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| 1 | A 60-year journey of mycorrhizal research in China:Past,present and future directions显示文摘The significance of mycorrhizas(fungal roots in 90% of land plants) in plant nutrient acquisition and growth,element biogeo-chemical cycling and maintaining of terrestrial ecosystem structures has been globally established for more than 120 years.Great progress in mycorrhizal research in the past 60 years(1950-2009,1981-2009 in particular) has also been made across China,particularly in the mainland,Hong Kong and Taiwan.For instance,a total of 20 new and ~120 records of arbuscular mycorrhizal(AM) fungal species,30 new and ~800 records of ectomycorrhizal(EM) fungal species,a dozen of new and ~100 records of orchid mycorrhizal(OM) fungal species have been isolated by morphological observation and/or molecular identification in China since the 1950s.Great accomplishment has also been made in the following area,including fungal species richness and genetic structure,relationships between species composition and plant taxa,effects of mycorrhizal fungi on plant nutrient uptake and growth,resistances to pathogens and interactions with other soil microorganisms,potential of mycorrhizal fungi in phytoremediation and/or land reclamation,alterations of enzymatic activities in mycorrhizal plants,and elevated CO2 and O3 on root colonization and species diversity.Unfortunately,the international community cannot easily appreciate almost all Chinese mycorrhizal studies since the vast majority of them have been published in Chinese and/or in China-based journals.The aim of this review is to make a comprehensive exposure of the past and present China's major mycorrhizal research to the whole world,and then to suggest potential directions for the enhancement of future mycorrhizal research within and/or between the Chinese and international mycorrhizal community. | HE XinHua1,2,3*,DUAN YingHua2,CHEN YingLong4 & XU MingGang2 1School of Life Sciences,Yunnan Normal University,Kunming 650092,China 2Key Laboratory of Crop Nutrition and Fertilization,Ministry of Agriculture of China,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China 3Centre for Ecosystem Management,School of Natural Resources,Edith Cowan University,Joondalup,WA 6027 State Centre of Excellence for Ecohydrology,School of Plant Biology,University of Western Australia,Crawley,WA 6009,Australia 4School of Earth and Environment,University of Western Australia,Crawley,WA 6009,Australia | 2010 | Science China(Life Sciences)2010，53，12： | 23 |
| 2 | The biomass and aboveground net primary productivity of Schima superba-Castanopsis carlesii forests in east China显示文摘The biomass and productivity of Schima superba-Castanopsis carlesii forests in Tiantong,Zhejiang Province,were determined using overlapping quadrants and stem analyses.The total community biomass was(225.3±30.1) t hm-2,of which the aboveground parts accounted for 72.0% and the underground parts accounted for 28.0%.About 87.2% of biomass existed in the tree layer.The resprouting biomass was small,of which over 95.0% occurred in the shrub layer.The productivity of the aboveground parts of the community was(386.8±98.9) g m-2a-1,in which more than 96.0% was present at the tree level.The trunk's contribution to productivity was the greatest,while that of leaves was the smallest.In China,the community biomass of subtropical evergreen broadleaved forests differs significantly with the age of the forest.The community biomass of the 52-year-old S.superba-C.carlesii forests in this study was lower than the average biomass of subtropical evergreen broadleaved forests in China,and was lower than the biomass of other subtropical evergreen broadleaved forests elsewhere in the world.Moreover,its productivity was lower than the model estimate,indicating that without disturbance,this community has great developmental potential in terms of community biomass and productivity. | YANG TongHui1,2,SONG Kun1,DA LiangJun1*,LI XiuPeng3 & WU JianPing1 1School of Resources and Environment Science,East China Normal University,Shanghai 200062,China 2Ningbo Academy of Agricultural Science,Ningbo 315040,China 3Ningbo Technology Extension Center for Forestry and Specialty Forest Products,Ningbo 315012,China | 2010 | Science China(Life Sciences)2010，53，7： | 23 |
| 3 | A fast algorithm for color image enhancement with total variation regularization显示文摘In this paper,a novel algorithm for color image enhancement is proposed.The proposed method,which is based on Retinex theory and total variational framework,improves the original variational method by using a TV penalty term to force spatial smoothness on the reflectance image.The split Bregman algorithm is employed to solve the proposed model.By practical experiments,it is verified that our method obtains better enhancement performance and much better calculation efficiency. | LI Ming1,2 1School of Computer Science and Technology,Huazhong University of Science and Technology,Wuhan 430074,China 2Key Laboratory of Education Ministry for Image Processing and Intelligent Control,Wuhan 430074,China | 2010 | Science China(Information Sciences)2010，53，9： | 14 |
| 4 | Research on theory and key technology of trusted computing platform security testing and evaluation显示文摘Trusted computing has become a new trend in the area of international information security, and the products of trusted computing platform begin to be used in application. Users will not use the products of information security, unless it goes through the testing and evaluation. Here we concentrate on the testing and evaluation problem of trusted computing platform, begin with constructing proper formalization model of trusted computing platform for testing, and establish a mathematical chain of trust model based on SPA. Moreover, we give a verification method of composite characteristics and find the potential factors threatening the trusted system in the process of remote attestation through analysis. For trusted software stack, we study the problem of automatic generation of test case and propose an improved method of generating the random test case, to raise the quality of test case. Finally, we give a prototype system of trusted computing platform and the actual test data related. The result demonstrates that there exist some flaws in the architecture of the present TCG computing platform. At the same time, some flaws are found in the products of existing trusted computing platform, thus a basis is laid for the improvement and development of trusted platform technology and its products. | ZHANG HuanGuo1,2, YAN Fei1,2, FU JianMing1,2, XU MingDi1,2, YANG Yang1,2, HE Fan1,2 & ZHAN Jing1,2 1School of Computer, Wuhan University, Wuhan 430072, China 2Key Laboratory of Aerospace Information Security and Trusted Computing, Ministry of Education, Wuhan 430072, China | 2010 | Science China(Information Sciences)2010，53，3： | 11 |
| 5 | Synthesis and Surface Activity of Novel Triazole-based Cationic Gemini Surfactants显示文摘The synthesis and surfactant activities of two new cationic gemini surfactants containing triazole compound as spacer were described. Their critical micelle concentrations (CMC), which are 1.8×10-4 mol/L and 3.9×10-4 mol/L respectively, are much lower than that of conventional surfactant cetyltrimethyl ammonium chloride (CTAC). In addition, compared with some gemini surfactants containing phenylene, xylylene and stilbenyl as spacer, this new kind of surfactants has good solubility in water at room temperature because of containing more hydrophilic groups or atoms in molecules. | Ling Guang QIU1, 2*, An Jian XIE1, Yu Hua SHEN1* 1School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039 2Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 | 2003 | Chinese Chemical Letters2003，14，6： | 10 |
| 6 | Identification of an avirulence gene,avrxa5,from the rice pathogen Xanthomonas oryzae pv.oryzae显示文摘Xanthomonas oryzae pv.oryzae,the causal agent of bacterial blight in rice,interacts with rice plants in a gene-for-gene manner.The specificity of the interaction is dictated by avirulence(avr) genes in the pathogen and resistance(R) genes in the host.To date,no avr genes that correspond to recessive R genes have been isolated.We isolated an avrBs3/pthA family gene,avrxa5,from our previously isolated clone p58,which was originally from strain JXOIII.The avrxa5 gene converted the PXO99A strain from compatible to incompatible in rice cultivars containing the recessive xa5 gene,but not in those containing the dominant Xa5 gene.Sequencing indicated that avrxa5,which is highly similar to members of the avrBs3/pthA family,encodes a protein of 1238 amino acid residues with a conserved carboxy-terminal region containing three nuclear localization signals and a transcription activation domain.It has 19.5 34-amino-acid direct repeats,but the 13th amino acid is missing in the fifth and ninth repetitive units.Domain swapping of the repetitive regions between avrxa5 and avrXa7 changed the avirulence specificity of the genes in xa5 and Xa7 rice lines,respectively.This indicates that avrxa5 is distinct from previously characterized avrBs3/pthA members.The specificity of avrxa5 toward recessive xa5 in rice could help us better understand the molecular mechanisms of plant-pathogen specific interactions. | ZOU HuaSong1,ZHAO WenXiang2,ZHANG XiFu3,HAN YangChun2,ZOU LiFang2 & CHEN GongYou1,2* 1School of Agriculture and Biology,Shanghai Jiaotong University,Shanghai 200240,China 2College of Plant Protection,Nanjing Agricultural University/Laboratory for Monitoring and Management for Plant Pests and Diseases,Chinese Ministry of Agriculture,Nanjing 210095,China 3Department of Agronomy,Henan Vocation-Technical Teachers College,Xinxiang 453003,China | 2010 | Science China(Life Sciences)2010，53，12： | 9 |
| 7 | Effects of estrogen on diverse stem cells and relevant intracellular mechanisms显示文摘Sexual dimorphism definitely exists in the pathogenesis of a variety of cardiovascular,neurodegenerative and bone metabolism disorders.Estrogen affects the healing of ischemic myocardium partially through paracrine growth hormone production by bone marrow mesenchymal stem cells(MSCs) and facilitation on mobilization of endothelial progenitors cells(EPCs) to the ischemic myocardium.Estrogen can also inhibit the proliferation of the cardiac fibroblasts.Therefore,estrogen effectively enhances the neovascularization at the ischemic border zone and limits pathological myocardial remodeling.Moreover,estrogen increases proliferation of embryonic neural stem cells and accelerates differentiation of neurons during neurogenesis,suggesting a possible role of estrogen in transplantation of neural stem cells as a therapeutic approach for neurodegenerative diseases.Finally,estrogen can modulate osteogenic progenitors and osteoclasts,preventing the osteoporosis.In general,estrogen offers significant benefits on diverse stem/progenitor cell populations.A great understanding of estrogens on these cells and relevant intracellular mechanisms will allow modulation of the potent stem cells directly for the ultimate clinical applications. | SUN HaiYing1,WANG HaiFeng2 & HU ShiYu1 1School of Pharmacy,Shanghai Jiao Tong University,Shanghai 200240,China 2First Affiliated Hospital,Henan University of Science and Technology,Luoyang 471003,China | 2010 | Science China(Life Sciences)2010，53，5： | 8 |
| 8 | Resonance between automorphic forms and exponential functions显示文摘Let f be a holomorphic cusp form of weight k for SL2(Z) and λf(n) its n-th Fourier coefficient.In this paper,the exponential sum X | REN XiuMin1,& YE YangBo1,2 1School of Mathematics,Shandong University,Jinan 250100,China 2Department of Mathematics,The University of Iowa,Iowa City,Iowa 52242-1419,USA | 2010 | Science China Mathematics2010，53，9： | 8 |
| 9 | Moving collocation methods for time fractional differential equations and simulation of blowup显示文摘A moving collocation method is proposed and implemented to solve time fractional differential equations. The method is derived by writing the fractional differential equation into a form of time difference equation. The method is stable and has a third-order convergence in space and first-order convergence in time for either linear or nonlinear equations. In addition, the method is used to simulate the blowup in the nonlinear equations. | MA JingTang1 & JIANG YingJun2 1School of Economic Mathematics, Southwestern University of Finance and Economics, Chengdu 611130, China 2Department of Mathematics and Scientific Computing, Changsha University of Science and Technology, Changsha 410076, China | 2011 | Science China Mathematics2011，54，3： | 7 |
| 10 | DNA barcoding provides distinction between Radix Astragali and its adulterants显示文摘Based on variable nuclear and/or organellar DNA sequences among vastly divergent species as well as morphologically indistinguishable species, DNA barcoding is widely applicable in species identification, biodiversity studies, forensic analyses, and authentication of medicinal plants. The roots of Astragalus membranaceus and A. membranaceus var. mongholica are commonly used as Radix Astragali in several Asian countries, including China, Japan, and Korea. However, in addition to the two species recorded in the Chinese Pharmacopoeia, there are twenty-three species from different genera including Astragalus, Oxytropis, Hedysarum, and Glycyrrhiza, which have been used as adulterants not only in trading markets but also by the herbal medicine industry. Therefore, a simple, reliable, and accurate classification method is important for distinguishing authentic Radix Astragali from its adulterants. In this study, we acquired data for 37 samples from four related genera within the family Fabaceae. Then we compared four candidate DNA barcoding markers using ITS, matK, rbcL, and coxI sequences from nuclear, chloroplast, and mitochondrial genomes, all commonly used for plants to identify genetic variations among genera, intraspecies, and interspecies. We observed higher divergences among genera and interspecies for ITS, which have the average Kimura 2-parameter distances of 4.5% and 14.1%, respectively, whereas matK was found to have sufficient divergence at the intraspecific level. Moreover, two indels detected in the matK sequence are useful for PCR studies in distinguishing Radix Astragali from its adulterants. This study suggests that the combined barcoding regions of ITS and matK are superior barcodes for Radix Astragali and further studies should focus on evaluating the applicability and accuracy of such combined markers for a wide range of traditional Chinese herbs. | GUO HaiYan1,2, WANG WeiWei2, YANG Ning2, GUO BaoLin3, ZHANG Sun2, YANG RuiJing2, YUAN Ye2, YU JunLin4, HU SongNian2, SUN QiShi1 & YU Jun2 1School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, China 2Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing 101300, China 3Chinese Academy of Medical Sciences, Peking Union Medical College Institute of Medicinal Plant Development, Beijing 100094, China 4Department of Chemistry, Tonghua Normal College, Tonghua 134002, China | 2010 | Science China(Life Sciences)2010，53，8： | 7 |
| 11 | Alkylation mechanism of benzene with 1-dodecene catalyzed by Et_3NHCl-AlCl_3显示文摘The isotope exchange method was employed to investigate the catalytic mechanism of ionic liquid in alkylation of benzenes with olefins.It is proposed that alkylation was induced by the Lewis acid AlCl3 which attracted π electrons of 1-dodecene to shift toward 1-carbon,thus forming a carbonium ion.The carbonium ion further reacted with benzenes to form a complex.Due to unstabilit of the complex,a deuterated ring proton was transferred into an electronegative 1-carbon of the side chain to substitute for the AlCl3,accordingly 2-phenyldodecane was generated. | QI GuoPeng 1,JIANG Feng 1,SUN XueWen 2 & ZHAO SuoQi 2 1School of Chemical Engineering,Tianjin University,Tianjin 300072,China 2State key Laboratory of Heavy Oil Processing,Petroleum University of China,Beijing 102249,China | 2010 | Science China Chemistry2010，53，5： | 7 |
| 12 | Numerical study on optical and electric-thermal performance for solar concentrating PV/T air system显示文摘Hybrid photovoltaic/thermal(PV/T)system with solar concentrator is an effective way to improve solar energy conversion efficiency.In this work,a single-pass PV/T air system with a three-trough compound parabolic concentrator(CPC)of concentration ratio 2.0 is designed and the solar incident distributions at the solar cell surface are calculated by ray tracing method.Based on energy balance,the heat transfer models of all main components in this system are developed.The effects of some main designing and operational parameters on the electric-thermal performance of the system are analyzed. The results show that the solar radiation intensity can be higher than 1200 W/m 2 at most area of the cell surface.The temperature of the air and cell surface increases along the length of the system.Thus the system efficiency of the CPC is higher than that of the system without the CPC.The thermal efficiency, exergy and electrical efficiency of this CPC system increase with increasing of the air mass flow rate and the length of the system.With increasing packing fraction the electrical efficiency increases,but the thermal efficiency decreases.The exergy efficiency increases slightly with the packing fraction rising.The data obtained in this work are valuable for the design and operation for this kind of solar concentrating PV/T systems. | SUN Jian 1,2 &SHI MingHeng 1 1School of Energy and Environment,Southeast University,Nanjing 210096,China 2Department of Thermal Energy Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333001,China | 2009 | Science China(Technological Sciences)2009，52，12： | 5 |
| 13 | Note on the number of integral ideals in Galois extensions显示文摘Let K be an algebraic number field of finite degree over the rational filed Q.Let ak be the number of integral ideals in K with norm k.In this paper we study the l-th integral power sum of ak,i.e.,∑k≤ x akl(l = 2,3,...).We are able to improve the classical result of Chandrasekharan and Good.As an application we consider the number of solutions of polynomial congruences. | L GuangShi1,& WANG YongHui2 1School of Mathematics,Shandong University,Jinan 250100,China 2Department of Mathematics,Capital Normal University,Beijing 100048,China | 2010 | Science China Mathematics2010，53，9： | 5 |
| 14 | Inhomogenous quantum codes (Ⅰ):additive case显示文摘In this paper,the quantum error-correcting codes are generalized to the inhomogenous quantumstate space Cq1 Cq2 ··· Cqn,where qi(1 i n) are arbitrary positive integers.By attaching an abelian group Ai of order qi to the space Cqi(1 i n),we present the stabilizer construction of such inhomogenous quantum codes,called additive quantum codes,in term of the character theory of the abelian group A = A1⊕A2⊕···⊕An.As usual case,such construction opens a way to get inhomogenous quantum codes from the classical mixed linear codes.We also present Singleton bound for inhomogenous additive quantum codes and show several quantum codes to meet such bound by using classical mixed algebraic-geometric codes. | WANG WeiYang1,FENG RongQuan1 & FENG KeQin2 1School of Mathematical Sciences,Peking University,Beijing 100871,China 2Department of Mathematical Sciences,Tsinghua University,Beijing 100084,China | 2010 | Science China Mathematics2010，53，9： | 4 |
| 15 | Adsorptive desulfurization on a heteroatoms Y zeolite prepared by secondary synthesis显示文摘Gallium atoms have been introduced into the framework of Y zeolite by treating the zeolite with an aqueous solution of ammonium hexafluoro gallate.Desulfurization of various model fuels containing about 500 μg/g sulfur has been studied over the synthesized Y zeolite(GaAlY).The sulfur adsorption capacity is 7.0,17.4,14.5,16.9,6.9 and 5.8 mg(S)/g adsorbent for thiophene,tetrahydrothiophene(THT),4,6-dimethyldibenzothiophene(4,6-DMDBT),dibenzophiophene(DBT),benzothiophene(BT) and 4-methyldibenzothiophene(4-MDBT),respectively.The charges on the S atom in thiophene,THT,4,6DMDBT,DBT,BT and 4-MDBT,calculated using the density functional theory(DFT),are-0.159,-0.298,-0.214,-0.211,-0.193 and-0.188,respectively,implying that the S-M bond between the adsorption sites and thiophene is much weaker than that between the adsorption sites and THT,4,6-DMDBT or DBT.The sulfur removal of FCC gasoline on GaAlY is 68%. | TANG Ke1,HONG Xin1,ZHAO YongHua1,SONG LiJuan2 & SUN ZhaoLin2 1School of Material and Chemical Engineering,Liaoning Institute of Technology,Jinzhou 121001,China 2College of Petrochemical Engineering,Liaoning University of Petroleum & Chemical Technology,Fushun 113001,China | 2010 | Science China Chemistry2010，53，1： | 4 |
| 16 | Information content security on the Internet:the control model and its evaluation显示文摘Flooding of harmful information on the Internet seriously endangers the physiological and mental health of teenagers. Due to the user-friendliness of the Internet as well as the difficulty in the authentication for the access of specific categories of information, curbing the transmission of harmful information, i.e., assuring the information content security (ICS), has become a reasonable yet challenging alternative. At present, there is an urgent need to develop a systematic model that can effectively carry out the curbing. In fact, curbing the transmission of harmful information by way of filtering can be modeled by access control. In the paper, based on the three core-elements of communication, namely, 'Who communicates with whom', 'How do they communicate' and 'What is the content of communication', we propose a control model, called ICCON. Unlike the existing access control, the reference monitor (RM) of our model is placed in the transmission channel, and moreover, an evaluation frame is proposed, through which the effectiveness of the RM in controlling information transmission on the Internet can be quantitatively evaluated. | FANG BinXing1, GUO YunChuan2,3 & ZHOU Yuan4 1School of Computer, Beijing University of Posts and Telecommunications, Beijing 100029, China 2Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China 3Graduate University of Chinese Academy of Sciences, Beijing 100049, China 4National Computer Network Emergency Response Technical Team/Coordination Center of China, Beijing 100029, China | 2010 | Science China(Information Sciences)2010，53，1： | 4 |
| 17 | A community-centric approach to automated service composition显示文摘In the recent years, the web has kept growing rapidly and undergone tremendous changes towards a user-centric environment. With the proliferation of services available on the Internet, millions of users are able to voluntarily participate in and collaborate for their own interests and benefits by means of service composition. However, due to the ever increasing number of services, it then becomes a challenging issue to enable the users to rapidly select and compose the proper services. In this paper, we propose an approach which utilizes service communities for automated service composition. This paper makes three contributions. Firstly, we propose the service community architecture and identify two key components to facilitate service discovery and composition. Secondly, assisted by the service community, we provide two composition types to help users explore the space of potential composition opportunities without having to understand too many details of individual candidate services. Finally, we evaluate our approach by performance analysis and provide a web-based prototype that lowers the entry barrier for the users. | LIU XuanZhe1,2, HUANG Gang1,2 & MEI Hong1,2 1School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China 2Key Laboratory of High Confidence Software Technologies, Ministry of Education, Peking University, Beijing 100871, China | 2010 | Science China(Information Sciences)2010，53，1： | 4 |
| 18 | Quantifying the effectiveness of SiO_2/Au light trapping nanoshells for thin film poly-Si solar cells显示文摘In order to enhance light absorption of thin film poly-crystalline silicon(TF poly-Si)solar cells over a broad spectral range, and quantify the effectiveness of nanoshell light trapping structure over the full solar spectrum in theory,the effective photon trapping flux(EPTF)and effective photon trapping efficiency(EPTE)were firstly proposed by considering both the external quantum efficiency of TF poly-Si solar cell and scattering properties of light trapping structures.The EPTF,EPTE and scattering spectrum exhibit different behaviors depending on the geometric size and density of nanoshells that form the light trapping layer.With an optimum size and density of SiO2/Au nanoshell light trapping layer,the EPTE could reach up to 40%due to the enhancement of light trapping over a broad spectral range,especially from 500 to 800 nm. | BAI YiMing 1 ,WANG Jun 2 ,CHEN NuoFu 1,3 ,YAO JianXi 1 ,YIN ZhiGang 3 ,ZHANG Han 3 , ZHANG XingWang 3 ,HUANG TianMao 3 ,WANG YanShuo 3 &YANG XiaoLi 3 1School of Renewable Energy Engineering,North China Electric Power University,Beijing 102206,China 2 National Engineering Research Center for Optoelectronic Devices,Institute of Semiconductors, Chinese Academy of Sciences,PO Box 912,Beijing 100083,China 3 Key Laboratory of Semiconductor Materials Science,Institute of Semiconductors, Chinese Academy of Sciences,PO Box 912,Beijing 100083,China | 2010 | Science China(Technological Sciences)2010，53，8： | 4 |
| 19 | Hereditary C~*-subalgebras and comparison of positive elements显示文摘Characterizations of hereditary subalgebras generated by subsets of a C*-algebra are given through open projections.Using these results,we give some equivalent conditions of comparison of positive elements. | WEI ChangGuo1,& WANG LiGuang2 1School of Mathematical Sciences,Ocean University of China,Qingdao 266071,China 2School of Mathematical Sciences,Qufu Normal University,Qufu 273165,China | 2010 | Science China Mathematics2010，53，6： | 3 |
| 20 | Preconditioners for higher order edge finite element discretizations of Maxwell's equations显示文摘In this paper,we are concerned with the fast solvers for higher order edge finite element discretizations of Maxwell's equations.We present the preconditioners for the first family and second family of higher order N′ed′elec element equations,respectively.By combining the stable decompositions of two kinds of edge finite element spaces with the abstract theory of auxiliary space preconditioning,we prove that the corresponding condition numbers of our preconditioners are uniformly bounded on quasi-uniform grids.We also present some numerical experiments to demonstrate the theoretical results. | ZHONG LiuQiang1,2,SHU Shi1,2,SUN DuDu3&TAN Lin4 1School of Mathematical and Computational Sciences,Xiangtan University,Xiangtan 411105,China 2Hunan Key Laboratory for Computation and Simulation in Science and Engineering,Xiangtan 411105,China 3Institute of Computational Mathematics and Scientific/Engineering Computing,Academy of Mathematicsand Systems Science,Graduate University of Chinese Academy of Sciences,Chinese Academy Sciences,P.O.Box 2719,Beijing 100190,China 4Department of Math-Physics,Nanhua University,Hengyang 421001,China | 2008 | Science China Mathematics2008，51，8： | 3 |
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