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Estimating surface evapotranspiration using combined MODIS and CBERS-02 data

Science China(Technological Sciences) 2005年第S2期48卷 145-160页

作者： XIN Xiaozhou1,2, LIU Qinhuo1, TANG Yong1,3, TIAN Guoliang1, GU Xingfa1, LI Xiaowen1,2, ZHENG Hongsheng4.& CHEN Jiayi4.1. State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing Applications, Chinese Academy of Sciences, beijing 100101, China 2. Research Center for Remote Sensing and GIS, department of Geography, beijing normal university, beijing 100875, China 3. Graduate {4. of Chinese Academy of Sciences, beijing 100039, China 4. department of Atmospheric physics, Peking {4., beijing 100871, China State Key Laboratory of Remote Sensing Science Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing 100101 China Research Center for Remote Sensing and GIS Department of Geography Beijing Normal University Beijing 100875 China Graduate university Chinese Academy of Sciences Beijing 100039 China department of Atmospheric physics Peking University Beijing 100871 China

Spatial scale error is one of the most serious problems in the estimates of land surface heat fluxes of sensible and latent from satellite-borne data such as MODIS 1km resolution reflectance and emissive data. One of the feasible and economic ways to decrease the spatial scale error is to use high resolution land use class data together with the MODIS data. CBERS-02 data were used to produce land use class of Baiyangdian area, Hebei Province, China in the autumn of 2004. The area ratio of each class in MODIS pixel was calculated, and used to derive the heat fluxes of the mixed pixel. The results showed that the estimated heat fluxes of soil, sensible and latent have been changed remarkably after using the high resolution land class data. It could be concluded from the comparison between simulated and ground-measured fluxes as well as the theoretical analysis that high resolution land class data are useful to diminishing the scale error of heat fluxes estimated from low resolution satellite data.

关键词： surface evapotranspiration spatial scale error MODIS CBERS land class.

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Optimal reactions for the synthesis of superheavy nucleus ^(270)Hs

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Science China(physics,Mechanics & Astronomy) 2006年第6期49卷 641-648页

作者： LIU Zuhua1,3 & BAO Jingdong1,2 1. Key Laboratory of Beam Technology and Material Modification of Ministry of Education, beijing normal university, beijing 100875, China 2. physics department, beijing normal university, beijing 100875, China 3. China Institute of Atomic Energy, beijing 1024.3, China Key Laboratory of Beam Technology and Material Modification of Ministry of Education Beijing Normal University Beijing China China Institute of Atomic Energy Beijing China physics department Beijing Normal University Beijing China

The superheavy nucleus 270Hs is expected to be a “double-magic” deformed nucleus. We have calculated its cross sections of evaporation residue for the reactions 24.Cm(26Mg,4.)270Hs, 24.Pu(30Si,4.)270Hs, 238U(36S,4.)270Hs and 226Ra(4.Ca,4.)270Hs using a two-parameter Smoluchowski equation. It is found from our results that 226Ra(4.Ca,4.)270Hs and 238U(36S,4.)270Hs are two optimal reactions for the synthesis of the superheavy nucleus 270Hs due to their large negative Q-values.

关键词： diffused fusion barrier,Smoluchowski equation,superheavy nuclei.

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On the weak convergence of super-Brownian motion with immigration

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Science China Mathematics 2009年第9期52卷 1875-1886页

作者： ZHANG Mei School of Mathematical Sciences, beijing normal university, beijing 100875, China School of Mathematical Sciences Beijing Normal University Beijing China

We prove fluctuation limit theorems for the occupation times of super-Brownian motion with immigration. The weak convergence of the processes is established, which improves the results in references. The limiting proc... 详细信息

关键词： super-Brownian motion with immigration occupation time process central limit theorem tightness 60J80 60F05

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Effects of PKCa antisense RNA on human breast cancer cell proliferation and expression of cyclinD1 and CDK4

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Chinese Science Bulletin 1999年第12期44卷 1110-1114页

作者： SANG Jianli WANG YongchaoLaboratory of Cell Biology , department of Biology, beijing normal university, beijing 100875 , China Laboratory of Cell Biology Department of Biology Beijing Normal University Beijing China

The role of PKCα in human breast cancer cell proliferation and expression of cyclinD1 and CDK4.has been investigated using inhibition of PKCα expression by its antisense RNA. When PKCα expression was inhibited the rate of cell proliferation decreased apparently and the levels of cyclinD1 and CDK4.mRNA were lower than the control. The results showed that PKCα, a key member of signal transduction system, played an important role in human breast cancer cell proliferation and had a close relationship with expression of cyclinD1 and CDK4.which control start of cell cycle.

关键词： breast cancer PKCα cell proliferation cyclinD1 CDK4.

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Environmental　risk　assessment　of　the　middle　route　of　south－to－north　water　transferring　source　project　in　China

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Journal of Environmental Sciences 1996年第3期8卷 285-291页

作者： Wang Huadong Wang Fei(Institute of Environmental Sciences,beijing normal university, beijing 100875, China) Institute of Environmental Sciences Beijing Normal University Beijing 100875 China

This paper focused on the environment risk of the middle route of south-to-north water transferring source project in China. Analytic hierarchy process was applied to risk identification,fuzzy probability-fault tree analysis to risk probability assessment,statistics and analogy process to risk consequences assessment, lastly, grey relevant analysis and comprehensive index process to risk impact evaluation. The main environment risk accident of the project is dam failure, the main causative factors of the accident are catastrophic flood and wrecking earthquake. The flash flood, due to dam failure, will impact on nature, society and economy. The major environment risk areas are Jingzhou and Xiangfan,Hubei Province. The environment risk management measures should be adopted in order to ensure the safety of the project-environment complex system.

关键词： water source project environment risk risk assessment

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A Construction of Characteristic Tilting Modules

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Acta Mathematica Sinica,English Series 2002年第1期18卷 129-136页

作者： DENG Bang Ming department of Mathematics. beijing normal university. beijing 100875. P. H. China department of Mathematics Beijing Normal University Beijing P. R. China

Associated with each finite directed quiver Q is a quasi-hereditary algebra. the so-called twisted double of the path algebra kQ. Characteristic tilting modules over this class of quasi-hereditary algebras are constructed. Their endonorphism algebras are explicitly described. It turns out that this class of quasi-hereditary algebras is closed under taking the Ringel dual.

关键词： Quasi-hereditary algebra Characteristic tilting module Ringel dual

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Target-Scarching on Percolation

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Communications in Theoretical physics 2005年第9期44卷 431-434页

作者： YANG Shi--Jie department of physics, beijing normal university, beijing 100875, China

We study target-searching processes on a percolation, on which a hunter tracks a target by smelling odorsit emits. The odor intensity is supposed to be inversely proportional to the distance it propagates. The Monte Carlosimulation is performed on a 2-dimensional bond-percolation above the threshold. Having no idea of the location of thetarget, the hunter determines its moves only by random attempts in each direction. For lager percolation connectivityP0.90, it reveals a scaling law for the searching time versus the distance to the position of the target. The scalingexponent is dependent on the sensitivity of the hunter. For smaller P, the scaling law is broken and the prohability offinding out the target significantly reduces. The hunter seems trapped in the cluster of the percolation and can hardlyreach the goal.

关键词： percolation searching scaling law

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Electrochemical Behavior of Adriamycin at Ni/GC Ion Implantation Modified Electrode

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Chinese Chemical Letters 2000年第7期11卷 601-602页

作者： Jing Bo HU Qi Long LI(department of Chemistry, beijing normal university, Bejing 100875) department of Chemistry Beijing Normal University Beijing 100875 China

With a Ni/GC ion implantation modified electrode as working electrode, in 0.1 mol/L HOAc-NaOAc (pH=4.62) solution, a sensitive reductive wave of ADM was obtained by linear sweep voltammetry. The peak potential was -0.55 V (***). The peak current is proportional to the concentration of ADM with a detection limit of 6.9 X 10(-8) mol/L. The behavior of the reduction wave was studied. The experiments of AES and XPS showed that Ni was surely implanted into the surface of the GCE and the implanted Ni at the GCE improved the electrocatalytic activity.

关键词： ion implantation modified electrode electrochemical behavior adriamycin

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Nash Inequalities for Markov Processes in Dimension One

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Acta Mathematica Sinica,English Series 2002年第1期18卷 147-156页

作者： MAO Yong Hua department of Mathematics. beijing normal university. beijing 100875. P. R. China department of Mathematics Beijing Normal University Beijing P. R. China

In this paper. we give characterizations of Nash inequalities for birth-death process and diffusion process on the line. As a by-product. we prove that for these processes. transience implies that the semigroups P(t) ... 详细信息

关键词： Nash inequalities Hardy type inequality Birth-death process Diffusion

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ALMOST　PERIODIC　SOLUTIONS　OF　NEUTRAL　FUNCTIONAL　DIFFERENTIAL　EQUATIONS　WITH　NONAUTONOMOUS　OPERATOR

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Chinese Annals of Mathematics,Series B 1995年第4期16卷 519-530页

作者： YUAN RONG(department of Mathematics, beijing normal universityl beijing 100875, China.) beijing normal UNIV DEPT MATHBEIJING 100875PEOPLES R CHINA

This paper presents some existence theorems on almost periodic solutions for almost periodicneutral functional differential equation and its perturbed systems by means of Liapunov functional, and extends the correspon... 详细信息

关键词： Almost periodic solution Neutral functional differelltial equation Nonautollomous operator

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