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A remote sensing model for monitoring soil evaporation based on differential thermal inertia and its validation

Science China Earth Sciences 2003年第4期46卷 342-355页

作者：张仁华孙晓敏朱治林苏红波唐新斋 Institute of Geographical Science and Natural Resources Chinese Academy of Sciences

The presently applied remote sensing algorithms and approaches to monitor soil surface fluxes are reviewed at the beginning of this paper, and the bottleneck of the estimation of soil sur-face fluxes lies in the dependence on non remotely sensed parameters (NRSP). A soil surface evaporation model based on differential thermal inertia, only using remotely sensed information, has thus been proposed after many experiments. The key of the model is to derive soil moisture availability by differential thermal inertia rather than local soil parameters such as soil properties and type. Bowen ratio is estimated by means of soil moisture availability instead of NRSP, such as temperature and wind velocity. Net radiation flux and apparent thermal inertia have been used for soil heat flux parameterization, therefore, the objective of evaporation (latent heat flux) inversion for bare soil only by remotely sensed information can be realized. Two NOAA-AVHRR five-band images, taken at Shapotou northwest of China when soil surface temperature approximated to the highest and lowest of the region, were applied in combination with the ground surface information measured synchronously. The distribution of soil evaporation in Shapotou could be determined. Model verification has been performed between the measured soil surface evaporation and the corresponding calculated value of the images, and the result has proved model to be feasible. Fi-nally, the possible errors and further modifications when applying model to fulling vegetation can-opy have been discussed.

关键词： differential thermal inertia, relative residual thermal inertia (RSTI), Bowen ratio, soil surface evaporation.

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inertia SETS OF SYMMETRIC SIGN PATTERN MATRICES

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Numerical Mathematics A Journal of Chinese Universities(English Series) 2001年第2期10卷 226-240页

作者： Frank J.Hall Li 李忠尚 Department of Mathematics and Statistics Georgia State University Atlanta GA 30303 USA

A sign pattern matrix is a matrix whose entries are from the set {+,-,0}. The symmetric sign pattern matrices that require unique inertia have recently been characterized. The purpose of this paper is to more generally investigate the inertia sets of symmetric sign pattern matrices. In particular, nonnegative tri-diagonal sign patterns and the square sign pattern with all + entries are examined. An algorithm is given for generating nonnegative real symmetric Toeplitz matrices with zero diagonal of orders n≥3 which have exactly two negative eigenvalues. The inertia set of the square pattern with all + off-diagonal entries and zero diagonal entries is then analyzed. The types of inertias which can be in the inertia set of any sign pattern are also obtained in the paper. Specifically, certain compatibility and consecutiveness properties are established.

关键词： inertia, sign pattern matrix, inertia set, unique inertia, Toeplitz matrix.

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Description of the Superdeformed Bands of the Odd-Odd Nuclei in A ～ 150 Region

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Communications in Theoretical Physics 2002年第8期38卷 200-204页

作者： ZHANG Da-Li LIU Yu-Xin Department of Physics Huzhou Teacher''s College Huzhou 313000 Zhejiang Province China Department of Physics Peking University Beijing 100871 China Institute of Theoretical Physics Academia Sinica P.O. Box 2735 Beijing 100080 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China

With the supersymmetry scheme including many-body interactions, the global property and the △I ＝ 4bifurcation in the superdeformed (SD) bands of odd-odd nuclei in A ～ 150 mass region are investigated *** results for the γ-ray energies, the dynamical moments of inertia, and energy differences △ Eγ - △ Erefγ are *** shows that this approach is quite powerful in describing not only the SD bands in even-even and odd-A nuclei butalso those in odd-odd nuclei in the mass region.

关键词： superdeformed band, dynamical moment of inertia, △I = 4 bifurcation, odd-odd nuclei

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