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Journal of East China Normal University(Natural Science) 2010 Vol.2010 Please wait a minute... For Selected: Download Citations EndNote Reference Manager ProCite BibTeX RefWorks Toggle Thumbnails Select Non-linear second-order singularly perturbed problem with integral boundary condition (Chinese) XIE Feng;ZHANG Lian Journal of East China Normal University(Natural Sc    2010, 2010 (1): 1-5.   Abstract （3154）      PDF （212KB）（1368）       Knowledge map    By the method of boundary layer function the formal asymptotic solution for the problem was constructed, and its uniformly validity was proved using the theory of differential inequalities. An example was given. Related Articles | Metrics Select Laplacian spread of bicyclic graphs (Chinese) LI Ping;SHI Jin-song;LI Rui-lin Journal of East China Normal University(Natural Sc    2010, 2010 (1): 6-9.   Abstract （2987）      PDF （240KB）（1588）       Knowledge map    The Laplacian spread of a graph is defined to be the difference between the largest and the second-smallest Laplacian eigenvalues of the graph. Using properties of polynomial, we characterized the graphs with the maximal Laplacian spread among all bicyclic graphs. Related Articles | Metrics Select Some results on the Laplacian energy of a graph LIU Ying;WU Bao-feng Journal of East China Normal University(Natural Sc    2010, 2010 (1): 10-16.   Abstract （3158）      PDF （162KB）（1787）       Knowledge map    This paper studied the relation between the Lapacian energy with the singular values of the Laplacian matrix and obtain some results on the bound of the Laplacian energy on a graph. Changes of the energy caused by deletion of edges and vertices of a graph were also studied. The results may help to have a better understanding of pi-electron energy in a molecule in theoretical chemistry. Related Articles | Metrics Select Zero-truncated generalized Poisson regression model and its score tests ZHAO Wei-hua;FENG Yu;LI Ze-an Journal of East China Normal University(Natural Sc    2010, 2010 (1): 17-23.   Abstract （3072）      PDF （229KB）（2297）       Knowledge map    This paper extended the ZTP regression model to Zero-truncated generalized Poisson regression model. An algorithm for estimating parameters was obtained and two score tests were presented for testing the ZTP regression model against the ZTGP regression model, and for testing the significance of regression coefficients. A numerical example was given to illustrate our method and the power of score tests was investigated by Monte Carlo simulation. Related Articles | Metrics Select Computer automated derivation of conservation laws for nonlinear differential-difference equations (Chinese) ZHU Jiao-feng;LIU Yin-ping Journal of East China Normal University(Natural Sc    2010, 2010 (1): 24-33.   Abstract （2593）      PDF （339KB）（1435）       Knowledge map    Based on Wu’s elimination method and “divide-and-conquer” strategy, the undetermined coefficient method for constructing polynomial conservation laws of nonlinear differential-difference equations was improved. Furthermore, a Maple package CLawDDEs was developed to automatically derive conserved densities and associated fluxes of polynomial differential-difference equations. For parameterized nonlinear differential-difference equations, CLawDDEs can also filter out the compatibility conditions which admit the existence of infinitely conservation laws. So CLawDDEs can be used as an effective tool to test the integrability of nonlinear differential-difference equations. Related Articles | Metrics Select New modified limited memory quasi-Newton method (Chinese) LU Hui-fang;YANG Yue-ting Journal of East China Normal University(Natural Sc    2010, 2010 (1): 34-38.   Abstract （3044）      PDF （267KB）（1572）       Knowledge map    Based on modified quasi-Newton equation, a new limited memory quasi-Newton method with two-loop recursion was proposed. Comparing to the classical limited memory BFGS method, the new method uses more function value and gradient informations to construct the quasi-Newton update mectrix, and does not need more computational efforts. The theory analysis and numerical results show the efficiency of the proposed method. Related Articles | Metrics Select On a matrix equality and its supplemental proof YAMAMOTO Yusaku;LIN Ming-hua; Journal of East China Normal University(Natural Sc    2010, 2010 (1): 39-43.   Abstract （2983）      PDF （254KB）（1428）       Knowledge map    In this paper, A problem about an equality of the generalized inverses of matrices, proposed by CHEN Xiao-juan and GUO Wen-bin, was solved. In the end, a simpler supplemental proof was also given. Related Articles | Metrics Select Global convergence of a new conjugate gradient method for modified Liu-Storey formula CAO Wei;WANG Kai-rong Journal of East China Normal University(Natural Sc    2010, 2010 (1): 44-51.   Abstract （2908）      PDF （195KB）（1587）       Knowledge map    In this paper, a modified conjugate gradient formula beta _k^MLSbased on the formula of the Liu-Storey(LS) nonlinear conjugate gradient method was proposed. It was proved that under the Wolfe-Powell line search and even under the strong Wolfe-Powell line search, with parameter sigma in bigg(0,frac12bigg), the new method has sufficient descent and global convergence properties. Preliminary numerical results show that the method is very promising. Related Articles | Metrics Select Controlling and synchronization of a new Lorenz-like chaotic system ZHANG Qing;SHU Yong-lu;ZHANG Wan-xin Journal of East China Normal University(Natural Sc    2010, 2010 (1): 52-61.   Abstract （2605）      PDF （390KB）（1995）       Knowledge map    By using the backstepping design method we formulated a simple controller to control the system to its unstable equilibrium (0,0,0), any point of the form (0,0,1+b+p(1-p))(0<p<1) in phase space, and forced the first state variable to trace arbitrary given function r(t). Suppose one parameter was unknown, we proposed a unidirectional coupled scheme and a parameter update role to assure the new Lorenz-like system to globally synchronize with a copy of itself. We presented a rigorous proof of our design by constructing proper Lyapunov function. Numerical simulations using Matlab were presented to show the feasibility of our design. Related Articles | Metrics Select Globally attractive set and feedback synchronization of the BLDCM system SHU Yong-lu;ZHANG Yong Journal of East China Normal University(Natural Sc    2010, 2010 (1): 62-68，7.   Abstract （2632）      PDF （213KB）（1399）       Knowledge map    The globally exponentially attractive set and synchronization problem of the brushless dc motor (BLDCM) chaotic system were researched. Firstly, based on the definition of globally exponentially attractive set and Lyapunov stability theory, a sufficient condition for the globally exponentially attractive was given. Secondly, nonlinear feedback control was used to realize the synchronization of two chaotic systems. Finally, numerical simulations were presented to show the effectiveness of the proposed chaos synchronization scheme. Related Articles | Metrics Select Performance analysis in call centers with IVR and impatient customers (Chinese) ZHANG Hua-qing Journal of East China Normal University(Natural Sc    2010, 2010 (1): 69-78.   Abstract （2443）      PDF （412KB）（1441）       Knowledge map    The paper considered a call center with interacting voice response (IVR) by using Markov model. By constructing a two-state and a three-state MC, stationary probability was given using flow conservation equation and Q-matrix respectively. Furthermore, other performance indexes was deduced, too. Related Articles | Metrics Select Licensing in Stackelberg markets under asymmetric information of technology value LI Juan-bo Journal of East China Normal University(Natural Sc    2010, 2010 (1): 79-84.   Abstract （2412）      PDF （160KB）（1280）       Knowledge map    This paper proposed a model to analyze the licensing schemes when the patentee had private information about its technology value. In this model, the patentee was considered as an insider in Homogenous Stackelberg Market instead of an independent R&D institute. Based on this model, this paper presented the patentee’s optimal licensing option for maximizing its profit under the condition that the licensee may accept the contract. In the same way, this paper analyzed the fixed fee, royalty and the profit of the patentee in the model, respectively. This paper aims at proposing an idea for the participants to advance the efficiency of licensing. Related Articles | Metrics Select Generalized Beta and F distributions of quaternion matrix argument (Chinese) LI Fei;XUE Yi-feng Journal of East China Normal University(Natural Sc    2010, 2010 (1): 85-90.   Abstract （2856）      PDF （226KB）（1323）       Knowledge map    This paper computed the Jacobian of transformation textbfemphX=textbfemphBYB^mathrm T of singular quaternion matrices by using of the singular value decomposition of quaternion matrix and the density function of singular quaternion Wishart matrix. Then we defined the Beta and F distributions of quaternion matrix argument,and gave the density functions of the Beta and F distribution and the joint density functions of the nonzero eigenvalues of the singular quaternion matrices which satisfy the Beta or F distribution. Related Articles | Metrics Select Sharp estimate of the p-Laplace operator WANG Lin-feng Journal of East China Normal University(Natural Sc    2010, 2010 (1): 91-98.   Abstract （3087）      PDF （245KB）（1361）       Knowledge map    Let M be an n-dimensional complete noncompact Riemannian manifold with metric g, triangle_p(1<pleqslant 2) the p-Laplace operator, by using the classical method of Li-Yau, a gradient estimate of the positive solution to equation triangle_pu=-lambda |u|^p-2u was proved under suitable curvature condition, in which lambdageqslant 0 is a constant; the upper bound estimate of lambda was a byproduct; one also showed that this estimate is sharp. This result generalizes the gradient estimate of the positive solution to elliptic equation triangle u=-lambda u. Related Articles | Metrics Select Some equivalent conditions of commutativity of a textbfC^*-algebra (Chinese) JIANG Run-liang;XUE Yi-feng Journal of East China Normal University(Natural Sc    2010, 2010 (1): 99-102.   Abstract （2790）      PDF （216KB）（1289）       Knowledge map    Let Abe a mathrm C^*-algebra. If A is Abelian, then each hereditary mathrm C^*-subalgebra (or one-sided closed ideal) of A is a closed ideal in A. Conversely, in terms of the correspondence between the pure state and the maximal left idea, we get that if each hereditary mathrm C^*-subalgebra (or one-sided closed ideal) of A is a closed ideal in A, then A must be Abelian. So in a noncommutative mathrm C^*-algebra, there must exist a hereditarymathrm C^*-subalgebra which is not a closed ideal. Using the main result, we also obtain a simple criterion to check if a given mathrm C^*-algebra A is Abelian, that is, A is Abelian if and only for any two positive elements a, bin A, there is a’in A such that ab=ba’. Related Articles | Metrics Select Comparison of positive elements in C*-algebras (Chinese) ZHANG Yi-fan;HU Shan-wen Journal of East China Normal University(Natural Sc    2010, 2010 (1): 103-107.   Abstract （2538）      PDF （226KB）（1380）       Knowledge map    In this paper, we discussed a kind of comparison theory introduced by Lin Huaxin. We first used operator theory to discuss hiding information in the original definition and then obtain an equivalent definition of this comparison theory. Also, some useful properties and results are presented. In addition, we gave an interesting property about projections that it does not have and a characterization of simple C*-algebras. Related Articles | Metrics Select On weak emphc-supplement and formations (Chinese) LIU Xiao-lei Journal of East China Normal University(Natural Sc    2010, 2010 (1): 108-110.   Abstract （2484）      PDF （173KB）（1255）       Knowledge map    By weak c-supplement we investigated the possibility that a finite group is in a saturated formation containing all supersoluble groups. It was showed that for a saturated formation mathcalF containing all supersoluble groups, if there exists a group G such that G contins a normal subgroup N and G/N is supersoluble and if maximal subgroups of Sylow subgroups of N are c-supplemented in G, then Gin mathcalF. Some results are extended. Related Articles | Metrics Select Global trust model with high white washing resistance (Chinese) JIANG Xue;ZHENG Jun;WANG Ping Journal of East China Normal University(Natural Sc    2010, 2010 (1): 111-117.   Abstract （2740）      PDF （1001KB）（1597）       Knowledge map    Based on an analysis of the characteristics of P2P network and related security issues, this paper proposed a global trust model which has a high resistance to malicious acts and free riders. Specifically, if the malicious nodes or free riders try to reregister into the system to white wash their low credibility and trust, the model can quickly trace and isolate them, showing high white washing resistance. The results of simulation showed that this model can easily isolate malicious behaviors, especially has high resistance to white washing. Related Articles | Metrics Select Security authentication protocol based on bilinear pairing (Chinese) HUANG Su-shan;QIAN Hai-feng;ZHOU Yuan Journal of East China Normal University(Natural Sc    2010, 2010 (1): 118-126.   Abstract （2872）      PDF （541KB）（1774）       Knowledge map    A scalable authentication protocol based on bilinear paring was proposed. There are several advantages of the new protocol: (1) By using the bilinear group, the length of public parameter and keys decreases with the same security level, hence we reduce bandwidth needed in communication, thus the protocol is more suitable for the huge internet system. (2) It incorporates a 3-factor authentication mechanism for detecting compromise. (3) The password can be canceled by user’s requirement. (4) The protocol has great efficiency and scalable implement. Related Articles | Metrics Select Ant colony optimization algorithm for computing resource allocation based on cloud computing environment (Chinese) HUA Xia-yu;ZHENG Jun;HU Wen-xin Journal of East China Normal University(Natural Sc    2010, 2010 (1): 127-134.   Abstract （4942）      PDF （1353KB）（6480）       Knowledge map    A new allocation algorithm based on Ant Colony Optimization (ACO) was established to satisfy the property of cloud computing. When start, this algorithm first prognosticated the capability of the potential available resource nodes, then analyzed some factors such as network qualities or response times to acquire a set of optimal compute resources. This algorithm met the needs of cloud computing more than others for grid environment with shorter response time and better performance, which were proved by the simulation results in the Gridsim environment. Related Articles | Metrics Select Single integral equation for electromagnetic scattering by given dielectric objects (Chinese) LI Ke-zhou;QIN Yi;JIANG Hong;ZHU Shou-zheng Journal of East China Normal University(Natural Sc    2010, 2010 (1): 135-141.   Abstract （2405）      PDF （637KB）（1786）       Knowledge map    In order to simplify the computation complexity for traditional single integral equation in electromagnetic scattering from dielectric objects, a new single integral equation was proposed. The numerical results of RCS (radar cross section) obtained from several dielectric objects with large permittivity are in agreement with the exact results. Furthermore, the calculation amount is reduced apparently and the singularity of the integral core is weakened. The validity of the new single integral equation was also discussed. Related Articles | Metrics Select Study on reserve site selection by simulated annealing algorithm: An example from the Great Blue Mountain World Heritage Area ZHANG Kun;XU Shi yuan;WANG Jun Journal of East China Normal University(Natural Sc    2010, 2010 (2): 1-8.   Abstract （2821）      PDF （1793KB）（2343）       Knowledge map    The reserve siteselection problem is how to minimize the cost of the reserve system while satisfying certain conservation goals. To solve this problem, simulated annealing algorithm is widely used. Take the Great Blue Mountain World Heritage Area (GBMWHA) as an example, this paper studied the distribution of myrtacea in the 100 kilometers buffer area of GBMWHA. The aim is focused on the compactness of the reserve system. We experimented variety parameters of the objective function，namely the boundary length modifier (BLM). The results show that, a more compact portfolio could be achieved at the expense of larger area. But the compact system has shorter boundary, thus is easier to manage. Related Articles | Metrics Select Analysis of system characteristics and vulnerability of rainstorm hazards in Shanghai LU Min;LIU Min;QUAN Rui song;ZHANG Li jia;WANG Jing jing Journal of East China Normal University(Natural Sc    2010, 2010 (2): 9-15.   Abstract （3140）      PDF （1444KB）（2432）       Knowledge map    Based on nearly 30 years rainstorm data, this paper did dynamic research on the exposure, vulnerability of the Shanghai urban system under the impact of rainstorms. Under the rainstorm environment, the evolution process characteristic of the system was also studied. The result showed that the amount and the intensity of rainstorm indicate a significantly increasing tendency in recent 30 years; the rainstorm increased the hazard of urban waterlogging. While the impact of urban flood disaster caused by low intensity rainstorm is slight, extreme rainstorms still bring great threat to the city. In urban construction and development process, social system change, such as the design and the improvement of drainage capacity, rebuilding of old district and the improvement of housing standards, reduced urban waterlogging hazards and vulnerabilities. However, with the development of the urban area, new weak and hazardous regions emerge, thus it is necessary to contnue doing dynamic analysis on the disaster vulnerability of the system. Related Articles | Metrics Select Dynamic evaluation of land use intensity in Taian city YANG Jiong;WANG Wei Journal of East China Normal University(Natural Sc    2010, 2010 (2): 16-25.   Abstract （2718）      PDF （988KB）（1659）       Knowledge map    An evaluation index system for the central area land in Taian city Shandong province was built, including three layers (Target, Criteria and Element Layers) and 11 indices (the investment in fixed assets, road paving, total employees, all government revenue, the total turnover of all consumer goods, GDP, per capita GDP, urban land use area per capita, per capita living space, green coverage, per capita public green land of a certain area). The integrated score of three different periods of land intensive use in 1990, 2000 and 2007 was calculated, using a multifactor comprehensive evaluation model. The results showed that the intensive utilization of builtup areas land was increased in Taian. Some factors, such as investment in fixed assets, all government revenue, GDP, per capita GDP and per capita public green land, condributed significantly to the improvement of intensive utilization of land, while other factors, such as all road paving, employees, green coverage in a certain area, have not so significant contributions. Related Articles | Metrics Select Spring avian community characteristics in Fuling and its ecological perspective for regional reserve WU Shao bin;FANG Ping;HAN Zong xian;LUO Zhu kui;LI Hong qun;ZHANG Yan;WU Sha Journal of East China Normal University(Natural Sc    2010, 2010 (2): 26-33.   Abstract （2831）      PDF （1201KB）（1597）       Knowledge map    By the method of line transect, a bird survey was conducted in Fuling, Chongqing China, in the springs during 20062008. According to the habitat characteristics, the avian communities were classified into four catalogues: water area community, secondary forest community, residential area community, and farmland community. A total of 96 bird species was recorded, including 4 species with important values from 200 to 300 and 38 widely distributed ones. The secondary forest habitat has the highest species richness and index of ShannonWiener. Avian communities in the water area, water areafarmland, and forestresidential area have the highest Pielou index, Jaccard index, and Cosine index, respectively. Impacts affecting birds in Fuling arise mainly from the irrational agriculture configure and industrial pollution. The study suggested that Natural Forest Protection Projects should be advocated and practiced. Related Articles | Metrics Select Change characteristics of major ions and their influence factors in Yangtze Estuary in recent years LI Dan;DENG Bing;ZHANG Guosen;ZHANG Yingying Journal of East China Normal University(Natural Sc    2010, 2010 (2): 34-42.   Abstract （2960）      PDF （2092KB）（2251）       Knowledge map    The geochemistry of major ions(Ca2+，Mg2+，Na+，K+，HCO32- ，SO42-，Cl-，NO3-和SiO32-)in the Yangtze River was studied, based on the monthly monitoring data at Xuliujing station for the period of 2004-2008 and the investigation result of the Yangtze River in September 2008. The study found that the concentration of main ions varies clearly in different seasons, with a negative correlation with the discharge of the River. But the difference of the concentration is less clearly than that of the discharge. There is a persistently increasing in the concentrations of K+, Na+, Ca2+, Mg2+, Cl-, NO3-, SO42-and the ratio of hardness/alkalinity; especially the concentration of SO42-and the ratio of hardness/alkalinity have a more obvious increasing trend. In contrast, the concentration of SiO32-and HCO3-show a decreasing trend. The changes of major ions mainly result from the environment acidification, the pollution emissions by human, the cyclic salt from sea, the preserved effect by reservoirs establishments etc. Related Articles | Metrics Select Effects of application rates of N,P fertilizer on yield and nitrate accumulation in lettuce ZHANG Jun guo;DA Liang jun;ZHANG Cai xian;NIAN Yao ping;XIA Ti yuan; Journal of East China Normal University(Natural Sc    2010, 2010 (2): 43-49.   Abstract （3311）      PDF （1058KB）（2396）       Knowledge map    An experiment was carried out on field to investigate the relationship between the yield, nitrate accumulation and N，P fertilization level in lettuce. The yield of lettuce increased 32.4%, when the rates of N and P were reduced to 46.4% of that in high fertilizer groups. N and P, applied in proper combinations, are important factors for high yield of lettuce. The optimal level of nitrogen for high lettuce yield was 180～270 kg·hm-2,and that of phosphorus was 125～190 kg·hm-2. The content of nitrate in lettuce increased with the increasing of nitrogen levels of fertilizers. Appropriate phosphorus levels could restrain nitrate accumulation of lettuce. Proper N，P combinations could improve the quality of lettuce and increase yield. Related Articles | Metrics Select Study on the relationship between water quality improvement and Nymphaea tetragona physiological diurnal variation in purification tanks ZHAO Feng;LU Xiao ming;HUANG Min sheng;CHEN Jian jun Journal of East China Normal University(Natural Sc    2010, 2010 (2): 50-57.   Abstract （2606）      PDF （2063KB）（2230）       Knowledge map    With the nonaeration(Ⅰ) and aeration(Ⅱ) conditions of two aquatic plant purifyingtanks, the changes of plant physiological traits including the activities of POD, CAT, and the contents of SP, Chla,and the main physical water quality in a day at different times, were observed. Correlation between diurnal variation of plant physiological traits and removal efficiencies of CODCr,NH4+-N,TP were analyzed, and the effect of aeration to plant physiological traits and the purifying effect were studied. The results showed that the plant physiology and the water quality index were affected by the light intensity changes to some extent. The physiological traits of 〖WTBX〗Nymphaea tetragona〖WTBZ〗 had positive correlations with the removal efficiencies of CODCr,NH4+-N, TP. Aeration affected the activities of POD, CAT and the contents of SP, Chla significantly; the water quality of two conditions of purification tanks were affected by the variation of light intensity. The content of DO and the removal efficiencies of CODCr,NH4+-N, TP in the conditionⅡexceeded the conditionⅠby 2.54 mg/L, 21.0%, 16.6% and 14.1%, respectively. Related Articles | Metrics Select Screening thyroid hormone disrupting effects of cadmium using Xenopus metamorphosis assay QIAN Li juan;GUO Su zhen;CAO Qing zhen;LIU Jun qi;SHI Hua hong Journal of East China Normal University(Natural Sc    2010, 2010 (2): 58-66.   Abstract （2724）      PDF （2191KB）（1751）       Knowledge map    Xenopus laevis tadpoles (NF51) were exposed to cadmium chloride at the concentrations of 0.01, 0.1and 1 mg·L-1Cd2+ for 21 days. The changes of growth, metamorphosis and thyroid gland of X. laevis were observed. Compared with the control, the body weight (BW), snout to vent length (SVL) and hind limb length (HLL) were decreased by 0.39, 0.17 and 0.27 fold in 1 mg·L-1Cd2+treatment group after exposure for 7 days, respectively. The hind limb length (HLL) was decreased by 0.11 fold and the development showed one stage slower in 1 mg·L-1 treatment group after exposure for 21 days. And the other treatment groups did not show significant changes in BW, SVL, HLL or development stages after exposure for 7 and 21 days. Cadmium chloride treatment decreased the number of follicle, and induced the depletion of colloid and even vacuolation after exposure for 21 days. In addition, amalgamation of two or more follicles occurred in 1 mg·L-1 treatment group. Our results suggested that cadmium chloride had thyroid hormone disrupting effects and might disturb thyroid gland tissue directly. Therefore, AMA was further proved to be a valid tool to screen the thyroid hormone disrupting effect of heavy metal salt. Related Articles | Metrics Select Morphological study on embryonic development of the parthenogenetic egg in Daphnia carinata QIN Fen;LI Qiang;XU Xiaoqian;ZENG Cuo;ZHAO Yunlong Journal of East China Normal University(Natural Sc    2010, 2010 (2): 67-76.   Abstract （3322）      PDF （2908KB）（1589）       Knowledge map    The parthenogenetic egg (PE) is centrolecithal and its embryogenesis lasts about 45 hours at 24 ℃. According to the morphological and histological changes, the embryonic development of D. carinata could be divided into seven major stages, i.e. the cleavage stage, blastula stage, gastrula stage, eggnauplius stage, eggmetanauplius stage, embryo with eye pigments, and preparehatchling stage. The superficial cleavage of PE did not happen until approximately 40 minutes after egg laying. At the end of cleavage, the embryo consisted of 256 cells and reached the blastula stage at which a large part of the blastocoele was filled with yolk granules, accompanying by the formation of a thin sheet of divided cells. The cell division rate was accelerated and gastrulation took place by means of immigration of blastodermal cells at the end of this stage. Afterwards, the morphological changes in embryo development became remarkable. The eggnauplius stage was characterized by the appearance of the rudiments of two antennae and a mandible in the head region of the embryo, while the eggmetanauplius stage characterized by the formation of the thoracic segments, thoracic limbs, carpace, and guts. At the eye pigments stage, the embryo was found presenting the eye pigmentation in the welldeveloped compound eyes. Simultaneously, other physiologically important tissues and organs started to develop. During the last preparehatching stage, the organelle structure in the embryo could be quite similar to that in the larval. The results could accumulate basic biological information for further research on embryonic development of Cladocera. Related Articles | Metrics Select Experimental study on the hypoglycemic action and prevention of diabetic complication with Pueraria flavonoids ZHANG Zaicao;YE Xiyun;XU Minhua;WANG Yaofa Journal of East China Normal University(Natural Sc    2010, 2010 (2): 77-81.   Abstract （2861）      PDF （912KB）（2302）       Knowledge map    An animal model of diabetes was established with alloxan tail vein injection (50 mg/kg), in order to research the effects of Pueraria flavonoids on blood glucose level and the prevention of diabetes and its complication. The mice were randomly divided into 4 groups: normal group, diabetic group, Tang Mai Kang control group and Pueraria flavonoids group. After 40 days, the weight, water intake, blood glucose, sugar tolerance, fructosamine, Dglucitol, aldose reductase, SDH and advanced glycation end products(AGEs) of the mice were detected. Compared with the diabetic group, the blood glucose〖JP2〗 level of the mice treated with Pueraria flavonoids was decreased markedly, while the content of SDH in the blood was increased significantly. The contents of fructosamine, Dglucitol, aldose reductase and AGEs in the blood were reduced obviously. Moreover, the contents of AGEs and Dglucitol in 〖JP〗the liver, kidney, cerebrum, heart and skin were also decreased (all P＜0.01).Our results demonstrate that Pueraria flavonoids are effective not only in lowering blood glucose level but also in the prevention or treatment diabetesinduced complication. Related Articles | Metrics Select Comparison on relationships between characters and invasiveness in different weed groups in Jiangsu, Zhejiang and Shanghai, China LI Ming li;GUO Shui liang;YIN Li ping;CHEN Guo qi Journal of East China Normal University(Natural Sc    2010, 2010 (2): 82-91.   Abstract （3103）      PDF （1352KB）（1717）       Knowledge map    Based on investigations and previous documents, 647 weed species in Jiangsu, Zhejiang and Shanghai, China, were confirmed. Their 32 botanical and ecological characters, which include invasiveness, type of life cycle, seed or fruit size and production, breeding system etc., were collected. 647 weed species were quantitatively divided into 11 groups using the method of cluster analysis. The relationships of their invasiveness with other 31 characters were analyzed employing the GLM and correlate procedure of SPSS 13.0. The results showed that, when the 647 species were regarded as a whole, the species with the characters such as taproot or tuberous roots, unisexual flowers, big seeds (or fruits), zygomorphic flowers, perennial type, mesic or shade habitats are often of lower invasiveness, while those with much seeds (or fruits), growing in the sunny or hygrocolous habitats are probably of higher invasiveness. However, if the weeds of different groups were analyzed separately, the relationships between invasiveness and characters vary with different weed groups. That is, a character, which correlates closely with invasiveness in one weed group, probably does not in other groups. Therefore, it may not reasonble to find a universal index system to evaluate invasiveness of all alien plants in a given area. Related Articles | Metrics Select Effects of extensive oxidative stress on the interaction between the skeletal type ryanodine receptors and related proteins ZHANG Yu kun;CAI Zhi yin;ZHU Qian rong;CAO Mei ping;XIA Ruo hong Journal of East China Normal University(Natural Sc    2010, 2010 (2): 92-101.   Abstract （2778）      PDF （1376KB）（1720）       Knowledge map    By using [3H]-ryanodine binding assay, SDS-PAGE, Western Blotting, photon correlation spectroscopy (PCS) and DPH fluorescence polarization, the influences of oxidation modulators 1,4NQ and Na2SeO3 on the channel activity, the average particle size of RyR1, the distribution of SR proteins in crosslinking complex, and fluidity of SR membrane under the oxidative stress were investigated. The results indicate that, upon to the oxidants treatment of 1,4NQ and Na2SeO3, both the activity of RyR1 channel and the fluidity of SR membrane decreased, and macromolecular crosslinked complexes consisting of RyR1 emerged on the gel of the SR membrane proteins. Further investigations showed that DTT decomposed the crosslinked complexes. Above results suggest that the inhibition of RyR1 channel caused by the high concentration of oxidant modulators is probably due to oxidation of the functional sulfhydryls which are responsible for the closure of the channels, and the occurrence of mistaken crosslinking between SR proteins which would alter the function of the calcium release unit. Related Articles | Metrics Select In vitro study of the effect of silver nanoparticles on the adhesion and membrane function of cells YU Wen juan;WANG Xiang hui;SHI Qin;HUANG Rui Journal of East China Normal University(Natural Sc    2010, 2010 (2): 102-110.   Abstract （2595）      PDF （2978KB）（1771）       Knowledge map    In this paper, the acute cytotoxicity of silver nanoparticles, as well as their influence on the adhesion state and membrane functions of Human Umbilical Vein Endothelial Cells ( HUVEC) and Human Umbilical Artery Smooth Musle Cells (HUASMC) were studied in vitro, for the sake of clinic using security. The results are as follows. Silver nanoparticles whose concentration ranged from 0.0039 mg/mL to 0.5 mg/mL did not show acute cytotoxicity within 8 hours, but the effects on the adhesion state of both cell lines were observed. The shape of the cells abnormally became small and round, which indicated that they were not well adhered on the culture plate. At the mean time, silver nanoparticles were found aggregating on the cell membrane, and the membrane fluidity and integrity of the cells were alternated, which implied that Ag nanoparticles had cytotoxicity in a certain degree. Related Articles | Metrics Select Forebrain overexpression of αCaMKII disrupts behavioral flexibility AN Shu ming;ZENG Qing wen;XU Hao;LIU Ru qing;CAO Xiao hua Journal of East China Normal University(Natural Sc    2010, 2010 (2): 111-118.   Abstract （3091）      PDF （2144KB）（1506）       Knowledge map    The αCaMKIIF89G transgenic mice and their littermate controls were subjected to the rotarod test and Morris water maze test. There was no significant difference in motor coordination and ability between these two groups in the rotarod test. In the visible platform test, transgenic mice showed the normal perception, motivation and motor ability. In addition, transgenic mice performed normally in learning and memory in both place navigation training and the 1st spatial probe test. However, compared with wild type mice, transgenic mice spent significantly more time and swam longer distance to reach hidden platform in the 2nd and 3rd day of spatial reversal learning. These results indicate that αCaMKII overexpression in the forebrain can impair spatial reversal learning. The mechanism of the performance deficit may be relevant to disrupted or abolished LTD in the forebrain. Related Articles | Metrics Select Study of βCaMKII on working memory in protein modified transgenic mice YIN Liang;ZENG Qing wen;DU Dan;CAO Xiao hua Journal of East China Normal University(Natural Sc    2010, 2010 (2): 119-126.   Abstract （2431）      PDF （1221KB）（1633）       Knowledge map    This experiment was designed to investigate the effect of the βCa2+/calmodulin dependent protein kinases II(βCaMKII) on the working memory in mice. The result of Western Blot showed that βCaMKII was overexpressed in the prefrontal cortex in transgenic mice. There was no significance in escape latency between transgenic mice and controls in Morris water maze. In addition, the correct of transgenic mice in T maze was also similar to that of controls. These results suppose that overexpression of the βCaMKII has no significant effect on the prefrontal cortex dependent working memory in mice. Related Articles | Metrics Select Synthesis and evaluation of silica monoliths REN Hu bo;LIU Ren min Journal of East China Normal University(Natural Sc    2010, 2010 (2): 127-133.   Abstract （2612）      PDF （2122KB）（1504）       Knowledge map    In this paper, a silica monolith was prepared as the promising candidate for HPLC separations. Characterization of prepared silica monolith was performed with scanning electron microscopy and surface area machine. Its chromatographic properties were evaluated by using toluene and phenol as samples while nhexane as the mobile phase. Permeability and column pressure drop were evaluated for separation, and the possible separation mechanism was also investigated in the paper. The results showed that the silica monolith had characters of high permeability, high mechanical strength, good chemical stability and strong absorption capability. Related Articles | Metrics Select Isolation and identification of a strain of Streptomyces with antimicrobial activity WANG Xue jun;MIN Chang li;CHEN Dai jie Journal of East China Normal University(Natural Sc    2010, 2010 (2): 134-140.   Abstract （2620）      PDF （2122KB）（1518）       Knowledge map    A strain HCCB10124 was isolated from the soil against pathogenic fungus Verticillium dahliae.The growth of 10 plant pathogens and some bacteria were strongly inhibitded by strain HCCB10124 on PDA plate, but unconspicuous effects on bacteria comparatively. The morphology, cultural characteristics,physiological and biochemical properties ,chemotaxonomy and 16S rDNA sequences of this strain were studied. The results exhibited that the homology of 16S rDNA between Streptomyces strain HCCB10124 and Streptomyces albireticuli reached 99%. A phylogenetic tree was constructed by comparing with the published 16S rDNA sequences of the related species. According to the multiclassification principle and the phylogenetic analysis, the Streptomyces strain HCCB10124 should be nomenclatured as Streptomyces albireticuli. Related Articles | Metrics Select Experimental ecology research on destroyed evergreen broad leaved forests in TNFP, Zhejiang (Ⅳ): Contribution of seed bank to early restoration of destroyed evergreen broad leaved forests SONG Yaobin;ZHANG Qiping;DA Liangjun; Journal of East China Normal University(Natural Sc    2010, 2010 (3): 1-9.   Abstract （2534）      PDF （1135KB）（2325）       Knowledge map    Four destroyed evergreen broadleaved forest plots were established by simulating the common disturbance types (removing trees, H>8 m; removing trees, H<8 m; removing all above ground plant; removing all aboveground plant and 010 cm depth surface soil) in Tiantong National Forest Park, in October, 2003. For understanding the contribution of seed bank to the restoration of destroyed evergreen broad leaved forests, the seed germination pattern, species composition, and the similarity between seed bank and the seedlings composition of first year restoration have been studied in this paper. The results showed that there were 995 seeds in seed bank and the seed abundance was 248.75 m-2, which belonged to 28 species, 27 genera and 21 families. The role of seed bank to 4 plots were Ⅰ (0.467) >Ⅳ (0.389) >Ⅱ (0.368) >Ⅲ (0). The pioneer species Sassafras tzumu , Alniphyllum fortunei , Clerodendrum cyrtophyllum , Litsea cubeba germinated and recruited abundantly from seed bank while the climax species Castanopsis carlesii and Lithocarpus glaber had little role to vegetation restoration. The species Choerospondias axillaries and Cinnamomum camphora mainly regenerated from exotic seed source. Conclusively, the soil seed bank exerted little role to the restoration of the evergreen broadleaved forests in this area. Related Articles | Metrics Select Experimental ecology research on destroyed evergreen broad leaved forests in TNFP, Zhejiang (V): Five year recovery and regeneration of main trees after different disturbances QI Yu-feng;YANG Xu-feng;ZHANG Qi-ping;SONG Kun;KANG Min-ming;DA Liang-jun; Journal of East China Normal University(Natural Sc    2010, 2010 (3): 10-25.   Abstract （3367）      PDF （1595KB）（1670）       Knowledge map    Investigations were carried out for 5 years from October, 2003 to October, 2008 in a logged evergreen broad leaved forest at Tiantong, Zhejiang province. Five following treatments were used in five sites: (Ⅰ) Big trees with height>8 m and DBH>5 cm were removed but sprouts retained; (Ⅱ) ground surface vegetation was removed but litter retained; (Ⅲ) all vegetation and 0 10 cm topsoil were removed. (Ⅳ) undergrowth was removed but big trees retained; and (Ⅴ) a control plot without any disturbance. Our results showed that: (1) The highest BAs (basal area value) were found in plot Ⅰ and plot Ⅱ, with a value of 1 631.8 cm2 and 1 619.4 cm2 respectively, and the lowest in plot Ⅳ with a value of 43.4 cm2. (2) The increase of BA in plot Ⅰ was mainly from the growth of retained evergreen broad leaved trees; plot Ⅱ had the highest BA increase which was mainly from deciduous broad leaved shrubs or small trees and deciduous broad leaved trees, and plot Ⅲ mainly from deciduous broad leaved shrubs or small trees and evergreen broad leaved trees; plot Ⅳ had few trees with low BAs. (3) Seedling and sapling recruitment fluctuated in all plots in 5 years. In plot Ⅰ and plot Ⅱ, seedlings and saplings were mainly evergreen broad leaved trees, but plot Ⅱ had more deciduous trees; seedlings and saplings in plot Ⅲ were mainly deciduous trees while in plot Ⅳ mainly evergreen broad leaved trees. Our results indicate that logging impact the recovery and regeneration of the evergreen broad leaved forest trees. Under logging big trees, evergreen broad leaved trees recover quickly; under clearing undergrowth, main trees recover slowly; under two kinds of clear cuttings, deciduous trees invade and dominate the plots or are mixed with evergreen broad leaved trees. Related Articles | Metrics Select Experimental ecology research on destroyed evergreen broad leaved forests in TNFP, Zhejiang (Ⅵ): Leaf traits and ecological adaptation of five main dominant species during the early stage of restoration after different disturbances KANG Min-ming;ZHANG Qi-ping;DU Jing;SHEN Chen-chen;DA Liang-jun; Journal of East China Normal University(Natural Sc    2010, 2010 (3): 26-38.   Abstract （3398）      PDF （1932KB）（2178）       Knowledge map    The maximum of net photosynthesis based on area (Amax), specific leaf area (SLA), and leaf nitrogen and phosphor concentration (N, P) of 5 main dominant species under 4 different degradation plots (removing trees, H>8 m; removing trees, H<8 m; removing all aboveground plant; removing all aboveground plant and 010 cm depth surface soil) were studied in Tiantong National Forest Park, Zhejiang province, China. The main results as follows. (1) Amax increased and SLA decreased along disturbance levels. (2) The low content of soil available P in plot Ⅲ (removing all aboveground plant and 010 cm depth surface soil) caused the significant declining of leaf P concentration. (3) Different main woody species owned different ecological adaptation to disturbance. Deciduous Litsea cubeba grew fast and dominated at the early stage of restoration with higher Amax, SLA, leaf N and P concentration. Schima superba had low leaf N and P concentration, while its Amax was high and had significant positive relationship with Amax.. Lithocarpus glaber had high leaf N concentration in degradation plots, which maintained at higher degree and was related positive with Amax significantly, and had high ability of defending leaf against high light. Castanopsis carlesii had medium Amax, SLA, leaf N and P concentration; its Amax and SLA had high plasticity, while leaf N concentration was steady. Castanopsis fargesii had low Amax and ability of the utilization of high light. Related Articles | Metrics Select Real time near infrared light face detection based on morphology 华东师范大学 计算机科学与技术系;上海 00 Journal of East China Normal University(Natural Sc    2010, 2010 (3): 39-47.   Abstract （3150）      PDF （1465KB）（1709）       Knowledge map    This new face detection algorithm first used Harr feature and Adaboost algorithm for locating the face area, and then normalized the area into specified size. Utilizing the property of high reflection rate under near infrared light on pupil, Quoit filter based on morphology was used for eye detection. In order to deal with difference sizes of pupil, a multi scale filter was proposed for reducing both of false positive rate and false negative rate. The experience showed that this method is accuracy and fast. And it fits the requirement of real time face detection Related Articles | Metrics Select UML based design information extraction and its application in software refactoring LIU Chuan-bo;YANG Zong-yuan;XIE Jin-kui Journal of East China Normal University(Natural Sc    2010, 2010 (3): 48-57.   Abstract （2582）      PDF （1362KB）（1419）       Knowledge map    By using UML(Unified Modeling Language) , this parer proposed a relationshipbased modeling method to support modeling and extraction the information contained in the design stage of software development. A prototype system was implemented. The extracted design information can be used in software refactoring, testing, as well as in aspectoriented programming. This approach is able to exploit the design phase semantic information and assist in software refactoring. Related Articles | Metrics Select Enhanced low field magnetoresistance in nanostructured Sr2FeMoO6/CeO2 composites LI Xiang-Hu;LI Dan Journal of East China Normal University(Natural Sc    2010, 2010 (3): 57-62.   Abstract （2507）      PDF （1540KB）（1387）       Knowledge map    The electric transport properties of the nanostructrued (Sr2FeMoO6)1- x/(CeO2) xcomposition were investigated. It was found that the lowfield magnetoresistance of the composition is higher than that of the pure Sr2FeMoO6/CeO2 material in the whole region of temperature. The magnetoresistance ratios at 10 K and 300 K with H=2 kOe for the x =0.3 sample are 1.7 times and 1.3 times as large as that for the pureSr2FeMoO6, respectively. This means that the spin dependent tunneling at the interfaces of grain boundaries is responsible for the enhanced MR. Related Articles | Metrics Select Optimization of soft magnetic property for Co-based glass covered microwires YANG Qi-yan;ZHANG Qing;CHEN De-lu;ZHAO Zhen-jie Journal of East China Normal University(Natural Sc    2010, 2010 (3): 63-67.   Abstract （2437）      PDF （1047KB）（1626）       Knowledge map    This paper studied the Giant Magnetoimpedance (GMI) and field sensitivity (ζ) of Cobased microwires with different diameters and under different annealing current densities, which was prepared by the TaylorUlitovsky method. The results showed that with the increase of diameters of the microwires the GMI and ζ both increase first and then decrease. The best soft magnetic property is obtained for the microwires with 29 μm in diameter. The highest field sensitivity (602 %/Oe ) is found under 120 A/mm2 current annealing. Related Articles | Metrics Select Survey of the crossing number of graphs HUANG Yuan-qiu;WANG Jing Journal of East China Normal University(Natural Sc    2010, 2010 (3): 68-80.   Abstract （2741）      PDF （362KB）（1562）       Knowledge map    This paper gave a comprehensive review of the studies of the crossing number in China and in the world during the last 60 years, from the following 4 aspects: The crossing number of some particular graphs, the lower bound of crossing numbers, parameters related to crossing numbers, and crossing numbers of other types. Related Articles | Metrics Select Decycling squares of trees BAU Sheng;HOU Jian-ping Journal of East China Normal University(Natural Sc    2010, 2010 (3): 81-84.   Abstract （2691）      PDF （278KB）（1420）       Knowledge map    A recursive relation for the decycling numbers of the squares of trees was established, together with an interpolation result on the decycling numbers of the squares of trees of order n. The results here facilitate computation of decycling numbers of the squares of trees. Related Articles | Metrics Select Some sufficient conditions for a planar graph of maximum degree four to be Class 1 NI Wei-ping Journal of East China Normal University(Natural Sc    2010, 2010 (3): 85-91.   Abstract （3070）      PDF （234KB）（1254）       Knowledge map    By applying discharging method, we showed that a planar graph G with maximum degree four and girth g is of class 1, if it satisfies one of the following conditions. (1) G does not contain cycles of length from 4 to 9; (2) G does not contain 4-cycles and 5-cycles, and two 3-faces are not incident with a common vertex; (3) G does not contain cycles of length from 5 to 8, and two 3-cycles, two 4-cycles are not incident with a common vertex ; (4) g≧geqslant 4, G does not contain chordal-8-cycle, and two 4-faces are not incident with a common vertex. Related Articles | Metrics Select Multi-scale asymptotic solutions of multi-field coupled equations HOU Lei;ZHANG Jia-jian;Qiu Lin; Journal of East China Normal University(Natural Sc    2010, 2010 (3): 92-97.   Abstract （2820）      PDF （294KB）（1372）       Knowledge map    This article described the complex fluid and the field constraints with gravitational effects.The asymptotic solution determines the dissipative equilibrium vector field of the coupled convection disturbance kinetic equations. For the analysis of the canonical and singular perturbation problems we analyze the micro-phenomena of the laboratory and macro-phenomena of nature.Our approach is to use the complex Fourier harmonic analysis, re-scale, and the introduction of new parameters to reduce the three-dimensional coupling dynamic equations into a one-dimensional complex space of boundary-layer. Two examples for the problem of the perturbation characteristic function were given with asymptotic analysis. Example 2 explains the turning point of the transition that from the index oscillation solution to the algebraic solution. Related Articles | Metrics Select Asymptotic solutions of the nonlinear eigenvalue problems in the multi-fieldcoupled dynamic equations HOU Lei;;ZHANG Jia-jian;QIU Lin; Journal of East China Normal University(Natural Sc    2010, 2010 (3): 99-112.   Abstract （3101）      PDF （314KB）（1150）       Knowledge map    This article solved the asymptotic solution of the eigenvalue problem in the dissipative equilibrium vector field of the coupled convection disturbance kinetic equations under the constraind filed and the gravity. The approach is to use the new parameters to reduce the three-dimensional coupling dynamic equations into a one-dimensional complex space of boundary-layer. Further analysis and computing were given on the asymptotic solutions for the nonlinear eigenvalue problem. Finally, a boundary-layer eigenvalue analysis was performed to solve the field coupling perturbation in this paper. Related Articles | Metrics Select Existence and multiplicity of positive solutions to a class of singular third-order ordinary differential equations YAO Qing-liu Journal of East China Normal University(Natural Sc    2010, 2010 (3): 113-118.   Abstract （3226）      PDF （335KB）（1320）       Knowledge map    The positive solutions were considered for a class of nonlinear third-order ordinary differential equations, where the nonlinear term contains first derivative of unknown function and may be singular in the term variable. The main conditions of the results are local. In other words, the equation may have 1-3 positive solutions provided the integrations of height functions of nonlinear term on some bounded sets are appropriate. Related Articles | Metrics Select On existence of solutions to backward stochastic differential equation with generalized left-Lipschitz coefficients TIAN De-jian;JIANG Long;DENG Fang Journal of East China Normal University(Natural Sc    2010, 2010 (3): 119-125.   Abstract （3077）      PDF （253KB）（1243）       Knowledge map    In this paper, we proved the existence of the solution to a backward stochastic differential equations (BSDE) with the generator satisfying the generalized left-Lipschitz condition. The key idea for dealing with the problem consists in constructing a monotonic sequence of solutions to BSDE and then passing to the limit. We construct a monotonic sequence of solutions by monotonic iteration technique. It is worth noting that the generator may be not continuous with respect to variable yand the varying of generator with respect to variables y and z may be not uniformly with respect to time parameter t. Related Articles | Metrics Select The comparisons among credibility estimators under Esscher premium principle WANG Wei;WEN Li-min;ZHANG Yi Journal of East China Normal University(Natural Sc    2010, 2010 (3): 126-133.   Abstract （3246）      PDF （294KB）（1662）       Knowledge map    This paper built the credibility model under Esscher premium principle, and derived the Bayes premium, Bayes estimator, credibility premium and credibility estimator of individual premium under Esscher premium principle correspondingly. In addition, the differences and connections among those estimators were compared, and the consistency were proved. Finally, the results were shown by simulations. Related Articles | Metrics Select On the fluctuation spectra with respect to complex functions ofthe three-state Markov processes KUANG Neng-hui;CHEN Yong Journal of East China Normal University(Natural Sc    2010, 2010 (3): 134-142.   Abstract （2633）      PDF （181KB）（1394）       Knowledge map    Explicit formulae for the autocorrelation functions and the fluctuation spectra with respect to complex functions of the irreducible three-state Markov processes were investigated. By the theory of cubic and quintic equations, the necessary and sufficient condition for the fluctuation spectra with respect to complex functions to be nonmonotonic on [0,+∞) was presented when there existed coinciding eigenvalues for the transition rate matrix, and the sufficient conditions for the fluctuation spectra with respect to complex functions to be nonmonotonic on [0,+∞)were given when there existed distinct nonzero eigenvalues. Related Articles | Metrics Select Critical problems of totally isotropic subspaces in finite pseudo-symplectic spaces ZHAO Yan-bing;QIAN Guo-dong;HUO Yuan-ji Journal of East China Normal University(Natural Sc    2010, 2010 (3): 142-148.   Abstract （2783）      PDF （254KB）（1337）       Knowledge map    With the properties and counting theorems of the finite pseudo-symplectic spaces, this paper studied the critical problems of totally isotropic subspaces in the finite pseudo-symplectic spaces and obtained the corresponding counting formulas and critical exponents Related Articles | Metrics Select Saltwater intrusion in the Changjiang Estuary in the extremely drought hydrological year 2006 ZHU Jian-rong;WU Hui;LI Lu;WANG Biao Journal of East China Normal University(Natural Sc    2010, 2010 (4): 1-6.   Abstract （2858）      PDF （2135KB）（1957）       Knowledge map    It was observed that the extremely low discharges of the Changjiang River, caused by a serious drought in the river’s basin in summer 2006, made a strong saltwater spring over the North Branch in the Changjiang Estuary occured in that year 3 months earlier than usual. The salinity at surface was higher than the one at bottom in the South Branch near the bifurcation of the South and North branches, vertical stratification was obvious, whereas the salinity was vertical homogeneous in the other place of the South Branch due to the strong vertical tidal mixing. Due to the effect of saltwater spilling over from the North Branch into the South Branch and salinity accumulation, the occurred time of the maximum salinity at the Chongtou was about 3 days later than that of the highest tidal level at Qinglonggang, and it took about 2 days for the spilling over saltwater to the downstream Chenhang reservoir by the river discharge. Related Articles | Metrics Select Climate changes and their influence on the massbalances of GlacierNo.1 in the headwater of Urumqi River, Tianshan, China SHEN Qi;XU Jian-hua;WANG Zhan-yong;WANG Fei-teng Journal of East China Normal University(Natural Sc    2010, 2010 (4): 7-15.   Abstract （2554）      PDF （4109KB）（1646）       Knowledge map    Based on the daily data of temperature, rainfall, flow and relative humidity, this paper attempted to show the characters of climate change at Urumqi Glacier No. 1 in recent 10 years by wavelet analysis. Furthermore, grey entropy relational analysis was used to study the correlation between the glacier mass balances and various meteorological elements. The results indicated that: (1)at the scale of 4 d, 16 d, 32 d and 64 d, the changes of meteorological factors in the study area have three major characteristics represented by stages, periodicity, and weak trend; (2)at a wider time scale, there is a non-symmetry change between the maximum and the minimum of temperatures; (3)during the period of 1996-2004, the glacier mass balance is mainly affected by the temperature factors; (4) the precipitation from September to May(the balance year) is the main source of Glacier accumulation. Related Articles | Metrics Select Analysis of storm surge’s process under the influence of waves CHEN Hua-wei;GE Jian-zhong;DING Ping-xing Journal of East China Normal University(Natural Sc    2010, 2010 (4): 16-25.   Abstract （2840）      PDF （4836KB）（1658）       Knowledge map    Four typhoon storm surges which affected Changjiang Estuary and its adjacent seas seriously during 2007—2008 were computed by using a 2D storm surge prediction model set up by Hu et al, and the effects of waves on storm surges were discussed. It was found by comparison that the impact of waves on storm surges depends on typhoon’s tracks, locations, and different times. The precision of predication of storm surges can be improved if the influence of waves on storm surges is considered in the days around typhoons’ landing. When a typhoon was close to the shore, the waves broken and affected the storm surge, so it is more reasonable to take account of the influence of waves. It’s necessary to compute waves for the south landing and northwards typhoons. Related Articles | Metrics Select Artificial neural network classification of wetland integrating GIS data: A case study of Dongtan wetland in Chongming, Shanghai LI Xiao-dong;GUO Zhong-yang;ZHU Yan-ling;DAI Xiao-yan Journal of East China Normal University(Natural Sc    2010, 2010 (4): 26-34.   Abstract （3088）      PDF （2907KB）（1738）       Knowledge map    This paper took Dongtan wetland in Chongming Island, Shanghai, as a case study; using the PCA outputs of TM surface feature spectrum, NDVI, MNDWI, DEM and the GIS data as inputting elements of an Artificial Neural Network (ANN), combined with improved BP algorithm, an ANN classification was applied to the Dongtan wetland. The results show that the ANN classification method improves the classification accuracy, and can effectively distinguish those objects with similar TM spetra. Related Articles | Metrics Select Approxnatural ecological restoration engineering and effectivenessanalysis of degraded Liwa Creek ecosystems LI Jing-wen;SHI Wen;YU Li-fan;LUO Hong;DA Liang-jun;;SHEN Kungen Journal of East China Normal University(Natural Sc    2010, 2010 (4): 35-43.   Abstract （2459）      PDF （1144KB）（2132）       Knowledge map    Based on the eutrophication status and river channel characteristics of Liwa Creek, with the establishment of threedimentional plant communities and animal communities, the approxnatrual restoration engineering was carried out after traditional environmental engineering techniques. By comparing the changement of water quality, plant and animal communities in Liwa Creek before and after the engineering, the effects of this approxnatural restoration engineering were validated in this paper. The results show that after oneyear’s approxnatural restoration engineering measurement, TN and TP dropped respectively to 0.41 mg/L and 0.03 mg/L; contents of chlorophyll a dropped to 7.86 μg/L; Water quality was improved to a large degree, changing from the original class V to class Ⅱ standard. Besides, with the direct introduction of zoo benthos which filter feeding algae, Silver carp and bighead carp, biodiversity of animal communities is improved to a certain degree during the regulation of algae biomass. Practice proves that approxnatural restoration engineering is effective in the case of Liwa Creek based on low cost, which can finally be promoted during the approxnatural restoration practice of urban ecosystem. Related Articles | Metrics Select Distribution and characteristics of the mossy dwarf forests in China XU Jie;WANG Xi-hua Journal of East China Normal University(Natural Sc    2010, 2010 (4): 44-57.   Abstract （2821）      PDF （1371KB）（2522）       Knowledge map    Based on plots investigation and literatures of the mossy dwarf forests, this study tried to determine their distribution in China, analyzed the species composition and floristic geographic elements of this kind of forests, and calculated the similarity among communities. The results showed that these communities scattered in a large areas of southern provinces as “islands” in China, with the northern boundary located in the Funiu Mountain in Henan Province. The distribution sites appeared to vary with threestep topography in China and altitude in every specific mountain. The floristic composition which included 16 species of Pteridophytes and 251 species of Spermatophytes was not complicated. The floristic arealtype elements were affected by tropical and subtropical flora,and also influenced by temperate. From east to west, significant differences was found to exist in mossy dwarf forest communities: in the east the similarity was higher while the richness 〖JP2〗was lower in the eastern and northern part. In view of the unique habitats and particular distribution of these communities, more attention should be paid to the protection of this type of ecosystem and further studies are needed. Related Articles | Metrics Select Differences of microbial amounts on plant roots and packing biofilms in the biological grid YU Rui-zhang;ZHANG Hui;JIANG Jun;SHEN Ye-hong; YANG Qing-hai;LI Xiu-yan Journal of East China Normal University(Natural Sc    2010, 2010 (4): 58-66.   Abstract （2528）      PDF （1307KB）（1871）       Knowledge map    The designed device mainly consisted of combined packing, Cannas, and aquatic animals. Water from Suining Creek, a tributary of the Suzhou Creek in Shanghai, was used as experimental water. Differences of microbial amounts on plant roots and packing biofilms in the device was analyzed to find the mechanisms of microorganisms in the system. The resluts show that the mineralization, amination, nitrification and denitrification may complete at the same time, with the mineralization, amination, nitrification mainly on the surface of plant roots, and the denitrification mainly on the filling material. The plant roots and the filling material provide appropriate natural environment for heterotrophic bacteria, nitrifying bacteria and denitrifying bacteria. The total amounts of heterotrophic bacteria on the surface of per unit mass plant roots are about ten times more than those on the surface of the filling material. Plant could provide root with oxygen, hence, nitrifying bacteria amounts on the surface of per unit mass roots and of the filling material are: roots＞filling material of experimental group＞filling material of control group. But for the denitrifying bacteria, it behaves: filling material of control group＞filling material of experimental group＞roots. The amounts and types of microfauna on roots are more than those on the packing films, whose diversity index were 2.16 and 2.08 respectively. Related Articles | Metrics Select Influences of aeration and packing types on the biofilm microbialcommunity of biological grid device LI Xiu-yan;ZHANG Yan;LIU Jun;LI Hua-zhi Journal of East China Normal University(Natural Sc    2010, 2010 (4): 67-76.   Abstract （3037）      PDF （2344KB）（1583）       Knowledge map    A biological grid device, consisting of hydrophytes and packings, was constructed to reinforce treatment of eutrophic river water. A pilot scale experiment was performed to study the influences of aeration and packing types on pollutant removal and characteristics of microbial community on biomembrane. Seven reaction tanks were parallelly connected and the process was continuously influent and effluent, with water inflow designed to be 6 m3· d-1. The results show that packings, working as microbial carriers, have important roles on pollutant removal. Reaction tanks with packings have higher removal efficiencies of COD，Cr，total N and NH+4，N, with 42.1%～52.2%, 24.4%～47.8% and 58.7%～71.4% higher than those with none packing tanks, respectively. Compared with suspended packings, combined packings and the new type packings have complicated microsetting, thus have higher removal efficiencies of total N. At the same time, intermittent aeration have higher pollutant removal efficiency for all three packings than none aeration ones. ERIC-PCR fingerprinting analysis shows that similar band patterns have been found from biofilm samples of the three kinds of packings before the maturity of biofilms. Along with the maturity of biofilms and system stabilization, biofilm band patterns are divided into two types，suspended carriers have one kind and the combined packings as well as the new type packings have the other. At the same time, microbial population diversity increases and pollutant removal efficiency goes up for all the three packings types. Intermittent aeration tanks （No. 3 and No. 5） have more microbial population diversity than none aeration ones (No. 2 and No. 4), which are in favor of pollutant removal. Therefore，along with stable operation，microbial population diversity index increases and system is in good condition. Related Articles | Metrics Select Clone, expression of allantoicase gene from Dictyostelium disc-oideum and preparation of polyclonal antibody against ALC CHEN Neng-xing;WEI Xiao-jing;LIU Wei;HOU Lian-sheng Journal of East China Normal University(Natural Sc    2010, 2010 (4): 77-84.   Abstract （2840）      PDF （1184KB）（1562）       Knowledge map    The coding region of allCis obtained from total mRNA of Dictyostelium discoideumby RT-PCR. The results show that the length of allC is 1 100 bp with sequence analysis and coded protein is 42 kD.Becase it is a differentially expression fragments, indicating that the gene play an important role in multicellular development and allC was cloned into the fusion expression vector pET-32a(+) with 6 His tagged and expressed in E. coli BL21 (DE3) host cells. and then purified by Ni2+ affinity chromatography column and fusion protein purified was used to immune the New Zealand rabbits for preparing polyclonal antibody. The fusion protein was successfully expressed and polyclonal antibody was also successfully obtained. The potency of the antibody was as high as 1∶64 000. The specificity of antibody was proved by Western Blotting analysis of expression product of allC. These data suggest ALC fusion protein has the good antigenicity. The antibody with high titer and specificity was obtained in the satisfaction of Western blot and localization experiment request , which was the foundation to farther study the characters of the allantoicase protein and their function during Dictyostelium discoideumdevelopment. Related Articles | Metrics Select Screening the suppressors of uro by EMS mutagenesis and Ac/Dstransposon system ZHANG Liang;YANG Yang;SUN Yue;XU Yanfei;YU Chen;ZHOU Wei;TANG Hongbo;LI Xiaofang Journal of East China Normal University(Natural Sc    2010, 2010 (4): 85-91.   Abstract （3083）      PDF （1230KB）（1621）       Knowledge map    It was suggested that URO function might be associated with auxinmediated plant development. In order to know the role and the genetic net work ofURO gene, suppressors(double mutants with suppressed phenotype of uromutant) were screened through EMS mutagenesis and Ac /Ds transposon system. Several suppressors have been selected, validated and further analyzed. These suppressors will provide important clews for the function network of URO gene. Related Articles | Metrics Select Preparation of Grifola frondosa polysaccharide sulfatedderivatives and their inhibitory effects on HMEC migration MAO Yi-rong;ZHANG Yi;ZHANG Hong-xia;WENG Liang;ZHANG Hong-feng Journal of East China Normal University(Natural Sc    2010, 2010 (4): 92-102.   Abstract （2338）      PDF （3003KB）（1565）       Knowledge map    Polysaccharides from Grifola frondosa (GFP) were extracted by hot water and precipitated by 95% EtOH. GFP1-F，GFP1-M and GFP1-L were further purified by DEAE-cellulose and Sephadex G-100 subsequently from GFP. GFP1-F，GFP1-M and GFP1-L were glucan with molecular weight 1.09×10^5, 1.93×10^4 and 2.76×10^3 Da. GFP1-FS, GFP1-MS and GFP1-LS were polysaccharide sulfates obtained from GFP1-F，GFP1-M and GFP1-L with chlorosulfonic acidpyridine. The IR spectrum of GFP1-FS，GFP1-MS and GFP1-LS showed the characteristic absorptions of sulfate ester bond at 1 230 cm^-1and 810 cm^-1 . The 13C-NMR results indicated the modification mainly occurred at C-6 of the polysaccharide sulfates. GFP1-MS had the greatest sulfated degree with DS 1.07, while DSs of GFP1-FS and GFP1-LS were 0.66 and 0.61 respectively. The scratching assay suggested that 73.33%，34.17% and 67.21% cells migrated to scratching area compared with control after 24hour treatment of 1 000 μg/mL GFP1-FS, GFP1-MS and GFP1-LS respectively. So that all the three sulfated derivatives had inhibitory effects on HMEC migration, especially GFP1-MS had the strongest activity which may be related with its complicated branch structure. Related Articles | Metrics Select SKF83959 regulates locomotion activity and anxiety in rats DU Dan;ZHANG Shuang;DONG Su-zhen Journal of East China Normal University(Natural Sc    2010, 2010 (4): 103-110.   Abstract （2480）      PDF （1213KB）（1565）       Knowledge map    To investigate the effects of the selective agonist of dopamine D1-like receptors SKF83959 in locomotion activity, anxiety, and learning and memory，3monthold male rats were randomly divided into two groups：drugadministrated group in which SKF83959 was injected (i.p. 1.0 mg/kg), and control group in which PBS buffer with equivalent volume was employed instead of SKF83959. Behavioral tests were then conducted. SKF83959 administration induced a significant increase in both total move times and total move time, as revealed by open field test. In elevated plus maze test, rats in drugadministrated group exhibited much longer time staying in the close arms, with significant decreases in entries to total arms, the open arms and the close arms. However, fear conditioning test showed no difference in fear memory between drugadministrated group and control group. The results indicate that SKF83959 can enhance the locomotion and anxiety. However, it does not affect the fear memory in rats. Related Articles | Metrics Select IRF7 expression and its association with systemic lupus erythematosus MIAO Qian;TANG Yuan-jia;HUANG Xin-fang;QIAN Xiao-xia;HUANG Xiu-qin;SHEN Nan; Journal of East China Normal University(Natural Sc    2010, 2010 (4): 111-117.   Abstract （2462）      PDF （1196KB）（1793）       Knowledge map    To explore the relationship between the expressions of interferon regulatory factor 7 (IRF7) and the pathogenesis of SLE in Chinese Han cohort, the IRF7 mRNA expression levels in peripheral blood of patients and normal individuals were tested by using realtime quantitative PCR technique, and then were compared with the IFN level in serum, IFN score and SLEDAI score. It is demonstrated that the expression level of IRF7 mRNA in SLE patients is significantly increased, and is positively correlated with the IFN level in serum, IFN score and SLEDAI score. So it is concluded that the increase of IRF7 expression may excessively activate the interferon pathway and lead to SLE. Related Articles | Metrics Select Thyroid disrupting effects of perfluorooctane sulfonate on Xenopus laevis LIU Jun-qi;LIU Qing-po;CAO Qing-zhen;QIAN Li-juan;GUO Su-zhen;SHI Hua-hong Journal of East China Normal University(Natural Sc    2010, 2010 (4): 118-124.   Abstract （2381）      PDF （1803KB）（1647）       Knowledge map    The amphibian metamorphosis assay (AMA) was used to detect thyroid disrupting effects of perfluorooctane sulfonate (PFOS). Xenopus laevis tadpoles at stage 51 were exposed to 10, 50 and 250 μg·L-1 PFOS. The growth, metamorphosis and thyroid histology were observed. After 7 days of exposure, the hind limb lengths were decreased by 11%～18%, and 1 or 2 developmental stages were delayed in treatment groups compared with the control. After 19 days of exposure, the body weights were increased by 10%～20%, the body lengths were increased by 4%～6%, and the hind limb lengths were decreased by 12%～13% in treatment groups. PFOS decreased the number of thyroid follicles, in which cell hyperplasia, colloid depletion and vacuolation were observed. These results suggested that PFOS inhibited the development and increased the growth of X laevis. According to AMA, our results indicated that PFOS was an antithyroid hormone disrupting chemical. Related Articles | Metrics Select α-Halogenation of carbonyl compounds with 1,3-dihalo-5,5-dimethylhydantoin CHEN Zi-zhan;GUAN Xi-xia;ZHENG Zu-biao;ZOU Xin-zhuo Journal of East China Normal University(Natural Sc    2010, 2010 (4): 125-130.   Abstract （3014）      PDF （1007KB）（2095）       Knowledge map    α-Bromination of aliphatic ketones using 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) in methanol at room temperature was described. α-Chlorination of aliphatic ketones, β-keto-esters and malonic ester using 1,3-dichloro-5,5-dimethylhydantoin (DCDMH) and p-toluenesulfonic acid in acetonitrile at 25 ℃ was also reported. β-Keto-esters and dimethyl malonate give α-monochloroproducts in high yields (87%~96%). Related Articles | Metrics Select Study on the synthesis，crystal structure and thermal stability of ［Zn(IBG)(H2O)3］·2H2O XU Han;LI Yi-zhi Journal of East China Normal University(Natural Sc    2010, 2010 (4): 131-136.   Abstract （2375）      PDF （1257KB）（1572）       Knowledge map    The complex ［Zn(IBG)(H2O)3］·2H2O (H2IBG= isophthaloylbisglycine) was synthesized and its crystal structure was characterized by X-ray diffraction. The compound crystallizes in orthorhombic crystal system, space group C222(1), with Mr=431.65，a=0.693 01(14) nm，b=0.772 56(14) nm，c=23.006 4(6) nm, V=1.609 61 nm^-3，Z=4，Dc=1.781 g·cm^-3，F(000)=888.0. The molecular structures are stabilized by hydrogen bonds. The title compound was measured by IR, thermogravimetric analysis and XRD. Related Articles | Metrics Select Survey of maximum genus of graphs Ren Han;Li Gang Journal of East China Normal University(Natural Sc    2010, 2010 (5): 1-13.   Abstract （2816）      PDF （262KB）（1859）       Knowledge map    Research developments on maximum genus of graphs in graph embedding theory since 1971 were reviewed, including the following aspects: the relationships between maximum genus and other graph invariants such as connectivity, diameter, girth, chromatic number and z-factors; maximum genus and embedded graphs; and number of maximum genus embeddings. Related Articles | Metrics Select Spectral radius of the complement of unicyclic graphs LIU Juan;ZHANG Zhao Journal of East China Normal University(Natural Sc    2010, 2010 (5): 14-19.   Abstract （2974）      PDF （214KB）（1432）       Knowledge map    This paper considered the following problem: Among all the complements of unicyclic graphs with order n, which one has the maximum spectral radius? It was showed that the extremal graph is S_n^3, where S_n^3 is obtained from a 3-cycle by attaching n-3 pendant vertices to a vertex. Related Articles | Metrics Select Edge coloring of planar graphs for maximum degree six without adjacent k-cycles NI Wei-ping Journal of East China Normal University(Natural Sc    2010, 2010 (5): 20-26.   Abstract （2741）      PDF （238KB）（1169）       Knowledge map    By applying discharging method and using the properties of critical graphs, we proved that every simple planar graph G with Delta =6 is of class 1, if any two k-cycles of length at most 6 are not adjacent. Related Articles | Metrics Select One kind of inverse eigenvalue problems with a submatrix constraint ZHAO Lin-lin;CHEN Guo-liang Journal of East China Normal University(Natural Sc    2010, 2010 (5): 27-32，5.   Abstract （2418）      PDF （313KB）（1101）       Knowledge map    In this paper, the inverse eigenvalue problem of anti-reflexive matrices with a submatrix constraint was discussed. The sufficient and necessary conditions under which the problem was solvable were obtained by using the matrix decompositions, and the general expression of the solution was given. Related Articles | Metrics Select Expression of the Moore-Penrose inverse of A-XY* DU Fa-peng;XUE Yi-feng Journal of East China Normal University(Natural Sc    2010, 2010 (5): 33-37,4.   Abstract （3005）      PDF （205KB）（1790）       Knowledge map    By using theory of bounded linear operators on Hilbert spaces, the Shermen-Morrison-Woodbury (SMW) formula's Moore-Penrose inverse was presented. The formula obtained can be used to compute certain perturbation of A^+ and the Moore--Penrose inverses of some operator matrices. Related Articles | Metrics Select EM algorithm for degradation data analysis XU An-cha;TANG Yin-cai Journal of East China Normal University(Natural Sc    2010, 2010 (5): 38-48.   Abstract （2876）      PDF （300KB）（1512）       Knowledge map    Statistical inference procedures were proposed in assessing product reliability based on EM algorithm. The general formulae to estimate parameters were derived in the degradation model when its random effects follow an exponential family, and sensitivity of the choice of the distributions of the random effects was assessed via simulation. Two real data sets were analyzed. Related Articles | Metrics Select Variance-optimal hedging strategy for several options XU Song; Journal of East China Normal University(Natural Sc    2010, 2010 (5): 49-55.   Abstract （2937）      PDF （307KB）（1390）       Knowledge map    This paper explicitly computed the variance-optimal hedging strategy in discrete time for binary options and European call option on Dividend-paying Stock. An example of prediction of dividend was given. Related Articles | Metrics Select Large time behavior of a solution for the modified Navier-Stokes equations FENG Zhen-zhen;WU Luo Journal of East China Normal University(Natural Sc    2010, 2010 (5): 56-66.   Abstract （2648）      PDF （284KB）（1327）       Knowledge map    In 1966, O. A. Ladyzhenskaya proposed a kind of modified Navier-Stokes equations to describe the three-dimensional nonstationary flows of viscous incompressible fluids without assuming small gradients of the velocities. This paper considered large time behavior of a solution for the modified Navier-Stokes equations in a bounded domain and showed that decay of the solution is exactly of exponential type when force term is equal to zero. Moreover the ratio of the enstrophy over the energy has a limit as time tends to infinity, and the limit is an eigenvalue of the Stokes operator. Related Articles | Metrics Select Stability of peakons for the DGH equation CHEN Hui-ping Journal of East China Normal University(Natural Sc    2010, 2010 (5): 67-72, .   Abstract （2722）      PDF （314KB）（1650）       Knowledge map    The peakons are peaked solitary wave solutions of a certain nolinear dispersive equation that is a model in shallow water theory. In this paper, the author showed that the peaked solitons to the DGH equation were orbital stable in H^1 norm by constructing a functional and conservation laws. The stability theorem indicates that, if a wave is close to the peakons at the beginning, it will remain close to some translate of it at any time later. Related Articles | Metrics Select Heterodimensional cycle bifurcation of a spatial quadratic system WANG Li-ying Journal of East China Normal University(Natural Sc    2010, 2010 (5): 73-83.   Abstract （2239）      PDF （729KB）（1488）       Knowledge map    A concrete nonlinear system with degree two and the least dimension (=3) was firstly given, and it was shown that the system has a heterodimensional cycle with double orbit flips. Then, by using Silnikov coordinates and moving frame, the bifurcation of the cycle was studied under the perturbation of degree three. The method given here provides a useful reference for constructing homoclinic, heteroclinic and heterodimensional cycles with various other kinds of degeneracy. Related Articles | Metrics Select Existence of Darboux polynomial and periodic orbit of a quadratic system DENG Gui-feng Journal of East China Normal University(Natural Sc    2010, 2010 (5): 84-90.   Abstract （3160）      PDF （309KB）（1327）       Knowledge map    This paper derived the necessary and sufficient condition for the existence of invariant real irreducible algebraic curve of a polynomial differential system. Using this result and quadratic polynomials of quadratic system, we established some criteria to determine whether equilibrium was circled by a closed orbit. Finally, a property of the equilibrium enclosed in a periodic orbit was deduced for quadratic system. Related Articles | Metrics Select Dimension of the intersection of the Cantor ternary set with its two translations ZHANG Yun-xiu Journal of East China Normal University(Natural Sc    2010, 2010 (5): 91-95.   Abstract （2724）      PDF （184KB）（1237）       Knowledge map    Let C be the Cantor ternary set. The condition of the intersection C\cap (C+t)\cap (C+s)\neq\emptyset was considered and the Hausdorff dimension of (t,s) was computed when the intersection was nonempty. A conclusion was proved: dim_H C\cap (C+t)\cap (C+s)=0 for a.e. (t,s)\in{\bf R}\times {\bf R}. Then by a related result of Moran set, the expression of dim_H C\cap (C+t)\cap (C+s) was investigated. Related Articles | Metrics Select Automatic web data extraction based on tree alignment JING Han-xing;CHEN Shao-hong;YU Kun Journal of East China Normal University(Natural Sc    2010, 2010 (5): 96-102.   Abstract （2561）      PDF （2535KB）（1392）       Knowledge map    This paper proposed a new tree alignment algorithm for determining the optimal matching structure of the input web pages, in order to extract web data automatically. Based on the alignment, the trees were merged into one union tree whose nodes record statistical information obtained from multiple web pages. The algorithm detects repeating patterns on the union tree, and a wrapper built on the most probable content block and the repeating patterns extracts data from web pages. Experimental results showed that the proposed algorithm achieves high extraction accuracy and has steady performance. Related Articles | Metrics Select Fabrication of two-dimensional photonic crystal based on polystyrene template WU Wei;YU Ke;ZHU Zi-qiang Journal of East China Normal University(Natural Sc    2010, 2010 (5): 103-109.   Abstract （2585）      PDF （1695KB）（2054）       Knowledge map    Polystyrene photonic crystal and a series of two-dimensional (2D) photonic crystals based on polystyrene template were prepared, including two-dimensional photonic crystal of α-Fe2O3 bowls and two-dimensional photonic crystal of ZnO pillars. Large-area specular reflectance measurements showed the presence of photonic stop band. Self-assembled PS is a simple, low cost and repeatability method to fabricate large-area two-dimensional photonic crystal. It offers a new idea on preparing two-dimensional photonic crystal. Related Articles | Metrics Select Electrical conductivity properties of MWNTs/Br2doped polyaniline composites WU Ling-juan;YE Jing;HAN Fei-fei;LIANG Dan;GAO Jian-sheng;SHENG Wei;XU Xue-cheng Journal of East China Normal University(Natural Sc    2010, 2010 (5): 110-117.   Abstract （2896）      PDF （1153KB）（1292）       Knowledge map    Br2 doped PANI was synthesised by chemical oxidation method and absorption of bromine vapor. MWNTs/PANI and MWNTs/Br2 doped PANI composites were prepared by mechanical blending method, The new composite exhibits as high electrical conductivity as that of pure MWNTs. 5~10 S·m^-1. Fourier transform infrared spectroscopy (FTIR), thermo gravimetric (TG), ultraviolet-visible absorption spectra (UV-Vis), X-ray powder diffraction (XRD) and X-ray spectroscopy (XPS) were used to study the electrical conductivity properties and mechanism. The results showed that π-π and p-π system is formed between MWNTs and doped PANI . MWNTs combined with the Br2 doped PANI to form charge transfer composites, then form individual conductive units, which play a critical role in forming the conducting net of composites. With the increase of conductive units, conducting system is formed by conductive unit connection and the conductivity of composites reaches the maximum. Related Articles | Metrics Select Conductive properties of bromine doped PPA/bromine doped nano graphite YE Jing;WU Ling-juan;LIANG Dan;HAN Fei-fei;SHENG Wei;GAO Jian-sheng;XU Xue-cheng Journal of East China Normal University(Natural Sc    2010, 2010 (5): 118-125.   Abstract （2791）      PDF （567KB）（1453）       Knowledge map    The electrical conductivity of polyphenylacetylene (PPA) was enhaced by eleven orders of magnitude after absorption of bromine vapor. TG, UV-Vis spectra, and XPS spectra were used to study the interaction among bromine, nano-graphite and PPA. According to the results, bromine played a major role to enhance the conductivity of the composites when the weight percentage of bromine doped graphite was low. When the weight percentage of bromine doped graphite was high, the doping effect formed by bromine doped nanographite and bromine doped PPA, was the main point to enhance the conductivity. When the weight percentage of bromine doped nano-graphite was higher, the conductive network formed by bromine doped nano-graphite, played a major role. Related Articles | Metrics Select Synthesis of monodisperse PS microspheres and self-assembly of the colloidal crystals SONG Juan;CHEN Qi-ming;YAN Ya; Journal of East China Normal University(Natural Sc    2010, 2010 (5): 126-133.   Abstract （2409）      PDF （1708KB）（2146）       Knowledge map    Monodisperse polystyrene (PS) colloidal particles were prepared by a quick emulsifier-free emulsion polymerization (EFEP) method, and their highly ordered colloidal crystals were fabricated by both centrifugal method and vertical surface method. Scanning Electron Microscope (SEM) and VIS-UV were used to study the topography, structure and optical properties of the colloidal crystals. The resulting planar samples by centrifugal method were distinctly thicker than that by vertical surface method. PS colloidal crystals by centrifugal method with a velocity of 1 000 r/min and a temperature of 40 ℃ exhibited a highly ordered three-dimensional structure. The optimized assembly conditions were discussed via samples’ optical properties and the transmission spectra showed the peak wavelength suffered a shift with the change of the PS spheres’ diameter. Related Articles | Metrics Select Study on scale inhibition properties of γ-PGA SUN Zhao;MA Xiao-jun;HUANG Jing;LIU Wen;WU Zi-rong Journal of East China Normal University(Natural Sc    2010, 2010 (5): 134-141,.   Abstract （2162）      PDF （1550KB）（1779）       Knowledge map    Poly-γ-glutamic acid (γ-PGA) produced by fermentation of Bacillus sp was studied as a potential novel green scale inhibitor. The effects of γ-PGA concentration, molecular weight of γ-PGA, temperature, pH and Ca2+concentration on the scale inhibiting rate of γ-PGA were respectively analyzed using static anti-scaling method, and the structural characterization of scale inhibiting products and possible mechanism were investigated. The results reveal that both large molecular γ-PGA and small molecular γ-PGA have inhibiting efficiency. More specifically, small molecular γPGA shows the better inhibiting efficiency with their lowest concentration to get 100% inhibiting efficiency from scale of CaSO4 and CaCO3 being 4 mg/L and 2 mg/L respectively, while large molecular γ-PGA to get the same efficiency in the same condition is 20 mg/L respectively. Related Articles | Metrics Select Experimental study on the damage of glucose fluctuation on cultured human L02 hepatocytes DANG Yong-yan;YE Xi-yun;SHENG Jie Journal of East China Normal University(Natural Sc    2010, 2010 (5): 142-148.   Abstract （2324）      PDF （460KB）（1922）       Knowledge map    The goal of this study is to investigate the effects of glucose fluctuation on cultured human L02 hepatocytes in vitro and discuss its possible mechanism. Cultured cells were randomly divided into 4 groups: normal (N), high glucose (HG), glucose fluctuation (GF) and osmotic pressure (OP). After 72 hours, alanine transferase (ALT), aspartate amino transferase (AST) and lactate dehydrogenase (LDH) in the medium were measured. In the cells, glycogen, glutathione (GSH), superoxide dismutase (SOD), malondialdehyde (MDA), Na+K+-ATP and Ca2+Mg2+-ATP enzyme activities were detected. In addition, cell membrane fluidity was also detected. Compared with the N group, the activities of ALT，AST and LDH in the HG and GF groups increased markedly, while the activities of GSH, SOD, Na+K+-ATP and Ca2+ Mg2+-ATP enzymes were decreased significantly. The contents of glycogen and MDA in the cells of HG and GF groups were increased obviously, while cell membrane fluidity was decreased markedly (all p＜0.01). There are also significantly statistical differences between the HG and GF groups(all p＜0.01). Our results demonstrate that glucose fluctuation can change the permeability of cell membrane, lead to the leakage of enzymes and cause marked oxidative damage and cell toxicity in human L02 hepatocytes. Moreover, the deleterious effects of GF on the L02 cells are significantly higher than that of the HG group. Related Articles | Metrics Select Formation mechanism of Ruifeng Shoal ditch in the Yangtze River Estuary LI Yu-zhong;;CHEN Shen-liang Journal of East China Normal University(Natural Sc    2010, 2010 (6): 1-11.   Abstract （3068）      PDF （6989KB）（1345）       Knowledge map    Based on history charts for the Yangtze River Estuary, formation mechanism of the Ruifeng Shoal ditch was analyzed. With the head part of the Shoal siltting southward, the upside mainstream direction turns southward in the South Channel. Bounced by southern bank, the mainstream will turn northward in the middle part of the South Channel and erode the lower part of the Ruifeng Shoal. Then a ditch on Ruifeng Shoal appears. In the end of 1990s, development of Baoshan North Channel and large amount of sediments from the Nanshatou Channel induced the siltation southward in the head part of the Shoal. The deduction was testified by the tidal current survey and the flow modeling. Related Articles | Metrics Select Exploring the theoretical framework of object-oriented analysis for urban spatial information using remote sensing data YU Bai-lang;LIU Hong-xing;WU Jian-ping Journal of East China Normal University(Natural Sc    2010, 2010 (6): 12-25,6.   Abstract （2982）      PDF （3877KB）（1687）       Knowledge map    In this study, three basic concepts: image object, geospatial object, and urban spatial object were examined, and the dissimilarities and relations among them were elaborated. Three criteriaboundary, attributes, and scale-were proposed to characterize different types of geospatial objects. This research reveals that each geospatial or urban spatial object is defined by three components: identity, state and behavior. These three components are represented by unique name (or identification number), attributes, and relationships respectively. In addition, the information associated with an object has three dimensions: theme, space and time. The thematic, spatial, temporal attributes and relationships are the information underpinnings of a geospatial and urban spatial object. As a significant result of this paper, a general framework for object-oriented analysis of urban spatial information is established. The author believes that this framework may have wide applications in the field. Related Articles | Metrics Select Three dimension numerical simulation of thermal discharge from the Shidongkou electric power plant expand project in the Changjiang Estuary XU Sheng-yi;ZHU Jian-rong;CHEN Bing-rui Journal of East China Normal University(Natural Sc    2010, 2010 (6): 26-34.   Abstract （3081）      PDF （4105KB）（1760）       Knowledge map    By using a improved three dimension numerical ECOM (estuarine, coastal and ocean model), the transport and diffusion of thermal discharge from the Shidongkou electric power plant expansion project in summertime was calculated and analyzed, in terms of the factors of tide, river runoff, wind stress and river surface heat flux. The calculated current speed and direction is consistent with the observed data fairly well, indicating that the model can simulate the hydrodynamic processes correctly. The results show that the thermal discharge is released along with the coast, the influenced extension in the downstream is larger than that in the upstream due to the effect of river runoff. During spring and neap tides the timeaveraged temperature rise near the waterspout of the project is 2.34 and 2.84 ℃, respectively; the areas with surface temperature rise 1.0 ℃ is 0.09 and 0.20 km2, respectively; and the areas with bottom temperature rise 1.0 ℃ are both 0.09 km2, respectively. The current speed is larger, the advection and lateral diffusion of water temperature is greater in spring tide, resulting in temperature rise near the waterspout of the project and its expand extent and magnitude along the coast is obvious smaller in spring tide than in neap tide. Related Articles | Metrics Select Eco-hydrological functions of the evergreen broad-leaved forest litter and soil at different succession stages in Tiantong, Zhejiang SHEN Hui-tao;YOU Wen-hui;JIANG Yue Journal of East China Normal University(Natural Sc    2010, 2010 (6): 35-44.   Abstract （2942）      PDF （1022KB）（1554）       Knowledge map    To study the ecohydrological functions of the litter and soil, we selected shrubland ( Lithocarpus glaber + Loropetalum chinense community), secondary and young evergreen broadleaved forest (EBLF) ( Schima superba community) and mature EBLF ( Castanopsis fargesii community) as research stands. The results showed that the storage of litter layer was as follows: Lithocarpus glaber + Loropetalum chinense community (6.66 t·hm-2)＞mature Castanopsis fargesii community (6.43 t·hm-2) ＞ Schima superba community (6.1 t·hm-2). The water holding capacity in mature EBLF, secondary and young EBLF, shrubs were 10.58，11.29 and 13.88 t·hm-2, and the corresponding effective water holding depth of litter layer in these three types were 0.49，0.55 and 0.73 mm respectively. During the process in water holding of litter layer, the water holding capacity and absorption speed in the first 2 hours were superior to the rest of time. The equations of water holding capacity and water absorption speed with immersed time are Q=alnt+b and V=ktn . Compared with Castanopsis fargesii community and Schima superba community, the physical properties and water holding capacity of soil of Lithocarpus glaber + Loropetalum chinense community didn’t drop behind the other two types of forests. During the studying period, the water storage of three forest soil within the depth of 30 cm was 67.2~150.0 mm. These results suggested that the soil layer had a better water holding capacity than that of the litter layer in different types of the forest. Related Articles | Metrics Select Study on start-up of anaerobic ammonia oxidation reactors with different inocula LIN Jian-bo;GENG Liang;CHEN Yu-xia;HUANG Min-sheng;HE Yan;ZHU Yong Journal of East China Normal University(Natural Sc    2010, 2010 (6): 45-53.   Abstract （2440）      PDF （3208KB）（1739）       Knowledge map    Three different mixed sludges， including anaerobic granular sludge and aerobic activate sludge, river sediments and aerobic activate sludge, anaerobic digested sludge and aerobic activate sludge, were used as inocula in three parallel SBR systems treating typical municipal wastewater, respectively. It was found that the anaerobic ammonia oxidation (ANAMMOX)reactors could be successfully startedup after 150~180 days’ operation with the NH4+-N removal efficiencies of 88%, 80% and 85%, respectively. Moreover, all the NO2--N removal efficiencies of these reactors were more than 96%. Comparatively, the startup period of the seeding sludges, namely the mixed anaerobic digested sludge and aerobic activate sludge,was relatively the shortest. Therefore, the above mixed sludge can be considered a promising inoculum for the start-up of AMAMMOX reactor. Related Articles | Metrics Select Preliminary study on spatial and temporal variations of phytoplankton community in Lake Dianshan YANG Hong;WANG Yi-pin;BO Fang-fang;JIANG Yue;YOU Wen-hui; Journal of East China Normal University(Natural Sc    2010, 2010 (6): 54-63.   Abstract （2985）      PDF （1513KB）（1997）       Knowledge map    In order to evaluate the spatial and temporal variations of phytoplankton community structure in Lake Dianshan, an investigation was carried out from October 2008(autumn) to September 2009 (summer). Total of 384 species were identified. The phytoplankton community was mainly composed by Chlorophyta , Cryptophyta , Cyanophyta and Bacillariophyta . In quantity, the dominated species were Chroomonas acuta , Chlorella vulgaris all year round and Microcystis in summer. The average density of phytoplankton was 4.01×106 cells·L-1, in the order from large to small was: summer, spring, winter and autumn.The ShannonWiener index, Margalef index and Pielou index were ranged from 0.31 to 1.59，2.22 to 7.98 and 0.17 to 0.82 respectively, which meant that both diversity and uniformity of phytoplankton were in healthy status in Lake Dianshan. The structure of phytoplankton was examined by the cluster analysis. The results was that the phytoplankton community can be separated into four groups. GroupⅠ(S3，S6，S7)was in the middle and southwest area, groupⅡ(S1，S2)in the east and southeast, group Ⅲ(S4，S5) in the north and west, groupⅣ (S8) in the south. Groups were classified by quantity and dominated species of phytoplankton. Historical data was also used to analysis the longterm variation of phytoplankton community. Related Articles | Metrics Select Identification of wilt pathogens of potted Chongming narcissus(Narcissus tazetta var. chinensis) MA Tengfei;XU Zhen;FENG Linyan;LI Xiaofang;SUN Yue;XU Ling Journal of East China Normal University(Natural Sc    2010, 2010 (6): 64-71,8.   Abstract （2645）      PDF （2266KB）（1427）       Knowledge map    Using morphologic characters and internal transcribed spacers (ITS) sequence analysis and Inter-simple-sequence -repeat（ISSR）markers, 3 isolates wilt pathogens in potted plant of Chongming narcissus were detected. One was Nectria gliocladioides , while other two were Fusarium moniliforme var. subglutinans . Pathogenic test resulted in that N.gliocladioides was the advantage pathogen, and its optimum growth temperature is 25 ℃. The hypha couldn’t growth while the temperature is lower than 5 ℃ or higher than 40 ℃. The study would be helpful to prevent and cure blight of Chongming narcissus potted plant. ISSR markers are useful for distinguishing the pathogen stains. It could be a molecular assistant means for identification of fungal and species. Related Articles | Metrics Select Preliminary study on the metazoan zooplankton community structure of Fenshuijiang Reservoir and water quality assessment CHEN Liang;LIU Yi;YU Na;FENG Deng-xiang;LI Er-chao;JIA Yong-yi;CHEN Li-qiao Journal of East China Normal University(Natural Sc    2010, 2010 (6): 72-82.   Abstract （2778）      PDF （1413KB）（1857）       Knowledge map    To provide basic information for further reservoir management and restoring, the community structure of zooplankton including species composition, biomass, density, diversity index and chemical and physical parameters were studied monthly in Fenshuijiang Reservoir of Zhejiang province from October 2008 to December 2008. A total of 23 zooplankton species were identified, including 11 Rotifera (48% of the total ), 6 Cladocera (26% of the total ) and 6 Copepoda (26% of the total ). The dominant species mainly were Keratella cochlearis, Asplanchna priodonta, Bosmina longirostris and Mesocyclops dissimilis during this period. The average density of zooplankton ranged 78.0~297.3 ind./L, and the average biomass ranged 2.044~8.924 mg/L in Fenshuijiang Reservoir. The results in this study indicate that the water quality of the Fenshuijiang Reservoir is between α and β type of medium pollution, based on the biological parameters including the qualitative and quantitative analyses of zooplankton community, biodiversity indexes and chemical parameters with integrated pollution index and chemical evaluation index. It was suggested that the further work should be carried out to strengthen the current reservoir ecosystem. Related Articles | Metrics Select Morphology and morphogenesis of microtubular organelles in the cortex of Euplotes eurystomus（Ciliophora，Hypotrichida） SHENG Xin;WANG Zheng-jun;YIN Fei;GU Fu-kang Journal of East China Normal University(Natural Sc    2010, 2010 (6): 83-90.   Abstract （2899）      PDF （2418KB）（1507）       Knowledge map    The cortical microtubular organelles of hypotrichous ciliate Euplotes eurystomus were visualized by using FLUTAX direct-fluorescent labeling. These organelles were composed of ciliature microtubules, ciliature baseassociated microtubules and cortical non-ciliated regions microtubules. The ciliature microtubule and ciliateure base-associated microtubule consists of adoral zone of membranelles(AZM) and membranelle brackets microtubules; undulating membrane(UM) and its base-associated microtubule nets; frontal-ventral-transverse-caudal-cirri (FVTCC), left marginal cirri (LMC) and the anterior longitudinal microtubules(ALM), posterior longitudinal microtubules(PLM),transverse microtubules(TM); the dorsal kineties (DK) and the rosette-like skeletal structure. The cortical non-ciliated regions microtubule comprises leptos microtubule nets in the dorsal and ventral cortex; the oblique microtubules in the dorsal cortex; and the longitudinal microtubules. During the process of the morphogenesis of the ciliatures, the AZM of proter is generated from the old AZM. The old ciliature base-associated microtubules degenerate as the FVTCC of proter and opisthe morphogenesis and differentiate. The old cirri and its associated microtubules might play a role of orientation and localization, but without direct physical contribution. The results provide data for the understanding of the construction of cortical microtubular organelles, the differentiation of cortical microtubules and the regulation of cell in ciliates. Related Articles | Metrics Select Analysis on biological composition and food-chain structure in the urban rivers of Shanghai YU Na;LIU Yi;JIANG Xue-qin;XIONG Ze-quan;MAO Kai-yun;DAI Qi;LI Er-chao;CHEN Li-qiao Journal of East China Normal University(Natural Sc    2010, 2010 (6): 91-100,.   Abstract （3172）      PDF （729KB）（2067）       Knowledge map    The community structure, biodiversity and dominant species of the four urban rivers in Shanghai (Caoyanghuanbang River, Henggang River, Wuchaogang River and Chaoyang River) were investigated during the period of Nov. 2007 to Oct. 2008. Totally, 268 species of phytoplankton, 157 species of zooplankton, 21 speices of macrobenthos, 10 speices of higher plants and 13 speices of fish were identified. In phytoplankton, Chlorophyta, Euglenophyta, Bacillariophyta, Cyanophyta had the highest richness. There were 94 species of protozoan, 44 species of rotiferan, 13 species of cladoceran and 6 species of copepodan in the zooplankton group; the macrobenthos included 14 mollusks, 3 annelidans, 2 crustaceans and 2 insect larvaes; fishes belonged to 7 families in which Cyprinidae was the most abundant species (53.8%). Higher plants included 4 species of submerged plants, 4 species of emerged plants and 2 species of floating plants. The biodiversity of phytoplankton, zooplankton, macrobenthos, fish and higher plants were much higher in Caoyanghuanbang River than the other three, and there was no dominant species for each group, and vegetation was of high density and mainly was emergedplants. While, in Henggang River, the biodiversity of phytoplankton was the lowest and mosquitoeating fish was the only vertebrate species, the most abundant plant was the submerged species. The biomass in Wuchaogang River and Chaoyang River was the lowest among the four rivers in which the dominant species of phytoplankton were Cyanophyta and Chlorophyta. The four rivers were all identified as having simplified food webs based on the analysis of the community composition and distribution of the dominant species. Further suggestions were made that the process of ecological restoration should be different due to the different bioticcomponenttypes of rivers with the aim of enhancing the community structure and the foodchain construction. Related Articles | Metrics Select Effects of auxins on the propagation of Asparagus officinalis L. WANG Jingyu;ZHANG Xueping;YANG Ru;LI Xiaofang Journal of East China Normal University(Natural Sc    2010, 2010 (6): 101-108.   Abstract （2953）      PDF （5198KB）（1799）       Knowledge map    The roles of auxin played in the propagation of asparagus were studied. Exogenous auxin was necessary for the formation of calli, while it wasn’t necessary during proliferation of shoots. The best induction of shoots was achieved with 0.05 mg/L NAA, and more calli induction needed over 1.0 mg/L NAA. The concentration of NAA in the regeneration of shoots hadn’t further influence on rooting. Comparing the four sorts of auxins, NAA, IAA, IBA and 2, 4-D during roots induction of asparagus, IBA is the best choice both in the quality and rate of rooting. Related Articles | Metrics Select Investigation on morphogenesis of slug during Dictyostelium discoideum development LI Li;WANG Da-lei;HOU Lian-sheng Journal of East China Normal University(Natural Sc    2010, 2010 (6): 109-115.   Abstract （2581）      PDF （1995KB）（1605）       Knowledge map    The characters of cell differentiation and cell apoptosis of Dictyostelium discoideum , especially slug, were studied by Acridine orange and Hoechst 33342 staining, two vital fluorescence dyes, with the help of fluorescence microscopy. The results show that different degree apoptosis of the pre-stalk cells during development were referred to the colors, blue-green, green, orange, and finally colorless. In the later of slug stage, a channel-like structure were observed. These data indicate that slug is the initiation phase of cell differentiation and recessionary in Dictyostelium discoideum. Furthermore, the morphological characters change greatly during the slug stage. The pre-stalk cells have already initiated apoptosis since the early stage of slug period. However, their apoptosis is a gradual process. Related Articles | Metrics Select Key technologies in a super large panel autostereoscopicdisplay system TIAN Feng;YU Lei;LIU Jin-gao Journal of East China Normal University(Natural Sc    2010, 2010 (6): 116-124.   Abstract （2339）      PDF （2836KB）（1366）       Knowledge map    To obtain a low cost super large panel auto-stereoscopic display system, 3D monitor based on DLP was proposed. Optical transmission property of lenticular lens was analyzed. By simulating light path of lens, the figure of stereo viewing zones was obtained. With the crosstalk of stereo viewing zones, the parameters of lenticular lens suitable for large panel auto-stereoscopic display were deduced. For the best observing distance, the relationship between virtual cameras' distance and the scene limit positions was analyzed. An about 150-inch-large panel stereo display wall with enhanced three-dimensional effect and telepresence of the monitor at the same time was made. Related Articles | Metrics Select Automated derivation for analytical approximate solutions to nonlinear differential equations CHU Hong-mei;LIU Ying;LIU Yin-ping Journal of East China Normal University(Natural Sc    2010, 2010 (6): 125-136.   Abstract （2889）      PDF （697KB）（1588）       Knowledge map    Based on four kinds of Adomian polynomials algorithms proposed by R. C. Rach, a package NAPA was developed on Maple 12. The interface of NAPA is user-friendly. As long as one input a differential system with boundary or initial conditions, NAPA can entirely automatically output more accurate approximating solutions. Finally, two different type of examples were given to demonstrate the effectiveness of the package. Related Articles | Metrics Select Weighted graphs permitting no LEW-embeddings CAO Ni; LIU Ni; REN Han Journal of East China Normal University(Natural Sc    2010, 2010 (6): 137-141.   Abstract （2787）      PDF （291KB）（1310）       Knowledge map    This article studied the LEW (large edge width) embeddability of weighted grid graph G(a,b)(a≥2,b≥2) and the Mobius ladder graph Gn(n≥4) and showed that such two types of weighted graphs have no LEW-embeddings. Based on these two kinds of graphs weighted graphs were constructed which are strongly embedded in Sn and Nh and permit no LEW-embeddings in the same surface they embedded. Related Articles | Metrics Select Isomorphism of transformation graph GU Xiu-song;XU Dan-dan;SUN Zhi-ren;YAO Ze-qing Journal of East China Normal University(Natural Sc    2010, 2010 (6): 142-145,.   Abstract （2565）      PDF （296KB）（1293）       Knowledge map    By the method of degree sequence, It was shown that G--+ is isomorphic to Hn--+ if and only if G is isomorphic to Hn. It was also shown that for a grap G, when G is connected, then G--+ and Cn--+ are isomorphic if and only if G and Cn are isomorphic. Related Articles | Metrics Select Applications of axiomatic capital allocation and generalized weighted allocation HU Feng-xia;YAO Ding-jun Journal of East China Normal University(Natural Sc    2010, 2010 (6): 146-155.   Abstract （2647）      PDF （198KB）（1615）       Knowledge map    Applications of two kinds of capital allocation principles were studied: one was axiomatic allocation which had been known, and the other was generalized weighted allocation. Firstly, several known risk measures were listed. Based on a axiomatic method, allocation formulae with respect to these risk measures were given. Then in view of a specific numerical model, its allocation results were calculated. Secondly, generalized weighted allocation, which was an extension of weighted allocation, was considered. A method for comparing the amounts of generalized weighted capital allocations under two different aggregate losses, which stems from diversifying property, was mainly discussed. And some special examples were given. Related Articles | Metrics Select Multidimensional credibility models with random common effects ZHANG Yi; WEN Li-min; Journal of East China Normal University(Natural Sc    2010, 2010 (6): 156-168.   Abstract （2455）      PDF （218KB）（1567）       Knowledge map    Multidimensional credibility models with a random common effect were built, and the inhomogeneous and homogeneous credibility estimators were derived. Further, some properties of these estimators were presented. Analogy to the classical credibility theory, the multidimensional credibility estimators with the common effect can also be expressed as the weighted sum of individual mean, collective mean and collective premium, where these weights are so-called credibility factor matrices. Finally, a numerical example was given to show the calculations of multidimensional credibility estimators. Related Articles | Metrics Select Pricing basket future options in jump-diffusion models JIANG Ying;LIN Jian-zhong Journal of East China Normal University(Natural Sc    2010, 2010 (6): 169-177.   Abstract （2683）      PDF （303KB）（1567）       Knowledge map    A model of future market in which the prices of k futures are governed by a m-dimensional Brownian motion and a l-dimensional Poisson process is considered. Applying the forward martingale measure method, the Black-Scholes pricing formula for an European basket future option is obtained. Related Articles | Metrics Select Existence of positive periodic solution for a kind of predator-prey systems LIU Xing-bo;HE Liu-rong Journal of East China Normal University(Natural Sc    2010, 2010 (6): 178-185,.   Abstract （2470）      PDF （212KB）（1391）       Knowledge map    A non-autonomous predator--prey diffusive system of three species with delay was analyzed. By using Gaines and Mawhin's continuation theorem of coincidence degree theory, some sufficient conditions for the existence of positive periodic solution were established for the system. Related Articles | Metrics Select Hopf bifurcation analysis of a predator-prey system with delay and harvesting RAO Feng;WANG Wei-ming;LI Zhi-bin Journal of East China Normal University(Natural Sc    2010, 2010 (6): 186-198.   Abstract （2867）      PDF （252KB）（1593）       Knowledge map    In this paper, by using the analysis of qualitative method and bifurcation theory, we investigated the dynamics of the Monod-Haldane type predator-prey system with constant prey harvesting and a single time delay. It is shown that the Hopf bifurcation can occur as the delay τ crosses some critical values. Furthermore, the direction and stability of the Hopf bifurcation are determined by deriving normal form theory and center manifold theorem. Finally, numerical simulations are performed to illustrate the analytical results. Related Articles | Metrics