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中国科学院地质与地球物理研究所2002学术年会

作者： dinghui yang~a,zhongjie zhang~b a.department of mathematical sciences,tsinghua university,beijing 100084,pr china. b.institute of geophysics,chinese academy of sciences,beijing 100101,pr china

There is relative motion and inertial coupling between solids and fluids during seismic and acoustic propagation in rocks with *** inertial coupling is anisotropic because of the microvelocity anisotropy of the fluid relative to solid in an anisotropic *** biot mechanism and the squirt-flow mechanism are the two most important mechanisms of solid/fluid interaction in *** extend the biot/squirt(bISQ) theory to include the solid/fluid coupling anisotropy and develop a general poroelastic wave equation including both mechanisms *** new model estimates velocity/frequency dispersion and attenuation of waves propagating in the 2D PTL (periodicthinlayers)+EDA(extensive dilatancy anisotropy) medium with *** attenuation and dispersion of the two quasi-P-waves and the quasi-SV-wave,which are related to the solid/fluid coupling density and the permeability tensors,are *** anisotropy are simultaneously affected by the anisotropics of the solid skeleton,the permeability,and the solid/fluid coupling effect of the *** modeling suggests that variations of attenuation of both the fast quasi-P-wave and the quasi-SV-wave strongly depend on the permeability *** the low-frequency range,the maximum attenuation is in the direction of the maximum permeability for the fast quasi-P-wave and in the direction of the minimum permeability for the *** attenuation behaviors of the two waves in the high-frequency range,however,are opposite to those in the low-frequency *** paper also presents numerically how the attenuation and velocity dispersion of both the fast quasi-P-wave and the quasi-SV-wave are influenced by the anisotropic solid/fluid coupling *** model results demonstrate when the wave propagation is perpendicular to the direction of maximum solid/fluid coupling density,the wave motion exhibits maximum attenuation(Q-1) and maximum velocity dispersion for the fast quasi-P-wave,and m

关键词： Poroelastic wave equation biot/squirt anisotropy

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Differentiation transforming system

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progress in Natural Science:Materials International 2009年第3期19卷 397-406页

作者： Qiang Chenga,b,c,*, Haibin zhang d, bin Wanga, Yonghua Zhao c a LASG, institute of Atmospheric Physics, chinese academy of sciences, beijing 100029, pr china b LSEC, institute of Computing Mathematics, chinese academy of sciences, beijing 100080, pr china c SC, institute of Computer Network Information Center, chinese academy of sciences, beijing 100190, pr china d College of Applied sciences, beijing university of Technology, beijing 100124, pr china [a]LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 PR China [b]LSEC Institute of Computing Mathematics Chinese Academy of Sciences Beijing 100080 PR China [c]SC Institute of Computer Network Information Center Chinese Academy of Sciences Beijing 100190 PR China [d]College of Applied Sciences Beijing University of Technology Beijing 100124 PR China

The differentiation transforming (DFT) system is developed to produce the tangent linear codes, which is used to calculate the Jaco- bian- and the Hessian-vector products with no truncation errors. This paper first gives the introduction of the functionality and features of the DFT system, and then discusses several techniques for the implementation of automatic differentiation tools, including data depen- dence analysis, singular differentiation and code optimization. Finally, the codes generated with DFT used in several applications have been demonstrated.

关键词： Jacobian Hessian Tangent linear model Automatic differentiation

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Challenges in the theoretical investigations of lipid membrane configurations

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chinese Physics b 2013年第2期22卷 36-44页

作者：涂展春 department of Physics Beijing Normal University Kavli institute for Theoretical Physics china Chinese Academy of Sciences

We report some key results in the theoretical investigations of configurations of lipid membranes and present several challenges in this field,which involve（i）the exact solutions to the shape equation of lipid vesicles,（ii）the exact solutions to the governing equations of open lipid membranes,（iii）the neck condition of two-phase vesicles in the budding state,（iv） the nonlocal theory of membrane elasticity,and（v）the relationship between the symmetry and the magnitude of the free energy.

关键词： configuration lipid membrane

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Numerical exploration of new features on three-dimensional transition of a cylinder wake

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Science china.Mathematics 2004年第z1期47卷 69-80页

作者： LING Guocan, XIONG Jun & ZHU KeqinState Key Laboratory of Nonlinear Mechanics, institute of Mechanics, chinese academy of sciences, beijing 100080, China.department of Engineering Mechanics, tsinghua university, beijing 100084, china chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech Beijing 100080 Peoples R China Tsing Hua Univ Dept Engn Mech Beijing 100084 Peoples R China

The three-dimensional transition of the wake flow behind a circular cylinder is studied in detail by direct numerical simulations using 3D incompressible N-S equations for Reynolds number ranging from 200 to 300. New features and vortex dynamics of the 3D transition of the wake are found and investigated. At Re = 200, the flow pattern is characterized by mode A instability. However, the spanwise characteristic length of the cylinder determines the transition features. Particularly for the specific spanwise characteristic length linear stable mode may dominate the wake in place of mode A and determine the spanwise phase difference of the primary vortices shedding. At Re = 250 and 300 it is found that the streamwise vortices evolve into a new type of mode "dual vortex pair mode" downstream. The streamwise vortex structures switch among mode A, mode b and dual vortex pair mode from near wake to downstream wake. At Re = 250, an independent low frequency fm in addition to the vortex shedding frequency fs is identified. Frequency coupling between fm and fs occurs. These result in the irregularity of the temporal signals and become a key feature in the transition of the wake. based on the formation analysis of the streamwise vorticity in the vicinity of cylinder, it is suggested that mode A is caused by the emergence of the spanwise velocity due to three dimensionality of the incoming flow past the cylinder. Energy distribution on various wave numbers and the frequency variation in the wake are also described.

关键词： cylinder, wake, 3D transition, Fourier-spectral-spectral-element method, direct numerical simulation (DNS).

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ON THE HYPER ORDER OF SOLUTIONS OF HIGHER ORDER DIFFERENTIAL EQUATIONS

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chinese Annals of Mathematics,Series b 2003年第4期24卷 501-508页

作者： CHEN ZONGXUAN department of Mathematics, Jiangxi Normai university, Nanchang 330027, china. institute of Mathematics, academy of Mathematics and System sciences, chinese academy of sciences, beijing 100080, china. Jiangxi Normal Univ Dept Math Nanchang 330027 Peoples R China chinese Acad Sci Acad Math & Syst Sci Inst Math Beijing 100080 Peoples R China

The author investigates the hyper order of solutions of the higher order linear equation, andimproves the results of M. Ozawa[15], G. Gundersen[6] and J. K. Langley[12].

关键词： Differential equation Entire function Hyper order

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Entropy number and non-linear approximations on multivariate besov space by manifolds of finite pseudo-dimension

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progress in Natural Science:Materials International 2006年第3期16卷 260-265页

作者： LONG Jingfan and FANG Gensun (School of mathematical sciences, beijing Normal university, beijing 100875, China.department of Computer Science, Information Technology institute, beijing 100101, china. [a]School of mathematical sciences Beijing Normal University Beijing China [b]department of Computer Science Information Technology Institute Beijing China

We determine the asymptotic order of entropy number and optimal non -linear approximations of anisotropic periodic besov class of bpθr(Td') (1≤p≤∞,1≤0≤∞) by manifolds of finite pseudo-dimension in the metric Lq... 详细信息

关键词： Pseudo-dimension anisotropic besov class of functions entropy number nonlinear width.

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Cloning and characterization of 37 kDa laminin receptor precursor in pearl oyster,Pinctada fucata

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progress in Natural Science:Materials International 2008年第2期18卷 233-238页

作者： Yaopeng Fu a,Liping Xie a,b,,Rongqing zhang a,b,a institute of Marine biotechnology,department of biological sciences and biotechnology,tsinghua university,beijing 100084,china.b protein Science Laboratory of the Ministry of Education,tsinghua university,beijing 100084,china institute of Marine biotechnology Department of Biological Sciences and Biotechnology Tsinghua University Beijing 100084 China protein Science Laboratory of the Ministry of Education Tsinghua University Beijing 100084 China

A 1063 bp cDNA clone encoding a putative 37 kDa laminin receptor precursor (37 kDa LRP) is isolated from the mantle tissue of pearl oyster,Pinctada fucata. The amino acid sequence predicted from the cDNA sequence is 301 residues long,with a calculated molec-ular mass of 33.5 kDa. RT-PCR analysis shows that 37 kDa LRP mRNA is especially highly expressed in the mantle while widely expressed in several tissues. In situ hybridization analysis reveals that 37 kDa LRP is expressed in the outer epithelial cells of the mantle edge,suggesting its involvement in cell proliferation and secretion in P. fucata. The identification and characterization of 37 kDa LRP in the pearl oyster will help us to further understand the signal transduction in the processes of mantle epithelial cell proliferation and tissue formation.

关键词： 37 kDa laminin receptor precursor Mantle epithelial cell Pearl oyster

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Comparative analysis of temperature and CO2 fluxes for winter wheat in Tibetan Plain and North china.Plain using the EMD method

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progress in Natural Science:Materials International 2006年第10期16卷 1066-1071页

作者： JIANG Zhaoyang, YU Qiang, LEI Shuhe, WANG Tianduo, SUN Xiaomin and zhang Renhua ( chinese academy of Meteorological Science, beijing 100081, china.institute of Geographic sciences and Natural Resources Research, chinese academy of sciences, beijing 100101, china.Mathematics department, Ocean university of china. Qingdao 266071, china.Shanghai institute of Plant Physiology and Ecology, chinese academy of sciences, Shanghai 200032, china. [a]chinese academy of Meteorological Science Beijing China [b]chinese academy of sciences Institute of Geographic sciences and Natural Resources Research Beijing China [c]Mathematics department Ocean University of China Qingdao China [d]chinese academy of sciences Shanghai Institute of Plant Physiology and Ecology Shanghai China

Comparative study of spectral properties of temperature and CO2 fluxes measured by eddy covariance method at Yucheng (36°57'N, 116°36'E, 28 m a.s.l., in the North china.Plain) and at Lhasa (29°41'N, 91°20'E, 3688 m a.s. 1., on the Tibetan Plateau) is described using the empirical mode decomposition (EMD) method. The main results are: (1) The intrinsic oscillation modes or intrinsic mode functions (IMFs) were extracted from data of temperature ( T) and CO2 fluxes (F) measured at Yucheng ( T1 and F1) and Lhasa ( T2 and F2) . (2) Hilbert transform was applied to these IMF components, then the Hubert-Huang spectra and the marginal spectra of these data were obtained. (3) Comparison of temperature and CO2 fluxes in North china.Plain and on Tibetan Plain illustrated that the characteristic frequencies corresponding to T1, F1, T2 and F2 are 0.05 Hz, 0.03 Hz, 0.014 Hz and 0.005 Hz, respectively.

关键词： empirical mode decomposition (EMD) intrinsic mode function (IMF) flux Hilbert transform wheat Tibet.

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Myotoxic activity of a Gln-49 phospholipase A2 from Agkistrodon blomhoffii ussurensis snake venom

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progress in Natural Science:Materials International 2006年第2期16卷 178-182页

作者： bAO Yongming, bU Pengcheng, yang Jun, yang Wei, JIA Peilin and AN Lijia (department of bioscience and biotechnology, Dalian university of Technology, Dalian 116024, china.institute of biophysics, chinese academy of sciences, beijing 100101, china.Graduate School of chinese academy of sciences, beijing 100039, china. [a.department of bioscience and biotechnology Dalian University of Technology Dalian China [b.institute of biophysics Chinese Academy of Sciences Beijing China [c]Graduate School of chinese academy of sciences Beijing China

A novel myotoxic protein phospholipase A2(PLA2), denoted as Gln49-PLA2, has been isolated from snake venom of Agkistrodon blomhoffii ussurensis, which has weak lethal effect and apparent anticoagulant activity, but lacks the PLA2 and hemorrha-genic activity. Gln49-PLA2 obviously increases of plasma creatine-kinase (CK) upon intramuscular injection in mice, suggesting that it may induce a dose-dependent myonecrosis. Histological studies also reveal morphological changes in mouse skeletal muscles, including extensive myonecrosis, hemorrhage and neutrophil infiltration in the treated animals. The myotoxic ability induced by Gln49-PLA2 can be partially inhibited by heparin.

关键词： snake venom phospholipase A2 Agkistrodon blomhoffii ussurensis myotoxic activity.

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Multiparty quantum secret sharing of classical and quantum messages

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progress in Natural Science:Materials International 2007年第1期17卷 26-31页

作者： CHEN Pan, DENG Fuguo and LONG Guilu ( Key Laboratory for Quantum Information and Measurements, and department of Physics, tsinghua university, beijing 100084, china.Key Laboratory of beam Technology and Material Modification, MOE, institute of Low Energy Nuclear Physics, and department of Material Science and Engineering, beijing Normal university, beijing 100875, china.beijing Radiation Center, beijing 100875, china.Key Laboratory for Atomic and Molecular Nano-sciences, tsinghua university, beijing 100084, china. [a]Key Laboratory for Quantum Information and Measurements and Department of Physics Tsinghua University Beijing China [b]Key Laboratory of beam Technology and Material Modification MOE Institute of Low Energy Nuclear Physics and Department of Material Science and Engineering Beijing Normal University Beijing China [c]beijing Radiation Center Beijing China [d]Key Laboratory for Atomic and Molecular Nano-sciences Tsinghua University Beijing China

A scheme for multiparty quantum secret sharing of classical and quantum messages is proposed by using entanglement swapping. This scheme can distribute not only the classical information but also the quantum informati... 详细信息

关键词： quantum secret sharing classical message quantum message Epr pair.

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