1,2.1department of physics, {2. Jiao Tong university, {2. 2.02.0, china 2.enter of Theoretical Nuclear physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, china 1. department of physics Shanghai Jiao Tong University Shanghai 200240 China 2. Center of Theoretical Nuclear physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China

The bulk parameters characterizing the energy of symmetric nuclear matter and the symmetry energy defined at normal nuclear density ρ0 provide important information on the equation of state (EOS) of isospin asymmetric nuclear matter. While significant progress has been made in determining some lower order bulk characteristic parameters, such as the energy E0(ρ0) and incompress ibility K0 of symmetric nuclear matter as well as the symmetry energy Esym(ρ0) and its slope parameter L, yet the higher order bulk characteristic parameters are still poorly known. Here, we analyze the correlations between the lower and higher order bulk char acteristic parameters within the framework of Skyrme Hartree-Fock energy density functional and then estimate the values of some higher order bulk characteristic parameters. In particular, we obtain J0 = (-355±95) MeV and I0 = (1473±680) MeV for the third order and fourth-order derivative parameters of symmetric nuclear matter at ρ0 and Ksym = (-100 ± 165) MeV, Jsym = (2.4 ± 385) MeV, Isym = (-1309 ± 2.2.) MeV for the curvature parameter, third-order and fourth-order derivative parameters of the symmetry energy at ρ0, using the empirical constraints on E0(ρ0), K0, Esym(ρ0), L, and the isoscalar and isovector nucleon effective masses. Furthermore, our results indicate that the three parameters E0(ρ0), K0, and J0 can reasonably characterize the EOS of symmetric nuclear matter up to 2.0 while the symmetry energy up to 2.0 can be well described by Esym(ρ0), L, and Ksym.

关键词： equations of state of nuclear matter forces in hadronic systems and effective interactions symmetry energy nuclear density functional theory and extensions asymmetric matter neutron matter

Low-heating solid state synthetic reactions of cyclopeantadienyl organolanthanide complexes

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Chinese Science Bulletin 2003年第19期48卷 2041-2043页

作者： ZHU Ming1, LI Yanrong1, LUO Jun1 & ZHOU Xigeng1,2.1. department of Chemistry, fudan university,{2., china 2. State Key Laboratory of Organometallic Chemistry, shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, shanghai 2.0032. china department of Chemistry Fudan University China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai China

A novel and simple one-step, solid state reaction of multicomponent systems has been developed to synthesize cyclopentadienyl-containing organolanthanide complexes, in which the effects of the coordinated solvent molecules and the nature of the reactants were also studied. We also studied the solid state decomposition reaction of Cp2.bPz(HPz), and the formation of [CpYb(Pz)2.2.may indicate that the constrained environment in solid state can lead to a novel chemical transformation, with product selectivity possibly different from that in the liquid phase.

关键词：低热固态反应合成茂基有机镧系络合物绿色化学环戊二烯 [CpYb(Pz)2.2 Cp2.bPz(HPz) 镱配合物

A LEVEL SET METHOD FOR SIMULATION OF RISING BUBBLE

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Journal of Hydrodynamics 2004年第4期16卷 379-385页

作者： HUANGJun-tao ZHANGHui-sheng departmentofMechanicsandEngineeringSciences FudanUniversityShanghai200433China

A level set method, the TVD scheme of second-order upwind procedure coupledwith flux-limiter, and SIMPLE algorithm were incorporated to simulate the flow and interfacialmotion of immiscible two-fluids with large density ratio and viscosity ratios, large topologydistortion and surface tension. As a numerical example axi-symmetric rising bubbles wereinvestigated. It is found that the method is numerically stable and has good convergence propertyand the results are in good agreement with other works.

关键词： level set method high-resolution scheme SIMPLE algorithm rising bubble

An Iterative Formula for the Reflection Coefficient of Multi-layer Thin Film and Its Application in the Design of Optical All Pass Filter

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Chinese Journal of Lasers 2002年第2期11卷 66-70页

作者： MENG Yichao TAN Weihan HUANG Zhaoming( Institute of Communication and Information, shanghai university, shanghai 2.0072. china department of physics, shanghai university, shanghai 2.0436, china) Institute of Communication and Information Shanghai University 上海 200072 department of physics Shanghai University 上海 200436

In this paper, an iterative formula for the reflection coefficient of the multi-layer thin film is deduced and the design of multi-layer thin film gires-tournois interferometer optical all pass filter(GTI-OAPF) is discussed. The group delay τm ranges from 0. 06 to 460 ps and the bandwidth △ω ranges from 0.068 to 0.0000079 (1015 rad/s). By changing the incident angle θ0, the multi-channel dispersion compensation may be achieved.

关键词： iterative formula for the reflection coefficient optical all pass filter GTI-OAPF

An Infinite Horizon Linear Quadratic Problem with Unbounded Controls in Hilbert Space

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Acta Mathematica Sinica,English Series 2001年第3期17卷 527-540页

作者： Han Zhong WU Xun Jing LI department of Mathematics,fudan {2.,shanghai 200433,P.R.china E-mail:hzwu@*** xjli@*** department of Mathematics Fudan University Shanghai 200433 P. R. China

An infinite horizon linear quadratic optimal control problem for analytic semigroup with unbounded control in Hilbert space is *** state weight operator is allowed to be inddefinite while the control weight operator is *** the exponential stabilization condition,it is proved that any optimal control and its optimal trajectory are *** positive real lemma as a necessary and sufficient condition for the unique solvability of this problem is *** closed-loop synthesis of optimal control is given via the solution to the algebraic Riccati equation.

关键词： Infinite horizon LQ problem Unbounded control Two-point boundary value problem Algebraic Riccati equation Frequency characteristic

Synthesis of Nanometer-sized Mesoporous Oxide Spheres

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Chemical Research in Chinese Universities 2001年第2期17卷 143-147页

作者： LUO Qian, LI Li, XUE Zhi-yuan and ZHAO Dong-yuan (department of Chemistry Analysis and Measurement Center, fudan university,{2., P. R. china) fudan Univ Dept Chem Shanghai 200433 Peoples R China fudan Univ Ctr Anal & Measurement Shanghai 200433 Peoples R China

A few hundreds nanometer-sized mesoporous silica and alumina spheres were synthesized in organic solvents. The impacts of ammonia, N, N-dimethylformamide (DMF) and stirring speed were also investigated.

关键词： Nanometer-sized Mesoporous Sphere Silica Alumina