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Simulation of freezing and melting of soil on the northeast Tibetan Plateau

chinese Science Bulletin 2011年第20期56卷 2145-2155页

作者： XIA Kun 1,2.3,LUO Yong 2.4,5.& LI WeiPing 2.1 Institute of Atmospheric Physics,chinese academy of {2.,beijing 10002.,China 2.ational Climate Center,China Meteorological Administration,beijing 100081,China 3{5. University of chinese academy of sciences,beijing 100049,China 4 Center for Earth System Science,Tsinghua University,beijing 100084,China 5.ey Laboratory of Earth System Numerical Simulation,Ministry of Education,beijing 100084,China Institute of Atmospheric Physics Chinese Academy of Sciences National Climate Center China Meteorological Administration graduate University of chinese academy of sciences Center for Earth System Science Tsinghua University Key Laboratory of Earth

Using observational data spanning the period from February to December 2.09 and recorded at the Suli station in Qinghai Province,the land-surface model CLM3.0 was employed to simulate the freezing and melting of *** results indicate that the simulated soil temperature is higher than the observed soil temperature and the ultimate thawing date is earlier than the observed date during the melting *** the freezing period,the simulated soil temperature is lower than the observed soil temperature and the ultimate freezing of the deep soil is earlier than that ***,the simulation of freezing is better than that of melting,and the simulation of a shallow layer is better than that of a deeper *** the original CLM3.0,it is assumed that frozen soil begins to melt when the soil temperature exceeds 0C,which is inconsistent with *** critical freeze-thaw temperature was calculated according to thermodynamics equations and the freeze-thaw condition was *** this work,the melting rate for frozen soil was reduced using the modified scheme,and the simulated soil temperature was lowered. Meanwhile,the refreezing of soil during the melting season was well simulated and more closely matched ***,it was found that the rates of melting and freezing differ,with the former being slower than the latter,but refreezing during the melting season is rather quick.

关键词：土壤温度冻结期青藏高原东北部模拟融化观测数据热力学方程表面模型

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Power functions with low uniformity on odd characteristic finite fields

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Science China Mathematics 2010年第8期53卷 1931-1940页

作者： ZHA ZhengBang 1,3 & WANG XueLi 2.1 school of Mathematical sciences,Luoyang Normal University,Luoyang 47102.,China 2.school of Mathematical sciences,South China Normal University,Guangzhou 5.0631,China 3 State Key Laboratory of Information Security,graduate University of{5.,beijing 100049,China 1. school of Mathematical sciences Luoyang Normal University Luoyang 471022 China3. State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences Beijing 100049 China2. School of Mathematical Sciences South China Normal University Guangzhou 510631 China

In this paper,we give some new low differential uniformity of some power functions defined on finite fields with odd *** corollaries of the uniformity,we obtain two families of almost perfect nonlinear functions in GF... 详细信息

关键词： almost perfect nonlinear function differential uniform function finite field

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Uncertainties in assessing the effect of climate change on agriculture using model simulation and uncertainty processing methods

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chinese Science Bulletin 2011年第8期56卷 729-737页

作者： YAO FengMei QIN PengCheng ZHANG JiaHua LIN ErDa BOKEN Vijendra College of Earth Science Graduate University of Chinese Academy of Sciences Beijing 100049 China Center for Earth Observation and Digital Earth Chinese Academy of Sciences Beijing 100094 China chinese academy of Meteorological {2. Beijing 100081 China school of Geoscience Yangtze University Jingzhou 434025 China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural Sciences Beijing 100081 China Department of Geography and Earth Science University of Nebraska at Kearney Kearney NE 68849 USA

Model simulation is an important way to study the effects of climate change on *** assessment is subject to a range of uncertainties because of either incomplete knowledge or model technical uncertainties,impeding effective decision-making to climate *** the basis of uncertainties in the impact assessment at different levels,this article systematically summarizes the sources and propagation of uncertainty in the assessment of the effect of climate change on agriculture in terms of the climate projection,the assessment process,and the crop models linking to climate ***,techniques and methods focusing on different levels and sources of uncertainty and uncertainty propagation are introduced,and shortcomings and insufficiencies in uncertainty processing are pointed ***,in terms of how to accurately assess the effect of climate change on agriculture,improvements to further decrease potential uncertainty are suggested.

关键词：不确定性模型影响评估气候变化农业影响模型模拟不确定性传播气候预测气候模型

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Quantitative estimation of the shrub canopy LAI from atmosphere-corrected HJ-1 CCD data in Mu Us Sandland

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Science China Earth sciences 2010年第S1期53卷 26-33页

作者： CHEN Wei1,2.CAO ChunXiang1,HE QiSheng1,2.GUO HuaDong3,ZHANG Hao1,2.LI RenQiang4,ZHENG Sheng1,2.XU Min1,2.GAO MengXu1,2.ZHAO Jian1,2.LI Sha1,NI XiLiang1,2.JIA HuiCong1,JI Wei1,TIAN Rong1,2.LIU Cheng1,2.ZHAO YuXing5.& LI JingLu6 1 State Key Laboratory of Remote Sensing Science,Jointly Sponsored by the Institute of Remote Sensing Applications of chinese academy of sciences and beijing Normal University,beijing 100101,China 2.graduate University of chinese academy of sciences,beijing 100049,China 3 Center for Earth Observation and Digital Earth,chinese academy of sciences,beijing 100190,China 4 China Key Laboratory of Ecological Network Observation and Modeling,Institute of Geographical sciences and Natural Resources Research,chinese academy of sciences,beijing 100101,China 5.Ordos Forestry Sand Control Science Institute,Dongsheng 017000,China 6 Inner Mongolia Biomass Thermoelectricity Limited Company,Wushen 017300,China 1. State Key Laboratory of Remote Sensing Science Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University Beijing 100101 China 2. graduate University of chinese academy of sciences Beijing 100049 China 3. Center for Earth Observation and Digital Earth Chinese Academy of Sciences Beijing 100190 China 4. China Key Laboratory of Ecological Network Observation and Modeling Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China 5. Ordos Forestry Sand Control Science Institute Dongsheng 017000 China 6. Inner Mongolia Biomass Thermoelectricity Limited Company Wushen 017300 China

The leaf area index(LAI) is an important ecological parameter that characterizes the interface between vegetation canopy and the *** addition,it is used by most process-oriented ecosystem *** paper investigates the potential of HJ-1 CCD data combined with linear spectral unmixing and an inverted geometric-optical model for the retrieval of the shrub LAI in Wushen Banner of Inner Mongolia in the Mu Us ***(Moderate Resolution Atmospheric Radiance and Transmittance Model) was used for atmospheric *** was extracted using the threshold of the normalized difference vegetation index,with which water bodies and farmland were separated,in combination with a vegetation map of the People's Republic of China(1:1000000).Using the geometric-optical model,we derive the per-pixel reflectance as a simple linear combination of two components,namely sunlit background and *** fraction of sunlit background is related to the shrub *** the support of HJ-1 CCD data,we employ linear spectral unmixing to obtain the fraction of sunlit background in an atmospherically corrected HJ *** addition,we use the measured shrub canopy structural parameters for shrub communities to invert the geometric-optical model and retrieve the pixel-based shrub *** total,18 sample plots collected in Wushen Banner of Inner Mongolia are used for *** results of the shrub LAI show good agreement with R2.of 0.817 and a root-mean-squared error of 0.173.

关键词： shrub leaf area index inversion HJ-1 data geometric-optical model MODTRAN Mu Us Sandland

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Properties of the 3/2.-[5.0}] band in the odd-N rare-earth nuclei

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Science China(Physics,Mechanics & Astronomy) 2011年第S1期54卷 37-43页

作者： CHEN Liang1,2. ZHOU XiaoHong1,2. ZHANG YuHu1, ZHANG ShuangQuan3 & ZHU LiHua4 1Institute of Modern Physics, chinese academy of sciences, Lanzhou 730000, China 2.1} University of chinese academy of sciences, {5. 100049, China 3State Key Laboratory of Nuclear Physics and Technology, school of Physics, Peking University, {5. 100871, China 4China Institute of Atomic Energy, {5. 102.13, China 1. Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China4. China Institute of Atomic Energy Beijing 102413 China

High-spin states in 161Er have been studied experimentally via the 15.Nd(16O, 5.) reaction at a beam energy of 86 MeV. Three rotational bands built on the 5.2.[642., 3/2.[5.0}], and 11/2.[5.5. configurations have been extended up to high-spin states, and particularly, the α = -1/2.branch of the ground state 3/2.[5.0}] band has been revised significantly. It is found that signature inversion occurs in the 3/2.[5.0}] band after the band crossing in 161Er. The systematics of the signature inversion associated with the 3/2.[5.0}] configuration in the rare-earth region is discussed. The band properties are analyzed within the framework of a triaxial particle-rotor model, and a triaxial deformation is proposed to the 3/2.[5.0}] band.

关键词： high-spin states signature inversion triaxial particle-rotor model

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Multiparty simultaneous quantum identity authentication with secret sharing

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Science China(Physics,Mechanics & Astronomy) 2008年第3期51卷 321-327页

作者： YANG YuGuang1,2.WEN QiaoYan3 & ZHANG Xing4,5.1 College of Computer Science and Technology,beijing University of Technology,beijing 10002.,China 2.State Key Laboratory of Information Security ({2. University of the chinese academy of sciences),beijing 100049,China 3 {5. of Science,beijing University of Posts and Telecommunications,beijing 100876,China 4 Institute of Electronic Technology,Information Engineering University,Zhengzhou 45.004,China 5.Trusted Computing Laboratory,beijing University of Technology,beijing 10002.,China College of Computer Science Technology Beijing University of Technology Beijing 100022 China State Key Laboratory of Information Security [graduate University of the chinese academy of sciences] Beijing 100049 China school of Science Beijing University of Posts Telecommunications Beijing 100876 China Institute of Electronic Technology Information Engineering University Zhengzhou 450004 China Trusted Computing Laboratory Beijing University of Technology Beijing 100022 China

Two multiparty simultaneous quantum identity authentication (MSQIA) protocols based on secret sharing are presented. All the users can be authenticated by a trusted third party (TTP) simultaneously. In the first protocol,the TTP shares a random key K with all the users using quantum secret sharing. The ith share acts as the authentication key of the ith user. When it is necessary to perform MSQIA,the TTP generates a random number R secretly and sends a sequence of single photons encoded with K and R to all the users. According to his share,each user performs the corresponding unitary operations on the single photon sequence sequentially. At last,the TTP can judge whether the impersonator exists. The sec-ond protocol is a modified version with a circular structure. The two protocols can be efficiently used for MSQIA in a network. They are feasible with current technol-ogy.

关键词： quantum identity authentication secret sharing quantum cryptography

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Synchrotron peak luminosity,black hole mass and Eddington ratio for SDSS flat-spectrum radio quasars

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Science China(Physics,Mechanics & Astronomy) 2010年第S1期53卷 202-206页

作者： GU MinFeng1 & CHEN ZhaoYu1,2.1 Key Laboratory for Research in Galaxies and Cosmology,Shanghai Astronomical Observatory,chinese academy of {2.,Shanghai 2.0030,China 2.graduate University of the chinese academy of sciences,{5. 100049,China 1. Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China 2. graduate University of the chinese academy of sciences Beijing 100049 China

For a sample of 185.flat-spectrum radio quasars(FSRQs) constructed from the SDSS DR3 quasar catalog,we found a significant correlation between the synchrotron peak luminosity and both the black hole mass and Eddington *** implies that the physics of its jet formation is not only tightly related with the black hole mass,but also with the accretion *** verify that the synchrotron peak luminosity can be a better indicator of jet emission than 5.GHz luminosity,through comparing the relationships between each of these two parameters and both black hole mass and Eddington *** fundamental plane of black hole activity for our FSRQs is established as Lr ∝ L0x.80 ± 0.06 Mbh -0.04 ± 0.09 with a weak dependence on black hole mass,however,the scatter is significant.

关键词： black hole physics galaxies:active galaxies:nuclei quasars:emission lines quasars:general

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The Impacts of Permafrost Change on NPP and Implications:A Case of the Source Regions of Yangtze and Yellow Rivers

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Journal of Mountain Science 2011年第3期8卷 437-447页

作者： FANG Yiping QIN Dahe DING Yongjian YANG Jianping XU Keyan Institute of Mountain Hazards & Environment Chinese Academy of Sciences Chengdu 610041 China Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China graduate school of{2. Beijing 100049 China

This paper studies the relationship between net primary productivity (NPP) and annual average air temperature (GT) at 0cm above ground in permafrost regions by using revised Chikugo NPP model,cubic spline interpolating functions,and non-linear regression *** source regions of the Yangtze and Yellow Rivers were selected as the research *** illustrate that:(1) There is significant non-linear relationship between NPP and GT in various typical years;(2. The maximum value of NPP is 6.17,5.87,7.73,and 5.41 DM·t·hm-2.·a-1 respectively,and the corresponding GT is 7.1,10.0,2..2.and 8.9 o C respectively in 1980,1990,2.00 and 2.07;(3) In 1980,the sensitivity of NPP to GT is higher than in 1990,2.00 and *** tendency shows that the NPP presents change from fluctuation to an adaptation process over time;(4) During 1980～2.07,the accumulated NPP was reduced to 8.05.and the corresponding carrying capacity of theoretical livestock reduced by 11%;(5. The shape of the demonstration region of ecological compensation system,livelihood support system,and science appraisal system in the source regions of Yangtze and Yellow Rivers are an important research for increasing the adaptation capacity and balancing protection and development.

关键词： The source regions of Yangtze and Yellow Rivers Permafrost Ground temperature (GT) Net primary productivity (NPP) Policy adaptation

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Susceptibility Assessment of Landslides Caused by the Wenchuan Earthquake Using a Logistic Regression Model

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Journal of Mountain Science 2010年第3期7卷 234-245页

作者： SU Fenghuan Key Laboratory of Mountain Hazards and Land Surface Processes Chinese Academy of Sciences Chengdu China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu China graduate University of the chinese academy of sciences Beijing China

The Wenchuan earthquake on May 12.2.08 caused numerous collapses,landslides,barrier lakes,and debris *** susceptibility mapping is important for evaluation of environmental capacity and also as a guide for post-earthquake *** this paper,a logistic regression model was developed within the framework of GIS to map landslide *** County,a heavily affected area,was selected for the *** of landslides was prepared by interpretation of multi-temporal and multi-resolution remote sensing images(ADS40 aerial imagery,SPOT5.imagery and TM imagery,etc.) and field *** Certainly Factor method was used to find the influencial factors,indicating that lithologic groups,distance from major faults,slope angle,profile curvature,and altitude are the dominant factors influencing *** weight of each factor was determined using a binomial logistic regression *** susceptibility mapping was based on spatial overlay analysis and divided into five *** faults have the most significant impact,and landslides will occur most likely in areas near the *** of the area has a high or very high susceptibility,located in the northeast,south and southwest,including 65.3% of all landslides coincident with the *** susceptibility map can reveal the likelihood of future failures,and it will be useful for planners during the rebuilding process and for future zoning issues.

关键词： Landslide susceptibility WenchuanEarthquake GIS logistic regression certainty factor

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Round-optimal zero-knowledge proofs of knowledge for NP

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Science China(Information sciences) 2012年第11期55卷 2473-2484页

作者： LI HongDa1,FENG DengGuo2.LI Bao1 & XUE HaiXia1 1State Key Lab of Information Security,graduate University of chinese academy of sciences,{2. 100049,China 2.tate Key Lab of Information Security,Institute of software of chinese academy of sciences,{2. 100080,China 1. State Key Lab of Information Security Graduate University of Chinese Academy of Sciences Beijing 100049 China2. State Key Lab of Information Security Institute of software of Chinese Academy of Sciences Beijing 100080 China

It is well known that all the known black-box zero-knowledge proofs of knowledge for NP are *** there exit constant-round black-box zero-knowledge proofs of knowledge for all NP languages under certain standard assumptions is an open *** paper focuses on the problem and gives a positive answer by presenting two constructions of constant-round(black-box) zero-knowledge proofs of knowledge for the HC(hamiltonian cycle) *** the recent result of Katz,our second construction which relies on the existence of claw-free functions has optimal round complexity(5.round) assuming the polynomial hierarchy does not collapse.

关键词： zero-knowledge proofs proofs of knowledge black-box simulation constant-round

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